:root {
  --ink: #10171b;
  --ink-2: #182228;
  --bone: #edf0ed;
  --paper: #dfe4e1;
  --muted: #92a0a5;
  --line: rgba(213, 225, 226, 0.18);
  --cyan: #8dc7cf;
  --cyan-dim: #507f88;
  --gold: #d8b36e;
  --warm: #9b7550;
  --danger: #b94c4c;
  --display: "Avenir Next Condensed", "Arial Narrow", "Helvetica Neue", sans-serif;
  --body: "Avenir Next", "Helvetica Neue", Arial, sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--ink); }
body { margin: 0; color: var(--bone); background: var(--ink); font-family: var(--body); -webkit-font-smoothing: antialiased; }
button, input, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: inherit; }
img { display: block; width: 100%; }

.glass-seam { position: fixed; z-index: 20; inset: 0 auto 0 50%; width: 1px; pointer-events: none; background: linear-gradient(transparent 3%, rgba(185,230,237,.52) 16%, rgba(255,255,255,.1) 84%, transparent 97%); box-shadow: 0 0 34px rgba(141,199,207,.12); }
.site-header { position: sticky; z-index: 30; top: 0; min-height: 64px; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; padding: 0 3vw; background: rgba(16,23,27,.88); border-bottom: 1px solid var(--line); backdrop-filter: blur(16px); }
.wordmark { display: flex; align-items: center; gap: 12px; text-decoration: none; font: 700 16px/1 var(--display); letter-spacing: .08em; }
.wordmark i { width: 24px; height: 1px; background: var(--cyan); }
.wordmark small { color: var(--muted); font: 600 10px/1 var(--mono); letter-spacing: .15em; }
.site-header nav { display: flex; gap: 28px; }
.site-header nav a { color: #bdc6c6; font-size: 12px; text-decoration: none; letter-spacing: .09em; text-transform: uppercase; }
.site-header nav a:hover { color: white; }
.live-pill { justify-self: end; color: var(--cyan); font: 600 10px/1 var(--mono); letter-spacing: .12em; }
.live-pill span { display: inline-block; width: 6px; height: 6px; margin-right: 7px; border-radius: 50%; background: var(--gold); box-shadow: 0 0 12px var(--gold); }

.hero { min-height: calc(100vh - 64px); display: grid; grid-template-columns: 46% 54%; grid-template-rows: 1fr auto; overflow: hidden; background: radial-gradient(circle at 74% 38%, rgba(82,130,138,.23), transparent 29%), linear-gradient(90deg, rgba(134,99,56,.11), transparent 47%, rgba(52,95,105,.12)); }
.hero-copy { align-self: center; padding: 9vw 5vw 8vw 7vw; position: relative; z-index: 3; }
.eyebrow { margin: 0 0 18px; color: var(--cyan); font: 650 11px/1.2 var(--mono); letter-spacing: .16em; }
h1, h2, h3, p { margin-top: 0; }
h1 { max-width: 700px; margin-bottom: 26px; font: 620 clamp(64px, 7.2vw, 128px)/.82 var(--display); letter-spacing: -.045em; text-transform: uppercase; }
h1 em { color: var(--gold); font-style: normal; font-weight: 400; }
.dek { max-width: 610px; color: #b9c4c4; font-size: clamp(16px, 1.25vw, 21px); line-height: 1.55; }
.hero-actions { display: flex; gap: 12px; margin-top: 36px; }
.button { min-height: 44px; display: inline-flex; justify-content: center; align-items: center; padding: 0 18px; border: 1px solid var(--line); color: var(--bone); background: transparent; text-decoration: none; font: 650 11px/1 var(--mono); letter-spacing: .09em; text-transform: uppercase; cursor: pointer; }
.button.primary { color: #142024; background: var(--cyan); border-color: var(--cyan); }
.button:hover { border-color: var(--cyan); }
.hero-visual { position: relative; min-height: 710px; display: grid; grid-template-columns: 1fr 1fr; overflow: hidden; }
.hero-visual:after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(172,116,62,.14), rgba(16,23,27,.28) 49.8%, rgba(104,183,194,.14) 50.2%, rgba(16,23,27,.12)); pointer-events: none; }
.hero-face { position: relative; margin: 0; overflow: hidden; background: #19242a; }
.hero-face img { height: 100%; object-fit: cover; filter: saturate(.72) contrast(1.04); }
.hero-face-david img { object-position: 54% 45%; transform: scale(1.02); }
.hero-face-youxin img { object-position: 45% 50%; }
.hero-face figcaption { position: absolute; z-index: 2; bottom: 46px; left: 30px; display: flex; flex-direction: column; gap: 5px; text-shadow: 0 2px 14px #000; }
.hero-face-youxin figcaption { left: auto; right: 30px; text-align: right; }
.hero-face figcaption b { font: 650 26px/1 var(--display); letter-spacing: .08em; }
.hero-face figcaption span { color: var(--cyan); font: 600 9px/1 var(--mono); letter-spacing: .14em; }
.hero-glass-copy { position: absolute; z-index: 3; inset: 24px; display: flex; justify-content: space-between; align-items: flex-start; color: rgba(239,244,240,.6); font: 600 9px/1 var(--mono); letter-spacing: .14em; }
.hero-stats { grid-column: 1/-1; display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); background: rgba(8,13,16,.54); }
.hero-stats div { min-height: 94px; display: flex; align-items: center; gap: 14px; padding: 22px 3vw; border-right: 1px solid var(--line); }
.hero-stats strong { color: var(--gold); font: 500 30px/1 var(--display); }
.hero-stats span { color: var(--muted); font: 600 10px/1.3 var(--mono); letter-spacing: .1em; text-transform: uppercase; }

