:root{
      --bg:#f5fbf7;
      --bg2:#eef8f0;
      --card:#ffffff;
      --card2:#f6fff8;
      --line:#d9eadf;
      --text:#173126;
      --muted:#587063;
      --brand:#18c46f;
      --brand2:#0ea85b;
      --accent:#1c7c54;
      --warn:#f4b844;
      --shadow:0 18px 40px rgba(18, 74, 44, .08);
      --shadow2:0 10px 24px rgba(18, 74, 44, .10);
      --radius:18px;
      --radius2:24px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
      color:var(--text);
      background:
        radial-gradient(circle at top left, rgba(24,196,111,.12), transparent 26%),
        radial-gradient(circle at top right, rgba(14,168,91,.10), transparent 22%),
        linear-gradient(180deg, var(--bg) 0%, #ffffff 45%, var(--bg2) 100%);
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(var(--container), calc(100% - 32px)); margin:0 auto}
    .section{padding:72px 0}
    .eyebrow{
      display:inline-flex; align-items:center; gap:8px;
      padding:8px 14px; border:1px solid rgba(24,196,111,.18);
      background:rgba(255,255,255,.72); color:var(--accent);
      border-radius:999px; font-size:14px; font-weight:700;
      box-shadow:0 8px 20px rgba(24,196,111,.06)
    }
    .eyebrow::before{content:""; width:8px; height:8px; border-radius:50%; background:var(--brand); box-shadow:0 0 0 6px rgba(24,196,111,.12)}
    h1,h2,h3,p{margin:0}
    h1{font-size:clamp(36px, 6vw, 58px); line-height:1.06; letter-spacing:-.03em}
    h2{font-size:clamp(26px, 3vw, 38px); line-height:1.15}
    h3{font-size:20px; line-height:1.2}
    p{line-height:1.75; color:var(--muted)}
    .topbar{
      position:sticky; top:0; z-index:60; backdrop-filter:saturate(180%) blur(16px);
      background:rgba(245,251,247,.78); border-bottom:1px solid rgba(217,234,223,.8)
    }
    .nav{
      display:flex; align-items:center; justify-content:space-between; gap:18px; padding:14px 0
    }
    .brand{display:flex; align-items:center; gap:12px; min-width:0}
    .brand .ai-page-logo{width:42px; height:42px; object-fit:contain; border-radius:12px; background:#fff; box-shadow:var(--shadow2)}
    .brand strong{display:block; font-size:18px; color:var(--text)}
    .brand span{display:block; font-size:12px; color:var(--muted)}
    .nav-toggle{display:none; border:1px solid var(--line); background:#fff; color:var(--text); border-radius:12px; padding:10px 12px}
    .nav-links{display:flex; flex-wrap:wrap; justify-content:flex-end; gap:8px 14px; align-items:center}
    .nav-links a{font-size:14px; color:var(--text); padding:8px 10px; border-radius:10px}
    .nav-links a:hover{background:rgba(24,196,111,.10); color:var(--accent)}
    .btn{
      display:inline-flex; align-items:center; justify-content:center; gap:8px;
      padding:12px 18px; border-radius:14px; border:1px solid transparent;
      font-weight:700; transition:.24s ease; cursor:pointer
    }
    .btn-primary{background:linear-gradient(135deg, var(--brand), var(--brand2)); color:#fff; box-shadow:0 12px 24px rgba(24,196,111,.26)}
    .btn-primary:hover{transform:translateY(-2px); box-shadow:0 16px 28px rgba(24,196,111,.30)}
    .btn-ghost{background:#fff; border-color:var(--line); color:var(--text)}
    .btn-ghost:hover{border-color:rgba(24,196,111,.34); color:var(--accent)}
    .hero{padding:28px 0 56px}
    .hero-shell{
      position:relative; overflow:hidden; border:1px solid rgba(217,234,223,.9);
      background:
        radial-gradient(circle at 20% 25%, rgba(24,196,111,.18), transparent 28%),
        radial-gradient(circle at 80% 20%, rgba(244,184,68,.12), transparent 22%),
        linear-gradient(180deg, rgba(255,255,255,.94), rgba(247,255,250,.96));
      border-radius:28px; box-shadow:var(--shadow); padding:34px
    }
    .hero-shell::after{
      content:""; position:absolute; inset:auto -40px -50px auto; width:240px; height:240px; border-radius:50%;
      background:radial-gradient(circle, rgba(24,196,111,.16), transparent 68%); pointer-events:none
    }
    .hero-grid{display:grid; grid-template-columns:1.2fr .8fr; gap:28px; align-items:center}
    .hero-copy{position:relative; z-index:1}
    .hero-copy p{max-width:62ch; margin-top:16px}
