*{
      margin:0;
      padding:0;
      box-sizing:border-box;
    }
    :root{
      --brand:#FF4D6D;
      --brand-dark:#C9184A;
      --brand-light:#FFE5EB;
      --accent:#FFB703;
      --accent-light:#FFF3D6;
      --ink:#1E1E2A;
      --ink-soft:#3D3D4E;
      --muted:#6B6B7B;
      --bg:#FFF8F5;
      --bg-soft:#FFF1EC;
      --card:#FFFFFF;
      --border:#FFD6DD;
      --shadow:0 12px 32px rgba(255,77,109,0.12);
      --radius:16px;
      --radius-sm:10px;
      --container:1200px;
      --gap:24px;
    }
    body{
      font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
      background:var(--bg);
      color:var(--ink);
      line-height:1.6;
      font-size:16px;
      -webkit-font-smoothing:antialiased;
    }
    .container{
      width:100%;
      max-width:var(--container);
      margin:0 auto;
      padding:0 24px;
    }
    a{
      color:var(--brand-dark);
      text-decoration:none;
      transition:color .2s;
    }
    a:hover{
      color:var(--brand);
    }
    img{
      max-width:100%;
      height:auto;
      display:block;
    }
    .ai-page-logo{
      max-height:44px;
      width:auto;
    }
    /* header */
    .site-header{
      position:sticky;
      top:0;
      z-index:50;
      background:rgba(255,248,245,0.94);
      backdrop-filter:blur(10px);
      border-bottom:1px solid var(--border);
    }
    .header-inner{
      display:flex;
      align-items:center;
      justify-content:space-between;
      padding:14px 0;
      gap:16px;
    }
    .brand{
      display:flex;
      align-items:center;
      gap:10px;
      font-weight:700;
      font-size:1.2rem;
      color:var(--ink);
    }
    .brand-off{
      color:var(--brand);
      font-size:.8rem;
      font-weight:600;
      letter-spacing:1px;
      display: none;
    }
    .nav-links{
      display:flex;
      align-items:center;
      gap:0;
      flex-wrap:wrap;
    }
    .nav-links a{
      padding:8px 12px;
      font-size:.95rem;
      color:var(--ink-soft);
      font-weight:500;
      border-radius:8px;
      transition:background .2s,color .2s;
    }
    .nav-links a:hover{
      background:var(--brand-light);
      color:var(--brand-dark);
    }
    .header-cta{
      display:flex;
      align-items:center;
      gap:12px;
    }
    .btn{
      display:inline-flex;
      align-items:center;
      justify-content:center;
      gap:6px;
      padding:11px 22px;
      border-radius:40px;
      font-weight:600;
      font-size:.95rem;
      transition:all .22s ease;
      border:2px solid transparent;
      cursor:pointer;
      text-align:center;
      white-space:nowrap;
    }
    .btn-primary{
      background:linear-gradient(135deg,var(--brand),var(--brand-dark));
      color:#fff;
      box-shadow:0 8px 20px rgba(201,24,74,0.28);
    }
    .btn-primary:hover{
      transform:translateY(-2px);
      box-shadow:0 12px 28px rgba(201,24,74,0.38);
      color:#fff;
    }
    .btn-outline{
      background:transparent;
      border-color:var(--brand);
      color:var(--brand-dark);
    }
    .btn-outline:hover{
      background:var(--brand-light);
      transform:translateY(-2px);
    }
    .btn-accent{
      background:var(--accent);
      color:#3D2B00;
      box-shadow:0 8px 20px rgba(255,183,3,0.35);
    }
    .btn-accent:hover{
      background:#FFA500;
      transform:translateY(-2px);
    }
    .menu-toggle{
      display:none;
      background:none;
      border:none;
      font-size:1.6rem;
      color:var(--ink);
      cursor:pointer;
      line-height:1;
      padding:4px 8px;
    }
    /* hero */
    .hero{
      position:relative;
      padding:70px 0 60px;
      background:linear-gradient(160deg,#FFF0F3 0%,#FFF8F5 40%,#FFE5EB 100%);
      overflow:hidden;
    }
    .hero-bg-shape{
      position:absolute;
      border-radius:50%;
      filter:blur(80px);
      opacity:.4;
      pointer-events:none;
    }
    .hero-bg-shape.s1{
      width:420px;height:420px;
      background:var(--brand);
      top:-120px;right:-80px;
