/* ============================================================
   同诺货架 TONGNUO RACKS — 工业风格多页网站
   共享样式表
   ============================================================ */

:root{
  --ink:#151B23;          /* 近黑钢色 */
  --ink-2:#1E2733;        /* 深钢蓝灰 */
  --steel:#2C3747;
  --steel-2:#39465A;
  --paper:#FFFFFF;
  --concrete:#F3F5F6;     /* 混凝土灰 */
  --concrete-2:#EAEDF0;
  --line:#D8DDE2;
  --orange:#F0761C;       /* 品牌橙 */
  --orange-dark:#C75E0B;
  --navy:#17314E;
  --text:#27303B;
  --muted:#6C7785;
  --warn:#F2B90A;        /* 警示黄 */
  --shadow:0 14px 40px rgba(20,28,40,.12);
}

*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  font-family:"Noto Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--text);background:var(--paper);line-height:1.7;
  font-size:16px;letter-spacing:.1px;-webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%;}
a{color:inherit;text-decoration:none;}
ul{list-style:none;}
.container{width:min(1200px,92vw);margin:0 auto;position:relative;}

/* 英文/数字展示字体 */
.en{font-family:"Oswald","Noto Sans SC",sans-serif;}

/* 警示斜纹（工业元素） */
.hazard{
  height:8px;background:
    repeating-linear-gradient(-45deg,var(--ink) 0,var(--ink) 10px,var(--warn) 10px,var(--warn) 20px);
}
.hazard-orange{
  height:6px;background:
    repeating-linear-gradient(-45deg,var(--ink) 0,var(--ink) 9px,var(--orange) 9px,var(--orange) 18px);
}
/* 钢架网格底纹 */
.grid-bg{
  background-image:
    linear-gradient(rgba(21,27,35,.06) 1px,transparent 1px),
    linear-gradient(90deg,rgba(21,27,35,.06) 1px,transparent 1px);
  background-size:44px 44px;
}

/* ============ 顶部工具条 ============ */
.topbar{background:var(--ink);color:#cfd6de;font-size:13px;}
.topbar .container{display:flex;justify-content:space-between;align-items:center;gap:16px;min-height:38px;}
.topbar a{color:#cfd6de;}
.topbar .tb-right{display:flex;gap:18px;align-items:center;}
.topbar .tb-phone{color:var(--orange);font-family:"Oswald";font-size:15px;letter-spacing:.5px;font-weight:600;}
.topbar svg{vertical-align:-2px;margin-right:4px;}

/* ============ 导航 ============ */
.header{position:sticky;top:0;z-index:100;background:var(--ink-2);border-bottom:3px solid var(--orange);}
.header .container{display:flex;align-items:center;gap:32px;min-height:74px;}
.logo{display:flex;align-items:center;gap:12px;flex-shrink:0;}
.logo .logo-img{height:46px;width:auto;background:#fff;padding:7px 13px;border-radius:8px;display:block;box-shadow:0 3px 12px rgba(0,0,0,.30);}

.logo-name{display:flex;flex-direction:column;line-height:1.18;}
.logo-name strong{font-size:17px;font-weight:800;color:#fff;letter-spacing:1px;white-space:nowrap;}
.logo-name small{font-family:"Oswald","Noto Sans SC",sans-serif;font-size:10.5px;letter-spacing:3px;color:var(--orange);text-transform:uppercase;}

.logo-mark{width:44px;height:44px;background:var(--orange);position:relative;flex-shrink:0;}
.logo-mark svg{position:absolute;inset:0;margin:auto;}
.logo-text{line-height:1.15;}
.logo-cn{font-size:21px;font-weight:900;color:#fff;letter-spacing:2px;}
.logo-en{font-family:"Oswald";font-size:11px;letter-spacing:4px;color:var(--orange);}
.nav{display:flex;gap:4px;margin-left:auto;}
.nav a{color:#e4e9ef;padding:26px 16px;font-size:15px;font-weight:500;position:relative;transition:.2s;}
.nav a::after{content:"";position:absolute;left:16px;right:16px;bottom:0;height:3px;background:var(--orange);transform:scaleX(0);transform-origin:left;transition:.25s;}
.nav a:hover::after,.nav a.active::after{transform:scaleX(1);}
.nav a:hover{color:#fff;}
.nav a.active{color:#fff;}
.header-cta{margin-left:8px;background:var(--orange);color:#fff;font-weight:700;padding:12px 20px;font-size:15px;display:flex;align-items:center;gap:8px;flex-shrink:0;transition:.2s;}
.header-cta:hover{background:var(--orange-dark);}
.nav-toggle{display:none;margin-left:auto;background:none;border:1px solid #46536a;color:#fff;width:46px;height:46px;cursor:pointer;flex-shrink:0;}

