:root{--bg:#f6fafc;--surface:#fff;--soft:#eaf6fa;--subtle:#edf4f8;--cyan:#25c8d1;--sky:#25b6e8;--blue:#1787db;--navy:#174b78;--ink:#183a56;--body:#31485d;--muted:#687d8e;--line:#dce9f0;--footer:#123653;--shadow:0 10px 32px rgba(15,68,97,.055)}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:30px}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}img{max-width:100%;height:auto}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(--sky);outline-offset:3px}button{font:inherit;cursor:pointer}.container{width:min(100% - 56px,1180px);margin-inline:auto}.section{margin-block:54px}.section-header{max-width:760px;margin-bottom:24px}.eyebrow{display:inline-block;color:#167da9;font-size:13px;font-weight:700;letter-spacing:.09em;text-transform:uppercase}.muted{color:var(--muted)}h1,h2,h3{color:var(--ink);line-height:1.38;margin:0 0 16px}h1{font-size:clamp(32px,3.3vw,42px);letter-spacing:-.028em}h2{font-size:clamp(23px,2.35vw,27px)}h3{font-size:20px}p{margin:0 0 15px}p:last-child{margin-bottom:0}ul,ol{padding-left:1.4em}li{margin:7px 0}strong{color:var(--ink)}.lead{font-size:17px;line-height:1.85;max-width:800px}.skip-link{position:absolute;z-index:120;top:-60px;left:12px;padding:9px 18px;background:#fff}.skip-link:focus{top:8px}.site-header{background:white;border-bottom:1px solid var(--line);position:relative;z-index:30}.header-top{height:72px;display:flex;align-items:center;gap:28px}.brand{display:inline-flex;align-items:center;flex:0 1 auto;min-width:0;max-width:250px;text-decoration:none}.brand img{display:block;max-height:38px;max-width:250px;object-fit:contain;object-position:left center;width:auto}.brand-text{font-size:23px;font-weight:800;color:var(--navy);line-height:1.1;white-space:nowrap}.brand-text small{display:block;font-size:10px;letter-spacing:.14em}.header-tagline{margin:auto;color:var(--muted);font-size:13px;white-space:nowrap}.entry-button{margin-left:auto;display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:42px;padding:0 23px;border-radius:9px;background:#174b78;color:white;text-decoration:none;font-size:14px;font-weight:bold;white-space:nowrap}.entry-button:hover{background:#116994;color:white}.desktop-nav{background:var(--navy)}.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:10px;min-height:48px}.desktop-nav a{display:flex;align-items:center;justify-content:center;color:#e4f5fd;text-decoration:none;font-size:14px;line-height:1.4;min-height:48px;padding:0 8px;border-bottom:3px solid transparent;white-space:nowrap}.desktop-nav a:hover,.desktop-nav a[aria-current=page]{color:white;border-color:#42dce5}.menu-toggle{display:none;border:0;background:transparent;width:40px;height:40px;padding:10px;flex-direction:column;justify-content:space-around}.menu-toggle span{display:block;width:21px;height:2px;background:var(--ink)}.drawer-overlay{position:fixed;inset:0;z-index:89;background:rgba(14,38,58,.54);visibility:hidden;pointer-events:none}.drawer-overlay:not([hidden]){display:block}.mobile-drawer{position:fixed;z-index:90;top:0;bottom:0;left:0;width:min(86vw,344px);background:white;box-shadow:var(--shadow);padding:22px;transform:translateX(-110%);visibility:hidden;pointer-events:none;overflow:auto}.drawer-open .drawer-overlay{visibility:visible;pointer-events:auto}.drawer-open .mobile-drawer{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-heading{display:flex;justify-content:space-between;align-items:center;padding-bottom:14px;border-bottom:1px solid var(--line);font-size:18px}.drawer-close{width:42px;height:42px;font-size:28px;background:var(--soft);border:0;border-radius:10px;color:var(--ink)}.drawer-group{padding:16px 0;border-bottom:1px solid var(--line)}.drawer-group>span{display:block;font-size:12px;font-weight:bold;color:var(--muted);margin-bottom:4px}.drawer-group a{display:block;padding:8px 3px;text-decoration:none;font-size:15px}.bottom-nav{display:none}.back-top{position:fixed;bottom:25px;right:22px;z-index:20;border:1px solid var(--line);background:#fff;border-radius:50%;width:44px;height:44px;box-shadow:var(--shadow);color:var(--navy)}[hidden]{display:none!important}.button-link{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:9px 19px;border-radius:9px;font-size:14px;font-weight:bold;text-decoration:none;background:var(--navy);color:#fff}.button-link:hover{background:#116994;color:#fff}.button-link.secondary{background:var(--soft);color:var(--navy)}.button-link.secondary:hover{background:#d6eef4}.link-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}.hero{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);gap:40px;align-items:center;padding:48px 0 22px}.hero-copy p{max-width:625px}.hero .eyebrow{margin-bottom:15px}.media{display:flex;justify-content:center;align-items:center;width:100%;min-width:0;overflow:hidden;border-radius:14px;background:var(--soft);border:1px solid var(--line)}.media img{display:block;width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain;object-position:center}.media-placeholder{display:block;width:80%;height:75%;background:linear-gradient(135deg,#e2f3f6,#f8fcfd);border-radius:9px}.