*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#fff;color:#333;font:16px/1.8 system-ui,"PingFang SC","Microsoft YaHei",sans-serif}a{color:inherit;text-decoration:none}a:hover{color:#f45132}button{font:inherit;cursor:pointer}img{max-width:100%}.wrap{width:min(100% - 48px,1160px);margin-inline:auto}.skip{position:absolute;top:-90px}.skip:focus{top:0;background:#fff;padding:8px;z-index:15000}.site-header{background:#fff;border-bottom:1px solid #eee}.topbar{display:flex;align-items:center;gap:22px;height:70px}.menu-toggle{width:42px;height:42px;border:0;background:transparent;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;flex-shrink:0}.menu-toggle span{width:21px;height:2px;background:#333}.brand{display:flex;align-items:center;flex-shrink:0;min-width:104px}.brand img{display:block;width:auto;max-width:136px;max-height:38px;object-fit:contain}.brand strong{font-size:25px;color:#222;white-space:nowrap}.brand strong span{color:#f45132}.topnav{display:flex;align-items:center;gap:30px;margin-left:auto;white-space:nowrap}.topnav a{height:70px;display:inline-flex;align-items:center;border-bottom:2px solid transparent;font-size:15px}.topnav a.active{color:#f45132;border-bottom-color:#f45132}.main-btn{display:inline-flex;align-items:center;justify-content:center;min-width:78px;height:40px;padding:0 20px;border-radius:999px;background:#f45132;color:#fff!important;font-weight:700;white-space:nowrap;margin-left:auto;flex-shrink:0}.main-btn:hover{background:#ff684e}.channel-bar{background:#f6f7f9;border-bottom:1px solid #eee}.channel-inner{height:44px;display:flex;align-items:center;gap:24px;overflow-x:auto;scrollbar-width:thin}.channel-inner a{white-space:nowrap;font-size:14px;color:#666}.channel-inner a.active,.channel-inner a:hover{color:#f45132}.mobile-drawer{display:block;position:fixed;inset:0 auto 0 0;width:360px;max-width:84vw;height:100dvh;background:#fff;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{position:fixed;inset:0;background:rgba(0,0,0,.38);z-index:11000;opacity:0;pointer-events:none}.drawer-mask.is-visible{opacity:1;pointer-events:auto}.drawer-mask[hidden]{display:none!important}body.drawer-open{overflow:hidden}.drawer-top{display:flex;justify-content:space-between;align-items:center;padding:20px;border-bottom:1px solid #eee}.drawer-top strong{font-size:18px}.drawer-top button{border:0;background:transparent;font-size:30px;line-height:1}.drawer-group{padding:16px 20px;border-bottom:1px solid #eee}.drawer-group h2{font-size:14px;color:#999;margin:0 0 8px}.drawer-links{display:grid;grid-template-columns:1fr 1fr;gap:2px 10px}.drawer-links a{display:flex;align-items:center;min-height:42px;font-size:14px}.drawer-links a.active{color:#f45132}.page{padding-block:30px 58px}.eyebrow{font-size:13px;color:#f45132;font-weight:700;letter-spacing:.08em}.page h1{font-size:34px;line-height:1.35;color:#1a1a1a;margin:8px 0 18px}.lead{max-width:850px;font-size:17px;line-height:1.85;color:#555}.section{margin-top:40px}.section h2{font-size:25px;line-height:1.35;color:#1a1a1a;margin:0 0 15px}.section h3{font-size:19px;line-height:1.45;color:#1a1a1a;margin:0 0 8px}.section p,.article-body p{margin:0 0 16px}.article-body{max-width:820px}.article-body section{padding:8px 0 15px;border-bottom:1px solid #eee}.article-body h2{font-size:24px;color:#1a1a1a;margin:12px 0 14px}.article-body h3{font-size:19px;color:#252525;margin:12px 0}.article-body p{line-height:1.85}.muted{color:#666}.grid{display:grid;gap:18px}.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}.card{padding:18px;border:1px solid #eceef0;border-radius:13px;background:#fff;min-width:0}.card h3{margin:10px 0 8px}.card p{margin:0;color:#666;font-size:14px;line-height:1.75}.card a.more,.more{display:inline-block;color:#e8482b;font-size:14px;font-weight:700;margin-top:10px}.soft{background:#f6f7f9;padding:22px;border-radius:13px}.media{display:flex;align-items:center;justify-content:center;max-width:100%;min-width:0;overflow:hidden;border-radius:12px;background:#f6f7f9}.media