:root{
    --teal-950:#062e2b;
    --teal-900:#0a3d38;
    --teal-700:#0f766e;
    --teal-500:#14b8a6;
    --teal-400:#2dd4bf;
    --teal-100:#ccfbf1;
    --teal-50:#f0fdfa;
    --ink:#0f1f1d;
    --ink-soft:#3d4f4c;
    --line:#d7e8e4;
    --white:#ffffff;
    --bg:#f4fbf9;
    --shadow:0 10px 30px rgba(6,46,43,.08);
    --shadow-lg:0 20px 50px rgba(6,46,43,.12);
    --radius:18px;
    --container:1180px;
  }
  *{box-sizing:border-box;margin:0;padding:0}
  html{scroll-behavior:smooth}
  body{
    font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
    color:var(--ink);
    background:
      radial-gradient(1200px 600px at 15% -10%, rgba(45,212,191,.18), transparent 60%),
      radial-gradient(900px 500px at 100% 0%, rgba(20,184,166,.12), transparent 55%),
      linear-gradient(180deg,#f4fbf9 0%,#eef9f6 40%,#f7fdfc 100%);
    line-height:1.6;
    -webkit-font-smoothing:antialiased;
  }
  a{color:inherit;text-decoration:none}
  img{max-width:100%;height:auto;display:block}
  ul{list-style:none}
  .container{width:100%;max-width:var(--container);margin:0 auto;padding:0 20px}
  section{position:relative}
  .section-pad{padding:64px 0}
  .eyebrow{
    display:inline-flex;align-items:center;gap:8px;
    font-size:13px;font-weight:700;letter-spacing:.12em;
    color:var(--teal-700);text-transform:uppercase;
    background:rgba(20,184,166,.1);
    border:1px solid rgba(20,184,166,.25);
    padding:6px 14px;border-radius:999px;
  }
  .eyebrow::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--teal-500)}
  h1,h2,h3{line-height:1.25;letter-spacing:-.01em}
  h1{font-size:clamp(28px,4.4vw,48px);font-weight:800;color:var(--teal-950)}
  h2{font-size:clamp(24px,3vw,34px);font-weight:800;color:var(--teal-900)}
  h3{font-size:18px;font-weight:700;color:var(--teal-900)}
  .section-head{max-width:760px;margin-bottom:36px}
  .section-head h2{margin:12px 0 10px}
  .section-head p{color:var(--ink-soft);font-size:15.5px}
  .btn{
    display:inline-flex;align-items:center;justify-content:center;gap:8px;
    padding:13px 24px;border-radius:12px;font-size:15px;font-weight:700;
    border:1px solid transparent;cursor:pointer;transition:.25s ease;
    white-space:nowrap;
  }
  .btn-primary{
    background:linear-gradient(135deg,#0f766e,#14b8a6);
    color:#fff;box-shadow:0 8px 22px rgba(20,184,166,.35);
  }
  .btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 28px rgba(20,184,166,.42)}
  .btn-ghost{
    background:rgba(255,255,255,.72);color:var(--teal-900);
    border-color:var(--line);backdrop-filter:blur(6px);
  }
  .btn-ghost:hover{background:#fff;border-color:var(--teal-400);transform:translateY(-2px)}
  .btn:active{transform:translateY(0) scale(.98)}

