:root {
  --bg: #fcfaf7;
  --fg: #181818;
  --muted: #6a6a6a;
  --line: #e1dfdd;
  --hover: #f2f0ed;
  --accent: #3772bb;
  --overlay: #ffffff;
  --iso-paper: #ffffff;
  --iso-soft: #e3dfda;
  --iso-ink: #2b2927;
  --iso-accent: #3772bb;
  --sans: "Geist Variable", system-ui, sans-serif;
  --mono: "Geist Mono Variable", ui-monospace, monospace;
  color-scheme: light;
}

:root.dark {
  --bg: #131110;
  --fg: #f3f1f0;
  --muted: #94928f;
  --line: #2c2b29;
  --hover: #252422;
  --accent: #69a1e8;
  --overlay: #1c1a19;
  --iso-paper: #2e2b29;
  --iso-soft: #45413d;
  --iso-ink: #d8d4cf;
  --iso-accent: #69a1e8;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body { margin: 0; background: var(--bg); color: var(--fg); }

body {
  font: 400 16px/24px var(--sans);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 8px; }

.skip { position: absolute; left: 16px; top: -48px; padding: 8px 12px; background: var(--fg); color: var(--bg); border-radius: 8px; z-index: 30; }
.skip:focus { top: 8px; }

.icon { display: inline-flex; width: 24px; height: 24px; flex: none; }
.icon svg { width: 24px; height: 24px; }

.label { font: 500 12px/16px var(--mono); text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }

/* Geometry: circle, square, triangle, the site's three marks. */
i.circle, i.square, i.triangle { display: inline-block; width: 16px; height: 16px; flex: none; }
i.circle { border-radius: 50%; background: var(--accent); }
i.square { background: var(--fg); }
i.triangle { background: var(--fg); clip-path: polygon(50% 0, 100% 100%, 0 100%); }

/* The dioramas' one canvas; each draws in its host's box. */
canvas.iso { position: fixed; inset: 0; width: 100vw; height: 100vh; pointer-events: none; z-index: 5; }
.iso-host { position: relative; cursor: crosshair; }

/* Header */
.bar {
  position: sticky; top: 0; z-index: 20; height: 56px;
  display: flex; align-items: center; gap: 24px; padding: 0 24px;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}
.bar .mark { font-weight: 600; font-size: 18px; line-height: 28px; }
.bar nav { display: flex; gap: 4px; }
.bar .end { margin-left: auto; display: flex; align-items: center; gap: 4px; }
.link { padding: 4px 12px; border-radius: 8px; font-size: 14px; line-height: 20px; font-weight: 500; color: var(--muted); }
.link:hover, .link[aria-current="page"], .link[aria-expanded="true"] { color: var(--fg); }
.tool { width: 32px; height: 32px; display: inline-flex; align-items: center; justify-content: center; border-radius: 8px; color: var(--muted); }
.tool:hover, .tool[aria-pressed="true"] { color: var(--fg); }
.find { display: inline-flex; align-items: center; gap: 8px; height: 32px; padding: 0 8px 0 4px; border-radius: 8px; color: var(--muted); font-size: 14px; }
.find:hover { color: var(--fg); }
.find kbd { font: 500 12px/16px var(--mono); }

/* Cascading menu */
.menu {
  position: fixed; z-index: 25; min-width: 240px; max-height: min(480px, 70vh); overflow-y: auto;
  padding: 4px; background: var(--overlay); border: 1px solid var(--line); border-radius: 12px;
  box-shadow: 0 12px 32px rgb(0 0 0 / 0.12);
}
.menu a, .menu button { display: flex; align-items: center; justify-content: space-between; gap: 12px; width: 100%; padding: 4px 8px; min-height: 32px; border-radius: 8px; font-size: 14px; line-height: 20px; text-align: left; }
.menu a:hover, .menu button:hover, .menu [aria-expanded="true"], .menu :focus-visible { background: var(--hover); outline: none; }