    }
    .hero-bg-shape.s2{
      width:300px;height:300px;
      background:var(--accent);
      bottom:-100px;left:-60px;
      opacity:.25;
    }
    .hero-content{
      position:relative;
      z-index:2;
      display:grid;
      grid-template-columns:1.1fr .9fr;
      gap:48px;
      align-items:center;
    }
    .hero-badge{
      display:inline-flex;
      align-items:center;
      gap:8px;
      background:rgba(255,77,109,0.09);
      border:1px solid var(--border);
      color:var(--brand-dark);
      font-size:.85rem;
      font-weight:600;
      padding:6px 16px;
      border-radius:30px;
      margin-bottom:22px;
    }
    .hero-badge::before{
      content:'';
      width:8px;height:8px;
      border-radius:50%;
      background:var(--brand);
    }
    h1{
      font-size:clamp(2rem,4.4vw,3.2rem);
      line-height:1.2;
      font-weight:800;
      letter-spacing:-.02em;
      color:var(--ink);
      margin-bottom:20px;
    }
    .hero-highlight{
      color:var(--brand-dark);
      position:relative;
      display:inline-block;
    }
    .hero-highlight::after{
      content:'';
      position:absolute;
      left:0;bottom:4px;
      width:100%;height:12px;
      background:rgba(255,183,3,0.45);
      border-radius:4px;
      z-index:-1;
    }
    .hero-desc{
      font-size:1.05rem;
      color:var(--ink-soft);
      max-width:560px;
      margin-bottom:32px;
      line-height:1.7;
    }
    .hero-actions{
      display:flex;
      flex-wrap:wrap;
      gap:14px;
      align-items:center;
    }
    .hero-stats{
      display:flex;
      gap:40px;
      margin-top:36px;
      flex-wrap:wrap;
    }
    .hero-stat-item strong{
      display:block;
      font-size:1.6rem;
      font-weight:800;
      color:var(--brand-dark);
      line-height:1.2;
    }
    .hero-stat-item span{
      font-size:.85rem;
      color:var(--muted);
    }
    .hero-visual{
      display:flex;
      flex-direction:column;
      gap:16px;
      position:relative;
    }
    .hero-card-stack{
      background:var(--card);
      border:1px solid var(--border);
      border-radius:var(--radius);
      padding:22px;
      box-shadow:var(--shadow);
      transition:transform .3s ease,box-shadow .3s ease;
    }
    .hero-card-stack:hover{
      transform:translateY(-4px);
      box-shadow:0 20px 40px rgba(255,77,109,0.18);
    }
    .stack-row{
      display:flex;
      align-items:center;
      gap:14px;
      padding:10px 0;
      border-bottom:1px dashed var(--border);
    }
    .stack-row:last-child{
      border-bottom:none;
    }
    .stack-icon{
      width:38px;height:38px;
      border-radius:10px;
      background:var(--brand-light);
      display:flex;
      align-items:center;
      justify-content:center;
      font-weight:700;
      color:var(--brand-dark);
      font-size:.85rem;
      flex-shrink:0;
    }
    .stack-text{
      font-size:.92rem;
      font-weight:500;
      color:var(--ink-soft);
    }
    .stack-meta{
      margin-left:auto;
      font-size:.78rem;
      color:var(--muted);
      white-space:nowrap;
    }
    .mini-badge{
      display:inline-block;
      background:var(--accent-light);
      color:#8B5E00;
      font-size:.72rem;
      font-weight:600;
      padding:2px 10px;
      border-radius:20px;
      margin-left:8px;
    }
    /* sections common */
    section{
      padding:64px 0;
      position:relative;
    }
    .section-head{
      text-align:center;
      max-width:760px;
      margin:0 auto 44px;
    }
    .section-eyebrow{
      display:inline-block;
      color:var(--brand-dark);
      font-weight:700;
      font-size:.82rem;
      letter-spacing:2px;
      text-transform:uppercase;
      margin-bottom:12px;
      background:var(--brand-light);
      padding:4px 14px;
      border-radius:20px;
    }
    .section-title{
      font-size:clamp(1.6rem,2.8vw,2.2rem);
      font-weight:800;
      line-height:1.3;
      color:var(--ink);
      margin-bottom:14px;
    }
    .section-sub{
      color:var(--muted);
      font-size:1rem;
      line-height:1.7;
    }
    /* fade in */
    .fade-in{
      opacity:0;
      transform:translateY(26px);
      transition:opacity .65s ease,transform .65s ease;
    }
    .fade-in.visible{
      opacity:1;
      transform:translateY(0);
    }
    /* about */
    .about-grid{
      display:grid;
      grid-template-columns:1fr 1fr;
      gap:36px;
      align-items:start;
    }
    .about-text p{
      color:var(--ink-soft);
      margin-bottom:16px;
      line-height:1.8;
    }
    .about-highlights{
      display:flex;
      flex-wrap:wrap;
      gap:10px;
      margin-top:22px;
    }
    .tag-pill{
      background:var(--card);
      border:1px solid var(--border);
      padding:8px 16px;
      border-radius:30px;
      font-size:.85rem;
      font-weight:500;
      color:var(--ink-soft);
      transition:all .2s;
    }
    .tag-pill:hover{
      border-color:var(--brand);
      background:var(--brand-light);
      color:var(--brand-dark);
    }
    .about-card{
      background:var(--card);
      border:1px solid var(--border);
      border-radius:var(--radius);
      padding:28px;
      box-shadow:var(--shadow);
    }
    .about-card h3{
      font-size:1.1rem;
      margin-bottom:16px;
      color:var(--ink);
    }
    .about-list{
      list-style:none;
    }
    .about-list li{
      display:flex;
      gap:12px;
      padding:10px 0;
      border-bottom:1px solid var(--bg-soft);
      font-size:.92rem;
      color:var(--ink-soft);
      align-items:flex-start;
    }
    .about-list li:last-child{
      border-bottom:none;
    }
    .dot-icon{
      width:22px;height:22px;
      border-radius:50%;
      background:var(--brand-light);
      color:var(--brand-dark);
      font-size:.7rem;
      display:flex;
      align-items:center;
      justify-content:center;
      flex-shrink:0;
      font-weight:700;
      margin-top:1px;
    }
    /* services */
    .services-grid{
      display:grid;
      grid-template-columns:repeat(3,1fr);
      gap:var(--gap);
    }
    .service-card{
      background:var(--card);
      border:1px solid var(--border);
      border-radius:var(--radius);
      padding:28px 24px;
      transition:transform .28s ease,box-shadow .28s ease;
      position:relative;
      overflow:hidden;
    }
    .service-card::before{
      content:'';
      position:absolute;
      top:0;left:0;
      width:100%;height:4px;
      background:linear-gradient(90deg,var(--brand),var(--accent));
      opacity:0;
      transition:opacity .28s;
    }
    .service-card:hover{
      transform:translateY(-6px);
      box-shadow:0 18px 36px rgba(255,77,109,0.14);
    }
    .service-card:hover::before{
      opacity:1;
    }
    .service-icon{
      width:52px;height:52px;
      border-radius:14px;
      background:linear-gradient(135deg,var(--brand-light),#FFF0D6);
      display:flex;
      align-items:center;
      justify-content:center;
      font-weight:800;
      color:var(--brand-dark);
      font-size:1.2rem;
      margin-bottom:18px;
    }
    .service-card h3{
      font-size:1.08rem;
      margin-bottom:10px;
      color:var(--ink);
    }
    .service-card p{
      font-size:.9rem;
      color:var(--muted);
      line-height:1.7;
    }
    /* models strip */
    .model-marquee{
      background:var(--card);
      border:1px solid var(--border);
      border-radius:var(--radius);
      padding:18px 24px;
      display:flex;
      flex-wrap:wrap;
      gap:12px;
      justify-content:center;
      box-shadow:var(--shadow);
    }
    .model-chip{
      background:var(--bg-soft);
      padding:7px 16px;
      border-radius:24px;
      font-size:.85rem;
      font-weight:500;
      color:var(--ink-soft);
      border:1px solid var(--border);
      transition:all .2s;
    }
    .model-chip:hover{
      background:var(--brand);
      color:#fff;
      border-color:var(--brand);
      transform:translateY(-2px);
    }
    /* workflow */
    .workflow-steps{
      display:grid;
      grid-template-columns:repeat(4,1fr);
