GLM 5.3
by Z.aiReasoningClean
Running live in a sandboxed frame. Click inside it before using the keyboard.
How it went
- Total time
- 9 min 18 s
- Cost
- $0.210
- Output tokens
- 58,295
- Spent thinking
- 47,763 tokens
- Speed
- 104.5 tok/s
- Console errors
- 0
- First token after
- 487 ms
- First visible text after
- 8 min 12 s
- Prompt tokens
- 493
- Code size
- 35.4 KB
- Finish reason
- stop
- Served by
- InferenceNet
- Model id
z-ai/glm-5.3- Reasoning sent
{"effort":"max"}- Max output
- 943,718 tokens
- Generated
- Nov 12, 2026
What it was asked
The prompt
Build an interactive Kanban board in vanilla HTML, CSS and JavaScript (no framework, no library). Requirements: - Three columns: "To do", "In progress", "Done", each showing its card count. - Pre-populate the board with 6 realistic cards spread across the columns so the first screenshot looks alive. - Each card has a title and a priority (low / medium / high) shown as a colored badge. - Add a card through a small modal form (title required), and delete a card with a button on it. - Drag and drop cards between columns with the mouse, with a clear visual drop indicator. - A search field that filters cards live by title. - A light / dark theme toggle. - State lives in memory only (no storage APIs).
System prompt, sent with every prompt
You are generating a self-contained web demo. It will be rendered automatically in a sandboxed iframe and compared side by side with the output of other AI models given the exact same task. Output rules: - Reply with exactly ONE fenced code block containing the complete file: ```html (or ```svg when the task asks for an SVG). No text before or after the code block. - Everything must be inline: CSS in <style>, JavaScript in <script>. No external files, images, fonts or network requests, except the CDN URLs explicitly allowed by the task. - Do not use localStorage, sessionStorage, cookies, IndexedDB, alert(), confirm(), prompt() or window.open(): they are blocked in the sandbox and will throw. - The page must look right in a 1280×800 viewport and adapt gracefully down to 375px wide. No horizontal scrollbar. - Something meaningful must be visible on first paint: a screenshot is taken automatically about 3 seconds after load, without any interaction. - Everything that makes the demo interesting must be visible within the first seconds: nothing hidden behind a high score, a later level or a long play session. - Games must start in a self-playing demo mode (a simple AI plays) behind a "Click or press a key to start" message, so the game can be judged in action without playing. - The iframe only receives keyboard events after the user clicks it: if the demo uses the keyboard, display a clear "Click or press a key to start" message. - The code must run with zero errors in the console of the latest Chrome.
Code run-1.html · 773 lines
<!DOCTYPE html>
<html lang="en" data-theme="light">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Index — a tiny kanban</title>
<style>
/* ============ theme tokens ============ */
:root{
--serif:"Iowan Old Style","Palatino Linotype","Book Antiqua",Palatino,Georgia,"Times New Roman",serif;
--mono:ui-monospace,"SF Mono","Cascadia Mono","Segoe UI Mono",Menlo,Consolas,monospace;
color-scheme:light;
--bg:#f2eee3;
--bg-dot:rgba(46,38,26,.075);
--ink:#221c12;
--ink-soft:rgba(34,28,18,.64);
--ink-faint:rgba(34,28,18,.45);
--line:rgba(34,28,18,.16);
--line-strong:rgba(34,28,18,.36);
--col-bg:#e9e4d4;
--card-bg:#faf7ee;
--accent:#bf3f16;
--accent-soft:rgba(191,63,22,.09);
--accent-contrast:#faf5ea;
--mark:rgba(238,184,54,.55);
--high:#b13a17;
--medium:#8a6512;
--low:#42704f;
--card-sh:0 1px 2px rgba(40,32,18,.08),0 3px 10px -6px rgba(40,32,18,.14);
--card-sh-hover:0 2px 4px rgba(40,32,18,.08),0 12px 24px -10px rgba(40,32,18,.28);
--overlay:rgba(30,24,14,.46);
--toast-bg:#221c12;
--toast-ink:#f2eee3;
--toast-link:#f0a183;
}
html[data-theme="dark"]{
color-scheme:dark;
--bg:#171410;
--bg-dot:rgba(242,238,227,.05);
--ink:#ece5d3;
--ink-soft:rgba(236,229,211,.64);
--ink-faint:rgba(236,229,211,.42);
--line:rgba(236,229,211,.15);
--line-strong:rgba(236,229,211,.36);
--col-bg:#1e1a14;
--card-bg:#28221a;
--accent:#e0642f;
--accent-soft:rgba(224,100,47,.12);
--accent-contrast:#1c130b;
--mark:rgba(224,178,60,.32);
--high:#ef8557;
--medium:#d3ab55;
--low:#7bab8a;
--card-sh:0 1px 2px rgba(0,0,0,.35),0 4px 12px -6px rgba(0,0,0,.4);
--card-sh-hover:0 2px 6px rgba(0,0,0,.4),0 14px 28px -12px rgba(0,0,0,.55);
--overlay:rgba(8,6,3,.58);
--toast-bg:#ece5d3;
--toast-ink:#221c12;
--toast-link:#b0431a;
}
/* smooth cross-fade for a moment after toggling theme */
html.theming *,html.theming *::before,html.theming *::after{
transition:background-color .35s ease,border-color .35s ease,color .35s ease,box-shadow .35s ease,fill .35s ease !important;
}
/* ============ base ============ */
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
min-height:100%;
font-family:var(--serif);
color:var(--ink);
background-color:var(--bg);
background-image:radial-gradient(circle,var(--bg-dot) 1px,transparent 1.4px);
background-size:24px 24px;
-webkit-font-smoothing:antialiased;
overflow-x:hidden;
}
::selection{background:var(--accent);color:var(--accent-contrast)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
button{font-family:inherit}
.app{max-width:1300px;margin:0 auto;padding:22px 26px 10px;display:flex;flex-direction:column;min-height:100vh}
/* ============ top bar ============ */
.topbar{display:flex;align-items:flex-end;justify-content:space-between;gap:18px;padding:4px 2px 20px;flex-wrap:wrap}
.brand{min-width:0}
.brand-name{margin:0;font:italic 400 34px/1 var(--serif);letter-spacing:.01em}
.brand-dot{color:var(--accent);font-style:normal}
.brand-sub{margin:8px 0 0;font:400 10.5px/1 var(--mono);letter-spacing:.18em;text-transform:uppercase;color:var(--ink-faint)}
.controls{display:flex;align-items:center;gap:10px;flex-wrap:wrap;justify-content:flex-end}
.search{display:flex;align-items:center;gap:8px;height:38px;padding:0 10px;background:var(--card-bg);border:1px solid var(--line);border-radius:9px;width:250px;max-width:100%;transition:border-color .15s,box-shadow .15s}
.search:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 15%,transparent)}
.search>svg{flex:none;width:14px;height:14px;color:var(--ink-faint)}
.search input{flex:1;min-width:0;border:0;outline:0;background:transparent;font:400 12px/1 var(--mono);letter-spacing:.02em;color:var(--ink)}
.search input::placeholder{color:var(--ink-faint)}
.search-clear{flex:none;display:flex;align-items:center;justify-content:center;width:20px;height:20px;padding:0;border:0;border-radius:5px;background:transparent;color:var(--ink-faint);cursor:pointer;opacity:0;pointer-events:none;transition:opacity .15s,color .15s,background .15s}
.search-clear svg{width:10px;height:10px}
.search.has-value .search-clear{opacity:1;pointer-events:auto}
.search-clear:hover{color:var(--ink);background:color-mix(in srgb,var(--ink) 8%,transparent)}
.icon-btn{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;padding:0;border:1px solid var(--line);border-radius:9px;background:transparent;color:var(--ink-soft);cursor:pointer;transition:color .15s,border-color .15s}
.icon-btn:hover{color:var(--ink);border-color:var(--line-strong)}
.icon-btn svg{width:15px;height:15px}
.icon-btn.spin svg{animation:spin .45s cubic-bezier(.3,.7,.3,1)}
@keyframes spin{to{transform:rotate(180deg)}}
html[data-theme="light"] .icon-sun{display:none}
html[data-theme="dark"] .icon-moon{display:none}
.btn{display:inline-flex;align-items:center;gap:8px;height:38px;padding:0 15px;border-radius:9px;border:1px solid transparent;font:700 10.5px/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;cursor:pointer;transition:background .15s,color .15s,border-color .15s,transform .1s}
.btn:active{transform:translateY(1px)}
.btn svg{width:12px;height:12px}
.btn-accent{background:var(--accent);color:var(--accent-contrast)}
.btn-accent:hover{background:color-mix(in srgb,var(--accent) 82%,#000)}
.btn-ghost{background:transparent;border-color:var(--line);color:var(--ink-soft)}
.btn-ghost:hover{border-color:var(--line-strong);color:var(--ink)}
/* ============ board & columns ============ */
.board{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;flex:1;align-items:stretch}
.column{display:flex;flex-direction:column;background:var(--col-bg);border:1px solid var(--line);border-top:3px solid var(--col-c);border-radius:12px;transition:background .15s,box-shadow .15s}
.column[data-col="todo"]{--col-c:#94886b}
.column[data-col="progress"]{--col-c:var(--accent)}
.column[data-col="done"]{--col-c:var(--low)}
html[data-theme="dark"] .column[data-col="todo"]{--col-c:#8a8069}
.column.over{outline:2px dashed var(--accent);outline-offset:-2px;background:color-mix(in srgb,var(--accent) 5%,var(--col-bg))}
.col-head{display:flex;align-items:center;gap:9px;padding:12px 12px 11px;border-bottom:1px solid var(--line)}
.col-name{margin:0;font:700 11px/1 var(--mono);letter-spacing:.18em;text-transform:uppercase;flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.col-count{min-width:24px;height:22px;padding:0 7px;display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--line);border-radius:7px;background:color-mix(in srgb,var(--ink) 5%,transparent);font:700 11.5px/1 var(--mono);color:var(--ink-soft)}
.col-count.pop{animation:pop .35s cubic-bezier(.34,1.56,.64,1)}
@keyframes pop{
0%{transform:scale(1)}
45%{transform:scale(1.28);background:color-mix(in srgb,var(--accent) 22%,transparent);border-color:color-mix(in srgb,var(--accent) 50%,transparent)}
100%{transform:scale(1)}
}
.col-add{flex:none;display:inline-flex;align-items:center;justify-content:center;width:22px;height:22px;padding:0;border:0;border-radius:6px;background:transparent;color:var(--ink-faint);cursor:pointer;transition:color .15s,background .15s}
.col-add:hover{color:var(--accent);background:var(--accent-soft)}
.col-add svg{width:12px;height:12px}
.col-list{flex:1;display:flex;flex-direction:column;gap:10px;padding:10px;min-height:130px}
.col-list.is-empty::after,.col-list.no-match::after{
content:"";display:flex;align-items:center;justify-content:center;flex:1;margin:2px;min-height:52px;
border:1.5px dashed var(--line);border-radius:9px;padding:14px 12px;
font:400 11px/1.5 var(--mono);letter-spacing:.05em;color:var(--ink-faint);text-align:center;
}
.col-list.is-empty::after{content:"No cards yet — drop one in"}
.col-list.no-match::after{content:"Nothing matches the filter here"}
.column.over .col-list::after{display:none}
/* ============ cards ============ */
.card{position:relative;background:var(--card-bg);border:1px solid var(--line);border-radius:9px;padding:11px 13px 10px;cursor:grab;box-shadow:var(--card-sh);user-select:none;-webkit-user-select:none;transition:transform .16s ease,box-shadow .16s ease,border-color .16s ease,opacity .16s ease}
.card:hover{transform:translateY(-2px);box-shadow:var(--card-sh-hover);border-color:var(--line-strong)}
.card:active{cursor:grabbing}
.card.drag-hidden{display:none}
.card.is-filtered{display:none}
.card-title{margin:0 22px 0 0;font:400 15.5px/1.4 var(--serif);letter-spacing:.005em;overflow-wrap:anywhere}
.card-meta{display:flex;align-items:center;gap:8px;margin-top:9px}
.card-no{margin-left:auto;font:400 9.5px/1 var(--mono);letter-spacing:.16em;color:var(--ink-faint)}
.card-del{position:absolute;top:7px;right:7px;width:22px;height:22px;display:flex;align-items:center;justify-content:center;padding:0;border:0;border-radius:6px;background:transparent;color:var(--ink-faint);cursor:pointer;opacity:.5;transition:opacity .15s,color .15s,background .15s}
.card:hover .card-del,.card-del:focus-visible{opacity:1}
.card-del:hover{color:var(--high);background:color-mix(in srgb,var(--high) 12%,transparent)}
.card-del svg{width:10px;height:10px}
.badge{display:inline-flex;align-items:center;gap:6px;padding:3.5px 8px 3px 9px;border-radius:999px;border:1px solid;font:700 9px/1 var(--mono);letter-spacing:.14em;text-transform:uppercase}
.badge-dot{width:5px;height:5px;border-radius:50%;background:currentColor;flex:none}
.badge-high{color:var(--high);border-color:color-mix(in srgb,var(--high) 42%,transparent);background:color-mix(in srgb,var(--high) 10%,transparent)}
.badge-medium{color:var(--medium);border-color:color-mix(in srgb,var(--medium) 42%,transparent);background:color-mix(in srgb,var(--medium) 10%,transparent)}
.badge-low{color:var(--low);border-color:color-mix(in srgb,var(--low) 42%,transparent);background:color-mix(in srgb,var(--low) 10%,transparent)}
mark{background:var(--mark);color:inherit;border-radius:2px;padding:0 1px}
/* drag ghost clone (custom drag image) */
.drag-image{position:fixed;left:-12000px;top:0;pointer-events:none;transform:rotate(2.2deg) scale(1.03);border-color:var(--line-strong);box-shadow:0 24px 48px -16px rgba(20,14,6,.5)}
/* drop placeholder — the insertion indicator */
.drop-phantom{flex:none;height:54px;border:1.5px dashed var(--accent);border-radius:9px;background:color-mix(in srgb,var(--accent) 7%,transparent);display:flex;align-items:center;justify-content:center;animation:phantom 1.1s ease-in-out infinite}
.drop-phantom::after{content:"drop here";font:700 9px/1 var(--mono);letter-spacing:.26em;text-transform:uppercase;color:var(--accent)}
@keyframes phantom{0%,100%{opacity:.55}50%{opacity:1}}
/* card motion */
.card.entering{animation:card-in .34s cubic-bezier(.22,.9,.32,1) backwards}
@keyframes card-in{from{opacity:0;transform:translateY(8px) scale(.97)}}
.card.landing{animation:land .3s cubic-bezier(.2,.8,.3,1.35) backwards}
@keyframes land{from{transform:scale(1.045)}}
.card.is-removing{animation:card-out .18s ease both;pointer-events:none}
@keyframes card-out{to{opacity:0;transform:scale(.9)}}
/* ============ footer ============ */
.foot{display:flex;flex-wrap:wrap;gap:6px 0;align-items:center;justify-content:center;padding:16px 2px 10px;font:400 10px/1.6 var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--ink-faint)}
.dot-sep{margin:0 9px;color:var(--line-strong)}
/* ============ modal ============ */
.overlay{position:fixed;inset:0;z-index:50;display:flex;align-items:center;justify-content:center;padding:18px;background:var(--overlay);-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);opacity:0;visibility:hidden;transition:opacity .18s ease,visibility 0s linear .18s}
.overlay.is-open{opacity:1;visibility:visible;transition:opacity .18s ease}
.modal{width:min(430px,100%);background:var(--card-bg);border:1px solid var(--line);border-radius:13px;box-shadow:0 30px 70px -18px rgba(10,7,2,.5);padding:20px 22px 18px;transform:translateY(10px) scale(.965);transition:transform .22s cubic-bezier(.2,.9,.3,1.15)}
.overlay.is-open .modal{transform:none}
.modal.shake{animation:shake .32s ease}
@keyframes shake{20%{transform:translateX(-6px)}40%{transform:translateX(5px)}60%{transform:translateX(-3px)}80%{transform:translateX(2px)}}
.modal-head{display:flex;align-items:center;gap:10px;margin-bottom:16px}
.modal-head h2{margin:0;font:italic 400 21px/1.1 var(--serif)}
.modal-x{margin-left:auto;width:28px;height:28px;display:flex;align-items:center;justify-content:center;padding:0;border:1px solid transparent;border-radius:7px;background:transparent;color:var(--ink-faint);cursor:pointer;transition:color .15s,background .15s}
.modal-x:hover{color:var(--ink);background:color-mix(in srgb,var(--ink) 7%,transparent)}
.modal-x svg{width:11px;height:11px}
.field{margin-bottom:15px}
.field-label{display:block;margin-bottom:7px;font:700 9.5px/1 var(--mono);letter-spacing:.16em;text-transform:uppercase;color:var(--ink-soft)}
.req{color:var(--high)}
.field-input{width:100%;background:transparent;border:0;border-bottom:2px solid var(--line);border-radius:0;padding:7px 1px 8px;font:400 16px/1.4 var(--serif);color:var(--ink);outline:none;transition:border-color .15s}
.field-input::placeholder{color:var(--ink-faint);font-style:italic}
.field-input:focus{border-color:var(--accent)}
.field-input.invalid{border-color:var(--high)}
.field-error{margin:7px 0 0;font:400 10.5px/1.4 var(--mono);letter-spacing:.04em;color:var(--high)}
.segmented{display:flex;border:1px solid var(--line);border-radius:9px;overflow:hidden;width:fit-content;max-width:100%}
.seg{appearance:none;-webkit-appearance:none;border:0;border-right:1px solid var(--line);background:transparent;padding:8px 13px 7px;font:700 9.5px/1 var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--ink-soft);cursor:pointer;white-space:nowrap;transition:background .15s,color .15s,box-shadow .15s}
.seg:last-child{border-right:0}
.seg:hover{background:color-mix(in srgb,var(--ink) 6%,transparent);color:var(--ink)}
.seg.is-on{color:var(--seg-c);background:color-mix(in srgb,var(--seg-c) 12%,transparent);box-shadow:inset 0 0 0 1.5px color-mix(in srgb,var(--seg-c) 60%,transparent)}
#colSeg .seg{--seg-c:var(--ink)}
#prioSeg .seg[data-val="low"]{--seg-c:var(--low)}
#prioSeg .seg[data-val="medium"]{--seg-c:var(--medium)}
#prioSeg .seg[data-val="high"]{--seg-c:var(--high)}
.modal-foot{display:flex;align-items:center;gap:10px;margin-top:20px}
.modal-hint{margin:0 auto 0 0;padding-right:10px;font:400 9.5px/1.5 var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--ink-faint)}
.modal-foot .btn{height:36px}
/* ============ toast ============ */
.toast{position:fixed;left:50%;bottom:24px;z-index:60;display:flex;align-items:center;gap:14px;padding:11px 12px 11px 16px;border-radius:10px;background:var(--toast-bg);color:var(--toast-ink);box-shadow:0 16px 40px -12px rgba(10,7,2,.45);font:400 12px/1.3 var(--mono);letter-spacing:.03em;max-width:min(92vw,520px);transform:translate(-50%,10px);opacity:0;pointer-events:none;transition:transform .22s ease,opacity .22s ease}
.toast.show{transform:translate(-50%,0);opacity:1;pointer-events:auto}
.toast-msg{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.toast-undo{flex:none;border:0;background:transparent;padding:5px 4px;font:700 10px/1 var(--mono);letter-spacing:.16em;text-transform:uppercase;color:var(--toast-link);cursor:pointer;border-bottom:1px solid currentColor}
.toast-undo:hover{filter:brightness(1.18)}
/* ============ responsive ============ */
@media (max-width:940px){
.board{grid-template-columns:minmax(0,1fr)}
.col-list{min-height:100px}
}
@media (max-width:640px){
.app{padding:16px 14px 8px}
.topbar{padding-bottom:14px}
.brand-name{font-size:28px}
.search{flex:1 1 auto;width:auto}
.modal-hint{display:none}
}
@media (prefers-reduced-motion:reduce){
*,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important}
}
</style>
</head>
<body>
<div class="app">
<header class="topbar">
<div class="brand">
<h1 class="brand-name">Index<span class="brand-dot">.</span></h1>
<p class="brand-sub">a tiny kanban for one busy human</p>
</div>
<div class="controls">
<div class="search" id="searchWrap">
<svg viewBox="0 0 16 16" fill="none" aria-hidden="true">
<circle cx="6.8" cy="6.8" r="4.8" stroke="currentColor" stroke-width="1.7"/>
<path d="M10.6 10.6l3.6 3.6" stroke="currentColor" stroke-width="1.7" stroke-linecap="round"/>
</svg>
<input id="searchInput" type="text" placeholder="Filter by title…" aria-label="Filter cards by title" autocomplete="off">
<button class="search-clear" id="searchClear" type="button" aria-label="Clear filter" title="Clear filter">
<svg viewBox="0 0 12 12" fill="none" aria-hidden="true"><path d="M2.5 2.5l7 7M9.5 2.5l-7 7" stroke="currentColor" stroke-width="1.6" stroke-linecap="round"/></svg>
</button>
</div>
<button class="icon-btn" id="themeBtn" type="button" aria-label="Switch to dark theme" title="Toggle light / dark">
<svg class="icon-moon" viewBox="0 0 24 24" fill="none" aria-hidden="true"><path d="M12 3a6 6 0 0 0 9 9 9 9 0 1 1-9-9Z" stroke="currentColor" stroke-width="2" stroke-linejoin="round"/></svg>
<svg class="icon-sun" viewBox="0 0 24 24" fill="none" aria-hidden="true"><circle cx="12" cy="12" r="4.2" stroke="currentColor" stroke-width="2"/><path d="M12 1.8v2.4M12 19.8v2.4M4.6 4.6l1.7 1.7M17.7 17.7l1.7 1.7M1.8 12h2.4M19.8 12h2.4M4.6 19.4l1.7-1.7M17.7 6.3l1.7-1.7" stroke="currentColor" stroke-width="2" stroke-linecap="round"/></svg>
</button>
<button class="btn btn-accent" id="addBtn" type="button">
<svg viewBox="0 0 14 14" fill="none" aria-hidden="true"><path d="M7 1.5v11M1.5 7h11" stroke="currentColor" stroke-width="1.8" stroke-linecap="round"/></svg>
<span>New card</span>
</button>
</div>
</header>
<main class="board" id="board">
<section class="column" data-col="todo">
<header class="col-head">
<h2 class="col-name">To do</h2>
<span class="col-count" data-count="todo" title="Cards in this column">3</span>
<button class="col-add" type="button" data-addcol="todo" aria-label="Add card to To do" title="Add card here">
<svg viewBox="0 0 12 12" fill="none" aria-hidden="true"><path d="M6 1.5v9M1.5 6h9" stroke="currentColor" stroke-width="1.7" stroke-linecap="round"/></svg>
</button>
</header>
<div class="col-list" data-list="todo"></div>
</section>
<section class="column" data-col="progress">
<header class="col-head">
<h2 class="col-name">In progress</h2>
<span class="col-count" data-count="progress" title="Cards in this column">2</span>
<button class="col-add" type="button" data-addcol="progress" aria-label="Add card to In progress" title="Add card here">
<svg viewBox="0 0 12 12" fill="none" aria-hidden="true"><path d="M6 1.5v9M1.5 6h9" stroke="currentColor" stroke-width="1.7" stroke-linecap="round"/></svg>
</button>
</header>
<div class="col-list" data-list="progress"></div>
</section>
<section class="column" data-col="done">
<header class="col-head">
<h2 class="col-name">Done</h2>
<span class="col-count" data-count="done" title="Cards in this column">1</span>
<button class="col-add" type="button" data-addcol="done" aria-label="Add card to Done" title="Add card here">
<svg viewBox="0 0 12 12" fill="none" aria-hidden="true"><path d="M6 1.5v9M1.5 6h9" stroke="currentColor" stroke-width="1.7" stroke-linecap="round"/></svg>
</button>
</header>
<div class="col-list" data-list="done"></div>
</section>
</main>
<footer class="foot">
<span>drag cards anywhere between columns</span><span class="dot-sep">·</span>
<span>× on a card deletes it</span><span class="dot-sep">·</span>
<span>nothing is saved — the board lives in memory</span>
</footer>
</div>
<!-- new card modal -->
<div class="overlay" id="overlay" aria-hidden="true">
<div class="modal" id="modal" role="dialog" aria-modal="true" aria-labelledby="modalTitle">
<div class="modal-head">
<h2 id="modalTitle">New card</h2>
<button class="modal-x" id="modalClose" type="button" aria-label="Close">
<svg viewBox="0 0 12 12" fill="none" aria-hidden="true"><path d="M2.2 2.2l7.6 7.6M9.8 2.2L2.2 9.8" stroke="currentColor" stroke-width="1.7" stroke-linecap="round"/></svg>
</button>
</div>
<form id="cardForm" novalidate>
<div class="field">
<label class="field-label" for="fTitle">Title <span class="req" aria-hidden="true">*</span></label>
<input class="field-input" id="fTitle" type="text" placeholder="e.g. Draft the changelog for v2.4" autocomplete="off" maxlength="90">
<p class="field-error" id="fTitleError" hidden>A card needs a title.</p>
</div>
<div class="field">
<span class="field-label" id="prioLabel">Priority</span>
<div class="segmented" id="prioSeg" role="group" aria-labelledby="prioLabel">
<button type="button" class="seg" data-val="low">Low</button>
<button type="button" class="seg is-on" data-val="medium">Medium</button>
<button type="button" class="seg" data-val="high">High</button>
</div>
</div>
<div class="field">
<span class="field-label" id="colLabel">Column</span>
<div class="segmented" id="colSeg" role="group" aria-labelledby="colLabel">
<button type="button" class="seg is-on" data-val="todo">To do</button>
<button type="button" class="seg" data-val="progress">In progress</button>
<button type="button" class="seg" data-val="done">Done</button>
</div>
</div>
<div class="modal-foot">
<p class="modal-hint">new cards land on top of the column</p>
<button type="button" class="btn btn-ghost" id="cancelBtn">Cancel</button>
<button type="submit" class="btn btn-accent">Add card</button>
</div>
</form>
</div>
</div>
<!-- delete toast with undo -->
<div class="toast" id="toast" role="status">
<span class="toast-msg" id="toastMsg"></span>
<button class="toast-undo" id="toastUndo" type="button">Undo</button>
</div>
<script>
(function(){
'use strict';
var root = document.documentElement;
function $(sel, ctx){ return (ctx || document).querySelector(sel); }
/* ---------------- state (memory only) ---------------- */
var colDefs = [
{ id:'todo', label:'To do' },
{ id:'progress', label:'In progress' },
{ id:'done', label:'Done' }
];
var colEl = {}, listEl = {}, countEl = {};
colDefs.forEach(function(c){
colEl[c.id] = $('.column[data-col="' + c.id + '"]');
listEl[c.id] = $('.col-list[data-list="' + c.id + '"]');
countEl[c.id] = $('.col-count[data-count="' + c.id + '"]');
});
var cards = new Map(); // id -> { id, no, title, priority }
var board = { todo:[], progress:[], done:[] };// ordered card ids per column
var seq = 0;
function addSeed(title, priority, col){
seq++;
var id = 'c' + seq;
cards.set(id, { id:id, no:seq, title:title, priority:priority });
board[col].push(id);
}
[
['Outline the Q3 product roadmap','high','todo'],
['Fix the layout shift on the pricing page','medium','todo'],
['Book a venue for the team offsite','low','todo'],
['Rebuild the onboarding email sequence','high','progress'],
['Refactor the date picker into a shared component','medium','progress'],
['Archive the 2019 marketing site','low','done']
].forEach(function(s){ addSeed(s[0], s[1], s[2]); });
/* ---------------- helpers ---------------- */
function esc(s){
return String(s).replace(/[&<>"']/g, function(ch){
return { '&':'&','<':'<','>':'>','"':'"',"'":''' }[ch];
});
}
function columnOf(id){
for (var i = 0; i < colDefs.length; i++)
if (board[colDefs[i].id].indexOf(id) !== -1) return colDefs[i].id;
return null;
}
function pop(el){
el.classList.remove('pop');
void el.offsetWidth;
el.classList.add('pop');
}
var query = '';
function qTrim(){ return query.trim().toLowerCase(); }
function highlight(title, q){
var t = esc(title);
if (!q) return t;
var pattern = esc(q).replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
return t.replace(new RegExp('(' + pattern + ')', 'gi'), '<mark>$1</mark>');
}
/* ---------------- rendering ---------------- */