/* 移动端菜单 */
.mobile-menu{display:none;position:fixed;inset:0;background:rgba(13,17,23,.96);z-index:200;flex-direction:column;padding:24px;padding-top:90px;}
.mobile-menu.open{display:flex;}
.mobile-menu a{color:#e8edf3;font-size:21px;font-weight:600;padding:16px 8px;border-bottom:1px solid #2b3440;}
.mobile-menu .m-cta{margin-top:24px;background:var(--orange);color:#fff;text-align:center;padding:14px;font-weight:700;}
.mm-close{position:absolute;top:26px;right:24px;background:none;border:none;color:#fff;font-size:30px;cursor:pointer;}

/* ============ Hero ============ */
.hero{position:relative;min-height:78vh;display:flex;align-items:center;color:#fff;overflow:hidden;background:var(--ink);}
.hero-bg{position:absolute;inset:0;background-size:contain;background-position:center;opacity:.5;}
.hero-bg::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(21,27,35,.92) 0%,rgba(21,27,35,.55) 55%,rgba(21,27,35,.25) 100%);}
.hero .container{position:relative;z-index:2;padding:90px 0 100px;}
.hero-tag{display:inline-flex;align-items:center;gap:10px;background:rgba(240,118,28,.16);border:1px solid var(--orange);padding:7px 16px;font-size:13px;letter-spacing:2px;color:var(--orange);font-family:"Oswald";}
.hero-tag::before{content:"";width:22px;height:2px;background:var(--orange);}
.hero h1{font-size:clamp(34px,6vw,62px);font-weight:900;line-height:1.12;margin:26px 0 20px;letter-spacing:1px;}
.hero h1 .accent{color:var(--orange);}
.hero-sub{font-size:clamp(16px,2.2vw,20px);color:#d4dbe3;max-width:640px;font-weight:300;}
.hero-stats{display:flex;gap:0;margin-top:44px;border-top:1px solid rgba(255,255,255,.18);}
.hstat{padding:22px 28px 8px 0;margin-right:34px;}
.hstat b{display:block;font-family:"Oswald";font-size:40px;font-weight:700;color:#fff;line-height:1;}
.hstat b em{font-style:normal;color:var(--orange);}
.hstat span{color:#aeb7c2;font-size:13px;letter-spacing:1px;}
.hero-cta{display:flex;gap:16px;margin-top:40px;flex-wrap:wrap;}
.btn{display:inline-flex;align-items:center;gap:10px;padding:14px 26px;font-weight:700;font-size:15px;transition:.2s;cursor:pointer;border:none;}
.btn-primary{background:var(--orange);color:#fff;}
.btn-primary:hover{background:var(--orange-dark);}
.btn-ghost{background:transparent;color:#fff;border:1.5px solid #7d8ba0;}
.btn-ghost:hover{background:#fff;color:var(--ink);border-color:#fff;}
.hero-scroll{position:absolute;bottom:22px;left:50%;transform:translateX(-50%);color:#9aa5b2;font-size:12px;letter-spacing:3px;z-index:3;font-family:"Oswald";}

/* ============ 通用区块 ============ */
.section{padding:60px 0;}
.section-tight{padding:48px 0;}
.sec-head{margin-bottom:32px;position:relative;}
.sec-label{display:flex;align-items:center;gap:12px;font-family:"Oswald";letter-spacing:3px;color:var(--orange);font-size:14px;text-transform:uppercase;}
.sec-label::before{content:"";width:34px;height:3px;background:var(--orange);}
.sec-label.rev{color:var(--orange);}
h2.sec-title{font-size:clamp(26px,4vw,40px);font-weight:900;margin-top:10px;line-height:1.2;color:var(--ink);}
.sec-desc{margin-top:10px;color:var(--muted);max-width:760px;}
.sec-head.center{text-align:center;}
.sec-head.center .sec-label{justify-content:center;}
.sec-head.center .sec-label::before{content:none;}
.sec-head.center .sec-label::after{content:"";width:34px;height:3px;background:var(--orange);}