      gap:var(--gap);
      counter-reset:step;
    }
    .workflow-step{
      background:var(--card);
      border:1px solid var(--border);
      border-radius:var(--radius);
      padding:28px 22px;
      position:relative;
      counter-increment:step;
      transition:transform .25s,box-shadow .25s;
    }
    .workflow-step:hover{
      transform:translateY(-4px);
      box-shadow:var(--shadow);
    }
    .workflow-step::before{
      content:counter(step,decimal-leading-zero);
      font-size:2rem;
      font-weight:800;
      color:var(--brand-light);
      display:block;
      line-height:1;
      margin-bottom:14px;
      letter-spacing:-1px;
    }
    .workflow-step h3{
      font-size:1rem;
      margin-bottom:8px;
    }
    .workflow-step p{
      font-size:.86rem;
      color:var(--muted);
    }
    /* comparison */
    .comparison-wrap{
      overflow-x:auto;
      border-radius:var(--radius);
      border:1px solid var(--border);
      background:var(--card);
      box-shadow:var(--shadow);
    }
    .comparison-table{
      width:100%;
      border-collapse:collapse;
      min-width:760px;
      font-size:.92rem;
    }
    .comparison-table th{
      background:linear-gradient(135deg,var(--brand),var(--brand-dark));
      color:#fff;
      padding:16px 20px;
      text-align:left;
      font-weight:600;
      white-space:nowrap;
    }
    .comparison-table th:first-child{
      border-radius:var(--radius) 0 0 0;
    }
    .comparison-table th:last-child{
      border-radius:0 var(--radius) 0 0;
    }
    .comparison-table td{
      padding:14px 20px;
      border-bottom:1px solid var(--bg-soft);
      color:var(--ink-soft);
    }
    .comparison-table tr:last-child td{
      border-bottom:none;
    }
    .comparison-table tr:nth-child(even){
      background:#FFFAFB;
    }
    .rating-stars{
      color:var(--accent);
      letter-spacing:2px;
      font-size:1rem;
    }
    .score-badge{
      display:inline-flex;
      align-items:center;
      background:var(--brand-light);
      color:var(--brand-dark);
      font-weight:800;
      padding:4px 12px;
      border-radius:20px;
      font-size:.9rem;
    }
    /* reviews */
    .reviews-grid{
      display:grid;
      grid-template-columns:repeat(3,1fr);
      gap:var(--gap);
    }
    .review-card{
      background:var(--card);
      border:1px solid var(--border);
      border-radius:var(--radius);
      padding:26px;
      transition:transform .25s,box-shadow .25s;
      display:flex;
      flex-direction:column;
      gap:14px;
    }
    .review-card:hover{
      transform:translateY(-4px);
      box-shadow:var(--shadow);
    }
    .review-stars{
      color:var(--accent);
      font-size:.95rem;
      letter-spacing:2px;
    }
    .review-text{
      font-size:.92rem;
      color:var(--ink-soft);
      line-height:1.7;
      flex:1;
    }
    .review-user{
      display:flex;
      align-items:center;
      gap:12px;
      border-top:1px solid var(--bg-soft);
      padding-top:14px;
    }
    .avatar{
      width:40px;height:40px;
      border-radius:50%;
      background:linear-gradient(135deg,var(--brand-light),var(--accent-light));
      display:flex;
      align-items:center;
      justify-content:center;
      font-weight:700;
      color:var(--brand-dark);
      font-size:.9rem;
      flex-shrink:0;
    }
    .user-info strong{
      display:block;
      font-size:.88rem;
      color:var(--ink);
    }
    .user-info span{
      font-size:.78rem;
      color:var(--muted);
    }
    /* cases */
    .cases-grid{
      display:grid;
      grid-template-columns:repeat(2,1fr);
      gap:var(--gap);
    }
    .case-card{
      background:var(--card);
      border:1px solid var(--border);
      border-radius:var(--radius);
      overflow:hidden;
      transition:transform .28s,box-shadow .28s;
    }
    .case-card:hover{
      transform:translateY(-4px);
      box-shadow:var(--shadow);
    }
    .case-img-wrap{
      aspect-ratio:16/9;
