:root{--bg:#f4f7fa;--paper:#fff;--soft:#eaf1f6;--mint:#e9f8f8;--nav:#102e46;--deep:#163c57;--cyan:#13b8c5;--blue:#237bd3;--heading:#18364b;--text:#344c60;--muted:#64798a;--line:#dce6ed;--footer:#0b2539;--max:1200px}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:22px}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.8 Arial,'PingFang SC','Microsoft YaHei',sans-serif;overflow-x:hidden}button,input{font:inherit}a{color:#1468ae;text-underline-offset:4px}a:hover{color:#0b8994}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--cyan);outline-offset:3px}h1,h2,h3{color:var(--heading);line-height:1.38;letter-spacing:-.025em;margin:0 0 .7em}h1{font-size:clamp(2rem,3vw,2.75rem)}h2{font-size:clamp(1.45rem,2vw,1.75rem)}h3{font-size:1.2rem}p{margin:.65em 0 1.15em}small,.eyebrow{font-size:.85rem}.eyebrow{font-weight:700;letter-spacing:.1em;color:#0b848d;text-transform:uppercase}.container{width:min(var(--max),calc(100% - 56px));margin-inline:auto}.section{margin-block:64px}.section-tight{margin-block:44px}.read-col{max-width:790px}.narrow{max-width:740px}.lead{font-size:1.1rem;line-height:1.85;color:#425c6c}.muted{color:var(--muted)}.site-header{position:relative;z-index:30}.brand-bar{background:#fff;border-bottom:1px solid var(--line)}.brand-inner{height:72px;display:flex;align-items:center;gap:18px}.brand{display:flex;align-items:center;gap:10px;flex:0 1 auto;min-width:0;text-decoration:none;color:var(--heading)}.logo-holder{display:block;max-width:230px}.logo-holder .media-frame{border:none;background:none;padding:0;min-height:0}.logo-holder img{max-height:38px}.brand-fallback{font-weight:900;font-size:1.2rem;white-space:nowrap}.brand-tagline{font-size:.83rem;color:var(--muted);margin-right:auto}.brand-tagline i{color:#8ca6b5;font-style:normal;padding:0 5px}.entry-button,.button-link{background:var(--deep);border:1px solid transparent;color:#fff;text-decoration:none;border-radius:8px;display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:7px 20px;font-size:.93rem;font-weight:700;white-space:nowrap}.entry-button:hover,.button-link:hover{background:#075e76;color:#fff}.button-link.secondary{background:var(--mint);color:var(--deep);border-color:#a8dce0}.desktop-nav{background:var(--nav)}.nav-inner{height:50px;display:flex;justify-content:space-between;align-items:stretch;gap:6px}.desktop-nav a{display:flex;align-items:center;color:#e8f3fb;text-decoration:none;font-weight:600;font-size:.94rem;white-space:nowrap;padding:0 12px;border-bottom:3px solid transparent}.desktop-nav a:hover{color:#fff;background:#1b4462}.desktop-nav a[aria-current=page]{border-bottom-color:var(--cyan);font-weight:800;color:#fff}.menu-button,.mobile-menu,.menu-overlay,.mobile-shortcuts{display:none}.skip-link{position:absolute;left:10px;top:-100px;background:#fff;z-index:90;padding:8px}.skip-link:focus{top:8px}.site-main{min-height:65vh}.hero{padding:56px 0 30px}.hero-grid{display:grid;grid-template-columns:minmax(0,1.08fr) minmax(0,1fr);gap:36px;align-items:center}.hero h1{font-size:clamp(2.05rem,3.2vw,2.75rem)}.hero-intro{max-width:650px}.action-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}.media-frame{width:100%;min-width:0;margin:0;padding:10px;border-radius:14px;background:var(--soft);display:flex;justify-content:center;align-items:center;--media-limit:220px}.media-frame img{display:block;width:auto;height:auto;max-width:100%;max-height:var(--media-limit);object-fit:contain;object-position:center}.media-frame--hero{--media-limit:310px}.media-frame--feature{--media-limit:250px}.media-frame--card{--media-limit:185px}.media-frame--mobile{--media-limit:350px;max-width:320px}.media-frame--banner{--media-limit:210px}.media-frame--logo{--media-limit:38px}.media-missing{min-height:115px;border:1px dashed #b5ccd8;color:#688392;font-size:.86rem;text-align:center}.media-frame--hero.media-missing{min-height:200px}.media-frame--logo.media-missing{min-height:0;border:0;background:transparent;padding:0}.media-frame--logo.media-missing span{display:none}.topic-index{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 38px}.topic-row{border-top:1px solid var(--line);padding:22px 6px 21px 0;min-width:0}.topic-row h3{margin-bottom:7px}.topic-row p{font-size:.95rem;margin:0 0 8px}.topic-row a,.text-link{font-weight:700}.feature-grid{display:grid;grid-template-columns:minmax(0,2fr) minmax(0,1fr);gap:24px}.feature-main,.feature-side,.panel{background:#fff;border:1px solid var(--line);border-radius:14px;padding:26px}.feature-main{border-top:4px solid var(--cyan)}.feature-side