/* ===== Reset & Base ===== */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:-apple-system,"PingFang SC","Microsoft YaHei","Helvetica Neue",sans-serif;font-size:16px;line-height:1.7;color:#1E293B;background:#fff;overflow-x:hidden}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none;transition:color .3s}
ul,ol{list-style:none}
h1,h2,h3,h4,h5,h6{font-weight:700;line-height:1.3}

/* ===== CSS Variables ===== */
:root{
  --navy:#0A1628;
  --blue:#1A73E8;
  --blue-dark:#1557b0;
  --bg-light:#F8FAFC;
  --text-primary:#1E293B;
  --text-secondary:#64748B;
  --g-blue:#4285F4;
  --g-red:#EA4335;
  --g-yellow:#FBBC05;
  --g-green:#34A853;
  --shadow:0 2px 16px rgba(10,22,40,.08);
  --shadow-lg:0 8px 32px rgba(10,22,40,.12);
  --radius:12px;
  --max-w:1200px;
  --nav-h:72px;
}

/* ===== Utility ===== */
.container{max-width:var(--max-w);margin:0 auto;padding:0 24px}
.section-title{text-align:center;margin-bottom:56px}
.section-title h2{font-size:clamp(24px,4vw,36px);color:var(--navy);margin-bottom:12px;position:relative;display:inline-block}
.section-title h2::after{content:"";display:block;width:48px;height:3px;background:var(--blue);margin:12px auto 0;border-radius:2px}
.section-title p{color:var(--text-secondary);font-size:17px;max-width:640px;margin:0 auto}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:14px 36px;border-radius:8px;font-size:16px;font-weight:600;cursor:pointer;transition:all .3s;border:none;text-decoration:none}
.btn-primary{background:var(--blue);color:#fff;box-shadow:0 4px 14px rgba(26,115,232,.35)}
.btn-primary:hover{background:var(--blue-dark);transform:translateY(-2px);box-shadow:0 6px 20px rgba(26,115,232,.45)}
.btn-outline{border:2px solid #fff;color:#fff;background:transparent}
.btn-outline:hover{background:#fff;color:var(--navy)}

/* ===== Fade-in Animation ===== */
.fade-in{opacity:0;transform:translateY(30px);transition:opacity .7s ease,transform .7s ease}
.fade-in.visible{opacity:1;transform:translateY(0)}

/* ===== Navigation ===== */
.navbar{position:fixed;top:0;left:0;right:0;z-index:1000;height:var(--nav-h);display:flex;align-items:center;transition:background .3s,box-shadow .3s}
.navbar.scrolled{background:rgba(10,22,40,.92);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);box-shadow:0 2px 20px rgba(0,0,0,.15)}
.navbar .container{display:flex;align-items:center;justify-content:space-between;width:100%}
.logo{display:flex;align-items:center;gap:2px;font-size:22px;font-weight:800;color:#fff;letter-spacing:-.5px;white-space:nowrap}
.logo .trademark{font-size:11px;vertical-align:super;margin-left:1px;font-weight:400;opacity:.85}
.logo .separator{margin:0 8px;opacity:.5;font-weight:300}
.logo .sub-brand{font-size:15px;font-weight:500;opacity:.9}
.nav-links{display:flex;align-items:center;gap:32px}
.nav-links a{color:rgba(255,255,255,.85);font-size:15px;font-weight:500;position:relative;transition:color .3s}
.nav-links a:hover{color:#fff}
.nav-links a::after{content:"";position:absolute;bottom:-4px;left:0;width:0;height:2px;background:var(--g-yellow);transition:width .3s}
.nav-links a:hover::after{width:100%}
.nav-cta{padding:8px 22px;border-radius:6px;background:var(--blue);color:#fff!important;font-weight:600;font-size:14px}
.nav-cta::after{display:none!important}
.nav-cta:hover{background:var(--blue-dark)!important}
.mobile-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px}
.mobile-toggle span{width:24px;height:2px;background:#fff;border-radius:2px;transition:all .3s}

