:root{--bg:#F6F8F8;--white:#fff;--light:#EAF0F2;--navy:#122E3B;--panel:#1A4050;--accent:#168E96;--link:#226D9D;--title:#193946;--text:#374D58;--muted:#647981;--line:#D9E3E6;--footer:#0C2632}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:90px}body{margin:0;background:var(--bg);color:var(--text);font-family:Arial,'PingFang SC','Microsoft YaHei',sans-serif;font-size:16px;line-height:1.82}img{max-width:100%}a{color:var(--link);text-underline-offset:3px}a:hover{color:var(--accent)}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid #42B8C0;outline-offset:3px}.container{width:min(1220px,calc(100% - 56px));margin-inline:auto;min-width:0}.skip-link{position:absolute;left:12px;top:-80px;z-index:40;background:#fff;padding:10px}.skip-link:focus{top:12px}.site-header{background:var(--navy);color:#fff;position:relative;z-index:5}.header-inner{height:76px;width:min(1220px,calc(100% - 56px));margin:auto;display:flex;align-items:center;gap:23px;min-width:0}.brand{display:flex;align-items:center;gap:8px;flex-shrink:0}.brand a{display:flex;align-items:center;text-decoration:none;color:#fff}.brand img{display:block;width:auto;height:auto;max-height:38px;max-width:145px;object-fit:contain}.brand-fallback{font-size:20px;font-weight:bold}.brand small{color:#b4ced4;font-size:10px;letter-spacing:.12em;white-space:nowrap}.desktop-nav{display:flex;gap:clamp(8px,1.2vw,19px);align-items:center;justify-content:center;margin-left:auto;min-width:0}.desktop-nav a{font-size:13px;white-space:nowrap;text-decoration:none;color:#d8e6e8;border-bottom:2px solid transparent;padding:25px 0 22px}.desktop-nav a[aria-current=page]{color:#fff;border-color:#69d4d4;font-weight:700}.register-link{flex-shrink:0;background:var(--accent);border-radius:7px;padding:6px 12px;color:#fff;font-size:13px;font-weight:700;text-decoration:none;white-space:nowrap}.register-link:hover{color:#fff;background:#127880}.mobile-menu{display:none}.breadcrumb{font-size:13px;padding:18px 0 12px;color:var(--muted)}.breadcrumb a{color:var(--muted)}.breadcrumb span{margin-left:8px}main{padding-bottom:68px}h1,h2,h3{color:var(--title);line-height:1.33;letter-spacing:.012em}h1{font-size:clamp(34px,3.25vw,42px);margin:0 0 24px}h2{font-size:clamp(24px,2.2vw,28px);margin:0 0 20px}h3{font-size:19px;margin:24px 0 8px}p{margin:0 0 18px}section{margin-top:56px;min-width:0}section[id]{scroll-margin-top:95px}.lead{font-size:18px;max-width:790px;color:#47616a}.eyebrow{display:block;text-transform:uppercase;color:var(--accent);font-size:12px;font-weight:700;letter-spacing:.15em;margin-bottom:12px}.page-intro{padding:31px 0 10px;border-bottom:1px solid var(--line)}.page-intro p{max-width:790px}.hero{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(0,1fr);align-items:center;gap:38px;padding:32px 0}.hero-copy{min-width:0}.hero a,.primary-text-link{font-weight:700}.inline-links{display:flex;flex-wrap:wrap;gap:12px 26px;margin-top:22px}.image-holder{display:flex;align-items:center;justify-content:center;width:100%;min-width:0;padding:8px;background:var(--light);border-radius:12px;margin:0}.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--rule{--image-limit:210px}.image-holder--banner{--image-limit:190px}.image-holder--portrait{--image-limit:330px;max-width:310px;margin-inline:auto}.image-missing{border-left:3px solid var(--line);background:var(--light);padding:8px 14px;font-size:13px;color:var(--muted);display:inline-block}.route-groups{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.route-pair{border-top:3px solid var(--navy);padding:20px 16px;background:#fff}.route-item+ .route-item{border-top:1px solid var(--line);padding-top:15px;margin-top:15px}.route-item span{font-size:12px;color:var(--accent);font-weight:bold}.route-item h3{margin:4px 0 5px;font-size:18px}.route-item p{font-size:14px;margin:0}.split{display:grid;grid-template-columns:minmax(0,2fr) minmax(0,1fr);gap:38px;align-items:start}.split.equal{grid-template-columns:repeat(2,minmax(0,1fr))}.split.reverse{grid-template-columns:minmax(0,1fr) minmax(0,1.3fr)}.split>*{min-width:0}.note-stack{border-left:1px solid var(--line);padding-left:25px}.note-stack article+article{border-top:1px solid var(--line);padding-top:12px}.feature-band{background:var(--light);padding:28px;border-radius:12px}.dark-band{background:var(--panel);padding:28px;border-radius:12px;color:#e5f0f1}.dark-band h2,.dark-band h3{color:#fff}.prose{max-width:780px}.prose.wide{max-width:1040px}.prose p{line-height:1.85}.article-index{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:14px 0;display:flex;flex-wrap:wrap;gap:12px 25px;margin:26px 0}.article-index a{font-size:14px}.number-steps{counter-reset:steps;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}.number-steps>div{counter-increment:steps;border-top:2px solid var(--accent);padding:13px;background:#fff}.number-steps>div:before{content:'0' counter(steps);font-size:13px;color:var(--accent);font-weight:bold}.number-steps h3{margin:7px 0;font-size:18px}.number-steps p{font-size:14px}.row-steps{display:grid;gap:14px}.row-steps>div{padding:16px 22px;border-left:4px solid var(--accent);background:#fff}.row-steps h3{margin:0 0 5px}.row-steps p{margin:0}.table-scroll{overflow-x:auto;max-width:100%;border:1px solid var(--line);border-radius:10px;background:#fff}.table-scroll table{width:100%;border-collapse:collapse;min-width:560px;text-align:left;font-size:15px}.table-scroll caption{text-align:left;padding:13px 16px;font-weight:700;color:var(--title)}th,td{padding:13px 16px;border-bottom:1px solid var(--line);vertical-align:top}th{background:var(--light);color:var(--title)}tr:last-child td{border-bottom:0}.editor-layout{display:grid;grid-template-columns:205px minmax(0,1fr);gap:38px}.side-index{position:sticky;top:20px;align-self:start;border-top:3px solid var(--accent);padding-top:12px}.side-index a{display:block;padding:9px 0;border-bottom:1px solid var(--line);text-decoration:none}.editor-body section:first-child{margin-top:0}.comparison{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.comparison article{padding:22px;background:#fff;border-top:3px solid var(--accent)}.comparison h3{margin-top:0}.comparison p{font-size:15px}.faq details{border-bottom:1px solid var(--line);background:#fff;padding:0 18px}.faq summary{cursor:pointer;font-weight:700;color:var(--title);padding:15px 0}.faq p{padding:0 0 17px;margin:0}.related{border-top:3px solid var(--navy);margin-top:56px;padding-top:22px}.related h2{font-size:23px}.related-links{display:flex;gap:14px;flex-wrap:wrap}.related-links a{border:1px solid var(--line);background:#fff;padding:9px 14px;border-radius:6px;text-decoration:none}.site-footer{background:var(--footer);color:#c1d4da;padding:42px 0 18px;font-size:14px}.footer-grid{display:grid;grid-template-columns:1fr 1fr;gap:70px}.footer-brand{font-size:20px;color:#fff;font-weight:700}.footer-brand span{font-size:11px;font-weight:400;letter-spacing:.12em}.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 14px;margin-top:12px}.site-footer a{color:#cfe2e6;text-decoration:none}.site-footer strong{color:#fff}.copyright{border-top:1px solid #31505a;margin-top:24px;padding-top:15px;font-size:12px}.statement{font-size:14px;color:var(--muted);border-left:3px solid var(--accent);padding-left:16px}.visual-break{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.05fr);gap:32px;align-items:center}.visual-break>*{min-width:0}.mini-kicker{font-size:13px;font-weight:700;color:var(--accent);letter-spacing:.07em}.rule-note{background:var(--light);padding:18px 22px;border-left:4px solid var(--accent)}.service-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.service-list a{background:#fff;padding:12px 18px;border-bottom:1px solid var(--line);text-decoration:none}.service-list a span{display:block;font-size:13px;color:var(--muted)}.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}@media(max-width:1150px){.header-inner{gap:12px}.brand small{display:none}.desktop-nav{gap:9px}.desktop-nav a{font-size:12px}}@media(max-width:980px){.container,.header-inner{width:calc(100% - 44px)}.header-inner{height:64px;display:grid;grid-template-columns:1fr auto 1fr}.brand{grid-column:2;grid-row:1}.brand img{max-height:30px}.register-link{grid-column:3;grid-row:1;justify-self:end}.desktop-nav{display:none}.mobile-menu{display:block;grid-column:1;grid-row:1;justify-self:start;order:0}.mobile-menu summary{width:44px;height:44px;display:grid;place-items:center;cursor:pointer;list-style:none;font-size:24px;color:#fff}.mobile-menu summary::-webkit-details-marker{display:none}.mobile-menu nav{position:absolute;top:64px;left:0;right:0;padding:18px max(22px,calc((100% - 1220px)/2));background:var(--navy);box-shadow:0 12px 18px #0c26322a;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.mobile-menu nav strong{display:block;color:#8fd6d8;font-size:13px}.mobile-menu nav a{display:block;color:#fff;padding:5px 0;text-decoration:none}.mobile-menu nav a[aria-current=page]{font-weight:700;text-decoration:underline}.hero{gap:22px}.route-groups{gap:12px}}@media(max-width:760px){.split,.split.equal,.split.reverse,.visual-break,.editor-layout,.footer-grid{grid-template-columns:1fr}.side-index{position:static}.comparison{grid-template-columns:1fr}.number-steps{grid-template-columns:repeat(2,minmax(0,1fr))}.route-groups{grid-template-columns:1fr}.route-pair{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px}.route-item+.route-item{border-top:0;border-left:1px solid var(--line);padding:0 0 0 15px;margin:0}.note-stack{border-left:0;padding-left:0}.hero{grid-template-columns:1fr}.hero-copy{order:0}.hero .image-holder{order:1}.mobile-menu nav{grid-template-columns:1fr;gap:10px;max-height:calc(100vh - 64px);overflow-y:auto}.mobile-menu nav>div{border-bottom:1px solid #375765;padding-bottom:8px}.footer-grid{gap:20px}}@media(max-width:640px){body{font-size:15px}.container,.header-inner{width:calc(100% - 32px)}h1{font-size:28px}h2{font-size:22px}.lead{font-size:16px}section{margin-top:35px}.page-intro{padding-top:18px}.hero{padding:20px 0}.feature-band,.dark-band{padding:20px}.image-holder--hero{--image-limit:195px}.image-holder--feature{--image-limit:180px}.image-holder--inline{--image-limit:140px}.image-holder--rule{--image-limit:165px}.image-holder--banner{--image-limit:125px}.image-holder--portrait{--image-limit:275px;max-width:240px}.number-steps{grid-template-columns:1fr}.service-list{grid-template-columns:1fr}.route-pair{display:block}.route-item+.route-item{border-left:0;border-top:1px solid var(--line);padding:15px 0 0;margin-top:15px}.brand-fallback{font-size:17px}.register-link{font-size:12px;padding:5px 8px}.header-inner{gap:5px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation:none!important;transition:none!important}}