/* FRAME / 09 — "Darkroom contact sheet"
   Warm paper by day, safelight darkroom by night. One grease-pencil accent.
   System fonts only: no network fonts, so the page loads instantly everywhere (incl. mainland China). */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", "Noto Sans CJK SC", sans-serif;
  --font-serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Songti SC", "STSong", "Noto Serif SC", "Noto Serif CJK SC", Georgia, serif;
  --font-mono: "SF Mono", "JetBrains Mono", "Cascadia Mono", ui-monospace, Menlo, Consolas, monospace;
  --r-s: 6px; --r-m: 10px; --r-l: 16px;
  --ease: cubic-bezier(.2, .7, .2, 1);
  --gutter: 16px;

  color-scheme: light;
  --bg: #f3efe7;
  --bg-sunken: #e9e3d7;
  --panel: #fbf9f4;
  --panel-2: #ffffff;
  --line: #ddd5c6;
  --line-strong: #c4b9a5;
  --text: #1c1916;
  --muted: #655d52;
  --faint: #978d7e;
  --accent: #c23a1b;
  --accent-ink: #fff8f2;
  --accent-soft: rgba(194, 58, 27, .09);
  --ok: #3f6b3a;
  --warn: #9a5b0b;
  --trim: rgba(28, 25, 22, .55);
  --shadow: 0 1px 2px rgba(60, 45, 25, .06), 0 8px 24px -12px rgba(60, 45, 25, .18);
  --shadow-lg: 0 24px 60px -20px rgba(40, 28, 14, .35);
  --grain: .05;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #13110f; --bg-sunken: #0c0b0a; --panel: #1b1815; --panel-2: #211d19;
    --line: #2f2a24; --line-strong: #463e34;
    --text: #ede6da; --muted: #a59a8a; --faint: #6f665a;
    --accent: #ff6a3d; --accent-ink: #1a0c06; --accent-soft: rgba(255, 106, 61, .12);
    --ok: #9cc58a; --warn: #f0b45a; --trim: rgba(0, 0, 0, .62);
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 10px 30px -14px rgba(0, 0, 0, .7);
    --shadow-lg: 0 30px 80px -20px rgba(0, 0, 0, .8);
    --grain: .07;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #13110f; --bg-sunken: #0c0b0a; --panel: #1b1815; --panel-2: #211d19;
  --line: #2f2a24; --line-strong: #463e34;
  --text: #ede6da; --muted: #a59a8a; --faint: #6f665a;
  --accent: #ff6a3d; --accent-ink: #1a0c06; --accent-soft: rgba(255, 106, 61, .12);
  --ok: #9cc58a; --warn: #f0b45a; --trim: rgba(0, 0, 0, .62);
  --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 10px 30px -14px rgba(0, 0, 0, .7);
  --shadow-lg: 0 30px 80px -20px rgba(0, 0, 0, .8);
  --grain: .07;
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box }
[hidden] { display: none !important }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100% }
body {
  margin: 0; min-height: 100vh; background: var(--bg); color: var(--text);
  font: 16px/1.6 var(--font-sans); -webkit-font-smoothing: antialiased;
  padding-bottom: calc(88px + env(safe-area-inset-bottom));
  overflow-x: hidden;
}
body::before { /* film grain */
  content: ""; position: fixed; inset: 0; pointer-events: none; z-index: 100; opacity: var(--grain);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
button, input, select, textarea { font: inherit; color: inherit }
button { cursor: pointer; -webkit-tap-highlight-color: transparent }
button:disabled { cursor: not-allowed }
a { color: inherit }
p { margin: 0 }
h1, h2, h3 { margin: 0 }
svg { fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px }
.mono { font-family: var(--font-mono); font-feature-settings: "tnum" }
.sr-only { position: absolute; width: 1px; height: 1px; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0 }
.dot { display: inline-block; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); margin-right: 8px; vertical-align: middle; box-shadow: 0 0 0 3px var(--accent-soft) }
.hint { font-size: 13px; color: var(--muted); line-height: 1.6 }
.tag { font-size: 11px; padding: 2px 7px; border-radius: 999px; border: 1px solid var(--line-strong); color: var(--muted); font-weight: 500; white-space: nowrap }

