:root{--ink:#203640;--muted:#647780;--green:#13876d;--light-green:#e8f5ef;--navy:#183b4c;--tint:#f5f8f9;--border:#e3eaec;--shadow:0 16px 44px rgba(24,59,76,.07)}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;color:var(--ink);background:#fff;font-family:"PingFang SC","Microsoft YaHei",system-ui,sans-serif;font-size:15px;line-height:1.75;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button{font:inherit;cursor:pointer}button,a{-webkit-tap-highlight-color:transparent}a:focus-visible,button:focus-visible,[tabindex]:focus-visible{outline:3px solid #20b798;outline-offset:5px}img{display:block;max-width:100%;height:auto}h1,h2,h3,h4,p{margin:0}h1,h2{font-size:28px;line-height:1.5;letter-spacing:.02em;font-weight:650}h3{font-size:18px;line-height:1.7;font-weight:600}h4{font-size:16px;font-weight:600}ul{margin:0;padding:0;list-style:none}[hidden]{display:none!important}.container{width:min(1120px,calc(100% - 80px));margin:auto}.section{padding:62px 0}.tint{background:var(--tint)}.section-heading{text-align:center;margin-bottom:36px}.section-heading h1:after,.section-heading h2:after{content:"";display:block;width:32px;height:3px;background:var(--green);border-radius:3px;margin:16px auto 0}.section-heading p{font-size:16px;color:var(--muted);margin-top:15px}.icon-library{position:absolute;width:0;height:0;overflow:hidden}.icon{width:24px;height:24px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}.skip-link{position:fixed;top:-80px;left:20px;z-index:30;padding:10px 20px;background:white;color:var(--green)}.skip-link:focus{top:12px}
/* 品牌首屏：沿用品牌介绍、导航与多端连接的原有结构。 */
.hero{position:relative;overflow:hidden;background:radial-gradient(ellipse at 80% 90%,#28647266,transparent 54%),linear-gradient(118deg,#183b4c,#1b344a 70%,#24445c);color:white;padding-bottom:38px}.header{display:flex;align-items:center;justify-content:space-between;padding:28px 0 26px;gap:30px}.brand{font-size:36px;font-weight:750;line-height:1.4;letter-spacing:.015em;white-space:nowrap;display:flex;align-items:center;gap:10px}.brand-dot{width:8px;height:8px;border-radius:50%;background:#66d8ab;align-self:flex-end;margin-bottom:11px}.header nav{display:flex;gap:7px;align-items:center}.header nav a{font-size:14px;padding:9px 16px;border-radius:7px;color:#e6eff2;transition:background .2s,color .2s}.header nav a:hover{background:#ffffff12;color:#8fe6c9}.header nav a:last-child{border:1px solid #ffffff3b;background:#ffffff08;margin-left:5px}.hero-intro{font-size:14px;line-height:1.95;color:#c6d7e0;text-align:justify;max-width:1100px;position:relative;z-index:1}.hero-art{height:195px;position:relative;margin:2px auto 0;width:92%}.connection{position:absolute;bottom:0;left:0;width:100%;height:155px}.orbit{position:absolute;left:50%;top:60%;border:1px solid #ffffff06;border-radius:50%;transform:translate(-50%,-50%);width:350px;height:350px}.orbit-two{width:470px;height:470px}.hero-node{position:absolute;width:56px;height:56px;display:grid;place-items:center;background:linear-gradient(145deg,#3c8495,#22566e);border:1px solid #7adfc951;border-radius:18px;box-shadow:0 8px 36px #09233155,0 0 0 9px #ffffff03;transform:rotate(-7deg)}.hero-node .icon{width:28px;height:28px;color:#b4efde;transform:rotate(7deg)}.node-pc{left:19%;top:76px}.node-phone{left:47%;top:31px}.node-book{left:78%;top:84px}.hero-wave{position:absolute;bottom:-1px;left:0;width:100%;height:32px}.menu-toggle{display:none}
/* 平台能力与两列课程展示。 */