img{display:block;width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain;object-position:center}.media-wide{aspect-ratio:16/9}.media-banner{aspect-ratio:16/7}.media-square{aspect-ratio:1/1}.media-portrait{aspect-ratio:3/4}.media-device{aspect-ratio:9/16}.media-natural img{width:100%;height:auto;max-height:280px;object-fit:contain;margin:0 auto}.media-placeholder{width:100%;height:100%;min-height:92px;background:linear-gradient(120deg,#f4f5f6,#eceef0)}.hero-split{display:grid;grid-template-columns:58fr 42fr;gap:24px;align-items:start}.hero-split .media{height:auto;max-height:290px}.hero-notes article{padding:0 0 17px;margin-bottom:17px;border-bottom:1px solid #e8e8e8}.hero-notes h3{margin:0 0 5px}.hero-notes p{font-size:14px;color:#666;margin:0}.text-index>a{display:block;padding:13px 0;border-bottom:1px solid #eaeaea}.text-index a strong{display:block;color:#222}.text-index a span{display:block;font-size:14px;color:#666}.article-split{display:grid;grid-template-columns:1.3fr 1fr;gap:34px}.topic-strip{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.topic-strip a{border-bottom:1px solid #ddd;padding:12px 0}.topic-strip strong{display:block}.topic-strip small{color:#666}.feature-pair{display:grid;grid-template-columns:1fr 1fr;gap:26px}.figure-card{margin:0;min-width:0}.figure-card .media{margin-bottom:10px}.figure-card figcaption{font-size:14px;color:#666;line-height:1.7}.figure-card figcaption strong{display:block;font-size:16px;color:#1a1a1a}.related{display:flex;gap:10px;flex-wrap:wrap}.related a{border:1px solid #ededed;border-radius:99px;padding:5px 14px;font-size:14px}.notice{border-left:3px solid #d7a84b;padding:13px 18px;background:#f6f7f9;color:#555}.faq-list details{border-bottom:1px solid #eaeaea;padding:13px 0}.faq-list summary{font-weight:700;cursor:pointer}.faq-list p{margin:8px 0;color:#555}.site-footer{background:#1a1a1a;color:#f5f5f5;padding:44px 0 20px}.footer-grid{display:grid;grid-template-columns:1.5fr repeat(3,1fr);gap:35px}.footer-grid h2{font-size:17px;margin:0 0 14px}.footer-grid p{font-size:14px;line-height:1.8;color:#ccc}.footer-grid a{display:block;font-size:14px;line-height:2.2;color:#ddd}.footer-grid a:hover{color:#fff}.footer-bottom{border-top:1px solid #333;padding-top:18px;margin-top:30px;font-size:13px;color:#ccc}.footer-bottom p{margin:4px 0}.bottom-nav{display:none}.numbered{counter-reset:reading}.numbered>article{counter-increment:reading;display:flex;gap:16px;border-bottom:1px solid #eee;padding:13px 0}.numbered>article:before{content:counter(reading,decimal-leading-zero);font-weight:700;color:#d7a84b}.numbered h3{margin:0 0 4px}.numbered p{margin:0;font-size:14px;color:#666}@media(max-width:980px){.topnav{display:none}.topbar{height:58px;justify-content:space-between}.brand{position:absolute;left:50%;transform:translateX(-50%);min-width:0}.brand img{max-height:30px;max-width:116px}.brand strong{font-size:22px}.main-btn{height:36px;min-width:72px;padding:0 16px}.wrap{width:min(100% - 40px,1160px)}.mobile-drawer{width:min(84vw,320px)}.page h1{font-size:28px}.page{padding-bottom:90px}.bottom-nav{position:fixed;bottom:0;left:0;right:0;z-index:1000;height:60px;background:#fff;border-top:1px solid #eaeaea;display:grid;grid-template-columns:repeat(4,1fr);padding-bottom:env(safe-area-inset-bottom)}.bottom-nav a{display:flex;flex-direction:column;align-items:center;justify-content:center;color:#777;font-size:19px;line-height:1.2}.bottom-nav small{font-size:12px}.site-footer{padding-bottom:85px}.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:700px){.wrap{width:calc(100% - 32px)}.page h1{font-size:26px}.page{padding-top:24px}.lead{font-size:15px}.section{margin-top:28px}.section h2{font-size:21px}.hero-split,.article-split,.feature-pair,.grid-2{grid-template-columns:1fr}.hero-split .media{max-height:195px}.grid-3,.topic-strip{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.card{padding:13px}.card h3{font-size:16px}.media-portrait,.media-device{max-height:260px}.article-body h2{font-size:21px}.article-body h3{font-size:18px}}@media(max-width:350px){.topbar{gap:6px}.brand strong{font-size:19px}.brand img{max-width:85px}.main-btn{padding:0 10px;min-width:72px}.topic-strip{grid-template-columns:1fr}}