/* 长光启腾（长春）科技有限公司 — 官网样式
   军工航天电装风格：深蓝 + 钢灰 + 科技点缀，响应式 */
:root{
  --navy:#0b2545;
  --navy-2:#13315c;
  --navy-3:#1c4677;
  --blue:#1d6fb8;
  --blue-2:#2e9bd6;
  --gold:#c9a227;
  --steel:#5b6b7b;
  --bg:#f4f6f9;
  --bg-2:#eaeff5;
  --white:#ffffff;
  --ink:#1a2330;
  --ink-2:#46566a;
  --line:#d9e1ea;
  --ok:#1f9d6b;
  --shadow:0 6px 22px rgba(11,37,69,.08);
  --shadow-2:0 12px 36px rgba(11,37,69,.14);
  --radius:14px;
  --maxw:1180px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"Microsoft YaHei","PingFang SC","Hiragino Sans GB","Source Han Sans CN",-apple-system,"Segoe UI",Roboto,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.7;font-size:16px;-webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px}
.muted{color:var(--ink-2)}

/* ---------- 顶部条 ---------- */
.topbar{background:var(--navy);color:#cfe0f0;font-size:13px}
.topbar .wrap{display:flex;justify-content:space-between;align-items:center;min-height:38px;height:auto;padding-top:5px;padding-bottom:5px;flex-wrap:wrap;gap:4px 8px}
.topbar .wrap > div:not(.rgt){flex:1 1 260px;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.topbar a{color:#9fc4e6}
.topbar a:hover{color:#fff}
.topbar .rgt{display:flex;gap:18px;flex-wrap:wrap}

/* ---------- 导航 ---------- */
header.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);
  backdrop-filter:saturate(150%) blur(8px);border-bottom:1px solid var(--line);box-shadow:0 2px 10px rgba(11,37,69,.05)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:66px}
.brand{display:flex;align-items:center;gap:12px;font-weight:800;color:var(--navy);font-size:18px;letter-spacing:.3px}
.brand .logo{width:38px;height:38px;border-radius:9px;background:linear-gradient(135deg,var(--navy),var(--blue-2));
  display:flex;align-items:center;justify-content:center;color:#fff;font-size:18px;flex:none;
  box-shadow:0 4px 12px rgba(29,111,184,.35)}
.brand .logo-img{height:61px;width:auto;max-width:280px;border-radius:10px;flex:none;object-fit:contain;background:#fff;padding:4px}
footer.ft .brand .logo-img{height:54px}
.brand small{display:block;font-weight:500;color:var(--steel);font-size:11.5px;letter-spacing:0}
.nav .menu{display:flex;gap:4px;align-items:center}
.nav .menu a{padding:9px 14px;border-radius:8px;color:var(--ink-2);font-weight:600;font-size:15px;transition:.18s}
.nav .menu a:hover{color:var(--navy);background:var(--bg-2)}
.nav .menu a.active{color:var(--navy);background:#e8f1fa}
.nav .cta{background:var(--gold);color:#1a1404;padding:9px 18px;border-radius:9px;font-weight:800;font-size:14.5px;
  box-shadow:0 4px 14px rgba(201,162,39,.35);transition:.18s}
.nav .cta:hover{transform:translateY(-1px);box-shadow:0 7px 20px rgba(201,162,39,.45)}
.nav-toggle{display:none}
.nav-toggle-label{display:none;cursor:pointer;width:42px;height:42px;border-radius:9px;align-items:center;justify-content:center}
.nav-toggle-label span,.nav-toggle-label span::before,.nav-toggle-label span::after{
  content:"";display:block;width:22px;height:2.5px;background:var(--navy);position:relative;transition:.2s}
.nav-toggle-label span::before{position:absolute;top:-7px}
.nav-toggle-label span::after{position:absolute;top:7px}

