/* ====== CSS Variables & Reset ====== */
:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #0d0d18;
  --bg-card: rgba(20,20,40,0.6);
  --bg-card-hover: rgba(30,30,60,0.7);
  --border: rgba(255,255,255,0.06);
  --border-active: rgba(100,180,255,0.25);
  --text-primary: #f0f0f5;
  --text-secondary: #a0a0c0;
  --text-muted: #606080;
  --accent-cyan: #00e5ff;
  --accent-blue: #4d7cff;
  --accent-purple: #a855f7;
  --accent-pink: #e04090;
  --accent-green: #00e676;
  --gradient-primary: linear-gradient(135deg, #4d7cff 0%, #a855f7 50%, #e04090 100%);
  --gradient-cyan: linear-gradient(135deg, #00e5ff 0%, #4d7cff 100%);
  --gradient-card: linear-gradient(180deg, rgba(77,124,255,0.06) 0%, rgba(168,85,247,0.02) 100%);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-card: 0 4px 24px rgba(0,0,0,0.3);
  --shadow-glow: 0 0 40px rgba(77,124,255,0.15);
  --transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{
  font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;
  background:var(--bg-primary);color:var(--text-primary);
  line-height:1.6;overflow-x:hidden;-webkit-font-smoothing:antialiased;
}
a{text-decoration:none;color:inherit}
ul{list-style:none}
img{max-width:100%;display:block}

/* ====== Utility ====== */
.container{max-width:1200px;margin:0 auto;padding:0 24px}
.gradient-text{background:var(--gradient-primary);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.section{padding:100px 0;position:relative}
.section-header{text-align:center;margin-bottom:60px}
.section-label{
  display:inline-block;font-size:13px;font-weight:600;letter-spacing:2px;
  text-transform:uppercase;color:var(--accent-blue);margin-bottom:12px;
  padding:4px 12px;border-radius:20px;background:rgba(77,124,255,0.1);border:1px solid rgba(77,124,255,0.2);
}
.section-title{font-size:40px;font-weight:700;margin-bottom:16px;line-height:1.2}
.section-subtitle{font-size:17px;color:var(--text-secondary);max-width:600px;margin:0 auto}

/* ====== Buttons ====== */
.btn{
  display:inline-flex;align-items:center;gap:8px;padding:12px 28px;
  border-radius:var(--radius-md);font-size:15px;font-weight:600;
  cursor:pointer;transition:var(--transition);border:none;white-space:nowrap;
}
.btn-primary{background:var(--gradient-primary);color:#fff;box-shadow:0 4px 20px rgba(77,124,255,0.3)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 30px rgba(77,124,255,0.4)}
.btn-outline{
  background:transparent;color:var(--text-primary);
  border:1px solid var(--border-active);backdrop-filter:blur(10px);
}
.btn-outline:hover{background:rgba(77,124,255,0.1);border-color:var(--accent-blue)}
.btn-ghost{background:transparent;color:var(--text-secondary);border:1px solid transparent}
.btn-ghost:hover{color:var(--text-primary);background:rgba(255,255,255,0.05)}
.btn-sm{padding:8px 18px;font-size:13px}
.btn-lg{padding:16px 36px;font-size:17px;border-radius:var(--radius-lg)}

/* ====== Navigation ====== */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:1000;
  background:rgba(10,10,15,0.85);backdrop-filter:blur(20px) saturate(180%);
  border-bottom:1px solid var(--border);transition:var(--transition);
}
.nav-inner{
  max-width:1200px;margin:0 auto;padding:0 24px;
  display:flex;align-items:center;justify-content:space-between;height:64px;
}
.nav-logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:20px}
.nav-logo-icon{
  width:36px;height:36px;flex-shrink:0;
}
.nav-links{display:flex;align-items:center;gap:32px}
.nav-links a{font-size:14px;color:var(--text-secondary);transition:var(--transition);position:relative}
.nav-links a:hover,.nav-links a.active{color:var(--text-primary)}
.nav-links a::after{
  content:'';position:absolute;bottom:-4px;left:0;width:0;height:2px;
  background:var(--gradient-primary);transition:width 0.3s ease;border-radius:1px;
}
.nav-links a:hover::after,.nav-links a.active::after{width:100%}
.nav-actions{display:flex;align-items:center;gap:12px}
.lang-switch{
  background:rgba(255,255,255,0.05);border:1px solid var(--border);
  color:var(--text-secondary);border-radius:var(--radius-sm);
  padding:6px 10px;font-size:13px;cursor:pointer;transition:var(--transition);
  outline:none;appearance:none;-webkit-appearance:none;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23a0a0c0' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 8px center;padding-right:28px;
}
.lang-switch:hover{border-color:var(--border-active)}
.lang-switch option{background:var(--bg-secondary);color:var(--text-primary)}
.hamburger{display:none;flex-direction:column;gap:5px;cursor:pointer;background:none;border:none;padding:4px}
.hamburger span{display:block;width:22px;height:2px;background:var(--text-primary);border-radius:1px;transition:var(--transition)}

