/* ============================================================
   ULTRAFAST × CEREBRAS — design system
   Dark silicon, electric cyan, molten amber. Speed as a texture.
   ============================================================ */
:root {
  --bg: #06080f;
  --bg-2: #0a0f1c;
  --panel: #0d1424;
  --panel-2: #111a30;
  --line: rgba(120, 160, 220, 0.14);
  --text: #e8eefc;
  --text-dim: #93a3c4;
  --cyan: #00e5ff;
  --cyan-dim: rgba(0, 229, 255, 0.14);
  --amber: #ffb347;
  --green: #76b900;
  --red: #ff5a6e;
  --font-display: "Space Grotesk", system-ui, sans-serif;
  --font-body: "Inter", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  --radius: 16px;
  --nav-h: 60px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
.mono { font-family: var(--font-mono); }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.hidden { display: none !important; }
a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }
kbd {
  font-family: var(--font-mono); font-size: 0.78em;
  background: var(--panel-2); border: 1px solid var(--line);
  border-bottom-width: 2px; border-radius: 6px; padding: 1px 7px;
}
::selection { background: rgba(0, 229, 255, 0.3); }

/* ---------- progress bar ---------- */
#progressBar {
  position: fixed; top: 0; left: 0; height: 3px; width: 0%;
  background: linear-gradient(90deg, var(--cyan), var(--amber));
  z-index: 200; box-shadow: 0 0 12px rgba(0, 229, 255, 0.7);
}

/* ---------- top nav ---------- */
#topnav {
  position: fixed; top: 0; left: 0; right: 0; height: var(--nav-h);
  display: flex; align-items: center; gap: 24px;
  padding: 0 clamp(16px, 4vw, 40px);
  background: rgba(6, 8, 15, 0.78);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
  z-index: 100;
}
.brand {
  display: flex; align-items: center; gap: 9px;
  font-family: var(--font-display); font-weight: 700; font-size: 14px;
  letter-spacing: 0.08em; color: var(--text); white-space: nowrap;
}
.brand:hover { text-decoration: none; }
.brand-x { color: var(--cyan); margin: 0 2px; }
#topnav nav { display: flex; gap: 4px; margin-left: auto; }
#topnav nav a {
  color: var(--text-dim); font-size: 13px; font-weight: 500;
  padding: 6px 11px; border-radius: 8px; transition: color .2s, background .2s;
}
#topnav nav a:hover { color: var(--text); background: rgba(255,255,255,.05); text-decoration: none; }
#topnav nav a.active { color: var(--cyan); background: var(--cyan-dim); }
.nav-score {
  display: flex; align-items: center; gap: 6px;
  font-family: var(--font-mono); font-size: 13px; font-weight: 700;
  color: var(--amber); background: rgba(255, 179, 71, 0.1);
  border: 1px solid rgba(255, 179, 71, 0.3);
  padding: 5px 12px; border-radius: 99px;
}
.nav-score.bump { animation: bump .4s ease; }
@keyframes bump { 40% { transform: scale(1.18); } }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-display); font-weight: 600; font-size: 15px;
  padding: 13px 26px; border-radius: 12px; border: 0; cursor: pointer;
  transition: transform .15s ease, box-shadow .2s, background .2s;
  color: var(--text); text-decoration: none;
}
.btn:hover { text-decoration: none; transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn-primary {
  background: linear-gradient(135deg, #00c8e0, #0088ff);
  color: #02131a; box-shadow: 0 6px 24px rgba(0, 200, 255, 0.35);
}
.btn-primary:hover { box-shadow: 0 10px 32px rgba(0, 200, 255, 0.5); }
.btn-primary:disabled { opacity: .45; cursor: not-allowed; transform: none; }
.btn-ghost {
  background: rgba(255,255,255,.05); border: 1px solid var(--line);
}
.btn-ghost:hover { background: rgba(255,255,255,.1); }
.btn-ghost:disabled { opacity: .4; cursor: not-allowed; transform: none; }

