/* 51吃瓜官网主样式 - 深空黑+霓虹蓝紫渐变科技风格 */
:root {
  --primary: #00d4ff;
  --secondary: #7b2fff;
  --accent: #ff00aa;
  --bg-dark: #050a14;
  --bg-card: #0d1a2e;
  --bg-card2: #0a1525;
  --text-main: #e8f4ff;
  --text-muted: #7a9bb5;
  --border: rgba(0,212,255,0.18);
  --glow: 0 0 18px rgba(0,212,255,0.35);
  --glow2: 0 0 18px rgba(123,47,255,0.35);
  --radius: 12px;
  --transition: 0.3s cubic-bezier(.4,0,.2,1);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{background:var(--bg-dark);color:var(--text-main);font-family:'PingFang SC','Microsoft YaHei',sans-serif;line-height:1.7;overflow-x:hidden}
a{color:var(--primary);text-decoration:none;transition:color var(--transition)}
a:hover{color:#fff}
img{max-width:100%;height:auto;display:block}
ul{list-style:none}

/* 粒子背景 */
#particles-canvas{position:fixed;top:0;left:0;width:100%;height:100%;z-index:0;pointer-events:none;opacity:.45}

/* 布局 */
.container{max-width:1200px;margin:0 auto;padding:0 24px;position:relative;z-index:1}
.section{padding:80px 0}
.section-title{font-size:2rem;font-weight:700;text-align:center;margin-bottom:12px;background:linear-gradient(90deg,var(--primary),var(--secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.section-sub{text-align:center;color:var(--text-muted);margin-bottom:48px;font-size:1rem}

/* 导航 */
.navbar{position:sticky;top:0;z-index:999;background:rgba(5,10,20,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);padding:0}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.nav-logo{font-size:1.5rem;font-weight:800;background:linear-gradient(90deg,var(--primary),var(--secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;letter-spacing:2px}
.nav-menu{display:flex;gap:8px;align-items:center}
.nav-menu a{padding:6px 14px;border-radius:6px;font-size:.95rem;color:var(--text-muted);transition:all var(--transition)}
.nav-menu a:hover,.nav-menu a.active{color:var(--primary);background:rgba(0,212,255,.08)}
.nav-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:4px}
.nav-toggle span{width:24px;height:2px;background:var(--primary);border-radius:2px;transition:all var(--transition)}

/* 搜索框 */
.search-bar{background:rgba(5,10,20,.95);border-bottom:1px solid var(--border);padding:10px 0}
.search-inner{display:flex;align-items:center;gap:12px;max-width:600px;margin:0 auto;padding:0 24px}
.search-inner input{flex:1;background:rgba(0,212,255,.06);border:1px solid var(--border);border-radius:24px;padding:8px 20px;color:var(--text-main);font-size:.95rem;outline:none;transition:border-color var(--transition)}
.search-inner input:focus{border-color:var(--primary);box-shadow:var(--glow)}
.search-inner input::placeholder{color:var(--text-muted)}
.search-btn{background:linear-gradient(90deg,var(--primary),var(--secondary));border:none;border-radius:24px;padding:8px 22px;color:#fff;font-size:.95rem;cursor:pointer;transition:opacity var(--transition)}
.search-btn:hover{opacity:.85}

/* Banner */
.hero{min-height:90vh;display:flex;align-items:center;position:relative;overflow:hidden}
.hero-bg{position:absolute;inset:0;background-image:url('../images/banner.jpg');background-size:cover;background-position:center;z-index:0;filter:brightness(.45)}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(5,10,20,.85) 40%,rgba(123,47,255,.25) 100%);z-index:1}
.hero-content{position:relative;z-index:2;max-width:700px}
.hero-tag{display:inline-block;background:rgba(0,212,255,.12);border:1px solid var(--primary);border-radius:20px;padding:4px 16px;font-size:.85rem;color:var(--primary);margin-bottom:20px;letter-spacing:1px}
.hero h1{font-size:clamp(2rem,5vw,3.2rem);font-weight:800;line-height:1.2;margin-bottom:20px;color:#fff}
.hero h1 span{background:linear-gradient(90deg,var(--primary),var(--secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-desc{font-size:1.1rem;color:rgba(232,244,255,.8);margin-bottom:36px;max-width:560px}
.hero-btns{display:flex;gap:16px;flex-wrap:wrap}
.btn-primary{background:linear-gradient(90deg,var(--primary),var(--secondary));border:none;border-radius:8px;padding:12px 32px;color:#fff;font-size:1rem;font-weight:600;cursor:pointer;transition:all var(--transition);display:inline-block}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,212,255,.4);color:#fff}
.btn-outline{background:transparent;border:1.5px solid var(--primary);border-radius:8px;padding:12px 32px;color:var(--primary);font-size:1rem;font-weight:600;cursor:pointer;transition:all var(--transition);display:inline-block}
.btn-outline:hover{background:rgba(0,212,255,.1);color:#fff;border-color:#fff}
.hero-stats{display:flex;gap:40px;margin-top:48px;flex-wrap:wrap}
.stat-item .num{font-size:2rem;font-weight:800;color:var(--primary)}
.stat-item .label{font-size:.85rem;color:var(--text-muted)}

