/* Layout: a light contact-sheet page that steps into a dark Darkroom band halfway down,
   then back out into daylight. Brand colours come from App/Phosgraphy/Theme.swift. */
:root {
  --paper: #FBFAF7;
  --paper-2: #F3F0EA;
  --ink: #17161A;
  --ink-2: #5D5A63;
  --line: rgba(23, 22, 26, 0.1);
  --card: #FFFFFF;
  --amber: #FFB547;
  --coral: #FF6B4A;
  --magenta: #E8478B;
  --safelight: #FF8A3D;
  --ai: #6E5BD6;
  --ai-soft: rgba(110, 91, 214, 0.1);
  --ok: #2F8F5B;
  --sun: linear-gradient(115deg, var(--amber), var(--coral) 50%, var(--magenta));

  /* The Darkroom is dark in every appearance. */
  --dr-canvas: #0A0A0B;
  --dr-panel: #111113;
  --dr-raised: #1A1A1D;
  --dr-line: rgba(255, 255, 255, 0.08);
  --dr-text: #EDEDED;
  --dr-text-2: #8C8C92;

  --display: "Instrument Serif", "Iowan Old Style", Georgia, serif;
  --body: "Hanken Grotesk", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --radius: 14px;
  --shadow: 0 1px 2px rgba(23, 22, 26, 0.06), 0 24px 60px -24px rgba(60, 30, 20, 0.28);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0E0D10; --paper-2: #16151A; --ink: #F2EFEA; --ink-2: #A6A2AC;
    --line: rgba(255, 255, 255, 0.1); --card: #1B1A1F; --ai: #9C8CF2; --ai-soft: rgba(156, 140, 242, 0.14);
    --ok: #5CC48A; --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 24px 60px -24px rgba(0, 0, 0, 0.7);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #0E0D10; --paper-2: #16151A; --ink: #F2EFEA; --ink-2: #A6A2AC;
  --line: rgba(255, 255, 255, 0.1); --card: #1B1A1F; --ai: #9C8CF2; --ai-soft: rgba(156, 140, 242, 0.14);
  --ok: #5CC48A; --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 24px 60px -24px rgba(0, 0, 0, 0.7);
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 17px/1.6 var(--body);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
h1, h2, h3 { font-family: var(--display); font-weight: 400; line-height: 1.02; margin: 0; text-wrap: balance; letter-spacing: -0.01em; }
h1 em, h2 em { font-style: italic; }
p { margin: 0; }
kbd {
  font: 500 0.8em var(--mono); padding: 0.1em 0.45em; border-radius: 5px;
  border: 1px solid currentColor; opacity: 0.85;
}
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.wrap {
  max-width: 1180px; margin: 0 auto;
  padding-left: max(20px, env(safe-area-inset-left, 0px));
  padding-right: max(20px, env(safe-area-inset-right, 0px));
}
.eyebrow { font: 600 12px/1 var(--body); letter-spacing: 0.14em; text-transform: uppercase; color: var(--coral); }
:focus-visible { outline: 2px solid var(--coral); outline-offset: 3px; border-radius: 6px; }

/* Buttons and forms */
.btn {
  appearance: none; border: 0; cursor: pointer; text-decoration: none; white-space: nowrap;
  font: 600 15px/1 var(--body); color: #fff; padding: 15px 22px; border-radius: 999px;
  background: var(--sun); box-shadow: 0 8px 24px -10px rgba(232, 71, 139, 0.6);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 12px 28px -10px rgba(232, 71, 139, 0.7); }
.btn-small { padding: 10px 16px; font-size: 14px; }
.waitlist { display: flex; flex-wrap: wrap; gap: 10px; max-width: 480px; }
.waitlist input[type="email"] {
  flex: 1 1 220px; min-width: 0; font: 400 16px var(--body); color: var(--ink);
  padding: 14px 18px; border-radius: 999px; border: 1px solid var(--line); background: var(--card);
}
.waitlist input[type="email"]::placeholder { color: var(--ink-2); opacity: 0.7; }
.waitlist .hp { position: absolute; left: -9999px; width: 1px; height: 1px; }
.form-status { flex-basis: 100%; min-height: 1.4em; font-size: 14px; color: var(--ink-2); padding-left: 18px; }
.form-status.ok { color: var(--ok); }
.form-status.err { color: var(--magenta); }

