GLM 5.3 Flash

The user asks for HTML/CSS only weather cards. My default approach is a single self-contained HTML file with inline CSS. No JS at all. Design: I want this to look genuinely crafted, not the generic "four equal cards in a row with pastel gradients" — but the task explicitly requires a 4-per-row responsive grid with per-card gradients, so the structure is given. I can still elevate it with distinctive typography, refined icon craft built purely from divs/pseudo-elements, cohesive motion, and atmospheric detail.

Let me plan the design language:

- A dark editorial backdrop? Or light? Weather cards often look cheap with saturated gradients. I'll go for rich, deep, atmospheric gradients per card (dusk amber for sunny, deep slate-blue for rain, cold blue-grey with soft light for snow, near-black purple storm). Each card's gradient gets subtle depth — layered radial glows via ::before overlays? I must be careful: icons need pseudo-elements themselves, so structure the DOM with dedicated elements for icon parts.

Typography: avoid Inter/Roboto/system-ui as identity font. No external fonts allowed? The rules say no external files/fonts except CDN URLs explicitly allowed — task says no images/SVG/icon fonts, doesn't forbid Google Fonts, but my deliverable constraints say "No external files, images, fonts or network requests, except the CDN URLs explicitly allowed by the task." Task didn't allow CDN fonts, so I should use system font stacks but pick something distinctive: e.g. "Georgia / 'Iowan Old Style'" serif for city names + a mono for temperature? Actually a nice combo: serif display for city, tabular numeric via "ui-monospace" fallback stack for temperature gives editorial character. Use font stacks like `"Palatino Linotype", Palatino, Georgia, serif` and `"SF Mono", "Cascadia Mono", Menlo, Consolas, monospace`. That's characterful without external requests.

Layout: header with a title ("Atmospheric Index" or something), then the grid. Cards: 4 columns desktop (min-width ~1024), 2 columns tablet, 1 column mobile. Hover: lift (translateY + shadow + slight scale), transition.

Icons — built from divs + pseudo-elements:

1. Sun: a core circle (div) + rays. Rays: use a wrapper div with 8 span children? The requirement says built from HTML elements and pseudo-elements — spans are fine. Animate rotation of the ray ring (rays container rotates slowly). Pulsing glow on core. Rays can be small bars: each span positioned with transform rotate(i*45deg) translate. Bars with rounded ends. Maybe rays alternate lengths. Keep it crisp.

2. Rain: a cloud (two overlapping rounded shapes: main div with border-radius, plus ::before as the cloud bump — classic cloud construction: div with border-radius 50px, ::before smaller circle offset). Rain drops: several spans falling with translate/opacity keyframes, staggered delays via nth-child. Drop shape: small rotated rounded rectangle (like elongated teardrop: border-radius with one corner 0 rotated 45deg? A classic teardrop: border-radius: 0 50% 50% 50%; transform: rotate(45deg)). Animate falling downward with fade.

3. Snow: cloud + snowflakes. Snowflake built how? Simple: small circles (dots) that drift down with sway (translateX oscillation + fall). Or actual six-arm flakes via a span with ::before/::after crossed bars — that's 3 bars per flake, doable: span is a vertical bar; ::before horizontal bar; ::after rotated 45deg? Actually with one element + 2 pseudos I can make: element vertical bar, ::before horizontal bar (rotate 90deg), ::after rotated 45deg cross — giving 6 arms? vertical + horizontal + one diagonal = 6 arms at 0/90/45/135... that's only 4 directions from 2 bars, plus diagonal gives 6 arms total (0,90,45,135 = 8 arms? vertical bar = arms at 90° and 270°, i.e., a line through center covers two arms). Vertical line = 2 arms, horizontal = 2 more (4 total), one diagonal = 2 more (6 total? no—diagonal line through center covers 45° and 225°, total 6 arms... wait 0°,90°,45°,135°? A cross (vertical+horizontal) = 4 arms. Adding one diagonal (45°–225°) gives 6 arms. Good enough — a six-armed flake. Rotate the flake while falling. Sway animation with fall. Nice.

Actually simpler and still lovely: use the 6-arm flakes for maybe 3 flakes, each spinning as it falls and sways.

4. Storm: dark cloud + lightning bolt built from elements + flash animation. Bolt: classic CSS bolt — a div with clip-path polygon (clip-path is CSS, fine). Bolt flashes: opacity keyframes with sharp steps + a card-wide flash overlay (a div covering card that flickers). Also maybe rain drops too. And a subtle screen-flash using a radial overlay pulsing. Plus tiny rain streaks.

Extra craft touches:
- Temperature big, with degree symbol; description below; small meta row (feels like / humidity / wind) — wait, "rows of repeated identical cards" concern: the task mandates 4 cards of same structure, that's the ask; I differentiate through per-card colors and content. I'll add a small detail line per card to give it life (e.g., "UV 8 · Light breeze"), varied.
- A subtle animated atmosphere: sun card has drifting light rays/sheen; rain card has faint mist; snow card faint vignette.
- Time-of-day label per card ("14:00 local" etc.)? Keep restrained.
- Hover lift with layered shadow and slight icon scale.

prefers-reduced-motion: disable animations (animation: none) and hover transform maybe keep but reduce.

Header: title in serif, small subtitle. Maybe a thin rule. Background of page: deep ink (#0d1117-ish? avoid default blues) — I'll use a warm dark charcoal (#12151a) or a paper light? Dark suits glowing weather icons. But "no large low-contrast gray areas on dark backgrounds" — I'll ensure text contrast strong. Page bg: very dark neutral #101214 with cards providing the color.

