:root {
  /* --- Colors: Light (nordbones-inspired cool greyscale + blue accent) --- */
  --color-bg: #eceff4;
  --color-bg-alt: #e5e9f0;
  --color-surface: #f2f4f8;
  --color-text: #2e3440;
  --color-text-muted: #4c566a;
  --color-accent: #5e81ac;
  --color-accent-hover: #4c6e96;
  --color-border: #d8dee9;
  --color-link: #5e81ac;
  --color-link-hover: #2e3440;

  /* Game of Life */
  --gol-cell: rgba(94, 129, 172, 0.12);
  --gol-grid: rgba(46, 52, 64, 0.02);

  /* --- Type Scale (1.25 ratio) --- */
  --text-xs: 0.8rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.563rem;
  --text-3xl: 1.953rem;
  --text-4xl: 2.441rem;
  --text-5xl: 3.052rem;

  /* --- Spacing Scale --- */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* --- Layout --- */
  --max-width: 64rem;
  --content-width: 48rem;
  --radius: 0.5rem;
  --radius-lg: 1rem;

  /* --- Transitions --- */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

[data-theme="dark"] {
  --color-bg: #2e3440;
  --color-bg-alt: #3b4252;
  --color-surface: #343a48;
  --color-text: #eceff4;
  --color-text-muted: #8a919e;
  --color-accent: #88c0d0;
  --color-accent-hover: #a3d4e0;
  --color-border: #434c5e;
  --color-link: #88c0d0;
  --color-link-hover: #eceff4;

  --gol-cell: rgba(136, 192, 208, 0.10);
  --gol-grid: rgba(236, 239, 244, 0.01);
}