*{margin:0;padding:0;box-sizing:border-box;font-family:'PingFang SC','Microsoft YaHei',sans-serif}
body{background:#f5f5f5;color:#333;line-height:1.6;transition:background 0.3s,color 0.3s}
a{color:#e74c3c;text-decoration:none;transition:color 0.3s}
a:hover{color:#c0392b}
.container{max-width:1200px;margin:0 auto;padding:0 20px}
/* 导航 */
.navbar{background:#1a1a2e;color:#fff;padding:15px 0;position:sticky;top:0;z-index:1000;box-shadow:0 2px 10px rgba(0,0,0,0.3);transition:box-shadow 0.3s}
.navbar .container{display:flex;justify-content:space-between;align-items:center}
.logo{font-size:28px;font-weight:700;color:#e74c3c}
.logo span{color:#fff}
.nav-links{display:flex;gap:25px;list-style:none}
.nav-links li a{color:#ddd;font-size:16px;transition:color 0.3s}
.nav-links li a:hover{color:#e74c3c}
.menu-toggle{display:none;background:transparent;border:1px solid #fff;color:#fff;padding:8px 12px;border-radius:4px;cursor:pointer}
@media(max-width:768px){
.nav-links{display:none;flex-direction:column;background:#1a1a2e;position:absolute;top:60px;left:0;width:100%;padding:20px;gap:15px}
.nav-links.active{display:flex}
.menu-toggle{display:block}
}
/* 面包屑 */
.breadcrumb{background:#fff;padding:12px 0;border-bottom:1px solid #eee;font-size:14px;transition:background 0.3s,color 0.3s}
.breadcrumb a{color:#666}
.breadcrumb span{color:#999}
/* Banner轮播 */
.banner{position:relative;overflow:hidden;height:420px;background:linear-gradient(135deg,#1a1a2e,#16213e,#0f3460);transition:background 0.3s}
.banner-slide{position:absolute;width:100%;height:100%;display:flex;align-items:center;justify-content:center;color:#fff;text-align:center;opacity:0;transition:opacity 1s}
.banner-slide.active{opacity:1}
.banner-slide h1{font-size:42px;margin-bottom:15px;text-shadow:0 2px 8px rgba(0,0,0,0.5)}
.banner-slide p{font-size:20px;max-width:700px;margin:0 auto;opacity:0.9}
.banner-dots{position:absolute;bottom:20px;left:50%;transform:translateX(-50%);display:flex;gap:12px}
.banner-dots span{width:14px;height:14px;border-radius:50%;background:rgba(255,255,255,0.4);cursor:pointer;transition:0.3s}
.banner-dots span.active{background:#e74c3c}
@media(max-width:768px){
.banner{height:300px}
.banner-slide h1{font-size:28px}
.banner-slide p{font-size:16px}
}
/* 通用区块 */
.section{padding:60px 0}
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:32px;color:#1a1a2e;margin-bottom:10px;transition:color 0.3s}
.section-title p{color:#666;font-size:16px;transition:color 0.3s}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:30px}
.grid-3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:30px}
.grid-4{display:grid;grid-template-columns:1fr 1fr 1fr 1fr;gap:20px}
@media(max-width:768px){
.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
}
.card{background:rgba(255,255,255,0.7);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-radius:12px;padding:25px;box-shadow:0 2px 15px rgba(0,0,0,0.06);transition:0.3s}
.card:hover{transform:translateY(-5px);box-shadow:0 6px 25px rgba(0,0,0,0.1)}
.card h3{color:#1a1a2e;margin-bottom:10px;font-size:20px;transition:color 0.3s}
.card p{color:#555;font-size:15px;transition:color 0.3s}
.card .icon{width:50px;height:50px;margin-bottom:15px;fill:#e74c3c}
/* 关于我们 */
.about{background:#fff;transition:background 0.3s}
.about-content{display:flex;gap:40px;align-items:center}
.about-text{flex:1}
.about-text h2{font-size:28px;color:#1a1a2e;margin-bottom:15px;transition:color 0.3s}
.about-text p{margin-bottom:12px;color:#444;transition:color 0.3s}
.about-image{flex:1;text-align:center}
.about-image svg{max-width:100%;height:auto}
@media(max-width:768px){
.about-content{flex-direction:column}
}
/* 产品优势 */
.advantages{background:#f9f9f9;transition:background 0.3s}
/* 解决方案 */
.solutions{background:#fff;transition:background 0.3s}
.solution-item{border-left:4px solid #e74c3c;padding:15px 20px;margin-bottom:15px;background:#fafafa;border-radius:0 8px 8px 0;transition:background 0.3s}
.solution-item h4{color:#1a1a2e;margin-bottom:5px}
/* 案例 */
.cases{background:#f9f9f9;transition:background 0.3s}
.case-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 2px 10px rgba(0,0,0,0.05);transition:0.3s}
.case-card:hover{transform:translateY(-5px);box-shadow:0 6px 25px rgba(0,0,0,0.1)}
.case-card img{width:100%;height:200px;object-fit:cover}
.case-card .case-info{padding:20px}
.case-card h4{color:#1a1a2e;margin-bottom:8px}
/* 文章列表 */
.articles{background:#fff;transition:background 0.3s}
.article-item{display:flex;gap:20px;padding:20px 0;border-bottom:1px solid #eee;transition:border-color 0.3s}
.article-item:last-child{border-bottom:none}
.article-item .thumb{flex-shrink:0;width:120px;height:90px;background:#e0e0e0;border-radius:8px;display:flex;align-items:center;justify-content:center;color:#999;font-size:12px}
.article-item .info{flex:1}