Card design details:
- aspect ratio roughly portrait, ~ 260–300px wide, padding generous.
- top: city name (serif, letter-spaced small caps? maybe uppercase tracked label for country + serif city).
- center: icon stage (a fixed-height area).
- bottom: temperature (large mono), description, divider line, micro stats row.
- Border: 1px subtle translucent white; radius ~20px; inner top highlight via inset shadow.

Gradient definitions:
- Sunny: linear-gradient(165deg, #f7b733 → warm?) hmm avoid garish. Amber dusk: #2b1a0e? No — sunny should feel bright. Let me choose: radial warm gold: linear-gradient(170deg, #FFD08A? too pastel). I'll do rich: `linear-gradient(160deg, #ff9d4d 0%, #e2603a 55%, #8c2f39 100%)` sunset warm. Text white.
- Rainy: `linear-gradient(160deg, #4a5d7a 0%, #2d3c52 60%, #1d2735 100%)` slate blue-grey.
- Snowy: `linear-gradient(160deg, #9fb8cc 0%, #6b8aa6 55%, #46617c 100%)` cold.
- Stormy: `linear-gradient(160deg, #3b3550 0%, #251f33 60%, #17131f 100%)`.

Add a radial glow overlay per card behind icon (per-card ::before on card or a dedicated .glow div) — light source behind icon.

DOM structure per card:

```
<article class="card card--sun">
  <div class="card__glow"></div>
  <header class="card__loc">
    <span class="card__country">PT · ALGARVE</span>
    <h2 class="card__city">Faro</h2>
  </header>
  <div class="stage"> ... icon ... </div>
  <div class="card__data">
    <div class="card__temp">28<span>°</span></div>
    <p class="card__desc">Clear skies... </p>
    <ul class="card__meta"> ... </ul>
  </div>
  <div class="flash"></div> (storm only)
</article>
```

Icon constructions:

Sun:
```
<div class="icon icon--sun">
  <span class="sun__rays"><i></i>×8</span>  -- or 8 <i> in .rays, each rotated
  <div class="sun__core"></div>
</div>
```
rays: .sun__rays absolutely centered, animation spin 24s linear infinite. Each i: position absolute, width 4px height 14px, background currentColor?, left/top 50%, transform: rotate(a) translateY(-46px). Alternate lengths: nth-child(odd) longer. Use box-shadow glow subtle? Glowing titles avoided but a soft glow on a sun is diegetic — keep it modest, or skip glow, just solid shapes. I'll keep a soft warm radial glow div behind (the card__glow handles it).

Rays color: #ffd98a / #ffe9c2.

Sun core: 56px circle, background gradient radial (#fff4d6 → #ffb84d), animation pulse scale 4s ease-in-out infinite alternate.

Rain cloud:
```
<div class="icon icon--rain">
  <div class="cloud"><i class="drop"></i>×? drops should be siblings of cloud inside icon
  <span class="drop"></span> ×5
</div>
```
Cloud: main body width 96px height 34px border-radius 20px background #e8eef4-ish; ::before circle 44px at left top; ::after circle 36px right. Actually classic: base rounded rect + two bumps. Puffs colored slightly darker bottom? Flat off-white #dfe7ee with subtle inner shadow via box-shadow inset.

Drops: 5 spans, width 5px height 12px, border-radius with teardrop: `border-radius: 60% 60% 60% 60% / ...` simpler: rounded rect with border-radius 3px 3px 5px 5px and slight rotation? Teardrop trick: `border-radius: 0 50% 50% 50%; transform: rotate(45deg)` gives a drop pointing up-left... rotate(-45deg) points up. Height > width for elongation: width 6 height 6 with that radius makes a diamond-ish drop; elongate: width 7px height 7px? For elongation use scale. Simpler: just use small rounded pills falling straight down (streak-like) — reads as rain clearly. I'll do elongated drops: width 3px height 14px, border-radius 3px, slight rotate(12deg)? straight vertical fine, maybe rotate ~8deg for wind. Animate: translateY(0→70px) opacity 0→1→0, duration ~1.2s, staggered delays and left offsets via nth-child. Color: rgba whites / light blue #bcd6ee.

Snow cloud similar color slightly cooler; flakes: 3 spans, each flake element with 2 pseudos as arms:
```
.flake { width:2px;height:14px; background:#fff; }
.flake::before { content:""; position:absolute; inset:0; transform: rotate(60deg); background: same }
.flake::after { rotate(-60deg) }
```
Center them: span positioned, pseudos absolute centered (left 50% top 50% translate(-50%,-50%) rotate). Then whole flake animation: fall (translateY) + sway (translateX via separate keyframe on a wrapper?) Can't easily combine on same element with different timings unless one keyframe does both. Do: flake has `animation: flake-fall 7s linear infinite` for Y + opacity, and inner rotation on the span itself `animation: spin 6s linear infinite` — but the fall translate and spin rotate conflict on same transform property. Solution: wrapper span handles fall+sway, inner ::marker... Use structure: `<span class="flake"><b></b></span>` where .flake animates position (fall/sway), and `b` (plus its pseudos) forms the 6-arm star and spins. b: width2 height14 bg; b::before rotate(60), b::after rotate(-60); b animation spin 8s linear infinite. That works and stays HTML+CSS. B elements are fine (HTML elements).