function buildCard(card){
var el = document.createElement('article');
el.className = 'card';
el.draggable = true;
el.dataset.id = card.id;
el.innerHTML =
'<button class="card-del" type="button" aria-label="Delete card" title="Delete card">' +
'<svg viewBox="0 0 12 12" fill="none" aria-hidden="true"><path d="M2.2 2.2l7.6 7.6M9.8 2.2L2.2 9.8" stroke="currentColor" stroke-width="1.7" stroke-linecap="round"/></svg>' +
'</button>' +
'<h3 class="card-title"></h3>' +
'<div class="card-meta">' +
'<span class="badge badge-' + card.priority + '"><span class="badge-dot"></span>' + card.priority + '</span>' +
'<span class="card-no">Nº ' + String(card.no).padStart(2,'0') + '</span>' +
'</div>';
$('.card-title', el).textContent = card.title;
$('.card-del', el).addEventListener('click', function(){ removeCard(card.id); });
el.addEventListener('dragstart', onDragStart);
el.addEventListener('dragend', onDragEnd);
return el;
}
function animateIn(el, delay){
el.classList.add('entering');
if (delay) el.style.animationDelay = delay + 'ms';
setTimeout(function(){
el.classList.remove('entering');
el.style.animationDelay = '';
}, (delay || 0) + 450);
}
function renderAll(boot){
colDefs.forEach(function(c){
listEl[c.id].innerHTML = '';
board[c.id].forEach(function(id, i){
var el = buildCard(cards.get(id));
listEl[c.id].appendChild(el);
if (boot) animateIn(el, i * 55);
});
});
applyFilter();
}
function applyFilter(){
var q = qTrim();
document.querySelectorAll('.col-list .card').forEach(function(el){
var card = cards.get(el.dataset.id);
var visible = !q || card.title.toLowerCase().indexOf(q) !== -1;
el.classList.toggle('is-filtered', !visible);
$('.card-title', el).innerHTML = highlight(card.title, visible ? q : '');
});
updateCounts();
}
function updateCounts(){
var q = qTrim();
colDefs.forEach(function(c){
var total = board[c.id].length;
var visible = q
? board[c.id].filter(function(id){ return cards.get(id).title.toLowerCase().indexOf(q) !== -1; }).length
: total;
var text = q ? (visible + '/' + total) : String(total);
if (countEl[c.id].textContent !== text){
countEl[c.id].textContent = text;
pop(countEl[c.id]);
}
listEl[c.id].classList.toggle('is-empty', total === 0);
listEl[c.id].classList.toggle('no-match', total > 0 && visible === 0 && !!q);
});
}
/* ---------------- delete + undo ---------------- */
var lastDeleted = null;
function removeCard(id){
var col = columnOf(id);
if (!col) return;
var idx = board[col].indexOf(id);
board[col].splice(idx, 1);
lastDeleted = { id:id, col:col, idx:idx };
var el = document.querySelector('.card[data-id="' + id + '"]');
if (el){
el.classList.add('is-removing');
setTimeout(function(){ el.remove(); }, 200);
}
updateCounts();
var title = cards.get(id).title;
showToast('“' + (title.length > 30 ? title.slice(0,30) + '…' : title) + '” deleted');
}
function undoDelete(){
if (!lastDeleted) return;
var d = lastDeleted;
lastDeleted = null;
var at = Math.min(d.idx, board[d.col].length);
board[d.col].splice(at, 0, d.id);
hideToast();
var list = listEl[d.col];
var el = buildCard(cards.get(d.id));
list.insertBefore(el, list.children[at] || null);
animateIn(el, 0);
applyFilter();
}
/* ---------------- toast ---------------- */
var toast = $('#toast'), toastMsg = $('#toastMsg'), toastUndo = $('#toastUndo');
var toastTimer = null;
function showToast(msg){
toastMsg.textContent = msg;
toast.classList.add('show');
clearTimeout(toastTimer);
toastTimer = setTimeout(hideToast, 4200);
}
function hideToast(){
toast.classList.remove('show');
clearTimeout(toastTimer);
}
toastUndo.addEventListener('click', undoDelete);
/* ---------------- drag & drop ---------------- */
var dragEl = null, ghostEl = null;
var phantom = document.createElement('div');
phantom.className = 'drop-phantom';
function onDragStart(e){
if (e.target.closest && e.target.closest('.card-del')) { e.preventDefault(); return; } // don't drag from the ×
dragEl = e.currentTarget;
e.dataTransfer.effectAllowed = 'move';
try { e.dataTransfer.setData('text/plain', dragEl.dataset.id); } catch(err){}
// tilted "lifted card" as custom drag image
var rect = dragEl.getBoundingClientRect();
ghostEl = dragEl.cloneNode(true);
ghostEl.classList.add('drag-image');
ghostEl.classList.remove('entering','landing','is-removing');
ghostEl.style.width = rect.width + 'px';
document.body.appendChild(ghostEl);
try { e.dataTransfer.setDragImage(ghostEl, Math.round(rect.width / 2), 18); } catch(err){}
// hide the original after the snapshot is taken, put the phantom in its place
setTimeout(function(){ if (dragEl) dragEl.classList.add('drag-hidden'); }, 0);
dragEl.parentNode.insertBefore(phantom, dragEl);
}
function onDragEnd(){ finishDrag(); }
function finishDrag(){
if (dragEl){
dragEl.classList.remove('drag-hidden');
dragEl = null;
}
phantom.remove();
if (ghostEl){ ghostEl.remove(); ghostEl = null; }
colDefs.forEach(function(c){ colEl[c.id].classList.remove('over'); });
}
function afterElement(list, y){
var best = null, bestOff = -Infinity;
list.querySelectorAll('.card:not(.drag-hidden):not(.is-filtered)').forEach(function(el){
var box = el.getBoundingClientRect();
var off = y - box.top - box.height / 2;
if (off < 0 && off > bestOff){ bestOff = off; best = el; }
});
return best;
}
colDefs.forEach(function(c){
var col = colEl[c.id], list = listEl[c.id];
col.addEventListener('dragover', function(e){
if (!dragEl) return;
e.preventDefault();
if (e.dataTransfer) e.dataTransfer.dropEffect = 'move';
colDefs.forEach(function(x){ colEl[x.id].classList.toggle('over', x.id === c.id); });
var after = afterElement(list, e.clientY);
if (after) list.insertBefore(phantom, after);
else list.appendChild(phantom);
});
col.addEventListener('drop', function(e){
if (!dragEl) return;
e.preventDefault();
var dropped = dragEl;
if (phantom.parentNode === list) list.insertBefore(dropped, phantom);
else list.appendChild(dropped);
dropped.classList.remove('entering');
dropped.style.animationDelay = '';
dropped.classList.add('landing');
setTimeout(function(){ dropped.classList.remove('landing'); }, 350);
finishDrag();
syncFromDOM();
});
});
document.addEventListener('dragover', function(e){
var t = e.target;
if (dragEl && !(t && t.closest && t.closest('.column')))
colDefs.forEach(function(c){ colEl[c.id].classList.remove('over'); });
e.preventDefault();
});
document.addEventListener('drop', function(e){ e.preventDefault(); });
function syncFromDOM(){
colDefs.forEach(function(c){
board[c.id] = Array.prototype.map.call(
listEl[c.id].querySelectorAll('.card'),
function(el){ return el.dataset.id; }
);
});
updateCounts();
}
/* ---------------- search ---------------- */
var searchWrap = $('#searchWrap'), searchInput = $('#searchInput'), searchClear = $('#searchClear');
searchInput.addEventListener('input', function(){
query = searchInput.value;
searchWrap.classList.toggle('has-value', searchInput.value.length > 0);
applyFilter();
});
searchClear.addEventListener('click', function(){
searchInput.value = '';
query = '';
searchWrap.classList.remove('has-value');
applyFilter();
searchInput.focus();
});
/* ---------------- modal ---------------- */
var overlay = $('#overlay'), modal = $('#modal'), form = $('#cardForm');
var titleInput = $('#fTitle'), titleError = $('#fTitleError');
var prioSeg = $('#prioSeg'), colSeg = $('#colSeg');
var selPriority = 'medium', selColumn = 'todo', returnFocus = null;
function setSeg(container, val){
container.querySelectorAll('.seg').forEach(function(b){
b.classList.toggle('is-on', b.dataset.val === val);
});
}
function wireSeg(container, setter){
container.addEventListener('click', function(e){
var btn = e.target.closest('.seg');
if (!btn) return;
setSeg(container, btn.dataset.val);
setter(btn.dataset.val);
});
}
wireSeg(prioSeg, function(v){ selPriority = v; });
wireSeg(colSeg, function(v){ selColumn = v; });
function openModal(colId){
if (colId) selColumn = colId;
setSeg(colSeg, selColumn);
setSeg(prioSeg, selPriority);
titleInput.value = '';
titleInput.classList.remove('invalid');
titleError.hidden = true;
modal.classList.remove('shake');
overlay.classList.add('is-open');
overlay.setAttribute('aria-hidden','false');
setTimeout(function(){ titleInput.focus(); }, 50);
}
function closeModal(){
overlay.classList.remove('is-open');
overlay.setAttribute('aria-hidden','true');
if (returnFocus){ returnFocus.focus(); returnFocus = null; }
}
$('#addBtn').addEventListener('click', function(){
returnFocus = $('#addBtn');
openModal();
});
document.querySelectorAll('.col-add').forEach(function(btn){
btn.addEventListener('click', function(){
returnFocus = btn;
openModal(btn.dataset.addcol);
});
});
$('#modalClose').addEventListener('click', closeModal);
$('#cancelBtn').addEventListener('click', closeModal);
overlay.addEventListener('click', function(e){ if (e.target === overlay) closeModal(); });
document.addEventListener('keydown', function(e){
if (e.key === 'Escape' && overlay.classList.contains('is-open')) closeModal();
});
// keep Tab inside the modal while it's open
modal.addEventListener('keydown', function(e){
if (e.key !== 'Tab') return;
var items = Array.prototype.filter.call(
modal.querySelectorAll('button, input'),
function(el){ return el.offsetParent !== null; }
);
if (!items.length) return;
var first = items[0], last = items[items.length - 1];
if (e.shiftKey && document.activeElement === first){ e.preventDefault(); last.focus(); }
else if (!e.shiftKey && document.activeElement === last){ e.preventDefault(); first.focus(); }
});
form.addEventListener('submit', function(e){
e.preventDefault();
var title = titleInput.value.trim();
if (!title){
titleInput.classList.add('invalid');
titleError.hidden = false;
modal.classList.remove('shake'); void modal.offsetWidth; modal.classList.add('shake');
titleInput.focus();
return;
}
createCard(title, selPriority, selColumn);
closeModal();
});
titleInput.addEventListener('input', function(){
if (titleInput.classList.contains('invalid')){
titleInput.classList.remove('invalid');
titleError.hidden = true;
}
});
function createCard(title, priority, col){
seq++;
var id = 'c' + seq;
cards.set(id, { id:id, no:seq, title:title, priority:priority });
board[col].unshift(id);
var el = buildCard(cards.get(id));
listEl[col].insertBefore(el, listEl[col].firstChild);
animateIn(el, 0);
applyFilter();
}
/* ---------------- theme toggle ---------------- */
var themeBtn = $('#themeBtn');
themeBtn.addEventListener('click', function(){
var dark = root.dataset.theme === 'dark';
root.dataset.theme = dark ? 'light' : 'dark';
themeBtn.setAttribute('aria-label', dark ? 'Switch to dark theme' : 'Switch to light theme');
themeBtn.classList.remove('spin'); void themeBtn.offsetWidth; themeBtn.classList.add('spin');
root.classList.add('theming');
setTimeout(function(){ root.classList.remove('theming'); }, 420);
});
/* ---------------- boot ---------------- */
renderAll(true);
})();
</script>
</body>
</html>Reasoning trace (47,763 tokens)
Let me plan this Kanban board carefully.
Requirements:
1. Three columns: "To do", "In progress", "Done", each showing its card count.
2. 6 realistic pre-populated cards spread across columns.
3. Card: title + priority badge (low/medium/high) with distinct colors.
4. Add card via modal form (title required), delete button on each card.
5. Drag & drop between columns with clear visual drop indicator.
6. Live search filter by title.
7. Light/dark theme toggle.
8. State in memory only.
Also the demo must look good in a screenshot at 1280×800 within 3 seconds, adapt to 375px, no horizontal scroll, zero console errors.
Since it's not a game, the "demo mode" requirement about self-playing AI doesn't apply strictly — but the "click or press a key to start" applies mainly to games using keyboard. This is an app, so first paint should show the populated board. That's fine.
Let me think about design. I want to avoid the generic dashboard feel, avoid gradients, avoid default blue/purple, avoid emoji icons. I'll use a distinctive design language.
Design concept: A warm paper-like light theme with an ink-dark theme. Typography-led design. Let me pick a font — no external fonts allowed (no network requests beyond CDN allowed by the task; task says vanilla HTML/CSS/JS, no library — so no external font like Google Fonts? The rules say "No external files, images, fonts or network requests, except the CDN URLs explicitly allowed by the task." Task doesn't allow any CDN. So I must use system font stack. I can still craft a distinctive look with careful font stacks like ui-serif / Georgia for headings, or a monospace stack for accents.
Idea: Editorial "index card" aesthetic. Light theme: warm off-white paper (#f6f2ea or similar), ink black text, columns as subtle panels with a rule line. Priority badges as small pill/stamps with color coding: high = crimson/vermillion, medium = amber/ochre, low = sage/teal-green. Dark theme: deep charcoal/ink (#141311 warm dark), with cream text.
Avoid Tailwind default blue. Accent color: vermillion (#e04f2e / #d94f30) or a deep persimmon. That gives an editorial poster feel.
Structure:
- Header: app title (something like "Taskline" or "Board"), a serif italic maybe; search field; add button; theme toggle.
- Board: 3 columns. Each column header: name + count badge (count should update; also update when search filters? The count should probably show the card count — I'll show total count in column, and maybe filtered count. Requirement says "each showing its card count". I'll show total count. Maybe show "3" as a circled number. Could show both: `3` normally; when searching show `2/3`. That's a nice touch but keep simple: show total, and when filter active show visible/total.
- Cards: title, priority badge, delete button (appears on hover, but must be accessible — keep it visible but subtle). Cards have a drag handle? Native HTML5 drag and drop with draggable="true" on cards.
Drag and drop: Use HTML5 DnD API for mouse. "with a clear visual drop indicator" — when dragging over a column, highlight the column; show a placeholder line where the card will be inserted. I can implement insertion position by tracking dragover on cards and showing a thin insertion line before/after. Let me implement:
- dragstart on card: set dataTransfer, add class 'dragging' to card (opacity reduced or hide it? Keep it with reduced opacity, and use a placeholder element).
- Create a placeholder div (dashed outline / tinted block) that gets moved into position as you dragover cards/columns.
- On dragover column: compute afterElement via `getDragAfterElement` (common technique: compare mouse Y to midpoints of card elements excluding the dragged one).
- Move placeholder there.
- On drop: insert card at placeholder position, update state.
- dragleave/dragend cleanup.
Simpler robust approach: the classic "getDragAfterElement" from the well-known container pattern, but instead of inserting the actual dragging element live, insert the placeholder; on drop, insert the card at the placeholder's spot.
Actually I could insert the dragging card itself live into the DOM as you drag over (like many tutorials do). But that mutates state visually before drop; on dragend outside, need to restore. The placeholder approach is cleaner: keep the dragged element in place but visually marked (e.g., opacity .3 + dashed border, "lifted" ghost). Actually, the drag image is the default browser snapshot of the card. Let me set a custom drag image? Keep default.
Better approach: On dragstart, hide the original card (display:none) and show placeholder in its place — the drag image snapshot is taken before, so it still shows. Hmm, setting display:none immediately at dragstart sometimes makes the drag image empty in some browsers. Common fix: apply the hiding in a setTimeout(0). Let me do: on dragstart, setTimeout(() => card.classList.add('dragging-hidden'), 0) — drag image captured before timeout fires. Actually the drag image is captured synchronously at dragstart, so a timeout of 0 works in Chrome. Alternatively keep the card visible with reduced opacity. To be safe, I'll use the timeout+hide approach with a fallback: if something goes wrong, dragend restores. Chrome handles it fine.
Hmm, but there's risk. Alternative safer: keep card in place, add class "is-dragging" → opacity: 0.25, dashed outline. And a placeholder moves around showing insertion point. The original card stays in its column as a ghost until drop. That's clear enough. But then the ghost occupies space in the source column while placeholder is elsewhere — could be slightly confusing but acceptable and robust. Actually many boards (Trello) remove the card from origin and show placeholder. Let me do the hide-with-timeout approach; it's standard and works in Chrome. I'll test logic mentally:
```js
card.addEventListener('dragstart', e => {
dragged = card;
e.dataTransfer.effectAllowed = 'move';
e.dataTransfer.setData('text/plain', card.dataset.id);
card.classList.add('drag-ghost'); // slight transform, maybe
requestAnimationFrame(() => card.classList.add('drag-hidden'));
show placeholder at card position
});
```
Using rAF instead of setTimeout — also fires after drag image capture. I'll use setTimeout(…,0). Both fine.
On dragend: remove hidden class, remove placeholder, clear column highlight classes.
dragover handling on each column's card-list:
```js
list.addEventListener('dragover', e => {
e.preventDefault();
e.dataTransfer.dropEffect = 'move';
const after = getDragAfterElement(list, e.clientY);
if (after == null) list.appendChild(placeholder);
else list.insertBefore(placeholder, after);
});
```
getDragAfterElement excludes elements without class 'card' or the dragged/hidden one and the placeholder.
On drop (list.addEventListener('drop')): insert dragged card before placeholder, then cleanup, update state order, update counts.
Also allow dropping on the column area (not just list) — I'll put dragover on the column element but compute within list. Simpler: attach dragover to the column (which contains the list), and insert into list. Column highlight class when over.
Column highlight: `.column.over { outline / background tint / top border in accent }`. Placeholder: a block with dashed accent border, height ~ card height or fixed 44px, with subtle pulse. Clear indicator ✓.
State model:
```js
let state = {
columns: [
{ id:'todo', name:'To do', cardIds:[...] },
...
],
cards: { id: {title, priority, col? } }
}
```
Or simpler: `cards = [{id, title, priority, column}]` and column order derived from array order within each column: keep `order` per column via arrays. I'll store `board = { todo: [card, ...], progress: [...], done: [...] }` where card objects `{id, title, priority}` live in arrays. Rendering re-renders columns from state. On drop, I move DOM but then re-sync state from DOM (read card ids per column in order) and update counts. Easiest: after any mutation, call `syncFromDOM()` that reads the lists' card ids, then `renderCounts()`.
Search filter: input event → for each card element, toggle 'hidden' by matching title (case-insensitive). Update counts to show filtered/total. Keep it simple: count shows visible/total when filter active? Requirement: "each showing its card count". I'll make the count reflect matching cards, with the total in a subtle way. Hmm — to avoid ambiguity, I'll show the visible count normally; when a filter is active and hides some, show `visible/total`. Actually simplest and correct: count always shows the number of cards currently visible in that column; when searching, that changes live which is a nice effect. But requirement might want total card count. I'll show total count as the main number, and when filter active show "x of y" style. Let me do: badge shows visible count; if filter active and some hidden, show `v/t`. Or just always show total and update on add/delete/move. I think showing the live filtered count is more delightful and still "shows its card count". I'll do: count = number of cards whose title matches filter (i.e., visible). And add a small note? Keep it clean: a number chip. When searching, the number updates live — reviewers will see it responds to search. I'll show `visible` count and dim it? Hmm, but "each showing its card count" — I'll show total when no filter; when filter active show "visible / total" both. Let me implement:
```
countEl.textContent = filter ? `${visible}/${total}` : `${total}`;
```
That satisfies both interpretations.
Empty column after filter: show a muted "No matches" message; empty column without filter: "Drop cards here" / "Nothing here yet". Nice touch.
Modal: opened via "+ Add card" button. Also maybe each column header has a small "+" to add to that column — nice. Requirement says add through a modal form (title required). I'll have a global "Add card" button in header and per-column "+" buttons that preselect the column. Modal fields: title (required — HTML5 validation plus JS), priority select (segmented radio pills nicer), column select. Submit → create card in that column top, close modal. Escape closes; click on backdrop closes; focus management: focus title input on open, return focus.
Title required: prevent submit if empty; show inline error message "Title is required" and red border on the field. Since sandbox... fine, no alerts.
Priority selection UI: segmented control with three buttons Low/Medium/High, default Medium. Colored.
Delete: button on card (small ×). Click → remove with a quick exit animation. Maybe confirm? No confirm() allowed; just delete directly (state in memory only, fine). I'll delete instantly with a shrink animation. Add a subtle tooltip via title attribute.
Theme toggle: button with sun/moon icon (inline SVG, not emoji). Toggles `data-theme` on `<html>` or body. Light/dark via CSS custom properties. Default: respect `prefers-color-scheme`, defaulting light? For screenshot determinism, default light (paper) since it's the more distinctive look. I'll check prefers-color-scheme: dark → start dark, else light. Screenshot could be either; deterministic is nicer — I'll default to light always? The screenshot at 3s will show the light theme which I'll design to look great. I'll default light regardless of system, with toggle. Actually respecting prefers-color-scheme is good practice; but for the side-by-side comparison, a deterministic light theme shows my design intent. I'll go with light default always.
Toggle animation: small transition on colors; maybe a rotate on the icon.
Layout details:
Header (top bar):
- Left: wordmark: "KANBAN —" small caps? Something like a brand: "Ledger" or "Cardsheet"? Let me name it "Taskfold"? Keep generic-ish but styled: "The Board" ... Let me call it "Flowboard"? Many options. I'll go with "SORTIE"? Hmm. "Kardex"? I like "Ledger — a small kanban". Let me name it "Ticker"? Final: "Opus Board"? I'll use "PLANKE"? Overthinking. Use "Kanban" as the title with an index number, styled editorially: big serif "Kanban" plus small caption "task board · in-memory". Actually let me brand it "Driftboard"? Simple: title "Kanban" in serif italic, subtitle "personal task board". Good enough with strong typography.
Header right: search input (with magnifier SVG icon), theme toggle, "New card" button (accent, solid vermillion with cream text).
Board: CSS grid `grid-template-columns: repeat(3, 1fr)` with gap; on <900px, columns stack vertically (min-width 0). On narrow screens maybe columns become horizontal-scroll? Requirement: no horizontal scrollbar; stacking vertically is fine and each card full width. At 375px, header wraps: title on top, controls below.
Column style: light theme — column background slightly darker paper tone with 1px solid border (ink at low alpha), rounded 10px? Editorial style might use sharper corners — 8px radius is fine, or 2px for editorial crispness. Let me use a hybrid: soft 10px outer, cards 8px. Hmm, to avoid generic look: use squared corners (radius 2-3px) and 1.5px ink borders on cards, with a hard offset shadow? A subtle paper aesthetic: cards as index cards with a slight shadow and a top accent strip? Let me design:
Light theme:
- bg: #f4f1e9 (warm paper), body texture? Could add subtle noise via repeating-linear-gradient? Keep flat but with a faint dotted grid background: radial-gradient dots at low opacity — that's a pattern, not a decorative gradient; tasteful. I'll add a very subtle dot grid using radial-gradient(circle, rgba(0,0,0,.05) 1px, transparent 1px) with background-size 22px. Nice paper feel.
- ink: #1d1a16
- accent: #d4491f (vermillion/persimmon) or #c94f24.
- column bg: #eceadf or #efece2; border: 1px solid rgba(29,26,22,.14).
- card bg: #fffdf7 (near-white warm), border 1px solid rgba(29,26,22,.16), shadow 0 1px 2px rgba(29,26,22,.08). Hover: lift translate(-1px,-1px) with shadow 0 4px 10px.
- card left border? Priority shown as badge only.
Badges:
- high: vermillion bg tint + vermillion text: e.g., background rgba(212,73,31,.12), text #b23a17, border 1px solid rgba(212,73,31,.35).
- medium: ochre/amber: #9a6b1a text on rgba(156,110,26,.12).
- low: green sage: #3f6f4f on rgba(63,111,79,.12).
Badge style: uppercase 10px letterspaced, padding 2px 7px, radius 999px? Editorial: radius 3px. Pills are fine. I'll use radius 999 pills with dot: `● low`? No emoji — use CSS dot via ::before circle. Small colored dot + label text.
Dark theme:
- bg: #16140f (warm near-black), dots rgba(255,255,255,.05).
- ink/text: #ece7db.
- column bg: #1d1a15, border rgba(236,231,219,.12).
- card bg: #241f18? maybe #262117, border rgba(236,231,219,.14).
- accent same vermillion, maybe brighter #e05a2b.
- Adjust badge colors for dark: text brighter, tints on dark.
Transitions on theme change: `transition: background-color .3s, color .3s, border-color .3s` on relevant elements — careful, that can be heavy but fine.
Typography:
- Headings: Georgia / 'Iowan Old Style' serif stack: `"Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif`.
- Body/UI: system sans but not default-looking... system-ui is what I typically avoid as identity font, but with no external fonts, I can use serif for identity (headings, card titles) and a clean sans/mono for meta. Editorial move: card titles in serif at 15-16px; labels/meta in a monospace stack (ui-monospace, "SF Mono", Menlo, Consolas) uppercase letterspaced — gives a "typewriter/index card" vibe. That's distinctive. Let me do:
- Wordmark: serif italic big.
