:root {
  /* Color */
  --bg: #FAFAF9;
  --surface: #FFFFFF;
  --surface-sunken: #F3F2EE;
  --border: #E4E1DA;
  --border-strong: #D2CEC3;
  --ink: #1B1D22;
  --ink-muted: #6B6E76;
  --ink-faint: #9A9CA3;
  --primary: #0072C6;
  --primary-dark: #005A9E;
  --primary-tint: #E5F1FB;
  --accent: #E8A33D;
  --accent-tint: #FBF0DC;
  --danger: #C0392B;
  --danger-tint: #FBEAE7;
  --success: #3F8F5F;
  --focus-ring: #1C6E8C;

  /* Type */
  --font-ui: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, monospace;

  /* Scale */
  --fs-xs: 11px;
  --fs-sm: 12.5px;
  --fs-base: 14px;
  --fs-md: 15px;
  --fs-lg: 18px;
  --fs-xl: 22px;

  /* Space */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 24px;
  --sp-6: 32px;

  /* Layout */
  --rail-width: 232px;
  --list-width: 360px;
  --topbar-height: 52px;
  --radius-sm: 6px;
  --radius-md: 10px;

  /* Motion */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --dur-fast: 120ms;
  --dur-med: 200ms;
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}