/* ===== Hero ===== */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;background:linear-gradient(135deg,var(--navy) 0%,#0f2847 50%,#132e52 100%);overflow:hidden}
.hero::before{content:"";position:absolute;top:-50%;right:-20%;width:800px;height:800px;border-radius:50%;background:radial-gradient(circle,rgba(26,115,232,.12) 0%,transparent 70%);pointer-events:none}
.hero::after{content:"";position:absolute;bottom:-30%;left:-10%;width:600px;height:600px;border-radius:50%;background:radial-gradient(circle,rgba(66,133,244,.08) 0%,transparent 70%);pointer-events:none}
.hero .container{position:relative;z-index:2;display:flex;align-items:center;gap:60px}
.hero-content{flex:1;max-width:600px}
.hero-badge{display:inline-flex;align-items:center;gap:8px;padding:8px 18px;border-radius:50px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.12);color:rgba(255,255,255,.9);font-size:14px;margin-bottom:28px}
.hero-badge .dot{width:8px;height:8px;border-radius:50%;background:var(--g-green);animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}
.hero h1{font-size:clamp(32px,5vw,52px);color:#fff;line-height:1.2;margin-bottom:20px;font-weight:800}
.hero h1 .highlight{color:var(--g-yellow);position:relative}
.hero-desc{font-size:18px;color:rgba(255,255,255,.75);line-height:1.8;margin-bottom:36px;max-width:520px}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap}
.hero-stats{display:flex;gap:40px;margin-top:48px;padding-top:32px;border-top:1px solid rgba(255,255,255,.1)}
.hero-stat{text-align:center}
.hero-stat .num{font-size:36px;font-weight:800;color:#fff;font-family:system-ui}
.hero-stat .num span{color:var(--g-yellow)}
.hero-stat .label{font-size:14px;color:rgba(255,255,255,.6);margin-top:4px}
.hero-visual{flex:1;display:flex;justify-content:center;align-items:center}
.hero-graphic{position:relative;width:400px;height:400px}
.hero-graphic .circle{position:absolute;border-radius:50%;border:1px solid rgba(255,255,255,.08)}
.hero-graphic .circle-1{width:400px;height:400px;top:0;left:0;animation:rotate 30s linear infinite}
.hero-graphic .circle-2{width:300px;height:300px;top:50px;left:50px;animation:rotate 25s linear infinite reverse}
.hero-graphic .circle-3{width:200px;height:200px;top:100px;left:100px;animation:rotate 20s linear infinite}
@keyframes rotate{from{transform:rotate(0deg)}to{transform:rotate(360deg)}}
.hero-graphic .g-dot{position:absolute;width:12px;height:12px;border-radius:50%}
.hero-graphic .g-dot-1{background:var(--g-blue);top:0;left:194px}
.hero-graphic .g-dot-2{background:var(--g-red);top:194px;right:0}
.hero-graphic .g-dot-3{background:var(--g-yellow);bottom:0;left:194px}
.hero-graphic .g-dot-4{background:var(--g-green);top:194px;left:0}
.hero-graphic .center-text{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);text-align:center;color:#fff}
.hero-graphic .center-text .big{font-size:48px;font-weight:800;font-family:system-ui}
.hero-graphic .center-text .small{font-size:14px;opacity:.7;margin-top:4px}

/* ===== Services ===== */
.services{padding:100px 0;background:var(--bg-light)}
.services-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}
.service-card{background:#fff;border-radius:var(--radius);padding:36px 28px;box-shadow:var(--shadow);transition:all .35s;border:1px solid transparent;position:relative;overflow:hidden}
.service-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:rgba(26,115,232,.15)}
.service-card::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--g-blue),var(--g-green));transform:scaleX(0);transition:transform .35s;transform-origin:left}
.service-card:hover::before{transform:scaleX(1)}
.service-icon{width:56px;height:56px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:28px;margin-bottom:20px}
.service-icon.blue{background:rgba(66,133,244,.1);color:var(--g-blue)}
.service-icon.red{background:rgba(234,67,53,.1);color:var(--g-red)}
.service-icon.yellow{background:rgba(251,188,5,.1);color:var(--g-yellow)}
.service-icon.green{background:rgba(52,168,83,.1);color:var(--g-green)}
.service-card h3{font-size:20px;color:var(--navy);margin-bottom:10px}
.service-card p{color:var(--text-secondary);font-size:15px;line-height:1.7}
.service-card .learn-more{display:inline-flex;align-items:center;gap:6px;margin-top:16px;color:var(--blue);font-size:14px;font-weight:600}
.service-card .learn-more:hover{gap:10px}

