:root{--primary:#0f4c81;--accent:#2e8bff;--ink:#1f2d3d;--muted:#6b7a8d;--bg:#fff;--line:#e7eef5}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);line-height:1.6}
a{color:var(--primary);text-decoration:none}
img{max-width:100%;display:block}
.container{max-width:1160px;margin:0 auto;padding:0 20px}
.site-header{display:flex;align-items:center;justify-content:space-between;padding:18px 26px;background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.logo{display:flex;flex-direction:row;align-items:center;line-height:1.1}
.logo-img{height:58px;width:auto;object-fit:contain;flex-shrink:0}
.site-header nav a{margin-left:30px;font-size:18px;color:var(--ink)}
.site-header nav a.active,.site-header nav a:hover{color:var(--accent);font-weight:600}
main{min-height:60vh}
.hero .banner{min-height:380px;color:#fff;display:flex;align-items:center;padding:60px 20px;position:relative;overflow:hidden}
.hero .banner-video{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover;z-index:0;background:#0f4c81}
.banner-bgimg{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover;z-index:0;background:#0f4c81}
.hero .banner .inner{max-width:700px;margin:0 auto;text-align:center;position:relative;z-index:1;text-shadow:0 1px 8px rgba(0,0,0,.45)}
.hero h1{font-size:38px;margin-bottom:14px}
.hero p{font-size:18px;opacity:.95}
.btn{display:inline-block;margin-top:18px;padding:11px 26px;background:#fff;color:var(--primary);border-radius:6px;font-weight:600}
.section{padding:56px 20px;max-width:1160px;margin:0 auto}
.section h2{font-size:26px;margin-bottom:26px;text-align:center}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.card{background:#fff;border:1px solid var(--line);border-radius:10px;padding:18px;transition:.2s}
.card:hover{box-shadow:0 8px 24px rgba(15,76,129,.12);transform:translateY(-3px)}
.card .thumb{height:150px;border-radius:8px;margin-bottom:14px;overflow:hidden}
.thumb img{width:100%;height:100%;object-fit:cover;display:block}
.card h3{font-size:17px;margin-bottom:8px}
.card p{color:var(--muted);font-size:14px;margin-bottom:10px}
.card ul{list-style:none;padding:0;margin-top:10px}
.card ul li{font-size:13px;color:var(--ink);padding:3px 0;border-top:1px dashed var(--line)}
.date{color:var(--muted);font-size:13px}
.about-text{font-size:16px;max-width:820px;margin:0 auto 30px}
.contact-box{background:#f4f8fc;border-radius:10px;padding:24px;max-width:600px;margin:0 auto}
.contact-box h3{margin-bottom:12px}
.contact-box p{margin:6px 0}
.detail{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}
.detail .thumb{min-height:320px;border-radius:10px;overflow:hidden}
.params{list-style:none;margin:18px 0}
.params li{display:flex;justify-content:space-between;padding:10px 0;border-bottom:1px solid var(--line)}
.params span{color:var(--muted)}
.model-rule-box{margin:22px 0;border:1px solid #dde7f1;border-radius:10px;background:#f8fbfe;padding:16px 18px}
.model-rule-title{margin:0 0 6px;font-size:16px;color:var(--primary)}
.model-rule-model{font-size:22px;font-weight:700;letter-spacing:1px;color:var(--ink);margin-bottom:10px;font-family:Consolas,Menlo,monospace}
.model-rule-table{width:100%;border-collapse:collapse;font-size:13.5px}
.model-rule-table th{background:#eaf2fb;color:var(--primary);text-align:left;padding:7px 10px;border:1px solid #dbe6f2}
.model-rule-table td{padding:7px 10px;border:1px solid #dbe6f2;color:var(--ink)}
.model-rule-table td:first-child{white-space:nowrap}
@media(max-width:800px){.model-rule-model{font-size:17px}.model-rule-table th,.model-rule-table td{padding:6px 8px;font-size:12.5px}}
