:root {
  --bg-accent: #f3f6f9;
  --panel: #ffffff;
  --panel-soft: #f8fafc;
  --panel-muted: #edf2f7;
  --panel-subtle: #fbfcfe;
  --surface: #ffffff;
  --line: rgba(100, 116, 139, 0.24);
  --line-soft: rgba(100, 116, 139, 0.14);
  --text: #0f172a;
  --text-muted: #64748b;
  --muted: #64748b;
  --muted-strong: #334155;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-strong: #1e40af;
  --brand: var(--primary);
  --brand-strong: var(--primary-strong);
  --accent: #0d9488;
  --accent-soft: #e6f6f3;
  --danger: #dc2626;
  --success: #059669;
  --warning: #d97706;
  --overlay-strong: rgba(15, 23, 42, 0.62);
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.08), 0 2px 4px -1px rgba(15, 23, 42, 0.05);
  --shadow-lg: 0 20px 25px -5px rgba(15, 23, 42, 0.10), 0 10px 10px -5px rgba(15, 23, 42, 0.04);
  --shadow-xl: 0 25px 50px -12px rgba(15, 23, 42, 0.25);
  --shadow-glow: 0 0 20px rgba(37, 99, 235, 0.15), 0 8px 24px rgba(37, 99, 235, 0.12);
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 10px;
  --radius-xl: 14px;
  --radius-2xl: 18px;
  --ease-out-strong: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-out-soft: cubic-bezier(0.24, 0.8, 0.32, 1);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
  --dur-instant: 80ms;
  --dur-quick: 120ms;
  --dur-fast: 180ms;
  --dur-medium: 240ms;
  --dur-panel: 280ms;
  --dur-slow: 350ms;
  --actions-gap: clamp(5px, calc((100vw - 520px) * 1), 10px);

  /* Typography Families */
  --font-sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI',
    'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei UI', 'Microsoft YaHei',
    'Noto Sans CJK SC', 'Noto Sans SC', Arial, sans-serif;
  --font-mono: 'SFMono-Regular', 'Cascadia Code', 'Cascadia Mono', Consolas, 'Liberation Mono', monospace;

  /* Typography Scale */
  --font-xs: 11px;
  --font-sm: 14px;
  --font-base: 15px;
  --font-md: 16px;
  --font-lg: 17px;
  --font-xl: 19px;
  --font-2xl: 21px;
  --font-3xl: 25px;
  --font-4xl: 29px;

  /* Line Heights */
  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  --leading-loose: 1.75;

  /* Letter Spacing */
  --tracking-tighter: 0;
  --tracking-tight: 0;
  --tracking-normal: 0;
  --tracking-wide: 0;
  --tracking-wider: 0;

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

:root[data-theme='dark'] {
  --bg-accent: #0a0e13;
  --panel: #151b24;
  --panel-soft: #111720;
  --panel-muted: #0d1219;
  --panel-subtle: #1a2230;
  --surface: #151b24;
  --line: rgba(148, 163, 184, 0.16);
  --line-soft: rgba(148, 163, 184, 0.09);
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --muted: #94a3b8;
  --muted-strong: #cbd5e1;
  --primary: #60a5fa;
  --primary-hover: #93c5fd;
  --primary-strong: #bfdbfe;
  --brand: var(--primary);
  --brand-strong: var(--primary-strong);
  --accent: #2dd4bf;
  --accent-soft: rgba(45, 212, 191, 0.12);
  --danger: #f87171;
  --success: #34d399;
  --warning: #fbbf24;
  --overlay-strong: rgba(0, 0, 0, 0.75);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4), 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.45), 0 2px 4px -1px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.50), 0 10px 10px -5px rgba(0, 0, 0, 0.40);
  --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.60);
  --shadow-glow: 0 0 20px rgba(96, 165, 250, 0.20), 0 8px 24px rgba(96, 165, 250, 0.15);
}