/* ===== 51吃瓜每日投稿 - 全站样式 ===== */
/* 重置与基础 */
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",Arial,sans-serif;color:#333;background:#f8f9fa;line-height:1.7}
a{text-decoration:none;color:#e74c3c;transition:color .3s}
a:hover{color:#c0392b}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}

/* 容器 */
.container{max-width:1200px;margin:0 auto;padding:0 15px}

/* ===== 头部导航 ===== */
.site-header{background:#1a1a2e;position:sticky;top:0;z-index:1000;box-shadow:0 2px 10px rgba(0,0,0,.3)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:10px 15px;max-width:1200px;margin:0 auto}
.logo-area{display:flex;align-items:center;gap:10px}
.logo-area img{height:45px;width:auto}
.logo-area h1{font-size:20px;color:#fff;font-weight:700;white-space:nowrap}
.logo-area h1 span{color:#e74c3c}

/* 导航菜单 */
.main-nav ul{display:flex;gap:5px}
.main-nav a{color:#ddd;padding:8px 14px;border-radius:4px;font-size:15px;transition:all .3s}
.main-nav a:hover,.main-nav a.active{background:#e74c3c;color:#fff}

/* 搜索框 */
.search-bar{background:#16213e;padding:10px 0}
.search-bar .container{display:flex;justify-content:center}
.search-box{display:flex;max-width:600px;width:100%;border-radius:25px;overflow:hidden;box-shadow:0 2px 8px rgba(0,0,0,.2)}
.search-box input{flex:1;padding:10px 20px;border:none;font-size:15px;outline:none;background:#fff}
.search-box button{background:#e74c3c;color:#fff;border:none;padding:10px 25px;cursor:pointer;font-size:15px;transition:background .3s}
.search-box button:hover{background:#c0392b}

/* 面包屑 */
.breadcrumb{padding:12px 0;font-size:13px;color:#888}
.breadcrumb a{color:#e74c3c}
.breadcrumb span{margin:0 5px;color:#ccc}

/* ===== Banner ===== */
.hero-banner{position:relative;overflow:hidden;max-height:450px}
.hero-banner img{width:100%;object-fit:cover;min-height:300px}
.hero-overlay{position:absolute;top:0;left:0;right:0;bottom:0;background:linear-gradient(to right,rgba(26,26,46,.85) 0%,rgba(26,26,46,.4) 60%,transparent 100%);display:flex;align-items:center}
.hero-content{max-width:1200px;margin:0 auto;padding:0 40px;color:#fff}
.hero-content h2{font-size:36px;margin-bottom:12px;text-shadow:2px 2px 4px rgba(0,0,0,.5)}
.hero-content p{font-size:18px;margin-bottom:20px;opacity:.9;max-width:500px}
.btn-primary{display:inline-block;background:#e74c3c;color:#fff;padding:12px 30px;border-radius:25px;font-size:16px;font-weight:600;transition:all .3s;border:none;cursor:pointer}
.btn-primary:hover{background:#c0392b;color:#fff;transform:translateY(-2px);box-shadow:0 4px 15px rgba(231,76,60,.4)}
.btn-outline{display:inline-block;border:2px solid #fff;color:#fff;padding:10px 28px;border-radius:25px;font-size:16px;transition:all .3s;margin-left:12px}
.btn-outline:hover{background:#fff;color:#1a1a2e}

/* ===== 通用区块 ===== */
.section{padding:50px 0}
.section-alt{background:#fff}
.section-dark{background:#1a1a2e;color:#fff}
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:28px;color:#1a1a2e;position:relative;display:inline-block;padding-bottom:12px}
.section-title h2::after{content:'';position:absolute;bottom:0;left:50%;transform:translateX(-50%);width:60px;height:3px;background:#e74c3c;border-radius:2px}
.section-dark .section-title h2{color:#fff}
.section-title p{color:#777;margin-top:10px;font-size:15px}
.section-dark .section-title p{color:#aaa}