/* ---------- Hero ---------- */
.hero{position:relative;color:#fff;overflow:hidden;
  background:radial-gradient(1200px 500px at 80% -10%,rgba(46,155,214,.35),transparent 60%),
             linear-gradient(135deg,var(--navy) 0%,var(--navy-3) 100%)}
.hero::after{content:"";position:absolute;inset:0;opacity:.10;
  background-image:linear-gradient(rgba(255,255,255,.5) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.5) 1px,transparent 1px);
  background-size:42px 42px;mask-image:linear-gradient(180deg,#000,transparent)}
.hero .wrap{position:relative;z-index:2;padding:74px 22px 64px}
.hero .eyebrow{display:inline-block;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.22);
  padding:6px 14px;border-radius:999px;font-size:13px;letter-spacing:1px;margin-bottom:18px;color:#cfe6f7}
.hero h1{font-size:40px;line-height:1.25;font-weight:900;letter-spacing:.5px;max-width:820px}
.hero h1 .hl{color:var(--blue-2)}
.hero p.sub{margin-top:18px;font-size:17px;color:#d3e3f2;max-width:720px}
.hero .acts{margin-top:30px;display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 26px;border-radius:10px;font-weight:800;font-size:15.5px;transition:.18s;cursor:pointer}
.btn-gold{background:var(--gold);color:#1a1404;box-shadow:0 6px 18px rgba(201,162,39,.4)}
.btn-gold:hover{transform:translateY(-2px)}
.btn-ghost{border:1.5px solid rgba(255,255,255,.5);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.12)}
.hero .stat{margin-top:40px;display:flex;gap:34px;flex-wrap:wrap}
.hero .stat div b{font-size:26px;color:#fff;display:block;font-weight:900}
.hero .stat div span{font-size:13px;color:#a9c4dd}

/* ---------- 区块 ---------- */
.section{padding:60px 0}
.section.alt{background:var(--white);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section h2{font-size:27px;color:var(--navy);font-weight:900;letter-spacing:.4px;position:relative;padding-left:16px}
.section h2::before{content:"";position:absolute;left:0;top:6px;bottom:6px;width:5px;border-radius:3px;background:var(--blue-2)}
.section .lead{color:var(--ink-2);margin:12px 0 30px;max-width:780px}
.grid{display:grid;gap:22px}
.grid.cols-2{grid-template-columns:repeat(2,1fr)}
.grid.cols-3{grid-template-columns:repeat(3,1fr)}
.grid.cols-4{grid-template-columns:repeat(4,1fr)}

.card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow);transition:.2s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-2);border-color:#bcd3e8}
.card .ic{width:50px;height:50px;border-radius:12px;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,var(--navy),var(--blue));color:#fff;font-size:24px;font-weight:800;margin-bottom:16px}
.card h3{font-size:18.5px;color:var(--navy);margin-bottom:8px}
.card p{color:var(--ink-2);font-size:14.7px}
.card .more{display:inline-block;margin-top:14px;color:var(--blue);font-weight:700;font-size:14px}
.card .more:hover{color:var(--navy-3)}

/* 服务区域地图示意 */
.map{background:var(--bg-2);border:1px solid var(--line);border-radius:var(--radius);padding:30px}
.map .regions{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.map .region h4{color:var(--navy);font-size:17px;margin-bottom:10px;border-bottom:2px solid var(--blue-2);padding-bottom:6px;display:inline-block}
.map .region a{display:block;padding:5px 0;color:var(--ink-2);font-size:14.5px}
.map .region a:hover{color:var(--blue);padding-left:6px}

/* 列表 */
.ul-check{list-style:none;display:grid;gap:10px}
.ul-check li{padding-left:28px;position:relative;color:var(--ink-2)}
.ul-check li::before{content:"✓";position:absolute;left:0;top:0;width:20px;height:20px;border-radius:50%;
  background:#e8f5ee;color:var(--ok);display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:900}
.ul-check li b{color:var(--ink)}

/* 资质/案例 占位卡 */
.tile{background:var(--bg-2);border:1px dashed #c2cfdd;border-radius:12px;padding:22px;color:var(--steel);font-size:14px;min-height:120px;
  display:flex;flex-direction:column;justify-content:center;gap:6px}
.tile b{color:var(--navy)}
.tile.img{border-style:solid;padding:0;overflow:hidden;background:var(--white)}
.tile.img img{width:100%;height:150px;object-fit:cover}
.tile.img span{display:block;padding:10px 14px;color:var(--navy);font-weight:700;font-size:14px}

/* 面包屑 */
.crumb{background:var(--bg-2);border-bottom:1px solid var(--line);font-size:13px;color:var(--steel)}
.crumb .wrap{padding:11px 22px;display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.crumb a:hover{color:var(--blue)}
.crumb .sep{color:#aab8c7}

