/* 山东鸿盛教学设备 - 前台样式（蓝色简约大气 / 响应式） */
:root{
  /* 配色取自《山东鸿儒2024产品图册》：沉稳蓝灰为主色，浅蓝为辅助，米金为点缀 */
  --blue-900:#1e2c44; --blue-800:#2a3d5c; --blue-700:#344f76; --blue-600:#3f6ba3;
  --blue-500:#528bcf; --blue-300:#97bae1; --blue-100:#d6e4f4; --blue-50:#eef3f9;
  --gold:#c0a068; --gold-soft:#f6ead2; --wine:#7a2e22;
  --ink:#22303f; --ink-2:#41505f; --muted:#6a7480; --line:#e2e7ef; --bg:#fff; --soft:#f5f8fb;
  --radius:10px; --shadow:0 6px 24px rgba(42,61,92,.10); --shadow-lg:0 18px 48px rgba(42,61,92,.18);
  --max:1200px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font:15px/1.75 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{margin:0 0 .6em;line-height:1.35;font-weight:700;color:var(--blue-900)}
h1{font-size:30px}h2{font-size:26px}h3{font-size:19px}h4{font-size:16px}
p{margin:0 0 1em}
ul{margin:0;padding:0;list-style:none}
.container{width:100%;max-width:var(--max);margin:0 auto;padding:0 20px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:11px 22px;border-radius:6px;background:var(--blue-700);color:#fff;font-size:15px;border:1px solid var(--blue-700);cursor:pointer;transition:.2s}
.btn:hover{background:var(--blue-800);border-color:var(--blue-800);transform:translateY(-1px);box-shadow:var(--shadow)}
.btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.6)}
.btn-ghost:hover{background:rgba(255,255,255,.14)}
.btn-outline{background:#fff;color:var(--blue-700);border-color:var(--blue-300)}
.btn-outline:hover{background:var(--blue-50);color:var(--blue-800)}
.btn-sm{padding:7px 14px;font-size:13px}

/* ---------- Header ---------- */
.site-header{position:sticky;top:0;z-index:60;background:#fff;box-shadow:0 1px 0 var(--line)}
.topbar{background:var(--blue-900);color:#d6e4f4;font-size:13px}
.topbar-inner{display:flex;align-items:center;justify-content:space-between;height:38px;gap:16px}
.topbar-text{opacity:.9;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.topbar-right{display:flex;align-items:center;gap:16px;flex:none}
.topbar-phone{display:inline-flex;align-items:center;gap:6px;color:#fff;font-weight:600}
.lang-switch a{opacity:.7}
.lang-switch a.active,.lang-switch a:hover{opacity:1;font-weight:700}
.lang-switch i{margin:0 4px;opacity:.4;font-style:normal}
.nav-wrap{background:#fff}
.nav-inner{display:flex;align-items:center;gap:24px;height:74px}
.logo{display:flex;align-items:center;gap:12px;flex:none}
.logo img{height:44px;width:auto;object-fit:contain}
.logo-mark{width:44px;height:44px;border-radius:8px;background:linear-gradient(135deg,var(--blue-600),var(--blue-800));color:#fff;display:grid;place-items:center;font-weight:800;letter-spacing:.5px}
.logo-text{display:flex;flex-direction:column;line-height:1.25}
.logo-text strong{font-size:17px;color:var(--blue-900)}
.logo-text em{font-size:12px;font-style:normal;color:var(--muted)}
.main-nav{margin-left:auto}
.main-nav>ul{display:flex;align-items:center;gap:4px}
.main-nav>ul>li{position:relative}
.main-nav a{display:block;padding:26px 14px;font-size:15px;color:var(--ink-2);font-weight:500;white-space:nowrap}
.main-nav>ul>li>a:hover,.main-nav>ul>li.active>a{color:var(--blue-700)}
.main-nav>ul>li.active>a::after{content:"";position:absolute;left:14px;right:14px;bottom:18px;height:2px;background:var(--blue-600);border-radius:2px}
.caret{display:inline-block;width:0;height:0;margin-left:5px;vertical-align:middle;border:4px solid transparent;border-top-color:currentColor}
.sub-menu{position:absolute;left:0;top:100%;min-width:180px;background:#fff;border:1px solid var(--line);border-top:2px solid var(--blue-600);border-radius:0 0 8px 8px;box-shadow:var(--shadow);opacity:0;visibility:hidden;transform:translateY(6px);transition:.18s}
.main-nav li.has-sub:hover .sub-menu{opacity:1;visibility:visible;transform:none}
.sub-menu a{padding:10px 16px;font-size:14px}
.sub-menu a:hover{background:var(--blue-50);color:var(--blue-700)}
.nav-toggle{display:none;margin-left:auto;width:40px;height:40px;border:1px solid var(--line);border-radius:6px;background:#fff;flex-direction:column;justify-content:center;align-items:center;gap:5px;cursor:pointer}
.nav-toggle span{display:block;width:18px;height:2px;background:var(--blue-800);transition:.2s}
.nav-toggle.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.is-open span:nth-child(2){opacity:0}
.nav-toggle.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ---------- Hero ---------- */
.hero{position:relative;background:linear-gradient(120deg,#1e2c44 0%,#344f76 55%,#528bcf 100%);color:#fff;overflow:hidden}
.hero::after{content:"";position:absolute;inset:0;background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cpath d='M0 120 L120 0' stroke='rgba(255,255,255,.07)' stroke-width='1'/%3E%3C/svg%3E")}
.hero-inner{position:relative;z-index:1;display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center;padding:48px 0 54px}
.hero-badge{display:inline-block;padding:6px 14px;border:1px solid rgba(255,255,255,.35);border-radius:99px;font-size:13px;margin-bottom:18px}
.hero h1{color:#fff;font-size:40px;line-height:1.25;margin-bottom:14px}
.hero p{color:rgba(255,255,255,.85);font-size:16px;max-width:560px}
.hero-actions{display:flex;gap:12px;margin-top:26px;flex-wrap:wrap}
.hero-stats{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:36px;max-width:520px}
.hero-stat{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.18);border-radius:var(--radius);padding:14px 16px}
.hero-stat b{display:block;font-size:24px;color:#fff}
.hero-stat span{font-size:13px;color:rgba(255,255,255,.85)}
.hero-figure{border-radius:14px;overflow:hidden;box-shadow:var(--shadow-lg);background:rgba(255,255,255,.1)}
.hero-figure img{width:100%;height:340px;object-fit:cover}

