:root{
      --bg:#f6f8fc;
      --panel:#ffffff;
      --panel-2:#eef4ff;
      --line:#dbe5f3;
      --text:#182233;
      --muted:#5e6b80;
      --brand:#2563eb;
      --brand-2:#15b8a6;
      --accent:#ff7a45;
      --shadow:0 18px 50px rgba(19, 41, 84, .08);
      --radius:22px;
      --container:1180px;
    }
    *{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(37,99,235,.10), transparent 22%),
        radial-gradient(circle at 85% 15%, rgba(21,184,166,.10), transparent 18%),
        linear-gradient(180deg, #fbfdff 0%, var(--bg) 100%);
      line-height:1.7;
    }
    a{color:var(--brand);text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(var(--container), calc(100% - 32px)); margin:0 auto}
    .site-header{
      position:sticky; top:0; z-index:30;
      backdrop-filter:saturate(140%) blur(14px);
      background:rgba(246,248,252,.82);
      border-bottom:1px solid rgba(219,229,243,.8);
    }
    .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; flex:none}
    .brand-text{display:flex; flex-direction:column; min-width:0}
    .brand-text strong{font-size:1.02rem; letter-spacing:.3px}
    .brand-text span{font-size:.82rem; color:var(--muted); white-space:nowrap; overflow:hidden; text-overflow:ellipsis}
    .nav-links{
      display:flex; align-items:center; gap:18px; flex-wrap:wrap; justify-content:flex-end;
      font-size:.95rem;
    }
    .nav-links a{color:var(--text); opacity:.88}
    .nav-links a:hover{color:var(--brand)}
    .nav-actions{display:flex; align-items:center; gap:10px}
    .btn{
      display:inline-flex; align-items:center; justify-content:center; gap:8px;
      padding:12px 18px; border-radius:999px; border:1px solid transparent;
      font-weight:700; transition:.25s ease; cursor:pointer; white-space:nowrap;
    }
    .btn-primary{background:linear-gradient(135deg, var(--brand), #1d4ed8); color:#fff; box-shadow:0 14px 28px rgba(37,99,235,.24)}
    .btn-primary:hover{transform:translateY(-2px); box-shadow:0 18px 34px rgba(37,99,235,.28)}
    .btn-ghost{background:#fff; color:var(--text); border-color:var(--line)}
    .btn-ghost:hover{transform:translateY(-2px); border-color:#b9c9e6; box-shadow:var(--shadow)}
    .menu-toggle{
      display:none; border:1px solid var(--line); background:#fff; border-radius:12px;
      width:44px; height:44px; align-items:center; justify-content:center; cursor:pointer;
    }
    .hero{
      padding:34px 0 18px;
    }
    .hero-grid{
      display:grid; grid-template-columns:1.18fr .82fr; gap:22px; align-items:stretch;
    }
    .hero-main,.hero-side,.panel,.card,.faq-item,.review,.article,.table-wrap,.form-wrap{
      background:rgba(255,255,255,.9);
      border:1px solid rgba(219,229,243,.9);
      box-shadow:var(--shadow);
      border-radius:var(--radius);
    }
    .hero-main{padding:34px}
    .eyebrow{
      display:inline-flex; align-items:center; gap:8px; padding:7px 12px; border-radius:999px;
      background:rgba(37,99,235,.09); color:#1e40af; font-size:.88rem; font-weight:700;
    }
    h1{margin:.8rem 0 14px; font-size:clamp(2rem, 4vw, 3.55rem); line-height:1.08}
    .lead{font-size:1.05rem; color:var(--muted); max-width:54rem; margin:0 0 20px}
    .hero-cta{display:flex; flex-wrap:wrap; gap:12px; margin:24px 0 22px}
    .hero-points{display:grid; grid-template-columns:repeat(3,1fr); gap:12px; margin-top:18px}
    .mini-stat{
      padding:16px; border-radius:18px; background:linear-gradient(180deg, #f7faff, #eef5ff); border:1px solid #dfe9fb;
    }
    .mini-stat strong{display:block; font-size:1.25rem; margin-bottom:6px}
    .mini-stat span{font-size:.92rem; color:var(--muted)}
    .hero-side{padding:22px; display:grid; gap:14px}
    .side-top{
      padding:18px; border-radius:18px; background:linear-gradient(135deg, rgba(37,99,235,.08), rgba(21,184,166,.08));
      border:1px solid #d8e7fb;
    }
    .side-top h2,.section-title h2{margin:0 0 10px; font-size:1.55rem}
    .side-top p{margin:0; color:var(--muted)}
    .side-list{display:grid; gap:10px}
    .side-list div{
      padding:12px 14px; border-radius:14px; background:#fff; border:1px solid var(--line); color:var(--text)
    }
    .section{padding:20px 0}
    .section-title{
      display:flex; align-items:end; justify-content:space-between; gap:18px; margin:0 0 16px
    }
    .section-title p{margin:0; color:var(--muted); max-width:60ch}
    .grid-4{display:grid; grid-template-columns:repeat(4,1fr); gap:16px}
    .grid-3{display:grid; grid-template-columns:repeat(3,1fr); gap:16px}
    .card{padding:20px}
    .card h3{margin:0 0 10px; font-size:1.08rem}
    .card p,.card li,.review p,.article p,.faq-item p{color:var(--muted)}
    .tag-cloud{display:flex; flex-wrap:wrap; gap:10px}
    .tag{
