:root {
  --primary: #4B6EFA;
  --p-dark: #7C5CFC;
  --accent: #03FDA9;
  --warm: #F0DCC8;
  --soft: #ABC4FF;
  --dark: #111111;
  --text: #333333;
  --muted: #6b7280;
  --line: #e5e7eb;
  --bg: #ffffff;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Instrument Sans', system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.75;
}
a { color: var(--primary); }
.top {
  background: linear-gradient(135deg, #6B8EFF 0%, #4B6EFA 50%, #7C5CFC 100%);
  color: #fff;
  padding: 40px 16px 32px;
}
.top-inner { max-width: 760px; margin: 0 auto; }
.brand {
  display: inline-block;
  font-weight: 700;
  font-size: 14px;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: #fff;
  text-decoration: none;
  opacity: .9;
}
.top h1 {
  font-size: 34px;
  line-height: 1.15;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 14px 0 6px;
}
.top .updated { margin: 0; font-size: 14px; color: #E6ECFF; }
.nav {
  max-width: 760px;
  margin: 0 auto;
  padding: 14px 16px 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.nav a {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1.5px solid var(--primary);
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
}
.nav a.current { background: var(--primary); color: #fff; }
main { max-width: 760px; margin: 0 auto; padding: 24px 16px 64px; }
main h2 {
  font-size: 22px;
  font-weight: 600;
  color: var(--primary);
  margin: 40px 0 10px;
  line-height: 1.3;
}
main h3 { font-size: 17px; font-weight: 600; color: var(--dark); margin: 24px 0 6px; }
main p { margin: 0 0 14px; }
main ul { padding-left: 22px; margin: 0 0 14px; }
main li { margin-bottom: 6px; }
.callout {
  background: #EEF1FF;
  border-left: 4px solid var(--primary);
  border-radius: 10px;
  padding: 14px 18px;
  margin: 18px 0;
}
.callout p:last-child { margin-bottom: 0; }
.warn {
  background: var(--warm);
  border-radius: 10px;
  padding: 14px 18px;
  margin: 18px 0;
  color: var(--primary);
}
.warn p { color: var(--primary); }
.warn p:last-child { margin-bottom: 0; }
table { width: 100%; border-collapse: collapse; margin: 12px 0 20px; font-size: 15px; }
th, td { text-align: left; padding: 10px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--primary); font-weight: 600; }
.toc { list-style: none; padding: 0; margin: 0 0 8px; }
.toc li { margin: 0; }
.toc a { text-decoration: none; }
.toc a:hover { text-decoration: underline; }
.cards { display: grid; gap: 14px; margin-top: 8px; }
.card {
  display: block;
  border: 1.5px solid var(--line);
  border-radius: 14px;
  padding: 18px 20px;
  text-decoration: none;
  color: var(--text);
}
.card:hover { border-color: var(--primary); }
.card strong { display: block; color: var(--primary); font-size: 18px; margin-bottom: 4px; }
footer {
  border-top: 1px solid var(--line);
  padding: 20px 16px 32px;
  font-size: 13px;
  color: var(--muted);
  text-align: center;
}
footer a { color: var(--muted); }
@media (min-width: 640px) {
  .top { padding: 56px 24px 40px; }
  .top h1 { font-size: 40px; }
  main { padding: 28px 24px 80px; }
}