@charset "UTF-8";
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.7;-webkit-font-smoothing:antialiased}body.dark{--ink:#f0f0e7;--muted:#bbc4c3;--line:#ffffff26;--soft:#ffffff08;--card:#ffffff07;--button-ink:#142023}body:not(.dark){--ink:#252c2b;--muted:#606967;--line:#18272524;--soft:#ffffff63;--card:#ffffff70;--button-ink:#fff}a{color:inherit;text-decoration:none;text-underline-offset:4px}a:hover{text-decoration:underline}button,input{font:inherit}button,a,input,summary{-webkit-tap-highlight-color:transparent}button{cursor:pointer}img,svg{max-width:100%;display:block}img{height:auto}h1,h2,h3,p,figure{margin:0}h1,h2,h3{line-height:1.32;letter-spacing:-.035em;font-weight:600}p{overflow-wrap:anywhere}::selection{background:var(--accent);color:var(--button-ink)}:focus-visible{outline:3px solid var(--accent);outline-offset:5px}.wrap{width:min(1240px,calc(100% - 112px));margin:auto}.skip{position:absolute;top:-100px;left:20px;z-index:99;padding:10px 20px;background:var(--accent);color:var(--button-ink)}.skip:focus{top:12px}.mast{border-bottom:1px solid var(--line)}.mast-inner{min-height:96px;display:flex;align-items:center;justify-content:space-between;gap:36px}.brand{display:flex;align-items:center;gap:14px;flex-shrink:0;text-decoration:none!important}.brand-mark{height:41px;width:41px;border:1px solid currentColor;display:grid;place-items:center;transform:rotate(-5deg);font-family:Georgia,"Songti SC",serif;font-size:25px;color:var(--accent)}.brand-name{font-size:23px;font-weight:650;line-height:1.2}.brand small{display:block;font-size:9px;letter-spacing:.17em;font-weight:500;margin-top:5px}.main-nav{display:flex;align-items:center;gap:29px;font-size:14px}.main-nav .nav-invite{border-bottom:1px solid var(--accent);padding:5px 0;color:var(--accent)}.label{font-size:11px;font-weight:600;letter-spacing:.16em;text-transform:uppercase;color:var(--accent);display:flex;align-items:center;gap:11px}.label:before{content:"";width:22px;height:1px;background:currentColor}.hero{display:grid;grid-template-columns:1.15fr 1fr;align-items:center;gap:40px;padding:80px 0 65px}.hero h1{font-family:"Songti SC","Noto Serif CJK SC",Georgia,serif;font-weight:500;font-size:clamp(40px,4.55vw,65px);letter-spacing:-.065em;line-height:1.2;margin:24px 0 27px}.hero h1 span{display:block}.hero h1 span:last-child{color:var(--accent)}.hero-copy>p{font-size:17px;max-width:33em;color:var(--muted);line-height:1.95}.hero-actions{display:flex;flex-wrap:wrap;align-items:center;gap:15px;margin:30px 0 15px}.button{display:inline-flex;align-items:center;justify-content:center;gap:30px;min-height:52px;padding:12px 24px;font-size:14px;font-weight:550;background:var(--accent);color:var(--button-ink);border:1px solid var(--accent);border-radius:2px;transition:transform .2s,box-shadow .2s;text-decoration:none!important}.button:hover{transform:translateY(-2px);box-shadow:0 5px 15px #0001}.button.outline{background:transparent;color:var(--ink);border-color:var(--line)}.hero .disclosure{font-size:11px;line-height:1.9;max-width:43em;color:var(--muted)}.disclosure a{text-decoration:underline}.folio{position:relative;min-height:465px;background:var(--soft);border:1px solid var(--line);padding:24px 27px;overflow:hidden}.folio-top{display:flex;justify-content:space-between;align-items:center;font-size:10px;letter-spacing:.13em;color:var(--muted);padding-bottom:16px;border-bottom:1px solid var(--line)}.folio svg{width:100%;height:320px;color:var(--accent);margin:10px 