:root{--bg:#F6F8F8;--paper:#fff;--mist:#EAF0F2;--navy:#122E3B;--deep:#1A4050;--teal:#168E96;--link:#226D9D;--heading:#193946;--text:#374D58;--muted:#647981;--line:#D9E3E6;--footer:#0C2632}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:95px}body{margin:0;font-family:Arial,'PingFang SC','Microsoft YaHei',sans-serif;font-size:16.5px;line-height:1.82;color:var(--text);background:var(--bg)}a{color:var(--link);text-underline-offset:3px}a:hover{color:var(--teal)}a:focus-visible,summary:focus-visible{outline:3px solid #42b9c0;outline-offset:3px}h1,h2,h3{color:var(--heading);line-height:1.34;margin:0 0 .7em}h1{font-size:clamp(34px,3.3vw,42px);letter-spacing:-.025em}h2{font-size:clamp(24px,2.2vw,28px)}h3{font-size:20px}p{margin:.3em 0 1.18em}ul,ol{padding-left:1.4em}li+li{margin-top:.35em}section{margin:0 0 56px}section[id]{scroll-margin-top:100px}.site-header{position:relative;background:var(--navy);color:#fff;z-index:5}.header-inner{max-width:1220px;margin:auto;min-height:76px;padding:0 28px;display:flex;align-items:center;gap:24px}.brand{display:flex;align-items:center;gap:9px;flex-shrink:0;color:#fff;text-decoration:none}.brand img{display:block;max-width:155px;max-height:38px;width:auto;height:auto;object-fit:contain}.brand-text{font-weight:750;white-space:nowrap;font-size:20px}.brand-en{font-size:10px;letter-spacing:.1em;line-height:1.4;max-width:72px}.desktop-nav{display:flex;align-items:center;justify-content:center;flex:1;min-width:0;gap:clamp(7px,1vw,17px)}.desktop-nav a{white-space:nowrap;text-decoration:none;font-size:13px;color:#dce9ec;padding:9px 0;border-bottom:2px solid transparent}.desktop-nav a[aria-current="page"]{border-color:#65d4d4;font-weight:700;color:white}.desktop-nav a:hover{color:white}.entry-link{white-space:nowrap;color:#fff;text-decoration:none;border:1px solid #80afb9;padding:5px 12px;border-radius:7px;font-size:13px}.entry-link:hover{background:#245265;color:#fff}.mobile-menu{display:none}.breadcrumb-wrap{background:#eef3f4;border-bottom:1px solid var(--line)}.breadcrumb{max-width:1220px;margin:auto;padding:7px 28px;display:flex;gap:10px;align-items:center;font-size:13px;color:var(--muted)}.breadcrumb a{color:var(--muted)}.page-shell{max-width:1220px;padding:36px 28px 70px;margin:0 auto;min-height:55vh}.eyebrow{text-transform:uppercase;color:var(--teal);font-weight:700;letter-spacing:.14em;font-size:12px;margin-bottom:12px}.lead{font-size:18px;line-height:1.78;color:#405c68;max-width:780px}.page-intro{margin:0 0 45px;border-bottom:1px solid var(--line);padding-bottom:26px}.article{max-width:780px}.paper{background:var(--paper);padding:26px;border:1px solid var(--line);border-radius:12px}.soft{background:var(--mist);padding:24px;border-radius:12px}.deep-panel{background:var(--deep);color:#f3fbfc;padding:28px;border-radius:10px}.deep-panel h2,.deep-panel h3{color:white}.deep-panel a{color:#b1f1f3}.split{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(0,1fr);gap:32px;align-items:start}.split--wide{grid-template-columns:minmax(0,2fr) minmax(0,1fr)}.split--reverse{grid-template-columns:minmax(0,1fr) minmax(0,1.4fr)}.cols3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.cols2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.image-holder{display:flex;align-items:center;justify-content:center;width:100%;min-width:0;padding:8px;background:var(--mist);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--banner{--image-limit:190px}.image-holder--rules{--image-limit:210px}.image-holder--portrait{--image-limit:330px;max-width:310px;margin-inline:auto}.image-holder--logo{--image-limit:38px}.image-unavailable{margin:0;background:var(--mist);border-left:3px solid var(--line);padding:10px 14px;font-size:13px;color:var(--muted)}.section-links{display:flex;gap:9px;flex-wrap:wrap;margin:15px 0 35px}.section-links a{padding:5px 12px;border:1px solid var(--line);background:#fff;border-radius:30px;text-decoration:none;font-size:14px}.topic-groups{border-top:1px solid var(--line)}.topic-group{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));border-bottom:1px solid var(--line);gap:30px;padding:23px 0}.topic-line{display:flex;gap:15px}.topic-line .num{color:var(--teal);font-size:21px;font-weight:700}.topic-line h3{font-size:19px;margin:0}.topic-line p{font-size:15px;margin:4px 0}.reading-steps{counter-reset:step;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:15px}.reading-steps>div{border-top:3px solid var(--teal);background:white;padding:20px;counter-increment:step}.reading-steps>div:before{content:'0' counter(step);color:var(--teal);font-size:13px;font-weight:bold}.reading-steps h3{margin:8px 0}.outline-layout{display:grid;grid-template-columns:215px minmax(0,1fr);gap:34px}.outline-layout .aside-index{align-self:start;position:sticky;top:14px;background:var(--mist);padding:20px;border-radius:10px}.aside-index a{display:block;margin:7px 0}.article section{margin-bottom:45px}.article p{max-width:76ch}.comparison{overflow-x:auto;max-width:100%;border:1px solid var(--line);border-radius:8px;margin:16px 0 28px;background:#fff}.comparison table{width:100%;border-collapse:collapse;min-width:550px;text-align:left}.comparison