*{box-sizing:border-box;}
  :root{
    --ink:#0f172a;
    --ink-2:#334155;
    --ink-3:#64748b;
    --line:#e8eaf7;
    --brand:#4f46e5;
    --brand-2:#7c3aed;
    --c-cyan:#06b6d4;
    --c-pink:#ec4899;
    --c-amber:#f59e0b;
    --c-green:#10b981;
    --radius:18px;
  }
  html{scroll-behavior:smooth;}
  body{
    margin:0;
    font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
    color:var(--ink);
    background-color:#f7f8fd;
    background-image:
      radial-gradient(900px 560px at 6% -10%, rgba(124,58,237,.11), transparent 70%),
      radial-gradient(760px 500px at 98% 2%, rgba(6,182,212,.11), transparent 70%),
      radial-gradient(820px 560px at 48% 104%, rgba(236,72,153,.08), transparent 72%);
    background-attachment:fixed;
    -webkit-font-smoothing:antialiased;
    line-height:1.7;
  }
  h1,h2,h3,h4{margin:0;font-weight:800;color:var(--ink);}
  p{margin:0;}
  img{max-width:100%;height:auto;display:block;}
  ul,ol{list-style:none;margin:0;padding:0;}
  a{color:inherit;}
  .container{width:100%;max-width:1180px;margin:0 auto;padding:0 22px;}
  section{scroll-margin-top:86px;}

  /* ---------- buttons ---------- */
  .btn{
    display:inline-flex;align-items:center;justify-content:center;gap:8px;
    border-radius:12px;font-weight:700;font-size:15px;padding:12px 22px;
    text-decoration:none;border:1px solid transparent;cursor:pointer;
    transition:transform .22s ease,box-shadow .22s ease,background .22s ease,border-color .22s ease;
    font-family:inherit;line-height:1.2;
  }
  .btn:active{transform:translateY(1px) scale(.99);}
  .btn-primary{
    background:linear-gradient(118deg,#4f46e5,#7c3aed 52%,#0891b2);
    color:#fff;box-shadow:0 10px 26px rgba(79,70,229,.28);
  }
  .btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 34px rgba(79,70,229,.34);}
  .btn-ghost{background:#fff;color:#312e81;border-color:#dcdcf5;box-shadow:0 6px 16px rgba(29,32,84,.06);}
  .btn-ghost:hover{transform:translateY(-2px);border-color:#b9b6f2;box-shadow:0 12px 26px rgba(29,32,84,.10);}
  .btn-lg{padding:14px 28px;font-size:16px;border-radius:14px;}
  .btn-sm{padding:9px 16px;font-size:14px;border-radius:10px;}

  /* ---------- header ---------- */
  .site-header{
    position:sticky;top:0;z-index:60;
    background:rgba(255,255,255,.88);
    backdrop-filter:blur(12px);
    -webkit-backdrop-filter:blur(12px);
    border-bottom:1px solid var(--line);
    transition:box-shadow .25s ease;
  }
  .site-header.scrolled{box-shadow:0 8px 26px rgba(29,32,84,.09);}
  .header-inner{
    display:flex;align-items:center;justify-content:space-between;gap:16px;
    min-height:70px;position:relative;
  }
  .brand{display:flex;align-items:center;gap:10px;text-decoration:none;flex-shrink:0;}
  .brand .ai-page-logo{width:auto;max-height:36px;display:block;}
  .brand-name{font-size:17px;font-weight:800;color:var(--ink);letter-spacing:.6px;white-space:nowrap;}
  .nav{display:block;}
  .nav-links{display:flex;gap:0;align-items:center;justify-content:center;}
  .nav-links a{
    display:block;padding:9px 13px;font-size:15px;color:var(--ink-2);
    text-decoration:none;border-radius:10px;white-space:nowrap;
    transition:color .2s ease,background .2s ease;
  }
  .nav-links a:hover{color:var(--brand);background:rgba(79,70,229,.08);}
  .header-actions{display:flex;align-items:center;gap:10px;flex-shrink:0;}
  .nav-toggle{
    display:none;align-items:center;justify-content:center;width:42px;height:42px;
    border-radius:12px;border:1px solid var(--line);background:#fff;cursor:pointer;padding:0;
  }
  .nav-toggle span{display:block;width:18px;height:2px;background:#312e81;border-radius:2px;position:relative;}
  .nav-toggle span::before,.nav-toggle span::after{
    content:"";position:absolute;left:0;width:18px;height:2px;background:#312e81;border-radius:2px;
    transition:transform .25s ease;
  }
  .nav-toggle span::before{top:-6px;}
  .nav-toggle span::after{top:6px;}

