:root {
  /* Typography measured from index.html at 1440px and 100% zoom. */
  --font-heading: "Plus Jakarta Sans", "Poppins", sans-serif;
  --font-body: "Plus Jakarta Sans", "Poppins", sans-serif;
  --font-logo: "Poppins", sans-serif;
  --fs-hero: 4.5rem;
  --fs-h1: 2rem;
  --fs-h2: 2rem;
  --fs-h3: 1.4rem;
  --fs-h4: 1.1rem;
  --fs-card-title: 1.1rem;
  --fs-body: 1.1rem;
  --fs-base: 0.875rem;
  --fs-small: 0.78rem;
  --fs-label: 0.78rem;
  --fs-control: 0.9rem;
  --weight-regular: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;
  --weight-nav: 800;
  --leading-hero: 1.04;
  --leading-heading: 1.25;
  --leading-card: 1.35;
  --leading-body: 1.5;
  --tracking-normal: 0;
  --tracking-label: 0.08em;

  /* Index brand and interaction colors. */
  --color-primary: #e11d8f;
  --color-primary-hover: #e60a9b;
  --color-primary-soft: rgba(225, 29, 143, 0.1);
  --color-primary-border: rgba(225, 29, 143, 0.9);
  --color-interactive: #2563eb;
  --color-interactive-hover: #1d4ed8;
  --color-interactive-soft: #eef6ff;
  --color-interactive-wash: rgba(37, 99, 235, 0.1);
  --color-logo-start: #ff0bac;
  --color-logo-end: #2196f3;
  --gradient-logo: linear-gradient(90deg, var(--color-logo-start) 0%, var(--color-logo-end) 100%);
  --gradient-brand: linear-gradient(135deg, var(--color-primary), var(--color-interactive));

  /* Index light surfaces and neutral text roles. */
  --color-page: #f6f8fb;
  --color-surface: #ffffff;
  --color-surface-muted: #eef6ff;
  --color-border: #e2e8f0;
  --color-border-soft: var(--color-border);
  --color-border-field: #dddddd;
  --color-heading: #2c3e50;
  --color-card-heading: #0f172a;
  --color-text: #2c3e50;
  --color-nav: #1f2937;
  --color-profile: #111827;
  --color-muted: #64748b;
  --color-text-muted: var(--color-muted);
  --color-text-subtle: var(--color-muted);
  --color-muted-legacy: #6c757d;
  --color-input-text: #000000;

  /* Index hero dark family. */
  --color-dark-page: #08111f;
  --color-dark-surface: #0b1220;
  --color-dark-raised: var(--color-dark-surface);
  --color-dark-border: rgba(255, 255, 255, 0.08);
  --color-dark-text: #ffffff;
  --color-dark-muted: #d9e5f5;
  --color-dark-small: #bdd1e8;
  --color-dark-glass: rgba(255, 255, 255, 0.08);
  --color-dark-glass-strong: rgba(255, 255, 255, 0.14);
  --color-interactive-border: rgba(37, 99, 235, 0.28);

  /* Index status colors; restricted to genuine states. */
  --color-success: #10b981;
  --color-success-soft: rgba(16, 185, 129, 0.1);
  --color-warning: #f59e0b;
  --color-warning-soft: rgba(245, 158, 11, 0.1);
  --color-danger: #dc3545;
  --color-danger-soft: rgba(220, 53, 69, 0.1);
  --color-info: #06b6d4;

  /* Index effects. */
  --color-focus-ring: rgba(37, 99, 235, 0.35);
  --color-header-hairline: rgb(240, 57, 15);
  --color-overlay: rgba(8, 17, 31, 0.72);
  --color-shadow: rgba(15, 23, 42, 0.11);
  --color-shadow-soft: rgba(15, 23, 42, 0.08);
  --color-transparent: transparent;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --radius-sm: 0.3125rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-pill: 999px;
  --shadow-sm: 0 0.625rem 1.5rem var(--color-shadow-soft);
  --shadow-md: 0 1.375rem 3.4375rem var(--color-shadow);
  --container-navbar: 111.25rem;
  --navbar-height: 4.75rem;
  --control-height: 2.75rem;
  --transition-fast: 160ms ease;
  --transition-base: 240ms ease;
}