:root{
    --brand:#176FF2;--brand-dark:#0b57d0;--brand-light:#e8f1ff;--brand-glow:rgba(23,111,242,.28);
    --ink:#0d1424;--ink-2:#28324a;--muted:#6b7690;--line:#e4e8f2;
    --bg:#f7fafe;--bg-soft:#eef4fd;--bg-deep:#0a1f52;
    --radius:16px;--radius-lg:22px;
    --shadow-sm:0 2px 10px rgba(13,20,36,.05);--shadow:0 10px 30px rgba(13,20,36,.08);--shadow-lg:0 24px 60px rgba(13,20,36,.14);
    --max:1400px;
    --font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans CN",sans-serif;
  }
  *{margin:0;padding:0;box-sizing:border-box}
  html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
  body{font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.7;font-size:16px;overflow-x:hidden;-webkit-font-smoothing:antialiased}
  a{color:inherit;text-decoration:none}
  img,svg{display:block;max-width:100%}
  ul{list-style:none}
  .wrap{width:100%;max-width:var(--max);margin:0 auto;padding:0 40px}

  header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.86);backdrop-filter:saturate(180%) blur(14px);-webkit-backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid transparent;transition:border-color .3s,box-shadow .3s}
  header.scrolled{border-bottom-color:var(--line);box-shadow:0 4px 20px rgba(13,20,36,.06)}
  .nav{display:flex;align-items:center;justify-content:space-between;height:74px;gap:20px}
  .logo{display:flex;align-items:center;gap:11px;flex-shrink:0}
  .logo-mark{width:42px;height:42px;border-radius:12px;flex-shrink:0;background:linear-gradient(135deg,#3E9FFF,#176FF2 60%,#7B5CE6);display:grid;place-items:center;color:#fff;font-weight:800;font-size:20px;box-shadow:0 6px 18px var(--brand-glow)}
  .logo-txt strong{display:block;font-size:17px;font-weight:800;letter-spacing:.02em;line-height:1.2}
  .logo-txt span{display:block;font-size:11px;color:var(--muted);letter-spacing:.14em;text-transform:uppercase}
  .crumb{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--muted)}
  .crumb a{padding:6px 12px;border-radius:9px;transition:background .2s,color .2s}
  .crumb a:hover{background:var(--brand-light);color:var(--brand)}
  .crumb .cur{color:var(--ink-2);font-weight:500}
  .nav-cta{display:inline-flex;align-items:center;gap:7px;padding:10px 20px;border-radius:11px;background:var(--brand);color:#fff;font-weight:600;font-size:14.5px;box-shadow:0 6px 18px var(--brand-glow);transition:transform .2s,box-shadow .2s,background .2s;white-space:nowrap}
  .nav-cta:hover{background:var(--brand-dark);transform:translateY(-2px)}

  .p-hero{position:relative;overflow:hidden;color:#fff;padding:78px 0 88px;background:linear-gradient(135deg,#3BA0FF,#0070E0)}
  .p-hero.ph-store{background:linear-gradient(135deg,#4fd08a,#16A36B)}
  .p-hero.ph-inv{background:linear-gradient(135deg,#7dd3fc,#0ea5e9)}
  .p-hero.ph-ai{background:linear-gradient(135deg,#3BA0FF,#0070E0)}
  .p-hero.ph-live{background:linear-gradient(135deg,#B79BFF,#7B5CE6)}
  .p-hero.ph-ecom{background:linear-gradient(135deg,#FFB05C,#FF7A1A)}
  .p-hero.ph-dev{background:linear-gradient(135deg,#FFD166,#F0A500)}
  .p-hero::before{content:"";position:absolute;inset:0;opacity:.5;background-image:linear-gradient(rgba(255,255,255,.12) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.12) 1px,transparent 1px);background-size:52px 52px;-webkit-mask-image:radial-gradient(circle at 78% 20%,#000,transparent 72%);mask-image:radial-gradient(circle at 78% 20%,#000,transparent 72%)}
  .p-hero .wrap{position:relative;z-index:2;max-width:920px;text-align:center}
  .p-badge{display:inline-flex;align-items:center;gap:8px;padding:7px 15px;border-radius:999px;background:rgba(255,255,255,.18);border:1px solid rgba(255,255,255,.34);font-size:13.5px;font-weight:600;margin-bottom:20px}
  .p-hero h1{font-size:clamp(28px,4.2vw,46px);line-height:1.24;font-weight:800;letter-spacing:-.02em;margin-bottom:16px}
  .p-hero .lead{font-size:17px;color:rgba(255,255,255,.92);max-width:720px;margin:0 auto 28px}
  .p-chips{display:flex;gap:12px;flex-wrap:wrap;justify-content:center;margin-bottom:30px}
  .p-chips span{padding:8px 16px;border-radius:10px;background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.28);font-size:14px;font-weight:500}
  .btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;padding:14px 28px;border-radius:12px;font-weight:600;font-size:15.5px;border:1px solid transparent;cursor:pointer;transition:transform .2s,box-shadow .2s,background .2s,color .2s}
  .btn-w{background:#fff;color:var(--brand);box-shadow:0 10px 26px rgba(0,0,0,.16)}
  .btn-w:hover{transform:translateY(-2px)}
  .btn-o{background:transparent;color:#fff;border-color:rgba(255,255,255,.55)}
  .btn-o:hover{background:rgba(255,255,255,.14)}
  .p-hero-btns{display:flex;gap:13px;flex-wrap:wrap;justify-content:center}

  section{padding:82px 0}
  .sec-head{text-align:center;max-width:760px;margin:0 auto 48px}
  .sec-tag{display:inline-block;font-size:12.5px;font-weight:700;letter-spacing:.18em;color:var(--brand);text-transform:uppercase;margin-bottom:14px}
  .sec-head h2{font-size:clamp(23px,3vw,34px);font-weight:800;letter-spacing:-.02em;line-height:1.3}
  .sec-head p{color:var(--muted);margin-top:14px;font-size:16px}
  .sec-head h2 em{font-style:normal;background:linear-gradient(100deg,#176FF2,#7B5CE6);-webkit-background-clip:text;background-clip:text;color:transparent}
  .alt{background:var(--bg-soft)}

