*{margin:0;padding:0;box-sizing:border-box}
:root{--primary:#1468e2;--primary-light:#4a90f7;--primary-dark:#0d4fc2;--gradient:linear-gradient(135deg,#1468e2 0%,#4a90f7 100%);--bg:#ffffff;--bg-light:#f7f9fc;--bg-section:#f0f4f9;--text:#1a1a1a;--text-secondary:#5a6170;--text-muted:#8a92a3;--border:#e5e9f0;--border-light:#eef2f7;--radius:12px;--radius-lg:20px;--shadow:0 4px 20px rgba(20,104,226,0.08);--shadow-lg:0 10px 40px rgba(20,104,226,0.12)}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","Segoe UI",Roboto,"Noto Sans SC",sans-serif;font-size:16px;line-height:1.6;color:var(--text);background:var(--bg)}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
a{color:var(--primary);text-decoration:none;transition:all .3s}
a:hover{color:var(--primary-dark)}
img{max-width:100%;height:auto}

.header{position:fixed;top:0;left:0;right:0;z-index:1000;background:#fff;backdrop-filter:blur(20px);border-bottom:1px solid var(--border-light);box-shadow:0 1px 3px rgba(0,0,0,0.05)}
.header-inner{max-width:1200px;margin:0 auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between;height:72px}
.logo{display:flex;align-items:center;gap:10px}
.logo img{width:36px;height:36px;border-radius:10px}
.logo span{font-size:20px;font-weight:700;color:var(--text)}
.menu-btn{display:none;width:44px;height:44px;background:none;border:none;cursor:pointer;flex-direction:column;justify-content:center;align-items:center;gap:6px}
.menu-btn span{display:block;width:22px;height:2px;background:var(--text);transition:all .3s}
.nav{display:flex;align-items:center;gap:8px}
.nav a{padding:10px 18px;font-size:15px;color:var(--text-secondary);border-radius:8px;transition:all .3s}
.nav a:hover{color:var(--primary);background:var(--bg-light)}
.nav-btn{background:var(--gradient)!important;color:#fff!important;font-weight:600}
.nav-btn:hover{opacity:.9;transform:translateY(-1px);color:#fff!important}

.hero{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:120px 24px 80px;position:relative;overflow:hidden;background:linear-gradient(180deg,#f0f7ff 0%,#fff 100%)}
.hero-bg{position:absolute;inset:0;z-index:-1}
.hero-bg::before{content:'';position:absolute;top:-50%;right:-20%;width:800px;height:800px;background:radial-gradient(circle,rgba(20,104,226,0.08) 0%,transparent 70%);border-radius:50%}
.hero-bg::after{content:'';position:absolute;bottom:-30%;left:-10%;width:600px;height:600px;background:radial-gradient(circle,rgba(74,144,247,0.06) 0%,transparent 70%);border-radius:50%}
.hero-container{display:flex;align-items:center;justify-content:space-between;gap:60px;width:100%}
.hero-content{flex:1;max-width:580px}
.hero h1{font-size:48px;font-weight:700;line-height:1.2;margin-bottom:24px;color:var(--text)}
.hero h1 span{color:var(--primary)}
.hero-desc{font-size:18px;color:var(--text-secondary);margin-bottom:32px;line-height:1.8}
.hero-chains{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:40px}
.hero-chains span{padding:8px 16px;background:#fff;border:1px solid var(--border);border-radius:20px;font-size:13px;color:var(--text-secondary);box-shadow:0 2px 8px rgba(0,0,0,0.04)}
.hero-btns{display:flex;gap:16px;flex-wrap:wrap}
.btn-primary,.btn-ghost,.btn-outline,.btn-warning,.btn-large{display:inline-flex;align-items:center;justify-content:center;padding:14px 32px;font-size:16px;font-weight:600;border-radius:var(--radius);cursor:pointer;transition:all .3s;min-height:52px}
.btn-primary{background:var(--gradient);color:#fff;border:none;box-shadow:0 4px 15px rgba(20,104,226,0.3)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 25px rgba(20,104,226,0.4);color:#fff}
.btn-ghost{background:#fff;color:var(--primary);border:2px solid var(--border)}
.btn-ghost:hover{border-color:var(--primary);background:var(--bg-light)}
.btn-outline{background:transparent;color:var(--primary);border:2px solid var(--primary)}
.btn-outline:hover{background:var(--primary);color:#fff}
.btn-warning{background:#f59e0b;color:#fff;border:none}
.btn-warning:hover{background:#d97706;color:#fff}
.btn-large{padding:18px 48px;font-size:18px}
.hero-phone{flex-shrink:0}
.phone-frame{width:280px;height:560px;background:linear-gradient(180deg,#1a1f2e 0%,#0f1318 100%);border-radius:40px;padding:10px;box-shadow:var(--shadow-lg),0 0 0 1px rgba(0,0,0,0.1)}
.phone-frame img{width:100%;height:100%;object-fit:cover;border-radius:32px}

