:root {
  /* Colors - Dark Theme */
  --color-bg-primary: #0d0d1a;
  --color-bg-secondary: #161628;
  --color-bg-card: #1a1a2e;
  --color-bg-card-hover: #222240;
  --color-border: #2a2a4a;
  --color-text-primary: #e8e8f0;
  --color-text-secondary: #a0a0b8;
  --color-text-muted: #6a6a85;
  --color-accent: #4a7cff;
  --color-accent-hover: #3a6aee;
  --color-accent-glow: rgba(74, 124, 255, 0.15);
  --color-cta: #00c896;
  --color-cta-hover: #00b085;
  --color-cta-glow: rgba(0, 200, 150, 0.15);
  --color-danger: #ff4a6a;
  --color-highlight: #ffd166;
  --color-table-highlight: rgba(74, 124, 255, 0.08);

  /* Typography */
  --font-family: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Meiryo", 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: 2rem;
  --font-size-hero: clamp(2rem, 5vw, 3.5rem);
  --font-size-hero-sub: clamp(1rem, 2.5vw, 1.25rem);
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-bold: 700;
  --line-height-body: 1.8;
  --line-height-heading: 1.3;

  /* Spacing (8px base grid) */
  --space-2xs: 0.25rem;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-section: clamp(4rem, 8vw, 7rem);

  /* Layout */
  --container-max: 1100px;
  --container-padding: 1.25rem;
  --border-radius: 12px;
  --border-radius-sm: 8px;
  --border-radius-lg: 16px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;

  /* Shadows */
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-card-hover: 0 8px 32px rgba(0, 0, 0, 0.4);
}