*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--fg);font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,sans-serif;line-height:1.72;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
p{margin:0}
ul{margin:0;padding:0;list-style:none}
h1,h2,h3,h4{margin:0;font-weight:700;line-height:1.25;letter-spacing:-.01em}
.wrap{width:min(1160px,calc(100% - 40px));margin:0 auto}
.bm{width:1.5em;height:1.5em;flex:0 0 auto}
.brand{display:inline-flex;align-items:center;gap:.55em;font-weight:700;letter-spacing:.01em}
.brand-name{display:inline-flex;align-items:baseline;gap:.4em;font-size:19px}
.brand-name em{font-style:normal;font-size:12px;letter-spacing:.16em;opacity:.62;text-transform:uppercase}
.btn{padding:13px 24px;border-radius:10px;font-size:15px;font-weight:600;border:1px solid transparent;transition:transform .18s,background .18s,border-color .18s;background:var(--accent);color:var(--on-accent)}
.btn:not([hidden]){display:inline-flex;align-items:center;justify-content:center;gap:.5em}
.btn:hover{transform:translateY(-2px)}
.btn-line{background:transparent;border-color:var(--line);color:var(--fg)}
.btn-line:hover{border-color:var(--accent);color:var(--accent)}
.btn-ghost{background:transparent;border-color:currentColor;color:inherit;opacity:.85}
.eyebrow{margin:0 0 10px;font-size:12px;letter-spacing:.22em;text-transform:uppercase;color:var(--accent);font-weight:700}
.sec-head{max-width:720px;margin:0 0 34px}
.sec-head h2{font-size:clamp(26px,3.4vw,38px)}
.sec-sub{margin-top:12px;color:var(--mut);font-size:16px;max-width:62ch}
.dl-band{padding:clamp(56px,7vw,92px) 0}
.dl-grid{display:flex;flex-wrap:wrap;justify-content:center;gap:16px;max-width:1020px;margin:0 auto}
.dl-band:not(:has(.dl-card:not([hidden]))){display:none}
.dl-card{flex:1 1 250px;max-width:320px;padding:26px 24px;border:1px solid var(--line);border-radius:14px;background:var(--card);color:var(--fg);transition:transform .2s,border-color .2s,box-shadow .2s}
.dl-card:not([hidden]){display:flex;flex-direction:column;gap:8px}
.dl-card:hover{transform:translateY(-4px);border-color:var(--accent);box-shadow:0 14px 36px rgba(0,0,0,.12)}
.dl-ch{font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--accent);font-weight:700}
.dl-name{font-size:21px}
.dl-desc{font-size:14px;color:var(--mut);flex:1}
.dl-go{margin-top:10px;font-size:14px;font-weight:700;color:var(--accent)}
.dl-note{margin-top:20px;font-size:13px;color:var(--mut)}
.faq{padding:clamp(56px,7vw,96px) 0}
.qa-list{max-width:860px;border-top:1px solid var(--line)}
.qa{border-bottom:1px solid var(--line);padding:18px 0}
.qa summary{display:flex;justify-content:space-between;gap:18px;cursor:pointer;font-weight:600;font-size:16px;list-style:none}
.qa summary::-webkit-details-marker{display:none}
.qa summary::after{content:"+";color:var(--accent);font-weight:700}
.qa[open] summary::after{content:"–"}
.qa p{margin-top:12px;color:var(--mut);font-size:15px;max-width:70ch}
.foot{border-top:1px solid var(--line);padding:56px 0 26px;background:var(--bg2)}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:36px}
.foot-brand p{margin-top:16px;font-size:14px;color:var(--mut);max-width:44ch}
.foot-col h3{font-size:13px;letter-spacing:.12em;text-transform:uppercase;color:var(--mut);margin-bottom:14px}
.foot-col li{margin-bottom:10px}
.foot-col a{font-size:14px;color:var(--fg);opacity:.78}
.foot-col a:hover{opacity:1;color:var(--accent)}
.foot-base{margin-top:44px;padding-top:20px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}
.foot-base p{font-size:12px;color:var(--mut)}
@media (max-width:900px){
 .foot-grid{grid-template-columns:1fr 1fr}
 .sec-head{margin-bottom:26px}
}
@media (max-width:620px){
