:root{
  /* Logo 金色版：深藏蓝底 + Logo 金强调 */
  --navy:#0c1d33;
  --navy-2:#0a1726;
  --navy-deep:#06101c;
  --gold:#f6d63b;
  --gold-2:#d9b720;
  --ink:#1f2a37;
  --muted:#5f6b7a;
  --line:#e3e8ef;
  --bg:#ffffff;
  --bg-2:#f5f7fa;
  --bg-3:#eef2f7;
  --radius:10px;
  --shadow:0 8px 30px rgba(10,23,38,.10);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);line-height:1.75;background:var(--bg);-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.container{max-width:1160px;margin:0 auto;padding:0 22px}
h1,h2,h3{color:var(--navy);line-height:1.3;font-weight:700}
section{padding:72px 0}

/* Header */
header.site{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:66px}
.brand{display:flex;align-items:center;gap:10px}
.brand a{display:flex;align-items:center}
.brand .logo-img{height:42px;width:auto;display:block}
.brand .name{font-size:21px;font-weight:800;color:var(--navy);letter-spacing:1px}
.brand .sub{font-size:12px;color:var(--gold-2);font-weight:600;letter-spacing:2px}
.nav ul{display:flex;gap:28px;list-style:none;margin:0;padding:0}
.nav a{color:var(--ink);font-size:15px;font-weight:500;transition:color .2s;position:relative}
.nav a:hover,.nav a.active{color:var(--gold-2)}
.menu-btn{display:none;background:none;border:0;font-size:24px;color:var(--navy);cursor:pointer}

/* 普华永道式下拉菜单 */
.nav li.has-drop{position:relative}
.nav li.has-drop > a::after{content:"\25BE";font-size:10px;margin-left:5px;color:var(--muted)}
.nav .drop{position:absolute;top:100%;left:0;min-width:190px;background:#fff;border:1px solid var(--line);border-top:2px solid var(--gold);border-radius:0 0 10px 10px;box-shadow:var(--shadow);padding:8px 0;opacity:0;visibility:hidden;transform:translateY(6px);transition:.18s;z-index:60}
.nav li.has-drop:hover .drop{opacity:1;visibility:visible;transform:translateY(0)}
.nav .drop li{list-style:none}
.nav .drop a{display:block;padding:10px 18px;color:var(--ink);font-size:14.5px;white-space:nowrap;font-weight:500}
.nav .drop a:hover{background:var(--bg-2);color:var(--gold-2)}

/* Buttons */
.btn{display:inline-block;padding:12px 26px;border-radius:8px;font-weight:600;font-size:15px;transition:.2s;cursor:pointer}
.btn-gold{background:var(--gold);color:var(--navy-deep)}
.btn-gold:hover{background:var(--gold-2)}
.btn-outline{border:1px solid var(--navy);color:var(--navy)}
.btn-outline:hover{background:var(--navy);color:#fff}
.btn-light{border:1px solid rgba(255,255,255,.5);color:#fff}
.btn-light:hover{background:rgba(255,255,255,.12)}

/* Hero */
.hero{background:linear-gradient(135deg,var(--navy-deep),var(--navy-2));color:#fff;padding:108px 0 96px}
.hero .tag{display:inline-block;color:var(--gold);border:1px solid rgba(246,214,59,.45);padding:5px 14px;border-radius:30px;font-size:13px;letter-spacing:1px;margin-bottom:22px}
.hero h1{color:#fff;font-size:48px;font-weight:800;margin:0 0 18px;letter-spacing:1px}
.hero .hero-slogan{font-size:22px;font-weight:700;color:var(--gold);line-height:1.55;max-width:780px;margin:0 0 20px;letter-spacing:.3px}
.hero p.lead{font-size:18px;color:#cdd8e6;max-width:640px;margin:0 0 32px}
.hero .actions{display:flex;gap:14px;flex-wrap:wrap}
.hero .stats{display:flex;gap:40px;margin-top:54px;flex-wrap:wrap}
.hero .stats .num{font-size:30px;font-weight:800;color:var(--gold)}
.hero .stats .lab{font-size:13px;color:#aebccd}

/* Section heading */
.sec-head{text-align:center;max-width:720px;margin:0 auto 48px}
.sec-head .ey{color:var(--gold-2);font-weight:700;letter-spacing:3px;font-size:13px}
.sec-head h2{font-size:34px;margin:10px 0 12px;font-weight:800}
.sec-head h2::after{content:"";display:block;width:46px;height:3px;background:var(--gold);margin:16px auto 0;border-radius:2px}
.sec-head p{color:var(--muted);font-size:16px;margin:0}