.platform{padding:42px 0 48px}.platform .section-heading{margin-bottom:30px}.services{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:13px}.services>div{padding:20px 8px;background:#f7faf9;border:1px solid #edf2ef;border-radius:10px;display:flex;flex-direction:column;align-items:center;gap:12px;text-align:center;color:#405a60;font-size:14px;transition:transform .2s,border-color .2s}.services>div:hover{transform:translateY(-3px);border-color:#bdded0}.services .icon{color:var(--green);width:27px;height:27px}.two-column{display:grid;grid-template-columns:1fr 1fr;gap:66px;align-items:center}.service-layout{gap:75px}.service-copy h3{font-size:19px;line-height:1.9;margin-bottom:25px}.benefit-list{display:grid;gap:14px}.benefit-list li{display:flex;align-items:flex-start;gap:12px;font-size:15px}.benefit-list .icon{width:21px;height:21px;color:var(--green);background:#e5f2eb;border-radius:50%;padding:3px;margin-top:3px}.monitor-wrap{position:relative;max-width:460px;width:100%;margin:8px auto 0;filter:drop-shadow(0 16px 15px #2036400c)}.monitor{border-radius:14px;background:#20343d;padding:12px 12px 0;position:relative}.monitor:before{content:"";position:absolute;top:5px;left:50%;width:3px;height:3px;background:#4b5d65;border-radius:50%}.monitor-screen{background:#f4f7f8;border-radius:4px 4px 0 0;overflow:hidden;aspect-ratio:1.73}.monitor-chin{height:29px;background:linear-gradient(#e3e9eb,#d5dfe2);margin:0 -12px;border-radius:0 0 12px 12px;display:grid;place-items:center}.monitor-chin span{height:6px;width:6px;border-radius:50%;background:#a4b5bc}.monitor-stand{width:66px;height:44px;background:linear-gradient(100deg,#cbd8dd,#edf2f3,#bccdd4);margin:auto;clip-path:polygon(25% 0,75% 0,100% 100%,0 100%)}.monitor-base{height:7px;width:130px;background:#c2d1d7;border-radius:50%;margin:auto}.screen-top{display:flex;align-items:center;gap:5px;background:white;padding:7px 14px;border-bottom:1px solid #e4ecec;height:33px}.screen-top span{font-size:12px;color:var(--green);font-weight:650;margin-right:auto}.screen-top i{height:4px;width:13px;background:#cadbd7;border-radius:2px}.screen-content{display:flex;height:calc(100% - 33px)}.screen-side{width:19%;background:#eaf1f0;padding:18px 12px}.screen-side span{display:block;height:5px;border-radius:2px;background:#c6d8d4;margin-bottom:16px}.screen-side span:first-child{background:#38987e}.screen-main{padding:17px;width:81%}.screen-banner{background:linear-gradient(105deg,#c8e7dc,#e1efe9);height:78px;padding:18px;display:flex;align-items:center;gap:12px;border-radius:5px;color:#25785f}.screen-banner .icon{width:32px;height:32px}.screen-banner strong{font-size:14px}.screen-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:13px}.screen-cards>div{background:#fff;border:1px solid #e8efed;padding:10px;border-radius:4px;color:#4c9584}.screen-cards>div:nth-child(2){color:#758dae}.screen-cards>div:nth-child(3){color:#c3a05e}.screen-lines{margin-top:13px;display:grid;gap:5px}.screen-lines i{height:4px;background:#dce6e5;width:85%;border-radius:2px}.screen-lines i:last-child{width:54%}.course-intro{margin-bottom:23px;font-size:17px}.course-list{border:1px solid var(--border);border-radius:12px;overflow:hidden;box-shadow:0 4px 20px #183b4c03}.course-list li{display:flex;align-items:center;gap:15px;padding:12px 20px;font-size:15px}.course-list li+li{border-top:1px solid #eef2f1}.course-list .icon{background:var(--light-green);color:var(--green);border-radius:8px;padding:7px;width:34px;height:34px}.course-monitor .monitor-screen{background:#e6f3f5}.road-scene{height:calc(100% - 