0}.folio-foot{display:flex;justify-content:space-between;gap:20px;align-items:end}.folio-foot strong{font-family:"Songti SC",serif;font-size:26px;line-height:1.2;font-weight:500}.folio-foot span{font-size:10px;color:var(--muted);letter-spacing:.08em}.orbit{transform-origin:230px 180px;animation:orbit 90s linear infinite}.orbit-dot{animation:pulse 5s ease-in-out infinite}@keyframes orbit{to{transform:rotate(360deg)}}@keyframes pulse{50%{opacity:.45}}.ribbon{display:grid;grid-template-columns:1.1fr 1fr 1fr;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.ribbon>div{padding:24px 32px;border-left:1px solid var(--line)}.ribbon>div:first-child{padding-left:0;border-left:0}.ribbon small{display:block;font-size:10px;letter-spacing:.1em;color:var(--muted);margin-bottom:4px}.ribbon strong{font-size:15px;font-weight:500}.section{padding:88px 0;border-bottom:1px solid var(--line)}.section-heading{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start;margin-bottom:36px}.section-heading h2{font-family:"Songti SC",serif;font-weight:500;font-size:39px;line-height:1.35;margin-top:14px}.section-heading>p{padding-top:27px;color:var(--muted);font-size:15px;line-height:1.95}.section-heading .compact{max-width:30em}.product-tabs{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}.product{background:var(--paper);padding:29px 27px;min-width:0}.product .no{font-size:11px;color:var(--accent);letter-spacing:.13em}.product h3{font-size:20px;margin:21px 0 13px}.product p{font-size:13px;line-height:1.85;color:var(--muted)}.product small{display:block;margin-top:19px;color:var(--accent);font-size:11px}.notice{margin-top:22px;font-size:12px;color:var(--muted);border-left:2px solid var(--accent);padding-left:17px;line-height:1.9}.focus-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 42px}.focus-note{padding:29px 0;border-top:1px solid var(--line)}.focus-note>span{color:var(--accent);font-family:Georgia,serif;font-style:italic;font-size:18px}.focus-note h3{font-size:20px;margin:11px 0 13px}.focus-note p{font-size:14px;color:var(--muted);line-height:1.9}.focus-note a{display:inline-block;margin-top:17px;font-size:12px;text-decoration:underline}.tool{display:grid;grid-template-columns:.88fr 1.12fr;gap:74px;padding:48px;background:var(--soft);border:1px solid var(--line)}.tool h2{font-family:"Songti SC",serif;font-size:33px;font-weight:500;margin:13px 0 18px}.tool p{font-size:14px;color:var(--muted)}.tool .progress{font:italic 48px Georgia,serif;color:var(--accent);margin:27px 0 3px;line-height:1}.tool .progress small{font-size:23px}.checklist{display:grid;align-content:center}.checklist label{display:flex;align-items:flex-start;gap:15px;cursor:pointer;padding:19px 0;border-bottom:1px solid var(--line);font-size:15px}.checklist input{width:19px;height:19px;accent-color:var(--accent);margin:5px 0 0;flex:none}.checklist button{border:0;border-bottom:1px solid var(--muted);background:transparent;color:var(--muted);justify-self:end;font-size:12px;padding:7px 0;margin-top:15px}.tool-status{font-size:12px!important;line-height:1.85;margin-top:15px}.guides-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:23px}.guide-card{border:1px solid var(--line);padding:31px;display:flex;flex-direction:column;min-height:320px;transition:transform .25s,background .25s;text-decoration:none!important}.guide-card:hover{transform:translateY(-4px);background:var(--soft)}.guide-card.featured{background:var(--accent);color:var(--button-ink);border-color:var(--accent)}.guide-card .small{font-size:10px;letter-spacing:.13em;opacity:.78}.guide-card h3{font-size:23px;line-height:1.5;margin:30px 0 16px}.guide-card p{font-size:13px;line-height:1.85;opacity:.8;margin-bottom:25px}.guide-card .card-link{font-size:12px;margin-top:auto;display:flex;justify-content:space-between}.faq-section{display:grid;grid-template-columns:.7fr 1.3fr;gap:80px}.faq-section h2{font-family:"Songti SC",serif;font-size:37px;font-weight:500;margin-top:16px}.faq details{border-bottom:1px solid var(--line);padding:19px 0}.faq details:first-child{border-top:1px solid var(--line)}summary{cursor:pointer;list-style:none;font-size:15px;font-weight:550;display:flex;justify-content:space-between;gap:15px}summary::-webkit-details-marker{display:none}summary:after{content:"+";font-weight:400;color:var(--accent)}details[open]>summary:after{content:"−"}.faq p{color:var(--muted);font-size:14px;margin-top:15px;line-height:1.95}.source-row{display:flex;gap:18px;flex-wrap:wrap;align-items:center;margin-top:27px;font-size:12px;color:var(--muted)}.source-row a{text-decoration:underline}.last-note{display:grid;grid-template-columns:1.2fr .8fr;gap:50px;align-items:center}.last-note h2{font:500 35px/1.4 "Songti SC",serif;margin-bottom:18px}.last-note p{font-size:14px;color:var(--muted)}.last-note .right{text-align:right}.last-note .right p{font-size:11px;margin-top:12px}.footer{padding:45px 0 30px}.footer-top{display:flex;justify-content:space-between;align-items:start;gap:45px}.footer p{font-size:12px;color:var(--muted);max-width:46em;line-height:1.95;margin-top:16px}.footer-links{display:flex;gap:22px;flex-wrap:wrap;font-size:12px;padding-top:6px}.footer-bottom{display:flex;justify-content:space-between;gap:20px;font-size:10px;color:var(--muted);letter-spacing:.1em;padding-top:32px;margin-top:27px;border-top:1px solid var(--line)}.breadcrumb{font-size:12px;color:var(--muted);display:flex;gap:12px;flex-wrap:wrap;margin-bottom:29px}.article-head{padding:52px 0 45px;border-bottom:1px solid var(--line);max-width:1000px}.article-head h1{font:500 clamp(32px,3.8vw,51px)/1.4 "Songti SC",serif;letter-spacing:-.025em;max-width:19em;margin:20px 0 24px}.article-head .lead{font-size:17px;color:var(--muted);max-width:44em;line-height:1.9}.byline{display:flex;flex-wrap:wrap;gap:9px 21px;margin-top:23px;font-size:11px;color:var(--muted)}.article-layout{display:grid;grid-template-columns:240px minmax(0,760px);gap:66px;padding:47px 0 70px;align-items:start}.toc{position:sticky;top:30px;padding:23px 0;border-top:2px solid var(--accent);border-bottom:1px solid var(--line);font-size:12px}.toc summary{font-size:12px;letter-spacing:.05em}.toc ol{list-style:none;padding:0;margin:16px 0 0;display:grid;gap:11px}.toc a{color:var(--muted);line-height:1.6;display:block}.toc a:hover{color:var(--accent)}.toc .toc-invite{color:var(--accent);border-top:1px solid var(--line);padding-top:15px;margin-top:20px}.article-body{min-width:0}.article-body .intro-note{font-size:14px;line-height:1.95;color:var(--muted);padding:22px 26px;background:var(--soft);border-left:2px solid var(--accent);margin-bottom:34px}.article-body section{scroll-margin-top:35px;margin-bottom:38px}.article-body h2{font-size:27px;font-family:"Songti SC",serif;font-weight:500;margin:0 0 20px;line-height:1.5}.article-body h3{font-size:19px;margin:24px 0 12px}.article-body .copy