:root{
      --bg:#f5fbf7;
      --panel:#ffffff;
      --panel-2:#edf8f1;
      --line:#d8eadf;
      --text:#173127;
      --muted:#5d756c;
      --brand:#2cb67d;
      --brand-2:#5fd8b4;
      --accent:#1f8f68;
      --shadow:0 18px 40px rgba(25, 67, 49, .08);
      --radius:22px;
      --radius-sm:16px;
      --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(95,216,180,.16), transparent 28%),
        radial-gradient(circle at top right, rgba(44,182,125,.12), transparent 24%),
        linear-gradient(180deg, #f8fdf9 0%, #f4fbf6 38%, #f7fcf8 100%);
      line-height:1.65;
      overflow-x:hidden;
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(var(--container), calc(100% - 32px));margin:0 auto}
    header{
      position:sticky;top:0;z-index:50;
      backdrop-filter: blur(14px);
      background:rgba(245,251,247,.82);
      border-bottom:1px solid rgba(216,234,223,.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:44px;height:44px;object-fit:contain;border-radius:12px;background:#fff;padding:6px;box-shadow:0 8px 22px rgba(44,182,125,.12)}
    .brand-text{display:flex;flex-direction:column;min-width:0}
    .brand-text strong{font-size:1.02rem;line-height:1.1}
    .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}
    .nav-links a{font-size:.92rem;color:var(--muted);padding:8px 0;position:relative}
    .nav-links a:after{content:"";position:absolute;left:0;bottom:4px;width:0;height:2px;background:var(--brand);transition:.25s}
    .nav-links a:hover:after{width:100%}
    .nav-cta{display:flex;gap:10px;align-items:center}
    .btn{
      display:inline-flex;align-items:center;justify-content:center;gap:8px;
      border:1px solid transparent;border-radius:999px;padding:12px 18px;
      font-weight:700;transition:.25s ease;cursor:pointer;
      box-shadow:none;line-height:1;
    }
    .btn-primary{background:linear-gradient(135deg,var(--brand),var(--accent));color:#fff;box-shadow:0 12px 28px rgba(44,182,125,.18)}
    .btn-ghost{background:#fff;color:var(--text);border-color:var(--line)}
    .btn:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
    .menu-toggle{display:none;background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 12px}
    main{display:block}
    section{padding:38px 0}
    .hero{padding:30px 0 28px}
    .hero-grid{
      display:grid;grid-template-columns:1.15fr .85fr;gap:22px;align-items:stretch;
    }
    .hero-copy{
      background:linear-gradient(180deg, rgba(255,255,255,.88), rgba(237,248,241,.94));
      border:1px solid rgba(216,234,223,.9);
      border-radius:30px;padding:34px;box-shadow:var(--shadow);position:relative;overflow:hidden;
    }
    .hero-copy:before,.hero-copy:after{
      content:"";position:absolute;border-radius:50%;pointer-events:none;
      background:radial-gradient(circle, rgba(95,216,180,.22), transparent 66%);
    }
    .hero-copy:before{width:220px;height:220px;right:-70px;top:-70px}
    .hero-copy:after{width:180px;height:180px;left:-60px;bottom:-70px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;background:#eaf8ef;color:var(--accent);border:1px solid #d4efdf;padding:8px 12px;border-radius:999px;font-size:.86rem;font-weight:700}
    h1{margin:16px 0 12px;font-size:clamp(2rem,4vw,3.6rem);line-height:1.08;letter-spacing:-.02em}
    .lead{font-size:1.05rem;color:var(--muted);max-width:56ch;margin:0 0 22px}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:20px}
    .hero-points{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:22px}
    .mini-stat{
      background:rgba(255,255,255,.84);border:1px solid var(--line);border-radius:18px;padding:16px 14px;
    }
    .mini-stat strong{display:block;font-size:1.2rem;margin-bottom:4px}
    .mini-stat span{font-size:.88rem;color:var(--muted)}
    .hero-side{
      display:grid;gap:18px;
    }
    .info-card{
      background:var(--panel);border:1px solid var(--line);border-radius:30px;padding:22px;box-shadow:var(--shadow)
    }
    .info-card h2,.section-title h2{margin:0 0 10px;font-size:clamp(1.4rem,2vw,2.05rem)}
    .section-title p{margin:0;color:var(--muted);max-width:70ch}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag{background:#edf8f1;border:1px solid #d7eadf;color:#275a43;padding:8px 12px;border-radius:999px;font-size:.88rem}
    .metrics{
      display:grid;grid-template-columns:repeat(4,1fr);gap:16px;
    }
    .metric{
      background:linear-gradient(180deg,#fff, #f4fbf6);border:1px solid var(--line);
      border-radius:24px;padding:20px;box-shadow:var(--shadow);transition:.25s ease;
    }
    .metric:hover,.card:hover,.review:hover,.case:hover{transform:translateY(-4px)}
    .metric strong{display:block;font-size:1.9rem;line-height:1;color:var(--accent)}
    .metric span{display:block;margin-top:8px;color:var(--muted)}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .card{
      background:var(--panel);border:1px solid var(--line);border-radius:24px;padding:22px;box-shadow:var(--shadow);transition:.25s ease
    }
    .card h3{margin:0 0 10px;font-size:1.15rem}
    .card p,.card li{color:var(--muted)}
    .icon{
      width:44px;height:44px;border-radius:14px;display:grid;place-items:center;
      background:linear-gradient(135deg,#dff8ec,#f5fcf8);color:var(--accent);font-weight:800;margin-bottom:14px
