/* Xinchuang Advertising - Shared Styles */
*{box-sizing:border-box;margin:0;padding:0}
:root{
  --ink:#0f172a;
  --ink-2:#1e293b;
  --muted:#64748b;
  --line:#e2e8f0;
  --bg:#ffffff;
  --bg-soft:#f8fafc;
  --brand:#0ea5e9;
  --brand-dark:#0369a1;
  --accent:#6366f1;
  --warn:#f59e0b;
  --ok:#10b981;
  --radius:10px;
  --max:1160px;
  --shadow-sm:0 1px 2px rgba(15,23,42,.04),0 1px 3px rgba(15,23,42,.06);
  --shadow:0 4px 6px -1px rgba(15,23,42,.08),0 2px 4px -2px rgba(15,23,42,.04);
}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",sans-serif;color:var(--ink);background:var(--bg);line-height:1.65;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:var(--brand-dark);text-decoration:none;transition:color .2s}
a:hover{color:var(--brand)}
img{max-width:100%;display:block}

/* Container */
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}

/* Nav */
.nav{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.92);backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid var(--line)}
.nav-inner{max-width:var(--max);margin:0 auto;padding:14px 20px;display:flex;align-items:center;justify-content:space-between}
.logo{display:inline-flex;align-items:center;gap:10px;font-weight:700;font-size:17px;color:var(--ink);letter-spacing:.3px;line-height:1}
.logo img{height:36px;width:auto;display:block;border-radius:6px}
.logo span{color:var(--brand)}
.nav-links{display:flex;gap:28px;align-items:center;list-style:none}
.nav-links a{color:var(--ink-2);font-size:15px;font-weight:500}
.nav-links a:hover{color:var(--brand)}
.nav-cta{padding:8px 18px;background:var(--brand);color:#fff;border-radius:6px;font-size:14px;box-shadow:var(--shadow-sm)}
.nav-cta:hover{background:var(--brand-dark);color:#fff}
.menu-btn{display:none;background:none;border:none;font-size:24px;cursor:pointer}

/* Hero */
.hero{padding:80px 20px 100px;background:linear-gradient(135deg,#0f172a 0%,#1e3a8a 55%,#0ea5e9 100%);color:#fff;text-align:center;position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 20% 50%,rgba(14,165,233,.25) 0%,transparent 50%),radial-gradient(circle at 80% 80%,rgba(99,102,241,.25) 0%,transparent 50%)}
.hero-inner{position:relative;max-width:900px;margin:0 auto}
.tag{display:inline-block;padding:6px 18px;border:1px solid rgba(255,255,255,.3);border-radius:99px;font-size:13px;margin-bottom:28px;letter-spacing:1px;background:rgba(255,255,255,.08)}
.hero h1{font-size:clamp(32px,5.5vw,58px);font-weight:700;letter-spacing:-.5px;margin-bottom:22px;line-height:1.15}
.hero .sub{font-size:clamp(16px,2.2vw,20px);opacity:.92;max-width:760px;margin:0 auto 40px;font-weight:300;line-height:1.6}
.cta-row{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;margin-bottom:56px}
.btn{display:inline-block;padding:14px 32px;border-radius:8px;font-weight:600;font-size:15px;transition:all .2s;border:none;cursor:pointer}
.btn-primary{background:#fff;color:var(--ink)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 10px 25px rgba(0,0,0,.2);color:var(--ink)}
.btn-ghost{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.4)}
.btn-ghost:hover{background:rgba(255,255,255,.1);color:#fff}

/* Stats row */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;max-width:800px;margin:0 auto}
.stat{text-align:center}
.stat .n{font-size:clamp(22px,3vw,34px);font-weight:700;color:#fff}
.stat .l{font-size:13px;opacity:.75;margin-top:4px}

