*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;overflow-wrap:anywhere}
img{max-width:100%;height:auto}
a{color:inherit}
.nt{position:absolute;opacity:0;pointer-events:none}
.burger{display:none;cursor:pointer;width:44px;height:44px;align-items:center;justify-content:center}
.burger span,.burger span::before,.burger span::after{display:block;width:22px;height:2px;background:currentColor;content:"";position:relative}
.burger span::before{position:absolute;top:-7px}.burger span::after{position:absolute;top:7px}
.tbl{overflow-x:auto}table{border-collapse:collapse;width:100%}
details>summary{cursor:pointer;list-style:none}details>summary::-webkit-details-marker{display:none}
@media (max-width:820px){.burger{display:flex}.nav{display:none}.nt:checked~.nav{display:flex}}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
body{background:var(--bg);color:var(--ink);font:16px/1.85 var(--ft)}
.wrap{max-width:var(--ww,1080px);margin:0 auto;padding:0 20px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none}
.brand img{width:38px;height:38px;flex:none}
.brand b{display:block;font-size:18px;letter-spacing:2px;line-height:1.2}
.brand i{display:block;font-style:normal;font-size:11px;color:var(--mut);line-height:1.2}
.nav a{text-decoration:none;color:var(--mut)}
.nav a:hover,.nav a[aria-current]{color:var(--ink)}
.btn{display:inline-block;padding:12px 26px;border-radius:999px;background:var(--acc);color:var(--onacc,#fff);font-weight:700;text-decoration:none;transition:transform .2s,box-shadow .2s}
.btn:hover{transform:translateY(-2px)}
.article{max-width:var(--aw,780px);margin:0 auto;padding:36px 20px 72px}
.crumbs{font-size:13px;color:var(--mut);display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}.crumbs a{text-decoration:none}
.article h1{font-size:clamp(26px,4vw,36px);line-height:1.35;margin:0 0 10px}
.meta{color:var(--mut);font-size:13px;margin:0 0 24px}
.prose h2{font-size:23px;line-height:1.4;margin:2em 0 .6em}
.prose h3{font-size:18px;margin:1.6em 0 .4em}
.prose p{margin:.9em 0}
.prose ul,.prose ol{padding-left:1.3em}.prose li{margin:.35em 0}
.prose a{color:var(--acc2);text-underline-offset:3px}
.lede{font-size:18px}
.steps{counter-reset:s;list-style:none;padding:0!important}
.steps li{counter-increment:s;position:relative;padding:16px 16px 16px 66px;margin:12px 0;background:var(--card);border:1px solid var(--line);border-radius:var(--r)}
.steps li::before{content:counter(s);position:absolute;left:16px;top:16px;width:34px;height:34px;border-radius:50%;background:var(--acc);color:var(--onacc,#fff);display:grid;place-items:center;font-weight:700}
.steps b{display:block}.steps span{color:var(--mut)}
.tbl{border:1px solid var(--line);border-radius:var(--r);margin:1.2em 0}
th,td{padding:10px 14px;text-align:left;border-bottom:1px solid var(--line);font-size:15px;vertical-align:top}
tbody tr:last-child>*{border-bottom:0}
thead th{background:var(--card);white-space:nowrap}
.callout{background:var(--card);border:1px solid var(--line);border-left:4px solid var(--acc);border-radius:var(--r);padding:14px 18px;margin:1.4em 0}
.cta-row{margin:24px 0}.cta-row small{display:block;margin-top:8px;color:var(--mut)}
.faq details{border:1px solid var(--line);border-radius:var(--r);margin:10px 0;background:var(--card)}
.faq summary{padding:14px 18px;font-weight:600}
.faq summary::after{content:"+";float:right;color:var(--acc2)}
.faq details[open] summary::after{content:"−"}
.faq details p{margin:0;padding:0 18px 16px;color:var(--mut)}
.kv div{display:grid;grid-template-columns:150px 1fr;gap:12px;padding:12px 0;border-bottom:1px solid var(--line)}
.kv dt{font-weight:700;color:var(--acc2)}.kv dd{margin:0}
.endcta{margin-top:44px;padding:24px;border-radius:var(--r);background:var(--card);border:1px solid var(--line);text-align:center}
.endcta p{margin:.3em 0}
.related{margin-top:40px}.related h2{font-size:20px}
.related ul{list-style:none;padding:0}.related li{padding:12px 0;border-bottom:1px solid var(--line)}
.related a{font-weight:700;display:block;text-decoration:none}.related a:hover{color:var(--acc2)}
.related span{color:var(--mut);font-size:14px}
.site-footer{border-top:1px solid var(--line);padding:34px 0;color:var(--mut);font-size:14px}
