*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.75 var(--font);-webkit-font-smoothing:antialiased;overflow-wrap:anywhere}
img,svg{max-width:100%}
a{color:var(--link);text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:var(--link-h)}
:focus-visible{outline:3px solid var(--focus);outline-offset:2px;border-radius:4px}
h1,h2,h3,h4{font-family:var(--font-head);line-height:1.3;margin:0;color:var(--ink-strong,var(--ink))}
p{margin:0 0 1em}
code{font:.9em/1.4 var(--mono);background:var(--code-bg);padding:.1em .35em;border-radius:4px}
pre{background:var(--pre-bg);color:var(--pre-ink);padding:14px 16px;border-radius:var(--radius-s);overflow:auto;font:13.5px/1.6 var(--mono);margin:0 0 1.2em}
pre code{background:none;padding:0;color:inherit}
.wrap{width:min(1180px,100% - 32px);margin-inline:auto}
main,article,aside{min-width:0}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:.55em 1.1em;border-radius:var(--radius-btn);font-weight:700;text-decoration:none;border:2px solid transparent;cursor:pointer;font-family:inherit;font-size:.95rem;line-height:1.3}
.btn-aff{background:var(--cta);color:var(--cta-ink);border-color:var(--cta-line,var(--cta))}
.btn-aff:hover{background:var(--cta-h);color:var(--cta-ink)}
.btn-lg{font-size:1.05rem;padding:.75em 1.6em}
.bc-disc{font-size:.78rem;color:var(--muted)}
.crumbs{font-size:.85rem;color:var(--muted);margin:0 0 14px;display:flex;flex-wrap:wrap;gap:2px 0}
.crumbs a{color:var(--muted)}
.crumbs i{font-style:normal;margin:0 .5em;opacity:.6}
.lst{margin:0 0 1.1em;padding-left:1.35em}
.lst li{margin:.3em 0}
.note{display:flex;gap:10px;align-items:flex-start;padding:12px 14px;border-radius:var(--radius-s);margin:0 0 1.2em;background:var(--note-bg);border:1px solid var(--line);font-size:.95rem}
.note strong{flex:none;font-size:.78rem;padding:.15em .6em;border-radius:99px;background:var(--primary);color:var(--primary-ink);line-height:1.6;margin-top:.15em}
.note-warn strong{background:var(--warn);color:var(--warn-ink)}
.note-ok strong{background:var(--ok);color:var(--ok-ink)}
.note-ad strong{background:var(--muted);color:var(--bg)}
.keybox{margin:0 0 1.4em;padding:14px 16px;border-radius:var(--radius);background:var(--key-bg);border:1px solid var(--line)}
.keybox-label{display:inline-block;font-size:.78rem;font-weight:800;letter-spacing:.05em;color:var(--primary);margin-bottom:4px}
.keybox p{margin:0;font-size:1.02rem}
.tbl-wrap{overflow-x:auto;margin:0 0 1.4em;border:1px solid var(--line);border-radius:var(--radius-s);background:var(--surface)}
.tbl{width:100%;border-collapse:collapse;font-size:.92rem;min-width:520px}
.tbl th,.tbl td{padding:9px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.tbl thead th{background:var(--thead-bg);font-weight:800;white-space:nowrap}
.tbl tbody th{font-weight:700;white-space:nowrap}
.tbl.wide{min-width:940px}
.tbl tr:last-child th,.tbl tr:last-child td{border-bottom:0}
.faq{margin:1.8em 0 1em}
.faq h2{margin-bottom:12px}
.faq details{border:1px solid var(--line);border-radius:var(--radius-s);background:var(--surface);margin:0 0 8px;padding:0 14px}
.faq summary{cursor:pointer;font-weight:700;padding:12px 0;list-style-position:outside}
.faq details[open] summary{color:var(--primary)}
.faq details p{margin:0 0 12px;color:var(--ink)}
.steps{list-style:none;counter-reset:st;margin:0 0 1.4em;padding:0}
.steps>li{counter-increment:st;position:relative;padding:0 0 18px 54px;margin:0}