60px);position:relative;background:linear-gradient(#bedfe6,#eaf4f5);overflow:hidden}.sun{position:absolute;right:35px;top:16px;width:24px;height:24px;background:#fff5cc;border-radius:50%}.skyline{position:absolute;display:flex;gap:7px;align-items:flex-end;right:30px;left:25px;bottom:37px;height:75px}.skyline i{flex:1;height:70%;background:#aecad1;border-radius:2px 2px 0 0}.skyline i:nth-child(2){height:100%;background:#9ebfc9}.skyline i:nth-child(3){height:50%}.skyline i:nth-child(4){height:85%;background:#9ebfc9}.skyline i:nth-child(5){height:60%}.road{height:42px;width:100%;position:absolute;bottom:0;background:#789ca5;border-top:8px solid #a0c4ab}.road span{position:absolute;left:0;right:0;top:18px;border-top:2px dashed #d4e3e5}.car{position:absolute;right:66px;bottom:24px;width:86px;height:25px;background:#258b72;border-radius:18px 18px 6px 6px}.car span{position:absolute;left:16px;top:-16px;width:53px;height:23px;border:5px solid #258b72;background:#daeeed;border-radius:15px 18px 0 0}.car i{position:absolute;bottom:-6px;left:13px;background:#25434b;width:14px;height:14px;border:3px solid #d1e0e0;border-radius:50%}.car i:last-child{left:auto;right:12px}.road-label{position:absolute;top:22px;left:25px;color:#335e6b;display:flex;gap:10px;align-items:center;font-size:16px}.video-controls{display:flex;align-items:center;gap:9px;height:27px;background:#2b414b;padding:0 11px}.video-controls span{width:5px;height:7px;border-left:2px solid #a8babc;border-right:2px solid #a8babc}.video-controls i{height:3px;background:linear-gradient(to right,#61b39a 36%,#677c83 36%);width:100%;border-radius:3px}.video-controls .icon{width:13px;height:13px;color:#a8babc}
/* 多端、资讯、优势、合作。 */
.terminal-layout{grid-template-columns:.95fr 1.15fr;gap:48px}.terminals h3{font-size:17px;margin-bottom:22px}.terminal-features{display:grid;gap:22px}.terminal-features>div{display:flex;gap:14px;align-items:flex-start}.icon-box{width:48px;height:48px;flex-shrink:0;border-radius:12px;display:grid;place-items:center;color:var(--green);background:var(--light-green)}.terminal-features h4{margin-bottom:4px}.terminal-features p{font-size:14px;line-height:1.8;color:var(--muted)}.devices-wrap{background:#fff;border:1px solid #e9eff1;padding:26px 18px;border-radius:15px;box-shadow:var(--shadow)}.devices-wrap img{width:100%}.news{padding-bottom:32px}.news-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}.news-card{display:flex;align-items:center;gap:16px;padding:20px 14px;border:1px solid var(--border);border-radius:12px;transition:box-shadow .2s,transform .2s}.news-card:hover{box-shadow:var(--shadow);transform:translateY(-3px)}.news-cover{flex-shrink:0;width:64px;padding:7px;background:#fbf5e9;border-radius:5px}.news-cover img{width:100%}.news-card h3{font-size:16px}.news-card p{font-size:11px;color:var(--muted);margin:4px 0 8px;white-space:nowrap}.price{font-size:24px;line-height:1;color:#d16b4c;font-weight:600;font-variant-numeric:tabular-nums}.price span{font-size:12px;font-weight:400;margin-left:3px}.advantages{padding-top:38px}.tabs{display:flex;width:fit-content;max-width:100%;padding:5px;background:#edf3f1;border:1px solid #e3ece7;border-radius:10px;margin:0 auto 29px}.tabs button{border:0;color:var(--muted);background:transparent;border-radius:7px;padding:10px 36px;font-size:14px;transition:background .2s,color .2s}.tabs button[aria-selected="true"]{background:var(--green);color:white;box-shadow:0 4px 10px #13876d20}.tabs