/* ---------- Section ---------- */
.section{padding:64px 0}
.section-soft{background:var(--soft)}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:32px}
.section-head h2{margin:0;position:relative;padding-bottom:12px}
.section-head h2::after{content:"";position:absolute;left:0;bottom:0;width:46px;height:3px;background:var(--gold);border-radius:2px}
.section-head p{color:var(--muted);margin:8px 0 0;font-size:14px}
.section-head .more{color:var(--blue-700);font-size:14px;white-space:nowrap}
.eyebrow{display:inline-block;font-size:13px;letter-spacing:2px;text-transform:uppercase;color:var(--gold);font-weight:700;margin-bottom:8px}

/* ---------- Cards ---------- */
.grid{display:grid;gap:22px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.22s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:var(--blue-100)}
.card-media{position:relative;height:196px;background:var(--blue-50);overflow:hidden}
.card-media img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.card:hover .card-media img{transform:scale(1.05)}
.card-media .ph{display:grid;place-items:center;height:100%;color:var(--blue-300);font-size:40px;font-weight:800}
.card-body{padding:16px 18px 20px}
.card-body h3{font-size:16px;margin-bottom:6px}
.card-body h3 a:hover{color:var(--blue-600)}
.card-meta{color:var(--muted);font-size:13px;display:flex;gap:12px;flex-wrap:wrap}
.card-desc{color:var(--muted);font-size:14px;margin:8px 0 0;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.badge-new{position:absolute;left:12px;top:12px;background:var(--blue-700);color:#fff;font-size:12px;padding:3px 10px;border-radius:99px}

/* ---------- Categories ---------- */
.cat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}