  /* ---------- hero ---------- */
  .hero{position:relative;overflow:hidden;padding:54px 0 46px;}
  .hero::before{
    content:"";position:absolute;inset:0;pointer-events:none;
    background:
      radial-gradient(600px 340px at 10% 6%, rgba(124,58,237,.16), transparent 68%),
      radial-gradient(540px 320px at 84% 10%, rgba(6,182,212,.16), transparent 68%),
      radial-gradient(560px 340px at 62% 98%, rgba(245,158,11,.12), transparent 70%);
  }
  .hero-inner{
    position:relative;display:grid;grid-template-columns:1.12fr .88fr;
    gap:40px;align-items:center;
  }
  .eyebrow{
    display:inline-flex;align-items:center;gap:8px;padding:6px 14px;border-radius:999px;
    background:rgba(79,70,229,.10);color:#4338ca;font-size:13px;font-weight:800;letter-spacing:.5px;
  }
  .eyebrow::before{
    content:"";width:8px;height:8px;border-radius:3px;
    background:linear-gradient(135deg,#ec4899,#f59e0b);display:inline-block;
  }
  .hero h1{
    font-size:clamp(28px,4.2vw,46px);line-height:1.22;letter-spacing:-.6px;
    margin:18px 0 16px;
  }
  .hero-lead{font-size:16px;line-height:1.85;color:#475569;max-width:620px;}
  .hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:26px;}
  .hero-points{display:flex;flex-wrap:wrap;gap:10px 20px;margin-top:24px;}
  .hero-points li{position:relative;padding-left:18px;font-size:14px;color:#475569;font-weight:600;}
  .hero-points li::before{
    content:"";position:absolute;left:0;top:8px;width:8px;height:8px;border-radius:3px;
    background:linear-gradient(135deg,#4f46e5,#7c3aed);
  }
  .hero-points li:nth-child(2)::before{background:linear-gradient(135deg,#06b6d4,#10b981);}
  .hero-points li:nth-child(3)::before{background:linear-gradient(135deg,#f59e0b,#ec4899);}
  .panel-card{
    position:relative;overflow:hidden;background:#fff;border:1px solid var(--line);
    border-radius:22px;padding:26px 24px;box-shadow:0 26px 60px rgba(35,38,96,.13);
  }
  .panel-card::before{
    content:"";position:absolute;top:0;left:0;right:0;height:5px;
    background:linear-gradient(90deg,#4f46e5,#06b6d4,#10b981,#f59e0b,#ec4899);
  }
  .panel-title{font-size:15px;font-weight:800;color:var(--ink);letter-spacing:.6px;margin-bottom:18px;}
  .panel-list{display:grid;gap:13px;}
  .panel-list li{display:flex;align-items:center;gap:12px;font-size:14px;color:#475569;}
  .chip{
    flex-shrink:0;width:46px;text-align:center;padding:5px 0;border-radius:9px;
    font-size:12px;font-weight:800;color:#fff;letter-spacing:.5px;
  }
  .chip-a{background:linear-gradient(135deg,#4f46e5,#7c3aed);}
  .chip-b{background:linear-gradient(135deg,#0891b2,#06b6d4);}
  .chip-c{background:linear-gradient(135deg,#d97706,#f59e0b);}
  .chip-d{background:linear-gradient(135deg,#059669,#10b981);}
  .panel-foot{
    margin-top:18px;padding-top:14px;border-top:1px dashed var(--line);
    font-size:13px;color:#64748b;
  }
  .metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:44px;position:relative;}
  .metric{
    background:rgba(255,255,255,.9);border:1px solid var(--line);border-radius:16px;
    padding:18px 20px;backdrop-filter:blur(6px);
    transition:transform .25s ease,box-shadow .25s ease;
  }
  .metric:hover{transform:translateY(-4px);box-shadow:0 16px 36px rgba(35,38,96,.10);}
  .metric b{display:block;font-size:26px;font-weight:800;letter-spacing:-.5px;line-height:1.3;}
  .metric span{font-size:13px;color:#64748b;}
  .metric:nth-child(1) b{color:#4f46e5;}
  .metric:nth-child(2) b{color:#0891b2;}
  .metric:nth-child(3) b{color:#d97706;}
  .metric:nth-child(4) b{color:#059669;}

