*{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}button{font:inherit;cursor:pointer}.wrap{width:min(1160px,calc(100% - 48px));margin:auto}h1,h2,h3{line-height:1.35;color:#223044;overflow-wrap:anywhere}h1{font-size:34px;margin:0 0 20px}h2{font-size:24px;margin:0 0 16px}h3{font-size:19px;margin:0 0 10px}p{margin:0 0 17px}.site-header{height:70px;background:white;position:sticky;top:0;z-index:100;box-shadow:0 1px 9px #d5e8f552}.head-inner{display:flex;align-items:center;gap:26px;height:100%;justify-content:space-between}.logo{display:flex;align-items:center;min-width:144px;gap:8px;color:#0877C9;font-weight:800;white-space:nowrap}.logo .media{height:38px;width:105px;background:transparent}.logo .media img{height:100%;max-width:100%;object-fit:contain}.logo-text{font-size:17px}.desktop-nav{display:flex;align-items:center;gap:20px;height:100%;white-space:nowrap}.desktop-nav a{font-size:14px;height:100%;display:flex;align-items:center;color:#223044;border-bottom:2px solid transparent}.desktop-nav a.active,.desktop-nav a:hover{color:#0877C9;border-bottom-color:#1CA8F6;text-decoration:none}.main-btn{display:inline-flex;align-items:center;justify-content:center;min-width:78px;height:40px;padding:0 18px;background:#0877C9;color:white;border-radius:99px;font-weight:700;white-space:nowrap}.main-btn:hover{color:white;text-decoration:none;background:#0869af}.topic-bar{background:#EAF7FF}.topic-links{display:flex;overflow-x:auto;white-space:nowrap;gap:0;scrollbar-width:thin}.topic-links a{font-size:14px;color:#5F7082;padding:9px 13px;position:relative}.topic-links a+a:before{content:'·';position:absolute;left:-3px;color:#b8cbd6}.main-content{padding:34px 0 56px;min-height:65vh}.card,.paper,.feature-card,.article-section{background:#fff;border:1px solid #e0edf4;border-radius:13px;padding:25px}.paper{padding:34px}.lead{color:#5F7082;font-size:17px}.breadcrumb{font-size:13px;color:#5F7082;margin-bottom:21px}.breadcrumb a{color:#5F7082}.eyebrow{color:#0877C9;font-weight:700;font-size:13px;letter-spacing:.06em}.section-title{margin:36px 0 18px;border-left:4px solid #1CA8F6;padding-left:13px}.hero{display:grid;grid-template-columns:55fr 45fr;gap:26px;align-items:center}.media{display:flex;align-items:center;justify-content:center;max-width:100%;min-width:0;overflow:hidden;border-radius:12px;background:#EAF7FF}.media img{display:block;width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain;object-position:center}.media-natural img{width:100%;height:auto;max-height:280px;object-fit:contain}.media-hero{min-height:190px;max-height:290px}.media-hero img{max-height:290px}.media-brand{height:115px}.media-brand img{max-height:105px}.media-device{height:300px}.media-device img{max-height:290px;width:auto}.media-placeholder{min-height:105px}.media-hero.media-placeholder{min-height:245px}.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:18px}.four-col{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.article-layout{display:grid;grid-template-columns:minmax(0,3fr) minmax(205px,1fr);gap:24px;align-items:start}.article-body{min-width:0}.article-section{margin-bottom:18px}.article-section p{line-height:1.82}.sidebar{background:white;border:1px solid #e0edf4;border-radius:13px;padding:19px}.sidebar a,.links-column a{display:block;padding:9px 0;border-bottom:1px solid #ecf3f7}.sidebar a:last-child,.links-column a:last-child{border:0}.related{margin-top:28px;padding-top:20px;border-top:1px solid #dfeef7}.related a{margin-right:20px}.topic-tile h3{margin-bottom:8px}.topic-tile