*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font:16px/1.8 system-ui,"PingFang SC","Microsoft YaHei",sans-serif;color:#333;background:#fff}a{color:inherit;text-decoration:none}button{font:inherit;cursor:pointer}img{max-width:100%}.container{max-width:1120px;margin:0 auto;padding:0 24px}.site-header{position:sticky;top:0;z-index:100;background:#fff;box-shadow:0 1px 8px #0000000b}.mainbar{border-bottom:1px solid #eee}.header-line{height:70px;display:flex;align-items:center;justify-content:space-between;gap:25px}.brand{min-width:120px;display:flex;align-items:center}.brand img{height:38px;width:auto;max-width:135px;object-fit:contain}.brand strong{font-size:24px;white-space:nowrap;color:#222}.brand span{color:#F45132}.primary-nav{display:flex;align-items:stretch;gap:25px;height:100%;margin:auto}.primary-nav a{white-space:nowrap;display:flex;align-items:center;font-size:14px;border-bottom:2px solid transparent}.primary-nav a:hover,.primary-nav a.active{color:#F45132;border-color:#F45132}.register,.btn-primary{display:inline-flex;align-items:center;justify-content:center;border-radius:999px;background:#F45132;color:white;font-weight:700;min-height:40px;padding:0 23px;white-space:nowrap}.register:hover,.btn-primary:hover{background:#FF684E}.topicbar{background:#F6F7F9}.topic-inner{display:flex;align-items:center;gap:26px;white-space:nowrap;overflow:auto;scrollbar-width:none;min-height:44px}.topic-inner::-webkit-scrollbar{display:none}.topic-inner a{font-size:13px;color:#666}.topic-inner a:hover,.topic-inner a.active{color:#F45132}.menu-btn{display:none;border:0;background:transparent;font-size:25px}.mobile-drawer,.drawer-mask{display:none}.drawer-top{display:flex;justify-content:space-between;align-items:center;padding:14px 18px;border-bottom:1px solid #eee}.drawer-top button{border:0;background:transparent;font-size:28px}.drawer-section{padding:10px 18px;border-bottom:1px solid #eee}.drawer-section h2{font-size:15px;color:#F45132;margin:8px 0}.drawer-section a{display:block;padding:7px 3px;font-size:14px}.drawer-section a.active{color:#F45132}.hero{display:grid;grid-template-columns:1.05fr .95fr;gap:32px;align-items:center;padding-top:30px;padding-bottom:18px}.eyebrow{color:#c07f2e;font-weight:700;font-size:12px;letter-spacing:1px}.hero h1{font-size:clamp(27px,3.1vw,38px);line-height:1.35;margin:10px 0 15px;color:#1A1A1A}.hero p,.lead{color:#666}.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}.btn-secondary{border:1px solid #ddd;border-radius:999px;padding:5px 20px;color:#333;font-weight:650}.section{margin-top:43px}.section-title{display:flex;align-items:end;justify-content:space-between;gap:15px;margin-bottom:20px;border-bottom:1px solid #e9e9e9;padding-bottom:10px}.section-title h2{margin:0;font-size:25px;color:#1A1A1A}.section-title a,.readmore{font-size:14px;color:#F45132;font-weight:650}.card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.topic-card,.feature-box,.copy-card,.visual-card{border:1px solid #ebebeb;border-radius:13px;background:#fff;overflow:hidden}.topic-card{display:block;padding:20px}.topic-card h3,.copy-card h3{margin:3px 0 9px;font-size:19px}.topic-card p,.copy-card p,.visual-card p{color:#666;font-size:14px;line-height:1.65}.topic-card:hover,.visual-card:hover{border-color:#f5ad99}.split{display:grid;grid-template-columns:1.45fr 1fr;gap:20px}.feature-box,.copy-card{padding:24px}.feature-box h3{font-size:23px;margin:3px 0 13px}.vertical-links{display:grid;gap:0}.vertical-links a{padding:13px 0;border-bottom:1px solid #eee}.vertical-links a:last-child{border:0}.visual-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}.visual-grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}.visual-grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}.visual-card .copy{padding:12px 15px}.visual-card h3{font-size:16px;line-height:1.5;margin:0}.visual-card p{margin:5px 0}.media{background:#F6F7F9;border-radius:10px;overflow:hidden;max-width:100%;min-width:0;display:flex;justify-content:center;align-items:center}.media img{display:block;object-fit:contain;object-position:center;width:100%;height:100%}.media-natural