.stats{padding:60px 0;background:#fff;border-bottom:1px solid var(--border-light)}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:40px}
.stat-item{text-align:center}
.stat-num{font-size:42px;font-weight:700;color:var(--primary);margin-bottom:8px}
.stat-label{color:var(--text-muted);font-size:14px}

.section-header{text-align:center;margin-bottom:60px}
.section-header h2{font-size:36px;font-weight:700;margin-bottom:16px;color:var(--text)}
.section-header p{color:var(--text-secondary);font-size:18px}
.section-header.light h2{color:#fff}
.section-header.light p{color:rgba(255,255,255,0.8)}

.intro{padding:100px 0;background:#fff}
.intro-content{display:grid;grid-template-columns:1fr 400px;gap:80px;align-items:center}
.intro-text p{color:var(--text-secondary);margin-bottom:20px;font-size:17px;line-height:1.9}
.intro-img img{border-radius:var(--radius-lg);box-shadow:var(--shadow-lg)}
.link-arrow{display:inline-flex;align-items:center;gap:8px;color:var(--primary);font-weight:600;margin-top:16px}
.link-arrow:hover{gap:12px}
.link-arrow::after{content:'→'}

.features{padding:100px 0;background:var(--bg-section)}
.features-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-bottom:50px}
.feature-card{background:#fff;border:1px solid var(--border-light);border-radius:var(--radius-lg);padding:40px 28px;text-align:center;transition:all .3s}
.feature-card:hover{transform:translateY(-8px);border-color:var(--primary);box-shadow:var(--shadow-lg)}
.feature-icon{width:80px;height:80px;margin:0 auto 24px;background:var(--bg-light);border-radius:50%;display:flex;align-items:center;justify-content:center;overflow:hidden}
.feature-icon img{width:100%;height:100%;object-fit:cover}
.feature-card h3{font-size:20px;margin-bottom:16px;color:var(--text)}
.feature-card p{color:var(--text-secondary);font-size:14px;line-height:1.7}
.features-cta{text-align:center}

.download{padding:100px 0;background:#fff}
.download-content{display:grid;grid-template-columns:1fr 400px;gap:80px;align-items:start}
.download-warning{background:linear-gradient(135deg,rgba(20,104,226,0.08) 0%,rgba(74,144,247,0.08) 100%);border:1px solid rgba(20,104,226,0.2);border-radius:var(--radius);padding:20px 24px;margin-bottom:40px}
.download-warning strong{color:var(--primary);display:block;margin-bottom:8px}
.download-warning p{color:var(--text-secondary);font-size:14px;margin:0}
.download-methods h3,.download-steps h3{font-size:22px;margin-bottom:24px;color:var(--text)}
.method-item{display:flex;gap:16px;margin-bottom:16px;padding:20px;background:var(--bg-light);border-radius:var(--radius);border:1px solid var(--border-light);transition:all .3s}
.method-item:hover{border-color:var(--primary);box-shadow:var(--shadow)}
.method-icon{font-size:28px;flex-shrink:0}
.method-text strong{display:block;margin-bottom:6px;color:var(--text)}
.method-text p{color:var(--text-secondary);font-size:14px;margin:0}
.download-steps{margin-top:40px}
.download-steps ol{padding-left:24px}
.download-steps li{color:var(--text-secondary);padding:12px 0;border-bottom:1px solid var(--border-light)}
.download-steps li:last-child{border-bottom:none}
.download-btns{display:flex;gap:16px;margin-top:40px;flex-wrap:wrap}
.download-phones{position:relative}
.phone-stack{display:flex}
.phone-item{width:220px;height:440px;background:linear-gradient(180deg,#1a1f2e 0%,#0f1318 100%);border-radius:30px;padding:8px;box-shadow:var(--shadow-lg)}
.phone-item:nth-child(2){margin-left:-60px;margin-top:40px}
.phone-item img{width:100%;height:100%;object-fit:cover;border-radius:24px}

