/* ============================================================
   利云聚集科技官网 - 公共样式（6 个前台页面共享）
   包含：基础变量/Reset、按钮、顶栏、头部导航、页脚、回到顶部、
        滚动显现动画、通用小节标题等。
   修改头部/页脚/回到顶部等公共样式只改本文件，勿再逐页修改。
   各页面专属样式仍在页面 <style> 内。
   ============================================================ */

:root{
  --primary:#1b4b8f;--primary-dark:#163a70;--primary-light:#2e6bc6;
  --navy:#0a1d3a;--navy-2:#10294f;--ink:#1e293b;--ink-2:#3b4a5f;--muted:#64748b;
  --line:#dfe6ee;--bg:#ffffff;--bg-soft:#f4f7fb;--bg-tint:#e8eff9;--accent:#ea580c;
  --radius:12px;--radius-lg:18px;
  --shadow-md:0 6px 24px rgba(16,24,40,.08);--shadow-lg:0 20px 48px rgba(10,29,58,.18);
  --container:1200px;
  --font:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Noto Sans SC","Source Han Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.75;font-size:16px;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
ul{list-style:none}
button{font-family:inherit;cursor:pointer;border:none;background:none}
.container{max-width:var(--container);margin:0 auto;padding:0 24px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 32px;border-radius:8px;font-size:16px;font-weight:600;transition:transform .2s,box-shadow .2s,background .2s,color .2s;white-space:nowrap}
.btn-primary{background:var(--primary);color:#fff;box-shadow:0 8px 20px rgba(27,75,143,.3)}
.btn-primary:hover{background:var(--primary-dark);transform:translateY(-2px)}
.btn-sm{padding:9px 22px;font-size:14px;border-radius:7px}
.sec-eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:14px;font-weight:600;letter-spacing:.18em;color:var(--primary);margin-bottom:14px}
.sec-eyebrow::before{content:"";width:22px;height:2px;background:var(--accent)}
.topbar{background:var(--navy);color:#d6cec4;font-size:13px;position:relative;z-index:102}
.topbar .container{display:flex;justify-content:space-between;align-items:center;height:36px}
.topbar .hotline{display:inline-flex;align-items:center;gap:6px;font-weight:600;color:#fff}
.topbar .hotline b{color:#fbbf24}
.header{position:sticky;top:0;z-index:101;background:rgba(255,255,255,.94);backdrop-filter:blur(12px);border-bottom:1px solid transparent;transition:box-shadow .25s,border-color .25s}
.header.scrolled{box-shadow:var(--shadow-md);border-color:var(--line)}
.header .container{display:flex;align-items:center;justify-content:space-between;height:76px;gap:24px}
.logo{display:flex;align-items:center;gap:11px;font-size:21px;font-weight:800}
.logo-mark{width:40px;height:40px;border-radius:9px;background:var(--primary);display:grid;place-items:center;flex:none}
.logo b{color:var(--primary)}
.logo .logo-img{height:40px;width:auto;display:block}
.footer .logo .logo-img{height:36px}
.nav ul{display:flex;gap:2px}
.nav a{display:block;padding:10px 13px;border-radius:7px;font-size:15px;font-weight:500;color:var(--ink-2);transition:color .2s,background .2s}
.nav a:hover{color:var(--primary);background:var(--bg-tint)}
.nav a.active{color:var(--primary);background:var(--bg-tint);font-weight:600}
.has-drop{position:relative}
.nav .caret-ic{width:12px;height:12px;margin-left:4px;transition:transform .25s;vertical-align:-1px}
.has-drop:hover .caret-ic,.has-drop:focus-within .caret-ic{transform:rotate(180deg)}
.has-drop:hover .dropdown,.has-drop:focus-within .dropdown{opacity:1;visibility:visible;transform:translate(-50%,0)}
.dropdown::before{content:"";position:absolute;top:-6px;left:0;right:0;height:6px}
.dropdown a{display:block;padding:10px 16px;border-radius:8px;font-size:14.5px;white-space:nowrap}
.dropdown a:hover{background:var(--bg-tint)}
.header-actions{display:flex;align-items:center;gap:22px}
.header-phone{display:flex;align-items:center;gap:9px;line-height:1.3}
.header-phone svg{color:var(--accent)}
.header-phone .label{display:block;font-size:11.5px;color:var(--muted)}
.header-phone .num{font-size:18px;font-weight:800;color:var(--accent);letter-spacing:.02em}