/* Nav */
.nav {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 20;
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter: saturate(1.4) blur(14px); -webkit-backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid var(--line);
}
body::before { content: ""; position: fixed; inset: 0 0 auto; height: env(safe-area-inset-top, 0px); z-index: 30; background: var(--paper); }
.nav-inner { display: flex; align-items: center; gap: 28px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font: 600 18px var(--body); letter-spacing: -0.01em; }
.brand.small { font-size: 15px; gap: 8px; }
.nav-links { display: flex; gap: 24px; margin-left: auto; font-size: 15px; }
.nav-links a { text-decoration: none; color: var(--ink-2); }
.nav-links a:hover { color: var(--ink); }

/* Hero */
.hero { position: relative; overflow: hidden; padding-block: 72px 96px; }
.trail { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.hero-grid { position: relative; display: grid; grid-template-columns: 1.25fr 1fr; gap: 40px; align-items: center; }
.hero-copy { display: grid; gap: 24px; min-width: 0; }
.hero h1 { font-size: clamp(54px, 8.4vw, 112px); }
.hero h1 em {
  display: block; background: var(--sun); -webkit-background-clip: text; background-clip: text; color: transparent;
  padding-bottom: 0.06em;
}
.lede { font-size: 19px; color: var(--ink-2); max-width: 34em; }
.etym { font: 400 13px var(--mono); color: var(--ink-2); letter-spacing: 0.02em; }
.etym i { font-style: normal; color: var(--ink); }
.hero-mark { justify-self: center; position: relative; }
.hero-mark img { width: min(320px, 70vw); height: auto; filter: drop-shadow(0 30px 50px rgba(255, 107, 74, 0.35)); }

/* Mock windows */
.window { margin: 72px 0 0; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); position: relative; }
.titlebar { display: flex; align-items: center; gap: 18px; height: 44px; padding: 0 16px; font-size: 13px; }
.lights { display: flex; gap: 7px; }
.lights i { width: 12px; height: 12px; border-radius: 50%; background: #FF5F57; }
.lights i:nth-child(2) { background: #FEBC2E; }
.lights i:nth-child(3) { background: #28C840; }
.tabs { display: flex; gap: 4px; margin: 0 auto; }
.tabs b { font-weight: 500; padding: 5px 12px; border-radius: 7px; opacity: 0.6; }
.tabs b.on { opacity: 1; }
.search { font: 400 12px var(--mono); padding: 6px 12px; border-radius: 8px; }

.window-light { background: var(--card); border: 1px solid var(--line); }
.window-light .titlebar { border-bottom: 1px solid var(--line); background: var(--paper-2); }
.window-light .tabs b.on { background: color-mix(in srgb, var(--ink) 9%, transparent); }
.window-light .search { background: var(--card); border: 1px solid var(--line); color: var(--ink-2); }