/* 产品矩阵 */
.products-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:24px}
.product-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:32px 28px;transition:all var(--transition);position:relative;overflow:hidden}
.product-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--primary),var(--secondary));opacity:0;transition:opacity var(--transition)}
.product-card:hover{transform:translateY(-6px);box-shadow:var(--glow);border-color:var(--primary)}
.product-card:hover::before{opacity:1}
.product-icon{width:56px;height:56px;border-radius:12px;background:linear-gradient(135deg,rgba(0,212,255,.15),rgba(123,47,255,.15));display:flex;align-items:center;justify-content:center;margin-bottom:20px;font-size:1.6rem}
.product-card h3{font-size:1.15rem;font-weight:700;margin-bottom:12px;color:#fff}
.product-card p{color:var(--text-muted);font-size:.95rem;line-height:1.7}
.product-img{width:100%;height:180px;object-fit:cover;border-radius:8px;margin-bottom:20px}

/* 技术引擎 */
.tech-section{background:linear-gradient(135deg,rgba(0,212,255,.04),rgba(123,47,255,.06))}
.tech-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:20px}
.tech-item{background:var(--bg-card2);border:1px solid var(--border);border-radius:var(--radius);padding:28px 22px;text-align:center;transition:all var(--transition)}
.tech-item:hover{border-color:var(--secondary);box-shadow:var(--glow2)}
.tech-item .icon{font-size:2.2rem;margin-bottom:14px}
.tech-item h4{font-size:1rem;font-weight:700;color:#fff;margin-bottom:8px}
.tech-item p{font-size:.88rem;color:var(--text-muted)}

/* 解决方案 */
.solution-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}
.solution-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:all var(--transition)}
.solution-card:hover{transform:translateY(-4px);box-shadow:var(--glow)}
.solution-img{width:100%;height:200px;object-fit:cover}
.solution-body{padding:24px}
.solution-tag{display:inline-block;background:rgba(0,212,255,.12);border-radius:4px;padding:2px 10px;font-size:.8rem;color:var(--primary);margin-bottom:10px}
.solution-body h3{font-size:1.05rem;font-weight:700;color:#fff;margin-bottom:8px}
.solution-body p{font-size:.9rem;color:var(--text-muted)}

/* 视频卡片 */
.video-section{background:var(--bg-card2)}
.video-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}
.video-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;cursor:pointer;transition:all var(--transition);position:relative}
.video-card:hover{transform:translateY(-4px);box-shadow:0 8px 32px rgba(0,212,255,.25)}
.video-thumb{position:relative;overflow:hidden}
.video-thumb img{width:100%;height:200px;object-fit:cover;transition:transform var(--transition)}
.video-card:hover .video-thumb img{transform:scale(1.05)}
.video-play-btn{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(5,10,20,.4);opacity:0;transition:opacity var(--transition)}
.video-card:hover .video-play-btn{opacity:1}
.play-icon{width:60px;height:60px;background:rgba(0,212,255,.9);border-radius:50%;display:flex;align-items:center;justify-content:center;transition:transform var(--transition)}
.video-card:hover .play-icon{transform:scale(1.1)}
.play-icon svg{width:24px;height:24px;fill:#fff;margin-left:4px}
.video-info{padding:18px}
.video-tag{display:inline-block;background:rgba(123,47,255,.15);border-radius:4px;padding:2px 8px;font-size:.78rem;color:var(--secondary);margin-bottom:8px}
.video-info h4{font-size:1rem;font-weight:700;color:#fff;margin-bottom:8px}
.video-meta{display:flex;gap:16px;font-size:.82rem;color:var(--text-muted)}
.video-meta span{display:flex;align-items:center;gap:4px}

