*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:90px}body{margin:0;background:#F6F8F8;color:#374D58;font:16px/1.8 Arial,"PingFang SC","Microsoft YaHei",sans-serif}a{color:#226D9D;text-decoration-thickness:1px;text-underline-offset:4px}a:hover{color:#168E96}a:focus-visible,summary:focus-visible,button:focus-visible{outline:3px solid #168E96;outline-offset:3px}h1,h2,h3{line-height:1.35;color:#193946;letter-spacing:.015em}h1{font-size:clamp(34px,3.2vw,42px);margin:0 0 22px}h2{font-size:clamp(24px,2.4vw,28px);margin:0 0 18px}h3{font-size:20px;margin:24px 0 10px}p{margin:0 0 17px}ul,ol{padding-left:1.5em}.container,.breadcrumb{max-width:1220px;margin:auto;padding-left:28px;padding-right:28px}.content{max-width:780px}.wide-content{max-width:1040px;margin-inline:auto}.site-header{background:#122E3B;color:white;position:relative;z-index:10}.header-inner{max-width:1220px;min-height:76px;margin:auto;padding:0 28px;display:flex;align-items:center;gap:18px}.brand{flex-shrink:0;color:white;text-decoration:none;display:flex;align-items:center;gap:8px}.brand small{font-size:10px;letter-spacing:.13em;color:#c8dce0;white-space:nowrap}.brand-word{font-size:20px;font-weight:750;white-space:nowrap}.brand .image-holder{margin:0;padding:0;background:transparent}.brand .image-holder img{max-height:38px}.desktop-nav{display:flex;justify-content:center;align-items:center;gap:clamp(7px,1vw,17px);margin-left:auto;min-width:0}.desktop-nav a{font-size:13px;white-space:nowrap;color:#d7e5e8;text-decoration:none;border-bottom:2px solid transparent;padding:24px 0 21px}.desktop-nav a[aria-current="page"]{color:white;font-weight:700;border-bottom-color:#5bd2cf}.desktop-nav a:hover{color:white}.entry-link{color:white;border:1px solid #6da7aa;border-radius:8px;padding:6px 12px;text-decoration:none;white-space:nowrap;font-size:13px}.entry-link:hover{color:white;background:#1A4050}.mobile-nav{display:none}.breadcrumb{font-size:13px;padding-top:18px;padding-bottom:18px;display:flex;gap:12px}.breadcrumb a{text-decoration:none}.site-main{padding-bottom:58px}.hero{display:grid;grid-template-columns:minmax(0,58fr) minmax(0,42fr);gap:35px;align-items:center}.hero,.feature-panel,.paper,.article,.info-strip{background:white;border:1px solid #D9E3E6;border-radius:12px;padding:30px}.hero{padding:32px}.eyebrow{color:#168E96;letter-spacing:.13em;text-transform:uppercase;font-weight:700;font-size:12px}.lead{font-size:18px;color:#314c59}.button-links,.inline-links,.related-links{display:flex;flex-wrap:wrap;gap:13px}.button-links a{background:#168E96;color:white;border-radius:7px;text-decoration:none;padding:9px 15px;font-size:14px}.button-links a+ a{background:#EAF0F2;color:#193946}.section{margin-top:58px}.section-heading{display:flex;justify-content:space-between;align-items:end;gap:20px;border-bottom:1px solid #D9E3E6;padding-bottom:16px;margin-bottom:24px}.section-heading h2{margin:0}.muted{color:#647981}.route-list{display:grid;grid-template-columns:1fr 1fr;gap:0 35px}.route-row{display:grid;grid-template-columns:40px 1fr;gap:16px;align-items:start;border-bottom:1px solid #D9E3E6;padding:20px 0}.route-row span{color:#168E96;font-size:25px;font-weight:bold}.route-row h3{margin:0 0 5px}.route-row p{margin:0}.feature-grid{display:grid;grid-template-columns:minmax(0,2fr) minmax(0,1fr);gap:30px}.side-notes{background:#EAF0F2;border-left:3px solid #168E96;padding:23px}.two-column{display:grid;grid-template-columns:1fr 1fr;gap:30px;align-items:center}.two-column>*{min-width:0}.text-panel{padding:14px 0}.note{border-left:3px solid #168E96;padding:10px 17px;background:#EAF0F2;color:#374D58;margin:20px 0}.steps{counter-reset:step;list-style:none;padding:0;display:grid;gap:12px}.steps li{counter-increment:step;display:grid;grid-template-columns:38px 1fr;align-items:start;gap:16px;padding:15px 0;border-bottom:1px solid #D9E3E6}.steps li::before{content:counter(step,decimal-leading-zero);color:#168E96;font-weight:700;font-size:20px}.section-intro{max-width:780px;margin:0 auto 38px}.section-intro .eyebrow{display:block;margin-bottom:9px}.article{max-width:780px;margin:0 auto}.article section+section{margin-top:42px;padding-top:28px;border-top:1px solid #D9E3E6}.article h2,.paper h2{margin-top:0}.image-holder{display:flex;align-items:center;justify-content:center;width:100%;min-width:0;padding:8px;background:#EAF0F2;border-radius:12px;margin:0 auto}.image-holder img{display:block;width:auto;height:auto;max-width:100%;max-height:var(--image-limit,210px);object-fit:contain;object-position:center}.image-holder--hero{--image-limit:290px}.image-holder--feature{--image-limit:240px}.image-holder--inline{--image-limit:180px}.image-holder--rules{--image-limit:210px}.image-holder--banner{--image-limit:190px}.image-holder--portrait{--image-limit:330px;max-width:310px}.image-holder--logo{--image-limit:38px}.image-fallback{background:#EAF0F2;border-radius:8px;padding:8px 