:root {
  /* Brand palette — dark navy / blue AI theme */
  --color-bg-primary: #060d18;
  --color-bg-secondary: #0a1628;
  --color-bg-elevated: #111f35;
  --color-bg-surface: #162544;
  --color-border: rgba(148, 163, 184, 0.16);
  --color-border-strong: rgba(148, 163, 184, 0.28);

  --color-text-primary: #f1f5f9;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;

  --color-accent: #3b82f6;
  --color-accent-hover: #2563eb;
  --color-accent-soft: rgba(59, 130, 246, 0.12);
  --color-accent-glow: rgba(59, 130, 246, 0.35);

  --color-cyan: #06b6d4;
  --color-cyan-soft: rgba(6, 182, 212, 0.12);

  --gradient-brand: linear-gradient(135deg, var(--color-accent) 0%, var(--color-cyan) 100%);
  --gradient-hero: radial-gradient(ellipse at 20% 50%, rgba(59, 130, 246, 0.18) 0%, transparent 55%),
                   radial-gradient(ellipse at 80% 20%, rgba(6, 182, 212, 0.12) 0%, transparent 50%),
                   var(--color-bg-primary);

  /* Typography */
  --font-family-base: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: clamp(1.875rem, 4vw, 2.75rem);
  --font-size-4xl: clamp(2.25rem, 5vw, 3.5rem);

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  --line-height-tight: 1.2;
  --line-height-base: 1.6;
  --line-height-relaxed: 1.75;

  /* Spacing */
  --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;

  /* Layout */
  --container-max: 75rem;
  --header-height: 4.5rem;
  --header-height-scrolled: 4rem;

  /* Effects */
  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 1rem;
  --radius-xl: 1.25rem;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.24);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.32);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.4);
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;

  /* Premium homepage card system */
  --card-surface: #ffffff;
  --card-border: #c5d4e6;
  --card-border-hover: rgba(37, 99, 235, 0.48);
  --card-shadow: 0 8px 24px rgba(7, 29, 73, 0.075);
  --card-shadow-hover: 0 14px 32px rgba(7, 29, 73, 0.12), 0 0 0 1px rgba(59, 130, 246, 0.06);
  --card-focus-ring: 0 0 0 3px var(--color-accent-soft);

  /* Z-index scale */
  --z-header: 100;
  --z-overlay: 200;
  --z-skip-link: 300;

  /* Light-theme semantic tokens (used by career-pathways, homepage sections) */
  --white: #ffffff;
  --page: #f7faff;
  --text: #13263f;
  --muted: #5c7290;
  --border: #dbe6f4;
  --navy: #0b2a55;
  --blue: #2f80ed;
  --blue-soft: #eaf3ff;
}

@media (prefers-reduced-motion: reduce) {
  :root {
    --transition-fast: 0ms;
    --transition-base: 0ms;
  }
}