:root {
  --bg: #f3efe8;
  --ink: #1c1916;
  --muted: #6b645c;
  --panel: #fffcf7;
  --panel-2: #f7f2ea;
  --line: #ddd4c8;
  --accent: #2f5d50;
  --accent-ink: #f4faf7;
  --stage: #dfe8e4;
  --f-ui: "IBM Plex Sans", system-ui, sans-serif;
  --f-display: "Source Serif 4", Georgia, serif;
  color-scheme: light;
}
html[data-theme="dark"] {
  --bg: #141210;
  --ink: #f2ebe3;
  --muted: #a39a90;
  --panel: #1c1916;
  --panel-2: #24201c;
  --line: #3a342e;
  --accent: #7eb7a5;
  --accent-ink: #102019;
  --stage: #1a2220;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  font: 400 14.5px/1.45 var(--f-ui);
  color: var(--ink);
  background:
    radial-gradient(900px 480px at 0% -10%, color-mix(in srgb, var(--accent) 14%, transparent), transparent 55%),
    var(--bg);
}
a { color: var(--accent); }
button, input { font: inherit; color: inherit; }
[hidden] { display: none !important; }

.top {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  padding: 10px 16px; background: var(--panel); border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 20;
}
.brand { display: flex; align-items: baseline; gap: 10px; text-decoration: none; color: inherit; }
.brand strong { font: 700 22px/1 var(--f-display); font-style: italic; }
.brand span { color: var(--muted); font-size: 13px; }
.crumbs { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; color: var(--muted); font-size: 13px; min-width: 0; }
.crumbs a { color: var(--muted); text-decoration: none; }
.crumbs a:hover { color: var(--accent); }
.crumbs .sep { opacity: .5; }
.grow { flex: 1; }
.search {
  min-width: 180px; max-width: 280px; width: 28vw;
  padding: 7px 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--panel-2);
}
.btn {
  border: 1px solid var(--line); background: var(--panel); border-radius: 8px;
  padding: 7px 11px; cursor: pointer; font-weight: 500;
}
.btn:hover { border-color: var(--muted); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }

.shell { max-width: 1100px; margin: 0 auto; padding: 28px 18px 64px; }
.shell.wide { max-width: none; padding: 0; height: calc(100% - 53px); display: flex; flex-direction: column; }

h1 { margin: 0 0 8px; font: 600 34px/1.15 var(--f-display); letter-spacing: -0.02em; }
h2 { margin: 0 0 6px; font: 600 24px/1.2 var(--f-display); }
.lead { margin: 0 0 22px; color: var(--muted); max-width: 62ch; }

.grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px;
}
.card {
  display: grid; gap: 8px; padding: 18px 16px; text-decoration: none; color: inherit;
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px;
}
.card:hover { border-color: var(--accent); }
.card .tag { font: 600 11px/1 var(--f-ui); letter-spacing: .08em; text-transform: uppercase; color: var(--accent); }
.card p { margin: 0; color: var(--muted); font-size: 13px; }
.card .cta { font-weight: 600; color: var(--accent); font-size: 13px; }

.studio {
  margin: 0 0 18px; padding: 14px 16px; border-radius: 12px;
  border: 1px dashed color-mix(in srgb, var(--accent) 55%, var(--line));
  background: color-mix(in srgb, var(--accent) 8%, var(--panel));
  display: flex; flex-wrap: wrap; gap: 12px; align-items: center; justify-content: space-between;
}
.studio p { margin: 0; color: var(--muted); font-size: 13.5px; max-width: 55ch; }

.list { display: grid; gap: 8px; }
.row {
  display: flex; gap: 12px; align-items: baseline; padding: 12px 14px;
  background: var(--panel); border: 1px solid var(--line); border-radius: 10px;
  text-decoration: none; color: inherit;
}
.row:hover { border-color: var(--accent); }
.row .n { font: 600 12px/1 ui-monospace, monospace; color: var(--muted); width: 2ch; }
.row .meta { margin-left: auto; color: var(--muted); font-size: 12.5px; }

.article-layout {
  display: grid; grid-template-columns: minmax(220px, 300px) minmax(0, 1fr); min-height: calc(100vh - 53px);
}
.toc {
  background: var(--panel); border-right: 1px solid var(--line); overflow: auto; padding: 14px 0 24px;
}
.toc h3 { margin: 0 14px 10px; font-size: 12px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.toc a {
  display: block; padding: 8px 14px; text-decoration: none; color: inherit; border-left: 3px solid transparent;
}
.toc a:hover { background: var(--panel-2); }
.toc a.on { background: color-mix(in srgb, var(--accent) 12%, var(--panel)); border-left-color: var(--accent); font-weight: 600; }
.toc a.gap { opacity: .78; }
.toc .sub { display: block; color: var(--muted); font-size: 12px; font-weight: 400; }
.gap-banner {
  margin: 0 14px 12px; padding: 10px 12px; border-radius: 8px; font-size: 12.5px; line-height: 1.4;
  color: var(--muted); background: var(--panel-2); border: 1px solid var(--line);
}
.stage-wrap { display: flex; flex-direction: column; min-width: 0; background: var(--stage); }
.stage-bar {
  display: flex; gap: 10px; align-items: center; flex-wrap: wrap;
  padding: 10px 14px; background: var(--panel); border-bottom: 1px solid var(--line);
}
.stage-bar h2 { margin: 0; font-size: 18px; }
.viewer {
  flex: 1; min-height: 420px; border: 0; width: 100%; background: #0000;
}
.missing-stage {
  flex: 1; display: grid; align-content: center; justify-items: start; gap: 10px;
  padding: 36px 28px; max-width: 52rem;
}
.missing-stage .tag {
  margin: 0; font: 600 11px/1 var(--f-ui); letter-spacing: .08em; text-transform: uppercase; color: var(--accent);
}
.missing-stage h2 { margin: 0; font: 600 28px/1.2 var(--f-display); }
.missing-stage p { margin: 0; color: var(--ink); max-width: 58ch; }
.missing-stage .muted { color: var(--muted); font-size: 13px; }
.missing-stage code {
  font: 500 12px/1.3 ui-monospace, SFMono-Regular, Menlo, monospace;
  padding: 1px 5px; border-radius: 4px; background: var(--panel); border: 1px solid var(--line);
}
.credit {
  margin-top: 36px; font-size: 12.5px; color: var(--muted);
}
.credit a { color: var(--accent); }
.empty {
  padding: 48px 20px; text-align: center; color: var(--muted);
}
@media (max-width: 820px) {
  .article-layout { grid-template-columns: 1fr; }
  .toc { max-height: 220px; border-right: 0; border-bottom: 1px solid var(--line); }
  .search { width: 100%; max-width: none; }
}