:root {
  --brand: #35826e;
  --brand-deep: #184d41;
  --ink: #1c1c1e;
  --muted: #5c6662;
  --line: #e3e6e4;
  --surface: #ffffff;
  --bg: #f7f8f7;
  --radius: 16px;
  --max: 720px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f2f2f7;
    --muted: #a1a8a5;
    --line: #2a2e2c;
    --surface: #161918;
    --bg: #0d0f0e;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
header {
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-deep) 100%);
  color: #fff;
  padding: 44px 0 40px;
}

header h1 {
  margin: 0 0 8px;
  font-size: 2.1rem;
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 700;
}

header p {
  margin: 0;
  font-size: 1.08rem;
  opacity: 0.92;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  background: var(--surface);
  position: sticky;
  top: 0;
  z-index: 10;
}

nav .wrap { display: flex; flex-wrap: wrap; gap: 18px; }

nav a {
  color: var(--brand);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
}

nav a:hover, nav a:focus { text-decoration: underline; }

main { padding: 40px 0 64px; }

h2 {
  font-size: 1.3rem;
  margin: 36px 0 12px;
  letter-spacing: -0.01em;
}

h2:first-of-type { margin-top: 0; }

h3 {
  font-size: 1.05rem;
  margin: 24px 0 8px;
}

p { margin: 0 0 14px; }

ul { margin: 0 0 16px; padding-left: 22px; }

li { margin-bottom: 7px; }

a { color: var(--brand); }

.updated {
  color: var(--muted);
  font-size: 0.88rem;
  margin: -6px 0 22px;
}

/* Landing page */
.hero { margin-bottom: 36px; }

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  margin-bottom: 16px;
}

.card h3 { margin-top: 0; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin-bottom: 16px;
}

.badge {
  display: inline-block;
  background: rgba(53, 130, 110, 0.12);
  color: var(--brand);
  border-radius: 999px;
  padding: 3px 11px;
  font-size: 0.78rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.cta {
  display: inline-block;
  background: var(--brand);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  padding: 12px 24px;
  border-radius: 999px;
  margin: 6px 0 4px;
}

.cta:hover, .cta:focus { background: var(--brand-deep); }

footer {
  border-top: 1px solid var(--line);
  padding: 24px 0 40px;
  color: var(--muted);
  font-size: 0.88rem;
}

footer a { color: var(--muted); }