:root{
    --primary:#1a56db;
    --primary-dark:#1446b8;
    --teal:#0e7490;
    --teal-light:#e6f4f7;
    --bg:#f4f7fb;
    --card:#ffffff;
    --text:#1f2937;
    --muted:#5b6b7f;
    --border:#e2e8f0;
    --shadow:0 4px 18px rgba(20,60,140,.08);
  }
  *{margin:0;padding:0;box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  body{
    font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",sans-serif;
    color:var(--text);
    background:var(--bg);
    line-height:1.7;
    -webkit-font-smoothing:antialiased;
  }
  a{color:inherit;text-decoration:none;}
  .container{max-width:1180px;margin:0 auto;padding:0 24px;}

  /* ===== 顶部导航 ===== */
  header.nav{
    position:sticky;top:0;z-index:100;
    background:rgba(255,255,255,.95);
    backdrop-filter:blur(8px);
    border-bottom:1px solid var(--border);
  }
  .nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px;}
  .brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:18px;color:var(--primary);}
  .brand svg{flex:none;}
  .brand small{font-size:12px;color:var(--muted);font-weight:400;}
  nav.menu{display:flex;gap:6px;align-items:center;}
  nav.menu a{
    padding:8px 14px;border-radius:8px;font-size:15px;color:var(--text);
    transition:background .2s,color .2s;
  }
  nav.menu a:hover{background:var(--teal-light);color:var(--teal);}
  .nav-cta{
    background:var(--primary);color:#fff !important;border-radius:8px;
    padding:8px 16px !important;font-weight:500;
  }
  .nav-cta:hover{background:var(--primary-dark) !important;}
  .hamburger{
    display:none;background:none;border:1px solid var(--border);border-radius:8px;
    width:44px;height:44px;cursor:pointer;align-items:center;justify-content:center;
  }
  .mobile-menu{display:none;flex-direction:column;padding:8px 24px 16px;gap:2px;background:#fff;border-bottom:1px solid var(--border);}
  .mobile-menu a{padding:10px 6px;border-radius:8px;font-size:15px;}
  .mobile-menu a:hover{background:var(--teal-light);}
  .mobile-menu.open{display:flex;}

  /* ===== Hero ===== */
  .hero{
    background:linear-gradient(135deg,#0f2f6e 0%,#1a56db 55%,#0e7490 100%);
    color:#fff;padding:90px 0 100px;position:relative;overflow:hidden;
  }
  .hero::after{
    content:"";position:absolute;right:-120px;top:-120px;width:420px;height:420px;
    border-radius:50%;background:rgba(255,255,255,.06);
  }
  .hero::before{
    content:"";position:absolute;left:-80px;bottom:-160px;width:360px;height:360px;
    border-radius:50%;background:rgba(255,255,255,.05);
  }
  .hero-inner{position:relative;z-index:1;max-width:780px;}
  .hero .eyebrow{
    display:inline-block;font-size:13px;letter-spacing:2px;
    background:rgba(255,255,255,.15);padding:5px 14px;border-radius:999px;margin-bottom:20px;
  }
  .hero h1{font-size:42px;line-height:1.25;font-weight:700;margin-bottom:18px;}
  .hero p.lead{font-size:17px;color:rgba(255,255,255,.9);margin-bottom:36px;max-width:640px;}
  .hero-actions{display:flex;gap:14px;flex-wrap:wrap;}
  .btn{
    display:inline-flex;align-items:center;gap:8px;
    padding:12px 26px;border-radius:10px;font-size:15px;font-weight:500;cursor:pointer;
    border:none;transition:transform .15s,box-shadow .2s;
  }
  .btn-primary{background:#fff;color:var(--primary-dark);}
  .btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 20px rgba(0,0,0,.18);}
  .btn-ghost{background:transparent;color:#fff;border:1.5px solid rgba(255,255,255,.6);}
  .btn-ghost:hover{background:rgba(255,255,255,.12);}