.lib { display: grid; grid-template-columns: 190px 1fr 240px; min-height: 440px; }
.lib-side { padding: 18px 14px; border-right: 1px solid var(--line); font-size: 13px; background: var(--paper-2); }
.lib-side h4 { margin: 14px 8px 6px; font: 600 10px var(--body); letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-2); }
.lib-side h4:first-child { margin-top: 0; }
.row { display: flex; justify-content: space-between; padding: 5px 8px; border-radius: 6px; }
.row span { color: var(--ink-2); font-variant-numeric: tabular-nums; }
.row.on { background: color-mix(in srgb, var(--coral) 14%, transparent); }
.lib-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; padding: 18px; align-content: start; }
.tile { aspect-ratio: 3 / 2; border-radius: 6px; position: relative; max-width: 100%; }
.tile.sel { outline: 3px solid var(--coral); outline-offset: 2px; }
.tile em, .tile s {
  position: absolute; bottom: 6px; font: 500 9px var(--mono); font-style: normal; text-decoration: none;
  color: #fff; padding: 2px 5px; border-radius: 4px; background: rgba(0, 0, 0, 0.42);
}
.tile em { left: 6px; }
.tile s { right: 6px; color: #FFD27A; letter-spacing: 0.05em; }
.lib-info { border-left: 1px solid var(--line); padding: 18px; display: grid; gap: 10px; align-content: start; font-size: 13px; }
.info-thumb { aspect-ratio: 3 / 2; border-radius: 6px; }
.fname { font: 600 15px var(--body); }
.files { display: flex; gap: 6px; }
.files span { font: 500 11px var(--mono); padding: 2px 7px; border-radius: 5px; border: 1px solid var(--line); color: var(--ink-2); }
.exif { display: grid; grid-template-columns: auto 1fr; gap: 4px 12px; margin: 4px 0; }
.exif dt { color: var(--ink-2); }
.exif dd { margin: 0; font-variant-numeric: tabular-nums; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chips span, .ai-tags span {
  font-size: 12px; padding: 3px 10px; border-radius: 999px; border: 1px solid var(--line); color: var(--ink-2);
}
.chips .ai, .ai-tags .ai { background: var(--ai-soft); color: var(--ai); border-color: transparent; }

/* Placeholder "photographs": layered gradients, no stock images */
.ph-sunset { background: radial-gradient(circle at 70% 62%, #FFE7A8 0 6%, transparent 7%), linear-gradient(180deg, #F27D52 0%, #F9B16E 45%, #6A3B5A 46%, #2D2140 100%); }
.ph-sea { background: radial-gradient(ellipse at 30% 38%, rgba(255, 231, 168, 0.9) 0 8%, transparent 30%), linear-gradient(180deg, #FDB97C 0%, #F59A7A 34%, #3E6D8E 35%, #1F3F5B 70%, #C9A27A 71%, #A57F5E 100%); }
.ph-cliff { background: linear-gradient(155deg, transparent 0 48%, #4A3A33 49% 100%), linear-gradient(180deg, #9FC6E0 0%, #E7D3B8 52%, #2F5874 53%, #1B3346 100%); }
.ph-dune { background: radial-gradient(ellipse at 50% 120%, #C7864B 0 45%, transparent 46%), radial-gradient(ellipse at 10% 110%, #E0A867 0 40%, transparent 41%), linear-gradient(180deg, #F6D9B0, #EFBF85); }
.ph-forest { background: linear-gradient(90deg, transparent 0 18%, rgba(20, 36, 22, 0.7) 18% 22%, transparent 22% 61%, rgba(20, 36, 22, 0.7) 61% 64%, transparent 64%), linear-gradient(180deg, #C8DDB0 0%, #5E8A5A 50%, #24402A 100%); }
.ph-night { background: radial-gradient(circle at 20% 25%, #fff 0 0.6%, transparent 1%), radial-gradient(circle at 62% 18%, #fff 0 0.5%, transparent 0.9%), radial-gradient(circle at 80% 40%, #fff 0 0.5%, transparent 0.9%), radial-gradient(ellipse at 50% 100%, #E8478B 0 20%, transparent 50%), linear-gradient(180deg, #0B1024, #14182B 60%, #2A2045); }
.ph-alpine { background: linear-gradient(140deg, transparent 0 45%, #F4F6F8 46% 52%, #8BA0B4 53% 100%), linear-gradient(220deg, transparent 0 40%, #E9EEF2 41% 48%, #6D8297 49% 100%), linear-gradient(180deg, #7FB2DE, #CFE2F1); }
.ph-dusk { background: radial-gradient(circle at 50% 75%, #FFB547 0 10%, transparent 35%), linear-gradient(180deg, #2C2A5A 0%, #8B4A7E 45%, #F07B5A 75%, #1A1420 76%, #0F0B14 100%); }

