:root {
  /* Color: brand */
  --color-primary: #0f172a;
  --color-primary-soft: #1e293b;
  --color-primary-deep: #020617;
  --color-accent: #111827;
  --color-accent-hover: #020617;
  --color-accent-soft: #e5e7eb;
  --color-accent-faint: rgba(17, 24, 39, 0.08);

  /* Color: background / surface */
  --color-bg: #f8fafc;
  --color-bg-soft: #eef2ff;
  --color-surface: #ffffff;
  --color-surface-soft: #f8fafc;
  --color-surface-navy: #111827;
  --color-surface-navy-soft: rgba(255, 255, 255, 0.08);

  /* Color: text */
  --text-strong: #0f172a;
  --text-body: #334155;
  --text-muted: #64748b;
  --text-subtle: #94a3b8;
  --text-on-dark: #ffffff;
  --text-on-dark-soft: rgba(255, 255, 255, 0.82);
  --text-on-dark-muted: rgba(255, 255, 255, 0.62);

  /* Color: border / line */
  --border-base: #e2e8f0;
  --border-soft: #e5e7eb;
  --line-on-dark: rgba(255, 255, 255, 0.12);
  --line-on-dark-strong: rgba(255, 255, 255, 0.2);

  /* Color: status */
  --color-success: #16a34a;
  --color-warning: #d97706;
  --color-danger: #dc2626;
  --color-info: #111827;

  /* Typography */
  --font-base: "Pretendard", -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Segoe UI", system-ui, sans-serif;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 650;
  --font-weight-bold: 760;
  --font-weight-extrabold: 850;

  --text-hero: clamp(42px, 6vw, 68px);
  --text-h1: clamp(36px, 5vw, 56px);
  --text-h2: clamp(30px, 4vw, 42px);
  --text-h3: clamp(20px, 2vw, 24px);
  --text-body-lg: 18px;
  --text-body-md: 16px;
  --text-body-sm: 14px;
  --text-caption: 13px;
  --text-label: 12px;

  --leading-tight: 1.08;
  --leading-heading: 1.22;
  --leading-body: 1.68;
  --tracking-tight: -0.045em;
  --tracking-heading: -0.035em;
  --tracking-label: 0.08em;

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-7: 32px;
  --space-8: 40px;
  --space-9: 48px;
  --space-10: 64px;
  --space-11: 80px;
  --space-12: 96px;
  --space-13: 120px;

  /* Layout */
  --container: 1200px;
  --container-narrow: 920px;
  --header-height: 72px;
  --grid-gap: 24px;

  /* Radius */
  --radius-xs: 3px;
  --radius-sm: 3px;
  --radius-md: 3px;
  --radius-lg: 3px;
  --radius-hero: 3px;
  --radius-pill: 3px;

  /* Shadow */
  --shadow-sm: 0 10px 30px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 18px 55px rgba(15, 23, 42, 0.12);
  --shadow-lg: 0 28px 90px rgba(15, 23, 42, 0.18);
  --shadow-navy: 0 34px 100px rgba(2, 6, 23, 0.36);

  /* Motion */
  --ease-base: cubic-bezier(0.2, 0.8, 0.2, 1);
  --transition-fast: 160ms var(--ease-base);
  --transition-base: 240ms var(--ease-base);

  /* Z-index */
  --z-header: 50;
  --z-overlay: 100;
}