:root{
  --bg:#f6f7fb;
  --card:#ffffff;
  --text:#1f2937;
  --muted:#6b7280;
  --line:#e5e7eb;
  --link:#1d4ed8;
  --link-hover:#1e40af;
  --max:860px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font:16px/1.7 Georgia, "Times New Roman", serif;
}
.site-header{
  background:#fff;
  border-bottom:1px solid var(--line);
  position:sticky;
  top:0;
  z-index:10;
}
.site-header-inner,
.site-footer-inner,
main{
  width:min(var(--max), calc(100% - 32px));
  margin:0 auto;
}
.site-header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  min-height:64px;
}
.brand{
  font-weight:700;
  font-size:1.2rem;
  color:var(--text);
  text-decoration:none;
}
.nav{
  display:flex;
  flex-wrap:wrap;
  gap:14px;
}
.nav a,
.footer-links a,
a{
  color:var(--link);
  text-decoration:none;
}
.nav a:hover,
.footer-links a:hover,
a:hover{
  color:var(--link-hover);
  text-decoration:underline;
}
main{
  background:var(--card);
  margin-top:24px;
  margin-bottom:24px;
  padding:28px 24px;
  border:1px solid var(--line);
  border-radius:14px;
  box-shadow:0 8px 24px rgba(0,0,0,.04);
}
h1,h2,h3{
  line-height:1.2;
  margin-top:0;
  color:#111827;
}
h1{font-size:2rem;margin-bottom:14px}
h2{font-size:1.35rem;margin-top:28px;margin-bottom:10px}
h3{font-size:1.08rem;margin-top:20px;margin-bottom:8px}
p,ul,ol,table{margin:0 0 16px}
ul,ol{padding-left:22px}
table{
  width:100%;
  border-collapse:collapse;
  background:#fff;
}
th,td{
  border:1px solid var(--line);
  padding:10px;
  text-align:left;
  vertical-align:top;
}
th{background:#f9fafb}
em{color:var(--muted)}
.site-footer{
  border-top:1px solid var(--line);
  background:#fff;
  margin-top:30px;
}
.site-footer-inner{
  padding:18px 0 28px;
}
.footer-links{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  margin-bottom:8px;
}
.footer-note{
  color:var(--muted);
  font-size:.95rem;
}
@media (max-width:640px){
  body{font-size:17px}
  main{padding:22px 16px}
  .site-header-inner{align-items:flex-start;padding:12px 0}
}