- Column titles: monospace uppercase letterspaced small + count in a serif numeral? Column header: name in mono caps 11px ls 0.12em; count as a small square chip with serif number.
- Card title: serif 16px, line-height 1.3.
- Badge: mono 10px uppercase.
- Buttons: mono uppercase 11px.
That gives a cohesive "print shop" aesthetic.
Header layout:
```
[ Kanban / task board ] [search........] [theme] [+ New card]
```
Wordmark: maybe "Tasks —" hmm. Let me name the app "Correspondence"? No. "Sortiment"? I'll go with "Index." Actually a kanban named "Index" is cute (index cards). Wordmark: `Index` in serif italic + a small mono caption "a kanban for one". Hmm, or "Ledger". I'll pick **"Index"** — matches index-card cards. Subtitle: "personal kanban · three columns, zero clutter"? Keep it: "a tiny kanban for getting things done".
Also a bottom hint bar? Maybe a small footer line: mono tiny: "Drag cards between columns · state lives in memory". Nice, communicates features. Put it in header under wordmark or footer. I'll add a slim footer with drag hint — helps the reviewer know interactions. Or put hint text under the header. I'll include a subtle line in header sub.
Column header design:
```
TO DO [3] [+]
——————————————— (rule line)
```
Column name mono caps + count chip (serif number in a bordered square) + a small plus button to add card directly in that column. Count chip: 20x20 border 1px, mono/serif number. When count changes, do a tiny pop animation (scale). Nice detail.
Cards:
```
| title (serif) [×] <- delete btn appears on hover, top-right
| ● HIGH (badge) + id/# tag?
```
Maybe add card meta like a tiny reference number "№ 01" in mono — gives editorial flavor. Cards could show creation index like "Nº 4". Cute. I'll add a mono micro-label with "Nº 04" plus priority badge at bottom. And delete button top-right.
Card hover: cursor grab; while dragging cursor grabbing.
Delete button: appears on hover/focus (opacity 0 → 1). On touch devices no hover... For 375px, maybe always show at reduced opacity. I'll make it always visible but subtle (low contrast), brightening on hover. Safer for demo screenshot too (requirement: "delete a card with a button on it" — should be visible in screenshot). Yes: always visible, small, top-right, "×" via SVG or the multiplication sign character. Using text "×" is fine (not an emoji). I'll use an inline SVG cross for crispness. Or just a character styled. Character is simpler: `<button class="card-del" aria-label="Delete card">×</button>`. The × character renders fine.
Actually for icons (search magnifier, sun/moon, plus), I'll use inline SVGs — crisp and professional.
Drag visuals:
- `.card.drag-origin`: when dragging starts, hide original (display none) — but keep in DOM so dragend works. Actually display:none elements: dragend still fires on them? The dragend fires on the source element even if hidden — yes, it should still fire. But some browsers have quirks. Alternative: keep it visible with class 'lifted-away' (opacity .35, dashed border, scale .98). I'll go with the timeout-hide; known to work in Chrome. Let me double check: In Chrome, `setTimeout(()=>el.style.display='none',0)` at dragstart keeps the drag image. Yes, widely used pattern.
Hmm, but there's a subtlety: with the original hidden and placeholder shown, when drop occurs I insert original before placeholder and unhide. If drop happens outside any column (dragend without drop), I restore: unhide original, remove placeholder. Fine.
Also need `dragenter`/`dragleave` for column highlight: dragover sets class, but dragleave fires when moving between children. Common approach: on dragover add class to the column containing the list; use a counter or check relatedTarget. Simplest robust: on each column's `dragover`, add 'over' to it and remove 'over' from all others (since dragover fires continuously). On `drop` and `dragend`, clear all. dragleave might flicker; using dragover-driven highlight avoids flicker entirely. But when leaving the board entirely, no dragover fires to remove highlight... Actually dragover keeps firing on the last hovered element? No — when you leave the browser or hover over non-column area, dragover fires on that other element. If hovering over the page background (not a column), no handler clears the highlight. I'll add a dragover handler on the board/document that clears 'over' from columns not under the pointer — but dragover on board fires also when over columns (bubbling) — I can clear in the board handler and let column handler re-add (column handler runs first since target deeper... bubble order: column handler fires first (target phase), then board handler; if board handler clears, it'd wipe it). Use event order: attach board dragover listener in capture? Simpler: in column dragover, add class; in board dragover, if e.target's closest('.column') is null, clear all. Bubbling: column's handler already added class; board handler runs after, checks closest — if over a column it's non-null, no clearing. If over non-column area, clears.
Also `dragend` cleanup always runs (fires on source). Good.
Drop indicator: placeholder element `.drop-phantom`:
```css
.drop-phantom {
height: 46px;
border: 1.5px dashed var(--accent);
background: color-mix(in srgb, var(--accent) 8%, transparent);
border-radius: 8px;
margin: ...same as card gap;
}
```
Maybe with a small label "drop here"? Could contain tiny mono text "drop". A pulsing animation (opacity .7↔1). Keep height adaptive? Fixed 44-56px fine.
Plus column 'over' state: background tint + accent top border (inset box-shadow 0 2px 0 accent at top?) or outline: 1.5px dashed accent? Column highlight: `outline: 1.5px solid var(--accent); outline-offset: -1.5px;` plus slight bg tint. Good clear indicator.
Keyboard accessibility extra: could allow moving cards with buttons? Not required. Skip, but maybe add keyboard: focusable cards with Enter? Not required — keep scope tight but polished.
Add flow:
- Header "New card" button + column "+" buttons open modal with target column preselected.
- Modal: overlay (rgba ink .45 + backdrop blur small), panel: paper bg, border, radius, shadow, max-width 420px.
- Contents: mono uppercase label "New card"; Title input (serif large text 18px, bordered underline style — editorial input: transparent bg, bottom border 2px ink); Column segmented radios; Priority segmented radios; footer: Cancel (ghost) + Add card (accent).
- Validation: on submit, if title empty → input gets error style, show inline message "Give the card a title." Shake animation maybe.
- Escape key closes; backdrop click closes; focus title on open; on close, refocus the trigger button.
Toast on delete? Nice touch: small toast "Card deleted" bottom with Undo button? Undo adds complexity but is impressive. "State in memory" — undo stack: keep lastDeleted {card, column, index}; toast with "Undo" restores within timeout. That's a nice touch and not too hard. But risk of bugs; keep it simple but do implement undo — it's contained: store deleted card + position; clicking Undo reinserts into state and re-renders; toast auto-dismisses after 4s. I'll implement carefully.
Actually, managing state: I'll keep state as the single source and re-render columns on each mutation. Rendering approach: full re-render of each column's list innerHTML from state arrays; but drag-and-drop manipulates DOM directly... If I re-render after drop (to sync state), that's fine — after drop I sync state from DOM then optionally re-render. Simplest: after drop, read DOM order into state, update counts, done (no full re-render needed since DOM is already correct). For add/delete/undo: mutate state + re-render that column's list (or all lists). Full re-render is simplest: `renderAll()`.
But careful: re-render must preserve search filter application. `renderAll()` applies filter to each card as it creates them.
Card ids: incrementing counter; data-id attributes.
Delete animation: adding class 'removing' (scale down + height collapse) then remove after animation; but with state re-render approach, I can: animate the element, on animationend remove from state and re-render. Or remove from state immediately and re-render with the card marked? Simpler: animate then update state+render. During the 220ms animation the state still contains the card — fine.
Add animation: newly added card gets class 'entering' → keyframe fade/slide in.
Count pop: when count text changes, re-trigger 'pop' animation via class toggle + reflow.
Now let me think about the counts: "each showing its card count". Show chip with number. When filtered: `${visible}/${total}`. When visible==0 and filter: show "0/3". OK.
Empty column states: if total==0: show ghost message "No cards yet — drop one here"; if filter hides all: "Nothing matches “query”". Style: dashed border box, mono text, muted.
Search input: header field with magnifier icon, placeholder "Filter by title…", width ~200px, focus ring accent. Live filtering on input event. Also show a clear "×" button inside when non-empty? Nice but optional; I'll add small clear button appearing when there's text. Keep it simple: include it — CSS shows when input has value? Can't easily do via CSS without :has... Modern Chrome supports `:has`. Use `.search:has(input:not(:placeholder-shown)) .clear { display:block }`. Fine (latest Chrome). Or JS toggles class. I'll just toggle via JS to be safe.
Also: highlight matched substring? Nice touch: wrap matched part in <mark>. Editorial: mark with accent underline / yellow highlight. In light theme, a soft yellow highlight (#ffe9a3); dark theme adjusted. I'll implement highlight of matches in card titles. Careful with HTML escaping — I must escape titles when rendering (user input). I'll escape then apply highlight by regex on escaped text (matching on plain text, then escape parts separately). Implementation: build with textContent for title? Then highlight requires splitting. Do: `highlightMatch(title, query)` → returns HTML string with escaped segments and <mark>. Escape each segment then join. Safe.
Search matching: case-insensitive substring; also diacritics? Keep simple.
Drag from a column while search filter active: dragging hidden/filtered cards — filtered-out cards have display:none so they don't interfere with getDragAfterElement (offsetParent checks / getBoundingClientRect returns 0s — my getDragAfterElement uses offset logic; display:none elements have no boxes, I'll filter to '.card:not(.filtered-out)' anyway).
Now the layout responsiveness:
- ≥1000px: header row: brand left, controls right. Board: 3 columns grid.
- 700–1000: keep 3 columns but narrower; cards fine.
- <700: header wraps (flex-wrap), board becomes 1 column stack; columns min-height smaller. No horizontal scroll.
Font sizes: card title 15.5px serif; column labels 11px mono; badge 10px mono.
Now dark theme toggle icon: sun/moon SVG swap with rotation. Button: bordered square 36px with icon; hover invert.
Let me write the actual code.
HTML skeleton:
```html
<!DOCTYPE html>
<html lang="en" data-theme="light">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Index — a tiny kanban</title>
<style>...</style>
</head>
<body>
<div class="app">
<header class="topbar">
<div class="brand">
<h1 class="brand-name">Index<span class="brand-dot">.</span></h1>
<p class="brand-sub">a tiny kanban board — everything lives in memory</p>
</div>
<div class="controls">
<div class="search" id="search">
<svg ...></svg>
<input id="searchInput" type="text" placeholder="Filter by title…" autocomplete="off">
<button class="search-clear" id="searchClear" aria-label="Clear search">×</button>
</div>
<button class="icon-btn" id="themeToggle" aria-label="Toggle theme">
sun svg / moon svg
</button>
<button class="btn-accent" id="addBtn"> + svg New card</button>
</div>
</header>
<main class="board" id="board">
<!-- columns rendered by JS? or static HTML with JS-filled lists -->
</main>
<footer class="foot">hint text</footer>
</div>
<!-- modal -->
<div class="overlay" id="overlay" hidden>
<div class="modal" role="dialog" aria-modal="true" aria-labelledby="modalTitle">
...
</div>
</div>
<div class="toast" id="toast" ...>
```
Columns: static HTML for structure (better first-paint semantics), lists filled by JS from state. Column count element static, updated by JS.
I'll write static columns in HTML:
```html
<section class="column" data-col="todo">
<header class="col-head">
<h2 class="col-name">To do</h2>
<span class="col-count" data-count>0</span>
<button class="col-add" data-addcol="todo" aria-label="Add card to To do">+svg</button>
</header>
<div class="col-rule"></div>
<div class="col-list" data-list="todo"></div>
</section>
```
State:
```js
const COLUMNS = [
{id:'todo', label:'To do'},
{id:'progress', label:'In progress'},
{id:'done', label:'Done'},
];
let board = { todo:[...], progress:[...], done:[...] };
```
Seed cards (6 realistic, spread): e.g. todo: 3, progress: 2, done: 1. Realistic titles like "Rewrite onboarding email sequence", "Audit accessibility of checkout flow", "Draft Q3 roadmap summary"; progress: "Refactor date picker into shared component", "Migrate images to next-gen formats"; done: "Ship dark mode for settings page". Priorities varied: high/medium/low.
Priorities labels: LOW / MED / HIGH? Show full: "Low", "Medium", "High" in mono caps 10px — with dot.
Rendering a card:
```js
function cardEl(card){
const el = document.createElement('article');
el.className = 'card';
el.draggable = true;
el.dataset.id = card.id;
el.innerHTML = `
<button class="card-del" aria-label="Delete card">×</button>
<h3 class="card-title"></h3>
<div class="card-meta">
<span class="badge badge-${card.priority}"><i class="dot"></i>${card.priority}</span>
<span class="card-no">Nº ${String(card.no).padStart(2,'0')}</span>
</div>`;
el.querySelector('.card-title').innerHTML = highlight(card.title);
// delete listener
}
```
Nº character — fine, not emoji (U+00BA masculine ordinal indicator). Actually "Nº" is standard for numero. Good editorial touch.
Wait — delete button placement: absolutely positioned top-right. Title next to it with padding-right.
Card CSS:
```css
.card {
position:relative;
background: var(--card);
border:1px solid var(--card-border);
border-radius:8px;
padding:12px 14px 10px;
box-shadow: 0 1px 2px rgba(...);
cursor:grab;
transition: transform .15s, box-shadow .15s, border-color .15s, opacity .2s;
}
.card:hover { transform: translateY(-1px); box-shadow: 0 6px 14px -6px ...; }
.card:active { cursor:grabbing; }
```
Hmm transform on hover + dragging may conflict with drag ghost? Fine.
Also selection: user-select none on cards to make dragging nicer? Titles maybe selectable... For DnD niceness, `user-select:none` on cards. But search highlight? fine.
DnD code:
```js
let dragged = null; // card element
let phantom = document.createElement('div');
phantom.className = 'drop-phantom';
function getDragAfterElement(container, y){
const els = [...container.querySelectorAll('.card:not(.drag-hidden)')];
return els.reduce((closest, el)=>{
const box = el.getBoundingClientRect();
const offset = y - box.top - box.height/2;
if (offset < 0 && offset > closest.offset) return {offset, el};
return closest;
}, {offset:-Infinity}).el;
}
```
Wait, with dragged card hidden (display:none), it's excluded anyway; the `:not(.drag-hidden)` extra safety. Also filtered-out cards display:none excluded naturally, but add `.card:not(.is-filtered)` to be safe. display:none elements have zero rects, so offset = y - 0 - 0 = y > 0 → won't be chosen (need offset<0). Safe even without filter. OK.
Column lists dragover:
```js
document.querySelectorAll('.col-list').forEach(list=>{
const col = list.closest('.column');
list.addEventListener('dragover', e=>{
e.preventDefault();
if(!dragged) return;
e.dataTransfer.dropEffect='move';
highlight(col);
const after = getDragAfterElement(list, e.clientY);
if(after) list.insertBefore(phantom, after);
else list.appendChild(phantom);
});
list.addEventListener('drop', e=>{
e.preventDefault();
if(!dragged) return;
list.insertBefore(dragged, phantom);
finishDrag();
});
});
```
Hmm: drop target should also accept drops when list is empty (list has min-height to be a target). Give `.col-list` min-height like 80px (or flex-grow so column fills). Columns equal height: board grid with `align-items:start` or stretch? Stretch columns to equal height looks tidy: `.board{align-items:stretch}` and `.column{display:flex;flex-direction:column}` `.col-list{flex:1}`. With equal-height columns the empty space is droppable.
But drop only fires if dragover preventDefault happened on that element — dragover on list or column children. The list covers the column area (flex:1). Card children inside list: dragover bubbles to list. Good.
finishDrag():
```js
function finishDrag(){
clearHighlight();
if(dragged){
dragged.classList.remove('drag-hidden');
}
phantom.remove();
dragged = null;
syncFromDOM();
}
```
Wait order: insert dragged before phantom, then remove phantom and unhide. In drop handler: `list.insertBefore(dragged, phantom)` then finishDrag removes phantom & unhides, syncs state from DOM (read each list's .card ids in order into board arrays), update counts, apply filter to moved card? The dragged card's filter state: it was visible (being dragged means visible). syncFromDOM then applyFilter() to be consistent.
dragend (on card at creation):
```js
el.addEventListener('dragstart', e=>{
dragged = el;
e.dataTransfer.effectAllowed='move';
e.dataTransfer.setData('text/plain', el.dataset.id);
el.classList.add('drag-hidden'); // via timeout
// place phantom where the card was
el.parentNode.insertBefore(phantom, el);
});
el.addEventListener('dragend', ()=>{ finishDrag(); });
```
For the hide: `setTimeout(()=>el.classList.add('drag-hidden'),0)`. Phantom placed immediately at card's position. drag-hidden: `display:none`. Then during dragover, phantom moves. On drop, card inserted at phantom's position. On dragend without drop: card is still in original position in DOM (hidden) — finishDrag unhides it there, phantom removed. State unchanged.
Edge: drop fires then dragend fires — finishDrag runs twice; second run: dragged still set? finishDrag sets dragged=null, so dragend handler calls finishDrag with dragged null — make finishDrag idempotent: guard.
Also dragover on `.column` (not just list) for safety? The list fills column; header isn't covered. Dropping on header — minor; I'll attach dragover to the column element instead, but insert into its list:
```js
column.addEventListener('dragover', ...)
```
and compute `list = column.querySelector('.col-list')`. That covers the whole column area including header. I'll do that.
highlight(col): remove 'over' from all columns, add to col. Board-level dragover clearing: attach to document? `document.addEventListener('dragover', e=>{ if(!dragged) return; if(!e.target.closest('.column')) clearHighlight(); })` — document dragover fires with target = deepest element under pointer; if outside columns, clears. That runs after column handler (bubble). Good.
Also `dragleave` on document to clear when leaving window? dragend covers it (drag cancels or completes outside). Fine.
syncFromDOM:
```js
function syncFromDOM(){
COLUMNS.forEach(c=>{
const list = getList(c.id);
board[c.id] = [...list.querySelectorAll('.card')].map(el=> cardById(el.dataset.id));
});
updateCounts();
}
```
cardById from a Map id→card object. I'll maintain `cards` map. Or store card objects in board arrays only and find via find(). Map cleaner: `const cards = new Map()`; board arrays store ids only? Then state = { order per column: [ids] }. Let me restructure:
```js
let seq = 0;
const cards = new Map(); // id -> {id, no, title, priority}
let board = { todo:[/*ids*/], progress:[], done:[] };
```
Render list from ids. syncFromDOM reads ids. addCard: id, push to front of column (unshift — new card appears on top; Trello adds to bottom; top is more visible, I'll unshift). Delete: remove id from array + cards map, keep for undo.
Undo toast: on delete, save {id, card, col, index}; show toast "“title” deleted — Undo". Undo: re-insert card into map and board[col] at index, re-render, hide toast. Toast times out 4.5s. Multiple deletes: only last undo-able; acceptable.
Rendering:
```js
function renderAll(){
COLUMNS.forEach(c=>{
const list = getList(c.id);
list.innerHTML='';
board[c.id].forEach(id=>{
const el = buildCard(cards.get(id));
list.appendChild(el);
});
// empty state handled in updateCounts/filter
});
applyFilter();
updateCounts();
}
```
applyFilter:
```js
let query = '';
function applyFilter(){
const q = query.trim().toLowerCase();
document.querySelectorAll('.card').forEach(el=>{
const card = cards.get(el.dataset.id);
const match = !q || card.title.toLowerCase().includes(q);
el.classList.toggle('is-filtered', !match);
el.querySelector('.card-title').innerHTML = highlight(card.title, q);
});
updateCounts();
}
```
.is-filtered { display:none }.
updateCounts:
```js
COLUMNS.forEach(c=>{
const total = board[c.id].length;
const visible = board[c.id].filter(id=>isVisible(cards.get(id))).length;
const el = countEls[c.id];
const text = query.trim() ? `${visible}/${total}` : `${total}`;
if(el.textContent !== text){ el.textContent = text; el.classList.remove('pop'); void el.offsetWidth; el.classList.add('pop'); }
// empty states
const list = getList(c.id);
list.classList.toggle('is-empty', total===0);
list.classList.toggle('is-empty-filtered', total>0 && visible===0 && query.trim());
// remove old empty msg if list has cards
});
```
Empty state message: rather than a DOM child inside the list (which would interfere with getDragAfterElement / insertBefore phantom), use CSS pseudo-element on `.col-list.is-empty::after { content: "..." }`! Pseudo elements aren't elements — no interference with drag logic. Brilliant: `.col-list:empty::after`? But list contains cards even when filtered... `.col-list.is-empty::after` with content from data attribute? Content text differs for "no cards" vs "no matches". Use two classes with different content, or a data-attribute message set via CSS `content: attr(data-empty)`. Set `list.dataset.empty = msg`.
Wait — but :empty pseudo won't work since filtered cards remain as children. Use classes:
```css
.col-list.is-empty::after, .col-list.is-empty-filtered::after {
content: attr(data-emptymsg);
display:flex; ... styled dashed box ...
}
```
Set data-emptymsg from JS. Good.
Column empty list min-height so it's droppable: `.col-list{min-height:120px}` — with flex:1 within stretch column it fills anyway; add min-height for safety when board align-items:start? Use stretch. OK.
Now the modal.
```html
<div class="overlay" id="overlay" hidden>
<div class="modal" role="dialog" aria-modal="true" aria-labelledby="mTitle">
<header class="modal-head">
<h2 id="mTitle">New card</h2>
<button class="icon-btn" id="modalClose" aria-label="Close">×</button>
</header>
<form id="cardForm" novalidate>
<label class="field-label" for="fTitle">Title <span class="req">*</span></label>
<input id="fTitle" class="field-input" type="text" placeholder="e.g. Sketch the new pricing page" maxlength="80">
<p class="field-error" id="titleError" hidden>Give the card a title first.</p>
<div class="field-group">
<span class="field-label">Priority</span>
<div class="segmented" id="prioSeg">
<button type="button" class="seg seg-low" data-val="low">Low</button>
<button type="button" class="seg seg-medium is-on" data-val="medium">Medium</button>
<button type="button" class="seg seg-high" data-val="high">High</button>
</div>
</div>
<div class="field-group">
<span class="field-label">Column</span>
<div class="segmented" id="colSeg">
<button type="button" class="seg" data-val="todo">To do</button>
<button type="button" class="seg" data-val="progress">In progress</button>
<button type="button" class="seg" data-val="done">Done</button>
</div>
</div>
<footer class="modal-foot">
<button type="button" class="btn-ghost" id="cancelBtn">Cancel</button>
<button type="submit" class="btn-accent">Add card</button>
</footer>
</form>
</div>
</div>
```
Segmented controls: buttons toggling 'is-on', storing current value in dataset of container. Style like connected pill group with border; selected gets accent-ish fill per priority color or ink fill. For priority segmented, selected state could take the badge color of that priority — nice cohesion. For column segmented, selected = ink fill with paper text.
Title input style: serif 17px, background transparent, border-bottom 2px solid var(--ink-30), focus border accent; error state border crimson + shake.
Validation: submit handler: `if(!titleInput.value.trim())` → show error (hidden=false), input class 'invalid', shake, focus, return. Else create card, close, renderAll with new card 'entering' animation. Track `lastAddedId` to animate: after render, `document.querySelector(`[data-id="${id}"]`).classList.add('entering')` and scroll into view? Column list may not scroll; fine.
Close modal: function closeModal() { overlay.hidden = true; overlay.classList.remove('show'); ... restore focus }. Animate: overlay uses class 'show' with transitions; when opening remove hidden then rAF add show; when closing remove show, after transitionend add hidden. Keep it simpler: use `hidden` + animation keyframes on open (modal pop). For close, just hide immediately or with quick fade via transition + setTimeout 150. I'll implement small helper with class 'is-open' and no `hidden` attr but `display:none` default toggled by class... Transition needs display change handling; simplest robust: overlay always in DOM, `visibility:hidden; opacity:0; pointer-events:none` default; `.is-open` makes visible with transition. No hidden attribute; use aria-hidden or inert? Fine to just use visibility. Escape key listener when open. Backdrop click: overlay click where target === overlay closes.
Focus trap light: on open focus title input; Tab cycling not fully trapped — acceptable, but I can add simple trap: keydown Tab within modal keeps focus inside. Nice-to-have; implement quick trap.
Theme toggle:
```js
const root = document.documentElement;
function setTheme(t){ root.dataset.theme = t; themeBtn... swap icons }
```
Icons: two SVGs inside button, CSS shows one based on `html[data-theme='dark']` — elegant: `html[data-theme="light"] .icon-moon{display:block}` etc. Toggle rotates icon slightly.
Transition on theme switch: add class to html 'theming' with `* {transition: background-color .35s ease, border-color .35s ease, color .35s ease}`? Applying transitions to everything permanently might interfere with card hover transitions (they'd get slow color transitions). I'll add `html.theming *` rule: on toggle, add class, remove after 400ms. Also maybe a fun flourish: theme toggle with a rotating sun/moon icon is enough.
Search clear button: shows when query non-empty; clears and refocuses input.
Footer hint: "Drag cards between columns · click a card’s × to delete · everything lives in memory, refreshing resets the board". Mono small muted.
Fonts stack details:
```css
--serif: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Palatino, Georgia, serif;
--mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;
```
Colors light:
```
--bg: #f3efe6;
--bg-dot: rgba(31,26,20,.06);
--ink: #211c15;
--ink-soft: rgba(33,28,21,.62);
--ink-faint: rgba(33,28,21,.38);
--line: rgba(33,28,21,.16);
--col-bg: #ebe6d9; (slightly deeper paper)
--card-bg: #fbf8f1; hmm near white warm
--accent: #c8451c; (burnt vermillion)
--accent-ink: #fff… for button text: #fdf9f0
--shadow: rgba(33,28,21,.14)
--high: #b93a1b; --medium: #8a6414; --low: #3e6b4f;
--mark: #f6df6f? highlight: background rgba(246,197,66,.45)
```
Check contrast: accent #c8451c on paper — good.
Dark:
```
--bg: #171410;
--bg-dot: rgba(240,234,220,.05);
--ink: #ece5d4;
--ink-soft: rgba(236,229,212,.6);
--ink-faint: rgba(236,229,212,.34);
--line: rgba(236,229,212,.14);
--col-bg: #1e1a14;
--card-bg: #262019; → maybe #272119
--accent: #e0602e; brighter for dark
--high: #ff8a5e? Badge colors on dark: high text #f2835f bg rgba(224,96,46,.15) border rgba(...,.4); medium #d9b04a-ish #d6ad4f; low #7fb08e.
--mark: rgba(246,197,66,.35)
```
Badges:
```css
.badge{display:inline-flex;align-items:center;gap:6px;font:600 10px/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;padding:4px 8px 3px;border-radius:999px;border:1px solid;}
.badge .dot{width:6px;height:6px;border-radius:50%;background:currentColor;}
.badge-high{color:var(--high); border-color: color-mix(in srgb, var(--high) 45%, transparent); background: color-mix(in srgb, var(--high) 10%, transparent);}
```
color-mix supported in latest Chrome — yes. But to be safe I could precompute rgba values... color-mix is fine in current Chrome. I'll use it moderately (also for phantom). Alternatively define per-theme badge colors explicitly. I'll use color-mix; latest Chrome supports widely.
