:root{
    --red:#e8152b;
    --red-dark:#b80f21;
    --red-deep:#8c0b19;
    --orange:#ff5a2e;
    --ink:#1a1214;
    --gray:#6b6467;
    --line:#f0dfe1;
    --bg:#fff;
    --bg-soft:#fff6f5;
    --shadow:0 8px 30px rgba(232,21,43,.10);
    --radius:16px;
  }
  *{box-sizing:border-box;margin:0;padding:0;}
  html{scroll-behavior:smooth;}
  body{
    font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Source Han Sans SC",system-ui,-apple-system,sans-serif;
    color:var(--ink);
    background:var(--bg);
    line-height:1.7;
    -webkit-font-smoothing:antialiased;
  }
  a{color:inherit;text-decoration:none;}
  img{max-width:100%;display:block;}
  .container{max-width:1200px;margin:0 auto;padding:0 24px;}
  .btn{
    display:inline-flex;align-items:center;justify-content:center;gap:8px;
    padding:13px 30px;border-radius:999px;font-size:15px;font-weight:600;
    border:none;cursor:pointer;transition:transform .25s,box-shadow .25s,background .25s;
  }
  .btn-primary{background:linear-gradient(135deg,var(--red),var(--orange));color:#fff;box-shadow:0 8px 22px rgba(232,21,43,.35);}
  .btn-primary:hover{transform:translateY(-3px);box-shadow:0 12px 30px rgba(232,21,43,.45);}
  .btn-ghost{background:#fff;color:var(--red);border:2px solid var(--red);}
  .btn-ghost:hover{background:var(--red);color:#fff;transform:translateY(-3px);}

  /* ===== Header ===== */
  header.site-header{
    position:sticky;top:0;z-index:100;
    background:rgba(255,255,255,.94);backdrop-filter:blur(12px);
    border-bottom:1px solid var(--line);
  }
  .header-inner{display:flex;align-items:center;justify-content:space-between;height:72px;}
  .brand{display:flex;align-items:center;gap:10px;}
  .ai-page-logo{height:40px;width:auto;max-width:100%;}
  .brand-name{font-size:20px;font-weight:800;color:var(--red-deep);letter-spacing:1px;}
  nav.nav{margin-left:auto;}
  .nav-links{display:flex;align-items:center;gap:0;list-style:none;flex-wrap:wrap;}
  .nav-links a{padding:8px 12px;font-size:14px;color:var(--ink);border-radius:8px;transition:.2s;}
  .nav-links a:hover{color:var(--red);background:var(--bg-soft);}
  .header-cta{display:flex;align-items:center;gap:12px;margin-left:16px;}
  .header-cta .btn{padding:9px 20px;font-size:14px;}
  .ai-page-home-link{padding:8px 12px;font-size:14px;color:var(--red);font-weight:600;}
  .menu-toggle{display:none;background:none;border:none;font-size:26px;color:var(--red);cursor:pointer;}

  /* ===== Hero ===== */
  .hero{
    position:relative;overflow:hidden;
    background:
      radial-gradient(circle at 85% 15%,rgba(255,90,46,.18),transparent 45%),
      radial-gradient(circle at 10% 90%,rgba(232,21,43,.16),transparent 40%),
      linear-gradient(160deg,#fff8f6 0%,#ffffff 60%);
    padding:80px 0 90px;
  }
  .hero::before{
    content:"";position:absolute;inset:0;
    background-image:linear-gradient(rgba(232,21,43,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(232,21,43,.05) 1px,transparent 1px);
    background-size:52px 52px;
    mask-image:radial-gradient(circle at center,#000 30%,transparent 78%);
    -webkit-mask-image:radial-gradient(circle at center,#000 30%,transparent 78%);
    pointer-events:none;
  }
  .hero .container{position:relative;z-index:2;}
  .hero-tag{
    display:inline-flex;align-items:center;gap:8px;
    background:#fff;border:1px solid var(--line);color:var(--red);
    padding:7px 18px;border-radius:999px;font-size:13px;font-weight:600;
    box-shadow:var(--shadow);margin-bottom:26px;
  }
  .hero-tag .dot{width:8px;height:8px;border-radius:50%;background:var(--red);animation:pulse 1.8s infinite;}
  @keyframes pulse{0%,100%{opacity:1;transform:scale(1);}50%{opacity:.4;transform:scale(1.4);}}
  .hero h1{
    font-size:clamp(30px,4.6vw,56px);line-height:1.18;font-weight:900;
    letter-spacing:-.5px;max-width:900px;margin-bottom:22px;
  }
  .hero h1 .hl{
    background:linear-gradient(120deg,var(--red),var(--orange));
    -webkit-background-clip:text;background-clip:text;color:transparent;
  }
  .hero-sub{font-size:clamp(15px,1.6vw,18px);color:var(--gray);max-width:720px;margin-bottom:34px;}
  .hero-actions{display:flex;flex-wrap:wrap;gap:16px;margin-bottom:56px;}
  .hero-actions .btn{padding:15px 36px;font-size:16px;}
  .hero-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
  .stat-card{
    background:#fff;border:1px solid var(--line);border-radius:var(--radius);
    padding:24px 20px;text-align:center;box-shadow:0 4px 18px rgba(232,21,43,.06);
    transition:transform .3s,box-shadow .3s;
  }
  .stat-card:hover{transform:translateY(-6px);box-shadow:0 16px 36px rgba(232,21,43,.16);}
  .stat-num{font-size:34px;font-weight:900;color:var(--red);line-height:1.1;}
  .stat-num small{font-size:16px;font-weight:700;}
  .stat-label{font-size:13px;color:var(--gray);margin-top:8px;}