/* 应用详情：工程案例图集 */
.case-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.case-item{display:block;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);background:#fff;transition:box-shadow .2s,transform .2s}
.case-item img{display:block;width:100%;height:100%;object-fit:cover;aspect-ratio:4/3}
.case-item:hover{box-shadow:var(--shadow);transform:translateY(-2px)}
@media(min-width:721px){.case-grid{grid-template-columns:repeat(3,1fr)}}
.cat-card{position:relative;display:flex;flex-direction:column;justify-content:flex-end;min-height:170px;padding:20px;border-radius:var(--radius);overflow:hidden;color:#fff;background:linear-gradient(140deg,var(--blue-700),var(--blue-900))}
.cat-card:hover{box-shadow:var(--shadow-lg)}
.cat-card img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.35}
.cat-card .cat-inner{position:relative;z-index:1}
.cat-card h3{color:#fff;margin:0 0 6px;font-size:18px}
.cat-card p{margin:0;font-size:13px;color:rgba(255,255,255,.85);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.cat-subs{margin-top:10px;display:flex;flex-wrap:wrap;gap:8px}
.cat-subs a{font-size:12px;background:rgba(255,255,255,.16);padding:3px 10px;border-radius:99px}
.cat-subs a:hover{background:rgba(255,255,255,.32)}

/* ---------- Strengths ---------- */
.strength-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.strength{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px}
.strength .num{width:40px;height:40px;border-radius:10px;background:var(--blue-50);color:var(--blue-700);display:grid;place-items:center;font-weight:800;margin-bottom:12px}
.strength h3{font-size:16px;margin-bottom:6px}
.strength p{margin:0;color:var(--muted);font-size:14px}

/* ---------- Breadcrumb ---------- */
.breadcrumb{background:var(--soft);border-bottom:1px solid var(--line);font-size:13px;color:var(--muted)}
.breadcrumb .container{padding:14px 20px;display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.breadcrumb a{color:var(--muted)}
.breadcrumb a:hover{color:var(--blue-700)}
.breadcrumb .sep{opacity:.5}

/* ---------- Page head ---------- */
.page-head{background:linear-gradient(120deg,#2a3d5c,#528bcf);color:#fff;padding:46px 0 42px}
.page-head h1{color:#fff;margin-bottom:8px}
.page-head p{margin:0;color:rgba(255,255,255,.85);max-width:760px}

/* ---------- Product layout ---------- */
.layout-side{display:grid;grid-template-columns:260px 1fr;gap:32px;padding:40px 0 60px;align-items:start}
.side-box{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:16px;margin-bottom:18px}
.side-box h3{font-size:15px;padding-bottom:10px;border-bottom:1px solid var(--line);margin-bottom:10px}