      overflow:hidden;
      background:var(--bg-soft);
    }
    .case-img-wrap img{
      width:100%;
      height:100%;
      object-fit:cover;
      transition:transform .4s ease;
    }
    .case-card:hover .case-img-wrap img{
      transform:scale(1.04);
    }
    .case-body{
      padding:20px 22px;
    }
    .case-body h3{
      font-size:1.05rem;
      margin-bottom:8px;
    }
    .case-body p{
      font-size:.88rem;
      color:var(--muted);
      margin-bottom:12px;
    }
    .case-tags{
      display:flex;
      gap:8px;
      flex-wrap:wrap;
    }
    .case-tags span{
      font-size:.75rem;
      background:var(--bg-soft);
      padding:3px 10px;
      border-radius:14px;
      color:var(--ink-soft);
    }
    /* token table */
    .token-card{
      background:var(--card);
      border:1px solid var(--border);
      border-radius:var(--radius);
      overflow:hidden;
      box-shadow:var(--shadow);
    }
    .token-table{
      width:100%;
      border-collapse:collapse;
      font-size:.9rem;
    }
    .token-table th{
      background:var(--bg-soft);
      color:var(--ink);
      padding:14px 18px;
      text-align:left;
      font-weight:600;
    }
    .token-table td{
      padding:13px 18px;
      border-bottom:1px solid var(--bg-soft);
      color:var(--ink-soft);
    }
    .token-table tr:last-child td{
      border-bottom:none;
    }
    .price-low{
      color:var(--brand-dark);
      font-weight:700;
    }
    .price-original{
      text-decoration:line-through;
      color:var(--muted);
      font-size:.82rem;
      margin-left:4px;
    }
    /* articles */
    .articles-grid{
      display:grid;
      grid-template-columns:repeat(3,1fr);
      gap:var(--gap);
    }
    .article-card{
      background:var(--card);
      border:1px solid var(--border);
      border-radius:var(--radius);
      padding:22px;
      transition:transform .22s,box-shadow .22s;
      display:flex;
      flex-direction:column;
      gap:8px;
    }
    .article-card:hover{
      transform:translateY(-4px);
      box-shadow:var(--shadow);
    }
    .article-date{
      font-size:.78rem;
      color:var(--brand-dark);
      font-weight:600;
    }
    .article-card h3{
      font-size:1rem;
      line-height:1.4;
    }
    .article-card p{
      font-size:.85rem;
      color:var(--muted);
      flex:1;
    }
    .article-link{
      font-size:.85rem;
      font-weight:600;
      color:var(--brand-dark);
    }
    /* form */
    .contact-grid{
      display:grid;
      grid-template-columns:1fr 1.2fr;
      gap:40px;
      align-items:start;
    }
    .contact-info{
      background:var(--card);
      border:1px solid var(--border);
      border-radius:var(--radius);
      padding:32px;
      box-shadow:var(--shadow);
    }
    .contact-info h3{
      font-size:1.15rem;
      margin-bottom:20px;
    }
    .contact-item{
      display:flex;
      gap:12px;
      padding:12px 0;
      border-bottom:1px solid var(--bg-soft);
      font-size:.92rem;
      color:var(--ink-soft);
      align-items:flex-start;
    }
    .contact-item:last-child{
      border-bottom:none;
    }
    .contact-item strong{
      color:var(--ink);
      min-width:70px;
      flex-shrink:0;
    }
    .qr-box{
      margin-top:20px;
      text-align:center;
    }
    .qr-box img{
      width:140px;
      height:140px;
      object-fit:contain;
      border-radius:12px;
      border:1px solid var(--border);
      margin:0 auto;
    }
    .qr-box span{
      display:block;
      font-size:.8rem;
      color:var(--muted);
      margin-top:8px;
    }
    .form-card{
      background:var(--card);
      border:1px solid var(--border);
      border-radius:var(--radius);
      padding:32px;
      box-shadow:var(--shadow);
    }
    .form-card h3{
      font-size:1.15rem;
      margin-bottom:8px;
    }
    .form-card .form-sub{
      font-size:.88rem;
      color:var(--muted);
      margin-bottom:22px;
    }
    .form-row{
      display:grid;
      grid-template-columns:1fr 1fr;
      gap:16px;