/* 编号角标 */
.num-tag{font-family:"Oswald";font-size:13px;letter-spacing:2px;color:var(--orange);}

/* 深色区块 */
.section-dark{background:var(--ink-2);color:#dfe5ec;}
.section-dark h2.sec-title{color:#fff;}
.section-dark .sec-desc{color:#aab4c0;}
.section-dark .num-tag{color:var(--orange);}

/* 钢板/混凝土深色横条标题 */
.strip{background:var(--ink);color:#fff;padding:70px 0;}
.strip h1{font-size:clamp(30px,4.4vw,48px);font-weight:900;}
.strip .crumb{font-size:13px;color:#9aa5b2;letter-spacing:1px;margin-top:10px;font-family:"Oswald";}
.strip .crumb b{color:var(--orange);font-weight:600;}

/* ============ 首页：优势卡片 ============ */
.adv-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.adv{background:#fff;border:1px solid var(--line);padding:30px 26px;position:relative;transition:.25s;border-top:3px solid var(--orange);}
.adv:hover{transform:translateY(-6px);box-shadow:var(--shadow);}
.adv .ic{width:54px;height:54px;background:var(--concrete-2);display:flex;align-items:center;justify-content:center;color:var(--steel);margin-bottom:20px;}
.adv:hover .ic{background:var(--orange);color:#fff;}
.adv h3{font-size:18px;font-weight:800;margin-bottom:10px;color:var(--ink);}
.adv p{font-size:14px;color:var(--muted);}

/* ============ 服务行业图片卡片 ============ */
.industry-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.industry-card{background:#fff;border:1px solid var(--line);border-top:3px solid var(--orange);overflow:hidden;transition:.25s;}
.industry-card:hover{box-shadow:var(--shadow);transform:translateY(-6px);}
.industry-card .thumb{aspect-ratio:3/4;background:var(--concrete-2);}
.industry-card .thumb img{width:100%;height:100%;object-fit:contain;}
.industry-card .cap{padding:16px 18px;border-top:1px solid var(--line);}
.industry-card .cap h3{font-size:17px;font-weight:800;color:var(--ink);}
.industry-card .cap p{font-size:13px;color:var(--muted);margin-top:4px;}

/* ============ 常见问题 FAQ ============ */
.faq-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
.faq-item{background:#fff;border:1px solid var(--line);border-left:4px solid var(--steel);padding:16px 18px;}
.faq-item h4{font-size:15px;font-weight:700;color:var(--ink);margin-bottom:6px;}
.faq-item p{font-size:13.5px;color:#333;margin:0;}

/* ============ 新闻分页 ============ */
.pager{display:flex;gap:8px;justify-content:center;margin-top:40px;flex-wrap:wrap;}
.pager .pg{display:inline-flex;align-items:center;justify-content:center;min-width:42px;height:42px;padding:0 14px;background:#fff;border:1px solid var(--line);color:var(--steel);font-weight:700;font-size:14px;transition:.2s;}
.pager .pg:hover{background:var(--steel);color:#fff;}
.pager .pg.active{background:var(--orange);color:#fff;border-color:var(--orange);}
.nitem .src{font-size:12px;color:var(--muted);margin-top:8px;}

/* ============ 产品分类（首页）+ 产品页 ============ */
.cat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.cat-card{background:#fff;border:1px solid var(--line);overflow:hidden;transition:.25s;position:relative;}
.cat-card:hover{box-shadow:var(--shadow);transform:translateY(-6px);border-color:var(--orange);}
.cat-card .thumb{position:relative;overflow:hidden;aspect-ratio:4/3;background:var(--concrete-2);}
.cat-card .thumb img{width:100%;height:100%;object-fit:contain;transition:.5s;}
.cat-card:hover .thumb img{transform:scale(1.06);}
.cat-card .thumb::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 60%,rgba(21,27,35,.55));}
.cat-card .body{padding:22px 24px 26px;}
.cat-card h3{font-size:19px;font-weight:800;color:var(--ink);display:flex;align-items:center;gap:10px;}
.cat-card h3 .en{color:var(--orange);font-size:12px;letter-spacing:2px;}
.cat-card p{font-size:14px;color:var(--muted);margin-top:8px;line-height:1.7;}
.cat-card .more{margin-top:16px;display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:700;color:var(--steel);letter-spacing:1px;font-family:"Oswald";}
.cat-card .more svg{transition:.2s;}
.cat-card:hover .more{color:var(--orange);}
.cat-card:hover .more svg{transform:translateX(4px);}