/* ====== Hero ====== */
.hero{
  min-height:100vh;display:flex;align-items:center;justify-content:center;
  position:relative;overflow:hidden;padding-top:64px;
}
#particles-canvas{position:absolute;top:0;left:0;width:100%;height:100%;z-index:0}
.grid-overlay{
  position:absolute;top:0;left:0;width:100%;height:100%;z-index:0;opacity:0.03;
  background-image:linear-gradient(rgba(255,255,255,0.1) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,0.1) 1px,transparent 1px);
  background-size:60px 60px;
}
.hero-glow{
  position:absolute;border-radius:50%;filter:blur(120px);opacity:0.15;z-index:0;
}
.hero-glow-1{width:500px;height:500px;background:var(--accent-blue);top:-100px;left:-100px}
.hero-glow-2{width:400px;height:400px;background:var(--accent-purple);bottom:-100px;right:-100px}
.hero-glow-3{width:300px;height:300px;background:var(--accent-cyan);top:50%;left:50%;transform:translate(-50%,-50%)}
.hero-content{position:relative;z-index:1;text-align:center;max-width:800px}
.hero-badge{
  display:inline-flex;align-items:center;gap:8px;padding:6px 16px;
  border-radius:20px;background:rgba(77,124,255,0.1);border:1px solid rgba(77,124,255,0.2);
  font-size:13px;color:var(--accent-blue);margin-bottom:32px;animation:fadeInUp 0.6s ease;
}
.hero-badge-dot{width:6px;height:6px;border-radius:50%;background:var(--accent-cyan);animation:pulse 2s infinite}
.hero-title{font-size:56px;font-weight:800;line-height:1.15;margin-bottom:24px;animation:fadeInUp 0.6s ease 0.1s both}
.hero-title .highlight{background:var(--gradient-primary);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-subtitle{
  font-size:18px;color:var(--text-secondary);max-width:600px;margin:0 auto 40px;
  line-height:1.7;animation:fadeInUp 0.6s ease 0.2s both;
}
.hero-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;animation:fadeInUp 0.6s ease 0.3s both}
.hero-stats{
  display:flex;gap:48px;justify-content:center;margin-top:64px;
  flex-wrap:wrap;animation:fadeInUp 0.6s ease 0.4s both;
}
.hero-stat{text-align:center}
.hero-stat-value{font-size:36px;font-weight:800;margin-bottom:4px}
.hero-stat-label{font-size:14px;color:var(--text-muted)}

/* ====== Services ====== */
.services-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:24px}
.service-card{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius-lg);padding:36px 28px;transition:var(--transition);
  position:relative;overflow:hidden;backdrop-filter:blur(10px);
}
.service-card::before{
  content:'';position:absolute;top:0;left:0;right:0;height:2px;
  background:var(--gradient-primary);opacity:0;transition:opacity 0.3s ease;
}
.service-card:hover{transform:translateY(-4px);border-color:var(--border-active);box-shadow:var(--shadow-glow)}
.service-card:hover::before{opacity:1}
.service-icon{
  width:56px;height:56px;border-radius:var(--radius-md);
  display:flex;align-items:center;justify-content:center;font-size:26px;
  margin-bottom:20px;background:rgba(77,124,255,0.1);border:1px solid rgba(77,124,255,0.15);
}
.service-card h3{font-size:20px;font-weight:700;margin-bottom:12px}
.service-card p{font-size:14px;color:var(--text-secondary);line-height:1.7;margin-bottom:20px}
.service-features{display:flex;flex-wrap:wrap;gap:8px}
.service-tag{
  font-size:12px;padding:4px 10px;border-radius:20px;
  background:rgba(77,124,255,0.08);color:var(--accent-blue);border:1px solid rgba(77,124,255,0.15);
}

