/* ============================================================
   四川鼎信恒科技有限公司 · 仟莱充电 官网样式
   风格：场景叙事骨架 × 高端深色视觉（V1.0 第四节色板）
   深空蓝 #0A1F3C · 科技蓝 #14509E · 能源绿 #00A870
   ============================================================ */
:root{
  --blue-deep:#0a1f3c;
  --blue:#14509e;
  --blue-mid:#1668dc;
  --green:#00a870;
  --green-bright:#00d68f;
  --ink:#1f2329;
  --sub:#5c6470;
  --line:#e5e9f0;
  --bg:#f6f8fa;
  --card:#ffffff;
  --foot:#081729;
  --shadow:0 10px 40px rgba(10,31,60,.10);
  --radius:12px;
  --nav-h:72px;
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{
  font-family:"Microsoft YaHei","PingFang SC","Segoe UI",sans-serif;
  color:var(--ink);background:var(--card);
  font-size:15px;line-height:1.8;
  overflow-x:hidden;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;transition:color .25s;}
ul,ol{list-style:none;}
table{border-collapse:collapse;width:100%;}
button{font-family:inherit;cursor:pointer;border:none;background:none;}

/* ---------- 通用布局 ---------- */
.container{max-width:1200px;margin:0 auto;padding:0 24px;}
.section{padding:84px 0;}
.section-tint{background:var(--bg);}
.sec-head{max-width:760px;margin:0 auto 46px;text-align:center;}
.sec-head.left{margin:0 0 38px;text-align:left;}
.sec-head .en{
  display:inline-block;font-size:12px;letter-spacing:4px;color:var(--green);
  text-transform:uppercase;margin-bottom:8px;font-weight:600;
}
.sec-head h2{font-size:32px;color:var(--blue-deep);letter-spacing:1px;line-height:1.35;}
.sec-head p{color:var(--sub);margin-top:10px;font-size:15px;}
.sec-head.left h2{font-size:27px;}
.divider{width:56px;height:4px;border-radius:2px;background:linear-gradient(90deg,var(--green),var(--blue-mid));margin:16px auto 0;}
.sec-head.left .divider{margin-left:0;}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:13px 34px;border-radius:8px;font-size:15px;letter-spacing:1px;
  transition:all .3s;line-height:1.4;
}
.btn-primary{background:var(--green);color:#fff;box-shadow:0 6px 20px rgba(0,168,112,.35);}
.btn-primary:hover{background:#00c07d;transform:translateY(-2px);box-shadow:0 10px 26px rgba(0,168,112,.45);}
.btn-ghost{border:1px solid rgba(255,255,255,.55);color:#fff;background:transparent;}
.btn-ghost:hover{background:rgba(255,255,255,.12);border-color:#fff;}
.btn-outline{border:1px solid var(--green);color:var(--green);background:transparent;}
.btn-outline:hover{background:var(--green);color:#fff;}
.btn-blue{background:var(--blue);color:#fff;}
.btn-blue:hover{background:var(--blue-mid);transform:translateY(-2px);}

/* ---------- 顶部导航 ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:1000;height:var(--nav-h);
  display:flex;align-items:center;
  background:rgba(10,31,60,.72);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid rgba(255,255,255,.08);
  transition:background .3s, box-shadow .3s;
}
.site-header.scrolled{background:rgba(8,23,41,.96);box-shadow:0 4px 24px rgba(0,0,0,.25);}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;width:100%;}
.brand{display:flex;align-items:center;gap:12px;flex:none;}
.brand img{height:44px;width:auto;}
.brand .brand-txt{line-height:1.2;}
.brand .brand-txt b{display:block;color:#fff;font-size:17px;letter-spacing:2px;}
.brand .brand-txt span{display:block;color:rgba(255,255,255,.55);font-size:10.5px;letter-spacing:2.5px;margin-top:2px;}
.main-nav{display:flex;align-items:center;gap:4px;}
.main-nav a{
  color:rgba(255,255,255,.82);font-size:14.5px;padding:10px 12px;border-radius:6px;
  position:relative;letter-spacing:.5px;white-space:nowrap;
}
.main-nav a:hover{color:#fff;background:rgba(255,255,255,.08);}
.main-nav a.active{color:#fff;}
.main-nav a.active::after{
  content:"";position:absolute;left:12px;right:12px;bottom:2px;height:2px;
  background:var(--green-bright);border-radius:1px;
}
.nav-cta{margin-left:8px;}
.header-tel{display:flex;flex-direction:row;align-items:center;gap:8px;margin-left:14px;line-height:1.3;white-space:nowrap;flex:none;}
.header-tel .lab{font-size:11.5px;color:rgba(255,255,255,.55);letter-spacing:1px;}
.header-tel .num{font-size:15px;color:#fff;font-weight:700;letter-spacing:.5px;font-family:Consolas,DINAlt,sans-serif;}
.hamburger{display:none;flex-direction:column;gap:5px;padding:8px;}
.hamburger span{width:24px;height:2px;background:#fff;border-radius:2px;transition:all .3s;}