/* ---------- 侧栏多级分类树（蓝色 banner + ⊕/⊖ 折叠） ---------- */
.cat-tree{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;margin-bottom:18px}
.cat-tree-head{position:relative;padding:30px 22px 26px;background:linear-gradient(135deg,var(--blue-800) 0%,var(--blue-600) 70%,var(--blue-500) 100%);color:#fff;overflow:hidden}
.cat-tree-head::before{content:"";position:absolute;inset:0;background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='260' height='120'%3E%3Cg fill='none' stroke='rgba(255,255,255,.16)' stroke-width='2'%3E%3Crect x='18' y='58' width='70' height='46'/%3E%3Crect x='96' y='58' width='70' height='46'/%3E%3Crect x='174' y='58' width='60' height='46'/%3E%3Cpath d='M12 58l121-32 122 32'/%3E%3C/g%3E%3C/svg%3E") center/cover;opacity:.5}
.cat-tree-head strong{position:relative;display:block;font-size:26px;font-weight:800;letter-spacing:3px;line-height:1.3}
.cat-tree-head span{position:relative;display:block;font-size:13px;letter-spacing:1.5px;color:rgba(255,255,255,.85)}
.cat-tree-body{padding:4px 0 10px}
.ct-level{list-style:none;margin:0;padding:0}
/* 行 */
.ct-row{display:flex;align-items:center;gap:10px;min-height:52px;padding:0 16px;border-bottom:1px solid var(--line)}
.ct-level-0>.ct-item:last-child>.ct-row,.ct-item:last-child>.ct-row{border-bottom-color:transparent}
.ct-item.has-sub>.ct-row{cursor:pointer}
/* 折叠按钮：蓝圈 + / − */
.ct-toggle{width:20px;height:20px;flex:none;position:relative;border:1px solid var(--blue-600);border-radius:50%;background:#fff;cursor:pointer;padding:0;transition:.2s}
.ct-toggle .ct-ico::before,.ct-toggle .ct-ico::after{content:"";position:absolute;left:50%;top:50%;background:var(--blue-600);transform:translate(-50%,-50%);transition:.15s}
.ct-toggle .ct-ico::before{width:10px;height:2px}
.ct-toggle .ct-ico::after{width:2px;height:10px}
.ct-item.open>.ct-row .ct-toggle .ct-ico::after{opacity:0}   /* 展开后显示 − */
.ct-toggle:hover{background:var(--blue-50)}
.ct-toggle-none{border-color:transparent;background:transparent}
.ct-toggle-none .ct-ico::before,.ct-toggle-none .ct-ico::after{display:none}
.ct-toggle-none:hover{background:transparent}
/* 链接 */
.ct-link{flex:1;font-size:15px;font-weight:600;color:var(--ink);line-height:1.4;padding:13px 0;transition:.15s}
.ct-row:hover .ct-link{color:var(--blue-600)}
.ct-item.open>.ct-row .ct-link,.ct-item.active>.ct-row .ct-link{color:var(--blue-600)}
/* 子级容器：默认折叠 */
.ct-level-1,.ct-level-2,.ct-level-3{display:none;padding:0 0 6px}
.ct-item.open>.ct-level-1,.ct-item.open>.ct-level-2,.ct-item.open>.ct-level-3{display:block}
/* 子级行：缩进；叶子行右侧 › 箭头 */
.ct-level-1 .ct-row{min-height:46px;padding-left:34px;border-bottom:1px solid var(--line)}
.ct-level-2 .ct-row{min-height:44px;padding-left:50px}
.ct-level-3 .ct-row{min-height:44px;padding-left:66px}
.ct-level-1 .ct-link,.ct-level-2 .ct-link,.ct-level-3 .ct-link{font-weight:400;font-size:14px;color:var(--ink-2);padding:11px 0}
.ct-level-1 .ct-item:not(.has-sub)>.ct-row{padding-left:34px}
.ct-level-2 .ct-item:not(.has-sub)>.ct-row{padding-left:50px}
.ct-level-3 .ct-item:not(.has-sub)>.ct-row{padding-left:66px}
.ct-level-1 .ct-item:not(.has-sub)>.ct-row::after,
.ct-level-2 .ct-item:not(.has-sub)>.ct-row::after,
.ct-level-3 .ct-item:not(.has-sub)>.ct-row::after{content:"";flex:none;width:7px;height:7px;margin-right:4px;border-right:2px solid #b9c6d6;border-top:2px solid #b9c6d6;transform:rotate(45deg);transition:.15s}
.ct-level-1 .ct-item:not(.has-sub)>.ct-row:hover::after,
.ct-level-2 .ct-item:not(.has-sub)>.ct-row:hover::after,
.ct-level-3 .ct-item:not(.has-sub)>.ct-row:hover::after{border-color:var(--blue-600)}
.ct-level-1 .ct-item.active>.ct-row .ct-link,.ct-level-2 .ct-item.active>.ct-row .ct-link,.ct-level-3 .ct-item.active>.ct-row .ct-link{color:var(--blue-600);font-weight:600}
.ct-level-1 .ct-item.active:not(.has-sub)>.ct-row::after,
.ct-level-2 .ct-item.active:not(.has-sub)>.ct-row::after,
.ct-level-3 .ct-item.active:not(.has-sub)>.ct-row::after{border-color:var(--blue-600)}
.filter-bar{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin-bottom:20px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:14px}
.filter-bar input[type=search],.filter-bar input[type=text],.filter-bar select{height:38px;border:1px solid var(--line);border-radius:6px;padding:0 12px;font-size:14px;color:var(--ink);background:#fff}
.filter-bar input[type=search]{flex:1;min-width:180px}
.filter-bar .count{margin-left:auto;color:var(--muted);font-size:13px}

/* 手机端分类九宫格（参考竞品：3 列小方块，仅移动端显示） */
.cat-chips{display:none}
.result-empty{padding:60px 0;text-align:center;color:var(--muted)}

