:root{--bg:#F6F8F8;--paper:#fff;--surface:#EAF0F2;--nav:#122E3B;--panel:#1A4050;--accent:#168E96;--link:#226D9D;--heading:#193946;--ink:#374D58;--muted:#647981;--line:#D9E3E6;--footer:#0C2632}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.8 Arial,"PingFang SC","Microsoft YaHei",sans-serif}a{color:var(--link);text-underline-offset:4px}a:hover{color:#11516d}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid #2c9cac;outline-offset:3px}h1,h2,h3{color:var(--heading);line-height:1.35;letter-spacing:.01em}h1{font-size:clamp(28px,3vw,42px);margin:0 0 20px}h2{font-size:clamp(21px,2.2vw,28px);margin:0 0 16px}h3{font-size:19px;margin:20px 0 8px}p{margin:0 0 16px}ul,ol{padding-left:1.5em}li+li{margin-top:8px}.container{max-width:1220px;margin-inline:auto;padding-inline:28px}.skip-link{position:absolute;left:10px;top:-60px;background:white;padding:5px 14px;z-index:40}.skip-link:focus{top:10px}.site-header{position:relative;z-index:20;background:var(--nav);color:white}.header-inner{max-width:1220px;margin:auto;padding:0 28px;min-height:76px;display:flex;align-items:center;gap:16px}.brand{color:white;text-decoration:none;display:flex;align-items:center;gap:8px;flex-shrink:0;min-width:0}.brand:hover{color:white}.brand-name{font-size:10px;font-weight:700;letter-spacing:.09em;white-space:nowrap}.brand-media .image-holder{padding:0;background:none;border-radius:0;max-width:125px}.brand-media img{max-height:38px;max-width:125px}.brand-media .media-missing{font-size:11px;max-width:96px;background:transparent;color:white;padding:0}.desktop-nav{display:flex;align-items:center;justify-content:center;gap:clamp(7px,1.2vw,18px);flex:1;min-width:0}.desktop-nav a{font-size:clamp(11px,.9vw,14px);white-space:nowrap;color:#e3eef0;text-decoration:none;border-bottom:2px solid transparent;padding:8px 0}.desktop-nav a:hover,.desktop-nav a[aria-current]{color:white;border-bottom-color:#56b7bd}.desktop-nav a[aria-current]{font-weight:700}.register-link{white-space:nowrap;text-decoration:none;background:var(--accent);color:#fff;border-radius:8px;padding:7px 13px;font-size:13px;font-weight:700}.register-link:hover{color:white;background:#12757d}.menu-toggle,.mobile-nav{display:none}.nojs-nav{display:none}.breadcrumb{padding-top:16px;padding-bottom:12px;color:var(--muted);font-size:13px}.breadcrumb span{margin:0 7px}main.container{padding-bottom:74px}.eyebrow{font-size:12px;text-transform:uppercase;letter-spacing:.12em;color:var(--accent);font-weight:700}.lead{font-size:18px;max-width:770px;color:#465d67}.hero,.feature-grid,.split,.editorial-grid,.two-col,.guide-layout,.gallery-piece,.title-with-image{display:grid;gap:32px;align-items:start}.hero{grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);padding-top:40px;align-items:center}.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin:20px 0}.text-button{display:inline-block;padding:9px 18px;text-decoration:none;border:1px solid var(--accent);border-radius:7px;font-weight:700}.text-button.primary{background:var(--accent);color:white}.text-button:hover{background:#e3f5f4}.text-button.primary:hover{background:#146f77}.section{margin-top:56px}.section-kicker{font-size:13px;color:var(--accent);font-weight:700;margin-bottom:8px}.section-intro{max-width:790px}.feature-grid{grid-template-columns:2fr 1fr}.split{grid-template-columns:1fr 1fr;align-items:center}.editorial-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.route-group{border-top:2px solid var(--line);padding-top:15px}.route-item{padding:10px 0 18px;border-bottom:1px solid var(--line)}.route-number{color:var(--accent);font-size:12px;font-weight:700}.route-item h3{margin:3px 0 4px}.route-item p{font-size:14px;margin:0}.paper,.note-panel,.dark-panel{padding:25px;background:var(--paper);border:1px solid var(--line);border-radius:10px}.note-panel{background:var(--surface)}.dark-panel{background:var(--panel);border:0;color:#e2eff0}.dark-panel h2,.dark-panel h3{color:#fff}.dark-panel a{color:#9ee7e3}.article-intro{padding:32px 0 18px;border-bottom:1px solid var(--line)}.article-intro p{max-width:800px}.article{max-width:790px}.article-wide{max-width:1040px}.article-section{margin:38px 0 0}.article-section p{max-width:790px}.reading-index{padding:19px 22px;margin:28px 0;background:var(--surface);border-left:3px solid var(--accent)}.reading-index strong{display:block;margin-bottom:8px}.reading-index a{display:inline-block;margin-right:20px;margin-bottom:4px}.side-index{position:sticky;top:18px;border-left:2px solid var(--line);padding:14px 18px}.side-index a{display:block;padding:5px 0}.guide-layout{grid-template-columns:205px minmax(0,1fr);gap:36px}.guide-layout>*{min-width:0}.number-steps{counter-reset:step;list-style:none;padding:0}.number-steps li{position:relative;padding:14px 12px 15px 56px;border-bottom:1px solid var(--line)}.number-steps li:before{counter-increment:step;content:counter(step,decimal-leading-zero);position:absolute;left:0;top:14px;color:var(--accent);font-weight:700}.quote{font-size:20px;border-left:4px solid var(--accent);padding:10px 18px;margin:24px 0;background:var(--surface)}.related{margin-top:56px;padding-top:22px;border-top:2px solid var(--line)}.related ul{display:flex;flex-wrap:wrap;gap:10px 30px;list-style:none;padding:0}.related