      padding:9px 13px; border-radius:999px; background:#fff; border:1px solid var(--line);
      color:#24406f; font-size:.92rem
    }
    .workflow{display:grid; grid-template-columns:repeat(4,1fr); gap:14px}
    .step{
      padding:18px; border-radius:20px; background:linear-gradient(180deg, #ffffff, #f5f9ff);
      border:1px solid #d9e4f3; position:relative
    }
    .step .num{
      width:34px; height:34px; border-radius:11px; background:var(--brand); color:#fff; display:grid; place-items:center;
      font-weight:700; margin-bottom:12px
    }
    .compare{
      width:100%; border-collapse:separate; border-spacing:0; overflow:hidden;
    }
    .compare th,.compare td{
      padding:14px 14px; border-bottom:1px solid var(--line); text-align:left; vertical-align:top
    }
    .compare th{background:#f4f8ff; font-size:.95rem}
    .compare tr:last-child td{border-bottom:none}
    .table-wrap{overflow:auto}
    .rating-box{
      display:grid; grid-template-columns:1fr 1fr; gap:16px
    }
    .score{
      padding:22px; border-radius:20px; background:linear-gradient(135deg, rgba(37,99,235,.08), rgba(255,122,69,.08));
      border:1px solid #d8e7fb
    }
    .score strong{font-size:2rem; display:block; margin:.35rem 0}
    .accordion{display:grid; gap:12px}
    .faq-item{padding:18px}
    .faq-q{
      display:flex; justify-content:space-between; gap:14px; align-items:center; cursor:pointer; font-weight:700;
    }
    .faq-q span:last-child{color:var(--brand); font-size:1.2rem}
    .faq-a{max-height:0; overflow:hidden; transition:max-height .3s ease; padding-top:0}
    .faq-item.open .faq-a{max-height:200px; padding-top:10px}
    .reviews,.articles{display:grid; grid-template-columns:repeat(3,1fr); gap:16px}
    .review .meta{display:flex; align-items:center; justify-content:space-between; gap:10px; margin-bottom:10px}
    .review .role{font-size:.9rem; color:#3d4d69; font-weight:700}
    .review .stars{color:#f59e0b}
    .article time{display:block; font-size:.9rem; color:#6c7a90; margin-bottom:8px}
    .contact-grid{display:grid; grid-template-columns:1fr .82fr; gap:16px; align-items:start}
    .form{
      display:grid; grid-template-columns:repeat(2,1fr); gap:12px
    }
    .field{display:flex; flex-direction:column; gap:7px}
    .field.full{grid-column:1 / -1}
    input,select,textarea{
      width:100%; border:1px solid #cfdaf0; border-radius:14px; background:#fff;
      padding:12px 14px; font:inherit; color:var(--text); outline:none
    }
    input:focus,select:focus,textarea:focus{border-color:var(--brand); box-shadow:0 0 0 4px rgba(37,99,235,.10)}
    textarea{min-height:120px; resize:vertical}
    .footer{
      margin-top:8px; padding:20px 0 26px; border-top:1px solid rgba(219,229,243,.95);
      background:rgba(255,255,255,.72); color:var(--text)
    }
    .footer-grid{display:grid; grid-template-columns:1.2fr .8fr; gap:16px; align-items:start}
    .footer-links{display:flex; flex-wrap:wrap; gap:12px}
    .footer small{color:var(--muted)}
    .fixed-tools{
      position:fixed; right:16px; bottom:16px; z-index:35; display:grid; gap:10px
    }
    .tool{
      width:48px; height:48px; border-radius:16px; background:linear-gradient(135deg, var(--brand), var(--brand-2));
      color:#fff; display:grid; place-items:center; box-shadow:0 14px 24px rgba(37,99,235,.25)
    }
    .kefu-card{
      position:fixed; left:16px; bottom:16px; z-index:35; width:138px; padding:12px;
      background:rgba(255,255,255,.96); border:1px solid var(--line); border-radius:18px; box-shadow:var(--shadow)
    }
    .kefu-card img{border-radius:12px; margin-bottom:8px}
    .kefu-card p{margin:0; font-size:.88rem; color:var(--muted)}
    .scroll-reveal{opacity:0; transform:translateY(18px); transition:.6s ease}
    .scroll-reveal.show{opacity:1; transform:none}
    .pill-row{display:flex; flex-wrap:wrap; gap:10px; margin-top:16px}
    .subtle{color:var(--muted)}
    .note-box{
      padding:18px; border-radius:18px; background:#fff; border:1px dashed #cdd9ef
    }
    @media (max-width: 1080px){
      .hero-grid,.contact-grid,.rating-box{grid-template-columns:1fr}
      .grid-4,.workflow,.reviews,.articles,.grid-3{grid-template-columns:repeat(2,1fr)}
    }
    @media (max-width: 760px){
      .nav-links,.nav-actions{display:none}
      .menu-toggle{display:inline-flex}
      .nav.open .nav-links,.nav.open .nav-actions{
        display:flex; width:100%; flex-direction:column; align-items:flex-start
      }
      .nav.open{align-items:flex-start; flex-wrap:wrap}
      .hero-main{padding:24px}
      .hero-points,.grid-4,.workflow,.reviews,.articles,.grid-3,.form{grid-template-columns:1fr}
      .section-title{flex-direction:column; align-items:flex-start}
      .kefu-card{width:118px}
      .footer-grid{grid-template-columns:1fr}
    }