button:hover:not([aria-selected="true"]){background:#e1ece6}.advantage-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}.advantage-grid article{padding:27px 23px 26px;border:1px solid var(--border);border-radius:12px;background:#fff}.advantage-grid .icon-box{margin-bottom:20px}.advantage-grid article:nth-child(2) .icon-box{background:#eaf0f9;color:#5c7eaa}.advantage-grid article:nth-child(3) .icon-box{background:#fcf3e5;color:#b29055}.advantage-grid article:nth-child(4) .icon-box{background:#eaf2f5;color:#5a8e9d}.advantage-grid h3{font-size:16px;margin-bottom:11px;min-height:28px}.advantage-grid p{font-size:13px;line-height:1.9;color:var(--muted)}.partner-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}.partner-grid article{padding:30px 31px;background:white;border:1px solid #e7eeef;border-radius:14px;box-shadow:0 10px 30px #183b4c04}.partner-image{height:109px;display:flex;align-items:center;justify-content:center;margin-bottom:17px}.partner-image img{height:100px;width:auto;max-width:140px;object-fit:contain}.partner-grid h3{font-size:18px;text-align:center;margin-bottom:16px}.partner-grid p{font-size:14px;color:var(--muted);line-height:1.95;text-align:justify}.contact{display:flex;gap:6px;justify-content:center;align-items:center;margin-top:33px;font-size:14px;color:var(--muted)}.contact a{color:var(--green);display:inline-flex;align-items:center;gap:10px}.contact a:hover{text-decoration:underline}.contact .icon{width:17px;height:17px}footer{padding:25px 0;background:var(--navy);font-size:12px;color:#b5c7cf}footer .container{display:flex;align-items:center;justify-content:center;gap:16px;flex-wrap:wrap}footer a:hover{color:#fff}
/* 平板尺寸：保留双列说明，卡片改为双列。 */
@media(min-width:1440px){.container{width:min(1180px,calc(100% - 120px))}.hero-art{height:205px}.section{padding-top:70px;padding-bottom:70px}.platform{padding:46px 0 50px}.news{padding-bottom:30px}.advantages{padding-top:40px}}
@media(max-width:1050px){.container{width:calc(100% - 56px)}.header{gap:20px}.brand{font-size:31px}.header nav{gap:0}.header nav a{padding:9px 10px;font-size:13px}.two-column{gap:32px}.terminal-layout{gap:30px}.news-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.news-card{padding:20px;gap:20px}.news-cover{width:70px}.news-card p{font-size:13px}.advantage-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.advantage-grid article{padding:25px}.partner-grid{gap:16px}.partner-grid article{padding:25px 21px}.partner-grid h3{font-size:16px}.services{gap:9px}.services>div{font-size:12px}.screen-main{padding:13px}.screen-banner{height:64px;padding:13px}.screen-cards{margin-top:8px}.screen-cards>div{padding:6px}.screen-lines{margin-top:8px}.road-label{font-size:14px;top:13px;left:16px}.road-label .icon{width:20px;height:20px}.skyline{height:60px}.section{padding:50px 0}.news{padding-bottom:25px}.advantages{padding-top:30px}}
/* 手机尺寸：垂直排版、触控导航，文字与内容全部保留。 */
@media(max-width:700px){.container{width:calc(100% - 40px)}.section{padding:42px 0}.hero{padding-bottom:27px}.header{padding:23px 0 21px;position:relative}.brand{font-size:30px}.brand-dot{margin-bottom:9px;width:7px;height:7px}.menu-toggle{width:44px;height:44px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;border:1px solid #ffffff2a;border-radius:8px;background:#ffffff06;color:#fff}.menu-toggle span{display:block;height:2px;width:19px;background:currentColor;border-radius:2px;transition:transform .2s,opacity .2s}.menu-toggle[aria-expanded="true"] span:first-child{transform:translateY(7px) rotate(45deg)}.menu-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}.menu-toggle[aria-expanded="true"] span:last-child{transform:translateY(-7px) rotate(-45deg)}.header