/* ---------- 首页 Hero ---------- */
.hero{
  position:relative;min-height:92vh;display:flex;align-items:center;
  background:var(--blue-deep);color:#fff;overflow:hidden;
}
.hero .hero-bg{
  position:absolute;inset:0;
  background:url("../img/hero/hero-campus-night.png") center/cover no-repeat;
  opacity:.55;transition:opacity .8s;
}
.hero .hero-mask{
  position:absolute;inset:0;
  background:linear-gradient(100deg,rgba(6,17,34,.94) 0%,rgba(9,29,56,.82) 42%,rgba(10,31,60,.38) 100%);
}
.hero-inner{position:relative;z-index:2;width:100%;padding:150px 0 90px;}
.scene-tabs{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:30px;}
.scene-tabs button{
  border:1px solid rgba(255,255,255,.4);border-radius:22px;color:rgba(255,255,255,.85);
  padding:7px 22px;font-size:14px;letter-spacing:2px;transition:all .3s;background:rgba(255,255,255,.04);
}
.scene-tabs button:hover{border-color:#fff;color:#fff;}
.scene-tabs button.on{background:var(--green);border-color:var(--green);color:#fff;box-shadow:0 4px 16px rgba(0,168,112,.4);}
.hero h1{font-size:46px;letter-spacing:3px;line-height:1.3;font-weight:700;margin-bottom:20px;max-width:720px;}
.hero h1 .hl{color:var(--green-bright);}
.hero .hero-sub{font-size:17px;color:rgba(255,255,255,.78);max-width:640px;margin-bottom:38px;}
.hero-cta{display:flex;gap:16px;flex-wrap:wrap;}
.hero-note{margin-top:34px;font-size:13px;color:rgba(255,255,255,.45);letter-spacing:1px;}

/* ---------- 数据条 ---------- */
.stats-band{background:#0d2648;color:#fff;padding:34px 0;position:relative;z-index:3;}
.stats-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:18px;text-align:center;}
.stat b{display:block;font-size:38px;font-weight:700;color:var(--green-bright);font-family:Consolas,"Microsoft YaHei",sans-serif;line-height:1.15;}
.stat b i{font-style:normal;font-size:20px;}
.stat span{font-size:13px;color:rgba(255,255,255,.65);letter-spacing:1.5px;}

/* ---------- 卡片通用 ---------- */
.grid{display:grid;gap:26px;}
.grid-3{grid-template-columns:repeat(3,1fr);}
.grid-4{grid-template-columns:repeat(4,1fr);}
.grid-2{grid-template-columns:repeat(2,1fr);}