Header buttons:
- `.btn-accent`: background var(--accent), color #fbf6ec (light) — in dark, accent bg with dark text? #1a120c? Let's compute: accent #e0602e with near-black text looks good; but keep one text color that works both: use `--accent-contrast: #fdf8ee` in light, `#1b120b` in dark. Fine.
Plus icon inside button: inline SVG plus.
Search styling: bordered pill? Editorial: a rectangle with 1px line, bg card color, radius 8px, with SVG icon left, width 210px; focus: border accent + subtle shadow ring.
Wordmark: "Index." serif italic 28px, tight. Subtitle mono 11px letterspaced muted. Maybe add a tiny rotated stamp-like element? Could add a small "EST. TODAY" nah. Keep brand block clean; maybe brand-name has the accent period: "Index<span style accent>.</span>".
Board grid: `grid-template-columns:repeat(3,minmax(0,1fr)); gap:14px;` page padding: 22-28px sides, max-width 1280 centered? Full width is fine; maybe max-width 1240 for large screens. I'll do `.app{max-width:1280px;margin:0 auto;padding:20px 24px 8px;}`.
Card delete button: absolute top right, 20x20, border-radius 6, color ink-faint, hover: bg crimson tint color crimson border. Always visible but faint; brightens on card hover.
Card number: "Nº 04" mono 10px ink-faint.
Also I might add a subtle timestamp or assignee? Requirement says title + priority only; keep it with Nº for flavor.
Entering animation:
```css
@keyframes card-in { from {opacity:0; transform: translateY(-6px) scale(.98);} to{...} }
.card.entering{ animation: card-in .25s ease both; }
```
Removing:
```css
@keyframes card-out { to { opacity:0; transform: scale(.92); max-height:0; padding-top:0; padding-bottom:0; margin-bottom?; } }
```
Animating max-height needs a starting value... use keyframe from current to 0: with max-height animating from a fixed large value? Simpler: animate opacity+scale quickly (180ms) then remove. Slight jump in layout — acceptable. Or wrap cards? Keep simple: fade+scale, then state update re-renders.
Toast:
```css
.toast{position:fixed;left:50%;bottom:22px;transform:translate(-50%,8px);opacity:0;transition:.25s;pointer-events:none;}
.toast.show{transform:translate(-50%,0);opacity:1;pointer-events:auto;}
```
Content: message + Undo button. bg ink, text paper (inverted), radius 8, shadow. Border-left accent? Inverted ink bar with mono text.
Now, code size — let me write it all out carefully and double-check every function name and reference. I'll write clean, commented code.
Extra flourish idea to make it memorable ("signature moment"): When you drop a card, the target column's count chip does a little stamp animation, and the card lands with a settle animation (scale bounce). Also when a card lands in "Done", maybe a tiny strike-through flourish? A nice one: cards in Done column get a subtle "✓" state — like the column tints or the card gets a small check marker. Could style done cards slightly differently: reduced opacity title? Might conflict with search highlight. Small check icon next to Nº in Done column — I'll add: in Done column, card shows a small check SVG in meta instead of/in addition to Nº. Simple: if column is done, meta shows a "done" tag. Implement: buildCard(card, colId). On render we know column. Add `<span class="card-done">done</span>`? Hmm. Keep the Nº and add colored left border for done cards? Simple and tasteful: done cards get `--card` slightly tinted green? I'll skip fancy per-column card styling except: done cards' titles get a subtle ink-faint color? No — keep uniform; instead I'll do the drop-settle animation + count stamp, which reads as delightful.
Actually a "signature moment" idea: the drop phantom with a live "DROP" mono label pulsing, plus the column edge indicator with accent. Also maybe dragging card rotates slightly (the native drag image is a snapshot — can't animate). Custom drag image: `e.dataTransfer.setDragImage(el, offsetX, offsetY)` — could create a cloned styled element (rotated 2deg, big shadow) as the drag image! Nice: create a ghost clone positioned off-screen, setDragImage(ghost, w/2, 20), remove after dragend. This makes dragging feel premium. Chrome supports setDragImage with off-screen element (must be rendered, not display:none). Position fixed at left:-9999px... setDragImage with elements outside viewport: Chrome captures it correctly even off-screen as long as it's rendered. There are known quirks but generally works if element is in DOM and displayed (can be positioned off-screen). Risk: some browsers show empty. Fallback: if setDragImage not supported, skip. I'll implement with try/catch. If the ghost fails, native snapshot of hidden?? Wait — the original card gets hidden via timeout AFTER dragstart, and drag image is captured at dragstart... if setDragImage is called at dragstart with our clone, that's the image used. If it fails, native uses snapshot of the card (before hide timeout). Either way OK.
Hmm, but caution: setDragImage in Chrome with element at negative coordinates — I recall it works. Let me do it:
```js
const ghost = el.cloneNode(true);
ghost.className = 'card drag-ghost-img';
ghost.style.width = el.offsetWidth+'px';
ghost.style.position='fixed';
ghost.style.left='-9999px'; ghost.style.top='0';
document.body.appendChild(ghost);
e.dataTransfer.setDragImage(ghost, 40, 20);
// remove on dragend
```
drag-ghost-img: transform: rotate(2.5deg) scale(1.02); box-shadow big; border accent. I'll store ghostEl and remove in finishDrag.
Wait, actually clone of the card contains the delete button etc. — fine.
One more consideration: `draggable` attributes + text selection: set `user-select:none` on cards to avoid drag conflicts.
Also clicking delete button inside a draggable card: click works fine.
Touch devices: HTML5 DnD doesn't work on touch. The requirement says "with the mouse" — fine. But add note? Not needed.
Now, dragover on columns also needs to consider that when dragging over the phantom itself, the phantom is an element inside the list — getDragAfterElement only selects '.card' elements so phantom is skipped. Good.
Insertion algorithm details:
```js
function getDragAfterElement(list, y){
const cards = [...list.querySelectorAll('.card:not(.drag-hidden)')];
let closest=null, closestOffset=-Infinity;
for(const el of cards){
const box = el.getBoundingClientRect();
const offset = y - box.top - box.height/2;
if(offset < 0 && offset > closestOffset){ closestOffset=offset; closest=el; }
}
return closest;
}
```
Wait: `.drag-hidden` uses display:none, so those have no box anyway; also the dragged card is hidden so it's excluded. But at dragstart, before timeout fires, drag-hidden isn't applied yet — but no dragover happens before timeout (needs mouse move). Fine.
Column highlight:
```css
.column.over{ background: color-mix(in srgb, var(--accent) 5%, var(--col-bg)); outline:1.5px dashed var(--accent); outline-offset:-1.5px; }
```
Dashed outline vs solid: dashed reads as "drop zone". Also column header rule could turn accent. Fine with outline.
Phantom:
```css
.drop-phantom{
height:52px;
border:1.5px dashed var(--accent);
border-radius:8px;
background: color-mix(in srgb, var(--accent) 7%, transparent);
display:flex;align-items:center;justify-content:center;
margin:0 2px; /* align with card gutters? cards have no margin, list has padding */
animation: phantom-pulse 1s ease-in-out infinite;
}
.drop-phantom::after{content:'drop here';font:600 10px var(--mono);letter-spacing:.18em;text-transform:uppercase;color:var(--accent);}
@keyframes phantom-pulse{0%,100%{opacity:.55}50%{opacity:1}}
```
Cards spacing: `.col-list{display:flex;flex-direction:column;gap:10px;padding:10px;}` — phantom is a flex child, gap applies.
Lists padding: 10px; cards inside. Column radius 10px.
Column header:
```css
.col-head{display:flex;align-items:center;gap:8px;padding:12px 12px 10px;}
.col-name{font:600 11px var(--mono);letter-spacing:.16em;text-transform:uppercase;color:var(--ink-soft);margin:0;flex:1;}
```
Actually name should be stronger: ink full. Use color ink, weight 700.
Count chip:
```css
.col-count{min-width:22px;height:22px;padding:0 6px;display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--line);border-radius:6px;font:700 12px var(--mono);color:var(--ink);background:color-mix(in srgb, var(--ink) 5%, transparent);}
.col-count.pop{animation:pop .3s cubic-bezier(.34,1.56,.64,1);}
@keyframes pop{0%{transform:scale(1)}40%{transform:scale(1.25)}100%{transform:scale(1)}}
```
col-add button: 22x22 icon button with plus svg, faint, hover accent.
Rule under header: `border-bottom:1px solid var(--line)` on header or a separate div with a double line? Editorial: 1px line + column bg difference is enough. Maybe header sits on a slightly different strip: `background: color-mix(in srgb, var(--ink) 3%, var(--col-bg))`. Subtle.
Board top: maybe columns also have a colored top rule per column? e.g., To do = ink, In progress = accent, Done = green? That could aid scanning and indicates drop targets. Tasteful: 2px top border per column: todo → var(--ink-faint)? Hmm might look like unnecessary colored accents. I'll give each column a 3px top border in distinct muted tones: todo: #9a927e (stone), progress: var(--accent), done: var(--low-green). This is functional color (status coding), not random decoration. I think it's tasteful and helps. Actually it echoes priorities though... could confuse. Alternative: all columns same top border (ink), with the count chip carrying status. Let me use subtle per-column top borders — it genuinely aids scanning. Keep them muted/desaturated. I'll do it: `--col-accent: #8b8471 / #c8451c / #3e6b4f` in light; dark: `#7a7466 / #e0602e / #6d9c7d`.
Footer: mono 10.5px, faint, padding 14px 4px 6px; content: "drag cards between columns · × deletes · nothing is saved — refresh resets the board". Add separator dots via CSS or just middot characters "·" (fine, punctuation not emoji).
Modal styling:
```css
.overlay{position:fixed;inset:0;background:rgba(20,16,10,.5);display:flex;align-items:flex-start? center;justify-content:center;padding:20px;z-index:50;opacity:0;visibility:hidden;transition:opacity .2s, visibility .2s; backdrop-filter: blur(3px);}
.overlay.is-open{opacity:1;visibility:visible;}
.modal{width:min(440px,100%);background:var(--card-bg);border:1px solid var(--line);border-radius:12px;box-shadow:0 24px 60px -20px rgba(0,0,0,.4);padding:20px 22px 18px;transform:translateY(8px) scale(.97);transition:transform .22s cubic-bezier(.2,.9,.3,1.2);}
.overlay.is-open .modal{transform:none;}
```
Backdrop-filter blur — fine, subtle, purposeful (focus), not gradient.
Field input:
```css
.field-input{width:100%;background:transparent;border:0;border-bottom:2px solid var(--line);font:15.5px/1.45 var(--serif);color:var(--ink);padding:8px 2px;outline:none;border-radius:0;transition:border-color .15s;}
.field-input:focus{border-color:var(--accent);}
.field-input.invalid{border-color:var(--high);}
.field-error{font:11px var(--mono);color:var(--high);margin:6px 0 0;letter-spacing:.04em;}
@keyframes shake{...}
.modal.shake{animation:shake .3s;}
```
Segmented:
```css
.segmented{display:flex;border:1px solid var(--line);border-radius:8px;overflow:hidden;width:max-content? or fit;}
.seg{appearance:none;background:transparent;border:0;border-right:1px solid var(--line);padding:7px 12px 6px;font:600 10.5px var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--ink-soft);cursor:pointer;transition:background .15s,color .15s;}
.seg:last-child{border-right:0;}
.seg:hover{background:color-mix(in srgb, var(--ink) 6%, transparent);}
.seg.is-on{background:var(--ink);color:var(--bg);}
/* priority selected colors */
#prioSeg .seg.is-on[data-val="low"]{background:color-mix(in srgb, var(--low) 18%, var(--card-bg)); color:var(--low); box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--low) 50%, transparent);}
```
Hmm, that's a bit much. Simplify: priority selected = badge color background solid with white/ink text? Solid colored segments might look loud. Tinted bg + colored text + colored inset ring is tasteful. Let me define helper: each seg has data-val; CSS:
```css
#prioSeg .seg.is-on{color:var(--seg-c);background:color-mix(in srgb, var(--seg-c) 12%, transparent);box-shadow:inset 0 0 0 1px color-mix(in srgb, var(--seg-c) 55%, transparent);}
#prioSeg .seg[data-val="low"]{--seg-c:var(--low);}
#prioSeg .seg[data-val="medium"]{--seg-c:var(--medium);}
#prioSeg .seg[data-val="high"]{--seg-c:var(--high);}
```
Clean with CSS vars. Column segmented: `--seg-c: var(--ink)`.
Buttons:
```css
.btn{...mono uppercase 11px, padding 9px 14px, radius 8px, border 1px solid transparent}
.btn-accent{background:var(--accent);color:var(--accent-contrast);box-shadow:0 1px 0 rgba(0,0,0,.15)? }
.btn-accent:hover{background:color-mix(in srgb, var(--accent) 88%, black);}
.btn-ghost{background:transparent;border-color:var(--line);color:var(--ink-soft);}
.btn-ghost:hover{border-color:var(--ink-faint);color:var(--ink);}
```
Icon button (theme):
```css
.icon-btn{width:36px;height:36px;display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--line);border-radius:8px;background:transparent;color:var(--ink-soft);cursor:pointer;}
.icon-btn:hover{color:var(--ink);border-color:var(--ink-faint);}
.icon-btn svg{width:16px;height:16px;}
html[data-theme="light"] .icon-sun{display:none} /* show moon in light (click → dark) */
```
Convention: show the icon of what you'll switch TO, or current state? Common: show moon in light mode ("switch to dark"). I'll show moon in light, sun in dark. Add rotation transition on toggle: `.icon-btn svg{transition:transform .4s}` and on toggle add class 'spin' briefly. Simple approach: keyframe spin once each toggle: `themeBtn.classList.remove('spin'); void offsetWidth; add('spin')` with `@keyframes spin{to{transform:rotate(-180deg)? from 0}`. I'll do rotate 180 each time.
Search:
```css
.search{display:flex;align-items:center;gap:8px;border:1px solid var(--line);background:var(--card-bg);border-radius:8px;padding:0 10px;height:36px;width:230px;transition:border-color,box-shadow;}
.search:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb, var(--accent) 15%, transparent);}
.search input{flex:1;border:0;background:transparent;outline:0;font:13px var(--sans? mono?);color:var(--ink);min-width:0;}
.search svg{width:14px;height:14px;color:var(--ink-faint);flex:none;}
.search-clear{...opacity 0 pointer-events none; .search.has-value & visible}
```
Search input font: mono 12px? Mono suits the meta aesthetic. Use mono 12px letterspacing .02em. Placeholder "Filter by title…".
Sans stack for any body text? Almost everything is serif or mono — that's the identity. Good.
Now topbar layout:
```css
.topbar{display:flex;align-items:flex-end? center;justify-content:space-between;gap:16px;padding:6px 2px 18px;flex-wrap:wrap;}
.controls{display:flex;gap:10px;align-items:center;flex-wrap:wrap;}
```
Brand:
```css
.brand-name{font:italic 400 30px/1 var(--serif);letter-spacing:-.01em;margin:0;color:var(--ink);}
.brand-name em?
.brand-sub{font:11px var(--mono);letter-spacing:.08em;color:var(--ink-faint);margin:5px 0 0;}
```
Responsive:
```css
@media (max-width: 860px){
.board{grid-template-columns:1fr;}
.column{min-height: 0;}
.topbar{align-items:center;}
.search{width:100%;order:? }
}
```
At small widths, controls wrap; search flex:1. Board single column: columns stack; lists min-height smaller (70px).
Also 2-column intermediate? `@media (max-width:1020px) and (min-width:861px){ grid-template-columns:1fr 1fr; }` — 3 columns wrap with third below spanning? `repeat(auto-fit,minmax(300px,1fr))` gives 2 then 1. With auto-fit the third spans one column, leaving a gap. Use `repeat(auto-fit, minmax(290px, 1fr))` — at 1280 inside max-width 1232 minus gaps: 3×~395 fine; at 900: 2 columns (third below at left) — acceptable. Or force 3 columns ≥861 and 1 below. Auto-fit is fine and graceful.
Hmm, equal-height stretch with auto-fit: OK.
One more detail: prevent default dragover on document to avoid browser opening dropped text when missed? The drop handler on columns handles preventDefault; drops elsewhere on page would navigate? For text/plain drops outside handled targets, the browser does nothing harmful (may try to search dragged text?). Safer: `document.addEventListener('dragover', e=> e.preventDefault()); document.addEventListener('drop', e=>{ if(!e.defaultPrevented) e.preventDefault(); })`. But careful: preventDefault on document dragover sets dropEffect for entire page — it makes whole page a valid drop target which keeps dropEffect 'move'... That's fine; drop outside columns just gets swallowed. But our column drop handler also calls preventDefault — order: column listener (target) then document listener — both run; fine.
Wait: if document dragover preventDefault is called, dropping over a column — does the column's drop still fire? Yes, drop fires on the deepest element with listeners; we handle it. And document-level drop would also fire (bubbling) — but I want to swallow only unhandled ones. In the document drop handler, our column handler ran first and already moved the card; document handler just preventDefaults — harmless. But careful that finishDrag isn't called twice — document drop handler won't call it. OK.
Now the theme meta: also set `color-scheme` property so form controls (scrollbars) match: `html[data-theme=dark]{color-scheme:dark}`.
Selection color: `::selection{background:var(--accent);color:var(--accent-contrast)}` nice touch.
Focus visible styles: `:focus-visible{outline:2px solid var(--accent);outline-offset:2px}` for buttons — ensure cards draggable aren't focusable (no tabindex) — fine.
Scrolling: page may scroll vertically if content tall — fine, no horizontal scroll requirement only. Ensure `overflow-x:hidden` on body as safety.
Let me also double check "something meaningful visible on first paint within 3 seconds" — all static + JS render at DOMContentLoaded; instant.
Now write the seed data:
To do:
1. "Outline the Q3 product roadmap" — high
2. "Fix layout shift on the pricing page" — medium? realistic mix
3. "Interview 3 candidates for the design lead role" — low
In progress:
4. "Rebuild onboarding email sequence" — high
5. "Refactor the date picker into a shared component" — medium
Done:
6. "Ship dark mode for account settings" — high? priorities: low for done? A done card with high priority is fine. Let me vary: done: "Ship dark mode for account settings" — medium? and maybe done card with low? Only 6 cards: todo 3 (high, medium, low), progress 2 (high, medium), done 1 (low? high?). To show all three badge colors prominently, ensure each appears at least twice if possible: high×2, medium×2, low×2. done gets... let me put low in done ("Archive the old marketing site" low). Then todo: high, medium, high? Hmm: todo: high("Outline Q3 roadmap"), medium("Fix layout shift on pricing page"), low("Book team offsite venue"); progress: high("Rebuild onboarding email sequence"), medium("Refactor date picker component"); done: high("Ship dark mode for settings")? Then high×3, low×2, medium×2 = 7. Six cards: high×2, medium×2, low×2:
- todo: "Outline the Q3 product roadmap" (high), "Fix layout shift on the pricing page" (medium), "Book a venue for the team offsite" (low)
- progress: "Rebuild the onboarding email sequence" (high), "Refactor the date picker into a shared component" (medium)
- done: "Ship dark mode for account settings" (low)? Dark mode shipping as low priority is odd; but done priorities matter less. Alternatively swap: make done "Archive the 2019 marketing site" (low). Realistic ✓. Use that.
Card Nº: sequential 01..06 by creation order.
Wait — realistic spread "so the first screenshot looks alive": 3/2/1 spread ✓.
Now, careful implementation details for correctness:
`buildCard(card)`:
```js
function buildCard(card){
const el = document.createElement('article');
el.className = 'card';
el.draggable = true;
el.dataset.id = card.id;
el.setAttribute('role','listitem')? // list role
el.innerHTML = `
<button class="card-del" type="button" aria-label="Delete card: ${esc(card.title)}" title="Delete card">
<svg viewBox="0 0 12 12" width="12" height="12" aria-hidden="true"><path d="M2 2l8 8M10 2l-8 8" stroke="currentColor" stroke-width="1.6" stroke-linecap="round"/></svg>
</button>
<h3 class="card-title"></h3>
<div class="card-meta">
<span class="badge badge-${card.priority}"><span class="badge-dot"></span>${card.priority}</span>
<span class="card-no">Nº ${pad(card.no)}</span>
</div>`;
el.querySelector('.card-title').innerHTML = highlight(card.title, currentQuery());
el.querySelector('.card-del').addEventListener('click', ()=> deleteCard(card.id));
el.addEventListener('dragstart', onDragStart);
el.addEventListener('dragend', onDragEnd);
return el;
}
```
esc for attribute — need escaping function for `"`,`<`,`&`. Write esc().
highlight(title, q):
```js
function esc(s){return s.replace(/[&<>"']/g, c=>({'&':'&','<':'<','>':'>','"':'"',"'":'''}[c]));}
function highlight(title, q){
const t = esc(title);
if(!q) return t;
const escapedQ = esc(q).replace(/[.*+?^${}()|[\]\\]/g,'\\$&');
return t.replace(new RegExp(`(${escapedQ})`,'gi'), '<mark>$1</mark>');
}
```
Hmm — subtlety: q escaped then title escaped — matching escaped strings. If q contains "&", title has "&" and q escaped "&" — match works. Special chars in q like "<" → "<" matches title's "<". But regex-escape the escaped q. Edge: case-insensitive replace on escaped text is fine. Minor edge: overlapping escapes — acceptable for a demo.
But careful: query used for match test should be raw lowercase includes. highlight used only when match true. When no match, card hidden anyway.
Search input handler:
```js
searchInput.addEventListener('input', ()=>{
query = searchInput.value;
searchWrap.classList.toggle('has-value', !!searchInput.value);
applyFilter();
});
```
applyFilter:
```js
function applyFilter(){
const q = query.trim().toLowerCase();
document.querySelectorAll('.col-list .card').forEach(el=>{
const card = cards.get(el.dataset.id);
const match = !q || card.title.toLowerCase().includes(q);
el.classList.toggle('is-filtered', !match);
el.querySelector('.card-title').innerHTML = highlight(card.title, match ? q : '');
});
updateCounts();
}
```
updateCounts:
```js
function updateCounts(){
const q = query.trim();
COLUMNS.forEach(c=>{
const ids = board[c.id];
const total = ids.length;
let visible = total;
if(q){
visible = ids.filter(id=> cards.get(id).title.toLowerCase().includes(q.toLowerCase())).length;
}
const el = colCountEls[c.id];
const text = q ? `${visible}/${total}` : `${total}`;
if(el.textContent !== text){ el.textContent = text; pop(el); }
const list = lists[c.id];
list.classList.toggle('is-empty', total===0);
list.classList.toggle('no-match', total>0 && visible===0 && !!q);
});
}
```
Empty message CSS:
```css
.col-list::after{content:none;}
.col-list.is-empty::after, .col-list.no-match::after{
content:attr(data-msg);
display:flex;align-items:center;justify-content:center;
flex:1; margin:4px 2px 10px;
border:1.5px dashed var(--line);
border-radius:8px;
font:11px var(--mono);letter-spacing:.06em;color:var(--ink-faint);
text-align:center; padding:18px 10px;
}
```
Wait — ::after inside a flex column list with flex:1 fills remaining space only if list stretched; when list has cards, ::after not displayed. But when is-empty, the ::after is the only child, flex:1 makes it fill. Set `data-msg` static in HTML: "No cards yet — drop one here" and for no-match override via CSS? Two different messages — set data-msg in JS or have two CSS rules with different content per class:
```css
.col-list.is-empty::after{content:'No cards yet — drop one here';}
.col-list.no-match::after{content:'No matches in this column';}
```
No data attribute needed.
But `.col-list` has `display:flex` — the ::after participates as flex item. When list has cards + is filtered, no ::after shows (class absent). When total>0 but visible===0 — cards are display:none, ::after shows via no-match. ✓.
pop(el): retrigger animation.
deleteCard(id):
```js
function deleteCard(id){
const cardEl = document.querySelector(`.card[data-id="${id}"]`);
const col = findColumnOf(id);
const idx = board[col].indexOf(id);
// animate out
cardEl.classList.add('is-removing');
const card = cards.get(id);
lastDeleted = {card, col, idx};
setTimeout(()=>{
cards.delete(id);
board[col].splice(idx,1);
renderAll();
showToast(`“${truncate(card.title,26)}” deleted`);
}, 180);
}
```
Hmm, deleting from state inside timeout while another action could interleave (user does something within 180ms) — negligible risk; but safer: remove from state immediately, keep the DOM element? renderAll would drop it instantly killing animation. Alternative: don't re-render; remove element from DOM after animation, and update state immediately:
```js
function deleteCard(id){
const col = findColumnOf(id);
const idx = board[col].indexOf(id);
board[col].splice(idx,1);
const card = cards.get(id); // keep in map for undo
lastDeleted = {id, col, idx};
const el = document.querySelector(...);
el.classList.add('is-removing');
el.addEventListener('animationend', ()=> el.remove(), {once:true});
updateCounts(); // count decrements immediately — but ::after empty state appears while card still animating? is-empty only when total 0; the animating card still occupies space; ok.
showToast(...);
}
```
But keep card in `cards` map for undo — then any code iterating cards map... renderAll only reads via board ids, so extra map entries harmless. But undo re-adds id to board[col] at idx and re-renders — card object still in map. ✓. If user adds new cards meanwhile, `no` sequence unaffected. Undo after another delete of same? Only lastDeleted kept. Fine.
Edge: animationend might not fire if... it will, class is-removing has animation. Use fallback timeout as well? I'll do both: `setTimeout(()=> el.remove(), 200)` safety — but double remove harmless (el.remove() twice OK). Actually just use setTimeout(200), simpler and deterministic. Animation duration 180ms.
is-removing CSS:
```css
.card.is-removing{animation:card-out .18s ease both;}
@keyframes card-out{to{opacity:0;transform:scale(.9) translateY(2px);}}
```
Undo:
```js
undoBtn in toast. click: if lastDeleted: board[lastDeleted.col].splice(min(idx, len),0,lastDeleted.id); renderAll(); animate the restored card (entering); hideToast(); lastDeleted=null;
```
Toast:
```js
let toastTimer;
function showToast(msg){
toastMsg.textContent = msg;
toast.classList.add('show');
clearTimeout(toastTimer);
toastTimer = setTimeout(hideToast, 4000);
}
```
Toast markup: `<div class="toast"><span class="toast-msg"></span><button class="toast-undo">Undo</button></div>`.
toast styling: position fixed bottom center; bg var(--ink); color var(--bg); padding 10px 12px 10px 16px; radius 10px; shadow; font mono 12px; display flex gap 14px align center. Undo button: underline accent text? In inverted colors: `background:transparent;color:var(--accent-on-ink)`? accent on ink bg: use a lighter accent: color-mix accent 70% white? For both themes, --toast-accent maybe just var(--accent) bright. Light theme ink bg #211c15 with accent #e0602e text — visible. OK: `.toast-undo{font:700 11px var(--mono);letter-spacing:.12em;text-transform:uppercase;color:#ff8f5e?}` Hmm keep simple: color: var(--toast-link) defined per theme: light: #f2a084? Let me just use `color:#e58a63` works on both ink shades. Add underline offset. Hover brightens.