/* ---------- Detail ---------- */
.detail{display:grid;grid-template-columns:1.05fr .95fr;gap:40px;padding:36px 0 60px;align-items:start}
.gallery{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff}
.gallery-main{height:380px;background:var(--blue-50);display:grid;place-items:center}
.gallery-main img{width:100%;height:100%;object-fit:cover}
.gallery-thumbs{display:flex;gap:10px;padding:12px;overflow-x:auto}
.gallery-thumbs img{width:76px;height:62px;object-fit:cover;border:1px solid var(--line);border-radius:6px;cursor:pointer}
.gallery-thumbs img.is-active{border-color:var(--blue-600);box-shadow:0 0 0 2px var(--blue-100)}
.detail-info h1{font-size:26px}
.detail-tags{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}
.tag{font-size:12px;background:var(--blue-50);color:var(--blue-700);padding:4px 10px;border-radius:99px}
.spec-list{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin:18px 0;background:var(--soft);border:1px solid var(--line);border-radius:var(--radius);padding:16px}
.spec-list div{font-size:14px;color:var(--ink-2)}
.spec-list span{color:var(--muted);margin-right:6px}
.detail-actions{display:flex;gap:12px;margin-top:22px;flex-wrap:wrap}
.content-block{margin-top:26px}
.content-block h2{font-size:20px;padding-bottom:10px;border-bottom:2px solid var(--blue-600);display:inline-block;margin-bottom:14px}
.params-text{white-space:pre-wrap;background:var(--soft);border:1px solid var(--line);border-radius:var(--radius);padding:18px;font-size:14px;line-height:1.9;color:var(--ink-2)}
.rich-content{font-size:15px;line-height:1.9;color:var(--ink-2)}
.rich-content img{max-width:100%;height:auto;border-radius:8px;margin:10px 0}
.rich-content ul{padding-left:20px;list-style:disc}
.rich-content ol{padding-left:20px;list-style:decimal}
.rich-content table{width:100%;border-collapse:collapse;margin:12px 0}
.rich-content th,.rich-content td{border:1px solid var(--line);padding:8px 10px;font-size:14px}

/* ---------- Spec table ---------- */
.spec-wrap{padding:36px 0 60px}
.spec-toolbar{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:16px;margin-bottom:20px;display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.spec-toolbar select,.spec-toolbar input{height:38px;border:1px solid var(--line);border-radius:6px;padding:0 12px}
.spec-group{margin-bottom:26px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.spec-group>h3{margin:0;padding:14px 18px;background:var(--blue-50);color:var(--blue-800);font-size:16px;border-bottom:1px solid var(--line)}
.table-scroll{overflow-x:auto}
.spec-table{width:100%;border-collapse:collapse;font-size:14px;min-width:900px}
.spec-table th,.spec-table td{border:1px solid var(--line);padding:10px 12px;vertical-align:top;text-align:left}
.spec-table thead th{background:var(--blue-700);color:#fff;font-weight:600;white-space:nowrap;position:sticky;top:0}
.spec-table tbody tr:nth-child(even){background:#fafcfe}
.spec-table td.params{color:var(--ink-2);line-height:1.7;max-width:420px}
.spec-table img{width:64px;height:52px;object-fit:cover;border-radius:6px;border:1px solid var(--line)}
.spec-tip{background:var(--blue-50);border:1px solid var(--blue-100);color:var(--blue-800);border-radius:var(--radius);padding:12px 16px;font-size:14px}

/* ---------- News ---------- */
.news-list{display:grid;gap:18px}
.news-item{display:grid;grid-template-columns:220px 1fr;gap:20px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.2s}
.news-item:hover{box-shadow:var(--shadow);border-color:var(--blue-100)}
.news-thumb{height:150px;background:var(--blue-50)}
.news-thumb img{width:100%;height:100%;object-fit:cover}
.news-body{padding:18px 20px}
.news-body h3{font-size:17px;margin-bottom:8px}
.news-meta{font-size:13px;color:var(--muted);display:flex;gap:16px;margin-bottom:8px}
.news-sum{color:var(--muted);font-size:14px;margin:0}
.article{padding:36px 0 60px;max-width:900px;margin:0 auto}
.article-head{text-align:center;margin-bottom:26px}
.article-head h1{font-size:28px}
.article-meta{color:var(--muted);font-size:13px;display:flex;gap:18px;justify-content:center}
.article-nav{display:flex;justify-content:space-between;gap:16px;border-top:1px solid var(--line);margin-top:36px;padding-top:18px;font-size:14px;color:var(--muted)}