/* ---------- hero ---------- */
.hero {
  position: relative; min-height: 100svh;
  display: flex; flex-direction: column; justify-content: center;
  padding: calc(var(--nav-h) + 40px) clamp(16px, 6vw, 80px) 80px;
  overflow: hidden;
}
#heroCanvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-inner { position: relative; max-width: 880px; }
.kicker {
  font-family: var(--font-mono); font-size: 12.5px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--cyan); margin-bottom: 18px;
}
.hero h1 {
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(42px, 7.5vw, 88px); line-height: 1.02;
  letter-spacing: -0.02em; margin-bottom: 26px;
}
.hero h1 em, .section-head h2 em {
  font-style: normal;
  background: linear-gradient(100deg, var(--cyan) 10%, #7ab8ff 55%, var(--amber) 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lede { font-size: clamp(16px, 2vw, 20px); color: var(--text-dim); max-width: 640px; margin-bottom: 34px; }
.lede strong { color: var(--text); }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 40px; }
.hero-chips { display: flex; gap: 10px; flex-wrap: wrap; }
.chip {
  font-family: var(--font-mono); font-size: 13px; color: var(--text-dim);
  border: 1px solid var(--line); border-radius: 99px; padding: 7px 15px;
  background: rgba(13, 20, 36, 0.6); backdrop-filter: blur(6px);
}
.chip b { color: var(--cyan); margin-right: 4px; }
.scroll-hint {
  position: absolute; bottom: 26px; left: 50%; transform: translateX(-50%);
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .3em;
  color: var(--text-dim); text-transform: uppercase;
  display: flex; flex-direction: column; align-items: center; gap: 8px;
}
.scroll-hint span {
  width: 1px; height: 42px;
  background: linear-gradient(var(--cyan), transparent);
  animation: drip 1.6s ease-in-out infinite;
}
@keyframes drip { 0% { transform: scaleY(0); transform-origin: top; } 55% { transform: scaleY(1); transform-origin: top; } 56% { transform-origin: bottom; } 100% { transform: scaleY(0); transform-origin: bottom; } }

/* ---------- sections ---------- */
.section { padding: clamp(70px, 10vw, 130px) clamp(16px, 6vw, 80px); max-width: 1240px; margin: 0 auto; }
.section-head { max-width: 780px; margin-bottom: clamp(36px, 5vw, 60px); }
.section-head h2 {
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(30px, 4.6vw, 52px); line-height: 1.08;
  letter-spacing: -0.015em; margin-bottom: 16px;
}
.sub { color: var(--text-dim); font-size: clamp(15px, 1.6vw, 17.5px); }
.sub strong { color: var(--text); }

/* reveal on scroll */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s cubic-bezier(.2,.7,.2,1); }
.reveal.in { opacity: 1; transform: none; }

