/* Layout: drafting desk. Toolbar across the top, the chosen sheet (or two, side by side) on the desk, sheet index down the right (a strip along the bottom on phones). */
:root {
  --desk: #e4e7e2;
  --chrome: #f6f7f4;
  --ink: #1f2d4d;
  --text: #17222b;
  --muted: #5d6a74;
  --line: rgba(31, 45, 77, 0.14);
  --accent: #1d6a61;
  --accent-ink: #ffffff;
  --hover: rgba(29, 106, 97, 0.09);
  --paper: #fbfaf5;
  --paper-edge: rgba(31, 45, 77, 0.18);
  --star: #c08a1e;
  --shadow: 0 1px 2px rgba(20, 30, 40, 0.08), 0 8px 24px rgba(20, 30, 40, 0.1);

  --font-display: "Bricolage Grotesque", "Avenir Next", "Segoe UI", system-ui, sans-serif;
  --font-body: "IBM Plex Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --desk: #12191c;
    --chrome: #172125;
    --ink: #1f2d4d;
    --text: #e3ece9;
    --muted: #9aaeab;
    --line: rgba(227, 236, 233, 0.12);
    --accent: #63b8ab;
    --accent-ink: #08201c;
    --hover: rgba(99, 184, 171, 0.13);
    --paper: #fbfaf5;
    --paper-edge: rgba(0, 0, 0, 0.5);
    --star: #e2b04a;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --desk: #12191c;
  --chrome: #172125;
  --ink: #1f2d4d;
  --text: #e3ece9;
  --muted: #9aaeab;
  --line: rgba(227, 236, 233, 0.12);
  --accent: #63b8ab;
  --accent-ink: #08201c;
  --hover: rgba(99, 184, 171, 0.13);
  --paper: #fbfaf5;
  --paper-edge: rgba(0, 0, 0, 0.5);
  --star: #e2b04a;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
  color-scheme: dark;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--desk);
  color: var(--text);
  font: 14px/1.45 var(--font-body);
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
  -webkit-font-smoothing: antialiased;
}

.app {
  height: 100%;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 290px;
  grid-template-rows: auto minmax(0, 1fr);
  grid-template-areas: "top top" "stage sheets";
  gap: 14px;
  padding-block: 14px;
}

/* ---------- toolbar ---------- */

.top {
  grid-area: top;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 20px;
}
.brand { display: grid; gap: 2px; }
.eyebrow {
  margin: 0;
  font: 500 11px/1 var(--font-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}
h1 {
  margin: 0;
  font: 700 24px/1.1 var(--font-display);
  letter-spacing: -0.01em;
}
.tools {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.seg {
  display: flex;
  gap: 2px;
  padding: 3px;
  border-radius: 11px;
  background: var(--chrome);
  border: 1px solid var(--line);
}
.seg button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 11px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--text);
  font: 500 13px/1 var(--font-body);
  cursor: pointer;
  white-space: nowrap;
}
.seg button:hover { background: var(--hover); }
.seg button[aria-pressed="true"] { background: var(--accent); color: var(--accent-ink); }
.dot { width: 10px; height: 10px; border-radius: 50%; box-shadow: 0 0 0 1.5px var(--chrome); }
.dot.teal { background: #1d6a61; }
.dot.terracotta { background: #c5573c; }

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 11px;
  background: var(--chrome);
  border: 1px solid var(--line);
  font: 500 13px/1 var(--font-body);
  cursor: pointer;
}
.toggle input {
  appearance: none;
  -webkit-appearance: none;
  margin: 0;
  width: 28px;
  height: 16px;
  border-radius: 99px;
  background: var(--line);
  position: relative;
  cursor: pointer;
}
.toggle input::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--chrome);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
  transition: transform 0.15s;
}
.toggle input:checked { background: var(--accent); }
.toggle input:checked::after { transform: translateX(12px); }

.open3d {
  padding: 9px 14px;
  border-radius: 11px;
  background: var(--text);
  color: var(--desk);
  font: 600 13px/1 var(--font-body);
  text-decoration: none;
  white-space: nowrap;
}
.open3d:hover { background: var(--accent); color: var(--accent-ink); }

