:root{--bg:#F6FAFC;--white:#fff;--mist:#EAF6FA;--soft:#EDF4F8;--cyan:#25C8D1;--sky:#25B6E8;--blue:#1787DB;--navy:#174B78;--ink:#183A56;--text:#31485D;--muted:#687D8E;--line:#DCE9F0;--footer:#123653;--radius:18px}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:var(--bg);color:var(--text);font-family:Arial,'PingFang SC','Microsoft YaHei',sans-serif;font-size:16px;line-height:1.8;overflow-wrap:break-word}a{color:var(--navy);text-underline-offset:4px}a:hover{color:#086a9c}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid #25B6E8;outline-offset:3px}button{font:inherit;cursor:pointer}.wrap{width:min(100% - 56px,1180px);margin-inline:auto}.skip-link{position:absolute;top:-80px;left:12px;z-index:1000;background:white;padding:8px 12px}.skip-link:focus{top:8px}.site-header{background:#fff;border-bottom:1px solid var(--line)}.header-top{height:72px;display:flex;align-items:center;gap:24px}.brand{display:flex;align-items:center;text-decoration:none;min-width:185px}.brand .media{width:auto;max-width:210px;height:38px;background:transparent;border-radius:0}.brand .media img{max-height:38px}.brand-fallback{display:none;font-size:18px;letter-spacing:.08em;color:var(--ink);font-weight:800}.brand .media:has(.media-placeholder){display:none}.brand .media:has(.media-placeholder)+.brand-fallback{display:inline}.header-tagline{margin:auto;color:var(--muted);font-size:14px;letter-spacing:.1em}.header-cta{flex:none;background:var(--navy);color:white;text-decoration:none;padding:8px 22px;border-radius:9px;font-size:14px;font-weight:700;line-height:1.8;min-height:42px;display:flex;align-items:center}.header-cta:hover{background:#086a9c;color:white}.desktop-nav{background:var(--navy)}.nav-links{height:48px;display:flex;align-items:stretch;justify-content:space-between;gap:8px}.nav-links a{display:flex;align-items:center;text-decoration:none;color:#effcff;font-size:14px;white-space:nowrap;border-bottom:3px solid transparent;padding:3px 13px 0}.nav-links a[aria-current=page]{font-weight:700;border-color:#73e2eb;color:white}.nav-links a:hover{background:#225c88;color:white}.menu-toggle{display:none}.drawer-backdrop,.mobile-drawer,.mobile-bottom{display:none}.page-header{padding:58px 0 28px}.eyebrow{text-transform:uppercase;letter-spacing:.16em;color:#1288a5;font-size:12px;font-weight:800;margin:0 0 12px}.page-header h1,.hero h1{font-size:clamp(32px,3vw,42px);line-height:1.35;color:var(--ink);margin:0 0 18px;letter-spacing:-.03em}.page-header .lead{max-width:780px;font-size:17px;margin:0;color:#466176}.hero{display:grid;grid-template-columns:minmax(0,56fr) minmax(0,44fr);gap:36px;align-items:center;padding-top:54px;padding-bottom:56px}.hero-copy{min-width:0}.hero h1{font-size:clamp(35px,3.45vw,42px);max-width:660px}.hero p{max-width:610px;margin:0 0 14px;font-size:17px}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:27px}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:9px 18px;border-radius:9px;text-decoration:none;font-size:14px;font-weight:700;background:var(--navy);color:#fff}.btn:hover{background:#076a9c;color:white}.btn--light{background:white;color:var(--navy);border:1px solid #cbdfe9}.btn--light:hover{background:var(--mist);color:var(--navy)}.media{display:flex;align-items:center;justify-content:center;width:100%;min-width:0;overflow:hidden;border-radius:14px;background:var(--mist)}.media img{display:block;width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain;object-position:center}.media-placeholder{width:50%;height:30%;border:1px solid #c2dbe6;border-radius:12px;background:linear-gradient(145deg,#eaf6fa,#dceef5)}.media--hero{height:clamp(250px,26vw,330px)}.media--feature{height:250px}.media--card{height:170px}.media--banner{height:220px}.media--mobile{height:350px;max-width:320px}.media--logo{height:38px}.media.portrait{max-width:360px;margin-inline:auto}.media.panorama{height:auto;min-height:115px;max-height:240px;aspect-ratio:2.2}.media.panorama img{max-height:235px}.section{padding:48px 