Claude Haiku 5.5

I'm planning a single self-contained Kanban board in vanilla HTML, CSS, and JS, returned as one fenced code block with nothing outside it. The requirements are three columns with counts, six starter cards with colored priority badges, a modal form to add cards with a required title, a delete button per card, and mouse-based drag and drop between columns.

I'm weighing HTML5 drag-and-drop against custom pointer events, and leaning toward pointer events because they give me a ghost card that follows the cursor and a placeholder marking the drop spot. I also still need to account for the search filter, light/dark toggle, in-memory state, and making the layout hold up at 375px wide.

I'm settling the layout now: a header with the title, search, theme toggle, and new-card button, then three columns that sit side by side on wider screens and stack vertically on narrow ones, so dragging between columns still works in that vertical arrangement.

Still working through the card and drop-indicator details, with the drag handling next.

I'm settling the drag mechanics: when a drag starts, the card gets a floating ghost copy and its spot is held by a placeholder of matching height, with the hidden original removed from the flow. As the pointer moves I'll track which column is under it to decide where the placeholder goes.

Now I'm working out how the drop placement will track the cursor: I'll find the column under the pointer, then compare the pointer's y-position against card midpoints to pick the insertion slot for the placeholder, moving it only when that slot changes. For empty columns it simply goes at the end. I'm also considering whether the column lists should scroll internally on desktop while stacking normally on mobile.

I'm sketching the drop logic now: on pointer release, the card's status and position get updated in the state array, and then the board re-renders from that state.

I'm settling on a simpler data model: a single cards array where each card carries its status. To move a card, I'll remove it from the array, set its new status, and reinsert it just before the card that follows the placeholder in the target column, or at the end of that column's cards if there is none.

Now I'm settling how the state gets updated on drop: I'll pull the card out of the array, set its new status, and reinsert it before the card it lands ahead of, or after the last card in the target column if there isn't one. Then the board re-renders from state. Since the cards are rebuilt on each render, I'll just keep the rendering simple, and I still need to decide whether the column counts show totals or filtered numbers.

I'm working out how the counts and search will interact: the column badges will show the total normally, and switch to a matched-of-total form while a query is active. Search will live-filter the cards with the matching text highlighted, and each column will show a "No cards" or "No matches" placeholder when it's empty.

I'm settling the delete behavior and deciding whether to add a small toast for add, delete, and move actions, leaning toward a brief message that fades after about two seconds. I'm also choosing the default theme for the light/dark toggle, which I'll handle with CSS variables on the root element.

I'm settling the priority badge colors: low in green, medium in amber, and high in red, each defined so they read well in both the light and dark themes.

I'm choosing the badge colors and seeding six starter cards, deciding which go under To do, In progress, and Done and what priority each gets.

I'm now deciding the modal's fields: a required title, priority picked from chips or a select, and a column choice, with Cancel and Add card buttons, and I'm leaning toward a native dialog for Escape handling and focus.

I'm choosing between a radio group styled as chips and a plain select for the priority field, leaning toward chips for the nicer look. I'm also planning the dialog's close behavior: a backdrop click should close it, and focus should go back to the trigger afterward. Title validation will be custom, showing a "Title is required" message and refocusing the input instead of relying on the native browser bubble.

Still writing the theme CSS variables...

Still writing styles...

Now I'm laying out the topbar so it wraps on narrow screens, with the search field going full width below the brand row at 375px. The board itself will be a three-column grid with gaps and padding, and I'm about to write its styles.

Still writing the board layout styles...

Still writing the card styles...

Still writing card styles...

Still writing drop-zone styles...

Still writing the drag handling code...

Still writing the drag handling code, now working out how to find the column under the pointer and pick the insertion slot.

Still working through the drop placement, comparing the pointer's position against card midpoints to pick where the placeholder goes.

Still working through the drop placement, checking whether the placeholder's own insertion shifts the card midpoints enough to make the pointer flip between slots.

Still working on the drop placement, now weighing a placeholder-based check: comparing the pointer against the placeholder's own midpoint so the slot only moves when the pointer clearly passes it.

Still working out the placement logic, now considering a placeholder-relative check so the slot only changes when the pointer clearly crosses a card's midpoint.

Still working out the placement logic, checking how the placeholder's own move shifts the card midpoints so the slot stays stable rather than flipping back and forth.

