/* ===== 腾安供应链官网 · 全局样式 ===== */
:root{
  --brand:#185098;        /* 品牌蓝（取自LOGO） */
  --brand-dark:#0F3A72;
  --brand-light:#E8F0FA;
  --red:#B01830;          /* LOGO红，仅点缀 */
  --ink:#1F2937;
  --ink-2:#4B5563;
  --ink-3:#8A94A3;
  --bg:#F7F8FA;
  --line:#E5E8EE;
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{font-family:"Microsoft YaHei","PingFang SC","Segoe UI",system-ui,sans-serif;background:var(--bg);color:var(--ink);line-height:1.6;-webkit-font-smoothing:antialiased;}
a{color:inherit;text-decoration:none;}
img{max-width:100%;display:block;}
.wrap{max-width:1140px;margin:0 auto;padding:0 24px;}

/* ===== 顶部导航 ===== */
.header{position:sticky;top:0;z-index:50;background:#fff;border-bottom:1px solid var(--line);}
.nav{display:flex;align-items:center;justify-content:space-between;height:78px;position:relative;}
.nav .logo{height:46px;}
.nav-right{display:flex;align-items:center;gap:30px;}
.nav-menu{display:flex;gap:30px;list-style:none;font-size:15.5px;color:var(--ink-2);}
.nav-menu a{padding:6px 2px;position:relative;transition:color .2s;}
.nav-menu a:hover{color:var(--brand);}
.nav-menu a.active{color:var(--brand);font-weight:700;}
.nav-menu a.active::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;background:var(--brand);border-radius:2px;}
.lang-switch{display:flex;border:1px solid var(--line);border-radius:18px;overflow:hidden;font-size:13px;cursor:pointer;flex-shrink:0;}
.lang-switch span{padding:5px 14px;color:var(--ink-3);transition:.2s;}
.lang-switch span.active{background:var(--brand);color:#fff;}
.burger{display:none;width:26px;height:20px;flex-direction:column;justify-content:space-between;cursor:pointer;}
.burger span{height:2px;background:var(--ink);border-radius:2px;transition:.3s;}
.burger.open span:nth-child(1){transform:translateY(9px) rotate(45deg);}
.burger.open span:nth-child(2){opacity:0;}
.burger.open span:nth-child(3){transform:translateY(-9px) rotate(-45deg);}

/* ===== Hero ===== */
.hero{position:relative;height:460px;display:flex;align-items:center;overflow:hidden;color:#fff;}
.hero .bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.62);}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(115deg,rgba(15,58,114,.88) 0%,rgba(24,80,152,.72) 45%,rgba(24,80,152,.30) 100%);}
.hero-inner{position:relative;z-index:2;}
.hero h1{font-size:42px;line-height:1.35;font-weight:700;letter-spacing:1px;}
.hero .sub{margin-top:16px;font-size:17px;opacity:.9;letter-spacing:.5px;}
.hero .cta{display:inline-block;margin-top:30px;background:#fff;color:var(--brand);font-size:15px;font-weight:700;padding:12px 32px;border-radius:5px;letter-spacing:1px;transition:.2s;}
.hero .cta:hover{background:var(--brand-light);}

/* ===== 通用区块 ===== */
.section{padding:74px 0;}
.section-head{text-align:center;margin-bottom:48px;}
.section-head h2{font-size:28px;font-weight:700;}
.section-head .en{color:var(--ink-3);font-size:13px;letter-spacing:4px;margin-top:8px;text-transform:uppercase;}
.section-head .bar{width:40px;height:3px;background:var(--brand);margin:16px auto 0;border-radius:2px;}

/* 首页简介 */
.brief{display:flex;gap:48px;align-items:center;}
.brief .txt{flex:1;font-size:15.5px;line-height:2.1;color:var(--ink-2);text-align:justify;}
.brief .more{display:inline-block;margin-top:14px;color:var(--brand);font-weight:700;font-size:14.5px;}
.brief .pic{width:360px;height:230px;border-radius:10px;object-fit:cover;flex-shrink:0;box-shadow:0 10px 30px rgba(20,40,80,.12);}

/* 五大业务入口 */
.cards5{display:grid;grid-template-columns:repeat(5,1fr);gap:18px;}
.card{border:1px solid var(--line);border-radius:12px;padding:30px 16px;text-align:center;background:#fff;transition:.22s;cursor:default;}
.card:hover{box-shadow:0 10px 28px rgba(24,80,152,.14);transform:translateY(-5px);border-color:var(--brand);}
.card .ico{width:56px;height:56px;margin:0 auto 16px;border-radius:14px;background:var(--brand-light);color:var(--brand);display:flex;align-items:center;justify-content:center;}
.card .ico svg{width:30px;height:30px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;}
.card h3{font-size:16.5px;font-weight:700;}
.card p{font-size:11.5px;color:var(--ink-3);margin-top:6px;letter-spacing:.5px;}

