:root {
  /* Current visual values are preserved for Phase 1. */
  --color-ink: #14213d;
  --color-muted: #5c667d;
  --color-brand: #0f766e;
  --color-brand-dark: #115e59;
  --color-accent: #f59e0b;
  --color-accent-hover: #fbbf24;
  --color-paper: #f7fafc;
  --color-surface: #ffffff;
  --color-line: #dbe4ee;
  --color-focus: #1268d3;
  --color-danger: #b42318;
  --color-header: #14213d;
  --color-header-active: #29506b;
  --color-header-text: #dfe8f5;
  --color-header-muted: #b9c6d9;
  --color-hero-text: #dce8f2;
  --color-hero-start: #102a43;
  --color-accent-soft: #fbd38d;
  --color-badge-text: #e9f3fa;
  --color-panel-soft: #edf7f5;
  --color-table-heading: #f1f5f9;
  --color-notice: #fffaf0;
  --color-notice-text: #594214;
  --color-footer-muted: #aebdd0;
  --color-white-08: rgba(255, 255, 255, 0.08);
  --color-white-12: rgba(255, 255, 255, 0.12);
  --color-white-15: rgba(255, 255, 255, 0.15);
  --color-white-22: rgba(255, 255, 255, 0.22);
  --color-white-25: rgba(255, 255, 255, 0.25);
  --color-white-35: rgba(255, 255, 255, 0.35);
  --color-white-55: rgba(255, 255, 255, 0.55);
  --color-accent-glow: rgba(245, 158, 11, 0.24);

  --font-ja: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", sans-serif;
  --font-latin: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-sans: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Arial, sans-serif;

  --container-wide: 1180px;
  --container-reading: 760px;
  --viewport-gutter: 16px;
  --viewport-gutter-mobile: 12px;

  --space-1: 0.5rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4rem;
  --space-8: 6rem;
  --space-9: 8rem;
  --space-section: 70px;
  --space-section-mobile: 52px;
  --space-section-tight: 42px;
  --space-hero: 92px;
  --space-hero-mobile: 72px;

  --radius-small: 4px;
  --radius-medium: 8px;
  --radius-media: 12px;
  --radius-notice: 12px;
  --radius-table: 16px;
  --radius-card: 18px;
  --radius-panel: 24px;
  --radius-pill: 999px;

  --shadow-card: 0 8px 28px rgba(20, 33, 61, 0.05);
  --shadow-menu: 0 14px 36px rgba(16, 24, 40, 0.18);

  --z-header: 20;
  --z-dropdown: 30;
  --z-skip-link: 100;

  --header-height: 68px;

  --duration-fast: 180ms;
  --duration-medium: 280ms;
  --duration-slow: 400ms;
  --ease-standard: ease;

  --focus-width: 3px;
  --focus-offset: 3px;
}