/* ---------- Header ---------- */
.top {
  display: flex; align-items: center; gap: 12px;
  padding: 12px var(--gutter); padding-top: max(12px, env(safe-area-inset-top));
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; min-height: 44px }
.brand-mark { width: 24px; height: 24px; stroke: none }
.brand-mark g { fill: var(--text) }
.brand-mark .core { fill: var(--accent) }
.brand:hover .brand-mark .core { animation: blink .9s var(--ease) }
.brand-name { font-weight: 750; letter-spacing: .06em; font-size: 17px }
.brand-name .mono { color: var(--faint); font-weight: 500; margin-left: 2px; letter-spacing: 0 }
.brand-tag { display: none; font-size: 13px; color: var(--muted); padding-left: 14px; border-left: 1px solid var(--line) }
.prefs { margin-left: auto; display: flex; align-items: center; gap: 6px }
.local { display: none; font-size: 12px; color: var(--muted); margin-right: 10px }
.pref {
  min-width: 44px; height: 44px; padding: 0 12px; border-radius: var(--r-m);
  border: 1px solid var(--line); background: var(--panel); font-size: 13px; font-weight: 600;
  display: inline-grid; place-items: center; transition: border-color .2s, background .2s;
}
.pref:hover { border-color: var(--line-strong) }
.pref-icon svg { width: 18px; height: 18px; grid-area: 1 / 1 }
.pref-icon .i-moon, .pref-icon[data-mode="dark"] .i-sun { display: block }
.pref-icon .i-sun, .pref-icon[data-mode="dark"] .i-moon { display: none }

/* ---------- Hero ---------- */
.hero { padding: 28px var(--gutter) 22px; max-width: 1560px; margin: 0 auto }
.eyebrow { font-size: 11px; letter-spacing: .18em; color: var(--accent); font-weight: 600 }
h1 {
  font-family: var(--font-serif); font-weight: 400; letter-spacing: -.02em; line-height: 1.04;
  font-size: clamp(36px, 9vw, 76px); margin: 12px 0 14px; text-wrap: balance;
}
h1 em { font-style: italic; color: var(--accent) }
.lede { color: var(--muted); max-width: 44ch; font-size: 16px; text-wrap: pretty }
.steps { list-style: none; padding: 0; margin: 22px 0 0; display: flex; gap: 6px; counter-reset: s }
.steps li {
  flex: 1; display: flex; align-items: center; gap: 8px; min-width: 0;
  padding: 10px 12px; border-radius: var(--r-m); border: 1px solid var(--line);
  font-size: 13px; color: var(--muted); background: transparent; transition: all .35s var(--ease);
}
.steps li > span:last-child { overflow: hidden; text-overflow: ellipsis; white-space: nowrap }
.step-no { font-size: 11px; color: var(--faint); white-space: nowrap; flex-shrink: 0 }
@media (max-width: 559px) {
  .steps li { padding: 9px 10px; gap: 6px; font-size: 12px }
  .steps li.is-done .step-no::after { content: "" }
}
.steps li.is-current { border-color: var(--accent); color: var(--text); background: var(--accent-soft) }
.steps li.is-current .step-no { color: var(--accent) }
.steps li.is-done { color: var(--text) }
.steps li.is-done .step-no { color: var(--ok) }
.steps li.is-done .step-no::after { content: " ✓" }

/* ---------- Workspace ---------- */
.workspace { display: grid; gap: 16px; padding: 0 var(--gutter); max-width: 1560px; margin: 0 auto; align-items: start }
.rail { display: contents }
.panel-source { order: 1 }
.sheet { order: 2 }
.panel-export { order: 3 }