  /* Header */
  .site-header{
    position:sticky;top:0;z-index:50;
    background:rgba(244,251,249,.86);
    backdrop-filter:blur(14px);
    border-bottom:1px solid rgba(15,118,110,.1);
  }
  .nav-wrap{
    display:flex;align-items:center;justify-content:space-between;
    gap:16px;min-height:70px;
  }
  .brand{display:flex;align-items:center;gap:10px;flex-shrink:0}
  .brand .ai-page-logo{width:42px;height:42px;object-fit:contain;border-radius:10px;background:#fff;padding:4px;box-shadow:var(--shadow)}
  .brand-text{display:flex;flex-direction:column;line-height:1.15}
  .brand-text strong{font-size:17px;color:var(--teal-950);letter-spacing:.02em}
  .brand-text span{font-size:11px;color:var(--teal-700);letter-spacing:.14em}
  .nav-links{
    display:flex;align-items:center;gap:0;flex-wrap:wrap;justify-content:flex-end;
  }
  .nav-links a{
    font-size:14px;font-weight:600;color:var(--ink-soft);
    padding:8px 13px;border-radius:9px;transition:.2s;
  }
  .nav-links a:hover{color:var(--teal-700);background:rgba(20,184,166,.1)}
  .nav-cta{display:flex;align-items:center;gap:10px;flex-shrink:0}
  .nav-toggle{
    display:none;width:42px;height:42px;border-radius:11px;
    border:1px solid var(--line);background:#fff;cursor:pointer;
    align-items:center;justify-content:center;flex-direction:column;gap:4px;
  }
  .nav-toggle span{display:block;width:18px;height:2px;background:var(--teal-900);border-radius:2px;transition:.25s}
  .nav-toggle.active span:nth-child(1){transform:translateY(6px) rotate(45deg)}
  .nav-toggle.active span:nth-child(2){opacity:0}
  .nav-toggle.active span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
  .mobile-panel{
    display:none;flex-direction:column;gap:4px;
    padding:12px 0 18px;border-top:1px dashed rgba(15,118,110,.18);
  }
  .mobile-panel a{
    padding:11px 14px;border-radius:10px;font-weight:600;font-size:14.5px;color:var(--ink-soft);
  }
  .mobile-panel a:hover{background:rgba(20,184,166,.1);color:var(--teal-700)}
  .mobile-panel.open{display:flex}

  /* Hero */
  .hero{padding:56px 0 60px;overflow:hidden}
  .hero::before{
    content:"";position:absolute;inset:0;z-index:-1;
    background:
      radial-gradient(520px 320px at 78% 18%,rgba(45,212,191,.22),transparent 65%),
      radial-gradient(420px 280px at 8% 84%,rgba(20,184,166,.14),transparent 60%);
  }
  .hero-grid{
    display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center;
  }
  .hero h1{margin:16px 0 18px}
  .hero h1 em{
    font-style:normal;
    background:linear-gradient(120deg,#0f766e,#2dd4bf);
    -webkit-background-clip:text;background-clip:text;color:transparent;
  }
  .hero-lead{font-size:16.5px;color:var(--ink-soft);max-width:560px;margin-bottom:26px}
  .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:26px}
  .hero-badges{display:flex;flex-wrap:wrap;gap:9px}
  .hero-badges span{
    font-size:12.5px;font-weight:600;color:var(--teal-900);
    background:rgba(255,255,255,.8);border:1px solid var(--line);
    padding:6px 12px;border-radius:999px;
  }
  /* Hero visual: no images, pure CSS */
  .hero-visual{
    position:relative;min-height:360px;border-radius:26px;
    background:
      linear-gradient(145deg,rgba(255,255,255,.95),rgba(236,253,249,.92));
    border:1px solid rgba(20,184,166,.28);
    box-shadow:var(--shadow-lg);
    padding:24px;display:flex;flex-direction:column;gap:14px;
    overflow:hidden;
  }
  .hero-visual::after{
    content:"";position:absolute;width:260px;height:260px;border-radius:50%;
    right:-80px;bottom:-90px;
    background:radial-gradient(circle,rgba(45,212,191,.35),transparent 70%);
    animation:floatGlow 8s ease-in-out infinite alternate;
  }
  @keyframes floatGlow{from{transform:translate(0,0)}to{transform:translate(-20px,-16px)}}
  .hv-top{display:flex;align-items:center;justify-content:space-between;gap:10px}
  .hv-top strong{font-size:14px;color:var(--teal-900)}
  .hv-dot{display:flex;gap:5px}
  .hv-dot i{width:8px;height:8px;border-radius:50%;background:rgba(20,184,166,.45)}
  .hv-dot i:first-child{background:var(--teal-500)}
  .hv-models{display:grid;grid-template-columns:1fr 1fr;gap:10px}
  .hv-model{
    background:#fff;border:1px solid var(--line);border-radius:13px;
    padding:11px 13px;display:flex;align-items:center;gap:9px;
    transition:.25s;
  }
  .hv-model:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:var(--teal-400)}
  .hv-model i{
    width:28px;height:28px;border-radius:9px;flex-shrink:0;
    background:linear-gradient(135deg,#ccfbf1,#5eead4);
    display:flex;align-items:center;justify-content:center;
    font-style:normal;font-size:12px;font-weight:800;color:var(--teal-900);
  }
  .hv-model b{font-size:12.5px;color:var(--teal-900);line-height:1.2}
  .hv-bars{margin-top:auto;display:flex;flex-direction:column;gap:9px}
  .hv-bar{display:flex;flex-direction:column;gap:5px}
  .hv-bar header{display:flex;justify-content:space-between;font-size:11.5px;font-weight:700;color:var(--ink-soft)}
  .hv-bar .track{height:7px;background:#e3f4ef;border-radius:99px;overflow:hidden}
  .hv-bar .track span{display:block;height:100%;border-radius:99px;background:linear-gradient(90deg,#0f766e,#2dd4bf);width:0;animation:barGrow 1.6s ease forwards}
  @keyframes barGrow{to{width:var(--w)}}
  .hero-note{
    font-size:12.5px;color:var(--teal-700);font-weight:600;
    display:flex;align-items:center;gap:7px;justify-content:center;margin-top:22px;
  }
  .hero-note::before{content:"";width:18px;height:2px;background:var(--teal-400);border-radius:2px}