I'm checking the midpoint logic: with the placeholder before card C, the shifted midpoint keeps the pointer on the same side, so the slot holds steady and doesn't flip back and forth. The ambiguous band near the boundary resolves consistently either way, and the placeholder's height roughly accounts for the gap shift.

If the drop lands outside every column, I'll just call render(), which rebuilds the board from state so the card returns to where it started. When the card is dropped back into its own slot, moving it there leaves the state effectively unchanged, so that's fine too.

I'm working through the drag interaction: I'll attach the move and release listeners to the window once a drag starts, and use pointer capture on the card so the delete button and plain clicks still behave normally. I'm also weighing whether `touch-action: none` on cards will block page scrolling on mobile.

I'm settling the touch behavior: on phones, a long press of about 180ms will start a drag, and a movement before that cancels the pending press so the page can scroll normally. I'll only apply `touch-action: none` once a drag has actually begun.

I'm settling the touch handling: once a drag has started on a phone, I'll block the page from scrolling with a non-passive touchmove listener that calls preventDefault while dragging, since touch-action alone can't affect a gesture that has already begun.

Still writing the drag handling code, now deciding how a press on a card starts a drag: a mouse starts dragging once it moves a few pixels, while a touch needs a short hold so a plain swipe still scrolls the page.

Still writing the drag handling code, now wiring up the ghost element and placeholder that follow the pointer during a drag.

Still writing the drag handling code, now setting up the ghost's offset from the pointer and adding a touchmove listener that blocks scrolling while a drag is active.

Still writing the drag handling code, now cleaning up the ghost and placeholder on drop and moving the card to whichever column and slot the pointer last reached.

Still writing the drop handling, now wiring up the cleanup so the ghost and placeholder come off on release and the card lands in the chosen slot.

Still writing the search and highlight code, now deciding how to split each title around matches so the matched text gets wrapped in a mark element.

Still writing the search and highlight code, now working out how to lowercase the query and handle the matches inside each title.

Still writing the render loop, now filtering each column's cards by the search query and updating the count badges.

Still writing the drag handling code, now deciding that empty-column placeholders should hide during a drag so only the drop slot shows.

Still writing the card builder, now setting up the card element with its title and a delete button, and placing the priority badge in the footer.

Still writing the card builder, now deciding to skip the fade-out animation on delete so the logic stays simple.

Still writing the form code, now laying out the add-card modal with its title field, error message, priority options, and status select.

Still working on the card ordering, confirming that pushing a new card onto the array puts it at the bottom of its column, and planning a separate insert helper for moves that places the card before a given id or at the column's end.

Still writing the dialog logic, now handling the close path so focus returns to the button that opened it, and planning a backdrop click check so only clicks on the dialog itself dismiss it.

Still writing the header code, now wiring up a theme toggle button that swaps the page between light and dark by setting the color scheme on the root element.

Still writing the page layout, now adding a responsive rule so the board stacks into one column on narrow screens and the columns lose their fixed height.

Still writing the topbar and search layout CSS, now setting the search to sit on its own full-width row below the brand and actions on narrow screens.

Still writing the responsive CSS, now checking that the topbar fits at 375px: the brand, the theme and new-card buttons, and the search on its own row.

Still writing the layout CSS, now setting the grid so each column gets a minimum height for dropping cards into, and the list fills the rest of its column.

Still writing the drag handling code, now styling the column highlight and the card hover and grab cursors.

Still writing the drag handling code, now setting up the ghost's cleanup so the cloned card drops its flash and dragging classes and gets an explicit width.

Still writing the drag handling code, now noting that the original card gets hidden during a drag and the column-finding logic should skip it.

Still writing the drag state, now setting up the pending press, the active flag, and the card being moved.

Still writing the drag handling code, now setting up the pointerdown handler that ignores non-primary mouse clicks and clicks on buttons, and recording where the press started on the card.

Still writing the drag handling code, now setting up the pointermove listener that tracks the pending press and hands off to the active drag.

Still writing the drag handling code, now wiring the window-level pointermove and pointerup listeners that track the pending press, start the drag past the threshold, and end or cancel it on release.

Still working on the pointer handling, now checking whether a mouse released outside the iframe still delivers pointerup to the window.

Still writing the drag code, now weighing whether to capture the pointer on the ghost, since the original card gets hidden during the drag and capture might drop with it.

Still writing the drag handling code, now weighing whether to capture the pointer on the ghost, since it isn't hit-testable with pointer-events set to none.

