:root {
  --font-sans: "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --color-bg: #ffffff;
  --color-surface: #f4f7ff;
  --color-surface-2: #e9f0ff;
  --color-text: #17243a;
  --color-text-muted: #48556d;
  --color-primary: #0a4ccf;
  --color-primary-dark: #083598;
  --color-border: #c8d8fb;
  --color-focus: #ffbf47;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;

  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --shadow-sm: 0 6px 18px rgba(12, 38, 102, 0.08);
  --shadow-md: 0 12px 30px rgba(12, 38, 102, 0.14);
  --max-width: 72rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

img {
  max-width: 100%;
  display: block;
  height: auto;
}

a {
  color: var(--color-primary-dark);
}

/* Accessibility: visible skip link for keyboard users */
.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -4rem;
  z-index: 99;
  background: #111;
  color: #fff;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  text-decoration: none;
}

.skip-link:focus {
  top: var(--space-4);
}

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
}

.container {
  width: min(100% - 2rem, var(--max-width));
  margin-inline: auto;
}

.section {
  padding-block: var(--space-7);
}

.section--alt {
  background: var(--color-surface);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.97);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(8px);
}

.header__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-block: var(--space-4);
  gap: var(--space-4);
}

.brand {
  text-decoration: none;
  font-weight: 700;
  color: var(--color-text);
}

.nav__list {
  list-style: none;
  display: flex;
  gap: var(--space-4);
  padding: 0;
  margin: 0;
}

.nav a {
  text-decoration: none;
  font-size: 0.95rem;
  color: var(--color-text);
}

.nav a:hover {
  color: var(--color-primary);
}

.section--hero {
  background:
    radial-gradient(circle at top right, #dbe8ff 0, rgba(219, 232, 255, 0) 45%),
    linear-gradient(180deg, #f7faff 0%, #ffffff 70%);
}

.hero {
  display: grid;
  gap: var(--space-6);
  align-items: center;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-primary);
}

h1,
h2,
h3 {
  line-height: 1.2;
  margin-top: 0;
}

h1 {
  font-size: clamp(1.8rem, 4.4vw, 3rem);
  margin-bottom: var(--space-4);
}

h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  margin-bottom: var(--space-5);
}

h3 {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  margin-bottom: var(--space-3);
}

.lead {
  color: var(--color-text-muted);
  max-width: 62ch;
}

.hero__badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.badge {
  border: 1px solid var(--color-border);
  background: var(--color-surface-2);
  padding: var(--space-2) var(--space-3);
  border-radius: 999px;
  font-size: 0.85rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 0.75rem;
  border: 1px solid transparent;
  font-weight: 600;
  text-decoration: none;
  padding: 0.72rem 1.1rem;
  transition: transform 180ms ease, box-shadow 180ms ease, background-color 180ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button--primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow-sm);
}

.button--primary:hover {
  background: var(--color-primary-dark);
  box-shadow: var(--shadow-md);
}

.button--secondary {
  background: #fff;
  color: var(--color-primary-dark);
  border-color: #fff;
}

.hero__media figure,
.hero__media {
  margin: 0;
}

figure {
  margin: 0;
}

figcaption {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  margin-top: var(--space-3);
}

.facts-grid {
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.fact-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
}

.fact-card dt {
  font-weight: 700;
}

.fact-card dd {
  margin: var(--space-2) 0 0;
  color: var(--color-text-muted);
}

.prose p {
  max-width: 68ch;
}

.cards {
  display: grid;
  gap: var(--space-4);
}

.cards--two {
  grid-template-columns: 1fr;
}

.card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: var(--space-5);
}

.flow-grid {
  display: grid;
  gap: var(--space-4);
}

.flow-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-5);
}

.flow-card ol {
  margin: 0;
  padding-left: 1.1rem;
}

.full-bleed-image {
  margin-top: var(--space-6);
  padding: var(--space-4);
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.gallery {
  display: grid;
  gap: var(--space-5);
}

.gallery figure {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
}

.metrics {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.metric {
  background: linear-gradient(180deg, #f8fbff 0%, #edf3ff 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-5);
}

.metric h3 {
  font-size: 2rem;
  color: var(--color-primary-dark);
  margin-bottom: var(--space-2);
}

.design-system {
  display: grid;
  gap: var(--space-4);
}

.footer {
  background: var(--color-primary);
  color: #fff;
}

.footer p {
  max-width: 56ch;
}

.footer__content {
  text-align: center;
}

/* Tablet */
@media (min-width: 720px) {
  .hero {
    grid-template-columns: 1.1fr 0.9fr;
  }

  .facts-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .cards--two {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .flow-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .gallery--two {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .gallery--three {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .design-system {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* Desktop */
@media (min-width: 1024px) {
  .section {
    padding-block: var(--space-8);
  }

  .header__inner {
    padding-block: var(--space-5);
  }

  .nav__list {
    gap: var(--space-5);
  }
}

/* Accessibility: respect reduced-motion preferences */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}