Hmm, or simpler: dots. But 6-arm flakes are a nicer signature. I'll do 3–4 flakes, different sizes/delays/left positions.

Storm: dark cloud (#9aa3b5 darker: use #7f8aa0 / #6b7688? storm cloud darker slate) + bolt:
```
<div class="bolt"></div>
```
bolt: clip-path: polygon(55% 0, 20% 55%, 45% 55%, 30% 100%, 80% 40%, 52% 40%, 75% 0) — I'll craft: classic bolt polygon: `polygon(60% 0%, 25% 55%, 48% 55%, 38% 100%, 82% 42%, 55% 42%, 78% 0%)` hmm need a believable zigzag. Standard lightning bolt polygon often used: `polygon(40% 0, 70% 0, 45% 45%, 70% 45%, 25% 100%, 45% 60%, 20% 60%)`. I'll use something like that, size ~34×54px, background gradient #ffd94d → #ff9f1a, drop-shadow filter subtle. Flash animation: keyframes with mostly dim (opacity .35) and quick bright pops at certain percentages, 3s infinite: e.g. 0%,14% low; 15%,19% 1; 20% .4; 24% 1; ... staggered flicker. Plus .flash overlay div on card: radial white glow at bolt position, same timing but subtler, mix-blend? Keep simple: opacity animation synchronized (same duration/delay so they sync since both start at load).

Also storm gets 2–3 quick rain drops.

Card glow divs: .card__glow absolute inset, background radial-gradient(circle at 50% 38%, color, transparent 60%), opacity animated breathing (sunny stronger pulse; storm glow flashes with bolt timing — nice: make storm's glow share flash keyframe timing). 

Page header: 
```
<header class="masthead">
  <p class="masthead__kicker">FIELD OBSERVATORY — LIVE CONDITIONS</p>
  <h1>Four skies, one window.</h1>
  <p class="masthead__sub">Pure CSS dioramas ...</p>
</header>
```
Language: user wrote in English → all copy in English.

Maybe add a footer line small. Keep minimal.

Grid: 
```
.grid { display:grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
@media (max-width: 1080px) { repeat(2,1fr) }
@media (max-width: 560px) { 1fr }
```
Page max-width ~1180px, padding.

Card hover: transform: translateY(-10px); box-shadow bigger; transition .35s cubic-bezier; also icon stage slight scale? Maybe .card:hover .stage { transform: scale(1.06) } with transition. And the divider/underline accent on city grows? Nice micro-detail: an accent underline under city that expands on hover.

prefers-reduced-motion: 
```
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}
```
Better: set animations to none and keep static composed icon states. With animation none, drops sit at their base position (opacity 0?) — I should make base styles show a sensible static composition: drops default opacity .8 positioned mid; flakes positioned; bolt opacity 1; rays fine (rotation static). So define base positions visible and keyframes override. With `animation: none`, elements render at base styles — ensure base looks complete. For drops, base style opacity .8 and transform none (they'll appear as a row of streaks under cloud — fine). Flakes base at various translateY offsets — set per-nth base transforms so static composition looks scattered. Bolt base opacity 1. Good.

Also honor hover-lift reduction: within reduced motion media, keep hover but transition none — fine with the blanket rule.

Let me also double check: "no <script> tag or inline event handler" — pure CSS. Good, aligns with my sandbox rules (no JS needed; visible on first paint automatically).

Accessibility: role/aria minor; add `<meta viewport>`.

Now precise CSS crafting. Let me write it carefully.

Colors palette:
- page bg: #0f1216; texture: subtle radial vignette? Add a faint top gradient? "no decorative gradients" for page bg — a near-flat dark with slight radial ambience is okay but I'll keep it essentially flat dark with maybe very subtle noise? Skip noise (needs image). Flat #101318 fine, text #e8e4da warm off-white.

Accent: warm amber #e8a13c used sparingly (kicker, underlines, degree symbol). Unified.

Typography:
- Serif display: `"Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif` for h1 and city names — gives editorial feel.
- Mono for temperature + meta: `"SF Mono", "Cascadia Code", "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace`.
- Kicker: mono uppercase letterspaced tiny.

Card layout: use flex column; stage flex-grow center. Fixed min-height maybe 380px. Card padding 26px 24px.

City header: country label small mono uppercase tracked, opacity .75; city serif 28px; accent rule under: a 28px wide 2px bar in card-specific accent that widens to 56px on hover (transition). Per-card accent: sun #ffcf8a, rain #9fc3e8, snow #d6ecff, storm #ffd94d.

Temp: 46px mono weight 500, with degree superscript in accent color smaller. Description 13.5px, line-height 1.5, opacity .85. Meta row: 3 small stats separated by thin dividers, mono 10.5px uppercase tracked. e.g. sun: "UV 9 · WIND 6 KM/H · 14:52"; rain: "HUM 86% · WIND 18 · 09:17"; etc.

Wait, meta as one line text is fine (not chips/cards). Good — avoids filler chips.

Stage: height ~120px, position relative, margin block auto-ish.

Icon positions: center within stage.