/* 场景方案卡 */
.scene-card{
  border-radius:var(--radius);overflow:hidden;position:relative;
  box-shadow:var(--shadow);transition:transform .35s, box-shadow .35s;
  background:#fff;display:flex;flex-direction:column;
}
.scene-card:hover{transform:translateY(-8px);box-shadow:0 22px 48px rgba(10,31,60,.18);}
.scene-card .ph{height:200px;overflow:hidden;position:relative;background:var(--blue-deep);}
.scene-card .ph img{width:100%;height:100%;object-fit:cover;transition:transform .6s;}
.scene-card:hover .ph img{transform:scale(1.07);}
.scene-card .ph .badge{
  position:absolute;top:14px;left:14px;background:rgba(10,31,60,.78);color:#fff;
  font-size:12px;padding:3px 12px;border-radius:14px;letter-spacing:2px;
  backdrop-filter:blur(4px);
}
.scene-card .tx{padding:22px 24px 26px;flex:1;display:flex;flex-direction:column;}
.scene-card .tx h3{font-size:19px;color:var(--blue-deep);margin-bottom:8px;}
.scene-card .tx p{color:var(--sub);font-size:14px;flex:1;}
.scene-card .tx .more{
  margin-top:14px;font-size:13.5px;color:var(--green);font-weight:600;letter-spacing:1px;
}
.scene-card .tx .more:hover{color:#00c07d;}
.scene-card .sc-ic{width:52px;height:52px;border-radius:14px;background:linear-gradient(135deg,rgba(0,168,112,.12),rgba(20,80,158,.10));display:flex;align-items:center;justify-content:center;font-size:24px;margin:24px 24px 0;}
.scene-card .sc-ic + h3{margin:16px 24px 8px;font-size:19px;color:var(--blue-deep);}
.scene-card > p{margin:0 24px 18px;color:var(--sub);font-size:14px;}
.scene-card > .more-link{display:inline-block;margin:0 24px 24px;font-size:13px;color:var(--green);border:1px solid var(--green);border-radius:20px;padding:6px 18px;transition:all .3s;align-self:flex-start;}
.scene-card > .more-link:hover{background:var(--green);color:#fff;}
.sec-head .sec-sub{color:var(--sub);margin-top:12px;font-size:15px;}

/* 产品卡 */
.prod-card{
  border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff;
  transition:all .35s;display:flex;flex-direction:column;
}
.prod-card:hover{border-color:var(--green);box-shadow:0 18px 40px rgba(0,168,112,.14);transform:translateY(-6px);}
.prod-card .ph{height:230px;background:#f8fafc;display:flex;align-items:center;justify-content:center;padding:18px;}
.prod-card .ph img{max-height:100%;object-fit:contain;transition:transform .5s;}
.prod-card:hover .ph img{transform:scale(1.05);}
.prod-card .tx{padding:20px 22px 24px;border-top:1px solid var(--line);flex:1;display:flex;flex-direction:column;}
.prod-card .tx .model{font-size:12px;color:var(--green);letter-spacing:2px;font-weight:700;font-family:Consolas,sans-serif;}
.prod-card .tx h3{font-size:18px;color:var(--blue-deep);margin:4px 0 8px;}
.prod-card .tx p{font-size:13.5px;color:var(--sub);flex:1;}
.prod-card .tx .specs{margin-top:12px;display:flex;gap:8px;flex-wrap:wrap;}
.prod-card .tx .specs span{
  font-size:12px;color:var(--blue);background:#eef4fd;border-radius:4px;padding:2px 10px;
}

/* 研发深色专区 */
.rd-band{
  background:
    radial-gradient(ellipse 60% 80% at 85% 20%, rgba(22,104,220,.25), transparent 60%),
    radial-gradient(ellipse 50% 70% at 10% 90%, rgba(0,168,112,.16), transparent 60%),
    linear-gradient(160deg,#050f1f 0%, #0a1f3c 55%, #0d2b52 100%);
  color:#fff;
}
.rd-grid{display:grid;grid-template-columns:1fr 1fr;gap:26px;}
.rd-card{
  border:1px solid rgba(255,255,255,.14);border-radius:var(--radius);
  padding:36px 34px;position:relative;overflow:hidden;
  background:linear-gradient(150deg,rgba(255,255,255,.05),rgba(255,255,255,.015));
  transition:border-color .35s, transform .35s;
}
.rd-card:hover{border-color:rgba(0,214,143,.6);transform:translateY(-5px);}
.rd-card .tag{
  display:inline-block;font-size:11.5px;letter-spacing:2.5px;color:var(--green-bright);
  border:1px solid rgba(0,214,143,.45);border-radius:14px;padding:2px 14px;margin-bottom:18px;
}
.rd-card h3{font-size:23px;margin-bottom:12px;letter-spacing:1px;}
.rd-card p{color:rgba(255,255,255,.72);font-size:14.5px;margin-bottom:14px;}
.rd-card ul{margin-bottom:6px;}
.rd-card ul li{
  position:relative;padding-left:20px;font-size:14px;color:rgba(255,255,255,.82);margin-bottom:8px;
}
.rd-card ul li::before{
  content:"";position:absolute;left:0;top:11px;width:8px;height:8px;border-radius:2px;
  background:linear-gradient(135deg,var(--green-bright),var(--blue-mid));
}
.rd-card .rd-img{margin-top:20px;border-radius:10px;overflow:hidden;border:1px solid rgba(255,255,255,.12);}
.rd-card .rd-img img{width:100%;}
.rd-card .more-link{
  display:inline-block;margin-top:16px;font-size:13.5px;color:var(--green-bright);
  border:1px solid rgba(0,214,143,.5);border-radius:18px;padding:6px 22px;letter-spacing:1px;
  transition:all .3s;
}
.rd-card .more-link:hover{background:var(--green);border-color:var(--green);color:#fff;}

