:root {
  /* ── Background Layers ── */
  --bg-primary:      #0B0E14;
  --bg-secondary:    #111621;
  --bg-card:         #151B28;
  --bg-card-hover:   #1A2235;
  --bg-input:        #0F1520;

  /* ── Borders ── */
  --border-subtle:   #1E2738;
  --border-active:   #2A3650;

  /* ── Text ── */
  --text-primary:    #F1F3F7;
  --text-secondary:  #8B95A8;
  --text-tertiary:   #545D6E;

  /* ── Accent ── */
  --accent-primary:  #6C5CE7;
  --accent-hover:    #7C6DF7;
  --accent-gradient: linear-gradient(135deg, #6C5CE7 0%, #A855F7 100%);
  --accent-glow:     0 0 20px rgba(108, 92, 231, 0.3);

  /* ── Semantic ── */
  --color-success:   #22C55E;
  --color-danger:    #EF4444;
  --color-warning:   #F59E0B;
  --color-info:      #3B82F6;

  --bg-success:      rgba(34, 197, 94, 0.12);
  --bg-danger:       rgba(239, 68, 68, 0.12);
  --bg-warning:      rgba(245, 158, 11, 0.12);
  --bg-info:         rgba(59, 130, 246, 0.12);

  /* ── Spacing ── */
  --space-1: 4px;  --space-2: 8px;  --space-3: 12px;
  --space-4: 16px; --space-5: 20px; --space-6: 24px;
  --space-8: 32px; --space-10: 40px;

  /* ── Radius ── */
  --radius-sm: 6px;  --radius-md: 10px;
  --radius-lg: 14px; --radius-xl: 18px;
  --radius-full: 9999px;

  /* ── Shadows ── */
  --shadow-card:     0 1px 3px rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.2);
  --shadow-elevated: 0 4px 12px rgba(0,0,0,0.4), 0 2px 4px rgba(0,0,0,0.3);

  /* ── Typography ── */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --text-xs:   0.75rem;
  --text-sm:   0.8125rem;
  --text-base: 0.875rem;
  --text-lg:   1rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  2rem;

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

  /* ── Layout ── */
  --sidebar-width: 260px;
  --sidebar-collapsed: 72px;
}