:root{
    --navy:#1B2A41;
    --navy-deep:#122036;
    --navy-soft:#2A3B57;
    --gold:#C9A063;
    --gold-deep:#A8834A;
    --orange:#F0762B;
    --bg:#F4F6F9;
    --cream:#FAF6EF;
    --white:#FFFFFF;
    --text:#1B2A41;
    --muted:#5F6B7E;
    --radius:16px;
  }
  *{margin:0;padding:0;box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  body{
    font-family:"PingFang SC","Microsoft YaHei","Source Han Sans SC",system-ui,sans-serif;
    color:var(--text);background:var(--white);line-height:1.7;
  }
  img{max-width:100%;display:block;}
  a{text-decoration:none;color:inherit;}
  .container{max-width:1140px;margin:0 auto;padding:0 24px;}

  /* ===== 顶部导航 ===== */
  .nav{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.94);backdrop-filter:blur(10px);border-bottom:1px solid rgba(27,42,65,.08);}
  .nav-inner{display:flex;align-items:center;justify-content:space-between;height:78px;}
  .brand{display:flex;align-items:center;gap:14px;}
  .brand img{width:60px;height:60px;object-fit:contain;border-radius:12px;}
  .brand-name{font-size:20px;font-weight:700;color:var(--navy);letter-spacing:2px;}
  .brand-name small{font-size:11.5px;color:var(--muted);font-weight:400;letter-spacing:1.5px;display:block;line-height:1.4;}
  .nav-links{display:flex;gap:6px;align-items:center;}
  .nav-links a{
    font-size:15.5px;font-weight:500;color:var(--navy-soft);
    padding:9px 18px;border-radius:999px;letter-spacing:1px;
    transition:color .2s,background .2s;position:relative;
  }
  .nav-links a::before{
    content:"";display:inline-block;width:0;height:6px;border-radius:3px;
    background:var(--gold);margin-right:0;vertical-align:middle;
    transition:width .25s,margin-right .25s;
  }
  .nav-links a:hover{color:var(--navy);background:var(--cream);}
  .nav-links a:hover::before{width:14px;margin-right:8px;}
  .nav-cta{background:var(--navy);color:#fff;font-size:13.5px;padding:9px 20px;border-radius:999px;transition:background .2s;display:inline-block;}
  .nav-cta:hover{background:var(--navy-soft);}

  /* ===== 首屏（大气草原背景 banner） ===== */
  .hero{
    position:relative;overflow:hidden;color:#fff;
    min-height:600px;display:flex;align-items:center;
  }
  .hero-bg{position:absolute;inset:0;}
  .hero-bg img{width:100%;height:100%;object-fit:cover;}
  .hero-bg::after{
    content:"";position:absolute;inset:0;
    background:linear-gradient(180deg,rgba(18,32,54,.10) 0%,rgba(18,32,54,.18) 55%,rgba(18,32,54,.46) 100%);
  }
  .hero-inner{
    position:relative;z-index:2;display:grid;grid-template-columns:auto 1fr;
    gap:64px;align-items:center;padding:88px 0 84px;max-width:1140px;margin:0 auto;
  }
  .hero-side{display:flex;flex-direction:column;align-items:center;gap:22px;}
  .hero-logo{
    width:340px;height:340px;background:#102050;border-radius:32px;
    display:flex;align-items:center;justify-content:center;padding:30px;
    box-shadow:0 22px 54px rgba(0,0,0,.38),inset 0 0 0 1px rgba(201,160,99,.28);
  }
  .hero-logo img{width:100%;object-fit:contain;}
  .hero-content{text-align:left;}
  .hero-tag{
    display:inline-flex;align-items:center;gap:8px;
    background:rgba(18,32,54,.42);border:1px solid rgba(243,217,168,.8);
    color:#F3D9A8;font-size:13.5px;padding:7px 20px;border-radius:999px;
    margin-bottom:22px;letter-spacing:3px;backdrop-filter:blur(3px);
  }
  .hero-tag i{width:7px;height:7px;border-radius:50%;background:var(--gold);display:inline-block;}
  .hero h1{font-size:48px;line-height:1.3;font-weight:700;letter-spacing:3px;text-shadow:0 2px 8px rgba(0,0,0,.45),0 6px 28px rgba(0,0,0,.4);}
  .hero h1 em{font-style:normal;color:#F3D9A8;text-shadow:0 2px 10px rgba(0,0,0,.5);}
  .hero p.sub{margin:20px 0 0;font-size:16.5px;color:#fff;max-width:560px;text-shadow:0 2px 8px rgba(0,0,0,.55),0 4px 18px rgba(0,0,0,.4);}
  .hero-actions{margin-top:34px;display:flex;gap:16px;flex-wrap:wrap;}
  .btn-gold{background:var(--gold);color:#fff;padding:14px 36px;border-radius:999px;font-size:15.5px;letter-spacing:1px;transition:transform .2s,box-shadow .2s;display:inline-block;box-shadow:0 6px 18px rgba(0,0,0,.25);}
  .btn-gold:hover{transform:translateY(-2px);box-shadow:0 10px 26px rgba(0,0,0,.3);}
  .btn-ghost{border:1px solid rgba(255,255,255,.75);background:rgba(18,32,54,.30);color:#fff;padding:14px 36px;border-radius:999px;font-size:15.5px;letter-spacing:1px;transition:background .2s;display:inline-block;backdrop-filter:blur(3px);}
  .btn-ghost:hover{background:rgba(255,255,255,.14);}
  .hero-scroll{position:absolute;left:50%;bottom:22px;transform:translateX(-50%);z-index:2;color:rgba(255,255,255,.75);font-size:12px;letter-spacing:3px;text-align:center;}
  .hero-scroll::after{content:"";display:block;width:1.5px;height:26px;background:linear-gradient(rgba(255,255,255,.8),transparent);margin:8px auto 0;}