  /* ---------- section common ---------- */
  .sec{padding:70px 0;}
  .sec-head{max-width:780px;margin:0 auto 42px;text-align:center;}
  .sec-tag{
    display:inline-block;padding:6px 14px;border-radius:999px;font-size:12.5px;font-weight:800;
    letter-spacing:.8px;color:#4338ca;background:rgba(79,70,229,.09);margin-bottom:14px;
  }
  .sec-head h2{font-size:clamp(22px,3vw,32px);line-height:1.35;letter-spacing:-.4px;margin-bottom:14px;}
  .sec-head p{font-size:15px;line-height:1.85;color:#64748b;}
  .sec-head.split{max-width:none;text-align:left;display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:18px;}
  .sec-head.split .split-text{max-width:700px;}

  /* ---------- about ---------- */
  .about-grid{display:grid;grid-template-columns:1fr 1fr;gap:36px;align-items:start;}
  .about-text h3{font-size:19px;margin-bottom:14px;}
  .about-text p{font-size:15px;line-height:1.9;color:#475569;margin-bottom:14px;}
  .about-list{display:grid;gap:14px;}
  .about-list li{
    display:flex;gap:12px;background:#fff;border:1px solid var(--line);
    border-left:4px solid var(--brand);border-radius:14px;padding:16px 18px;
    transition:transform .24s ease,box-shadow .24s ease;
  }
  .about-list li:nth-child(2){border-left-color:var(--c-cyan);}
  .about-list li:nth-child(3){border-left-color:var(--c-green);}
  .about-list li:nth-child(4){border-left-color:var(--c-amber);}
  .about-list li:nth-child(5){border-left-color:var(--c-pink);}
  .about-list li:hover{transform:translateY(-3px);box-shadow:0 14px 32px rgba(35,38,96,.10);}
  .about-list strong{display:block;font-size:15px;color:var(--ink);margin-bottom:4px;}
  .about-list p{font-size:13.5px;line-height:1.7;color:#64748b;}

  .tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:34px;}
  .tags span{
    padding:7px 15px;border-radius:999px;background:#fff;border:1px solid #e3e6f5;
    font-size:13px;font-weight:600;color:#334155;
    transition:transform .2s ease,color .2s ease,border-color .2s ease,box-shadow .2s ease;
  }
  .tags span:hover{
    transform:translateY(-3px);color:#4338ca;border-color:#c7c4f4;
    box-shadow:0 10px 22px rgba(79,70,229,.13);
  }

  /* ---------- services ---------- */
  .svc-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px;}
  .svc{
    position:relative;overflow:hidden;background:#fff;border:1px solid var(--line);
    border-radius:16px;padding:22px 20px;
    transition:transform .26s ease,box-shadow .26s ease,border-color .26s ease;
  }
  .svc:hover{transform:translateY(-6px);box-shadow:0 20px 42px rgba(35,38,96,.13);border-color:#d6d9f3;}
  .svc-dot{
    display:block;width:30px;height:30px;border-radius:10px;margin-bottom:14px;
    background:linear-gradient(135deg,#4f46e5,#7c3aed);
  }
  .svc:nth-child(3n+2) .svc-dot{background:linear-gradient(135deg,#0891b2,#06b6d4);}
  .svc:nth-child(3n+3) .svc-dot{background:linear-gradient(135deg,#d97706,#f59e0b);}
  .svc:nth-child(4n+4) .svc-dot{background:linear-gradient(135deg,#059669,#10b981);}
  .svc:nth-child(5n+5) .svc-dot{background:linear-gradient(135deg,#db2777,#ec4899);}
  .svc h3{font-size:16px;margin-bottom:8px;}
  .svc p{font-size:13.5px;line-height:1.72;color:#64748b;}

