/* ========================================
   51吃瓜每日投稿 - 全站样式表
   nb-teli.com
   ======================================== */

/* Reset & Base */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;color:#333;line-height:1.7;background:#f8f9fa;-webkit-font-smoothing:antialiased}
a{color:#e74c3c;text-decoration:none;transition:color .3s}
a:hover{color:#c0392b}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
h1,h2,h3,h4,h5,h6{font-weight:700;line-height:1.3;color:#1a1a2e}

/* Container */
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.section{padding:60px 0}
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:2rem;margin-bottom:10px;position:relative;display:inline-block}
.section-title h2::after{content:"";display:block;width:60px;height:3px;background:linear-gradient(90deg,#e74c3c,#f39c12);margin:10px auto 0}
.section-title p{color:#666;font-size:1rem;max-width:600px;margin:0 auto}

/* Header */
.site-header{background:#1a1a2e;color:#fff;position:sticky;top:0;z-index:1000;box-shadow:0 2px 10px rgba(0,0,0,.15)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;max-width:1200px;margin:0 auto}
.logo{display:flex;align-items:center;gap:10px}
.logo img{height:42px;width:auto}
.logo span{font-size:1.2rem;font-weight:700;color:#fff;white-space:nowrap}
.main-nav{display:flex;align-items:center;gap:0}
.main-nav a{color:#ccc;padding:8px 14px;font-size:.9rem;transition:all .3s;border-radius:4px}
.main-nav a:hover,.main-nav a.active{color:#fff;background:rgba(231,76,60,.2)}
.nav-toggle{display:none;background:none;border:none;color:#fff;font-size:1.5rem;cursor:pointer}

/* Search Bar */
.search-bar{background:#16213e;padding:12px 0}
.search-bar .container{display:flex;justify-content:center}
.search-box{display:flex;max-width:600px;width:100%;background:#fff;border-radius:25px;overflow:hidden;box-shadow:0 2px 8px rgba(0,0,0,.1)}
.search-box input{flex:1;border:none;padding:10px 20px;font-size:.95rem;outline:none;color:#333}
.search-box button{background:linear-gradient(135deg,#e74c3c,#f39c12);color:#fff;border:none;padding:10px 25px;cursor:pointer;font-size:.9rem;transition:opacity .3s}
.search-box button:hover{opacity:.85}

/* Breadcrumb */
.breadcrumb{padding:12px 0;background:#fff;border-bottom:1px solid #eee;font-size:.85rem}
.breadcrumb a{color:#666}
.breadcrumb span{color:#999;margin:0 6px}
.breadcrumb em{font-style:normal;color:#e74c3c}

/* Hero Banner */
.hero-banner{position:relative;height:480px;overflow:hidden;background:#1a1a2e}
.hero-banner img{width:100%;height:100%;object-fit:cover;opacity:.6}
.hero-overlay{position:absolute;top:0;left:0;right:0;bottom:0;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:20px}
.hero-overlay h1{color:#fff;font-size:2.5rem;margin-bottom:15px;text-shadow:2px 2px 8px rgba(0,0,0,.5)}
.hero-overlay p{color:#ddd;font-size:1.1rem;max-width:700px;margin-bottom:25px}
.hero-btn{display:inline-block;background:linear-gradient(135deg,#e74c3c,#f39c12);color:#fff;padding:12px 35px;border-radius:25px;font-size:1rem;font-weight:600;transition:transform .3s,box-shadow .3s}
.hero-btn:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(231,76,60,.4);color:#fff}