article+article{padding-top:18px;margin-top:18px;border-top:1px solid var(--line)}.feature-side h3{font-size:1.12rem}.feature-side p{font-size:.94rem}.split{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:34px;align-items:center}.split--image-first{grid-template-columns:minmax(0,1.05fr) minmax(0,1.15fr)}.band{background:var(--soft);padding:42px 0;margin-block:54px}.band--dark{background:var(--deep);color:#e4f5fb}.band--dark h2,.band--dark h3{color:white}.band--dark a{color:#9cecf0}.mini-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.mini-block{background:#fff;border-left:3px solid var(--cyan);padding:22px 23px}.mini-block h3{margin:0 0 8px}.mini-block p{margin:0}.steps{counter-reset:step;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.step{position:relative;padding:21px;background:#fff;border:1px solid var(--line);border-top:3px solid var(--cyan);border-radius:10px}.step::before{counter-increment:step;content:'0' counter(step);display:block;color:#168695;font-weight:900;font-size:1.25rem;margin-bottom:7px}.step h3{font-size:1.05rem;margin:0 0 7px}.step p{font-size:.93rem;margin:0}.editor-note{padding:20px 24px;border-left:4px solid var(--blue);background:#fff}.page-top{padding:44px 0 28px;background:#fff;border-bottom:1px solid var(--line)}.page-top h1{font-size:clamp(2rem,2.65vw,2.3rem);max-width:920px}.page-top .lead{max-width:850px}.crumbs{display:flex;gap:10px;align-items:center;font-size:.83rem;margin-bottom:17px;color:var(--muted)}.crumbs a{color:#41718a}.anchor-nav{display:flex;gap:10px;flex-wrap:wrap;margin-top:23px}.anchor-nav a{padding:6px 14px;background:var(--soft);border:1px solid var(--line);border-radius:40px;text-decoration:none;font-size:.9rem}.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:44px;align-items:start}.article-layout>*{min-width:0}.article-layout aside{background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px;font-size:.91rem}.article-layout aside h3{font-size:1.05rem}.article-layout aside a{display:block;margin:8px 0}.prose>section{margin-bottom:48px}.prose ul,.prose ol{padding-left:1.35em}.prose li{margin:.45em 0}.table-scroll{max-width:100%;overflow-x:auto;border:1px solid var(--line);border-radius:12px;background:white}.data-table{width:100%;border-collapse:collapse;min-width:600px;font-size:.94rem}.data-table caption{text-align:left;font-weight:700;padding:15px 17px;color:var(--heading)}.data-table th,.data-table td{padding:13px 16px;border-top:1px solid var(--line);text-align:left;vertical-align:top}.data-table th{background:var(--soft);color:var(--heading)}.data-table td:first-child{font-weight:700;color:var(--heading)}.callout{padding:18px 23px;background:var(--mint);border-left:4px solid var(--cyan);margin:22px 0}.callout p:last-child{margin-bottom:0}.flow-vertical{counter-reset:flow;border-left:2px solid #b7dce4;margin-left:17px;padding-left:27px}.flow-vertical>div{position:relative;padding:3px 0 18px}.flow-vertical>div::before{counter-increment:flow;content:counter(flow);position:absolute;left:-42px;top:0;width:28px;height:28px;display:grid;place-items:center;border-radius:50%;color:#fff;background:var(--deep);font-weight:bold;font-size:.84rem}.matrix{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.matrix>article{padding:22px;background:#fff;border:1px solid var(--line);border-radius:12px}.gallery-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:26px;align-items:start}.gallery-grid article:nth-child(2){margin-top:52px}.gallery-grid .media-frame{margin:0 0 17px}.read-article{max-width:800px}.faq details{border-bottom:1px solid var(--line);background:#fff;padding:0 20px}.faq details:first-of-type{border-top:1px solid var(--line)}.faq summary{cursor:pointer;padding:18px 0;color:var(--heading);font-weight:700;line-height:1.5}.faq details p{margin:0 0 20px}.service-layout{display:grid;grid-template-columns:245px minmax(0,1fr);gap:38px;align-items:start}.service-menu{background:#fff;padding:23px;border:1px solid var(--line);border-radius:12px;position:sticky;top:16px}.service-menu a{display:block;padding:5px 0}.related{margin-block:55px;padding:26px 28px;border-top:3px solid var(--cyan);background:white}.related h2{font-size:1.35rem}.related-links{display:flex;flex-wrap:wrap;gap:12px 23px}.related-links a{font-weight:700}.site-footer{background:var(--footer);color:#dcecf5;margin-top:58px}.footer-grid{display:grid;grid-template-columns:2fr 1fr;gap:70px;padding:42px 0}.footer-name{font-size:1.45rem;font-weight:800;color:#fff}.footer-name small{font-size:.7rem;letter-spacing:.12em;color:#94c8d7;margin-left:5px}.footer-note{font-size:.88rem;color:#b2cbd9;max-width:750px}.