.panel, .sheet {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--r-l);
  padding: 18px; box-shadow: var(--shadow); min-width: 0;
}
.panel-head, .sub-head { display: flex; align-items: center; justify-content: space-between; gap: 10px }
h2 { display: flex; align-items: center; gap: 10px; font-size: 16px; font-weight: 650; flex-wrap: wrap }
h3 { font-size: 14px; font-weight: 650 }
.num { font-size: 11px; color: var(--accent); background: var(--accent-soft); padding: 3px 7px; border-radius: 5px; font-weight: 600 }
.link-btn {
  border: 0; background: none; color: var(--accent); font-size: 14px; font-weight: 600;
  padding: 10px 4px; min-height: 44px; border-radius: 6px; white-space: nowrap;
}
.link-btn:hover:not(:disabled) { text-decoration: underline; text-underline-offset: 3px }
.link-btn:disabled { opacity: .4 }

/* Drop zone */
.drop {
  width: 100%; margin-top: 14px; min-height: 200px; padding: 24px 16px;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 12px; text-align: center;
  background: var(--bg-sunken); border: 1.5px dashed var(--line-strong); border-radius: var(--r-m);
  transition: border-color .2s, background .2s, transform .2s var(--ease);
}
.drop:hover:not(:disabled) { border-color: var(--accent); background: var(--accent-soft) }
.drop:active:not(:disabled) { transform: scale(.99) }
.drop strong { font-size: 15px; font-weight: 600 }
.drop small { font-size: 12px; color: var(--muted) }
.drop-grid { display: grid; grid-template-columns: repeat(3, 12px); gap: 4px }
.drop-grid i { width: 12px; height: 12px; border-radius: 3px; border: 1.5px solid var(--line-strong); transition: all .3s var(--ease); transition-delay: calc(var(--d, 0) * 30ms) }
.drop-grid i:nth-child(5) { border-color: var(--accent); background: var(--accent) }
.drop-grid i:nth-child(1) { --d: 0 } .drop-grid i:nth-child(2) { --d: 1 } .drop-grid i:nth-child(3) { --d: 2 }
.drop-grid i:nth-child(4) { --d: 1 } .drop-grid i:nth-child(6) { --d: 3 } .drop-grid i:nth-child(7) { --d: 2 }
.drop-grid i:nth-child(8) { --d: 3 } .drop-grid i:nth-child(9) { --d: 4 }
.drop:hover .drop-grid i, .drag-overlay .drop-grid i { border-color: var(--accent); transform: scale(1.12) }

/* Source preview */
.source { margin-top: 14px }
.source-wrap { position: relative; line-height: 0; border-radius: var(--r-m); overflow: hidden; background: var(--bg-sunken); border: 1px solid var(--line) }
.source-wrap img { width: 100%; display: block; max-height: 60vh; object-fit: contain }
.source-wrap svg { position: absolute; inset: 0; width: 100%; height: 100%; stroke: none }
#overlay .trim { fill: var(--trim) }
#overlay .cell { fill: none; stroke: var(--accent); stroke-width: 1.5; vector-effect: non-scaling-stroke }
#overlay .cell-no { fill: #fff; font-family: var(--font-mono); font-weight: 600; paint-order: stroke; stroke: rgba(0, 0, 0, .55); stroke-width: 3; vector-effect: non-scaling-stroke }
.scan { position: absolute; left: 0; right: 0; top: 0; height: 30%; opacity: 0; pointer-events: none;
  background: linear-gradient(to bottom, transparent, var(--accent-soft) 70%, var(--accent) 100%); }
.is-scanning .scan { opacity: 1; animation: scan 1.2s var(--ease) infinite }
.file-info { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-top: 8px }
.file-text { min-width: 0; display: flex; flex-direction: column }
.filename { font-size: 14px; font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap }
.meta { font-size: 12px; color: var(--muted) }

