:root {
  --bg: #0d0f14;
  --surface: #161920;
  --surface-2: #1e222d;
  --fg: #e8e8e8;
  --fg-2: #a8a8b0;
  --fg-3: #6a6a78;
  --accent: #f5a623;
  --accent-dim: rgba(245, 166, 35, 0.12);
  --border: rgba(255,255,255,0.06);
  --font-display: 'DM Serif Display', Georgia, serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* NAV */
.nav {
  padding: 28px 48px;
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: baseline;
  gap: 20px;
}
.nav-logo {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg);
}
.nav-tagline {
  font-size: 13px;
  color: var(--fg-3);
  font-weight: 300;
}

/* HERO */
.hero {
  padding: 96px 48px 80px;
}
.hero-inner {
  max-width: 1100px;
  margin: 0 auto;
}
.hero-kicker {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 28px;
}
.hero-headline {
  font-family: var(--font-display);
  font-size: clamp(52px, 6vw, 88px);
  line-height: 1.05;
  font-weight: 400;
  color: var(--fg);
  margin-bottom: 28px;
  max-width: 700px;
}
.hero-headline em {
  font-style: italic;
  color: var(--accent);
}
.hero-sub {
  font-size: 17px;
  color: var(--fg-2);
  max-width: 580px;
  line-height: 1.7;
  margin-bottom: 56px;
  font-weight: 300;
}
.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  max-width: 760px;
}
.hero-stat {
  background: var(--surface);
  padding: 24px 28px;
}
.stat-number {
  display: block;
  font-family: var(--font-display);
  font-size: 36px;
  color: var(--accent);
  margin-bottom: 4px;
}
.stat-label {
  display: block;
  font-size: 12px;
  color: var(--fg-3);
  line-height: 1.4;
  font-weight: 400;
}

/* PROBLEM */
.problem {
  padding: 80px 48px;
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.problem-inner {
  max-width: 1100px;
  margin: 0 auto;
}
.problem-label, .system-label, .proof-label {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
}
.problem-headline {
  font-family: var(--font-display);
  font-size: clamp(36px, 4vw, 56px);
  color: var(--fg);
  margin-bottom: 28px;
  max-width: 560px;
  line-height: 1.15;
}
.problem-body {
  font-size: 16px;
  color: var(--fg-2);
  max-width: 580px;
  line-height: 1.7;
  margin-bottom: 16px;
  font-weight: 300;
}
.problem-rule {
  margin-top: 40px;
  max-width: 580px;
}
.rule-bar {
  height: 8px;
  background: var(--surface-2);
  border-radius: 4px;
  overflow: hidden;
}
.rule-fill.fast {
  width: 18.75%;
  height: 100%;
  background: var(--accent);
  border-radius: 4px;
}
.rule-labels {
  display: flex;
  justify-content: space-between;
  margin-top: 10px;
}
.rule-label {
  font-size: 12px;
  color: var(--fg-3);
}
.rule-label.fast { color: var(--accent); }

/* SYSTEM */
.system {
  padding: 96px 48px;
}
.system-inner {
  max-width: 1100px;
  margin: 0 auto;
}
.system-headline {
  font-family: var(--font-display);
  font-size: clamp(32px, 3.5vw, 48px);
  color: var(--fg);
  margin-bottom: 56px;
  max-width: 480px;
  line-height: 1.2;
}
.system-layers {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.layer {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 0 40px;
  padding: 40px 0;
  border-top: 1px solid var(--border);
}
.layer:last-child {
  border-bottom: 1px solid var(--border);
}
.layer-num {
  font-family: var(--font-display);
  font-size: 48px;
  color: var(--accent-dim);
  line-height: 1;
  padding-top: 4px;
  font-style: italic;
}
.layer-title {
  font-size: 18px;
  font-weight: 500;
  color: var(--fg);
  margin-bottom: 10px;
}
.layer-desc {
  font-size: 14px;
  color: var(--fg-2);
  line-height: 1.6;
  margin-bottom: 20px;
  font-weight: 300;
}
.layer-stack {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.layer-stack li {
  font-size: 11px;
  color: var(--fg-3);
  background: var(--surface-2);
  padding: 4px 10px;
  border-radius: 2px;
  letter-spacing: 0.03em;
}

/* PROOF */
.proof {
  padding: 80px 48px;
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.proof-inner {
  max-width: 1100px;
  margin: 0 auto;
}
.proof-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
}
.proof-card {
  background: var(--surface-2);
  padding: 32px 28px;
}
.proof-quote {
  font-size: 14px;
  color: var(--fg-2);
  line-height: 1.65;
  font-style: italic;
  margin-bottom: 20px;
  font-weight: 300;
}
.proof-meta {
  font-size: 11px;
  color: var(--fg-3);
  letter-spacing: 0.04em;
  margin-bottom: 10px;
}
.proof-result {
  font-size: 13px;
  color: var(--accent);
  font-weight: 500;
}

/* CLOSING */
.closing {
  padding: 96px 48px;
}
.closing-inner {
  max-width: 1100px;
  margin: 0 auto;
}
.closing-headline {
  font-family: var(--font-display);
  font-size: clamp(40px, 5vw, 72px);
  color: var(--fg);
  line-height: 1.1;
  margin-bottom: 36px;
}
.closing-headline em {
  font-style: italic;
  color: var(--accent);
}
.closing-body {
  font-size: 16px;
  color: var(--fg-2);
  max-width: 540px;
  line-height: 1.75;
  font-weight: 300;
}

/* FOOTER */
.footer {
  padding: 36px 48px;
  border-top: 1px solid var(--border);
}
.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 20px;
}
.footer-brand {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-3);
}
.footer-rule {
  font-size: 12px;
  color: var(--fg-3);
  font-weight: 300;
}

/* RESPONSIVE */
@media (max-width: 768px) {
  .nav, .hero, .problem, .system, .proof, .closing, .footer {
    padding-left: 24px;
    padding-right: 24px;
  }
  .hero-stats {
    grid-template-columns: 1fr;
  }
  .proof-cards {
    grid-template-columns: 1fr;
  }
  .layer {
    grid-template-columns: 1fr;
  }
  .layer-num {
    font-size: 32px;
    margin-bottom: 8px;
  }
}