.steps>li::before{content:counter(st);position:absolute;left:0;top:0;width:38px;height:38px;border-radius:50%;background:var(--step-bg);color:var(--step-ink);display:grid;place-items:center;font-weight:800;font-family:var(--font-head)}
.steps>li:not(:last-child)::after{content:"";position:absolute;left:18px;top:42px;bottom:4px;width:2px;background:var(--line)}
.step-t{font-size:1.06rem;margin:4px 0 4px}
.step-note{font-size:.9rem;color:var(--muted)}
.linkcards{list-style:none;margin:0 0 1.4em;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:10px}
.linkcards li{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-s);padding:12px 14px;display:flex;flex-direction:column;gap:2px}
.linkcards li>a{font-weight:800;text-decoration:none}
.linkcards li>span{font-size:.88rem;color:var(--muted)}
.chips{list-style:none;padding:0;margin:0 0 1.2em;display:flex;flex-wrap:wrap;gap:8px}
.chips li{padding:.2em .8em;border-radius:99px;background:var(--chip-bg);border:1px solid var(--line);font-size:.86rem}
.cross{margin:1.4em 0;padding:12px 14px;border-left:4px solid var(--accent);background:var(--cross-bg);border-radius:0 var(--radius-s) var(--radius-s) 0;font-size:.98rem}
.cross-lead{color:var(--muted);margin-right:.5em}
.cross a{font-weight:800}
.ctabox{margin:1.4em 0;padding:18px;border-radius:var(--radius);background:var(--surface);border:1px solid var(--line);display:flex;flex-wrap:wrap;gap:10px 16px;align-items:center}
.ctabox-t{margin:0;font-weight:700;flex:1 1 240px}
.bc-list{display:grid;gap:16px;margin:0 0 1.6em}
.bc{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px}
.bc-head{display:flex;align-items:center;flex-wrap:wrap;gap:8px 10px;margin-bottom:6px}
.bc-name{font-size:1.2rem;margin:0}
.bc-name small{font-size:.75em;font-weight:400;color:var(--muted)}
.bc-rank{display:inline-grid;place-items:center;min-width:30px;height:30px;padding:0 6px;border-radius:8px;background:var(--rank-bg);color:var(--rank-ink);font-weight:800;font-family:var(--font-head)}
.bc-badge{font-size:.76rem;font-weight:800;padding:.1em .7em;border-radius:99px;background:var(--gold);color:var(--gold-ink)}
.bc-tag{margin:0 0 .6em;color:var(--ink)}
.bc-why{margin:0 0 .6em;font-size:.95rem;background:var(--key-bg);padding:8px 10px;border-radius:var(--radius-s)}
.bc-why b,.bc-fit b,.bc-warn b{color:var(--primary);margin-right:.5em;font-size:.82rem}
.bc-specs{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:6px 18px;margin:0 0 .7em}
.bc-specs div{min-width:0}
.bc-specs dt{font-size:.76rem;color:var(--muted);font-weight:700}
.bc-specs dd{margin:0;font-size:.92rem}
.bc-empty{margin:0 0 .7em;padding:8px 10px;border-radius:var(--radius-s);background:var(--note-bg);font-size:.92rem;color:var(--muted)}
.bc-fit,.bc-warn{margin:0 0 .5em;font-size:.92rem}
.bc-warn{color:var(--muted)}
.bc-foot{display:flex;flex-wrap:wrap;align-items:center;gap:8px 12px;margin-top:10px;padding-top:10px;border-top:1px dashed var(--line)}
.bc-src{font-size:.78rem;color:var(--muted);flex:1 1 220px}
.bc.is-top{border:2px solid var(--gold);background:var(--top-bg);box-shadow:var(--top-shadow)}
.bc.is-top .bc-name{font-size:1.4rem}
.bc.is-top .btn-aff{padding:.7em 1.5em;font-size:1.05rem}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
.theme-btn,.nav-btn{border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:var(--radius-btn);padding:.4em .75em;cursor:pointer;font:inherit;font-size:.86rem}
