:root {
  color-scheme: light;
  --color-background: #ffffff;
  --color-background-raised: #f5fbfa;
  --color-surface: #eaf7f6;
  --color-surface-strong: #d8efed;
  --color-border: #cfe8e6;
  --color-text: #0b2b29;
  --color-text-dim: #4f726f;
  --color-accent: #0e9e99;
  --color-accent-bright: #14b8b0;
  --color-accent-ink: #063d3b;
  --color-khaki: #4b5320;
  --color-danger: #c23b3b;
  --color-grid: rgba(14, 158, 153, 0.1);
  --color-glow: rgba(20, 184, 176, 0.16);
  --shadow-soft: 0 22px 60px rgba(11, 43, 41, 0.12);
  --shadow-card: 0 12px 34px rgba(11, 43, 41, 0.08);
  --radius-sm: 10px;
  --radius-md: 18px;
  --radius-lg: 28px;
  --radius-pill: 999px;
  --content-width: 1180px;
  --reading-width: 780px;
  --header-height: 76px;
  --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;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-instrument: ui-monospace, "SFMono-Regular", Menlo, Monaco, Consolas, monospace;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --color-background: #1c1c1e;
  --color-background-raised: #242426;
  --color-surface: #2c2c2e;
  --color-surface-strong: #343437;
  --color-border: #3a3a3c;
  --color-text: #f5f5dc;
  --color-text-dim: #a8a89a;
  --color-accent: #4b5320;
  --color-accent-bright: #6b7a2f;
  --color-accent-ink: #f5f5dc;
  --color-khaki: #6b7a2f;
  --color-danger: #d64545;
  --color-grid: rgba(245, 245, 220, 0.055);
  --color-glow: rgba(107, 122, 47, 0.18);
  --shadow-soft: 0 28px 72px rgba(0, 0, 0, 0.32);
  --shadow-card: 0 14px 38px rgba(0, 0, 0, 0.2);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    color-scheme: dark;
    --color-background: #1c1c1e;
    --color-background-raised: #242426;
    --color-surface: #2c2c2e;
    --color-surface-strong: #343437;
    --color-border: #3a3a3c;
    --color-text: #f5f5dc;
    --color-text-dim: #a8a89a;
    --color-accent: #4b5320;
    --color-accent-bright: #6b7a2f;
    --color-accent-ink: #f5f5dc;
    --color-khaki: #6b7a2f;
    --color-danger: #d64545;
    --color-grid: rgba(245, 245, 220, 0.055);
    --color-glow: rgba(107, 122, 47, 0.18);
    --shadow-soft: 0 28px 72px rgba(0, 0, 0, 0.32);
    --shadow-card: 0 14px 38px rgba(0, 0, 0, 0.2);
  }
}