:root {
  --ink: #17100f; --ink2: #221816; --paper: #f4e6cc; --paper2: #d9c6a6; --muted: #b8a58a;
  --gold: #f0b44a; --rose: #d98c7a; --line: rgba(244, 230, 204, .16);
  --serif: Georgia, "Iowan Old Style", "Times New Roman", serif;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --exploration-footer-bg: #120c0b; --exploration-footer-ink: #f4e6cc; --exploration-footer-border: rgba(244, 230, 204, .18);
  color-scheme: dark;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--ink); color: var(--paper); font: 17px/1.6 var(--sans); -webkit-font-smoothing: antialiased; }
img, video { display: block; max-width: 100%; height: auto; }
a { color: var(--gold); }
.skip { position: absolute; left: -999px; top: 8px; background: var(--paper); color: var(--ink); padding: 8px 14px; border-radius: 8px; z-index: 50; }
.skip:focus { left: 12px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
:focus-visible { outline: 3px solid var(--gold); outline-offset: 3px; }

.masthead { position: sticky; top: 0; z-index: 20; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 14px clamp(16px, 4vw, 48px);
  background: rgba(23, 16, 15, .86); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.wordmark { color: var(--paper); text-decoration: none; font: 700 14px/1 var(--sans); letter-spacing: .14em; white-space: nowrap; padding-block: 6px; }
.wordmark span { color: var(--muted); font-weight: 500; }
.masthead nav { display: flex; align-items: center; gap: clamp(10px, 2vw, 26px); flex-wrap: wrap; justify-content: flex-end; }
.masthead nav a { color: var(--paper2); text-decoration: none; font-size: 15px; }
.masthead nav a:hover { color: var(--paper); }
.masthead nav .create-yours { color: var(--ink); background: var(--gold); padding: 8px 16px; border-radius: 999px; font-weight: 600; }

.hero { position: relative; min-height: min(92vh, 900px); display: grid; align-items: end; overflow: hidden; }
.hero-image { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: 55% 45%; }
.hero::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(23,16,15,.86) 0%, rgba(23,16,15,.35) 48%, rgba(23,16,15,0) 70%), linear-gradient(0deg, rgba(23,16,15,.9) 0%, rgba(23,16,15,0) 34%); }
.hero-copy { position: relative; z-index: 1; padding: 0 clamp(16px, 5vw, 72px) clamp(90px, 12vh, 140px); max-width: 720px; }
.hero h1 { font: 400 clamp(64px, 11vw, 150px)/.9 var(--serif); margin: 10px 0 18px; letter-spacing: -.02em; }
.hero h1 em, h2 em { color: var(--gold); }
.hero-copy > p:not(.eyebrow) { font-size: clamp(18px, 2vw, 22px); color: var(--paper2); margin: 0 0 26px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-foot { position: absolute; left: 0; right: 0; bottom: 0; z-index: 1; display: flex; justify-content: space-between; gap: 12px; padding: 16px clamp(16px, 5vw, 72px); font: 600 12px/1.3 var(--sans); letter-spacing: .16em; color: var(--muted); border-top: 1px solid var(--line); flex-wrap: wrap; }
.eyebrow { font: 600 12px/1.3 var(--sans); letter-spacing: .2em; color: var(--gold); margin: 0; text-transform: uppercase; }

.button { display: inline-flex; align-items: center; gap: 10px; padding: 13px 22px; border-radius: 999px; text-decoration: none; font-weight: 600; font-size: 16px; min-height: 44px; }
.button.light { background: var(--paper); color: var(--ink); }
.button.light:hover { background: #fff5e2; }
.button.ghost { color: var(--paper); border: 1px solid rgba(244, 230, 204, .45); }
.button.ghost:hover { border-color: var(--paper); }

.section { padding: clamp(64px, 9vw, 120px) clamp(16px, 5vw, 72px); border-top: 1px solid var(--line); }
.section-heading { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: clamp(20px, 5vw, 80px); align-items: end; margin-bottom: clamp(28px, 4vw, 48px); }
.section-heading h2 { font: 400 clamp(38px, 5.4vw, 72px)/1.02 var(--serif); margin: 12px 0 0; }
.section-heading > p { color: var(--paper2); margin: 0; max-width: 560px; }
h3 { font: 400 clamp(24px, 2.4vw, 32px)/1.15 var(--serif); margin: 8px 0 10px; }

