/* THE FOURTH KNOCK — portfolio case study. The game's own type system and palette, translated for the web.
   Mobile-first; one stylesheet, no framework. */
@font-face { font-family: 'Barlow Condensed'; font-weight: 500; font-display: swap; src: url('fonts/BarlowCondensed-500.woff2') format('woff2'); }
@font-face { font-family: 'Barlow Condensed'; font-weight: 600; font-display: swap; src: url('fonts/BarlowCondensed-600.woff2') format('woff2'); }
@font-face { font-family: 'Barlow Condensed'; font-weight: 700; font-display: swap; src: url('fonts/BarlowCondensed-700.woff2') format('woff2'); }
@font-face { font-family: 'Newsreader'; font-weight: 300 800; font-style: normal; font-display: swap; src: url('fonts/Newsreader-var.woff2') format('woff2'); }
@font-face { font-family: 'Newsreader'; font-weight: 300 800; font-style: italic; font-display: swap; src: url('fonts/Newsreader-Italic-var.woff2') format('woff2'); }
@font-face { font-family: 'Courier Prime'; font-weight: 400; font-display: swap; src: url('fonts/CourierPrime-400.woff2') format('woff2'); }
@font-face { font-family: 'Courier Prime'; font-weight: 700; font-display: swap; src: url('fonts/CourierPrime-700.woff2') format('woff2'); }

:root {
  --ink: #111920; --ink-2: #18232b; --ink-3: #22303a; --night: #0b1117;
  --paper: #efe4c8; --paper-2: #e2d3ae; --paper-3: #cdbb90; --paper-ink: #2a2620;
  --brass: #cda75f; --brass-2: #a5823f; --rust: #b3533b; --moss: #7d8a52; --storm: #2f4759; --mist: #aab7b4;
  --amber: #f0c88b; --teak: #4b3124;
  --cream: rgba(239, 228, 200, .9); --cream-dim: rgba(239, 228, 200, .68); --cream-faint: rgba(239, 228, 200, .42); --rule: rgba(239, 228, 200, .14);
  --serif: 'Newsreader', Georgia, 'Times New Roman', serif;
  --cond: 'Barlow Condensed', 'Arial Narrow', 'Helvetica Neue', sans-serif;
  --type: 'Courier Prime', 'Courier New', monospace;
  --gutter: clamp(20px, 5vw, 64px);
  --maxw: 1200px;
  --textw: 42rem;
  --ease: cubic-bezier(.22, .72, .18, 1);
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 72px; }
body { margin: 0; background: var(--night); color: var(--cream); font: 400 1.0625rem/1.62 var(--serif); font-optical-sizing: auto; overflow-x: hidden; }
img, video, svg { display: block; max-width: 100%; }
img, video { height: auto; }
a { color: inherit; }
p { margin: 0 0 1em; }
h1, h2, h3, h4 { margin: 0; font-weight: 700; }
::selection { background: var(--brass); color: var(--ink); }
:focus-visible { outline: 2px solid var(--brass); outline-offset: 3px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: 12px; top: -60px; z-index: 50; padding: 10px 14px; background: var(--paper); color: var(--ink); font: 700 14px var(--cond); letter-spacing: .12em; text-transform: uppercase; }
.skip:focus { top: 12px; }

/* ---------- the knock mark: three even strokes, a pause, one taller brass stroke ---------- */
.knock-mark { display: inline-flex; align-items: flex-end; gap: .1em; transform: skewX(-12deg); }
.knock-mark i { display: block; width: .13em; height: 1em; background: var(--paper); border-radius: 1px; }
.knock-mark i:nth-child(4) { margin-left: .22em; height: 1.26em; background: var(--brass); }

/* ---------- navigation ---------- */
.nav { position: fixed; inset: 0 0 auto; z-index: 30; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 12px var(--gutter);
  transition: background .4s, box-shadow .4s; }
.nav.solid { background: rgba(11, 17, 23, .92); box-shadow: 0 1px 0 var(--rule); -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px); }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font: 700 1.05rem/1 var(--cond); letter-spacing: .06em; text-transform: uppercase; color: var(--paper); }
.brand .knock-mark { font-size: 1.15rem; }
.nav-links { display: none; gap: 24px; font: 600 .82rem var(--cond); letter-spacing: .16em; text-transform: uppercase; }
.nav-links a { text-decoration: none; color: var(--cream-dim); padding: 6px 0; }
.nav-links a:hover { color: var(--paper); }
.nav .btn { padding: 9px 14px 8px; font-size: .82rem; }