  /* ===== 通用 section ===== */
  section{padding:84px 0;}
  .sec-head{text-align:center;margin-bottom:52px;}
  .sec-kicker{display:inline-block;font-size:13px;letter-spacing:4px;color:var(--gold-deep);font-weight:600;margin-bottom:12px;}
  .sec-head h2{font-size:32px;font-weight:700;color:var(--navy);letter-spacing:2px;}
  .sec-head .line{width:52px;height:3px;background:var(--gold);border-radius:2px;margin:18px auto 0;}
  .sec-head p{margin-top:16px;color:var(--muted);font-size:15px;max-width:660px;margin-left:auto;margin-right:auto;}

  /* ===== 核心业务（首页首要位置） ===== */
  .biz{background:var(--bg);}
  .biz-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;}
  .biz-card{background:#fff;border-radius:var(--radius);padding:32px 26px;transition:transform .25s,box-shadow .25s;position:relative;overflow:hidden;}
  .biz-card::before{content:"";position:absolute;left:0;top:0;width:100%;height:4px;background:var(--navy);}
  .biz-card.accent::before{background:var(--gold);}
  .biz-card:hover{transform:translateY(-6px);box-shadow:0 16px 36px rgba(27,42,65,.12);}
  .biz-icon{width:52px;height:52px;border-radius:14px;background:var(--navy);display:flex;align-items:center;justify-content:center;margin-bottom:18px;}
  .biz-card.accent .biz-icon{background:var(--gold);}
  .biz-icon svg{width:26px;height:26px;stroke:#fff;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;}
  .biz-card h3{font-size:17px;color:var(--navy);font-weight:700;margin-bottom:10px;}
  .biz-card p{font-size:13.5px;color:var(--muted);}
  .biz-tags{margin-top:16px;display:flex;flex-wrap:wrap;gap:8px;}
  .biz-tags span{font-size:12px;color:var(--navy-soft);background:var(--bg);border:1px solid rgba(27,42,65,.1);padding:3px 10px;border-radius:999px;}

  /* ===== 主营产品 ===== */
  .prod-featured{
    display:grid;grid-template-columns:1fr 1fr;gap:0;background:var(--cream);
    border-radius:22px;overflow:hidden;margin-bottom:40px;border:1px solid rgba(168,131,74,.25);
  }
  .prod-featured .pic{position:relative;min-height:380px;}
  .prod-featured .pic img{width:100%;height:100%;object-fit:cover;position:absolute;inset:0;}
  .prod-featured .info{padding:48px 44px;display:flex;flex-direction:column;justify-content:center;}
  .prod-featured .badge{align-self:flex-start;background:var(--gold);color:#fff;font-size:12.5px;letter-spacing:2px;padding:5px 16px;border-radius:999px;margin-bottom:18px;}
  .prod-featured h3{font-size:26px;color:var(--navy);font-weight:700;letter-spacing:1px;}
  .prod-featured .spec{margin-top:8px;font-size:14px;color:var(--gold-deep);font-weight:600;}
  .prod-featured p.desc{margin-top:16px;font-size:14.5px;color:var(--muted);}
  .prod-feats{margin-top:18px;display:grid;gap:9px;}
  .prod-feats span{font-size:13.5px;color:var(--text);display:flex;gap:9px;align-items:baseline;}
  .prod-feats span::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--gold);flex:none;transform:translateY(-2px);}
  .prod-featured .price-row{margin-top:24px;display:flex;align-items:center;gap:16px;flex-wrap:wrap;}
  .price{font-size:22px;font-weight:700;color:var(--orange);}
  .price small{font-size:13px;color:var(--muted);font-weight:400;}
  .btn-buy{background:var(--navy);color:#fff;font-size:13.5px;padding:10px 22px;border-radius:999px;transition:background .2s;}
  .btn-buy:hover{background:var(--navy-soft);}