.nav-toggle{display:none;width:44px;height:44px;border-radius:9px;flex-direction:column;justify-content:center;align-items:center;gap:5px}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--ink);border-radius:2px;transition:transform .25s,opacity .25s}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
#neuralNet{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;z-index:1}
@keyframes orbDrift{0%,100%{transform:translate(0,0)}33%{transform:translate(46px,-34px)}66%{transform:translate(-34px,40px)}}
@media (prefers-reduced-motion:reduce){.hero-orb{animation:none}}
@keyframes heroIn{from{opacity:0;transform:translateY(26px);filter:blur(6px)}to{opacity:1;transform:none;filter:blur(0)}}
.footer{background:var(--navy);color:#8ba3c4;font-size:14px}
.footer-main{display:grid;grid-template-columns:1.5fr .85fr .85fr 1.15fr 1.05fr;gap:44px;padding:60px 0 46px}
.footer .logo{color:#fff;margin-bottom:16px}
.footer-about p{line-height:1.8;font-size:13.5px}
.footer h4{color:#fff;font-size:16px;margin-bottom:16px;font-weight:600}
.footer-links li{margin-bottom:10px}
.footer-links a:hover{color:#fff}
.footer-contact li{display:flex;gap:10px;margin-bottom:13px;line-height:1.6}
.footer-contact svg{flex:none;margin-top:4px;color:#fb923c}
.footer-qr{display:flex;flex-direction:column;align-items:flex-start;gap:12px}
.footer-qr img{width:94px;height:94px;border-radius:12px;background:#fff;padding:6px;flex:none;box-shadow:0 0 0 1px rgba(255,255,255,.15);transition:transform .25s}
.footer-qr:hover img{transform:scale(1.05)}
.footer-qr b{display:block;color:#fff;font-size:14.5px}
.footer-qr span{display:block;font-size:12.5px;color:#8ba3c4;line-height:1.7}
@media (max-width:1300px){.footer-main{grid-template-columns:repeat(2,1fr)}}
.lz-ic{display:inline-block;width:15px;height:auto;vertical-align:-3px}
.beian-ic{display:inline-block;width:14px;height:14px;vertical-align:-2px;margin-right:5px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:20px 0;display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;font-size:13px;color:#7e93b5}
.to-top{position:fixed;right:26px;bottom:100px;width:48px;height:48px;border-radius:50%;background:var(--primary);color:#fff;display:grid;place-items:center;box-shadow:0 10px 24px rgba(27,75,143,.4);opacity:0;visibility:hidden;transform:translateY(14px);transition:all .3s;z-index:90}
.to-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{background:var(--primary-dark)}
.reveal{opacity:0;transform:translateY(32px);filter:blur(8px);transition:opacity .9s cubic-bezier(.22,.61,.36,1),transform .9s cubic-bezier(.22,.61,.36,1),filter .9s cubic-bezier(.22,.61,.36,1)}
.reveal.visible{opacity:1;transform:none;filter:blur(0)}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}.reveal{transition:none}}
.btn-primary{position:relative;overflow:hidden}
@keyframes btnShine{0%,55%{left:-80%}100%{left:170%}}
@media (prefers-reduced-motion:reduce){.btn-primary::after{display:none}}

@media (max-width:1080px){
    .footer-main{grid-template-columns:1fr 1fr}
}

@media (max-width:768px){
    .topbar .welcome{display:none}
    .nav{position:fixed;inset:112px 0 auto 0;background:#fff;box-shadow:var(--shadow-lg);max-height:0;overflow:hidden;transition:max-height .35s;z-index:100}
    .nav.open{max-height:640px;border-bottom:1px solid var(--line)}
    .nav ul{flex-direction:column;gap:2px;padding:12px 20px 18px}
    .nav a{padding:13px 14px;font-size:16px}
    .dropdown{position:static;transform:none;opacity:1;visibility:visible;box-shadow:none;border:none;border-radius:0;padding:0 0 0 20px;min-width:0;background:transparent}
    .dropdown a{font-size:15px;padding:9px 14px;color:var(--ink-2)}
    .nav .caret-ic{display:none}
    .nav-toggle{display:flex}
    .header-phone,.header .btn{display:none}
    .footer-main{grid-template-columns:1fr;gap:30px;padding:46px 0 34px}
    .footer-qr{display:flex;flex-direction:column;align-items:flex-start;gap:12px}
  .footer-bottom{flex-direction:column;align-items:center;text-align:center}
    .to-top{right:16px;bottom:20px}
}