:root{
      --bg:#fffaf4;
      --bg2:#fff4ea;
      --card:#ffffff;
      --card2:#fff8f2;
      --text:#1f2a37;
      --muted:#5b6777;
      --brand:#ff4d6d;
      --brand2:#ff8a00;
      --line:#eedfd4;
      --shadow:0 14px 40px rgba(31,42,55,.08);
      --shadow2:0 10px 26px rgba(255,77,109,.14);
      --radius:20px;
      --radius2:28px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--text);background:
      radial-gradient(circle at top left, rgba(255,77,109,.10), transparent 28%),
      radial-gradient(circle at top right, rgba(255,138,0,.10), transparent 24%),
      linear-gradient(180deg,var(--bg),#fff 42%, var(--bg2));
    }
    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:40;background:rgba(255,250,244,.82);backdrop-filter:blur(12px);border-bottom:1px solid rgba(238,223,212,.75)}
    .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;box-shadow:0 8px 20px rgba(31,42,55,.08)}
    .brand strong{font-size:1.04rem;letter-spacing:.3px}
    .brand span{display:block;font-size:.82rem;color:var(--muted);margin-top:2px}
    .menu{display:flex;align-items:center;gap:14px;flex-wrap:wrap;justify-content:flex-end}
    .menu a{font-size:.95rem;color:#334155;padding:8px 10px;border-radius:999px;transition:.25s}
    .menu a:hover{background:#fff;color:var(--brand);box-shadow:0 8px 20px rgba(255,77,109,.12)}
    .nav-actions{display:flex;align-items:center;gap:10px}
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:999px;padding:12px 18px;font-weight:700;cursor:pointer;transition:.25s;white-space:nowrap}
    .btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;box-shadow:var(--shadow2)}
    .btn-primary:hover{transform:translateY(-2px)}
    .btn-ghost{background:#fff;color:var(--text);border:1px solid var(--line)}
    .btn-ghost:hover{transform:translateY(-2px);border-color:#ffb39f}
    .burger{display:none;background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 12px}
    main{overflow:hidden}
    section{padding:72px 0}
    .hero{padding:44px 0 58px}
    .hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:24px;align-items:stretch}
    .hero-copy{background:linear-gradient(180deg, rgba(255,255,255,.92), rgba(255,248,242,.88));border:1px solid rgba(238,223,212,.8);border-radius:var(--radius2);padding:34px;box-shadow:var(--shadow);position:relative;overflow:hidden}
    .hero-copy:before{content:"";position:absolute;inset:auto -40px -40px auto;width:180px;height:180px;background:radial-gradient(circle, rgba(255,77,109,.14), transparent 70%);border-radius:50%}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;background:#fff1f0;color:#cc1839;border:1px solid #ffd2da;border-radius:999px;padding:8px 12px;font-size:.9rem;font-weight:700}
    h1{margin:18px 0 14px;font-size:clamp(2rem,4vw,3.6rem);line-height:1.08;letter-spacing:-.03em}
    .hero-copy p{margin:0 0 22px;color:var(--muted);font-size:1.03rem;line-height:1.85;max-width:62ch}
    .hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin:20px 0 18px}
    .hero-points{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:20px}
    .point{background:#fff;border:1px solid var(--line);border-radius:18px;padding:14px 16px}
    .point b{display:block;font-size:1.02rem;margin-bottom:6px}
    .point span{color:var(--muted);font-size:.92rem;line-height:1.5}
    .hero-side{display:grid;gap:14px}
    .side-card{background:linear-gradient(180deg,#fff,#fffaf5);border:1px solid var(--line);border-radius:var(--radius2);padding:22px;box-shadow:var(--shadow)}
    .side-card h3,.section-title h2{margin:0 0 10px;font-size:1.45rem}
    .side-card p,.section-title p{margin:0;color:var(--muted);line-height:1.8}
    .stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .stat,.service-card,.case-card,.review-card,.article-card,.compare-card,.pricing-card,.network-card,.help-card,.value-card,.faq-item,.timeline-item{background:var(--card);border:1px solid var(--line);border-radius:22px;box-shadow:0 10px 30px rgba(31,42,55,.05)}
    .stat{padding:20px}
    .stat b{display:block;font-size:1.55rem;margin-bottom:6px}
    .stat span{color:var(--muted)}
    .section-title{display:flex;align-items:end;justify-content:space-between;gap:18px;margin-bottom:22px}
    .section-title .sub{max-width:68ch}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .service-card,.value-card,.help-card{padding:22px}
    .chip{display:inline-flex;align-items:center;gap:6px;padding:7px 11px;border-radius:999px;background:#fff2f4;color:#b81c3d;font-size:.86rem;font-weight:700;margin-bottom:12px}
    .service-card h3,.value-card h3,.help-card h3,.case-card h3,.review-card h3,.article-card h3,.pricing-card h3,.network-card h3{margin:0 0 10px;font-size:1.08rem}
    .service-card ul,.help-card ul,.value-list,.article-card ul,.timeline-list{margin:12px 0 0;padding:0;list-style:none}
    .service-card li,.help-card li,.article-card li,.value-list li{padding:8px 0;border-top:1px dashed #f0e2d8;color:#425466;line-height:1.6}