/* ---------- buttons ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 44px; padding: 13px 22px 12px; border: 1.5px solid var(--paper); border-radius: 2px;
  font: 700 .95rem/1 var(--cond); letter-spacing: .14em; text-transform: uppercase; text-decoration: none; color: var(--paper); background: transparent; cursor: pointer;
  transition: transform .2s var(--ease), box-shadow .2s var(--ease), background .2s; }
.btn:hover { transform: translate(-1px, -1px); }
.btn.primary { background: var(--paper); color: var(--ink); box-shadow: 4px 4px 0 var(--rust); }
.btn.primary:hover { box-shadow: 6px 6px 0 var(--rust); }
.btn .arrow { font-size: .8em; }

/* ---------- layout ---------- */
.wrap { width: min(var(--maxw), 100% - 2 * var(--gutter)); margin-inline: auto; }
.text { max-width: var(--textw); }
section { position: relative; padding: clamp(72px, 12vw, 150px) 0; }
section + section { border-top: 1px solid var(--rule); }
.eyebrow { display: flex; align-items: center; gap: 12px; margin: 0 0 18px; font: 700 .78rem/1.2 var(--type); letter-spacing: .08em; text-transform: uppercase; color: var(--brass); }
.eyebrow::after { content: ''; flex: 0 0 48px; height: 1px; background: currentColor; opacity: .6; }
.h2 { font: 700 clamp(2.1rem, 7.5vw, 4.4rem)/.95 var(--cond); letter-spacing: .01em; text-transform: uppercase; color: var(--paper); margin: 0 0 .5em; max-width: 18ch; }
.h3 { font: 700 clamp(1.45rem, 4.4vw, 2.1rem)/1.02 var(--cond); letter-spacing: .02em; text-transform: uppercase; color: var(--paper); margin: 0 0 .55em; }
.lead { font-size: clamp(1.15rem, 2.6vw, 1.38rem); line-height: 1.55; color: var(--paper); }
.quote { margin: 0; font: italic 400 clamp(1.7rem, 5.6vw, 3.1rem)/1.14 var(--serif); color: var(--paper); letter-spacing: -.005em; text-wrap: balance; }
.quote em { font-style: normal; color: var(--brass); }
.takeaway { display: flex; gap: 16px; align-items: flex-start; margin: 34px 0 0; padding: 20px 0 0; border-top: 1px solid var(--rule); font: italic 500 clamp(1.18rem, 3vw, 1.5rem)/1.35 var(--serif); color: var(--paper); }
.takeaway .knock-mark { flex: none; font-size: 1.1rem; margin-top: .25em; }
.muted { color: var(--cream-dim); }
.mono { font-family: var(--type); }

/* figures */
figure { margin: 0; }
.fig { position: relative; overflow: hidden; border-radius: 3px; background: var(--ink-2); box-shadow: 0 0 0 1px var(--rule), 0 24px 60px rgba(0, 0, 0, .35); }
.fig img, .fig video { width: 100%; }
figcaption, .cap { margin-top: 10px; font: 400 .8rem/1.45 var(--type); color: var(--cream-faint); letter-spacing: .01em; }
.cap b, figcaption b { color: var(--cream-dim); font-weight: 700; }
.tag { display: inline-block; padding: 3px 8px 2px; border: 1px solid currentColor; border-radius: 2px; font: 700 .7rem/1.2 var(--type); letter-spacing: .1em; text-transform: uppercase; }
.tag.before { color: var(--mist); }
.tag.after { color: var(--brass); }
.tag.rejected { color: var(--rust); }
.stack { display: grid; gap: 18px; }
.grid-2 { display: grid; gap: 22px; }
.grid-3 { display: grid; gap: 18px; }

/* reveal (JS adds .in; without JS everything is visible) */
.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity .9s var(--ease), transform .9s var(--ease); }
.js .reveal.in { opacity: 1; transform: none; }

