.header{position:fixed;top:0;left:0;right:0;background:rgba(255,255,255,.98);backdrop-filter:blur(10px);z-index:1000;border-bottom:1px solid var(--border);transition:box-shadow .3s}
.header.scrolled{box-shadow:0 2px 20px rgba(0,0,0,.08)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:70px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.25rem;color:var(--text)}
.logo img{border-radius:8px}
.nav{display:flex;gap:8px}
.nav-link{padding:8px 16px;color:var(--text-light);font-size:.9rem;border-radius:6px;transition:all .2s}
.nav-link:hover{color:var(--primary);background:rgba(0,102,255,.05)}
.nav-toggle{display:none;flex-direction:column;gap:5px;padding:10px;background:none;border:none;cursor:pointer}
.nav-toggle span{width:24px;height:2px;background:var(--text);transition:all .3s}
.header-btn{display:block}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 24px;font-size:.95rem;font-weight:500;border-radius:8px;border:none;cursor:pointer;transition:all .2s}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark);transform:translateY(-1px)}
.btn-outline{background:transparent;color:var(--primary);border:2px solid var(--primary)}
.btn-outline:hover{background:var(--primary);color:#fff}
.btn-white{background:#fff;color:var(--primary)}
.btn-white:hover{background:rgba(255,255,255,.9)}
.btn-lg{padding:14px 32px;font-size:1.05rem}
.hero{position:relative;min-height:100vh;display:flex;align-items:center;padding:120px 0 80px;overflow:hidden}
.hero-bg{position:absolute;inset:0;z-index:-1}
.hero-bg img{width:100%;height:100%;object-fit:cover;opacity:.15}
.hero-bg::after{content:'';position:absolute;inset:0;background:linear-gradient(135deg,rgba(0,102,255,.1) 0%,rgba(255,255,255,.95) 100%)}
.hero-content{position:relative;max-width:800px}
.breadcrumb{display:flex;align-items:center;gap:8px;margin-bottom:24px;font-size:.9rem;color:var(--text-light)}
.breadcrumb a{color:var(--text-light)}
.breadcrumb a:hover{color:var(--primary)}
.hero h1{font-size:2.75rem;font-weight:700;line-height:1.3;margin-bottom:20px;color:var(--text)}
.hero-desc{font-size:1.15rem;color:var(--text-light);margin-bottom:32px;line-height:1.7}
.hero-actions{display:flex;flex-wrap:wrap;gap:16px;margin-bottom:48px}
.hero-stats{display:flex;gap:48px}
.stat-item{text-align:center}
.stat-num{display:block;font-size:1.75rem;font-weight:700;color:var(--primary)}
.stat-label{font-size:.9rem;color:var(--text-light)}
.section{padding:80px 0}
.section:nth-child(even){background:var(--bg)}
.section-title{font-size:2rem;font-weight:700;text-align:center;margin-bottom:16px}
.section-desc{text-align:center;color:var(--text-light);max-width:700px;margin:0 auto 48px;font-size:1.05rem}
.intro-grid{display:grid;grid-template-columns:1fr 1.2fr;gap:60px;align-items:center}
.intro-main img{border-radius:16px;box-shadow:0 20px 60px rgba(0,0,0,.1)}
.intro-content h3{font-size:1.35rem;margin:24px 0 12px;color:var(--text)}
.intro-content h3:first-child{margin-top:0}
.intro-content p{color:var(--text-light);line-height:1.7}
.intro-content .btn{margin-top:24px}
.features-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:30px;margin-bottom:60px}
.feature-card{background:#fff;border-radius:16px;padding:30px;box-shadow:0 4px 20px rgba(0,0,0,.06);transition:transform .3s,box-shadow .3s}
.feature-card:hover{transform:translateY(-5px);box-shadow:0 12px 40px rgba(0,0,0,.1)}
.feature-icon{margin-bottom:20px;border-radius:12px;overflow:hidden}
.feature-icon img{width:100%;height:200px;object-fit:cover}
.feature-card h3{font-size:1.25rem;margin-bottom:12px}
.feature-card p{color:var(--text-light);line-height:1.7}
