/* 360安全卫士 - 高性能版 */
*{margin:0;padding:0;box-sizing:border-box;}
:root{--primary:#00b894;--secondary:#00cec9;--accent:#55efc4;--text:#fff;--text-dim:rgba(255,255,255,0.7);--card-bg:#0a2e1a;--card-border:rgba(0,184,148,0.3);}
body{font-family:'Microsoft YaHei',-apple-system,sans-serif;min-height:100vh;color:var(--text);background:#051510;line-height:1.6;}

.bg-gradient{position:fixed;top:0;left:0;width:100%;height:100%;background:linear-gradient(135deg,#051510 0%,#0a2e1a 50%,#0d3b26 100%);z-index:0;}
.bg-gradient::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background:radial-gradient(ellipse at 30% 30%,rgba(0,184,148,0.12) 0%,transparent 50%),radial-gradient(ellipse at 70% 70%,rgba(0,206,201,0.1) 0%,transparent 50%);}

.main-header{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(5,21,16,0.95);border-bottom:1px solid var(--card-border);}
.header-content{max-width:1200px;margin:0 auto;padding:12px 20px;display:flex;justify-content:space-between;align-items:center;}
.site-logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);}
.logo-icon{font-size:28px;}
.logo-text{font-size:20px;font-weight:bold;}
.main-nav{display:flex;gap:8px;}
.nav-link{color:var(--text-dim);text-decoration:none;font-size:14px;padding:8px 16px;border-radius:8px;transition:all 0.2s;}
.nav-link:hover,.nav-link.active{color:var(--accent);background:rgba(0,184,148,0.15);}

.main-content{position:relative;z-index:1;}

.hero-section{display:flex;align-items:center;justify-content:center;min-height:80vh;padding:100px 20px;text-align:center;}
.hero-inner{max-width:700px;}
.logo-wrapper{width:120px;height:120px;margin:0 auto 30px;background:linear-gradient(135deg,var(--primary),var(--secondary));border-radius:28px;display:flex;align-items:center;justify-content:center;box-shadow:0 10px 40px rgba(0,184,148,0.3);}
.logo-icon{font-size:56px;}
h1{font-size:48px;font-weight:800;margin-bottom:15px;background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;}
.subtitle{font-size:18px;color:var(--text-dim);margin-bottom:8px;}
.hero-sub{font-size:14px;color:var(--text-dim);opacity:0.8;margin-bottom:25px;}
.hero-stats{display:flex;justify-content:center;gap:50px;margin-bottom:35px;}
.stat-item{text-align:center;}
.stat-num{display:block;font-size:30px;font-weight:bold;color:var(--accent);}
.stat-label{font-size:13px;color:var(--text-dim);}

.download-btn{display:inline-flex;align-items:center;gap:10px;padding:14px 36px;background:linear-gradient(135deg,var(--primary),var(--secondary));color:var(--text);text-decoration:none;border-radius:50px;font-size:16px;font-weight:600;transition:transform 0.2s,box-shadow 0.2s;box-shadow:0 6px 25px rgba(0,184,148,0.4);}
.download-btn:hover{transform:translateY(-2px);box-shadow:0 10px 35px rgba(0,184,148,0.5);}
.download-btn.large{padding:18px 48px;font-size:18px;}
.download-btn svg{width:18px;height:18px;}

.section-header{text-align:center;margin-bottom:50px;padding:0 20px;}
.section-header h2{font-size:32px;font-weight:bold;margin-bottom:10px;}
.section-desc{color:var(--text-dim);font-size:16px;}

/* 防护体系 */
.protect-section{padding:80px 20px;background:rgba(0,0,0,0.2);}
.protect-grid{max-width:900px;margin:0 auto;display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px;}
.protect-item{display:flex;gap:16px;background:var(--card-bg);border:1px solid var(--card-border);border-radius:12px;padding:24px;transition:border-color 0.2s;}
.protect-item:hover{border-color:var(--primary);}
.protect-num{width:40px;height:40px;background:linear-gradient(135deg,var(--primary),var(--secondary));border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:bold;flex-shrink:0;}
.protect-content h3{font-size:16px;margin-bottom:8px;}
.protect-content p{font-size:13px;color:var(--text-dim);}

/* 功能 */
.features-section{padding:80px 20px;}
.features-grid{max-width:1100px;margin:0 auto;display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:24px;}
.feature-item{background:var(--card-bg);border:1px solid var(--card-border);border-radius:16px;padding:28px;transition:border-color 0.2s,transform 0.2s;}
.feature-item:hover{border-color:var(--primary);transform:translateY(-3px);}
.feature-icon{font-size:36px;margin-bottom:15px;}
.feature-item h3{font-size:18px;margin-bottom:10px;}
.feature-item p{color:var(--text-dim);font-size:14px;margin-bottom:15px;}
.feature-list{list-style:none;font-size:13px;color:var(--text-dim);}
.feature-list li{padding:4px 0;padding-left:16px;position:relative;}
.feature-list li::before{content:'•';position:absolute;left:0;color:var(--accent);}

/* 技术 */
.tech-section{padding:80px 20px;background:rgba(0,0,0,0.2);}
.tech-grid{max-width:900px;margin:0 auto;display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:30px;}
.tech-item{background:var(--card-bg);border:1px solid var(--card-border);border-radius:12px;padding:30px;text-align:center;}
.tech-icon{font-size:40px;margin-bottom:15px;}
.tech-item h4{font-size:18px;margin-bottom:10px;}
.tech-item p{font-size:14px;color:var(--text-dim);}