/* ---------- hero ---------- */
.hero { position: relative; min-height: 100svh; display: grid; align-items: end; padding: 110px 0 clamp(48px, 9vh, 96px); overflow: hidden; border: 0; }
.hero-media, .hero-media img, .hero-media video { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: 58% 50%; }
.hero-media video { opacity: 0; transition: opacity 1.4s ease; }
.hero-media video.on { opacity: 1; }
.hero::after { content: ''; position: absolute; inset: 0; background:
  linear-gradient(180deg, rgba(11, 17, 23, .55) 0%, rgba(11, 17, 23, .1) 30%, rgba(11, 17, 23, .35) 58%, rgba(11, 17, 23, .96) 100%),
  linear-gradient(90deg, rgba(11, 17, 23, .7) 0%, rgba(11, 17, 23, .15) 60%); }
.hero-inner { position: relative; z-index: 2; }
.wordmark { display: flex; align-items: center; gap: .26em; font-size: clamp(3.4rem, 16vw, 8.4rem); margin: 0 0 .28em; }
.wordmark .knock-mark { font-size: .82em; }
.wordmark .knock-mark i { width: .085em; }
.wm-text { display: flex; flex-direction: column; font: 700 1em/.84 var(--cond); letter-spacing: .01em; text-transform: uppercase; }
.wm-the { font-size: .27em; letter-spacing: .5em; color: var(--cream-dim); margin-bottom: .22em; }
.wm-fourth { color: var(--paper); }
.wm-knock { color: var(--brass); }
.hero .lead { max-width: 36ch; margin-bottom: 1.1em; text-shadow: 0 2px 18px rgba(0, 0, 0, .6); }
.teaser { margin: 0 0 1.6em; font: 400 clamp(1rem, 2.6vw, 1.15rem)/1.55 var(--type); color: var(--cream); text-shadow: 0 2px 14px rgba(0, 0, 0, .7); }
.ctas { display: flex; flex-wrap: wrap; gap: 14px; }
.hero-meta { margin: 18px 0 0; font: 600 .78rem var(--cond); letter-spacing: .18em; text-transform: uppercase; color: var(--cream-dim); }
.byline { margin: 0 0 20px; font: 700 .78rem/1.3 var(--type); letter-spacing: .08em; text-transform: uppercase; color: var(--brass); }

/* ---------- trailer ---------- */
.trailer-section { padding-top: 0; border-top: 0; }
.player { position: relative; aspect-ratio: 16 / 9; border-radius: 4px; overflow: hidden; background: #000; box-shadow: 0 0 0 1px var(--rule), 0 40px 90px rgba(0, 0, 0, .55); }
.player img, .player video { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
/* the disc sits bottom-left beside the label, clear of the faces in the poster */
.player-btn { position: absolute; inset: 0; display: grid; grid-template-columns: auto 1fr; align-content: end; align-items: center; column-gap: clamp(12px, 2vw, 20px); width: 100%; border: 0; padding: clamp(14px, 3vw, 28px); background: linear-gradient(180deg, rgba(11, 17, 23, 0) 45%, rgba(11, 17, 23, .72)); cursor: pointer; color: var(--paper); text-align: left; }
.play-disc { display: grid; place-items: center; width: clamp(48px, 7vw, 80px); aspect-ratio: 1; border-radius: 50%; background: rgba(239, 228, 200, .94); color: var(--ink); box-shadow: 5px 5px 0 var(--rust); transition: transform .25s var(--ease); }
.player-btn:hover .play-disc { transform: scale(1.06); }
.play-disc svg { width: 34%; margin-left: 8%; }
.player-label { font: 700 clamp(.8rem, 2vw, 1rem) var(--cond); letter-spacing: .18em; text-transform: uppercase; }
.player-label small { display: block; margin-top: 4px; font: 400 .78rem var(--type); letter-spacing: .02em; text-transform: none; color: var(--cream-dim); }

/* ---------- facts: 9:08 / 9:14 ---------- */
.facts { display: grid; gap: 14px; margin: 34px 0; }
.fact { padding: 20px 22px; border: 1px solid var(--rule); border-radius: 3px; background: linear-gradient(180deg, rgba(239, 228, 200, .04), rgba(239, 228, 200, .015)); }
.fact .time { display: block; white-space: nowrap; font: 700 clamp(2.4rem, 9vw, 3.6rem)/1 var(--type); letter-spacing: -.02em; color: var(--paper); }
.fact .time small { margin-left: .3em; font: 700 .3em var(--cond); letter-spacing: .16em; color: var(--cream-dim); }
.fact p { margin: 8px 0 0; color: var(--cream-dim); }
.fact.heard .time { color: var(--brass); }
.verdict { margin: 26px 0 0; font: 700 clamp(1.6rem, 5.4vw, 2.6rem)/1.05 var(--cond); text-transform: uppercase; letter-spacing: .02em; color: var(--paper); }
.verdict span { display: block; color: var(--brass); }