    .value-list li:first-child,.service-card li:first-child,.help-card li:first-child,.article-card li:first-child{border-top:0;padding-top:0}
    .banner-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
    .banner-row img{width:100%;border-radius:22px;border:1px solid var(--line);box-shadow:var(--shadow);object-fit:cover}
    .timeline-list li{padding:14px 0;border-top:1px solid #f0e2d8}
    .timeline-list strong{display:block;margin-bottom:6px}
    .compare-wrap{overflow-x:auto;border-radius:22px;border:1px solid var(--line);background:#fff}
    table{width:100%;border-collapse:collapse;min-width:900px;background:#fff}
    th,td{padding:16px 14px;text-align:left;border-bottom:1px solid #f3e8df;vertical-align:top}
    th{background:#fff4f1;font-size:.95rem}
    td{color:#334155;line-height:1.7}
    .highlight{color:#c51a3d;font-weight:800}
    .pricing-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .pricing-card{padding:22px;position:relative;overflow:hidden}
    .pricing-card.featured{border-color:#ffc0c8;box-shadow:0 14px 40px rgba(255,77,109,.10)}
    .price{font-size:2rem;font-weight:800;margin:8px 0 14px}
    .small{color:var(--muted);font-size:.92rem}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag-cloud span{padding:10px 13px;border-radius:999px;background:#fff;border:1px solid var(--line);color:#334155}
    .faq-list{display:grid;gap:12px}
    .faq-item{overflow:hidden}
    .faq-q{width:100%;background:transparent;border:0;padding:18px 20px;display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:1rem;font-weight:700;color:var(--text);cursor:pointer;text-align:left}
    .faq-a{max-height:0;overflow:hidden;transition:max-height .28s ease;padding:0 20px;color:var(--muted);line-height:1.8}
    .faq-item.open .faq-a{padding-bottom:18px;max-height:220px}
    .reviews{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .review-card{padding:20px}
    .review-card .meta{display:flex;justify-content:space-between;gap:10px;color:var(--muted);font-size:.88rem;margin-bottom:12px}
    .articles{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .article-card{padding:20px}
    .article-card .meta{display:flex;flex-wrap:wrap;gap:10px;color:var(--muted);font-size:.88rem;margin-bottom:10px}
    .form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
    form{background:var(--card);border:1px solid var(--line);border-radius:26px;padding:22px;box-shadow:var(--shadow)}
    label{display:block;font-size:.92rem;font-weight:700;margin:0 0 8px}
    input,select,textarea{width:100%;border:1px solid #e8ddd3;border-radius:14px;padding:14px 15px;font:inherit;color:var(--text);background:#fff}
    textarea{min-height:120px;resize:vertical}
    .form-actions{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin-top:14px}
    .contact-box{background:linear-gradient(180deg,#fff,#fff7f4);border:1px solid var(--line);border-radius:26px;padding:22px;box-shadow:var(--shadow)}
    .contact-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:16px;align-items:start}
    footer{padding:26px 0 34px;border-top:1px solid var(--line);background:#fffaf6;color:#334155}
    footer a{color:#1f4f8f}
    .footer-grid{display:grid;grid-template-columns:1.2fr .8fr 1fr;gap:16px;align-items:start}
    .footer-links{display:flex;flex-wrap:wrap;gap:10px}
    .footer-links a{padding:8px 12px;background:#fff;border:1px solid var(--line);border-radius:999px}
    .floating{position:fixed;right:16px;bottom:16px;z-index:50;display:grid;gap:10px}
    .float-btn{display:inline-flex;align-items:center;justify-content:center;width:48px;height:48px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;box-shadow:var(--shadow2);border:0;cursor:pointer}
    .kefu-pop{position:fixed;right:16px;bottom:74px;background:#fff;border:1px solid var(--line);border-radius:20px;padding:14px;box-shadow:var(--shadow);width:240px;display:none}
    .kefu-pop img{width:100%;border-radius:14px;border:1px solid var(--line)}
    .reveal{opacity:0;transform:translateY(16px);transition:.6s ease}
    .reveal.show{opacity:1;transform:none}
    .mobile-only{display:none}
    @media (max-width: 980px){
      .hero-grid,.stats,.grid-4,.grid-3,.reviews,.articles,.pricing-grid,.footer-grid,.contact-grid,.form-grid,.banner-row{grid-template-columns:1fr}
      .section-title{flex-direction:column;align-items:flex-start}
      .menu{display:none;position:absolute;left:16px;right:16px;top:66px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:12px;box-shadow:var(--shadow);flex-direction:column;align-items:stretch}
      .menu.open{display:flex}
      .menu a{padding:12px 14px}
      .burger{display:inline-flex}
      .nav{position:relative}
      .hero{padding-top:26px}
      .hero-copy{padding:24px}
      .hero-points{grid-template-columns:1fr}
      .mobile-only{display:inline-flex}
    }