:root{
      --bg:#f4fbf8;
      --bg-2:#edf7f2;
      --card:#ffffff;
      --line:#d8ebe3;
      --text:#20312b;
      --muted:#5e716b;
      --brand:#16a085;
      --brand-2:#4cc3a1;
      --accent:#eafaf3;
      --shadow:0 12px 30px rgba(31, 67, 54, .08);
      --shadow-2:0 18px 40px rgba(31, 67, 54, .12);
      --radius:20px;
      --radius-sm:14px;
      --max:1200px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;
      color:var(--text);
      background:
        radial-gradient(circle at top left, rgba(76,195,161,.16), transparent 26%),
        radial-gradient(circle at top right, rgba(22,160,133,.10), transparent 22%),
        linear-gradient(180deg, #f8fffc 0%, var(--bg) 30%, #f7fbf9 100%);
      line-height:1.7;
    }
    a{color:var(--brand);text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(var(--max), calc(100% - 32px)); margin:0 auto}
    .site-header{
      position:sticky; top:0; z-index:50;
      backdrop-filter: blur(14px);
      background:rgba(244,251,248,.82);
      border-bottom:1px solid rgba(216,235,227,.85);
    }
    .nav{
      display:flex; align-items:center; justify-content:space-between; gap:16px;
      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;padding:4px;border:1px solid var(--line);box-shadow:0 8px 20px rgba(0,0,0,.05)}
    .brand-text{min-width:0}
    .brand-text strong{display:block;font-size:16px;letter-spacing:.5px}
    .brand-text 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;font-size:14px
    }
    .nav-links{display:flex;align-items:center;gap:18px;flex-wrap:wrap;justify-content:flex-end}
    .nav-links a{color:var(--text);font-size:14px;padding:8px 0;opacity:.88}
    .nav-links a:hover{color:var(--brand)}
    .hero{
      padding:34px 0 18px;
    }
    .hero-grid{
      display:grid; grid-template-columns:1.18fr .82fr; gap:22px; align-items:stretch;
    }
    .hero-main,.hero-side,.section-card,.panel,.faq-item,.review-card,.article-card,.compare-wrap,.form-card,.stat-card,.network-card,.timeline-card{
      background:var(--card); border:1px solid var(--line); border-radius:var(--radius); box-shadow:var(--shadow);
    }
    .hero-main{
      padding:30px;
      position:relative;
      overflow:hidden;
      background:
        linear-gradient(135deg, rgba(22,160,133,.10), rgba(76,195,161,.05) 38%, #fff 100%);
    }
    .hero-main::after{
      content:""; position:absolute; inset:auto -70px -80px auto; width:220px; height:220px; border-radius:50%;
      background:radial-gradient(circle, rgba(76,195,161,.20), rgba(76,195,161,0) 70%);
      pointer-events:none;
    }
    .eyebrow{display:inline-flex; align-items:center; gap:8px; font-size:13px; color:var(--brand); background:var(--accent); padding:8px 12px; border-radius:999px; border:1px solid rgba(22,160,133,.14)}
    h1{margin:18px 0 12px; font-size:clamp(30px,4vw,48px); line-height:1.12}
    .lead{margin:0; color:var(--muted); font-size:16px; max-width:58ch}
    .hero-actions{display:flex; gap:12px; flex-wrap:wrap; margin:22px 0 18px}
    .btn{
      display:inline-flex; align-items:center; justify-content:center; gap:8px;
      min-height:46px; padding:0 18px; border-radius:14px; border:1px solid transparent;
      font-weight:700; transition:.2s ease; cursor:pointer;
    }
    .btn-primary{background:linear-gradient(135deg, var(--brand), var(--brand-2)); color:#fff; box-shadow:0 10px 22px rgba(22,160,133,.24)}
    .btn-secondary{background:#fff; color:var(--text); border-color:var(--line)}
    .btn:hover{transform:translateY(-1px); box-shadow:var(--shadow-2)}
    .hero-badges{display:flex; flex-wrap:wrap; gap:10px; margin-top:10px}
    .chip{padding:8px 12px; border-radius:999px; background:#fff; border:1px solid var(--line); color:var(--muted); font-size:13px}
    .hero-side{padding:20px; display:flex; flex-direction:column; gap:14px}
    .hero-mini{
