*{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#F5F7FA;
  --panel:#FFFFFF;
  --panel-2:#EEF2F6;
  --line:#D3DCE6;
  --line-soft:#E2E8EF;
  --text:#0E1C2B;
  --muted:#4D5E71;
  --dim:#7A8899;
  --primary:#1B3A5C;
  --primary-2:#27507D;
  --ice:#E3ECF5;
  --ice-2:#C9D9EA;
  --accent:#E5484D;
  --accent-ink:#C8343A;
  --accent-soft:#FDECEC;
  --code-bg:#0F1F31;
  --code-fg:#E4EEF7;
  --code-key:#9CC3E6;
  --radius:10px;
  --mono:"SFMono-Regular","Menlo","Consolas","Liberation Mono",monospace;
  --body:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
}
html{scroll-behavior:smooth}
body{
  font-family:var(--body);
  background:var(--bg);
  color:var(--text);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
:focus-visible{outline:2px solid var(--primary);outline-offset:3px}
section[id]{scroll-margin-top:84px}
.shell{width:min(1180px,calc(100% - 40px));margin:0 auto}
.nav{
  position:sticky;
  top:0;
  z-index:10;
  background:rgba(245,247,250,0.9);
  border-bottom:1px solid var(--line-soft);
  backdrop-filter:blur(18px);
  -webkit-backdrop-filter:blur(18px);
}
.nav-inner{
  height:70px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
}
.brand{display:flex;align-items:center;min-width:max-content}
.brand img{height:28px;width:auto}
.nav-links{
  display:flex;
  align-items:center;
  gap:22px;
  color:var(--muted);
  font-size:0.92rem;
  white-space:nowrap;
}
.nav-links a:hover{color:var(--text)}
.nav-actions{display:flex;align-items:center;gap:10px}
.nav-actions .btn-plain{gap:0}
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:44px;
  padding:0 20px;
  border-radius:8px;
  border:1px solid transparent;
  font-weight:700;
  cursor:pointer;
  transition:background-color .2s,border-color .2s,color .2s;
}
.btn-primary{background:var(--primary);color:#fff;border-color:var(--primary)}
.btn-primary:hover{background:var(--primary-2);border-color:var(--primary-2)}
.btn-dark{background:var(--panel);color:var(--text);border-color:var(--line)}
.btn-dark:hover{border-color:var(--primary)}
.btn-plain{border-color:var(--line);color:var(--text);background:transparent}
.btn-plain:hover{border-color:var(--primary)}
.btn-sm{min-height:40px;padding:0 14px;font-size:0.9rem}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:6px 12px;
  border:1px solid var(--line);
  border-radius:999px;
  color:var(--muted);
  background:var(--panel);
  font-size:0.84rem;
  font-weight:700;
  margin-bottom:22px;
}
.dot{width:8px;height:8px;border-radius:999px;background:var(--accent)}
.disclaimer{color:var(--dim);font-size:0.84rem;line-height:1.7}
footer{border-top:1px solid var(--line-soft);padding:36px 0 40px;color:var(--dim);background:var(--panel)}
.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:18px}
.footer-links{display:flex;gap:18px;flex-wrap:wrap}
.footer-links a:hover{color:var(--text)}
.footer-legal{margin-top:20px;padding-top:18px;border-top:1px solid var(--line-soft)}

/* ===== 落地页（/site/page.css，2026-09-30）：沿用首页变量和导航，补文章排版 ===== */
.crumbs{font-size:.86rem;color:var(--dim);padding:22px 0 0}
.crumbs a{color:var(--muted)}.crumbs a:hover{color:var(--text)}
.crumbs span{margin:0 6px;color:var(--line)}
.page-hero{padding:28px 0 26px;border-bottom:1px solid var(--line-soft)}
.page-hero h1{font-size:clamp(1.9rem,4.2vw,3rem);line-height:1.15;letter-spacing:-.01em;font-weight:800;margin:14px 0 14px;max-width:880px}
.page-hero .lead{font-size:1.08rem;color:var(--muted);max-width:820px}
