:root{--bg:#F4FBFF;--white:#fff;--soft:#EAF7FF;--brand:#1CA8F6;--link:#0877C9;--ink:#223044;--muted:#5F7082;--deep:#082A46}*{box-sizing:border-box}html{scroll-behavior:smooth}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-decoration:none}a:hover{text-decoration:underline}button{font:inherit;cursor:pointer}img{max-width:100%;height:auto}.container{max-width:1160px;margin:auto;padding-left:24px;padding-right:24px}.site-header{position:sticky;top:0;z-index:1000;background:#fff;border-bottom:1px solid #e0edf7;box-shadow:0 2px 12px #163f5c0a}.header-inner{max-width:1160px;height:70px;padding:0 24px;margin:auto;display:flex;align-items:center;gap:26px}.logo{display:flex;align-items:center;flex-shrink:0;color:var(--link);min-width:132px}.logo strong{font-size:23px;white-space:nowrap}.logo-media{max-width:165px}.logo img{height:36px;width:auto;object-fit:contain}.main-nav{display:flex;gap:23px;align-items:center;justify-content:center;flex:1;white-space:nowrap}.main-nav a{font-size:14px;color:var(--ink);height:70px;display:inline-flex;align-items:center;border-bottom:2px solid transparent}.main-nav a.active,.main-nav a:hover{color:var(--link);border-bottom-color:var(--brand);text-decoration:none}.main-btn{display:inline-flex;align-items:center;justify-content:center;height:40px;min-width:78px;padding:0 18px;background:#0877C9;color:#fff;border-radius:999px;font-weight:700;white-space:nowrap;line-height:1}.main-btn:hover{text-decoration:none;background:#065f9f}.quick-nav{background:var(--soft);border-bottom:1px solid #d5edfa}.quick-inner{display:flex;gap:0;align-items:center;max-width:1160px;margin:auto;padding:0 24px;overflow-x:auto;white-space:nowrap;scrollbar-width:thin}.quick-inner a{padding:8px 16px;color:var(--muted);font-size:13px;flex:none;position:relative}.quick-inner a+a:before{content:'';position:absolute;left:0;top:13px;height:16px;width:1px;background:#c4dbe9}.quick-inner a.active{color:var(--link);font-weight:700}main.container{padding-top:30px;padding-bottom:55px;min-height:60vh}.page-hero,.hero-feature{background:#fff;border:1px solid #e0eef9;border-radius:14px;padding:30px;margin-bottom:26px}.eyebrow{font-size:13px;color:var(--link);font-weight:700;letter-spacing:.08em}h1,h2,h3{line-height:1.4;letter-spacing:.005em;margin:0 0 14px}h1{font-size:32px}h2{font-size:23px}h3{font-size:18px}p{margin:0 0 16px}.lead{font-size:17px;color:var(--muted);max-width:790px}.article-layout{display:grid;grid-template-columns:minmax(0,3fr) minmax(210px,1fr);gap:22px;align-items:start}.article{min-width:0;background:#fff;border-radius:14px;padding:30px;border:1px solid #e0eef9}.article section{margin-bottom:30px;border-bottom:1px solid #eaf0f5;padding-bottom:12px}.article section:last-child{border:0;margin-bottom:0}.article p{line-height:1.85}.article h2{border-left:3px solid var(--brand);padding-left:13px;font-size:22px}.article h3{font-size:18px}.related{background:#fff;border:1px solid #e0eef9;border-radius:12px;padding:22px;position:sticky;top:130px}.related h2{font-size:18px}.related p{font-size:13px;color:var(--muted)}.related ul{list-style:none;padding:0;margin:0}.related li{padding:9px 0;border-bottom:1px solid #edf3f8}.related li:last-child{border:0}.topic-links{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.topic-links a{padding:6px 12px;border:1px solid #cfe5f4;border-radius:7px;background:#f7fcff;font-size:14px}.note{padding:18px 20px;background:var(--soft);border-radius:10px;color:#34556d;font-size:14px;margin:22px 0}.media{display:flex;align-items:center;justify-content:center;min-width:0;max-width:100%;overflow:hidden;border-radius:12px;background:var(--soft)}.media img{display:block;width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain;object-position:center}.media-natural img{max-height:280px}.media-banner{aspect-ratio:16/7}.media-wide{aspect-ratio:16/9}.media-device{aspect-ratio:9/16;max-width:240px}.media-logo{aspect-ratio:2/1}.media-placeholder{width:100%;min-height:105px;background:linear-gradient(120deg,#eaf7ff,#f5fbff);border:1px solid #e0eef9;border-radius:12px}.hero-feature{display:grid;grid-template-columns:55fr 45fr;gap:26px;align-items:center}.hero-feature .media img{max-height:290px}.hero-feature .media-placeholder{height:240px}.hero-feature h1{font-size:36px}.hero-feature .lead{font-size:16px}.section-block{padding:25px 28px;margin-bottom:26px;background:#fff;border:1px solid #e0eef9;border-radius:14px}.section-head{display:flex;align-items:baseline;justify-content:space-between;gap:14px;border-bottom:1px solid #e6f1f8;margin-bottom:19px;padding-bottom:10px}.section-head h2{margin:0}.