.article-item .info h4{font-size:18px;color:#1a1a2e;margin-bottom:6px;transition:color 0.3s}
.article-item .info .meta{color:#999;font-size:13px;margin-bottom:6px}
.article-item .info p{color:#555;font-size:14px;transition:color 0.3s}
@media(max-width:768px){
.article-item{flex-direction:column}
.article-item .thumb{width:100%;height:150px}
}
/* FAQ */
.faq{background:#f9f9f9;transition:background 0.3s}
.faq-item{border-bottom:1px solid #ddd;padding:18px 0;transition:border-color 0.3s}
.faq-question{display:flex;justify-content:space-between;align-items:center;cursor:pointer;font-weight:600;color:#1a1a2e;font-size:17px;transition:color 0.3s}
.faq-question .arrow{transition:0.3s;color:#e74c3c}
.faq-item.open .faq-question .arrow{transform:rotate(180deg)}
.faq-answer{max-height:0;overflow:hidden;transition:0.4s;color:#444;padding-top:10px;line-height:1.7}
.faq-item.open .faq-answer{max-height:400px}
/* HowTo */
.howto{background:#fff;transition:background 0.3s}
.howto-steps{list-style:none;counter-reset:step}
.howto-steps li{counter-increment:step;padding:15px 0 15px 50px;position:relative;border-left:3px solid #e74c3c;margin-bottom:5px;padding-left:45px}
.howto-steps li::before{content:counter(step);position:absolute;left:-15px;top:10px;width:34px;height:34px;background:#e74c3c;color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:16px}
.howto-steps li strong{display:block;color:#1a1a2e;margin-bottom:5px;transition:color 0.3s}
/* 联系 */
.contact{background:linear-gradient(135deg,#1a1a2e,#16213e);color:#fff;padding:50px 0;transition:background 0.3s}
.contact .grid-3{color:#ddd}
.contact h3{color:#e74c3c;margin-bottom:15px;font-size:20px}
.contact p{margin-bottom:8px}
/* 底部 */
.footer{background:#111;color:#aaa;padding:40px 0 20px;font-size:14px}
.footer .container{display:flex;flex-wrap:wrap;justify-content:space-between;gap:20px}
.footer .col{flex:1;min-width:180px}
.footer h4{color:#fff;margin-bottom:12px;font-size:16px}
.footer ul{list-style:none}
.footer ul li{margin-bottom:6px}
.footer ul li a{color:#aaa;transition:color 0.3s}
.footer ul li a:hover{color:#e74c3c}
.footer .copyright{width:100%;text-align:center;padding-top:20px;border-top:1px solid #333;margin-top:20px}
/* 返回顶部 */
.back-top{position:fixed;bottom:30px;right:30px;width:45px;height:45px;background:#e74c3c;color:#fff;border:none;border-radius:50%;font-size:22px;cursor:pointer;display:none;z-index:999;box-shadow:0 2px 10px rgba(0,0,0,0.3);transition:0.3s}
.back-top.show{display:block}
.back-top:hover{transform:scale(1.1)}
/* 暗黑模式 */
.dark-mode{background:#1a1a2e;color:#eee}
.dark-mode .card{background:rgba(42,42,62,0.7);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);color:#ddd}
.dark-mode .navbar{background:#0d0d1a}
.dark-mode .breadcrumb{background:#222;color:#ccc}
.dark-mode .about{background:#222}
.dark-mode .solutions{background:#222}
.dark-mode .articles{background:#222}
.dark-mode .article-item{border-color:#333}
.dark-mode .faq{background:#222}
.dark-mode .faq-item{border-color:#444}
.dark-mode .howto{background:#222}
.dark-mode .cases{background:#222}
.dark-mode .advantages{background:#222}
.dark-mode .section-title h2{color:#eee}
.dark-mode .section-title p{color:#bbb}
.dark-mode .card h3{color:#eee}
.dark-mode .card p{color:#ccc}
.dark-mode .solution-item{background:rgba(42,42,62,0.7);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}
.dark-mode .footer{background:#0a0a15}
.dark-mode .banner{background:linear-gradient(135deg,#0d0d1a,#16213e,#0f3460)}
.dark-mode .contact{background:linear-gradient(135deg,#0d0d1a,#16213e)}
.dark-mode .about-text p{color:#ccc}
.dark-mode .article-item .info h4{color:#eee}
.dark-mode .article-item .info p{color:#ccc}
.dark-mode .faq-question{color:#eee}
.dark-mode .faq-answer{color:#ccc}
.dark-mode .howto-steps li strong{color:#eee}
/* 数字动画 */
.stat-number{font-size:36px;font-weight:700;color:#e74c3c;display:inline-block}
/* 滚动动画 */
.fade-in{opacity:0;transform:translateY(30px);transition:opacity 0.8s,transform 0.8s}
.fade-in.visible{opacity:1;transform:translateY(0)}
/* 搜索 */
.search-box{display:flex;gap:8px;max-width:500px;margin:0 auto 30px}
.search-box input{flex:1;padding:12px 18px;border:2px solid #ddd;border-radius:30px;font-size:16px;outline:none;transition:0.3s}
.search-box input:focus{border-color:#e74c3c}
.search-box button{padding:12px 25px;background:#e74c3c;color:#fff;border:none;border-radius:30px;cursor:pointer;font-size:16px;transition:0.3s}
.search-box button:hover{background:#c0392b}
/* 暗黑模式切换 */
.dark-toggle{background:transparent;border:1px solid #fff;color:#fff;padding:6px 12px;border-radius:20px;cursor:pointer;font-size:14px;transition:0.3s}
.dark-toggle:hover{background:rgba(255,255,255,0.1)}
/* 图片懒加载占位 */
.lazy-placeholder{background:#e0e0e0;border-radius:8px;display:flex;align-items:center;justify-content:center;color:#999;font-size:14px;min-height:100px}