      padding:18px; background:linear-gradient(180deg, #fff, #f7fffc); border:1px solid var(--line); border-radius:18px
    }
    .hero-mini h3{margin:0 0 10px; font-size:18px}
    .hero-mini ul{margin:0; padding-left:18px; color:var(--muted)}
    .hero-mini li{margin:7px 0}
    .metric-grid,.service-grid,.case-grid,.review-grid,.article-grid,.network-grid,.price-grid,.help-grid,.tag-cloud,.steps-grid,.compare-grid,.flow-grid{
      display:grid; gap:16px;
    }
    .metric-grid{grid-template-columns:repeat(4,minmax(0,1fr)); margin:22px 0 0}
    .stat-card{padding:18px}
    .stat-card strong{display:block;font-size:28px;line-height:1.1}
    .stat-card span{color:var(--muted);font-size:13px}
    section{padding:18px 0}
    .section-head{display:flex; align-items:flex-end; justify-content:space-between; gap:16px; margin-bottom:16px}
    .section-head h2{margin:0; font-size:28px}
    .section-head p{margin:0; color:var(--muted); max-width:68ch}
    .section-card{padding:24px}
    .service-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
    .feature{
      padding:18px; border-radius:18px; border:1px solid var(--line); background:linear-gradient(180deg, #fff, #f9fffd);
      transition:transform .2s ease, box-shadow .2s ease;
    }
    .feature:hover{transform:translateY(-3px); box-shadow:var(--shadow-2)}
    .feature h3{margin:0 0 8px; font-size:18px}
    .feature p{margin:0; color:var(--muted)}
    .split{
      display:grid; grid-template-columns:1fr 1fr; gap:16px;
    }
    .panel{padding:22px}
    .panel h3{margin-top:0}
    .steps-grid{grid-template-columns:repeat(4,minmax(0,1fr))}
    .step{
      padding:18px; border-radius:18px; background:#fff; border:1px solid var(--line); position:relative
    }
    .step .num{display:inline-flex; width:34px; height:34px; align-items:center; justify-content:center; border-radius:10px; background:var(--accent); color:var(--brand); font-weight:800; margin-bottom:12px}
    .step h3{margin:0 0 8px}
    .step p{margin:0; color:var(--muted)}
    .compare-wrap{padding:0; overflow:hidden}
    table{width:100%; border-collapse:collapse}
    th,td{padding:14px 16px; border-bottom:1px solid var(--line); text-align:left; vertical-align:top}
    th{background:#f3fbf7; color:var(--text)}
    tbody tr:hover{background:#fafefa}
    .rating{
      display:flex; align-items:center; gap:10px; flex-wrap:wrap
    }
    .stars{color:#f4a63f; letter-spacing:2px; font-size:18px}
    .compare-note{padding:18px 22px; background:linear-gradient(135deg, rgba(76,195,161,.10), rgba(255,255,255,.9)); border-top:1px solid var(--line)}
    .tag-cloud{grid-template-columns:repeat(6,minmax(0,1fr))}
    .tag{
      padding:12px 14px; border:1px solid var(--line); border-radius:14px; background:#fff; text-align:center; color:var(--text)
    }
    .price-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
    .price-card{padding:20px; border:1px solid var(--line); border-radius:18px; background:#fff}
    .price-card strong{font-size:24px}
    .timeline-card{padding:22px}
    .timeline{display:grid; gap:14px}
    .time-item{display:grid; grid-template-columns:92px 1fr; gap:14px; padding:14px; border-radius:14px; background:#fff; border:1px solid var(--line)}
    .time-item b{color:var(--brand)}
    .case-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
    .case-card,.review-card,.article-card{padding:18px}
    .case-card h3,.review-card h3,.article-card h3{margin:0 0 8px}
    .meta{color:var(--muted); font-size:13px}
    .review-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
    .faq-grid{display:grid; gap:12px}
    .faq-item{overflow:hidden}
    .faq-q{
      width:100%; background:none; border:none; padding:18px 20px; display:flex; justify-content:space-between; align-items:center; text-align:left; cursor:pointer; color:var(--text); font-size:16px; font-weight:700
    }
    .faq-a{max-height:0; overflow:hidden; transition:max-height .25s ease; padding:0 20px}
