:root {
  --bg: #0a0a0b;
  --bg-alt: #111113;
  --surface: #18181b;
  --border: #27272a;
  --border-light: #3f3f46;
  --text: #fafafa;
  --text-2: #a1a1aa;
  --muted: #71717a;
  --accent: #3b82f6;
  --accent-hi: #60a5fa;
  --accent-soft: rgba(59, 130, 246, 0.12);
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
  --radius: 14px;
  --wrap: 1100px;
  color-scheme: dark;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { background: var(--bg); color: var(--text); font-family: var(--sans); line-height: 1.6; -webkit-font-smoothing: antialiased; overflow-x: hidden; }
a { color: inherit; }
img, video, canvas { display: block; }
.mono { font-family: var(--mono); }
.muted { color: var(--muted); }
.small { font-size: 0.82rem; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }
.wrap.wide { max-width: 1280px; }

/* nav */
.nav { position: sticky; top: 0; z-index: 20; background: rgba(10, 10, 11, 0.78); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 56px; }
.brand { display: flex; align-items: center; gap: 9px; font-weight: 600; text-decoration: none; letter-spacing: -0.01em; }
.nav-links { display: flex; gap: 24px; font-size: 0.9rem; }
.nav-links a { color: var(--text-2); text-decoration: none; transition: color 0.2s; }
.nav-links a:hover { color: var(--text); }

/* hero */
.hero { padding: 88px 0 40px; }
.eyebrow { font-family: var(--mono); font-size: 0.8rem; color: var(--accent-hi); letter-spacing: 0.04em; margin-bottom: 20px; }
h1 { font-size: clamp(2.3rem, 6vw, 4.2rem); line-height: 1.04; letter-spacing: -0.035em; font-weight: 600; }
.lede { max-width: 620px; margin-top: 22px; font-size: 1.12rem; color: var(--text-2); }
.cta { display: flex; flex-wrap: wrap; gap: 12px; margin: 32px 0 48px; }
.btn { display: inline-flex; align-items: center; gap: 10px; height: 44px; padding: 0 20px; border-radius: 10px; font: 500 0.95rem var(--sans); text-decoration: none; cursor: pointer; border: 1px solid transparent; transition: background 0.2s, border-color 0.2s; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hi); }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--border-light); }
.btn-ghost:hover { border-color: var(--muted); }
.copy-hint { font-size: 0.75rem; color: var(--muted); transition: color 0.2s; }
.copy.is-copied { border-color: var(--accent); }
.copy.is-copied .copy-hint { color: var(--accent-hi); }

.hero-stage { position: relative; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); background: var(--bg-alt); user-select: none; -webkit-user-select: none; }
.hero-stage figcaption { position: absolute; left: 0; right: 0; bottom: 0; padding: 40px 18px 14px; font-size: 0.85rem; color: var(--text-2); background: linear-gradient(transparent, rgba(0, 0, 0, 0.6)); pointer-events: none; display: flex; justify-content: space-between; gap: 12px; }
.hover-class { font-family: var(--mono); color: var(--text); }
.tag { position: absolute; top: 14px; font-size: 0.72rem; font-family: var(--mono); padding: 4px 8px; border-radius: 6px; background: rgba(10, 10, 11, 0.6); color: var(--text-2); pointer-events: none; }
.tag-l { left: 14px; }
.tag-r { right: 14px; }
.wipe { position: absolute; top: 0; height: var(--stage-h, 100%); left: 50%; width: 44px; margin-left: -22px; cursor: ew-resize; touch-action: none; display: flex; align-items: center; justify-content: center; }
.wipe::before { content: ''; position: absolute; top: 0; bottom: 0; left: 50%; width: 2px; margin-left: -1px; background: rgba(255, 255, 255, 0.85); }
.wipe-knob { position: relative; width: 36px; height: 36px; border-radius: 50%; background: var(--text); color: var(--bg); display: grid; place-items: center; font-size: 0.9rem; box-shadow: 0 2px 12px rgba(0, 0, 0, 0.4); }
.wipe:focus-visible .wipe-knob { outline: 2px solid var(--accent); outline-offset: 3px; }

