:root {
  --bg: #0a1628;
  --surface: #ffffff;
  --text: #1a1f2e;
  --muted: #5a6478;
  --accent: #ff7a45;
  --border: #e6e9ef;
  --max: 760px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: #f7f8fb;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

header.site {
  background: var(--bg);
  color: #fff;
  padding: 28px 24px;
  text-align: center;
}

header.site .brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
}

header.site img {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.05);
  object-fit: cover;
}

header.site h1 {
  margin: 0;
  font-size: 24px;
  letter-spacing: 0.5px;
}

header.site .tag {
  margin: 8px 0 0;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
}

main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 40px 24px 80px;
  background: var(--surface);
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
  min-height: calc(100vh - 200px);
}

main h1 {
  font-size: 30px;
  margin: 0 0 8px;
}

main h2 {
  font-size: 20px;
  margin: 32px 0 8px;
  color: var(--text);
}

main h3 {
  font-size: 16px;
  margin: 20px 0 6px;
  color: var(--text);
}

main p, main li {
  font-size: 16px;
  color: var(--text);
}

main ul, main ol { padding-left: 22px; }
main li { margin: 6px 0; }

main .updated {
  color: var(--muted);
  font-size: 14px;
  margin: 0 0 24px;
}

main .lead {
  font-size: 17px;
  color: var(--muted);
  margin: 0 0 28px;
}

main .nav-cards {
  display: grid;
  gap: 12px;
  margin-top: 20px;
}

main .nav-cards a {
  display: block;
  padding: 18px 20px;
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text);
  background: #fafbfd;
  transition: border-color 0.15s, transform 0.15s;
}

main .nav-cards a:hover {
  border-color: var(--accent);
  text-decoration: none;
  transform: translateY(-1px);
}

main .nav-cards a strong {
  display: block;
  font-size: 16px;
  margin-bottom: 2px;
}

main .nav-cards a span {
  color: var(--muted);
  font-size: 14px;
}

footer.site {
  text-align: center;
  padding: 24px;
  color: var(--muted);
  font-size: 13px;
}