:root {
  --color-bg: #f7f8fa;
  --color-surface: #ffffff;
  --color-border: #e2e5ea;
  --color-text: #1a1d23;
  --color-text-muted: #5b6270;
  --color-accent: #1f5f8b;
  --color-accent-hover: #174a6d;
  --color-success: #1e7a4c;
  --color-warning: #a15c00;
  --color-danger: #b3261e;

  --font-sans: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.25rem;
  --text-xl: 1.5rem;
  --text-2xl: 2rem;
  --text-3xl: 2.25rem;

  --radius: 8px;
  --radius-lg: 14px;
  --shadow-card: 0 1px 3px rgba(16, 24, 40, 0.08), 0 1px 2px rgba(16, 24, 40, 0.06);
  --shadow-card-hover: 0 4px 12px rgba(16, 24, 40, 0.12), 0 2px 4px rgba(16, 24, 40, 0.08);

  --sidebar-width: 240px;

  --series-self: #2a78d6;
  --series-spouse: #1baf7a;
  --chart-surface: #fcfcfb;
  --chart-gridline: #e1e0d9;
  --chart-baseline: #c3c2b7;
  --chart-muted: #898781;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #14161a;
    --color-surface: #1c1f26;
    --color-border: #2c303a;
    --color-text: #e8eaed;
    --color-text-muted: #9aa1ac;
    --color-accent: #5b9bd5;
    --color-accent-hover: #7bb0e0;
    --color-success: #4caf7d;
    --color-warning: #d99a3d;
    --color-danger: #e5837c;
    --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.4), 0 1px 2px rgba(0, 0, 0, 0.3);

    --series-self: #3987e5;
    --series-spouse: #199e70;
    --chart-surface: #1a1a19;
    --chart-gridline: #2c2c2a;
    --chart-baseline: #383835;
    --chart-muted: #898781;
  }
}