:root{--blue:#0b5cd5;--navy:#0b2545;--ink:#1f2a37;--muted:#5b6675;--line:#e5e9f0;--bg:#f6f8fb;--green:#25d366}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,"Segoe UI",Roboto,Arial,sans-serif;color:var(--ink);background:#fff;line-height:1.6}
a{color:inherit;text-decoration:none}img{max-width:100%;display:block}.wrap{max-width:1200px;margin:0 auto;padding:0 24px}
/* 顶部联系条 */
.topbar{background:var(--navy);color:#c9d4e3;font-size:13px}.topbar .wrap{display:flex;gap:22px;align-items:center;height:36px}.topbar a:hover{color:#fff}.topbar .r{margin-left:auto;display:flex;gap:18px}
/* 主导航 */
header{position:sticky;top:0;z-index:40;background:#fff;box-shadow:0 1px 0 var(--line),0 6px 18px rgba(11,37,69,.04)}
.nav{display:flex;align-items:center;height:76px;gap:24px}.nav .logo img{height:38px}
.menu-links{display:flex;align-items:stretch;gap:6px;margin:0 auto;height:76px}
.menu-links>a,.menu-links>.mega>a{display:flex;align-items:center;padding:0 18px;font-size:15.5px;font-weight:600;color:var(--navy);position:relative;letter-spacing:.2px}
.menu-links>a:after,.menu-links>.mega>a:after{content:"";position:absolute;left:18px;right:18px;bottom:0;height:3px;border-radius:3px 3px 0 0;background:var(--blue);transform:scaleX(0);transition:transform .2s}
.menu-links>a:hover:after,.menu-links>a.on:after,.menu-links>.mega:hover>a:after,.menu-links>.mega>a.on:after{transform:scaleX(1)}.menu-links>a.on,.menu-links>.mega>a.on{color:var(--blue)}
.mega{display:flex;align-items:stretch}
.mega>a .caret{margin-left:6px;font-size:10px;opacity:.6}
.mega-panel{display:none;position:absolute;left:0;right:0;top:76px;background:#fff;border-top:1px solid var(--line);box-shadow:0 22px 40px rgba(11,37,69,.12)}
.mega:hover .mega-panel,.mega:focus-within .mega-panel{display:block}
.mega-panel .wrap{display:grid;grid-template-columns:repeat(5,1fr);gap:26px;padding-top:26px;padding-bottom:30px}
.mega-panel h4{margin:0 0 10px;font-size:15px;color:var(--navy)}.mega-panel h4 a:hover{color:var(--blue)}
.mega-panel ul{list-style:none;margin:0;padding:0}.mega-panel li a{display:block;padding:5px 0;color:var(--muted);font-size:14px}.mega-panel li a:hover{color:var(--blue)}
.mega-panel .thumb{display:block;border:1px solid var(--line);border-radius:10px;padding:8px;margin-bottom:10px;background:#fff;aspect-ratio:4/3}.mega-panel .thumb img{width:100%;height:100%;object-fit:contain}
.btn{display:inline-flex;align-items:center;gap:8px;height:44px;padding:0 22px;border-radius:8px;font-weight:600;font-size:15px;border:1px solid transparent;cursor:pointer;white-space:nowrap}
.btn-primary{background:var(--blue);color:#fff}.btn-primary:hover{background:#0a4fb6}.btn-ghost{border-color:#cdd6e3;color:var(--navy);background:#fff}.btn-ghost:hover{border-color:var(--blue);color:var(--blue)}.btn-wa{background:var(--green);color:#fff}
.burger{display:none;margin-left:auto;background:none;border:0;font-size:26px;color:var(--navy);cursor:pointer}
/* 页面 */
.hero{background:linear-gradient(135deg,#0b2545 0%,#0b5cd5 100%);color:#fff;padding:84px 0 110px}
.hero h1{font-size:44px;line-height:1.15;margin:0 0 18px;max-width:720px}.hero p{font-size:19px;opacity:.9;max-width:640px;margin:0 0 30px}
.hero .cta{display:flex;gap:12px;flex-wrap:wrap}.hero .btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.6)}
.badge{display:inline-block;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.35);padding:6px 14px;border-radius:999px;font-size:13px;font-weight:600;letter-spacing:.5px;margin-bottom:18px}