  /* Stats */
  .stats-band{
    background:linear-gradient(135deg,#0a3d38,#0f766e);
    border-radius:24px;padding:34px 28px;color:#fff;
    box-shadow:0 22px 48px rgba(6,46,43,.22);
    display:grid;grid-template-columns:repeat(4,1fr);gap:22px;
  }
  .stat-item{display:flex;flex-direction:column;gap:6px;position:relative}
  .stat-item:not(:last-child)::after{
    content:"";position:absolute;right:-11px;top:6px;bottom:6px;width:1px;
    background:rgba(255,255,255,.16);
  }
  .stat-item b{font-size:clamp(22px,2.6vw,30px);font-weight:800;letter-spacing:-.01em}
  .stat-item span{font-size:13px;color:rgba(255,255,255,.8);font-weight:500}

  /* Generic card grids */
  .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
  .grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
  .card{
    background:#fff;border:1px solid var(--line);border-radius:var(--radius);
    padding:24px;transition:.28s ease;box-shadow:0 2px 8px rgba(6,46,43,.04);
  }
  .card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:rgba(20,184,166,.45)}
  .card-icon{
    width:46px;height:46px;border-radius:13px;display:flex;align-items:center;justify-content:center;
    background:linear-gradient(135deg,#ccfbf1,#5eead4);color:var(--teal-900);
    font-weight:800;font-size:17px;margin-bottom:16px;
  }
  .card h3{margin-bottom:8px}
  .card p{font-size:14.5px;color:var(--ink-soft)}
  .card ul{margin-top:12px;display:flex;flex-direction:column;gap:7px}
  .card ul li{font-size:13.5px;color:var(--ink-soft);padding-left:18px;position:relative}
  .card ul li::before{content:"";position:absolute;left:0;top:8px;width:7px;height:7px;border-radius:2px;background:var(--teal-400)}

  /* Tag cloud */
  .tag-cloud{display:flex;flex-wrap:wrap;gap:9px;margin-top:20px}
  .tag-cloud span{
    font-size:13px;font-weight:600;color:var(--teal-900);
    background:rgba(255,255,255,.85);border:1px solid var(--line);
    padding:6px 13px;border-radius:999px;transition:.2s;
  }
  .tag-cloud span:hover{background:var(--teal-50);border-color:var(--teal-400);transform:translateY(-2px)}