/* Components page */
.docs { display: grid; grid-template-columns: 264px minmax(0, 1fr); min-height: calc(100vh - 56px); }
.side { position: sticky; top: 56px; height: calc(100vh - 56px); overflow-y: auto; padding: 24px 16px 48px; border-right: 1px solid var(--line); }
.side input { appearance: none; width: 100%; height: 32px; margin-bottom: 16px; padding: 0 12px; font: inherit; font-size: 14px; color: var(--fg); background: transparent; border: 1px solid var(--line); border-radius: 8px; }
.side input::placeholder { color: var(--muted); }
.side input:focus-visible { outline: 2px solid var(--accent); outline-offset: 0; }
.side .chapter { display: flex; gap: 8px; align-items: center; width: 100%; padding: 4px 0; min-height: 32px; font-size: 14px; line-height: 20px; color: var(--muted); }
.side .chapter .n { font: 500 12px/16px var(--mono); width: 24px; }
.side .chapter:hover { color: var(--fg); }
.side .chapter[aria-current="true"] { color: var(--fg); font-weight: 500; }
.side ul { list-style: none; margin: 0 0 8px; padding: 0 0 0 32px; }
.side li a { display: block; padding: 4px 0; font-size: 14px; line-height: 20px; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.side li a:hover { color: var(--fg); }
.side li a[aria-current="page"] { color: var(--fg); font-weight: 500; }
.side .none { padding: 8px 0; font-size: 14px; color: var(--muted); }

.detail { padding: 48px 48px 96px; max-width: 1136px; }
.crumb { font-size: 14px; line-height: 20px; color: var(--muted); }
.crumb a:hover { color: var(--fg); }
.detail h1 { margin: 4px 0 4px; font-size: 18px; line-height: 28px; font-weight: 600; }
.names { margin: 0 0 32px; font: 500 12px/16px var(--mono); color: var(--muted); }

.stage { position: relative; height: 640px; overflow: hidden; background: var(--bg); }
.stage iframe { display: block; width: 100%; height: 100%; border: 0; background: var(--bg); }
.stage .state { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; gap: 8px; font-size: 14px; color: var(--muted); background: var(--bg); }
.stage .state[hidden] { display: none; }
.stage .actions { position: absolute; top: 8px; right: 8px; display: flex; gap: 4px; opacity: 0; transition: opacity 150ms ease-out; }
.stage:hover .actions, .stage:focus-within .actions { opacity: 1; }
.stage .actions .tool { background: var(--bg); }
.stage.full { position: fixed; inset: 0; z-index: 40; height: auto; }
.spin { width: 16px; height: 16px; border: 1.5px solid var(--line); border-top-color: var(--muted); border-radius: 50%; animation: spin 800ms linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.stage-skip { position: absolute; left: -9999px; }
.stage-skip:focus { position: static; display: inline-block; margin-bottom: 8px; font-size: 14px; color: var(--accent); }

.pager { display: flex; justify-content: space-between; gap: 16px; margin-top: 32px; padding-top: 16px; border-top: 1px solid var(--line); }
.pager a { display: flex; flex-direction: column; gap: 4px; max-width: 48%; font-size: 14px; line-height: 20px; }
.pager a:hover { color: var(--accent); }
.pager a.next { text-align: right; margin-left: auto; }
.pager .label { display: flex; align-items: center; gap: 4px; }
.pager a.next .label { justify-content: flex-end; }

.index { padding: 48px; max-width: 1136px; }
.index h1 { margin: 0 0 8px; font-size: 18px; line-height: 28px; font-weight: 600; }
.index p { margin: 0 0 48px; color: var(--muted); max-width: 640px; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 0 24px; border-top: 1px solid var(--line); }
.grid a { display: flex; gap: 12px; align-items: baseline; padding: 16px 0; border-bottom: 1px solid var(--line); }
.grid a:hover strong { color: var(--accent); }
.grid .n { font: 500 12px/16px var(--mono); color: var(--muted); width: 24px; }
.grid strong { font-weight: 500; display: block; }
.grid small { font-size: 14px; line-height: 20px; color: var(--muted); }

