:root {
  --bg: #0b1020;
  --bg-2: #111832;
  --surface: #151d3a;
  --surface-2: #1c2648;
  --border: rgba(148, 163, 255, 0.16);
  --text: #e8ecff;
  --muted: #9aa3c7;
  --accent: #8b7bff;
  --accent-2: #38bdf8;
  --sponsor: #ffdd00;
  --sponsor-text: #1a1400;
  --danger: #ff7a90;
  --ok: #5eead4;
  --radius: 14px;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;
  color-scheme: dark;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f7f8fc;
    --bg-2: #eef0fa;
    --surface: #ffffff;
    --surface-2: #f2f4fb;
    --border: rgba(30, 41, 99, 0.14);
    --text: #141a33;
    --muted: #5a6386;
    --accent: #6d5cf5;
    --accent-2: #0284c7;
    --danger: #c42a4a;
    --ok: #0f766e;
    color-scheme: light;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: radial-gradient(1200px 600px at 80% -10%, color-mix(in srgb, var(--accent) 22%, transparent), transparent 60%),
    radial-gradient(900px 500px at -10% 10%, color-mix(in srgb, var(--accent-2) 14%, transparent), transparent 60%), var(--bg);
  color: var(--text);
  font: 16px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent-2); }
code, pre, .mono, textarea { font-family: var(--mono); font-variant-ligatures: none; }
code { font-size: 0.92em; }
p code, li code { background: var(--surface-2); padding: 0.1em 0.35em; border-radius: 6px; }
.muted { color: var(--muted); }
.wrap { width: min(1180px, 100% - 32px); margin-inline: auto; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 16px; z-index: 10; background: var(--surface); padding: 8px 12px; border-radius: 8px; }

/* nav */
.nav { position: sticky; top: 0; z-index: 5; backdrop-filter: blur(12px); background: color-mix(in srgb, var(--bg) 78%, transparent); border-bottom: 1px solid var(--border); }
.nav-inner { display: flex; align-items: center; gap: 24px; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: 18px; color: var(--text); text-decoration: none; }
.nav-links { display: flex; gap: 20px; margin-left: auto; }
.nav-links a { color: var(--muted); text-decoration: none; font-size: 15px; }
.nav-links a:hover { color: var(--text); }

/* buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border-radius: 10px; border: 1px solid transparent; padding: 11px 18px; font: 600 15px var(--sans); text-decoration: none; cursor: pointer; transition: transform 0.15s, background 0.15s, border-color 0.15s; white-space: nowrap; }
.btn:hover { transform: translateY(-1px); }
.btn:focus-visible, select:focus-visible, input:focus-visible, textarea:focus-visible { outline: 2px solid var(--accent-2); outline-offset: 2px; }
.btn-sm { padding: 7px 12px; font-size: 14px; }
.btn-xl { padding: 16px 30px; font-size: 19px; border-radius: 14px; }
.btn-primary { background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #fff; }
.btn-ghost { background: var(--surface); color: var(--text); border-color: var(--border); }
.btn-ghost:hover { border-color: color-mix(in srgb, var(--accent) 60%, transparent); }
.btn-sponsor { background: var(--sponsor); color: var(--sponsor-text); box-shadow: 0 6px 24px rgba(255, 221, 0, 0.25); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }

/* hero */
.hero { text-align: center; padding: 72px 0 32px; }
.eyebrow { display: inline-block; margin: 0 0 16px; padding: 4px 12px; border: 1px solid var(--border); border-radius: 999px; color: var(--muted); font-size: 14px; }
h1 { font-size: clamp(36px, 6vw, 64px); line-height: 1.08; letter-spacing: -0.02em; margin: 0 auto 18px; max-width: 14ch; text-wrap: balance; }
.grad { background: linear-gradient(135deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lede { color: var(--muted); font-size: clamp(17px, 2vw, 20px); max-width: 62ch; margin: 0 auto 28px; text-wrap: pretty; }
.install { display: inline-flex; align-items: center; gap: 10px; max-width: 100%; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 8px 8px 8px 16px; margin-bottom: 24px; }
.install code { overflow-x: auto; white-space: nowrap; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }

/* sections */
.section { padding: 56px 0; }
.section-head { margin-bottom: 24px; }
.section-head h2, .sponsor h2 { font-size: clamp(26px, 3.4vw, 36px); margin: 0 0 8px; letter-spacing: -0.01em; }
.section-head p { color: var(--muted); margin: 0; max-width: 70ch; }