#film-player, #howto-player { width: 100%; aspect-ratio: 16 / 9; background: #000; border-radius: 18px; border: 1px solid var(--line); }
.chapter-list { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 10px; margin-top: 16px; }
.chapter-list button { text-align: left; background: var(--ink2); color: var(--paper2); border: 1px solid var(--line); border-radius: 14px; padding: 12px 14px; font: 600 13px/1.35 var(--sans); cursor: pointer; min-height: 44px; }
.chapter-list button span { display: block; color: var(--paper); font: 400 18px/1.2 var(--serif); margin: 2px 0; }
.chapter-list button small { color: var(--muted); font-weight: 500; }
.chapter-list button[aria-current="true"] { border-color: var(--gold); background: #2c1f17; }
.micro { color: var(--muted); font-size: 14px; margin: 14px 0 0; }

.howto { display: grid; grid-template-columns: minmax(0, 1.7fr) minmax(280px, 1fr); gap: clamp(20px, 3vw, 44px); align-items: start; }
.howto-side p:not(.eyebrow) { color: var(--paper2); }
.stack-links { display: flex; gap: 10px; flex-wrap: wrap; margin: 18px 0 26px; }
.numbers { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; margin: 0; }
.numbers div { border: 1px solid var(--line); border-radius: 14px; padding: 12px; background: var(--ink2); }
.numbers dt { font: 400 clamp(24px, 2.6vw, 34px)/1 var(--serif); color: var(--gold); }
.numbers dd { margin: 6px 0 0; color: var(--muted); font-size: 13px; }

.steps { list-style: none; margin: clamp(40px, 6vw, 72px) 0 0; padding: 0; display: grid; gap: clamp(28px, 4vw, 48px); }
.step { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: clamp(20px, 4vw, 56px); align-items: center; }
.step img { border-radius: 16px; border: 1px solid var(--line); width: 100%; }
.step span, figcaption span, .card span { font: 600 12px/1.3 var(--sans); letter-spacing: .18em; color: var(--gold); }
.step p { color: var(--paper2); margin: 0; }
.trio { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }

.comparison { position: relative; overflow: hidden; border-radius: 18px; border: 1px solid var(--line); aspect-ratio: 16 / 9; background: #000; touch-action: pan-y; }
.comparison > img, .comparison .before img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.comparison .before { position: absolute; inset: 0; clip-path: inset(0 calc(100% - var(--reveal)) 0 0); }
.compare-label { position: absolute; top: 14px; z-index: 2; font: 600 12px/1 var(--sans); letter-spacing: .16em; background: rgba(23,16,15,.72); padding: 8px 12px; border-radius: 999px; }
.compare-label.left { left: 14px; } .compare-label.right { right: 14px; }
#compare-line { position: absolute; top: 0; bottom: 0; left: var(--reveal); width: 44px; margin-left: -22px; background: none; border: 0; cursor: ew-resize; z-index: 3; padding: 0; }
#compare-line::before { content: ""; position: absolute; left: 21px; top: 0; bottom: 0; width: 2px; background: var(--paper); }
#compare-line span { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); width: 46px; height: 46px; border-radius: 50%; background: var(--paper); display: grid; place-items: center; box-shadow: 0 6px 20px rgba(0,0,0,.4); }
#compare-line svg { width: 26px; stroke: var(--ink); stroke-width: 2.4; fill: none; }
.comparison-control { display: flex; justify-content: space-between; gap: 16px; align-items: center; margin-top: 14px; flex-wrap: wrap; color: var(--muted); font-size: 14px; }
.comparison-control p { margin: 0; } .comparison-control p span { color: var(--muted); opacity: .8; }
.comparison-fine { display: flex; gap: 12px; align-items: center; }
.comparison-fine input { accent-color: var(--gold); width: min(220px, 40vw); min-height: 44px; }
.comparison-fine button { background: none; color: var(--paper2); border: 1px solid var(--line); border-radius: 999px; padding: 8px 14px; min-height: 44px; cursor: pointer; }

