:root{--bg:#F4F7FA;--white:#fff;--pale:#EAF1F6;--aqua:#E9F8F8;--nav:#102E46;--deep:#163C57;--teal:#13B8C5;--blue:#237BD3;--ink:#18364B;--body:#344C60;--muted:#64798A;--line:#DCE6ED;--footer:#0B2539;--page:1200px}
*,*::before,*::after{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:20px}body{margin:0;color:var(--body);font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.82;background:var(--bg);overflow-wrap:break-word}body.drawer-active{overflow:hidden}a{color:#166bb1;text-decoration-thickness:1px;text-underline-offset:3px}a:hover{color:#0b597f}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--teal);outline-offset:3px}img{max-width:100%}h1,h2,h3{color:var(--ink);line-height:1.38;letter-spacing:-.025em}h1{font-size:clamp(27px,3.3vw,42px);margin:0 0 20px}h2{font-size:clamp(21px,2.3vw,27px);margin:0 0 18px}h3{font-size:clamp(18px,1.6vw,21px);margin:0 0 12px}p{margin:0 0 16px}ul,ol{padding-left:1.35em}.container{width:min(calc(100% - 56px),var(--page));margin-inline:auto}.section{margin-block:64px}.section-label{color:#087b86;font-size:12px;letter-spacing:.17em;text-transform:uppercase;font-weight:800;margin-bottom:12px}.muted{color:var(--muted)}.eyebrow{font-size:13px;font-weight:750;color:#087d89;letter-spacing:.12em;margin:0 0 12px}.lead{font-size:18px;line-height:1.8;max-width:800px}.reading{max-width:790px}.reading p{margin-bottom:18px}.intro-band{background:var(--white);border-bottom:1px solid var(--line);padding:42px 0 40px}.intro-band h1{font-size:clamp(25px,3vw,36px)}.intro-band .lead{margin-bottom:0}.crumb{display:flex;gap:9px;align-items:center;color:var(--muted);font-size:13px;margin-bottom:23px}.crumb a{color:var(--muted)}.skip-link{position:absolute;z-index:200;top:-100px;left:15px;background:#fff;padding:10px}.skip-link:focus{top:10px}.site-header{position:relative;z-index:30}.brand-bar{background:#fff;border-bottom:1px solid var(--line)}.brand-inner{height:72px;display:flex;align-items:center;gap:24px}.brand{display:flex;align-items:center;max-width:250px;min-width:0;text-decoration:none}.brand img{display:block;width:auto;height:auto;max-height:38px;max-width:230px;object-fit:contain}.logo-fallback{font-weight:850;font-size:22px;color:var(--ink);line-height:1.05;white-space:nowrap}.logo-fallback small{font-size:9px;letter-spacing:.16em;display:block;color:var(--muted)}.brand-subtitle{font-size:12px;color:var(--muted);margin-right:auto;white-space:nowrap}.entry-button{margin-left:auto;white-space:nowrap;display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:0 21px;border-radius:10px;background:var(--nav);color:#fff;font-weight:700;font-size:14px;text-decoration:none}.entry-button:hover{background:#24607e;color:#fff}.desktop-nav{background:var(--nav)}.desktop-nav-inner{display:flex;align-items:stretch;justify-content:space-between;gap:4px}.desktop-nav a{position:relative;display:flex;align-items:center;justify-content:center;white-space:nowrap;flex:1;min-height:50px;padding:0 9px;color:#eaf5fa;text-decoration:none;font-size:14px;font-weight:600}.desktop-nav a:hover,.desktop-nav a.is-current{background:rgba(255,255,255,.08);color:#fff}.desktop-nav a.is-current:after{content:"";position:absolute;bottom:0;left:25%;right:25%;height:3px;background:var(--teal)}.menu-toggle{display:none;border:0;background:transparent;width:40px;height:40px;flex:none;align-items:center;justify-content:center;flex-direction:column;gap:5px;cursor:pointer}.menu-toggle span{height:2px;width:21px;background:var(--nav)}.drawer-overlay{position:fixed;inset:0;z-index:59;background:rgba(5,22,32,.48);visibility:hidden;pointer-events:none;opacity:0;transition:opacity .2s,visibility .2s}.drawer-overlay.is-open{opacity:1;visibility:visible;pointer-events:auto}.mobile-drawer{position:fixed;z-index:60;top:0;bottom:0;left:0;width:min(86vw,340px);overflow-y:auto;background:#fff;box-shadow:12px 0 32px rgba(5,25,35,.12);transform:translateX(-105%);visibility:hidden;transition:transform .24s,visibility .24s;padding:19px 22px}.mobile-drawer.is-open{visibility:visible;transform:translateX(0)}.drawer-head{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);padding-bottom:12px;font-size:19px;color:var(--ink)}.drawer-close{background:var(--pale);border:0;border-radius:8px;height:40px;width:40px;font-size:28px;line-height:1;cursor:pointer;color:var(--ink)}.drawer-group-title{color:var(--muted);font-weight:800;letter-spacing:.1em;margin:23px 