Still working on the pointer handling, now deciding to skip pointer capture and rely on window-level listeners, adding a blur handler so a drag cancels if the window loses focus.

Still writing the drag start code, now cloning the card into a ghost, sizing it to the original width, and inserting a placeholder.

Still writing the drag start code, now setting the placeholder's height to match the card, inserting it before the card, and marking the card and body as dragging so the cursor changes and empty columns hide.

Still writing the drag code, now working out where the drop target lies by checking which column is under the pointer and finding the card position within it.

Still writing the drag move code, now finding the column under the pointer, placing the placeholder before the first card whose midpoint is below the pointer, and recording that column's status and insert position as the drop target.

Still writing the drag move logic, now sorting out how the ghost is excluded from hit-testing and how the over-column highlight gets cleared and reset as the pointer moves.

Still writing the drag end code, now removing the ghost, placeholder, and dragging classes, then clearing the drop highlight and resetting the drag state.

Still writing the card move logic, now finding the card's index and removing it from the list, then setting its new status.

Still writing the card move logic, now deciding that if no card in the target column sits at the drop point, the card goes at the end of the list, with the search still active and the target card staying visible.

Still writing the drag handling code, now making sure a touch drag doesn't scroll the page by blocking the default on touchmove while a drag is active.

Still writing the drag code, now adding a touchmove listener that blocks scrolling while a drag is active, and a contextmenu guard so a long press doesn't open the menu mid-drag.

Still writing the board's column config, now laying out each column's key and label, and setting the dropdown of priorities so the cards can be filtered when the search runs.

Still writing the board's column config and seed data, now setting the three column keys and labels, and laying out six starter cards with ids, priorities, and statuses.

Still writing the seed data, now settling on six starter cards with two in each column, and I'm leaning toward medium priority for the "Write onboarding email sequence" card.

Still writing the drag handling code, now laying out the column and card markup for the board so the drag targets and the add-card modal have something to attach to.

Still writing the CSS variables, now setting the palette for the board's surfaces, borders, accent color, shadows, and the low, medium, and high priority badge colors.

Still writing the CSS palette, now filling in the dark theme's surfaces, text, accent, and the low, medium, and high priority badge colors.

Still writing the stylesheet, now setting up the base body rules, form controls, and a hidden-text helper.

Still writing the topbar styles, now laying out the sticky header's flex row, the brand block, and the logo tile.

Still writing the stylesheet, now on the search box, with the input's focus ring and a keyboard hint sitting inside it.

Still writing the stylesheet, now on the button styles, with a hover state and a press effect.

Still writing the button styles, now adding the primary variant, an icon-only size, and a focus ring, and planning to show either the sun or moon theme icon depending on the current theme.

Still writing the board layout CSS, now sizing the columns in a three-part grid and capping their height to the viewport.

Still writing the layout CSS, now checking whether a narrow topbar that wraps would push the column height calculation off.

Still writing the board layout CSS, now deciding that the columns should all be the same height, with a fixed height calculated from the viewport and a minimum height so short columns don't collapse.

Still writing the column styles, now sizing the columns to fill the space under the topbar with a minimum height so they don't collapse.

Still writing the column header and list styles, now sizing the dots, count badges, and add button, and setting the card list to scroll inside its column.

Still writing the CSS, now adding a scrollbar style and a highlight for columns that are a drop target, then starting the card rules.

Still writing the card styles, now on the title text, the id label, and the footer row.

Still writing the card styles, now on the delete button, which stays hidden until the card is hovered or focused and shows on touch screens.

Still writing the card styles, now on the delete button's hover and focus states, and on the flash animation that highlights a newly added card.

Still writing the placeholder styles, now setting its dashed border so the drop position shows while a card is dragged.

Still writing the stylesheet, now on the drag placeholder, the dashed outline that marks where a card will drop, and the empty-column state.

Still writing the drag ghost styles, now making it a fixed-position element with a lifted shadow and a grabbing cursor, hiding its delete button, and hiding empty-column messages while a drag is active.

Still writing the dialog and modal styles, now setting the backdrop blur, the card's rounded corners and shadow, and the form's padding.

Still writing the dialog styles, now on the form inputs, their focus and invalid states, the error line, and the chip-style radio options for priority.

Still writing the chip styles, now on the checked state, where the selected priority gets its tinted background and an accent ring.

Still writing the toast styles, now positioning the notification at the bottom center of the screen.