.features{display:flex;flex-wrap:wrap;gap:10px}
.features span{background:#eef4fb;color:var(--primary);padding:6px 14px;border-radius:20px;font-size:13px}
.card-links{margin-top:8px}
.card-clickable{cursor:pointer}
.thumb-link{display:block;text-decoration:none}
.card .thumb-link .thumb{transition:transform .25s ease, box-shadow .25s ease}
.card .thumb-link:hover .thumb{transform:translateY(-6px) scale(1.03);box-shadow:0 12px 26px rgba(15,76,129,.18)}
.card .thumb-link:hover img{transform:scale(1.04)}
.cat-tabs{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-bottom:26px}
.cat-tab{padding:8px 20px;border:1px solid #d5e0ec;background:#fff;border-radius:20px;font-size:14px;color:var(--ink);cursor:pointer;transition:.15s}
.cat-tab:hover{border-color:var(--accent);color:var(--accent)}
.cat-tab.active{background:var(--primary);color:#fff;border-color:var(--primary);font-weight:600}
.file-link{display:inline-block;margin-top:4px;padding:4px 12px;background:#eef4fb;color:var(--primary);border-radius:16px;font-size:13px}
.file-link:hover{background:#dfeaf7}
.detail-actions{margin-top:20px;display:flex;gap:12px;flex-wrap:wrap}
.detail-gallery-full{grid-column:1 / -1;margin-top:34px;min-width:0;width:100%}
.detail > *{min-width:0}
/* 页脚二维码 */
.footer-qr{display:flex;gap:16px;margin-top:14px}
.qr-item{text-align:center}
.qr-item img{width:92px;height:92px;object-fit:contain;border-radius:6px;background:#fff;padding:5px;display:block;box-sizing:border-box}
.qr-item span{display:block;font-size:12px;color:#cfe3d6;margin-top:5px}
.detail-actions .file-link{margin:0;padding:9px 18px;border:1px solid #d5e0ec;background:#fff;border-radius:6px}
.article{max-width:760px;margin:0 auto}
.article h1{font-size:28px;margin:14px 0}
.article #nd-body{font-size:16px;margin-top:20px}
/* ===== 案例详情页 ===== */
.back-link{display:inline-block;color:var(--primary);text-decoration:none;font-size:14px;margin-bottom:6px}
.case-head{display:flex;gap:22px;align-items:flex-start;margin:16px 0 8px}
.case-head .case-thumb{flex:0 0 220px;min-height:140px;background:#eef7f0;border-radius:8px;overflow:hidden;display:flex;align-items:center;justify-content:center}
.case-head .case-thumb img{width:100%;height:100%;object-fit:cover}
.case-meta{flex:1}
.case-meta h1{margin-top:0}
.case-customer{color:var(--primary);font-weight:600;margin-bottom:8px}
.case-overview{font-size:16px;color:var(--ink);line-height:1.7}
#case-detail h2{font-size:20px;margin:26px 0 10px;padding-left:12px;border-left:4px solid var(--primary)}
#case-detail p{line-height:1.8;margin:8px 0;font-size:15px}
.case-results{list-style:none;padding:0;margin:10px 0 0}
.case-results li{padding:10px 14px;margin-bottom:8px;background:#f2f8f4;border-left:4px solid #28a77a;border-radius:4px;font-size:15px}
/* 产品展示视频：铺满内容区宽度，位于拼接图片上方 */
.case-video{margin-bottom:8px}
.detail-video{display:block;width:100%;max-width:100%;aspect-ratio:16/9;object-fit:contain;border-radius:8px;background:#000}
/* 案例图集：多图上下无缝拼接，类似淘宝详情页 */
.case-gallery{margin-top:6px}
.gallery-title{font-size:20px;color:#1f5133;margin:34px 0 12px;padding-bottom:8px;border-bottom:2px solid #28a77a}
.case-gallery-item{margin:0;padding:0;line-height:0}
.case-gallery-item img{display:block;width:100%;height:auto;line-height:0}
.case-gallery-cap{margin:8px 0 0;padding:0 4px 14px;font-size:14px;color:#5b6b7b;text-align:center;line-height:1.6;background:#fff}
.case-gallery .hint{color:#9aa5b1;font-size:14px}
@media(max-width:600px){