    .faq-item.active .faq-a{max-height:180px; padding-bottom:18px}
    .faq-a p{margin:0; color:var(--muted)}
    .form-card{padding:22px}
    form{display:grid; gap:14px}
    .form-row{display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:14px}
    input,select,textarea{
      width:100%; border:1px solid var(--line); background:#fff; color:var(--text); border-radius:14px; padding:13px 14px; font:inherit; outline:none;
    }
    textarea{min-height:120px; resize:vertical}
    input:focus,select:focus,textarea:focus{border-color:rgba(22,160,133,.5); box-shadow:0 0 0 4px rgba(22,160,133,.08)}
    .submit{justify-self:start}
    .help-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
    .help-item{padding:18px; border:1px solid var(--line); border-radius:18px; background:#fff}
    .help-item h3{margin:0 0 8px}
    .network-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
    .network-card,.section-card{padding:22px}
    .footer{
      padding:24px 0 30px;
      color:#20312b;
      background:linear-gradient(180deg, rgba(255,255,255,.35), rgba(236,248,243,.95));
      border-top:1px solid var(--line);
      margin-top:10px;
    }
    .footer a{color:var(--brand)}
    .footer-top{display:grid; grid-template-columns:1.1fr .9fr; gap:18px; align-items:start}
    .footer-links{display:flex; flex-wrap:wrap; gap:10px}
    .footer-links a{padding:8px 12px; border:1px solid var(--line); border-radius:999px; background:#fff}
    .footnote{margin-top:16px; color:var(--muted); font-size:13px}
    .fixed-tools{
      position:fixed; right:16px; bottom:16px; z-index:60; display:grid; gap:10px
    }
    .tool{
      width:48px; height:48px; border-radius:16px; display:flex; align-items:center; justify-content:center;
      background:linear-gradient(135deg,var(--brand),var(--brand-2)); color:#fff; box-shadow:0 12px 26px rgba(22,160,133,.24)
    }
    .float-kefu{
      position:fixed; left:16px; bottom:16px; z-index:60;
      width:56px; height:56px; border-radius:18px; display:flex; align-items:center; justify-content:center;
      background:#fff; border:1px solid var(--line); box-shadow:var(--shadow)
    }
    .scroll-reveal{opacity:0; transform:translateY(14px); transition:.45s ease}
    .scroll-reveal.visible{opacity:1; transform:none}
    .mobile-only{display:none}
    .article-list{display:grid; gap:12px}
    .article-list a{
      display:flex; justify-content:space-between; gap:10px; padding:13px 14px; border:1px solid var(--line); border-radius:14px; background:#fff; color:var(--text)
    }
    .article-list a span{color:var(--muted)}
    @media (max-width: 1024px){
      .hero-grid,.footer-top,.split,.service-grid,.case-grid,.review-grid,.article-grid,.network-grid,.help-grid{grid-template-columns:1fr}
      .metric-grid,.steps-grid,.price-grid,.tag-cloud{grid-template-columns:repeat(2,minmax(0,1fr))}
      .form-row{grid-template-columns:1fr}
      .nav-toggle{display:inline-flex}
      .nav-links{
        display:none; position:absolute; left:16px; right:16px; top:68px;
        background:#fff; border:1px solid var(--line); border-radius:18px; padding:14px; box-shadow:var(--shadow)
      }
      .nav-links.open{display:flex; flex-direction:column; align-items:flex-start}
      .nav{position:relative}
    }
    @media (max-width: 640px){
      .container{width:min(var(--max), calc(100% - 20px))}
      .hero-main,.hero-side,.section-card,.panel,.faq-q,.faq-a,.review-card,.article-card,.compare-note,.network-card,.form-card,.timeline-card{padding-left:16px;padding-right:16px}
      .hero-main{padding-top:22px;padding-bottom:22px}
      h1{font-size:28px}
      .section-head{align-items:flex-start; flex-direction:column}
      .metric-grid,.steps-grid,.price-grid,.tag-cloud{grid-template-columns:1fr}
      .time-item{grid-template-columns:1fr}
      .mobile-only{display:inline-flex}
    }