/* 内容页通用排版 */
.page-head{background:linear-gradient(135deg,var(--navy),var(--navy-3));color:#fff;padding:46px 0 40px}
.page-head h1{font-size:30px;font-weight:900;letter-spacing:.4px}
.page-head p{color:#cfe0f0;margin-top:10px;max-width:760px;font-size:15.5px}
.prose{max-width:860px}
.prose h3{color:var(--navy);font-size:20px;margin:30px 0 12px;padding-left:12px;border-left:4px solid var(--blue-2)}
.prose p{color:var(--ink-2);margin-bottom:14px}
.prose ul{margin:0 0 16px 20px;color:var(--ink-2)}
.prose ul li{margin-bottom:7px}

/* 联系信息条 */
.info-row{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:8px}
.info-row .it{background:var(--white);border:1px solid var(--line);border-radius:12px;padding:20px}
.info-row .it .k{font-size:13px;color:var(--steel)}
.info-row .it .v{font-size:17px;color:var(--navy);font-weight:800;margin-top:4px}
.tel{color:var(--gold)!important}

/* 侧栏/通栏提示 */
.note{background:#fff8e6;border:1px solid #f0dca0;border-radius:10px;padding:14px 16px;color:#7a5e10;font-size:13.5px;margin:18px 0}

/* 页脚 */
footer.ft{background:var(--navy);color:#bcd0e4;padding:46px 0 24px;font-size:14px}
footer.ft .cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:30px}
footer.ft h5{color:#fff;font-size:15px;margin-bottom:14px;letter-spacing:.5px}
footer.ft a{color:#9fc0dd;display:block;padding:4px 0}
footer.ft a:hover{color:#fff}
footer.ft .brand{color:#fff;margin-bottom:12px}
footer.ft .brand small{color:#9fc0dd}
footer.ft .copy{border-top:1px solid rgba(255,255,255,.12);margin-top:30px;padding-top:18px;font-size:12.5px;color:#7e98b3;line-height:1.9}
footer.ft .copy a{display:inline;color:#9fc0dd}
footer.ft .lang-switch{margin-top:12px}
footer.ft .lang-switch a,footer.ft .lang-switch b{color:#cfe0f0;font-size:13px;font-weight:600;font-family:inherit}
footer.ft .lang-switch a:hover{color:#fff}
footer.ft .icp{color:#c9a227}

/* 顶部语言切换按钮（所有页面可见，含中文） */
.topbar .rgt{display:flex;gap:14px;flex-wrap:wrap;align-items:center}
.lang-switch-top{display:flex;gap:6px;align-items:center;flex-wrap:wrap}
.lang-switch-top .lang-btn{display:inline-block;padding:3px 9px;border:1px solid rgba(159,196,230,.55);border-radius:999px;color:#cfe0f0;font-size:12px;font-weight:600;line-height:1.4;white-space:nowrap;transition:background .15s,color .15s,border-color .15s}
.lang-switch-top .lang-btn:hover{background:#fff;color:var(--navy);border-color:#fff}
.lang-switch-top b[aria-current="true"]{display:inline-block;padding:3px 9px;border-radius:999px;background:var(--gold);color:#1a1a1a;font-size:12px;font-weight:700;white-space:nowrap}
@media (max-width:560px){
  .topbar .wrap{min-height:38px;height:auto;padding-top:6px;padding-bottom:6px}
  .lang-switch-top .lang-btn,.lang-switch-top b[aria-current="true"]{padding:2px 7px;font-size:11px}
}