Modal logic:
```js
let modalReturnFocus = null;
let selectedPriority = 'medium';
let selectedColumn = 'todo';
function openModal(colId){
if(colId) selectedColumn = colId;
syncSegs();
overlay.classList.add('is-open');
modal.setAttribute('aria-hidden','false');
titleInput.value=''; titleInput.classList.remove('invalid');
errorEl.hidden = true;
setTimeout(()=> titleInput.focus(), 60); // or immediate
}
```
Immediate focus fine (visibility transition + focus works).
Segmented click handlers (delegate on container):
```js
function wireSeg(container, setter){
container.addEventListener('click', e=>{
const btn = e.target.closest('.seg'); if(!btn) return;
container.querySelectorAll('.seg').forEach(b=>b.classList.toggle('is-on', b===btn));
setter(btn.dataset.val);
});
}
```
Form submit:
```js
form.addEventListener('submit', e=>{
e.preventDefault();
const title = titleInput.value.trim();
if(!title){
titleInput.classList.add('invalid');
errorEl.hidden = false;
modal.classList.remove('shake'); void modal.offsetWidth; modal.classList.add('shake');
titleInput.focus();
return;
}
addCard(title, selectedPriority, selectedColumn);
closeModal();
});
```
addCard:
```js
function addCard(title, priority, col){
const id = 'c'+(++seq);
const card = {id, no:++noSeq, title, priority};
cards.set(id, card);
board[col].unshift(id);
renderAll();
const el = document.querySelector(`.card[data-id="${id}"]`);
if(el){ el.classList.add('entering'); }
pop column count? updateCounts handles pop.
}
```
Hmm — entering animation only on the new card; renderAll rebuilds all — other cards jump? They're identical content, no animation, no visual glitch (maybe focus loss but fine).
But wait: renderAll rebuilds cards even in other columns — fine.
Also input listeners to clear invalid state while typing.
Close on Escape:
```js
document.addEventListener('keydown', e=>{
if(e.key==='Escape' && overlay.classList.contains('is-open')) closeModal();
// focus trap Tab handling
});
```
Focus trap: on Tab within overlay, keep focus inside modal:
```js
overlay.addEventListener('keydown', e=>{
if(e.key!=='Tab') return;
const focusables = modal.querySelectorAll('button, input, [tabindex]');
... wrap
});
```
Implement small trap.
Backdrop click: `overlay.addEventListener('click', e=>{ if(e.target===overlay) closeModal(); })`.
closeModal: remove is-open, aria-hidden true, return focus to modalReturnFocus.
Column add buttons: `data-addcol` → openModal(colId) and set selectedColumn.
Also the header "New card" button: opens with last used/ default column? Default 'todo' or remember previous selection. Remember previous selectedColumn (persisted in memory) — fine.
Now theme toggle:
```js
themeBtn.addEventListener('click', ()=>{
const next = root.dataset.theme === 'light' ? 'dark' : 'light';
root.classList.add('theme-anim');
root.dataset.theme = next;
themeBtn.classList.remove('spin'); void themeBtn.offsetWidth; themeBtn.classList.add('spin');
setTimeout(()=> root.classList.remove('theme-anim'), 450);
});
```
CSS: `.theme-anim *{transition: background-color .35s ease, border-color .35s ease, color .35s ease, box-shadow .35s ease !important;}` — careful: this overrides card hover transitions temporarily; ok for 450ms. Also it may override the dragging phantom animation? `animation` not affected. OK. Actually `!important` overriding `transition` of transform on cards during theme switch — cards aren't moving then. Fine.
Icon spin: `.icon-btn.spin svg{animation:spin .4s ease;} @keyframes spin{from{transform:rotate(0)}to{transform:rotate(180deg)}}` — since only one svg visible, nice.
Prefers-color-scheme: I decided default light. Could also honor system: `if(matchMedia('(prefers-color-scheme: dark)').matches) root.dataset.theme='dark'`. For screenshot determinism in the judging harness (likely light OS), either is fine. I'll honor the system preference — it's the polished choice, and light default when unknown. Hmm, but if judge's system is dark, screenshot shows dark theme — my dark theme is also designed well, so fine either way. I'll honor system preference. Actually... deterministic light default guarantees my strongest look is shown. Let me default light always but respect is fine... Decision: default light, deterministic. (Toggle is one click away.) Hmm, honoring prefers-color-scheme is standard good practice; but for an apples-to-apples screenshot comparison, deterministic light is safer and my light "paper editorial" theme is the signature look. Going with deterministic light.
Wait, one more thought — should I include `meta name="color-scheme"`? Set `color-scheme: light` on :root and `dark` when theme dark. Yes.
Now, the DnD listeners wiring on columns: columns exist in static HTML; wire once at init. Lists referenced by data-list.
dragover on column:
```js
COLUMNS.forEach(c=>{
const col = colEls[c.id];
const list = lists[c.id];
col.addEventListener('dragover', e=>{
if(!dragged) return;
e.preventDefault();
e.dataTransfer.dropEffect = 'move';
setOver(col);
const after = getDragAfterElement(list, e.clientY);
if(after == null) list.appendChild(phantom);
else list.insertBefore(phantom, after);
});
col.addEventListener('drop', e=>{
if(!dragged) return;
e.preventDefault();
list.insertBefore(dragged, phantom);
// also unhide
finishDrag(true);
});
});
```
finishDrag:
```js
function finishDrag(){
if(!dragged) return;
dragged.classList.remove('drag-hidden');
dragged = null;
phantom.remove();
if(ghostEl){ ghostEl.remove(); ghostEl=null; }
clearOver();
syncFromDOM();
}
```
syncFromDOM → also applyFilter (title unchanged, but keep filter class correct — the element retained its classes; but after re-render? No re-render here; DOM moved only. Just updateCounts.) Also add a settle animation on the dropped card: capture in drop handler before finishDrag: add class 'landing' with a quick settle keyframe. `dragged.classList.add('landing')` then remove on animationend/timeout.
Also dragstart:
```js
function onDragStart(e){
dragged = e.currentTarget;
e.dataTransfer.effectAllowed='move';
try{ e.dataTransfer.setData('text/plain', dragged.dataset.id); }catch(_){}
const rect = dragged.getBoundingClientRect();
// ghost image
ghostEl = dragged.cloneNode(true);
ghostEl.classList.add('drag-image');
ghostEl.style.width = rect.width+'px';
document.body.appendChild(ghostEl);
try{ e.dataTransfer.setDragImage(ghostEl, Math.min(rect.width/2, 60), 18); }catch(_){}
// hide origin after snapshot
setTimeout(()=>{ if(dragged) dragged.classList.add('drag-hidden'); },0);
dragged.parentNode.insertBefore(phantom, dragged);
}
```
Position ghost off-screen: CSS `.drag-image{position:fixed;left:-10000px;top:0;transform:rotate(2deg);box-shadow:0 18px 40px -12px rgba(0,0,0,.45);opacity:1;pointer-events:none;}`. But wait: if ghost is at left:-10000px, does Chrome render drag image from it? Yes — Chrome uses element rendering, doesn't need on-screen. There's a known caveat that element must not be display:none. Off-screen fixed is the standard trick and works in Chrome. Firefox also OK. Good.
But careful: the cloned ghost has the card-del button etc. It's inert (pointer-events none), fine. Also the clone carries data-id — duplicated data-id in DOM temporarily; my `document.querySelector('.card[data-id=...]')` in deleteCard would pick the first match — ghost removed at dragend, transient. Minor. But also `syncFromDOM` uses list.querySelectorAll within lists — ghost is in body, not in a list. ✓.
drag-hidden:
```css
.card.drag-hidden{display:none;}
```
dragend:
```js
function onDragEnd(){
finishDrag(); // if drop already handled, dragged is null → no-op
}
```
Wait: in drop handler I insert and call finishDrag which sets dragged=null; then dragend fires → finishDrag no-ops. ✓. If drop outside columns (cancelled): dragend → finishDrag unhides card at original position, phantom removed... but wait, if phantom is still inside some column's list where it was last hovering (drag ended outside board) — finishDrag removes it. ✓. And the dragged card: was still in its original list position (hidden) — unhidden there. But hold on: what if phantom ended up in a different column and drop occurred there? Covered by drop handler. What if drop fires on the column but my handler requires dragged — set. ✓.
Edge: dragenter/leave over`iframe` — sandbox page itself is the iframe; fine.
Also note: during drag, hovering over the modal or header clears over-highlight via document dragover handler. Add:
```js
document.addEventListener('dragover', e=>{
if(!dragged) return;
if(!e.target.closest('.column')) clearOver();
});
```
And swallow stray drops:
```js
document.addEventListener('drop', e=> e.preventDefault());
document.addEventListener('dragover', e=> e.preventDefault());
```
Hmm — careful: document-level dragover preventDefault for ALL drags including external file drags — fine for demo. But does preventing default on document dragover affect our column handler? No; both run. But one subtlety: preventing default on document dragover makes dropEffect default 'move' everywhere; harmless.
Actually wait, there's a potential problem: with document dragover preventDefault, when dragging over a column, e.target is a card (child); document handler checks `e.target.closest('.column')` → non-null → doesn't clearOver. But we also preventDefault at document level — that's the swallow behavior, independent. ✓.
Order check: our column 'dragover' handler calls e.preventDefault() → sets that the drop is allowed on the column. Document handler preventDefault additionally — when NOT over a column, drop would be allowed on document too; document drop preventDefault swallows it (prevents browser default like navigating). Good.
syncFromDOM:
```js
function syncFromDOM(){
COLUMNS.forEach(c=>{
board[c.id] = [...lists[c.id].querySelectorAll('.card')].map(el=> el.dataset.id);
});
updateCounts();
}
```
Note: phantom isn't a .card so excluded; hidden dragged card? At finishDrag, dragged was already re-inserted & unhidden before sync. Order in drop handler: insertBefore(dragged, phantom) — card still has drag-hidden class (display none) but is in DOM before phantom; finishDrag removes class then syncs. In syncFromDOM the dragged element is a .card in list — included ✓ (even if display none at that moment, querySelectorAll still selects; but we removed the class already).
renderAll — also needs to keep filter and counts; call applyFilter() then updateCounts() (applyFilter calls updateCounts — fine).
Wait, careful: renderAll sets list.innerHTML='' then appends. If phantom is inside a list (during a drag, user adds card via modal? Can't — modal covers; but keyboard? drag captures pointer; ok). Non-issue.
One more: `draggable=true` on cards; dragging text inside input? separate.
Delete button inside draggable card: mousedown on button might start card drag? Buttons have their own behavior; drag would start on card since button is inside draggable... Actually dragging from the delete button: mousedown on the button, then move → the card (draggable ancestor) starts dragging. The click still fires if no movement. Slightly awkward but standard; Trello has same. Could set `draggable=false`? Not settable on the button to prevent ancestor drag... There's a trick: set the card draggable dynamically on pointerdown target. Keep simple — standard behavior acceptable. Or: make delete button `draggable="true"` too?? No. Fine as is.
Count chip pop animation function:
```js
function pop(el){ el.classList.remove('pop'); void el.offsetWidth; el.classList.add('pop'); }
```
Landing animation:
```css
.card.landing{animation:land .28s cubic-bezier(.2,.8,.3,1.4);}
@keyframes land{0%{transform:scale(1.04);}60%{transform:scale(.99);}100%{transform:scale(1);}}
```
Add class on drop: after inserting, `dragged.classList.add('landing')`; remove after timeout 300ms (avoid lingering transform issues). Use setTimeout remove.
Hmm — card also has hover transform translate; combined animation fine.
Now HTML for icons:
- plus: `<svg viewBox="0 0 14 14"><path d="M7 2v10M2 7h10" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" fill="none"/></svg>`
- search: `<svg viewBox="0 0 16 16" fill="none"><circle cx="7" cy="7" r="4.6" stroke="currentColor" stroke-width="1.6"/><path d="M10.5 10.5L14 14" stroke="currentColor" stroke-width="1.6" stroke-linecap="round"/></svg>`
- moon: `<svg viewBox="0 0 16 16" fill="none"><path d="M13.4 9.6A6 6 0 1 1 6.4 2.6a5 5 0 1 0 7 7z" fill="currentColor"/></svg>` — crescent path. Let me use a known crescent path: `M10.7 1.6a6.5 6.5 0 1 0 3.7 3.7 5.2 5.2 0 0 1-3.7-3.7z`? I'll write: `<path d="M11.9 9.8A5.6 5.6 0 1 1 6.2 4.1a4.4 4.4 0 0 0 5.7 5.7z"` hmm need to get a decent crescent. Standard lucide moon: `<path d="M12 3a6 6 0 0 0 9 9 9 9 0 1 1-9-9Z"/>` for 24 viewBox. Scale to 16: viewBox 24, size 16 attr. Use lucide's moon path with viewBox 24: `M12 3a6 6 0 0 0 9 9 9 9 0 1 1-9-9Z` fill currentColor? Lucide uses stroke. I'll use fill="none" stroke="currentColor" stroke-width="2" with that path — clean crescent outline.
- sun: circle + rays: `<circle cx="12" cy="12" r="4"/><path d="M12 2v2M12 20v2M4.9 4.9l1.4 1.4M17.7 17.7l1.4 1.4M2 12h2M20 12h2M4.9 19.1l1.4-1.4M17.7 6.3l1.4-1.4"/>` stroke.
- close ×: cross path.
- check for footer? not needed.
All svgs inline with `aria-hidden="true"` where decorative.
Now: "New card" accent button with plus svg + text "New card". Mono uppercase 11px bold letterspacing .12em.
Topbar composition — brand at left; right controls. Let me add a middle spacer? Just space-between.
Footer:
```html
<footer class="foot">
<span>drag cards between columns</span>
<span class="foot-sep">·</span>
<span>click × on a card to delete</span>
<span class="foot-sep">·</span>
<span>state lives in memory only — refresh resets the board</span>
</footer>
```
Mono 10.5px faint; flex wrap center? Left aligned under board. Wrap: fine.
Also maybe include a keyboard hint? Not needed.
Let me now also handle: search clear button click → clear input, query='', applyFilter, focus input, hide clear.
`has-value` class toggle in input handler. ✓.
Now, are there any console error risks?
- `color-mix` — supported.
- `:focus-within` — supported.
- Template literals fine.
- `hidden` attribute with CSS `display:flex` conflict: I use class-based visibility for overlay instead of hidden attr — but I wrote `[hidden]` earlier; switch to class 'is-open' only; overlay default `visibility:hidden;opacity:0;pointer-events:none` and not `display:none`? If display:none, transition won't animate on open. Using visibility+opacity transitions: works. But overlay always rendered — screen readers? Add aria-hidden toggling and `inert`? Simple: toggle `aria-hidden` attribute. Also with visibility:hidden, it's excluded from tab order. ✓.
Actually initial state: `visibility:hidden; opacity:0;` — transition visibility delay on close so modal fades then hides: `transition: opacity .18s ease, visibility 0s linear .18s;` and `.is-open{transition: opacity .18s ease; visibility:visible;opacity:1}`. Good pattern.
Modal aria: role dialog, aria-modal, aria-labelledby. Manage aria-hidden on overlay: set aria-hidden="true" default in HTML, flip in JS.
Focus trap implementation:
```js
overlay.addEventListener('keydown', e=>{
if(e.key!=='Tab') return;
const f = [...modal.querySelectorAll('button, input')].filter(el=>!el.disabled && el.offsetParent!==null);
if(!f.length) return;
const first=f[0], last=f[f.length-1];
if(e.shiftKey && document.activeElement===first){ e.preventDefault(); last.focus(); }
else if(!e.shiftKey && document.activeElement===last){ e.preventDefault(); first.focus(); }
});
```
offsetParent null check for hidden elements — fine.
Escape handling: document keydown.
Now CSS full write-up. Let me define everything carefully to look premium.
Also add `prefers-reduced-motion` media query to disable animations — professional touch:
```css
@media (prefers-reduced-motion: reduce){ *{animation-duration:.01ms !important; transition-duration:.01ms !important;} }
```
Body background with dot grid:
```css
body{
background-color: var(--bg);
background-image: radial-gradient(var(--bg-dot) 1px, transparent 1.2px);
background-size: 22px 22px;
}
```
Hmm — "no decorative gradients": radial-gradient here is a dot pattern technique, not a color-fade gradient; it's a texture. I consider it tasteful and not a "gradient" in the prohibited sense (the rule targets gradient banners/buttons/glows). A paper dot-grid is a deliberate texture. I'll keep it subtle (very low contrast).
Card shadow: `0 1px 2px rgba(24,18,10,.06), 0 2px 8px -4px rgba(24,18,10,.08)`; hover: `0 8px 20px -8px rgba(24,18,10,.25), 0 2px 6px -2px rgba(24,18,10,.12)` + translateY(-2px). Dark theme shadows need stronger black: use a --card-shadow variable per theme.
Let me define theme variable sets fully:
```css
:root, html[data-theme="light"]{
color-scheme: light;
--bg:#f2eee3;
--bg-dot:rgba(46,38,26,.07);
--ink:#221c12;
--ink-soft:rgba(34,28,18,.66);
--ink-faint:rgba(34,28,18,.42);
--line:rgba(34,28,18,.16);
--line-strong:rgba(34,28,18,.34);
--col-bg:#e9e4d4;
--col-head:#e3ddcb;
--card-bg:#faf7ee;
--accent:#bf3f16; /* vermillion */
--accent-soft:rgba(191,63,22,.08);
--accent-contrast:#faf5ea;
--mark:rgba(240,190,60,.5);
--high:#b13a17;
--medium:#8a6512;
--low:#42704f;
--card-sh:0 1px 2px rgba(40,32,18,.08),0 3px 10px -6px rgba(40,32,18,.14);
--card-sh-hover:0 2px 4px rgba(40,32,18,.08),0 12px 24px -10px rgba(40,32,18,.28);
--overlay:rgba(30,24,14,.44);
--toast-bg:#221c12;
--toast-ink:#f2eee3;
--toast-link:#f2a587;
--col-a:#8f886f; /* column top accents */
--col-b:#bf3f16;
--col-c:#42704f;
}
html[data-theme="dark"]{
color-scheme: dark;
--bg:#171410;
--bg-dot:rgba(242,238,227,.045);
--ink:#ece5d3;
--ink-soft:rgba(236,229,211,.66);
--ink-faint:rgba(236,229,211,.4);
--line:rgba(236,229,211,.15);
--line-strong:rgba(236,229,211,.35);
--col-bg:#1e1a14;
--col-head:#231e17;
--card-bg:#28221a;
--accent:#e0642f;
--accent-soft:rgba(224,100,47,.1);
--accent-contrast:#1c130b;
--mark:rgba(224,178,60,.32);
--high:#ef8557;
--medium:#d3ab55;
--low:#7bab8a;
--card-sh:0 1px 2px rgba(0,0,0,.35),0 4px 12px -6px rgba(0,0,0,.4);
--card-sh-hover:0 2px 6px rgba(0,0,0,.4),0 14px 28px -12px rgba(0,0,0,.55);
--overlay:rgba(8,6,3,.55);
--toast-bg:#ece5d3;
--toast-ink:#221c12;
--toast-link:#b0431a;
--col-a:#7d7660;
--col-b:#e0642f;
--col-c:#7bab8a;
}
```
accent-contrast in dark = dark text on orange — good.
Column top border: `.column{border-top:3px solid transparent;}` and per column: `.column[data-col="todo"]{border-top-color:var(--col-a);}` etc. Combined with border elsewhere: use border-top only + regular border for rest: `border:1px solid var(--line); border-top:3px solid var(--col-x);` radius 12px. Column bg var(--col-bg).
Column over state: `outline:2px dashed var(--accent); outline-offset:-2px; background: color-mix(in srgb, var(--accent) 6%, var(--col-bg));` — wait, bg change + outline dashed. Plus when over, the top border could become accent? outline suffices. Let me also make header show accent when over: skip.
Font variables:
```css
--serif:"Iowan Old Style","Palatino Linotype","Book Antiqua",Palatino,Georgia,"Times New Roman",serif;
--mono:ui-monospace,"SF Mono","Cascadia Mono","Segoe UI Mono",Menlo,Consolas,monospace;
```
Base:
```css
*{box-sizing:border-box;}
html,body{margin:0;}
body{font-family:var(--serif);color:var(--ink);background:...;-webkit-font-smoothing:antialiased;min-height:100vh;overflow-x:hidden;}
```
Card title font: serif 15.5px/1.4 weight 500? Serif bold can look heavy; use 500ish. Georgia weight rendering only 400/700 — use 400 with size 16px. Let's: `font:400 16px/1.4 var(--serif); letter-spacing:.005em;`.
Card paddings: 12px 14px; meta margin-top 10px, flex gap 8 align center. Nº label margin-left auto (push right) — meta row: badge left, Nº right. Nice.
Delete button: position absolute top 8px right 8px; 22x22; radius 6; color var(--ink-faint); background transparent; border 0; opacity .55; transition; hover: color var(--high); background color-mix(high 10%); opacity 1. Card padding-right ~30px so title doesn't overlap: title margin-right 24px.
Card hover raises delete opacity to .9 (visible). Since demo screenshot: buttons faintly visible — acceptable and clean.
Now count text "Nº 04" — wait, cards get numbers 01-06; newly added continue 07... ✓.
Column list gap: 10px; padding: 10px.
Column head: padding: 11px 12px 10px; then rule: `border-bottom:1px solid var(--line)` on .col-head with background var(--col-head) and radius top: since column has overflow hidden? Set `.column{overflow:hidden}` to clip head bg to radius — but overflow hidden may clip card hover shadow at edges slightly — shadow extends outside column? Cards are inside list padding 10px, shadows extend ~10px; with overflow hidden, shadows clipped at column edge — topmost card's hover shadow could clip at column border. Minor. Alternatively give head its own radius: `.col-head{border-radius:11px 11px 0 0}` and column overflow visible. border-top of column 3px + head bg fills? The head bg would cover radius area but column bg same-ish color. Radius mismatch minor. Use overflow:hidden — shadow clipping negligible since cards are inset 10px and shadow blur 12-24 spread negative... hover shadow y up to 12px blur -10 spread: could reach edge. Eh. Use overflow:hidden anyway; looks cleaner; shadow clipping at column boundary is barely noticeable (column has its own bg delineation). Actually simplest: skip head bg (keep column bg uniform), just use border-bottom line under head. Then no overflow needed, no radius mismatch. Column: solid col-bg with a 1px border + 3px top status border; head separated by 1px line. Clean. Do that.
col-add button: 24x24, radius 6, faint, plus icon 12px; hover: accent color + accent-soft bg.
Board:
```css
.board{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:14px;align-items:stretch;}
```
Hmm auto-fit with stretch: with 3 columns at wide screens fine. At ~800px: 2 columns, third below. Actually minmax(300px,1fr): at content width 1232-28 = 1204; (1204+14)/... 3 cols need 300*3+28=928 ✓ 3 cols. Between 628-928: 2 cols; below 628: 1 col. Fine. Cards min-width handled by minmax(0,...)? minmax(300px,1fr) can overflow if container < 300+... at 375 viewport: container ~ 375-32=343 ≥300 ✓ single column. Between 614-628 fine. At width ~600: 1 col. OK no overflow since 343>300. But at 320px viewport? Spec says 375 min. OK.
Actually careful: `repeat(auto-fit,minmax(300px,1fr))` — when only e.g. 2 fit, auto-fit collapses empty tracks so the 2 columns stretch full width, and third column wraps to next row? No! auto-fit does NOT wrap — it's a single grid with tracks; with minmax(300px,1fr) you can't fit 3 tracks at 700px width... Grid doesn't wrap items; auto-fit creates as many tracks as fit?? Hmm, actually `repeat(auto-fit, ...)` creates number of columns based on container width — yes it does respond: the number of repeated tracks is determined by how many fit the container. So at 700px: 2 tracks (600+gap). 3 items → third goes to row 2 occupying track 1, leaving track 2 empty in row 2. Slightly awkward gap but acceptable; at that width it's transient. Alternatively media queries: 3 cols → 2 cols (third spans both? `grid-column: 1/-1`?) → 1 col. Let me do explicit media queries:
```css
.board{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;}
@media (max-width:940px){.board{grid-template-columns:minmax(0,1fr);}}
```
Simplify: 3 columns until 940px, then 1 column. Two columns at 900 wide would be cramped for cards + wide empty space? 1 column stack on tablet is fine and clean. Go with that. minmax(0,1fr) prevents overflow from long titles.
At 375: column stacks; card title wraps; fine. Topbar wraps: brand then controls; search width: make search flex:1 min-width 140 at small. Controls wrap: order: search full row? `.controls{flex-wrap:wrap}` and at small give search `flex:1 1 100%`? Let me: `@media (max-width:640px){ .search{flex:1 1 160px;} }` and `.controls{flex:1}`? Simplest: `.controls{display:flex;gap:10px;align-items:center;flex-wrap:wrap;justify-content:flex-end;}` with `.search{flex:1 1 180px;max-width:280px}` — at small, search takes remaining width. Buttons stay. Works.
Card `max-width` for title: word-wrap: `overflow-wrap:anywhere` on title to prevent overflow with long strings.
Now heights: columns stretch to tallest. `.column{display:flex;flex-direction:column;min-height:170px;}` `.col-list{flex:1;display:flex;flex-direction:column;gap:10px;padding:10px;min-height:60px;}`.
Landing/entering animation classes must not conflict: fine.
Let me also double-check the modal priority segmented default is-on for medium and column segmented set by JS on open (syncSegs toggles is-on per selectedColumn). Initial HTML: colSeg first (todo) is-on; prioSeg medium is-on.
The `New card` per-column buttons: after modal closes focus returns to them.
Toast z-index above modal? 60 > 50. Toast appears on delete; modal closed then. fine.
Also: after undo, hide toast, clear lastDeleted.
What about deleting while search active — fine, applyFilter on render.
Now write the render + init:
```js
const COLUMNS=[{id:'todo',label:'To do'},{id:'progress',label:'In progress'},{id:'done',label:'Done'}];
const lists={}, colEls={}, colCountEls={};
COLUMNS.forEach(c=>{ colEls[c.id]=document.querySelector(`.column[data-col="${c.id}"]`); lists[c.id]=colEls[c.id].querySelector('.col-list'); colCountEls[c.id]=colEls[c.id].querySelector('.col-count'); });
const cards=new Map();
let board={todo:[],progress:[],done:[]};
let seq=0;
function seed(title,priority,col){ const id='c'+(++seq); cards.set(id,{id,no:seq,title,priority}); board[col].push(id); }
seed('Outline the Q3 product roadmap','high','todo');
...
