:root {
  --bg: #ffffff; --surface: #f6f8fa; --text: #1f2328; --muted: #59636e; --border: #d1d9e0;
  --accent: #1f6feb; --accent-text: #ffffff; --code: #eff2f5;
  --max: 860px;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0d1117; --surface: #151b23; --text: #e6edf3; --muted: #9198a1; --border: #30363d; --accent: #4493f8; --accent-text: #0d1117; --code: #1f2630; }
}
* { 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(--accent); }
header, main, footer { max-width: var(--max); margin: 0 auto; padding: 0 16px; }
header { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-top: 20px; padding-bottom: 20px; border-bottom: 1px solid var(--border); flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 650; color: var(--text); text-decoration: none; }
.brand img { width: 28px; height: 28px; }
nav { display: flex; gap: 18px; flex-wrap: wrap; font-size: 15px; }
nav a { color: var(--muted); text-decoration: none; }
nav a:hover, nav a[aria-current="page"] { color: var(--text); }
main { padding-top: 32px; padding-bottom: 48px; }
h1 { font-size: 2rem; line-height: 1.25; margin: 0 0 12px; }
h2 { font-size: 1.35rem; margin: 40px 0 8px; padding-top: 8px; }
h3 { font-size: 1.1rem; margin: 28px 0 6px; }
.lead { font-size: 1.15rem; color: var(--muted); margin: 0 0 24px; }
.button { display: inline-block; background: var(--accent); color: var(--accent-text); padding: 10px 18px; border-radius: 8px; text-decoration: none; font-weight: 600; }
.button.secondary { background: transparent; color: var(--accent); border: 1px solid var(--border); }
.actions { display: flex; gap: 12px; flex-wrap: wrap; margin: 8px 0 32px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 18px; }
.card h3 { margin-top: 0; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
code { background: var(--code); padding: 1px 5px; border-radius: 4px; font-size: 0.9em; }
table { border-collapse: collapse; width: 100%; font-size: 15px; display: block; overflow-x: auto; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); vertical-align: top; }
.note { background: var(--surface); border-left: 4px solid var(--accent); padding: 12px 16px; border-radius: 6px; margin: 16px 0; }
.toc { background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 12px 20px; font-size: 15px; }
.toc ol { margin: 6px 0; padding-left: 20px; }
footer { border-top: 1px solid var(--border); padding-top: 20px; padding-bottom: 40px; color: var(--muted); font-size: 14px; display: flex; gap: 18px; flex-wrap: wrap; }
footer a { color: var(--muted); }
.subnav { font-size: 14px; color: var(--muted); margin: 0 0 20px; }
.subnav a { color: var(--muted); }
iframe.form { width: 100%; height: 1150px; border: 1px solid var(--border); border-radius: 10px; background: #fff; }