0}.section--tinted{background:var(--mist)}.section--white{background:#fff}.section-head{margin-bottom:25px;display:flex;align-items:end;justify-content:space-between;gap:20px}.section h2,.related h2{font-size:clamp(23px,2.1vw,27px);line-height:1.4;color:var(--ink);margin:0 0 14px}.section-head h2{margin:0}.section-head p{max-width:600px;margin:7px 0 0;color:var(--muted)}.text-link{font-size:14px;font-weight:700;white-space:nowrap}.quick-topics{background:white;border-bottom:1px solid var(--line)}.quick-topics-inner{display:flex;gap:25px;flex-wrap:wrap;padding:13px 0}.quick-topics .quick-group{display:flex;gap:11px;align-items:baseline;font-size:13px}.quick-group strong{color:var(--ink)}.quick-group a{color:var(--muted);text-decoration:none;border-bottom:1px solid #b6d1df}.topic-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.topic-card{display:flex;flex-direction:column;gap:9px;padding:22px;border:1px solid var(--line);border-radius:14px;background:#fff;text-decoration:none;color:var(--text);min-height:174px;transition:border-color .15s,transform .15s}.topic-card:hover{border-color:var(--sky);transform:translateY(-2px);color:var(--text)}.topic-card strong{font-size:18px;color:var(--ink);line-height:1.4}.topic-card span{font-size:14px;line-height:1.7;color:var(--muted)}.topic-card em{font-style:normal;color:var(--blue);margin-top:auto;font-size:13px;font-weight:700}.editorial-grid{display:grid;grid-template-columns:2fr 1fr;gap:18px}.feature-panel,.small-panel,.surface{background:white;border:1px solid var(--line);border-radius:var(--radius);padding:27px}.feature-panel h3,.small-panel h3,.surface h3{color:var(--ink);line-height:1.45;margin:10px 0 10px;font-size:21px}.feature-panel p,.small-panel p{margin:0 0 12px}.aside-stack{display:grid;gap:18px}.aside-stack .small-panel h3{font-size:18px;margin:4px 0 8px}.split{display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:38px}.split--wide{grid-template-columns:1.12fr .88fr}.split>*,.editorial-grid>*,.topic-grid>*{min-width:0}.overline{font-size:12px;font-weight:800;color:#1485a9;letter-spacing:.13em;text-transform:uppercase}.split h2{margin:8px 0 14px}.split p{margin:0 0 14px}.mini-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}.mini-card{border-left:3px solid #25C8D1;background:white;padding:18px 21px;border-radius:0 10px 10px 0}.mini-card h3{margin:0 0 8px;color:var(--ink);font-size:18px}.mini-card p{margin:0;font-size:14px}.steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;counter-reset:steps}.step{padding:20px;background:white;border:1px solid var(--line);border-radius:13px}.step:before{counter-increment:steps;content:'0' counter(steps);display:block;color:#0c9cbb;font-size:19px;font-weight:bold;margin-bottom:13px}.step strong{display:block;color:var(--ink)}.step p{font-size:14px;margin:5px 0 0}.article-layout{display:grid;grid-template-columns:minmax(0,760px) minmax(0,240px);gap:40px;align-items:start}.article{max-width:780px}.article h2{font-size:25px;color:var(--ink);margin:38px 0 14px;line-height:1.4}.article h3{font-size:19px;color:var(--ink);margin:22px 0 10px}.article p{margin:0 0 17px}.article ul,.article ol{padding-left:24px}.article li{margin:7px 0}.aside-note{background:var(--mist);border-radius:16px;padding:22px;position:sticky;top:20px}.aside-note h2{font-size:20px;margin:0 0 14px;color:var(--ink)}.aside-note dl{margin:0}.aside-note dt{font-weight:700;color:var(--ink);margin-top:14px}.aside-note dd{margin:4px 0 0;font-size:14px}.content-section{padding:23px 0 35px;border-top:1px solid var(--line)}.content-section h2{font-size:25px;color:var(--ink);margin:6px 0 17px}.content-section p{margin:0 0 15px}.content-section h3{font-size:19px;color:var(--ink);margin:25px 0 8px}.table-wrap{max-width:100%;overflow-x:auto;border:1px solid var(--line);border-radius:12px;margin:20px 0 26px}.data-table{width:100%;border-collapse:collapse;min-width:600px;background:white;text-align:left;font-size:15px}.data-table th{background:#e4f2f8;color:var(--ink);font-weight:700}.data-table th,.data-table td{padding:14px 