.section { padding: 100px 5vw; border-top: 1px solid var(--line); }
.section-heading { display: grid; grid-template-columns: 1.2fr .8fr; gap: 10vw; align-items: end; margin-bottom: 54px; }
.section-heading h2, .method-title h2 { margin: 0; font: 520 clamp(42px, 5vw, 82px)/.93 var(--display); letter-spacing: -.035em; text-transform: uppercase; }
.section-heading > p { margin: 0 0 4px; color: #aeb9b9; line-height: 1.6; }
.section-heading.compact { margin-bottom: 40px; }

.protocol { background: var(--bone); color: var(--ink); }
.protocol .eyebrow { color: var(--cyan-dim); }
.protocol .section-heading > p { color: #4c5a5e; }
.reference-grid { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid rgba(16,23,27,.18); }
.reference-card { min-width: 0; border-right: 1px solid rgba(16,23,27,.18); background: #f4f5f2; }
.reference-card:last-child { border-right: 0; }
.reference-card figure { height: 300px; margin: 0; overflow: hidden; background: #cdd4d2; }
.reference-card figure img { height: 100%; object-fit: cover; filter: saturate(.82); transition: transform .5s ease; }
.reference-card:hover figure img { transform: scale(1.025); }
.reference-card.geography figure img { filter: saturate(.55) contrast(1.03); }
.reference-body { padding: 22px; }
.reference-role { display: inline-block; margin-bottom: 16px; padding: 6px 8px; color: #183035; background: rgba(80,127,136,.14); font: 700 9px/1 var(--mono); letter-spacing: .12em; }
.reference-card.finish .reference-role { color: #60451d; background: rgba(216,179,110,.24); }
.reference-card.geography .reference-role { color: #762c2c; background: rgba(185,76,76,.13); }
.reference-body h3 { margin-bottom: 10px; font: 650 21px/1 var(--display); text-transform: uppercase; }
.reference-body p { min-height: 78px; margin-bottom: 18px; color: #475459; font-size: 13px; line-height: 1.45; }
.reference-body small { color: #738083; font: 500 8px/1.35 var(--mono); overflow-wrap: anywhere; }
.hard-rules { display: grid; grid-template-columns: 48px 1fr 48px 1fr 48px 1fr; gap: 16px; margin-top: 38px; padding-top: 30px; border-top: 1px solid rgba(16,23,27,.18); }
.rule-number { color: var(--cyan-dim); font: 500 28px/1 var(--display); }
.hard-rules p { margin: 0; color: #475459; font-size: 13px; line-height: 1.55; }
.hard-rules b { display: block; color: var(--ink); }

