:root {
  --bg: #ffffff;
  --text: #16161a;
  --muted: #5f5f6b;
  --line: #e7e7ee;
  --brand: #5b4fe9;
  --card: #f6f6fa;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121216;
    --text: #f2f2f5;
    --muted: #a3a3b0;
    --line: #2a2a33;
    --brand: #8f85ff;
    --card: #1b1b21;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
a { color: var(--brand); }
.wrap { max-width: 720px; margin: 0 auto; padding: 0 20px; }
header { padding: 24px 0; }
header .wrap { display: flex; align-items: center; justify-content: space-between; }
.logo { font-weight: 800; font-size: 24px; letter-spacing: -0.5px; color: var(--text); text-decoration: none; }
.logo span { color: var(--brand); }
nav a { color: var(--muted); text-decoration: none; margin-left: 18px; font-size: 15px; }
nav a:hover { color: var(--text); }
.hero { padding: 64px 0 40px; }
.hero h1 { font-size: clamp(36px, 8vw, 56px); line-height: 1.1; letter-spacing: -1.5px; margin: 0 0 16px; }
.hero p { font-size: 20px; color: var(--muted); margin: 0 0 28px; }
.badge {
  display: inline-block; padding: 10px 18px; border-radius: 999px;
  background: var(--brand); color: #fff; font-weight: 600; font-size: 15px;
}
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; padding: 24px 0 56px; }
.feature { background: var(--card); border-radius: 16px; padding: 20px; }
.feature h3 { margin: 0 0 6px; font-size: 17px; }
.feature p { margin: 0; color: var(--muted); font-size: 15px; }
.doc { padding: 24px 0 56px; }
.doc h1 { font-size: 36px; letter-spacing: -1px; margin: 16px 0 4px; }
.doc .date { color: var(--muted); margin: 0 0 28px; }
.doc h2 { font-size: 21px; margin: 36px 0 8px; }
.doc ul { padding-left: 22px; }
.doc li { margin: 4px 0; }
footer { border-top: 1px solid var(--line); padding: 24px 0 40px; color: var(--muted); font-size: 14px; }
footer a { color: var(--muted); margin-right: 16px; }