:root {
  /* Surface colors */
  --color-bg-primary: #0a0a0f;
  --color-bg-secondary: #111118;
  --color-bg-tertiary: #1a1a24;
  --color-bg-elevated: #222230;
  --color-bg-hover: #2a2a3a;

  /* Border */
  --color-border: #2a2a3a;
  --color-border-light: #353548;

  /* Text */
  --color-text-primary: #e8e8f0;
  --color-text-secondary: #9898b0;
  --color-text-muted: #606078;
  --color-text-inverse: #0a0a0f;

  /* Accent */
  --color-accent: #6366f1;
  --color-accent-hover: #818cf8;
  --color-accent-subtle: rgba(99, 102, 241, 0.12);
  --color-accent-text: #a5b4fc;

  /* Status */
  --color-success: #22c55e;
  --color-success-subtle: rgba(34, 197, 94, 0.12);
  --color-warning: #eab308;
  --color-warning-subtle: rgba(234, 179, 8, 0.12);
  --color-error: #ef4444;
  --color-error-subtle: rgba(239, 68, 68, 0.12);
  --color-info: #3b82f6;
  --color-info-subtle: rgba(59, 130, 246, 0.12);

  /* Layout */
  --sidebar-width: 260px;
  --sidebar-collapsed: 60px;
  --content-max-width: 1120px;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;

  /* Font */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans SC', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', monospace;
}