:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #5f6368;
  --accent: #0b5cff;
  --border: #e5e7eb;
  --card: #f8f9fb;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --fg: #e6e6e6;
    --muted: #9aa0a6;
    --accent: #6ea0ff;
    --border: #2a2d33;
    --card: #171a20;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--fg);
  background: var(--bg);
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
header.site {
  border-bottom: 1px solid var(--border);
}
header.site .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding-block: 14px;
}
header.site .brand { font-weight: 700; font-size: 18px; color: var(--fg); }
header.site nav a { margin-left: 18px; color: var(--muted); font-size: 15px; }
header.site nav a:hover { color: var(--fg); }
.wrap { max-width: 860px; margin: 0 auto; padding-inline: 20px; }
main.wrap { padding-block: 40px 60px; }
h1 { font-size: 34px; line-height: 1.2; margin: 0 0 8px; }
h2 { font-size: 22px; margin: 36px 0 10px; }
h3 { font-size: 17px; margin: 24px 0 6px; }
p.meta { color: var(--muted); margin: 0 0 28px; font-size: 14px; }
ul, ol { padding-left: 22px; }
li { margin: 4px 0; }
table { border-collapse: collapse; width: 100%; font-size: 15px; margin: 12px 0; }
th, td { border: 1px solid var(--border); padding: 8px 10px; text-align: left; vertical-align: top; }
th { background: var(--card); }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px 20px;
  margin: 16px 0;
}
.hero { padding-block: 60px 30px; text-align: center; }
.hero h1 { font-size: 42px; }
.hero p { font-size: 18px; color: var(--muted); max-width: 640px; margin: 12px auto 0; }
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin-top: 32px; }
.features .card { margin: 0; }
.features h3 { margin-top: 0; }
.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 10px 20px;
  border-radius: 8px;
  font-weight: 600;
  margin-top: 20px;
}
.btn:hover { text-decoration: none; opacity: .9; }
footer.site {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 14px;
}
footer.site .wrap { padding-block: 20px; display: flex; flex-wrap: wrap; gap: 8px 20px; justify-content: space-between; }
code { background: var(--card); border: 1px solid var(--border); padding: 1px 5px; border-radius: 4px; font-size: 14px; }
@media (max-width: 600px) {
  h1 { font-size: 28px; }
  .hero h1 { font-size: 32px; }
  header.site nav a { margin-left: 12px; }
}