:root {
  --accent: #34b0c3;
  --accent-deep: #0db0c7;
  --navy: #0b1f3a;
  --muted: #64748b;
  --border: #e2e8f0;
  --canvas: #ffffff;
  --subtle: #f8fafc;
  --max: 42rem;
  --font: "Avenir Next", "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

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

html {
  color-scheme: light;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--navy);
  background:
    radial-gradient(1200px 500px at 10% -10%, rgba(52, 176, 195, 0.18), transparent 55%),
    radial-gradient(900px 420px at 100% 0%, rgba(11, 31, 58, 0.08), transparent 50%),
    linear-gradient(180deg, #f4fbfd 0%, var(--canvas) 42%, var(--subtle) 100%);
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--navy);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(12px);
  background: rgba(255, 255, 255, 0.86);
  border-bottom: 1px solid var(--border);
}

.site-header-inner,
.site-footer-inner,
.page,
.hero {
  width: min(100% - 2.5rem, 56rem);
  margin-inline: auto;
}

.site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  padding: 0.9rem 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: inherit;
  text-decoration: none;
}

.brand-mark {
  width: 2.4rem;
  height: auto;
  display: block;
}

.brand-wordmark {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
}

.brand-swim {
  color: var(--navy);
}

.brand-ai {
  color: var(--accent);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  font-size: 0.95rem;
  font-weight: 600;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--navy);
}

.hero {
  padding: 4.5rem 0 2.5rem;
}

.hero-kicker {
  margin: 0 0 0.75rem;
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0 0 0.85rem;
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.hero-lead {
  margin: 0;
  max-width: 34rem;
  color: var(--muted);
  font-size: 1.15rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: 0.65rem 1.15rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 700;
  text-decoration: none;
}

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

.button-primary:hover {
  background: #14325a;
  color: #fff;
}

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

.button-secondary:hover {
  border-color: var(--accent);
  color: var(--navy);
}

.page {
  padding: 2.75rem 0 4rem;
}

.page-header {
  margin-bottom: 2rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}

.page-header h1 {
  margin: 0 0 0.4rem;
  font-size: clamp(1.9rem, 4vw, 2.5rem);
  letter-spacing: -0.03em;
}

.page-meta {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.content {
  max-width: var(--max);
}

.content h2 {
  margin: 2.25rem 0 0.75rem;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.content h3 {
  margin: 1.5rem 0 0.5rem;
  font-size: 1.05rem;
}

.content p,
.content ul {
  margin: 0 0 1rem;
}

.content ul {
  padding-left: 1.2rem;
}

.content li {
  margin-bottom: 0.4rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  gap: 1rem;
  margin: 2rem 0 0;
}

.feature {
  padding: 1.2rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.78);
}

.feature h2 {
  margin: 0 0 0.45rem;
  font-size: 1.05rem;
}

.feature p {
  margin: 0;
  color: var(--muted);
  font-size: 0.98rem;
}

.content code {
  font-size: 0.92em;
  padding: 0.1em 0.35em;
  border-radius: 0.3em;
  background: var(--subtle);
  border: 1px solid var(--border);
}

.site-footer {
  border-top: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.7);
}

.site-footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.5rem 0 2rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1.1rem;
}

.footer-nav a {
  color: var(--muted);
  text-decoration: none;
}

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

@media (max-width: 640px) {
  .site-header-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero {
    padding-top: 3rem;
  }
}