:root {
  --sec-bg: #ffffff;
  --sec-surface: #ffffff;
  --sec-ink: #24333f;
  --sec-muted: #465563;
  --sec-primary: #275a6d;
  --sec-accent: #d8e9ef;
  --sec-dark: #20343f;
  --sec-border: #c5d6dd;
  --sec-panel: #eef5f7;
  --sec-focus: #275a6d;
  --sec-button-ink: #ffffff;
  --sec-font: 'Segoe UI', Arial, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --sec-bg: #20343f;
    --sec-surface: #24323b;
    --sec-ink: #f2f5f7;
    --sec-muted: #d2dce2;
    --sec-primary: #d8e9ef;
    --sec-border: #81939e;
    --sec-panel: #24323b;
    --sec-focus: #d8e9ef;
    --sec-button-ink: #20343f;
  }
}