*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
:root{--bg:#f5f5f7;--sf:#ffffff;--ink:#1d1d22;--mu:#62626e;--ac:#4a4a5a;--ai:#ffffff;--ln:#e0e0e6;--r:16px;--f:"Songti SC","STSong",SimSun,"Noto Serif CJK SC",Georgia,serif}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--f);line-height:1.75;font-size:16px}
a{color:var(--ac)}img{max-width:100%;height:auto}
.x42fb8-w{max-width:960px;margin:0 auto;padding:0 16px}@media(min-width:640px){.x42fb8-w{padding:0 24px}}
.x42fb8-h{background:var(--sf);border-bottom:1px solid var(--ln)}
.x42fb8-hn{display:flex;align-items:center;gap:16px;min-height:60px;flex-wrap:wrap}
.x42fb8-lg{font-weight:800;font-size:1.05rem;color:var(--ink);text-decoration:none}
.x42fb8-nv{display:flex;gap:4px 16px;flex-wrap:wrap;margin-left:auto}.x42fb8-nv a{color:var(--mu);text-decoration:none;font-size:.92rem}.x42fb8-nv a:hover,.x42fb8-nv a[aria-current]{color:var(--ac)}
.x42fb8-btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:8px 20px;border-radius:var(--r);background:var(--ac);color:var(--ai)!important;font-weight:700;text-decoration:none;font-size:.95rem}
.x42fb8-n-center .x42fb8-hn{flex-direction:column;padding:14px 0;gap:6px}.x42fb8-n-center .x42fb8-nv{margin:0;justify-content:center}
.x42fb8-n-tworow .x42fb8-h{background:var(--ink)}.x42fb8-n-tworow .x42fb8-lg{color:var(--bg)}.x42fb8-n-tworow .x42fb8-hn{min-height:0;padding:12px 0 0;gap:0 16px}.x42fb8-n-tworow .x42fb8-nv{order:3;width:100%;margin:8px 0 0;padding:6px 0 8px;border-top:1px solid rgba(255,255,255,.18)}.x42fb8-n-tworow .x42fb8-nv a{color:var(--bg);opacity:.8}.x42fb8-n-tworow .x42fb8-hn>.x42fb8-btn{margin-left:auto}
.x42fb8-n-pills .x42fb8-hn{flex-direction:column;padding:16px 0;gap:10px}.x42fb8-n-pills .x42fb8-nv{margin:0;justify-content:center}.x42fb8-n-pills .x42fb8-nv a{border:1px solid var(--ln);border-radius:999px;padding:3px 14px;background:var(--bg)}.x42fb8-n-pills .x42fb8-nv a[aria-current]{background:var(--ac);color:var(--ai);border-color:var(--ac)}
@media(min-width:900px){
.x42fb8-n-side .x42fb8-shell,.x42fb8-n-sider .x42fb8-shell{display:grid;grid-template-columns:230px minmax(0,1fr);align-items:start;min-height:100vh;max-width:1200px;margin:0 auto}
.x42fb8-n-sider .x42fb8-shell{grid-template-columns:minmax(0,1fr) 230px}.x42fb8-n-sider .x42fb8-h{order:2}
.x42fb8-n-side .x42fb8-h,.x42fb8-n-sider .x42fb8-h{position:sticky;top:0;min-height:100vh;border-bottom:0;border-right:1px solid var(--ln)}.x42fb8-n-sider .x42fb8-h{border-right:0;border-left:1px solid var(--ln)}
.x42fb8-n-side .x42fb8-hn,.x42fb8-n-sider .x42fb8-hn{flex-direction:column;align-items:flex-start;padding:24px 18px;gap:14px}.x42fb8-n-side .x42fb8-nv,.x42fb8-n-sider .x42fb8-nv{flex-direction:column;margin:0}
.x42fb8-n-side .x42fb8-col .x42fb8-w,.x42fb8-n-sider .x42fb8-col .x42fb8-w{max-width:none;margin:0}}
.x42fb8-hero{padding:34px 0 8px}.x42fb8-hero h1{font-size:clamp(1.55rem,4.6vw,2.3rem);line-height:1.3;margin:0 0 12px}.x42fb8-hero .x42fb8-lead{color:var(--mu);margin:0 0 6px;max-width:46em}
.x42fb8-hr-band{background:var(--ac);color:var(--ai);padding:34px 0 30px}.x42fb8-hr-band .x42fb8-lead{color:inherit;opacity:.92}
.x42fb8-hbox{background:var(--sf);border:1px solid var(--ln);border-radius:calc(var(--r) + 4px);padding:24px 22px}