/* ---------- race ---------- */
.race-panel {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: clamp(18px, 3vw, 32px);
}
.race-controls { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 24px; }
.race-toggle { display: flex; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; margin-left: auto; }
.toggle {
  background: transparent; border: 0; color: var(--text-dim); cursor: pointer;
  font-family: var(--font-display); font-weight: 600; font-size: 13.5px;
  padding: 10px 16px; display: flex; flex-direction: column; align-items: center; line-height: 1.25;
  transition: background .2s, color .2s;
}
.toggle span { font-family: var(--font-mono); font-size: 10.5px; font-weight: 400; opacity: .75; }
.toggle.on { background: var(--cyan-dim); color: var(--cyan); }
.lanes { display: grid; gap: 18px; }
.lane {
  background: var(--bg-2); border: 1px solid var(--line);
  border-radius: 12px; padding: 16px 18px;
}
.lane-ultra { border-color: rgba(0, 229, 255, 0.35); box-shadow: 0 0 30px rgba(0, 229, 255, 0.07) inset; }
.lane-head { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; flex-wrap: wrap; margin-bottom: 10px; }
.lane-tag { font-family: var(--font-display); font-weight: 600; font-size: 14px; }
.lane-ultra .lane-tag { color: var(--cyan); }
.lane-rate { font-family: var(--font-mono); font-size: 12.5px; color: var(--text-dim); }
.lane-track {
  position: relative; height: 8px; border-radius: 99px;
  background: rgba(255,255,255,.06); overflow: hidden; margin-bottom: 12px;
}
.lane-fill { height: 100%; width: 0%; border-radius: 99px; transition: width .12s linear; }
.lane-ultra .lane-fill { background: linear-gradient(90deg, var(--cyan), #7ab8ff); box-shadow: 0 0 14px rgba(0,229,255,.8); }
.lane-std .lane-fill { background: linear-gradient(90deg, #6b7a99, #93a3c4); }
.lane-pct {
  position: absolute; right: 8px; top: 50%; transform: translateY(-50%);
  font-family: var(--font-mono); font-size: 9.5px; color: var(--bg); font-weight: 700;
  mix-blend-mode: plus-lighter; color: var(--text); opacity: .8;
}
.lane-stream {
  min-height: 96px; max-height: 150px; overflow: hidden;
  font-size: 12.5px; line-height: 1.55; color: var(--text-dim);
  word-break: break-word; white-space: pre-wrap;
  mask-image: linear-gradient(#000 78%, transparent);
  -webkit-mask-image: linear-gradient(#000 78%, transparent);
}
.lane-stream .tok-new { color: var(--text); animation: tokIn .25s ease; }
@keyframes tokIn { from { opacity: 0; background: rgba(0,229,255,.35); } }
.lane-foot { display: flex; justify-content: space-between; align-items: center; margin-top: 10px; font-family: var(--font-mono); font-size: 12px; color: var(--text-dim); }
.lane-badge {
  background: var(--cyan-dim); color: var(--cyan); font-weight: 700;
  padding: 3px 10px; border-radius: 99px; font-size: 11px; letter-spacing: .08em;
}
.lane-badge.dim { background: rgba(255,255,255,.06); color: var(--text-dim); }
.race-award {
  display: flex; gap: 14px; align-items: center;
  margin-top: 20px; padding: 16px 20px;
  background: rgba(255, 179, 71, 0.08); border: 1px solid rgba(255, 179, 71, 0.35);
  border-radius: 12px; animation: awardIn .5s cubic-bezier(.2,.9,.3,1.4);
}
@keyframes awardIn { from { transform: scale(.92); opacity: 0; } }
.award-bolt { font-size: 28px; }
.race-award strong { color: var(--amber); }

.tradeoff {
  display: grid; grid-template-columns: 1fr auto 1fr; gap: 20px; align-items: stretch;
  margin-top: 28px;
}
.tradeoff-old, .tradeoff-new {
  border-radius: var(--radius); padding: 22px 24px; font-size: 15px;
}
.tradeoff-old { background: var(--panel); border: 1px solid var(--line); color: var(--text-dim); }
.tradeoff-old strong { color: var(--text); }
.tradeoff-new {
  background: linear-gradient(135deg, rgba(0,229,255,.1), rgba(0,136,255,.06));
  border: 1px solid rgba(0,229,255,.35);
}
.tradeoff-new strong, .tradeoff-new em { color: var(--cyan); }
.tradeoff-label {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .18em;
  text-transform: uppercase; margin-bottom: 8px; color: var(--text-dim);
}
.tradeoff-new .tradeoff-label { color: var(--cyan); }
.tradeoff-arrow { align-self: center; font-size: 30px; color: var(--cyan); }

