*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#F4FBFF;color:#223044;font:16px/1.8 Arial,"PingFang SC","Microsoft YaHei",sans-serif}a{color:#0877C9;text-decoration:none}a:hover{text-decoration:underline}a:focus-visible,button:focus-visible{outline:3px solid #0877C9;outline-offset:3px}h1,h2,h3{line-height:1.35;color:#223044}h1{font-size:33px;margin:0 0 16px}h2{font-size:24px;margin:0 0 16px}h3{font-size:19px;margin:12px 0}p{margin:0 0 16px}.container{width:min(1160px,calc(100% - 48px));margin-inline:auto}.skip-link{position:absolute;left:-9999px}.skip-link:focus{left:12px;top:12px;background:white;z-index:13000}.site-header{position:sticky;top:0;z-index:3000;background:white;border-bottom:1px solid #dcebf5}.header-inner{height:70px;display:flex;align-items:center;gap:24px}.brand{display:flex;align-items:center;gap:8px;min-width:148px;color:#0877C9;white-space:nowrap}.brand-fallback{font-size:17px}.logo-media{height:38px;width:80px;background:transparent;border-radius:0}.logo-media img{max-height:100%;width:auto;max-width:100%;object-fit:contain}.logo-media .media-placeholder{display:none}.desktop-nav{display:flex;align-items:center;gap:21px;margin-left:auto;white-space:nowrap}.desktop-nav a{display:inline-flex;align-items:center;height:70px;color:#223044;font-size:14px;border-bottom:2px solid transparent}.desktop-nav a.active,.desktop-nav a:hover{color:#0877C9;border-color:#1CA8F6;text-decoration:none}.main-btn{display:inline-flex;align-items:center;justify-content:center;flex:none;min-width:78px;height:40px;padding:0 18px;background:#0877C9;color:white;border-radius:999px;font-weight:700;white-space:nowrap}.main-btn:hover{color:white}.quick-strip{background:#EAF7FF;border-bottom:1px solid #d9eefa}.quick-inner{height:44px;display:flex;align-items:center;gap:0;overflow-x:auto;white-space:nowrap;scrollbar-width:thin}.quick-inner a{flex:none;padding:0 16px;color:#5F7082;font-size:14px;border-right:1px solid #d1e6f5}.quick-inner a:first-child{padding-left:0}.quick-inner a.active,.quick-inner a:hover{color:#0877C9}.main-area{padding-top:32px;padding-bottom:46px;min-width:0}.panel,.article-panel,.index-panel{background:white;border:1px solid #e3eef5;border-radius:14px;padding:24px;margin-bottom:24px;min-width:0}.eyebrow{font-size:13px;font-weight:700;color:#0877C9;letter-spacing:.07em;margin-bottom:8px}.lead{color:#435972;font-size:17px}.breadcrumbs{font-size:13px;color:#62758a;margin-bottom:18px}.breadcrumbs a{color:#62758a}.article-layout{display:grid;grid-template-columns:minmax(0,3fr) minmax(210px,1fr);gap:20px;align-items:start}.article-panel{padding:30px}.article-panel section{padding:8px 0 14px;border-bottom:1px solid #e6f0f8;margin-bottom:10px}.article-panel section:last-child{border-bottom:0}.article-panel section p{line-height:1.85}.side-panel{position:sticky;top:130px}.side-panel h2{font-size:18px}.side-panel a{display:block;border-bottom:1px solid #edf3f8;padding:9px 0;font-size:14px}.related-links{display:flex;flex-wrap:wrap;gap:9px;margin:22px 0 0}.related-links a,.pill-link{border:1px solid #cde9f7;background:#f5fbff;border-radius:30px;padding:5px 13px;font-size:14px}.two-col{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.three-col{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.four-col{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}.hero-split{display:grid;grid-template-columns:55fr 45fr;gap:24px;align-items:center}.feature-split{display:grid;grid-template-columns:1fr 1fr;gap:22px;align-items:center}.feature-split.reverse>div:first-child{order:2}.subtle{color:#5F7082}.topic-card{padding:18px;border-radius:12px;background:#f5fbff;border:1px solid #dfedf7}.topic-card h3{margin:0 0 7px}.topic-card p{font-size:14px;color:#506279}.section-heading{border-left:4px solid #1CA8F6;padding-left:13px;margin:0 0 19px}.number-list{counter-reset:item;list-style:none;padding:0;margin:0}.number-list li{counter-increment:item;padding:14px 0 14px 46px;position:relative;border-bottom:1px solid #e5eff7}.number-list li:before{content:counter(item,decimal-leading-zero);position:absolute;left:0;top:13px;color:#0877C9;font-weight:700}.number-list li strong{display:block}.media{display:flex;align-items:center;justify-content:center;min-width:0;max-width:100%;border-radius:12px;background:#EAF7FF;overflow:hidden}.media