:root{
    --ink:#0d2b2e;
    --ink2:#31575a;
    --muted:#5d7c7f;
    --teal:#0d9488;
    --teal-d:#0b7a71;
    --cyan:#12b8c9;
    --bg:#f2fbfa;
    --card:#ffffff;
    --line:rgba(13,148,136,.16);
    --radius:16px;
    --shadow:0 12px 30px rgba(11,90,84,.08);
  }
  *{box-sizing:border-box}
  html{scroll-behavior:smooth}
  body{
    margin:0;
    color:var(--ink);
    font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Helvetica Neue",Arial,sans-serif;
    font-size:16px;
    line-height:1.75;
    background:
      radial-gradient(1000px 620px at 88% -8%, rgba(34,211,238,.18), transparent 62%),
      radial-gradient(880px 520px at 0% 6%, rgba(13,148,136,.13), transparent 60%),
      linear-gradient(180deg,#f4fcfb 0%,#eef9f8 42%,#f7fdfc 100%);
    background-attachment:fixed;
    -webkit-font-smoothing:antialiased;
  }
  img{max-width:100%}
  a{color:var(--teal-d)}
  .container{width:100%;max-width:1180px;margin:0 auto;padding:0 20px}
  section{padding:58px 0}
  .section-head{max-width:760px;margin-bottom:28px}
  .eyebrow{
    display:inline-block;margin:0 0 10px;padding:5px 12px;border-radius:999px;
    font-size:13px;font-weight:600;letter-spacing:.04em;
    color:#0b6f68;background:rgba(13,148,136,.1);border:1px solid var(--line);
  }
  h1,h2,h3{line-height:1.3;margin:0 0 12px;color:var(--ink)}
  h1{font-size:clamp(1.7rem,4.4vw,2.6rem);letter-spacing:-.01em}
  h2{font-size:clamp(1.35rem,2.9vw,1.9rem)}
  h3{font-size:1.06rem}
  p{margin:0 0 14px;color:var(--ink2)}
  .lead{color:var(--muted);font-size:1.02rem}
  .muted{color:var(--muted)}

  .btn{
    display:inline-flex;align-items:center;justify-content:center;gap:8px;
    padding:12px 24px;border-radius:999px;font-size:15px;font-weight:600;
    text-decoration:none;border:1px solid transparent;cursor:pointer;
    transition:transform .22s ease,box-shadow .22s ease,background .22s ease,border-color .22s ease;
  }
  .btn-primary{
    background:linear-gradient(135deg,#0d9488,#0f9bb8);color:#fff;
    box-shadow:0 10px 22px rgba(13,148,136,.28);
  }
  .btn-primary:hover{transform:translateY(-2px);box-shadow:0 15px 30px rgba(13,148,136,.34)}
  .btn-primary:active{transform:translateY(0)}
  .btn-ghost{background:#fff;color:#0b6f68;border-color:rgba(13,148,136,.38)}
  .btn-ghost:hover{background:#effbf9;transform:translateY(-2px);box-shadow:0 10px 20px rgba(11,90,84,.1)}
  .btn-sm{padding:9px 16px;font-size:14px}

  /* header */
  .site-header{
    position:sticky;top:0;z-index:60;
    background:rgba(255,255,255,.9);
    border-bottom:1px solid var(--line);
    backdrop-filter:blur(10px);
  }
  .nav-inner{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;padding:12px 20px}
  .brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink)}
  .ai-page-logo{max-height:38px;width:auto;display:block}
  .brand-text{font-weight:700;font-size:1rem;line-height:1.25}
  .brand-text em{display:block;font-style:normal;font-size:11px;font-weight:500;color:var(--muted);letter-spacing:.06em}
  .nav-wrap{display:flex;align-items:center}
  .nav-links{display:flex;align-items:center;gap:0;list-style:none;margin:0;padding:0}
  .nav-links a{
    display:block;padding:9px 11px;border-radius:10px;
    font-size:14.5px;color:var(--ink2);text-decoration:none;white-space:nowrap;
    transition:background .2s ease,color .2s ease;
  }
  .nav-links a:hover{background:rgba(13,148,136,.1);color:#0b6f68}
  .nav-toggle{
    display:none;padding:8px 14px;border-radius:10px;font-size:14px;font-weight:600;
    color:#0b6f68;background:#fff;border:1px solid rgba(13,148,136,.32);cursor:pointer;
  }
  .nav-cta{flex-shrink:0}