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 16px;margin-top:13px}.site-footer a{color:#dcecf5;text-decoration:none}.footer-bottom{border-top:1px solid #365061;padding:16px 0 24px;display:flex;justify-content:space-between;gap:12px;font-size:.79rem;color:#a9c0cc}.back-top{position:fixed;right:18px;bottom:18px;width:43px;height:43px;background:var(--deep);color:#fff;border:0;border-radius:50%;cursor:pointer;z-index:15;box-shadow:0 4px 14px #152b3d36}.back-top[hidden]{display:none}@media(max-width:1020px){.container{width:calc(100% - 44px)}.desktop-nav a{padding:0 8px;font-size:.87rem}.brand-tagline{font-size:.75rem}.article-layout{grid-template-columns:minmax(0,1fr) 220px;gap:24px}}@media(max-width:920px){.brand-inner{height:62px;display:grid;grid-template-columns:40px minmax(0,1fr) auto;gap:12px}.menu-button{display:flex;flex-direction:column;justify-content:center;align-items:center;gap:5px;width:40px;height:40px;background:transparent;border:1px solid var(--line);border-radius:8px;cursor:pointer}.menu-button span{width:19px;height:2px;background:var(--nav)}.brand{justify-content:center}.brand-tagline,.desktop-nav{display:none}.logo-holder{max-width:190px}.logo-holder img{max-height:30px}.brand-fallback{font-size:1rem}.entry-button{font-size:.83rem;padding:7px 11px;min-height:39px}.mobile-menu{display:flex;position:fixed;left:0;top:0;bottom:0;z-index:51;width:min(86vw,340px);background:#fff;flex-direction:column;padding:20px 22px 30px;box-shadow:12px 0 38px #07182524;overflow-y:auto;transform:translateX(-110%);visibility:hidden;pointer-events:none;transition:transform .22s ease,visibility .22s}.mobile-menu a{padding:9px 12px;text-decoration:none;border-radius:7px;color:var(--heading)}.mobile-menu a[aria-current=page]{font-weight:800;background:var(--soft)}.menu-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:14px}.menu-close{background:var(--soft);border:0;border-radius:7px;width:39px;height:39px;font-size:1.6rem;line-height:1;cursor:pointer}.menu-group{color:var(--muted);font-size:.78rem;font-weight:800;letter-spacing:.15em;margin:17px 0 4px}.menu-overlay{display:block;position:fixed;inset:0;background:#071c2a8a;z-index:50;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .22s,visibility .22s}.menu-open{overflow:hidden}.menu-open .mobile-menu{visibility:visible;pointer-events:auto;transform:translateX(0)}.menu-open .menu-overlay{visibility:visible;pointer-events:auto;opacity:1}.nojs-nav{display:flex;flex-wrap:wrap;gap:8px;padding:12px 0}.nojs-nav a{font-size:.9rem;padding:4px 6px}.mobile-shortcuts{display:flex;flex-wrap:wrap;justify-content:center;gap:10px 25px;padding:20px 0 0;font-size:.85rem}.hero{padding-top:35px}}@media(max-width:760px){.container{width:calc(100% - 32px)}.section{margin-block:42px}.band{padding:28px 0;margin-block:38px}.hero-grid,.split,.split--image-first,.feature-grid,.article-layout,.service-layout,.footer-grid{grid-template-columns:1fr}.article-layout aside{order:2}.service-menu{position:static;order:2}.hero-grid{gap:24px}.topic-index{gap:0 16px}.mini-grid,.matrix{grid-template-columns:1fr}.steps{grid-template-columns:repeat(2,minmax(0,1fr))}.gallery-grid{grid-template-columns:1fr}.gallery-grid article:nth-child(2){margin-top:0}.footer-grid{gap:24px;padding:32px 0}.footer-bottom{flex-direction:column}.page-top{padding:29px 0 22px}.feature-main,.feature-side,.panel{padding:20px}.hero .media-frame{max-width:720px}}@media(max-width:640px){body{font-size:15.5px}h1,.hero h1{font-size:clamp(1.75rem,7.2vw,2rem)}h2{font-size:1.38rem}h3{font-size:1.1rem}.page-top h1{font-size:clamp(1.6rem,6.7vw,1.85rem)}.topic-index{grid-template-columns:1fr}.topic-row{padding:17px 0}.media-frame--hero{--media-limit:205px}.media-frame--feature{--media-limit:185px}.media-frame--card{--media-limit:145px}.media-frame--mobile{--media-limit:285px;max-width:250px}.media-frame--banner{--media-limit:135px}.media-frame--logo{--media-limit:30px}.steps{grid-template-columns:1fr}.action-row a{flex:1 1 auto}.table-scroll{margin-inline:0}.brand-fallback{font-size:.9rem}.logo-holder{max-width:138px}.brand{gap:4px}.entry-button{padding:6px 9px}.related{padding:20px 16px}}@media(max-width:370px){.brand-inner{gap:5px;grid-template-columns:40px minmax(0,1fr) auto}.brand-fallback{font-size:.82rem}.logo-holder{max-width:115px}.entry-button{font-size:.79rem;padding:6px 7px}.container{width:calc(100% - 32px)}}@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}
