:root{
      --bg:#f7f3ec;
      --panel:#ffffff;
      --panel-2:#fff8ef;
      --text:#1f2937;
      --muted:#667085;
      --line:#e8dfd2;
      --brand:#1f6feb;
      --brand-2:#7c3aed;
      --accent:#ff7a59;
      --good:#0f9d58;
      --shadow:0 18px 45px rgba(31,41,55,.08);
      --shadow-soft:0 10px 25px rgba(31,41,55,.06);
      --radius:20px;
      --radius-sm:14px;
      --max:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:system-ui,-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;
      background:
        radial-gradient(circle at top left, rgba(31,111,235,.10), transparent 28%),
        radial-gradient(circle at top right, rgba(255,122,89,.10), transparent 24%),
        linear-gradient(180deg, #fbf8f3 0%, #f7f3ec 40%, #f8f5f0 100%);
      color:var(--text);
      line-height:1.6;
    }
    a{color:var(--brand);text-decoration:none}
    a:hover{text-decoration:none}
    img{display:block;max-width:100%}
    .container{max-width:var(--max);margin:0 auto;padding:0 20px}
    .site-header{
      position:sticky;top:0;z-index:50;
      backdrop-filter:blur(14px);
      background:rgba(247,243,236,.82);
      border-bottom:1px solid rgba(232,223,210,.7);
    }
    .nav-wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:72px}
    .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;box-shadow:var(--shadow-soft)}
    .brand-text{display:flex;flex-direction:column;min-width:0}
    .brand-text strong{font-size:1.02rem;line-height:1.2}
    .brand-text span{font-size:.86rem;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
    .nav-toggle{display:none;border:1px solid var(--line);background:#fff;border-radius:12px;padding:10px 12px;color:var(--text)}
    .nav-links{display:flex;align-items:center;gap:16px;flex-wrap:wrap;justify-content:flex-end}
    .nav-links a{color:var(--text);font-size:.95rem;padding:8px 0;opacity:.92}
    .nav-actions{display:flex;align-items:center;gap:10px}
    .btn{
      display:inline-flex;align-items:center;justify-content:center;gap:8px;
      padding:12px 16px;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),var(--brand-2));color:#fff;box-shadow:0 14px 24px rgba(31,111,235,.18)}
    .btn-primary:hover{transform:translateY(-2px);box-shadow:0 18px 30px rgba(31,111,235,.22)}
    .btn-ghost{background:#fff;color:var(--text);border-color:var(--line)}
    .btn-ghost:hover{transform:translateY(-2px);border-color:#cdbfae;box-shadow:var(--shadow-soft)}
    main{display:block}
    section{padding:72px 0}
    .hero{padding:44px 0 54px}
    .hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:28px;align-items:stretch}
    .hero-panel{
      position:relative;overflow:hidden;border:1px solid rgba(232,223,210,.9);
      background:linear-gradient(135deg, rgba(255,255,255,.95), rgba(255,248,239,.96));
      border-radius:28px;box-shadow:var(--shadow);padding:34px
    }
    .hero-panel::before,.hero-panel::after{
      content:"";position:absolute;border-radius:50%;pointer-events:none
    }
    .hero-panel::before{width:220px;height:220px;right:-80px;top:-80px;background:radial-gradient(circle, rgba(31,111,235,.16), transparent 70%)}
    .hero-panel::after{width:180px;height:180px;left:-80px;bottom:-80px;background:radial-gradient(circle, rgba(255,122,89,.16), transparent 72%)}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:#eef4ff;color:#2457a6;font-weight:700;font-size:.9rem}
    h1{font-size:clamp(2rem,4vw,3.6rem);line-height:1.1;margin:16px 0 14px;letter-spacing:-.02em}
    .lead{font-size:1.06rem;color:var(--muted);max-width:58ch;margin:0 0 22px}
    .hero-cta{display:flex;flex-wrap:wrap;gap:12px;margin:24px 0 18px}
    .hero-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:22px}
    .mini-card{background:rgba(255,255,255,.82);border:1px solid var(--line);border-radius:18px;padding:14px 14px 13px}
    .mini-card strong{display:block;font-size:1rem;margin-bottom:4px}
    .mini-card span{font-size:.92rem;color:var(--muted)}