  /* hero */
  .hero{padding-top:44px;padding-bottom:46px;position:relative;overflow:hidden}
  .hero::before{
    content:"";position:absolute;inset:0;pointer-events:none;
    background-image:
      linear-gradient(to right,rgba(13,148,136,.07) 1px,transparent 1px),
      linear-gradient(to bottom,rgba(13,148,136,.07) 1px,transparent 1px);
    background-size:64px 64px;
    mask-image:radial-gradient(70% 60% at 50% 30%,#000 0%,transparent 78%);
    -webkit-mask-image:radial-gradient(70% 60% at 50% 30%,#000 0%,transparent 78%);
  }
  .hero-grid{
    position:relative;
    display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);
    gap:40px;align-items:center;
  }
  .hero-copy .eyebrow{margin-bottom:14px}
  .hero-copy h1{margin-bottom:14px}
  .hero-sub{font-size:1.02rem;color:var(--ink2);max-width:36em}
  .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:24px 0 18px}
  .hero-notes{display:flex;flex-wrap:wrap;gap:8px 18px;list-style:none;margin:0;padding:0;font-size:14px;color:var(--muted)}
  .hero-notes li{position:relative;padding-left:16px}
  .hero-notes li::before{
    content:"";position:absolute;left:0;top:.62em;width:7px;height:7px;border-radius:50%;
    background:linear-gradient(135deg,#0d9488,#22d3ee);
  }
  .hero-panel{
    background:linear-gradient(160deg,rgba(255,255,255,.96),rgba(233,250,249,.92));
    border:1px solid var(--line);border-radius:22px;padding:22px;
    box-shadow:0 18px 40px rgba(11,90,84,.1);
    animation:floaty 7s ease-in-out infinite;
  }
  .panel-head{display:flex;align-items:center;gap:9px;font-weight:700;font-size:.95rem;color:#0b6f68;margin-bottom:16px}
  .panel-dot{width:9px;height:9px;border-radius:50%;background:linear-gradient(135deg,#0d9488,#22d3ee);box-shadow:0 0 0 4px rgba(13,148,136,.14)}
  .panel-flow{display:grid;gap:8px;margin-bottom:16px}
  .flow-step{
    display:flex;align-items:center;gap:10px;
    padding:10px 12px;border-radius:12px;background:#fff;
    border:1px solid rgba(13,148,136,.14);font-size:14px;color:var(--ink2);
  }
  .flow-step span{
    font-size:12px;font-weight:700;color:#0b6f68;
    background:rgba(13,148,136,.12);border-radius:8px;padding:2px 7px;
  }
  .panel-tags{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:14px}
  .panel-tags span{
    font-size:12.5px;padding:4px 10px;border-radius:999px;
    background:#fff;border:1px solid rgba(13,148,136,.2);color:#2b5a58;
  }
  .panel-foot{margin:0;font-size:13px;color:var(--muted)}

  .metrics{
    position:relative;margin-top:40px;
    display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;
    background:rgba(255,255,255,.86);
    border:1px solid var(--line);border-radius:18px;padding:16px;
    box-shadow:var(--shadow);
  }
  .metric{text-align:center;padding:10px 8px;border-radius:12px}
  .metric strong{display:block;font-size:clamp(1.25rem,2.6vw,1.7rem);color:#0b6f68;letter-spacing:-.01em}
  .metric span{font-size:13px;color:var(--muted)}

  /* generic cards */
  .cards{display:grid;gap:18px}
  .cards-3{grid-template-columns:repeat(3,minmax(0,1fr))}
  .cards-2{grid-template-columns:repeat(2,minmax(0,1fr))}
  .card{
    background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
    padding:20px;box-shadow:0 6px 18px rgba(11,90,84,.05);
    transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
  }
  .card:hover{transform:translateY(-4px);box-shadow:0 16px 32px rgba(11,90,84,.12);border-color:rgba(13,148,136,.32)}
  .card h3{margin-bottom:8px}
  .card p{margin:0;font-size:14.5px;color:var(--muted)}
  .card .tag{
    display:inline-block;margin-bottom:10px;font-size:12px;font-weight:600;
    padding:3px 10px;border-radius:999px;color:#0b6f68;background:rgba(13,148,136,.1);
  }