    .hero-actions{display:flex; flex-wrap:wrap; gap:12px; margin-top:24px}
    .hero-points{display:grid; grid-template-columns:repeat(3, minmax(0,1fr)); gap:12px; margin-top:26px}
    .mini{
      background:rgba(255,255,255,.76); border:1px solid var(--line); border-radius:18px; padding:16px;
      box-shadow:0 10px 20px rgba(20,60,40,.05)
    }
    .mini strong{display:block; font-size:18px; margin-bottom:4px}
    .hero-panel{display:grid; gap:14px}
    .hero-card{
      background:linear-gradient(180deg, #ffffff, #f7fff9); border:1px solid rgba(217,234,223,.95);
      border-radius:22px; padding:18px; box-shadow:var(--shadow2)
    }
    .hero-card .chips{display:flex; flex-wrap:wrap; gap:8px; margin-top:12px}
    .chip{padding:7px 10px; border-radius:999px; background:#edf9f1; color:var(--accent); font-size:13px; border:1px solid rgba(24,196,111,.12)}
    .grid-4{display:grid; grid-template-columns:repeat(4, minmax(0,1fr)); gap:16px}
    .card{
      background:var(--card); border:1px solid var(--line); border-radius:var(--radius);
      box-shadow:0 10px 24px rgba(18,74,44,.05); padding:20px; transition:transform .2s ease, box-shadow .2s ease, border-color .2s ease
    }
    .card:hover{transform:translateY(-3px); box-shadow:var(--shadow2); border-color:rgba(24,196,111,.28)}
    .metric strong{display:block; font-size:30px; color:var(--text); margin-bottom:8px}
    .metric span{color:var(--muted); font-size:14px}
    .section-head{display:flex; justify-content:space-between; align-items:end; gap:16px; margin-bottom:24px}
    .section-head p{max-width:68ch}
    .service-grid,.case-grid,.review-grid,.article-grid,.faq-grid,.network-grid,.feature-grid{display:grid; gap:16px}
    .service-grid{grid-template-columns:repeat(3, minmax(0,1fr))}
    .feature-grid{grid-template-columns:repeat(4, minmax(0,1fr))}
    .case-grid{grid-template-columns:repeat(3, minmax(0,1fr))}
    .review-grid{grid-template-columns:repeat(3, minmax(0,1fr))}
    .article-grid{grid-template-columns:repeat(3, minmax(0,1fr))}
    .network-grid{grid-template-columns:repeat(4, minmax(0,1fr))}
    .icon{
      width:44px; height:44px; border-radius:14px; display:grid; place-items:center;
      background:linear-gradient(135deg, rgba(24,196,111,.14), rgba(24,196,111,.06)); color:var(--accent); margin-bottom:14px
    }
    .tag-cloud{display:flex; flex-wrap:wrap; gap:10px}
    .tag-cloud .tag{padding:9px 12px; background:#fff; border:1px solid var(--line); border-radius:999px; color:var(--text); font-size:13px}
    .steps{display:grid; grid-template-columns:repeat(4, minmax(0,1fr)); gap:16px}
    .step{
      position:relative; padding:20px; background:#fff; border:1px solid var(--line); border-radius:20px
    }
    .step b{
      display:inline-flex; width:34px; height:34px; align-items:center; justify-content:center;
      background:var(--brand); color:#fff; border-radius:50%; margin-bottom:12px
    }
    .compare{overflow:auto; border:1px solid var(--line); border-radius:20px; background:#fff; box-shadow:var(--shadow)}
    table{width:100%; border-collapse:collapse; min-width:860px}
    th,td{padding:16px 14px; text-align:left; border-bottom:1px solid #edf2ee; vertical-align:top}
    th{background:#f5fbf7; color:var(--text)}
    .good{color:#16784a; font-weight:700}
    .bad{color:#a06314}
    .price-grid{display:grid; grid-template-columns:repeat(3, minmax(0,1fr)); gap:16px}
    .price{
      padding:22px; border-radius:22px; border:1px solid var(--line); background:linear-gradient(180deg, #fff, #f7fff9)
    }
    .price strong{display:block; font-size:30px; margin:10px 0; color:var(--text)}
    .faq-item{background:#fff; border:1px solid var(--line); border-radius:18px; overflow:hidden}
    .faq-q{
      width:100%; border:0; background:transparent; padding:18px 18px; text-align:left; font-size:16px; font-weight:700; color:var(--text);
      display:flex; justify-content:space-between; gap:16px; align-items:center; cursor:pointer
    }
    .faq-q span{color:var(--muted); font-weight:600}
    .faq-a{max-height:0; overflow:hidden; transition:max-height .28s ease, padding .28s ease}