Still writing the toast and responsive CSS, now on the toast's hidden-then-shown transition and its maximum width on narrow screens, then starting a media query that switches the board to a single column.

Still writing the responsive CSS, now making the board a single column on narrow screens and letting the columns grow to fit their content.

Still writing the stylesheet, now setting a minimum height on the card lists so empty columns can still take a drop, and checking how the columns behave when the board stacks on narrow screens.

Still writing the drag handling, now adding auto-scroll so a card can reach a column that's off-screen on narrow layouts.

Still writing the drag handling, now adding a loop that scrolls the window when the pointer nears the top or bottom edge, and I'm wondering whether the long desktop columns need the same auto-scroll for their own lists.

Still writing the auto-scroll, now checking whether the list under the pointer can scroll and scrolling it when the pointer gets close to its top or bottom edge.

Still writing the auto-scroll, now handling a scrollable list under the pointer by scrolling it when the pointer nears its top or bottom edge, and falling back to scrolling the window otherwise.

Still writing the auto-scroll, now wiring the drag position into the placeholder logic, and planning to add the inline search icon's SVG markup next.

Still writing the icon markup, now on the SVG paths for the search, plus, trash, sun, and moon icons.

Still writing the Kanban script, now setting up the column definitions and the data for the starter cards.

Still writing the Kanban script, now defining the columns, the priority labels, and the starter cards in state.

Still writing the Kanban script, now filling in the starter card data and the state object.

Now I'm setting up the HTML structure for each column: a header with a colored dot, the title, a count badge, and an add button, with a list container below for the cards.

Still writing the Kanban script, now wiring up board clicks so the add buttons open the form and the delete buttons remove a card.

Still writing the modal logic, now setting up the open-dialog function so it resets the form, pre-selects the column's status, and focuses the title input.

Still writing the modal's submit handler, now checking the title and adding the new card to the state.

Still writing the submit handler, now checking that the title is set, then adding the new card to the state with its own id.

Still writing the search handler, now syncing the query into state and filtering the cards as the user types.

Still writing the search handling, now wiring the input to update the query and re-filter the cards, and adding an Escape key shortcut that clears the search.

Still writing the render function, now filtering the cards for each column by the search query and building each card or an empty-state message.

Still writing the render function, now wiring up the empty-state messages and updating each column's count and the board's summary line.

Still writing the Kanban script, now on the delete button for each card, with its accessible label and a click handler that removes the card from state.

Still writing the card builder, now creating the delete button with its label, then the priority badge and card ID row.

Still writing the drag handling, now setting up the pointer-down handler that ignores non-primary pointers and starts a pending drag only when no other drag is in progress.

Still writing the pointer-down handler, now setting up a touch timer that starts the drag only after a short press.

Still writing the drag handling, now deciding that a touch press only starts a drag once the pointer has moved a few pixels, and beginning the move check for the pending drag.

Still writing the pointer handlers, now handling pointer-up so a drag that is in progress ends when the pointer is released.

Still writing the drag handling, now clearing the pending drag on pointer release and on pointer cancel, and handling a cancel during an active drag by returning the card.

Still writing the drag handling, now setting up startDrag to take over the pending press: it builds a ghost copy of the card that follows the pointer, leaves a placeholder where the card was, and starts an auto-scroll loop.

Still writing the drag handling, now making sure the placeholder goes in before the card is hidden, and positioning the ghost so it stays under the pointer by the offset from where the card was grabbed.

Still writing the drag handling, now working out where the placeholder goes by checking each card's position against the pointer inside the column under it.

Still writing the drag placement, now checking the placeholder's position against each card's midpoint and moving it into the right spot in the target column.

Still writing the drag handling, now working out how the placeholder moves, with the auto-scroll loop starting to check which list is under the pointer.

Still writing the auto-scroll, now checking whether the list under the pointer can scroll up or down and nudging it when the pointer is near its edge.

Still writing the auto-scroll, now checking the window's edges as a fallback, and clamping the scroll step so it stays within a small range.

Still writing the auto-scroll, now checking that the list's scroll position stays in bounds after each nudge, and noting that the window fallback takes over in the stacked mobile layout.

I'm checking whether setting overflow-x hidden on the body changes how the page scrolls. It should propagate to the viewport, so window scrolling still works, though I'm not fully settled on that.

Still writing the Kanban script, now finishing the end-drag logic that commits the move, sets a flash highlight on the card, and posts a notice about the new column.