/* Video Card Grid */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.video-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 2px 12px rgba(0,0,0,.08);transition:transform .3s,box-shadow .3s}
.video-card:hover{transform:translateY(-5px);box-shadow:0 8px 25px rgba(0,0,0,.15)}
.video-thumb{position:relative;padding-top:56.25%;overflow:hidden;background:#000}
.video-thumb img{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover;transition:transform .3s}
.video-card:hover .video-thumb img{transform:scale(1.05)}
.play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:56px;height:56px;background:rgba(231,76,60,.9);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s}
.play-btn::after{content:"";width:0;height:0;border-left:20px solid #fff;border-top:12px solid transparent;border-bottom:12px solid transparent;margin-left:4px}
.video-card:hover .play-btn{opacity:1}
.video-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.75);color:#fff;padding:2px 8px;border-radius:3px;font-size:.75rem}
.video-info{padding:14px}
.video-info h3{font-size:.95rem;margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;gap:12px;color:#999;font-size:.8rem}
.video-meta span{display:flex;align-items:center;gap:3px}
.video-tags{display:flex;gap:6px;margin-top:8px;flex-wrap:wrap}
.video-tags span{background:#f0f0f0;color:#666;padding:2px 10px;border-radius:12px;font-size:.75rem}

/* Module Cards */
.module-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}
.module-card{background:#fff;border-radius:12px;padding:30px 24px;text-align:center;box-shadow:0 2px 12px rgba(0,0,0,.06);transition:transform .3s}
.module-card:hover{transform:translateY(-4px)}
.module-icon{width:64px;height:64px;margin:0 auto 16px;background:linear-gradient(135deg,#e74c3c,#f39c12);border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:1.8rem;color:#fff}
.module-card h3{font-size:1.1rem;margin-bottom:8px}
.module-card p{color:#666;font-size:.9rem;line-height:1.6}

/* Expert Section */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}
.expert-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 2px 12px rgba(0,0,0,.06);text-align:center;padding:30px 20px;transition:transform .3s}
.expert-card:hover{transform:translateY(-4px)}
.expert-avatar{width:100px;height:100px;border-radius:50%;margin:0 auto 16px;overflow:hidden;border:3px solid #e74c3c}
.expert-avatar img{width:100%;height:100%;object-fit:cover}
.expert-card h3{font-size:1.05rem;margin-bottom:4px}
.expert-card .title{color:#e74c3c;font-size:.85rem;margin-bottom:10px}
.expert-card p{color:#666;font-size:.85rem;line-height:1.6;margin-bottom:14px}
.expert-links{display:flex;gap:10px;justify-content:center}
.expert-links a{padding:6px 16px;border-radius:20px;font-size:.8rem;border:1px solid #e74c3c;color:#e74c3c;transition:all .3s}
.expert-links a:hover{background:#e74c3c;color:#fff}

/* Partners */
.partner-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:30px;align-items:center}
.partner-wall .partner-item{background:#fff;padding:20px 30px;border-radius:10px;box-shadow:0 2px 8px rgba(0,0,0,.06);font-size:1rem;font-weight:600;color:#555;transition:transform .3s}
.partner-wall .partner-item:hover{transform:scale(1.05)}

/* How-To Guide */
.howto-steps{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:24px;counter-reset:step}
.howto-step{background:#fff;border-radius:12px;padding:30px 24px;text-align:center;box-shadow:0 2px 12px rgba(0,0,0,.06);position:relative;counter-increment:step}
.howto-step::before{content:counter(step);position:absolute;top:-15px;left:50%;transform:translateX(-50%);width:36px;height:36px;background:linear-gradient(135deg,#e74c3c,#f39c12);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1rem}
.howto-step h4{margin-top:10px;margin-bottom:8px;font-size:1rem}
.howto-step p{color:#666;font-size:.88rem}

/* FAQ */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#fff;border-radius:10px;margin-bottom:12px;box-shadow:0 1px 6px rgba(0,0,0,.05);overflow:hidden}
.faq-question{padding:16px 20px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;transition:background .3s}
.faq-question:hover{background:#fafafa}
.faq-question::after{content:"+";font-size:1.3rem;color:#e74c3c;transition:transform .3s}
.faq-item.active .faq-question::after{transform:rotate(45deg)}
.faq-answer{padding:0 20px;max-height:0;overflow:hidden;transition:all .3s ease;color:#666;font-size:.92rem;line-height:1.7}
.faq-item.active .faq-answer{padding:0 20px 16px;max-height:500px}