/* ===== Advantages ===== */
.advantages{padding:100px 0;background:#fff}
.adv-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:32px}
.adv-item{display:flex;gap:20px;padding:28px;border-radius:var(--radius);transition:background .3s}
.adv-item:hover{background:var(--bg-light)}
.adv-num{flex-shrink:0;width:52px;height:52px;border-radius:50%;background:linear-gradient(135deg,var(--blue),#4a9af5);color:#fff;display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:800;font-family:system-ui}
.adv-item h3{font-size:19px;color:var(--navy);margin-bottom:8px}
.adv-item p{color:var(--text-secondary);font-size:15px}

/* ===== Process ===== */
.process{padding:100px 0;background:var(--bg-light)}
.process-steps{display:flex;gap:0;position:relative;justify-content:center;flex-wrap:wrap}
.process-step{flex:1;min-width:180px;max-width:220px;text-align:center;position:relative;padding:0 12px}
.process-step .step-icon{width:72px;height:72px;border-radius:50%;background:#fff;box-shadow:var(--shadow);display:flex;align-items:center;justify-content:center;margin:0 auto 20px;font-size:28px;position:relative;z-index:2}
.process-step .step-num{position:absolute;top:-8px;right:calc(50% - 44px);width:24px;height:24px;border-radius:50%;background:var(--blue);color:#fff;font-size:12px;font-weight:700;display:flex;align-items:center;justify-content:center;z-index:3}
.process-step h3{font-size:17px;color:var(--navy);margin-bottom:8px}
.process-step p{font-size:14px;color:var(--text-secondary)}
.process-connector{position:absolute;top:36px;left:calc(50% + 36px);width:calc(100% - 72px);height:2px;background:repeating-linear-gradient(90deg,var(--blue) 0,var(--blue) 6px,transparent 6px,transparent 12px);z-index:1}
.process-step:last-child .process-connector{display:none}

/* ===== About ===== */
.about{padding:100px 0;background:#fff}
.about-content{display:flex;gap:60px;align-items:center}
.about-image{flex-shrink:0;position:relative}
.about-image img{width:320px;height:400px;object-fit:cover;border-radius:var(--radius);box-shadow:var(--shadow-lg)}
.about-image .exp-badge{position:absolute;bottom:-20px;right:-20px;background:var(--blue);color:#fff;padding:16px 24px;border-radius:var(--radius);text-align:center;box-shadow:0 4px 20px rgba(26,115,232,.4)}
.about-image .exp-badge .num{font-size:36px;font-weight:800;font-family:system-ui;line-height:1}
.about-image .exp-badge .text{font-size:13px;margin-top:4px;opacity:.9}
.about-text{flex:1}
.about-text h2{font-size:32px;color:var(--navy);margin-bottom:8px}
.about-text .subtitle{color:var(--blue);font-size:17px;font-weight:600;margin-bottom:20px}
.about-text p{color:var(--text-secondary);font-size:16px;margin-bottom:16px;line-height:1.8}
.about-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}
.about-tags span{padding:6px 16px;border-radius:50px;background:var(--bg-light);color:var(--text-primary);font-size:14px;font-weight:500;border:1px solid #e2e8f0}

/* ===== Stats ===== */
.stats{padding:80px 0;background:linear-gradient(135deg,var(--navy) 0%,#0f2847 100%);position:relative;overflow:hidden}
.stats::before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E")}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:32px;position:relative;z-index:2}
.stat-item{text-align:center}
.stat-item .stat-num{font-size:clamp(36px,5vw,52px);font-weight:800;color:#fff;font-family:system-ui;line-height:1}
.stat-item .stat-num span{color:var(--g-yellow)}
.stat-item .stat-label{font-size:16px;color:rgba(255,255,255,.7);margin-top:8px}

/* ===== FAQ ===== */
.faq{padding:100px 0;background:var(--bg-light)}
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#fff;border-radius:var(--radius);margin-bottom:12px;box-shadow:0 1px 4px rgba(10,22,40,.05);overflow:hidden;border:1px solid #e8ecf1;transition:border-color .3s}
.faq-item.active{border-color:rgba(26,115,232,.2)}
.faq-question{display:flex;align-items:center;justify-content:space-between;padding:20px 24px;cursor:pointer;font-size:16px;font-weight:600;color:var(--navy);transition:color .3s;gap:16px}
.faq-question:hover{color:var(--blue)}
.faq-question .icon{flex-shrink:0;width:28px;height:28px;border-radius:50%;background:var(--bg-light);display:flex;align-items:center;justify-content:center;transition:all .3s;font-size:18px;color:var(--text-secondary)}
.faq-item.active .faq-question .icon{background:var(--blue);color:#fff;transform:rotate(45deg)}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .4s ease,padding .3s ease}
.faq-answer-inner{padding:0 24px 20px;color:var(--text-secondary);font-size:15px;line-height:1.8}