.security{padding:100px 0;background:var(--bg-section)}
.security-content{display:grid;grid-template-columns:1fr 400px;gap:60px;margin-bottom:40px}
.security-intro{background:#fff;border:1px solid var(--border-light);border-radius:var(--radius);padding:24px;margin-bottom:40px}
.security-intro p{color:var(--text-secondary);margin:0}
.security-tips h3{font-size:22px;margin-bottom:24px;color:var(--text)}
.tip-item{display:flex;gap:16px;margin-bottom:20px}
.tip-icon{font-size:24px;flex-shrink:0;width:48px;height:48px;background:linear-gradient(135deg,rgba(20,104,226,0.1) 0%,rgba(74,144,247,0.1) 100%);border-radius:12px;display:flex;align-items:center;justify-content:center}
.tip-content strong{display:block;margin-bottom:6px;color:var(--text)}
.tip-content p{color:var(--text-secondary);font-size:14px;margin:0}
.security-warning{background:#fffbeb;border:1px solid #fcd34d;border-radius:var(--radius-lg);padding:32px}
.security-warning h3{color:#b45309;margin-bottom:20px}
.security-warning ul{list-style:none;padding:0;margin-bottom:24px}
.security-warning li{color:var(--text-secondary);padding:10px 0 10px 28px;position:relative}
.security-warning li::before{content:'⚠';position:absolute;left:0;color:#f59e0b}
.security-disclaimer{background:#fef2f2;border:1px solid #fecaca;border-radius:var(--radius);padding:20px 24px;text-align:center}
.security-disclaimer strong{color:#dc2626}

.faq{padding:100px 0;background:#fff}
.faq-list{max-width:800px;margin:0 auto}
.faq-item{border-bottom:1px solid var(--border)}
.faq-q{width:100%;padding:24px 50px 24px 0;background:none;border:none;text-align:left;font-size:17px;font-weight:600;color:var(--text);cursor:pointer;position:relative;transition:all .3s}
.faq-q::after{content:'+';position:absolute;right:0;top:50%;transform:translateY(-50%);font-size:24px;color:var(--primary);transition:all .3s;font-weight:400}
.faq-item.active .faq-q::after{content:'−'}
.faq-q:hover{color:var(--primary)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .4s}
.faq-item.active .faq-a{max-height:300px}
.faq-a p{padding:0 0 24px;color:var(--text-secondary);line-height:1.8}
.faq-more{text-align:center;margin-top:60px}
.faq-more p{color:var(--text-muted);margin-bottom:20px}

.news{padding:100px 0;background:var(--bg-section)}
.news-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-bottom:40px}
.news-card{background:#fff;border:1px solid var(--border-light);border-radius:var(--radius-lg);padding:28px;transition:all .3s}
.news-card:hover{transform:translateY(-5px);border-color:var(--primary);box-shadow:var(--shadow-lg)}
.news-date{display:inline-block;padding:4px 12px;background:var(--gradient);color:#fff;border-radius:20px;font-size:12px;margin-bottom:16px}
.news-card h3{font-size:18px;margin-bottom:12px;line-height:1.4;color:var(--text)}
.news-card p{color:var(--text-secondary);font-size:14px;line-height:1.7}
.news-more{text-align:center}

.about{padding:100px 0;background:#fff}
.about-content{display:grid;grid-template-columns:500px 1fr;gap:80px;align-items:center}
.about-img img{border-radius:var(--radius-lg);box-shadow:var(--shadow-lg)}
.about-text h2{font-size:32px;margin-bottom:24px;color:var(--text)}
.about-text p{color:var(--text-secondary);margin-bottom:20px;line-height:1.8}