    }
    .form-group{
      margin-bottom:16px;
    }
    .form-group label{
      display:block;
      font-size:.85rem;
      font-weight:600;
      margin-bottom:6px;
      color:var(--ink-soft);
    }
    .form-group input,
    .form-group select,
    .form-group textarea{
      width:100%;
      padding:11px 14px;
      border:1px solid var(--border);
      border-radius:var(--radius-sm);
      font-size:.92rem;
      font-family:inherit;
      background:var(--bg);
      color:var(--ink);
      transition:border .2s,box-shadow .2s;
      outline:none;
    }
    .form-group input:focus,
    .form-group select:focus,
    .form-group textarea:focus{
      border-color:var(--brand);
      box-shadow:0 0 0 3px rgba(255,77,109,0.15);
    }
    .form-group textarea{
      resize:vertical;
      min-height:100px;
    }
    .form-submit{
      width:100%;
      margin-top:6px;
    }
    /* faq */
    .faq-list{
      display:flex;
      flex-direction:column;
      gap:12px;
      max-width:860px;
      margin:0 auto;
    }
    .faq-item{
      background:var(--card);
      border:1px solid var(--border);
      border-radius:var(--radius-sm);
      overflow:hidden;
      transition:box-shadow .22s;
    }
    .faq-item:hover{
      box-shadow:0 6px 16px rgba(255,77,109,0.08);
    }
    .faq-question{
      width:100%;
      text-align:left;
      background:none;
      border:none;
      padding:18px 22px;
      font-size:.98rem;
      font-weight:600;
      color:var(--ink);
      cursor:pointer;
      display:flex;
      justify-content:space-between;
      align-items:center;
      gap:14px;
      font-family:inherit;
      transition:background .2s;
    }
    .faq-question:hover{
      background:var(--bg);
    }
    .faq-icon{
      width:24px;height:24px;
      border-radius:50%;
      background:var(--brand-light);
      color:var(--brand-dark);
      display:flex;
      align-items:center;
      justify-content:center;
      font-size:1rem;
      flex-shrink:0;
      transition:transform .3s,background .3s;
    }
    .faq-item.active .faq-icon{
      transform:rotate(45deg);
      background:var(--brand);
      color:#fff;
    }
    .faq-answer{
      max-height:0;
      overflow:hidden;
      transition:max-height .35s ease,padding .35s ease;
      padding:0 22px;
      font-size:.9rem;
      color:var(--muted);
      line-height:1.7;
    }
    .faq-item.active .faq-answer{
      padding:0 22px 20px;
    }
    /* footer */
    .site-footer{
      background:#2A1A1E;
      color:#FFE5EB;
      padding:56px 0 28px;
      margin-top:20px;
    }
    .footer-grid{
      display:grid;
      grid-template-columns:1.6fr 1fr 1fr 1.2fr;
      gap:36px;
      padding-bottom:36px;
      border-bottom:1px solid rgba(255,255,255,0.1);
    }
    .footer-brand img{
      max-height:40px;
      margin-bottom:14px;
      filter:brightness(0) invert(1);
    }
    .footer-brand p{
      font-size:.85rem;
      color:#FFB3C1;
      line-height:1.7;
      margin-bottom:16px;
    }
    .footer-brand .footer-links{
      display:flex;
      gap:16px;
    }
    .footer-brand .footer-links a{
      color:#FFE5EB;
      font-size:.85rem;
    }
    .footer-col h4{
      color:#fff;
      font-size:.95rem;
      margin-bottom:16px;
      font-weight:600;
    }
    .footer-col ul{
      list-style:none;
    }
    .footer-col li{
      margin-bottom:10px;
    }
    .footer-col a{
      color:#FFB3C1;
      font-size:.85rem;
      transition:color .2s;
    }
    .footer-col a:hover{
      color:#fff;
    }
    .footer-bottom{
      padding-top:24px;
      display:flex;
      justify-content:space-between;
      align-items:center;
      gap:16px;
      flex-wrap:wrap;
      font-size:.8rem;
      color:#D4A0A8;
    }
    .footer-bottom a{
      color:#FFB3C1;
    }
    /* float */
    .float-group{
      position:fixed;
      right:20px;
      bottom:28px;
      z-index:100;
      display:flex;
      flex-direction:column;
      gap:10px;
    }
    .float-btn{
