/* Nav */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(10,10,15,0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--max-width); margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between; height: 64px;
}
.nav-logo { font-size: 1.3rem; font-weight: 800; letter-spacing: -0.02em; }
.nav-logo span { color: var(--accent-t); }
.nav-links { display: flex; gap: 28px; align-items: center; }
.nav-links a { color: var(--text-secondary); font-size: 0.9rem; font-weight: 500; }
.nav-links a:hover { color: var(--text-primary); text-decoration: none; }
.lang-select {
  background: var(--bg-card); border: 1px solid var(--border); color: var(--text-primary);
  padding: 6px 12px; border-radius: var(--radius-sm); font-size: 0.8rem; cursor: pointer;
}

/* Hero */
.hero {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  text-align: center; padding-top: 64px;
  background: radial-gradient(ellipse at 50% 30%, rgba(99,102,241,0.08) 0%, transparent 60%);
}
.hero-badge {
  display: inline-block; margin-bottom: 24px;
  padding: 6px 16px; border-radius: 20px;
  background: rgba(99,102,241,0.1); border: 1px solid rgba(99,102,241,0.2);
  color: var(--accent-u); font-size: 0.85rem; font-weight: 500;
}
.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem); font-weight: 800;
  line-height: 1.1; margin-bottom: 24px; letter-spacing: -0.03em;
}
.hero h1 .highlight {
  background: linear-gradient(135deg, var(--accent-t), var(--accent-u));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.hero-desc {
  font-size: 1.2rem; color: var(--text-secondary); max-width: 640px;
  margin: 0 auto 40px; line-height: 1.8;
}
.hero-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* TOAU animation */
.toau-stream {
  margin: 48px auto 0; max-width: 600px;
  display: flex; gap: 4px; justify-content: center; flex-wrap: wrap;
  font-family: var(--font-mono); font-size: 0.8rem;
}
.trit {
  width: 28px; height: 28px; display: flex; align-items: center; justify-content: center;
  border-radius: 4px; font-weight: 700; animation: tritPulse 3s ease-in-out infinite;
}
.trit-t { background: rgba(74,222,128,0.15); color: var(--accent-t); }
.trit-o { background: rgba(148,163,184,0.1); color: var(--accent-o); }
.trit-a { background: rgba(248,113,113,0.15); color: var(--accent-a); }
.trit-u { background: rgba(99,102,241,0.1); color: var(--accent-u); width: 12px; }
@keyframes tritPulse {
  0%, 100% { opacity: 0.7; } 50% { opacity: 1; }
}

/* Stats */
.stats { border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.stat-card {
  text-align: center; padding: 32px 16px;
}
.stat-number {
  font-size: 2.5rem; font-weight: 800;
  background: linear-gradient(135deg, var(--accent-gold), var(--accent-t));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.stat-label { color: var(--text-secondary); font-size: 0.9rem; margin-top: 8px; }

/* Layers */
.layer-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px; position: relative; overflow: hidden;
}
.layer-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
}
.layer-card.layer-t::before { background: var(--accent-t); }
.layer-card.layer-o::before { background: var(--accent-o); }
.layer-card.layer-a::before { background: var(--accent-a); }
.layer-card.layer-u::before { background: var(--accent-u); }
.layer-card h3 { font-size: 1.2rem; margin-bottom: 12px; }
.layer-card p { color: var(--text-secondary); font-size: 0.9rem; }
.layer-card pre { margin-top: 16px; font-size: 0.8rem; }

/* Code compare */
.code-compare {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
}
.code-compare-header {
  display: flex; border-bottom: 1px solid var(--border);
}
.code-compare-tab {
  flex: 1; padding: 12px 20px; text-align: center;
  font-size: 0.85rem; font-weight: 600; cursor: pointer;
  background: transparent; border: none; color: var(--text-secondary);
  border-bottom: 2px solid transparent;
}
.code-compare-tab.active { color: var(--accent-t); border-bottom-color: var(--accent-t); }
.code-compare-body { display: grid; grid-template-columns: 1fr 1fr; }
.code-compare-body > div { padding: 20px; }
.code-compare-body > div:first-child { border-right: 1px solid var(--border); }
.code-label {
  font-size: 0.75rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.1em; margin-bottom: 12px;
}
.code-label.hanseon { color: var(--accent-t); }
.code-label.other { color: var(--accent-o); }

/* Features */
.feature-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px;
  transition: border-color 0.2s;
}
.feature-card:hover { border-color: var(--accent-u); }
.feature-icon { font-size: 2rem; margin-bottom: 16px; }
.feature-card h3 { font-size: 1.1rem; margin-bottom: 8px; }
.feature-card p { color: var(--text-secondary); font-size: 0.85rem; }

/* CTA */
.cta {
  text-align: center;
  background: linear-gradient(180deg, transparent, rgba(99,102,241,0.05));
}

/* Footer */
.footer {
  border-top: 1px solid var(--border); padding: 40px 0;
  text-align: center; color: var(--text-muted); font-size: 0.85rem;
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .code-compare-body { grid-template-columns: 1fr; }
  .code-compare-body > div:first-child { border-right: none; border-bottom: 1px solid var(--border); }
  .hero h1 { font-size: 2rem; }
  .stat-number { font-size: 1.8rem; }
}