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.is-wide{background:#f5fbfd}.media.is-portrait{max-width:320px;margin-inline:auto}.quickbar{padding:19px 22px;background:white;border:1px solid var(--line);border-radius:14px;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.quick-group{display:flex;flex-wrap:wrap;gap:7px 13px;font-size:13px}.quick-group strong{width:100%;font-size:13px}.quick-group a{text-decoration:none}.topic-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.topic-card{display:flex;flex-direction:column;min-width:0;min-height:170px;padding:22px;border:1px solid var(--line);background:white;border-radius:12px;text-decoration:none;transition:transform .2s,border-color .2s}.topic-card:hover{border-color:#9fdde8;transform:translateY(-3px)}.topic-card strong{font-size:17px;margin-bottom:8px}.topic-card span{color:var(--muted);font-size:14px;line-height:1.65}.topic-card i{font-style:normal;color:var(--blue);margin-top:auto;padding-top:8px}.editor-grid{display:grid;grid-template-columns:1.7fr 1fr;gap:20px}.panel{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:27px}.panel.soft{background:var(--soft)}.panel p{line-height:1.85}.editor-side{display:grid;gap:20px}.editor-side .panel{padding:23px}.eyeline{height:3px;width:38px;background:var(--cyan);margin-bottom:19px}.split{display:grid;grid-template-columns:1fr 1fr;gap:36px;align-items:center}.split.reverse .media{order:-1}.steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;counter-reset:step}.step{padding:20px;background:#fff;border:1px solid var(--line);border-radius:12px}.step:before{counter-increment:step;content:'0' counter(step);display:block;color:#148fa5;font-weight:bold;margin-bottom:12px}.three-col{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.article-head{padding:49px 0 25px;max-width:900px}.article-head h1{font-size:clamp(29px,3vw,36px)}.article-head .eyebrow{margin-bottom:12px}.article-head .lead{font-size:17px}.article-layout{display:grid;grid-template-columns:minmax(0,760px) minmax(220px,240px);gap:38px;align-items:start}.article-body{min-width:0}.article-body h2,.content-block h2{margin-top:32px}.article-body h3{margin-top:20px}.article-body p{line-height:1.85}.article-body section+section{margin-top:31px}.aside-box{position:sticky;top:20px;background:var(--soft);padding:22px;border-radius:12px;border:1px solid var(--line);font-size:14px}.aside-box h2{font-size:19px}.aside-box li{margin:11px 0}.bullet-clean{list-style:none;padding:0;margin:0}.bullet-clean li{border-bottom:1px solid var(--line);padding:11px 0}.bullet-clean li:last-child{border:0}.table-scroll{overflow-x:auto;max-width:100%;border:1px solid var(--line);border-radius:12px;background:white}.data-table{border-collapse:collapse;width:100%;font-size:15px;min-width:530px}.data-table th,.data-table td{padding:14px 17px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line)}.data-table th{background:var(--soft);color:var(--ink);font-weight:bold}.data-table tr:last-child td{border-bottom:0}.timeline{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.timeline article{background:var(--surface);border-left:4px solid var(--cyan);border-radius:7px;padding:19px}.anchor-index{display:flex;flex-wrap:wrap;gap:11px;margin:21px 0}.anchor-index a{padding:8px 13px;border:1px solid var(--line);background:#fff;border-radius:8px;text-decoration:none;font-size:14px}.gallery-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.gallery-grid figure{margin:0;padding:16px;background:#fff;border:1px solid var(--line);border-radius:12px}.gallery-grid figcaption{font-size:14px;color:var(--muted);padding:10px 3px 2px}.section-soft{background:var(--soft);padding:40px 0;margin-block:50px}.related-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}.related-link{display:grid;grid-template-columns:1fr auto;gap:8px;text-decoration:none;border:1px solid var(--line);padding:20px;border-radius:12px;background:white}.related-link strong{grid-column:1/-1}.related-link