      width:48px;height:48px;
      border-radius:50%;
      background:var(--card);
      border:1px solid var(--border);
      box-shadow:0 8px 20px rgba(0,0,0,0.1);
      display:flex;
      align-items:center;
      justify-content:center;
      cursor:pointer;
      transition:all .22s;
      font-size:1.1rem;
      color:var(--brand-dark);
      text-decoration:none;
    }
    .float-btn:hover{
      background:var(--brand);
      color:#fff;
      transform:translateY(-3px);
      box-shadow:0 12px 24px rgba(255,77,109,0.3);
    }
    .back-top{
      opacity:0;
      visibility:hidden;
    }
    .back-top.show{
      opacity:1;
      visibility:visible;
    }
    .kefu-pop{
      position:fixed;
      right:80px;
      bottom:80px;
      background:var(--card);
      border-radius:var(--radius);
      padding:16px;
      box-shadow:0 16px 40px rgba(0,0,0,0.15);
      border:1px solid var(--border);
      z-index:101;
      display:none;
    }
    .kefu-pop.show{
      display:block;
      animation:fadeUp .25s ease;
    }
    .kefu-pop img{
      width:160px;
      height:160px;
      object-fit:contain;
      border-radius:8px;
    }
    .kefu-pop .kefu-tip{
      text-align:center;
      font-size:.82rem;
      color:var(--muted);
      margin-top:8px;
    }
    @keyframes fadeUp{
      from{opacity:0;transform:translateY(10px);}
      to{opacity:1;transform:translateY(0);}
    }
    /* responsive */
    @media(max-width:1024px){
      .hero-content{
        grid-template-columns:1fr;
        gap:36px;
      }
      .hero-visual{
        max-width:520px;
        margin:0 auto;
      }
      .services-grid{
        grid-template-columns:repeat(2,1fr);
      }
      .workflow-steps{
        grid-template-columns:repeat(2,1fr);
      }
      .reviews-grid{
        grid-template-columns:repeat(2,1fr);
      }
      .footer-grid{
        grid-template-columns:1fr 1fr;
      }
      .contact-grid{
        grid-template-columns:1fr;
      }
    }
    @media(max-width:860px){
      .nav-links{
        display:none;
        position:absolute;
        top:100%;
        left:0;
        right:0;
        background:var(--bg);
        flex-direction:column;
        align-items:stretch;
        padding:12px 24px 20px;
        border-bottom:1px solid var(--border);
        box-shadow:0 16px 24px rgba(0,0,0,0.06);
        gap:0;
      }
      .nav-links.open{
        display:flex;
      }
      .nav-links a{
        padding:12px 0;
        border-bottom:1px solid var(--bg-soft);
        border-radius:0;
        text-align:left;
      }
      .menu-toggle{
        display:block;
      }
      .header-cta .btn{
        display:none;
      }
      .site-header{
        position:sticky;
      }
      .header-inner{
        position:relative;
      }
      .about-grid{
        grid-template-columns:1fr;
      }
      .cases-grid{
        grid-template-columns:1fr;
      }
      .articles-grid{
        grid-template-columns:1fr 1fr;
      }
      .form-row{
        grid-template-columns:1fr;
      }
    }
    @media(max-width:600px){
      .container{
        padding:0 16px;
      }
      .hero{
        padding:48px 0 40px;
      }
      .hero-actions{
        flex-direction:column;
        align-items:stretch;
      }
      .hero-actions .btn{
        width:100%;
      }
      .hero-stats{
        gap:24px;
      }
      .services-grid{
        grid-template-columns:1fr;
      }
      .workflow-steps{
        grid-template-columns:1fr;
      }
      .reviews-grid{
        grid-template-columns:1fr;
      }
      .articles-grid{
        grid-template-columns:1fr;
      }
      .footer-grid{
        grid-template-columns:1fr;
        gap:28px;
      }
      .footer-bottom{
        flex-direction:column;
        text-align:center;
      }
      .float-group{
        right:14px;
        bottom:20px;
      }
      .kefu-pop{
        right:14px;
        bottom:80px;
      }
      .kefu-pop img{
        width:140px;
        height:140px;
      }
    }