:root{--bg:#F4F7FA;--paper:#fff;--tint:#EAF1F6;--mint:#E9F8F8;--navy:#102E46;--deep:#163C57;--cyan:#13B8C5;--blue:#237BD3;--heading:#18364B;--body:#344C60;--muted:#64798A;--line:#DCE6ED;--radius:14px}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;color:var(--body);font:16px/1.8 Arial,'PingFang SC','Microsoft YaHei',sans-serif;background:var(--bg);overflow-x:clip}a{color:var(--blue);text-underline-offset:4px}a:hover{color:#0b566f}button{font:inherit;cursor:pointer}img{max-width:100%}h1,h2,h3,p,figure{margin-top:0}h1,h2,h3{color:var(--heading);line-height:1.38}h1{font-size:clamp(29px,3vw,40px);letter-spacing:-.025em}h2{font-size:clamp(22px,2.2vw,27px)}h3{font-size:19px}p{margin-bottom:17px}section{scroll-margin-top:25px}.container{max-width:1256px;margin-inline:auto;padding-inline:28px}.main-content{padding-block:28px 80px;min-height:58vh}.section{margin-top:58px}.section-heading{margin-bottom:24px}.section-heading p{max-width:760px}.eyebrow{color:#057989;font-weight:800;letter-spacing:.1em;font-size:13px;text-transform:uppercase;margin-bottom:9px}.lead{font-size:17px;max-width:790px;line-height:1.85}.muted{color:var(--muted)}.small{font-size:14px}.skip-link{position:absolute;top:-80px;z-index:100;color:white;background:var(--navy);padding:8px 16px}.skip-link:focus{top:4px}:focus-visible{outline:3px solid var(--cyan);outline-offset:3px}.site-header{position:relative;z-index:10;background:#fff}.brand-bar{border-bottom:1px solid var(--line)}.brand-inner{height:72px;display:flex;align-items:center;gap:18px;min-width:0}.brand{display:flex;align-items:center;flex:0 1 auto;min-width:0;text-decoration:none;color:var(--navy)}.brand img{display:block;width:auto;max-width:210px;max-height:38px;height:auto;object-fit:contain}.brand strong{line-height:1.1;font-size:23px;color:var(--navy)}.brand small,.footer-brand small{display:block;font-size:10px;letter-spacing:2px}.brand-note{font-size:13px;color:var(--muted);margin-right:auto}.entry-btn{margin-left:auto;white-space:nowrap;text-decoration:none;background:var(--navy);color:white;padding:8px 22px;border-radius:9px;font-size:14px;font-weight:700}.entry-btn:hover{background:#235676;color:#fff}.desktop-nav{background:var(--navy)}.nav-inner{height:50px;display:flex;align-items:stretch;justify-content:space-between;gap:6px}.nav-inner a{display:flex;align-items:center;justify-content:center;min-width:0;padding:0 14px;border-bottom:3px solid transparent;text-decoration:none;color:#e8f1f5;font-size:15px;white-space:nowrap}.nav-inner a:hover,.nav-inner a.is-current{color:white;background:rgba(255,255,255,.08)}.nav-inner a.is-current{font-weight:800;border-bottom-color:var(--cyan)}.menu-trigger,.drawer,.drawer-mask,.mobile-shortcuts{display:none}.nojs-nav{display:none}.crumb{display:flex;gap:12px;align-items:center;font-size:13px;color:var(--muted);margin-bottom:24px}.crumb a{color:var(--muted)}.page-intro{background:linear-gradient(110deg,#fff,#EAF1F6);border:1px solid var(--line);border-radius:var(--radius);padding:38px 44px;margin-bottom:30px}.page-intro h1{font-size:clamp(26px,2.8vw,35px);margin-bottom:14px}.page-intro .lead{margin-bottom:0}.hero{display:grid;grid-template-columns:1.05fr .95fr;gap:30px;align-items:center;padding:38px 42px;background:#fff;border:1px solid var(--line);border-radius:var(--radius)}.hero h1{font-size:clamp(29px,3.6vw,43px);margin-bottom:20px}.hero p{max-width:570px}.hero .eyebrow{margin-bottom:12px}.actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}.btn{display:inline-flex;align-items:center;justify-content:center;border-radius:9px;background:var(--navy);color:#fff;text-decoration:none;padding:11px 19px;font-weight:700;font-size:14px}.btn:hover{color:#fff;background:#235676}.btn-outline{background:#e8f7f9;color:var(--navy)}.btn-outline:hover{color:var(--navy);background:#c9f0f2}.media-frame{display:flex;align-items:center;justify-content:center;margin:0;min-width:0;max-width:100%;padding:10px;border-radius:var(--radius);background:var(--tint);--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--wide{--media-limit:210px}.media-placeholder{display:flex;align-items:center;justify-content:center;color:var(--muted);text-align:center;width:100%;min-height:125px;padding:22px;border:1px dashed #b9cbd7;border-radius:10px;font-size:13px}.media-frame--hero .media-placeholder{min-height:230px}.topic-directory{display:grid;grid-template-columns:1fr 1fr;gap:0 45px;border-top:2px solid var(--navy)}.topic-item{display:grid;grid-template-columns:44px 1fr;gap:14px;padding:22px 0;border-bottom:1px solid var(--line);min-width:0}.topic-index{color:#0696a3;font-size:21px;font-weight:800}.topic-item h3{margin-bottom:8px}.topic-item p{font-size:15px;margin-bottom:9px}.topic-item a{font-weight:700}.feature-grid{display:grid;grid-template-columns:2fr 1fr;gap:22px}.feature-main{background:var(--deep);color:#dcebf3;padding:35px;border-radius:var(--radius)}.feature-main h3,.dark-band h2,.dark-band h3{color:#fff}.feature-main p{max-width:680px}.feature-main a,.dark-band a{color:#a5eff2}.feature-side{display:grid;gap:18px}.note-card{padding:25px;background:#fff;border:1px solid var(--line);border-radius:var(--radius)}.note-card h3{margin-bottom:8px}.note-card p:last-child{margin-bottom:0}.split{display:grid;grid-template-columns:1fr 1fr;gap:38px;align-items:center}.split--text-heavy{grid-template-columns:1.3fr .7fr}.split--image-left{grid-template-columns:.85fr 1.15fr}.split p:last-child{margin-bottom:0}.plain-band{padding:30px 35px;border-left:4px solid var(--cyan);background:var(--mint)}.dark-band{padding:37px 41px;background:var(--deep);color:#e0edf4;border-radius:var(--radius)}.three-columns{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.step-list{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:15px;counter-reset:steps;list-style:none;padding:0;margin:0}.step-list li{counter-increment:steps;padding:21px;background:white;border-top:3px solid var(--cyan);border-radius:0 0 12px 12px}.step-list li:before{content:'0' counter(steps);display:block;font-weight:800;color:#058b99;font-size:22px;margin-bottom:5px}.step-list strong{display:block;color:var(--heading)}.step-list a{font-weight:700}.article{max-width:790px}.article p{line-height:1.85}.article h2{margin-top:38px}.article h3{margin-top:25px}.article-wide{max-width:980px}.article-feature{padding:26px 31px;background:#fff;border:1px solid var(--line);border-radius:var(--radius)}.two-rail{display:grid;grid-template-columns:minmax(0,1fr) 270px;gap:38px;align-items:start}.fact-index{padding:23px;background:#eaf1f6;border-radius:12px}.fact-index ul{padding-left:19px;margin-bottom:0}.fact-index a{color:var(--navy)}.anchor-nav{display:flex;gap:10px;flex-wrap:wrap;margin:0 0 24px}.anchor-nav a{text-decoration:none;border:1px solid #b9d5df;background:white;border-radius:8px;padding:8px 16px;font-size:14px;font-weight:700}.anchor-nav a:hover{background:var(--mint)}.table-scroll{overflow-x:auto;max-width:100%;border:1px