Still writing the drag handling, now finishing the drop logic so a successful drop moves the card and flashes it.

Still writing the Kanban script, now wiring up the Escape key so it cancels an active drag, along with shortcuts for focusing search and opening the add-card form.

Still writing the keyboard shortcuts, now handling the `n` key to open the add-card form and ignoring keys while the user is typing, then planning a window blur handler that cancels any active drag.

Still writing the touch and context-menu guards, now stopping page scroll during an active drag and suppressing the menu while a drag is pending or running, then starting the theme setup.

Still writing the theme code, now setting up applyTheme to switch the document's theme and update the toggle button's label and tooltip, plus a click handler that flips between light and dark.

Still writing the toast, now adding a notice helper that sets the message, shows it, and hides it after a couple of seconds, and planning an Undo button for delete so the toast can carry an action.

Still writing the undo flow, now deciding that a delete keeps the removed card and its index so the toast can offer an Undo button that puts it back.

Still writing the delete undo, now wiring the toast's Undo button so it shows only when an action is passed and hides the toast when clicked.

Still writing the toast, now working out how the Undo button shows and hides, and how the toast stays clickable while it is visible.

Still writing the dialog markup, now laying out the form fields: a required title input, a priority chip group, and a column select.

Still writing the dialog markup, now adding the close and submit buttons to the form footer.

Still writing the dialog styles, now checking that clicks on the backdrop land on the dialog itself so they can close it, and setting the fieldset resets so the priority chips lay out cleanly.

Still writing the chip styles, now giving each priority chip its own colors and hiding the native radio inputs, then styling the chip labels so the checked one fills with its color.

Still writing the chip styles, now working out the field spacing and the select's padding so the dropdown lines up with the inputs.

Still writing the dialog styles, now working out the legend-free priority group and the field spacing so the chips sit in a clean row above the column select.

Still writing the dialog styles, now checking the dialog's default max-width and centering so the modal sits correctly on both wide and narrow screens.

Still writing the dialog styles, now laying out the accessibility details and the header button, then setting the column dot colors per status.

Still writing the dark theme colours and the column and card backgrounds, now checking how the board surface contrasts with the cards.

Still writing the drag handling, now checking how the placeholder sits relative to the card being dragged so the list layout doesn't jump.

Still writing the Kanban styles, now checking the drag placeholder's layout and the flash animation on dropped cards, and making sure the script won't hit any null references.

Still writing the Kanban markup, now laying out the header and the start of the body.

Still writing the Kanban markup, now laying out the search box and the action buttons in the header.

Still writing the Kanban markup, now filling in the search field and the header buttons with the theme toggle and the new-card action.

Still writing the Kanban markup, now laying out the column headers with their dots and counts.

Still writing the Kanban markup, now laying out the column sections with their headers, counts, and add buttons.

Still writing the Kanban script, now setting up the column lookups so each status maps to its list and count elements.

Still writing the Kanban styles, now sorting out the column header padding and heading size, and checking that the list scrolls without needing overflow on the column itself.

Still writing the Kanban markup, now laying out the column sections with their headers, counts, and add buttons, then mapping the card rendering styles for the lists.

Still writing the CSS variables, now setting the border, accent, shadow, and input colors that the rest of the styles build on.

Still writing the dark theme variables, now setting the background, surface, and text colors along with the accent and its soft and ring tints.

Still writing the dark theme variables, now setting the glow, shadow, and input colors plus the priority chip tints for the dark palette.

Still writing the body styles, now setting the page background, text color, and a system font stack with a short transition for theme changes.

Still writing the layout, now sizing the board columns to fit the viewport height so the page doesn't scroll on desktop.

Still writing the stylesheet, now checking the topbar and columns at the 900px breakpoint so the three columns stay readable.

Still writing the Kanban script, now defining the column list and the priority labels, plus the trash icon for the delete buttons.

Still writing the Kanban script, now setting up the state, the column lookups, and the search and theme controls.

Now I'm wiring up the remaining DOM references for the form, the toast, and the Undo button, plus a small helper that shortens long card titles.

Still writing the search handling, now wiring the clear button and the Escape key so they reset the query and re-render the board.

Still writing the dialog opener, now resetting the form, setting the default status, and focusing the title field.

Still writing the Kanban script, now wiring the dialog's close buttons and the backdrop click so the modal can be dismissed, and restoring focus to whatever opened it when it closes.

Still writing the notification helper, now wiring the undo action and the auto-hide timer for the toast.