/* ---------- paper sections (case-file) ---------- */
.paper { background: var(--paper); color: var(--paper-ink); border-top: 0 !important; }
.paper + section { border-top: 0; }
.paper .eyebrow { color: var(--rust); }
.paper .h2, .paper .h3, .paper .quote, .paper .lead { color: var(--paper-ink); }
.paper .muted { color: rgba(42, 38, 32, .66); }
.paper::before { content: ''; position: absolute; inset: 0; pointer-events: none; opacity: .5;
  background: repeating-linear-gradient(180deg, transparent 0 33px, rgba(42, 38, 32, .06) 33px 34px); }
.roles { display: grid; gap: 18px; margin-top: 34px; }
.role-card { position: relative; padding: 24px 24px 20px; border: 1.5px solid rgba(42, 38, 32, .8); border-radius: 3px; background: rgba(255, 252, 240, .45); }
.role-card h3 { font: 700 1.15rem var(--cond); letter-spacing: .16em; text-transform: uppercase; margin: 0 0 14px; }
.role-card ul { margin: 0; padding: 0; list-style: none; columns: 2 12rem; column-gap: 24px; }
.role-card li { break-inside: avoid; padding: 6px 0 6px 18px; position: relative; font-size: 1rem; line-height: 1.35; border-bottom: 1px dashed rgba(42, 38, 32, .2); }
.role-card li::before { content: ''; position: absolute; left: 0; top: .9em; width: 8px; height: 2px; background: var(--rust); }
.role-card.exec li::before { background: rgba(42, 38, 32, .5); }
.stamp { position: absolute; right: 16px; top: -14px; padding: 5px 12px 3px; border: 3px solid var(--rust); color: var(--rust); background: var(--paper); font: 700 .78rem var(--cond); letter-spacing: .2em; text-transform: uppercase; transform: rotate(-3deg); }
.role-line { margin: 30px 0 0; font: 700 clamp(.9rem, 2.4vw, 1.05rem)/1.5 var(--cond); letter-spacing: .16em; text-transform: uppercase; color: var(--rust); }

/* ---------- north star / art direction ---------- */
.duo { display: grid; gap: 18px; margin: 36px 0; }
.duo .label { display: block; margin-bottom: 10px; font: 700 .8rem var(--cond); letter-spacing: .2em; text-transform: uppercase; color: var(--brass); }
.palette { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin: 30px 0; }
.chip { display: flex; align-items: center; gap: 12px; padding: 10px; border: 1px solid var(--rule); border-radius: 3px; }
.chip i { flex: none; width: 36px; height: 36px; border-radius: 2px; box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .12); }
.chip b { display: block; font: 700 .9rem/1.1 var(--cond); letter-spacing: .1em; text-transform: uppercase; color: var(--paper); }
.chip span { font: 400 .74rem var(--type); color: var(--cream-faint); }

/* ---------- gameplay ---------- */
.loopchain { display: flex; flex-wrap: wrap; gap: 6px 10px; margin: 26px 0 38px; padding: 0; list-style: none; font: 700 clamp(.82rem, 2.3vw, .98rem)/1.3 var(--cond); letter-spacing: .12em; text-transform: uppercase; }
.loopchain li { display: inline-flex; align-items: center; gap: 10px; color: var(--paper); }
.loopchain li:not(:last-child)::after { content: '→'; color: var(--brass); }
.steps { display: grid; gap: 22px; margin: 0; padding: 0; list-style: none; counter-reset: step; }
.step { counter-increment: step; }
.step h3 { display: flex; align-items: baseline; gap: 10px; margin: 14px 0 6px; font: 700 1.2rem/1.1 var(--cond); letter-spacing: .1em; text-transform: uppercase; color: var(--paper); }
.step h3::before { content: counter(step, decimal-leading-zero); font: 700 .78rem var(--type); color: var(--brass); letter-spacing: .04em; }
.step p { margin: 0; font-size: .98rem; color: var(--cream-dim); }
.casenotes { margin-top: clamp(56px, 9vw, 110px); display: grid; gap: 26px; align-items: center; }
.contradiction { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 10px; margin: 22px 0; font-family: var(--type); }
.contradiction div { padding: 14px 10px; border: 1px solid var(--rule); border-radius: 3px; text-align: center; }
.contradiction b { display: block; font-size: clamp(1.7rem, 6vw, 2.3rem); line-height: 1; color: var(--paper); }
.contradiction small { display: block; margin-top: 6px; font-size: .72rem; color: var(--cream-faint); text-transform: uppercase; letter-spacing: .08em; }
.contradiction .gap { font: 700 .8rem var(--cond); letter-spacing: .12em; text-transform: uppercase; color: var(--rust); text-align: center; }

