:root {
  --teal-950: #123b3a;
  --teal-900: #184b49;
  --teal-800: #1f5d59;
  --teal-100: #dcebe7;
  --teal-50: #edf6f3;
  --coral-600: #d1654f;
  --coral-100: #f7ddd7;
  --surface-page: #eef1ec;
  --surface-panel: #ffffff;
  --surface-muted: #f5f7f3;
  --border-soft: #dfe5dc;
  --text-primary: #1c302f;
  --text-secondary: #5f706e;
  --text-on-brand: #ffffff;
  --focus-ring: #e3a935;
  --radius-sm: 7px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --shadow-md: 0 12px 32px rgb(24 52 50 / 10%);
  --shadow-lg: 0 24px 64px rgb(8 24 24 / 22%);
  --font-sans:
    "Inter Variable", Inter, "Aptos", ui-sans-serif, system-ui, -apple-system,
    BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--surface-page);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: var(--teal-800);
}

a:focus-visible,
.btn:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 32px;
  background: rgb(255 255 255 / 92%);
  border-bottom: 1px solid var(--border-soft);
  backdrop-filter: blur(8px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--teal-950);
  font-weight: 700;
  font-size: 20px;
}

.brand-mark {
  width: 32px;
  height: 32px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 15px;
}

.nav-link:hover {
  color: var(--teal-900);
}

/* Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 20px;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition:
    transform 0.08s ease,
    box-shadow 0.15s ease,
    background-color 0.15s ease;
}

.btn-primary {
  background: var(--teal-900);
  color: var(--text-on-brand);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  background: var(--teal-800);
  transform: translateY(-1px);
}

.btn-small {
  padding: 9px 14px;
  font-size: 14px;
}

.btn-download {
  padding: 16px 28px;
  font-size: 18px;
  text-align: left;
}

.btn-download small {
  display: block;
  font-weight: 400;
  font-size: 13px;
  opacity: 0.85;
}

.btn-download-icon {
  flex: none;
}

/* Hero */

.hero {
  display: flex;
  justify-content: center;
  padding: 72px 24px 64px;
  background:
    radial-gradient(
      1200px 480px at 50% -10%,
      var(--teal-100) 0%,
      rgb(220 235 231 / 0%) 60%
    ),
    var(--surface-page);
}

.hero-inner {
  max-width: 720px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-mark {
  width: 112px;
  height: 112px;
  margin-bottom: 20px;
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--teal-800);
}

h1 {
  margin: 0;
  font-size: clamp(44px, 7vw, 72px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--teal-950);
}

.tagline {
  margin: 18px 0 0;
  font-size: clamp(20px, 3vw, 26px);
  line-height: 1.3;
  font-weight: 600;
  color: var(--teal-900);
}

.hero-sub {
  margin: 16px 0 0;
  max-width: 560px;
  color: var(--text-secondary);
}

.download-card {
  margin-top: 36px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.download-meta {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

.badge {
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--surface-panel);
  border: 1px solid var(--border-soft);
  font-size: 13px;
  font-weight: 600;
  color: var(--teal-900);
}

.badge-muted {
  color: var(--text-secondary);
  font-weight: 500;
}

.note {
  margin-top: 28px;
  max-width: 560px;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  background: var(--surface-muted);
  border: 1px solid var(--border-soft);
  text-align: left;
}

.note p {
  margin: 0;
  font-size: 14px;
  color: var(--text-secondary);
}

/* Sections */

.section {
  padding: 64px 24px;
}

.section-alt {
  background: var(--teal-950);
  color: #e8f1ee;
}

.section-alt h2 {
  color: #ffffff;
}

.section-inner {
  max-width: 1080px;
  margin: 0 auto;
}

.section-narrow {
  max-width: 720px;
}

.section h2 {
  margin: 0 0 12px;
  font-size: clamp(26px, 3.4vw, 36px);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--teal-950);
}

.section-lede {
  margin: 0 0 36px;
  max-width: 620px;
  color: var(--text-secondary);
  font-size: 18px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.card {
  padding: 26px 26px 22px;
  background: var(--surface-panel);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.card h3 {
  margin: 0 0 8px;
  font-size: 19px;
  color: var(--teal-900);
}

.card p {
  margin: 0;
  font-size: 15px;
  color: var(--text-secondary);
}

.card-wide {
  grid-column: 1 / -1;
}

.pilot-list {
  margin: 0;
  padding-left: 22px;
  display: grid;
  gap: 14px;
  font-size: 16px;
}

.pilot-list strong {
  color: #ffffff;
}

.section-alt .pilot-list {
  color: #d6e4df;
}

/* Footer */

.site-footer {
  border-top: 1px solid var(--border-soft);
  background: var(--surface-page);
}

.footer-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 28px 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px 32px;
}

.footer-brand {
  margin: 0;
  font-weight: 700;
  color: var(--teal-950);
}

.footer-nav {
  display: flex;
  gap: 20px;
}

.footer-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
}

.footer-nav a:hover {
  color: var(--teal-900);
}

.footer-copy {
  margin: 0 0 0 auto;
  color: var(--text-tertiary);
  font-size: 13px;
}

/* Prose pages */

.prose h1 {
  font-size: clamp(32px, 4vw, 44px);
  margin: 0 0 20px;
}

.prose h2 {
  font-size: 22px;
  margin: 28px 0 10px;
}

.prose p,
.prose ul {
  color: var(--text-secondary);
}

.prose ul {
  padding-left: 22px;
}

.prose li {
  margin-bottom: 8px;
}

/* Responsive */

@media (max-width: 720px) {
  .site-header {
    padding: 12px 18px;
  }

  .site-nav .nav-link {
    display: none;
  }

  .hero {
    padding: 48px 18px 44px;
  }

  .section {
    padding: 48px 18px;
  }

  .footer-copy {
    margin-left: 0;
    width: 100%;
  }

  .btn-download {
    font-size: 16px;
    padding: 14px 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .btn-primary {
    transition: none;
  }
}