.x42fb8-hsp{display:grid;gap:14px 28px;align-items:start}@media(min-width:760px){.x42fb8-hsp{grid-template-columns:1.2fr 1fr}}.x42fb8-hsp .x42fb8-lead{background:var(--sf);border:1px solid var(--ln);border-radius:var(--r);padding:12px 14px;margin:0}
.x42fb8-hr-mini{padding:20px 0 0}.x42fb8-hr-mini h1{font-size:1.4rem;margin:0 0 6px}.x42fb8-hr-mini .x42fb8-lead{font-size:.95rem}
main .x42fb8-sec{padding:18px 0}main h2{font-size:1.3rem;margin:0 0 10px;line-height:1.4}main h3{font-size:1.05rem;margin:18px 0 6px}
main p{margin:0 0 12px}main ul,main ol{padding-left:1.3em;margin:0 0 12px}
pre{background:var(--sf);border:1px solid var(--ln);border-radius:var(--r);padding:12px;overflow:auto;font-size:.86rem}
code{background:var(--sf);border:1px solid var(--ln);border-radius:4px;padding:0 4px}pre code{border:0;padding:0}
blockquote{margin:0 0 12px;border-left:4px solid var(--ac);padding:2px 14px;color:var(--mu);background:var(--sf)}
.sk-table{overflow-x:auto;margin:6px 0 16px;border-radius:var(--r)}table{border-collapse:collapse;width:100%;min-width:520px;background:var(--sf);font-size:.93rem}
th,td{padding:10px 12px;text-align:left;vertical-align:top}th{background:var(--ac);color:var(--ai);font-weight:700;white-space:nowrap}
.x42fb8-t-stripe td{border-bottom:1px solid var(--ln)}.x42fb8-t-stripe tbody tr:nth-child(even) td{background:var(--bg)}
.x42fb8-t-line td{border-bottom:1px solid var(--ln)}.x42fb8-t-line th{background:transparent;color:var(--ink);border-bottom:2px solid var(--ac)}
.x42fb8-t-box th,.x42fb8-t-box td{border:1px solid var(--ln)}
details{background:var(--sf);border:1px solid var(--ln);border-radius:var(--r);padding:0 16px;margin:0 0 10px}
summary{cursor:pointer;font-weight:700;padding:12px 0;list-style:none}summary::-webkit-details-marker{display:none}summary:after{content:"+";float:right;color:var(--ac)}details[open] summary:after{content:"\2212"}
details>div{padding:0 0 12px}
.x42fb8-cta{margin:26px 0;padding:22px;background:var(--sf);border:1px solid var(--ln);border-radius:calc(var(--r) + 4px);text-align:center}.x42fb8-cta p{margin:0 0 12px;color:var(--mu)}
.x42fb8-toc{margin:14px 0 4px;padding:12px 16px;background:var(--sf);border:1px solid var(--ln);border-radius:var(--r)}.x42fb8-toc p{margin:0 0 6px;font-weight:700}.x42fb8-toc ul{margin:0;padding-left:1.2em}
.x42fb8-f{margin-top:30px;border-top:1px solid var(--ln);background:var(--sf);padding:22px 0;color:var(--mu);font-size:.88rem}.x42fb8-f p{margin:0 0 6px}.x42fb8-f a{color:var(--mu)}
.x42fb8-f-center .x42fb8-f{text-align:center}.x42fb8-f-card .x42fb8-f{background:transparent;border:0;padding:0}.x42fb8-f-card .x42fb8-fbox{background:var(--sf);border:1px solid var(--ln);border-radius:calc(var(--r) + 4px);padding:18px 20px}
.x42fb8-f-cols .x42fb8-fg{display:grid;gap:10px 30px}@media(min-width:720px){.x42fb8-f-cols .x42fb8-fg{grid-template-columns:2fr 1fr}}
.x42fb8-bw{position:relative;overflow:hidden;margin:18px 0;padding:14px 0;border-radius:var(--r);isolation:isolate}.x42fb8-bw::before{content:"";position:absolute;inset:-40px;background:var(--bgimg) center/cover no-repeat;filter:blur(24px) brightness(.82) saturate(.75);z-index:-1}
.x42fb8-crumb{font-size:.85rem;color:var(--mu);padding-top:14px}.x42fb8-crumb a{color:var(--mu)}
@media(max-width:600px){.x42fb8-nv{margin-left:0;width:100%}.x42fb8-hero{padding-top:24px}}