    .hero-side{
      display:grid;gap:16px;
    }
    .stats{
      display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px
    }
    .stat{
      background:linear-gradient(180deg,#fff, #fff8ef);
      border:1px solid var(--line);border-radius:22px;padding:20px;box-shadow:var(--shadow-soft)
    }
    .stat strong{display:block;font-size:1.8rem;line-height:1;color:#0f172a}
    .stat span{display:block;margin-top:8px;color:var(--muted);font-size:.93rem}
    .hero-figure{
      border:1px solid var(--line);border-radius:24px;overflow:hidden;background:linear-gradient(160deg,#fff,#fff4ea);
      padding:18px;box-shadow:var(--shadow-soft)
    }
    .hero-figure .figure-top{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-bottom:12px}
    .hero-figure .badge{padding:7px 10px;border-radius:999px;background:#fff0e8;color:#b45309;font-weight:700;font-size:.84rem}
    .hero-figure .bars{display:grid;gap:10px}
    .bar{height:12px;border-radius:999px;background:linear-gradient(90deg,#dbeafe,#c4b5fd,#fed7aa)}
    .bar:nth-child(1){width:86%}.bar:nth-child(2){width:72%}.bar:nth-child(3){width:94%}.bar:nth-child(4){width:68%}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:18px;margin-bottom:24px}
    .section-head h2{font-size:clamp(1.5rem,2.6vw,2.35rem);margin:0;line-height:1.15}
    .section-head p{margin:0;color:var(--muted);max-width:64ch}
    .grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
    .grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}
    .card{
      background:linear-gradient(180deg,#fff, #fffaf3);
      border:1px solid var(--line);border-radius:22px;padding:22px;box-shadow:var(--shadow-soft);
      transition:transform .25s ease, box-shadow .25s ease, border-color .25s ease;
    }
    .card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#d8c9b7}
    .card h3{margin:0 0 10px;font-size:1.08rem}
    .card p{margin:0;color:var(--muted)}
    .pill-row{display:flex;flex-wrap:wrap;gap:10px}
    .pill{padding:9px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);color:#374151;font-size:.92rem}
    .platform-intro{
      display:grid;grid-template-columns:1.08fr .92fr;gap:18px;align-items:stretch
    }
    .feature-list{display:grid;gap:12px;margin-top:16px}
    .feature{display:flex;gap:12px;align-items:flex-start;padding:14px 0;border-top:1px dashed #eadfce}
    .feature:first-child{border-top:none;padding-top:0}
    .dot{width:12px;height:12px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--accent));margin-top:6px;flex:0 0 auto}
    .compare-wrap,.table-wrap{overflow-x:auto}
    table{width:100%;border-collapse:collapse;min-width:860px;background:#fff;border:1px solid var(--line);border-radius:20px;overflow:hidden;box-shadow:var(--shadow-soft)}
    th,td{padding:16px 14px;border-bottom:1px solid #eee6d9;text-align:left;vertical-align:top}
    th{background:#fff7ee;font-size:.95rem}
    tr:last-child td{border-bottom:none}
    .highlight{background:#f2f7ff;font-weight:700}
    .timeline{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
    .step{position:relative;padding:22px 20px 20px 20px;background:linear-gradient(180deg,#fff,#fff8ef);border:1px solid var(--line);border-radius:22px}
    .step .num{display:inline-flex;width:36px;height:36px;align-items:center;justify-content:center;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;font-weight:800;margin-bottom:12px}
    .step h3{margin:0 0 8px}
    .step p{margin:0;color:var(--muted)}
    .faq{display:grid;gap:12px}
    details{background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow-soft);overflow:hidden}
    summary{list-style:none;cursor:pointer;padding:18px 18px;font-weight:700;display:flex;align-items:center;justify-content:space-between;gap:12px}
    summary::-webkit-details-marker{display:none}
    details .answer{padding:0 18px 18px;color:var(--muted)}
    .reviews,.articles,.network,.pricing,.tags{display:grid;gap:16px}
