/* ── CSS Custom Properties (Design Tokens) ─────────────────────────────── */
:root {
  /* Color Palette — Deep Blue Sea */
  --color-navy:        #0a1628;
  --color-navy-mid:    #132040;
  --color-navy-light:  #1e3358;
  --color-powder:      #b0cfe8;
  --color-powder-light:#d6e9f6;
  --color-fog:         #f4f8fc;
  --color-fog-dark:    #e8f1f8;
  --color-sky:         #4db8ff;
  --color-text:        #1a2e4a;
  --color-text-muted:  #4a6280;
  --color-link:        #1e6fa8;
  --color-link-hover:  #0a1628;
  --color-accent:      #2a8ed4;
  --color-border:      #c8dff0;

  /* Typography */
  --font-sans: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'Fira Code', 'Cascadia Code', 'Consolas', 'Monaco', monospace;
  --font-size-base: 1rem;
  --line-height: 1.75;

  /* Spacing */
  --space-xs:  0.25rem;
  --space-sm:  0.5rem;
  --space-md:  1rem;
  --space-lg:  1.5rem;
  --space-xl:  2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Layout */
  --header-height: 64px;
  --container-max: 1400px;
  --content-max:   1200px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(10,22,40,0.12);
  --shadow-md: 0 4px 12px rgba(10,22,40,0.15);
  --shadow-lg: 0 8px 32px rgba(10,22,40,0.2);

  /* Transitions */
  --transition: 200ms ease;
  --transition-slow: 350ms ease;

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
}