  /* ---------- workbench ---------- */
  .wt-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:18px;}
  .wt{
    background:#fff;border:1px solid var(--line);border-radius:16px;padding:24px 22px;
    position:relative;overflow:hidden;transition:transform .26s ease,box-shadow .26s ease;
  }
  .wt::after{
    content:"";position:absolute;top:0;left:0;width:100%;height:4px;
    background:linear-gradient(90deg,#4f46e5,#06b6d4);
    transform:scaleX(.22);transform-origin:left;transition:transform .32s ease;
  }
  .wt:hover{transform:translateY(-5px);box-shadow:0 20px 42px rgba(35,38,96,.12);}
  .wt:hover::after{transform:scaleX(1);}
  .wt h3{font-size:16.5px;margin-bottom:9px;}
  .wt p{font-size:13.8px;line-height:1.75;color:#64748b;}

  /* ---------- steps ---------- */
  .steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:16px;}
  .step{
    background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px 20px;
    transition:transform .25s ease,box-shadow .25s ease;
  }
  .step:hover{transform:translateY(-4px);box-shadow:0 16px 36px rgba(35,38,96,.10);}
  .step-num{
    width:34px;height:34px;border-radius:10px;display:grid;place-items:center;
    font-size:14px;font-weight:800;color:#fff;margin-bottom:13px;
    background:linear-gradient(135deg,#4f46e5,#7c3aed);
  }
  .step:nth-child(2) .step-num{background:linear-gradient(135deg,#0891b2,#06b6d4);}
  .step:nth-child(3) .step-num{background:linear-gradient(135deg,#059669,#10b981);}
  .step:nth-child(4) .step-num{background:linear-gradient(135deg,#d97706,#f59e0b);}
  .step:nth-child(5) .step-num{background:linear-gradient(135deg,#db2777,#ec4899);}
  .step h3{font-size:15.5px;margin-bottom:8px;}
  .step p{font-size:13.4px;line-height:1.72;color:#64748b;}

  /* ---------- solutions ---------- */
  .sol-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;}
  .sol{
    background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px 20px;
    transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
  }
  .sol:hover{transform:translateY(-4px);border-color:#d6d9f3;box-shadow:0 16px 36px rgba(35,38,96,.10);}
  .sol h3{font-size:15.5px;margin-bottom:8px;}
  .sol p{font-size:13.4px;line-height:1.72;color:#64748b;}

  /* ---------- network ---------- */
  .net-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px;}
  .net{
    background:linear-gradient(160deg,#ffffff,#fbfbff);
    border:1px solid var(--line);border-radius:16px;padding:22px 20px;
    transition:transform .25s ease,box-shadow .25s ease;
  }
  .net:hover{transform:translateY(-4px);box-shadow:0 16px 36px rgba(35,38,96,.10);}
  .net h3{font-size:15.5px;margin-bottom:8px;}
  .net p{font-size:13.4px;line-height:1.72;color:#64748b;}

  /* ---------- cases ---------- */
  .case-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:18px;}
  .case{
    background:#fff;border:1px solid var(--line);border-radius:18px;overflow:hidden;
    transition:transform .26s ease,box-shadow .26s ease;
  }
  .case:hover{transform:translateY(-5px);box-shadow:0 20px 44px rgba(35,38,96,.13);}
  .case-media{aspect-ratio:4/3;background:#f1f3fb;overflow:hidden;}
  .case-media img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease;}
  .case:hover .case-media img{transform:scale(1.05);}
  .case-body{padding:16px 18px 18px;}
  .case-body h3{font-size:15.5px;margin-bottom:6px;}
  .case-body p{font-size:13.4px;line-height:1.7;color:#64748b;}

  /* ---------- review ---------- */
  .review-top{display:grid;grid-template-columns:.9fr 1.1fr;gap:24px;align-items:stretch;margin-bottom:26px;}
  .score-card{
    background:linear-gradient(150deg,#ffffff,#f7f7ff);
    border:1px solid var(--line);border-radius:20px;padding:28px 24px;text-align:center;
    box-shadow:0 16px 40px rgba(35,38,96,.08);
  }
  .score-main{font-size:52px;font-weight:800;line-height:1.1;letter-spacing:-2px;color:#4338ca;}
  .score-main span{font-size:18px;font-weight:700;color:#94a3b8;letter-spacing:0;margin-left:4px;}
  .score-stars{font-size:20px;color:#f59e0b;letter-spacing:4px;margin:10px 0 8px;}
  .score-card p{font-size:14px;color:#64748b;}
  .review-note{
    background:#fff;border:1px solid var(--line);border-radius:20px;padding:26px 24px;
    box-shadow:0 16px 40px rgba(35,38,96,.06);
  }
  .review-note h3{font-size:17px;margin-bottom:12px;}
  .review-note p{font-size:14px;line-height:1.85;color:#475569;margin-bottom:10px;}
  .review-note p:last-child{margin-bottom:0;}