17px;border-bottom:1px solid var(--line);vertical-align:top}.data-table tr:last-child td{border-bottom:0}.timeline{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:17px;counter-reset:timeline}.timeline article{padding:25px 22px;background:white;border:1px solid var(--line);border-radius:14px}.timeline article:before{counter-increment:timeline;content:counter(timeline);display:grid;place-items:center;border-radius:50%;width:37px;height:37px;margin-bottom:15px;background:#d4f5f5;color:var(--navy);font-weight:800}.timeline h3{margin:0 0 9px;font-size:19px;color:var(--ink)}.timeline p{margin:0;font-size:15px}.tag-list{display:flex;gap:9px;flex-wrap:wrap;padding:0;list-style:none}.tag-list a{display:inline-block;padding:6px 13px;background:var(--mist);border:1px solid var(--line);text-decoration:none;border-radius:6px;font-size:13px}.matrix{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.matrix-card{padding:24px;background:#fff;border:1px solid var(--line);border-top:4px solid var(--cyan);border-radius:12px}.matrix-card h3{margin:0 0 12px;color:var(--ink)}.matrix-card p{margin:8px 0;font-size:15px}.gallery{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.gallery figure{margin:0;padding:15px;background:white;border-radius:14px;border:1px solid var(--line)}.gallery figcaption{padding:13px 6px 5px;font-size:14px}.gallery figcaption strong{display:block;color:var(--ink);font-size:18px;margin-bottom:6px}.gallery .media{height:205px}.handbook-nav{display:flex;flex-wrap:wrap;gap:12px;padding:15px 0 26px}.handbook-nav a{background:white;padding:11px 17px;border:1px solid var(--line);border-radius:9px;text-decoration:none;font-weight:700;font-size:14px}.faq-item{background:white;border:1px solid var(--line);border-radius:10px;margin-bottom:10px;padding:0 18px}.faq-item summary{list-style-position:outside;cursor:pointer;padding:14px 4px;color:var(--ink);font-weight:700}.faq-item p{padding:0 4px 15px;margin:0;color:var(--text)}.service-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.notice{padding:18px 23px;background:var(--soft);border-left:4px solid var(--cyan);border-radius:8px}.notice p{margin:0}.related{padding:36px 0 55px}.related-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:13px}.related a{display:flex;justify-content:space-between;align-items:center;background:white;border:1px solid var(--line);border-radius:10px;padding:18px;text-decoration:none;font-weight:700}.editor-note{font-size:14px;color:var(--muted);padding-bottom:18px}.site-footer{background:var(--footer);color:#EAF7FF;padding:48px 0 20px}.footer-grid{display:grid;grid-template-columns:2fr 1fr;gap:100px}.footer-grid h2{font-size:22px;line-height:1.4;margin:8px 0 14px;color:white}.footer-grid p{max-width:660px;margin:0;color:#d4e9f4;font-size:14px}.footer-grid .footer-brand{font-size:13px;font-weight:800;letter-spacing:.16em;color:#6de1ec}.footer-grid nav{display:grid;grid-template-columns:1fr 1fr;gap:6px 18px}.footer-grid nav strong{grid-column:1/-1}.footer-grid a{color:#dff6ff;font-size:14px;text-decoration:none}.footer-grid a:hover{text-decoration:underline}.footer-bottom{margin-top:40px;border-top:1px solid #3c6077;padding-top:16px;display:flex;justify-content:space-between;gap:12px;font-size:12px;color:#b9d5e4}.back-top{position:fixed;right:18px;bottom:22px;border:1px solid var(--line);border-radius:50%;width:43px;height:43px;background:white;color:var(--navy);box-shadow:0 3px 14px #0b3b5b18;z-index:5}@media(max-width:980px){.wrap{width:calc(100% - 44px)}.header-top{height:63px;gap:12px;justify-content:space-between}.menu-toggle{display:flex;flex:none;width:40px;height:40px;background:white;border:1px solid var(--line);border-radius:9px;align-items:center;justify-content:center;flex-direction:column;gap:4px}.menu-toggle span{width:18px;height:2px;background:var(--navy);border-radius:2px}.brand{min-width:0;margin-right:auto;margin-left:5px}.brand .media{height:30px;max-width:170px}.brand .media