0 6px;font-size:12px}.mobile-drawer nav a{display:block;padding:10px 12px;border-radius:9px;text-decoration:none;color:var(--ink);font-weight:650}.mobile-drawer nav a.is-current{background:var(--aqua);border-left:3px solid var(--teal)}.nojs-nav{display:none}.hero{padding:56px 0 28px;background:linear-gradient(115deg,#fff 5%,#f0f7fa 90%)}.hero-grid{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:42px;align-items:center}.hero h1{font-size:clamp(27px,3.5vw,43px)}.hero p{max-width:620px}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}.button{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:9px 18px;border-radius:10px;text-decoration:none;font-weight:750;font-size:14px}.button--primary{background:var(--nav);color:#fff}.button--primary:hover{background:var(--deep);color:#fff}.button--secondary{color:var(--ink);background:var(--aqua);border:1px solid #c6e8e8}.media-frame{display:flex;align-items:center;justify-content:center;width:100%;min-width:0;padding:8px;border-radius:14px;background:var(--pale);border:1px solid var(--line)}.media-frame img{display:block;width:auto;height:auto;max-width:100%;max-height:var(--media-limit,220px);object-fit:contain;object-position:center}.media-frame--hero{--media-limit:310px}.media-frame--feature{--media-limit:250px}.media-frame--card{--media-limit:185px}.media-frame--mobile{--media-limit:350px;max-width:320px}.media-frame--banner{--media-limit:210px}.media-empty{min-height:120px;color:#708596;font-size:13px;text-align:center;background:repeating-linear-gradient(135deg,#eaf1f6,#eaf1f6 13px,#f1f6f9 13px,#f1f6f9 26px)}.media-frame--hero.media-empty{min-height:200px}.media-frame--mobile.media-empty{min-height:245px}.topic-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));border-top:1px solid var(--line)}.topic-item{padding:23px 20px 25px 0;border-bottom:1px solid var(--line);display:grid;grid-template-columns:36px 1fr;gap:12px}.topic-item:nth-child(2n){padding-left:22px}.topic-number{font-size:15px;color:#10808b;font-weight:800}.topic-item h3{margin-bottom:7px}.topic-item h3 a{text-decoration:none;color:var(--ink)}.topic-item p{font-size:14px;color:var(--muted);margin-bottom:8px}.split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:42px;align-items:center}.split--wide{grid-template-columns:minmax(0,1.4fr) minmax(0,.6fr)}.feature-panel{padding:32px;background:var(--white);border:1px solid var(--line);border-radius:14px}.feature-panel--deep{background:var(--nav);color:#e7f1f6;border:none}.feature-panel--deep h2,.feature-panel--deep h3{color:#fff}.feature-panel--deep a{color:#96e4f0}.focus-grid{display:grid;grid-template-columns:minmax(0,2fr) minmax(0,1fr);gap:22px}.focus-side{display:grid;gap:18px}.focus-side article{border-top:3px solid var(--teal);padding:14px 0}.focus-side article h3{font-size:19px}.editorial-strip{background:var(--aqua);padding:39px 0}.editorial-strip h2{margin-bottom:10px}.micro-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.micro-grid article{background:#fff;border:1px solid var(--line);padding:22px;border-radius:12px}.micro-grid article:nth-child(2){transform:translateY(15px)}.route-steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.route-steps a{display:block;background:#fff;border-top:4px solid var(--teal);padding:18px;border-radius:4px 4px 12px 12px;text-decoration:none}.route-steps b{display:block;font-size:12px;color:#087e8a}.route-steps strong{display:block;color:var(--ink);margin:6px 0}.route-steps span{display:block;font-size:13px;color:var(--muted)}.two-column{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:54px;align-items:start}.sidebar{padding:22px;background:var(--white);border:1px solid var(--line);border-radius:12px}.sidebar h3{font-size:17px}.sidebar a{display:block;margin-bottom:12px;font-size:14px}.article-section{margin-bottom:49px;scroll-margin-top:22px}.article-section h2{padding-bottom:10px;border-bottom:1px solid var(--line)}.number-steps{list-style:none;counter-reset:steps;margin:20px 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