/* 信任资质条 */
.trust-band{background:#f4f8ff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 34px;display:flex;gap:14px;flex-wrap:wrap;justify-content:center;}
.trust-band span{
  border:1px dashed #c3d3ea;border-radius:8px;background:#fff;
  padding:10px 22px;font-size:14px;color:var(--blue-deep);letter-spacing:.5px;
  display:inline-flex;align-items:center;gap:8px;
}
.trust-band span::before{content:"✓";color:var(--green);font-weight:700;}

/* ---------- 内页 banner ---------- */
.page-banner{
  position:relative;padding:168px 0 74px;color:#fff;overflow:hidden;
  background:linear-gradient(115deg,#06152b 0%,#0e2f5c 60%,#123a72 100%);
}
.page-banner .pb-deco{
  position:absolute;inset:0;opacity:.35;
  background:url("../img/hero/texture-green-building.jpg") center/cover no-repeat;
  mix-blend-mode:screen;
}
.page-banner .pb-mask{position:absolute;inset:0;background:linear-gradient(180deg,rgba(6,17,34,.55),rgba(10,31,60,.92));}
.page-banner .container{position:relative;z-index:2;}
.breadcrumb{font-size:13px;color:rgba(255,255,255,.6);letter-spacing:1px;margin-bottom:14px;}
.breadcrumb a{color:rgba(255,255,255,.75);}
.breadcrumb a:hover{color:var(--green-bright);}
.page-banner h1{font-size:38px;letter-spacing:2px;margin-bottom:10px;}
.page-banner .en{font-size:13px;letter-spacing:5px;color:rgba(255,255,255,.45);text-transform:uppercase;}
.page-banner .lead{margin-top:16px;color:rgba(255,255,255,.78);max-width:760px;font-size:15.5px;}

/* ---------- 内页组件 ---------- */
/* 文块 + 图 */
.split{display:grid;grid-template-columns:1fr 1fr;gap:46px;align-items:center;}
.split.rev .split-img{order:-1;}
.split-img{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);position:relative;}
.split-img .mark{
  position:absolute;right:10px;bottom:10px;background:rgba(10,31,60,.72);color:rgba(255,255,255,.85);
  font-size:11px;padding:2px 10px;border-radius:10px;letter-spacing:1px;
}
.mark-inline{display:inline-block;font-size:11px;color:#8a97a8;border:1px solid var(--line);border-radius:4px;padding:1px 7px;margin-left:8px;vertical-align:2px;letter-spacing:1px;font-weight:400;}
.split-txt h2{font-size:26px;color:var(--blue-deep);margin-bottom:16px;letter-spacing:1px;}
.split-txt p{color:var(--sub);margin-bottom:12px;font-size:14.5px;}
.split-txt .keyline{
  border-left:4px solid var(--green);background:#f2faf7;border-radius:0 8px 8px 0;
  padding:12px 18px;margin:16px 0;color:#0b4f36;font-size:14px;
}

/* 特性列表 */
.feat-list{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:22px;}
.feat-item{border:1px solid var(--line);border-radius:10px;padding:18px 20px;background:#fff;transition:all .3s;}
.feat-item:hover{border-color:var(--green);box-shadow:0 8px 24px rgba(0,168,112,.10);}
.feat-item b{display:flex;align-items:center;gap:10px;color:var(--blue-deep);font-size:15.5px;margin-bottom:6px;}
.feat-item b .ic{
  width:34px;height:34px;border-radius:8px;background:linear-gradient(135deg,#e6fbf3,#dcf2ff);
  display:inline-flex;align-items:center;justify-content:center;font-size:16px;flex:none;
}
.feat-item p{font-size:13.5px;color:var(--sub);}