img{max-height:30px}.brand-fallback{font-size:14px}.header-tagline,.desktop-nav{display:none}.header-cta{font-size:12px;padding:6px 12px;min-height:39px}.drawer-backdrop{display:block;position:fixed;inset:0;background:#09253a92;z-index:40;visibility:hidden;opacity:0;pointer-events:none;transition:opacity .2s,visibility .2s}.mobile-drawer{display:block;position:fixed;inset:0 auto 0 0;width:min(86vw,344px);background:white;z-index:41;overflow-y:auto;padding:20px 20px 36px;transform:translateX(-105%);visibility:hidden;transition:transform .2s,visibility .2s;box-shadow:15px 0 50px #12365322}.drawer-open{overflow:hidden}.drawer-open .drawer-backdrop{opacity:1;visibility:visible;pointer-events:auto}.drawer-open .mobile-drawer{visibility:visible;transform:translateX(0)}.drawer-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;color:var(--ink)}.drawer-close{background:var(--mist);color:var(--ink);border:0;border-radius:8px;font-size:26px;width:40px;height:40px;line-height:1}.drawer-group{font-size:12px;font-weight:700;color:#718596;border-bottom:1px solid var(--line);padding:15px 0 5px;margin:10px 0 5px}.mobile-drawer>a{display:block;padding:9px 8px;color:var(--ink);text-decoration:none;font-weight:700}.drawer-note{font-size:12px;color:var(--muted);margin-top:22px}.topic-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.article-layout{grid-template-columns:minmax(0,1fr) 220px;gap:24px}.footer-grid{gap:30px}.mobile-bottom{display:grid;grid-template-columns:repeat(4,1fr);position:fixed;bottom:0;left:0;right:0;z-index:15;background:#fff;border-top:1px solid var(--line);padding:5px 0 calc(5px + env(safe-area-inset-bottom));box-shadow:0 -2px 12px #1236530a}.mobile-bottom a{display:flex;flex-direction:column;align-items:center;justify-content:center;line-height:1.2;gap:3px;text-decoration:none;color:var(--muted);font-size:11px;min-height:44px}.mobile-bottom a span{font-size:19px;color:var(--navy)}.mobile-bottom a[aria-current=page]{font-weight:800;color:var(--navy)}.site-footer{padding-bottom:calc(90px + env(safe-area-inset-bottom))}.back-top{bottom:calc(85px + env(safe-area-inset-bottom))}}@media(max-width:760px){.wrap{width:calc(100% - 32px)}.hero{grid-template-columns:1fr;padding-top:32px;padding-bottom:35px;gap:22px}.hero .hero-copy{order:1}.hero>.media{order:2}.hero h1{font-size:30px}.hero p{font-size:15px}.quick-topics-inner{gap:8px 20px}.split,.split--wide,.editorial-grid,.article-layout{grid-template-columns:1fr}.aside-note{position:static}.topic-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.mini-grid,.steps,.timeline,.matrix{grid-template-columns:1fr 1fr}.footer-grid{grid-template-columns:1fr}.page-header{padding:34px 0 20px}.page-header h1{font-size:27px}.page-header .lead{font-size:15px}.section{padding:32px 0}.gallery{gap:12px}.related-grid{grid-template-columns:1fr}.service-grid{grid-template-columns:1fr}}@media(max-width:640px){.media--hero{height:200px}.media--feature{height:180px}.media--card{height:145px}.media--banner{height:150px}.media--mobile{height:290px;max-width:250px}.media.panorama{max-height:155px}.media.panorama img{max-height:150px}.topic-grid{grid-template-columns:1fr 1fr;gap:10px}.topic-card{padding:16px;min-height:170px}.topic-card strong{font-size:16px}.topic-card span{font-size:13px}.feature-panel,.small-panel,.surface{padding:19px}.mini-grid,.steps,.timeline,.matrix,.gallery{grid-template-columns:1fr}.gallery .media{height:175px}.section h2,.related h2,.content-section h2{font-size:22px}.article h2{font-size:22px}.article h3{font-size:18px}.article{font-size:15px}.section-head{align-items:start;flex-direction:column;gap:6px}.quick-topics .quick-group{flex-wrap:wrap}.footer-bottom{flex-direction:column}.header-top .brand{max-width:45%}.media--logo{height:30px}.back-top{width:38px;height:38px;right:12px}.data-table{font-size:13px}.data-table th,.data-table td{padding:10px 12px}}@media(max-height:430px) and (max-width:980px){.mobile-bottom{position:static}.site-footer{padding-bottom:20px}.back-top{bottom:16px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}