caption{text-align:left;font-weight:bold;color:var(--heading);padding:12px 14px}.comparison th,.comparison td{padding:12px 15px;border-bottom:1px solid var(--line);vertical-align:top}.comparison th{background:var(--mist);color:var(--heading)}.comparison tr:last-child td{border-bottom:0}.note{border-left:3px solid var(--teal);padding:10px 17px;margin:18px 0;background:var(--mist);font-size:15px}.numbered-list{list-style:none;margin:0;padding:0;counter-reset:st}.numbered-list li{counter-increment:st;padding:15px 0 16px 48px;border-bottom:1px solid var(--line);position:relative}.numbered-list li:before{content:counter(st,decimal-leading-zero);position:absolute;left:0;top:15px;color:var(--teal);font-weight:bold}.feature-line{padding:28px 0;border-top:1px solid var(--line)}.faq details{border-bottom:1px solid var(--line);background:#fff}.faq summary{cursor:pointer;padding:15px 18px;font-weight:700;color:var(--heading)}.faq details p{margin:0;padding:0 18px 17px}.related{border-top:2px solid var(--navy);padding-top:22px;margin-top:44px}.related-links{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.related-links a{display:flex;flex-direction:column;border:1px solid var(--line);border-radius:8px;background:#fff;padding:16px;text-decoration:none}.related-links span{font-size:13px;color:var(--muted)}.site-footer{background:var(--footer);color:#d0dfe5}.footer-inner{max-width:1220px;padding:42px 28px;margin:auto;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.35fr);gap:50px}.footer-brand{font-size:22px;font-weight:bold;color:#fff;text-decoration:none}.footer-brand small{font-size:11px;margin-left:10px;letter-spacing:.1em}.footer-inner p{font-size:14px;max-width:480px;margin-top:12px}.footer-inner nav{display:flex;gap:8px 22px;flex-wrap:wrap;align-content:start}.footer-inner nav a{color:#d0dfe5;text-decoration:none;font-size:14px}.footer-bottom{border-top:1px solid #31505d;text-align:center;padding:14px;font-size:12px;color:#afc5cf}.skip-link{position:absolute;left:-10000px;top:0;z-index:100}.skip-link:focus{left:10px;top:10px;background:white;padding:8px}.gallery-entry{padding:22px 0;border-top:1px solid var(--line)}.mini-label{font-size:12px;color:var(--teal);font-weight:700;letter-spacing:.09em}.stateless-graphic{display:flex;gap:5px;align-items:stretch;margin:20px 0}.stateless-graphic span{flex:1;background:var(--mist);border-top:4px solid var(--teal);padding:16px 12px;font-size:14px}.stateless-graphic strong{display:block;color:var(--heading)}@media(max-width:1190px){.header-inner{gap:12px}.brand img{max-width:120px}.brand-en{display:none}.desktop-nav{gap:9px}.desktop-nav a{font-size:12px}.entry-link{padding:5px 8px}}@media(max-width:980px){.header-inner{min-height:64px;justify-content:space-between;padding:0 22px;gap:12px}.desktop-nav{display:none}.mobile-menu{display:block;order:0;flex:1;min-width:0}.mobile-menu summary{display:inline-flex;align-items:center;gap:6px;list-style:none;cursor:pointer;min-height:42px;min-width:42px;color:white;font-size:13px}.mobile-menu summary::-webkit-details-marker{display:none}.hamburger{font-size:21px}.brand{order:1;flex:none;justify-content:center}.brand img{max-width:150px;max-height:30px}.brand-text{font-size:17px}.brand-en{display:none}.entry-link{order:2;flex:1;text-align:right;border:0;padding:6px 0}.mobile-menu-panel{position:absolute;left:0;right:0;top:100%;background:var(--navy);padding:18px 22px 25px;border-top:1px solid #31525b;box-shadow:0 12px 22px #0a29323d;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.mobile-menu-group strong{display:block;color:#7ed1d6;font-size:13px}.mobile-menu-group a{display:block;color:#fff;text-decoration:none;padding:6px 0;font-size:15px}.mobile-menu-group a[aria-current="page"]{text-decoration:underline;text-decoration-thickness:2px}.breadcrumb{padding:6px 22px}.page-shell{padding:28px 22px 60px}}@media(max-width:760px){.split,.split--wide,.split--reverse,.outline-layout,.cols3,.cols2,.footer-inner{grid-template-columns:minmax(0,1fr)}.outline-layout{gap:20px}.outline-layout .aside-index{position:static}.reading-steps{grid-template-columns:repeat(2,minmax(0,1fr))}.related-links{grid-template-columns:1fr}.footer-inner{gap:20px}.page-shell{padding-top:24px}}@media(max-width:640px){body{font-size:15.5px}.header-inner{padding:0 16px}.menu-label{display:none}.mobile-menu-panel{grid-template-columns:1fr;gap:12px;max-height:80vh;overflow:auto;padding:15px 22px}.mobile-menu-group{border-bottom:1px solid #375663;padding-bottom:8px}.mobile-menu-group a{padding:4px 0}.breadcrumb{padding:6px 16px}.page-shell{padding:22px 16px 45px}h1{font-size:28px}h2{font-size:22px}h3{font-size:18px}.lead{font-size:16.5px}section{margin-bottom:34px}.paper,.soft,.deep-panel{padding:18px}.split{gap:18px}.topic-group{grid-template-columns:1fr;gap:18px}.reading-steps{gap:8px}.reading-steps>div{padding:12px}.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}.stateless-graphic{flex-direction:column}.footer-inner{padding:30px 16px}.footer-bottom{padding:14px 16px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}
