/* ===== Base ===== */
:root{
  --bg-dark:#0A0E27;
  --bg-darker:#060819;
  --accent-cyan:#00E5FF;
  --accent-blue:#3D5AFE;
  --accent-purple:#9C27FF;
  --text-light:#EAF0FF;
  --text-muted:#9AA5C4;
  --gradient:linear-gradient(135deg,var(--accent-cyan),var(--accent-blue) 55%,var(--accent-purple));
  --radius:14px;
  --transition:.35s cubic-bezier(.4,0,.2,1);
}
*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{
  font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  background:#05060f;
  color:var(--text-light);
  line-height:1.6;
  overflow-x:hidden;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
ul{list-style:none;}
.container{width:min(1180px,92%);margin:0 auto;}

/* ===== Buttons ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:14px 32px;border-radius:50px;font-size:15px;font-weight:600;
  transition:var(--transition);cursor:pointer;border:1px solid transparent;
}
.btn-primary{
  background:var(--gradient);color:#04101f;
  box-shadow:0 8px 24px rgba(61,90,254,.35);
}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 14px 32px rgba(61,90,254,.5);}
.btn-outline{border-color:rgba(234,240,255,.35);color:var(--text-light);}
.btn-outline:hover{background:rgba(234,240,255,.08);border-color:var(--accent-cyan);}
.btn-block{width:100%;}

/* ===== Header ===== */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:1000;
  padding:18px 0;transition:var(--transition);
  background:transparent;
}
.site-header.scrolled{
  background:rgba(6,8,25,.85);backdrop-filter:blur(14px);
  padding:12px 0;box-shadow:0 4px 24px rgba(0,0,0,.35);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;}
.brand{display:flex;align-items:center;gap:10px;}
.brand-logo{width:38px;height:38px;}
.brand-text{display:flex;flex-direction:column;line-height:1.1;}
.brand-text strong{font-size:16px;letter-spacing:.5px;background:var(--gradient);-webkit-background-clip:text;background-clip:text;color:transparent;}
.brand-text small{font-size:11px;color:var(--text-muted);letter-spacing:2px;}
.main-nav{display:flex;gap:36px;}
.nav-link{position:relative;font-size:14.5px;color:var(--text-muted);padding:6px 0;transition:var(--transition);}
.nav-link:hover,.nav-link.active{color:var(--text-light);}
.nav-link::after{
  content:"";position:absolute;left:0;bottom:0;height:2px;width:0;
  background:var(--gradient);transition:var(--transition);
}
.nav-link:hover::after,.nav-link.active::after{width:100%;}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:6px;}
.nav-toggle span{width:24px;height:2px;background:var(--text-light);border-radius:2px;}

/* ===== Hero ===== */
.hero{
  position:relative;min-height:100vh;display:flex;align-items:center;
  overflow:hidden;
}
.hero-bg{
  position:absolute;inset:0;background-size:cover;background-position:center;
  transform:scale(1.08);filter:saturate(1.1) brightness(.65);
}
.hero-overlay{
  position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(5,6,15,.55) 0%,rgba(5,6,15,.75) 55%,#05060f 100%),
             radial-gradient(circle at 20% 30%,rgba(0,229,255,.18),transparent 45%),
             radial-gradient(circle at 80% 70%,rgba(156,39,255,.18),transparent 45%);
}
.hero-particles{position:absolute;inset:0;pointer-events:none;}
.hero-particles span{
  position:absolute;border-radius:50%;background:var(--accent-cyan);
  opacity:.5;animation:floatUp linear infinite;
}
@keyframes floatUp{
  0%{transform:translateY(0) translateX(0);opacity:0;}
  10%{opacity:.6;}
  90%{opacity:.4;}
  100%{transform:translateY(-100vh) translateX(20px);opacity:0;}
}
.hero-content{position:relative;z-index:2;text-align:center;margin:0 auto;padding-top:70px;}
.hero-eyebrow{
  color:var(--accent-cyan);letter-spacing:6px;font-size:13px;font-weight:600;margin-bottom:18px;
}
.hero-title{
  font-size:clamp(34px,6vw,64px);font-weight:800;letter-spacing:1px;margin-bottom:22px;
}
.hero-title .accent{
  background:var(--gradient);-webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-subtitle{
  color:var(--text-muted);font-size:clamp(14px,1.8vw,18px);max-width:680px;margin:0 auto 40px;
}
.hero-actions{display:flex;gap:20px;justify-content:center;flex-wrap:wrap;}
.scroll-down{
  position:absolute;bottom:34px;left:50%;transform:translateX(-50%);
  width:26px;height:44px;border:2px solid rgba(234,240,255,.4);border-radius:20px;z-index:2;
}
.scroll-down span{
  position:absolute;top:8px;left:50%;transform:translateX(-50%);
  width:4px;height:8px;background:var(--accent-cyan);border-radius:2px;
  animation:scrollDown 1.6s infinite;
}
@keyframes scrollDown{
  0%{opacity:1;top:8px;}
  70%{opacity:0;top:24px;}
  100%{opacity:0;top:24px;}
}

/* ===== Section generic ===== */
.section{padding:110px 0;position:relative;}
.section-eyebrow{
  color:var(--accent-cyan);letter-spacing:4px;font-size:12.5px;font-weight:700;margin-bottom:14px;
}
.section-title{font-size:clamp(26px,3.6vw,38px);font-weight:800;margin-bottom:18px;}
.section-desc{color:var(--text-muted);font-size:15.5px;margin-bottom:16px;}
.section-desc-center{color:var(--text-muted);font-size:15.5px;max-width:600px;margin:0 auto;}
.section-head{text-align:center;max-width:720px;margin:0 auto 60px;}
.section-head.light{color:#fff;}
.section-head.light .section-title{color:#fff;}

