:root {
  --bg: #0a0a0f;
  --bg-subtle: #12121a;
  --bg-card: #16161f;
  --fg: #e8e8ed;
  --fg-muted: #8b8b9e;
  --accent: #00e599;
  --accent-dim: #00e59933;
  --accent-glow: #00e59915;
  --code-bg: #0d0d14;
  --border: #1e1e2a;
  --red: #ff5f57;
  --yellow: #febc2e;
  --green: #28c840;
  --tag-color: #7eb8ff;
  --attr-color: #c89eff;
  --string-color: #00e599;
  --radius: 12px;
  --max-width: 1100px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: 'DM Sans', sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* ─── Hero ─── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px 60px;
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(ellipse 60% 50% at 50% 0%, var(--accent-glow) 0%, transparent 70%),
    var(--bg);
}

.hero-inner {
  max-width: var(--max-width);
  width: 100%;
}

.hero-badge {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--accent);
  background: var(--accent-dim);
  border: 1px solid var(--accent-dim);
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 32px;
}

.hero h1 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.accent {
  color: var(--accent);
}

.hero-sub {
  font-size: 1.15rem;
  color: var(--fg-muted);
  max-width: 560px;
  line-height: 1.7;
  margin-bottom: 48px;
}

.hero-code {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  max-width: 480px;
}

.code-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border);
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.dot.red { background: var(--red); }
.dot.yellow { background: var(--yellow); }
.dot.green { background: var(--green); }

.code-filename {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--fg-muted);
  margin-left: 8px;
}

.hero-code pre {
  padding: 20px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  line-height: 1.8;
  overflow-x: auto;
}

.hero-code code {
  color: var(--fg);
}

.tag { color: var(--tag-color); }
.attr { color: var(--attr-color); }
.string { color: var(--string-color); }

/* ─── Proof / Stats ─── */
.proof {
  padding: 80px 24px;
  background: var(--bg-subtle);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.proof-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-bottom: 40px;
}

.stat {
  text-align: center;
}

.stat-number {
  display: block;
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.02em;
  line-height: 1;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--fg-muted);
  line-height: 1.5;
}

.proof-note {
  text-align: center;
  font-size: 1.1rem;
  color: var(--fg-muted);
  font-style: italic;
  max-width: 600px;
  margin: 0 auto;
}

/* ─── Curriculum ─── */
.curriculum {
  padding: 100px 24px;
}

.curriculum-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}

.curriculum h2,
.difference h2 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 48px;
}

.module-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.module {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: border-color 0.2s;
}

.module:hover {
  border-color: var(--accent-dim);
}

.module-icon {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.4rem;
  color: var(--accent);
  margin-bottom: 16px;
  font-weight: 500;
}

.module h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.module p {
  color: var(--fg-muted);
  font-size: 0.95rem;
  margin-bottom: 20px;
  line-height: 1.6;
}

.module-topics {
  list-style: none;
  padding: 0;
}

.module-topics li {
  font-size: 0.85rem;
  color: var(--fg-muted);
  padding: 6px 0;
  border-top: 1px solid var(--border);
  font-family: 'JetBrains Mono', monospace;
}

.module-topics li::before {
  content: '>';
  color: var(--accent);
  margin-right: 8px;
}

/* ─── Difference ─── */
.difference {
  padding: 100px 24px;
  background: var(--bg-subtle);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.difference-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.diff-grid {
  display: grid;
  gap: 16px;
}

.diff-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 28px;
}

.diff-contrast {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.diff-them {
  color: var(--fg-muted);
  font-size: 0.9rem;
  text-decoration: line-through;
  text-decoration-color: var(--fg-muted);
}

.diff-us {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--fg);
}

/* ─── Closing ─── */
.closing {
  padding: 120px 24px;
  text-align: center;
  background:
    radial-gradient(ellipse 60% 40% at 50% 100%, var(--accent-glow) 0%, transparent 70%),
    var(--bg);
}

.closing-inner {
  max-width: 700px;
  margin: 0 auto;
}

.closing h2 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 24px;
}

.closing-text {
  color: var(--fg-muted);
  font-size: 1.1rem;
  line-height: 1.7;
}

/* ─── Footer ─── */
.site-footer {
  padding: 32px 24px;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer-brand {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  font-size: 0.9rem;
}

.footer-sep {
  color: var(--fg-muted);
  margin: 0 12px;
}

.footer-tagline {
  color: var(--fg-muted);
  font-size: 0.85rem;
}

/* ─── Responsive ─── */
@media (max-width: 768px) {
  .stat-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .module-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding: 60px 20px 40px;
  }

  .hero-code {
    max-width: 100%;
  }

  .curriculum,
  .difference {
    padding: 60px 20px;
  }

  .closing {
    padding: 80px 20px;
  }

  .proof {
    padding: 60px 20px;
  }
}