:root{--bg:#F6FAFC;--white:#fff;--surface:#EAF6FA;--soft:#EDF4F8;--cyan:#25C8D1;--sky:#25B6E8;--blue:#1787DB;--navy:#174B78;--heading:#183A56;--body:#31485D;--muted:#687D8E;--line:#DCE9F0;--footer:#123653}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:var(--bg);color:var(--body);font:16px/1.8 Arial,'PingFang SC','Microsoft YaHei',sans-serif;overflow-x:hidden}body.drawer-open{overflow:hidden}a{color:var(--navy);text-decoration-thickness:1px;text-underline-offset:4px}a:hover{color:var(--blue)}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--cyan);outline-offset:3px}button{font:inherit;cursor:pointer}h1,h2,h3,p{margin-top:0}h1,h2,h3{color:var(--heading);line-height:1.38}h1{font-size:clamp(32px,3.3vw,40px);letter-spacing:-.035em;margin-bottom:22px}h2{font-size:26px;letter-spacing:-.02em}h3{font-size:20px}p{margin-bottom:17px}img{max-width:100%;height:auto}.container{width:min(100% - 56px,1180px);margin-inline:auto}.section{padding:54px 0}.section--tint{background:var(--surface)}.section--white{background:white}.section-head{max-width:790px;margin-bottom:28px}.section-head p,.section-intro{color:var(--muted)}.eyebrow{font-size:13px;font-weight:700;letter-spacing:.13em;color:#087A99;margin-bottom:12px}.lead{font-size:18px;line-height:1.8}.skip-link{position:absolute;left:12px;top:-80px;z-index:120;background:white;padding:8px 14px}.skip-link:focus{top:8px}.site-header{background:#fff;border-bottom:1px solid var(--line)}.topbar{height:72px;display:flex;align-items:center;gap:22px}.brand{display:flex;align-items:center;text-decoration:none;flex:0 0 auto;min-width:145px}.brand img{display:block;max-height:38px;width:auto;height:auto;max-width:210px;object-fit:contain}.brand-text{font-size:24px;font-weight:800;color:var(--navy);line-height:1.05}.brand-text span{color:#0b9eab}.brand-text 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var(--line);padding-bottom:15px}.drawer-close{background:var(--soft);border:0;border-radius:9px;font-size:28px;width:40px;height:40px;line-height:1}.drawer-group{padding:16px 0;border-bottom:1px solid var(--line)}.drawer-group h2{font-size:13px;text-transform:uppercase;color:var(--muted);margin-bottom:8px}.drawer-group a{display:block;padding:8px 0;text-decoration:none}.drawer-group a.is-current{font-weight:bold;color:var(--blue)}.hero{padding:56px 0 45px;background:linear-gradient(125deg,#fff 0%,#f0fbfc 100%)}.hero-grid{display:grid;grid-template-columns:1.12fr .88fr;gap:50px;align-items:center}.hero-copy p{max-width:600px}.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:24px}.text-link{display:inline-flex;align-items:center;font-weight:700;padding:8px 3px}.media{display:flex;align-items:center;justify-content:center;width:100%;min-width:0;overflow:hidden;border-radius:16px;background:var(--surface);padding:12px}.media img{display:block;width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain;object-position:center}.media--hero{height:clamp(250px,26vw,330px)}.media--feature{height:250px}.media--card{height:170px}.media--banner{height:220px}.media--mobile{height:350px;max-width:320px}.media--portrait{max-width:350px;margin-inline:auto}.media--wide{padding:8px}.media--missing{background:linear-gradient(135deg,#e6f4f8,#f2f9fb);border:1px solid #d6e9ed}.quick-strip{padding:18px 0;border-bottom:1px solid var(--line);background:white}.quick-strip__inner{display:flex;gap:28px;flex-wrap:wrap}.quick-strip__group{display:flex;align-items:center;gap:10px;flex-wrap:wrap;font-size:13px}.quick-strip strong{color:var(--navy)}.quick-strip a{color:var(--muted);white-space:nowrap}.topic-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:15px}.topic-card{padding:22px;border:1px solid var(--line);border-radius:12px;text-decoration:none;background:white;display:flex;flex-direction:column;min-height:160px;transition:border-color .15s,transform .15s}.topic-card:hover{border-color:var(--cyan);transform:translateY(-2px)}.topic-card