.compare-section{background:#fff;border-radius:16px;padding:40px;box-shadow:0 4px 20px rgba(0,0,0,.06)}
.compare-section h3{font-size:1.5rem;margin-bottom:24px;text-align:center}
.compare-table-wrap{overflow-x:auto;margin-bottom:20px}
.compare-table{width:100%;border-collapse:collapse;min-width:600px}
.compare-table th,.compare-table td{padding:16px 20px;text-align:left;border-bottom:1px solid var(--border)}
.compare-table th{background:var(--bg);font-weight:600}
.compare-table tbody tr:hover{background:rgba(0,102,255,.02)}
.compare-note{text-align:center;color:var(--text-light);font-size:.95rem}
.download-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px;margin-bottom:40px}
.download-card{background:#fff;border-radius:16px;padding:36px;text-align:center;box-shadow:0 4px 20px rgba(0,0,0,.06);transition:transform .3s}
.download-card:hover{transform:translateY(-5px)}
.download-icon{width:80px;height:80px;margin:0 auto 20px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--primary),#4d94ff);border-radius:20px;color:#fff}
.download-card h3{font-size:1.35rem;margin-bottom:16px}
.download-card>p{color:var(--text-light);line-height:1.7;margin-bottom:20px}
.download-steps{background:var(--bg);border-radius:12px;padding:20px;margin-bottom:24px;text-align:left}
.download-steps h4{font-size:1rem;margin-bottom:10px;color:var(--text)}
.download-steps p{font-size:.9rem;color:var(--text-light);line-height:1.7}
.download-warning{background:linear-gradient(135deg,#fff7ed,#ffedd5);border:1px solid #fed7aa;border-radius:12px;padding:24px}
.download-warning h4{color:#c2410c;margin-bottom:12px}
.download-warning p{color:#9a3412;line-height:1.7}
.guide-content{display:grid;grid-template-columns:300px 1fr;gap:60px;align-items:start;margin-bottom:48px}
.guide-showcase{position:sticky;top:100px}
.phone-frame{background:#1a1a1a;border-radius:36px;padding:12px;box-shadow:0 20px 60px rgba(0,0,0,.2)}
.phone-frame img{border-radius:24px}
.guide-steps{display:flex;flex-direction:column;gap:32px}
.guide-item{background:#fff;border-radius:16px;padding:28px;box-shadow:0 4px 20px rgba(0,0,0,.06)}
.guide-item h3{font-size:1.25rem;margin-bottom:12px;color:var(--primary)}
.guide-item p{color:var(--text-light);line-height:1.7}
.guide-tips{background:linear-gradient(135deg,#eff6ff,#dbeafe);border-radius:16px;padding:32px;text-align:center}
.guide-tips h3{margin-bottom:16px}
.guide-tips p{color:var(--text-light);max-width:700px;margin:0 auto 24px;line-height:1.7}
.faq-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin-bottom:48px}
.faq-item{background:#fff;border-radius:12px;padding:24px;box-shadow:0 2px 12px rgba(0,0,0,.05)}
.faq-question{font-size:1.1rem;margin-bottom:12px;color:var(--text);cursor:pointer}
.faq-answer p{color:var(--text-light);line-height:1.7}
.faq-more{text-align:center;padding:32px;background:linear-gradient(135deg,var(--primary),#4d94ff);border-radius:16px;color:#fff}
.faq-more p{margin-bottom:20px;opacity:.9}
.faq-more .btn{background:#fff;color:var(--primary)}
.security-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin-bottom:40px}
.security-card{background:#fff;border-radius:12px;padding:28px;box-shadow:0 2px 12px rgba(0,0,0,.05)}
.security-card h3{font-size:1.15rem;margin-bottom:12px;color:var(--primary)}
.security-card p{color:var(--text-light);line-height:1.7}
.security-notice{background:linear-gradient(135deg,#fef2f2,#fee2e2);border:1px solid #fecaca;border-radius:12px;padding:24px}
.security-notice h4{color:#dc2626;margin-bottom:12px}
.security-notice p{color:#991b1b;line-height:1.7}