.chunks { background: #121b20; }
.chunk-tabs { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.chunk-tab { display: grid; grid-template-columns: auto 1fr; grid-template-rows: auto auto; column-gap: 16px; padding: 25px 22px; color: var(--muted); background: transparent; border: 0; border-right: 1px solid var(--line); text-align: left; cursor: pointer; }
.chunk-tab:last-child { border-right: 0; }
.chunk-tab span { grid-row: 1/3; align-self: center; color: #637278; font: 400 34px/1 var(--display); }
.chunk-tab b { font: 600 18px/1.2 var(--display); text-transform: uppercase; }
.chunk-tab small { margin-top: 4px; font: 500 9px/1 var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.chunk-tab.active { color: var(--bone); background: rgba(141,199,207,.08); box-shadow: inset 0 -2px var(--cyan); }
.chunk-tab.active span { color: var(--gold); }
.chunk-detail { min-height: 520px; display: grid; grid-template-columns: 1fr 1fr; background: #0c1215; }
.chunk-detail figure { position: relative; margin: 0; overflow: hidden; }
.chunk-detail figure:after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, transparent 65%, #0c1215); }
.chunk-detail figure img { height: 100%; object-fit: cover; filter: saturate(.55) contrast(1.05); }
.chunk-detail figcaption { position: absolute; z-index: 2; left: 20px; bottom: 18px; padding: 8px 10px; color: #fff; background: rgba(116,35,35,.86); font: 700 9px/1 var(--mono); letter-spacing: .11em; }
.chunk-copy { padding: 52px 50px; }
.chunk-number { color: var(--gold); font: 600 10px/1 var(--mono); letter-spacing: .13em; }
.chunk-copy h3 { margin: 12px 0 18px; font: 560 clamp(36px, 4vw, 62px)/.95 var(--display); text-transform: uppercase; }
.chunk-logline { color: #bac5c4; font-size: 16px; line-height: 1.55; }
.beat-map { margin: 32px 0; border-top: 1px solid var(--line); }
.beat-map div { display: grid; grid-template-columns: 65px 1fr; padding: 16px 0; border-bottom: 1px solid var(--line); }
.beat-map time { color: var(--cyan); font: 600 10px/1.4 var(--mono); }
.beat-map p { margin: 0; color: #9caaaa; font-size: 13px; line-height: 1.5; }
.stress { display: grid; grid-template-columns: 120px 1fr; gap: 14px; margin: 0; color: #809095; font-size: 12px; line-height: 1.5; }
.stress b { color: var(--gold); font: 600 9px/1.4 var(--mono); letter-spacing: .1em; }