/* Crop settings */
.crop { margin-top: 18px; padding-top: 18px; border-top: 1px solid var(--line); display: grid; gap: 12px }
.segmented { display: grid; grid-template-columns: 1fr 1fr; gap: 3px; padding: 3px; background: var(--bg-sunken); border-radius: var(--r-m); border: 1px solid var(--line) }
.segmented label { position: relative; display: block; cursor: pointer }
.segmented input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer }
.segmented span {
  display: grid; place-items: center; min-height: 40px; padding: 6px 8px; border-radius: 7px; text-align: center;
  font-size: 14px; color: var(--muted); font-weight: 550; line-height: 1.3; transition: all .2s var(--ease);
}
.segmented input:checked + span { background: var(--panel-2); color: var(--text); box-shadow: var(--shadow) }
.segmented input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 1px }
.segmented input:disabled + span { opacity: .5; cursor: not-allowed }
.status-line { font-size: 13px; line-height: 1.5; min-height: 1.5em; color: var(--muted); padding-left: 14px; position: relative }
.status-line:empty { display: none }
.status-line::before { content: ""; position: absolute; left: 0; top: .5em; width: 6px; height: 6px; border-radius: 50%; background: var(--faint) }
.status-line[data-tone="ok"]::before { background: var(--ok) }
.status-line[data-tone="warn"]::before { background: var(--warn) }
.fields { display: grid; grid-template-columns: 1fr 1fr; gap: 10px }
.field { display: grid; gap: 6px; min-width: 0 }
.field-label { display: flex; justify-content: space-between; font-size: 13px; color: var(--muted); font-weight: 550 }
.field-label em { font-style: normal; color: var(--faint); font-size: 11px }
input:not([type=checkbox]):not([type=radio]), textarea {
  width: 100%; min-width: 0; height: 44px; padding: 0 12px; font-size: 16px;
  background: var(--panel-2); border: 1px solid var(--line); border-radius: var(--r-s); color: var(--text);
  transition: border-color .2s, box-shadow .2s;
}
input:not([type=checkbox]):not([type=radio]):hover { border-color: var(--line-strong) }
input:not([type=checkbox]):not([type=radio]):focus, textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft) }
input:disabled, textarea:disabled { opacity: .55 }

/* Buttons */
.btn {
  position: relative; overflow: hidden; width: 100%; min-height: 50px; padding: 0 18px;
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  border-radius: var(--r-m); border: 1px solid transparent; font-size: 15px; font-weight: 650; letter-spacing: .01em;
  transition: transform .15s var(--ease), filter .2s, background .2s, opacity .2s;
}
.btn svg { width: 19px; height: 19px; flex-shrink: 0; position: relative }
.btn > span:not(.btn-fill) { position: relative }
.btn:active:not(:disabled) { transform: translateY(1px) scale(.995) }
.btn:disabled { opacity: .4 }
.btn-primary { background: var(--accent); color: var(--accent-ink); box-shadow: 0 6px 18px -8px var(--accent) }
.btn-primary:hover:not(:disabled) { filter: brightness(1.08) }
.btn-primary:disabled { box-shadow: none }
.btn-ink { background: var(--text); color: var(--bg) }
.btn-ink:hover:not(:disabled) { filter: brightness(1.15) }
.btn-fill { position: absolute; inset: 0; background: var(--accent); transform: scaleX(0); transform-origin: left; transition: transform .35s var(--ease) }
.btn.is-working { cursor: progress }
.btn.is-working svg { animation: spin 1s linear infinite }
#cut.is-working svg { animation: snip .5s ease-in-out infinite alternate }

/* Export */
.panel-export { display: grid; gap: 14px }
.check { display: flex; gap: 12px; align-items: flex-start; cursor: pointer; padding: 4px 0; position: relative }
.check input { position: absolute; opacity: 0; width: 22px; height: 22px; margin: 0 }
.check-box { width: 22px; height: 22px; border-radius: 6px; border: 1.5px solid var(--line-strong); flex-shrink: 0; display: grid; place-items: center; background: var(--panel-2); transition: all .2s var(--ease) }
.check-box::after { content: ""; width: 10px; height: 6px; border: solid var(--accent-ink); border-width: 0 0 2px 2px; transform: rotate(-45deg) translate(1px, -1px) scale(0); transition: transform .2s var(--ease) }
.check input:checked + .check-box { background: var(--accent); border-color: var(--accent) }
.check input:checked + .check-box::after { transform: rotate(-45deg) translate(1px, -1px) scale(1) }
.check input:focus-visible + .check-box { outline: 2px solid var(--accent); outline-offset: 2px }
.check b { display: block; font-size: 14px; font-weight: 600 }
.check small { display: block; font-size: 12px; color: var(--muted) }