/* Section */
.section{padding:80px 20px}
.section-soft{background:var(--bg-soft)}
.eyebrow{display:inline-block;color:var(--brand);font-size:13px;font-weight:600;letter-spacing:2px;text-transform:uppercase;margin-bottom:12px}
.h2{font-size:clamp(26px,3.5vw,36px);font-weight:700;color:var(--ink);line-height:1.25;margin-bottom:14px}
.lead{color:var(--muted);font-size:17px;max-width:680px}
.section-head{text-align:center;margin-bottom:50px}
.section-head .lead{margin:0 auto}

/* Service cards */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:24px}
.card{padding:28px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);transition:transform .2s, box-shadow .2s;box-shadow:var(--shadow-sm)}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.card .icon{width:44px;height:44px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--brand),var(--accent));color:#fff;border-radius:10px;font-size:20px;font-weight:700;margin-bottom:18px}
.card h3{font-size:18px;margin-bottom:10px;color:var(--ink)}
.card p{color:var(--muted);font-size:14.5px}

/* Why choose */
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.grid-2 .h2{margin-bottom:18px}
.check-list{list-style:none}
.check-list li{padding:12px 0 12px 32px;position:relative;color:var(--ink-2);border-bottom:1px solid var(--line)}
.check-list li:last-child{border-bottom:0}
.check-list li::before{content:"✓";position:absolute;left:0;top:12px;width:22px;height:22px;display:flex;align-items:center;justify-content:center;background:var(--ok);color:#fff;border-radius:50%;font-size:13px;font-weight:700}
.check-list strong{color:var(--ink)}

/* Case */
.case-box{background:linear-gradient(135deg,#f8fafc,#ffffff);border:1px solid var(--line);border-radius:14px;padding:40px;position:relative}
.case-box::before{content:"CASE STUDY";position:absolute;top:-10px;left:40px;background:var(--brand);color:#fff;padding:4px 14px;font-size:11px;letter-spacing:2px;font-weight:600;border-radius:4px}
.case-metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:24px}
.case-metric{text-align:center;padding:18px;background:#fff;border:1px solid var(--line);border-radius:8px}
.case-metric .big{font-size:28px;font-weight:700;color:var(--brand);display:block}
.case-metric .sub{font-size:13px;color:var(--muted);margin-top:4px}

/* Platform logos */
.platforms{display:flex;gap:24px;flex-wrap:wrap;justify-content:center;align-items:center;margin-top:36px}
.platforms .p{padding:10px 22px;background:#fff;border:1px solid var(--line);border-radius:8px;color:var(--ink-2);font-size:14px;font-weight:500}

/* Content page */
.content{padding:60px 20px 100px}
.content .wrap{max-width:760px}
.content h1{font-size:clamp(26px,4vw,40px);font-weight:700;margin-bottom:12px;line-height:1.25}
.content .meta{color:var(--muted);font-size:14px;margin-bottom:32px}
.content h2{font-size:24px;margin:40px 0 14px;font-weight:700;color:var(--ink)}
.content h3{font-size:19px;margin:30px 0 10px;font-weight:600;color:var(--ink)}
.content p{margin-bottom:16px;color:var(--ink-2)}
.content ul,.content ol{margin:0 0 18px 22px;color:var(--ink-2)}
.content li{margin-bottom:6px}
.content blockquote{border-left:3px solid var(--brand);padding:8px 18px;margin:18px 0;color:var(--muted);background:var(--bg-soft);border-radius:0 6px 6px 0}
.content table{width:100%;border-collapse:collapse;margin:18px 0;font-size:14.5px}
.content th,.content td{border:1px solid var(--line);padding:10px 12px;text-align:left}
.content th{background:var(--bg-soft);font-weight:600}
.content code{background:#f1f5f9;padding:2px 6px;border-radius:4px;font-size:14px}
.content hr{border:0;border-top:1px solid var(--line);margin:30px 0}