/* Darkroom band */
.darkroom {
  background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(255, 138, 61, 0.14), transparent 70%), var(--dr-canvas);
  color: var(--dr-text); padding-block: 112px 120px; position: relative;
}
.darkroom::before {
  content: ""; position: absolute; inset: 0 0 auto; height: 2px;
  background: linear-gradient(90deg, transparent, var(--safelight), transparent); box-shadow: 0 0 24px 4px rgba(255, 138, 61, 0.5);
}
.section-head { display: grid; gap: 18px; max-width: 680px; }
.section-head.center { margin: 0 auto; text-align: center; justify-items: center; }
.section-head h2 { font-size: clamp(42px, 6vw, 76px); }
.section-head p:not(.eyebrow) { font-size: 18px; color: var(--ink-2); }
.darkroom .section-head p:not(.eyebrow) { color: var(--dr-text-2); }
.darkroom h2 em { color: var(--safelight); }
.eyebrow.safelight { color: var(--safelight); }
.window-dark { background: var(--dr-panel); border: 1px solid var(--dr-line); box-shadow: 0 40px 120px -40px rgba(255, 138, 61, 0.25), 0 0 0 1px rgba(0, 0, 0, 0.6); }
.window-dark .titlebar { border-bottom: 1px solid var(--dr-line); color: var(--dr-text-2); }
.window-dark .tabs b.on { background: rgba(255, 138, 61, 0.16); color: var(--safelight); }
.window-dark .search { background: var(--dr-raised); color: var(--dr-text-2); }
.dr { display: grid; grid-template-columns: 1fr 280px; min-height: 480px; }
.dr-canvas { background: var(--dr-canvas); display: grid; place-items: center; padding: 40px; position: relative; }
.dr-photo { width: 100%; max-width: 640px; aspect-ratio: 3 / 2; box-shadow: 0 30px 80px rgba(0, 0, 0, 0.6); }
.dr-meta { position: absolute; bottom: 14px; font: 400 11px var(--mono); color: var(--dr-text-2); letter-spacing: 0.04em; }
.dr-panel { border-left: 1px solid var(--dr-line); padding: 18px; display: grid; gap: 12px; align-content: start; font-size: 13px; }
.histo { width: 100%; height: 64px; background: var(--dr-raised); border-radius: 6px; }
.histo .h-l { fill: rgba(237, 237, 237, 0.28); }
.histo .h-c { fill: rgba(255, 138, 61, 0.35); }
.panel-title { font: 600 10px var(--body); letter-spacing: 0.12em; text-transform: uppercase; color: var(--dr-text-2); margin-top: 6px; }
.slider { display: grid; grid-template-columns: 1fr auto; gap: 6px 8px; color: var(--dr-text-2); }
.slider output { font: 400 12px var(--mono); color: var(--dr-text); font-variant-numeric: tabular-nums; }
.slider i { grid-column: 1 / -1; height: 3px; border-radius: 2px; background: var(--dr-raised); position: relative; }
.slider i::before { content: ""; position: absolute; left: 50%; top: 0; bottom: 0; width: calc((var(--v) - 0.5) * 100%); background: var(--dr-text-2); }
.slider i::after { content: ""; position: absolute; top: 50%; left: calc(var(--v) * 100%); width: 11px; height: 11px; margin: -5.5px 0 0 -5.5px; border-radius: 50%; background: var(--dr-text); }
.slider.on { color: var(--dr-text); }
.slider.on output { color: var(--safelight); }
.slider.on i::before { background: var(--safelight); box-shadow: 0 0 8px var(--safelight); }
.slider.on i::after { background: var(--safelight); box-shadow: 0 0 0 4px rgba(255, 138, 61, 0.25), 0 0 14px var(--safelight); }
.dr-points { list-style: none; padding: 0; margin: 64px 0 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; color: var(--dr-text-2); font-size: 15px; }
.dr-points b { display: block; color: var(--dr-text); font-weight: 600; margin-bottom: 6px; }