Let me write sun:

```css
.icon--sun{ position:relative; width:120px; height:120px; }
.sun__core{
  position:absolute; left:50%; top:50%; width:52px; height:52px; margin:-26px;
  border-radius:50%;
  background: radial-gradient(circle at 35% 30%, #fff6dd, #ffcf7a 55%, #f39c3d);
  animation: corePulse 4s ease-in-out infinite;
}
.sun__rays{ position:absolute; inset:0; animation: spin 26s linear infinite; }
.sun__rays i{
  position:absolute; left:50%; top:50%; width:4px; height:13px;
  margin-left:-2px; border-radius:2px;
  background:#ffd98f;
  transform-origin: 50% 0;  /* hmm */
}
```
Positioning rays: place each i at center, then `transform: rotate(Xdeg) translateY(-46px)`. With transform-origin center of the element? Simpler: set i at left:calc(50% - 2px), top:calc(50% - 33px)?? Easiest: position i at center via left/top 50% and margin -2px/-6.5px, then transform: rotate(a) translateY(-44px). Since transform applies around element center, rotate then translate moves it outward along rotated axis. That works: element centered at center point, rotate(a) rotates its frame, translateY(-44px) moves outward. The bar itself also rotates to point radially — bars point outward like rays. 

8 rays at 45° increments: nth-child 1..8 rotate 0,45,...315. Alternate height: odd 15px, even 9px; also vary translateY distance (odd -46, even -44)? Keep same radius 46 so ring aligned; color alternate #ffd98f / #f7b955.

corePulse: scale 1 ↔ 1.07 + subtle brightness.

Rain icon:
```css
.icon--rain{ position:relative; width:130px; height:120px; }
.cloud{ position:absolute; left:50%; top:34px; width:96px; height:32px; margin-left:-48px; background:#eef3f8; border-radius:20px; box-shadow: 0 6px 14px rgba(8,15,25,.25); }
.cloud::before{ content:""; position:absolute; left:14px; top:-18px; width:38px; height:38px; background:inherit; border-radius:50%; }
.cloud::after{ content:""; position:absolute; right:12px; top:-12px; width:30px; height:30px; background:inherit; border-radius:50%; }
```
background:inherit works with pseudos inheriting solid color. But cloud uses background #eef3f8 — inherit copies declared value; fine.

Cloud gentle bob: animation cloudFloat 5s ease-in-out infinite alternate translateY 0→4px.

Drops: 5 spans:
```css
.drop{ position:absolute; top:74px; width:3px; height:13px; border-radius:3px; background:#bfe0ff; opacity:.85; animation: rainfall 1.3s linear infinite; }
.drop:nth-child(1){ left:28%; animation-delay:0s }
... vary left and delay and duration slightly.
@keyframes rainfall{ 0%{ transform: translateY(-6px); opacity:0 } 12%{opacity:.9} 80%{opacity:.9} 100%{ transform: translateY(34px); opacity:0 } }
```
Set slight rotate(14deg) base on drops and include in keyframe transforms: transform: translateY(...) rotate(14deg). Good.

Static fallback (reduced motion): drops at base — top:74px, visible. Fine.

Snow: cloud same shape but cooler #f2f6fa; flakes:
```css
.flake{ position:absolute; top:70px; width:0; height:0; /* wrapper for position */ }
```
Hmm wrapper needs size for children centering. Make .flake a positioned wrapper with no visual, containing <b>:
```css
.flake{ position:absolute; top:66px; width:16px; height:16px; margin-left:-8px; animation: flakeFall 6s linear infinite; }
.flake b{ position:absolute; left:50%; top:50%; width:2px; height:14px; margin:-7px 0 0 -1px; background:#eef6ff; border-radius:1px; animation: spin 9s linear infinite; }
.flake b::before, .flake b::after{ content:""; position:absolute; left:0; top:0; width:2px; height:14px; background:inherit; border-radius:1px; }
.flake b::before{ transform: rotate(60deg); }
.flake b::after{ transform: rotate(-60deg); }
@keyframes flakeFall{ 0%{ transform: translateY(-8px) translateX(0); opacity:0 } 10%{opacity:.95} 50%{ transform: translateY(20px) translateX(7px);} ... }
```
Sway within one keyframe: define at 0/25/50/75/100 with alternating translateX and continuous translateY. E.g.
```
0% { transform: translate(0,-8px); opacity:0 }
15% { opacity:1 }
50% { transform: translate(6px,18px) }
85% { opacity:1 }
100% { transform: translate(0,44px); opacity:0 }
```
translateY total ~52px within stage below cloud. Flakes 3–4 with nth-child left/delay/duration/scale variations (scale via width/height on b? use transform scale on .flake? .flake's transform is animated... put scale differences by adjusting b's height/width per nth: .flake:nth-child(2) b{ height:10px; width:1.5px... } and pseudos inherit height? pseudos have fixed height 14 — I'd need matching. Use `zoom`? Simpler: set font-size trick? Alternative: define pseudo sizes with em and set .flake font-size: .flake { font-size:10px } b{ width:.2em; height:1.4em; margin: calc(...)} and pseudos width:.2em height:1.4em. Then per-flake font-size scales everything. 

Let me do that: 
```css
.flake{ font-size:11px; }
.flake b{ width:.18em; height:1.3em; margin:-.65em 0 0 -.09em; ... }
.flake b::before,.flake b::after{ width:.18em; height:1.3em; top:0; left:0; }
```
b positioned at left:50% top:50% of wrapper; margins center it. Pseudos: position absolute at 0,0 with same dims, transform rotate — rotation around their own center: need transform-origin center; they're same size as b stacked at same origin, rotate(60deg) around center — since pseudo occupies same box as b (top:0 left:0), its center matches b's center. transform rotate about its center = about shared center. 

Per flake: `.flake:nth-child(2){ left:52%; font-size:8px; animation-delay:-2s; animation-duration:7s }` etc. Base static: with animation none, transform none → flakes sit at top:66px row — acceptable, maybe set base top varied per nth for a nicer static scatter: give each nth-child a top offset. Under animation, keyframes use translateY relative — fine.