/* ---------- stats ---------- */
.stat-grid {
  display: grid; gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}
.stat-card {
  position: relative; background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 26px 24px;
  overflow: hidden; transition: transform .25s ease, border-color .25s, box-shadow .25s;
}
.stat-card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 2px;
  background: linear-gradient(90deg, var(--cyan), transparent);
  opacity: 0; transition: opacity .3s;
}
.stat-card:hover { transform: translateY(-4px); border-color: rgba(0,229,255,.4); box-shadow: 0 14px 40px rgba(0, 150, 255, 0.12); }
.stat-card:hover::before { opacity: 1; }
.stat-card.counted { border-color: rgba(0,229,255,.3); }
.stat-value {
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(30px, 3.2vw, 42px); line-height: 1; margin-bottom: 10px;
  display: flex; align-items: baseline; gap: 6px; font-variant-numeric: tabular-nums;
  flex-wrap: wrap;
}
.stat-value .unit { font-size: .42em; color: var(--cyan); font-weight: 600; letter-spacing: .02em; }
.stat-card h3 { font-family: var(--font-display); font-size: 16px; margin-bottom: 6px; }
.stat-card p { font-size: 13.5px; color: var(--text-dim); }
.stat-card .stat-value .count { max-width: 100%; overflow-wrap: break-word; }
.stat-card .spark {
  position: absolute; top: 14px; right: 16px; font-size: 12px;
  color: var(--amber); font-family: var(--font-mono); font-weight: 700;
  opacity: 0; transform: translateY(6px); transition: all .4s ease .3s;
}
.stat-card.counted .spark { opacity: 1; transform: none; }

/* ---------- wafer ---------- */
.wafer-stage { max-width: 960px; margin: 0 auto; }
.wafer-scene {
  position: relative; border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--line); background: var(--bg-2);
  outline: none; touch-action: pan-y;
}
.wafer-scene:focus-visible { border-color: var(--cyan); box-shadow: 0 0 0 3px rgba(0,229,255,.25); }
#waferSvg { display: block; width: 100%; height: auto; }
.svg-wafer-title { fill: var(--text); font-family: var(--font-display); font-weight: 700; font-size: 34px; letter-spacing: .12em; }
.svg-wafer-sub { fill: var(--text-dim); font-family: var(--font-mono); font-size: 12px; }
.svg-gpu-label { fill: var(--green); font-family: var(--font-mono); font-weight: 700; font-size: 13px; }
.wafer-handle {
  position: absolute; top: 50%; transform: translate(-50%, -50%);
  width: 44px; height: 44px; border-radius: 50%;
  background: rgba(6, 10, 20, 0.85); border: 2px solid var(--cyan);
  display: flex; align-items: center; justify-content: center;
  color: var(--cyan); font-size: 18px; pointer-events: none;
  box-shadow: 0 0 20px rgba(0,229,255,.5); left: 50%;
}
.wafer-tag {
  position: absolute; font-family: var(--font-mono); font-size: 10.5px;
  letter-spacing: .1em; padding: 5px 10px; border-radius: 6px;
  background: rgba(6, 10, 20, 0.8); border: 1px solid var(--line);
  pointer-events: none;
}
.tag-wafer { bottom: 14px; right: 14px; color: var(--cyan); }
.tag-gpu { bottom: 14px; left: 14px; color: var(--green); }
#waferRange {
  width: 100%; margin-top: 18px; appearance: none; -webkit-appearance: none;
  height: 6px; border-radius: 99px; background: rgba(255,255,255,.1);
  cursor: pointer;
}
#waferRange::-webkit-slider-thumb {
  appearance: none; -webkit-appearance: none; width: 22px; height: 22px; border-radius: 50%;
  background: var(--cyan); border: 3px solid #06222b; box-shadow: 0 0 14px rgba(0,229,255,.7);
}
#waferRange::-moz-range-thumb {
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--cyan); border: 3px solid #06222b; box-shadow: 0 0 14px rgba(0,229,255,.7);
}
.wafer-facts { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 26px; }
.wf {
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px;
  padding: 16px; text-align: center;
}
.wf b {
  display: block; font-family: var(--font-display); font-size: 26px;
  color: var(--cyan); margin-bottom: 4px;
}
.wf span { font-size: 12px; color: var(--text-dim); line-height: 1.4; display: block; }
.wafer-note { margin-top: 18px; font-size: 13.5px; color: var(--text-dim); text-align: center; }