  /* ===== Section base ===== */
  section{padding:84px 0;}
  .section-head{text-align:center;max-width:760px;margin:0 auto 52px;}
  .eyebrow{
    display:inline-block;font-size:13px;font-weight:700;letter-spacing:2px;
    color:var(--red);text-transform:uppercase;margin-bottom:14px;
    padding:5px 14px;background:var(--bg-soft);border-radius:999px;
  }
  .section-head h2{font-size:clamp(24px,3vw,36px);font-weight:900;margin-bottom:14px;letter-spacing:-.5px;}
  .section-head p{color:var(--gray);font-size:15px;}
  .bg-soft{background:var(--bg-soft);}

  /* reveal */
  .reveal{opacity:0;transform:translateY(30px);transition:opacity .7s ease,transform .7s ease;}
  .reveal.in{opacity:1;transform:none;}

  /* ===== About ===== */
  .about-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center;}
  .about-text h3{font-size:24px;font-weight:800;margin-bottom:18px;}
  .about-text p{color:var(--gray);margin-bottom:16px;font-size:15px;}
  .feature-list{list-style:none;display:grid;gap:12px;margin-top:24px;}
  .feature-list li{display:flex;gap:12px;align-items:flex-start;font-size:15px;}
  .feature-list .ico{
    flex:0 0 26px;height:26px;border-radius:50%;background:linear-gradient(135deg,var(--red),var(--orange));
    color:#fff;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;margin-top:3px;
  }
  .about-visual{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
  .about-visual .ai-page-image{border-radius:var(--radius);box-shadow:var(--shadow);width:100%;height:100%;object-fit:cover;}
  .about-visual figure{overflow:hidden;border-radius:var(--radius);}
  .about-visual figure:first-child{grid-column:1 / -1;}

  /* ===== Services cards ===== */
  .card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
  .service-card{
    background:#fff;border:1px solid var(--line);border-radius:var(--radius);
    padding:30px 26px;transition:transform .3s,box-shadow .3s,border-color .3s;
    position:relative;overflow:hidden;
  }
  .service-card::after{
    content:"";position:absolute;top:0;left:0;height:4px;width:0;background:linear-gradient(90deg,var(--red),var(--orange));transition:width .4s;
  }
  .service-card:hover{transform:translateY(-6px);box-shadow:0 18px 40px rgba(232,21,43,.14);border-color:#f5c9ce;}
  .service-card:hover::after{width:100%;}
  .service-icon{
    width:54px;height:54px;border-radius:14px;display:flex;align-items:center;justify-content:center;
    background:var(--bg-soft);color:var(--red);margin-bottom:18px;
  }
  .service-icon svg{width:28px;height:28px;}
  .service-card h3{font-size:18px;font-weight:800;margin-bottom:10px;}
  .service-card p{font-size:14px;color:var(--gray);}

  /* ===== One-stop / scenario pills ===== */
  .scenario-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;}
  .scenario-item{
    display:flex;align-items:center;gap:10px;background:#fff;border:1px solid var(--line);
    border-radius:12px;padding:14px 16px;font-size:14px;font-weight:600;
    transition:transform .25s,box-shadow .25s,border-color .25s;
  }
  .scenario-item:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#f5c9ce;}
  .scenario-item .bullet{flex:0 0 8px;height:8px;border-radius:50%;background:linear-gradient(135deg,var(--red),var(--orange));}

