:root {
  color-scheme: light;

  /* Brand — evolved from the historic UIS blue/orange palette. */
  --color-brand-950: #05243b;
  --color-brand-900: #073451;
  --color-brand-800: #07527e;
  --color-brand-700: #076ba7;
  --color-brand-600: #0a82c5;
  --color-brand-500: #1597d4;
  --color-brand-200: #b9e2f5;
  --color-brand-100: #e2f3fb;
  --color-brand-50: #f1f9fd;

  --color-accent-800: #a93d08;
  --color-accent-700: #c94d0a;
  --color-accent-600: #e45e0d;
  --color-accent-500: #f97316;
  --color-accent-400: #fb923c;
  --color-accent-200: #fed7aa;
  --color-accent-100: #ffedd5;
  --color-accent-50: #fff7ed;

  --color-neutral-950: #121c24;
  --color-neutral-900: #1b2935;
  --color-neutral-800: #293a47;
  --color-neutral-700: #405361;
  --color-neutral-600: #5f707c;
  --color-neutral-500: #788892;
  --color-neutral-400: #9aa7af;
  --color-neutral-300: #c4cdd2;
  --color-neutral-200: #dce2e6;
  --color-neutral-100: #edf1f3;
  --color-neutral-50: #f7f9fa;

  --color-white: #ffffff;
  --color-text: var(--color-brand-950);
  --color-text-secondary: var(--color-neutral-600);
  --color-background: var(--color-white);
  --color-background-soft: var(--color-brand-50);
  --color-surface: var(--color-white);
  --color-border: var(--color-neutral-200);
  --color-border-strong: var(--color-neutral-300);
  --color-success: #16835a;
  --color-warning: #b85b09;
  --color-danger: #c33232;
  --color-focus: #f59e0b;

  --font-family-base: Inter, Manrope, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-family-heading: Manrope, Inter, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: clamp(1.5rem, 2.4vw, 2rem);
  --font-size-3xl: clamp(1.75rem, 2.4vw, 2.125rem);
  --font-size-4xl: clamp(2.625rem, 3.2vw, 3.25rem);
  --line-height-tight: 1.12;
  --line-height-heading: 1.22;
  --line-height-base: 1.65;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  --radius-sm: 0.5rem;
  --radius-md: 0.875rem;
  --radius-lg: 1.25rem;
  --radius-xl: 1.75rem;
  --radius-pill: 999px;

  --shadow-sm: 0 1px 2px rgba(5, 36, 59, 0.08);
  --shadow-md: 0 10px 30px rgba(5, 52, 81, 0.1);
  --shadow-lg: 0 24px 64px rgba(5, 52, 81, 0.14);
  --shadow-accent: 0 6px 16px rgba(249, 115, 22, 0.18);

  --container-max: 75rem;
  --container-reading: 48rem;
  --container-gutter: clamp(1rem, 4vw, 2rem);
  --grid-columns: 12;
  --grid-gap: clamp(1rem, 2.5vw, 1.5rem);
  --header-height: 4.5rem;

  --icon-plate-sm: 1.75rem;
  --icon-plate-md: 2.75rem;
  --icon-plate-lg: 3rem;

  --transition-fast: 160ms ease;
  --transition-base: 240ms ease;
  --transition-slow: 420ms cubic-bezier(0.22, 1, 0.36, 1);
  --z-header: 100;
  --z-overlay: 200;
}