/* ---------- anatomy ---------- */
.anatomy-wrap { position: relative; }
.anatomy-sticky {
  position: sticky; top: calc(var(--nav-h) + 16px);
  display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: clamp(20px, 4vw, 56px); align-items: center;
  min-height: min(72vh, 640px);
}
.anatomy-visual {
  position: relative; background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 20px; overflow: hidden;
}
#anatomySvg { display: block; width: 100%; height: auto; }
.anatomy-meter {
  position: absolute; top: 14px; left: 16px; font-size: 11.5px;
  color: var(--cyan); background: rgba(6,10,20,.8);
  padding: 4px 10px; border-radius: 6px; border: 1px solid var(--line);
}
.anatomy-caption { min-height: 220px; }
.an-step-kicker {
  font-family: var(--font-mono); font-size: 11.5px; letter-spacing: .16em;
  text-transform: uppercase; color: var(--cyan); margin-bottom: 10px;
}
.anatomy-caption h3 {
  font-family: var(--font-display); font-size: clamp(22px, 2.6vw, 32px);
  margin-bottom: 12px; line-height: 1.15;
}
.anatomy-caption p { color: var(--text-dim); font-size: 15px; }
.anatomy-caption.swap h3, .anatomy-caption.swap p { animation: capIn .45s ease; }
@keyframes capIn { from { opacity: 0; transform: translateY(12px); } }
.an-dots { display: flex; gap: 8px; margin-top: 22px; }
.an-dot {
  width: 34px; height: 5px; border-radius: 99px; border: 0; cursor: pointer;
  background: rgba(255,255,255,.14); transition: background .3s;
}
.an-dot.on { background: var(--cyan); box-shadow: 0 0 10px rgba(0,229,255,.6); }
.anatomy-spacer { height: 520vh; }

/* ---------- token catch ---------- */
.catch-layout {
  display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: clamp(18px, 3vw, 32px); align-items: start;
}
.catch-stage-wrap {
  position: relative; border-radius: var(--radius); overflow: hidden;
  border: 1px solid rgba(0,229,255,.3); background: var(--bg-2);
}
#catchCanvas { display: block; width: 100%; height: auto; touch-action: none; cursor: crosshair; }
.catch-overlay {
  position: absolute; inset: 0; z-index: 5;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 14px; text-align: center; padding: 28px;
  background: rgba(4, 7, 14, 0.88); backdrop-filter: blur(6px);
}
.catch-overlay h3 { font-family: var(--font-display); font-size: 30px; }
.catch-overlay p { color: var(--text-dim); font-size: 14px; max-width: 400px; }
.catch-overlay strong { color: var(--cyan); }
.catch-keys { font-size: 12.5px; }
.catch-hud {
  position: absolute; top: 0; left: 0; right: 0; z-index: 4;
  display: flex; justify-content: space-between; gap: 10px;
  padding: 10px 14px; font-family: var(--font-mono); font-size: 12px;
  color: var(--text); background: linear-gradient(rgba(4,7,14,.85), transparent);
  pointer-events: none;
}
#catchLives { color: var(--red); letter-spacing: 2px; }
.scenario-cards { display: grid; gap: 12px; }
.scenario-card {
  position: relative; background: var(--panel); border: 1px solid var(--line);
  border-radius: 14px; padding: 18px 20px; transition: border-color .3s, box-shadow .3s, transform .3s;
}
.scenario-card .sc-lock {
  position: absolute; top: 14px; right: 16px; font-size: 15px;
  filter: grayscale(1); opacity: .7;
}
.scenario-card.locked .sc-body, .scenario-card.locked .sc-why {
  filter: blur(5px); user-select: none; pointer-events: none;
}
.scenario-card.locked { opacity: .75; }
.scenario-card.unlocked {
  border-color: rgba(0,229,255,.45);
  box-shadow: 0 0 26px rgba(0,229,255,.1);
  animation: cardIn .55s cubic-bezier(.2,.9,.3,1.3);
}
.scenario-card.unlocked .sc-lock { filter: none; opacity: 1; }
@keyframes cardIn { 0% { transform: scale(.96); } 55% { transform: scale(1.02); } }
.scenario-card.active-target { border-color: var(--amber); box-shadow: 0 0 22px rgba(255,179,71,.18); }
.sc-num {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .16em;
  text-transform: uppercase; color: var(--cyan); margin-bottom: 5px;
}
.scenario-card h3 { font-family: var(--font-display); font-size: 17px; margin-bottom: 6px; }
.sc-body { font-size: 13.5px; color: var(--text-dim); margin-bottom: 8px; }
.sc-why { font-size: 12.5px; color: var(--amber); }
.sc-why em { color: var(--amber); }