 .wrap{width:calc(100% - 32px)}
 .foot-grid{grid-template-columns:1fr;gap:26px}
 .nav-links{display:none}
 .btn{padding:11px 18px;font-size:14px}
}

:root{--bg:#f8f5ef;--bg2:#f8f5ef2;--card:#fffdf9;--fg:#181613;--mut:#6b6357;--line:#dcd4c6;--accent:#a33a2b;--accent2:#35513f;--on-accent:#fffaf3;--serif:"Songti SC","Noto Serif SC",Georgia,"Times New Roman",serif}
body{font-family:"Songti SC","Noto Serif SC",Georgia,serif;line-height:1.85}
.masthead{border-bottom:3px double var(--fg);background:var(--bg)}
.mast-top{display:flex;justify-content:space-between;align-items:center;padding:12px 0;border-bottom:1px solid var(--line);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--mut)}
.mast-in{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:20px 0}
.mast-in .brand-name{font-size:26px;font-family:var(--serif)}
.mast-nav{display:flex;gap:26px;font-size:13px;letter-spacing:.08em}
.mast-nav a:hover{color:var(--accent);border-bottom:1px solid var(--accent)}
.mast-cta{padding:9px 16px;font-size:12px;border-radius:2px}
.hero{padding:clamp(40px,6vw,72px) 0 0}
.kicker{display:flex;gap:16px;align-items:center;font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--accent);font-weight:700}
.kicker::after{content:"";flex:1;height:1px;background:var(--line)}
.hero-grid{display:grid;grid-template-columns:8fr 4fr;gap:40px;margin-top:24px;align-items:end}
.hero h1{font-family:var(--serif);font-size:clamp(38px,5.4vw,68px);line-height:1.12;letter-spacing:-.01em;font-weight:700;text-wrap:balance}
.hero .lead{margin-top:22px;font-size:18px;color:var(--mut);max-width:46ch}
.hero-side{border-left:1px solid var(--line);padding-left:24px;font-size:13px;color:var(--mut)}
.hero-side dt{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);margin-top:14px}
.hero-side dt:first-child{margin-top:0}
.hero-side dd{margin:4px 0 0;color:var(--fg);font-size:14px}
.hero-figure{max-width:720px;margin:36px auto 0;border-top:1px solid var(--fg);border-bottom:1px solid var(--fg);padding:14px 0}
.hero-figure .media{aspect-ratio:4/3;display:flex;align-items:center;justify-content:center;padding:18px;background:#12120f}
.hero-figure img{max-width:100%;max-height:100%;width:auto;height:auto;object-fit:contain}
.hero-figure figcaption{display:flex;justify-content:space-between;gap:16px;margin-top:10px;font-size:12px;color:var(--mut);font-style:italic}
.inline-fig{width:min(320px,100%);margin:28px 0 0 auto;border:1px solid var(--line);padding:12px;background:var(--card)}
.inline-fig .media{height:420px;display:flex;align-items:center;justify-content:center;background:var(--bg2)}
.inline-fig img{max-width:100%;max-height:100%;width:auto;height:auto;object-fit:contain}
.inline-fig figcaption{margin-top:10px;font-size:12px;color:var(--mut);font-style:italic}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}
.toc{border-top:1px solid var(--fg);border-bottom:1px solid var(--fg);margin-top:42px;padding:24px 0}
.toc h2{font-size:11px;letter-spacing:.24em;text-transform:uppercase;color:var(--mut);margin-bottom:16px}
.toc ol{display:grid;grid-template-columns:repeat(3,1fr);gap:10px 28px;margin:0;padding:0;list-style:none}
.toc li{display:flex;gap:12px;font-size:14px;padding:7px 0;border-bottom:1px dotted var(--line)}
.toc b{color:var(--accent);font-size:12px;letter-spacing:.1em}
.toc a:hover{color:var(--accent)}
.chapter{padding:clamp(46px,6vw,76px) 0;border-bottom:1px solid var(--line)}
.chapter-head{display:grid;grid-template-columns:110px 1fr;gap:24px;align-items:baseline;margin-bottom:28px}
.chapter-no{font-size:12px;letter-spacing:.2em;color:var(--accent)}
.chapter h2{font-family:var(--serif);font-size:clamp(26px,3.4vw,40px)}