p{font-size:16px;line-height:2.1;margin:17px 0;color:var(--ink)}.article-body .copy p:first-child{margin-top:0}.article-body figure{margin:31px 0 39px;border:1px solid var(--line);padding:10px;background:var(--soft)}.article-body figure img{width:100%;max-height:520px;object-fit:contain;background:#fff}.article-body figcaption{font-size:11px;color:var(--muted);line-height:1.9;padding:15px 12px 8px}.article-body figcaption a{text-decoration:underline}.article-body .sources{margin-top:46px;padding-top:28px;border-top:1px solid var(--line)}.sources ul{padding-left:20px;line-height:2;font-size:13px;color:var(--muted)}.sources a{text-decoration:underline}.article-body .callout{border:1px solid var(--line);padding:29px;margin:35px 0;background:var(--soft)}.callout h2{font-size:24px}.callout p{font-size:13px!important;color:var(--muted);line-height:1.9!important;margin:16px 0}.article-body .related{margin-top:35px;display:grid;gap:14px}.related>a{border-top:1px solid var(--line);padding-top:15px;display:flex;justify-content:space-between;gap:25px;font-size:15px}.legal{max-width:830px;padding:60px 0 80px}.legal h1{font:500 45px/1.4 "Songti SC",serif;margin:25px 0}.legal h2{font-size:25px;margin:35px 0 15px}.legal p{font-size:16px;line-height:2;color:var(--muted);margin:17px 0}.legal a{text-decoration:underline}.reading-progress{position:fixed;top:0;left:0;height:3px;background:var(--accent);width:0;z-index:100}.back-top{display:inline-block;margin-top:30px;font-size:12px;color:var(--accent)}
.article-head h1{text-wrap:balance}
@media(min-width:1500px){.hero{padding-top:100px;padding-bottom:85px}.hero h1{font-size:69px}.folio{min-height:480px}}
@media(max-width:1100px){.wrap{width:calc(100% - 64px)}.hero{gap:28px}.hero h1{font-size:49px}.folio{padding:19px;min-height:410px}.folio svg{height:270px}.folio-foot strong{font-size:23px}.hero-copy>p{font-size:15px}.product{padding:24px 18px}.guides-grid{gap:15px}.guide-card{padding:24px}.guide-card h3{font-size:21px}.article-layout{grid-template-columns:210px minmax(0,1fr);gap:38px}.main-nav{gap:21px}.tool{gap:42px;padding:35px}}
@media(max-width:800px){.wrap{width:calc(100% - 42px)}.mast-inner{min-height:84px;gap:20px}.brand-name{font-size:20px}.brand-mark{height:36px;width:36px;font-size:22px}.main-nav{font-size:12px;gap:17px}.main-nav .nav-about{display:none}.hero{grid-template-columns:1fr;padding:49px 0 40px;gap:38px}.hero h1{font-size:clamp(35px,7vw,54px);margin:21px 0}.hero-copy>p{max-width:35em;font-size:16px}.folio{min-height:380px;max-width:580px;width:100%;margin:auto}.folio svg{height:250px}.section{padding:58px 0}.section-heading{gap:30px;margin-bottom:30px}.section-heading h2{font-size:32px}.section-heading>p{font-size:14px;padding-top:20px}.product-tabs{grid-template-columns:1fr 1fr}.product{padding:25px}.product h3{margin-top:17px}.ribbon>div{padding:19px 20px}.ribbon strong{font-size:13px}.ribbon small{font-size:9px}.focus-grid{gap:0 25px}.focus-note h3{font-size:18px}.tool{grid-template-columns:1fr;gap:24px;padding:29px}.tool .progress{font-size:38px;margin-top:22px}.guides-grid{grid-template-columns:1fr 1fr}.guide-card.featured{grid-column:1/-1;min-height:240px}.guide-card{min-height:270px}.guide-card h3{margin-top:22px}.faq-section{grid-template-columns:1fr;gap:30px}.faq-section h2{font-size:32px}.last-note{gap:27px}.last-note h2{font-size:29px}.footer-top{display:block}.footer-links{margin-top:24px}.article-layout{grid-template-columns:1fr;gap:31px;padding-top:27px}.toc{position:static;padding:17px 0}.toc ol{grid-template-columns:1fr 1fr;gap:12px 23px}.article-head{padding-top:35px}.article-head h1{font-size:37px}.article-body .copy p{font-size:16px}.article-body h2{font-size:25px}.article-body figure img{max-height:450px}.legal h1{font-size:36px}}