.site-footer p{margin:.5em 0}.site-footer a{color:var(--ink)}
.fnav{display:flex;gap:18px;flex-wrap:wrap;margin:10px 0}
.toc{display:none}
@media (max-width:820px){.kv div{grid-template-columns:1fr;gap:2px}.steps li{padding-left:58px}}
:root{--bg:#f6efe3;--card:#fffaf0;--ink:#2a2118;--mut:#6f6455;--line:#e0d3bd;--acc:#c4552b;--acc2:#a1431f;--onacc:#fff;--r:4px;--aw:720px;--ft:"Noto Serif SC","Songti SC","STSong",SimSun,serif}
.site-header{background:var(--bg);border-bottom:3px double var(--ink)}
.mast-top{display:flex;align-items:center;justify-content:space-between;padding:22px 0 8px}
.brand{flex-direction:column;align-items:flex-start;gap:6px}
.brand img{width:44px;height:44px}
.brand b{font-size:34px;letter-spacing:6px}
.brand i{font-size:12px;letter-spacing:4px}
.shell-mast .mast-top{justify-content:center;position:relative}
.shell-mast .brand{flex-direction:row;align-items:center;gap:14px}
.shell-mast .brand span{text-align:left}
.shell-mast .nav{display:flex;justify-content:center;gap:6px 22px;flex-wrap:wrap;border-top:1px solid var(--ink);padding:10px 0;font-size:14px;font-family:system-ui,"Microsoft YaHei",sans-serif}
.nav a[aria-current]{color:var(--acc2);border-bottom:2px solid var(--acc2)}
.btn{border-radius:2px;font-family:system-ui,"Microsoft YaHei",sans-serif}
.cover{display:grid;grid-template-columns:1.1fr .9fr;gap:34px;padding:44px 0 30px;border-bottom:1px solid var(--line);align-items:center}
.issue{font:12px/1 system-ui,sans-serif;letter-spacing:3px;color:var(--acc2);text-transform:uppercase;margin:0 0 14px}
.cover h1{font-size:clamp(32px,5vw,52px);line-height:1.2;margin:0 0 16px}
.cover h1 em{font-style:normal;color:var(--acc)}
.cover p.dek{font-size:18px;color:var(--mut);margin:0 0 22px}
.cover figure{margin:0;background:#17204a;padding:34px;display:grid;place-items:center;position:relative}
.cover figure::before{content:"";position:absolute;inset:10px;border:1px solid rgba(255,192,122,.5)}
.cover figure img{width:70%;animation:drift 7s ease-in-out infinite}
.cover figcaption{position:absolute;bottom:14px;left:0;right:0;text-align:center;color:#ffc07a;font:11px system-ui,sans-serif;letter-spacing:3px}
@keyframes drift{50%{transform:translateY(-8px) rotate(-2deg)}}
.toc-list{counter-reset:t;list-style:none;padding:0;margin:0}
.toc-list li{counter-increment:t;border-bottom:1px dotted var(--mut)}
.toc-list a{display:grid;grid-template-columns:48px 1fr;gap:6px;padding:18px 0;text-decoration:none}
.toc-list a::before{content:counter(t,decimal-leading-zero);font:700 26px/1 Georgia,serif;color:var(--acc)}
.toc-list b{display:block;font-size:19px}.toc-list span{color:var(--mut);font-size:14px;grid-column:2}
.toc-list a:hover b{color:var(--acc2);text-decoration:underline}
.deck{padding:36px 0}.deck h2{font-size:26px;border-left:6px solid var(--acc);padding-left:12px;margin:0 0 18px}
.pull{font-size:22px;line-height:1.7;border-top:3px solid var(--ink);border-bottom:1px solid var(--ink);padding:18px 0;margin:30px 0;text-align:center}
.three{display:grid;grid-template-columns:repeat(3,1fr);gap:0;list-style:none;padding:0;margin:0;border-top:1px solid var(--ink)}
.three li{padding:18px 20px 18px 0;margin-right:20px;border-right:1px solid var(--line)}
.three li:last-child{border:0;margin:0}.three b{display:block;color:var(--acc2)}.three span{font-size:15px;color:var(--mut)}
.faq details{border-radius:0;background:transparent;border-width:0 0 1px}
.article h1{font-size:clamp(28px,4.4vw,40px)}
.prose p:first-of-type::first-letter{}
.prose .lede{font-size:19px;border-left:3px solid var(--acc);padding-left:14px;color:var(--mut)}
.callout{border-radius:0;border-width:1px;border-left-width:6px;background:transparent}
.endcta{border-radius:0;background:#17204a;color:#eef0ff;border:0}
.endcta p{color:#eef0ff}
@media (max-width:820px){.cover{grid-template-columns:1fr}.three{grid-template-columns:1fr}.three li{border:0;border-bottom:1px solid var(--line);margin:0;padding:14px 0}.shell-mast .mast-top{justify-content:space-between}.brand b{font-size:24px}.shell-mast .nav{display:none;flex-direction:column;text-align:center}.nt:checked~.nav{display:flex}}