  /* about */
  .split{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);gap:32px;align-items:start}
  .checklist{list-style:none;margin:0;padding:0;display:grid;gap:10px}
  .checklist li{
    position:relative;padding:10px 14px 10px 38px;font-size:14.5px;color:var(--ink2);
    background:#fff;border:1px solid var(--line);border-radius:12px;
  }
  .checklist li::before{
    content:"";position:absolute;left:14px;top:50%;width:14px;height:8px;
    margin-top:-6px;border-left:2px solid var(--teal);border-bottom:2px solid var(--teal);
    transform:rotate(-45deg);
  }
  .tagcloud{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}
  .tagcloud span{
    font-size:13px;padding:6px 12px;border-radius:999px;
    background:#fff;border:1px solid rgba(13,148,136,.2);color:#2b5a58;
    transition:background .2s ease,color .2s ease,transform .2s ease;
  }
  .tagcloud span:hover{background:rgba(13,148,136,.1);transform:translateY(-2px)}

  /* steps */
  .steps{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:14px}
  .step{
    background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 16px;
    box-shadow:0 6px 16px rgba(11,90,84,.05);
  }
  .step b{
    display:inline-flex;align-items:center;justify-content:center;
    width:30px;height:30px;border-radius:10px;margin-bottom:10px;
    background:linear-gradient(135deg,#0d9488,#22d3ee);color:#fff;font-size:13px;
  }
  .step h3{font-size:.98rem;margin-bottom:6px}
  .step p{margin:0;font-size:13.5px;color:var(--muted)}

  /* service network */
  .network{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
  .net-item{
    background:linear-gradient(150deg,#ffffff,#effbf9);
    border:1px solid var(--line);border-radius:16px;padding:20px;
  }
  .net-item h3{color:#0b6f68}

  /* gallery */
  .gallery{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
  .shot{
    background:#eef8f7;border:1px solid var(--line);border-radius:14px;
    aspect-ratio:4/3;display:flex;align-items:center;justify-content:center;
    padding:10px;overflow:hidden;transition:box-shadow .25s ease,transform .25s ease;
  }
  .shot:hover{transform:translateY(-3px);box-shadow:0 16px 30px rgba(11,90,84,.12)}
  .shot img{max-width:100%;height:auto;object-fit:contain;border-radius:8px}

  /* review */
  .score-bar{
    display:flex;flex-wrap:wrap;align-items:center;gap:18px 34px;
    padding:20px 24px;border-radius:18px;
    background:linear-gradient(120deg,rgba(13,148,136,.12),rgba(34,211,238,.12));
    border:1px solid rgba(13,148,136,.24);
  }
  .score-bar .score-item{display:flex;flex-direction:column;gap:2px}
  .score-bar .score-item strong{font-size:1.5rem;color:#0b6f68;line-height:1.2}
  .score-bar .score-item span{font-size:13px;color:var(--muted)}
  .stars{color:#0d9488;letter-spacing:3px;font-size:1.15rem}
  .table-wrap{overflow-x:auto;margin-top:22px;border:1px solid var(--line);border-radius:14px;background:#fff}
  table{border-collapse:collapse;width:100%;min-width:760px;font-size:14.5px}
  th,td{padding:13px 16px;text-align:left;border-bottom:1px solid rgba(13,148,136,.12);vertical-align:top}
  thead th{background:rgba(13,148,136,.08);color:#0b6f68;font-weight:700;white-space:nowrap}
  tbody tr:last-child td{border-bottom:none}
  tbody tr:hover td{background:rgba(13,148,136,.04)}
  td.hl{color:#0b6f68;font-weight:600}

  /* reviews */
  .review-card blockquote{margin:0;font-size:14.5px;color:var(--ink2);line-height:1.8}
  .review-card figcaption{margin-top:14px;padding-top:12px;border-top:1px dashed rgba(13,148,136,.24);font-size:13.5px;color:var(--muted)}
  .review-card figcaption b{color:var(--ink);display:block;font-size:14px}

  /* help / wiki */
  .mini-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
  .mini{
    background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px;
    font-size:14px;color:var(--ink2);
  }
  .mini b{display:block;color:var(--ink);margin-bottom:6px;font-size:.98rem}