/* 数据小卡 */
.data-tiles{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.data-tile{
  background:linear-gradient(160deg,#0c2547,#123a72);border-radius:var(--radius);
  color:#fff;padding:26px 22px;text-align:center;transition:transform .3s;
}
.data-tile:hover{transform:translateY(-5px);}
.data-tile b{display:block;font-size:34px;color:var(--green-bright);font-family:Consolas,"Microsoft YaHei",sans-serif;line-height:1.2;}
.data-tile b i{font-style:normal;font-size:18px;}
.data-tile span{font-size:13px;color:rgba(255,255,255,.68);letter-spacing:1px;}

/* 流程时间线 */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;counter-reset:step;}
.step{position:relative;padding:26px 22px;border:1px solid var(--line);border-radius:var(--radius);background:#fff;}
.step::before{
  counter-increment:step;content:"0" counter(step);
  font-size:30px;font-weight:700;color:#e2ecf9;font-family:Consolas,sans-serif;
  position:absolute;top:14px;right:18px;line-height:1;
}
.step .ic{width:46px;height:46px;border-radius:12px;background:linear-gradient(135deg,var(--green),#0e8f61);color:#fff;display:flex;align-items:center;justify-content:center;font-size:20px;margin-bottom:14px;}
.step h3{font-size:16.5px;color:var(--blue-deep);margin-bottom:6px;}
.step p{font-size:13.5px;color:var(--sub);}

/* 表格 */
.tbl-wrap{border:1px solid var(--line);border-radius:var(--radius);overflow:auto;background:#fff;}
.tbl-wrap table{min-width:640px;font-size:14px;}
.tbl-wrap th{background:#eef3fa;color:var(--blue-deep);text-align:left;padding:12px 16px;font-weight:600;white-space:nowrap;}
.tbl-wrap td{border-top:1px solid var(--line);padding:11px 16px;color:#333f52;vertical-align:top;}
.tbl-wrap tr:hover td{background:#fafcff;}
.tbd{color:#b7bfc9;font-style:italic;}

/* 新闻列表 */
.news-item{
  display:flex;gap:26px;padding:26px 0;border-bottom:1px solid var(--line);
  transition:background .3s;
}
.news-item:hover{background:#fbfdff;}
.news-item .date{
  flex:none;width:86px;text-align:center;border-right:1px solid var(--line);padding-right:20px;
}
.news-item .date b{display:block;font-size:28px;color:var(--blue);font-family:Consolas,sans-serif;line-height:1.1;}
.news-item .date span{font-size:12.5px;color:var(--sub);}
.news-item .bd h3{font-size:17.5px;color:var(--blue-deep);margin-bottom:8px;font-weight:600;}
.news-item:hover .bd h3{color:var(--blue);}
.news-item .bd p{font-size:14px;color:var(--sub);}
.news-item .tag{
  display:inline-block;font-size:11.5px;color:var(--green);border:1px solid var(--green);
  border-radius:12px;padding:0 10px;margin-bottom:8px;
}

/* 资质证书卡 */
.cert-card{
  border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff;
  transition:all .3s;
}
.cert-card:hover{box-shadow:var(--shadow);transform:translateY(-4px);border-color:var(--blue-mid);}
.cert-card .ph{height:280px;background:#f6f8fa;display:flex;align-items:center;justify-content:center;padding:16px;cursor:zoom-in;}
.cert-card .ph img{max-height:100%;object-fit:contain;}
.cert-card .tx{padding:16px 20px;border-top:1px solid var(--line);}
.cert-card .tx b{color:var(--blue-deep);font-size:15.5px;display:block;}
.cert-card .tx span{font-size:12.5px;color:var(--sub);}