/* Cards grid */
.grid{display:grid;gap:22px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px 26px;transition:.2s}
.card:hover{box-shadow:var(--shadow);transform:translateY(-3px);border-color:var(--gold)}
.card .ic{width:46px;height:46px;border-radius:10px;background:var(--bg-3);color:var(--navy);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:18px;margin-bottom:16px}
.card h3{font-size:19px;margin:0 0 10px}
.card p{color:var(--muted);font-size:14.5px;margin:0}

/* Service list */
.svc{border-left:3px solid var(--gold);padding:6px 0 6px 22px;margin-bottom:26px}
.svc h3{font-size:20px;margin:0 0 8px;color:var(--navy)}
.svc p{color:var(--muted);margin:0;font-size:15px}

/* Clients */
.clients{background:var(--bg-2)}
.client-wall{display:flex;flex-wrap:wrap;gap:14px;justify-content:center}
.client-wall span{background:#fff;border:1px solid var(--line);border-radius:8px;padding:10px 18px;font-size:14.5px;color:var(--ink);font-weight:500}

/* 可折叠客户名单 */
.clients-fold{text-align:center}
.clients-fold>summary{cursor:pointer;display:inline-flex;align-items:center;gap:10px;background:#fff;border:1px solid var(--line);border-radius:8px;padding:12px 26px;font-size:15px;font-weight:600;color:var(--navy);list-style:none;transition:.2s}
.clients-fold>summary::-webkit-details-marker{display:none}
.clients-fold>summary:hover{border-color:var(--gold);box-shadow:var(--shadow)}
.clients-fold>summary::after{content:"\25BE";font-size:12px;color:var(--gold-2)}
.clients-fold[open]>summary::after{content:"\25B4"}
.clients-fold[open]>summary{margin-bottom:30px}

/* Intro video */
.intro-video{background:#fff}
.video-wrap{max-width:860px;margin:0 auto}
.video-wrap video{width:100%;border-radius:var(--radius);box-shadow:var(--shadow);display:block;background:#000}

/* Team */
.member{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px}
.member h3{font-size:17px;margin:0 0 4px}
.member .role{color:var(--gold-2);font-size:13px;font-weight:600;margin:0 0 8px}
.member p{color:var(--muted);font-size:13.5px;margin:0}

/* Insights */
.post{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px 26px;display:flex;flex-direction:column;gap:8px}
.post .date{color:var(--gold-2);font-size:13px;font-weight:600}
.post h3{font-size:18px;margin:0}
.post p{color:var(--muted);font-size:14.5px;margin:0;flex:1}
.post a.more{color:var(--navy);font-weight:600;font-size:14px}
.post a.more:hover{color:var(--gold-2)}

/* FAQ */
.faq{background:var(--bg-2)}
details.faq-item{background:#fff;border:1px solid var(--line);border-radius:10px;padding:18px 22px;margin-bottom:14px}
details.faq-item summary{cursor:pointer;font-weight:600;color:var(--navy);font-size:16px;list-style:none}
details.faq-item summary::-webkit-details-marker{display:none}
details.faq-item summary::before{content:"+";color:var(--gold-2);font-weight:800;margin-right:10px}
details.faq-item[open] summary::before{content:"\2212"}
details.faq-item .ans{color:var(--muted);font-size:14.5px;margin-top:12px}

/* CTA band */
.cta{background:linear-gradient(135deg,var(--navy),var(--navy-2));color:#fff;text-align:center}
.cta h2{color:#fff;font-size:28px;margin:0 0 14px}
.cta p{color:#cdd8e6;margin:0 0 26px;font-size:16px}

/* Contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:30px}
.info-row{display:flex;gap:14px;margin-bottom:20px;align-items:flex-start}
.info-row .k{color:var(--gold-2);font-weight:700;min-width:64px}
.info-row .v{color:var(--ink);font-size:15px}
.contact-box{background:var(--bg-2);border:1px solid var(--line);border-radius:var(--radius);padding:30px}

/* Footer */
footer.site{background:var(--navy-deep);color:#9fb0c4;padding:46px 0 30px;font-size:14px}
footer.site .f-top{display:flex;justify-content:space-between;flex-wrap:wrap;gap:30px;margin-bottom:26px}
footer.site .f-brand .name{color:#fff;font-size:19px;font-weight:800}
footer.site .f-brand .sub{color:var(--gold);font-size:12px;letter-spacing:2px}
footer.site a{color:#9fb0c4}
footer.site a:hover{color:var(--gold)}
footer.site .f-links{display:flex;gap:40px;flex-wrap:wrap}
footer.site .f-links h4{color:#fff;font-size:14px;margin:0 0 12px}
footer.site .f-links ul{list-style:none;margin:0;padding:0;line-height:2}
footer.site .copy{border-top:1px solid rgba(255,255,255,.1);padding-top:18px;color:#6f8198;font-size:13px}