.comparison { padding-left: 2vw; padding-right: 2vw; background: #e6e9e6; color: var(--ink); }
.comparison .eyebrow { color: var(--cyan-dim); }
.comparison-heading { padding: 0 3vw; margin-bottom: 34px; }
.filter-group { justify-self: end; display: flex; border: 1px solid rgba(16,23,27,.22); }
.filter { min-height: 38px; padding: 0 13px; border: 0; border-right: 1px solid rgba(16,23,27,.16); color: #506065; background: transparent; font: 650 9px/1 var(--mono); letter-spacing: .07em; text-transform: uppercase; cursor: pointer; }
.filter:last-child { border-right: 0; }
.filter.active { color: #f2f6f3; background: var(--ink-2); }
.transport { min-height: 58px; display: flex; align-items: center; gap: 14px; padding: 0 18px; color: var(--bone); background: var(--ink-2); border-bottom: 1px solid #334249; }
.transport-button { align-self: stretch; min-width: 100px; border: 0; border-right: 1px solid var(--line); color: var(--bone); background: transparent; font: 600 10px/1 var(--mono); letter-spacing: .07em; text-transform: uppercase; cursor: pointer; }
.transport-button:hover { color: var(--cyan); }
.timeline-label { margin-left: 8px; color: var(--cyan); font: 600 9px/1 var(--mono); letter-spacing: .1em; }
.master-seek { flex: 1; accent-color: var(--gold); }
#timeReadout { width: 64px; font: 600 10px/1 var(--mono); }
.check { display: flex; align-items: center; gap: 6px; color: #a7b3b4; font: 600 9px/1 var(--mono); letter-spacing: .06em; text-transform: uppercase; }
.check input { accent-color: var(--cyan); }
.model-grid { display: grid; grid-template-columns: repeat(5, minmax(220px, 1fr)); align-items: start; border-left: 1px solid rgba(16,23,27,.2); }
.model-card { min-width: 0; color: var(--ink); background: #f2f3f0; border-right: 1px solid rgba(16,23,27,.2); border-bottom: 1px solid rgba(16,23,27,.2); }
.model-card[hidden] { display: none; }
.model-card > header { min-height: 82px; display: flex; justify-content: space-between; align-items: flex-start; gap: 8px; padding: 17px; }
.model-card > header > div { display: flex; gap: 10px; align-items: baseline; }
.model-index { color: var(--cyan-dim); font: 500 15px/1 var(--mono); }
.model-card h3 { margin: 0; font: 650 24px/1 var(--display); text-transform: uppercase; }
.lane-badge { flex: 0 0 auto; padding: 5px 6px; color: #20525a; background: rgba(80,127,136,.14); font: 700 7px/1 var(--mono); letter-spacing: .08em; }
.model-card[data-lane="adjacent"] .lane-badge { color: #6a4a18; background: rgba(216,179,110,.27); }
.model-route { min-height: 78px; margin: 0; padding: 0 17px 14px; }
.model-route span { display: block; color: #34454a; font: 600 9px/1.4 var(--mono); overflow-wrap: anywhere; }
.model-route small { display: block; margin-top: 7px; color: #718083; font-size: 10px; line-height: 1.35; }
.video-shell { position: relative; aspect-ratio: 16/9; overflow: hidden; color: var(--bone); background: #111a1e; }
.video-shell video { width: 100%; height: 100%; object-fit: contain; background: black; }
.video-empty { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 6px; background: radial-gradient(circle, #223239, #10171b 68%); }
.video-empty[hidden] { display: none; }
.video-empty b { font: 650 10px/1 var(--mono); letter-spacing: .12em; }
.video-empty small { color: #718187; font-size: 9px; }
.aperture { width: 26px; height: 26px; margin-bottom: 6px; border: 1px solid #50717a; border-radius: 50%; box-shadow: inset 0 0 0 7px #172329; }
.load-video { position: absolute; z-index: 2; bottom: 8px; left: 8px; padding: 7px 8px; color: #b8c8c9; background: rgba(11,17,20,.78); border: 1px solid rgba(206,231,234,.2); font: 600 8px/1 var(--mono); letter-spacing: .06em; cursor: pointer; }
.load-video input { display: none; }
.remove-video { position: absolute; z-index: 3; top: 8px; right: 8px; width: 25px; height: 25px; padding: 0; border: 1px solid rgba(255,255,255,.24); border-radius: 50%; color: white; background: rgba(10,15,18,.7); cursor: pointer; }
.receipt-grid { display: grid; grid-template-columns: 1fr 1fr; border-bottom: 1px solid rgba(16,23,27,.14); }
.receipt-grid label { min-height: 65px; padding: 11px 13px; border-right: 1px solid rgba(16,23,27,.11); border-top: 1px solid rgba(16,23,27,.11); color: #526267; font: 700 8px/1 var(--mono); letter-spacing: .07em; text-transform: uppercase; }
.receipt-grid label:nth-child(even) { border-right: 0; }
.receipt-grid label span { float: right; color: #9aa4a4; font-weight: 500; }
.receipt-grid input { display: block; width: 100%; margin-top: 8px; padding: 0; border: 0; outline: 0; color: var(--ink); background: transparent; font: 600 17px/1 var(--display); }
.model-card details summary { display: flex; justify-content: space-between; padding: 16px; color: #35464a; font: 650 9px/1 var(--mono); letter-spacing: .06em; text-transform: uppercase; cursor: pointer; list-style: none; }
.model-card details summary::-webkit-details-marker { display: none; }
.score-total { color: var(--cyan-dim); }
.rubric { padding: 0 16px 8px; }
.rubric label { display: grid; grid-template-columns: 1fr 80px 18px; align-items: center; gap: 8px; min-height: 31px; color: #526267; font-size: 9px; }
.rubric input { width: 100%; accent-color: var(--cyan-dim); }
.rubric output { color: var(--ink); font: 600 9px/1 var(--mono); }
.notes-label { display: block; padding: 10px 16px; color: #526267; font: 650 8px/1 var(--mono); letter-spacing: .07em; text-transform: uppercase; }
.notes-label textarea { width: 100%; min-height: 88px; margin-top: 8px; padding: 9px; resize: vertical; color: var(--ink); background: white; border: 1px solid rgba(16,23,27,.16); font: 400 11px/1.45 var(--body); text-transform: none; }
.usable-check { display: flex; gap: 8px; padding: 10px 16px 18px; color: #35464a; font: 650 8px/1 var(--mono); letter-spacing: .05em; text-transform: uppercase; }
.usable-check input { accent-color: var(--cyan-dim); }