span{font-size:13px;color:var(--muted)}.faq-list details{border:1px solid var(--line);border-radius:10px;background:#fff;padding:0 18px;margin:11px 0}.faq-list summary{cursor:pointer;padding:15px 0;color:var(--ink);font-weight:bold}.faq-list details p{border-top:1px solid var(--line);padding:14px 0;margin:0}.service-nav{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.service-nav a{padding:14px;background:white;border:1px solid var(--line);border-radius:8px;text-decoration:none}.notice{padding:17px 22px;background:var(--soft);border-left:4px solid var(--cyan);border-radius:5px;font-size:14px}.site-footer{background:var(--footer);color:#eaf7ff;padding:44px 0 19px;margin-top:60px}.footer-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:80px}.footer-title{font-weight:bold;font-size:22px;color:white}.footer-title small{font-size:12px;font-weight:normal;margin-left:10px}.site-footer strong{color:white}.footer-note{font-size:13px;line-height:1.8;color:#c5dce9;max-width:600px}.footer-links{display:flex;flex-wrap:wrap;gap:9px 18px;margin-top:15px}.site-footer a{color:#eaf7ff;font-size:14px}.footer-bottom{display:flex;justify-content:space-between;margin-top:34px;padding-top:17px;border-top:1px solid #41627b;font-size:13px;color:#c5dce9}
@media(max-width:980px){.container{width:calc(100% - 44px)}.header-top{height:64px;justify-content:space-between;gap:14px}.menu-toggle{display:flex;flex:0 0 40px}.brand{max-width:180px}.brand img{max-height:30px;max-width:180px}.brand-text{font-size:19px}.header-tagline,.desktop-nav{display:none}.entry-button{margin:0;font-size:13px;padding:0 12px;min-height:40px}.topic-grid{grid-template-columns:repeat(3,1fr)}.article-layout{grid-template-columns:minmax(0,1fr) 220px;gap:22px}.hero{gap:25px}}
@media(max-width:760px){.hero,.split,.editor-grid,.article-layout,.footer-grid{grid-template-columns:minmax(0,1fr)}.hero{gap:24px;padding-top:30px}.hero .media{order:-1}.split.reverse .media{order:0}.article-layout .aside-box{position:static}.quickbar{grid-template-columns:1fr 1fr}.topic-grid{grid-template-columns:repeat(2,1fr)}.three-col,.timeline,.related-list{grid-template-columns:1fr 1fr}.gallery-grid{grid-template-columns:1fr}.section{margin-block:38px}.footer-grid{gap:30px}.footer-bottom{gap:15px;flex-wrap:wrap}}
@media(max-width:640px){body{font-size:15px;line-height:1.78}.container{width:calc(100% - 32px)}h1{font-size:clamp(27px,7vw,31px)}h2{font-size:21px}h3{font-size:18px}.article-head h1{font-size:clamp(25px,6.3vw,29px)}.article-head{padding:29px 0 14px}.article-head .lead{font-size:15px}.lead{font-size:16px}.hero{gap:18px}.media--hero{height:200px}.media--feature{height:180px}.media--card{height:145px}.media--banner{height:150px}.media--mobile{height:290px;max-width:250px}.quickbar{grid-template-columns:1fr;gap:12px;padding:16px}.quick-group strong{width:auto;margin-right:8px}.topic-grid,.three-col,.timeline,.related-list{grid-template-columns:minmax(0,1fr)}.topic-card{min-height:unset;padding:17px}.panel{padding:19px}.section-soft{padding:30px 0}.steps{grid-template-columns:1fr 1fr}.step{padding:16px}.service-nav{grid-template-columns:1fr}.site-footer{margin-top:38px;padding-bottom:calc(83px + env(safe-area-inset-bottom))}.bottom-nav{position:fixed;bottom:0;left:0;right:0;z-index:25;display:grid;grid-template-columns:repeat(4,1fr);background:#fff;border-top:1px solid var(--line);padding:5px 0 calc(5px + env(safe-area-inset-bottom));box-shadow:0 -5px 18px rgba(0,0,0,.06)}.bottom-nav a{display:block;padding:9px 2px;text-align:center;text-decoration:none;font-size:13px;color:var(--navy)}.bottom-nav a[aria-current=page]{font-weight:bold;color:#087ea7}.back-top{bottom:calc(85px + env(safe-area-inset-bottom));right:14px}.footer-title small{display:block;margin:0}.footer-bottom{margin-top:22px}.header-top{gap:7px}.brand{max-width:calc(100% - 162px)}.brand img{max-width:100%}.entry-button{padding:0 9px;gap:3px;min-height:38px;font-size:12px}}
@media(max-width:380px){.brand-text{font-size:16px}.brand-text small{font-size:8px}.entry-button{font-size:11px}.steps{grid-template-columns:1fr}}
@media(max-height:490px) and (max-width:640px){.bottom-nav{position:static}.site-footer{padding-bottom:24px}.back-top{bottom:20px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important}}

.noscript-nav{display:flex;gap:10px;flex-wrap:wrap;padding-top:13px;padding-bottom:13px}.noscript-nav a{display:inline-block;background:#fff;border:1px solid var(--line);border-radius:8px;padding:5px 10px;text-decoration:none;font-size:14px}