  /* ---------- table ---------- */
  .table-wrap{
    overflow-x:auto;border-radius:16px;border:1px solid var(--line);background:#fff;
    box-shadow:0 14px 34px rgba(35,38,96,.06);
  }
  table{width:100%;border-collapse:collapse;min-width:680px;font-size:14px;}
  thead th{
    background:#f4f5fe;color:#1e1b4b;font-weight:800;text-align:left;
    padding:15px 18px;white-space:nowrap;font-size:14px;
  }
  tbody td{padding:14px 18px;border-top:1px solid #eef0f9;color:#475569;vertical-align:top;line-height:1.7;}
  tbody tr:hover{background:#fafbff;}
  tbody td:first-child{color:#1e293b;font-weight:700;}
  .hl{color:#4338ca;font-weight:700;}
  .table-tip{font-size:13px;color:#94a3b8;margin-top:12px;text-align:center;}

  /* ---------- comments ---------- */
  .cmt-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:18px;}
  .cmt{
    background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px 22px;
    display:flex;flex-direction:column;gap:14px;
    transition:transform .25s ease,box-shadow .25s ease;
  }
  .cmt:hover{transform:translateY(-4px);box-shadow:0 18px 40px rgba(35,38,96,.11);}
  .cmt-stars{font-size:14px;color:#f59e0b;letter-spacing:3px;}
  .cmt-text{font-size:14px;line-height:1.85;color:#475569;flex:1;}
  .cmt-user{display:flex;align-items:center;gap:12px;padding-top:14px;border-top:1px dashed var(--line);}
  .avatar{
    width:38px;height:38px;border-radius:12px;display:grid;place-items:center;
    color:#fff;font-weight:800;font-size:15px;flex-shrink:0;
    background:linear-gradient(135deg,#4f46e5,#7c3aed);
  }
  .cmt:nth-child(2) .avatar{background:linear-gradient(135deg,#0891b2,#06b6d4);}
  .cmt:nth-child(3) .avatar{background:linear-gradient(135deg,#059669,#10b981);}
  .cmt:nth-child(4) .avatar{background:linear-gradient(135deg,#d97706,#f59e0b);}
  .cmt:nth-child(5) .avatar{background:linear-gradient(135deg,#db2777,#ec4899);}
  .cmt:nth-child(6) .avatar{background:linear-gradient(135deg,#4338ca,#0891b2);}
  .cmt-user strong{display:block;font-size:14px;color:var(--ink);}
  .cmt-user small{font-size:12.5px;color:#94a3b8;}

  /* ---------- help ---------- */
  .help-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:16px;}
  .help-card{
    display:block;text-decoration:none;background:#fff;border:1px solid var(--line);
    border-radius:16px;padding:22px 20px;
    transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
  }
  .help-card:hover{transform:translateY(-4px);border-color:#c7c4f4;box-shadow:0 16px 36px rgba(79,70,229,.13);}
  .help-card h3{font-size:15.5px;margin-bottom:8px;}
  .help-card p{font-size:13.4px;line-height:1.72;color:#64748b;}