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:15px}.topic-card{padding:17px;border:1px solid #dbeaf5;border-radius:12px;background:#fbfeff}.topic-card h3{font-size:17px}.topic-card p{font-size:14px;color:var(--muted)}.split{display:grid;grid-template-columns:1.1fr .9fr;gap:25px;align-items:center}.numbered-list{counter-reset:items;list-style:none;padding:0;margin:0}.numbered-list li{counter-increment:items;display:grid;grid-template-columns:38px 1fr;gap:12px;border-bottom:1px solid #e9f1f6;padding:14px 0}.numbered-list li:before{content:counter(items,decimal-leading-zero);color:#1ca8f6;font-weight:bold;font-size:22px}.numbered-list h3{margin:0 0 4px}.numbered-list p{font-size:14px;color:var(--muted)}.brand-card{padding:11px;text-align:center;border:1px solid #e3edf5;border-radius:12px;background:#fff;min-width:0}.brand-card .media-placeholder{min-height:90px}.brand-card .media{height:115px}.brand-card h3{font-size:15px;margin:10px 0 3px}.brand-card p{font-size:12px;color:var(--muted);line-height:1.6;margin:0}.media-row{margin:16px 0}.gallery-grid .topic-card .media{max-height:220px}.faq-item{padding:18px 0;border-bottom:1px solid #e6f1f8}.faq-item h2{font-size:18px;border:0;padding:0}.faq-item p{margin:0}.site-footer{background:var(--deep);color:#eaf8ff;padding-top:43px}.footer-grid{display:grid;grid-template-columns:1.5fr repeat(3,1fr);gap:30px}.footer-grid h2{color:#fff;font-size:17px}.footer-grid a{display:block;color:#d4ebfa;font-size:14px;margin:5px 0}.footer-grid p{font-size:14px;color:#d4ebfa}.footer-brand .logo-media{max-width:145px;margin-bottom:14px}.footer-bottom{border-top:1px solid #31556e;margin-top:28px;padding-top:16px;padding-bottom:22px;font-size:13px;color:#d4ebfa;display:flex;justify-content:space-between;gap:20px}.footer-bottom p{margin:0;font-size:13px}.menu-button,.mobile-bottom,.mobile-drawer,.drawer-mask{display:none}.mobile-drawer,.drawer-mask{pointer-events:none}a:focus-visible,button:focus-visible{outline:3px solid #38c7ff;outline-offset:2px}
@media(max-width:980px){.header-inner{height:58px;justify-content:space-between;gap:8px;padding:0 20px}.main-nav{display:none}.logo{min-width:0;justify-content:center}.logo img{height:29px}.logo strong{font-size:21px}.menu-button{display:flex;flex-direction:column;gap:5px;align-items:center;justify-content:center;border:0;background:transparent;width:38px;height:38px;flex-shrink:0}.menu-button span{display:block;width:23px;height:2px;background:var(--ink)}.main-btn{height:36px;min-width:65px;padding:0 12px;font-size:14px}.quick-inner{padding:0 20px}.mobile-bottom{display:grid;grid-template-columns:repeat(4,1fr);position:fixed;bottom:0;left:0;right:0;background:#fff;border-top:1px solid #dbeaf5;z-index:1000;height:60px}.mobile-bottom a{display:flex;align-items:center;justify-content:center;font-size:14px;color:#5f7082}.mobile-bottom a.active{font-weight:700;color:#0877c9}.site-footer{padding-bottom:62px}.mobile-drawer{display:block;position:fixed;inset:0 auto 0 0;width:min(84vw,320px);height:100dvh;background:#fff;color:var(--ink);z-index:12000;overflow-y:auto;transform:translateX(-105%);visibility:hidden;pointer-events:none;transition:transform .2s ease,visibility .2s}.mobile-drawer.is-open{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-mask{display:block;position:fixed;inset:0;background:rgba(8,42,70,.42);z-index:11000;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s ease,visibility .2s}.drawer-mask.is-visible{opacity:1;visibility:visible;pointer-events:auto}body.drawer-open{overflow:hidden}.drawer-top{display:flex;align-items:center;justify-content:space-between;padding:17px;border-bottom:1px solid #e7f0f6}.drawer-top button{border:0;background:var(--soft);width:35px;height:35px;border-radius:8px;font-size:26px}.drawer-group{padding:10px 18px;border-bottom:1px solid #e6f1f7}.drawer-group h2{font-size:15px;color:var(--link);margin:8px 0}.drawer-group a{display:block;min-height:40px;padding:7px 5px;color:#223044;font-size:14px}.drawer-group a.active{color:var(--link);font-weight:700}}
@media(max-width:768px){.container{padding-left:20px;padding-right:20px}.article-layout{grid-template-columns:1fr}.related{position:static}.hero-feature{grid-template-columns:1fr}.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}.split{grid-template-columns:1fr}.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-bottom{display:block}.hero-feature .media-placeholder{height:175px}.hero-feature .media img{max-height:190px}}
@media(max-width:480px){.container{padding-left:16px;padding-right:16px}.header-inner{padding:0 16px}.quick-inner{padding:0 8px}.quick-inner a{padding:8px 12px}.page-hero,.hero-feature,.section-block,.article{padding:19px}.hero-feature h1{font-size:27px}h1{font-size:25px}h2{font-size:20px}.article h2{font-size:20px}.grid-3{grid-template-columns:1fr}.grid-2{grid-template-columns:1fr}.hero-feature .media img{max-height:180px}.footer-grid{gap:20px}.brand-card .media{height:95px}}
@media(max-width:350px){.logo strong{font-size:18px}.logo img{max-width:133px}.header-inner{padding:0 12px}.main-btn{padding:0 10px;min-width:60px}.menu-button{width:34px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important}}