.nav-btn{display:none}
.toc{list-style:none;margin:0;padding:0}
.toc a{display:block;padding:5px 10px;border-left:2px solid var(--line);color:var(--muted);text-decoration:none;font-size:.9rem}
.toc a.on,.toc a:hover{color:var(--primary);border-left-color:var(--primary)}
.foot-disc{font-size:.82rem;color:var(--muted);line-height:1.7}
@media(max-width:820px){.nav-btn{display:inline-block}.bc-head .bc-name{font-size:1.1rem}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}

:root{--font:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",system-ui,sans-serif;--font-head:"Source Han Serif SC","Noto Serif CJK SC","Songti SC","STSong","SimSun",serif;--mono:ui-monospace,SFMono-Regular,Consolas,monospace;
--bg:#f6f5ff;--surface:#fff;--ink:#231f52;--ink-strong:#150f45;--muted:#6a6796;--line:#dcd8f4;--primary:#5237e8;--primary-ink:#fff;--accent:#0a9db8;--link:#4a30d6;--link-h:#2f1aa8;--focus:#0a9db8;
--cta:#5237e8;--cta-h:#3f27c4;--cta-ink:#fff;--gold:#ffb52e;--gold-ink:#3a2600;--top-bg:#fff;--top-shadow:none;--code-bg:#ebe8ff;--pre-bg:#1a1640;--pre-ink:#e9e6ff;--note-bg:#f0eeff;--key-bg:#efeaff;--thead-bg:#ebe8ff;--chip-bg:#fff;--cross-bg:#e6f8fc;--step-bg:#5237e8;--step-ink:#fff;--rank-bg:#5237e8;--rank-ink:#fff;
--ok:#0c8c6a;--ok-ink:#fff;--warn:#ffb52e;--warn-ink:#3a2600;--radius:14px;--radius-s:10px;--radius-btn:99px}
[data-theme=dark]{--bg:#0a0920;--surface:#14123a;--ink:#e7e4ff;--ink-strong:#fff;--muted:#a19dd3;--line:#2b2766;--primary:#a79bff;--primary-ink:#120d3b;--accent:#4ad6f0;--link:#b3a9ff;--link-h:#d6d0ff;--focus:#4ad6f0;
--cta:#a79bff;--cta-h:#c4bbff;--cta-ink:#120d3b;--code-bg:#221e57;--pre-bg:#070616;--pre-ink:#dcd8ff;--note-bg:#1a1747;--key-bg:#1d1a55;--thead-bg:#1d1a55;--chip-bg:#1a1747;--cross-bg:#0f2a3d;--step-bg:#a79bff;--step-ink:#120d3b;--rank-bg:#a79bff;--rank-ink:#120d3b;--ok:#3ee0b3;--ok-ink:#04241a}
body{line-height:1.85}
.hd{background:var(--surface);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.hd .wrap{display:flex;align-items:center;gap:18px;padding:12px 0}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink-strong);margin-right:auto;font-family:var(--font-head)}
.logo svg{width:38px;height:38px;flex:none}
.logo b{font-size:1.32rem;letter-spacing:.14em}
.logo small{display:block;font-size:.7rem;color:var(--muted);font-family:var(--font);letter-spacing:.04em;font-weight:400}
.site-nav{display:flex;gap:2px;flex-wrap:wrap}
.site-nav a{padding:.35em .85em;color:var(--ink);text-decoration:none;font-size:.92rem;border-bottom:2px solid transparent}
.site-nav a:hover,.site-nav a[aria-current]{color:var(--primary);border-bottom-color:var(--primary)}
.skip:focus{position:static;width:auto;height:auto;clip:auto;background:#fff;padding:6px}
.sky{position:relative;overflow:hidden;background:radial-gradient(ellipse at 78% 30%,#3a2a9a 0,transparent 55%),radial-gradient(ellipse at 10% 90%,#0d5d7a 0,transparent 50%),#0b0a26;color:#eae7ff;padding:64px 0 70px}
.sky::before{content:"";position:absolute;inset:0;background-image:radial-gradient(1.5px 1.5px at 20px 30px,#fff,transparent),radial-gradient(1px 1px at 90px 80px,#cfc8ff,transparent),radial-gradient(1.5px 1.5px at 160px 20px,#fff,transparent),radial-gradient(1px 1px at 230px 120px,#9be8f6,transparent),radial-gradient(1px 1px at 60px 150px,#fff,transparent);background-size:260px 180px;opacity:.7}
.sky .wrap{position:relative;display:grid;grid-template-columns:1.2fr .8fr;gap:30px;align-items:center}