/* 语言推荐横幅：检测位置后推荐，用户手动选择，不自动跳转 */
.lang-rec-banner{display:flex;gap:14px;align-items:center;flex-wrap:wrap;background:var(--navy);color:#eaf2fb;
  padding:10px 18px;font-size:14px;position:relative;z-index:70;box-shadow:0 2px 10px rgba(0,0,0,.18)}
.lang-rec-banner .lr-msg{flex:1 1 auto;min-width:180px;line-height:1.5}
.lang-rec-banner .lr-yes{background:var(--gold);color:#1a1404;border:none;border-radius:999px;font-weight:800;
  padding:7px 16px;cursor:pointer;font-size:13px;white-space:nowrap;font-family:inherit}
.lang-rec-banner .lr-yes:hover{filter:brightness(1.06)}
.lang-rec-banner .lr-no{background:transparent;color:#cfe0f0;border:1px solid rgba(159,196,230,.5);border-radius:999px;
  padding:7px 14px;cursor:pointer;font-size:13px;white-space:nowrap;font-family:inherit}
.lang-rec-banner .lr-no:hover{color:#fff;border-color:#fff}
.lang-rec-banner .lr-x{background:transparent;border:none;color:#9fc0dd;font-size:20px;line-height:1;cursor:pointer;padding:0 4px}
.lang-rec-banner .lr-x:hover{color:#fff}
@media (max-width:560px){
  .lang-rec-banner{padding:9px 14px;font-size:13px;gap:10px}
  .lang-rec-banner .lr-yes,.lang-rec-banner .lr-no{padding:6px 12px;font-size:12px}
}

/* 浮动咨询 */
.fab{position:fixed;right:22px;bottom:22px;z-index:60;background:var(--gold);color:#1a1404;font-weight:800;
  padding:13px 20px;border-radius:999px;box-shadow:0 8px 24px rgba(201,162,39,.5);display:flex;align-items:center;gap:8px;font-size:15px}
.fab:hover{transform:translateY(-2px)}

/* 选题/列表（技术科普） */
.topic-list{columns:2;column-gap:30px}

/* 响应式 */
@media(max-width:980px){
  .grid.cols-4{grid-template-columns:repeat(2,1fr)}
  .grid.cols-3{grid-template-columns:repeat(2,1fr)}
  .map .regions{grid-template-columns:1fr}
  footer.ft .cols{grid-template-columns:1fr 1fr}
}
@media(max-width:760px){
  /* 顶部条 */
  .topbar .wrap{height:auto;padding-top:7px;padding-bottom:7px;justify-content:center;gap:6px 16px}
  .topbar{font-size:12px}
  .topbar .rgt{gap:14px}
  /* 汉堡菜单 */
  .nav .menu{position:absolute;top:66px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;
    padding:8px 18px 16px;border-bottom:1px solid var(--line);box-shadow:var(--shadow-2);
    display:none;max-height:calc(100vh - 66px);overflow:auto}
  .nav-toggle:checked ~ .menu{display:flex}
  .nav .menu a{padding:13px 6px;border-bottom:1px solid var(--bg-2);font-size:16px}
  .nav .cta{text-align:center;margin-top:10px}
  .nav-toggle-label{display:flex}
  .nav-toggle:checked ~ .nav-toggle-label span{background:transparent}
  .nav-toggle:checked ~ .nav-toggle-label span::before{top:0;transform:rotate(45deg)}
  .nav-toggle:checked ~ .nav-toggle-label span::after{top:0;transform:rotate(-45deg)}
  /* 栅格 */
  .grid.cols-2,.grid.cols-3,.grid.cols-4{grid-template-columns:1fr}
  .info-row{grid-template-columns:1fr}
  .section{padding:44px 0}
  .section h2{font-size:23px}
  .section .lead{font-size:15px}
  /* 页头 */
  .page-head{padding:34px 0 30px}
  .page-head h1{font-size:24px}
  .page-head p{font-size:14.5px}
  /* 卡片 / 地图 */
  .card{padding:20px}
  .map{padding:20px}
  .map .regions{gap:18px}
  /* 统计 */
  .hero h1{font-size:30px}
  .hero .stat{display:grid;grid-template-columns:repeat(2,1fr);gap:18px 12px}
  .hero .stat div b{font-size:23px}
  /* 列表 */
  .topic-list{columns:1}
  /* 页脚 */
  footer.ft{padding:38px 0 22px}
  footer.ft .cols{grid-template-columns:1fr}
  /* 浮动按钮 */
  .fab{right:14px;bottom:14px;padding:11px 16px;font-size:14px}
}
@media(max-width:480px){
  .wrap{padding:0 16px}
  .hero .wrap{padding:54px 16px 46px}
  .hero h1{font-size:25px}
  .hero p.sub{font-size:15px}
  .hero .acts{flex-direction:column;align-items:stretch}
  .hero .acts .btn{justify-content:center;width:100%}
  .brand small{display:none}
  .topbar .wrap > div:not(.rgt){display:none}
  .section h2{font-size:21px}
  .card h3{font-size:17px}
}