/* 案例卡 */
.case-card{
  border-radius:var(--radius);overflow:hidden;position:relative;background:#0a1f3c;
  box-shadow:var(--shadow);
}
.case-card img{width:100%;height:240px;object-fit:cover;opacity:.92;transition:transform .6s, opacity .4s;}
.case-card:hover img{transform:scale(1.06);opacity:1;}
.case-card .cap{
  position:absolute;left:0;right:0;bottom:0;padding:44px 22px 18px;color:#fff;
  background:linear-gradient(180deg,transparent,rgba(6,17,34,.92));
}
.case-card .cap b{font-size:16.5px;display:block;}
.case-card .cap span{font-size:12.5px;color:rgba(255,255,255,.72);}

/* 团队数据（克制呈现） */
.team-band{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:34px;display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center;}
.team-band div b{font-size:30px;color:var(--blue);font-family:Consolas,sans-serif;display:block;}
.team-band div span{font-size:13px;color:var(--sub);}

/* ---------- CTA 条 ---------- */
.cta-band{
  background:linear-gradient(115deg,#0a1f3c 0%,#14509e 100%);border-radius:var(--radius);
  color:#fff;padding:46px 50px;display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap;
  position:relative;overflow:hidden;
}
.cta-band::after{
  content:"";position:absolute;right:-70px;top:-70px;width:260px;height:260px;border-radius:50%;
  background:radial-gradient(circle,rgba(0,214,143,.35),transparent 70%);
}
.cta-band h3{font-size:24px;letter-spacing:1px;margin-bottom:6px;}
.cta-band p{color:rgba(255,255,255,.75);font-size:14.5px;}

/* ---------- 表单 ---------- */
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;}
.form-item{display:flex;flex-direction:column;gap:7px;}
.form-item.full{grid-column:1/-1;}
.form-item label{font-size:13.5px;color:var(--blue-deep);font-weight:600;}
.form-item label i{color:#e02020;font-style:normal;}
.form-item input,.form-item textarea,.form-item select{
  border:1px solid #d4dde9;border-radius:8px;padding:11px 14px;font-size:14px;font-family:inherit;
  transition:border-color .3s, box-shadow .3s;background:#fff;color:var(--ink);
}
.form-item input:focus,.form-item textarea:focus,.form-item select:focus{
  outline:none;border-color:var(--green);box-shadow:0 0 0 3px rgba(0,168,112,.14);
}
.form-item textarea{min-height:120px;resize:vertical;}
.captcha-row{display:flex;gap:12px;align-items:center;}
.captcha-code{
  flex:none;width:110px;height:44px;border-radius:8px;background:linear-gradient(115deg,#eef3fa,#e0ecfc);
  display:flex;align-items:center;justify-content:center;font-family:Consolas,monospace;
  font-size:19px;font-weight:700;letter-spacing:4px;color:var(--blue);user-select:none;
  text-decoration:line-through;
}
.form-tip{font-size:12.5px;color:var(--sub);}
.form-ok{
  display:none;background:#e6fffb;border:1px solid #87e8de;color:#0b7a67;border-radius:10px;
  padding:14px 18px;margin-top:16px;font-size:14px;
}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--foot);color:rgba(255,255,255,.62);font-size:13.5px;}
.foot-main{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:36px;padding:58px 0 40px;}
.foot-main h4{color:#fff;font-size:15.5px;margin-bottom:16px;letter-spacing:1px;font-weight:600;}
.foot-main p{margin-bottom:8px;line-height:1.9;}
.foot-main a{color:rgba(255,255,255,.62);}
.foot-main a:hover{color:var(--green-bright);}
.foot-brand img{height:46px;margin-bottom:14px;}
.foot-brand .slogan{color:rgba(255,255,255,.5);font-size:12.5px;letter-spacing:2px;margin-bottom:12px;}
.foot-qrcode{display:flex;gap:16px;align-items:flex-start;}
.foot-qrcode img{width:92px;height:92px;border-radius:8px;background:#fff;padding:5px;}
.foot-qrcode .qt b{display:block;color:#fff;font-size:14px;margin-bottom:4px;}
.foot-qrcode .qt span{font-size:12px;line-height:1.7;display:block;}
.foot-bottom{
  border-top:1px solid rgba(255,255,255,.09);padding:18px 0;
  display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;font-size:12.5px;color:rgba(255,255,255,.42);
}
.foot-bottom a{color:rgba(255,255,255,.55);}
.foot-bottom a:hover{color:var(--green-bright);}