  .prod-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;}
  .prod-card{background:#fff;border:1px solid rgba(27,42,65,.08);border-radius:var(--radius);overflow:hidden;transition:transform .25s,box-shadow .25s;display:flex;flex-direction:column;}
  .prod-card:hover{transform:translateY(-6px);box-shadow:0 18px 40px rgba(27,42,65,.14);}
  .prod-card .pic{position:relative;aspect-ratio:1/1;overflow:hidden;background:var(--bg);}
  .prod-card .pic img{width:100%;height:100%;object-fit:cover;transition:transform .4s;}
  .prod-card:hover .pic img{transform:scale(1.05);}
  .prod-card .ptag{position:absolute;left:12px;top:12px;background:var(--navy);color:#fff;font-size:11.5px;padding:4px 12px;border-radius:999px;letter-spacing:1px;}
  .prod-card .body{padding:20px 20px 22px;display:flex;flex-direction:column;flex:1;}
  .prod-card h4{font-size:15.5px;color:var(--navy);font-weight:700;line-height:1.5;}
  .prod-card .spec{font-size:12.5px;color:var(--gold-deep);margin-top:4px;}
  .prod-card p{font-size:13px;color:var(--muted);margin-top:10px;flex:1;}
  .prod-card .ftags{display:flex;flex-wrap:wrap;gap:6px;margin-top:12px;}
  .prod-card .ftags span{font-size:11.5px;color:var(--navy-soft);background:var(--bg);padding:2px 9px;border-radius:999px;}
  .prod-card .price-row{margin-top:14px;display:flex;align-items:center;justify-content:space-between;}
  .prod-card .price{font-size:17px;}
  .prod-card .buy{font-size:12.5px;color:var(--gold-deep);border:1px solid rgba(168,131,74,.45);padding:5px 14px;border-radius:999px;transition:all .2s;}
  .prod-card .buy:hover{background:var(--gold);color:#fff;border-color:var(--gold);}

  /* ===== 关于我们 ===== */
  .about{background:#fff;border-top:1px solid rgba(27,42,65,.06);}
  .about-grid{display:grid;grid-template-columns:1fr 1fr;gap:52px;align-items:center;}
  .about-text h3{font-size:22px;color:var(--navy);margin-bottom:16px;font-weight:700;}
  .about-text p{color:var(--muted);font-size:14.5px;margin-bottom:13px;}
  .about-points{margin-top:22px;display:grid;gap:13px;}
  .about-point{display:flex;gap:12px;align-items:flex-start;}
  .about-point .dot{width:22px;height:22px;border-radius:50%;background:var(--navy);color:#fff;font-size:12px;display:flex;align-items:center;justify-content:center;flex:none;margin-top:3px;}
  .about-point b{font-size:14.5px;color:var(--navy);display:block;}
  .about-point span{font-size:13px;color:var(--muted);}
  .about-cards{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
  .about-card{background:#fff;border-radius:var(--radius);padding:26px 22px;border:1px solid rgba(27,42,65,.07);transition:transform .25s,box-shadow .25s;}
  .about-card:hover{transform:translateY(-4px);box-shadow:0 14px 32px rgba(27,42,65,.1);}
  .about-card .num{font-size:12px;color:var(--gold-deep);font-weight:700;letter-spacing:2px;}
  .about-card h4{font-size:15.5px;color:var(--navy);margin:7px 0 6px;font-weight:700;}
  .about-card p{font-size:12.5px;color:var(--muted);line-height:1.65;}