/* ---------- pivots ---------- */
.pivot { margin-top: clamp(64px, 10vw, 130px); }
.pivot:first-of-type { margin-top: 44px; }
.pivot-head { display: grid; gap: 6px; margin-bottom: 26px; }
.pivot-num { font: 700 .8rem var(--type); color: var(--brass); letter-spacing: .06em; }
.ba { display: grid; gap: 18px; margin: 26px 0; }
.ba-col { display: grid; gap: 14px; align-content: start; }
.ba-col > .tag { justify-self: start; }
.arrowline { display: none; }
.diagram { padding: clamp(16px, 3vw, 28px); border: 1px solid var(--rule); border-radius: 3px; background: rgba(239, 228, 200, .03); }
.diagram svg { width: 100%; height: auto; }
.diagram figcaption { margin-top: 14px; }
.latch-grid { display: grid; gap: 18px; }
.numbers { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin: 14px 0 0; }
.numbers div { padding: 10px 8px; border: 1px solid rgba(179, 83, 59, .45); border-radius: 3px; text-align: center; }
.numbers b { display: block; font: 700 1.35rem/1 var(--type); color: var(--paper); }
.numbers span { display: block; margin-top: 5px; font: 400 .68rem/1.25 var(--type); color: var(--cream-faint); }
.fail { margin: 12px 0 0; font: 700 .82rem/1.4 var(--type); color: var(--rust); }
.latch-steps { display: grid; gap: 8px; margin: 14px 0 0; padding: 0; list-style: none; counter-reset: ls; }
.latch-steps li { counter-increment: ls; display: flex; gap: 12px; align-items: baseline; padding: 10px 12px; border: 1px solid rgba(205, 167, 95, .4); border-radius: 3px; font: 600 1rem/1.3 var(--cond); letter-spacing: .06em; text-transform: uppercase; color: var(--paper); }
.latch-steps li::before { content: counter(ls); font: 700 .9rem var(--type); color: var(--brass); }

/* ---------- opening evolution ---------- */
.evo { display: grid; gap: 26px; margin-top: 34px; }
.evo-col { display: grid; gap: 10px; align-content: start; }
.evo-col h3 { font: 700 1.05rem/1.15 var(--cond); letter-spacing: .12em; text-transform: uppercase; color: var(--paper); margin: 0; }
.evo-col h3 small { display: block; margin-bottom: 4px; font: 700 .72rem var(--type); letter-spacing: .06em; color: var(--brass); }
.evo-col .fig img { aspect-ratio: 12 / 5; object-fit: cover; }
.verdicts { margin: 4px 0 0; padding: 0; list-style: none; font-size: .92rem; line-height: 1.45; }
.verdicts li { padding-left: 1.2em; position: relative; color: var(--cream-dim); }
.verdicts li::before { position: absolute; left: 0; font: 700 .9em var(--type); }
.verdicts .plus::before { content: '+'; color: var(--moss); }
.verdicts .minus::before { content: '–'; color: var(--rust); }
.verdicts .final::before { content: '✓'; color: var(--brass); }
.evo-col.final .fig { box-shadow: 0 0 0 2px var(--brass), 0 24px 60px rgba(0, 0, 0, .35); }