.method { display: grid; grid-template-columns: .72fr 1.28fr; gap: 10vw; background: #11191e; }
.method-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.method-list li { display: grid; grid-template-columns: 60px 1fr; gap: 20px; padding: 24px 0; border-bottom: 1px solid var(--line); }
.method-list li > span { color: var(--gold); font: 400 24px/1 var(--display); }
.method-list b { font: 620 18px/1 var(--display); text-transform: uppercase; }
.method-list p { margin: 5px 0 0; color: #91a0a3; font-size: 13px; line-height: 1.45; }

.conclusions { background: #d9dfdc; color: var(--ink); }
.conclusions .eyebrow { color: var(--cyan-dim); }
.export-actions { justify-self: end; display: flex; gap: 8px; }
.conclusions .button { color: var(--ink); border-color: rgba(16,23,27,.28); }
.scoreboard { border: 1px solid rgba(16,23,27,.2); background: #eef0ed; }
.score-row { display: grid; grid-template-columns: 2fr repeat(4, 1fr); min-height: 60px; align-items: center; border-bottom: 1px solid rgba(16,23,27,.14); }
.score-row:last-child { border-bottom: 0; }
.score-row > span { height: 100%; display: flex; justify-content: center; align-items: center; padding: 12px 16px; border-right: 1px solid rgba(16,23,27,.1); font: 600 13px/1 var(--mono); }
.score-row > span:first-child { align-items: flex-start; justify-content: center; flex-direction: column; }
.score-row > span:last-child { border-right: 0; }
.score-row b { font: 650 18px/1 var(--display); text-transform: uppercase; }
.score-row small { margin-top: 4px; color: #758184; font: 600 8px/1 var(--mono); letter-spacing: .08em; }
.score-head { min-height: 38px; color: #657377; background: #d1d8d5; }
.score-head > span { align-items: center !important; font: 700 8px/1 var(--mono); letter-spacing: .08em; }
.usable-dot.yes { color: #296955; }
.decision-grid { display: grid; grid-template-columns: 1fr 1fr; margin-top: 28px; border: 1px solid rgba(16,23,27,.2); }
.decision-grid label { padding: 18px; border-right: 1px solid rgba(16,23,27,.14); border-bottom: 1px solid rgba(16,23,27,.14); color: #3d4b50; font: 700 9px/1 var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.decision-grid label:nth-child(even) { border-right: 0; }
.decision-grid label:nth-last-child(-n+2) { border-bottom: 0; }
.decision-grid textarea { width: 100%; min-height: 100px; margin-top: 12px; padding: 12px; resize: vertical; border: 1px solid rgba(16,23,27,.15); color: var(--ink); background: rgba(255,255,255,.46); font: 400 14px/1.5 var(--body); text-transform: none; }