/* ---------- About ---------- */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;padding:56px 0}
.about-img{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);background:var(--blue-50);min-height:280px}
.about-img img{width:100%;height:100%;object-fit:cover}
.timeline{position:relative;padding-left:26px}
.timeline::before{content:"";position:absolute;left:6px;top:6px;bottom:6px;width:2px;background:var(--blue-100)}
.timeline li{position:relative;padding-bottom:18px}
.timeline li::before{content:"";position:absolute;left:-25px;top:7px;width:10px;height:10px;border-radius:50%;background:var(--blue-600);box-shadow:0 0 0 3px var(--blue-100)}
.timeline b{color:var(--blue-800);margin-right:10px}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px}
.step span{display:inline-block;width:26px;height:26px;line-height:26px;text-align:center;border-radius:50%;background:var(--blue-700);color:#fff;font-size:13px;margin-bottom:10px}

/* ---------- Contact ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:36px;padding:40px 0 60px;align-items:start}
.info-list li{display:flex;gap:12px;padding:12px 0;border-bottom:1px dashed var(--line);font-size:15px}
.info-list .k{color:var(--muted);min-width:72px}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px}
.form-grid .full{grid-column:1/-1}
.form-grid label{display:block;font-size:13px;color:var(--ink-2);margin-bottom:6px}
.form-grid input,.form-grid textarea,.form-grid select{width:100%;border:1px solid var(--line);border-radius:6px;padding:10px 12px;font:inherit;color:var(--ink);background:#fff}
.form-grid input:focus,.form-grid textarea:focus{outline:none;border-color:var(--blue-500);box-shadow:0 0 0 3px var(--blue-50)}
.form-note{font-size:12px;color:var(--muted)}
.flash{padding:12px 16px;border-radius:6px;margin-bottom:16px;font-size:14px}
.flash.ok{background:#eaf7ee;border:1px solid #b7e2c4;color:#1c7a3a}
.flash.err{background:#fdeeee;border:1px solid #f5c6c6;color:#a83a3a}
.map-box{margin-top:18px;background:var(--soft);border:1px solid var(--line);border-radius:var(--radius);min-height:200px;overflow:hidden}

/* ---------- CTA ---------- */
.cta{background:linear-gradient(120deg,#2a3d5c,#528bcf);color:#fff;padding:52px 0;text-align:center}
.cta h2{color:#fff}
.cta p{color:rgba(255,255,255,.85);max-width:640px;margin:0 auto 22px}

/* ---------- Pagination ---------- */
.pagination{display:flex;gap:8px;justify-content:center;padding:28px 0 0;flex-wrap:wrap}
.page-link{min-width:36px;height:36px;display:grid;place-items:center;border:1px solid var(--line);border-radius:6px;background:#fff;color:var(--ink-2);font-size:14px}
.page-link:hover{border-color:var(--blue-500);color:var(--blue-700)}
.page-link.is-active{background:var(--blue-700);border-color:var(--blue-700);color:#fff}

/* ---------- Footer ---------- */
.site-footer{background:#16233a;color:#b9c6d8;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1.2fr;gap:32px;padding:46px 20px 30px}
.site-footer h4{color:#fff;font-size:16px;margin-bottom:14px}
.site-footer p{color:#b9c6d8;font-size:14px;margin-bottom:8px}
.footer-links li{margin-bottom:8px}
.footer-links a{color:#b9c6d8;font-size:14px}
.footer-links a:hover{color:#fff;text-decoration:underline}
.footer-line{font-size:13px;opacity:.85}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);font-size:13px;color:#93a3b8}
.footer-bottom .container{display:flex;gap:10px;justify-content:center;align-items:center;flex-wrap:wrap;padding:14px 20px}
.footer-bottom .footer-tip a{color:#93a3b8}
.footer-bottom .sep-dot{opacity:.45}
.back-top{position:fixed;right:22px;bottom:26px;width:42px;height:42px;border-radius:50%;background:var(--blue-700);color:#fff;display:grid;place-items:center;box-shadow:var(--shadow);opacity:0;pointer-events:none;transition:.2s;z-index:50}
.back-top.show{opacity:1;pointer-events:auto}