  /* ===== 联系我们 ===== */
  .contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:stretch;}
  .contact-info,.contact-form{display:flex;flex-direction:column;}
  .col-title{font-size:18px;color:var(--navy);font-weight:700;letter-spacing:1px;margin-bottom:20px;line-height:1.4;}
  .contact-rows{display:grid;gap:15px;align-content:start;flex:1;}
  .contact-row{display:flex;align-items:center;gap:16px;background:var(--bg);border-radius:14px;padding:15px 20px;}
  .contact-row .ico{width:42px;height:42px;border-radius:12px;background:var(--navy);flex:none;display:flex;align-items:center;justify-content:center;}
  .contact-row .ico svg{width:20px;height:20px;stroke:#fff;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;}
  .contact-row b{font-size:14px;color:var(--navy);display:block;}
  .contact-row span{font-size:13.5px;color:var(--muted);}
  .contact-row a{color:var(--navy-soft);border-bottom:1px dashed rgba(27,42,65,.3);}
  .contact-row a:hover{color:var(--gold-deep);border-color:var(--gold);}
  .shop-cta{
    margin-top:6px;display:flex;align-items:center;gap:16px;cursor:pointer;
    background:linear-gradient(90deg,#122036 0%,#1B2A41 55%,#2A3B57 100%);
    border-radius:16px;padding:18px 20px;color:#fff;
    box-shadow:0 12px 28px rgba(27,42,65,.22);transition:transform .22s,box-shadow .22s;
  }
  .shop-cta:hover{transform:translateY(-3px);box-shadow:0 18px 36px rgba(27,42,65,.3);}
  .shop-ico{width:46px;height:46px;border-radius:12px;background:var(--gold);flex:none;display:flex;align-items:center;justify-content:center;}
  .shop-ico svg{width:24px;height:24px;stroke:#122036;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;}
  .shop-txt{flex:1;min-width:0;}
  .shop-txt b{display:block;font-size:15px;letter-spacing:1px;}
  .shop-txt span{font-size:12.5px;color:#B9C4D6;}
  .shop-btn{background:var(--gold);color:#fff;font-size:13px;padding:8px 18px;border-radius:999px;flex:none;letter-spacing:1px;}
  .contact-form{background:var(--bg);border-radius:var(--radius);padding:34px 30px;}
  .contact-form form{display:flex;flex-direction:column;flex:1;}
  .form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:14px;}
  .contact-form input,.contact-form textarea{width:100%;border:1px solid rgba(27,42,65,.15);border-radius:10px;padding:12px 14px;font-size:14px;font-family:inherit;color:var(--text);background:#fff;outline:none;transition:border .2s;}
  .contact-form input:focus,.contact-form textarea:focus{border-color:var(--gold);}
  .contact-form textarea{resize:vertical;min-height:110px;flex:1;}
  .contact-form button[type=submit]{margin-top:6px;width:100%;background:var(--navy);color:#fff;border:none;padding:14px;border-radius:10px;font-size:15px;cursor:pointer;font-family:inherit;letter-spacing:2px;transition:background .2s;}
  .contact-form button[type=submit]:hover{background:var(--navy-soft);}
  /* 提交成功面板 */
  .form-done{display:none;flex:1;flex-direction:column;justify-content:center;text-align:center;padding:6px 0;}
  .form-done.show{display:flex;}
  .done-ico{width:56px;height:56px;border-radius:50%;background:rgba(59,109,17,.1);display:flex;align-items:center;justify-content:center;margin:0 auto 16px;}
  .done-ico svg{width:26px;height:26px;stroke:#3B6D11;fill:none;stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round;}
  .form-done b{font-size:17px;color:var(--navy);display:block;margin-bottom:10px;letter-spacing:1px;}
  .form-done p{font-size:13px;color:var(--muted);line-height:1.85;margin-bottom:20px;}
  .form-done .acts{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;}
  .form-done .acts button{border:none;border-radius:10px;padding:12px 22px;font-size:14px;font-family:inherit;cursor:pointer;background:var(--navy);color:#fff;transition:background .2s;}
  .form-done .acts button:hover{background:var(--navy-soft);}
  .form-done .acts button.ghost{background:#fff;color:var(--navy);border:1px solid rgba(27,42,65,.2);}
  .form-done .acts button.ghost:hover{background:#EDF0F5;}
  .form-done .again{display:inline-block;margin-top:18px;font-size:13px;color:var(--muted);border-bottom:1px dashed rgba(27,42,65,.3);cursor:pointer;}
  .form-done .again:hover{color:var(--gold-deep);border-color:var(--gold);}