    .faq-a p{padding:0 18px 18px}
    .faq-item.open .faq-a{max-height:180px}
    .faq-item.open .faq-a p{padding-top:0}
    .comment{display:flex; flex-direction:column; gap:12px}
    .quote{font-size:15px; color:var(--text)}
    .person{display:flex; justify-content:space-between; gap:12px; align-items:center}
    .person strong{display:block}
    .person span{font-size:13px; color:var(--muted)}
    .articles a{
      display:block; padding:16px 0; border-bottom:1px dashed #dbe7de
    }
    .articles a:last-child{border-bottom:0}
    .form-grid{display:grid; grid-template-columns:1.1fr .9fr; gap:16px; align-items:start}
    form{
      background:#fff; border:1px solid var(--line); border-radius:24px; padding:22px; box-shadow:var(--shadow)
    }
    .fields{display:grid; grid-template-columns:repeat(2, minmax(0,1fr)); gap:14px}
    .field{display:flex; flex-direction:column; gap:8px}
    label{font-size:14px; color:var(--text); font-weight:700}
    input,select,textarea{
      width:100%; border:1px solid #d9e6dd; background:#fbfdfb; color:var(--text);
      border-radius:14px; padding:12px 14px; font:inherit; outline:none
    }
    textarea{min-height:132px; resize:vertical}
    input:focus,select:focus,textarea:focus{border-color:rgba(24,196,111,.55); box-shadow:0 0 0 4px rgba(24,196,111,.12)}
    .form-side{
      display:grid; gap:16px
    }
    .contact-box,.float-box{
      background:linear-gradient(180deg, #fff, #f7fff9); border:1px solid var(--line); border-radius:22px; padding:20px
    }
    .contact-row{display:grid; gap:10px}
    .footer{
      padding:28px 0 36px; border-top:1px solid rgba(217,234,223,.9); background:rgba(255,255,255,.76)
    }
    .footer-grid{display:grid; grid-template-columns:1.2fr .8fr; gap:20px; align-items:start}
    .footer a{color:var(--accent)}
    .floating{
      position:fixed; right:16px; bottom:16px; z-index:70; display:grid; gap:10px
    }
    .float-btn{
      width:52px; height:52px; border-radius:16px; display:grid; place-items:center;
      background:linear-gradient(135deg, var(--brand), var(--brand2)); color:#fff; box-shadow:0 16px 28px rgba(24,196,111,.26)
    }
    .float-panel{
      width:min(320px, calc(100vw - 32px)); display:none
    }
    .floating.open .float-panel{display:block}
    .floating.open .float-btn{transform:rotate(15deg)}
    .backtop{
      position:fixed; right:16px; bottom:82px; z-index:69; opacity:0; pointer-events:none; transition:.2s ease
    }
    .backtop.show{opacity:1; pointer-events:auto}
    .reveal{opacity:0; transform:translateY(14px); transition:.55s ease}
    .reveal.visible{opacity:1; transform:none}
    .toolbar{display:flex; flex-wrap:wrap; gap:10px; margin-top:18px}
    .logo-box{
      display:flex; align-items:center; gap:14px; padding:14px; background:#fff; border:1px solid var(--line); border-radius:20px
    }
    .logo-box .ai-page-logo{width:58px; height:58px; object-fit:contain}
    @media (max-width: 1024px){
      .hero-grid,.form-grid,.footer-grid{grid-template-columns:1fr}
      .grid-4,.service-grid,.feature-grid,.case-grid,.review-grid,.article-grid,.network-grid,.steps,.price-grid{grid-template-columns:repeat(2, minmax(0,1fr))}
      .hero-points{grid-template-columns:1fr}
    }
    @media (max-width: 760px){
      .container{width:min(var(--container), calc(100% - 24px))}
      .section{padding:56px 0}
      .nav-toggle{display:inline-flex}
      .nav{position:relative}
      .nav-links{
        display:none; position:absolute; top:62px; left:0; right:0; padding:14px; background:#fff; border:1px solid var(--line);
        border-radius:18px; box-shadow:var(--shadow); justify-content:flex-start
      }
      .nav.open .nav-links{display:flex}
      .hero-shell{padding:22px}
      .hero-actions{flex-direction:column; align-items:stretch}
      .grid-4,.service-grid,.feature-grid,.case-grid,.review-grid,.article-grid,.network-grid,.steps,.price-grid,.fields{grid-template-columns:1fr}
      .section-head{flex-direction:column; align-items:start}
      h1{font-size:34px}
      .compare{border-radius:16px}
      table{min-width:760px}
    }