nav{display:none;position:absolute;top:80px;left:0;right:0;z-index:10;background:#254858;border:1px solid #547584;border-radius:12px;box-shadow:0 10px 35px #10252e66;padding:8px}.header nav.is-open{display:grid;grid-template-columns:1fr}.header nav a{padding:12px 17px;font-size:15px}.header nav a:last-child{border:0;margin:0;background:transparent}.hero-intro{font-size:13px;line-height:1.95}.hero-art{height:145px;width:100%;margin-top:13px}.connection{height:116px}.hero-node{width:44px;height:44px;border-radius:13px}.hero-node .icon{width:24px;height:24px}.node-pc{top:51px;left:14%}.node-phone{top:15px;left:46%}.node-book{top:65px;left:80%}.hero-wave{height:22px}.orbit{width:220px;height:220px}.orbit-two{width:300px;height:300px}h1,h2{font-size:23px;line-height:1.5}.section-heading{margin-bottom:28px}.section-heading p{font-size:14px;line-height:1.8;margin-top:14px}.platform{padding:32px 0 36px}.platform h1{max-width:290px;margin:auto}.services{grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.services>div{padding:16px 6px;font-size:12px;gap:10px}.services .icon{width:24px;height:24px}.two-column{grid-template-columns:1fr;gap:30px}.monitor-wrap{max-width:420px}.service-copy h3{font-size:17px;margin-bottom:21px}.benefit-list{gap:14px}.benefit-list li{font-size:14px}.course-intro{font-size:16px;margin-bottom:19px}.course-list li{padding:10px 16px;font-size:14px;gap:12px}.course-list .icon{width:32px;height:32px}.course-layout{gap:33px}.course-monitor{margin-top:0}.terminal-layout{gap:28px}.terminals h3{font-size:16px;margin-bottom:24px}.terminal-features{gap:22px}.terminal-features p{font-size:13px}.terminal-features h4{font-size:15px}.icon-box{width:43px;height:43px;border-radius:10px}.devices-wrap{padding:22px 14px;border-radius:12px}.news{padding-bottom:20px}.news-grid{gap:12px}.news-card{padding:15px 12px;display:flex;flex-direction:column;align-items:flex-start;gap:12px}.news-cover{width:61px}.news-card h3{font-size:15px}.news-card p{font-size:11px;white-space:normal;margin-bottom:10px}.price{font-size:23px}.advantages{padding-top:23px}.tabs{width:100%;padding:4px;margin-bottom:22px}.tabs button{flex:1;padding:10px 3px;font-size:13px}.advantage-grid{gap:12px}.advantage-grid article{padding:20px 16px}.advantage-grid .icon-box{margin-bottom:17px}.advantage-grid h3{font-size:15px;line-height:1.6;min-height:24px}.advantage-grid p{font-size:12px;line-height:1.9}.partner-grid{grid-template-columns:1fr;gap:16px}.partner-grid article{padding:27px 24px}.partner-image{height:91px;margin-bottom:15px}.partner-image img{height:88px}.partner-grid h3{font-size:18px;margin-bottom:13px}.partner-grid p{font-size:14px}.contact{flex-direction:column;gap:2px;margin-top:28px;font-size:13px}.contact a{gap:7px}footer{padding:23px 0;font-size:11px;line-height:1.8}footer .container{display:block;text-align:center}footer span,footer a{display:block}footer a{margin-top:4px}}
@media(max-width:360px){.container{width:calc(100% - 32px)}h1,h2{font-size:21px}.services>div{font-size:11px}.advantage-grid{grid-template-columns:1fr}.news-card{padding:13px 10px}.news-card p{font-size:10px}.hero-intro{font-size:12px}.screen-banner{height:57px;font-size:12px}.screen-banner strong{font-size:12px}.screen-cards>div{padding:4px}.screen-cards .icon{width:20px;height:20px}.screen-lines{margin-top:7px}.road-label{font-size:13px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}