.chapter-sub{margin-top:10px;color:var(--mut);font-size:15px}
.two{display:grid;grid-template-columns:1fr 1fr;gap:0 56px}
.two .item{padding:18px 0;border-top:1px solid var(--line)}
.two .item h3{font-size:17px;margin-bottom:6px}
.two .item p{font-size:14.5px;color:var(--mut)}
.deflist{border-top:1px solid var(--fg)}
.deflist .row{display:grid;grid-template-columns:180px 1fr;gap:24px;padding:18px 0;border-bottom:1px solid var(--line)}
.deflist h3{font-size:16px;font-family:var(--serif)}
.deflist p{font-size:14.5px;color:var(--mut)}
.prose{max-width:760px}
.prose h3{font-family:var(--serif);font-size:22px;margin-bottom:10px}
.prose p{font-size:16px;margin-bottom:16px;color:var(--fg)}
.two.mt{margin-top:32px}
.prose p+p{color:var(--mut);font-size:15px}
.prose .drop::first-letter{float:left;font-size:56px;line-height:.9;padding:6px 10px 0 0;color:var(--accent);font-family:var(--serif)}
.pull{margin:34px 0;padding:22px 0 22px 24px;border-left:3px solid var(--accent);font-size:20px;line-height:1.6;font-family:var(--serif);color:var(--fg)}
.pull cite{display:block;margin-top:10px;font-size:12px;font-style:normal;letter-spacing:.12em;color:var(--mut)}
.table-wrap{margin-top:32px;overflow-x:auto}
table{width:100%;border-collapse:collapse;font-size:13.5px}
caption{text-align:left;font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--mut);padding-bottom:10px}
th,td{text-align:left;padding:12px 14px 12px 0;border-bottom:1px solid var(--line);vertical-align:top}
thead th{font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);border-bottom:1px solid var(--fg)}
tbody th{font-weight:600;width:128px}
td{color:var(--mut)}
.steps{counter-reset:s;max-width:820px}
.step{position:relative;padding:20px 0 20px 64px;border-top:1px solid var(--line);counter-increment:s}
.step::before{content:counter(s,decimal-leading-zero);position:absolute;left:0;top:20px;font-size:12px;letter-spacing:.14em;color:var(--accent)}
.step h3{font-size:18px;margin-bottom:5px}
.step p{font-size:14.5px;color:var(--mut)}
.footnotes{display:grid;grid-template-columns:repeat(2,1fr);gap:0 48px;max-width:900px}
.footnote{padding:16px 0;border-top:1px solid var(--line);font-size:13.5px;color:var(--mut)}
.footnote sup{color:var(--accent);font-weight:700;margin-right:6px}
.footnote b{display:block;color:var(--fg);font-size:14.5px;margin-bottom:3px}
.qa-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 48px;border-top:1px solid var(--fg);padding-top:6px}
.qa-grid .qa{border-bottom:1px solid var(--line)}
.qa p{font-family:"PingFang SC","Microsoft YaHei",sans-serif;font-size:13.5px;line-height:1.8}
.endcta{margin:clamp(48px,6vw,80px) 0;padding:40px;border:1px solid var(--fg);display:flex;justify-content:space-between;align-items:center;gap:30px;flex-wrap:wrap;background:var(--card)}
.endcta h2{font-family:var(--serif);font-size:clamp(24px,3vw,34px);max-width:24ch}
.endcta p{margin-top:8px;color:var(--mut);font-size:14px;max-width:44ch}
.foot{font-family:"PingFang SC","Microsoft YaHei",sans-serif}
.foot .brand-name{font-family:var(--serif)}
@media (max-width:980px){
 .hero-grid{grid-template-columns:1fr}
 .hero-side{border-left:0;padding-left:0;border-top:1px solid var(--line);padding-top:16px;display:grid;grid-template-columns:1fr 1fr;gap:0 20px}
 .toc ol{grid-template-columns:1fr 1fr}
 .two,.footnotes,.qa-grid{grid-template-columns:1fr}
 .chapter-head{grid-template-columns:1fr;gap:6px}
 .deflist .row{grid-template-columns:1fr;gap:4px}
}
@media (max-width:620px){
 .mast-nav{display:none}
 .mast-in{padding:14px 0}
 .hero h1{font-size:34px}
 .hero .lead{font-size:16px}
 .toc ol{grid-template-columns:1fr}
 .endcta{padding:26px}
 .hero-figure img{max-height:260px}
}