/* ---------- 返回顶部 ---------- */
.back-top{
  position:fixed;right:26px;bottom:30px;width:46px;height:46px;border-radius:12px;
  background:var(--blue-deep);color:#fff;display:flex;align-items:center;justify-content:center;
  font-size:18px;box-shadow:0 8px 24px rgba(10,31,60,.35);opacity:0;pointer-events:none;
  transition:all .35s;z-index:900;
}
.back-top.show{opacity:1;pointer-events:auto;}
.back-top:hover{background:var(--green);transform:translateY(-4px);}

/* ---------- 滚动动画 ---------- */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s ease, transform .7s ease;}
.reveal.in{opacity:1;transform:none;}
.d1{transition-delay:.08s;} .d2{transition-delay:.16s;} .d3{transition-delay:.24s;} .d4{transition-delay:.32s;}

/* ---------- lightbox ---------- */
.lightbox{
  position:fixed;inset:0;background:rgba(5,12,24,.88);z-index:2000;
  display:none;align-items:center;justify-content:center;padding:40px;cursor:zoom-out;
}
.lightbox.show{display:flex;}
.lightbox img{max-width:min(920px,92vw);max-height:88vh;border-radius:10px;box-shadow:0 20px 80px rgba(0,0,0,.6);}
.lightbox .close{
  position:absolute;top:22px;right:30px;color:#fff;font-size:34px;line-height:1;opacity:.8;
}
.lightbox .close:hover{opacity:1;}

/* ---------- 响应式 ---------- */
@media (max-width:1180px){
  .header-tel{display:none;}
}
@media (max-width:1080px){
  .stats-grid{grid-template-columns:repeat(3,1fr);row-gap:26px;}
  .grid-4{grid-template-columns:repeat(2,1fr);}
  .steps{grid-template-columns:repeat(2,1fr);}
  .foot-main{grid-template-columns:1fr 1fr;}
}
@media (max-width:860px){
  .main-nav{
    position:fixed;top:var(--nav-h);right:0;left:0;background:#0a1f3c;
    flex-direction:column;align-items:stretch;padding:14px 20px 22px;gap:2px;
    border-bottom:1px solid rgba(255,255,255,.12);
    transform:translateY(-140%);transition:transform .35s;z-index:990;
    max-height:calc(100vh - var(--nav-h));overflow:auto;
  }
  .main-nav.open{transform:none;}
  .main-nav a{padding:13px 10px;border-bottom:1px solid rgba(255,255,255,.06);font-size:15px;}
  .main-nav a.active::after{display:none;}
  .nav-cta{margin:12px 0 0;text-align:center;}
  .hamburger{display:flex;}
  .hero h1{font-size:31px;letter-spacing:2px;}
  .hero .hero-sub{font-size:15px;}
  .hero-inner{padding:128px 0 70px;}
  .grid-3,.grid-2,.rd-grid,.split,.feat-list{grid-template-columns:1fr;}
  .split.rev .split-img{order:0;}
  .section{padding:60px 0;}
  .sec-head h2{font-size:25px;}
  .data-tiles{grid-template-columns:repeat(2,1fr);}
  .team-band{grid-template-columns:repeat(2,1fr);}
  .form-grid{grid-template-columns:1fr;}
  .page-banner{padding:140px 0 56px;}
  .page-banner h1{font-size:29px;}
  .foot-main{grid-template-columns:1fr;gap:28px;padding:44px 0 30px;}
  .cta-band{padding:34px 26px;}
  .stat b{font-size:30px;}
  .news-item{flex-direction:column;gap:8px;}
  .news-item .date{width:auto;border-right:none;padding:0;display:flex;gap:10px;align-items:baseline;}
  .news-item .date b{font-size:20px;}
  .cert-card .ph{height:230px;}
}
@media (max-width:480px){
  .stats-grid{grid-template-columns:repeat(2,1fr);}
  .grid-4{grid-template-columns:1fr;}
  .steps{grid-template-columns:1fr;}
  .scene-tabs button{padding:6px 15px;font-size:13px;}
  .brand .brand-txt b{font-size:15px;}
  .hero h1{font-size:26px;}
}