/* ---------- voices ---------- */
.quote-card {
  background: linear-gradient(135deg, var(--panel-2), var(--panel));
  border: 1px solid var(--line); border-left: 4px solid var(--cyan);
  border-radius: var(--radius); padding: clamp(24px, 4vw, 44px);
  margin-bottom: 26px;
}
.quote-card blockquote {
  font-family: var(--font-display); font-size: clamp(19px, 2.4vw, 27px);
  line-height: 1.4; margin-bottom: 16px; letter-spacing: -0.01em;
}
.quote-card cite { font-style: normal; font-family: var(--font-mono); font-size: 13px; color: var(--cyan); }
.logo-row { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 26px; }
.logo-pill {
  font-family: var(--font-display); font-weight: 600; font-size: 15px;
  padding: 10px 22px; border-radius: 99px;
  border: 1px solid var(--line); background: var(--panel);
  transition: transform .2s, border-color .2s, color .2s;
}
.logo-pill:hover { transform: translateY(-3px); border-color: var(--cyan); color: var(--cyan); }
.internal-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.internal-card {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 24px;
}
.internal-card h3 { font-family: var(--font-display); font-size: 17px; margin-bottom: 8px; }
.internal-card p { font-size: 14px; color: var(--text-dim); }

/* ---------- quiz ---------- */
.quiz-panel {
  max-width: 720px; margin: 0 auto;
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: clamp(22px, 4vw, 40px);
}
.quiz-start { text-align: center; display: grid; gap: 16px; justify-items: center; }
.quiz-bolt { font-size: 44px; animation: boltPulse 1.8s ease-in-out infinite; }
@keyframes boltPulse { 50% { transform: scale(1.15); filter: drop-shadow(0 0 14px rgba(0,229,255,.8)); } }
.quiz-start p { color: var(--text-dim); max-width: 420px; }
.quiz-top { display: flex; justify-content: space-between; font-family: var(--font-mono); font-size: 12.5px; color: var(--text-dim); margin-bottom: 10px; }
.quiz-streak { color: var(--amber); font-weight: 700; }
.quiz-bar { height: 5px; border-radius: 99px; background: rgba(255,255,255,.08); overflow: hidden; margin-bottom: 24px; }
#quizBarFill { height: 100%; width: 0%; background: linear-gradient(90deg, var(--cyan), var(--amber)); transition: width .4s ease; }
#quizQuestion { font-family: var(--font-display); font-size: clamp(19px, 2.4vw, 25px); line-height: 1.3; margin-bottom: 22px; }
.quiz-options { display: grid; gap: 10px; margin-bottom: 16px; }
.quiz-opt {
  text-align: left; font-family: var(--font-body); font-size: 15px;
  background: var(--bg-2); color: var(--text);
  border: 1px solid var(--line); border-radius: 12px;
  padding: 14px 18px; cursor: pointer;
  transition: border-color .2s, background .2s, transform .15s;
}
.quiz-opt:hover:not(:disabled) { border-color: var(--cyan); background: var(--cyan-dim); transform: translateX(4px); }
.quiz-opt:disabled { cursor: default; }
.quiz-opt.correct { border-color: #3ddc84; background: rgba(61, 220, 132, 0.12); }
.quiz-opt.wrong { border-color: var(--red); background: rgba(255, 90, 110, 0.1); animation: shake .35s ease; }
@keyframes shake { 25% { transform: translateX(-6px); } 75% { transform: translateX(6px); } }
.quiz-explain { font-size: 13.5px; color: var(--text-dim); min-height: 22px; margin-bottom: 14px; }
.quiz-explain.good { color: #3ddc84; }
.quiz-explain.bad { color: var(--red); }
.quiz-done { text-align: center; display: grid; gap: 14px; justify-items: center; }
.quiz-done h3 { font-family: var(--font-display); font-size: 28px; }
.quiz-done p { color: var(--text-dim); max-width: 440px; }