  /* ===== 页脚 ===== */
  footer{background:var(--navy-deep);color:#8B99B0;padding:44px 0 30px;}
  .foot-inner{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px;}
  .foot-brand{display:flex;align-items:center;gap:12px;}
  .foot-brand img{width:48px;height:48px;background:#fff;border-radius:12px;padding:5px;object-fit:contain;}
  .foot-brand b{color:#fff;font-size:15px;letter-spacing:2px;display:block;}
  .foot-brand small{font-size:11px;letter-spacing:1px;color:var(--gold);}
  .foot-links{display:flex;gap:24px;font-size:13px;}
  .foot-links a:hover{color:#fff;}
  .foot-copy{margin-top:26px;border-top:1px solid rgba(255,255,255,.1);padding-top:20px;font-size:12px;text-align:center;}
  .foot-icp{margin-top:10px;font-size:12px;text-align:center;color:#7A879B;letter-spacing:.5px;}
  .foot-icp a{color:#8B99B0;}
  .foot-icp a:hover{color:var(--gold);}

  /* ===== 二维码弹窗 ===== */
  .qr-mask{position:fixed;inset:0;background:rgba(18,32,54,.62);z-index:200;display:none;align-items:center;justify-content:center;padding:24px;backdrop-filter:blur(4px);}
  .qr-mask.open{display:flex;}
  .qr-modal{background:#fff;border-radius:20px;padding:36px 34px 30px;max-width:340px;width:100%;text-align:center;position:relative;animation:pop .25s ease;}
  @keyframes pop{from{opacity:0;transform:scale(.94) translateY(10px);}to{opacity:1;transform:none;}}
  .qr-modal .close{
    position:absolute;right:14px;top:14px;width:32px;height:32px;border:none;border-radius:50%;
    background:var(--bg);color:var(--muted);font-size:16px;cursor:pointer;line-height:1;
  }
  .qr-modal .close:hover{background:#E8EAEF;}
  .qr-modal img.head{width:64px;border-radius:12px;margin:0 auto 12px;}
  .qr-modal h4{font-size:17px;color:var(--navy);font-weight:700;letter-spacing:1px;}
  .qr-modal .qr-box{margin:18px auto 14px;width:228px;height:228px;background:#fff;border:1px solid rgba(168,131,74,.35);border-radius:14px;display:flex;align-items:center;justify-content:center;overflow:hidden;box-shadow:0 4px 16px rgba(16,32,80,.06);}
  .qr-modal .qr-box img{width:100%;height:100%;object-fit:contain;}
  .qr-modal p{font-size:13px;color:var(--muted);line-height:1.7;}
  .qr-modal .tip{margin-top:12px;font-size:12px;color:var(--gold-deep);}

  /*===== 滚动浮现 ===== */
  .reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s ease;}
  .reveal.in{opacity:1;transform:none;}

  /* ===== 滚动浮现的兜底 =====
     ⚠️ 背景：.reveal 默认 opacity:0，必须靠 JS 加 .in 才显形。
        一旦 app.js 加载失败、被拦截或观察器未触发，整页内容会永久隐身，
        表现为「首屏下面一大片空白」。
        下面这条规则保证：JS 不可用时内容直接可见，优先级高于 .reveal 本身。
        JS 正常时 <html> 上的 no-js 会被内联脚本移除，动画效果照旧。 */
  html.no-js .reveal,
  html:not(.js) .reveal{opacity:1 !important;transform:none !important;}

  /* ===== 响应式 ===== */
  @media(max-width:960px){
    .hero{min-height:520px;}
    .hero-inner{grid-template-columns:1fr;gap:36px;padding:60px 24px 72px;justify-items:center;text-align:center;}
    .hero-content{text-align:center;}
    .hero-side{gap:18px;}
    .hero-logo{width:220px;height:220px;padding:20px;border-radius:26px;}
    .hero h1{font-size:34px;letter-spacing:2px;}
    .hero-actions{justify-content:center;}
    .biz-grid{grid-template-columns:repeat(2,1fr);}
    .prod-grid{grid-template-columns:repeat(2,1fr);}
    .prod-featured{grid-template-columns:1fr;}
    .prod-featured .pic{min-height:300px;}
    .about-grid{grid-template-columns:1fr;}
    .contact-grid{grid-template-columns:1fr;}
    .nav-links{display:none;}
  }
  @media(max-width:560px){
    .biz-grid{grid-template-columns:1fr;}
    .prod-grid{grid-template-columns:1fr;}
    .about-cards{grid-template-columns:1fr;}
    .form-row{grid-template-columns:1fr;}
    .prod-featured .info{padding:32px 26px;}
  }