  /* ---------- faq ---------- */
  .faq-list{display:grid;gap:12px;max-width:900px;margin:0 auto;}
  .faq-item{
    background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;
    transition:border-color .25s ease,box-shadow .25s ease;
  }
  .faq-item.open{border-color:#c7c4f4;box-shadow:0 14px 32px rgba(79,70,229,.11);}
  .faq-q{
    width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
    background:transparent;border:0;padding:17px 20px;cursor:pointer;text-align:left;
    font-size:15px;font-weight:700;color:#1e293b;font-family:inherit;line-height:1.5;
  }
  .faq-q:hover{color:#4338ca;}
  .faq-q .ico{
    flex-shrink:0;width:22px;height:22px;border-radius:7px;position:relative;
    background:rgba(79,70,229,.10);transition:transform .3s ease,background .3s ease;
  }
  .faq-q .ico::before,.faq-q .ico::after{
    content:"";position:absolute;background:#4338ca;border-radius:2px;
    transition:transform .3s ease,opacity .3s ease;
  }
  .faq-q .ico::before{left:6px;top:10px;width:10px;height:2px;}
  .faq-q .ico::after{left:10px;top:6px;width:2px;height:10px;}
  .faq-item.open .faq-q .ico{background:linear-gradient(135deg,#4f46e5,#7c3aed);transform:rotate(180deg);}
  .faq-item.open .faq-q .ico::before{background:#fff;}
  .faq-item.open .faq-q .ico::after{opacity:0;}
  .faq-body{display:grid;grid-template-rows:0fr;transition:grid-template-rows .32s ease;}
  .faq-item.open .faq-body{grid-template-rows:1fr;}
  .faq-body-inner{overflow:hidden;}
  .faq-a{padding:0 20px 18px;font-size:14px;line-height:1.85;color:#64748b;}

  /* ---------- wiki ---------- */
  .wiki-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;}
  .wiki{
    background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px;
    transition:transform .25s ease,box-shadow .25s ease;
  }
  .wiki:hover{transform:translateY(-4px);box-shadow:0 16px 34px rgba(35,38,96,.10);}
  .wiki h3{font-size:15px;margin-bottom:8px;}
  .wiki p{font-size:13.4px;line-height:1.72;color:#64748b;}

  /* ---------- news ---------- */
  .news-list{display:grid;gap:12px;}
  .news-item{
    display:flex;align-items:center;justify-content:space-between;gap:18px;
    background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 22px;
    text-decoration:none;transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
  }
  .news-item:hover{transform:translateX(4px);border-color:#c7c4f4;box-shadow:0 14px 30px rgba(79,70,229,.12);}
  .news-item h3{font-size:15px;font-weight:700;color:#1e293b;margin:0 0 4px;}
  .news-item p{font-size:13px;color:#94a3b8;}
  .news-arrow{
    flex-shrink:0;width:32px;height:32px;border-radius:10px;display:grid;place-items:center;
    background:rgba(79,70,229,.09);color:#4338ca;font-size:15px;font-weight:800;
  }

  /* ---------- join ---------- */
  .join-wrap{
    position:relative;overflow:hidden;border-radius:24px;padding:44px 36px;
    background:linear-gradient(120deg,#eef0ff,#f6f0ff 48%,#e9f9ff);
    border:1px solid #e2e5f8;
    display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:26px;
  }
  .join-wrap::before{
    content:"";position:absolute;right:-60px;top:-60px;width:240px;height:240px;border-radius:50%;
    background:radial-gradient(circle,rgba(236,72,153,.18),transparent 70%);
  }
  .join-text{position:relative;max-width:660px;}
  .join-text h2{font-size:clamp(20px,2.6vw,28px);margin-bottom:12px;letter-spacing:-.3px;}
  .join-text p{font-size:14.5px;line-height:1.85;color:#475569;}
  .join-actions{position:relative;display:flex;flex-wrap:wrap;gap:12px;}

  /* ---------- contact ---------- */
  .contact-grid{display:grid;grid-template-columns:.95fr 1.05fr;gap:28px;align-items:start;}
  .contact-info{
    background:#fff;border:1px solid var(--line);border-radius:20px;padding:28px 26px;
    box-shadow:0 16px 38px rgba(35,38,96,.07);
  }
  .contact-info h3{font-size:17px;margin-bottom:16px;}
  .contact-list{display:grid;gap:12px;margin-bottom:22px;}
  .contact-list li{display:flex;gap:10px;font-size:14px;color:#475569;line-height:1.7;align-items:flex-start;}
  .contact-list li b{color:#1e293b;font-weight:700;flex-shrink:0;min-width:76px;}
  .contact-list a{color:#4338ca;text-decoration:none;font-weight:600;}
  .contact-list a:hover{text-decoration:underline;}
  .qr-box{
    display:flex;align-items:center;gap:16px;padding-top:18px;border-top:1px dashed var(--line);
  }
  .qr-box img{width:104px;height:104px;object-fit:contain;border-radius:12px;border:1px solid var(--line);background:#fff;}
  .qr-box span{font-size:13px;color:#64748b;line-height:1.75;}