/* ====== Cases ====== */
.cases-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(340px,1fr));gap:24px}
.case-card{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius-lg);overflow:hidden;transition:var(--transition);
  backdrop-filter:blur(10px);
}
.case-card:hover{transform:translateY(-4px);border-color:var(--border-active);box-shadow:var(--shadow-glow)}
.case-image{
  height:200px;background:var(--gradient-card);
  display:flex;align-items:center;justify-content:center;font-size:48px;
  position:relative;overflow:hidden;
}
.case-image::after{
  content:'';position:absolute;bottom:0;left:0;right:0;height:60px;
  background:linear-gradient(transparent,var(--bg-card));
}
.case-body{padding:24px}
.case-tags{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:12px}
.case-tag{
  font-size:11px;padding:3px 10px;border-radius:12px;font-weight:600;
  background:rgba(0,229,255,0.1);color:var(--accent-cyan);border:1px solid rgba(0,229,255,0.2);
}
.case-body h3{font-size:18px;font-weight:700;margin-bottom:8px}
.case-desc{font-size:14px;color:var(--text-secondary);line-height:1.7;margin-bottom:16px}
.case-scenarios,.case-highlights{margin-bottom:14px}
.case-scenarios h4,.case-highlights h4{
  font-size:13px;font-weight:700;margin-bottom:8px;
  color:var(--text-primary);display:flex;align-items:center;gap:6px;
}
.case-scenarios h4::before{content:'🎯'}
.case-highlights h4::before{content:'✨'}
.case-scenarios ul,.case-highlights ul{
  list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:5px;
}
.case-scenarios li,.case-highlights li{
  font-size:13px;color:var(--text-secondary);line-height:1.5;
  padding-left:16px;position:relative;
}
.case-scenarios li::before{
  content:'▸';position:absolute;left:0;color:var(--accent-cyan);font-size:10px;top:2px;
}
.case-highlights li::before{
  content:'★';position:absolute;left:0;color:var(--accent-blue);font-size:10px;top:2px;
}
.case-metrics{display:flex;gap:24px;padding-top:14px;border-top:1px solid var(--border)}
.case-metric{text-align:center}
.case-metric-value{font-size:22px;font-weight:700;color:var(--accent-blue)}
.case-metric-label{font-size:12px;color:var(--text-muted)}

/* ====== About ====== */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.about-content h2{font-size:36px;font-weight:700;margin-bottom:20px}
.about-content p{font-size:15px;color:var(--text-secondary);line-height:1.8;margin-bottom:16px}
.about-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:32px}
.about-stat{
  text-align:center;padding:20px;border-radius:var(--radius-md);
  background:var(--bg-card);border:1px solid var(--border);
}
.about-stat-value{font-size:28px;font-weight:800;background:var(--gradient-primary);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.about-stat-label{font-size:13px;color:var(--text-muted);margin-top:4px}
.about-visual{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.about-tech-card{
  padding:24px;border-radius:var(--radius-md);text-align:center;
  background:var(--bg-card);border:1px solid var(--border);transition:var(--transition);
}
.about-tech-card:hover{border-color:var(--border-active);transform:translateY(-2px)}
.about-tech-icon{font-size:32px;margin-bottom:8px}
.about-tech-card h4{font-size:15px;font-weight:600;margin-bottom:4px}
.about-tech-card p{font-size:12px;color:var(--text-muted)}