  /* Flow */
  .flow{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;counter-reset:step}
  .flow-item{
    background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px;
    position:relative;transition:.25s;
  }
  .flow-item:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
  .flow-item::before{
    counter-increment:step;content:"0" counter(step);
    font-size:26px;font-weight:800;color:rgba(20,184,166,.22);
    display:block;margin-bottom:10px;letter-spacing:-.02em;
  }
  .flow-item h3{font-size:16px;margin-bottom:7px}
  .flow-item p{font-size:13.5px;color:var(--ink-soft)}

  /* Table */
  .table-scroll{overflow-x:auto;border-radius:16px;border:1px solid var(--line);background:#fff;box-shadow:var(--shadow)}
  table{width:100%;border-collapse:collapse;min-width:680px;font-size:14.5px}
  thead th{
    background:linear-gradient(135deg,#0a3d38,#0f766e);color:#fff;
    text-align:left;padding:15px 18px;font-weight:700;font-size:14px;white-space:nowrap;
  }
  tbody td{padding:14px 18px;border-top:1px solid var(--line);color:var(--ink-soft);vertical-align:top}
  tbody tr:nth-child(even){background:#f8fdfb}
  tbody td strong{color:var(--teal-900)}
  .rating-stars{color:#f59e0b;letter-spacing:2px;font-size:15px;white-space:nowrap}

  /* Review / testimonials */
  .review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
  .review{
    background:#fff;border:1px solid var(--line);border-radius:var(--radius);
    padding:24px;display:flex;flex-direction:column;gap:14px;transition:.25s;
  }
  .review:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
  .review header{display:flex;align-items:center;gap:12px}
  .avatar{
    width:44px;height:44px;border-radius:50%;flex-shrink:0;
    background:linear-gradient(135deg,#14b8a6,#5eead4);color:#fff;
    display:flex;align-items:center;justify-content:center;font-weight:800;font-size:15px;
  }
  .review header b{display:block;font-size:14.5px;color:var(--teal-950)}
  .review header span{font-size:12.5px;color:var(--ink-soft)}
  .review p{font-size:14px;color:var(--ink-soft);flex:1}
  .review .stars{color:#f59e0b;font-size:14px;letter-spacing:1px}

  /* Case & articles split */
  .split{display:grid;grid-template-columns:1.1fr .9fr;gap:24px;align-items:start}
  .case-list{display:flex;flex-direction:column;gap:14px}
  .case-item{
    display:flex;gap:14px;align-items:flex-start;background:#fff;border:1px solid var(--line);
    border-radius:14px;padding:18px;transition:.25s;
  }
  .case-item:hover{border-color:var(--teal-400);transform:translateX(4px);box-shadow:var(--shadow)}
  .case-tag{
    flex-shrink:0;font-size:12px;font-weight:700;color:var(--teal-900);
    background:var(--teal-50);border:1px solid rgba(20,184,166,.3);
    padding:4px 10px;border-radius:7px;white-space:nowrap;
  }
  .case-item div b{display:block;font-size:14.5px;color:var(--teal-950);margin-bottom:3px}
  .case-item div p{font-size:13.5px;color:var(--ink-soft)}
  .article-list{display:flex;flex-direction:column;gap:2px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
  .article-list a{
    display:flex;align-items:center;gap:12px;padding:15px 18px;font-size:14px;font-weight:600;
    color:var(--ink-soft);border-bottom:1px solid var(--line);transition:.2s;
  }
  .article-list a:last-child{border-bottom:none}
  .article-list a:hover{background:var(--teal-50);color:var(--teal-700);padding-left:22px}
  .article-list a::before{
    content:"";width:7px;height:7px;border-radius:2px;background:var(--teal-400);flex-shrink:0;
  }

