:root {
  --canvas: #faf9f5;
  --ink: #141413;
  --body: #3d3d3a;
  --muted: #6c6a64;
  --hairline: #e6dfd8;
  --card: #efe9de;
  --coral: #cc785c;
  --coral-active: #a9583e;
  --dark: #181715;
  --dark-elevated: #252320;
  --teal: #5db8a6;
  --sans: Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --display: 'Cormorant Garamond', Georgia, serif;
  --mono: 'JetBrains Mono', ui-monospace, Consolas, monospace;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--canvas); font: 16px/1.6 var(--sans); }
a { color: inherit; }
button, input { font: inherit; }
.wrap { width: min(1180px, calc(100% - 40px)); margin-inline: auto; }
.site-header { border-bottom: 1px solid var(--hairline); }
.site-header .wrap { min-height: 64px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand { font-size: 14px; font-weight: 600; text-decoration: none; white-space: nowrap; }
.header-link { color: var(--muted); font-size: 14px; text-decoration: none; }
.eyebrow { margin: 0 0 12px; color: var(--coral); font: 500 12px/1.4 var(--sans); letter-spacing: 1.5px; text-transform: uppercase; }
h1, h2, h3 { font-family: var(--display); font-weight: 400; letter-spacing: -0.035em; }
h1 { margin: 0; font-size: clamp(42px, 5.5vw, 68px); line-height: 1.03; }
h2 { margin: 0; font-size: clamp(30px, 3vw, 42px); line-height: 1.12; }
h3 { margin: 0; font-size: 27px; line-height: 1.15; }
.lead { max-width: 680px; margin: 20px 0 0; color: var(--body); font-size: 17px; }
.hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 0.88fr); align-items: center; gap: 48px; padding-block: 80px 92px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.button { min-height: 40px; display: inline-flex; align-items: center; justify-content: center; padding: 10px 20px; border: 1px solid transparent; border-radius: 8px; background: var(--coral); color: #fff; font: 500 14px/1.2 var(--sans); text-decoration: none; cursor: pointer; }
.button:active { background: var(--coral-active); }
.button.secondary { border-color: var(--hairline); background: var(--canvas); color: var(--ink); }
.signal-card { padding: 24px; border-radius: 16px; background: var(--dark); color: var(--canvas); }
.signal-title { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin: 0 0 20px; color: #a09d96; font: 12px/1.4 var(--mono); }
.signal-dot { display: inline-block; width: 8px; height: 8px; margin-right: 8px; border-radius: 50%; background: var(--teal); }
.signal-flow { display: grid; gap: 8px; }
.signal-step { padding: 14px 16px; border-radius: 8px; background: var(--dark-elevated); font: 14px/1.4 var(--mono); }
.signal-step span { color: #e8a55a; }
.signal-caption { margin: 20px 0 0; color: #a09d96; font-size: 13px; }
.section-band { padding-block: 72px 82px; background: #f5f0e8; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 28px; }
.section-heading p { max-width: 480px; margin: 0; color: var(--muted); }
.chapter-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
.chapter-card { min-height: 192px; display: flex; flex-direction: column; padding: 22px; border-radius: 12px; background: var(--card); }
.chapter-card[href] { text-decoration: none; }
.chapter-card[href]:focus-visible { outline: 3px solid rgba(204, 120, 92, 0.4); outline-offset: 3px; }
.chapter-number { color: var(--coral); font: 12px/1.4 var(--mono); }
.chapter-card h3 { margin: 23px 0 8px; font-size: 24px; }
.chapter-meta { margin: auto 0 0; color: var(--muted); font-size: 13px; }
.practice-band { padding-block: 70px 90px; }
.chapter-page { padding-block: 60px 86px; }
.chapter-page .lead { margin-bottom: 34px; }
.exercise-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.exercise-card { display: flex; flex-direction: column; min-height: 170px; padding: 24px; border-radius: 12px; background: var(--card); text-decoration: none; }
.exercise-card h2 { margin: 18px 0 8px; font-size: 28px; }
.exercise-card p { margin: 0; color: var(--body); font-size: 14px; }
.exercise-card .chapter-meta { margin-top: auto; padding-top: 18px; }
.practice-grid { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr); gap: 20px; margin-top: 24px; }
.practice-card { padding: 32px; border-radius: 12px; background: var(--card); }
.practice-card.dark { background: var(--dark); color: var(--canvas); }
.practice-card h3 { margin-bottom: 14px; }
.practice-card p { margin: 0 0 18px; color: var(--body); }
.practice-card.dark p { color: #a09d96; }
.practice-card code, .inline-code { font: 13px/1.5 var(--mono); }
.site-footer { padding-block: 36px; background: var(--dark); color: #a09d96; font-size: 13px; }
.site-footer .wrap { display: flex; justify-content: space-between; gap: 16px; }
.demo-page { padding-block: 56px 88px; }
.demo-layout { display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(270px, 0.8fr); gap: 20px; align-items: start; margin-top: 32px; }
.stage-card { overflow: hidden; border-radius: 16px; background: var(--dark); }
#stage { height: min(56vw, 500px); min-height: 340px; position: relative; }
#stage { touch-action: none; }
#stage.square-stage { width: min(100%, 560px); aspect-ratio: 1; height: auto; min-height: 0; margin-inline: auto; }
#stage canvas { display: block; width: 100%; height: 100%; }
.stage-footer { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; padding: 12px 18px; color: #a09d96; background: var(--dark-elevated); font: 12px/1.5 var(--mono); }
.panel { padding: 24px; border-radius: 12px; background: var(--card); }
.panel h2 { margin-bottom: 20px; font-size: 30px; }
.control { display: grid; gap: 9px; margin-bottom: 18px; color: var(--body); font-size: 14px; }
.checkbox-control { display: flex; align-items: center; gap: 10px; }
.checkbox-control input { margin: 0; accent-color: var(--coral); }
input[type='range'] { width: 100%; accent-color: var(--coral); }
.control select { width: 100%; min-height: 40px; padding: 8px 12px; border: 1px solid var(--hairline); border-radius: 8px; background: var(--canvas); color: var(--ink); cursor: pointer; }
.readout { display: block; min-height: 150px; padding: 16px; border-radius: 8px; background: var(--dark); color: var(--canvas); font: 13px/1.7 var(--mono); white-space: pre-line; overflow-wrap: anywhere; }
.learning-card { max-width: 800px; margin-top: 48px; }
.learning-card h2 { font-size: 34px; }
.learning-card p, .learning-card li { color: var(--body); }
.learning-card ol { padding-left: 24px; }
.learning-card li { margin: 9px 0; }
button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible { outline: 3px solid rgba(204, 120, 92, 0.4); outline-offset: 3px; }
@media (max-width: 1000px) { .chapter-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 800px) { .hero, .practice-grid, .demo-layout, .exercise-grid { grid-template-columns: 1fr; } .hero { gap: 32px; padding-block: 55px 65px; } .section-heading { display: block; } .section-heading p { margin-top: 12px; } #stage { height: 55vh; min-height: 310px; } }
@media (max-width: 560px) { .wrap { width: min(100% - 32px, 1180px); } .chapter-grid { grid-template-columns: 1fr; } .chapter-card { min-height: 145px; } .chapter-card h3 { margin-top: 14px; } .section-band, .practice-band { padding-block: 56px; } .signal-card, .practice-card, .panel { padding: 20px; } .site-footer .wrap { flex-direction: column; } }