/* Feature sections */
.feature { padding-block: 120px 0; }
.feature-grid { display: grid; grid-template-columns: 1fr 1.05fr; gap: 72px; align-items: center; }
.feature-grid.flip > :first-child { order: 2; }
.feature-copy { display: grid; gap: 18px; min-width: 0; }
.feature-copy h2 { font-size: clamp(42px, 5.4vw, 68px); }
.feature-copy p:not(.eyebrow) { color: var(--ink-2); max-width: 32em; }
.ticks { list-style: none; padding: 0; margin: 6px 0 0; display: grid; gap: 10px; }
.ticks li { position: relative; padding-left: 26px; }
.ticks li::before { content: ""; position: absolute; left: 0; top: 0.55em; width: 12px; height: 12px; border-radius: 50%; background: var(--sun); }

.stack-demo { display: grid; grid-template-columns: 1fr auto 1fr; grid-template-rows: repeat(3, auto); gap: 12px 24px; align-items: center; }
.file { grid-column: 1; display: grid; gap: 2px; padding: 14px 16px; border-radius: 10px; background: var(--card); border: 1px solid var(--line); box-shadow: var(--shadow); min-width: 0; }
.file span { font: 500 13px var(--mono); overflow-wrap: anywhere; }
.file small { font-size: 12px; color: var(--ink-2); }
.f2 { margin-left: 16px; } .f3 { margin-left: 32px; }
.stack-arrow { grid-column: 2; grid-row: 1 / 4; width: 48px; height: 2px; background: var(--sun); position: relative; }
.stack-arrow::after { content: ""; position: absolute; right: -2px; top: -5px; border: 6px solid transparent; border-left: 9px solid var(--magenta); border-right: 0; }
.stack-tile { grid-column: 3; grid-row: 1 / 4; background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 10px; box-shadow: var(--shadow); }
.stack-tile div { aspect-ratio: 3 / 2; border-radius: 6px; }
.stack-tile p { display: flex; justify-content: space-between; gap: 8px; flex-wrap: wrap; padding: 10px 4px 2px; font-size: 13px; }
.stack-tile span { color: var(--ink-2); }

.ai-eyebrow { color: var(--ai); }
.feature-ai h2 em { color: var(--ai); }
.privacy { padding: 16px 18px; border-radius: 12px; background: var(--ai-soft); color: var(--ink) !important; font-size: 16px; }
.privacy b { color: var(--ai); }
.ai-demo { display: grid; gap: 16px; }
.ai-card, .ai-suggest { background: var(--card); border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow); }
.ai-card { display: grid; grid-template-columns: 1.2fr 1fr; gap: 16px; padding: 14px; align-items: center; }
.ai-photo { aspect-ratio: 4 / 3; border-radius: 8px; }
.ai-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.ai-tags i { font: 400 10px var(--mono); font-style: normal; opacity: 0.7; margin-left: 4px; }
.ai-suggest { padding: 18px; display: grid; gap: 4px; margin-left: 48px; }
.ai-label { font: 600 10px var(--body); letter-spacing: 0.12em; text-transform: uppercase; color: var(--ai); }
.ai-title { font: 400 24px var(--display); }
.ai-sub { font-size: 13px; color: var(--ink-2); }
.ai-strip { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; margin-top: 10px; }
.ai-strip i { aspect-ratio: 1; border-radius: 5px; }