/* ---------- Contact sheet ---------- */
.sheet { padding: 18px 14px }
.sheet-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; padding: 0 4px }
.sheet-head .hint { margin-top: 4px }
.order { font-size: 11px; color: var(--faint); padding-top: 6px; white-space: nowrap }
.film-edge {
  height: 8px; margin: 16px 0 14px; border-radius: 2px; opacity: .8;
  background: radial-gradient(circle at 50% 50%, var(--line-strong) 0 2.2px, transparent 2.6px) 0 0 / 18px 8px repeat-x;
}
.frames { display: grid; grid-template-columns: 1fr; gap: 10px }

.frame {
  display: grid; grid-template-columns: minmax(0, 44%) minmax(0, 1fr); gap: 0; min-width: 0;
  background: var(--panel-2); border: 1px solid var(--line); border-radius: var(--r-m); overflow: hidden;
  transition: border-color .2s, box-shadow .2s;
}
.frame:focus-within { border-color: var(--line-strong) }
.frame.is-ready { animation: settle .5s var(--ease) both; animation-delay: calc(var(--i) * 45ms) }
.frame-media { position: relative; background: var(--bg-sunken); display: flex; align-items: center; min-height: 100% }
.frame-picture {
  display: grid; place-items: center; width: 100%; aspect-ratio: 16 / 10; padding: 0; border: 0;
  background: transparent; overflow: hidden; border-radius: 0;
}
.frame-picture img { width: 100%; height: 100%; object-fit: contain; display: block; transition: transform .45s var(--ease) }
.frame-picture:not(:disabled):hover img { transform: scale(1.035) }
.frame-picture:disabled { cursor: default }
.frame-picture:focus-visible { outline-offset: -3px }
.placeholder {
  font-family: var(--font-serif); font-style: italic; font-size: 34px; color: var(--faint); line-height: 1;
  width: 100%; height: 100%; display: grid; place-items: center;
  background:
    linear-gradient(var(--line-strong), var(--line-strong)) 10px 10px / 12px 1px,
    linear-gradient(var(--line-strong), var(--line-strong)) 10px 10px / 1px 12px,
    linear-gradient(var(--line-strong), var(--line-strong)) right 10px bottom 10px / 12px 1px,
    linear-gradient(var(--line-strong), var(--line-strong)) right 10px bottom 10px / 1px 12px;
  background-repeat: no-repeat;
}
.frame-no {
  position: absolute; top: 8px; left: 8px; font-size: 11px; font-weight: 600; letter-spacing: .04em;
  color: #fff; background: rgba(12, 10, 8, .62); padding: 2px 7px; border-radius: 5px; pointer-events: none;
  -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px);
}
.frame:not(.is-ready) .frame-no { display: none }
.frame-zoom {
  position: absolute; top: 8px; right: 8px; width: 28px; height: 28px; border-radius: 7px; pointer-events: none;
  display: grid; place-items: center; color: #fff; background: rgba(12, 10, 8, .62); opacity: 0; transform: scale(.9); transition: all .2s var(--ease);
}
.frame-zoom svg { width: 14px; height: 14px }
.frame.is-ready .frame-media:hover .frame-zoom, .frame.is-ready .frame-picture:focus-visible + .frame-no + .frame-zoom { opacity: 1; transform: none }
.frame:not(.is-ready) .frame-zoom { display: none }
.frame-body { padding: 10px 12px 6px; display: flex; flex-direction: column; gap: 6px; min-width: 0 }
.frame-meta { display: flex; justify-content: space-between; gap: 8px; font-size: 11px; color: var(--muted) }
.frame-meta > span:first-child { color: var(--accent); font-weight: 600; letter-spacing: .06em }
.frame-meta .dim { overflow: hidden; text-overflow: ellipsis; white-space: nowrap }
.frame textarea {
  height: auto; min-height: 64px; flex: 1; padding: 8px 10px; resize: vertical; line-height: 1.5;
  background: var(--bg-sunken); border-color: transparent; font-size: 16px;
}
.frame textarea::placeholder, .dlg-note::placeholder { color: var(--faint) }
.frame-foot { display: flex; justify-content: space-between; align-items: center; gap: 8px }
.len { font-size: 11px; color: var(--faint) }
.dl { font-size: 13px }
.sheet-foot { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 6px 16px; margin-top: 16px; padding: 0 4px; font-size: 12px; color: var(--muted) }