    .review-meta{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:10px}
    .stars{color:#f59e0b;letter-spacing:2px;font-size:1rem}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag-cloud .pill{background:#fff;box-shadow:0 6px 16px rgba(31,41,55,.04)}
    .form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
    .form-control{display:flex;flex-direction:column;gap:8px}
    label{font-weight:700;font-size:.95rem}
    input,select,textarea{
      width:100%;border:1px solid #d8ccbb;background:#fff;border-radius:14px;padding:13px 14px;
      font:inherit;color:var(--text);outline:none;transition:border-color .2s ease, box-shadow .2s ease
    }
    input:focus,select:focus,textarea:focus{border-color:#8ab4ff;box-shadow:0 0 0 4px rgba(31,111,235,.12)}
    textarea{min-height:132px;resize:vertical}
    .form-wide{grid-column:1/-1}
    .submit-row{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin-top:6px}
    .note{color:var(--muted);font-size:.93rem}
    .floating{
      position:fixed;right:18px;bottom:18px;z-index:60;display:grid;gap:10px
    }
    .float-btn{
      display:inline-flex;align-items:center;justify-content:center;min-width:48px;height:48px;padding:0 15px;border-radius:999px;
      background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;box-shadow:0 14px 30px rgba(31,111,235,.22);
      border:none;cursor:pointer;font-weight:700
    }
    .float-btn.secondary{background:#fff;color:var(--text);border:1px solid var(--line)}
    .kefu-card{
      position:fixed;right:18px;bottom:132px;z-index:58;width:250px;display:none;
      background:#fff;border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow);overflow:hidden
    }
    .kefu-card.open{display:block}
    .kefu-card .head{padding:14px 16px;background:#fff7ee;font-weight:800}
    .kefu-card .body{padding:16px}
    .kefu-card .body img{width:100%;border-radius:16px;border:1px solid var(--line);background:#fff}
    .kefu-card .body p{margin:12px 0 0;color:var(--muted);font-size:.93rem}
    footer{
      padding:34px 0 40px;background:#1f2937;color:#eef2ff;margin-top:18px
    }
    footer a{color:#dbeafe}
    .footer-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:18px;align-items:start}
    .footer-links{display:flex;flex-wrap:wrap;gap:12px}
    .footer-card{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.10);border-radius:18px;padding:18px}
    .small{font-size:.92rem;color:#cbd5e1}
    .mobile-menu{display:none}
    .scroll-top{opacity:0;transform:translateY(10px);pointer-events:none}
    .scroll-top.show{opacity:1;transform:translateY(0);pointer-events:auto}
    .reveal{opacity:0;transform:translateY(16px);transition:opacity .6s ease, transform .6s ease}
    .reveal.in{opacity:1;transform:none}
    @media (max-width: 1024px){
      .hero-grid,.platform-intro,.footer-grid{grid-template-columns:1fr}
      .grid-4,.timeline{grid-template-columns:repeat(2,minmax(0,1fr))}
      .grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}
      .section-head{align-items:flex-start;flex-direction:column}
    }
    @media (max-width: 760px){
      .nav-toggle{display:inline-flex}
      .nav-links,.nav-actions{display:none}
      .nav-links.open{display:flex;position:absolute;left:20px;right:20px;top:76px;flex-direction:column;align-items:flex-start;gap:8px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:14px;box-shadow:var(--shadow)}
      .nav-links.open a{padding:10px 4px}
      .nav-actions.open{display:flex;position:absolute;right:20px;top:76px;flex-direction:column;align-items:stretch;background:#fff;border:1px solid var(--line);border-radius:18px;padding:14px;box-shadow:var(--shadow)}
      .hero-panel{padding:24px}
      .hero-list,.stats,.grid-3,.grid-4,.timeline,.form-grid{grid-template-columns:1fr}
      .hero-figure,.card,.stat,.step{border-radius:18px}
      section{padding:58px 0}
      .floating{right:12px;bottom:12px}
      .kefu-card{right:12px;bottom:124px;width:min(88vw,280px)}
    }