/* ---------- final ---------- */
.section-final { max-width: 900px; }
.final-card {
  text-align: center; background:
    radial-gradient(600px 300px at 50% -10%, rgba(0,229,255,.12), transparent),
    var(--panel);
  border: 1px solid rgba(0,229,255,.3);
  border-radius: 24px; padding: clamp(32px, 6vw, 64px);
}
.final-card h2 { font-family: var(--font-display); font-size: clamp(30px, 4.5vw, 48px); margin-bottom: 16px; }
.final-card > p { color: var(--text-dim); max-width: 560px; margin: 0 auto 28px; }
.final-card strong { color: var(--text); }
.notify-form { display: flex; gap: 10px; max-width: 460px; margin: 0 auto 14px; }
.notify-form input {
  flex: 1; min-width: 0; background: var(--bg-2); border: 1px solid var(--line);
  border-radius: 12px; padding: 13px 18px; color: var(--text);
  font-family: var(--font-body); font-size: 15px; outline: none;
  transition: border-color .2s, box-shadow .2s;
}
.notify-form input:focus { border-color: var(--cyan); box-shadow: 0 0 0 3px rgba(0,229,255,.18); }
.notify-form.sent input { border-color: #3ddc84; }
.notify-note { font-size: 12.5px; color: var(--text-dim); }
.footer { margin-top: 48px; text-align: center; font-size: 12.5px; color: var(--text-dim); display: grid; gap: 8px; }
#finalScoreLine { color: var(--amber); font-weight: 700; }

/* ---------- toasts ---------- */
#toastLayer {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  z-index: 300; pointer-events: none; width: min(92vw, 480px);
}
.toast {
  font-family: var(--font-mono); font-size: 13px; font-weight: 700;
  background: rgba(10, 16, 30, 0.92); border: 1px solid rgba(255,179,71,.5);
  color: var(--amber); padding: 10px 20px; border-radius: 99px;
  box-shadow: 0 8px 30px rgba(0,0,0,.5);
  animation: toastIn .35s cubic-bezier(.2,.9,.3,1.4), toastOut .4s ease 2.4s forwards;
}
.toast.cyan { border-color: rgba(0,229,255,.5); color: var(--cyan); }
@keyframes toastIn { from { transform: translateY(20px) scale(.9); opacity: 0; } }
@keyframes toastOut { to { transform: translateY(14px); opacity: 0; } }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  #topnav nav { display: none; }
  .anatomy-sticky { grid-template-columns: 1fr; min-height: 0; gap: 18px; }
  .anatomy-caption { min-height: 0; }
  .catch-layout { grid-template-columns: 1fr; }
  .internal-grid { grid-template-columns: 1fr; }
  .tradeoff { grid-template-columns: 1fr; }
  .tradeoff-arrow { transform: rotate(90deg); justify-self: center; }
  .wafer-facts { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 520px) {
  .hero { padding-bottom: 60px; }
  .hero-cta .btn { width: 100%; justify-content: center; }
  .race-toggle { margin-left: 0; width: 100%; }
  .toggle { flex: 1; }
  .notify-form { flex-direction: column; }
  .lane-stream { max-height: 120px; }
  .wafer-tag { font-size: 9px; }
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .scroll-hint span, .quiz-bolt { animation: none; }
  .lane-stream .tok-new { animation: none; }
}