:root {
  /* Brand primitives: these never change between themes. */
  --color-primary: #1267f4;
  --color-primary-light: #0084ff;
  --color-primary-dark: #071a92;
  --color-navy: #00083a;
  --color-text: #101828;
  --color-text-secondary: #667085;
  --color-background: #f5f7fa;
  --color-surface: #ffffff;
  --background-gradient: linear-gradient(
    135deg,
    #02072f 0%,
    #071a92 55%,
    #0878f9 100%
  );

  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
  --nav-height: 56px;
  --radius: 3px;
  --radius-sm: var(--radius);
  --radius-md: var(--radius);
}

:root,
:root[data-theme='light'] {
  color-scheme: light;

  /* Semantic light-theme tokens. */
  --bg: var(--color-background);
  --surface: var(--color-surface);
  --surface-hover: #f7f9ff;
  --surface-highlight: #eef3ff;
  --surface-highlight-hover: #e5edff;
  --surface-2: var(--surface-highlight);
  --surface-raised: var(--color-surface);
  --border: rgba(7, 26, 146, 0.12);
  --border-active: rgba(18, 103, 244, 0.34);
  --text-primary: var(--color-text);
  --text-secondary: var(--color-text-secondary);
  --text-muted: var(--color-text-secondary);
  --text-dim: var(--color-text-secondary);
  --accent: var(--color-primary);
  --accent-hover: var(--color-primary-dark);
  --accent-dim: var(--color-primary-dark);
  --accent-faint: rgba(18, 103, 244, 0.04);
  --accent-faint-md: rgba(18, 103, 244, 0.09);
  --on-accent: var(--color-surface);
  --shadow: rgba(0, 8, 58, 0.14);

  --nav-bg: rgba(255, 255, 255, 0.92);
  --nav-menu-bg: var(--color-surface);
  --nav-border: rgba(7, 26, 146, 0.12);
  --nav-text: var(--color-text-secondary);
  --nav-text-hover: var(--color-primary-dark);
  --nav-text-active: var(--color-primary-dark);
  --nav-control-border: rgba(18, 103, 244, 0.3);

  --status-success: #15803d;
  --status-success-border: rgba(21, 128, 61, 0.25);
  --status-success-bg: rgba(21, 128, 61, 0.07);
  --status-warning: #a16207;
  --status-warning-border: rgba(161, 98, 7, 0.25);
  --status-warning-bg: rgba(161, 98, 7, 0.07);
  --status-error: #b42318;
}

:root[data-theme='dark'] {
  color-scheme: dark;

  /* Semantic dark-theme tokens. */
  --bg: #02072f;
  --surface: var(--color-navy);
  --surface-hover: #03104a;
  --surface-highlight: #041557;
  --surface-highlight-hover: #051b68;
  --surface-2: var(--surface-highlight);
  --surface-raised: var(--color-navy);
  --border: rgba(0, 132, 255, 0.2);
  --border-active: rgba(0, 132, 255, 0.5);
  --text-primary: var(--color-background);
  --text-secondary: rgba(245, 247, 250, 0.8);
  --text-muted: rgba(245, 247, 250, 0.68);
  --text-dim: rgba(245, 247, 250, 0.56);
  --accent: var(--color-primary-light);
  --accent-hover: var(--color-primary);
  --accent-dim: var(--color-primary-light);
  --accent-faint: rgba(0, 132, 255, 0.08);
  --accent-faint-md: rgba(0, 132, 255, 0.14);
  --on-accent: var(--color-navy);
  --shadow: rgba(0, 0, 0, 0.32);

  --nav-bg: rgba(0, 8, 58, 0.92);
  --nav-menu-bg: var(--color-navy);
  --nav-border: rgba(245, 247, 250, 0.14);
  --nav-text: rgba(245, 247, 250, 0.7);
  --nav-text-hover: var(--color-background);
  --nav-text-active: var(--color-surface);
  --nav-control-border: rgba(245, 247, 250, 0.3);

  --status-success: #4ade80;
  --status-success-border: rgba(74, 222, 128, 0.3);
  --status-success-bg: rgba(74, 222, 128, 0.1);
  --status-warning: #facc15;
  --status-warning-border: rgba(250, 204, 21, 0.3);
  --status-warning-bg: rgba(250, 204, 21, 0.1);
  --status-error: #f87171;
}

:root {
  /* Compatibility aliases consumed by existing components. */
  --border-subtle: var(--border);
  --blue: var(--accent);
}

html {
  min-height: 100%;
  background: var(--bg);
}

body {
  font-family: var(--font-body);
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
  transition: background-color 0.2s ease, color 0.2s ease;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

button,
input,
textarea,
select {
  font: inherit;
}

@media (prefers-reduced-motion: reduce) {
  body {
    transition: none;
  }
}