/* player */
.stage { position: relative; width: 100%; background: var(--bg-alt) center / cover no-repeat; }
.player-media, .player-canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.player-media { object-fit: fill; opacity: 0; transition: opacity 0.4s; }
.player-canvas { opacity: 0; transition: opacity 0.4s; }
.is-ready .player-canvas { opacity: 1; }
.no-webgl .player-media { opacity: 1; }

/* sections */
.section { padding: 96px 0; border-top: 1px solid var(--border); }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.4rem); letter-spacing: -0.025em; font-weight: 600; line-height: 1.15; }
h3 { font-size: 1.05rem; font-weight: 600; letter-spacing: -0.01em; }
.sub { color: var(--text-2); max-width: 640px; margin-top: 12px; font-size: 1.02rem; }

/* tabs */
.tabs { display: inline-flex; gap: 4px; padding: 4px; margin: 32px 0 20px; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; flex-wrap: wrap; }
.tab { font: 500 0.9rem var(--sans); color: var(--text-2); background: none; border: 0; padding: 8px 16px; border-radius: 8px; cursor: pointer; transition: background 0.2s, color 0.2s; }
.tab:hover { color: var(--text); }
.tab[aria-selected="true"] { background: var(--bg); color: var(--text); box-shadow: inset 0 0 0 1px var(--border-light); }
#task-tabs .tab { display: grid; gap: 1px; text-align: left; padding: 8px 16px 9px; }
.tab-name { font-weight: 500; }
.tab-term { font: 0.7rem var(--mono); color: var(--muted); letter-spacing: 0.01em; }
.tab[aria-selected="true"] .tab-term { color: var(--accent-hi); }
.task-view .stage { border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); }
.task-caption { margin-top: 14px; color: var(--text-2); min-height: 1.6em; }

/* gallery */
.grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-top: 40px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; cursor: pointer; transition: border-color 0.2s, transform 0.2s; text-align: left; color: inherit; font: inherit; padding: 0; }
.card:hover { border-color: var(--border-light); }
.card-body { cursor: auto; user-select: text; -webkit-user-select: text; }
.card:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
/* mouse users get no focus rings (data-input is set in main.js) */
:root[data-input="mouse"] :focus-visible,
:root[data-input="mouse"] .wipe:focus-visible .wipe-knob { outline: none; }
.card.span-2 { grid-column: span 2; }
.card-media { position: relative; overflow: hidden; }
.card-media { aspect-ratio: 16 / 9; background: var(--bg-alt); }
.card-media .stage { position: absolute; inset: 0; }
.card-media .stage.cover { inset: auto; left: 50%; top: 50%; transform: translate(-50%, -50%); }
.card-body { padding: 16px 18px 18px; }
.card-kicker { font-family: var(--mono); font-size: 0.72rem; color: var(--accent-hi); text-transform: uppercase; letter-spacing: 0.06em; }
.card-body h3 { margin-top: 6px; }
.card-body p { margin-top: 4px; color: var(--text-2); font-size: 0.92rem; }