/* 首页：流程时间线 */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:0;position:relative;}
.steps::before{content:"";position:absolute;top:26px;left:6%;right:6%;height:2px;background:var(--line);}
.step{position:relative;padding-top:6px;}
.step .dot{width:52px;height:52px;background:var(--ink-2);color:var(--orange);display:flex;align-items:center;justify-content:center;font-family:"Oswald";font-size:22px;font-weight:700;position:relative;z-index:2;border:3px solid #fff;box-shadow:0 0 0 1px var(--line);}
.step h4{margin-top:22px;font-size:17px;font-weight:800;color:var(--ink);}
.step p{font-size:13.5px;color:var(--muted);margin-top:8px;line-height:1.7;}

/* ============ 规格表（产品页） ============ */
.spec-table{width:100%;border-collapse:collapse;table-layout:fixed;background:#fff;}
.spec-table th,.spec-table td{border:1px solid var(--line);padding:12px 14px;font-size:14px;text-align:left;vertical-align:top;}
.spec-table th{background:var(--ink-2);color:#fff;font-weight:600;font-size:13px;letter-spacing:1px;}
.spec-table td b{color:var(--ink);}
.spec-table tr:nth-child(even) td{background:#fafbfc;}
.colgroup-note{font-size:13px;color:var(--muted);margin-top:12px;}

/* ============ 案例 ============ */
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.case-card{background:#fff;border:1px solid var(--line);overflow:hidden;transition:.25s;display:flex;flex-direction:column;}
.case-card:hover{box-shadow:var(--shadow);transform:translateY(-6px);border-color:var(--orange);}
.case-card .thumb{aspect-ratio:16/10;overflow:hidden;position:relative;background:var(--concrete-2);}
.case-card .thumb img{width:100%;height:100%;object-fit:contain;transition:.5s;}
.case-card:hover .thumb img{transform:scale(1.05);}
.case-card .body{padding:22px 24px;flex:1;display:flex;flex-direction:column;}
.case-card h3{font-size:18px;font-weight:800;color:var(--ink);}
.case-card .tags{margin:12px 0;display:flex;flex-wrap:wrap;gap:8px;}
.case-card .tag{font-size:12px;color:var(--steel);background:var(--concrete-2);border:1px solid var(--line);padding:3px 10px;font-family:"Oswald";letter-spacing:1px;}
.case-card p{font-size:14px;color:var(--muted);margin-top:auto;}

/* ============ 关于：数字/能力 ============ */
.about-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:60px;align-items:center;}
.about-photo{position:relative;}
.about-photo img{border:1px solid var(--line);}
.about-photo::before{content:"";position:absolute;inset:-16px 16px 16px -16px;border:3px solid var(--orange);z-index:-1;}
.about-list li{display:flex;gap:14px;padding:14px 0;border-bottom:1px dashed var(--line);align-items:flex-start;}
.about-list li .n{font-family:"Oswald";color:var(--orange);font-weight:700;flex-shrink:0;}
.about-list li p{font-size:15px;}
.value-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.value{background:rgba(255,255,255,.04);border:1px solid #3a4658;padding:28px 24px;text-align:center;}
.value .big{font-family:"Oswald";font-size:44px;font-weight:700;color:var(--orange);line-height:1;}
.value h4{margin-top:12px;font-size:16px;color:#fff;font-weight:700;}
.value p{font-size:13px;color:#aab4c0;margin-top:8px;}

/* ============ 工业流程 1-2-3 ============ */
.flow{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.flow-item{background:#fff;border:1px solid var(--line);padding:34px 28px;position:relative;}
.flow-item .idx{font-family:"Oswald";font-size:56px;font-weight:700;color:var(--concrete-2);line-height:1;margin-bottom:14px;}
.flow-item h3{font-size:18px;font-weight:800;color:var(--ink);margin-bottom:10px;}
.flow-item p{font-size:14px;color:var(--muted);}