  .form-card{
    background:#fff;border:1px solid var(--line);border-radius:20px;padding:28px 26px;
    box-shadow:0 16px 38px rgba(35,38,96,.07);
  }
  .form-card h3{font-size:17px;margin-bottom:6px;}
  .form-card .form-sub{font-size:13.5px;color:#94a3b8;margin-bottom:20px;}
  .form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:14px;}
  .field{display:flex;flex-direction:column;gap:7px;}
  .field label{font-size:13px;font-weight:700;color:#334155;}
  .field input,.field select,.field textarea{
    width:100%;padding:11px 14px;border-radius:11px;border:1px solid #e2e5f4;
    background:#fbfbfe;font-size:14px;color:#1e293b;font-family:inherit;
    transition:border-color .2s ease,box-shadow .2s ease,background .2s ease;
  }
  .field textarea{resize:vertical;min-height:108px;line-height:1.7;}
  .field input:focus,.field select:focus,.field textarea:focus{
    outline:none;border-color:#a5a0f0;background:#fff;box-shadow:0 0 0 4px rgba(79,70,229,.11);
  }
  .field select{appearance:none;-webkit-appearance:none;
    background-image:linear-gradient(45deg,transparent 50%,#64748b 50%),linear-gradient(135deg,#64748b 50%,transparent 50%);
    background-position:calc(100% - 20px) 19px,calc(100% - 15px) 19px;
    background-size:5px 5px,5px 5px;background-repeat:no-repeat;
  }
  .form-card .btn{width:100%;margin-top:18px;}
  .form-note{font-size:12.5px;color:#94a3b8;text-align:center;margin-top:12px;}

  /* ---------- footer ---------- */
  .site-footer{
    background:#151830;color:#c3c8e2;padding:46px 0 0;margin-top:22px;
  }
  .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:34px;padding-bottom:30px;}
  .footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:14px;}
  .footer-brand .ai-page-logo{max-height:34px;width:auto;background:#fff;border-radius:8px;padding:4px 8px;}
  .site-footer h3{font-size:15px;color:#fff;margin-bottom:14px;letter-spacing:.4px;}
  .site-footer p{font-size:13.5px;line-height:1.85;color:#a7adcf;}
  .footer-list{display:grid;gap:9px;}
  .footer-list li{font-size:13.5px;color:#a7adcf;line-height:1.7;}
  .footer-list a{color:#c3c8e2;text-decoration:none;transition:color .2s ease;}
  .footer-list a:hover{color:#fff;}
  .footer-links{
    border-top:1px solid rgba(255,255,255,.12);padding:20px 0;
    display:flex;flex-wrap:wrap;align-items:center;gap:8px 18px;
  }
  .footer-links .links-label{font-size:13px;color:#8f96bd;font-weight:700;}
  .footer-links a{font-size:13px;color:#b7bcda;text-decoration:none;transition:color .2s ease;}
  .footer-links a:hover{color:#fff;}
  .footer-bottom{
    border-top:1px solid rgba(255,255,255,.12);padding:16px 0 20px;
    font-size:12.5px;color:#8f96bd;text-align:center;line-height:1.8;
  }