/* stats + chart */
.stats-head { margin-top: 40px; color: var(--muted); }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin: 14px 0 28px; }
.stat-task { display: block; font: 0.72rem var(--mono); color: var(--accent-hi); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 6px; }
.stat-num small { font-size: 1.1rem; font-weight: 500; color: var(--text-2); letter-spacing: 0; }
.stat { padding: 22px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
.stat-num { display: block; font-size: 2.3rem; font-weight: 600; letter-spacing: -0.03em; line-height: 1.1; }
.stat-label { display: block; margin-top: 8px; color: var(--text-2); font-size: 0.86rem; line-height: 1.45; }
.chart-card { padding: 22px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
.chart-head { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; align-items: flex-start; }
.chart-head .muted { font-size: 0.88rem; margin-top: 2px; }
.legend { display: flex; align-items: center; gap: 8px; font-size: 0.82rem; color: var(--text-2); }
.key { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-left: 8px; }
.key-accent { background: var(--accent); }
.key-gray { background: #71717a; }
.chart { position: relative; margin: 16px 0 10px; }
.chart svg { width: 100%; height: auto; overflow: visible; }
.chart text { font-family: var(--sans); }
.tip { position: absolute; pointer-events: none; background: var(--bg); border: 1px solid var(--border-light); border-radius: 8px; padding: 8px 10px; font-size: 0.8rem; white-space: nowrap; transform: translate(-50%, calc(-100% - 12px)); opacity: 0; transition: opacity 0.12s; }
.tip b { font-weight: 600; }

/* collapsed boxes: "All the numbers" and "Questions" (content written by tools/prerender.mjs) */
.fold { margin-top: 20px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
.fold > summary { cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: baseline; gap: 16px; padding: 16px 22px; font-weight: 500; }
.fold > summary::-webkit-details-marker { display: none; }
.fold > summary::after { content: '+'; flex: none; font: 400 1.2rem/1 var(--mono); color: var(--muted); transition: color 0.2s; }
.fold[open] > summary::after { content: '−'; }
.fold > summary:hover::after { color: var(--text); }
.fold > summary .muted { font-weight: 400; }
.fold-body { padding: 6px 22px 24px; display: grid; gap: 36px; }
.fold a { color: var(--text); text-decoration: none; border-bottom: 1px solid var(--border-light); }
.fold a:hover { border-color: var(--text-2); }
#next .fold { margin-top: 48px; }

/* tables */
.result h3 { margin-bottom: 10px; }
.table-scroll { overflow-x: auto; }
.result table { width: 100%; border-collapse: collapse; font-size: 0.86rem; font-variant-numeric: tabular-nums; }
.result th, .result td { padding: 7px 12px; border-bottom: 1px solid var(--border); text-align: right; white-space: nowrap; }
.result th:first-child { text-align: left; padding-left: 0; }
.result thead th { font-weight: 500; font-size: 0.76rem; color: var(--muted); }
.result tbody th { font-weight: 400; color: var(--text-2); }
.result td { color: var(--text-2); }
.result tr.ours th, .result tr.ours td { color: var(--text); }
.result tr.ours th { color: var(--accent-hi); font-weight: 500; }
.result .note { margin-top: 10px; max-width: 820px; }
.result ul { padding-left: 18px; display: grid; gap: 8px; color: var(--text-2); font-size: 0.88rem; }
.result ul strong { color: var(--text); font-weight: 500; }

/* questions: a flat list inside the fold */
.faq .fold-body { gap: 22px; max-width: 860px; }
.qa h3 { font-size: 0.98rem; }
.qa p { margin-top: 4px; color: var(--text-2); font-size: 0.92rem; }
.qa code { font: 0.86em var(--mono); color: var(--text); background: var(--bg); border: 1px solid var(--border); border-radius: 5px; padding: 1px 5px; }

/* roadmap */
.two-col { display: grid; grid-template-columns: 1.1fr 1fr; gap: 56px; align-items: start; }
.roadmap-head { color: var(--muted); margin-bottom: 4px; }
.roadmap { list-style: none; display: grid; gap: 4px; }
.roadmap li { display: flex; gap: 14px; padding: 14px 0; border-bottom: 1px solid var(--border); }
.roadmap li:last-child { border-bottom: 0; }
.roadmap .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); margin-top: 9px; flex: none; }
.roadmap strong { display: block; font-weight: 500; }
.roadmap .muted { font-size: 0.9rem; }