/* ====== Contact ====== */
.contact-wrapper{
  max-width:600px;margin:0 auto;text-align:center;
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius-xl);padding:48px;backdrop-filter:blur(10px);
}
.contact-icon{
  width:72px;height:72px;border-radius:50%;margin:0 auto 24px;
  background:rgba(77,124,255,0.1);border:1px solid rgba(77,124,255,0.2);
  display:flex;align-items:center;justify-content:center;font-size:32px;
}
.contact-wrapper h3{font-size:24px;font-weight:700;margin-bottom:8px}
.contact-wrapper > p{font-size:15px;color:var(--text-secondary);margin-bottom:32px}
.contact-email-box{
  display:flex;align-items:center;justify-content:center;gap:12px;
  padding:16px 24px;background:rgba(255,255,255,0.03);border:1px solid var(--border);
  border-radius:var(--radius-md);margin-bottom:24px;flex-wrap:wrap;
}
.contact-email{
  font-size:18px;font-weight:600;color:var(--accent-cyan);
  font-family:var(--font-mono);word-break:break-all;
}
.contact-copy-btn{
  padding:8px 16px;border-radius:var(--radius-sm);font-size:13px;cursor:pointer;
  background:rgba(0,229,255,0.1);color:var(--accent-cyan);border:1px solid rgba(0,229,255,0.2);
  transition:var(--transition);white-space:nowrap;
}
.contact-copy-btn:hover{background:rgba(0,229,255,0.2)}
.contact-copy-btn.copied{background:rgba(0,230,118,0.15);color:var(--accent-green);border-color:rgba(0,230,118,0.3)}
.contact-info{font-size:14px;color:var(--text-muted);line-height:1.8}

/* ====== Footer ====== */
.footer{
  border-top:1px solid var(--border);padding:48px 0 24px;
  background:var(--bg-secondary);
}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px}
.footer-brand h3{font-size:20px;font-weight:700;margin-bottom:12px}
.footer-brand p{font-size:14px;color:var(--text-muted);line-height:1.7}
.footer-col h4{font-size:14px;font-weight:600;margin-bottom:16px;color:var(--text-primary)}
.footer-col a{display:block;font-size:13px;color:var(--text-muted);margin-bottom:10px;transition:var(--transition)}
.footer-col a:hover{color:var(--accent-blue)}
.footer-bottom{
  border-top:1px solid var(--border);padding-top:24px;
  display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;
}
.footer-bottom p{font-size:13px;color:var(--text-muted)}

/* ====== Toast ====== */
.toast{
  position:fixed;bottom:32px;left:50%;transform:translateX(-50%) translateY(100px);
  background:var(--bg-card);border:1px solid var(--border-active);
  color:var(--text-primary);padding:12px 24px;border-radius:var(--radius-md);
  font-size:14px;z-index:9999;transition:transform 0.4s cubic-bezier(0.4,0,0.2,1);
  backdrop-filter:blur(20px);box-shadow:var(--shadow-glow);
}
.toast.show{transform:translateX(-50%) translateY(0)}

/* ====== Animations ====== */
@keyframes fadeInUp{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:0.4}}
.reveal{opacity:0;transform:translateY(40px);transition:opacity 0.7s ease,transform 0.7s ease}
.reveal.visible{opacity:1;transform:translateY(0)}

/* ====== Responsive ====== */
@media (max-width:1024px){
  .about-grid{grid-template-columns:1fr;gap:40px}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:768px){
  .nav-links{display:none}
  .nav-links.open{
    display:flex;flex-direction:column;position:absolute;top:64px;left:0;right:0;
    background:rgba(10,10,15,0.95);backdrop-filter:blur(20px);
    border-bottom:1px solid var(--border);padding:20px 24px;gap:16px;
  }
  .hamburger{display:flex}
  .hero-title{font-size:36px}
  .hero-stats{gap:24px}
  .hero-stat-value{font-size:28px}
  .section-title{font-size:30px}
  .section{padding:70px 0}
  .services-grid{grid-template-columns:1fr}
  .cases-grid{grid-template-columns:1fr}
  .about-stats{grid-template-columns:repeat(3,1fr);gap:12px}
  .about-stat{padding:14px}
  .about-stat-value{font-size:22px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:24px}
  .contact-wrapper{padding:32px 20px}
  .contact-email{font-size:15px}
}
@media (max-width:480px){
  .hero-title{font-size:28px}
  .hero-actions{flex-direction:column;align-items:center}
  .hero-stats{gap:16px}
  .about-stats{grid-template-columns:1fr 1fr}
  .about-visual{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;text-align:center}
}