Still writing the click handler, now checking whether the click landed on an add button so the matching column dialog opens.

Still wiring the board clicks, now routing add buttons to the matching dialog and delete buttons to the card removal.

Still writing the theme handling, now wiring the toggle button and setting the default light theme with its label.

Still writing the Kanban script, now adding the global keyboard handler that ends a drag on Escape and skips shortcuts while the user is typing or the dialog is open, then wiring up the "/" key to focus search.

Still writing the Kanban script, now wiring the keyboard shortcuts: Escape ends an active drag, and "/" focuses search while "n" opens the new-card dialog, both skipped while typing or with the dialog open.

Still writing the list styles, now setting the minimum height so empty columns keep a usable drop area.

Still writing the Kanban styles, now checking that the list shrinks to fit the column height while still scrolling when the cards overflow.

Still writing the Kanban styles, now setting the list to a minimum height of 80px so it keeps a drop area and scrolls when cards overflow, and centering the empty-column message.

Still writing the Kanban styles, now setting up the topbar with its sticky positioning, flex layout, and the logo block.

Still writing the Kanban styles, now setting the search input's padding, border, and background so the field lines up with its icon.

Still writing the search styles, now adding the clear button and the actions container for the topbar.

Still writing the stylesheet, now defining the button base, hover and press states, and the icon button size.

Still writing the board layout, now setting up the three-column grid and the sizing of each column.

Still writing the board styles, now setting the column height to fill the viewport with a minimum, the background and border tokens, and a rounded frame, then tinting each column's dot by its status.

Still writing the column styles, now adding the header dot, the count badge, and the add button.

Still writing the media query for the narrow breakpoint, now setting the list's drop area and scroll behavior for the card columns.

Still writing the responsive breakpoints, now stacking the board into one column at 900px and dropping the column heights to auto.

Still writing the media queries, now working out the breakpoint for hiding the stats line under the brand name so the top row fits on small screens.

Still writing the dialog styles, now setting the card's rounded frame and shadow and the backdrop blur and fade-in animation for the modal.

Still writing the dialog form styles, now setting the field label, the required marker, and the input's size and border.

Still writing the dialog form styles, now setting the input's placeholder color, its focus and invalid border states, and the select's arrow padding.

Still writing the chip styles, now setting up the priority chips with their colored backgrounds and hiding the real radio inputs.

Still writing the dialog form styles, now setting the chip's checked state with its colored background and focus ring, and the focus-visible outline for keyboard users.

Still writing the badge styles, now setting the pill shape and the small colored dot before the label.

Still writing the toast styles, now setting its fixed position, the dark pill look, and the initial hidden state.

Still writing the toast styles, now setting the undo button's color so it stays readable against the light toast background in dark mode.

Still writing the toast and drag styles, now fixing the toast to a dark background with light text and a lighter undo color so it reads the same in both themes, then starting the placeholder and drag-ghost rules.

Still writing the drag ghost styles, now making sure the floating copy doesn't lag behind the pointer by turning off its transition.

Still writing the card styles, now giving the card a relative position, a fixed flex size, and its rounded frame with shadow, and limiting its transition to the shadow and border color so the hover effect stays smooth.

Still writing the card styles, now setting the title's margin, font, and line height, and the accent-colored highlight for matched text.

Still writing the card styles, now setting up the delete button's corner position and making it appear on hover and focus, then giving it a red-tinted hover state.

Still writing the card styles, now handling the hover and focus reveal of the delete button and the brief highlight animation on newly added cards.

Still writing the Kanban styles, now finishing the drag and empty-state rules: the empty column message gets a dashed border and centered muted text, and the delete button stays visible on touch devices where hover isn't available.

Still writing the Kanban script, now setting up the board's DOM references and the search controls.

Still writing the Kanban script, now setting up the drag-and-drop and render helpers, with the search highlighting and the toast undo behavior.

Still writing the Kanban script, now handling the search highlight: I'm lowercasing the card text, walking through each match of the query, and wrapping each one in a mark element while keeping the text around it as plain nodes.

Now I'm setting the highlight to skip marking when lowercasing changes the string length, falling back to plain text in that case. I'm also checking that the search query is compared against titles the same way in the filter.

Next up is the drag-and-drop code, starting with the shared drag state and the pointerdown handler.

Still writing the drag handler, now checking for mouse buttons and interactive targets, then capturing the card's position so the drag can start from the pointer's offset.