/* ============ 新闻 ============ */
.news-list .nitem{display:grid;grid-template-columns:130px 1fr auto;gap:26px;align-items:center;padding:26px 0;border-bottom:1px solid var(--line);transition:.2s;}
.news-list .nitem:hover{background:#fafbfc;padding-left:14px;}
.nitem .date{font-family:"Oswald";text-align:center;border-right:2px solid var(--orange);padding-right:20px;}
.nitem .date b{display:block;font-size:34px;color:var(--ink);line-height:1;}
.nitem .date span{font-size:13px;color:var(--muted);letter-spacing:1px;}
.nitem h3{font-size:19px;font-weight:800;color:var(--ink);line-height:1.4;}
.nitem p{font-size:14px;color:var(--muted);margin-top:6px;}
.nitem .go{color:var(--orange);font-family:"Oswald";letter-spacing:2px;font-size:13px;}
.news-detail h2{font-size:30px;font-weight:900;color:var(--ink);line-height:1.4;}
.news-meta{color:var(--muted);font-size:14px;margin:14px 0 26px;border-bottom:1px solid var(--line);padding-bottom:20px;}
.news-body p{margin-bottom:18px;line-height:2;color:#39424e;}

/* ============ 联系 ============ */
.contact-grid{display:grid;grid-template-columns:1fr 1.15fr;gap:60px;}
.cinfo .cell{display:flex;gap:18px;padding:20px 0;border-bottom:1px solid var(--line);align-items:flex-start;}
.cinfo .cell .ic{width:52px;height:52px;background:var(--ink-2);color:var(--orange);display:flex;align-items:center;justify-content:center;flex-shrink:0;}
.cinfo .cell h4{font-size:14px;color:var(--muted);font-weight:500;letter-spacing:1px;}
.cinfo .cell b{font-size:18px;color:var(--ink);font-weight:800;display:block;margin-top:3px;}
.cinfo .cell p{font-size:14px;color:var(--text);margin-top:2px;}
.form-card{background:#fff;border:1px solid var(--line);padding:34px;}
.form-card h3{font-size:22px;font-weight:900;color:var(--ink);margin-bottom:6px;}
.form-card .sub{font-size:14px;color:var(--muted);margin-bottom:26px;}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:18px;}
.form-group{margin-bottom:18px;}
.form-group label{display:block;font-size:13px;font-weight:600;color:var(--steel);margin-bottom:7px;letter-spacing:.5px;}
.form-group input,.form-group select,.form-group textarea{
  width:100%;padding:12px 14px;border:1px solid var(--line);font-size:16px;font-family:inherit;
  background:#fbfcfd;color:var(--text);transition:.2s;
}
.form-group input:focus,.form-group select:focus,.form-group textarea:focus{outline:none;border-color:var(--orange);background:#fff;box-shadow:0 0 0 3px rgba(240,118,28,.12);}
.form-group textarea{min-height:130px;resize:vertical;}
.form-tip{font-size:13px;color:var(--muted);margin-top:14px;}
.submit-btn{background:var(--orange);color:#fff;border:none;padding:14px 30px;font-weight:700;font-size:16px;cursor:pointer;width:100%;transition:.2s;}
.submit-btn:hover{background:var(--orange-dark);}

/* 地图占位 */
.mapbox{position:relative;overflow:hidden;border:1px solid var(--line);min-height:320px;background:var(--concrete-2);}
.mapbox .grid-bg{position:absolute;inset:0;}
.mapbox .map-pin{position:absolute;top:50%;left:50%;transform:translate(-50%,-100%);text-align:center;z-index:2;}
.mapbox .pin{width:46px;height:46px;background:var(--orange);clip-path:polygon(50% 100%,0 0,100% 0);transform:rotate(180deg);margin:0 auto;}
.mapbox .pin i{display:block;width:30px;height:30px;background:#fff;clip-path:polygon(50% 100%,0 0,100% 0);transform:rotate(180deg);margin:8px auto 0;}
.mapbox .addr-label{margin-top:10px;background:var(--ink);color:#fff;padding:6px 14px;font-size:13px;white-space:nowrap;}

/* ============ CTA 条 ============ */
.cta-band{background:var(--orange);color:#fff;padding:54px 0;position:relative;overflow:hidden;}
.cta-band::after{content:"";position:absolute;right:-40px;top:-40px;width:260px;height:260px;border:26px solid rgba(255,255,255,.14);border-radius:50%;}
.cta-band .container{display:flex;align-items:center;justify-content:space-between;gap:30px;flex-wrap:wrap;position:relative;z-index:2;}
.cta-band h3{font-size:clamp(22px,3vw,32px);font-weight:900;}
.cta-band p{font-size:15px;opacity:.95;margin-top:6px;max-width:600px;}
.cta-band .btn{background:var(--ink);color:#fff;}
.cta-band .btn:hover{background:#000;}