  .case-head{flex-direction:column}
  .case-head .case-thumb{flex:none;width:100%;min-height:120px}
}
.site-footer{background:#0f2a44;color:#cdddef;padding:44px 20px 20px;margin-top:50px}
.site-footer .cols{display:grid;grid-template-columns:1fr 1fr;max-width:1160px;margin:0 auto 24px}
.site-footer h4{color:#fff;margin-bottom:10px}
.copyright{text-align:center;border-top:1px solid rgba(255,255,255,.15);padding-top:16px;font-size:13px}
/* ===== 移动端适配（含汉堡菜单） ===== */
.nav-toggle{display:none;background:none;border:none;font-size:26px;line-height:1;color:var(--ink);cursor:pointer;padding:4px 8px}
@media(max-width:800px){
  .grid{grid-template-columns:1fr}
  .detail{grid-template-columns:1fr}
  .site-header{position:relative;flex-wrap:nowrap;padding:14px 16px}
  .logo-img{height:46px}
  .site-header nav a{padding:14px 20px;font-size:17px}
  .nav-toggle{display:block;font-size:20px}
  .site-header nav{display:none;flex-direction:column;width:100%;position:absolute;top:100%;left:0;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 10px 24px rgba(15,28,42,.08);z-index:60}
  .site-header nav a{margin:0;padding:13px 20px;font-size:16px;border-top:1px solid #f0f4f9;display:block}
  .site-header.nav-open nav{display:flex}
  .hero .banner{min-height:250px;padding:40px 16px}
  .hero h1{font-size:25px}
  .hero p{font-size:15px}
  .section{padding:34px 16px}
  .section h2{font-size:22px;margin-bottom:18px}
  .card .thumb{height:120px}
  .detail .thumb{min-height:200px}
  .site-footer .cols{grid-template-columns:1fr;gap:20px}
  .container{padding:0 14px}
  .logo-img{height:36px}
  .params li{font-size:14px}
  .detail-actions .file-link{flex:1;text-align:center}
  .cat-tabs{flex-wrap:nowrap;overflow-x:auto;justify-content:flex-start;padding-bottom:6px;-webkit-overflow-scrolling:touch}
  .cat-tab{flex-shrink:0}
}

/* ===== 访客注册弹窗（下载 CAD / 查看 PDF 前） ===== */
.qy-reg-mask{position:fixed;inset:0;background:rgba(15,28,42,.55);display:none;align-items:center;justify-content:center;z-index:9999;padding:16px}
.qy-reg-box{background:#fff;border-radius:12px;width:100%;max-width:400px;padding:26px 28px 24px;position:relative;box-shadow:0 12px 40px rgba(0,0,0,.18)}
.qy-reg-close{position:absolute;top:12px;right:14px;border:none;background:none;font-size:22px;line-height:1;color:#9aa5b1;cursor:pointer}
.qy-reg-close:hover{color:#334}
.qy-reg-box h3{margin:0 0 6px;font-size:18px;color:#14263c}
.qy-reg-tip{margin:0 0 16px;font-size:13px;color:#667}
.qy-reg-box label{display:block;margin-bottom:12px;font-size:13px;color:#445;font-weight:600}
.qy-reg-box input{display:block;width:100%;box-sizing:border-box;margin-top:5px;padding:9px 11px;border:1px solid #d5dde6;border-radius:6px;font-size:14px;color:#223;outline:none}
.qy-reg-box input:focus{border-color:#2e8bff}
.qy-reg-err{margin:0 0 10px;font-size:13px;color:#d93025;min-height:16px}
.qy-reg-submit{width:100%;padding:11px;border:none;border-radius:6px;background:#0f4c81;color:#fff;font-size:15px;cursor:pointer}
.qy-reg-submit:hover{background:#123f6b}
.qy-reg-submit:disabled{opacity:.6;cursor:not-allowed}

/* 中英语言切换按钮 */
.lang-switch{background:#fff;border:1px solid #1f3a5f;color:#1f3a5f;font-size:15px;padding:6px 16px;border-radius:6px;cursor:pointer;margin-right:10px;white-space:nowrap;font-weight:600;line-height:1.4}
.lang-switch:hover{background:#eef4fb;border-color:#0f4c81;color:#0f4c81}
.site-header.nav-open .lang-switch{display:none}
@media (max-width:860px){.lang-switch{margin-right:6px;font-size:12px;padding:3px 10px}}