:root {
  /* Colour */
  --color-ink: #24344a;
  --color-text-muted: #5f6b76;
  --color-background: #eceae4;
  --color-surface: #f6f4ef;
  --color-surface-muted: #e6e8e6;
  --color-fog: #c9d5da;
  --color-primary: #405a75;
  --color-plum: #563447;
  --color-accent: #ce6c4e;
  --color-sage: #788867;
  --color-gold: #b18a49;
  --color-success: #5a745e;
  --color-warning: #8a642c;
  --color-error: #963f38;
  --color-focus: #245ca6;
  --color-inverse: #fffdf7;

  /* Typography */
  --font-display-cn: "Ma Shan Zheng", "STXingkai", "KaiTi", cursive;
  --font-display-data: "Barlow Condensed", "Arial Narrow", sans-serif;
  --font-ui: "Microsoft YaHei UI", "PingFang SC", "Noto Sans CJK SC", sans-serif;
  --font-reader: Georgia, "Times New Roman", serif;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.5rem;
  --text-2xl: clamp(1.85rem, 3vw, 2.35rem);
  --text-3xl: clamp(3.25rem, 4.7vw, 3.75rem);

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4.5rem;

  /* Geometry */
  --radius-sm: 0;
  --radius-md: 0;
  --radius-lg: 0;
  --radius-full: 9999px;
  --rule: 1px solid currentColor;
  --content-max: 1680px;
  --reader-measure: 75ch;

  /* Elevation: overlays only */
  --shadow-overlay: 0 -20px 38px rgb(20 31 44 / 18%);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}