:root {
  /* Brand */
  --fs-color-field-navy-950: #0b172a;
  --fs-color-field-navy-900: #10223f;
  --fs-color-field-navy-800: #15345f;
  --fs-color-field-navy-700: #1d4a7d;
  --fs-color-weather-teal-700: #0f766e;
  --fs-color-weather-teal-600: #0d9488;
  --fs-color-sky-600: #0284c7;
  --fs-color-sky-700: #0369a1;
  --fs-color-amber-500: #d97706;

  /* Neutrals */
  --fs-color-slate-950: #020617;
  --fs-color-slate-900: #0f172a;
  --fs-color-slate-800: #1e293b;
  --fs-color-slate-700: #334155;
  --fs-color-slate-600: #475569;
  --fs-color-slate-500: #64748b;
  --fs-color-slate-300: #cbd5e1;
  --fs-color-slate-200: #e2e8f0;
  --fs-color-slate-100: #f1f5f9;
  --fs-color-slate-50: #f8fafc;

  /* Surfaces */
  --fs-color-page: #f6f8fb;
  --fs-color-surface: #ffffff;
  --fs-color-surface-muted: #f8fafc;
  --fs-color-surface-strong: #eef4f8;

  /* Text */
  --fs-color-text: var(--fs-color-slate-900);
  --fs-color-text-muted: var(--fs-color-slate-600);
  --fs-color-text-subtle: var(--fs-color-slate-500);
  --fs-color-text-inverse: #ffffff;

  /* Borders */
  --fs-color-border: #d8e0ea;
  --fs-color-border-strong: #b7c4d4;

  /* Professional palette aliases */
  --fs-palette-primary: var(--fs-color-field-navy-900);
  --fs-palette-primary-hover: var(--fs-color-field-navy-800);
  --fs-palette-primary-soft: #eaf1f8;
  --fs-palette-accent: var(--fs-color-weather-teal-700);
  --fs-palette-accent-hover: var(--fs-color-weather-teal-600);
  --fs-palette-accent-soft: #ecfdf5;
  --fs-palette-link: var(--fs-color-field-navy-700);
  --fs-palette-link-hover: var(--fs-color-field-navy-900);
  --fs-palette-highlight: var(--fs-color-amber-500);
  --fs-palette-highlight-soft: #fffbeb;

  /* Status */
  --fs-color-success: #15803d;
  --fs-color-success-bg: #ecfdf3;
  --fs-color-warning: #b45309;
  --fs-color-warning-bg: #fffbeb;
  --fs-color-danger: #b91c1c;
  --fs-color-danger-bg: #fef2f2;
  --fs-color-info: var(--fs-color-sky-700);
  --fs-color-info-bg: #eff6ff;

  /* Typography */
  --fs-font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --fs-font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  --fs-font-size-xs: 0.75rem;
  --fs-font-size-sm: 0.875rem;
  --fs-font-size-base: 1rem;
  --fs-font-size-lg: 1.125rem;
  --fs-font-size-xl: 1.25rem;
  --fs-font-size-2xl: 1.5rem;
  --fs-font-size-3xl: 2rem;
  --fs-font-size-4xl: 2.75rem;
  --fs-line-height-tight: 1.15;
  --fs-line-height-base: 1.5;
  --fs-line-height-relaxed: 1.65;
  --fs-font-weight-regular: 400;
  --fs-font-weight-medium: 600;
  --fs-font-weight-bold: 800;

  /* Spacing */
  --fs-space-1: 0.25rem;
  --fs-space-2: 0.5rem;
  --fs-space-3: 0.75rem;
  --fs-space-4: 1rem;
  --fs-space-5: 1.25rem;
  --fs-space-6: 1.5rem;
  --fs-space-8: 2rem;
  --fs-space-10: 2.5rem;
  --fs-space-12: 3rem;
  --fs-space-16: 4rem;

  /* Radius */
  --fs-radius-sm: 0.375rem;
  --fs-radius-md: 0.75rem;
  --fs-radius-lg: 1rem;
  --fs-radius-xl: 1.5rem;
  --fs-radius-pill: 999px;