/* 价值流程 */
.process-list{display:flex;gap:0;flex-wrap:wrap;justify-content:center;position:relative}
.process-list::before{content:'';position:absolute;top:40px;left:10%;right:10%;height:2px;background:linear-gradient(90deg,var(--primary),var(--secondary));opacity:.3;z-index:0}
.process-item{flex:1;min-width:160px;max-width:200px;text-align:center;padding:20px 12px;position:relative;z-index:1}
.process-num{width:64px;height:64px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--secondary));display:flex;align-items:center;justify-content:center;font-size:1.4rem;font-weight:800;color:#fff;margin:0 auto 16px;box-shadow:0 0 20px rgba(0,212,255,.4)}
.process-item h4{font-size:.95rem;font-weight:700;color:#fff;margin-bottom:6px}
.process-item p{font-size:.85rem;color:var(--text-muted)}

/* 案例 */
.cases-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(340px,1fr));gap:24px}
.case-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:28px;transition:all var(--transition)}
.case-card:hover{border-color:var(--primary);box-shadow:var(--glow)}
.case-logo{width:48px;height:48px;border-radius:10px;background:linear-gradient(135deg,var(--primary),var(--secondary));display:flex;align-items:center;justify-content:center;font-size:1.4rem;margin-bottom:16px}
.case-card h3{font-size:1.05rem;font-weight:700;color:#fff;margin-bottom:10px}
.case-card p{font-size:.9rem;color:var(--text-muted);line-height:1.7}
.case-result{margin-top:16px;padding-top:16px;border-top:1px solid var(--border);display:flex;gap:20px}
.case-result .metric{text-align:center}
.case-result .metric .val{font-size:1.4rem;font-weight:800;color:var(--primary)}
.case-result .metric .key{font-size:.8rem;color:var(--text-muted)}

/* 动态新闻 */
.news-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:24px}
.news-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:all var(--transition)}
.news-card:hover{transform:translateY(-4px);border-color:var(--primary)}
.news-img{width:100%;height:180px;object-fit:cover}
.news-body{padding:20px}
.news-date{font-size:.8rem;color:var(--text-muted);margin-bottom:8px}
.news-body h3{font-size:1rem;font-weight:700;color:#fff;margin-bottom:8px;line-height:1.5}
.news-body p{font-size:.88rem;color:var(--text-muted)}
.news-more{margin-top:12px;font-size:.88rem;color:var(--primary)}

/* 用户评价 */
.reviews-section{background:linear-gradient(135deg,rgba(0,212,255,.03),rgba(123,47,255,.05))}
.reviews-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px}
.review-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;transition:all var(--transition)}
.review-card:hover{border-color:var(--secondary);box-shadow:var(--glow2)}
.review-stars{color:#f5c518;font-size:1rem;margin-bottom:12px}
.review-text{font-size:.92rem;color:var(--text-muted);line-height:1.7;margin-bottom:16px}
.review-user{display:flex;align-items:center;gap:12px}
.review-avatar{width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--secondary));display:flex;align-items:center;justify-content:center;font-size:1rem;color:#fff;font-weight:700}
.review-name{font-size:.9rem;font-weight:600;color:#fff}
.review-role{font-size:.8rem;color:var(--text-muted)}

/* FAQ */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:12px;overflow:hidden;transition:border-color var(--transition)}
.faq-item.open{border-color:var(--primary)}
.faq-q{padding:20px 24px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;color:#fff;font-size:.98rem}
.faq-q .arrow{transition:transform var(--transition);color:var(--primary);font-size:1.2rem}
.faq-item.open .faq-q .arrow{transform:rotate(180deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .4s ease,padding .3s ease}
.faq-a-inner{padding:0 24px 20px;color:var(--text-muted);font-size:.93rem;line-height:1.8}
.faq-item.open .faq-a{max-height:300px}

