:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --secondary: #7c3aed;
  --success: #059669;
  --warning: #d97706;
  --danger: #dc2626;
  --info: #0284c7;
  --dark: #1f2937;
  --light: #f8fafc;

  /* Design tokens */
  --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --card-shadow: 0 8px 30px rgba(15, 23, 42, 0.08);
  --glass-blur: 12px;
  --container-max: 1200px;
}

[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --border-color: #475569;
}

[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #e2e8f0;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --border-color: #e2e8f0;
}

/* Glass Effect Variants by Theme */
.glass {
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(var(--glass-blur));
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-md);
  box-shadow: var(--card-shadow);
}

[data-theme="dark"] .glass {
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid rgba(100, 116, 139, 0.2);
}

[data-theme="light"] .glass {
  background: rgba(248, 250, 252, 0.9);
  border: 1px solid rgba(226, 232, 240, 0.5);
}

/* Theme-specific gradient backgrounds */
[data-theme="dark"] .gradient-bg {
  background: linear-gradient(135deg, #1e3a8a 0%, #581c87 100%);
}

[data-theme="light"] .gradient-bg {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

/* Scrollbar theming */
[data-theme="dark"] ::-webkit-scrollbar {
  width: 8px;
  background: var(--bg-secondary);
}

[data-theme="dark"] ::-webkit-scrollbar-thumb {
  background: var(--bg-tertiary);
  border-radius: 4px;
}

[data-theme="light"] ::-webkit-scrollbar {
  width: 8px;
  background: var(--bg-tertiary);
}

[data-theme="light"] ::-webkit-scrollbar-thumb {
  background: var(--text-secondary);
  border-radius: 4px;
}

/* Selection theming */
[data-theme="dark"] ::selection {
  background: rgba(37, 99, 235, 0.3);
  color: var(--text-primary);
}

[data-theme="light"] ::selection {
  background: rgba(37, 99, 235, 0.2);
  color: var(--text-primary);
}