/* ---------- orchestration ---------- */
.org { display: grid; gap: 14px; margin: 34px 0 0; }
.node { position: relative; padding: 18px 20px; border: 1px solid var(--rule); border-radius: 3px; background: rgba(239, 228, 200, .03); }
.node h3 { font: 700 1.15rem/1.1 var(--cond); letter-spacing: .1em; text-transform: uppercase; color: var(--paper); margin: 0 0 6px; }
.node p { margin: 0; font-size: .95rem; color: var(--cream-dim); }
.node .kind { display: block; margin-bottom: 8px; font: 700 .7rem var(--type); letter-spacing: .08em; text-transform: uppercase; color: var(--brass); }
.node.director { border: 1.5px solid var(--brass); background: linear-gradient(180deg, rgba(205, 167, 95, .12), rgba(205, 167, 95, .03)); text-align: center; }
.node.director h3 { font-size: 1.5rem; }
.link-rule { height: 26px; width: 1px; margin: 0 auto; background: linear-gradient(var(--brass), var(--rule)); }
.link-label { text-align: center; font: 400 .74rem var(--type); color: var(--cream-faint); margin: -4px 0 0; }
.builders, .toolgroups { display: grid; gap: 14px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.chips span { padding: 4px 9px 3px; border: 1px solid var(--rule); border-radius: 999px; font: 400 .76rem var(--type); color: var(--cream); }
.stack-table { width: 100%; margin: 44px 0 0; border-collapse: collapse; font-size: .96rem; }
.stack-table caption { text-align: left; margin-bottom: 12px; }
.stack-table th, .stack-table td { text-align: left; vertical-align: top; padding: 12px 0; border-bottom: 1px solid var(--rule); }
.stack-table th { width: 38%; padding-right: 16px; font: 700 .98rem/1.25 var(--cond); letter-spacing: .06em; text-transform: uppercase; color: var(--paper); }
.stack-table th small { display: block; margin-top: 3px; font: 400 .72rem var(--type); letter-spacing: 0; text-transform: none; color: var(--brass); }
.stack-table td { color: var(--cream-dim); }

/* ---------- audio ---------- */
.counts { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin: 32px 0; }
.count { padding: 18px 16px; border: 1px solid var(--rule); border-radius: 3px; }
.count b { display: block; font: 700 clamp(2.2rem, 8vw, 3.2rem)/1 var(--cond); color: var(--paper); }
.count span { display: block; margin-top: 6px; font: 600 .78rem/1.3 var(--cond); letter-spacing: .16em; text-transform: uppercase; color: var(--cream-dim); }
.walls { margin: 44px 0 0; padding: clamp(20px, 3.4vw, 34px); border: 1px solid var(--rule); border-radius: 3px; background: linear-gradient(180deg, rgba(47, 71, 89, .28), rgba(47, 71, 89, .06)); }
.wall-btns { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin: 18px 0 12px; }
.wall-btn { display: grid; gap: 4px; min-height: 64px; padding: 12px 14px; border: 1px solid var(--rule); border-radius: 3px; background: rgba(11, 17, 23, .5); color: var(--paper); text-align: left; cursor: pointer; font: 700 .95rem/1.1 var(--cond); letter-spacing: .1em; text-transform: uppercase; transition: border-color .2s, background .2s; }
.wall-btn span { font: 400 .74rem/1.3 var(--type); letter-spacing: 0; text-transform: none; color: var(--cream-faint); }
.wall-btn[aria-pressed='true'] { border-color: var(--brass); background: rgba(205, 167, 95, .14); }
.wall-btn[aria-pressed='true'] b::after { content: ' ◼'; color: var(--brass); font-size: .7em; }
.knocks { margin: 44px 0 0; display: grid; gap: 22px; align-items: center; }
.knock-player { padding: clamp(20px, 3.6vw, 36px); border: 1px solid var(--rule); border-radius: 3px; background: rgba(11, 17, 23, .6); }
.knock-bars { display: flex; align-items: flex-end; gap: 14px; height: 96px; margin: 0 0 20px; transform: skewX(-12deg); }
.knock-bars i { display: block; width: 14px; height: 72px; background: var(--paper); border-radius: 2px; opacity: .14; transform: scaleY(.3); transform-origin: bottom; transition: opacity .18s, transform .22s var(--ease); }
.knock-bars i:nth-child(4) { margin-left: 34px; height: 92px; background: var(--brass); }
.knock-bars i.on { opacity: 1; transform: none; }
.wave { width: 100%; height: 64px; margin: 6px 0 18px; }
.wave path { fill: var(--brass); opacity: .75; }
details { margin-top: 18px; border-top: 1px solid var(--rule); padding-top: 12px; }
summary { cursor: pointer; font: 700 .85rem var(--cond); letter-spacing: .16em; text-transform: uppercase; color: var(--brass); }
details ul { margin: 12px 0 0; padding-left: 1.1em; color: var(--cream-dim); font-size: .95rem; }
details li { margin-bottom: 6px; }

