/* ============ TerranHuman — Global Styles ============ */
:root {
  --bg: #0a0a1a;
  --bg-alt: #12122a;
  --surface: #1a1a3a;
  --surface-hover: #252550;
  --text: #e8e8f0;
  --text-muted: #8888aa;
  --accent: #4f8cff;
  --accent-glow: rgba(79, 140, 255, 0.15);
  --border: #2a2a4a;
  --success: #4ade80;
  --warning: #fbbf24;
  --error: #f87171;
  --font: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
}

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: #6a9cff; }

/* ============ Header ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 26, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 18px;
  color: var(--text);
}

.logo svg { flex-shrink: 0; }

.nav {
  display: flex;
  gap: 24px;
}

.nav a {
  color: var(--text-muted);
  font-size: 14px;
  transition: color 0.2s;
}
.nav a:hover { color: var(--text); }

/* ============ Hero ============ */
.hero {
  padding: 100px 0 80px;
  text-align: center;
  background: radial-gradient(ellipse at center bottom, var(--bg-alt) 0%, var(--bg) 70%);
}

.hero-content h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  line-height: 1.2;
}

.hero-content p {
  color: var(--text-muted);
  font-size: 1.15rem;
  max-width: 640px;
  margin: 0 auto 24px;
}

.subtitle {
  color: var(--text-muted);
  font-size: 1rem;
  max-width: 560px;
  margin: 0 auto 32px;
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ============ Buttons ============ */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 15px;
  transition: all 0.2s;
  cursor: pointer;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg);
}
.btn-primary:hover {
  background: #6a9cff;
  transform: translateY(-1px);
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ============ Concept Cards ============ */
.concept {
  padding: 80px 0;
  background: var(--bg-alt);
}

.concept-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.concept-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  transition: all 0.2s;
}
.concept-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.concept-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.concept-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.concept-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* ============ Who We Are ============ */
.who-we-are {
  padding: 80px 0;
}

.who-we-are .two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.who-we-are h2 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 800;
  margin-bottom: 20px;
  line-height: 1.3;
}

.who-we-are p {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 16px;
  line-height: 1.8;
}

.who-we-are-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  text-align: center;
}

.stat {
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--accent);
}

.stat-label {
  color: var(--text-muted);
  font-size: 14px;
  margin-top: 6px;
}

/* ============ Footer ============ */
.site-footer {
  padding: 40px 0;
  text-align: center;
  border-top: 1px solid var(--border);
}

.site-footer p {
  color: var(--text-muted);
  font-size: 14px;
}

.footer-links {
  margin-top: 8px;
}

.footer-links a {
  color: var(--text-muted);
}
.footer-links a:hover {
  color: var(--accent);
}

/* ============ Responsive ============ */
@media (max-width: 768px) {
  .site-header .container {
    flex-wrap: wrap;
    height: auto;
    padding: 0 16px;
    gap: 12px;
  }

  .nav {
    width: 100%;
    justify-content: center;
    padding-top: 12px;
    border-top: 1px solid var(--border);
  }

  .hero {
    padding: 60px 0 40px;
  }

  .who-we-are .two-col {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .who-we-are-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}