```
Wait no: seq doubles as card number — but deleted cards consume numbers; fine (like real indices).
renderAll on init.
Also `findColumnOf(id)`: loop columns.
Everything's set. Let me also consider: after drop, counts pop via updateCounts (textContent changes → pop). ✓ The "stamp" moment.
Wait — syncFromDOM maps element order to board ids — but I should also re-apply filter? Element classes preserved; counts updated. ✓.
One issue: `updateCounts` pop animation triggers whenever text changes — including filter typing (each keystroke pop). That's fine, feels responsive.
Another subtle thing: `.col-list::after` empty states have `flex:1` — but if `.is-empty` and the list contains cards that are filtered? is-empty means total===0 so no cards. no-match means all filtered out. ::after with flex:1 fills. But also when not empty and cards present, no ::after. But what about list padding creating space when empty: with min-height on column 170px, list flex:1 gives decent drop area. ✓.
Also for the empty message vertical centering: `.col-list::after` as flex item with flex:1 — displays across full remaining height with centered content. ✓.
Potential issue: `content` in ::after with plain text including quotes/apostrophes — fine. Use: 'No cards yet — drop one in' / 'Nothing matches your filter'.
Also — the drop phantom inside an empty list: phantom appended; ::after still shows behind? When dragging over empty list, class is-empty still on list (total 0) → ::after shows below phantom; phantom height 52; looks okay — both visible. Maybe hide ::after while a drag is active over that column: add class 'drag-target' to column → `.column.drag-target .col-list::after{display:none}`? Hmm, when over, I add 'over' to column: `.column.over .col-list::after{display:none}`. But 'over' persists only while hovering; good. Add that rule. But wait, is-empty class remains; fine. Also when dragging over a non-empty column no ::after anyway. Add rule: `.column.over .col-list::after{display:none;}`.
Now, also the case: dropping into empty column list: phantom appended (list has phantom + ::after hidden). Drop inserts card. ✓.
Now writing the modal HTML with proper labels:
```html
<div class="overlay" id="overlay" aria-hidden="true">
<div class="modal" role="dialog" aria-modal="true" aria-labelledby="modalTitle" id="modal">
<div class="modal-head">
<h2 id="modalTitle">New card</h2>
<span class="modal-kicker">fill, drop, done</span>?
<button class="modal-x" id="modalClose" aria-label="Close">×svg</button>
</div>
...
```
Keep modal head: small mono kicker "NEW CARD" + close button. Then form.
Full form:
```html
<form id="cardForm" novalidate>
<div class="field">
<label class="field-label" for="fTitle">Title <span class="req" aria-hidden="true">*</span></label>
<input class="field-input" id="fTitle" type="text" placeholder="e.g. Draft the changelog for v2.4" autocomplete="off" maxlength="90">
<p class="field-error" id="fTitleError" hidden>A card needs a title.</p>
</div>
<div class="field-row">
<div class="field">
<span class="field-label" id="prioLabel">Priority</span>
<div class="segmented" id="prioSeg" role="group" aria-labelledby="prioLabel">
<button type="button" class="seg" data-val="low">Low</button>
<button type="button" class="seg is-on" data-val="medium">Medium</button>
<button type="button" class="seg" data-val="high">High</button>
</div>
</div>
<div class="field">
<span class="field-label" id="colLabel">Column</span>
<div class="segmented" id="colSeg" role="group" aria-labelledby="colLabel">
<button type="button" class="seg is-on" data-val="todo">To do</button>
<button type="button" class="seg" data-val="progress">In progress</button>
<button type="button" class="seg" data-val="done">Done</button>
</div>
</div>
</div>
<div class="modal-foot">
<button type="button" class="btn btn-ghost" id="cancelBtn">Cancel</button>
<button type="submit" class="btn btn-accent">Add card</button>
</div>
</form>
```
Field-row: two fields side by side; at narrow, wrap. Column segmented labels long ("In progress") — widths ok in 440px modal? "To do / In progress / Done" mono 10px uppercase: roughly 45+80+45 + padding ~ 210px; priority ~ 150. Side by side total ~ 400 > available (modal 440 - padding 44 = 396). Tight. Stack them vertically instead: priority field then column field, full width. Cleaner. Do vertical stack, gap 16.
Modal head kicker: "New card" big serif italic + close x. Title: font italic 22px serif.
Field labels: mono 10px uppercase ls .14em color ink-soft; margin-bottom 6.
req asterisk: color var(--high).
modal-foot: margin-top 20; display flex; justify-content flex-end; gap 10.
Also small footnote in modal? "Cards land at the top of the column." maybe nice mono hint under buttons left side: flex space-between: hint left, buttons right. Nice editorial. Add `<p class="modal-hint">new cards land on top of the column</p>` mono 10px faint. At narrow, hide hint (or wrap). ok.
Error message: shown under input.
Input invalid style + remove on input event.
Now, the "shake" animation on the modal for invalid:
```css
@keyframes shake{20%{transform:translateX(-5px)}40%{transform:translateX(4px)}60%{transform:translateX(-3px)}80%{transform:translateX(2px)}}
.modal.shake{animation:shake .32s ease;}
```
Note modal has transition transform for open; animation overrides transform — after animation ends returns to none. ok.
Now finalize JS structure. Also `wireSeg` uses selectedPriority/selectedColumn variables.
Also — one more consideration about `e.dataTransfer.setData` requirement: Firefox requires setData for drag to start; we call it in try. Fine.
Ghost element sizing: cloneNode keeps classes; width set explicitly since position:fixed loses width context (card width auto from parent; fixed width set). Also clone includes inline? none. Set styles: position fixed, left -10000, top 0, width px, pointer-events none, and class drag-image adds rotation + shadow + maybe scale. Also ensure ghost doesn't include drag-hidden class (source might be hidden? no, clone made before hide). Also remove ghost's draggable? irrelevant.
Also, the clone has card-del button clickable? pointer-events:none on .drag-image handles it.
`setDragImage(ghostEl, x, y)`: offset within element: use (rect.width*0.5, 20)? If x/y beyond element size, Chrome clamps. Fine.
Hmm, one caveat: cloned card contains `<mark>` if search active — fine, or is-filtered class? clone of a visible card. ok.
Chrome drag image from fixed off-screen element — I'm fairly confident this works (common technique). If it silently fails, drag image = snapshot of card itself — still fine. Low risk.
Also drag image snapshot happens at dragstart — includes our rotate transform? The ghost has CSS class with transform rotate(2deg) scale(1.02) — captured. Good, gives a "lifted card" feel.
Now — the `drag-hidden` timeout: also note the phantom insertion: `dragged.parentNode.insertBefore(phantom, dragged)` — dragged's parent is a col-list ✓.
Then when dragover on some other column inserts phantom elsewhere, the original position gap closes since phantom moved. The origin column might become empty → is-empty class? updateCounts isn't called during drag (only after drop), so ::after state unchanged during drag — column might look empty without message. Fine.
Landing: after drop insert, add 'landing' class & setTimeout remove 350ms. Also pop the count (updateCounts does).
Also — I want the dropped card in "Done" to feel conclusive: when a card lands in Done, add a quick one-time check flash? Could add class 'just-done' → title briefly underlined in green? Might complicate; the settle + count pop is enough.
Let me now also think about the topbar visual hierarchy for the screenshot: Brand "Index." large serif italic; the sub-line mono. Right: search, theme, accent button. Board with 3 columns, 6 cards with colorful badges. Footer hint. Light paper with dot grid, vermillion accents. Should look distinct and professional.
Maybe add a nice touch to brand: "Index." with a superscript "kanban" tag? Like `Index<sup>kb</sup>`? Gimmicky. Instead: brand-name "Index" + accent period. Sub: "a tiny kanban — three columns, six cards, all in memory". Hmm, "six cards" will become stale. Use: "a tiny kanban · everything lives in memory". But footer says similar. Footer: interaction hints; sub: "a tiny kanban for one busy human". Cute, editorial. Use that.
Also page <title>: "Index — a tiny kanban".
Wait, maybe brand name better as "Kardex"? "Index." is clean. Keep Index.
Accessibility bits: search input aria-label="Filter cards by title"; theme button aria-label toggles and aria-pressed? Fine with aria-label + title.
Delete button title "Delete card".
Let me write all the code now, being careful with syntax.
One more check on `highlight()` used in buildCard with currentQuery — buildCard calls highlight(card.title, query.trim().toLowerCase()). Let me define helper `getQ()`. In applyFilter I recompute innerHTML anyway; renderAll → applyFilter covers everything; buildCard can just set plain escaped title and applyFilter adds marks. Simplify: buildCard sets `titleEl.textContent = card.title`; applyFilter sets innerHTML with highlight. But applyFilter sets innerHTML every time query changes — fine. But careful: applyFilter called with empty q sets innerHTML = esc(title) — fine (equivalent).
But — initial render: renderAll → applyFilter ✓.
updateCounts uses query; visible computed there. ✓
Edge: query with only spaces: trim handles.
Let me make sure no `innerHTML` injection risk: highlight escapes. Toast message uses textContent. Delete aria-label uses esc(card.title) — attribute injection prevented by esc (quotes escaped). ✓
Card title element: `<h3 class="card-title">` inside article — heading per card ok.
Now sizes: card-title margin: 26px right for del button overlap; del at top-right; titles may be 2 lines.
Also: when title is 1 line and del button floats above right — fine.
Card meta: badge + Nº; Nº auto margin-left.
Let me write CSS for `.card-no{margin-left:auto;font:10px/1 var(--mono);letter-spacing:.14em;color:var(--ink-faint);text-transform:uppercase;}` Content: "Nº 04".
Badge colors:
```css
.badge{display:inline-flex;align-items:center;gap:6px;padding:3px 8px 2px 9px;border-radius:999px;border:1px solid;font:600 9.5px/1 var(--mono);letter-spacing:.12em;text-transform:uppercase;}
.badge-dot{width:5px;height:5px;border-radius:50%;background:currentColor;flex:none;}
.badge-low{color:var(--low);border-color:color-mix(in srgb,var(--low) 40%,transparent);background:color-mix(in srgb,var(--low) 9%,transparent);}
... medium, high similarly.
```
mark: `mark{background:var(--mark);color:inherit;padding:0 1px;border-radius:2px;}`
Now drag-hidden vs display none — also add `.card.drag-hidden{display:none !important;}`.
Phantom label 'DROP HERE' maybe too wordy; "drop here" lowercase mono? Uppercase 9px ls .22em accent. ✓.
Let me think about whether the column 'over' outline + phantom + ghost gives "clear visual drop indicator" — yes: dashed column outline, tinted bg, pulsing dashed placeholder with label at exact insertion point.
Now, code — writing final:
```html
<!DOCTYPE html>
<html lang="en" data-theme="light">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Index — a tiny kanban</title>
<style>
...
</style>
</head>
<body>
<div class="app">
<header class="topbar">
<div class="brand">
<h1 class="brand-name">Index<span class="brand-dot">.</span></h1>
<p class="brand-sub">a tiny kanban for one busy human</p>
</div>
<div class="controls">
<div class="search" id="searchWrap">
<svg class="search-icon" viewBox="0 0 16 16" ...>...</svg>
<input id="searchInput" type="text" placeholder="Filter by title…" aria-label="Filter cards by title" autocomplete="off">
<button class="search-clear" id="searchClear" type="button" aria-label="Clear filter">
<svg viewBox="0 0 12 12"...>cross</svg>
</button>
</div>
<button class="icon-btn" id="themeBtn" type="button" aria-label="Switch to dark theme">
<svg class="icon-moon" viewBox="0 0 24 24">...</svg>
<svg class="icon-sun" viewBox="0 0 24 24">...</svg>
</button>
<button class="btn btn-accent" id="addBtn" type="button">
<svg viewBox="0 0 14 14">plus</svg><span>New card</span>
</button>
</div>
</header>
<main class="board" id="board">
<section class="column" data-col="todo" aria-labelledby="col-todo">
<header class="col-head">
<h2 class="col-name" id="col-todo">To do</h2>
<span class="col-count" aria-label="Cards in To do">3</span>
<button class="col-add" data-addcol="todo" type="button" aria-label="Add card to To do" title="Add card here">plus svg</button>
</header>
<div class="col-list" data-list="todo"></div>
</section>
... progress, done
</main>
<footer class="foot">
<span>drag cards anywhere between columns</span><span class="dot-sep">·</span>
<span>× on a card deletes it</span><span class="dot-sep">·</span>
<span>nothing is saved — the board lives in memory</span>
</footer>
</div>
<div class="overlay" id="overlay" aria-hidden="true">
<div class="modal" id="modal" role="dialog" aria-modal="true" aria-labelledby="modalTitle">
...
</div>
</div>
<div class="toast" id="toast" role="status">
<span class="toast-msg" id="toastMsg"></span>
<button class="toast-undo" id="toastUndo" type="button">Undo</button>
</div>
<script>...</script>
</body>
</html>
```
Count aria-label static fine.
Now the script fully:
```js
(() => {
'use strict';
/* ---------- state ---------- */
const COLUMNS = [
{ id:'todo', label:'To do' },
{ id:'progress',label:'In progress' },
{ id:'done', label:'Done' },
];
const cards = new Map(); // id -> { id, no, title, priority }
const board = { todo:[], progress:[], done:[] }; // ordered ids per column
let seq = 0;
const seed = (title, priority, col) => {
const id = 'c' + (++seq);
cards.set(id, { id, no: seq, title, priority });
board[col].push(id);
};
seed('Outline the Q3 product roadmap','high','todo');
seed('Fix layout shift on the pricing page','medium','todo');
seed('Book a venue for the team offsite','low','todo');
seed('Rebuild the onboarding email sequence','high','progress');
seed('Refactor the date picker into a shared component','medium','progress');
seed('Archive the 2019 marketing site','low','done');
```
Wait — order: Nº by seed order 1..6 ✓.
DOM refs. Then functions.
Careful: col-count initial text set in HTML will be overwritten by updateCounts; put "0" initially.
Let me also handle `esc` name conflict none.
Full script (I'll write it in final answer carefully, checking each function).
Potential pitfall: `document.querySelectorAll` NodeList forEach — fine.
Phantom element creation and class.
Wire columns DnD.
Search wiring.
Modal wiring.
Theme wiring.
Toast.
Init: renderAll().
Also for the very first paint, maybe stagger card entrance animation: cards get 'entering' with animation-delay via inline style — a cascade on load makes first screenshot alive (screenshot at 3s — animation must be quick (done by ~1s) so cards are visible and settled in the screenshot. Use delays 0,40ms,80... total < 0.8s. Subtle rise-in. I'll add on initial render only: `initialBoot` flag; buildCard adds 'entering' + style.animationDelay = (i*45)+'ms'. Ensure animation fill backwards so they start hidden then appear. Screenshot at 3s: settled. ✓ Nice.
Implement: renderAll(animate) param; during init call renderAll(true). In renderAll, per column index i*0.04s delay.
Let me write keyframes:
```css
@keyframes card-in{from{opacity:0;transform:translateY(7px) scale(.985)}to{opacity:1;transform:none}}
.card.entering{animation:card-in .32s cubic-bezier(.22,.9,.32,1) both;}
```
With inline animationDelay + 'both' fill: backwards keeps it hidden until delay starts. ✓
Remove 'entering' class after? Animation completes; class lingers harmlessly (animation won't re-run unless class re-added... it re-runs if re-added after removal — we remove class after timeout to allow re-trigger? Only needed when re-adding same card (undo). renderAll creates fresh elements, so fine. But lingering class on cards — if user later drags, hover transform vs animation 'both' final state... animation fill both keeps final keyframe (transform:none) applied indefinitely?? Fill forwards applies the LAST keyframe forever — that would freeze transform:none and override hover translateY! Because animation fill forwards overrides normal styles. Yes — `fill: both` keeps `transform:none` applied after finish, which would block hover transform. Need to remove the class after animation. Add cleanup: on building, `setTimeout(()=>{el.classList.remove('entering'); el.style.animationDelay='';}, 800)`. Or use `animation-fill-mode: backwards` only — then after finish, styles revert to normal (which is transform:none default anyway). Use fill backwards! from-state applied during delay; after animation ends, element uses natural styles. `animation: card-in .32s ... backwards;` ✓ Elegant. Same for landing: `backwards`? landing from scale 1.04 to natural. With backwards fill only, after completion natural. ✓ Use backwards for card-in, land, card-out needs 'forwards' (to stay hidden until removed) — is-removing removed after 200ms anyway; use both for card-out but element removed right after. Fine.
Entering delay for boot: delays up to 5*45=225ms + .32 = ~0.55s. ✓
Also: applyFilter sets innerHTML each time — for boot it's fine.
Now, double-check the drop handler requirement that `drop` fires on column: since dragover preventDefault on column ✓. Also `drop` fires on the deepest element (card or list or ::after none) then bubbles to column — attach drop on column. ✓ Note: phantom is a child of list; drop event target could be phantom; bubbles to column handler ✓.
getDragAfterElement with y coordinate — pointer within column but over the list area between cards: appended or inserted relative — works.
Also while dragging over the SOURCE column before moving: phantom starts at card's original spot ✓.
One more: `.card` elements also have `animation: card-in backwards` lingering class 'entering' — after cleanup they're fine.
Check contrast: ink #221c12 on bg #f2eee3 — strong ✓. ink-soft 66% — ok for secondary. ink-faint .42 for hint text — borderline but acceptable for decorative hints; keep .45. I'll set ink-faint alpha .45.
The search icon color ink-faint.
Column bg #e9e4d4 vs page #f2eee3: subtle distinction ✓. Card #faf7ee pops on column bg ✓.
Dark: bg #171410, col #1e1a14, card #28221a ✓.
Accent button: light theme: bg #bf3f16, text #faf5ea ✓; hover darken via color-mix black.
`.btn-accent:hover{background:color-mix(in srgb, var(--accent) 85%, #000);}` in dark, mixing black into already-dark accent ok.
Focus styles: `:focus-visible{outline:2px solid var(--accent); outline-offset:2px;}` — global. Cards not focusable (draggable but no tabindex) — fine.
Let me also add `touch-action` stuff? Not needed.
Alright — also ensure the page doesn't start with an `#` heading and I output only the code block. Response format: single fenced ```html block only.
Now write CSS completely, then JS, mentally compiling for errors.
Detailed CSS:
```css
:root{ ...light vars... }
html[data-theme="dark"]{ ...dark vars... }
*{box-sizing:border-box}
html,body{margin:0;padding:0}
html{height:100%}
body{
min-height:100%;
font-family:var(--serif);
color:var(--ink);
background-color:var(--bg);
background-image:radial-gradient(var(--bg-dot) 1px,transparent 1.3px);
background-size:24px 24px;
-webkit-font-smoothing:antialiased;
overflow-x:hidden;
}
::selection{background:var(--accent);color:var(--accent-contrast)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.app{max-width:1300px;margin:0 auto;padding:22px 26px 10px;display:flex;flex-direction:column;min-height:100vh}
```
min-height 100vh with footer at bottom? board won't fill; footer after board — fine. To pin footer bottom when content short: `.app{min-height:100vh} .board{flex:1}`? board flex:1 grows, columns stretch tall — actually nice: columns fill viewport height. With 6 cards, columns fill remaining height — looks composed. But super-tall empty space? At 800 height, header ~90, footer ~40 → board ~640px tall columns with 2-3 cards each + empty space below cards. Could look sparse... but gives a "board" feel with room to drop. I think full-height columns look intentional and elegant. Hmm, but the empty bottom area of each column with just dot pattern bg... The col-list is-empty ::after etc. I'd rather have columns size to content-ish but equal height: use align-items:start on grid? Then each column height = its own content — unequal, ragged. Equal stretch = max content height among columns. With todo 3 cards ~ tallest. That's tidy. So: `.board{align-items:start}` + `.column{...}` no flex:1... but then empty columns (after filtering/deleting all) shrink to header only ~ 40px — drop target small. Give `.col-list{min-height:140px}`. OK: columns equal to tallest sibling via stretch default (grid default stretch) — keep default stretch, don't set flex on board. Remove min-height:100vh flex to avoid huge empty space? With stretch, board height = tallest column ≈ content. Good balance. But when all columns short, page short — fine, footer near top? Footer right after board — okay.
Hmm, but I kind of like the app filling the viewport. Let me compromise: `.app{min-height:100vh}` and `.board{flex:1}` but cap: columns would stretch full viewport height. At 1280×800 the board fills ~660px — cards occupy upper ~230px, rest empty dotted column space. It looks like a real kanban with breathing room (like Trello empty column space). I think it looks good and "board-like". Trello fills height. Let's do flex:1 on board. And `.col-list{flex:1}` so empty-state messages center in the leftover space. I'll go with full-height — more app-like.
At small screens (375), 3 stacked columns each min-height 120 list — page scrolls; fine.
Topbar:
```css
.topbar{display:flex;align-items:flex-end;justify-content:space-between;gap:18px;padding:4px 2px 20px;flex-wrap:wrap}
.brand{min-width:0}
.brand-name{margin:0;font:italic 400 34px/1 var(--serif);letter-spacing:.01em}
.brand-dot{color:var(--accent);font-style:normal}
.brand-sub{margin:7px 0 0;font:400 10.5px/1 var(--mono);letter-spacing:.16em;text-transform:uppercase;color:var(--ink-faint)}
.controls{display:flex;align-items:center;gap:10px;flex-wrap:wrap;justify-content:flex-end}
```
Brand-name 34px italic serif "Index." — the dot in accent. Sub in mono uppercase.
Search:
```css
.search{display:flex;align-items:center;gap:8px;height:38px;padding:0 10px;background:var(--card-bg);border:1px solid var(--line);border-radius:9px;width:250px;max-width:100%;transition:border-color .15s, box-shadow .15s}
.search:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 16%,transparent)}
.search svg{flex:none;width:14px;height:14px;color:var(--ink-faint)}
.search input{flex:1;min-width:0;border:0;outline:0;background:transparent;font:400 12px/1 var(--mono);letter-spacing:.02em;color:var(--ink)}
.search input::placeholder{color:var(--ink-faint)}
.search-clear{flex:none;display:flex;align-items:center;justify-content:center;width:20px;height:20px;border:0;border-radius:5px;background:transparent;color:var(--ink-faint);cursor:pointer;opacity:0;pointer-events:none;transition:opacity .15s,color .15s,background .15s;padding:0}
.search.has-value .search-clear{opacity:1;pointer-events:auto}
.search-clear:hover{color:var(--ink);background:color-mix(in srgb,var(--ink) 8%,transparent)}
.search-clear svg{width:10px;height:10px}
```
Icon button:
```css
.icon-btn{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;border:1px solid var(--line);border-radius:9px;background:transparent;color:var(--ink-soft);cursor:pointer;transition:color .15s,border-color .15s,background .15s;padding:0}
.icon-btn:hover{color:var(--ink);border-color:var(--line-strong)}
.icon-btn svg{width:16px;height:16px}
.icon-btn.spin svg{animation:spin .45s cubic-bezier(.3,.7,.3,1)}
@keyframes spin{to{transform:rotate(180deg)}}
html[data-theme="light"] .icon-sun{display:none}
html[data-theme="dark"] .icon-moon{display:none}
```
Buttons:
```css
.btn{display:inline-flex;align-items:center;gap:8px;height:38px;padding:0 15px;border-radius:9px;border:1px solid transparent;font:700 10.5px/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;cursor:pointer;transition:background .15s,color .15s,border-color .15s,transform .1s}
.btn:active{transform:translateY(1px)}
.btn svg{width:12px;height:12px}
.btn-accent{background:var(--accent);color:var(--accent-contrast)}
.btn-accent:hover{background:color-mix(in srgb,var(--accent) 82%,#000)}
.btn-ghost{background:transparent;border-color:var(--line);color:var(--ink-soft)}
.btn-ghost:hover{border-color:var(--line-strong);color:var(--ink)}
```
Board & columns:
```css
.board{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;flex:1;align-items:stretch}
.column{display:flex;flex-direction:column;background:var(--col-bg);border:1px solid var(--line);border-radius:12px;border-top:3px solid var(--col-c);transition:background .15s, box-shadow .15s, outline-color .15s}
.column[data-col="todo"]{--col-c:var(--col-a)}
.column[data-col="progress"]{--col-c:var(--col-b)}
.column[data-col="done"]{--col-c:var(--col-c2)}
```
Hmm naming: I defined --col-a/b/c earlier; cleaner: --tone-todo etc. Let me define per-theme:
```
--tone-todo:#94876b; --tone-progress:var(--accent-ish); --tone-done:var(--low);
```
Light: todo #94886c, progress #bf3f16, done #42704f. Dark: #857c62, #e0642f, #7bab8a. Simplify by mapping done tone to var(--low), progress to var(--accent). And todo a muted khaki var(--tone-a). So vars: --tone-a per theme; then:
```css
.column[data-col="todo"]{--col-c:#94886b}
.column[data-col="progress"]{--col-c:var(--accent)}
.column[data-col="done"]{--col-c:var(--low)}
html[data-theme="dark"] .column[data-col="todo"]{--col-c:#8a8069}
```
Good.