/* ===== Contact ===== */
.contact{padding:100px 0;background:#fff}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start}
.contact-info{display:flex;flex-direction:column;gap:28px}
.contact-card{display:flex;gap:16px;align-items:flex-start;padding:24px;border-radius:var(--radius);background:var(--bg-light);transition:all .3s}
.contact-card:hover{box-shadow:var(--shadow);transform:translateY(-2px)}
.contact-card .c-icon{width:48px;height:48px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:22px;flex-shrink:0}
.contact-card .c-icon.phone{background:rgba(52,168,83,.1);color:var(--g-green)}
.contact-card .c-icon.email{background:rgba(66,133,244,.1);color:var(--g-blue)}
.contact-card .c-icon.wechat{background:rgba(52,168,83,.1);color:var(--g-green)}
.contact-card h4{font-size:15px;color:var(--text-secondary);margin-bottom:4px;font-weight:500}
.contact-card .c-value{font-size:18px;font-weight:700;color:var(--navy)}
.contact-qr{text-align:center}
.contact-qr img{width:200px;height:200px;border-radius:var(--radius);box-shadow:var(--shadow);margin:0 auto 12px}
.contact-qr p{color:var(--text-secondary);font-size:14px}
.contact-cta{text-align:center;margin-top:40px;padding:40px;background:linear-gradient(135deg,var(--navy),#132e52);border-radius:var(--radius)}
.contact-cta h3{color:#fff;font-size:24px;margin-bottom:12px}
.contact-cta p{color:rgba(255,255,255,.7);margin-bottom:24px}

/* ===== Footer ===== */
.footer{background:var(--navy);color:rgba(255,255,255,.7);padding:60px 0 0}
.footer-links{padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,.08)}
.footer-links h4{color:#fff;font-size:16px;margin-bottom:20px}
.footer-links-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:10px 24px}
.footer-links-grid a{font-size:14px;color:rgba(255,255,255,.55);transition:color .3s;display:block;padding:3px 0}
.footer-links-grid a:hover{color:#fff}
.footer-bottom{padding:24px 0;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:13px}
.footer-bottom a{color:rgba(255,255,255,.55);transition:color .3s}
.footer-bottom a:hover{color:#fff}
.footer-icp a{border-bottom:1px dashed rgba(255,255,255,.3)}

/* ===== Back to Top ===== */
.back-top{position:fixed;bottom:32px;right:32px;width:44px;height:44px;border-radius:50%;background:var(--blue);color:#fff;display:flex;align-items:center;justify-content:center;font-size:20px;cursor:pointer;opacity:0;visibility:hidden;transition:all .3s;box-shadow:0 4px 14px rgba(26,115,232,.35);z-index:999;border:none}
.back-top.show{opacity:1;visibility:visible}
.back-top:hover{transform:translateY(-3px);box-shadow:0 6px 20px rgba(26,115,232,.5)}

/* ===== Responsive ===== */
@media(max-width:1024px){
  .hero .container{flex-direction:column;text-align:center}
  .hero-content{max-width:100%}
  .hero-desc{margin-left:auto;margin-right:auto}
  .hero-actions{justify-content:center}
  .hero-stats{justify-content:center}
  .hero-visual{display:none}
  .about-content{flex-direction:column;text-align:center}
  .about-image img{width:260px;height:320px;margin:0 auto}
  .about-tags{justify-content:center}
  .adv-grid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .nav-links{display:none;position:fixed;top:var(--nav-h);left:0;right:0;bottom:0;background:rgba(10,22,40,.98);flex-direction:column;align-items:center;justify-content:center;gap:28px}
  .nav-links.open{display:flex}
  .mobile-toggle{display:flex}
  .hero{min-height:auto;padding:120px 0 80px}
  .hero h1{font-size:28px}
  .hero-stats{flex-wrap:wrap;gap:24px}
  .process-steps{flex-direction:column;align-items:center}
  .process-connector{display:none}
  .process-step{max-width:100%}
  .services-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;text-align:center}
  .footer-links-grid{grid-template-columns:repeat(2,1fr)}
}