  /* FAQ */
  .faq-list{display:flex;flex-direction:column;gap:12px;max-width:900px}
  .faq-item{border:1px solid var(--line);border-radius:14px;background:#fff;overflow:hidden;transition:.25s}
  .faq-item.open{border-color:var(--teal-400);box-shadow:var(--shadow)}
  .faq-q{
    width:100%;text-align:left;background:none;border:none;cursor:pointer;
    padding:17px 20px;font-size:15px;font-weight:700;color:var(--teal-950);
    display:flex;justify-content:space-between;align-items:center;gap:14px;
  }
  .faq-q i{
    flex-shrink:0;width:24px;height:24px;border-radius:50%;
    background:var(--teal-50);color:var(--teal-700);font-style:normal;font-weight:700;
    display:flex;align-items:center;justify-content:center;font-size:15px;transition:.25s;
  }
  .faq-item.open .faq-q i{transform:rotate(45deg);background:var(--teal-500);color:#fff}
  .faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease}
  .faq-a p{padding:0 20px 18px;font-size:14px;color:var(--ink-soft)}

  /* Form */
  .contact-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:26px;align-items:start}
  .form-card{
    background:#fff;border:1px solid var(--line);border-radius:22px;
    padding:28px;box-shadow:var(--shadow);
  }
  .form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:14px}
  .field{display:flex;flex-direction:column;gap:6px}
  .field.full{grid-column:1 / -1}
  .field label{font-size:13px;font-weight:700;color:var(--teal-900)}
  .field input,.field select,.field textarea{
    width:100%;padding:11px 14px;border:1px solid var(--line);border-radius:10px;
    font-size:14px;color:var(--ink);background:#fbfefd;font-family:inherit;
    transition:.2s;
  }
  .field input:focus,.field select:focus,.field textarea:focus{
    outline:none;border-color:var(--teal-400);background:#fff;box-shadow:0 0 0 3px rgba(20,184,166,.15);
  }
  .field textarea{resize:vertical;min-height:96px}
  .form-card .btn{width:100%;margin-top:6px}
  .contact-side{display:flex;flex-direction:column;gap:16px}
  .contact-box{
    background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px;
    display:flex;gap:16px;align-items:flex-start;
  }
  .contact-box .qr{
    width:92px;height:92px;flex-shrink:0;border-radius:10px;border:1px solid var(--line);
    object-fit:contain;background:#fff;
  }
  .contact-box div b{display:block;font-size:14.5px;color:var(--teal-950);margin-bottom:5px}
  .contact-box div p{font-size:13.5px;color:var(--ink-soft);word-break:break-all}
  .contact-box div p + p{margin-top:3px}

  /* Footer */
  .site-footer{
    margin-top:20px;
    background:linear-gradient(160deg,#0a3d38,#062e2b);
    color:#d8f3ee;padding:52px 0 24px;
  }
  .footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:34px;margin-bottom:36px}
  .footer-brand{display:flex;flex-direction:column;gap:14px}
  .footer-brand .brand .ai-page-logo{background:rgba(255,255,255,.1);box-shadow:none}
  .footer-brand p{font-size:13.5px;color:rgba(216,243,238,.75);line-height:1.75}
  .footer-col h4{font-size:14px;color:#fff;margin-bottom:14px;font-weight:700;letter-spacing:.03em}
  .footer-col ul{display:flex;flex-direction:column;gap:9px}
  .footer-col ul li a{font-size:13.5px;color:rgba(216,243,238,.78);transition:.2s}
  .footer-col ul li a:hover{color:#5eead4;padding-left:3px}
  .footer-contact{display:flex;flex-direction:column;gap:8px;font-size:13.5px;color:rgba(216,243,238,.78)}
  .footer-contact b{color:#fff;font-weight:600}
  .footer-bottom{
    border-top:1px solid rgba(216,243,238,.16);padding-top:20px;
    display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;
    font-size:12.5px;color:rgba(216,243,238,.6);
  }
  .friend-links{display:flex;flex-wrap:wrap;gap:8px 16px;font-size:12.5px}
  .friend-links a{color:rgba(216,243,238,.7);transition:.2s}
  .friend-links a:hover{color:#5eead4}

