:root {
  --color-primary-50: #f0f0f5;
  --color-primary-100: #d9d9e3;
  --color-primary-200: #b3b3c7;
  --color-primary-300: #8c8cab;
  --color-primary-400: #66668f;
  --color-primary-500: #1a1a2e;
  --color-primary-600: #151526;
  --color-primary-700: #10101e;
  --color-primary-800: #0a0a16;
  --color-primary-900: #05050e;
  --color-accent-50: #e8f0ff;
  --color-accent-100: #c5d9ff;
  --color-accent-200: #8fb6ff;
  --color-accent-300: #5a94ff;
  --color-accent-400: #2f78ff;
  --color-accent-500: #0066ff;
  --color-accent-600: #0052d6;
  --color-accent-700: #0040ad;
  --color-accent-800: #00338a;
  --color-accent-900: #002566;
  --color-neutral-50: #fafafa;
  --color-neutral-100: #f5f5f5;
  --color-neutral-200: #e5e5e5;
  --color-neutral-300: #d4d4d4;
  --color-neutral-400: #a3a3a3;
  --color-neutral-500: #737373;
  --color-neutral-600: #525252;
  --color-neutral-700: #404040;
  --color-neutral-800: #262626;
  --color-neutral-900: #171717;
  --color-success-500: #22c55e;
  --color-warning-500: #f59e0b;
  --color-error-500: #ef4444;
  --color-info-500: #3b82f6;
  --color-beige: #f4f2ef;
  --color-surface: #000000;
  --color-surface-secondary: #000000;
  --color-surface-elevated: #0a0a0a;
  --color-border: rgba(255, 255, 255, 0.16);
  --color-text: #f5f5f5;
  --color-text-secondary: rgba(255, 255, 255, 0.62);
  --color-text-inverse: #ffffff;
  --font-family-sans: "Pretendard", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --line-height-normal: 1.5;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-full: 9999px;
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-reveal: 1000ms;
  --ease-default: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out-soft: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-emphatic: cubic-bezier(0.2, 0.9, 0.2, 1);
  --container-max: 1350px;
  --header-height: 64px;
  /* GRID system: 6 vertical lines → 5 equal content columns */
  --grid-cols: 5;
  --grid-template: repeat(5, minmax(0, 1fr));
  --grid-margin: clamp(1.25rem, 5vw, 4.5rem);
  --grid-gutter: clamp(0.85rem, 2.2vw, 1.75rem);
  --grid-cell-pad: clamp(0.35rem, 0.9vw, 0.75rem);
}

/* 4K급(≥2560) — 콘텐츠 에어리어 확장 */
@media (min-width: 2560px) {
  :root {
    --container-max: 1600px;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-family-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background: var(--color-surface);
  /* antialiased 제거: Windows FHD ClearType/한글 힌팅에 불리 */
}

a {
  color: inherit;
}

:focus-visible {
  outline: 2px solid var(--color-accent-500);
  outline-offset: 2px;
}