li{margin:0}.table-scroll{max-width:100%;overflow-x:auto;overscroll-behavior-inline:contain;margin:22px 0;border:1px solid var(--line);border-radius:8px}.knowledge-table{border-collapse:collapse;width:100%;min-width:550px;background:#fff;font-size:15px}.knowledge-table caption{text-align:left;padding:12px 15px;color:var(--heading);font-weight:700;background:var(--surface)}.knowledge-table th,.knowledge-table td{border-bottom:1px solid var(--line);padding:12px 15px;text-align:left;vertical-align:top}.knowledge-table th{background:#ecf4f4;color:var(--heading)}.knowledge-table tr:last-child td{border-bottom:0}.image-holder{display:flex;justify-content:center;align-items:center;max-width:100%;min-width:0;margin:0;padding:8px;background:var(--surface);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--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;margin-inline:auto}.image-holder--logo{--image-limit:38px}.media-missing{padding:12px 16px;border:1px dashed #9bb6bf;border-radius:8px;font-size:13px;color:var(--muted);background:var(--surface)}.portrait-column{max-width:320px}.gallery-piece{grid-template-columns:minmax(0,1fr) minmax(0,1.2fr);align-items:center}.gallery-piece.reverse{grid-template-columns:minmax(0,1.2fr) minmax(0,1fr)}.wide-line{padding:20px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}details.faq{border-bottom:1px solid var(--line);padding:13px 0}details.faq summary{cursor:pointer;font-weight:700;color:var(--heading)}details.faq p{padding:9px 0 0;margin-bottom:3px}.two-col{grid-template-columns:1fr 1fr}.site-footer{background:var(--footer);color:#c9d9df;padding:44px 0}.footer-grid{display:grid;grid-template-columns:1.25fr 1fr;gap:55px}.footer-brand{font-size:22px;font-weight:700;color:#fff;text-decoration:none}.footer-brand span{font-size:11px;letter-spacing:.1em}.footer-boundary{font-size:13px;color:#9bb4be}.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:5px 16px;margin-top:12px}.footer-links a{color:#e2eff0;font-size:14px}.label-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px}.label-list a{display:block;padding:15px 18px;border-left:3px solid var(--accent);background:white;text-decoration:none}.muted{color:var(--muted)}.mini-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}.mini-grid>div{border-top:3px solid var(--accent);padding-top:12px}.intro-band{background:var(--surface);padding:28px;border-radius:10px;margin-top:24px}
@media(max-width:1100px){.header-inner{gap:10px;padding-inline:22px}.brand-name{display:none}.desktop-nav{gap:9px}.desktop-nav a{font-size:12px}}
@media(max-width:980px){.container{padding-inline:22px}.header-inner{min-height:64px;justify-content:space-between}.desktop-nav{display:none}.menu-toggle{display:inline-flex;align-items:center;justify-content:center;background:none;border:1px solid #70909a;color:white;border-radius:7px;width:42px;height:42px;font-size:23px;cursor:pointer}.brand-name{display:inline;font-size:10px}.brand-media img{max-height:30px}.mobile-nav:not([hidden]){display:block;background:#fff;color:var(--heading);position:absolute;top:100%;left:0;right:0;box-shadow:0 8px 16px #102a3522;padding:18px 22px}.mobile-nav-top{display:flex;justify-content:space-between;align-items:center}.menu-close{background:var(--surface);border:1px solid var(--line);border-radius:6px;padding:8px 12px;cursor:pointer}.mobile-groups{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.mobile-groups h2{font-size:15px;margin:12px 0 8px}.mobile-groups a{display:block;padding:5px 0;font-size:14px}.nojs-nav{display:block;padding:0 22px 9px;color:white}.nojs-nav summary{cursor:pointer}.nojs-nav a{display:inline-block;color:white;margin:5px 15px 5px 0}.hero{gap:20px}}
@media(max-width:760px){.hero,.feature-grid,.split,.two-col,.gallery-piece,.gallery-piece.reverse,.guide-layout,.footer-grid,.title-with-image{grid-template-columns:1fr}.editorial-grid,.mini-grid{grid-template-columns:1fr 1fr}.side-index{position:static;display:flex;gap:14px;flex-wrap:wrap;border-left:0;border-bottom:1px solid var(--line)}.guide-layout{gap:12px}.section{margin-top:38px}.article-intro{padding-top:22px}.gallery-piece.reverse .image-holder{order:0}.footer-grid{gap:26px}}
@media(max-width:640px){body{font-size:15px;line-height:1.78}.container{padding-inline:16px}.header-inner{padding-inline:16px;gap:8px}.brand-name{font-size:9px}.register-link{font-size:12px;padding:6px 9px}.brand-media .image-holder{max-width:100px}.brand-media img{max-width:100px}.hero{padding-top:26px}.hero-actions{gap:7px}.text-button{font-size:13px}.section{margin-top:32px}h1{font-size:28px}h2{font-size:22px}.lead{font-size:16px}.editorial-grid,.mini-grid,.label-list{grid-template-columns:1fr}.paper,.note-panel,.dark-panel{padding:18px}.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}.mobile-groups{grid-template-columns:1fr 1fr;gap:10px}.reading-index a{margin-right:12px}.related ul{display:block}.related li{margin:7px 0}.footer-links{grid-template-columns:1fr 1fr}}
@media(max-width:390px){.brand-name{display:none}.mobile-groups{grid-template-columns:1fr 1fr}.register-link{padding:6px 8px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation-duration:.01ms!important;transition-duration:.01ms!important}}