  /* Shadow */
  --fs-shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.08);
  --fs-shadow-md: 0 8px 24px rgba(15, 23, 42, 0.10);
  --fs-shadow-lg: 0 18px 45px rgba(15, 23, 42, 0.12);

  /* Focus */
  --fs-focus-ring: 0 0 0 3px rgba(13, 148, 136, 0.28);
  --fs-focus-outline: 2px solid var(--fs-color-weather-teal-600);

  /* Layout */
  --fs-layout-page-max: 1180px;
  --fs-layout-readable-max: 760px;
  --fs-layout-shell-padding: clamp(1rem, 2vw, 2rem);

  /* Z-index */
  --fs-z-base: 1;
  --fs-z-header: 20;
  --fs-z-overlay: 50;
  --fs-z-modal: 100;
}

/* Theme role tokens */
:root,
[data-fs-theme="light"] {
  color-scheme: light;
  --fs-theme-color-page: var(--fs-color-page);
  --fs-theme-color-surface: var(--fs-color-surface);
  --fs-theme-color-surface-muted: var(--fs-color-surface-muted);
  --fs-theme-color-surface-strong: var(--fs-color-surface-strong);
  --fs-theme-color-text: var(--fs-color-text);
  --fs-theme-color-text-muted: var(--fs-color-text-muted);
  --fs-theme-color-text-subtle: var(--fs-color-text-subtle);
  --fs-theme-color-border: var(--fs-color-border);
  --fs-theme-color-border-strong: var(--fs-color-border-strong);
  --fs-theme-color-primary: var(--fs-palette-primary);
  --fs-theme-color-primary-hover: var(--fs-palette-primary-hover);
  --fs-theme-color-primary-text: #ffffff;
  --fs-theme-color-accent: var(--fs-palette-accent);
  --fs-theme-color-accent-hover: var(--fs-palette-accent-hover);
  --fs-theme-color-link: var(--fs-palette-link);
  --fs-theme-color-link-hover: var(--fs-palette-link-hover);
  --fs-theme-color-highlight: var(--fs-palette-highlight);
  --fs-theme-focus-ring: var(--fs-focus-ring);
}

[data-fs-theme="dark"] {
  color-scheme: dark;
  --fs-theme-color-page: #07111f;
  --fs-theme-color-surface: #0f1f38;
  --fs-theme-color-surface-muted: #132a47;
  --fs-theme-color-surface-strong: #18385d;
  --fs-theme-color-text: #f8fafc;
  --fs-theme-color-text-muted: #cbd5e1;
  --fs-theme-color-text-subtle: #94a3b8;
  --fs-theme-color-border: #36516f;
  --fs-theme-color-border-strong: #4f6f93;
  --fs-theme-color-primary: #7dd3fc;
  --fs-theme-color-primary-hover: #bae6fd;
  --fs-theme-color-primary-text: #07111f;
  --fs-theme-color-accent: #5eead4;
  --fs-theme-color-accent-hover: #99f6e4;
  --fs-theme-color-link: #93c5fd;
  --fs-theme-color-link-hover: #bfdbfe;
  --fs-theme-color-highlight: #fbbf24;
  --fs-theme-focus-ring: 0 0 0 3px rgba(125, 211, 252, 0.35);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-fs-theme]) {
    color-scheme: dark;
    --fs-theme-color-page: #07111f;
    --fs-theme-color-surface: #0f1f38;
    --fs-theme-color-surface-muted: #132a47;
    --fs-theme-color-surface-strong: #18385d;
    --fs-theme-color-text: #f8fafc;
    --fs-theme-color-text-muted: #cbd5e1;
    --fs-theme-color-text-subtle: #94a3b8;
    --fs-theme-color-border: #36516f;
    --fs-theme-color-border-strong: #4f6f93;
    --fs-theme-color-primary: #7dd3fc;
    --fs-theme-color-primary-hover: #bae6fd;
    --fs-theme-color-primary-text: #07111f;
    --fs-theme-color-accent: #5eead4;
    --fs-theme-color-accent-hover: #99f6e4;
    --fs-theme-color-link: #93c5fd;
    --fs-theme-color-link-hover: #bfdbfe;
    --fs-theme-color-highlight: #fbbf24;
    --fs-theme-focus-ring: 0 0 0 3px rgba(125, 211, 252, 0.35);
  }
}