solid var(--line);border-radius:12px;background:#fff}.comparison{border-collapse:collapse;min-width:620px;width:100%;line-height:1.65;font-size:15px}.comparison caption{padding:16px 18px;color:var(--heading);text-align:left;font-weight:800;font-size:17px}.comparison th,.comparison td{padding:14px 18px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}.comparison thead th{background:var(--navy);color:#fff}.comparison tbody th{background:#edf4f7;color:var(--heading);font-weight:800}.comparison tr:last-child td,.comparison tr:last-child th{border-bottom:0}.timeline{padding-left:0;list-style:none;border-left:2px solid var(--cyan);margin-left:15px}.timeline li{position:relative;padding:0 0 25px 28px}.timeline li:before{content:'';position:absolute;left:-8px;top:7px;width:13px;height:13px;border-radius:50%;background:var(--cyan);box-shadow:0 0 0 4px var(--bg)}.timeline strong{display:block;color:var(--heading);font-size:18px}.timeline p{margin-bottom:0}.tag{color:#057989;font-size:12px;letter-spacing:.07em;font-weight:800}.gallery{display:grid;grid-template-columns:1fr 1fr;gap:26px}.gallery article{background:#fff;border:1px solid var(--line);padding:21px;border-radius:12px}.gallery article:nth-child(2){margin-top:34px}.gallery article:last-child{grid-column:1/-1;max-width:790px}.gallery h3{margin:17px 0 8px}.wide-copy{max-width:890px;margin:auto}.service-layout{display:grid;grid-template-columns:245px minmax(0,1fr);gap:35px}.service-nav{position:sticky;top:20px;background:#eaf1f6;padding:24px;border-radius:12px}.service-nav a{display:block;color:var(--deep);padding:8px 0;text-decoration:none;border-bottom:1px solid #d6e1e7;font-size:14px}.service-content{min-width:0}.service-content>section{margin-bottom:45px}.faq details{margin-bottom:11px;border:1px solid var(--line);background:#fff;border-radius:10px;padding:0 19px}.faq summary{font-weight:700;color:var(--heading);padding:15px 0;cursor:pointer}.faq details[open] summary{border-bottom:1px solid var(--line)}.faq details p{padding-top:15px}.related{margin-top:60px;border-top:2px solid var(--navy);padding-top:25px}.related-links{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.related-links a{background:#fff;border:1px solid var(--line);padding:18px;border-radius:9px;font-weight:700;text-decoration:none}.related-links a span{color:var(--cyan)}.site-footer{background:#0B2539;color:#DCECF5;padding:48px 0 20px}.footer-grid{display:grid;grid-template-columns:1.3fr 1fr;gap:65px}.footer-brand{font-size:25px;color:#fff}.footer-grid p{font-size:14px;max-width:620px;margin-top:14px}.footer-fine{color:#b6ccd7}.footer-links{display:grid;grid-template-columns:repeat(2,1fr);gap:3px 18px;align-content:start}.footer-links a{color:#dcecf5;text-decoration:none;font-size:14px;padding:5px 0}.footer-links a:hover{color:#a4f1f1}.footer-bottom{margin-top:30px;padding-top:18px;border-top:1px solid #325065;color:#a8c0cd;font-size:12px}.to-top{position:fixed;bottom:22px;right:22px;background:var(--navy);color:#fff;border:0;border-radius:50%;width:44px;height:44px;opacity:0;visibility:hidden;transition:opacity .2s;z-index:4}.to-top.is-visible{opacity:1;visibility:visible}@media(max-width:1100px){.container{padding-inline:22px}.nav-inner a{padding-inline:9px;font-size:14px}.section{margin-top:48px}}@media(max-width:920px){.brand-inner{height:62px;justify-content:space-between;gap:12px}.brand-note,.desktop-nav{display:none}.brand{margin-inline:auto;max-width:calc(100% - 205px)}.brand