@media(max-width:480px){.wrap{width:calc(100% - 36px)}.mast-inner{min-height:79px;gap:13px}.brand{gap:9px}.brand small{font-size:7px;letter-spacing:.1em}.brand-name{font-size:19px}.brand-mark{width:33px;height:33px;font-size:20px}.main-nav{gap:14px}.main-nav .nav-guide{display:none}.nav-invite{font-size:11px}.hero{padding-top:38px;gap:29px}.hero h1{font-size:clamp(31px,9.2vw,43px);letter-spacing:-.06em;line-height:1.3}.hero-copy>p{font-size:14px}.label{font-size:9px;letter-spacing:.1em}.hero-actions{gap:10px;margin-top:25px}.button{min-height:48px;padding:11px 16px;gap:18px;font-size:12px}.hero .disclosure{font-size:10px;line-height:1.9}.folio{padding:16px;min-height:320px}.folio-top{font-size:8px}.folio svg{height:210px;margin:1px 0}.folio-foot strong{font-size:22px}.folio-foot span{font-size:8px}.ribbon{grid-template-columns:1fr 1fr}.ribbon>div{padding:17px 15px}.ribbon>div:first-child{padding-left:0}.ribbon>div:last-child{grid-column:1/-1;border-left:0;border-top:1px solid var(--line);padding-left:0}.section{padding:47px 0}.section-heading{grid-template-columns:1fr;gap:16px;margin-bottom:27px}.section-heading h2{font-size:30px;margin-top:13px}.section-heading>p{padding-top:0;font-size:14px}.product{padding:24px 17px}.product h3{font-size:18px}.product p{font-size:12px}.product small{font-size:10px}.notice{font-size:11px}.focus-grid{grid-template-columns:1fr}.focus-note{padding:23px 0}.focus-note h3{font-size:20px}.focus-note p{font-size:14px}.tool{padding:25px 20px;gap:14px}.tool h2{font-size:29px}.tool p{font-size:13px}.checklist label{font-size:14px;gap:12px;padding:16px 0}.guides-grid{grid-template-columns:1fr}.guide-card,.guide-card.featured{min-height:235px;padding:27px}.guide-card h3{font-size:23px;margin:23px 0 15px}.faq-section h2{font-size:30px}summary{font-size:14px}.faq p{font-size:13px}.last-note{grid-template-columns:1fr;gap:23px}.last-note h2{font-size:29px}.last-note .right{text-align:left}.footer{padding-top:35px}.footer-bottom{display:block;font-size:9px}.footer-bottom span{display:block;margin:7px 0}.footer-links{gap:21px}.article-head{padding:29px 0 32px}.article-head h1{font-size:31px;line-height:1.45;margin-top:18px}.article-head .lead{font-size:15px}.breadcrumb{font-size:10px;gap:9px}.byline{font-size:10px;gap:8px 16px}.article-body .intro-note{font-size:13px;padding:19px}.article-body .copy p{font-size:15px;line-height:2.05}.article-body h2{font-size:24px;line-height:1.5}.toc ol{grid-template-columns:1fr}.article-body figcaption{font-size:10px;padding:12px 7px 6px}.article-body figure{padding:6px;margin:27px 0}.article-body .callout{padding:24px 20px}.legal{padding:38px 0 60px}.legal h1{font-size:32px}.legal p{font-size:15px}.legal h2{font-size:23px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation:none!important;transition:none!important}.reading-progress{display:none}}
@media print{.mast,.footer,.toc,.hero-actions,.callout,.reading-progress{display:none}.wrap{width:100%}.article-layout{display:block}.article-head{padding-top:0}body{background:#fff!important;color:#111!important}.article-body .copy p{color:#111}.article-body figure{break-inside:avoid}}