  .grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
  .grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
  .svc{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px 24px;position:relative;overflow:hidden;transition:transform .28s,box-shadow .28s,border-color .28s;box-shadow:var(--shadow-sm)}
  .svc::before{content:"";position:absolute;left:0;top:0;height:3px;width:0;background:linear-gradient(90deg,#3E9FFF,#7B5CE6);transition:width .34s ease}
  .svc:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:#d3ddf7}
  .svc:hover::before{width:100%}
  .svc-ico{width:52px;height:52px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,var(--brand-light),#f3f7ff);color:var(--brand);margin-bottom:18px;border:1px solid #dde6fc}
  .svc h3{font-size:17.5px;font-weight:700;margin-bottom:9px}
  .svc p{font-size:14.5px;color:var(--muted)}

  .pain{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
  .pain-item{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 22px;box-shadow:var(--shadow-sm)}
  .pain-item .n{font-size:13px;font-weight:800;letter-spacing:.12em;color:var(--brand);margin-bottom:12px}
  .pain-item h3{font-size:16.5px;font-weight:700;margin-bottom:8px}
  .pain-item p{font-size:14px;color:var(--muted);line-height:1.75}

  .tags{display:flex;flex-wrap:wrap;gap:12px;justify-content:center}
  .tags span{padding:10px 20px;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:14.5px;color:var(--ink-2);font-weight:500;box-shadow:var(--shadow-sm);transition:transform .2s,border-color .2s,color .2s}
  .tags span:hover{transform:translateY(-3px);border-color:var(--brand);color:var(--brand)}

  .faq{max-width:860px;margin:0 auto}
  .faq details{background:#fff;border:1px solid var(--line);border-radius:14px;margin-bottom:14px;overflow:hidden;box-shadow:var(--shadow-sm)}
  .faq summary{cursor:pointer;list-style:none;padding:20px 22px;font-weight:700;font-size:16px;display:flex;justify-content:space-between;align-items:center;gap:14px}
  .faq summary::-webkit-details-marker{display:none}
  .faq summary::after{content:"+";font-size:22px;color:var(--brand);font-weight:400;transition:transform .25s}
  .faq details[open] summary::after{transform:rotate(45deg)}
  .faq details p{padding:0 22px 20px;color:var(--muted);font-size:14.5px;margin:0}

  .cta-band{background:linear-gradient(100deg,#eaf2ff,#f2ecff 55%,#e4f6ff);color:var(--ink);padding:56px 0}
  .cta-band .wrap{display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap}
  .cta-band h3{font-size:clamp(20px,2.6vw,27px);font-weight:800;letter-spacing:-.01em}
  .cta-band p{color:var(--muted);font-size:15px;margin-top:8px}
  .cta-band .btn{background:var(--brand);color:#fff;box-shadow:0 10px 26px var(--brand-glow)}
  .cta-band .btn:hover{background:var(--brand-dark);transform:translateY(-2px)}

  footer{background:#fff;color:var(--muted);padding:60px 0 0;font-size:14px;border-top:1px solid var(--line)}
  .foot-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:40px;padding-bottom:44px}
  .foot-brand .logo{margin-bottom:18px}
  .foot-brand p{font-size:13.5px;line-height:1.8;color:var(--muted);margin-bottom:6px}
  .foot-col h4{font-size:14px;color:var(--ink);font-weight:700;margin-bottom:18px;letter-spacing:.03em}
  .foot-col li{margin-bottom:11px}
  .foot-col a{font-size:13.5px;color:var(--muted);transition:color .2s}
  .foot-col a:hover{color:var(--brand)}
  .foot-bottom{border-top:1px solid var(--line);padding:22px 0;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:12.5px;color:var(--muted);align-items:center}
  .foot-bottom a{color:var(--muted)}
  .foot-bottom a:hover{color:var(--brand)}

  .reveal{opacity:0;transform:translateY(26px);transition:opacity .7s cubic-bezier(.2,.7,.3,1),transform .7s cubic-bezier(.2,.7,.3,1)}
  .reveal.in{opacity:1;transform:none}

  @media (max-width:1024px){
    .grid3{grid-template-columns:repeat(2,1fr)}
    .grid4,.pain{grid-template-columns:repeat(2,1fr)}
    .foot-grid{grid-template-columns:1fr 1fr}
  }
  @media (max-width:768px){
    body{font-size:15.5px}
    .wrap{padding:0 18px}
    section{padding:60px 0}
    .crumb{display:none}
    .p-hero{padding:52px 0 60px}
    .grid3,.grid4,.pain,.foot-grid{grid-template-columns:1fr}
    .cta-band .wrap{flex-direction:column;align-items:flex-start}
    .cta-band .btn{width:100%}
    .foot-bottom{flex-direction:column;align-items:flex-start;text-align:left}
  }