img{display:block;width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain;object-position:center}.media-natural{min-height:80px}.media-natural img{width:100%;height:auto;max-height:280px;object-fit:contain}.media-banner{height:265px}.media-wide{height:190px}.media-device{height:295px}.media-brand{height:112px}.media-placeholder{width:100%;height:100%;min-height:80px;background:linear-gradient(135deg,#eaf7ff,#d9effd);border-radius:12px}.media-banner .media-placeholder{min-height:265px}.media-wide .media-placeholder{min-height:190px}.media-device .media-placeholder{min-height:295px}.media-brand .media-placeholder{min-height:112px}.brand-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.brand-card{border:1px solid #e3eef5;border-radius:12px;padding:12px;min-width:0}.brand-card h3{font-size:16px;margin:8px 0 4px}.brand-card p{font-size:13px;color:#5F7082;margin:0}.faq-item{border-bottom:1px solid #e4eff7;padding:10px 0}.faq-item h3{font-size:17px}.site-footer{background:#082A46;color:#EAF8FF;padding:36px 0 18px}.footer-grid{display:grid;grid-template-columns:1.5fr repeat(3,1fr);gap:32px}.footer-grid h2{font-size:16px;color:white}.footer-grid a{display:block;font-size:14px;color:#EAF8FF;margin-bottom:7px}.footer-mark{font-weight:bold;font-size:18px!important}.footer-about p{font-size:14px;color:#d6eaf5}.footer-bottom{border-top:1px solid #34566e;padding-top:16px;margin-top:26px;font-size:12px;color:#d6eaf5}.bottom-nav,.mobile-drawer,.drawer-mask,.menu-toggle{display:none}.drawer-top{display:flex;justify-content:space-between;align-items:center;padding:16px;border-bottom:1px solid #e5f0f8}.drawer-close{border:0;background:none;font-size:30px;cursor:pointer;color:#223044}.drawer-group{padding:14px 20px;border-bottom:1px solid #edf3f8}.drawer-group h2{font-size:15px;color:#0877C9;margin:0 0 7px}.drawer-group a{display:block;padding:6px 0;color:#223044;min-height:40px}.drawer-group a:hover{color:#0877C9}.warning-note{border-left:3px solid #1CA8F6;padding:12px 16px;background:#f0faff;color:#435972}.tiny{font-size:13px;color:#5F7082} @media(max-width:980px){.desktop-nav{display:none}.header-inner{height:58px;justify-content:space-between;gap:8px}.brand{min-width:0}.logo-media{height:29px;width:58px}.brand-fallback{font-size:15px}.main-btn{min-width:70px;height:36px;padding:0 12px;font-size:14px}.menu-toggle{display:flex;flex-direction:column;justify-content:center;gap:4px;flex:none;width:36px;height:36px;padding:7px;border:0;background:white;cursor:pointer}.menu-toggle span{display:block;height:2px;width:100%;background:#223044}.mobile-drawer{display:block;position:fixed;inset:0 auto 0 0;width:min(84vw,320px);height:100dvh;background:white;color:#223044;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}.bottom-nav{position:fixed;z-index:2500;display:grid;grid-template-columns:repeat(4,1fr);height:60px;bottom:0;left:0;right:0;background:#fff;border-top:1px solid #dfeef7}.bottom-nav a{text-align:center;align-content:center;color:#0877C9;font-size:14px}.site-footer{padding-bottom:84px}.side-panel{position:static}.article-layout{grid-template-columns:1fr}.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.brand-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}@media(max-width:700px){.container{width:calc(100% - 32px)}.main-area{padding-top:20px}.panel,.article-panel,.index-panel{padding:18px;margin-bottom:18px}h1{font-size:26px}h2{font-size:21px}h3{font-size:17px}.two-col,.three-col,.hero-split,.feature-split{grid-template-columns:1fr}.feature-split.reverse>div:first-child{order:0}.four-col{grid-template-columns:repeat(2,minmax(0,1fr))}.brand-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.media-banner{height:175px}.media-wide{height:148px}.media-device{height:240px}.media-brand{height:100px}.media-banner .media-placeholder{min-height:175px}.media-wide .media-placeholder{min-height:148px}.media-device .media-placeholder{min-height:240px}.media-brand .media-placeholder{min-height:100px}.footer-grid{gap:18px}.lead{font-size:16px}}@media(max-width:350px){.brand-fallback{font-size:14px}.logo-media{width:40px}.footer-grid{grid-template-columns:1fr}.quick-inner a{padding:0 12px}}