  /* ===== Steps ===== */
  .steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;position:relative;}
  .step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px 22px;text-align:center;transition:transform .3s,box-shadow .3s;}
  .step:hover{transform:translateY(-6px);box-shadow:var(--shadow);}
  .step-num{
    width:52px;height:52px;margin:0 auto 16px;border-radius:50%;
    background:linear-gradient(135deg,var(--red),var(--orange));color:#fff;
    display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:900;
    box-shadow:0 8px 20px rgba(232,21,43,.3);
  }
  .step h3{font-size:17px;font-weight:800;margin-bottom:8px;}
  .step p{font-size:13px;color:var(--gray);}

  /* ===== Compare / rating ===== */
  .rating-hero{
    background:linear-gradient(135deg,#1a0f11,#3a1219);
    border-radius:24px;padding:44px;color:#fff;margin-bottom:36px;
    display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:24px;
    position:relative;overflow:hidden;
  }
  .rating-hero::before{
    content:"";position:absolute;right:-60px;top:-60px;width:260px;height:260px;border-radius:50%;
    background:radial-gradient(circle,rgba(255,90,46,.5),transparent 70%);
  }
  .rating-hero h3{font-size:26px;font-weight:900;margin-bottom:8px;}
  .rating-hero p{color:#f3cfd3;font-size:14px;max-width:520px;}
  .rating-score{position:relative;text-align:center;}
  .rating-score .num{font-size:64px;font-weight:900;line-height:1;color:#ff6b4a;}
  .rating-score .num small{font-size:22px;color:#f3cfd3;}
  .rating-stars{font-size:22px;color:#ffb703;letter-spacing:3px;margin-top:6px;}
  .table-wrap{overflow-x:auto;border-radius:var(--radius);border:1px solid var(--line);background:#fff;}
  table.compare{width:100%;border-collapse:collapse;min-width:640px;font-size:14px;}
  table.compare th,table.compare td{padding:16px 20px;text-align:left;border-bottom:1px solid var(--line);}
  table.compare thead th{background:var(--red-deep);color:#fff;font-weight:700;font-size:14px;}
  table.compare tbody tr:hover{background:var(--bg-soft);}
  table.compare td:first-child{font-weight:700;color:var(--ink);}
  .tag-good{color:var(--red);font-weight:700;}
  .muted{color:var(--gray);}

  /* ===== Reviews ===== */
  .review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
  .review-card{
    background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;
    transition:transform .3s,box-shadow .3s;display:flex;flex-direction:column;
  }
  .review-card:hover{transform:translateY(-6px);box-shadow:var(--shadow);}
  .review-stars{color:#ffb703;font-size:15px;letter-spacing:2px;margin-bottom:12px;}
  .review-card blockquote{font-size:14px;color:#3d3437;flex:1;margin-bottom:18px;}
  .review-user{display:flex;align-items:center;gap:12px;border-top:1px solid var(--line);padding-top:16px;}
  .avatar{width:42px;height:42px;border-radius:50%;background:linear-gradient(135deg,var(--red),var(--orange));color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:16px;}
  .review-user .name{font-weight:700;font-size:14px;}
  .review-user .role{font-size:12px;color:var(--gray);}

  /* ===== Cases ===== */
  .case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
  .case-card{border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);background:#fff;transition:transform .3s,box-shadow .3s;}
  .case-card:hover{transform:translateY(-6px);box-shadow:0 18px 40px rgba(232,21,43,.14);}
  .case-card figure{overflow:hidden;aspect-ratio:16/10;background:#fdf1f2;}
  .case-card figure img{width:100%;height:100%;object-fit:cover;transition:transform .5s;}
  .case-card:hover figure img{transform:scale(1.06);}
  .case-body{padding:22px 24px;}
  .case-body h3{font-size:17px;font-weight:800;margin-bottom:8px;}
  .case-body p{font-size:13.5px;color:var(--gray);}

  /* ===== Network ===== */
  .network-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;}
  .network-card{
    background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;text-align:center;
    transition:transform .3s,box-shadow .3s;
  }
  .network-card:hover{transform:translateY(-5px);box-shadow:var(--shadow);}
  .network-card strong{display:block;font-size:17px;color:var(--red-deep);margin-bottom:6px;}
  .network-card span{font-size:13px;color:var(--gray);}