.page-head{background:var(--bg);border-bottom:1px solid var(--line);padding:38px 0 30px}.page-head h1{margin:0 0 6px;color:var(--navy);font-size:34px}.page-head p{margin:0;color:var(--muted);max-width:760px}
.crumb{font-size:14px;color:var(--muted);margin-bottom:10px}.crumb a{color:var(--blue)}
section{padding:64px 0}.sec-alt{background:var(--bg)}h2{font-size:30px;margin:0 0 10px;color:var(--navy)}.lead{color:var(--muted);margin:0 0 32px;font-size:17px}
.stats{display:grid;grid-template-columns:repeat(4,1fr);background:#fff;border:1px solid var(--line);border-radius:14px;margin-top:-50px;position:relative;box-shadow:0 14px 34px rgba(11,37,69,.08)}
.stats div{padding:24px 20px;text-align:center;border-right:1px solid var(--line)}.stats div:last-child{border-right:0}.stats b{display:block;font-size:30px;color:var(--blue)}.stats span{color:var(--muted);font-size:14px}
.tiles{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}.tile{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;transition:box-shadow .2s,transform .2s}.tile:hover{box-shadow:0 12px 30px rgba(11,37,69,.10);transform:translateY(-2px)}
.tile .img{aspect-ratio:1/1;padding:16px;display:flex;align-items:center;justify-content:center}.tile .img img{max-height:100%;object-fit:contain}.tile .t{padding:14px 16px;border-top:1px solid var(--line)}.tile b{display:block;color:var(--navy)}.tile span{color:var(--muted);font-size:13px}
.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.card{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;transition:box-shadow .2s,transform .2s;display:flex;flex-direction:column}.card:hover{box-shadow:0 12px 30px rgba(11,37,69,.10);transform:translateY(-2px)}
.card .img{aspect-ratio:1/1;background:#fff;display:flex;align-items:center;justify-content:center;padding:14px}.card .img img{max-height:100%;object-fit:contain}
.card .body{padding:14px 16px 18px;border-top:1px solid var(--line);flex:1;display:flex;flex-direction:column}.card h3{margin:0 0 2px;font-size:15px;color:var(--navy)}
.card .model{color:var(--blue);font-weight:600;font-size:13.5px}.card .desc{color:var(--muted);font-size:13.5px;margin:6px 0 12px;flex:1}
.subnav{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 28px}.subnav a{border:1px solid var(--line);background:#fff;border-radius:999px;padding:7px 14px;font-size:14px;color:var(--navy)}.subnav a:hover,.subnav a.on{border-color:var(--blue);color:var(--blue)}
.group-title{margin:42px 0 16px;font-size:22px;color:var(--navy);border-left:4px solid var(--blue);padding-left:12px}
.why{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}.why div{padding:22px;border-left:3px solid var(--blue);background:#fff;border-radius:6px}.why b{display:block;color:var(--navy);margin-bottom:4px}.why span{color:var(--muted);font-size:14px}
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;counter-reset:st}.steps div{background:#fff;border:1px solid var(--line);border-radius:12px;padding:22px}.steps div:before{counter-increment:st;content:counter(st);display:inline-flex;width:30px;height:30px;border-radius:50%;background:var(--blue);color:#fff;align-items:center;justify-content:center;font-weight:700;margin-bottom:10px}.steps b{display:block;color:var(--navy)}.steps span{color:var(--muted);font-size:14px}
.pkg{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}.pkg .card{padding:26px}.pkg h3{font-size:22px}.pkg ul{padding-left:18px;margin:12px 0 22px;flex:1}.pkg li{margin:5px 0}.pkg .tag{color:var(--muted);font-size:14px}