/* ===== 视频卡片 ===== */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}
.video-card{background:#fff;border-radius:10px;overflow:hidden;box-shadow:0 3px 15px rgba(0,0,0,.08);transition:all .3s;position:relative}
.video-card:hover{transform:translateY(-5px);box-shadow:0 8px 25px rgba(0,0,0,.15)}
.video-thumb{position:relative;overflow:hidden;aspect-ratio:16/9}
.video-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.video-card:hover .video-thumb img{transform:scale(1.05)}
.play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:60px;height:60px;background:rgba(231,76,60,.9);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s;cursor:pointer}
.video-card:hover .play-btn{opacity:1}
.play-btn::after{content:'';width:0;height:0;border-style:solid;border-width:12px 0 12px 20px;border-color:transparent transparent transparent #fff;margin-left:4px}
.video-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.75);color:#fff;padding:2px 8px;border-radius:3px;font-size:12px}
.video-info{padding:14px}
.video-info h3{font-size:15px;color:#333;margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;line-height:1.4}
.video-meta{display:flex;justify-content:space-between;font-size:12px;color:#999}
.video-meta .views{display:flex;align-items:center;gap:4px}
.video-stats{display:flex;gap:12px;font-size:12px;color:#999;margin-top:6px}
.video-stats span{display:flex;align-items:center;gap:3px}
.video-tag{display:inline-block;background:#fef0ef;color:#e74c3c;padding:2px 8px;border-radius:3px;font-size:11px;margin-top:6px}

/* ===== 专家卡片 ===== */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:25px}
.expert-card{background:#fff;border-radius:10px;padding:25px;text-align:center;box-shadow:0 3px 15px rgba(0,0,0,.08);transition:all .3s}
.expert-card:hover{transform:translateY(-5px);box-shadow:0 8px 25px rgba(0,0,0,.12)}
.expert-card img{width:100px;height:100px;border-radius:50%;object-fit:cover;margin:0 auto 15px;border:3px solid #e74c3c}
.expert-card h4{font-size:18px;color:#1a1a2e;margin-bottom:4px}
.expert-card .role{color:#e74c3c;font-size:13px;margin-bottom:10px}
.expert-card p{font-size:13px;color:#666;line-height:1.6;margin-bottom:12px}
.expert-card .btn-sm{display:inline-block;padding:6px 16px;border:1px solid #e74c3c;color:#e74c3c;border-radius:20px;font-size:13px;transition:all .3s;margin:3px}
.expert-card .btn-sm:hover{background:#e74c3c;color:#fff}

/* ===== FAQ ===== */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#fff;border-radius:8px;margin-bottom:12px;box-shadow:0 2px 8px rgba(0,0,0,.06);overflow:hidden}
.faq-question{padding:16px 20px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;color:#1a1a2e;transition:background .3s}
.faq-question:hover{background:#fef0ef}
.faq-question::after{content:'+';font-size:22px;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 .4s ease;color:#555;font-size:14px;line-height:1.8}
.faq-item.active .faq-answer{padding:0 20px 16px;max-height:500px}

/* ===== 用户评论 ===== */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}
.review-card{background:#fff;border-radius:10px;padding:20px;box-shadow:0 3px 15px rgba(0,0,0,.06)}
.review-header{display:flex;align-items:center;gap:10px;margin-bottom:12px}
.review-avatar{width:45px;height:45px;border-radius:50%;background:#e74c3c;display:flex;align-items:center;justify-content:center;color:#fff;font-size:18px;font-weight:700}
.review-name{font-weight:600;color:#1a1a2e;font-size:15px}
.review-date{font-size:12px;color:#999}
.review-stars{color:#f39c12;font-size:14px;margin-bottom:8px}
.review-text{font-size:14px;color:#555;line-height:1.7}

/* ===== 合作品牌 ===== */
.partner-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:30px;align-items:center}
.partner-wall .partner-item{background:#fff;padding:15px 25px;border-radius:8px;box-shadow:0 2px 8px rgba(0,0,0,.06);font-size:16px;font-weight:600;color:#555;transition:all .3s}
.partner-wall .partner-item:hover{box-shadow:0 4px 15px rgba(0,0,0,.12);color:#e74c3c}

/* ===== How-To指南 ===== */
.howto-steps{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:20px;margin-top:20px}
.howto-step{background:#fff;border-radius:10px;padding:25px;text-align:center;box-shadow:0 3px 12px rgba(0,0,0,.06);position:relative}
.step-num{width:40px;height:40px;background:#e74c3c;color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:700;margin:0 auto 12px}
.howto-step h4{font-size:16px;color:#1a1a2e;margin-bottom:8px}
.howto-step p{font-size:13px;color:#666}