/* Reviews */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}
.review-card{background:#fff;border-radius:12px;padding:24px;box-shadow:0 2px 10px rgba(0,0,0,.06)}
.review-header{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.review-avatar{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,#e74c3c,#f39c12);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:1.1rem}
.review-name{font-weight:600;font-size:.95rem}
.review-date{color:#999;font-size:.8rem}
.review-stars{color:#f39c12;margin-bottom:8px;font-size:.9rem}
.review-text{color:#555;font-size:.9rem;line-height:1.7}

/* Contact Section */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.contact-card{background:#fff;border-radius:12px;padding:24px;box-shadow:0 2px 10px rgba(0,0,0,.06);text-align:center}
.contact-card h4{margin-bottom:12px;color:#1a1a2e}
.contact-card p{color:#666;font-size:.9rem;line-height:1.7}
.contact-card img{max-width:160px;margin:10px auto}

/* Social Share */
.share-bar{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:20px}
.share-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 18px;border-radius:20px;color:#fff;font-size:.85rem;transition:opacity .3s}
.share-btn:hover{opacity:.85;color:#fff}
.share-btn.wechat{background:#07c160}
.share-btn.weibo{background:#e6162d}
.share-btn.douyin{background:#161823}
.share-btn.bilibili{background:#00a1d6}

/* Footer */
.site-footer{background:#1a1a2e;color:#aaa;padding:40px 0 20px}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:30px;margin-bottom:30px}
.footer-col h4{color:#fff;margin-bottom:14px;font-size:1rem}
.footer-col p,.footer-col a{color:#aaa;font-size:.88rem;line-height:1.8}
.footer-col a:hover{color:#e74c3c}
.footer-col img{max-width:120px;margin-top:8px;border-radius:6px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:20px;text-align:center;font-size:.82rem}
.footer-bottom p{margin-bottom:4px}

/* Tags Section */
.tag-cloud{display:flex;flex-wrap:wrap;gap:8px;justify-content:center}
.tag-cloud a{background:#f0f0f0;color:#555;padding:5px 14px;border-radius:16px;font-size:.82rem;transition:all .3s}
.tag-cloud a:hover{background:#e74c3c;color:#fff}

/* Utility */
.text-center{text-align:center}
.mt-20{margin-top:20px}
.mb-20{margin-bottom:20px}
.bg-white{background:#fff}
.bg-light{background:#f8f9fa}
.bg-dark{background:#1a1a2e}

/* Scene Image Section */
.scene-banner{position:relative;height:300px;overflow:hidden}
.scene-banner img{width:100%;height:100%;object-fit:cover}
.scene-banner .overlay{position:absolute;top:0;left:0;right:0;bottom:0;background:linear-gradient(transparent,rgba(26,26,46,.7));display:flex;align-items:flex-end;padding:30px}
.scene-banner .overlay h2{color:#fff;font-size:1.8rem}

/* Content Article */
.article-content{background:#fff;border-radius:12px;padding:30px;box-shadow:0 2px 10px rgba(0,0,0,.06);margin-bottom:24px}
.article-content h2,.article-content h3{margin:20px 0 12px;color:#1a1a2e}
.article-content p{margin-bottom:14px;color:#555;line-height:1.8}

/* Responsive */
@media(max-width:768px){
  .header-inner{flex-wrap:wrap}
  .main-nav{display:none;width:100%;flex-direction:column;padding-top:10px}
  .main-nav.active{display:flex}
  .nav-toggle{display:block}
  .hero-banner{height:320px}
  .hero-overlay h1{font-size:1.6rem}
  .hero-overlay p{font-size:.9rem}
  .section{padding:40px 0}
  .section-title h2{font-size:1.5rem}
  .video-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}
  .footer-grid{grid-template-columns:1fr 1fr}
  .search-box{max-width:100%}
}
@media(max-width:480px){
  .video-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:1fr}
  .module-grid{grid-template-columns:1fr}
}