  /* news */
  .news-list{list-style:none;margin:0;padding:0;display:grid;gap:12px}
  .news-list li{
    background:#fff;border:1px solid var(--line);border-radius:14px;
    transition:transform .22s ease,box-shadow .22s ease,border-color .22s ease;
  }
  .news-list li:hover{transform:translateX(4px);box-shadow:0 12px 26px rgba(11,90,84,.1);border-color:rgba(13,148,136,.32)}
  .news-list a{
    display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px;
    padding:15px 18px;text-decoration:none;color:var(--ink);font-weight:600;font-size:15px;
  }
  .news-list a span{font-size:13px;font-weight:500;color:var(--muted)}

  /* faq */
  .faq{display:grid;gap:10px}
  .faq-item{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden}
  .faq-item.open{border-color:rgba(13,148,136,.35);box-shadow:0 10px 24px rgba(11,90,84,.08)}
  .faq-q{margin:0}
  .faq-q button{
    display:flex;align-items:center;justify-content:space-between;gap:14px;width:100%;
    padding:16px 18px;background:none;border:none;cursor:pointer;text-align:left;
    font-family:inherit;font-size:15px;font-weight:600;color:var(--ink);line-height:1.5;
  }
  .faq-q button::after{
    content:"";flex:0 0 auto;width:9px;height:9px;
    border-right:2px solid var(--teal);border-bottom:2px solid var(--teal);
    transform:rotate(45deg);transition:transform .25s ease;margin-top:-4px;
  }
  .faq-item.open .faq-q button::after{transform:rotate(-135deg);margin-top:2px}
  .faq-a{max-height:0;overflow:hidden;transition:max-height .32s ease}
  .faq-a p{margin:0;padding:0 18px 16px;font-size:14.5px;color:var(--muted)}

  /* join */
  .join-card{
    display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:26px;align-items:center;
    background:linear-gradient(130deg,rgba(13,148,136,.12),rgba(34,211,238,.14));
    border:1px solid rgba(13,148,136,.26);border-radius:22px;padding:28px;
  }
  .join-points{list-style:none;margin:0;padding:0;display:grid;gap:9px;font-size:14.5px;color:var(--ink2)}
  .join-points li{position:relative;padding-left:20px}
  .join-points li::before{
    content:"";position:absolute;left:2px;top:.6em;width:8px;height:8px;border-radius:2px;
    background:linear-gradient(135deg,#0d9488,#22d3ee);
  }

  /* contact */
  .contact-grid{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);gap:26px;align-items:start}
  form{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px;box-shadow:var(--shadow)}
  .field{margin-bottom:14px}
  .field label{display:block;font-size:13.5px;font-weight:600;color:var(--ink2);margin-bottom:6px}
  .field input,.field select,.field textarea{
    width:100%;padding:11px 13px;border-radius:10px;font-family:inherit;font-size:14.5px;
    color:var(--ink);background:#f8fdfc;border:1px solid rgba(13,148,136,.26);
    transition:border-color .2s ease,box-shadow .2s ease,background .2s ease;
  }
  .field textarea{resize:vertical;min-height:110px}
  .field input:focus,.field select:focus,.field textarea:focus{
    outline:none;background:#fff;border-color:var(--teal);box-shadow:0 0 0 3px rgba(13,148,136,.14);
  }
  form .btn{width:100%;margin-top:4px}
  .form-note{margin:12px 0 0;font-size:12.5px;color:var(--muted)}
  .contact-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px;box-shadow:var(--shadow)}
  .contact-list{list-style:none;margin:0 0 18px;padding:0;display:grid;gap:10px;font-size:14.5px;color:var(--ink2)}
  .contact-list li{display:flex;gap:10px}
  .contact-list li b{flex:0 0 78px;color:var(--muted);font-weight:600}
  .qr-box{display:flex;align-items:center;gap:14px;padding-top:16px;border-top:1px dashed rgba(13,148,136,.24)}
  .qr-box img{width:120px;height:auto;border-radius:10px;border:1px solid var(--line);background:#fff}
  .qr-box p{margin:0;font-size:13.5px;color:var(--muted)}

