:root{--bg:#F6F8F8;--paper:#fff;--soft:#EAF0F2;--navy:#122E3B;--deep:#1A4050;--teal:#168E96;--link:#226D9D;--heading:#193946;--text:#374D58;--muted:#647981;--border:#D9E3E6;--footer:#0C2632;font-family:Arial,'PingFang SC','Microsoft YaHei',sans-serif;color:var(--text);background:var(--bg)}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:95px}body{margin:0;font-size:16.5px;line-height:1.8}a{color:var(--link);text-underline-offset:3px}a:hover{color:var(--teal)}:focus-visible{outline:3px solid #E6B04B;outline-offset:3px}h1,h2,h3{color:var(--heading);line-height:1.35;letter-spacing:.01em}h1{font-size:clamp(34px,3vw,42px);margin:0 0 22px}h2{font-size:27px;margin:0 0 20px}h3{font-size:20px;margin:23px 0 9px}p{margin:0 0 17px}ul,ol{padding-left:1.5em}li+li{margin-top:5px}figure{margin:0}figcaption,.fine{font-size:14px;color:var(--muted)}blockquote{margin:22px 0;padding:14px 22px;background:var(--soft);border-left:4px solid var(--teal)}.skip-link{position:absolute;top:-80px;left:12px;background:#fff;z-index:1000;padding:8px}.skip-link:focus{top:8px}.site-header{background:var(--navy);color:#fff;position:relative;z-index:20}.header-inner{max-width:1220px;margin:auto;min-height:76px;padding:0 28px;display:flex;align-items:center;gap:18px;min-width:0}.brand{display:flex;flex:none;align-items:center;gap:8px;text-decoration:none;color:#fff;min-width:132px}.brand:hover{color:#fff}.brand-label{font-size:10px;line-height:1.2;letter-spacing:.08em;white-space:nowrap}.image-holder{display:flex;align-items:center;justify-content:center;min-width:0;width:100%;padding:8px;background:var(--soft);border-radius:12px}.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--logo{--image-limit:38px;background:transparent;padding:0;width:auto;max-width:125px;border-radius:0}.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--wide{--image-limit:190px}.image-holder--portrait{--image-limit:330px;max-width:310px;margin-inline:auto}.image-note{font-size:13px;color:var(--muted);margin:0;text-align:center}.image-holder--logo .image-note{color:#fff;font-size:11px}.desktop-nav{display:flex;align-items:center;gap:clamp(8px,1vw,18px);flex:1;justify-content:center;min-width:0}.desktop-nav a{white-space:nowrap;color:#eaf3f5;text-decoration:none;font-size:clamp(12px,.92vw,14px);line-height:75px;border-bottom:3px solid transparent}.desktop-nav a:hover,.desktop-nav .is-current{color:#fff;border-bottom-color:#59c5ca;font-weight:700}.entry-link{border:1px solid #65b2b9;padding:7px 11px;border-radius:7px;color:#fff;white-space:nowrap;text-decoration:none;font-size:14px}.entry-link:hover{color:#fff;background:var(--deep)}.mobile-menu{display:none}.breadcrumb-wrap{background:#edf3f4;border-bottom:1px solid var(--border)}.breadcrumb{max-width:1220px;margin:auto;padding:8px 28px;display:flex;gap:12px;font-size:13px}.breadcrumb a{color:var(--link)}main{max-width:1220px;padding:34px 28px 80px;margin:auto;min-height:55vh}section{margin-top:58px;scroll-margin-top:90px}.page-intro{max-width:830px;margin-bottom:30px}.lede{font-size:18px;line-height:1.78;color:#2e5260}.eyebrow{font-weight:700;letter-spacing:.14em;color:var(--teal);font-size:13px;margin-bottom:10px}.hero-grid{display:grid;grid-template-columns:minmax(0,1.38fr) minmax(0,1fr);align-items:center;gap:34px;padding:20px 0}.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}.text-action{display:inline-block;padding:7px 14px;border:1px solid var(--border);border-radius:7px;text-decoration:none;font-weight:700}.text-action.primary{background:var(--deep);color:#fff;border-color:var(--deep)}.section-heading{display:flex;justify-content:space-between;gap:14px;align-items:baseline;border-bottom:1px solid var(--border);padding-bottom:9px;margin-bottom:22px}.section-heading h2{margin:0}.topic-group{display:grid;grid-template-columns:120px minmax(0,1fr) minmax(0,1fr);gap:24px;padding:20px 0;border-bottom:1px solid var(--border)}.topic-group>strong{font-size:15px;color:var(--teal)}.topic-group article h3{margin:0 0 6px;font-size:19px}.topic-group article p{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(0,1.55fr)}.article-body{max-width:780px}.article-body p{line-height:1.82}.subtle-panel{padding:20px 23px;background:var(--soft);border-radius:10px}.subtle-panel h3:first-child{margin-top:0}.numbered{counter-reset:step;list-style:none;padding:0}.numbered li{position:relative;padding:0 0 22px 50px;counter-increment:step;border-left:1px solid var(--border);margin-left:16px}.numbered li:before{content:counter(step,decimal-leading-zero);position:absolute;left:-17px;top:0;border:1px solid var(--teal);color:var(--teal);background:#fff;border-radius:50%;width:34px;height:34px;display:grid;place-items:center;font-size:12px;font-weight:700}.numbered li:last-child{border-left-color:transparent}.route-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px}.route-grid>div{border-top:3px solid var(--teal);padding-top:12px}.route-grid strong{display:block;color:var(--heading)}.section-index{padding:14px 18px;background:var(--soft);border-radius:10px}.section-index ul{list-style:none;margin:9px 0 0;padding:0;display:flex;flex-wrap:wrap;gap:10px 23px}.section-index li{margin:0}.section-index strong{color:var(--heading)}.reading-layout{display:grid;grid-template-columns:205px minmax(0,1fr);gap:38px;align-items:start}.reading-layout .section-index{position:sticky;top:15px}.reading-layout .section-index ul{display:block}.reading-layout .section-index li{margin:8px 0}.reading-layout section:first-child{margin-top:0}.full-span{grid-column:1/-1}.table-scroll{max-width:100%;overflow-x:auto;border:1px solid var(--border);border-radius:10px;margin:22px 0;background:#fff}table{width:100%;border-collapse:collapse;min-width:600px;font-size:15px}caption{text-align:left;padding:13px 16px;font-weight:700;color:var(--heading)}th,td{padding:12px 15px;border-bottom:1px solid var(--border);text-align:left;vertical-align:top}th{background:var(--soft);color:var(--heading)}tr:last-child td{border-bottom:0}.compare-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:17px}.compare-grid article{border-top:4px solid var(--teal);background:#fff;padding:16px 20px}.compare-grid h3{margin-top:0}.band{padding:24px 28px;border-left:4px solid var(--teal);background:#fff;margin-top:22px}.band.dark{background:var(--deep);color:#edf6f8}.band.dark h2,.band.dark h3{color:#fff}.related{background:var(--soft);padding:21px 26px;border-radius:10px;margin-top:54px}.related h2{font-size:22px;margin:0 0 8px}.related ul{display:flex;flex-wrap:wrap;gap:8px 26px;margin:0}.faq details{border-bottom:1px solid var(--border);padding:12px 0}.faq summary{cursor:pointer;font-weight:700;color:var(--heading);padding:5px 3px}.faq details p{margin:12px 18px}.service-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:25px}.service-grid>div{padding:18px 22px;background:#fff;border:1px solid var(--border);border-radius:9px}.service-grid h3{margin-top:0}.site-footer{background:var(--footer);color:#d5e5e9}.footer-inner{max-width:1220px;margin:auto;padding:37px 28px 22px;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.4fr);gap:30px}.footer-brand{color:white;font-size:22px;font-weight:700;text-decoration:none}.footer-brand small{font-size:11px;font-weight:400;letter-spacing:.12em}.footer-intro p{font-size:13px;margin-top:10px}.footer-links{display:flex;gap:8px 20px;flex-wrap:wrap;margin-top:10px}.footer-links a{color:#cce8ed;font-size:14px}.footer-bottom{grid-column:1/-1;margin:0;border-top:1px solid #31515f;padding-top:15px;font-size:13px;color:#b1c7ce}section>h2{margin-bottom:16px}@media(max-width:1100px){.header-inner{gap:10px;padding:0 22px}.brand{min-width:104px}.brand-label{font-size:9px}.desktop-nav{gap:8px}.desktop-nav a{font-size:12px}.entry-link{font-size:12px;padding:6px}}@media(max-width:980px){.header-inner{height:64px;min-height:64px;justify-content:space-between}.desktop-nav{display:none}.mobile-menu{display:block;position:static;order:0}.brand{order:1;min-width:0}.entry-link{order:2;font-size:13px;padding:7px 9px}.mobile-menu summary{list-style:none;cursor:pointer;color:white;width:44px;height:44px;display:grid;place-items:center;font-size:25px}.mobile-menu summary::-webkit-details-marker{display:none}.mobile-nav{position:absolute;top:64px;left:0;right:0;background:var(--navy);padding:18px max(22px,calc((100vw - 1100px)/2));box-shadow:0 12px 18px #122e3b20;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}.mobile-nav>div{min-width:0}.mobile-nav strong{display:block;color:#77c4cb;margin-bottom:10px}.mobile-nav a{display:block;padding:5px 0;color:#fff;text-decoration:none}.mobile-nav .is-current{font-weight:700;text-decoration:underline}.menu-close{background:transparent;color:#fff;border:1px solid #70a5ae;border-radius:5px;padding:8px 14px;margin-top:11px;cursor:pointer}.image-holder--logo{--image-limit:30px}.breadcrumb,main{padding-left:22px;padding-right:22px}}@media(max-width:760px){.split,.split.equal,.split.reverse,.hero-grid,.reading-layout,.service-grid{grid-template-columns:minmax(0,1fr)}.reading-layout .section-index{position:static}.reading-layout .section-index ul{display:flex}.route-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.compare-grid{grid-template-columns:1fr}.hero-grid{gap:16px}.topic-group{grid-template-columns:1fr 1fr}.topic-group>strong{grid-column:1/-1}.footer-inner{grid-template-columns:1fr}.footer-bottom{grid-column:auto}.mobile-nav{grid-template-columns:1fr 1fr;gap:12px}.section-heading{display:block}}@media(max-width:640px){body{font-size:15.5px}main{padding:27px 16px 55px}.breadcrumb{padding-left:16px;padding-right:16px}.header-inner{padding:0 16px}h1{font-size:28px}h2{font-size:22px}h3{font-size:18px}.lede{font-size:16px}section{margin-top:36px}.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--wide{--image-limit:125px}.image-holder--portrait{--image-limit:275px;max-width:240px}.topic-group{grid-template-columns:1fr;gap:12px}.topic-group>strong{grid-column:auto}.route-grid{grid-template-columns:1fr 1fr;gap:16px}.subtle-panel,.band{padding:16px}.mobile-nav{grid-template-columns:1fr;max-height:calc(100dvh - 64px);overflow-y:auto;padding:16px}.mobile-nav>div{border-bottom:1px solid #345461;padding-bottom:10px}.footer-inner{padding:30px 16px}.brand-label{font-size:9px}}@media(max-width:380px){.brand-label{display:none}.route-grid{grid-template-columns:1fr}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation-duration:.01ms!important;transition-duration:.01ms!important}}.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}
