:root {
  /* Colors */
  --bg-primary: #0a0e17;
  --bg-surface: #111827;
  --bg-elevated: #1e293b;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --accent: #10b981;
  --accent-hover: #34d399;
  --accent-secondary: #8b5cf6;
  --border: #1e293b;
  --success: #10b981;
  --gradient: linear-gradient(135deg, var(--accent), var(--accent-secondary));

  /* Typography */
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --fw-regular: 400;
  --fw-medium: 500;
  --fw-bold: 700;
  --fw-extrabold: 800;

  /* Font Sizes */
  --fs-hero: clamp(2.5rem, 5vw, 4.5rem);
  --fs-h2: clamp(1.75rem, 3vw, 2.5rem);
  --fs-h3: 1.25rem;
  --fs-body: 1rem;
  --fs-small: 0.875rem;
  --fs-xs: 0.75rem;

  /* Spacing */
  --section-py: clamp(4rem, 8vw, 7rem);
  --container-px: 1.5rem;
  --container-max: 1200px;
  --gap-sm: 0.5rem;
  --gap-md: 1rem;
  --gap-lg: 1.5rem;
  --gap-xl: 2rem;
  --gap-2xl: 3rem;

  /* Borders & Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 30px rgba(16, 185, 129, 0.15);
  --shadow-glow-strong: 0 0 40px rgba(16, 185, 129, 0.25);

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Nav */
  --nav-height: 4rem;
}

/* ===== LIGHT THEME ===== */
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-surface: #f1f5f9;
  --bg-elevated: #e2e8f0;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --accent: #059669;
  --accent-hover: #047857;
  --border: #cbd5e1;
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.08);
  --shadow-glow: 0 0 30px rgba(16, 185, 129, 0.1);
  --shadow-glow-strong: 0 0 40px rgba(16, 185, 129, 0.15);
}