:root {
  /* Colors */
  /* Primary */
  --color-primary-main: #0F172A;
  --color-primary-light: #334155;
  --color-primary-dark: #020617;

  /* Secondary */
  --color-secondary-main: #0EA5E9;
  --color-secondary-light: #38BDF8;

  /* Neutral */
  --color-neutral-white: #FFFFFF;
  --color-neutral-50: #F8FAFC;
  --color-neutral-100: #F1F5F9;
  --color-neutral-200: #E2E8F0;
  --color-neutral-500: #64748B;
  --color-neutral-900: #0F172A;

  /* Semantic */
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-error: #EF4444;

  /* Typography */
  --font-family-primary: "Inter", "Noto Sans JP", sans-serif;

  /* Font Sizes */
  --text-xs: 0.75rem;
  /* 12px */
  --text-sm: 0.875rem;
  /* 14px */
  --text-base: 1rem;
  /* 16px */
  --text-lg: 1.125rem;
  /* 18px */
  --text-xl: 1.25rem;
  /* 20px */
  --text-2xl: 1.5rem;
  /* 24px */
  --text-3xl: 1.875rem;
  /* 30px */

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-12: 48px;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);

  /* Breakpoints — mirrors Tailwind's screen config */
  --screen-md: 768px;
}