.pairs { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: clamp(16px, 3vw, 32px); margin-top: clamp(28px, 4vw, 48px); }
figure { margin: 0; }
.pair { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.pair img, .fix img, .pair-grid img, .strip img { border-radius: 12px; border: 1px solid var(--line); width: 100%; }
figcaption { color: var(--paper2); font-size: 15px; margin-top: 10px; }
figcaption span { display: block; margin-bottom: 2px; }
.fix { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1fr) minmax(0, 1fr); gap: clamp(16px, 3vw, 32px); align-items: center; margin-top: clamp(40px, 6vw, 72px); padding-top: clamp(28px, 4vw, 48px); border-top: 1px dashed var(--line); }
.fix p:not(.eyebrow) { color: var(--paper2); margin: 0; }

.pair-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(16px, 2.5vw, 28px); }
.pair-grid img + img { margin-top: 6px; }
.strip { margin-top: clamp(28px, 4vw, 48px); }
.sound { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr); gap: clamp(20px, 4vw, 56px); margin-top: clamp(40px, 6vw, 72px); padding-top: clamp(28px, 4vw, 48px); border-top: 1px dashed var(--line); align-items: end; }
.sound > p { color: var(--paper2); margin: 0; }

.cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(14px, 2vw, 24px); }
.card { display: flex; flex-direction: column; gap: 4px; padding: 24px; border-radius: 18px; background: var(--ink2); border: 1px solid var(--line); color: var(--paper); text-decoration: none; min-height: 100%; }
.card:hover { border-color: rgba(240, 180, 74, .6); }
.card h3 { word-break: break-word; }
.card p { color: var(--paper2); margin: 0 0 16px; flex: 1; }
.card b { color: var(--gold); font-weight: 600; }
.cta { display: flex; align-items: center; justify-content: space-between; gap: 18px; margin-top: clamp(28px, 4vw, 48px); padding: 26px; border-radius: 18px; background: linear-gradient(120deg, #3a2517, #22161a); border: 1px solid var(--line); flex-wrap: wrap; }
.cta p { font: 400 clamp(20px, 2.2vw, 28px)/1.25 var(--serif); margin: 0; }

.film-modal { width: min(1280px, calc(100vw - 32px)); max-width: none; max-height: calc(100vh - 32px); padding: 0; border: 1px solid var(--line); border-radius: 20px; background: var(--ink); color: var(--paper); }
.film-modal::backdrop { background: rgba(10, 6, 6, .86); backdrop-filter: blur(4px); }
.film-modal-inner { padding: 14px 14px 16px; }
.film-modal video { width: 100%; max-height: calc(100vh - 140px); aspect-ratio: 16 / 9; background: #000; border-radius: 12px; }
.film-modal-close { display: flex; margin: 0 0 10px auto; align-items: center; gap: 8px; min-height: 44px; padding: 8px 16px; border-radius: 999px; border: 1px solid rgba(244, 230, 204, .45); background: none; color: var(--paper); font: 600 15px/1 var(--sans); cursor: pointer; }
.film-modal-close:hover { border-color: var(--paper); }
.film-modal .micro { margin: 10px 2px 0; }
.site-foot { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 14px 24px; padding: 28px clamp(16px, 5vw, 72px); border-top: 1px solid var(--line); color: var(--muted); font: 600 12px/1.4 var(--sans); letter-spacing: .14em; }
.site-foot .foot-pdf { color: var(--gold); letter-spacing: .04em; font-size: 14px; padding-block: 4px; }
.site-foot [data-exploration-controls] { flex: 1 1 320px; display: flex; justify-content: flex-end; }

@media (max-width: 900px) {
  .hero-image { object-position: 36% 40%; }
  .section-heading, .howto, .step, .sound { grid-template-columns: 1fr; }
  .chapter-list { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .pairs, .pair-grid, .cards, .fix { grid-template-columns: 1fr; }
  .masthead nav a:not(.create-yours) { display: none; }
}
@media (max-width: 480px) {
  body { font-size: 16px; }
  .wordmark span { display: none; }
  .masthead nav .create-yours { padding: 8px 12px; font-size: 14px; white-space: nowrap; }
  .chapter-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .numbers { grid-template-columns: 1fr 1fr 1fr; }
  .trio { grid-template-columns: 1fr; }
  .hero { min-height: 640px; }
  .comparison-fine input { width: 120px; }
}
@media (max-height: 460px) and (orientation: landscape) {
  .hero { min-height: 420px; }
  .hero h1 { font-size: 56px; }
  .hero-copy { padding-bottom: 70px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }