*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:#252B3A;background:#fff;font:16px/1.8 Arial,"PingFang SC","Microsoft YaHei",sans-serif}a{color:#315CFF;text-decoration:none}a:hover{text-decoration:underline}button{font:inherit;cursor:pointer}img{max-width:100%}.container{width:min(100% - 48px,1160px);margin-inline:auto}h1,h2,h3{color:#17213A;line-height:1.4;margin:0 0 16px}h1{font-size:38px}h2{font-size:25px}h3{font-size:19px}p{margin:0 0 16px}.site-header{position:sticky;top:0;z-index:1000;background:rgba(255,255,255,.96);border-bottom:1px solid #e7ebf5;backdrop-filter:blur(8px)}.header-inner{height:70px;display:flex;align-items:center;gap:24px}.brand{display:inline-flex;align-items:center;min-width:112px;white-space:nowrap;color:#315CFF;font-size:21px;font-weight:800;text-decoration:none}.brand .logo-media{max-width:142px;height:38px}.brand-fallback{display:none}.brand .media-placeholder{display:none}.brand:has(.media-placeholder) .brand-fallback{display:inline}.logo-media{display:flex;align-items:center;max-width:142px;max-height:40px}.logo-media img{display:block;width:auto;height:auto;max-width:100%;max-height:38px;object-fit:contain}.main-nav{flex:1;display:flex;align-items:center;justify-content:center;gap:clamp(12px,2vw,30px);white-space:nowrap}.main-nav a{color:#252B3A;font-size:14px;font-weight:600;position:relative}.main-nav a.active{color:#315CFF}.main-nav a.active:after{content:"";height:2px;background:#315CFF;position:absolute;bottom:-22px;left:0;right:0}.main-btn{display:inline-flex;align-items:center;justify-content:center;min-width:80px;height:40px;padding:0 18px;border-radius:999px;background:#315CFF;color:#fff;font-weight:700;text-decoration:none;white-space:nowrap}.main-btn:hover{background:#2549db;color:#fff;text-decoration:none}.subnav{background:#F5F7FB;border-bottom:1px solid #edf0f6}.subnav-inner{display:flex;align-items:center;gap:0;overflow-x:auto;white-space:nowrap;scrollbar-width:thin}.subnav a{flex:0 0 auto;color:#5F6B82;padding:9px 19px;font-size:13px;position:relative}.subnav a:not(:last-child):after{position:absolute;content:"";width:1px;height:12px;right:0;top:50%;transform:translateY(-50%);background:#d6dce7}.subnav a.active{color:#315CFF}.main-content{padding:24px 0 48px}.site-section{margin:36px 0 44px}.eyebrow{color:#315CFF;letter-spacing:1px;font-weight:700;font-size:12px}.lead{font-size:17px;line-height:1.85;color:#4b5a72}.section-top{display:flex;align-items:baseline;gap:20px;margin-bottom:18px}.section-top h2{margin:0}.section-top p{font-size:14px;color:#758198;margin:0}.media{display:flex;align-items:center;justify-content:center;width:100%;max-width:100%;min-width:0;overflow:hidden;border-radius:12px;background:#EEF4FF}.media img{display:block;width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain;object-position:center}.media-natural img{display:block;width:100%;height:auto;max-height:280px;object-fit:contain;margin:0 auto}.media-wide{aspect-ratio:16/9}.media-banner{height:min(27vw,320px)}.media-square{aspect-ratio:1/1}.media-device{height:310px}.media-placeholder{width:100%;height:100%;min-height:90px;background:linear-gradient(145deg,#EEF4FF,#e4edff)}.hero-carousel{position:relative;overflow:hidden;background:#EEF4FF;border-radius:14px;height:clamp(155px,26vw,320px)}.slide{display:none;width:100%;height:100%}.slide.is-active{display:block}.slide .media{height:100%;border-radius:0}.slide img{height:100%;width:100%;object-fit:contain}.slide-prev,.slide-next{position:absolute;top:50%;transform:translateY(-50%);border:0;border-radius:50%;width:38px;height:38px;color:#17213A;background:rgba(255,255,255,.88);font-size:29px;line-height:1;display:flex;align-items:center;justify-content:center}.slide-prev{left:12px}.slide-next{right:12px}.slide-dots{position:absolute;bottom:13px;left:0;right:0;display:flex;justify-content:center;gap:8px}.slide-dots button{width:9px;height:9px;border-radius:50%;padding:0;border:0;background:#c6d4f4}.slide-dots button.active{background:#315CFF}.intro-grid{display:grid;grid-template-columns:3fr 2fr;gap:40px;align-items:center}.intro-grid .lead{margin-bottom:0}.quick-links{background:#F5F7FB;padding:23px;border-radius:14px}.quick-links h2,.page-sidebar h2{font-size:20px}.quick-links a,.page-sidebar a,.feature-split a:not(.media a),.content-panel a{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #e6eaf2;padding:9px 0;font-size:14px}.quick-links a span{color:#8A95AA}.direction-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:17px}.direction,.category-card{display:block;border:1px solid rgba(49,92,255,.14);border-radius:13px;padding:23px;background:#fff;color:#252B3A;transition:box-shadow .18s,transform .18s;text-decoration:none}.direction:hover,.category-card:hover{box-shadow:0 8px 26px rgba(49,92,255,.1);transform:translateY(-2px);text-decoration:none}.direction h3,.category-card h3{margin:5px 0 9px}.direction p,.category-card p{font-size:14px;color:#5F6B82;margin:0 0 10px}.direction-num,.category-index{font-size:13px;color:#315CFF;font-weight:700}.card-more{color:#315CFF;font-size:13px;font-weight:700}.feature-split{display:grid;grid-template-columns:1fr 1fr;gap:32px;align-items:center}.feature-split>div{min-width:0}.feature-split h3{font-size:23px}.feature-split p{color:#526078}.feature-split a{color:#315CFF}.image-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.image-tile{margin:0;padding:12px;border:1px solid #e8edf7;border-radius:13px;min-width:0;background:#fff}.image-tile .media{height:170px;aspect-ratio:auto}.image-tile figcaption{padding:10px 3px 3px}.image-tile figcaption strong{display:block;font-size:15px;color:#17213A}.image-tile figcaption span{font-size:13px;color:#68758c;line-height:1.65;display:block}.section-note{margin-top:15px;color:#68758c;font-size:14px}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:18px}.content-panel,.knowledge-panel{background:#F5F7FB;border-radius:14px;padding:26px}.knowledge-panel{border-left:3px solid #315CFF}.number-list{margin:0;padding:0;list-style:none;counter-reset:read}.number-list li{counter-increment:read;border-bottom:1px solid #e7ebf5}.number-list li a{display:flex;gap:15px;padding:14px 2px;color:#252B3A;align-items:center}.number-list li a:before{content:counter(read,decimal-leading-zero);color:#315CFF;font-size:14px;font-weight:700}.number-list strong{min-width:150px}.number-list span{font-size:14px;color:#68758c}.notice{background:#EEF4FF;border-left:3px solid #315CFF;border-radius:7px;padding:18px 22px;margin:30px 0;line-height:1.9;font-size:14px}.page-layout{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:38px;align-items:start;margin-top:15px}.prose{max-width:810px}.article-head{margin-bottom:28px;padding-bottom:22px;border-bottom:1px solid #e6eaf2}.article-head h1{font-size:32px;margin:7px 0 15px}.reading-section{margin-bottom:29px}.reading-section h2{font-size:23px;margin:0 0 12px}.reading-section p{line-height:1.86}.article-image{max-width:550px;margin:0 0 26px}.page-sidebar{position:sticky;top:120px;border:1px solid #edf0f6;border-radius:13px;padding:18px;background:#fff}.page-sidebar a{color:#5F6B82}.related{padding-top:22px;border-top:1px solid #edf0f6}.related-links{display:flex;gap:12px;flex-wrap:wrap}.related-links a{border:1px solid #dce4f5;padding:7px 13px;border-radius:30px;font-size:14px}.category-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:28px 0}.site-footer{background:#101828;color:#D8E0F2;padding:40px 0 20px}.footer-grid{display:grid;grid-template-columns:1.7fr repeat(3,1fr);gap:35px}.footer-brand a{display:flex;align-items:center;color:#fff;gap:10px}.footer-brand a strong{font-size:20px}.footer-brand p{font-size:14px;margin-top:15px;color:#c7d2e4}.footer-col h2{color:#fff;font-size:16px}.footer-col a{display:block;color:#D8E0F2;font-size:14px;margin:8px 