p{font-size:14px;color:#5F7082}.compact-list{list-style:none;margin:0;padding:0;counter-reset:contents}.compact-list li{counter-increment:contents;padding:15px 0;border-bottom:1px solid #e4edf3}.compact-list li:before{content:counter(contents,decimal-leading-zero);font-size:13px;color:#1CA8F6;margin-right:12px;font-weight:bold}.brand-grid .card{padding:12px}.brand-grid h3{font-size:15px;margin:7px 0 3px}.brand-grid p{font-size:13px;margin:0;color:#5F7082}.brand-grid .media-placeholder{min-height:100px}.site-footer{background:#082A46;color:#EAF8FF;padding:40px 0 22px}.site-footer h3{color:#EAF8FF;font-size:16px}.site-footer a{display:block;color:#EAF8FF;font-size:13px;padding:2px 0}.site-footer p{font-size:14px}.footer-grid{display:grid;grid-template-columns:1.2fr repeat(4,1fr);gap:23px}.footer-bottom{border-top:1px solid #ffffff30;font-size:13px;padding-top:18px;margin-top:25px}.menu-toggle,.mobile-bottom,.mobile-drawer,.drawer-mask{display:none}.drawer-head{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid #e1ecf4;padding:15px}.drawer-head button{background:transparent;border:0;font-size:30px}.mobile-drawer section{padding:9px 18px;border-bottom:1px solid #e1ecf4}.mobile-drawer h3{font-size:15px;margin:9px 0}.mobile-drawer section a{display:block;color:#223044;padding:7px 2px;min-height:40px;font-size:14px}.qa-item{border-bottom:1px solid #e5eef3;padding:12px 0}.qa-item h3{font-size:17px}.note{background:#EAF7FF;border-radius:10px;padding:17px;margin:20px 0}.visual-note{font-size:13px;color:#5F7082}.category-tiles{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.category-tiles .card{padding:18px}.section-plain{padding:18px 0;border-bottom:1px solid #dceaf3}.section-plain:last-child{border:0}@media(max-width:1100px){.desktop-nav{gap:11px}.head-inner{gap:13px}.logo{min-width:115px}.logo-text{display:none}.footer-grid{grid-template-columns:repeat(3,1fr)}}@media(max-width:980px){.site-header{height:58px}.head-inner{display:grid;grid-template-columns:1fr auto 1fr;gap:10px}.head-inner .main-btn{justify-self:end;height:36px}.logo{justify-self:center;min-width:0}.logo .media{height:30px;width:94px}.desktop-nav{display:none}.menu-toggle{display:block;justify-self:start;border:0;background:transparent;font-size:24px;color:#0877C9}.mobile-drawer{display:block;position:fixed;inset:0 auto 0 0;width:min(84vw,320px);height:100dvh;background:#fff;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}.mobile-bottom{display:grid;grid-template-columns:repeat(4,1fr);position:fixed;bottom:0;left:0;right:0;height:60px;background:#fff;box-shadow:0 -2px 10px #d5e8f590;z-index:90}.mobile-bottom a{display:flex;align-items:center;justify-content:center;font-size:14px;color:#0877C9}.site-footer{padding-bottom:83px}.article-layout{grid-template-columns:minmax(0,1fr)}.sidebar{order:2}}@media(max-width:768px){.wrap{width:calc(100% - 40px)}.hero{grid-template-columns:1fr}.three-col,.four-col{grid-template-columns:repeat(2,minmax(0,1fr))}.category-tiles{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.paper{padding:23px}.main-content{padding:25px 0 40px}h1{font-size:27px}h2{font-size:21px}.media-hero{max-height:190px}.media-hero img{max-height:190px}}@media(max-width:520px){.wrap{width:calc(100% - 32px)}body{font-size:15px}.two-col{grid-template-columns:1fr}.card,.article-section{padding:18px}.topic-links a{padding:9px 12px}.brand-grid .media-brand{height:85px}.brand-grid .media-brand img{max-height:79px}.brand-grid .card{padding:9px}.footer-grid{gap:14px}.main-btn{min-width:68px;padding:0 12px}.logo-text{display:none}.media-device{height:240px}.media-device img{max-height:230px}}