  /* Floating */
  .back-top{
    position:fixed;right:18px;bottom:88px;width:44px;height:44px;border-radius:50%;
    background:#fff;border:1px solid var(--line);color:var(--teal-700);
    display:flex;align-items:center;justify-content:center;cursor:pointer;
    box-shadow:var(--shadow);z-index:60;opacity:0;pointer-events:none;transition:.25s;
    font-size:18px;font-weight:800;
  }
  .back-top.show{opacity:1;pointer-events:auto}
  .back-top:hover{transform:translateY(-3px);border-color:var(--teal-400)}
  .float-cs{
    position:fixed;right:18px;bottom:22px;z-index:60;
    display:flex;flex-direction:column;align-items:flex-end;gap:10px;
  }
  .float-cs-btn{
    width:54px;height:54px;border-radius:50%;
    background:linear-gradient(135deg,#0f766e,#2dd4bf);color:#fff;
    display:flex;align-items:center;justify-content:center;cursor:pointer;
    border:none;box-shadow:0 12px 28px rgba(20,184,166,.42);
    font-size:13px;font-weight:700;letter-spacing:.04em;transition:.25s;
    animation:pulseBtn 3s ease-in-out infinite;
  }
  .float-cs-btn:hover{transform:scale(1.06)}
  @keyframes pulseBtn{
    0%,100%{box-shadow:0 12px 28px rgba(20,184,166,.42)}
    50%{box-shadow:0 12px 32px rgba(20,184,166,.62)}
  }
  .float-cs-panel{
    display:none;background:#fff;border:1px solid var(--line);border-radius:16px;
    padding:16px;width:230px;box-shadow:var(--shadow-lg);text-align:center;
  }
  .float-cs-panel.open{display:block;animation:fadeUp .25s ease}
  .float-cs-panel img{width:130px;height:130px;object-fit:contain;margin:0 auto 10px;border-radius:8px;border:1px solid var(--line)}
  .float-cs-panel b{display:block;font-size:13.5px;color:var(--teal-950);margin-bottom:4px}
  .float-cs-panel p{font-size:12.5px;color:var(--ink-soft)}
  @keyframes fadeUp{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}

  /* Reveal */
  .reveal{opacity:0;transform:translateY(22px);transition:opacity .6s ease,transform .6s ease}
  .reveal.in{opacity:1;transform:translateY(0)}

  /* Responsive */
  @media (max-width:1024px){
    .hero-grid{grid-template-columns:1fr;gap:32px}
    .hero-visual{min-height:320px}
    .stats-band{grid-template-columns:repeat(2,1fr)}
    .stat-item:nth-child(2)::after{display:none}
    .grid-3{grid-template-columns:repeat(2,1fr)}
    .review-grid{grid-template-columns:repeat(2,1fr)}
    .split{grid-template-columns:1fr}
    .contact-grid{grid-template-columns:1fr}
    .flow{grid-template-columns:repeat(2,1fr)}
    .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
  }
  @media (max-width:820px){
    .nav-links{display:none}
    .nav-toggle{display:flex}
    .nav-cta .btn-ghost{display:none}
  }
  @media (max-width:640px){
    .section-pad{padding:48px 0}
    .hero{padding:36px 0 46px}
    .stats-band{padding:26px 20px;gap:18px}
    .grid-3,.grid-2,.review-grid,.flow{grid-template-columns:1fr}
    .form-row{grid-template-columns:1fr}
    .footer-grid{grid-template-columns:1fr;gap:26px}
    .footer-bottom{flex-direction:column;align-items:flex-start}
    .nav-wrap{min-height:62px}
    .brand .ai-page-logo{width:36px;height:36px}
    .hero-actions .btn{flex:1 1 auto}
    .float-cs-panel{width:210px}
  }