  /* ---------- floating ---------- */
  .float-dock{position:fixed;right:18px;bottom:22px;z-index:80;display:flex;flex-direction:column;gap:12px;align-items:flex-end;}
  .float-btn{
    width:50px;height:50px;border-radius:16px;border:1px solid var(--line);background:#fff;
    display:grid;place-items:center;cursor:pointer;box-shadow:0 12px 28px rgba(35,38,96,.16);
    transition:transform .22s ease,box-shadow .22s ease;
    font-size:13px;font-weight:800;color:#4338ca;font-family:inherit;padding:0;
  }
  .float-btn:hover{transform:translateY(-3px);box-shadow:0 18px 34px rgba(35,38,96,.22);}
  .float-btn.primary{
    background:linear-gradient(135deg,#4f46e5,#7c3aed);color:#fff;border-color:transparent;
  }
  .float-btn svg{width:20px;height:20px;display:block;}
  .back-top{opacity:0;pointer-events:none;transform:translateY(10px);transition:opacity .28s ease,transform .28s ease;}
  .back-top.show{opacity:1;pointer-events:auto;transform:translateY(0);}
  .kf-panel{
    position:fixed;right:18px;bottom:86px;z-index:81;width:236px;
    background:#fff;border:1px solid var(--line);border-radius:18px;padding:16px;
    box-shadow:0 22px 50px rgba(35,38,96,.20);
    opacity:0;visibility:hidden;transform:translateY(12px);
    transition:opacity .26s ease,transform .26s ease,visibility .26s;
  }
  .kf-panel.open{opacity:1;visibility:visible;transform:translateY(0);}
  .kf-panel h4{font-size:14px;color:#1e293b;margin-bottom:10px;}
  .kf-panel img{width:100%;border-radius:12px;border:1px solid var(--line);object-fit:contain;}
  .kf-panel p{font-size:12.5px;color:#64748b;margin-top:10px;line-height:1.7;text-align:center;}

  /* ---------- animation ---------- */
  @keyframes fadeUp{from{opacity:0;transform:translateY(14px);}to{opacity:1;transform:none;}}
  .hero-copy > *{animation:fadeUp .68s ease both;}
  .hero-copy > *:nth-child(1){animation-delay:.04s;}
  .hero-copy > *:nth-child(2){animation-delay:.11s;}
  .hero-copy > *:nth-child(3){animation-delay:.18s;}
  .hero-copy > *:nth-child(4){animation-delay:.25s;}
  .hero-copy > *:nth-child(5){animation-delay:.32s;}
  .hero-panel{animation:fadeUp .8s ease .2s both;}
  .metrics > *{animation:fadeUp .7s ease both;}
  .metrics > *:nth-child(1){animation-delay:.4s;}
  .metrics > *:nth-child(2){animation-delay:.47s;}
  .metrics > *:nth-child(3){animation-delay:.54s;}
  .metrics > *:nth-child(4){animation-delay:.61s;}

  .reveal{opacity:0;transform:translateY(18px);transition:opacity .62s ease,transform .62s ease;}
  .reveal.in{opacity:1;transform:none;}

  @media (prefers-reduced-motion: reduce){
    *{animation-duration:.001ms !important;animation-delay:0ms !important;transition-duration:.001ms !important;}
    .reveal{opacity:1;transform:none;}
    html{scroll-behavior:auto;}
  }

  /* ---------- responsive ---------- */
  @media (max-width:1080px){
    .nav{
      position:absolute;top:100%;left:0;right:0;display:none;background:#fff;
      border-bottom:1px solid var(--line);box-shadow:0 20px 36px rgba(29,32,84,.12);
      padding:10px 22px 18px;
    }
    .nav.open{display:block;}
    .nav-links{flex-direction:column;align-items:stretch;gap:0;}
    .nav-links a{padding:13px 8px;border-bottom:1px dashed #eef0f8;font-size:15px;}
    .nav-toggle{display:inline-flex;}
    .header-actions .btn{display:none;}
    .hero-inner{grid-template-columns:1fr;gap:32px;}
    .about-grid{grid-template-columns:1fr;gap:26px;}
    .review-top{grid-template-columns:1fr;}
    .contact-grid{grid-template-columns:1fr;}
    .footer-grid{grid-template-columns:1fr 1fr;gap:26px;}
  }
  @media (max-width:720px){
    .sec{padding:54px 0;}
    .hero{padding:38px 0 34px;}
    .metrics{grid-template-columns:1fr 1fr;gap:12px;margin-top:34px;}
    .metric{padding:15px 16px;}
    .metric b{font-size:22px;}
    .form-row{grid-template-columns:1fr;}
    .footer-grid{grid-template-columns:1fr;}
    .join-wrap{padding:30px 22px;}
    .contact-info,.form-card{padding:22px 20px;}
    .score-main{font-size:44px;}
  }
  @media (max-width:480px){
    .metrics{grid-template-columns:1fr;}
    .hero-actions .btn{width:100%;}
    .brand-name{font-size:15px;}
  }