/* About intro band */
.intro-band{background:var(--bg-2)}
.intro-band .lead{font-size:17px;color:var(--ink);max-width:860px}
.value-list{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:30px}
.value-list .v{border-top:3px solid var(--gold);background:#fff;padding:22px;border-radius:0 0 10px 10px}
.value-list .v h4{margin:0 0 8px;color:var(--navy);font-size:17px}
.value-list .v p{margin:0;color:var(--muted);font-size:14px}

/* Responsive */
@media(max-width:900px){
  .grid-3{grid-template-columns:1fr 1fr}
  .value-list{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
}
@media(max-width:680px){
  .nav ul{display:none;position:absolute;top:66px;left:0;right:0;background:#fff;flex-direction:column;padding:14px 22px;gap:14px;border-bottom:1px solid var(--line);box-shadow:var(--shadow)}
  .nav ul.open{display:flex}
  .menu-btn{display:block}
  .grid-3,.grid-2{grid-template-columns:1fr}
  .hero h1{font-size:30px}
  .hero .hero-slogan{font-size:17px;line-height:1.5;margin-bottom:16px}
  .hero .stats{gap:24px}
  section{padding:54px 0}
  .nav li.has-drop{position:static}
  .nav li.has-drop > a::after{content:""}
  .nav .drop{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;border:0;border-top:1px solid var(--line);border-radius:0;padding:4px 0 6px 16px;min-width:0}
  .nav .drop a{padding:9px 14px;font-size:14px}
}

/* ===== 在线顾问机器人 ===== */
.bot-fab{position:fixed;right:22px;bottom:22px;z-index:90;display:flex;align-items:center;gap:8px;background:var(--gold);color:var(--navy-deep);padding:12px 18px;border-radius:30px;box-shadow:0 8px 24px rgba(217,183,32,.35);cursor:pointer;font-weight:600;font-size:15px;transition:.2s}
.bot-fab:hover{background:var(--gold-2)}
.bot-fab-ico{font-size:18px}
.bot-panel{position:fixed;right:22px;bottom:22px;z-index:91;width:360px;max-width:calc(100vw - 28px);height:520px;max-height:calc(100vh - 44px);background:#fff;border-radius:16px;box-shadow:0 16px 50px rgba(10,23,38,.28);display:none;flex-direction:column;overflow:hidden;border:1px solid var(--line)}
.bot-panel.open{display:flex}
.bot-head{display:flex;align-items:center;gap:10px;padding:14px 16px;background:linear-gradient(135deg,var(--navy-deep),var(--navy-2));color:#fff}
.bot-head-ava{width:38px;height:38px;border-radius:50%;background:#fff;overflow:hidden;flex-shrink:0}
.bot-head-ava img{width:100%;height:100%;display:block}
.bot-head-txt{display:flex;flex-direction:column;line-height:1.3;flex:1}
.bot-head-txt strong{font-size:15px}
.bot-head-txt span{font-size:12px;color:#aebccd}
.bot-close{background:none;border:0;color:#fff;font-size:24px;cursor:pointer;line-height:1;padding:0 2px}
.bot-msgs{flex:1;overflow-y:auto;padding:16px;background:var(--bg-2);display:flex;flex-direction:column;gap:10px}
.bot-msg{max-width:86%;padding:10px 13px;border-radius:12px;font-size:14px;line-height:1.6;word-break:break-word}
.bot-bot{background:#fff;color:var(--ink);align-self:flex-start;border:1px solid var(--line)}
.bot-user{background:var(--gold);color:var(--navy-deep);align-self:flex-end;border-bottom-right-radius:3px}
.bot-bot a{color:var(--gold-2);font-weight:600}
.bot-chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:2px}
.bot-chip{background:#fff;border:1px solid var(--gold);color:var(--gold-2);border-radius:18px;padding:7px 12px;font-size:13px;cursor:pointer;font-family:inherit;transition:.15s}
.bot-chip:hover{background:var(--gold);color:var(--navy-deep)}
.bot-input{display:flex;gap:8px;padding:12px;border-top:1px solid var(--line);background:#fff}
.bot-input input{flex:1;border:1px solid var(--line);border-radius:8px;padding:10px 12px;font-size:14px;font-family:inherit;outline:none}
.bot-input input:focus{border-color:var(--gold)}
.bot-send{background:var(--gold);color:var(--navy-deep);border:0;border-radius:8px;padding:0 18px;font-weight:600;cursor:pointer;font-family:inherit}
.bot-send:hover{background:var(--gold-2)}
@media(max-width:680px){
  .bot-panel{right:14px;bottom:14px;left:14px;width:auto}
  .bot-fab{right:14px;bottom:14px}
}