  .selling-points{
    display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:52px;position:relative;z-index:1;
  }
  .sp{
    background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.2);
    border-radius:14px;padding:20px;backdrop-filter:blur(4px);
  }
  .sp .icon{
    width:40px;height:40px;border-radius:10px;background:rgba(255,255,255,.18);
    display:flex;align-items:center;justify-content:center;margin-bottom:12px;
  }
  .sp h3{font-size:16px;margin-bottom:6px;}
  .sp p{font-size:13px;color:rgba(255,255,255,.82);line-height:1.6;}

  /* ===== 通用区块 ===== */
  section{padding:76px 0;}
  .sec-head{text-align:center;max-width:680px;margin:0 auto 44px;}
  .sec-head .tag{
    color:var(--teal);font-size:13px;font-weight:600;letter-spacing:2px;text-transform:uppercase;
  }
  .sec-head h2{font-size:30px;margin:8px 0 12px;color:var(--text);}
  .sec-head p{color:var(--muted);font-size:15px;}

  /* ===== 产品列表 ===== */
  #products{background:#fff;}
  .table-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:14px;box-shadow:var(--shadow);}
  table.products{
    width:100%;border-collapse:collapse;table-layout:fixed;background:#fff;
  }
  table.products th,table.products td{
    padding:14px 16px;text-align:left;font-size:14px;vertical-align:top;
    word-wrap:break-word;overflow-wrap:break-word;
  }
  table.products thead th{
    background:linear-gradient(135deg,#1a56db,#0e7490);color:#fff;font-weight:600;font-size:13.5px;
  }
  table.products tbody tr{border-top:1px solid var(--border);}
  table.products tbody tr:hover{background:#f4f9ff;}
  table.products td .pname{font-weight:600;color:var(--primary-dark);}
  table.products td .cat{
    display:inline-block;background:var(--teal-light);color:var(--teal);
    padding:2px 10px;border-radius:999px;font-size:12px;
  }
  table.products td .price{font-weight:600;color:var(--teal);}
  table.products td a.src{color:var(--primary);text-decoration:underline;font-size:13px;word-break:break-all;}
  .demo-note{
    margin-top:14px;font-size:13px;color:var(--muted);
    background:#fff8e6;border:1px dashed #e8c86a;border-radius:10px;padding:10px 14px;
  }

  /* 移动端卡片 */
  .product-cards{display:none;flex-direction:column;gap:16px;}
  .pcard{
    background:var(--card);border:1px solid var(--border);border-radius:14px;
    padding:18px;box-shadow:var(--shadow);
  }
  .pcard .top{display:flex;justify-content:space-between;align-items:flex-start;gap:10px;margin-bottom:10px;}
  .pcard .pname{font-weight:700;color:var(--primary-dark);font-size:16px;}
  .pcard .cat{background:var(--teal-light);color:var(--teal);padding:2px 10px;border-radius:999px;font-size:12px;white-space:nowrap;}
  .pcard .row{display:flex;font-size:13.5px;color:var(--muted);margin-top:6px;}
  .pcard .row b{color:var(--text);min-width:64px;font-weight:500;}
  .pcard .price{color:var(--teal);font-weight:600;}

  /* ===== 关于 / 优势 ===== */
  #about{background:var(--bg);}
  .adv-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-bottom:48px;}
  .adv{
    background:#fff;border-radius:14px;padding:26px;box-shadow:var(--shadow);
    border-top:3px solid var(--primary);
  }
  .adv:nth-child(2){border-top-color:var(--teal);}
  .adv:nth-child(3){border-top-color:#2b7a9e;}
  .adv .icon{
    width:44px;height:44px;border-radius:12px;background:var(--teal-light);
    display:flex;align-items:center;justify-content:center;margin-bottom:14px;
  }
  .adv h3{font-size:17px;margin-bottom:8px;}
  .adv p{font-size:14px;color:var(--muted);}