/* 对比 */
.compare-section{padding:80px 20px;}
.compare-table{max-width:700px;margin:0 auto;background:var(--card-bg);border:1px solid var(--card-border);border-radius:12px;overflow:hidden;}
.comp-header,.comp-row{display:grid;grid-template-columns:2fr repeat(2,1fr);}
.comp-header{background:rgba(0,184,148,0.15);}
.comp-col{padding:14px 20px;font-size:14px;border-bottom:1px solid var(--card-border);}
.comp-col.highlight{color:var(--accent);font-weight:600;}
.comp-row:last-child .comp-col{border-bottom:none;}
.comp-row:hover{background:rgba(0,184,148,0.05);}

/* CTA */
.cta-section{padding:80px 20px;background:linear-gradient(135deg,rgba(0,184,148,0.2),rgba(0,206,201,0.2));}
.cta-content{text-align:center;max-width:600px;margin:0 auto;}
.cta-content h2{font-size:28px;margin-bottom:10px;}
.cta-content p{color:var(--text-dim);margin-bottom:25px;}

/* 下载页 */
.download-section{display:flex;align-items:center;justify-content:center;min-height:90vh;padding:100px 20px;}
.download-card{background:var(--card-bg);border:1px solid var(--card-border);border-radius:24px;padding:40px;max-width:500px;width:100%;text-align:center;}
.download-header{margin-bottom:25px;}
.download-header .subtitle{font-size:14px;margin-top:8px;}
.version-badge{display:inline-flex;align-items:center;gap:8px;background:rgba(0,184,148,0.2);padding:8px 20px;border-radius:20px;font-size:14px;color:var(--accent);margin-bottom:25px;}
.download-info-grid{display:grid;grid-template-columns:1fr 1fr;gap:15px;margin-bottom:25px;}
.info-card{background:rgba(0,0,0,0.2);border-radius:12px;padding:16px;display:flex;align-items:center;gap:12px;text-align:left;}
.info-icon{font-size:24px;}
.info-text{display:flex;flex-direction:column;}
.info-label{font-size:12px;color:var(--text-dim);}
.info-value{font-size:14px;font-weight:600;}
.download-features{background:rgba(0,0,0,0.2);border-radius:12px;padding:20px;margin-bottom:25px;text-align:left;}
.download-features h4{font-size:14px;margin-bottom:12px;}
.download-features ul{list-style:none;font-size:13px;color:var(--text-dim);display:grid;grid-template-columns:1fr 1fr;gap:8px;}
.download-actions{margin-bottom:25px;}
.download-note{font-size:12px;color:var(--text-dim);margin-top:12px;}
.download-methods h4{font-size:14px;color:var(--text-dim);margin-bottom:12px;}
.method-list{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;}
.method-item{background:rgba(255,255,255,0.05);padding:8px 16px;border-radius:8px;font-size:13px;color:var(--text-dim);text-decoration:none;transition:background 0.2s;}
.method-item:hover{background:rgba(255,255,255,0.1);}
.btn-back{display:inline-block;color:var(--text-dim);text-decoration:none;font-size:14px;margin-top:20px;}

/* 防护详情 */
.protect-detail-section{padding:60px 20px;max-width:900px;margin:0 auto;}
.protect-detail-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:20px;}
.protect-detail-item{background:var(--card-bg);border:1px solid var(--card-border);border-radius:12px;padding:20px;}
.protect-detail-item h4{font-size:15px;margin-bottom:8px;color:var(--accent);}
.protect-detail-item p{font-size:13px;color:var(--text-dim);}

/* FAQ */
.faq-section{padding:60px 20px;max-width:800px;margin:0 auto;}
.faq-list{display:flex;flex-direction:column;gap:16px;}
.faq-item{background:var(--card-bg);border:1px solid var(--card-border);border-radius:12px;padding:24px;}
.faq-item h4{font-size:15px;margin-bottom:10px;color:var(--accent);}
.faq-item p{font-size:14px;color:var(--text-dim);}

/* 404 */
.error-section{display:flex;align-items:center;justify-content:center;min-height:90vh;padding:100px 20px;}
.error-card{text-align:center;}
.error-icon{font-size:56px;margin-bottom:15px;}
.error-code{font-size:100px;font-weight:bold;background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;line-height:1;}
.error-card h1{font-size:26px;margin:15px 0 10px;}
.error-card p{color:var(--text-dim);margin-bottom:25px;}
.error-actions{display:flex;gap:15px;justify-content:center;}
.btn-secondary{display:inline-block;padding:14px 32px;background:transparent;color:var(--text);text-decoration:none;border-radius:50px;font-size:16px;border:2px solid var(--card-border);transition:border-color 0.2s;}
.btn-secondary:hover{border-color:var(--accent);}

/* 页脚 */
.main-footer{background:rgba(0,0,0,0.3);padding:40px 20px;text-align:center;border-top:1px solid var(--card-border);}
.footer-content{max-width:1200px;margin:0 auto;}
.footer-links{display:flex;gap:20px;justify-content:center;flex-wrap:wrap;margin-bottom:15px;}
.footer-links a{color:var(--text-dim);text-decoration:none;font-size:14px;}
.footer-links a:hover{color:var(--text);}
.main-footer p{font-size:13px;color:var(--text-dim);}

@media(max-width:768px){
    .header-content{flex-direction:column;gap:12px;}
    h1{font-size:36px;}
    .hero-stats{gap:30px;}
    .stat-num{font-size:24px;}
    .protect-grid{grid-template-columns:1fr;}
    .features-grid{grid-template-columns:1fr;}
    .compare-table{font-size:12px;}
    .comp-col{padding:10px 12px;}
    .tech-grid{grid-template-columns:1fr;}
    .download-info-grid{grid-template-columns:1fr;}
    .download-features ul{grid-template-columns:1fr;}
}