@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;600;800&display=swap');

:root {
  --bg: #ffffff;
  --surface: #f8fafc;
  --text: #0f172a;
  --text-muted: #64748b;
  --accent: #2563eb;
  --border: rgba(0, 0, 0, 0.08);
  --nav-bg: rgba(255, 255, 255, 0.85);
}

[data-theme="dark"] {
  --bg: #020617;
  --surface: #0f172a;
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --accent: #38bdf8;
  --border: rgba(255, 255, 255, 0.1);
  --nav-bg: rgba(2, 6, 23, 0.85);
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: 'Inter', sans-serif;
  margin: 0;
  transition: background 0.3s ease, color 0.3s ease;
  -webkit-font-smoothing: antialiased;
}

.header-wow {
  position: fixed; top: 0; width: 100%; z-index: 1000;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-container {
  max-width: 1200px; margin: 0 auto; height: 64px;
  display: flex; align-items: center; justify-content: space-between; padding: 0 24px;
}

.nav-link {
  font-size: 0.85rem; font-weight: 600; color: var(--text-muted);
  text-decoration: none; transition: 0.2s;
}

.nav-link:hover, .nav-link.active { color: var(--accent); }

.wow-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 1.5rem;
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.wow-card:hover { 
  transform: translateY(-8px); 
  border-color: var(--accent); 
  box-shadow: 0 20px 40px -15px rgba(0,0,0,0.3);
}

#theme-btn {
  background: var(--surface); border: 1px solid var(--border);
  width: 36px; height: 36px; border-radius: 50%; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  color: var(--text);
}