.contact{padding:100px 0;background:var(--gradient)}
.contact-box{text-align:center;max-width:600px;margin:0 auto}
.contact-box h2{font-size:32px;margin-bottom:20px;color:#fff}
.contact-box p{color:rgba(255,255,255,0.9);margin-bottom:40px;font-size:18px}
.contact-box .btn-large{background:#fff;color:var(--primary)}
.contact-box .btn-large:hover{background:var(--bg-light);transform:translateY(-2px)}
.contact-note{display:block;margin-top:20px;color:rgba(255,255,255,0.7);font-size:14px}

.footer{padding:60px 0 40px;background:var(--bg-light);border-top:1px solid var(--border-light)}
.footer-top{display:flex;justify-content:space-between;align-items:center;padding-bottom:40px;border-bottom:1px solid var(--border)}
.footer-brand{display:flex;align-items:center;gap:10px}
.footer-brand img{border-radius:8px}
.footer-brand span{font-size:18px;font-weight:600;color:var(--text)}
.footer-nav{display:flex;gap:32px}
.footer-nav a{color:var(--text-muted);font-size:14px}
.footer-nav a:hover{color:var(--primary)}
.footer-bottom{padding-top:40px;text-align:center}
.footer-bottom>p{color:var(--text-muted);margin-bottom:20px;font-size:14px}
.footer-bottom a{color:var(--primary)}
.footer-links{display:flex;justify-content:center;gap:24px;margin-bottom:20px}
.footer-links a{color:var(--text-muted);font-size:13px}
.copyright,.icp,.update-time{color:var(--text-muted);font-size:13px;margin-bottom:8px}

.back-top{position:fixed;bottom:60px;right:30px;width:50px;height:50px;background:var(--gradient);border:none;border-radius:50%;cursor:pointer;opacity:0;visibility:hidden;transition:all .3s;z-index:999;display:flex;align-items:center;justify-content:center;color:#fff;box-shadow:var(--shadow-lg)}
.back-top.visible{opacity:1;visibility:visible}
.back-top:hover{transform:translateY(-3px)}

@media(max-width:1024px){
.hero-container{flex-direction:column;text-align:center}
.hero-content{margin-right:0;margin-bottom:60px;max-width:100%}
.hero-btns,.hero-chains{justify-content:center}
.hero-phone{display:none}
.stats-grid{grid-template-columns:repeat(2,1fr)}
.intro-content,.download-content,.security-content,.about-content{grid-template-columns:1fr}
.intro-img,.download-phones,.about-img{order:-1;text-align:center}
.intro-img img,.about-img img{max-width:350px}
.features-grid,.news-grid{grid-template-columns:repeat(2,1fr)}
}

@media(max-width:768px){
.header-inner{height:64px}
.menu-btn{display:flex}
.nav{position:fixed;top:64px;left:0;right:0;background:#fff;flex-direction:column;padding:20px;transform:translateY(-100%);opacity:0;visibility:hidden;transition:all .3s;border-bottom:1px solid var(--border);box-shadow:var(--shadow)}
.nav.active{transform:translateY(0);opacity:1;visibility:visible}
.nav a{width:100%;text-align:center;padding:16px}
.hero h1{font-size:32px}
.hero-desc{font-size:16px}
.section-header h2{font-size:28px}
.stats-grid,.features-grid,.news-grid{grid-template-columns:1fr}
.stat-num{font-size:32px}
.download-btns{flex-direction:column}
.download-btns .btn-primary,.download-btns .btn-outline{width:100%}
.footer-top{flex-direction:column;gap:30px;text-align:center}
.footer-nav{flex-wrap:wrap;justify-content:center;gap:16px}
.footer-links{flex-wrap:wrap}
.back-top{bottom:110px;right:20px;width:44px;height:44px}
}

@media(max-width:480px){
.container{padding:0 16px}
.hero{padding:90px 16px 60px}
.hero h1{font-size:28px}
.section-header h2{font-size:24px}
.feature-card,.news-card{padding:24px 20px}
.method-item{flex-direction:column;text-align:center}
.tip-item{flex-direction:column;text-align:center}
.tip-icon{margin:0 auto}
}