.about-content{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.about-text .section-title{text-align:left;margin-bottom:20px}
.about-text p{color:var(--text-light);line-height:1.8;margin-bottom:16px}
.about-text .btn{margin-top:12px}
.about-image img{border-radius:16px;box-shadow:0 20px 60px rgba(0,0,0,.1)}
.contact-box{background:linear-gradient(135deg,var(--primary),#4d94ff);border-radius:20px;padding:60px;text-align:center;color:#fff}
.contact-box h2{font-size:2rem;margin-bottom:16px}
.contact-box p{opacity:.9;margin-bottom:28px;font-size:1.1rem}
.footer{background:#1a1a1a;color:#fff;padding:60px 0 30px}
.footer-main{display:grid;grid-template-columns:1fr 2fr;gap:60px;margin-bottom:40px}
.footer-brand{display:flex;align-items:center;gap:12px;font-size:1.2rem;font-weight:600}
.footer-brand img{border-radius:8px}
.footer-links{display:grid;grid-template-columns:repeat(3,1fr);gap:40px}
.footer-col h4{font-size:1rem;margin-bottom:20px;color:#fff}
.footer-col a{display:block;color:rgba(255,255,255,.7);padding:6px 0;transition:color .2s}
.footer-col a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:30px;text-align:center}
.footer-bottom p{color:rgba(255,255,255,.6);font-size:.9rem;margin-bottom:8px}
.back-top{position:fixed;right:24px;bottom:100px;width:48px;height:48px;background:var(--primary);color:#fff;border:none;border-radius:50%;cursor:pointer;opacity:0;visibility:hidden;transition:all .3s;box-shadow:0 4px 20px rgba(0,102,255,.3);z-index:999}
.back-top.show{opacity:1;visibility:visible}
.back-top:hover{transform:translateY(-3px);box-shadow:0 6px 24px rgba(0,102,255,.4)}
.float-contact{position:fixed;right:24px;bottom:30px;z-index:999}
.float-btn{display:flex;align-items:center;gap:8px;padding:14px 24px;background:linear-gradient(135deg,var(--primary),#4d94ff);color:#fff;border:none;border-radius:50px;cursor:pointer;box-shadow:0 4px 20px rgba(0,102,255,.4);transition:all .3s}
.float-btn:hover{transform:translateY(-3px);box-shadow:0 8px 30px rgba(0,102,255,.5)}
.float-btn span{font-weight:500}
@media (max-width:1024px){
.nav{display:none;position:absolute;top:70px;left:0;right:0;background:#fff;flex-direction:column;padding:20px;border-bottom:1px solid var(--border);box-shadow:0 10px 30px rgba(0,0,0,.1)}
.nav.active{display:flex}
.nav-toggle{display:flex}
.header-btn{display:none}
.hero h1{font-size:2.25rem}
.intro-grid{grid-template-columns:1fr;gap:40px}
.intro-main{order:1}
.intro-content{order:2}
.features-grid{grid-template-columns:1fr}
.download-grid{grid-template-columns:1fr}
.guide-content{grid-template-columns:1fr;gap:40px}
.guide-showcase{position:static;max-width:280px;margin:0 auto}
.faq-grid{grid-template-columns:1fr}
.security-grid{grid-template-columns:1fr}
.about-content{grid-template-columns:1fr;gap:40px}
.about-image{order:-1}
.footer-main{grid-template-columns:1fr;gap:40px;text-align:center}
.footer-brand{justify-content:center}
.footer-links{grid-template-columns:1fr;gap:30px}
}
@media (max-width:640px){
.container{padding:0 16px}
.header-inner{height:60px}
.hero{padding:100px 0 60px;min-height:auto}
.hero h1{font-size:1.75rem}
.hero-desc{font-size:1rem}
.hero-stats{flex-wrap:wrap;gap:24px}
.stat-item{flex:1 1 45%}
.section{padding:60px 0}
.section-title{font-size:1.5rem}
.section-desc{font-size:1rem}
.contact-box{padding:40px 24px}
.contact-box h2{font-size:1.5rem}
.back-top{right:16px;bottom:90px;width:44px;height:44px}
.float-contact{right:16px;bottom:24px}
.float-btn{padding:12px 20px}
.float-btn span{display:none}
.float-btn{border-radius:50%;width:52px;height:52px;padding:0;justify-content:center}
}