Storm icon: cloud darker + bolt + few drops.
```css
.icon--storm .cloud{ background:#aab6c8; } /* lighter than card bg for silhouette */
```
Actually storm cloud: #8e99ad with darker under-shadow. Bolt positioned below cloud:
```css
.bolt{ position:absolute; left:50%; top:58px; width:30px; height:52px; margin-left:-15px; background: linear-gradient(#ffe08a, #ffb020); clip-path: polygon(62% 0, 18% 52%, 44% 52%, 30% 100%, 88% 38%, 56% 38%, 82% 0); animation: flicker 3.4s infinite; filter: drop-shadow(0 0 6px rgba(255,200,80,.55)); }
@keyframes flicker{
  0%,100%{ opacity:.55 }  2%{opacity:1} 5%{opacity:.5} 8%{opacity:1} 13%{opacity:.85} 16%{opacity:.5} 45%{opacity:.6} 47%{opacity:1} 52%{opacity:.55} 70%{opacity:.65}
}
```
And card flash overlay:
```css
.flash{ position:absolute; inset:0; background: radial-gradient(circle at 50% 45%, rgba(255,235,170,.5), transparent 65%); opacity:0; animation: flicker 3.4s infinite; pointer-events:none; border-radius:inherit; }
```
Same keyframe but I want flash subtler — use same keyframes with lower alpha gradient; opacity values from keyframes will scale it. Slight difference: flash opacity .55 of a .5-alpha radial → subtle. OK. Both animations same duration & start → synchronized. 

Storm drops: 2–3 thin drops animation.

Also sun card: maybe heat shimmer? Skip; glow pulse is enough. Rain card: add faint drifting mist? Could add a horizontal translucent band moving — subtle: a ::after on stage with linear-gradient translucent white moving across, opacity .06. Might be nice on rain card ("drifting mist"). Keep one: rain card mist drift. Actually keep scope controlled; polish what exists.

Card glow per type:
- sun: radial warm, animation glowPulse 5s alternate (opacity .5↔.8).
- rain: soft cool static .45.
- snow: soft cool bright .5.
- storm: synced flicker with bolt (use flicker keyframes, low alpha).

Card structure CSS:
```css
.card{ position:relative; overflow:hidden; border-radius:22px; padding:26px 24px 24px; min-height:400px; display:flex; flex-direction:column; border:1px solid rgba(255,255,255,.14); box-shadow: 0 14px 34px rgba(0,0,0,.35); transition: transform .35s cubic-bezier(.22,.61,.36,1), box-shadow .35s; }
.card:hover{ transform: translateY(-10px); box-shadow: 0 26px 50px rgba(0,0,0,.45); }
```
overflow hidden clips glow — good. But hover shadow outside card unaffected.

Card ::after top inner highlight: `content:""; position:absolute; inset:0 0 auto 0; height:1px; background: linear-gradient(90deg, transparent, rgba(255,255,255,.5), transparent)` — hmm that's a gradient but it's a hairline light catch, structural not decorative banner; acceptable? It's a subtle bevel highlight; I think fine and tasteful. Or skip. I'll keep a very subtle one — it reads as light catching the top edge, part of the diorama lighting. Keep.

Stage margin: auto 0? Layout: header (city) top; stage flex:1 centered; data bottom. 

Let me write meta rows:
- Faro, Portugal · Sunny · 28° · "Cloudless from dawn to dusk." · UV 9 · WIND 6 KM/H · SUNSET 20:14
- Bergen? Rainy city: "Chlamden"? Use real evocative cities: Sunny → Seville, Spain; Rainy → Bergen, Norway; Snowy → Tromsø, Norway? or Sapporo, Japan; Stormy → New Orleans, USA. Good variety.
- Seville 34°, Bergen 11° rain, Tromsø -6° snow, New Orleans 24° storm.

Descriptions:
- Seville: "Cloudless and blazing — shade is the only currency."
- Bergen: "Steady drizzle off the fjord, set in for the day."
- Tromsø: "Fat flakes settling on rooftops, streets hushed."
- New Orleans: "Cumulonimbus building fast; thunder on the quarter hour."

Meta lines:
- UV 9 · WIND 6 KM/H · SUNSET 20:47
- HUM 91% · WIND 18 KM/H · VIS 4 KM
- FRESH SNOW 14 CM · WIND 8 KM/H · −11° FEELS
- PRESS 998 HPA · GUSTS 74 KM/H · CELL SE

Keep 3 items each, separated by "·" via CSS or just interpuncts in markup — simplest: three <li> with CSS li + li::before{ content:"·" }. Fine.

Kicker: "DAILY CONDITIONS — FOUR SKIES, RENDERED IN PURE CSS". Title: "The Weather Dioramas". Subtitle: "No images, no scripts — every cloud, ray and flake below is plain HTML shaped by CSS."

Header layout: left-aligned, kicker mono amber, h1 serif large (clamp 34–52px), sub muted. Thin bottom rule before grid, maybe a small legend row? Keep it: header + grid + tiny footer note "Hover a card to lift it · Animations pause under prefers-reduced-motion".

Responsive: cards min-height 400 desktop; on mobile maybe 360.

Now also ensure no horizontal scrollbar: body overflow-x hidden safe.

Time to write final code. I'll be careful with transform in keyframes overriding base transforms — for drops base transform none; keyframes include rotate so consistent.