    }
    .split{
      display:grid;grid-template-columns:1fr 1fr;gap:18px;align-items:start
    }
    .timeline{display:grid;gap:12px}
    .step{
      display:flex;gap:14px;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:20px;padding:16px 18px
    }
    .step b{
      min-width:34px;height:34px;border-radius:50%;display:grid;place-items:center;background:#e9f8ef;color:var(--accent)
    }
    .table-wrap{overflow-x:auto;background:#fff;border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow)}
    table{width:100%;border-collapse:collapse;min-width:760px}
    th,td{padding:16px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
    th{background:#effaf3;font-size:.95rem}
    td{color:var(--muted)}
    .rating{
      display:flex;flex-wrap:wrap;gap:14px;align-items:center
    }
    .stars{color:#f6b300;font-size:1.2rem;letter-spacing:2px}
    .score{
      background:linear-gradient(135deg,#ecfbf3,#fff);border:1px solid var(--line);
      padding:18px 20px;border-radius:22px;min-width:240px
    }
    details{
      background:#fff;border:1px solid var(--line);border-radius:18px;padding:16px 18px;box-shadow:var(--shadow)
    }
    details + details{margin-top:12px}
    summary{cursor:pointer;font-weight:700;list-style:none}
    summary::-webkit-details-marker{display:none}
    summary:after{content:"+";float:right;color:var(--accent);font-size:1.2rem}
    details[open] summary:after{content:"−"}
    .reviews{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:12px}
    .review .role{color:var(--accent);font-weight:700;font-size:.92rem}
    .review .quote{color:var(--muted);margin:0}
    .article-list{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .article a{display:block;color:var(--text);font-weight:700;margin-bottom:8px}
    .article span{color:var(--muted);font-size:.92rem}
    .form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
    .form{
      background:var(--panel);border:1px solid var(--line);border-radius:28px;padding:24px;box-shadow:var(--shadow)
    }
    label{display:block;font-weight:700;font-size:.92rem;margin-bottom:8px;color:#28463a}
    input,select,textarea{
      width:100%;padding:14px 15px;border:1px solid #d9e8df;border-radius:14px;background:#fff;color:var(--text);font:inherit;
      outline:none;transition:.2s
    }
    input:focus,select:focus,textarea:focus{border-color:var(--brand);box-shadow:0 0 0 4px rgba(44,182,125,.12)}
    textarea{min-height:120px;resize:vertical}
    .form-actions{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin-top:16px}
    .footer{
      background:#eef8f1;border-top:1px solid var(--line);color:var(--text);padding:28px 0 24px
    }
    .footer-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:20px}
    .footer a{color:#1f6c50}
    .footer small{color:var(--muted)}
    .floating{
      position:fixed;right:16px;bottom:16px;z-index:60;display:grid;gap:10px
    }
    .float-btn{
      width:52px;height:52px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(135deg,var(--brand),var(--accent));color:#fff;box-shadow:0 16px 30px rgba(44,182,125,.25)
    }
    .chat-box{
      position:fixed;right:16px;bottom:82px;z-index:60;width:min(320px, calc(100vw - 32px));
      background:#fff;border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow);padding:16px;display:none
    }
    .chat-box.open{display:block}
    .chat-box img{width:100%;border-radius:16px;border:1px solid var(--line)}
    .backtop{position:fixed;left:16px;bottom:16px;z-index:60;opacity:0;pointer-events:none;transition:.25s}
    .backtop.show{opacity:1;pointer-events:auto}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:18px}
    .subtle{color:var(--muted)}
    .link-list{display:flex;flex-wrap:wrap;gap:12px}
    .link-list a{padding:10px 14px;border-radius:999px;background:#fff;border:1px solid var(--line)}
    .about-panel{display:grid;grid-template-columns:1.05fr .95fr;gap:18px;align-items:stretch}
    .image-card{background:#fff;border:1px solid var(--line);border-radius:26px;padding:14px;box-shadow:var(--shadow)}
    .image-card img{border-radius:18px;width:100%;height:auto}
    .scroll-reveal{opacity:0;transform:translateY(18px);transition:.6s ease}
    .scroll-reveal.visible{opacity:1;transform:none}
    @media (max-width: 980px){
      .hero-grid,.about-panel,.split,.footer-grid,.grid-3,.reviews,.article-list,.metrics{grid-template-columns:1fr 1fr}
      .hero-points,.form-grid{grid-template-columns:1fr 1fr}
      .nav-links{display:none}
      .menu-toggle{display:inline-flex}
      .nav.open .nav-links{
        display:flex;position:absolute;left:16px;right:16px;top:70px;flex-direction:column;gap:0;background:#fff;border:1px solid var(--line);
        padding:12px;border-radius:18px;box-shadow:var(--shadow);align-items:flex-start
      }
      .nav.open .nav-links a{width:100%;padding:12px 10px}
      .nav.open .nav-cta{display:none}
    }
    @media (max-width: 720px){
      .hero-grid,.about-panel,.split,.footer-grid,.grid-3,.reviews,.article-list,.metrics,.hero-points,.form-grid{grid-template-columns:1fr}
      .hero-copy,.info-card,.card,.form{padding:20px}
      section{padding:28px 0}
      .section-head{flex-direction:column;align-items:flex-start}
    }