/* ---------- stage ---------- */

.stage {
  grid-area: stage;
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}
.stage.is-compare { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.pane {
  margin: 0;
  min-height: 0;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.pane figcaption {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 34px;
}
.slot {
  display: none;
  padding: 3px 7px;
  border-radius: 6px;
  background: var(--line);
  font: 600 10.5px/1 var(--font-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.is-compare .slot { display: inline-block; }
.is-compare .pane.is-active .slot { background: var(--accent); color: var(--accent-ink); }
.pane .no {
  font: 500 12px/1 var(--font-mono);
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.pane .name { display: flex; align-items: baseline; gap: 8px; min-width: 0; flex: 1; }
.pane .name b { font: 600 16px/1.2 var(--font-display); white-space: nowrap; }
.pane .name small { color: var(--muted); font-size: 12.5px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.fav, .zoom {
  flex: none;
  border: 1px solid var(--line);
  background: var(--chrome);
  color: var(--text);
  border-radius: 9px;
  padding: 6px 10px;
  font: 500 12.5px/1 var(--font-body);
  cursor: pointer;
}
.fav { font-size: 16px; padding: 3px 9px; color: var(--muted); }
.fav[aria-pressed="true"] { color: var(--star); border-color: var(--star); }
.fav:hover, .zoom:hover { background: var(--hover); }

.paper {
  position: relative;
  flex: 1;
  min-height: 0;
  background: var(--paper);
  border: 1px solid var(--paper-edge);
  border-radius: 4px;
  box-shadow: var(--shadow);
  overflow: hidden;
  display: grid;
  place-items: center;
}
.is-compare .pane.is-active .paper { outline: 2px solid var(--accent); outline-offset: 3px; }
.is-compare .pane { cursor: pointer; }
.paper > svg { width: 100%; height: 100%; display: block; }
.pane.is-zoomed .paper { overflow: auto; place-items: start; }
.pane.is-zoomed .paper > svg { width: 240%; height: auto; }

.loading {
  margin: 0;
  color: #6d7a94;
  font: 500 12px/1.4 var(--font-mono);
  text-align: center;
  padding: 12px;
  animation: pulse 1.4s ease-in-out infinite;
}
.loading.big { font-size: 14px; }
@keyframes pulse { 50% { opacity: 0.45; } }

/* ---------- sheet index ---------- */

.sheets {
  grid-area: sheets;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.sheets-head {
  margin: 0;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font: 600 13px/1.2 var(--font-body);
}
.progress { font: 400 11.5px/1 var(--font-mono); color: var(--muted); }
.sheets-hint { margin: 0 0 4px; font-size: 12px; color: var(--muted); }

.cards {
  min-height: 0;
  overflow-y: auto;
  display: grid;
  gap: 10px;
  padding: 2px 4px 12px 2px;
  align-content: start;
}
.card {
  position: relative;
  display: grid;
  gap: 7px;
  padding: 7px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--chrome);
  color: var(--text);
  text-align: left;
  font: inherit;
  cursor: pointer;
}
.card:hover { border-color: var(--accent); }
.card[aria-pressed="true"] { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.thumb {
  aspect-ratio: 16 / 10;
  max-width: 100%;
  border-radius: 4px;
  background: var(--paper);
  border: 1px solid var(--paper-edge);
  overflow: hidden;
  display: grid;
  place-items: center;
}
.thumb > svg { width: 100%; height: 100%; display: block; }
.meta { display: grid; grid-template-columns: auto 1fr; column-gap: 8px; align-items: baseline; }
.meta .no { font: 500 11px/1 var(--font-mono); color: var(--muted); }
.meta .title { font-weight: 600; font-size: 13.5px; }
.meta .sub { grid-column: 2; font-size: 11.5px; color: var(--muted); }
.badge {
  position: absolute;
  top: 12px;
  left: 12px;
  min-width: 22px;
  padding: 4px 6px;
  border-radius: 6px;
  background: var(--accent);
  color: var(--accent-ink);
  font: 600 11px/1 var(--font-mono);
  text-align: center;
}
.badge:empty { display: none; }
.star {
  position: absolute;
  top: 10px;
  right: 12px;
  color: var(--star);
  font-size: 16px;
  text-shadow: 0 0 3px var(--paper);
  display: none;
}
.card.is-fav .star { display: block; }

button:focus-visible, a:focus-visible, .toggle input:focus-visible, .paper:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.noscript { position: fixed; inset: 40% 16px auto; text-align: center; }

/* ---------- narrow screens ---------- */

@media (max-width: 860px) {
  .app {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto minmax(0, 1fr) auto;
    grid-template-areas: "top" "stage" "sheets";
    gap: 10px;
    padding-block: 10px;
  }
  h1 { font-size: 20px; }
  .tools { width: 100%; }
  .stage.is-compare { grid-template-columns: minmax(0, 1fr); grid-template-rows: repeat(2, minmax(0, 1fr)); }
  .sheets-hint { display: none; }
  .cards {
    grid-auto-flow: column;
    grid-auto-columns: 150px;
    overflow-x: auto;
    overflow-y: hidden;
    padding-bottom: 4px;
  }
  .meta .sub { display: none; }
  .pane .name small { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}