  .process{
    background:#fff;border-radius:14px;padding:36px 28px;box-shadow:var(--shadow);
  }
  .process h3{text-align:center;font-size:19px;margin-bottom:28px;}
  .steps{display:grid;grid-template-columns:repeat(6,1fr);gap:0;align-items:start;}
  .step{text-align:center;position:relative;padding:0 6px;}
  .step .dot{
    width:38px;height:38px;border-radius:50%;background:var(--primary);color:#fff;
    display:flex;align-items:center;justify-content:center;margin:0 auto 10px;font-weight:600;font-size:15px;
    position:relative;z-index:1;
  }
  .step:not(:last-child)::after{
    content:"";position:absolute;top:19px;left:calc(50% + 22px);width:calc(100% - 44px);height:2px;
    background:linear-gradient(90deg,var(--primary),var(--teal));
  }
  .step .lbl{font-size:13.5px;font-weight:600;}
  .step .desc{font-size:12px;color:var(--muted);margin-top:4px;line-height:1.5;}

  /* ===== 联系我们 ===== */
  #contact{background:#fff;}
  .contact-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:32px;align-items:start;}
  .citem{
    display:flex;gap:16px;align-items:flex-start;padding:18px;
    border:1px solid var(--border);border-radius:12px;margin-bottom:14px;background:var(--bg);
  }
  .citem .icon{
    width:42px;height:42px;flex:none;border-radius:10px;background:var(--primary);
    display:flex;align-items:center;justify-content:center;
  }
  .citem .k{font-size:13px;color:var(--muted);}
  .citem .v{font-size:16px;font-weight:600;color:var(--text);}

  /* ===== 微信二维码占位 ===== */
  .qr-blocks{display:grid;grid-template-columns:1fr 1fr;gap:20px;}
  .qr-card{
    border:1px solid var(--border);border-radius:14px;padding:22px;text-align:center;background:var(--bg);
  }
  .qr-card h4{font-size:15px;margin-bottom:14px;color:var(--text);}
  .qr-box{
    width:150px;height:150px;margin:0 auto;
    border:2px dashed #9db4d0;border-radius:12px;background:#fff;
    display:flex;align-items:center;justify-content:center;text-align:center;
    color:#8aa0bd;font-size:13px;line-height:1.6;white-space:pre-line;
  }
  .qr-card .note{font-size:12.5px;color:var(--muted);margin-top:12px;}

  /* ===== 页脚 ===== */
  footer{
    background:#0f2547;color:#c8d6ea;padding:36px 0;font-size:13.5px;
  }
  footer .foot-inner{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;}
  footer a{color:#fff;}
  footer a:hover{text-decoration:underline;}
  footer .brand-f{color:#fff;font-weight:700;font-size:16px;margin-bottom:6px;}

  /* ===== Toast ===== */
  #toast{
    position:fixed;left:50%;bottom:40px;transform:translateX(-50%) translateY(20px);
    background:rgba(15,37,71,.94);color:#fff;padding:12px 22px;border-radius:10px;
    font-size:14px;opacity:0;pointer-events:none;transition:all .3s;z-index:999;
  }
  #toast.show{opacity:1;transform:translateX(-50%) translateY(0);}

  /* ===== 响应式 ===== */
  @media (max-width:1023px){
    .hero h1{font-size:34px;}
    .adv-grid{grid-template-columns:1fr;}
    .steps{grid-template-columns:repeat(3,1fr);row-gap:26px;}
    .step:nth-child(3)::after{display:none;}
  }
  @media (max-width:767px){
    nav.menu{display:none;}
    .hamburger{display:flex;}
    .hero{padding:60px 0 70px;}
    .hero h1{font-size:28px;}
    .hero p.lead{font-size:15px;}
    .selling-points{grid-template-columns:1fr;}
    .table-wrap{display:none;}
    .product-cards{display:flex;}
    .steps{grid-template-columns:repeat(2,1fr);row-gap:24px;}
    .step:nth-child(2)::after,.step:nth-child(4)::after{display:none;}
    .step:nth-child(3)::after{display:block;}
    .contact-grid{grid-template-columns:1fr;}
    .qr-blocks{grid-template-columns:1fr;}
    .sec-head h2{font-size:24px;}
    section{padding:56px 0;}
  }