strong{font-size:18px;color:var(--heading);margin-bottom:7px}.topic-card span{font-size:14px;color:var(--muted);line-height:1.65}.topic-card em{font-style:normal;color:var(--blue);margin-top:auto;padding-top:12px;font-size:13px}.editorial-grid{display:grid;grid-template-columns:2fr 1fr;gap:22px}.story-large,.story-stack article,.info-panel,.feature-panel{background:#fff;border:1px solid var(--line);border-radius:14px;padding:27px}.story-large{background:#f5fbfd}.story-stack{display:grid;gap:17px}.story-stack h3{font-size:19px}.story-large a,.story-stack a{font-weight:700}.feature-row{display:grid;grid-template-columns:1fr 1fr;gap:42px;align-items:center}.feature-row--reverse .media{order:-1}.feature-row 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var(--line);background:white;border-radius:12px;text-decoration:none;display:flex;flex-direction:column;gap:7px}.reading-links__grid strong{font-size:18px}.reading-links__grid span{font-size:14px;color:var(--muted)}.reading-links__grid span:last-child{color:var(--blue)}.faq-list{border-top:1px solid var(--line)}.faq-list details{border-bottom:1px solid var(--line);padding:15px 0}.faq-list summary{font-weight:700;color:var(--heading);cursor:pointer;padding:6px 26px 6px 2px}.faq-list details p{margin:10px 0 5px;max-width:760px}.note{background:var(--surface);border-left:4px solid var(--sky);padding:20px 24px;margin:20px 0;border-radius:0 10px 10px 0}.site-footer{background:var(--footer);color:#eaf7ff;padding-top:48px}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:65px}.footer-grid h2{color:#fff;font-size:17px}.footer-grid a{display:block;color:#d7eef6;margin:5px 0;font-size:14px}.footer-brand{font-size:23px;font-weight:800;color:white}.footer-brand 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@media(max-width:760px){.container{width:min(100% - 32px,1180px)}h1{font-size:30px}h2{font-size:23px}h3{font-size:18px}.hero{padding:34px 0}.hero-grid{grid-template-columns:1fr}.hero .media{order:-1}.feature-row,.editorial-grid,.content-grid{grid-template-columns:1fr}.aside-box{position:static}.feature-row--reverse .media{order:0}.topic-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.mini-grid,.matrix{grid-template-columns:1fr}.timeline{display:grid}.timeline>div+div{border-left:0;border-top:1px solid var(--line)}.reading-links__grid{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr;gap:25px}.footer-grid>div:first-child{grid-column:1/-1}.page-intro h1{font-size:29px}.section{padding:37px 0}.split-list{columns:1}}
@media(max-width:640px){.brand-text{font-size:20px}.topbar{gap:7px}.entry-button{font-size:13px;padding:7px 12px;min-width:84px}.hero h1{font-size:29px}.lead{font-size:16px}.media--hero{height:200px}.media--feature{height:180px}.media--card{height:145px}.media--banner{height:150px}.media--mobile{height:290px;max-width:250px}.section{padding:31px 0}.topic-card{padding:17px;min-height:160px}.topic-card strong{font-size:16px}.story-large,.story-stack article,.info-panel,.feature-panel{padding:20px}.gallery-grid{grid-template-columns:1fr}.quick-strip__inner{gap:9px}.quick-strip__group{font-size:12px}.footer-grid{grid-template-columns:1fr 1fr}.site-footer{padding-bottom:calc(65px + env(safe-area-inset-bottom))}.bottom-nav{position:fixed;bottom:0;left:0;right:0;z-index:40;display:grid;grid-template-columns:repeat(4,1fr);min-height:58px;padding-bottom:env(safe-area-inset-bottom);background:#fff;border-top:1px solid var(--line);box-shadow:0 -3px 20px #0b476012}.bottom-nav a{display:flex;align-items:center;justify-content:center;text-decoration:none;font-size:13px;font-weight:700;color:var(--navy)}.bottom-nav a[aria-current="page"]{color:var(--blue)}.back-top{bottom:calc(72px + env(safe-area-inset-bottom))}.footer-bottom{flex-wrap:wrap}.number-steps>div{padding-left:62px}}@media(max-height:480px) and (max-width:640px){.bottom-nav{position:static}.site-footer{padding-bottom:0}.back-top{bottom:15px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}