Cloud shadow: `box-shadow: inset 0 -5px 8px rgba(30,45,70,.18), 0 8px 18px rgba(10,16,28,.3)` for depth.

Sun rays keyframes spin: `@keyframes spin { to { transform: rotate(360deg) } }`.

One more consideration: `background:inherit` on pseudo — inheritance of background from .cloud: `background` shorthand inherited? background is not inherited by default; `background: inherit` explicitly inherits computed value — yes works.

Storm cloud color on dark bg must contrast: card bg darkest #17131f; cloud #99a4b8 okay.

For snow card bg is lighter (#9fb8cc top) — cloud white must contrast: use white #fff with shadow; also text on snow card: dark text? Top of card #9fb8cc with white text may lack contrast. Options: darken snowy gradient: `linear-gradient(165deg, #7d9cb8 0%, #5d7f9d 55%, #3c5877 100%)` and white text with .9 opacity — contrast okay (mid-blue with white ~ 4.5? #5d7f9d vs white ≈ 3.4). Bump darker: #6b8aa6→ use `#6f8fae, #527394, #35516f`. White on #527394 ~ 4.6 fine for large; small text at .92 opacity fine-ish. Let's set snow gradient: 160deg #7193b2 → #4d6e8e → #33506e. White text contrast vs #4d6e8e ≈ 4.8. Good.

Rain gradient: #46597a → #2e405a → #1f2c3e. White on #2e405a ≈ 9. Good.

Sun gradient: #d97a3f? Let me pick sunset amber that keeps white readable: `linear-gradient(165deg, #e08a3c 0%, #c25b32 55%, #7c2d2b 100%)`. White vs #c25b32 ≈ 4.9? Roughly fine. Top #e08a3c with white ~3.2 — top holds only the small country label; city sits below on darker area... actually gradient top is where header is. Make top darker: 170deg, #b8542f 0%, #d2763a? Hmm. Alternative: top lighter is where glow is… For contrast simply choose: `linear-gradient(170deg, #d1742f, #a94a2c 55%, #6f2b26)`. White vs #d1742f ≈ 3.6 — the kicker/city are large-ish; acceptable but I'd rather be safe: darken: `#b65a26 → #8f3c25 55% → #5d241f`. White vs #b65a26 ≈ 5. Good, still warm amber-orange.

Storm: #3d3752 → #2a2440 55% → #1b1730. White fine.

Glow behind icon: sun glow rgba(255,190,90,.55); rain rgba(150,190,235,.35); snow rgba(220,240,255,.4); storm rgba(255,220,120,.35) flicker.

Stage height ~ 130px; icon centered via flex.

Write drops left positions: within icon width 130: use percentages 20/32/44/58/70 with slight delays -0s,-.4,-.8,-.2,-.6 and durations 1.2–1.5.

Now finalize header/footer copy and write everything. Also add `:focus-visible`? No interactive elements besides hover — cards aren't links; fine.

Let me draft the full file.

Also — degree symbol: `<span class="deg">°</span>` amber.

Card data bottom: temp row (temp + maybe "FEELS LIKE" small under? meta covers). Divider: 1px rgba(255,255,255,.22) then meta.

Description min-height to align rows? Use flex and let data stick to bottom via margin-top:auto on .card__data; stage flex:1 centers icon vertically in leftover — with consistent content heights it aligns anyway. I'll set .card__data margin-top:auto and give desc fixed min-height 40px (2 lines) for cross-card alignment.

Write final HTML now. Estimate ~300 lines. Ensure no <script>.

Font stacks: 
--serif: "Palatino Linotype","Palatino","Book Antiqua","URW Palladio L",Georgia,serif;
--mono: ui-monospace,"SF Mono","Cascadia Mono",Menlo,Consolas,"Liberation Mono",monospace;

Page bg #101318; heading color #f2ede3; muted #a9a396? ensure contrast: use #b9b2a4 on #101318 ≈ 7+. ok.

Card min-height: let content define; set min-height 420px desktop, 380 mobile.

Media queries:
- default grid 4 col.
- @media (max-width:1024px): 2 cols.
- @media (max-width:540px): 1 col.

Also card hover only on devices with hover: @media (hover:hover).

Write it.

For the top hairline on card: I said subtle; implement as .card::after inset 0 top 0 height 1px background rgba(255,255,255,.28) with mask fade? Without mask just a faint line rgba(255,255,255,.25) full width height 1px — fine, subtle.

Static (reduced-motion) composition check:
- Sun: rays rotated 0 (one ray pointing up), core visible — fine. Maybe set .sun__rays base transform rotate(22deg) for a nicer static look (animation overrides when running since animation transform replaces base — animation 'spin' from 0 to 360; during animation transform is animated, ignoring base; when none, base rotate(22deg) shows. Good.)
- Drops base: visible streaks row under cloud at top:74px translateY 0 — looks like suspended rain; acceptable. Maybe give them base opacity .8 and it looks like a rain line — fine.
- Flakes base: give nth-child tops 70/84/76/90 and left 26/48/64/38 with sizes — scattered — good.
- Bolt base opacity: set base opacity .9 (flicker anim controls when active; when disabled shows .9 — visible). Flash base opacity 0 — with animation none stays 0. Good.
- Glow: sun glow base opacity .6.

Delays negative so animations are mid-cycle at load — better first-paint variety (screenshot at 3s anyway). Use negative delays for drops/flakes so all staggered immediately visible. Yes: negative delays essential so drops are visible at t=0 mid-fall.