/* 数据条 */
.stats{background:var(--brand);color:#fff;padding:36px 0;}
.stats .row{display:flex;justify-content:space-between;}
.stat b{font-size:30px;font-weight:700;display:block;}
.stat span{font-size:13px;opacity:.85;margin-top:4px;display:block;}

/* ===== 关于我们 ===== */
.about-cols{display:flex;gap:50px;align-items:center;}
.about-cols .txt{flex:1;font-size:15.5px;line-height:2.15;color:var(--ink-2);text-align:justify;}
.about-cols .pic{width:420px;height:300px;border-radius:12px;object-fit:cover;flex-shrink:0;box-shadow:0 10px 30px rgba(20,40,80,.12);}
.ability{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;width:440px;flex-shrink:0;}
.ab{border:1px solid var(--line);border-left:3px solid var(--brand);border-radius:8px;padding:20px 22px;background:#FBFCFE;}
.ab b{font-size:15px;display:block;margin-bottom:6px;}
.ab span{font-size:13px;color:var(--ink-3);line-height:1.8;display:block;}

/* ===== 产品服务（5板块交错） ===== */
.svc{display:flex;gap:44px;align-items:center;margin-bottom:56px;}
.svc:last-child{margin-bottom:0;}
.svc .pic{width:440px;height:280px;border-radius:12px;object-fit:cover;flex-shrink:0;box-shadow:0 10px 30px rgba(20,40,80,.12);}
.svc.rev .pic{order:2;}
.svc .body{flex:1;}
.svc .no{display:inline-block;font-family:Consolas,monospace;color:var(--brand);font-size:14px;font-weight:700;margin-bottom:10px;letter-spacing:1px;}
.svc h3{font-size:22px;font-weight:700;margin-bottom:5px;}
.svc .en-t{font-size:12px;color:var(--ink-3);letter-spacing:2px;margin-bottom:14px;text-transform:uppercase;}
.svc p{font-size:15px;line-height:2;color:var(--ink-2);}

/* ===== 联系我们 ===== */
.contact{display:flex;gap:46px;}
.c-info{flex:1;}
.c-item{display:flex;gap:16px;margin-bottom:24px;font-size:15.5px;color:var(--ink-2);line-height:1.9;}
.c-item .ic{width:44px;height:44px;border-radius:10px;background:var(--brand-light);color:var(--brand);display:flex;align-items:center;justify-content:center;flex-shrink:0;}
.c-item .ic svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;}
.c-item b{color:var(--ink);font-size:14px;display:block;margin-bottom:2px;}
.map{width:480px;height:320px;border-radius:12px;overflow:hidden;flex-shrink:0;border:1px solid var(--line);box-shadow:0 10px 30px rgba(20,40,80,.12);}
.map iframe{width:100%;height:100%;border:0;}

/* ===== 页脚 ===== */
.footer{background:#12253F;color:#B9C4D4;padding:42px 0 22px;font-size:13px;line-height:2;}
.footer .row{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;}
.footer b{color:#fff;font-size:15px;display:block;margin-bottom:8px;}
.footer .icp{border-top:1px solid rgba(255,255,255,.12);margin-top:24px;padding-top:16px;text-align:center;color:#7C8BA1;font-size:12.5px;}

/* ===== 响应式 ===== */
@media(max-width:980px){
  .brief,.about-cols,.contact{flex-direction:column;align-items:stretch;}
  .brief .pic,.about-cols .pic,.map{width:100%;height:240px;}
  .ability{width:100%;}
  .cards5{grid-template-columns:repeat(3,1fr);}
  .svc{flex-direction:column;gap:20px;}
  .svc.rev .pic{order:0;}
  .svc .pic{width:100%;height:240px;}
  .stats .row{flex-wrap:wrap;gap:20px;}
}
@media(max-width:860px){
  .burger{display:flex;}
  .nav-right{gap:14px;}
  .nav-menu{display:none;position:absolute;top:78px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);flex-direction:column;gap:0;padding:8px 24px 16px;box-shadow:0 12px 24px rgba(0,0,0,.08);}
  .nav-menu.open{display:flex;}
  .nav-menu a{padding:12px 0;border-bottom:1px solid var(--line);}
  .nav-menu a.active::after{display:none;}
  .hero{height:380px;}
  .hero h1{font-size:30px;}
  .cards5{grid-template-columns:repeat(2,1fr);}
  .section{padding:54px 0;}
}
@media(max-width:480px){
  .cards5{grid-template-columns:1fr;}
  .ability{grid-template-columns:1fr;}
  .hero h1{font-size:26px;}
}