.post-demo { background: var(--card); border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow); padding: 36px 40px 32px; display: grid; gap: 12px; }
.post-kicker { font: 400 11px var(--mono); color: var(--ink-2); }
.post-demo h3 { font-size: 40px; }
.post-by { font-size: 14px; color: var(--ink-2); }
.post-hero { aspect-ratio: 16 / 9; border-radius: 6px; margin: 8px 0; max-width: 100%; }
.post-body { font: 400 19px/1.55 var(--display); }
.post-cap { font: 400 11px var(--mono); color: var(--ink-2); }
.caret { display: inline-block; width: 2px; height: 1.05em; vertical-align: -0.15em; margin-left: 2px; background: var(--coral); animation: blink 1.1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

/* Sources */
.sources { padding-block: 128px 0; }
.source-list { list-style: none; padding: 0; margin: 56px 0 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.source-list li { display: grid; gap: 6px; padding: 22px; border-radius: 14px; border: 1px solid var(--line); background: var(--card); }
.source-list b { font-size: 17px; }
.source-list span { font-size: 14px; color: var(--ink-2); }
.source-list em { justify-self: start; margin-top: 8px; font: 500 11px var(--mono); font-style: normal; padding: 3px 8px; border-radius: 999px; border: 1px solid var(--line); color: var(--ink-2); }
.source-list em.ok { color: var(--ok); border-color: color-mix(in srgb, var(--ok) 40%, transparent); }

/* Waitlist */
.cta { padding-block: 140px; }
.cta-inner { display: grid; justify-items: center; text-align: center; gap: 22px; }
.cta h2 { font-size: clamp(46px, 7vw, 92px); }
.cta h2 em { background: var(--sun); -webkit-background-clip: text; background-clip: text; color: transparent; }
.cta p:not(.form-status) { color: var(--ink-2); max-width: 32em; font-size: 18px; }
.cta .waitlist { justify-content: center; width: 100%; }
.cta .form-status { text-align: center; padding-left: 0; }

.foot { border-top: 1px solid var(--line); padding-block: 28px; font-size: 14px; color: var(--ink-2); }
.foot-inner { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; }
.foot .brand { color: var(--ink); }

/* Responsive */
@media (max-width: 1000px) {
  .lib { grid-template-columns: 1fr 220px; }
  .lib-side { display: none; }
  .lib-grid { grid-template-columns: repeat(3, 1fr); }
  .dr-points { grid-template-columns: repeat(2, 1fr); }
  .source-list { grid-template-columns: repeat(2, 1fr); }
  .feature-grid { gap: 48px; }
}
@media (max-width: 800px) {
  .nav-links { display: none; }
  .nav-inner .btn { margin-left: auto; }
  .hero { padding-block: 40px 64px; }
  .hero-grid, .feature-grid { grid-template-columns: 1fr; }
  .feature-grid.flip > :first-child { order: 0; }
  .hero-mark { order: -1; justify-self: start; }
  .hero-mark img { width: 120px; }
  .lib { grid-template-columns: 1fr; }
  .lib-info { display: none; }
  .tabs b:not(.on) { display: none; }
  .search { display: none; }
  .dr { grid-template-columns: 1fr; }
  .dr-panel { border-left: 0; border-top: 1px solid var(--dr-line); }
  .dr-canvas { padding: 20px 20px 36px; }
  .window { margin-top: 48px; }
  .darkroom { padding-block: 80px; }
  .feature { padding-block: 88px 0; }
  .ai-suggest { margin-left: 0; }
  .post-demo { padding: 24px; }
  .post-demo h3 { font-size: 32px; }
}
@media (max-width: 520px) {
  .lib-grid { grid-template-columns: repeat(2, 1fr); padding: 12px; }
  .dr-points, .source-list { grid-template-columns: 1fr; }
  .ai-card { grid-template-columns: 1fr; }
  .stack-demo { grid-template-columns: 1fr; }
  .stack-arrow { display: none; }
  .file, .stack-tile { grid-column: 1; grid-row: auto; }
  .f2, .f3 { margin-left: 0; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .caret { animation: none; }
  .btn { transition: none; }
}