.pkg .feat{border:2px solid var(--blue);position:relative;overflow:visible}.pkg .feat:before{content:"Most popular";position:absolute;top:-12px;left:22px;background:var(--blue);color:#fff;font-size:12px;padding:2px 10px;border-radius:999px}
.detail{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:start;padding:30px 0 70px}.detail .img{border:1px solid var(--line);border-radius:14px;padding:24px;background:#fff}
.specs{white-space:pre-wrap;background:var(--bg);border-radius:10px;padding:18px;font-size:14px;max-height:520px;overflow:auto}
.contact{display:grid;grid-template-columns:1fr 1fr;gap:30px}.contact .item{display:flex;gap:14px;margin:0 0 18px}.contact .item b{display:block;color:var(--navy)}
form{display:grid;gap:12px}input,textarea{width:100%;padding:12px 14px;border:1px solid #cdd6e3;border-radius:8px;font:inherit}textarea{min-height:130px}
.note{background:#fff8e6;border:1px solid #f5d48a;color:#7a5600;padding:14px 16px;border-radius:10px;font-size:14px}
footer{background:var(--navy);color:#c9d4e3;padding:44px 0 26px;font-size:14px}footer .cols{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px}footer b{color:#fff;display:block;margin-bottom:10px}footer a:hover{color:#fff}
footer .copy{border-top:1px solid rgba(255,255,255,.12);margin-top:28px;padding-top:18px;color:#8fa1ba}
.side{position:fixed;right:0;top:50%;transform:translateY(-50%);z-index:30;display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);border-right:0;border-radius:12px 0 0 12px;box-shadow:0 10px 26px rgba(11,37,69,.12)}
.side a,.side button{display:flex;flex-direction:column;align-items:center;gap:3px;width:76px;padding:12px 4px;font-size:12px;color:var(--navy);background:#fff;border:0;border-bottom:1px solid var(--line);cursor:pointer;font-family:inherit}.side a:hover,.side button:hover{background:var(--bg);color:var(--blue)}.side span{font-size:20px}
.side .wc{position:relative}.side .wechat-pop{display:none;position:absolute;right:82px;top:50%;transform:translateY(-50%);background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px 16px;white-space:nowrap;box-shadow:0 10px 26px rgba(11,37,69,.12);font-size:14px}.side .wc:hover .wechat-pop{display:block}
.wa-float{position:fixed;right:18px;bottom:18px;z-index:30;width:56px;height:56px;border-radius:50%;background:var(--green);display:none;align-items:center;justify-content:center;box-shadow:0 8px 20px rgba(0,0,0,.2)}.wa-float svg{width:30px;height:30px;fill:#fff}
@media(max-width:1100px){.mega-panel .wrap{grid-template-columns:repeat(3,1fr)}.tiles{grid-template-columns:repeat(3,1fr)}}
@media(max-width:980px){
 .topbar .l{display:none}.menu-links{display:none;position:absolute;top:76px;left:0;right:0;height:auto;background:#fff;flex-direction:column;padding:8px 24px 18px;border-bottom:1px solid var(--line);max-height:calc(100vh - 112px);overflow:auto}
 .menu-links.open{display:flex}.menu-links>a,.menu-links>.mega>a{padding:12px 0;border-bottom:1px solid var(--line)}.menu-links>a:after,.menu-links>.mega>a:after{display:none}
 .mega-panel{display:block;position:static;box-shadow:none;border:0}.mega-panel .wrap{grid-template-columns:1fr 1fr;padding:10px 0 4px;gap:14px}.mega-panel .thumb{display:none}
 .burger{display:block}.nav .cta-btn{display:none}.side{display:none}.wa-float{display:flex}
 .grid,.why,.steps,.stats{grid-template-columns:1fr 1fr}.pkg,.detail,.contact,footer .cols{grid-template-columns:1fr}.stats div:nth-child(2){border-right:0}.hero h1{font-size:32px}}
@media(max-width:560px){.tiles{grid-template-columns:1fr 1fr}.hero{padding:56px 0 90px}.hero h1{font-size:27px}section{padding:46px 0}h2{font-size:24px}.page-head h1{font-size:27px}}