  /* ===== Timeline ===== */
  .timeline{position:relative;padding-left:32px;}
  .timeline::before{content:"";position:absolute;left:9px;top:6px;bottom:6px;width:2px;background:linear-gradient(180deg,var(--red),rgba(232,21,43,.15));}
  .tl-item{position:relative;padding-bottom:30px;}
  .tl-item::before{content:"";position:absolute;left:-32px;top:6px;width:16px;height:16px;border-radius:50%;background:#fff;border:4px solid var(--red);}
  .tl-item h4{font-size:16px;font-weight:800;margin-bottom:6px;}
  .tl-item p{font-size:14px;color:var(--gray);}

  /* ===== Tag cloud / price ===== */
  .tag-cloud{display:flex;flex-wrap:wrap;gap:10px;}
  .tag-cloud span{
    background:#fff;border:1px solid var(--line);border-radius:999px;padding:8px 16px;font-size:13px;color:#4a4144;
    transition:.25s;cursor:default;
  }
  .tag-cloud span:hover{background:var(--red);color:#fff;border-color:var(--red);transform:translateY(-3px);}
  .price-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:36px;}
  .price-card{
    background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:32px 28px;
    transition:transform .3s,box-shadow .3s;
  }
  .price-card:hover{transform:translateY(-6px);box-shadow:var(--shadow);}
  .price-card.featured{border-color:var(--red);box-shadow:0 12px 34px rgba(232,21,43,.16);position:relative;}
  .price-card.featured::before{content:"推荐";position:absolute;top:18px;right:18px;background:var(--red);color:#fff;font-size:12px;padding:3px 12px;border-radius:999px;font-weight:700;}
  .price-card h3{font-size:18px;font-weight:800;margin-bottom:10px;}
  .price-card .amount{font-size:34px;font-weight:900;color:var(--red);margin-bottom:8px;}
  .price-card .amount small{font-size:14px;color:var(--gray);font-weight:600;}
  .price-card p{font-size:13.5px;color:var(--gray);margin-bottom:18px;}
  .price-list{list-style:none;display:grid;gap:10px;font-size:13.5px;color:#3d3437;}
  .price-list li::before{content:"✓";color:var(--red);font-weight:900;margin-right:8px;}

  /* ===== Articles ===== */
  .article-list{display:grid;gap:14px;max-width:820px;margin:0 auto;}
  .article-item{
    display:flex;align-items:center;gap:18px;background:#fff;border:1px solid var(--line);
    border-radius:12px;padding:18px 22px;transition:transform .25s,box-shadow .25s,border-color .25s;
  }
  .article-item:hover{transform:translateX(6px);box-shadow:var(--shadow);border-color:#f5c9ce;}
  .article-item .idx{font-size:15px;font-weight:900;color:var(--red);flex:0 0 34px;}
  .article-item a{font-size:15px;font-weight:600;color:var(--ink);}
  .article-item a:hover{color:var(--red);}

  /* ===== Form ===== */
  .form-wrap{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start;}
  .form-info h3{font-size:24px;font-weight:900;margin-bottom:16px;}
  .form-info p{color:var(--gray);font-size:15px;margin-bottom:24px;}
  .contact-lines{list-style:none;display:grid;gap:14px;font-size:14.5px;}
  .contact-lines li{display:flex;gap:12px;align-items:flex-start;}
  .contact-lines .lbl{color:var(--gray);flex:0 0 84px;}
  .contact-lines .val{font-weight:600;word-break:break-all;}
  .kefu-qr{margin-top:26px;display:inline-block;text-align:center;}
  .kefu-qr img{width:150px;height:150px;border-radius:12px;border:1px solid var(--line);object-fit:cover;}
  .kefu-qr span{display:block;font-size:13px;color:var(--gray);margin-top:8px;}
  form.demand-form{background:#fff;border:1px solid var(--line);border-radius:20px;padding:34px;box-shadow:var(--shadow);}
  .field{margin-bottom:18px;}
  .field label{display:block;font-size:13.5px;font-weight:700;margin-bottom:7px;}
  .field label .req{color:var(--red);}
  .field input,.field select,.field textarea{
    width:100%;padding:12px 14px;border-radius:10px;border:1px solid #e8d8da;font-size:14px;
    font-family:inherit;background:#fffdfd;transition:.2s;
  }
  .field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--red);box-shadow:0 0 0 3px rgba(232,21,43,.12);}
  .field textarea{resize:vertical;min-height:110px;}
  .form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;}