/* reveal animation */
[data-reveal]{opacity:0;transform:translateY(36px);transition:opacity .8s ease,transform .8s ease;}
[data-reveal].in-view{opacity:1;transform:translateY(0);}

/* ===== About ===== */
.about-section{background:linear-gradient(180deg,#05060f,#0A0E27 60%,#05060f);}
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:70px;align-items:center;}
.about-media{position:relative;border-radius:var(--radius);overflow:hidden;}
.about-media img{border-radius:var(--radius);aspect-ratio:4/3.2;object-fit:cover;}
.about-media-badge{
  position:absolute;bottom:-24px;right:-24px;background:var(--gradient);
  border-radius:16px;padding:20px 26px;text-align:center;box-shadow:0 12px 30px rgba(61,90,254,.4);
}
.badge-num{display:block;font-size:26px;font-weight:800;color:#04101f;}
.badge-label{font-size:12px;color:#04101f;font-weight:600;}
.about-stats{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin-top:34px;}
.stat-num{font-size:30px;font-weight:800;background:var(--gradient);-webkit-background-clip:text;background-clip:text;color:transparent;}
.stat-label{display:block;font-size:13px;color:var(--text-muted);margin-top:4px;}

/* ===== Business ===== */
.business-section{background:#05060f;}
.business-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px;}
.business-card{
  background:rgba(255,255,255,.03);border:1px solid rgba(255,255,255,.06);
  border-radius:var(--radius);overflow:hidden;transition:var(--transition);
}
.business-card:hover{transform:translateY(-8px);border-color:rgba(0,229,255,.4);box-shadow:0 16px 40px rgba(0,0,0,.4);}
.card-img{height:170px;background-size:cover;background-position:center;position:relative;}
.card-img::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(5,6,15,0),rgba(5,6,15,.9));}
.card-body{padding:26px 24px 30px;}
.card-icon{font-size:26px;margin-bottom:12px;}
.card-body h3{font-size:18px;margin-bottom:10px;}
.card-body p{color:var(--text-muted);font-size:14px;}

/* ===== Advantage ===== */
.advantage-section{position:relative;color:#fff;overflow:hidden;}
.advantage-bg{position:absolute;inset:0;background-size:cover;background-position:center;transform:scale(1.05);}
.advantage-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(5,6,15,.92),rgba(10,14,39,.88));}
.advantage-section .container{position:relative;z-index:1;}
.advantage-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:26px;}
.advantage-item{
  text-align:center;padding:36px 20px;border-radius:var(--radius);
  background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);
  transition:var(--transition);
}
.advantage-item:hover{background:rgba(255,255,255,.08);transform:translateY(-6px);}
.adv-icon{font-size:32px;margin-bottom:16px;}
.advantage-item h3{font-size:17px;margin-bottom:10px;}
.advantage-item p{color:var(--text-muted);font-size:13.5px;}

/* ===== Contact ===== */
.contact-section{background:linear-gradient(180deg,#05060f,#0A0E27);}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:70px;}
.contact-list{margin-top:30px;display:flex;flex-direction:column;gap:24px;}
.contact-list li{display:flex;gap:16px;align-items:flex-start;}
.contact-icon{
  width:44px;height:44px;flex:none;border-radius:50%;
  background:rgba(0,229,255,.1);display:flex;align-items:center;justify-content:center;font-size:18px;
}
.contact-list strong{font-size:14.5px;}
.contact-list p{color:var(--text-muted);font-size:14px;margin-top:2px;}
.contact-list a:hover{color:var(--accent-cyan);}

.contact-form{
  background:rgba(255,255,255,.03);border:1px solid rgba(255,255,255,.08);
  border-radius:var(--radius);padding:34px;display:flex;flex-direction:column;gap:18px;
}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:18px;}
.contact-form input,.contact-form textarea{
  width:100%;background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.12);
  border-radius:8px;padding:13px 16px;color:var(--text-light);font-size:14px;font-family:inherit;
  transition:var(--transition);resize:vertical;
}
.contact-form input:focus,.contact-form textarea:focus{
  outline:none;border-color:var(--accent-cyan);background:rgba(255,255,255,.06);
}
.contact-form ::placeholder{color:var(--text-muted);}
.form-tip{display:none;color:var(--accent-cyan);font-size:13px;text-align:center;}

/* ===== Footer ===== */
.site-footer{background:var(--bg-darker);padding:40px 0;border-top:1px solid rgba(255,255,255,.06);}
.footer-inner{display:flex;flex-direction:column;align-items:center;gap:14px;text-align:center;}
.footer-brand{display:flex;align-items:center;gap:10px;}
.footer-copy,.footer-beian{color:var(--text-muted);font-size:12.5px;}

/* ===== Responsive ===== */
@media (max-width:960px){
  .main-nav{
    position:fixed;top:0;right:0;height:100vh;width:260px;
    background:rgba(6,8,25,.98);backdrop-filter:blur(14px);
    flex-direction:column;justify-content:center;align-items:flex-start;
    padding:40px;gap:26px;transform:translateX(100%);transition:var(--transition);
  }
  .main-nav.open{transform:translateX(0);}
  .nav-toggle{display:flex;}
  .about-grid,.contact-grid{grid-template-columns:1fr;gap:40px;}
  .business-grid{grid-template-columns:repeat(2,1fr);}
  .advantage-grid{grid-template-columns:repeat(2,1fr);}
  .form-row{grid-template-columns:1fr;}
}
@media (max-width:600px){
  .business-grid{grid-template-columns:1fr;}
  .advantage-grid{grid-template-columns:1fr;}
  .about-stats{grid-template-columns:1fr 1fr;}
  .about-media-badge{right:12px;bottom:-18px;padding:14px 18px;}
}