/* ---------- Footer ---------- */
.foot {
  display: flex; flex-wrap: wrap; gap: 8px 20px; justify-content: space-between; align-items: center;
  max-width: 1560px; margin: 28px auto 0; padding: 20px var(--gutter); border-top: 1px solid var(--line);
  font-size: 12px; color: var(--muted);
}
.foot a { text-decoration: none; padding: 10px 0 }
.foot a:hover { color: var(--accent) }

/* ---------- Mobile dock ---------- */
.dock {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 20;
  padding: 12px var(--gutter) calc(12px + env(safe-area-inset-bottom));
  background: color-mix(in srgb, var(--panel) 86%, transparent);
  -webkit-backdrop-filter: blur(14px) saturate(1.2); backdrop-filter: blur(14px) saturate(1.2);
  border-top: 1px solid var(--line);
}
[data-stage="done"] .dock .btn { background: var(--text); color: var(--bg); box-shadow: none }

/* ---------- Drag overlay ---------- */
.drag-overlay {
  position: fixed; inset: 0; z-index: 60; display: grid; place-items: center; padding: 24px;
  background: color-mix(in srgb, var(--bg) 82%, transparent); -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px);
  opacity: 0; visibility: hidden; transition: opacity .2s, visibility .2s; pointer-events: none;
}
.drag-overlay.show { opacity: 1; visibility: visible }
.drag-box {
  width: min(560px, 100%); aspect-ratio: 16 / 10; border: 2px dashed var(--accent); border-radius: var(--r-l);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 18px; background: var(--accent-soft);
}
.drag-box strong { font-family: var(--font-serif); font-weight: 400; font-style: italic; font-size: clamp(26px, 5vw, 40px) }
.drag-box .drop-grid { grid-template-columns: repeat(3, 18px); gap: 6px }
.drag-box .drop-grid i { width: 18px; height: 18px }

/* ---------- Toast ---------- */
.toast {
  position: fixed; left: 50%; bottom: calc(92px + env(safe-area-inset-bottom)); z-index: 70;
  max-width: min(92vw, 520px); padding: 11px 18px 11px 16px; border-radius: 999px;
  background: var(--text); color: var(--bg); font-size: 14px; font-weight: 550; box-shadow: var(--shadow-lg);
  display: flex; align-items: center; gap: 10px; line-height: 1.4;
  opacity: 0; visibility: hidden; transform: translate(-50%, 12px); transition: all .3s var(--ease); pointer-events: none;
}
.toast::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--faint); flex-shrink: 0 }
.toast[data-kind="ok"]::before { background: #7fc46b }
.toast[data-kind="warn"]::before { background: #f0b45a }
.toast[data-kind="error"]::before { background: #ff6a3d }
.toast.show { opacity: 1; visibility: visible; transform: translate(-50%, 0) }

/* ---------- Preview dialog ---------- */
dialog {
  width: min(1120px, calc(100vw - 24px)); max-width: none; max-height: calc(100dvh - 24px); padding: 0;
  background: var(--panel); color: var(--text); border: 1px solid var(--line); border-radius: var(--r-l); box-shadow: var(--shadow-lg);
  overflow: auto;
}
dialog[open] { animation: pop .28s var(--ease) }
dialog::backdrop { background: rgba(10, 8, 6, .78); -webkit-backdrop-filter: blur(4px); backdrop-filter: blur(4px) }
.dlg-head { display: flex; align-items: center; gap: 12px; padding: 8px 8px 8px 16px; border-bottom: 1px solid var(--line); position: sticky; top: 0; background: var(--panel); z-index: 1 }
.dlg-shot { color: var(--accent); font-weight: 600; letter-spacing: .06em; font-size: 13px }
.dlg-nav { margin-left: auto; display: flex; gap: 4px }
.icon-btn { width: 44px; height: 44px; display: grid; place-items: center; border-radius: var(--r-m); border: 1px solid transparent; background: none }
.icon-btn:hover:not(:disabled) { background: var(--bg-sunken); border-color: var(--line) }
.icon-btn:disabled { opacity: .3 }
.icon-btn svg { width: 20px; height: 20px }
.dlg-figure { background: var(--bg-sunken); display: grid; place-items: center; line-height: 0 }
.dlg-figure img { max-width: 100%; max-height: 66dvh; object-fit: contain; display: block }
.dlg-note { display: block; width: calc(100% - 24px); margin: 12px; height: auto; min-height: 64px; padding: 10px 12px; resize: vertical; line-height: 1.55; background: var(--bg-sunken); border-color: transparent }