Flake fall keyframes with sway — write:
```css
@keyframes flakeFall{
  0%{ transform: translate(0,-10px); opacity:0 }
  12%{ opacity:.95 }
  50%{ transform: translate(7px,18px) }
  88%{ opacity:.95 }
  100%{ transform: translate(-2px,46px); opacity:0 }
}
```
Different flakes could use alternate direction: add a second keyframe flakeFallB mirrored sway for even flakes. Nice touch. I'll add flakeFallB with translate(-7px,18px).

Drops keyframes:
```css
@keyframes rainfall{
  0%{ transform: translateY(-4px) rotate(13deg); opacity:0 }
  15%{ opacity:.9 }
  75%{ opacity:.9 }
  100%{ transform: translateY(38px) rotate(13deg); opacity:0 }
}
```
Drops base top:74? cloud occupies top ~16–66 (cloud top:34 height 32 → bottom 66; bumps above). Drops start top:70. Stage height 130 — drop travel 38 → ends ~121, inside. Icon height 120... set stage 132px, icon height 122.

Positions: .icon--rain { width:130px; height:122px } cloud centered top:28px. Drops top:70px.

Snow icon: width 130 height 122, cloud top:24; flakes top:64 base.

Storm: cloud top:22; bolt top:56 height 54 → 110 within 122. Drops top:66 (short ones beside bolt? maybe skip storm drops to keep bolt focus — add 2 faint drops at edges left 18% and 78%). Yes add 2.

Sun stage: icon 120.

Also storm card could slightly shake? Skip — flicker is enough.

Hover effect extra: `.card:hover .icon { transform: translateY(-2px) scale(1.04) }` transition on .icon .35s. But icons' children animate transforms — .icon itself has no animation, safe.

Now write the code fully and carefully.

Footer note: `<footer>` small mono muted: "Pure HTML & CSS — no scripts, no images. Motion respects prefers-reduced-motion."

Header kicker: "FIELD NOTES · CURRENT CONDITIONS" color amber #e2a34f.

Let me write:

```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Weather Dioramas — Pure CSS</title>
<style> ... </style>
</head>
<body>
<main class="page">
 <header class="masthead">
  <p class="masthead__kicker">Field notes · current conditions</p>
  <h1 class="masthead__title">Four skies, one window</h1>
  <p class="masthead__sub">Every ray, drop, flake and bolt below is plain HTML shaped by CSS — no images, no scripts. Hover a card to lift it off the page.</p>
 </header>
 <section class="grid">
   4 articles...
 </section>
 <footer class="colophon">...</footer>
</main>
</body>
</html>
```

Card markup (sun):
```html
<article class="card card--sun">
  <span class="glow" aria-hidden="true"></span>
  <header class="loc">
    <span class="loc__region">Spain · Andalusia</span>
    <h2 class="loc__city">Seville</h2>
    <span class="loc__rule"></span>
  </header>
  <div class="stage">
    <div class="icon icon--sun" aria-hidden="true">
      <span class="sun__rays"><i></i><i></i><i></i><i></i><i></i><i></i><i></i><i></i></span>
      <span class="sun__core"></span>
    </div>
  </div>
  <div class="data">
    <p class="data__temp">34<span class="deg">°</span></p>
    <p class="data__desc">Cloudless and blazing — shade is the only currency outdoors.</p>
    <ul class="data__meta">
      <li>UV 9</li><li>Wind 6 km/h</li><li>Sunset 20:47</li>
    </ul>
  </div>
</article>
```

Rain: cloud + 5 drops. Snow: cloud + 4 flakes (each `<span class="flake"><b></b></span>`). Storm: cloud + bolt + 2 drops + flash overlay.

Card modifiers set: --bg gradient, --accent for rule & deg color, glow color/anim.

CSS variables per card:
```css
.card--sun{ --accent:#ffcf8a; background:linear-gradient(170deg,#b65a26,#8f3c25 55%,#5d241f); }
.card--rain{ --accent:#9fc9ee; background:linear-gradient(170deg,#46597a,#2e405a 55%,#1f2c3e); }
.card--snow{ --accent:#cfe4f6; background:linear-gradient(170deg,#7193b2,#4d6e8e 55%,#33506e); }
.card--storm{ --accent:#ffd94d; background:linear-gradient(170deg,#3d3752,#2a2440 55%,#1b1730); }
```
Glow:
```css
.glow{ position:absolute; left:50%; top:38%; width:230px; height:230px; transform:translate(-50%,-50%); border-radius:50%; background:radial-gradient(circle, var(--glow), transparent 65%); opacity:.6; pointer-events:none; }
.card--sun .glow{ --glow:rgba(255,186,92,.5); animation:glowPulse 5s ease-in-out infinite alternate; }
...
```
Set --glow var per card.

Storm glow: `--glow:rgba(255,224,130,.4); animation:flicker 3.4s linear infinite;` — flicker keyframes set opacity values up to 1 → glow alpha .4 max — good sync with bolt.

But .glow has transform translate(-50%,-50%) — flicker only animates opacity, fine. glowPulse animates opacity only, keep base transform. Good.

Keyframes list: spin, corePulse, cloudFloat, rainfall, flakeFall, flakeFallB, flakeSpin(spin reuse), flicker, glowPulse.

Cloud float: on .cloud translateY 0→5px alternate 6s. But drops are separate from cloud so drops won't follow bob — fine, subtle.

Storm bolt flicker base + drop-shadow filter constant.