/* 联系我们 */
.contact-section{background:var(--bg-card2)}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start}
.contact-info h3{font-size:1.5rem;font-weight:700;color:#fff;margin-bottom:20px}
.contact-item{display:flex;align-items:flex-start;gap:14px;margin-bottom:20px}
.contact-icon{width:44px;height:44px;border-radius:10px;background:rgba(0,212,255,.1);border:1px solid var(--border);display:flex;align-items:center;justify-content:center;font-size:1.2rem;flex-shrink:0}
.contact-item .label{font-size:.82rem;color:var(--text-muted);margin-bottom:2px}
.contact-item .value{font-size:.95rem;color:#fff}
.contact-form{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:32px}
.form-group{margin-bottom:20px}
.form-group label{display:block;font-size:.88rem;color:var(--text-muted);margin-bottom:8px}
.form-group input,.form-group textarea{width:100%;background:rgba(0,212,255,.04);border:1px solid var(--border);border-radius:8px;padding:12px 16px;color:var(--text-main);font-size:.95rem;outline:none;transition:border-color var(--transition);font-family:inherit}
.form-group input:focus,.form-group textarea:focus{border-color:var(--primary)}
.form-group textarea{height:120px;resize:vertical}

/* 页脚 */
.footer{background:rgba(5,10,20,.98);border-top:1px solid var(--border);padding:48px 0 24px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px}
.footer-brand .logo{font-size:1.4rem;font-weight:800;background:linear-gradient(90deg,var(--primary),var(--secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:12px}
.footer-brand p{font-size:.88rem;color:var(--text-muted);line-height:1.7}
.footer-col h4{font-size:.95rem;font-weight:700;color:#fff;margin-bottom:16px}
.footer-col ul li{margin-bottom:8px}
.footer-col ul li a{font-size:.88rem;color:var(--text-muted);transition:color var(--transition)}
.footer-col ul li a:hover{color:var(--primary)}
.footer-bottom{border-top:1px solid var(--border);padding-top:24px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px}
.footer-bottom p{font-size:.82rem;color:var(--text-muted)}
.footer-icp a{font-size:.82rem;color:var(--text-muted)}

/* 内页面包屑 */
.breadcrumb{padding:16px 0;font-size:.88rem;color:var(--text-muted)}
.breadcrumb a{color:var(--text-muted)}
.breadcrumb a:hover{color:var(--primary)}
.breadcrumb span{margin:0 8px;color:var(--border)}

/* 内页Hero */
.inner-hero{padding:60px 0;background:linear-gradient(135deg,rgba(0,212,255,.06),rgba(123,47,255,.08));border-bottom:1px solid var(--border)}
.inner-hero h1{font-size:2rem;font-weight:800;color:#fff;margin-bottom:12px}
.inner-hero p{color:var(--text-muted);max-width:600px}

/* 滚动动画 */
.fade-in{opacity:0;transform:translateY(30px);transition:opacity .6s ease,transform .6s ease}
.fade-in.visible{opacity:1;transform:none}

/* 响应式 */
@media(max-width:900px){
  .footer-grid{grid-template-columns:1fr 1fr}
  .contact-grid{grid-template-columns:1fr}
  .process-list::before{display:none}
}
@media(max-width:768px){
  .nav-menu{display:none;position:absolute;top:64px;left:0;right:0;background:rgba(5,10,20,.98);flex-direction:column;padding:16px;border-bottom:1px solid var(--border)}
  .nav-menu.open{display:flex}
  .nav-toggle{display:flex}
  .hero{min-height:70vh}
  .hero h1{font-size:1.8rem}
  .hero-stats{gap:24px}
  .section{padding:56px 0}
  .section-title{font-size:1.6rem}
  .footer-grid{grid-template-columns:1fr}
}
@media(max-width:480px){
  .hero-btns{flex-direction:column}
  .btn-primary,.btn-outline{text-align:center}
  .cases-grid{grid-template-columns:1fr}
}

/* 加载动画 */
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.5}}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}
@keyframes glow-pulse{0%,100%{box-shadow:0 0 10px rgba(0,212,255,.3)}50%{box-shadow:0 0 30px rgba(0,212,255,.7)}}
.float-anim{animation:float 4s ease-in-out infinite}