Still writing the drag handler, now wiring up the pointermove tracking so a mouse drag starts once the pointer moves a few pixels and a touch drag only starts if the finger stays put.

Still writing the drag handler, now wiring up the end-of-drag handling so a drop commits on pointerup and a cancel backs out.

Still writing the drag start, now clearing the pending state and cloning the card into a floating ghost, and setting up the placeholder slot.

Still writing the drag start, now placing the placeholder slot where the card was, marking the card and body as dragging, and recording the pointer id, card id, and grab offsets so the drop can be tracked.

Still writing the drag handler, now working out where the ghost is positioned each frame from the pointer and grab offsets, and how the placeholder gets moved to follow the pointer over the columns.

Still writing the autoScroll helper, now measuring the board's edges so the drag can scroll it when the pointer nears them.

Still writing the autoScroll helper, now handling the case where the pointer nears the edge of the window and scrolling the page instead.

Still writing the autoScroll helper, now handling the edge cases of scrolling the page near the window top and bottom.

Still writing the drag end handler, now checking which pointer ended the drag and whether the drop should commit.

Still writing the drag end handler, now clearing the drag state and ghost, and moving the card to its target column if the drop was committed.

Still writing the drag end and move logic, now working out how moveCard finds the card and removes it from the list before reinserting it.

Still writing the moveCard helper, now working out where the card lands when the drop target has a card before it or none, so it goes after the last card in that column.

Still writing the drag handlers, now wiring up the global blur handler so an in-progress drag cancels and pending state clears when focus leaves the window.

Still writing the drag code, now checking the form's priority selection and the submit handling so new cards get added correctly.

Still writing the Kanban script, now handling the dialog's form reset and the title error state, so the field clears and the error message goes away when the user types.

Still writing the Kanban markup, now finishing the new-card button and the search icon's SVG.

Still writing the Kanban styles, now checking the search bar's flex sizing and the small-screen wrapping so the controls stack cleanly.

Still writing the Kanban styles, now checking that fixed-position ghost elements won't cause the page to scroll sideways, and that the dialog and toast transitions look right.

Still writing the Kanban styles, now checking that the dark theme's color-scheme override wins over the light default, so native controls like the select dropdown render dark too.

Still writing the Kanban script, now checking the highlight edge cases and that the ghost clone won't be picked up by the board's card queries.

Still checking the drag code for text selection: cards are marked as non-selectable, so a mousedown on one shouldn't start a highlight, and the body's grabbing cursor covers the rest of the drag.

Adding a body-level user-select rule for the drag so no text selection can start mid-drag, and checking that touch long-presses won't select text either.

Still writing the Kanban styles, now checking the modal's focus handling and the column height in the stacked layout so the page sizing holds together.

Still writing the Kanban styles, now adding the reduced-motion media query that turns off animations and transitions for users who prefer less motion.

Still writing the Kanban markup, now adding the To do column's header with its dot, count, and add button, followed by its empty card list.

Still writing the toast markup, now checking that the Undo button's `hidden` attribute will actually hide it, which means keeping any display rule off that class, and that the placeholder keeps its height inline with `flex: none`.

Still writing the Kanban file, now getting the HTML document structure set up so the code can be finished.

Still writing the HTML document, now laying out the top bar with the logo, title, and card count.

Still writing the search markup, now adding the search icon and input field inside the wrapper.

Still writing the actions bar, now adding the theme toggle button with its sun icon and the rays drawn with SVG paths.

Still writing the markup, now adding the theme toggle's rays and moon icon, then starting the new-card button.

Still writing the Kanban markup, now finishing the new-card button and the board's main section.

Still writing the click handling, now working out how a drop after a mouse drag avoids triggering a click on the board.

Checking whether a mouseup over another card's delete button could trigger a delete. The click fires on the nearest common ancestor of the mousedown and mouseup targets, so it lands on the list rather than inside the button, and the delete check won't match.

Still writing the drop handling, now checking that a click landing on another card's delete button can't fire, since the click goes to the common ancestor and not the button.

Still writing the Kanban script, now building the card renderer so it adds a flash effect when a card matches, and wiring up the empty-column message so it shows the search term when nothing matches.

Still writing the Kanban styles, now checking the drag tracking loop so auto-scroll keeps running correctly and cancels cleanly when the drag ends.

Wrapping up the drag handling now, making sure the cancel path works even if the drag ends before the first animation frame runs.