/* ---------- Responsive ---------- */
@media (max-width:1080px){
  .hero-inner{grid-template-columns:1fr;padding:56px 0 60px}
  .hero-figure{display:none}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .strength-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:900px){
  .nav-toggle{display:flex}
  .main-nav{position:fixed;inset:74px 0 auto;max-height:0;overflow:hidden;background:#fff;box-shadow:var(--shadow);transition:max-height .25s ease}
  .main-nav.open{max-height:calc(100vh - 74px);overflow-y:auto}
  .main-nav>ul{flex-direction:column;align-items:stretch;gap:0;padding:8px 0}
  .main-nav a{padding:14px 20px;border-bottom:1px solid var(--line)}
  .main-nav>ul>li.active>a::after{display:none}
  .sub-menu{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;border:none;border-radius:0;padding-left:14px;background:var(--soft)}
  .layout-side{grid-template-columns:1fr}
  /* 手机端分类树默认折叠，点击标题展开，避免占用过多屏幕空间 */
  .cat-tree{margin-bottom:14px}
  .cat-tree-head{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:13px 16px;cursor:pointer}
  .cat-tree-head strong{font-size:16px;letter-spacing:1px;line-height:1.4}
  .cat-tree-head span{display:none}
  .cat-tree-head::after{content:"";position:relative;width:8px;height:8px;border-right:2px solid rgba(255,255,255,.9);border-bottom:2px solid rgba(255,255,255,.9);transform:rotate(45deg);transition:transform .2s;flex:none;margin-top:-4px}
  .cat-tree.open .cat-tree-head::after{transform:rotate(-135deg)}
  .cat-tree-body{display:none;padding:2px 0 8px}
  .cat-tree.open .cat-tree-body{display:block}
  .detail{grid-template-columns:1fr;gap:26px}
  .contact-grid,.about-grid{grid-template-columns:1fr}
  .cat-grid{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:1fr}
  .news-item{grid-template-columns:1fr}
  .news-thumb{height:180px}
}
@media (max-width:640px){
  .container{padding:0 14px}
  .topbar-text{display:none}
  .hero h1{font-size:28px}
  .section{padding:44px 0}
  .grid-3,.grid-2,.grid-4,.cat-grid,.strength-grid{grid-template-columns:1fr}
  .spec-list{grid-template-columns:1fr}
  .form-grid{grid-template-columns:1fr}
  /* 手机端页脚：只保留精简内容，PC 专属内容隐藏 */
  .pc-only{display:none!important}
  .footer-grid{grid-template-columns:1fr 1fr;gap:18px 16px;padding:22px 16px 14px}
  .footer-about{grid-column:1/-1}
  .footer-about h4{margin-bottom:0}
  .site-footer h4{font-size:14px;margin-bottom:10px}
  .site-footer p{font-size:13px;margin-bottom:5px}
  .footer-about p{font-size:13px}
  .footer-about .footer-line{margin-bottom:0}
  .footer-links{display:grid;grid-template-columns:repeat(auto-fill,minmax(106px,1fr));gap:0 12px}
  .footer-links li{margin-bottom:6px}
  .footer-links a{font-size:13px}
  .footer-contact p{margin-bottom:4px}
  .footer-bottom{border-top-color:rgba(255,255,255,.1)}
  .footer-bottom .container{padding:10px 14px;font-size:12px;line-height:1.6}
  .page-head{padding:32px 0 30px}
  /* 手机端：隐藏左侧分类树与筛选栏分类下拉，改用紧凑九宫格 */
  .prod-side{display:none}
  .filter-bar select{display:none}
  .cat-chips{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:14px}
  .cat-chip{display:flex;align-items:center;justify-content:center;min-height:44px;padding:8px 6px;border:1.5px solid var(--blue-300);border-radius:6px;background:#fff;color:var(--blue-800);font-size:14px;font-weight:600;text-align:center;line-height:1.3}
  .cat-chip.is-active{background:var(--blue-700);border-color:var(--blue-700);color:#fff;font-weight:600}
  .cat-chip-sub{min-height:38px;padding:6px 8px;font-size:13px;color:var(--blue-800);background:var(--blue-100);border:1px solid var(--blue-300);font-weight:500}
  .cat-chip-sub2{min-height:34px;font-size:12px;padding:5px 6px;color:var(--muted);background:var(--soft);border:1px dashed var(--line);font-weight:400}
  .cat-chip-sub.is-active,.cat-chip-sub2.is-active{background:var(--blue-700);color:#fff}
  .ct-row{min-height:48px}
  .gallery-main{height:260px}
}