:root {
  --deep: #0c2d57;
  --ocean-1: #0ea5e9;
  --ocean-2: #2563eb;
  --ink: #1e293b;
  --muted: #64748b;
  --line: #e2e8f0;
  --bg: #f8fafc;
  --card: #ffffff;
  --radius: 16px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
}
header.site {
  background: linear-gradient(135deg, #0c2d57 0%, #0ea5e9 60%, #7dd3fc 100%);
  color: #fff;
}
header.site .inner {
  max-width: 760px;
  margin: 0 auto;
  padding: 22px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 0.2px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.brand .logo {
  width: 26px; height: 26px; border-radius: 8px;
  background: rgba(255,255,255,0.9);
}
nav a {
  color: rgba(255,255,255,0.85);
  text-decoration: none;
  margin-left: 18px;
  font-size: 15px;
}
nav a:hover { color: #fff; text-decoration: underline; }
main {
  max-width: 760px;
  margin: 0 auto;
  padding: 40px 24px 64px;
}
.hero { text-align: left; }
.hero h1 {
  font-size: 34px;
  line-height: 1.2;
  margin: 8px 0 12px;
  background: linear-gradient(135deg, var(--deep), var(--ocean-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero p.lead { font-size: 18px; color: var(--muted); margin: 0 0 28px; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 26px;
  margin: 18px 0;
  box-shadow: 0 1px 2px rgba(15,23,42,0.04);
}
.card h2 { font-size: 18px; margin: 0 0 8px; color: var(--deep); }
.card p, .card ul { margin: 6px 0; color: var(--ink); }
.btn {
  display: inline-block;
  background: linear-gradient(135deg, var(--ocean-1), var(--ocean-2));
  color: #fff;
  text-decoration: none;
  padding: 11px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
}
.btn:hover { filter: brightness(1.05); }
article.doc h1 { font-size: 28px; color: var(--deep); margin: 4px 0 6px; }
.meta { color: var(--muted); font-size: 14px; margin-bottom: 26px; }
article.doc h2 { font-size: 19px; color: var(--deep); margin: 30px 0 8px; }
article.doc h3 { font-size: 16px; margin: 20px 0 6px; }
article.doc p, article.doc li { color: #334155; }
article.doc ul, article.doc ol { padding-left: 22px; }
article.doc li { margin: 5px 0; }
footer.site {
  border-top: 1px solid var(--line);
  background: var(--card);
}
footer.site .inner {
  max-width: 760px; margin: 0 auto; padding: 20px 24px;
  display: flex; justify-content: space-between; align-items: center;
  color: var(--muted); font-size: 14px; flex-wrap: wrap; gap: 8px;
}
footer.site a { color: var(--ocean-2); text-decoration: none; }
footer.site a:hover { text-decoration: underline; }