  /* footer */
  .site-footer{
    margin-top:0;padding:32px 0 20px;
    background:linear-gradient(180deg,rgba(232,248,246,.7),rgba(214,241,238,.9));
    border-top:1px solid rgba(13,148,136,.22);
    color:#123c3d;
  }
  .footer-top{display:flex;flex-wrap:wrap;gap:20px 40px;justify-content:space-between;align-items:flex-start}
  .footer-brand{max-width:420px}
  .footer-brand strong{display:block;font-size:1.05rem;color:#0b3f41;margin-bottom:6px}
  .footer-brand p{margin:0;font-size:13.5px;color:#2f5c5e;line-height:1.7}
  .footer-links-title{font-size:13.5px;font-weight:700;color:#0b3f41;margin:0 0 8px}
  .footer-links{display:flex;flex-wrap:wrap;gap:8px 16px;list-style:none;margin:0;padding:0;font-size:13.5px}
  .footer-links a{color:#0b6f68;text-decoration:none}
  .footer-links a:hover{text-decoration:underline}
  .footer-bottom{
    margin-top:22px;padding-top:14px;border-top:1px solid rgba(13,148,136,.22);
    font-size:13px;color:#2f5c5e;
    display:flex;flex-wrap:wrap;gap:8px 18px;justify-content:space-between;align-items:center;
  }
  .footer-bottom a{color:#0b6f68;text-decoration:none}

  /* floating */
  .float-dock{position:fixed;right:16px;bottom:18px;z-index:80;display:flex;flex-direction:column;gap:10px;align-items:flex-end}
  .float-btn{
    display:inline-flex;align-items:center;justify-content:center;gap:6px;
    padding:10px 14px;border-radius:999px;cursor:pointer;font-family:inherit;font-size:14px;font-weight:600;
    color:#fff;background:linear-gradient(135deg,#0d9488,#0f9bb8);border:none;
    box-shadow:0 10px 24px rgba(13,148,136,.3);
    transition:transform .2s ease,opacity .2s ease;
  }
  .float-btn:hover{transform:translateY(-2px)}
  .to-top{opacity:0;pointer-events:none;background:#fff;color:#0b6f68;border:1px solid rgba(13,148,136,.3);box-shadow:0 8px 18px rgba(11,90,84,.12)}
  .to-top.show{opacity:1;pointer-events:auto}
  .kf-panel{
    display:none;width:230px;padding:16px;border-radius:16px;background:#fff;
    border:1px solid var(--line);box-shadow:0 18px 36px rgba(11,90,84,.18);
    color:var(--ink);
  }
  .kf-panel.open{display:block;animation:rise .35s ease}
  .kf-panel p{margin:0 0 8px;font-size:13px;color:var(--muted)}
  .kf-panel img{display:block;width:100%;height:auto;border-radius:10px;margin-bottom:10px;border:1px solid var(--line)}
  .kf-panel a{font-size:13.5px;color:#0b6f68;text-decoration:none;display:block;margin-top:4px}

  @keyframes rise{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}
  @keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-8px)}}
  .reveal.pre{opacity:0;transform:translateY(18px)}
  .reveal.in{animation:rise .65s cubic-bezier(.22,.7,.3,1)}

  @media (max-width:1000px){
    .nav-toggle{display:inline-flex}
    .nav-wrap{display:none;width:100%;order:4}
    .nav-wrap.open{display:block}
    .nav-links{flex-direction:column;align-items:stretch;gap:0;width:100%;padding:8px 0}
    .nav-links a{padding:11px 12px}
    .hero-grid{grid-template-columns:minmax(0,1fr);gap:30px}
    .split,.contact-grid,.join-card{grid-template-columns:minmax(0,1fr)}
    .cards-3{grid-template-columns:repeat(2,minmax(0,1fr))}
    .steps{grid-template-columns:repeat(2,minmax(0,1fr))}
    .network{grid-template-columns:minmax(0,1fr)}
    .gallery{grid-template-columns:repeat(2,minmax(0,1fr))}
    .mini-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
    .metrics{grid-template-columns:repeat(2,minmax(0,1fr))}
  }
  @media (max-width:640px){
    section{padding:42px 0}
    .hero{padding-top:30px}
    .cards-3,.cards-2,.gallery,.mini-grid,.steps{grid-template-columns:minmax(0,1fr)}
    .metrics{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;padding:12px}
    .hero-panel{padding:18px}
    .score-bar{padding:16px}
    .nav-cta{padding:8px 12px;font-size:13px}
    .float-dock{right:12px;bottom:12px}
  }
  @media (prefers-reduced-motion:reduce){
    *,*::before,*::after{animation:none!important;transition:none!important}
    html{scroll-behavior:auto}
    .reveal.pre{opacity:1;transform:none}
  }