footer { min-height: 140px; display: grid; grid-template-columns: 1fr 1.5fr auto; gap: 40px; align-items: center; padding: 30px 5vw; color: #7e8d90; background: #0b1114; border-top: 1px solid var(--line); }
footer div { display: flex; flex-direction: column; gap: 5px; }
footer b { color: var(--bone); font: 650 18px/1 var(--display); }
footer span, footer a { font: 600 9px/1 var(--mono); letter-spacing: .08em; }
footer p { margin: 0; font-size: 11px; line-height: 1.45; }
footer a { color: var(--cyan); text-decoration: none; text-transform: uppercase; }

@media (max-width: 1180px) {
  .model-grid { grid-template-columns: repeat(3, minmax(240px, 1fr)); }
  .reference-grid { grid-template-columns: 1fr 1fr; }
  .reference-card:nth-child(2) { border-right: 0; }
  .reference-card:nth-child(-n+2) { border-bottom: 1px solid rgba(16,23,27,.18); }
  .hard-rules { grid-template-columns: 40px 1fr; }
}

@media (max-width: 820px) {
  .glass-seam { left: 62%; }
  .site-header { grid-template-columns: 1fr auto; }
  .site-header nav { display: none; }
  .live-pill { font-size: 8px; }
  .hero { grid-template-columns: 1fr; grid-template-rows: auto auto auto; }
  .hero-copy { padding: 90px 7vw 54px; }
  h1 { font-size: clamp(60px, 18vw, 92px); }
  .hero-visual { min-height: 560px; }
  .hero-stats { grid-column: 1; grid-template-columns: 1fr 1fr; }
  .hero-stats div:nth-child(2) { border-right: 0; }
  .section { padding: 74px 5vw; }
  .section-heading, .method { grid-template-columns: 1fr; gap: 30px; }
  .chunk-detail { grid-template-columns: 1fr; }
  .chunk-detail figure { min-height: 370px; }
  .chunk-detail figure:after { background: linear-gradient(transparent 70%, #0c1215); }
  .chunk-copy { padding: 38px 28px; }
  .comparison-heading { grid-template-columns: 1fr; }
  .filter-group { justify-self: start; overflow-x: auto; max-width: 100%; }
  .transport { flex-wrap: wrap; padding: 10px; }
  .master-seek { order: 5; flex-basis: 70%; }
  .timeline-label { order: 4; }
  #timeReadout { order: 6; }
  .model-grid { grid-template-columns: 1fr 1fr; }
  footer { grid-template-columns: 1fr; gap: 18px; }
}

@media (max-width: 560px) {
  .wordmark small, .wordmark i { display: none; }
  .hero-face figcaption { left: 12px; bottom: 20px; }
  .hero-face-youxin figcaption { left: auto; right: 12px; }
  .hero-face figcaption b { font-size: 19px; }
  .hero-glass-copy { display: none; }
  .hero-stats div { min-height: 76px; }
  .hero-stats strong { font-size: 25px; }
  .reference-grid { grid-template-columns: 1fr; }
  .reference-card { border-right: 0; border-bottom: 1px solid rgba(16,23,27,.18); }
  .reference-card:last-child { border-bottom: 0; }
  .reference-card figure { height: 340px; }
  .chunk-tabs { grid-template-columns: 1fr; }
  .chunk-tab { border-right: 0; border-bottom: 1px solid var(--line); }
  .model-grid { grid-template-columns: 1fr; }
  .filter { padding: 0 9px; white-space: nowrap; }
  .transport-button { min-width: 76px; }
  .decision-grid { grid-template-columns: 1fr; }
  .decision-grid label { border-right: 0; border-bottom: 1px solid rgba(16,23,27,.14) !important; }
  .decision-grid label:last-child { border-bottom: 0 !important; }
  .score-row { grid-template-columns: 1.7fr repeat(4, .8fr); }
  .score-row > span { padding: 8px 5px; font-size: 10px; }
  .score-row b { font-size: 14px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *:before, *:after { transition: none !important; }
}