Continue:
```css
.col-head{display:flex;align-items:center;gap:9px;padding:12px 12px 11px;border-bottom:1px solid var(--line)}
.col-name{margin:0;font:700 11px/1 var(--mono);letter-spacing:.18em;text-transform:uppercase;color:var(--ink);flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.col-count{min-width:24px;height:22px;padding:0 7px;display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--line);border-radius:7px;background:color-mix(in srgb,var(--ink) 5%,transparent);font:700 11.5px/1 var(--mono);color:var(--ink-soft);letter-spacing:.02em}
.col-count.pop{animation:pop .35s cubic-bezier(.34,1.56,.64,1)}
@keyframes pop{0%{transform:scale(1)}45%{transform:scale(1.28);background:color-mix(in srgb,var(--accent) 22%,transparent);border-color:color-mix(in srgb,var(--accent) 50%,transparent)}100%{transform:scale(1)}}
.col-add{flex:none;display:inline-flex;align-items:center;justify-content:center;width:22px;height:22px;border:0;border-radius:6px;background:transparent;color:var(--ink-faint);cursor:pointer;transition:color .15s,background .15s;padding:0}
.col-add:hover{color:var(--accent);background:var(--accent-soft)}
.col-add svg{width:12px;height:12px}
.col-list{flex:1;display:flex;flex-direction:column;gap:10px;padding:10px;min-height:130px}
.col-list::after{content:none}
.col-list.is-empty::after{content:"No cards yet — drop one in";display:flex;align-items:center;justify-content:center;flex:1;margin:2px;min-height:52px;border:1.5px dashed var(--line);border-radius:9px;padding:14px 12px;font:400 11px/1.5 var(--mono);letter-spacing:.05em;color:var(--ink-faint);text-align:center}
.col-list.no-match::after{content:"Nothing matches the filter here";display:flex;...same...}
```
Two rules duplicating styles — combine: `.col-list.is-empty::after,.col-list.no-match::after{ (common styles) }` then separate content rules:
```css
.col-list.is-empty::after,.col-list.no-match::after{display:flex;align-items:center;justify-content:center;flex:1;margin:2px;min-height:52px;border:1.5px dashed var(--line);border-radius:9px;padding:14px 12px;font:400 11px/1.5 var(--mono);letter-spacing:.05em;color:var(--ink-faint);text-align:center}
.col-list.is-empty::after{content:"No cards yet — drop one in"}
.col-list.no-match::after{content:"Nothing matches the filter here"}
.column.over .col-list::after{display:none}
```
Column drag-over:
```css
.column.over{outline:2px dashed var(--accent);outline-offset:-2px;background:color-mix(in srgb,var(--accent) 5%,var(--col-bg))}
```
Card:
```css
.card{position:relative;background:var(--card-bg);border:1px solid var(--line);border-radius:9px;padding:11px 13px 10px;cursor:grab;box-shadow:var(--card-sh);transition:transform .16s ease,box-shadow .16s ease,border-color .16s ease,opacity .16s ease;user-select:none}
.card:hover{transform:translateY(-2px);box-shadow:var(--card-sh-hover);border-color:var(--line-strong)}
.card:active{cursor:grabbing}
.card.drag-hidden{display:none}
.card.is-filtered{display:none}
.card-title{margin:0 22px 0 0;font:400 15.5px/1.4 var(--serif);letter-spacing:.005em;color:var(--ink);overflow-wrap:anywhere}
.card-meta{display:flex;align-items:center;gap:8px;margin-top:9px}
.card-no{margin-left:auto;font:400 9.5px/1 var(--mono);letter-spacing:.16em;color:var(--ink-faint)}
.card-del{position:absolute;top:7px;right:7px;width:22px;height:22px;display:flex;align-items:center;justify-content:center;border:0;border-radius:6px;background:transparent;color:var(--ink-faint);cursor:pointer;opacity:.5;transition:opacity .15s,color .15s,background .15s;padding:0}
.card:hover .card-del,.card-del:focus-visible{opacity:1}
.card-del:hover{color:var(--high);background:color-mix(in srgb,var(--high) 12%,transparent)}
.card-del svg{width:10px;height:10px}
```
Drag image clone:
```css
.drag-image{position:fixed;left:-12000px;top:0;pointer-events:none;transform:rotate(2.2deg) scale(1.03);box-shadow:0 24px 48px -16px rgba(20,14,6,.5);border-color:var(--line-strong);cursor:grabbing;margin:0}
```
The clone also retains .card class → position:relative overridden by .drag-image fixed (later rule specificity: .drag-image single class same specificity as .card — order matters; put .drag-image after .card rules. transform on .drag-image vs .card:hover transform — clone isn't hovered. ok.)
Phantom:
```css
.drop-phantom{flex:none;height:54px;border:1.5px dashed var(--accent);border-radius:9px;background:color-mix(in srgb,var(--accent) 7%,transparent);display:flex;align-items:center;justify-content:center;animation:phantom 1.1s ease-in-out infinite}
.drop-phantom::after{content:"drop here";font:700 9px/1 var(--mono);letter-spacing:.26em;text-transform:uppercase;color:var(--accent)}
@keyframes phantom{0%,100%{opacity:.55}50%{opacity:1}}
```
Animations:
```css
.card.entering{animation:card-in .34s cubic-bezier(.22,.9,.32,1) backwards}
@keyframes card-in{from{opacity:0;transform:translateY(8px) scale(.97)}}
.card.landing{animation:land .3s cubic-bezier(.2,.8,.3,1.35) backwards}
@keyframes land{from{transform:scale(1.045)}}
.card.is-removing{animation:card-out .18s ease both;pointer-events:none}
@keyframes card-out{to{opacity:0;transform:scale(.9)}}
```
Badges & mark:
```css
.badge{display:inline-flex;align-items:center;gap:6px;padding:3.5px 8px 3px 9px;border-radius:999px;border:1px solid;font:700 9px/1 var(--mono);letter-spacing:.14em;text-transform:uppercase}
.badge-dot{width:5px;height:5px;border-radius:50%;background:currentColor;flex:none}
.badge-high{color:var(--high);border-color:color-mix(in srgb,var(--high) 42%,transparent);background:color-mix(in srgb,var(--high) 10%,transparent)}
.badge-medium{color:var(--medium);border-color:color-mix(in srgb,var(--medium) 42%,transparent);background:color-mix(in srgb,var(--medium) 10%,transparent)}
.badge-low{color:var(--low);border-color:color-mix(in srgb,var(--low) 42%,transparent);background:color-mix(in srgb,var(--low) 10%,transparent)}
mark{background:var(--mark);color:inherit;border-radius:2px;padding:0 1px}
```
Footer:
```css
.foot{display:flex;flex-wrap:wrap;gap:6px 0;align-items:center;justify-content:center;padding:16px 2px 10px;font:400 10px/1.6 var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--ink-faint)}
.dot-sep{margin:0 9px;color:var(--line-strong)}
```
Hmm text-transform uppercase for footer with "×" fine.
Overlay & modal:
```css
.overlay{position:fixed;inset:0;z-index:50;display:flex;align-items:center;justify-content:center;padding:18px;background:var(--overlay);opacity:0;visibility:hidden;transition:opacity .18s ease,visibility 0s linear .18s;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}
.overlay.is-open{opacity:1;visibility:visible;transition:opacity .18s ease}
.modal{width:min(430px,100%);background:var(--card-bg);border:1px solid var(--line);border-radius:13px;box-shadow:0 30px 70px -18px rgba(10,7,2,.5);padding:20px 22px 18px;transform:translateY(10px) scale(.965);transition:transform .22s cubic-bezier(.2,.9,.3,1.15)}
.overlay.is-open .modal{transform:none}
.modal.shake{animation:shake .32s ease}
@keyframes shake{20%{transform:translateX(-6px)}40%{transform:translateX(5px)}60%{transform:translateX(-3px)}80%{transform:translateX(2px)}}
.modal-head{display:flex;align-items:center;gap:10px;margin-bottom:16px}
.modal-head h2{margin:0;font:italic 400 21px/1.1 var(--serif)}
.modal-x{margin-left:auto;width:28px;height:28px;...like icon-btn small}
.field{margin-bottom:15px}
.field-label{display:block;margin-bottom:7px;font:700 9.5px/1 var(--mono);letter-spacing:.16em;text-transform:uppercase;color:var(--ink-soft)}
.req{color:var(--high)}
.field-input{width:100%;background:transparent;border:0;border-bottom:2px solid var(--line);border-radius:0;padding:7px 1px 8px;font:400 16px/1.4 var(--serif);color:var(--ink);outline:none;transition:border-color .15s}
.field-input::placeholder{color:var(--ink-faint);font-style:italic}
.field-input:focus{border-color:var(--accent)}
.field-input.invalid{border-color:var(--high)}
.field-error{margin:7px 0 0;font:400 10.5px/1.4 var(--mono);letter-spacing:.04em;color:var(--high)}
.segmented{display:flex;border:1px solid var(--line);border-radius:9px;overflow:hidden;width:fit-content;max-width:100%}
.seg{appearance:none;-webkit-appearance:none;border:0;border-right:1px solid var(--line);background:transparent;padding:8px 13px 7px;font:700 9.5px/1 var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--ink-soft);cursor:pointer;transition:background .15s,color .15s,box-shadow .15s;white-space:nowrap}
.seg:last-child{border-right:0}
.seg:hover{background:color-mix(in srgb,var(--ink) 6%,transparent);color:var(--ink)}
.seg.is-on{color:var(--seg-c);background:color-mix(in srgb,var(--seg-c) 12%,transparent);box-shadow:inset 0 0 0 1.5px color-mix(in srgb,var(--seg-c) 60%,transparent)}
#colSeg .seg{--seg-c:var(--ink)}
#prioSeg .seg[data-val="low"]{--seg-c:var(--low)}
#prioSeg .seg[data-val="medium"]{--seg-c:var(--medium)}
#prioSeg .seg[data-val="high"]{--seg-c:var(--high)}
.modal-foot{display:flex;align-items:center;gap:10px;margin-top:20px}
.modal-hint{margin:0 auto 0 0;font:400 9.5px/1.5 var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--ink-faint);padding-right:10px}
.modal-foot .btn{height:36px}
```
Note `.modal-foot` order: hint, cancel, add — with hint margin-right auto. On narrow, hint may crowd — `@media (max-width:460px){.modal-hint{display:none}}`.
Toast:
```css
.toast{position:fixed;left:50%;bottom:24px;z-index:60;display:flex;align-items:center;gap:14px;padding:11px 12px 11px 16px;border-radius:10px;background:var(--toast-bg);color:var(--toast-ink);box-shadow:0 16px 40px -12px rgba(10,7,2,.45);font:400 12px/1.3 var(--mono);letter-spacing:.03em;transform:translate(-50%,10px);opacity:0;pointer-events:none;transition:transform .22s ease,opacity .22s ease;max-width:min(92vw,520px)}
.toast.show{transform:translate(-50%,0);opacity:1;pointer-events:auto}
.toast-msg{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.toast-undo{flex:none;border:0;background:transparent;padding:5px 4px;font:700 10px/1 var(--mono);letter-spacing:.16em;text-transform:uppercase;color:var(--toast-link);cursor:pointer;border-bottom:1px solid currentColor}
.toast-undo:hover{filter:brightness(1.15)}
```
toast-msg white-space nowrap with max-width — truncates long titles ✓.
Media queries:
```css
@media (max-width:940px){
.board{grid-template-columns:minmax(0,1fr)}
.col-list{min-height:100px}
}
@media (max-width:640px){
.app{padding:16px 14px 8px}
.topbar{padding-bottom:14px}
.brand-name{font-size:28px}
.search{width:100%;order:-1;flex:1 1 100%} /* search full width above buttons? */
.controls{width:100%;justify-content:space-between}
}
```
Hmm, controls flex-wrap: search (flex 1 1 100%) forces its own row; theme + add button row below, space-between. That's a decent mobile layout: search full-width, then [moon][New card] spread. Actually space-between with 2 items spreads them oddly; use gap and justify-end? Let me: `.controls{justify-content:flex-end}` default; at 640: `.controls{width:100%}` `.search{flex:1 1 auto;width:auto}` so search takes remaining space in same row as the two buttons — all three in one row: [search grows][theme][New card]. At 375: search min-width 0 shrinkable; theme 38 + add ~110 + gaps ~ 170 → search ~ 343-170-20 = 153px wide. OK! Nice single row. But brand above. Let me set: `@media(max-width:640px){ .topbar{...} .search{flex:1 1 auto;width:auto} }`. And brand-sub maybe hidden? Keep, it wraps fine.
Font of search input 12px mono — at 375 fine.
Also ensure `.controls` width 100%? Not needed if topbar wraps: brand full-ish then controls row. With flex-wrap on topbar, controls drop to next line and justify-flex-end. At 375, brand-sub 10.5px mono ls .16em "A TINY KANBAN FOR ONE BUSY HUMAN" ~ fits. ok.
Now reduced motion:
```css
@media (prefers-reduced-motion:reduce){
*,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important}
}
```
Note: phantom pulse stops — fine.
Also the theme transition helper:
```css
html.theming *,html.theming *::before,html.theming *::after{transition:background-color .35s ease,border-color .35s ease,color .35s ease,box-shadow .35s ease,fill .35s ease !important}
```
Now JS final. Write carefully:
```js
(function(){
'use strict';
/* ---------- dom refs ---------- */
const root = document.documentElement;
const $ = (s, c) => (c||document).querySelector(s);
const colDefs = [
{ id:'todo', label:'To do' },
{ id:'progress', label:'In progress' },
{ id:'done', label:'Done' }
];
const colEl = {}, listEl = {}, countEl = {};
colDefs.forEach(c => {
colEl[c.id] = $('.column[data-col="' + c.id + '"]');
listEl[c.id] = $('.col-list[data-list="' + c.id + '"]');
countEl[c.id] = $('.col-count[data-count="' + c.id + '"]');
});
```
Wait I need data-count attr in HTML: `<span class="col-count" data-count="todo">0</span>`. ✓
```js
/* ---------- state ---------- */
const cards = new Map();
const board = { todo: [], progress: [], done: [] };
let seq = 0;
function addSeed(title, priority, col){
seq++;
const id = 'c' + seq;
cards.set(id, { id, no: seq, title, priority });
board[col].push(id);
}
[
['Outline the Q3 product roadmap','high','todo'],
['Fix the layout shift on the pricing page','medium','todo'],
['Book a venue for the team offsite','low','todo'],
['Rebuild the onboarding email sequence','high','progress'],
['Refactor the date picker into a shared component','medium','progress'],
['Archive the 2019 marketing site','low','done']
].forEach(a => addSeed(a[0], a[1], a[2]));
```
Helpers:
```js
function esc(s){
return String(s).replace(/[&<>"']/g, ch => ({
'&':'&','<':'<','>':'>','"':'"',"'":'''
}[ch]));
}
function columnOf(id){
for (const c of colDefs) if (board[c.id].indexOf(id) !== -1) return c.id;
return null;
}
function pop(el){
el.classList.remove('pop');
void el.offsetWidth;
el.classList.add('pop');
}
```
Search state:
```js
let query = '';
const qTrim = () => query.trim().toLowerCase();
```
Highlight:
```js
function highlight(title, q){
const t = esc(title);
if (!q) return t;
const pattern = esc(q).replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
return t.replace(new RegExp('(' + pattern + ')', 'gi'), '<mark>$1</mark>');
}
```
buildCard:
```js
function buildCard(card){
const el = document.createElement('article');
el.className = 'card';
el.draggable = true;
el.dataset.id = card.id;
el.innerHTML =
'<button class="card-del" type="button" aria-label="Delete card" title="Delete card">' +
'<svg viewBox="0 0 12 12" aria-hidden="true"><path d="M2.2 2.2l7.6 7.6M9.8 2.2L2.2 9.8" stroke="currentColor" stroke-width="1.7" stroke-linecap="round"/></svg>' +
'</button>' +
'<h3 class="card-title"></h3>' +
'<div class="card-meta">' +
'<span class="badge badge-' + card.priority + '"><span class="badge-dot"></span>' + card.priority + '</span>' +
'<span class="card-no">Nº ' + String(card.no).padStart(2, '0') + '</span>' +
'</div>';
$('.card-title', el).textContent = card.title;
$('.card-del', el).addEventListener('click', () => removeCard(card.id));
el.addEventListener('dragstart', onDragStart);
el.addEventListener('dragend', onDragEnd);
return el;
}
```
Nº char: use 'Nº' directly in string (file is UTF-8) — fine: `'Nº '`. Keep literal char.
renderAll:
```js
function renderAll(boot){
colDefs.forEach(c => {
listEl[c.id].innerHTML = '';
board[c.id].forEach((id, i) => {
const el = buildCard(cards.get(id));
if (boot){
el.classList.add('entering');
el.style.animationDelay = (i * 55) + 'ms';
}
listEl[c.id].appendChild(el);
});
});
applyFilter();
}
```
applyFilter:
```js
function applyFilter(){
const q = qTrim();
document.querySelectorAll('.col-list .card').forEach(el => {
const card = cards.get(el.dataset.id);
const visible = !q || card.title.toLowerCase().indexOf(q) !== -1;
el.classList.toggle('is-filtered', !visible);
$('.card-title', el).innerHTML = highlight(card.title, visible ? q : '');
});
updateCounts();
}
```
updateCounts:
```js
function updateCounts(){
const q = qTrim();
colDefs.forEach(c => {
const total = board[c.id].length;
const visible = q
? board[c.id].filter(id => cards.get(id).title.toLowerCase().indexOf(q) !== -1).length
: total;
const text = q ? visible + '/' + total : String(total);
if (countEl[c.id].textContent !== text){
countEl[c.id].textContent = text;
pop(countEl[c.id]);
}
const list = listEl[c.id];
list.classList.toggle('is-empty', total === 0);
list.classList.toggle('no-match', total > 0 && visible === 0 && !!q);
});
}
```
Remove card + undo:
```js
let lastDeleted = null;
function removeCard(id){
const col = columnOf(id);
if (!col) return;
const idx = board[col].indexOf(id);
board[col].splice(idx, 1);
lastDeleted = { id, col, idx };
const el = document.querySelector('.card[data-id="' + id + '"]');
if (el){
el.classList.add('is-removing');
setTimeout(() => el.remove(), 200);
}
updateCounts();
const title = cards.get(id).title;
showToast('“' + (title.length > 30 ? title.slice(0, 30) + '…' : title) + '” deleted');
}
function undoDelete(){
if (!lastDeleted) return;
const { id, col, idx } = lastDeleted;
lastDeleted = null;
const at = Math.min(idx, board[col].length);
board[col].splice(at, 0, id);
hideToast();
const list = listEl[col];
const next = list.children[at] || null; // careful: children include phantom? phantom removed.
const el = buildCard(cards.get(id));
el.classList.add('entering');
list.insertBefore(el, next);
applyFilter();
}
```
Hmm insert before the nth child: list children are cards only (phantom absent). `list.children[at]` ✓. But if filtered, inserted card may be immediately hidden by applyFilter — fine.
Note: undo keeps card in `cards` map — removeCard doesn't delete from map ✓ (needed for undo). Memory only anyway.
Toast:
```js
const toast = $('#toast'), toastMsg = $('#toastMsg'), toastUndo = $('#toastUndo');
let toastTimer = null;
function showToast(msg){
toastMsg.textContent = msg;
toast.classList.add('show');
clearTimeout(toastTimer);
toastTimer = setTimeout(hideToast, 4200);
}
function hideToast(){
toast.classList.remove('show');
clearTimeout(toastTimer);
}
toastUndo.addEventListener('click', undoDelete);
```
Drag & drop:
```js
let dragEl = null, ghostEl = null;
const phantom = document.createElement('div');
phantom.className = 'drop-phantom';
function onDragStart(e){
dragEl = e.currentTarget;
e.dataTransfer.effectAllowed = 'move';
try { e.dataTransfer.setData('text/plain', dragEl.dataset.id); } catch(err){}
const rect = dragEl.getBoundingClientRect();
ghostEl = dragEl.cloneNode(true);
ghostEl.classList.add('drag-image');
ghostEl.classList.remove('entering','landing','is-removing');
ghostEl.style.width = rect.width + 'px';
document.body.appendChild(ghostEl);
try { e.dataTransfer.setDragImage(ghostEl, Math.round(rect.width / 2), 18); } catch(err){}
setTimeout(() => { if (dragEl) dragEl.classList.add('drag-hidden'); }, 0);
dragEl.parentNode.insertBefore(phantom, dragEl);
}
function onDragEnd(){
finishDrag();
}
function finishDrag(){
if (dragEl){
dragEl.classList.remove('drag-hidden');
dragEl = null;
}
phantom.remove();
if (ghostEl){ ghostEl.remove(); ghostEl = null; }
colDefs.forEach(c => colEl[c.id].classList.remove('over'));
}
function afterElement(list, y){
let best = null, bestOff = -Infinity;
list.querySelectorAll('.card:not(.drag-hidden):not(.is-filtered)').forEach(el => {
const box = el.getBoundingClientRect();
const off = y - box.top - box.height / 2;
if (off < 0 && off > bestOff){ bestOff = off; best = el; }
});
return best;
}
colDefs.forEach(c => {
const col = colEl[c.id], list = listEl[c.id];
col.addEventListener('dragover', e => {
if (!dragEl) return;
e.preventDefault();
if (e.dataTransfer) e.dataTransfer.dropEffect = 'move';
colDefs.forEach(x => colEl[x.id].classList.toggle('over', x.id === c.id));
const after = afterElement(list, e.clientY);
if (after) list.insertBefore(phantom, after);
else list.appendChild(phantom);
});
col.addEventListener('drop', e => {
if (!dragEl) return;
e.preventDefault();
const dropped = dragEl;
list.insertBefore(dropped, phantom);
dropped.classList.add('landing');
setTimeout(() => { dropped.classList.remove('landing'); }, 350);
finishDrag();
syncFromDOM();
});
});
document.addEventListener('dragover', e => {
if (!dragEl) return;
if (!e.target.closest('.column')) colDefs.forEach(c => colEl[c.id].classList.remove('over'));
e.preventDefault();
});
document.addEventListener('drop', e => e.preventDefault());
```
Wait, careful: `document.addEventListener('dragover', e=>{... e.preventDefault();})` — always preventDefault, even when dragEl null (external drags) — fine.
But subtle: when NOT over a column, I clear 'over'. When over a column, the column handler sets it. Both fire. ✓.
But also — clearing 'over' class when moving over header of the SAME column? header is inside column → closest('.column') non-null → keep. ✓
One more: `e.target.closest` — e.target could be a text node? In dragover events target is an element. SVG elements have closest ✓. `document` target possible (if pointer over e.g. scrollbar?) — document has no closest → would throw! Guard: `if (!(e.target instanceof Element)) return;`? Actually when dragging over document root, target is document element (html) which is an Element. e.target for dragover over the page is html or an element. If e.target === document? Possible in edge cases (drag over to edge?). Safer:
```js
const t = e.target;
const inCol = t && t.closest && t.closest('.column');
```
Use that guard.
syncFromDOM:
```js
function syncFromDOM(){
colDefs.forEach(c => {
board[c.id] = Array.prototype.map.call(
listEl[c.id].querySelectorAll('.card'),
el => el.dataset.id
);
});
updateCounts();
}
```
Note: at this moment dragged card is in the list & visible ✓, phantom removed ✓.
Wait order in drop handler: `list.insertBefore(dropped, phantom); finishDrag(); syncFromDOM();` — finishDrag removes phantom & unhides ✓. But careful: if phantom is NOT currently inside this list (e.g., drop fired on column without prior dragover inserting phantom? dragover must have fired before drop to allow it; dragover handler inserts phantom into that list. So phantom is in the drop list. But safe-guard: if phantom.parentNode !== list, just append dropped: `if (phantom.parentNode === list) list.insertBefore(dropped, phantom); else list.appendChild(dropped);` Add that.
Search wiring:
```js
const searchWrap = $('#searchWrap'), searchInput = $('#searchInput'), searchClear = $('#searchClear');
searchInput.addEventListener('input', () => {
query = searchInput.value;
searchWrap.classList.toggle('has-value', searchInput.value.length > 0);
applyFilter();
});
searchClear.addEventListener('click', () => {
searchInput.value = '';
query = '';
searchWrap.classList.remove('has-value');
applyFilter();
searchInput.focus();
});
```
Modal:
```js
const overlay = $('#overlay'), modal = $('#modal'), form = $('#cardForm');
const titleInput = $('#fTitle'), titleError = $('#fTitleError');
const prioSeg = $('#prioSeg'), colSeg = $('#colSeg');
let selPriority = 'medium', selColumn = 'todo', returnFocus = null;
function setSeg(container, val){
container.querySelectorAll('.seg').forEach(b => b.classList.toggle('is-on', b.dataset.val === val));
}
function wireSeg(container, setter){
container.addEventListener('click', e => {
const btn = e.target.closest('.seg');
if (!btn) return;
setSeg(container, btn.dataset.val);
setter(btn.dataset.val);
});
}
wireSeg(prioSeg, v => { selPriority = v; });
wireSeg(colSeg, v => { selColumn = v; });
function openModal(colId){
if (colId) selColumn = colId;
setSeg(colSeg, selColumn);
setSeg(prioSeg, selPriority);
titleInput.value = '';
titleInput.classList.remove('invalid');
titleError.hidden = true;
modal.classList.remove('shake');
overlay.classList.add('is-open');
overlay.setAttribute('aria-hidden', 'false');
setTimeout(() => titleInput.focus(), 50);
}
function closeModal(){
overlay.classList.remove('is-open');
overlay.setAttribute('aria-hidden', 'true');
if (returnFocus){ returnFocus.focus(); returnFocus = null; }
}
$('#addBtn').addEventListener('click', () => { returnFocus = $('#addBtn'); openModal(); });
document.querySelectorAll('.col-add').forEach(btn => {
btn.addEventListener('click', () => { returnFocus = btn; openModal(btn.dataset.addcol); });
});
$('#modalClose').addEventListener('click', closeModal);
$('#cancelBtn').addEventListener('click', closeModal);
overlay.addEventListener('mousedown', e => { if (e.target === overlay) closeModal(); });
```
Use mousedown on backdrop? Click is fine; but dragstart from modal? click ok. Actually a subtle issue: text selection inside modal then release outside... rare. Use 'click'.
Hmm, use click:
```js
overlay.addEventListener('click', e => { if (e.target === overlay) closeModal(); });
```
Escape + trap:
```js
document.addEventListener('keydown', e => {
if (e.key === 'Escape' && overlay.classList.contains('is-open')) closeModal();
});
modal.addEventListener('keydown', e => {
if (e.key !== 'Tab') return;
const items = Array.prototype.filter.call(
modal.querySelectorAll('button, input'),
el => el.offsetParent !== null
);
if (!items.length) return;
const first = items[0], last = items[items.length - 1];
if (e.shiftKey && document.activeElement === first){ e.preventDefault(); last.focus(); }
else if (!e.shiftKey && document.activeElement === last){ e.preventDefault(); first.focus(); }
});
```
Form submit:
```js
form.addEventListener('submit', e => {
e.preventDefault();
const title = titleInput.value.trim();
if (!title){
titleInput.classList.add('invalid');
titleError.hidden = false;
modal.classList.remove('shake'); void modal.offsetWidth; modal.classList.add('shake');
titleInput.focus();
return;
}
createCard(title, selPriority, selColumn);
closeModal();
});
titleInput.addEventListener('input', () => {
if (titleInput.classList.contains('invalid')){
titleInput.classList.remove('invalid');
titleError.hidden = true;
}
});
```
createCard:
```js
function createCard(title, priority, col){
seq++;
const id = 'c' + seq;
cards.set(id, { id, no: seq, title, priority });
board[col].unshift(id);
const el = buildCard(cards.get(id));
el.classList.add('entering');
listEl[col].insertBefore(el, listEl[col].firstChild);
applyFilter();
}
```
Wait — but empty state ::after: if list was empty, ::after content shows when is-empty class present; updateCounts in applyFilter removes class ✓.
listEl firstChild — but if list empty, firstChild is the ::after? No, pseudo elements aren't child nodes. If empty list: firstChild null → append ✓ via insertBefore(el, null) = append. ✓
But hold on: does the "New card" flow via createCard skip renderAll — good (no re-render needed). But modal's column selection: if the selected column differs, fine.
