/* ============================================
   eBook Manager — Design Tokens (Premium Modern)
   ============================================ */

:root {
  /* ── Backgrounds ── */
  --bg-primary: #09090b; /* Zinc 950 */
  --bg-secondary: #18181b; /* Zinc 900 */
  --bg-tertiary: #27272a; /* Zinc 800 */
  --bg-glass: rgba(255, 255, 255, 0.03);
  --bg-glass-hover: rgba(255, 255, 255, 0.08);

  /* ── Borders ── */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.15);
  --border-accent: rgba(99, 102, 241, 0.4);

  /* ── Accent (Indigo / Violet) ── */
  --accent: #818cf8; /* Indigo 400 */
  --accent-hover: #a5b4fc; /* Indigo 300 */
  --accent-glow: rgba(99, 102, 241, 0.25);
  --accent-gradient: linear-gradient(135deg, #6366f1, #8b5cf6);

  /* ── Text ── */
  --text-primary: #f4f4f5; /* Zinc 50 */
  --text-secondary: #a1a1aa; /* Zinc 400 */
  --text-tertiary: #71717a; /* Zinc 500 */

  /* ── Semantic ── */
  --success: #34d399; /* Emerald 400 */
  --success-bg: rgba(16, 185, 129, 0.1);
  --warning: #fbbf24; /* Amber 400 */
  --warning-bg: rgba(245, 158, 11, 0.1);
  --danger: #f87171; /* Red 400 */
  --danger-bg: rgba(239, 68, 68, 0.1);
  --info: #60a5fa; /* Blue 400 */
  --info-bg: rgba(59, 130, 246, 0.1);

  /* ── Shadows ── */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 16px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 16px 32px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);

  /* ── Radii ── */
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  /* ── Transitions ── */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms cubic-bezier(0.16, 1, 0.3, 1);
}