  /* ===== FAQ ===== */
  .faq-list{max-width:880px;margin:0 auto;display:grid;gap:14px;}
  .faq-item{background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden;transition:box-shadow .25s,border-color .25s;}
  .faq-item.open{box-shadow:var(--shadow);border-color:#f5c9ce;}
  .faq-q{
    width:100%;background:none;border:none;text-align:left;cursor:pointer;
    padding:20px 24px;font-size:15.5px;font-weight:700;display:flex;align-items:center;justify-content:space-between;gap:16px;
    font-family:inherit;color:var(--ink);
  }
  .faq-q .plus{flex:0 0 26px;height:26px;border-radius:50%;background:var(--bg-soft);color:var(--red);display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:700;transition:transform .3s,background .3s;}
  .faq-item.open .plus{transform:rotate(45deg);background:var(--red);color:#fff;}
  .faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease;}
  .faq-a p{padding:0 24px 22px;font-size:14px;color:var(--gray);}

  /* ===== Footer ===== */
  footer{background:linear-gradient(160deg,#1a0f11,#341118);color:#e9d6d9;padding:64px 0 0;}
  .footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:40px;padding-bottom:44px;}
  footer h4{font-size:15px;font-weight:800;color:#fff;margin-bottom:18px;}
  footer p{font-size:13.5px;color:#c9aeb2;margin-bottom:10px;line-height:1.8;}
  footer a{font-size:13.5px;color:#c9aeb2;transition:.2s;}
  footer a:hover{color:#ff6b4a;}
  .footer-links{list-style:none;display:grid;gap:10px;}
  .footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:22px 0;font-size:13px;color:#a98b8f;text-align:center;}

  /* ===== Floating ===== */
  .float-cs{
    position:fixed;right:22px;bottom:28px;z-index:200;display:flex;flex-direction:column;gap:12px;align-items:flex-end;
  }
  .float-btn{
    width:54px;height:54px;border-radius:50%;background:linear-gradient(135deg,var(--red),var(--orange));
    color:#fff;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;
    box-shadow:0 10px 26px rgba(232,21,43,.4);transition:transform .25s;font-size:12px;font-weight:700;
  }
  .float-btn:hover{transform:scale(1.1);}
  .float-btn svg{width:24px;height:24px;}
  .cs-pop{
    position:fixed;right:22px;bottom:96px;z-index:199;background:#fff;border-radius:16px;padding:20px;
    box-shadow:0 16px 44px rgba(0,0,0,.18);width:220px;text-align:center;
    opacity:0;visibility:hidden;transform:translateY(12px);transition:.28s;border:1px solid var(--line);
  }
  .cs-pop.show{opacity:1;visibility:visible;transform:none;}
  .cs-pop img{width:150px;height:150px;margin:0 auto 10px;border-radius:10px;object-fit:cover;}
  .cs-pop p{font-size:13px;color:var(--gray);}
  #backTop{display:none;}
  #backTop.show{display:flex;}

  /* ===== Responsive ===== */
  @media (max-width:1024px){
    .card-grid,.review-grid,.case-grid,.price-grid{grid-template-columns:repeat(2,1fr);}
    .scenario-grid{grid-template-columns:repeat(3,1fr);}
    .steps{grid-template-columns:repeat(2,1fr);}
    .network-grid{grid-template-columns:repeat(2,1fr);}
    .about-grid,.form-wrap{grid-template-columns:1fr;}
    .footer-grid{grid-template-columns:1fr 1fr;}
  }
  @media (max-width:820px){
    .menu-toggle{display:block;}
    nav.nav{
      position:absolute;top:72px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);
      max-height:0;overflow:hidden;transition:max-height .35s ease;margin-left:0;
      box-shadow:0 12px 24px rgba(0,0,0,.06);
    }
    nav.nav.open{max-height:640px;overflow-y:auto;}
    .nav-links{flex-direction:column;align-items:stretch;padding:10px 16px;}
    .nav-links a{padding:12px 8px;border-radius:8px;}
    .header-cta .btn{display:none;}
    .hero-stats{grid-template-columns:repeat(2,1fr);}
  }
  @media (max-width:640px){
    section{padding:60px 0;}
    .card-grid,.review-grid,.case-grid,.price-grid,.scenario-grid,.network-grid{grid-template-columns:1fr;}
    .form-row{grid-template-columns:1fr;}
    .hero{padding:56px 0 64px;}
    .hero-actions .btn{width:100%;}
    .rating-hero{padding:30px;}
    .rating-score .num{font-size:48px;}
    .footer-grid{grid-template-columns:1fr;gap:30px;}
    form.demand-form{padding:24px;}
    .stat-num{font-size:28px;}
  }