/* ---------- Busy state ---------- */
body.is-busy { cursor: progress }

/* ---------- Motion ---------- */
@keyframes settle { from { opacity: 0; transform: translateY(8px) scale(.985) } to { opacity: 1; transform: none } }
@keyframes pop { from { opacity: 0; transform: translateY(10px) scale(.98) } to { opacity: 1; transform: none } }
@keyframes scan { 0% { transform: translateY(-100%) } 100% { transform: translateY(340%) } }
@keyframes spin { to { transform: rotate(360deg) } }
@keyframes snip { from { transform: rotate(-8deg) } to { transform: rotate(8deg) } }
@keyframes blink { 50% { opacity: .2 } }

/* ---------- ≥ 560px: card grid ---------- */
@media (min-width: 560px) {
  :root { --gutter: 24px }
  .frames { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px }
  .frame { grid-template-columns: 1fr; grid-template-rows: auto 1fr }
  .frame-media { min-height: 0 }
  .brand-tag { display: inline }
  .sheet { padding: 20px 16px }
}

/* ---------- ≥ 760px ---------- */
@media (min-width: 760px) {
  .hero { display: grid; grid-template-columns: minmax(0, 1fr) auto; column-gap: 40px; align-items: end; padding-top: 44px; padding-bottom: 30px }
  .hero .eyebrow, .hero h1, .hero .lede { grid-column: 1 }
  .steps { grid-column: 2; grid-row: 1 / span 3; align-self: end; margin: 0; flex-direction: column; width: 220px }
  .local { display: inline }
  .toast { bottom: calc(96px + env(safe-area-inset-bottom)) }
}

/* ---------- ≥ 1024px: two-column workbench, sticky rail ---------- */
@media (min-width: 1024px) {
  body { padding-bottom: 0; font-size: 15px }
  .dock { display: none }
  .toast { bottom: 28px }
  .workspace { grid-template-columns: 340px minmax(0, 1fr); gap: 20px }
  .rail {
    display: flex; flex-direction: column; gap: 16px; position: sticky; top: 16px;
    max-height: calc(100dvh - 32px); overflow-y: auto; scrollbar-width: thin; border-radius: var(--r-l);
  }
  .panel-source, .panel-export, .sheet { order: 0 }
  .steps { width: 240px }
  input:not([type=checkbox]):not([type=radio]), .frame textarea, .dlg-note { font-size: 14px }
  .frame textarea { min-height: 56px }
  .link-btn { min-height: 36px; padding: 6px 4px; font-size: 13px }
  .dl { min-height: 32px }
  .segmented span { min-height: 36px; font-size: 13px }
  .btn { min-height: 48px; font-size: 14px }
  .sheet { padding: 22px 20px }
  .drop { min-height: 220px }
  .source-wrap img { max-height: 42vh }
}

/* ---------- ≥ 1280px: true 3 × 3 contact sheet ---------- */
@media (min-width: 1280px) {
  :root { --gutter: 32px }
  .workspace { grid-template-columns: 360px minmax(0, 1fr); gap: 24px }
  .frames { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px }
}

/* ---------- Pointer devices: subtle hover lift ---------- */
@media (hover: hover) {
  .frame.is-ready:hover { box-shadow: var(--shadow); border-color: var(--line-strong) }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; scroll-behavior: auto !important }
}