/* ============ Footer ============ */
.footer{background:var(--ink);color:#9aa5b2;padding:70px 0 0;}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:40px;padding-bottom:50px;}
.foot-grid h4{color:#fff;font-size:16px;font-weight:700;margin-bottom:20px;position:relative;padding-bottom:12px;}
.foot-grid h4::after{content:"";position:absolute;left:0;bottom:0;width:30px;height:3px;background:var(--orange);}
.foot-grid a{display:block;padding:6px 0;font-size:14px;transition:.2s;}
.foot-grid a:hover{color:var(--orange);}
.foot-grid p{font-size:14px;line-height:1.9;}
.foot-about .logo-cn{color:#fff;}
.foot-about .logo-en{color:var(--orange);}
.foot-about p{margin-top:16px;}
.foot-contact p{display:flex;gap:10px;align-items:flex-start;margin-bottom:12px;font-size:14px;}
.foot-contact svg{flex-shrink:0;margin-top:4px;color:var(--orange);}
.foot-bottom{border-top:1px solid #2b3440;padding:22px 0;font-size:13px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;}

/* 返回顶部 */
.to-top{position:fixed;right:24px;bottom:26px;width:48px;height:48px;background:var(--orange);color:#fff;display:none;align-items:center;justify-content:center;cursor:pointer;z-index:90;box-shadow:0 6px 18px rgba(20,28,40,.3);border:none;}
.to-top.show{display:flex;}

/* 滚动显现 */
.reveal{opacity:0;transform:translateY(28px);transition:.7s cubic-bezier(.2,.7,.3,1);}
.reveal.in{opacity:1;transform:none;}

/* 产品详情行（图文并排） */
.prow{display:grid;grid-template-columns:420px 1fr;gap:40px;align-items:start;}
@media (max-width:860px){.prow{grid-template-columns:1fr;}}

/* 产品锚点导航 */
.tag{display:inline-block;}

/* ============ 响应式 ============ */
@media (max-width:1000px){
  .adv-grid{grid-template-columns:repeat(2,1fr);}
  .steps{grid-template-columns:repeat(2,1fr);gap:24px;}
  .steps::before{display:none;}
  .value-grid{grid-template-columns:repeat(2,1fr);}
  .about-grid{grid-template-columns:1fr;}
  .contact-grid{grid-template-columns:1fr;}
  .industry-grid{grid-template-columns:repeat(2,1fr);}
  .foot-grid{grid-template-columns:1fr 1fr;}
  .nav,.header-cta{display:none;}
  .nav-toggle{display:flex;}
  .logo-name strong{font-size:12.5px;letter-spacing:.5px;}
  .logo-name small{display:none;}
  .header .container{gap:12px;}
}
@media (max-width:640px){
  .section{padding:40px 0;}
  .sec-head{margin-bottom:24px;}
  .hero .container{padding:60px 0 70px;}
  .cat-grid{grid-template-columns:1fr;}
  .case-grid{grid-template-columns:1fr;}
  .adv-grid{grid-template-columns:1fr;}
  .industry-grid{grid-template-columns:1fr;}
  .flow{grid-template-columns:1fr;}
  .form-row{grid-template-columns:1fr;}
  .steps{grid-template-columns:1fr;}
  .foot-grid{grid-template-columns:1fr;}
  .hstat b{font-size:30px;}
  .hero-stats{flex-wrap:wrap;}
  .topbar .tb-tag{display:none;}
}

/* ============ 手机端底部快捷导航栏 ============ */
.mob-bar{display:none;}
@media (max-width:768px){
  .mob-bar{display:flex;position:fixed;left:0;right:0;bottom:0;height:58px;background:#151B23;
    border-top:1px solid #2a3442;z-index:150;box-shadow:0 -4px 18px rgba(13,17,23,.35);}
  .mob-bar a{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;
    gap:3px;color:#c7d0dc;font-size:11px;text-decoration:none;-webkit-tap-highlight-color:transparent;}
  .mob-bar a svg{width:22px;height:22px;}
  .mob-bar a.on{color:var(--orange);}
  .mob-bar a.call{background:var(--orange);color:#fff;font-size:12px;font-weight:700;}
  .mob-bar a.call svg{width:24px;height:24px;}
  body{padding-bottom:58px;}
  .to-top{bottom:80px;right:16px;}
}