.sky h1{font-size:clamp(2rem,5vw,3.2rem);color:#fff;letter-spacing:.06em;line-height:1.35}
.sky h1 span{color:#8fe6f7}
.sky p{max-width:34em;font-size:1.05rem;color:#d8d3ff}
.sky .btn{background:#8fe6f7;color:#06263a;border-color:#8fe6f7}
.sky .btn.ghost{background:transparent;color:#eae7ff;border-color:#8a80e0}
.planet{width:min(340px,100%);justify-self:center}
.atlas{padding:34px 0 8px}
.atlas h2{font-size:1.6rem;margin-bottom:6px}
.atlas>.wrap>p{color:var(--muted);margin-bottom:18px}
.orbits{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.orbit{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px}
.orbit h3{font-size:1.1rem;margin-bottom:8px;display:flex;align-items:center;gap:8px}
.orbit h3::before{content:"";width:10px;height:10px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 4px rgba(10,157,184,.18)}
.orbit ul{list-style:none;margin:0;padding:0}
.orbit li{margin:.35em 0}
.orbit a{text-decoration:none}
.orbit a:hover{text-decoration:underline}
.home-body{padding:22px 0 40px;max-width:820px}
.home-body h2{font-size:1.5rem;margin:1.6em 0 .5em}
.art{display:grid;grid-template-columns:230px minmax(0,1fr);gap:40px;padding:30px 0 56px;align-items:start}
.toc-col{position:sticky;top:76px;font-size:.9rem}
.toc-col h2{font-size:.78rem;letter-spacing:.14em;color:var(--muted);font-family:var(--font);margin-bottom:8px;font-weight:700}
.toc-meta{margin-top:14px;color:var(--muted);font-size:.8rem;line-height:1.6}
.toc-col .toc-box{margin-top:16px;padding:12px;border:1px solid var(--line);border-radius:var(--radius-s);background:var(--surface)}
.toc-col .toc-box p{font-size:.84rem;margin:0 0 8px;color:var(--muted)}
.content{max-width:760px}
.content h1{font-size:clamp(1.8rem,3.6vw,2.4rem);margin-bottom:8px;letter-spacing:.02em}
.content h2{font-size:1.5rem;margin:1.8em 0 .5em;padding-top:.4em;border-top:1px solid var(--line)}
.content h3{font-size:1.15rem;margin:1.3em 0 .3em}
.entry-meta{font-size:.82rem;color:var(--muted);margin:0 0 18px;display:flex;gap:14px;flex-wrap:wrap}
.entry-meta b{color:var(--accent);font-weight:700}
.lede{font-size:1.1rem;color:var(--ink);margin:0 0 1.3em}
.keybox{border-left:4px solid var(--accent);border-radius:0 var(--radius-s) var(--radius-s) 0;background:var(--key-bg)}
.keybox-label{color:var(--accent)}
.bc--plain{border-radius:var(--radius)}
.ft{background:var(--surface);border-top:1px solid var(--line);padding:30px 0 22px}
.ft-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:24px}
.ft h2{font-size:.9rem;letter-spacing:.1em;margin-bottom:8px}
.ft ul{list-style:none;margin:0;padding:0}.ft li{margin:4px 0;font-size:.9rem}
.ft p{font-size:.86rem;color:var(--muted)}
.ft-bot{margin-top:16px;padding-top:12px;border-top:1px solid var(--line)}
.notfound{text-align:center;padding:100px 0}
.notfound b{display:block;font-family:var(--font-head);font-size:5.5rem;color:var(--primary)}
@media(max-width:980px){.art{grid-template-columns:minmax(0,1fr)}.toc-col{position:static;display:none}.sky .wrap{grid-template-columns:1fr}.planet{display:none}.orbits{grid-template-columns:1fr 1fr}.ft-grid{grid-template-columns:1fr 1fr}}
@media(max-width:820px){.site-nav{display:none;width:100%;order:9}.site-nav.open{display:flex;flex-direction:column}.hd .wrap{flex-wrap:wrap}}
@media(max-width:560px){.orbits{grid-template-columns:1fr}.ft-grid{grid-template-columns:1fr}.sky{padding:44px 0 48px}}