0}.footer-bottom{margin-top:30px;border-top:1px solid #304057;padding-top:16px;display:flex;align-items:start;justify-content:space-between;gap:20px;color:#c5cfe1;font-size:12px}.footer-bottom p{max-width:790px}.menu-toggle,.mobile-drawer,.drawer-mask,.bottom-nav{display:none}a:focus-visible,button:focus-visible{outline:3px solid #6B8DFF;outline-offset:3px}@media(max-width:980px){.container{width:calc(100% - 40px)}.header-inner{height:58px;justify-content:space-between;gap:10px}.main-nav{display:none}.menu-toggle{display:flex;flex-direction:column;justify-content:center;gap:5px;background:none;border:0;padding:9px;width:39px;height:40px}.menu-toggle span{display:block;height:2px;width:21px;background:#17213A}.brand{min-width:0;justify-content:center;font-size:18px}.brand .logo-media{max-height:30px;max-width:112px}.logo-media img{max-height:30px}.main-btn{height:36px;min-width:67px;padding:0 12px;font-size:14px}.subnav a{padding:9px 14px}.mobile-drawer{display:block;position:fixed;inset:0 auto 0 0;width:min(84vw,320px);height:100dvh;overflow-y:auto;background:#fff;z-index:12000;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(16,24,40,.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-head{display:flex;justify-content:space-between;align-items:center;padding:15px 18px;border-bottom:1px solid #edf0f6}.drawer-close{border:0;background:none;font-size:28px;color:#17213A}.drawer-group{padding:13px 18px;border-bottom:1px solid #eef1f7}.drawer-group h3{font-size:14px;color:#315CFF;margin:4px 0 8px}.drawer-group a{display:block;color:#252B3A;padding:7px 4px;min-height:40px;font-size:14px}.drawer-group a.active{color:#315CFF;font-weight:700}.bottom-nav{display:grid;grid-template-columns:repeat(4,1fr);position:fixed;bottom:0;left:0;right:0;background:#fff;z-index:950;border-top:1px solid #e5eaf5;height:60px;padding-bottom:env(safe-area-inset-bottom)}.bottom-nav a{display:flex;justify-content:center;align-items:center;color:#5F6B82;font-size:14px}.bottom-nav a.active{color:#315CFF;font-weight:700}.site-footer{padding-bottom:74px}.page-layout{grid-template-columns:minmax(0,1fr)}.page-sidebar{position:static;display:none}.direction-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:700px){.container{width:calc(100% - 32px)}body{font-size:15px}.main-content{padding:16px 0 28px}h1{font-size:28px}h2{font-size:21px}.article-head h1{font-size:26px}.reading-section h2{font-size:21px}.lead{font-size:15px}.site-section{margin:27px 0 32px}.section-top{display:block}.section-top h2{margin-bottom:4px}.intro-grid,.feature-split,.two-col{grid-template-columns:1fr;gap:16px}.intro-grid .quick-links{margin-top:0}.image-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:11px}.image-tile{padding:8px}.image-tile .media{height:140px}.direction-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:11px}.direction,.category-card{padding:15px}.direction h3{font-size:17px}.direction p{font-size:13px}.hero-carousel{height:clamp(145px,43vw,200px)}.media-banner{height:100%}.media-device{height:250px}.mobile-feature>div:first-child{order:2}.mobile-feature>div:last-child{order:1}.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.footer-brand{grid-column:span 2}.footer-bottom{display:block}.number-list li a{display:block;position:relative;padding-left:40px}.number-list li a:before{position:absolute;left:0;top:14px}.number-list strong{display:block}.number-list span{display:block}.content-panel,.knowledge-panel{padding:18px}.category-grid{grid-template-columns:1fr}.article-head{margin-bottom:22px}.page-layout{margin-top:0}}@media(max-width:360px){.brand{font-size:16px}.brand .logo-media{max-width:100px}.direction-grid{grid-template-columns:1fr}.image-grid{grid-template-columns:1fr}.image-tile .media{height:145px}.main-btn{min-width:59px}.hero-carousel{height:145px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition-duration:.01ms!important;animation-duration:.01ms!important}}