.page-hero .hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}
.updated{font-size:.84rem;color:var(--dim);margin-top:14px}
.layout{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:48px;padding:36px 0 64px}
.prose{min-width:0}
.prose h2{font-size:1.5rem;line-height:1.3;margin:40px 0 14px;font-weight:800}
.prose h2:first-child{margin-top:0}
.prose h3{font-size:1.15rem;margin:26px 0 10px;font-weight:700}
.prose p{margin:0 0 14px;color:#243446}
.prose ul,.prose ol{margin:0 0 16px 1.3em;color:#243446}
.prose li{margin:4px 0}
.prose a{color:var(--primary-2);border-bottom:1px solid var(--ice-2)}
.prose a:hover{border-bottom-color:var(--primary)}
.prose strong{color:var(--text)}
.prose code{font-family:var(--mono);font-size:.88em;background:var(--panel-2);padding:2px 6px;border-radius:5px;color:var(--primary);overflow-wrap:anywhere}
.prose pre{background:var(--code-bg);color:var(--code-fg);border-radius:var(--radius);padding:16px 18px;overflow-x:auto;margin:0 0 18px;font-family:var(--mono);font-size:.86rem;line-height:1.65}
.prose pre code{background:none;color:inherit;padding:0;font-size:inherit}
.answer{background:var(--panel);border:1px solid var(--line);border-left:4px solid var(--primary);border-radius:var(--radius);padding:16px 18px;margin:0 0 26px}
.answer p{margin:0;color:var(--text)}
.table-wrap{overflow-x:auto;margin:0 0 20px;border:1px solid var(--line);border-radius:var(--radius);background:var(--panel)}
.prose table{border-collapse:collapse;width:100%;font-size:.88rem}
.prose th,.prose td{padding:9px 12px;border-bottom:1px solid var(--line-soft);text-align:left;vertical-align:top}
.prose th{background:var(--panel-2);font-weight:700;min-width:6em}
.prose td{min-width:4.5em}
.prose td code,.prose td a{white-space:nowrap;overflow-wrap:normal}
.prose tr:last-child td{border-bottom:none}
.note{background:var(--accent-soft);border-radius:var(--radius);padding:12px 16px;margin:0 0 18px;font-size:.92rem;color:#5b2326}
.faq details{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);margin:0 0 10px;padding:0 16px}
.faq summary{cursor:pointer;padding:14px 0;font-weight:700;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";float:right;color:var(--dim)}
.faq details[open] summary::after{content:"−"}
.faq details p{padding:0 0 14px;margin:0}
aside.side{position:sticky;top:94px;align-self:start;display:grid;gap:16px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:18px}
.card h2,.card h3{font-size:1rem;margin:0 0 10px}
.card p{font-size:.9rem;color:var(--muted);margin:0 0 12px}
.card ul{list-style:none;margin:0;padding:0}
.card li{margin:6px 0;font-size:.92rem}
.card li a{color:var(--primary-2)}
.card .btn{width:100%}
.related{padding:0 0 56px}
.related h2{font-size:1.2rem;margin:0 0 14px}
.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px}
.related-grid a{display:block;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px}
.related-grid a:hover{border-color:var(--primary)}
.related-grid b{display:block;font-size:.98rem;margin-bottom:4px}
.related-grid span{font-size:.86rem;color:var(--muted)}
@media(max-width:980px){.layout{grid-template-columns:1fr;gap:28px}aside.side{position:static}.nav-links{display:none}}
@media(max-width:760px){.shell{width:min(100% - 28px,1180px)}.nav-inner{height:62px;gap:12px}.brand img{height:22px}.footer-inner{flex-direction:column;align-items:flex-start}.prose h2{font-size:1.3rem}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.btn{transition:none}}