12px;font-size:13px;color:#647981;margin:0}.table-scroll{overflow-x:auto;max-width:100%;margin:18px 0 24px;border:1px solid #D9E3E6;border-radius:8px}.data-table{border-collapse:collapse;width:100%;min-width:550px;font-size:15px}.data-table caption{text-align:left;font-weight:700;padding:10px 13px;color:#193946}.data-table th,.data-table td{padding:12px 14px;border-bottom:1px solid #D9E3E6;text-align:left;vertical-align:top}.data-table th{background:#EAF0F2;color:#193946}.editor-layout{display:grid;grid-template-columns:210px minmax(0,1fr);gap:35px;align-items:start}.index-rail{position:sticky;top:20px;padding:20px;background:#EAF0F2;border-radius:10px}.index-rail a{display:block;padding:6px 0;text-decoration:none}.index-rail h2{font-size:18px}.comparison{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}.comparison>section{padding:20px;background:#fff;border:1px solid #D9E3E6;border-radius:10px}.comparison h3{margin-top:0}.band{padding:35px 0;border-top:1px solid #D9E3E6}.band-dark{background:#1A4050;color:#e8f2f3;padding:28px;border-radius:12px}.band-dark h2{color:white}.mini-index{display:flex;gap:13px;flex-wrap:wrap;margin:22px 0}.mini-index a{padding:5px 11px;background:#EAF0F2;border-radius:6px}.related{max-width:1040px;margin:55px auto 0;padding:25px 0;border-top:2px solid #168E96}.related h2{font-size:23px}.related-links a{padding:9px 14px;border:1px solid #D9E3E6;background:white;border-radius:7px;text-decoration:none}.faq{margin-top:42px}.faq details{background:white;border-bottom:1px solid #D9E3E6;padding:13px 18px}.faq summary{font-weight:700;cursor:pointer;color:#193946}.faq details p{margin:12px 0 4px}.faq details:first-of-type{border-top:1px solid #D9E3E6}.site-footer{background:#0C2632;color:#b9cbd1;padding-top:38px;font-size:14px}.footer-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px}.footer-brand{color:white;font-size:22px;font-weight:700}.footer-brand small{font-size:11px;margin-left:9px;letter-spacing:.1em}.site-footer h2{font-size:16px;color:white}.footer-links{display:grid;grid-template-columns:1fr 1fr;gap:8px}.footer-links a{color:#d7e9eb;text-decoration:none}.copyright{padding:20px;border-top:1px solid #34515d;text-align:center;margin-top:25px;font-size:12px}.skip-link{position:absolute;top:-70px;background:white;padding:8px;z-index:30}.skip-link:focus{top:0}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}blockquote{border-left:4px solid #168E96;padding:9px 20px;margin:20px 0;background:#EAF0F2}section[id]{scroll-margin-top:90px}
@media(max-width:1120px){.header-inner{gap:10px;padding:0 22px}.desktop-nav a{font-size:12px}.brand small{display:none}.desktop-nav{gap:9px}}@media(max-width:980px){.header-inner{height:64px;min-height:64px;justify-content:space-between}.desktop-nav{display:none}.mobile-nav{display:block;position:relative;order:0}.brand{order:1;margin:auto}.brand small{display:block}.brand .image-holder img{max-height:30px}.entry-link{order:2}.mobile-nav>summary{display:grid;place-items:center;width:42px;height:42px;cursor:pointer;list-style:none;border:1px solid #5c8088;border-radius:8px;color:white;font-size:24px}.mobile-nav>summary::-webkit-details-marker{display:none}.mobile-panel{position:absolute;top:54px;left:-22px;width:100vw;background:#122E3B;border-top:1px solid #426671;padding:18px 22px 24px;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;box-shadow:0 9px 12px #08202a33}.mobile-nav-group strong{display:block;color:#6dd4d0;margin-bottom:7px}.mobile-nav-group a{color:white;display:block;padding:8px 0;text-decoration:none}.breadcrumb,.container{padding-left:22px;padding-right:22px}}
@media(max-width:760px){.hero,.two-column,.feature-grid,.editor-layout,.footer-grid{grid-template-columns:1fr}.index-rail{position:static}.section{margin-top:38px}.hero{gap:18px}.comparison{grid-template-columns:1fr}.article{max-width:none}.footer-grid{gap:20px}.route-list{grid-template-columns:1fr}.section-heading{align-items:start}}
@media(max-width:640px){body{font-size:15px;line-height:1.78}.container,.breadcrumb{padding-left:16px;padding-right:16px}.header-inner{padding:0 16px}.mobile-panel{left:-16px;padding:14px 16px;grid-template-columns:1fr;max-height:75vh;overflow-y:auto;gap:10px}.mobile-nav-group a{padding:5px 0}.brand-word{font-size:18px}.brand small{font-size:8px}.entry-link{font-size:12px;padding:6px 8px}h1{font-size:28px}h2{font-size:22px}.hero,.paper,.article,.feature-panel{padding:20px}.lead{font-size:16px}.image-holder--hero{--image-limit:195px}.image-holder--feature{--image-limit:180px}.image-holder--inline{--image-limit:140px}.image-holder--rules{--image-limit:165px}.image-holder--banner{--image-limit:125px}.image-holder--portrait{--image-limit:275px;max-width:240px}.steps li{gap:7px}.footer-links{grid-template-columns:1fr 1fr}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}