/* Blog list */
.post-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:22px}
.post{padding:24px;border:1px solid var(--line);border-radius:var(--radius);background:#fff;transition:transform .2s,box-shadow .2s}
.post:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.post .tag-small{display:inline-block;font-size:11px;font-weight:600;letter-spacing:1px;color:var(--brand);margin-bottom:10px;text-transform:uppercase}
.post h3{font-size:18px;margin-bottom:10px;line-height:1.4}
.post h3 a{color:var(--ink)}
.post h3 a:hover{color:var(--brand)}
.post .excerpt{color:var(--muted);font-size:14.5px;margin-bottom:14px}
.post .read{font-size:13px;font-weight:600;color:var(--brand)}

/* FAQ */
.faq{max-width:760px;margin:0 auto}
.faq-item{border-bottom:1px solid var(--line);padding:18px 0}
.faq-item:first-child{border-top:1px solid var(--line)}
.faq-item summary{font-weight:600;cursor:pointer;padding:4px 0;font-size:16px;list-style:none;position:relative;padding-right:30px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";position:absolute;right:0;top:4px;font-size:20px;color:var(--brand);font-weight:300}
.faq-item[open] summary::after{content:"−"}
.faq-item p{padding-top:12px;color:var(--muted);font-size:15px;line-height:1.7}

/* Contact */
.contact-grid{display:grid;grid-template-columns:1.3fr 1fr;gap:50px}
.info-row{padding:18px 0;border-bottom:1px solid var(--line);display:flex;gap:18px;align-items:flex-start}
.info-row:last-child{border-bottom:0}
.info-label{width:90px;color:var(--muted);font-size:14px;flex-shrink:0;padding-top:2px}
.info-val{color:var(--ink);font-weight:500}

/* CTA banner */
.cta-banner{background:linear-gradient(135deg,var(--brand),var(--accent));color:#fff;padding:60px 20px;text-align:center;border-radius:14px;margin:40px auto;max-width:var(--max)}
.cta-banner h2{font-size:28px;margin-bottom:12px}
.cta-banner p{opacity:.9;margin-bottom:24px;max-width:600px;margin-left:auto;margin-right:auto}

/* Footer */
footer{background:#0a0f1e;color:#94a3b8;padding:50px 20px 24px;font-size:14px;margin-top:40px}
.foot-grid{max-width:var(--max);margin:0 auto;display:grid;grid-template-columns:1.5fr repeat(3,1fr);gap:32px;margin-bottom:30px}
.foot-col h4{color:#fff;font-size:14px;margin-bottom:14px;letter-spacing:.5px;font-weight:600}
.foot-col a{display:block;color:#94a3b8;padding:4px 0;font-size:13.5px}
.foot-col a:hover{color:#fff}
.foot-brand{color:#fff;font-weight:700;font-size:17px;margin-bottom:14px;display:flex;align-items:center;gap:10px}
.foot-brand img{height:40px;width:auto;border-radius:6px}
.foot-brand span{color:var(--brand)}
.foot-desc{color:#94a3b8;font-size:13px;line-height:1.7;margin-bottom:14px}
.foot-bottom{max-width:var(--max);margin:0 auto;border-top:1px solid #1e293b;padding-top:20px;text-align:center;font-size:12.5px;color:#64748b}
.foot-bottom a{color:#64748b}
.foot-bottom a:hover{color:#94a3b8}

/* Responsive */
@media(max-width:900px){
  .grid-2{grid-template-columns:1fr;gap:30px}
  .contact-grid{grid-template-columns:1fr;gap:30px}
  .stats{grid-template-columns:repeat(2,1fr)}
  .foot-grid{grid-template-columns:1fr 1fr;gap:24px}
  .case-metrics{grid-template-columns:1fr}
}
@media(max-width:640px){
  .nav-links{display:none;position:absolute;top:100%;left:0;right:0;background:#fff;flex-direction:column;gap:0;padding:10px 0;border-bottom:1px solid var(--line)}
  .nav-links.open{display:flex}
  .nav-links a,.nav-links li{width:100%;padding:12px 20px;border-bottom:1px solid var(--line)}
  .menu-btn{display:block}
  .section{padding:50px 20px}
  .hero{padding:60px 20px 70px}
  .content{padding:40px 20px 70px}
}