/* playground */
.pg { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 20px; align-items: start; }
.pg-preview, .pg-editor { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; }
.pg-preview { position: sticky; top: 76px; }
.stage { position: relative; width: 100%; height: 320px; overflow: hidden; border-radius: 10px; background: var(--bg-2); }
.scene { position: absolute; top: 0; border: 0; transform-origin: 0 0; pointer-events: none; }
.probe { position: absolute; width: 10px; height: 10px; left: -9999px; border: 0; visibility: hidden; }
.player { display: flex; align-items: center; gap: 10px; margin-top: 12px; }
.player input[type="range"] { flex: 1; min-width: 0; accent-color: var(--accent); }
#time { font-size: 13px; min-width: 9ch; text-align: right; }
.status { margin: 8px 0 0; font-size: 13px; color: var(--muted); min-height: 1.6em; }
.status[data-state="error"] { color: var(--danger); }
.export { margin-top: 12px; padding-top: 14px; border-top: 1px solid var(--border); display: grid; gap: 10px; }
.export-row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.export-row code { flex: 1; min-width: 0; background: var(--bg-2); padding: 8px 12px; border-radius: 8px; font-size: 14px; overflow-x: auto; white-space: nowrap; }
.hint { margin: 0; font-size: 13px; color: var(--muted); }

.controls { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px 14px; margin-bottom: 16px; }
.controls label { display: grid; gap: 4px; font-size: 13px; color: var(--muted); }
.controls label span { justify-self: end; margin-top: -1.6em; }
select, input[type="text"], textarea { width: 100%; background: var(--bg-2); color: var(--text); border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; font: 14px var(--sans); }
input[type="range"] { width: 100%; accent-color: var(--accent); }
.toggles { grid-column: 1 / -1; display: flex; flex-wrap: wrap; gap: 8px 18px; }
.controls .check { display: flex; align-items: center; gap: 8px; color: var(--text); font-size: 14px; }
.check input { width: 16px; height: 16px; accent-color: var(--accent); }
.steps { display: grid; gap: 12px; }
.step { border: 1px solid var(--border); border-radius: 10px; padding: 10px; background: var(--bg-2); }
.step-head { display: flex; gap: 8px; align-items: center; margin-bottom: 8px; }
.step-num { font: 600 13px var(--sans); color: var(--accent); white-space: nowrap; }
.step-caption { flex: 1; padding: 6px 8px; font-size: 13px; }
.icon-btn { background: none; border: 1px solid var(--border); color: var(--muted); border-radius: 6px; width: 28px; height: 28px; cursor: pointer; }
.icon-btn:disabled { opacity: 0.3; cursor: not-allowed; }
.step-code { font: 13px/1.55 var(--mono); resize: vertical; tab-size: 2; white-space: pre; overflow-x: auto; }
.add-step { margin-top: 12px; width: 100%; }

/* features */
.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }

/* usage */
.usage { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.usage-block { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; min-width: 0; }
.usage-block.wide { grid-column: 1 / -1; }
.usage-block h3 { margin: 0 0 10px; font-size: 16px; }
.usage-block p { margin: 10px 0 0; font-size: 14px; }
pre { margin: 0; background: var(--bg-2); border-radius: 10px; padding: 14px 16px; overflow-x: auto; font-size: 14px; line-height: 1.6; }
.more { margin-top: 18px; }

/* gallery */
.gallery { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; align-items: start; }
.gallery figure { margin: 0; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.gallery .tall { grid-row: span 2; }
.gallery video { display: block; width: 100%; background: #000; }
.gallery figcaption { padding: 10px 14px; font-size: 14px; color: var(--muted); }

/* sponsor */
.sponsor { text-align: center; margin: 32px auto 56px; padding: 56px 24px; border-radius: 24px; border: 1px solid color-mix(in srgb, var(--sponsor) 40%, transparent);
  background: radial-gradient(600px 240px at 50% 0%, color-mix(in srgb, var(--sponsor) 18%, transparent), transparent 70%), var(--surface); }
.sponsor > p { color: var(--muted); max-width: 60ch; margin: 0 auto 26px; }
.tiers { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; margin-top: 32px; text-align: left; }
.tier { background: var(--bg-2); border: 1px solid var(--border); border-radius: 12px; padding: 14px; }
.tier strong { display: block; }
.tier span { color: var(--accent-2); font-size: 14px; font-weight: 600; }
.tier p { margin: 6px 0 0; color: var(--muted); font-size: 14px; }

/* footer */
.footer { border-top: 1px solid var(--border); padding: 24px 0; color: var(--muted); font-size: 14px; }
.footer-inner { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }

@media (max-width: 980px) {
  .pg { grid-template-columns: 1fr; }
  .pg-preview { position: static; }
  .grid, .gallery { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .tiers { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .nav-links { display: none; }
  .nav-inner { justify-content: space-between; }
  .grid, .gallery, .usage, .controls { grid-template-columns: 1fr; }
  .gallery .tall { grid-row: auto; }
  .tiers { grid-template-columns: 1fr; }
  .hero { padding-top: 48px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn { transition: none; }
}