/* ===== 联系我们 ===== */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:25px}
.contact-card{background:#fff;border-radius:10px;padding:25px;box-shadow:0 3px 12px rgba(0,0,0,.06)}
.contact-card h4{font-size:18px;color:#1a1a2e;margin-bottom:12px;padding-bottom:10px;border-bottom:2px solid #f0f0f0}
.contact-item{display:flex;align-items:flex-start;gap:10px;margin-bottom:10px;font-size:14px;color:#555}
.contact-item strong{color:#1a1a2e;min-width:70px}

/* ===== 社交分享 ===== */
.share-btns{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}
.share-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 18px;border-radius:20px;color:#fff;font-size:14px;transition:all .3s;cursor:pointer}
.share-btn:hover{transform:translateY(-2px);color:#fff}
.share-wechat{background:#07c160}
.share-weibo{background:#e6162d}
.share-douyin{background:#161823}
.share-bilibili{background:#00a1d6}

/* ===== 页脚 ===== */
.site-footer{background:#0f0f23;color:#aaa;padding:40px 0 0}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:30px;margin-bottom:30px}
.footer-col h4{color:#fff;font-size:16px;margin-bottom:15px;position:relative;padding-bottom:8px}
.footer-col h4::after{content:'';position:absolute;bottom:0;left:0;width:30px;height:2px;background:#e74c3c}
.footer-col p{font-size:13px;line-height:1.8;margin-bottom:8px}
.footer-col a{color:#aaa;font-size:13px;display:block;padding:3px 0;transition:color .3s}
.footer-col a:hover{color:#e74c3c}
.footer-col img{max-width:120px;border-radius:6px;margin-top:8px}
.footer-bottom{border-top:1px solid #222;padding:15px 0;text-align:center;font-size:13px}
.footer-bottom p{margin-bottom:4px}

/* ===== 内页通用 ===== */
.page-hero{background:#1a1a2e;padding:40px 0;text-align:center;color:#fff}
.page-hero h2{font-size:30px;margin-bottom:8px}
.page-hero p{font-size:15px;opacity:.8}
.content-section{padding:40px 0}
.content-section h3{font-size:22px;color:#1a1a2e;margin-bottom:15px}
.content-section p{font-size:15px;color:#555;line-height:1.8;margin-bottom:15px}
.tag-list{display:flex;flex-wrap:wrap;gap:8px;margin:15px 0}
.tag-list span{background:#fef0ef;color:#e74c3c;padding:4px 12px;border-radius:15px;font-size:12px}

/* ===== 功能模块卡片 ===== */
.feature-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:20px}
.feature-card{background:#fff;border-radius:10px;padding:25px;text-align:center;box-shadow:0 3px 12px rgba(0,0,0,.06);transition:all .3s}
.feature-card:hover{transform:translateY(-5px);box-shadow:0 8px 20px rgba(0,0,0,.12)}
.feature-icon{font-size:40px;margin-bottom:12px}
.feature-card h4{font-size:17px;color:#1a1a2e;margin-bottom:8px}
.feature-card p{font-size:13px;color:#666;line-height:1.6}

/* ===== 响应式 ===== */
@media(max-width:768px){
  .header-inner{flex-wrap:wrap;gap:10px}
  .main-nav ul{flex-wrap:wrap;justify-content:center;gap:3px}
  .main-nav a{padding:6px 10px;font-size:13px}
  .hero-content h2{font-size:24px}
  .hero-content p{font-size:15px}
  .video-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}
  .section{padding:30px 0}
  .section-title h2{font-size:22px}
  .footer-grid{grid-template-columns:1fr}
  .logo-area h1{font-size:16px}
  .contact-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:repeat(auto-fill,minmax(220px,1fr))}
}
@media(max-width:480px){
  .video-grid{grid-template-columns:1fr}
  .hero-banner{max-height:300px}
  .hero-content{padding:0 20px}
  .hero-content h2{font-size:20px}
  .btn-primary{padding:10px 22px;font-size:14px}
  .btn-outline{display:none}
}

/* ===== 懒加载 ===== */
img[loading="lazy"]{opacity:0;transition:opacity .5s}
img[loading="lazy"].loaded,img[loading="lazy"][src]{opacity:1}

/* ===== MCP前端占位 ===== */
.mcp-widget{background:#16213e;border-radius:8px;padding:15px;margin-top:15px;text-align:center;color:#aaa;font-size:13px}