/* ---------- AI QA ---------- */
.qa-lines { margin: 28px 0 22px; font-family: var(--serif); }
.qa-line { display: block; font: italic 500 clamp(2.4rem, 10vw, 5rem)/1.05 var(--serif); color: var(--paper); }
.qa-line.wrong { position: relative; display: inline-block; color: var(--cream-faint); }
.qa-line.wrong::after { content: ''; position: absolute; left: -2%; right: -2%; top: 55%; height: .09em; background: var(--rust); transform: rotate(-2deg); }
.qa-meter { display: grid; grid-template-columns: repeat(18, 1fr); gap: 4px; max-width: 520px; margin: 18px 0 8px; }
.qa-meter i { height: 22px; border-radius: 2px; background: var(--rust); opacity: .85; }
.qa-meter i.ok { background: var(--moss); }

/* ---------- polish ---------- */
.polish-list { display: flex; flex-wrap: wrap; gap: 8px; margin: 26px 0 36px; padding: 0; list-style: none; }
.polish-list li { padding: 6px 12px 5px; border: 1px solid var(--rule); border-radius: 999px; font: 600 .82rem var(--cond); letter-spacing: .1em; text-transform: uppercase; color: var(--cream); }
.twomm { display: grid; gap: 22px; align-items: center; }
.big-number { font: 700 clamp(4.4rem, 18vw, 8rem)/.9 var(--cond); color: var(--brass); letter-spacing: -.01em; }
.big-number small { display: block; margin-top: 10px; font: 700 .9rem var(--cond); letter-spacing: .18em; text-transform: uppercase; color: var(--cream-dim); }
.flicker-labels { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 10px; }

/* ---------- timeline ---------- */
.timeline { margin: 34px 0 0; padding: 0; list-style: none; border-left: 1px solid var(--rule); }
.timeline li { position: relative; display: grid; grid-template-columns: 96px 1fr; gap: 14px; align-items: center; padding: 12px 0 12px 22px; }
.timeline li::before { content: ''; position: absolute; left: -5px; top: 50%; width: 9px; height: 9px; margin-top: -4.5px; border-radius: 50%; background: var(--night); border: 1.5px solid var(--brass); }
.timeline li.v1::before { background: var(--brass); }
.timeline .thumb { width: 96px; aspect-ratio: 8 / 5; border-radius: 2px; overflow: hidden; background: var(--ink-2); box-shadow: 0 0 0 1px var(--rule); display: grid; place-items: center; }
.timeline .thumb img { width: 100%; height: 100%; object-fit: cover; }
.timeline .thumb .knock-mark { font-size: 1.3rem; }
.timeline h3 { font: 700 1.05rem/1.15 var(--cond); letter-spacing: .1em; text-transform: uppercase; color: var(--paper); margin: 0 0 3px; }
.timeline p { margin: 0; font-size: .92rem; line-height: 1.4; color: var(--cream-dim); }

/* ---------- snapshot ---------- */
.snapshot { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0; margin: 30px 0 0; border-top: 1.5px solid rgba(42, 38, 32, .8); }
.snapshot div { padding: 16px 12px 16px 0; border-bottom: 1px dashed rgba(42, 38, 32, .3); }
.snapshot b { display: block; font: 700 clamp(1.5rem, 5vw, 2.1rem)/1 var(--cond); color: var(--paper-ink); }
.snapshot span { display: block; margin-top: 6px; font: 400 .82rem/1.3 var(--type); color: rgba(42, 38, 32, .72); }