Also sun rays alternate: `.sun__rays i:nth-child(odd){ height:15px; background:#ffdf9e } .sun__rays i:nth-child(even){ height:9px; background:#f2a94e }` and rotations.

Ray transforms:
i:nth-child(1) rotate(0) ... 8 ×45.

`transform: rotate(0deg) translateY(-46px)` etc.

Core margin -26px with width52. Rays inset:0 with i positioned at left:50% top:50% then transform. i base position: `left:50%; top:50%; width:4px; height:15px; margin:-7.5px 0 0 -2px;` then rotate+translate. With margin centering at the center point then translateY(-46). Ray far edge at -46-7.5=-53.5 from center; icon halfwidth 60 — fits.

Now grid gap 20px; page max-width 1160px; padding 48px 28px.

Hover lift: also raise shadow with accent tint? keep neutral black.

Meta list styling:
```css
.data__meta{ display:flex; flex-wrap:wrap; gap:4px 10px; list-style:none; margin:14px 0 0; padding-top:12px; border-top:1px solid rgba(255,255,255,.22); font:500 10px/1.4 var(--mono); letter-spacing:.12em; text-transform:uppercase; opacity:.85; }
.data__meta li+li::before{ content:"·"; margin-right:10px; color:var(--accent); }
```

Temp: 
```css
.data__temp{ font:500 52px/1 var(--mono); letter-spacing:-.02em; }
.deg{ color:var(--accent); font-size:.62em; vertical-align:.42em; margin-left:2px; }
```

Desc: font 13.5px serif? Use serif for desc — nice touch: `font: 400 14px/1.55 var(--serif); opacity:.9; margin-top:10px; min-height:44px;` maybe italic? Non-italic.

City: `font: 600 30px/1.1 var(--serif); letter-spacing:.01em;`
Region: mono 10px uppercase tracked, opacity .8.
Rule: `display:block; width:30px; height:2px; background:var(--accent); margin-top:10px; transition:width .35s;` .card:hover .loc__rule{ width:58px }.

loc__city margin 6px 0 0.

Also give city a slight text-shadow for legibility over glow? skip.

prefers-reduced-motion:
```css
@media (prefers-reduced-motion: reduce){
  .sun__rays,.sun__core,.cloud,.drop,.flake,.flake b,.bolt,.glow,.flash{ animation:none; }
  .card,.icon,.loc__rule{ transition:none; }
}
```
Keep hover translate? Fine without transition it jumps — acceptable; or keep transitions. I'll keep card transition but that's motion too — reduced-motion users: transform on hover is fine-ish, but to be respectful disable card transform hover too? The spec says respect reduced motion; blanket approach: reduce animations; keep hover lift (it's user-initiated). I'll disable the ambient infinite animations and keep hover transition. Also add comment.

Flash element for storm only, inside card after data: `<span class="flash" aria-hidden="true"></span>` positioned absolute inset 0 border-radius inherit z-index above bg but below content? Content should stay readable — flash is translucent light wash; place as first child (behind content naturally since later siblings paint above). Put it right after .glow. z-index default order fine.

Overflow hidden on card clips glow (230px circle centered at top 38% of a ~420px card: extends beyond? width 230 < card width; vertically 38% ±115 — fits in 420. ok).

Edge case: .flake b spin — reuse @keyframes spin.

Check clip-path bolt polygon validity: polygon(62% 0%, 18% 52%, 44% 52%, 30% 100%, 88% 38%, 56% 38%, 82% 0%). Trace: start (62,0) top; down-left to (18,52) mid-left; right to (44,52); down-left to (30,100) bottom tip; then jump up-right to (88,38); left to (56,38); up-right to (82,0) top right; close to (62,0). That yields a plausible bolt: wide top-right, tapering. Good enough; visual check mentally: top edge from x62→x82 (width 20% at top). From (62,0) diagonal down-left to (18,52): left slant. Across to (44,52). Down to (30,100): tip. Then up-right to (88,38): right slant. Left to (56,38). Up to (82,0). Yes classic bolt. 

Storm cloud: same cloud but color #97a1b4 and drops color #a9c4e0.

Rain cloud color #eef3f8, snow cloud #f7fafc.

Now finalize copy for meta:
- Seville: UV index 9 / wind 6 km/h / sunset 20:47
- Bergen: humidity 91% / wind 18 km/h / visibility 4 km
- Tromsø: fresh snow 14 cm / wind 9 km/h / feels −11°
- New Orleans: pressure 998 hPa / gusts 74 km/h / next cell 15 min

Temps: 34°, 11°, −6°, 24°.

Titles h1: "Four skies, one window" — good.

Body background flat #101318 with maybe subtle radial ambient at top: I'd keep flat + a faint vignette via radial-gradient darkening edges — that's atmosphere not decoration; modest: `background:#101318;` plus body::before subtle radial rgba(255,255,255,.03) top? Skip; keep clean flat.

Kicker color amber #d99a4e.

Write final file. Also html lang en. Ensure no horizontal scrollbar: body margin 0; max-width handles.

One more: degree in Tromsø "−6" with minus sign.

Let me now write out the whole thing.

Additional micro-polish: card content z-index above glow — glow is first child, subsequent siblings paint above it. Flash above glow but below loc/stage/data (it's second child). Good.

For rain card mist — skipping.

Card padding: 26px 26px 24px. Stage: `flex:1; display:flex; align-items:center; justify-content:center; min-height:140px;`

Let me assemble.