img{height:auto;max-height:280px}.media-wide{aspect-ratio:16/9}.media-square{aspect-ratio:1}.media-portrait{aspect-ratio:3/4}.media-banner{aspect-ratio:16/7}.media-placeholder{background:#F6F7F9;width:100%;min-height:145px;aspect-ratio:inherit}.feature-inline{display:grid;grid-template-columns:1fr 1.2fr;gap:25px;align-items:center}.feature-inline h3{font-size:23px}.news-row{display:flex;gap:20px;padding:18px 0;border-bottom:1px solid #eee}.number{font-size:23px;color:#D7A84B;font-weight:750;min-width:45px}.news-row strong{display:block}.news-row small{color:#666;display:block;line-height:1.7}.notice{border-left:3px solid #F45132;background:#F6F7F9;padding:18px 22px;border-radius:0 10px 10px 0}.page-head{padding-top:30px;padding-bottom:10px}.crumb{font-size:13px;color:#888}.page-head h1{font-size:33px;color:#1A1A1A;line-height:1.4;margin:14px 0}.page-head .lead{max-width:760px}.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 270px;gap:38px}.prose{min-width:0;max-width:820px}.prose h2{font-size:24px;line-height:1.45;margin:34px 0 12px;color:#1A1A1A}.prose p{line-height:1.9;margin:0 0 16px}.aside{padding-top:25px}.aside h2{font-size:18px;border-bottom:2px solid #F45132;padding-bottom:8px}.aside a{display:block;border-bottom:1px solid #eee;padding:11px 0;font-size:14px}.inline-photo{max-width:730px;margin:23px 0}.explore-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.explore-grid .topic-card{padding:15px}.faq-list details{padding:15px 0;border-bottom:1px solid #eee}.faq-list summary{font-weight:700;cursor:pointer}.footer{background:#1A1A1A;color:#F5F5F5;margin-top:65px}.foot-grid{padding-top:36px;padding-bottom:28px;display:grid;grid-template-columns:1.3fr 1fr 1fr 1fr;gap:24px}.foot-grid h2{font-size:17px;margin:0 0 12px}.foot-grid p{font-size:14px;color:#dadada}.foot-grid a{display:block;color:#ddd;font-size:13px;margin:5px 0}.foot-end{padding-top:17px;padding-bottom:23px;border-top:1px solid #ffffff2c;display:flex;justify-content:space-between;gap:15px;color:#d6d6d6;font-size:12px}.mobile-bottom{display:none}.back-top{position:fixed;right:17px;bottom:19px;border:0;background:#F45132;color:#fff;border-radius:50%;width:42px;height:42px;opacity:0;pointer-events:none}.back-top.visible{opacity:1;pointer-events:auto}@media(max-width:980px){.container{padding-left:20px;padding-right:20px}.primary-nav{display:none}.menu-btn{display:block}.brand{min-width:0;margin:auto}.header-line{height:58px;gap:10px}.brand img{height:30px;max-width:110px}.register{min-height:36px;padding:0 16px}.mobile-drawer{display:block;position:fixed;inset:0 auto 0 0;width:min(84vw,320px);height:100dvh;background:#fff;z-index:12000;transform:translateX(-105%);transition:transform .2s ease;overflow-y:auto}.mobile-drawer.is-open{transform:translateX(0)}.drawer-mask{display:none;position:fixed;inset:0;background:#0006;z-index:11000;opacity:0;pointer-events:none}.drawer-mask.is-visible{display:block;opacity:1;pointer-events:auto}body.drawer-open{overflow:hidden}.mobile-bottom{display:flex;position:fixed;bottom:0;left:0;right:0;height:61px;background:white;box-shadow:0 -1px 8px #0002;z-index:90;justify-content:space-around;align-items:center}.mobile-bottom a{font-size:14px;color:#F45132}.footer{margin-bottom:61px}.back-top{bottom:78px}.article-layout{grid-template-columns:1fr}.aside{display:none}.foot-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:760px){.container{padding-left:16px;padding-right:16px}.hero{grid-template-columns:1fr;padding-top:20px}.hero .media{order:-1}.hero h1{font-size:28px}.card-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.visual-grid,.visual-grid.three{grid-template-columns:repeat(2,minmax(0,1fr))}.split,.feature-inline{grid-template-columns:1fr}.section{margin-top:30px}.section-title h2{font-size:21px}.page-head h1{font-size:27px}.foot-end{flex-direction:column}.foot-grid{gap:14px}.feature-inline .media{order:-1}}@media(max-width:380px){.topic-card{padding:14px}.card-grid{gap:10px}.topic-card h3{font-size:16px}.topic-card p{font-size:13px}.visual-grid{gap:10px}}@media(max-width:330px){.card-grid,.explore-grid{grid-template-columns:1fr}.hero h1{font-size:26px}}