Theme:
```js
const themeBtn = $('#themeBtn');
themeBtn.addEventListener('click', () => {
const dark = root.dataset.theme === 'dark';
root.dataset.theme = dark ? 'light' : 'dark';
themeBtn.setAttribute('aria-label', dark ? 'Switch to dark theme' : 'Switch to light theme');
themeBtn.classList.remove('spin'); void themeBtn.offsetWidth; themeBtn.classList.add('spin');
root.classList.add('theming');
setTimeout(() => root.classList.remove('theming'), 400);
});
```
Init:
```js
renderAll(true);
updateCounts(); // renderAll → applyFilter → updateCounts already
```
Wait, one bug check in renderAll: `el.style.animationDelay = (i*55)+'ms'` — per column restarts i at 0, so cards in different columns animate simultaneously in waves — actually nice cascade per column. Or global index across all columns: compute running index. Either fine; per-column looks fine. But animationDelay lingering inline style after boot — the entering class removed? Not removed. Later if I add 'landing' to a card that still has 'entering' + animationDelay inline... boot cards keep 'entering' class forever (animation done, fill backwards → no lingering effect). When drag lands, I add 'landing' — element now has two animation classes? CSS: `.card.entering{animation:card-in...}` and `.card.landing{animation:land...}` — both set `animation` property; the more specific/later rule wins entirely (one animation). .landing defined after .entering in CSS → land wins while both classes present. After removing 'landing', 'entering' animation would RE-RUN (animation property re-applied)! That causes a flicker on the moved card. Fix: remove 'entering' class after boot: in renderAll, after append, `setTimeout(()=>{ el.classList.remove('entering'); el.style.animationDelay=''; }, 900 + i*55)`. Simpler: setTimeout 1200 fixed for all boot cards. Do:
```js
if (boot){
el.classList.add('entering');
el.style.animationDelay = (i * 55) + 'ms';
setTimeout(((node) => () => { node.classList.remove('entering'); node.style.animationDelay = ''; })(el), 1000);
}
```
Need closure per element — use let in loop? forEach param el is per-iteration scope ✓ (arrow function per iteration). So `setTimeout(() => { el.classList.remove('entering'); el.style.animationDelay=''; }, 1000);` — el captured per iteration ✓.
Similarly createCard's entering: setTimeout remove after 600ms. And undo: remove after 600ms. Add helper `animateIn(el, delay)`:
```js
function animateIn(el, delay){
el.classList.add('entering');
if (delay) el.style.animationDelay = delay + 'ms';
setTimeout(() => { el.classList.remove('entering'); el.style.animationDelay = ''; }, (delay || 0) + 450);
}
```
Use in boot (with per-card delay), createCard, undoDelete.
Similarly 'landing' removal handled with timeout ✓.
Edge: 'landing' class + then hover transform: land uses fill backwards → after animation, transform from hover applies ✓ (during 350ms, hover transform overridden by animation — trivial).
Also: cards with 'entering' during boot + user drags within 1s? class removed at 1s; if drag lands before removal, we add 'landing' (later rule wins), and the earlier timeout later removes 'entering' ✓ no re-run of card-in? Removing 'entering' removes its animation declaration — 'landing' may still be present if within 350ms... after landing's own removal, no animation classes → natural. OK. And potential re-trigger of card-in when 'landing' removed while 'entering' still present? Sequence: t=0.3s land card (landing added, entering still there until 1s). t=0.65 landing removed → animation property goes from `.landing` rule to `.entering` rule → card-in RE-RUNS! Visible flicker mid-drag... rare (user drags within 1 second of load). Acceptable? It'd re-play card-in (fade+rise) on the dropped card — mildly noticeable if it happens. Mitigate: when adding landing, also remove 'entering' first:
```js
dropped.classList.remove('entering'); dropped.style.animationDelay='';
dropped.classList.add('landing');
```
✓ do that in drop handler. Similarly remove 'entering' in dragstart? Not needed.
Another subtle: `.card.is-removing` with `both` fill freezes opacity 0 — we remove node at 200ms; animation 180ms ✓.
Now check: `afterElement` excludes `.is-filtered` ✓ and drag-hidden ✓ (hidden ones have no rect anyway).
Phantom height 54 vs card heights vary (~64-80). Fine.
What about dragover firing before dragstart's timeout hides the card — dragover requires mouse move which happens after timeout? Actually the timeout(0) executes when the stack clears — mousemove events could theoretically fire before? dragstart → browser starts drag loop; the first dragover comes after some movement; the 0ms timeout runs long before. ✓
Also: `dragEl.parentNode.insertBefore(phantom, dragEl)` — if the source list is empty?? Can't be; card is in it. ✓
Now — setDragImage ghost: the clone includes `card-del` button with `position:absolute` — inside ghost, fine. The clone also has inline style width set. Also clone's `draggable="true"` — irrelevant. Also ghost inherits `.card` box-shadow hover? no hover. Ghost background uses var colors — ghost is in body, theme vars still apply ✓.
But: ghost clone of a card that has `is-filtered`? Can't drag filtered (display none). ✓
Also — `ghostEl.classList.remove('entering','landing','is-removing')` — clone could carry entering (boot) — removing ✓.
Another important check: cloned node's `card-del` click listener not cloned (listeners aren't cloned) ✓.
Also drag image shows the ghost INCLUDING possibly stale state — fine.
data-id duplication: ghost has same data-id as source. removeCard uses `document.querySelector('.card[data-id=...]')` which returns the FIRST match in document order — ghost appended to body end, source card in list earlier → source comes first in document order ✓ (board precedes body-appended ghost). But during drag user can't click delete anyway. ✓. And buildCard lookups in createCard/undo use fresh elements. `undoDelete` uses buildCard, not querySelector ✓.
Toast truncation: fine.
Check `columnOf` when called after board splice — removeCard computes col before splice ✓.
Now, the col-add plus icon svg reused 3 times in HTML.
Let me also give the columns subtle different top border color (done above).
One more design consideration for the board header — maybe each column could also show a thin progress indicator? Overkill. Keep.
Let me reconsider the initial page: brand "Index." — is the name confusing with search? It's fine.
Actually, let me reconsider the name to something more kanban-ish: "Slat"? "Boardsheet"? "Kanban No. 1"? I'll keep "Index." — the Nº numbering ties into it nicely ("Nº 04" card numbers = index entries). Cohesive. ✓
Footer text: uppercase mono ls .1em: "DRAG CARDS ANYWHERE BETWEEN COLUMNS · × ON A CARD DELETES IT · NOTHING IS SAVED — THE BOARD LIVES IN MEMORY". Contains "×" char — in mono uppercase fine.
Hmm "×" render in the middle of uppercase text fine.
Modal hint: "new cards land on top of the column" uppercase mono.
Now let me also double check `.seg` white-space nowrap + container `width:fit-content` — on 375 modal (343-44 padding = ~300 wide), colSeg three buttons "TO DO / IN PROGRESS / DONE": approx widths at 9.5px mono uppercase ls .12em: TO DO ~ 6ch*~7px=45+26pad=~70; IN PROGRESS ~11ch ~77+26=103; DONE ~45+26=70 → total ~243 ✓ fits.
PrioSeg: LOW/MEDIUM/HIGH ~ 70/85/70=225 ✓.
OK.
Now — one more requirement re-read: "Add a card through a small modal form (title required), and delete a card with a button on it." ✓. "Drag and drop cards between columns with the mouse, with a clear visual drop indicator." ✓ phantom + column outline. "A search field that filters cards live by title." ✓. "A light / dark theme toggle." ✓. "State lives in memory only (no storage APIs)." ✓ no storage.
"Three columns ... each showing its card count." ✓ chip per column, updates.
"Pre-populated ... 6 realistic cards spread across the columns" ✓ 3/2/1.
"Each card has a title and a priority (low / medium / high) shown as a colored badge." ✓.
Also requirement: keyboard "Click or press a key to start" is for games only — N/A here. Good.
Zero console errors — let me scan: all IDs referenced must exist: searchWrap, searchInput, searchClear, themeBtn, addBtn, overlay, modal, cardForm, fTitle, fTitleError, prioSeg, colSeg, modalClose, cancelBtn, toast, toastMsg, toastUndo, board columns with data-col & col-list data-list & col-count data-count. I'll write HTML accordingly.
Also I use `$` helper defined before use ✓.
Potential null: `$('.col-count[data-count="todo"]')` ✓ exists.
In updateCounts, countEl textContent set. Initial HTML has "3","2","1" placeholders matching seeds — updateCounts would compute same text → no pop at load ✓ (text equal, skip). Actually renderAll→applyFilter→updateCounts runs; total matches → no pop ✓.
applyFilter at boot sets innerHTML for titles via highlight(title, '') = esc(title) — fine.
Also `void el.offsetWidth` in pop ✓.
Check: CSS `html[data-theme="dark"] .icon-moon{display:none}` — in dark show sun. Default (light) defined via `[data-theme="light"] .icon-sun{display:none}` but html always has data-theme (light initially) ✓.
The theme button initial aria-label "Switch to dark theme" ✓.
Edge: user presses Tab before clicking anything — focus nav works ✓.
What about clicking a card triggers dragstart? Only drag with mouse move ✓.
One more: the `.card` user-select:none — but title text selection for search copy? minor, keep for drag cleanliness. Actually let me allow select on title? Dragging text inside draggable element is intercepted by drag anyway. Keep user-select none.
Also add `-webkit-user-drag`? not needed.
iOS touch: HTML5 DnD no-op; page still fine.
Now — accessibility of count: aria-label per column "Cards in To do" — static label ok.
Let me also verify there's no horizontal scrollbar at 375: app padding 14, board 1 col; cards width auto; title overflow-wrap anywhere ✓; topbar wraps ✓. Search row: search flex with min-width 0? `.search input{min-width:0}` and `.search{max-width:100%}` ✓; addBtn "NEW CARD" ~100px + icon 12 + gap → ~110; theme 38; search gets remaining ~ 343-110-38-20 = 175 ✓. `.controls` could overflow if brand-sub? brand on its own row ✓.
At 640-940: topbar single row: brand ~260px, controls (search 250 + 38 + 110 + gaps 20) ~ 420 → total ~680+... at 700 viewport: 700-52 padding = 648 < 680 → wraps controls to second row, justify-end ✓ no overflow (flex-wrap).
`.controls{flex-wrap:wrap}` ✓. Also give `.search{flex:1 1 180px;max-width:280px;width:auto}` base? I set base width:250px fixed. On controls wrap, ok. At ≤640 I override to flex:1 1 auto;width:auto. Fine.
Now dark-theme dot grid and col-head borders — good.
Let me also think again about the phantom label color contrast in dark ✓ accent.
I think the design holds together. Let me also add tiny detail: card left edge priority stripe? The badge suffices; adding stripes would double-code priority — skip.
One more potential console warning: none.
Also `overlay` has aria-hidden true initially and `visibility:hidden` — buttons inside still in tab order? visibility:hidden removes from tab order ✓.
Alright — also the `entering` animation with `backwards` fill and inline delay ✓.
Let me now also double-check `.modal` transform transition vs `.overlay.is-open .modal{transform:none}` — modal default transform translateY(10px) scale(.965); open → none ✓.
The overlay backdrop-filter with visibility transition — ok.
Now write out everything in final form. Also add `lang="en"`.
Wait, one more: `document.addEventListener('dragover')` — inside iframe sandbox, dragging works normally ✓.
Also the initial `renderAll(true)` is at script bottom; DOM ready since script at body end ✓.
Potential issue — `.col-list` children order and undo insert position: `list.children[at]` where children are only cards — but what about the empty-state? pseudo ✓. But if phantom left inside list at undo time? Can't — no drag active while clicking toast (dragend fired). Unless drop happened and toast clicked later ✓ phantom removed.
Also `undoDelete` splice then insertBefore at children[at] — but if list contains cards plus... fine.
Let me also handle delete of card while its column list had is-empty false → after splice updateCounts sets is-empty if 0 ✓ ::after shows.
updateCounts toggles classes but doesn't remove old ones conflicting: is-empty and no-match mutually exclusive ✓.
Now — one more thought on `syncFromDOM` + filtered cards: cards hidden but still in DOM & board ✓ fine.
`columnOf` used by removeCard only.
Let me make sure delete works during active search for hidden card — can't click hidden ✓.
Finally, let me double check the `.drag-image` CSS: `.drag-image{position:fixed;...}` — but the element also has class `.card` whose `position:relative` — `.drag-image` rule later in stylesheet overrides ✓ (same specificity 0-1-0, later wins). Also `.card` box-shadow overridden by .drag-image's ✓ (later). transform: .card:hover transform would come from `.card:hover` (0-2-0) which beats `.drag-image` (0-1-0) — ghost isn't hovered so no issue. `.drag-image` transform rotate ✓.
But wait — `.card` has `transition: transform...`; ghost transform static ✓.
Ghost width set inline ✓; position fixed left -12000px top 0 — set via CSS class; inline width only ✓.
setDragImage coordinates (w/2, 18) — within element ✓.
Chrome quirk: setDragImage element must be visible (rendered) — off-screen fixed IS rendered (not display:none) ✓ standard technique.
Now, is there any chance the ghost's `user-select:none` interferes? no.
Write the final answer now. I'll assemble carefully, keeping code readable with comments. Also start the reply directly with the code block (no heading). Language: user wrote English → everything in English.
Let me write the full HTML file mentally checking syntax as I go... Also, keep `<style>` compact but organized with section comments.
One more check on CSS var `--tone` for todo column: `.column[data-col="todo"]{--col-c:#94886b}` but in dark override. ✓
Also — hmm, `.column{border-top:3px solid var(--col-c)}` and border-radius 12px: top corners with 3px colored border ✓ looks like a colored tab strip.
Also `.column.over` uses outline — outline over the 3px top border fine.
For the "over" state maybe also color the count chip? skip.
Double-check keyframes pop uses background/border changes mid-animation — animating background-color in keyframe with color-mix values — fine.
Final check of segment is-on for colSeg uses --seg-c: var(--ink): selected = ink bg tint 12% + inset ring + ink text — reads clearly.
Alright, also the `req` asterisk: `<span class="req">*</span>` — asterisk is a text char, fine (not emoji).
Also add `novalidate` to form so custom validation runs (required attr absent anyway; I handle manually) ✓.
Also maxlength 90 on title.
Toast quotes: use typographic “ ” in message ✓.
Edge: `showToast` while previous timer ✓ cleared.
Everything seems solid. Let me also quickly reconsider: does anything violate "no horizontal scrollbar at 1280×800"? Board max width 1300, padding 26 → content 1248; 3 columns ~400 each ✓.
App min-height:100vh with flex; footer after board; board flex:1 → columns fill. ✓ At 800 height: header ~85, footer ~36, board ~640. Columns with 3 cards ~ 300px content + empty space. Empty state messages only for empty columns. Fine — the space reads as an intentional board.
Hmm wait — at boot, are columns' `is-empty`/`no-match` classes properly initialized? updateCounts toggles based on totals: none empty ✓.
One thing: with board flex:1 and columns stretching, `.col-list{flex:1}` — ✓.
Small nit: `.app{display:flex;flex-direction:column}` and `.board{flex:1}` — need board to also have min-height? Grid stretch handles.
Also body min-height 100%; app min-height:100vh — combine fine.
Let me write it all now. In the interest of completeness, also add `title` attributes where helpful.
Also I realize: search input font mono 12px — placeholder "Filter by title…" ✓.
Card count aria: `<span class="col-count" data-count="todo" aria-label="3 cards">`— dynamic aria updates skip; keep simple title attr? Use `aria-label="Card count"`? Just leave the number visible; add `title="Cards in this column"`. Fine.
Also the `col-add` buttons have `+` svg. Let me write svg plus: `<svg viewBox="0 0 12 12" aria-hidden="true"><path d="M6 1.5v9M1.5 6h9" stroke="currentColor" stroke-width="1.7" stroke-linecap="round" fill="none"/></svg>`.
Add button svg: viewBox 14: `M7 1.5v11M1.5 7h11`.
Search svg: `<svg viewBox="0 0 16 16" fill="none" aria-hidden="true"><circle cx="6.8" cy="6.8" r="4.8" stroke="currentColor" stroke-width="1.7"/><path d="M10.6 10.6l3.6 3.6" stroke="currentColor" stroke-width="1.7" stroke-linecap="round"/></svg>`.
Clear svg: `<svg viewBox="0 0 12 12" fill="none" aria-hidden="true"><path d="M2.5 2.5l7 7M9.5 2.5l-7 7" stroke="currentColor" stroke-width="1.6" stroke-linecap="round"/></svg>`.
Moon (24): `<svg class="icon-moon" viewBox="0 0 24 24" fill="none" aria-hidden="true"><path d="M12 3a6 6 0 0 0 9 9 9 9 0 1 1-9-9Z" stroke="currentColor" stroke-width="2" stroke-linejoin="round"/></svg>`.
Sun (24): `<svg class="icon-sun" viewBox="0 0 24 24" fill="none" aria-hidden="true"><circle cx="12" cy="12" r="4.2" stroke="currentColor" stroke-width="2"/><path d="M12 1.8v2.4M12 19.8v2.4M4.6 4.6l1.7 1.7M17.7 17.7l1.7 1.7M1.8 12h2.4M19.8 12h2.4M4.6 19.4l1.7-1.7M17.7 6.3l1.7-1.7" stroke="currentColor" stroke-width="2" stroke-linecap="round"/></svg>`.
Modal close: reuse small cross svg.
Ok. Also ensure svg default fill none where strokes used (set fill="none" attr on svg or paths).
Time to produce the final file. I'll be meticulous about matching IDs/classes between HTML, CSS, JS.
Structure of the final file:
1. doctype/head/style
2. body: .app (topbar, board, foot), overlay/modal, toast
3. script
Let me write the complete CSS in one pass (organized), then HTML, then JS.
Also, don't forget: html[data-theme="light"] initial in markup: `<html lang="en" data-theme="light">`.
Also add `<meta name="color-scheme" content="light dark">`? We manage via CSS color-scheme per theme; meta not needed.
Writing JS with `'use strict'` inside IIFE.
Also — I just want to double check `updateCounts` no-match condition `!!q` — q is qTrim() (lowercased string) ✓.
In applyFilter, for hidden cards I pass '' to highlight — clears stale <mark> ✓.
One more potential subtlety: `.card-title` innerHTML replaced by applyFilter on every keystroke — with mark wrapping ✓.
Let me also confirm the regex in highlight escapes properly: `pattern = esc(q).replace(/[.*+?^${}()|[\]\\]/g,'\\$&')`. esc(q) may contain `&` etc. — the ';' fine; '&','a','m','p' fine. If q contains '(' it stays '(' escaped for regex ✓. If title contains '<' → '<' — q '<' → '<' matches ✓. Case-insensitive flag ✓.
Edge: overlapping matches after escaping (e.g., q='amp' would match inside '&') — trivial edge, fine.
Also note `.replace(new RegExp(...), '<mark>$1</mark>')` — the pattern could contain '$' chars in q which after regex-escape are fine in pattern, but replacement string '<mark>$1</mark>' fixed ✓.
Now finalize. Also make sure no `#` heading start; begin with ```html.
Counting columns' initial HTML counts: todo 3, progress 2, done 1 (will be corrected by JS anyway).
Let me also do a final review pass for potential JS runtime errors:
- `colDefs.forEach` DOM lookups — elements exist (script after body content) ✓.
- `renderAll(true)` — calls applyFilter → updateCounts → countEl etc ✓.
- All event wiring inside IIFE ✓.
- `toastUndo` etc. fetched before use ✓.
The `finishDrag` also removes 'over' classes ✓ and ghost ✓.
`onDragEnd` → finishDrag — after successful drop, dragEl already null; phantom removed; over classes cleared (already cleared) ✓ idempotent.
Wait — in drop handler I call finishDrag() BEFORE syncFromDOM; finishDrag sets dragEl=null and removes classes; then syncFromDOM reads lists ✓. But note within finishDrag I `dragEl.classList.remove('drag-hidden')` then null ✓.
Also in drop handler I captured `dropped = dragEl` before finishDrag ✓.
Also add guard in drop: `if (phantom.parentNode === list) list.insertBefore(dropped, phantom); else list.appendChild(dropped);` ✓.
I'm confident. Also small extra: prevent cards' dragstart when target is the delete button? If user drags starting from delete button, card drags (weird but harmless). Could check in onDragStart: `if (e.target.closest('.card-del')) { e.preventDefault(); return; }` — prevents starting a card drag from the delete button. Nice touch, add it. Wait — does preventDefault on dragstart cancel the drag? Yes, dragstart preventDefault prevents drag operation. Add.
Similarly from nothing else needed.
Also, maybe prevent text drag from input? default fine.
Final: double-check `overlay click` closing when clicking inside modal — target would be modal or child, not overlay ✓.
Also add `role="status"` to toast; `aria-live` implicit polite ✓.
Let me write the file.
Actually one more consideration on `.search{width:250px}` in `.controls` — on ~700px the controls may wrap with search on row 2 — fine.
Also for `.topbar` at ≥640 keep as is.
Also ensure `.brand-name` uses lowercase "Index" with period accent — italic serif ✓.
Double check that footer dot-sep spans: `<span class="dot-sep">·</span>` — middot char fine.
Also the modal input placeholder: "e.g. Draft the changelog for v2.4" italic serif — nice.
Alright, writing final output now.
One last sanity check on grid `minmax(0,1fr)` at 941+ — 3 cols; at ≤940 1 col ✓.
Also `@media (max-width:940px)` maybe 2-col between 620 and 940 would look nicer on tablets... 1 col on tablet portrait is fine and cleaner. Keep simple.
Also, cards inside 400px column: title wraps fine.
Go.
Also remember: absolutely no text outside the code block.
Let me also compute total card height: padding 11+10, title ~22, meta 9+13 → ~65px; 3 cards + gaps ≈ 215 + header 45 + padding 20 ≈ 280px column content; board 640 → each column has ~360px empty space below cards. Hmm — that's a LOT of empty column space. Reconsider filling: maybe don't stretch columns full height; instead align-items:start with min-height on list ~160px → columns ~content height, board doesn't fill viewport, footer sits right below board, then empty page below with dot pattern. Which looks better for the screenshot? A board that ends mid-screen with footer under it, then blank paper — could look unfinished. Full-height columns look like a real app board. I'll keep stretch (flex:1). Trello-like. And the empty space inside columns is normal for kanban (room to grow). Also the footer pinned near bottom via app flex? Footer is after board — with board flex:1, footer lands at viewport bottom ✓ nice.
OK writing now.
During writing, I'll also include a `board` id unused maybe — fine.
Also: `main[hidden]`? no.
Also for `.app` padding-bottom small since footer has its own padding ✓.
Write everything:
```html
<!DOCTYPE html>
<html lang="en" data-theme="light">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Index — a tiny kanban</title>
<style>
/* ---------- theme tokens ---------- */
:root{
--serif:"Iowan Old Style","Palatino Linotype","Book Antiqua",Palatino,Georgia,"Times New Roman",serif;
--mono:ui-monospace,"SF Mono","Cascadia Mono","Segoe UI Mono",Menlo,Consolas,monospace;
color-scheme:light;
--bg:#f2eee3;
--bg-dot:rgba(46,38,26,.075);
--ink:#221c12;
--ink-soft:rgba(34,28,18,.64);
--ink-faint:rgba(34,28,18,.45);
--line:rgba(34,28,18,.16);
--line-strong:rgba(34,28,18,.36);
--col-bg:#e9e4d4;
--card-bg:#faf7ee;
--accent:#bf3f16;
--accent-soft:rgba(191,63,22,.09);
--accent-contrast:#faf5ea;
--mark:rgba(238,184,54,.55);
--high:#b13a17;
--medium:#8a6512;
--low:#42704f;
--card-sh:0 1px 2px rgba(40,32,18,.08),0 3px 10px -6px rgba(40,32,18,.14);
--card-sh-hover:0 2px 4px rgba(40,32,18,.08),0 12px 24px -10px rgba(40,32,18,.28);
--overlay:rgba(30,24,14,.46);
--toast-bg:#221c12;
--toast-ink:#f2eee3;
--toast-link:#f0a183;
}
html[data-theme="dark"]{
color-scheme:dark;
--bg:#171410;
--bg-dot:rgba(242,238,227,.05);
--ink:#ece5d3;
--ink-soft:rgba(236,229,211,.64);
--ink-faint:rgba(236,229,211,.42);
--line:rgba(236,229,211,.15);
--line-strong:rgba(236,229,211,.36);
--col-bg:#1e1a14;
--card-bg:#28221a;
--accent:#e0642f;
--accent-soft:rgba(224,100,47,.12);
--accent-contrast:#1c130b;
--mark:rgba(224,178,60,.32);
--high:#ef8557;
--medium:#d3ab55;
--low:#7bab8a;
--card-sh:0 1px 2px rgba(0,0,0,.35),0 4px 12px -6px rgba(0,0,0,.4);
--card-sh-hover:0 2px 6px rgba(0,0,0,.4),0 14px 28px -12px rgba(0,0,0,.55);
--overlay:rgba(8,6,3,.58);
--toast-bg:#ece5d3;
--toast-ink:#221c12;
--toast-link:#b0431a;
}
...
```
Then the rest of CSS as planned. Then HTML. Then JS.
Also add: `html.theming *,...{transition...}` rule.
Let me carefully produce the final code. I'll aim for clean formatting. Also add comments sparsely.
One more CSS piece — `.column[data-col="todo"]{--col-c:#94886b}` and dark override `html[data-theme="dark"] .column[data-col="todo"]{--col-c:#8a8069}`.
Also `.btn svg` sizing; `.icon-btn svg{width:15px;height:15px}`.
Everything set. Also verify: `.card-del` inside `.card` — but the clone (.drag-image) has .card-del visible — fine, part of snapshot.
For the toast role status and Undo.
Also — one more detail: when creating a card while a search filter is active and the new card doesn't match the filter, it will be hidden instantly — confusing? Toast? Minor; skip (typical apps do the same). Actually if filter active and user adds a matching card, shows ✓.
Also after createCard, maybe clear the search if hidden? Skip — fine.
Now writing final. Also I want to double check `.field-input.invalid` shake - error under. ✓
Also small: add `autofocus`? no (focus via open).
Also, `maxlength="90"` and `spellcheck="false"`? spellcheck default true fine.
Writing final answer now. Length ~450-550 lines. Ensure one code block only.
Also final scan against the "cheap tricks" list: no gradients (dot grid is a radial-gradient pattern for texture — hmm, it literally uses `radial-gradient(...)` CSS function. Is that "a decorative gradient"? The visual result is a dot pattern — not a gradient wash. I judge it acceptable as a texture; it's a well-known dotted-grid technique. To be extra safe, I could implement dots differently... `background-image: radial-gradient(circle at 1px 1px, var(--bg-dot) 1px, transparent 0)` — still radial-gradient function but visually dots. I'll keep it — it reads as paper texture, not a gradient. Alternatively drop it for pure flat color. The dots add craft; keep.
No emoji ✓ (× and · and “” and Nº are punctuation/typographic, fine; icons are inline SVG). No blue/purple ✓ (vermillion/ochre/green on paper). No cards-row uniformity issue — it's a kanban, columns are inherent. Typography: serif+mono identity, not Inter/Roboto ✓. No alert/confirm ✓ (toast + undo instead). Every control wired ✓.
Signature moment: the drag interaction (tilted lifted ghost card, pulsing "DROP HERE" phantom, column outline, count stamp pop) — memorable and functional.
Write it.