/* footer */
.footer { border-top: 1px solid var(--border); padding: 40px 0 56px; color: var(--text-2); font-size: 0.92rem; }
.footer-inner { display: flex; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.footer a { color: var(--text); text-decoration: none; border-bottom: 1px solid var(--border-light); }
.credits { max-width: 520px; }
.credits summary { cursor: pointer; color: var(--text-2); }
.credits ul { margin-top: 12px; padding-left: 18px; font-size: 0.8rem; color: var(--muted); display: grid; gap: 6px; }
.credits a { color: var(--text-2); }

/* lightbox */
.lightbox { border: 0; padding: 0; background: transparent; max-width: none; max-height: none; width: 100vw; height: 100vh; margin: 0; color: var(--text); }
.lightbox::backdrop { background: rgba(5, 5, 6, 0.88); backdrop-filter: blur(6px); }
.lb-inner { position: relative; display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 24px; width: min(1500px, 100%); height: 100%; margin: 0 auto; padding: 48px 32px; align-items: center; }
.lb-stage { position: relative; min-width: 0; display: flex; align-items: center; justify-content: center; max-height: 100%; }
.lb-stage .stage { border-radius: 10px; overflow: hidden; max-height: calc(100vh - 96px); width: auto; max-width: 100%; }
.lb-side { align-self: center; display: grid; gap: 14px; max-height: calc(100vh - 96px); overflow: auto; }
.lb-meta { color: var(--text-2); }
.lb-stage .stage:focus { outline: none; }
:root[data-input="keyboard"] .lb-stage .stage:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.lb-paused { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); width: 64px; height: 64px; border-radius: 50%; background: rgba(10, 10, 11, 0.6); color: #fff; display: grid; place-items: center; padding-left: 4px; font-size: 1.5rem; pointer-events: none; }
.lb-paused[hidden] { display: none; }
.lb-close { position: absolute; top: 12px; right: 18px; width: 40px; height: 40px; border-radius: 50%; border: 1px solid var(--border-light); background: var(--surface); color: var(--text); font-size: 1.3rem; cursor: pointer; }
.ctrl { display: grid; gap: 6px; font-size: 0.85rem; color: var(--text-2); }
.ctrl-check { display: flex; align-items: center; gap: 8px; }
input[type="range"] { accent-color: var(--accent); width: 100%; }
input[type="checkbox"] { accent-color: var(--accent); }
.legend-list { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { display: inline-flex; align-items: center; gap: 6px; padding: 4px 9px; font: 0.76rem var(--sans); color: var(--text-2); background: var(--bg); border: 1px solid var(--border); border-radius: 999px; cursor: pointer; }
.chip i { width: 9px; height: 9px; border-radius: 3px; flex: none; }
.chip.off { opacity: 0.35; }
.chip:hover { border-color: var(--border-light); color: var(--text); }

@media (max-width: 860px) {
  .grid { grid-template-columns: 1fr; }
  .card.span-2 { grid-column: auto; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .two-col { grid-template-columns: 1fr; gap: 28px; }
  .lb-inner { grid-template-columns: 1fr; align-content: start; padding: 64px 16px 24px; overflow: auto; }
  .lb-stage .stage { max-height: none; }
  .lb-side { max-height: none; }
}
@media (max-width: 600px) {
  .wrap { padding: 0 16px; }
  .nav-links a:not(:last-child) { display: none; }
  .hero { padding-top: 56px; }
  .section { padding: 64px 0; }
  .tag { display: none; }
  .hero-stage figcaption { position: static; background: var(--bg-alt); padding: 10px 14px 12px; font-size: 0.8rem; }
  .hover-class { display: none; }
  .fold > summary { padding: 14px 16px; }
  .fold > summary .muted { display: none; }
  .fold-body { padding: 4px 16px 20px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

.tabs-sm { margin: 0; }
.tabs-sm:empty { display: none; }
.tabs-sm .tab { padding: 5px 12px; font-size: 0.82rem; }