/* Palette */
.scrim { position: fixed; inset: 0; z-index: 50; background: rgb(0 0 0 / 0.24); display: flex; justify-content: center; align-items: flex-start; padding: 96px 16px 16px; }
.palette { width: min(640px, 100%); max-height: calc(100vh - 128px); display: flex; flex-direction: column; background: var(--overlay); border: 1px solid var(--line); border-radius: 16px; box-shadow: 0 24px 64px rgb(0 0 0 / 0.2); overflow: hidden; }
.palette input { flex: none; appearance: none; height: 56px; padding: 0 16px; font: inherit; color: var(--fg); background: transparent; border: 0; border-bottom: 1px solid var(--line); outline: none; }
.palette ol { list-style: none; margin: 0; padding: 4px; overflow-y: auto; }
.palette li a { display: flex; justify-content: space-between; gap: 16px; padding: 8px 12px; border-radius: 8px; font-size: 14px; line-height: 20px; }
.palette li a span:last-child { color: var(--muted); white-space: nowrap; }
.palette li[aria-selected="true"] a { background: var(--hover); }
.palette .none { padding: 16px; color: var(--muted); font-size: 14px; }

/* Home */
.hero { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); align-items: center; gap: 48px; min-height: calc(100vh - 56px); padding: 48px; }
.hero-iso { height: min(720px, calc(100vh - 152px)); }
.words { max-width: 440px; }
.glyphs { display: flex; gap: 8px; margin-bottom: 32px; }
.hero h1 { margin: 0 0 16px; font-size: 18px; line-height: 28px; font-weight: 400; }
.hero h1 strong { display: block; font-weight: 600; }
.hero p { margin: 0 0 32px; color: var(--muted); }
.cta { display: flex; gap: 12px; flex-wrap: wrap; }
.button { display: inline-flex; align-items: center; gap: 8px; height: 40px; padding: 0 16px; border-radius: 12px; font-size: 14px; font-weight: 500; }
.button:hover { color: var(--accent); }
.button.primary { background: var(--fg); color: var(--bg); }
.button.primary:hover { color: var(--bg); opacity: 0.88; }

.show { padding: 96px 48px 48px; border-top: 1px solid var(--line); }
.show .mark { display: grid; grid-template-columns: 16px 32px auto; align-items: center; column-gap: 16px; row-gap: 8px; margin-bottom: 48px; }
.show .mark .n { font: 500 12px/16px var(--mono); color: var(--muted); }
.show .mark h2 { margin: 0; font-size: 18px; line-height: 28px; font-weight: 600; }
.show .mark p { grid-column: 3; margin: 0; max-width: 560px; color: var(--muted); }
.pair { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 48px; align-items: center; margin-bottom: 48px; }
.show .mark { margin-bottom: 0; }
.pair .iso-host { height: 400px; }
.show .stage { height: 640px; }

.facts { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 48px; padding: 96px 48px; border-top: 1px solid var(--line); }
.facts strong { display: block; font: 500 18px/28px var(--mono); }
.facts span { color: var(--muted); font-size: 14px; line-height: 20px; }

.foot { padding: 24px 48px; border-top: 1px solid var(--line); font-size: 12px; line-height: 16px; color: var(--muted); display: flex; flex-wrap: wrap; gap: 8px 24px; }
.foot a { text-decoration: underline; text-underline-offset: 2px; }

@media (max-width: 1023px) {
  .hero, .pair { grid-template-columns: 1fr; }
  .hero-iso { height: 60vh; }
  .pair .iso-host { height: 320px; }
  .facts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 767px) {
  .bar { padding: 0 16px; gap: 12px; }
  .bar nav .link { padding: 4px 8px; }
  .find > span:not(.icon), .find kbd { display: none; }
  .docs { grid-template-columns: 1fr; }
  .side { position: static; height: auto; max-height: 40vh; border-right: 0; border-bottom: 1px solid var(--line); }
  .detail, .index { padding: 24px 16px 64px; }
  .stage, .show .stage { height: 480px; }
  .hero, .show, .facts { padding: 48px 16px; }
  .foot { padding: 24px 16px; }
}

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