/* ---------- lessons ---------- */
.lessons { display: grid; gap: 26px; margin: 34px 0 0; padding: 0; list-style: none; counter-reset: lesson; }
.lessons li { counter-increment: lesson; padding-top: 16px; border-top: 1px solid var(--rule); }
.lessons h3 { display: flex; gap: 12px; font: 700 clamp(1.25rem, 3.4vw, 1.6rem)/1.1 var(--cond); letter-spacing: .03em; text-transform: uppercase; color: var(--paper); margin: 0 0 8px; }
.lessons h3::before { content: counter(lesson); font: 700 .9rem var(--type); color: var(--brass); margin-top: .25em; }
.lessons p { margin: 0; color: var(--cream-dim); }
.reflection { max-width: 50rem; }
.reflection p { font-size: clamp(1.1rem, 2.4vw, 1.3rem); color: var(--cream); }
.reflection .ask { margin: 26px 0; font: italic 500 clamp(1.9rem, 6.4vw, 3.2rem)/1.1 var(--serif); color: var(--brass); }

/* ---------- final CTA and footer ---------- */
.final-cta { text-align: center; padding: clamp(90px, 14vw, 170px) 0; background:
  radial-gradient(ellipse at 50% 40%, rgba(205, 167, 95, .12), transparent 60%), var(--night); }
.final-cta .wordmark { justify-content: center; font-size: clamp(2.8rem, 11vw, 5.4rem); }
.final-cta .ctas { justify-content: center; margin-top: 24px; }
.final-cta .hero-meta { text-align: center; }
footer { padding: 56px 0 72px; border-top: 1px solid var(--rule); font-size: .92rem; color: var(--cream-dim); }
footer h2 { font: 700 .95rem var(--cond); letter-spacing: .18em; text-transform: uppercase; color: var(--paper); margin: 0 0 12px; }
footer .cols { display: grid; gap: 30px; }
footer p { margin: 0 0 .8em; }
footer a { color: var(--paper); }
.fine { margin-top: 36px; font: 400 .76rem/1.5 var(--type); color: var(--cream-faint); }

/* ---------- loops ---------- */
.loopbox { position: relative; }
.loopbox video { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; background: var(--ink-2); }
.loopbox .loop-toggle { position: absolute; right: 10px; bottom: 10px; display: grid; place-items: center; width: 36px; height: 36px; border: 1px solid var(--rule); border-radius: 50%; background: rgba(11, 17, 23, .7); color: var(--paper); cursor: pointer; font-size: .8rem; }
.loop-flicker video { aspect-ratio: 976 / 300; }

/* ================================================================== wider screens */
@media (min-width: 720px) {
  .palette { grid-template-columns: repeat(4, 1fr); }
  .grid-2, .duo, .ba { grid-template-columns: 1fr 1fr; }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .roles { grid-template-columns: 1.1fr 1fr; }
  .facts { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: repeat(2, 1fr); gap: 34px 26px; }
  .counts { grid-template-columns: repeat(4, 1fr); }
  .wall-btns { grid-template-columns: repeat(4, 1fr); }
  .builders { grid-template-columns: 1fr 1fr; }
  .toolgroups { grid-template-columns: 1fr 1fr; }
  .snapshot { grid-template-columns: repeat(5, 1fr); }
  .snapshot div { padding-right: 16px; }
  .lessons { grid-template-columns: 1fr 1fr; gap: 34px 40px; }
  .timeline li { grid-template-columns: 150px 1fr; gap: 22px; padding-left: 28px; }
  .timeline .thumb { width: 150px; }
  footer .cols { grid-template-columns: 1.3fr 1fr 1fr; }
  .evo { grid-template-columns: repeat(2, 1fr); }
  .latch-grid { grid-template-columns: 1fr 1fr; align-items: start; }
}
@media (min-width: 1000px) {
  .nav-links { display: flex; }
  .steps { grid-template-columns: repeat(4, 1fr); }
  .steps .step.wide { grid-column: span 2; }
  .evo { grid-template-columns: repeat(4, 1fr); gap: 20px; }
  .casenotes { grid-template-columns: 1fr 1.25fr; gap: 56px; }
  .knocks { grid-template-columns: 1fr 1fr; gap: 48px; }
  .twomm { grid-template-columns: 1fr 2.2fr; gap: 48px; }
  .toolgroups { grid-template-columns: repeat(4, 1fr); }
  .ba.three { grid-template-columns: 1fr 1fr 1fr; }
  .split { display: grid; grid-template-columns: 1fr 1.1fr; gap: 64px; align-items: start; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .reveal { opacity: 1; transform: none; transition: none; }
  .hero-media video { display: none; }
}