:root {
  --bg: #f5f6fa;
  --surface: #ffffff;
  --text: #14161f;
  --muted: #565b6e;
  --border: #dfe2ec;
  --primary: #4f46e5;
  --primary-text: #ffffff;
  --soft: #eceefa;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1118;
    --surface: #171b26;
    --text: #eef0f7;
    --muted: #a3a9bd;
    --border: #2a3042;
    --primary: #8b85ff;
    --primary-text: #0e1118;
    --soft: #1f2433;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", sans-serif;
}
a { color: var(--primary); }
.wrap { max-width: 980px; margin: 0 auto; padding: 0 20px; }
header.site { padding: 18px 0; border-bottom: 1px solid var(--border); background: var(--surface); }
header.site .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 12px; color: var(--text); text-decoration: none; font-weight: 700; font-size: 20px; }
.brand img { width: 40px; height: 40px; border-radius: 10px; }
nav a { margin-inline-start: 18px; color: var(--muted); text-decoration: none; font-weight: 600; }
nav a:hover, nav a[aria-current="page"] { color: var(--primary); }
.hero { padding: 64px 0 48px; text-align: center; }
.hero img.logo { width: 112px; height: 112px; border-radius: 26px; box-shadow: 0 8px 28px rgba(79, 70, 229, 0.25); }
.hero h1 { font-size: clamp(34px, 6vw, 52px); line-height: 1.15; margin: 24px 0 12px; }
.hero p.lead { max-width: 620px; margin: 0 auto 28px; color: var(--muted); font-size: 20px; }
.btn { display: inline-block; padding: 14px 28px; border-radius: 999px; background: var(--primary); color: var(--primary-text); font-weight: 700; text-decoration: none; }
.btn.secondary { background: var(--soft); color: var(--text); }
.btn.disabled { background: var(--soft); color: var(--muted); cursor: default; }
.actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
section { padding: 36px 0; }
section h2 { font-size: 28px; margin: 0 0 20px; }
.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 22px; padding: 22px; }
.card h3 { margin: 0 0 6px; font-size: 19px; }
.card p { margin: 0; color: var(--muted); font-size: 16px; }
.banner { background: var(--soft); border-radius: 26px; padding: 28px; }
.banner h2 { margin-top: 0; }
article.doc { background: var(--surface); border: 1px solid var(--border); border-radius: 26px; padding: 28px clamp(18px, 4vw, 40px); margin: 36px 0; }
article.doc h1 { margin-top: 0; font-size: clamp(28px, 5vw, 38px); line-height: 1.2; }
article.doc h2 { margin-top: 32px; font-size: 22px; }
article.doc .meta { color: var(--muted); }
article.doc table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 15px; }
article.doc th, article.doc td { border: 1px solid var(--border); padding: 10px 12px; text-align: start; vertical-align: top; }
article.doc th { background: var(--soft); }
.table-scroll { overflow-x: auto; }
footer.site { padding: 32px 0 48px; border-top: 1px solid var(--border); color: var(--muted); font-size: 15px; }
footer.site .wrap { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
footer.site a { color: var(--muted); margin-inline-end: 16px; }