:root {
  --bg: #0a0e1a;
  --bg-card: #111827;
  --bg-card-hover: #1a2236;
  --bg-surface: #0d1220;
  --text: #f0f2f5;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #3b82f6;
  --accent-hover: #60a5fa;
  --accent-subtle: rgba(59, 130, 246, 0.1);
  --border: #1e293b;
  --border-hover: #334155;
  --success: #10b981;
  --warning: #f59e0b;
  --radius: 8px;
  --radius-lg: 12px;
  --max-width: 1120px;
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; transition: color 0.2s ease; }
a:hover { color: var(--accent-hover); }

/* HEADER */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 14, 26, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
  height: 64px;
}

.logo {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}

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

.nav-links {
  display: flex;
  gap: 0.25rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.5rem 0.85rem;
  border-radius: 6px;
  transition: all 0.2s ease;
}

.nav-links a:hover {
  color: var(--text);
  background: var(--accent-subtle);
}

.nav-links a.active {
  color: var(--accent);
  background: var(--accent-subtle);
}

/* HERO */
.hero {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 5rem 2rem 3rem;
}

.hero h1 {
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
  background: linear-gradient(135deg, var(--text) 0%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 640px;
  line-height: 1.7;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  background: var(--accent-subtle);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 1.5rem;
}

.hero-badge .dot {
  width: 6px;
  height: 6px;
  background: var(--success);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* INDEX GRID */
.index-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.25rem;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem 4rem;
}

.index-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
}

.index-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
  opacity: 0;
  transition: opacity 0.25s ease;
}

.index-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.index-card:hover::before { opacity: 1; }

.index-card .card-icon {
  width: 40px;
  height: 40px;
  background: var(--accent-subtle);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  margin-bottom: 1rem;
}

.index-card h2 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}

.index-card h2 a {
  color: var(--text);
  transition: color 0.2s ease;
}

.index-card h2 a:hover { color: var(--accent); }

.index-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.index-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-top: 1rem;
  padding: 0.3rem 0.75rem;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.2);
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--success);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge::before {
  content: '';
  width: 5px;
  height: 5px;
  background: var(--success);
  border-radius: 50%;
}

/* CONTENT SECTIONS */
.content-section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2.5rem 2rem;
}

.content-section h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.content-section p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1rem;
  max-width: 720px;
}

/* SECTION DIVIDER */
.section-label {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

/* ABOUT SECTION */
.about {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 2rem 4rem;
  border-top: 1px solid var(--border);
}

.about h2 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.about p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1rem;
  max-width: 680px;
}

/* STATS ROW */
.stats-row {
  display: flex;
  gap: 2rem;
  margin-top: 2rem;
  flex-wrap: wrap;
}

.stat-item {
  text-align: center;
}

.stat-value {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text);
  font-family: var(--font-mono);
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* FOOTER */
footer {
  border-top: 1px solid var(--border);
  padding: 2rem;
  margin-top: 2rem;
}

footer > div, footer {
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

footer p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

footer nav {
  display: flex;
  gap: 1.5rem;
}

footer nav a {
  font-size: 0.8rem;
  color: var(--text-muted);
  transition: color 0.2s ease;
}

footer nav a:hover { color: var(--text); }

/* RESPONSIVE */
@media (max-width: 768px) {
  .hero { padding: 3rem 1.5rem 2rem; }
  .hero h1 { font-size: 2rem; }
  .subtitle { font-size: 1rem; }
  .index-grid { grid-template-columns: 1fr; padding: 0 1.5rem 3rem; gap: 1rem; }
  .nav-container { padding: 0 1.5rem; }
  .nav-links { gap: 0; }
  .nav-links a { font-size: 0.78rem; padding: 0.4rem 0.6rem; }
  .content-section { padding: 2rem 1.5rem; }
  .about { padding: 2rem 1.5rem 3rem; }
  footer { padding: 1.5rem; }
  .stats-row { gap: 1.5rem; }
  .section-label { padding: 0 1.5rem; }
}