:root {
  color-scheme: light;
  --bg: #f5f7fb;
  --surface: rgba(255, 255, 255, 0.94);
  --text: #15232f;
  --muted: #5b6875;
  --teal: #0f8c85;
  --teal-dark: #1d5660;
  --border: rgba(21, 35, 47, 0.08);
  --shadow: 0 18px 50px rgba(21, 35, 47, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, "Segoe UI", system-ui, sans-serif;
  background:
    radial-gradient(circle at top left, rgba(15, 140, 133, 0.18), transparent 34%),
    radial-gradient(circle at top right, rgba(89, 123, 255, 0.14), transparent 30%),
    var(--bg);
  color: var(--text);
}

.page {
  max-width: 980px;
  margin: 0 auto;
  padding: 40px 20px 72px;
}

.hero {
  padding: 28px;
  border-radius: 28px;
  background: linear-gradient(145deg, #0d8f87, #244e5d);
  color: #fff;
  box-shadow: var(--shadow);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.14);
  font-weight: 700;
}

.hero h1 {
  margin: 18px 0 10px;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.04;
}

.hero p {
  margin: 0;
  max-width: 760px;
  color: rgba(255, 255, 255, 0.9);
  line-height: 1.7;
  font-size: 1.05rem;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 140px;
  padding: 11px 16px;
  border-radius: 999px;
  text-decoration: none;
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.16);
  font-weight: 600;
}

.nav a.active {
  background: #fff;
  color: var(--teal-dark);
}

.content {
  margin-top: 24px;
  padding: 28px;
  border-radius: 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.content h1,
.content h2,
.content h3 {
  line-height: 1.15;
}

.content p,
.content li {
  color: var(--text);
  line-height: 1.75;
}

.content ul {
  padding-left: 1.25rem;
}

.content code {
  background: rgba(15, 140, 133, 0.10);
  padding: 2px 6px;
  border-radius: 6px;
}

.content a {
  color: var(--teal);
}

.callout {
  margin-top: 18px;
  padding: 16px 18px;
  border-radius: 18px;
  background: rgba(15, 140, 133, 0.08);
  color: var(--teal-dark);
}

.footer {
  margin-top: 18px;
  color: var(--muted);
  font-size: 0.95rem;
}

@media (max-width: 640px) {
  .page {
    padding: 24px 14px 48px;
  }

  .hero,
  .content {
    padding: 22px 18px;
    border-radius: 22px;
  }

  .nav a {
    flex: 1 1 100%;
    min-width: 0;
  }
}