img{max-height:30px;max-width:100%}.brand strong{font-size:20px}.brand small{font-size:8px}.entry-btn{height:40px;display:flex;align-items:center;justify-content:center;padding:0 13px;font-size:12px;margin-left:0}.menu-trigger{display:flex;flex:0 0 40px;width:40px;height:40px;flex-direction:column;gap:5px;align-items:center;justify-content:center;background:#edf4f7;border:1px solid var(--line);border-radius:8px}.menu-trigger span{display:block;background:var(--navy);width:19px;height:2px}.drawer-mask{display:block;position:fixed;inset:0;background:rgba(2,19,31,.54);opacity:0;visibility:hidden;pointer-events:none;z-index:20;transition:opacity .2s,visibility .2s}.drawer{display:block;position:fixed;top:0;bottom:0;left:0;width:min(86vw,340px);background:white;transform:translateX(-105%);visibility:hidden;pointer-events:none;z-index:21;overflow-y:auto;padding:20px 24px 32px;transition:transform .22s,visibility .22s;box-shadow:6px 0 25px #1235}.drawer-open{overflow:hidden}.drawer-open .drawer-mask{opacity:1;visibility:visible;pointer-events:auto}.drawer-open .drawer{visibility:visible;pointer-events:auto;transform:translateX(0)}.drawer-head{display:flex;align-items:center;justify-content:space-between;color:var(--heading);font-size:20px;margin-bottom:24px}.drawer-head button{font-size:27px;background:var(--tint);border:0;border-radius:8px;width:40px;height:40px}.drawer-caption{font-size:12px;letter-spacing:.09em;color:#067989;margin:24px 0 8px;font-weight:800}.drawer>a{display:block;text-decoration:none;color:var(--heading);padding:11px 9px;border-bottom:1px solid var(--line);font-weight:700}.nojs-nav{display:flex;gap:14px;padding:12px 18px;overflow-x:auto;background:#eaf1f6}.nojs-nav a{white-space:nowrap;font-size:13px}.mobile-shortcuts{display:flex;gap:15px;flex-wrap:wrap;padding-bottom:25px}.mobile-shortcuts a{font-size:13px}.main-content{padding-top:23px}.hero{padding:30px}.hero h1{font-size:33px}}@media(max-width:760px){.container{padding-inline:20px}.hero,.split,.split--text-heavy,.split--image-left,.feature-grid,.two-rail,.service-layout,.footer-grid{grid-template-columns:1fr}.split{gap:20px}.hero .media-frame{margin-top:4px}.three-columns{grid-template-columns:1fr 1fr}.step-list{grid-template-columns:1fr 1fr}.fact-index{max-width:none}.service-nav{position:static;order:2}.service-content{order:1}.gallery article:nth-child(2){margin-top:0}}@media(max-width:640px){body{font-size:15px}.container{padding-inline:16px}.main-content{padding-bottom:50px}.section{margin-top:36px}.hero{padding:23px 19px;gap:24px}.hero h1{font-size:29px}.lead{font-size:15px}.page-intro{padding:25px 20px}.page-intro h1{font-size:27px}.topic-directory,.three-columns,.step-list,.gallery,.related-links{grid-template-columns:1fr}.topic-item{padding:15px 0}.feature-main,.dark-band{padding:25px 21px}.plain-band{padding:21px}.note-card{padding:18px}.gallery article:last-child{grid-column:auto}.article-feature{padding:22px 20px}.media-frame--hero{--media-limit:205px}.media-frame--feature{--media-limit:185px}.media-frame--card{--media-limit:145px}.media-frame--wide{--media-limit:135px}.media-frame--mobile{--media-limit:285px;max-width:250px;margin-inline:auto}.site-footer{padding-top:35px}.footer-grid{gap:25px}.footer-links{grid-template-columns:1fr 1fr}.related{margin-top:42px}.comparison{font-size:14px}.comparison th,.comparison td{padding:11px 12px}.media-placeholder{min-height:100px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}
