/* ========================================
   51吃瓜每日投稿 - 全站样式表
   fenghuangjingying.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","Hiragino Sans GB","Microsoft YaHei","WenQuanYi Micro Hei",sans-serif;color:#333;background:#f8f9fa;line-height:1.7}
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:#222}

/* --- Container --- */
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* --- Header --- */
.site-header{background:linear-gradient(135deg,#1a1a2e 0%,#16213e 50%,#0f3460 100%);color:#fff;position:sticky;top:0;z-index:1000;box-shadow:0 2px 15px rgba(0,0,0,.3)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:10px 0;flex-wrap:wrap}
.site-logo{display:flex;align-items:center;gap:10px}
.site-logo img{height:48px;width:auto}
.site-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:#ddd;padding:10px 16px;font-size:.95rem;transition:all .3s;border-radius:4px}
.main-nav a:hover,.main-nav a.active{color:#fff;background:rgba(255,255,255,.12)}

/* --- Search Bar --- */
.search-bar{background:rgba(255,255,255,.06);padding:10px 0;border-bottom:1px solid rgba(255,255,255,.08)}
.search-bar .container{display:flex;justify-content:center}
.search-form{display:flex;max-width:600px;width:100%;position:relative}
.search-form input{flex:1;padding:10px 18px;border:2px solid rgba(255,255,255,.2);border-radius:25px 0 0 25px;background:rgba(255,255,255,.1);color:#fff;font-size:.95rem;outline:none;transition:border-color .3s}
.search-form input::placeholder{color:rgba(255,255,255,.5)}
.search-form input:focus{border-color:#e74c3c}
.search-form button{padding:10px 24px;background:linear-gradient(135deg,#e74c3c,#c0392b);color:#fff;border:none;border-radius:0 25px 25px 0;cursor:pointer;font-size:.95rem;transition:opacity .3s}
.search-form button:hover{opacity:.9}

/* --- Breadcrumb --- */
.breadcrumb{padding:12px 0;font-size:.85rem;color:#888}
.breadcrumb a{color:#e74c3c}
.breadcrumb span{margin:0 6px;color:#ccc}

/* --- Hero Banner --- */
.hero-banner{position:relative;overflow:hidden;max-height:480px}
.hero-banner img{width:100%;object-fit:cover;min-height:300px}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(to right,rgba(0,0,0,.7) 0%,rgba(0,0,0,.2) 100%);display:flex;align-items:center}
.hero-content{padding:40px;max-width:600px}
.hero-content h1{font-size:2.2rem;color:#fff;margin-bottom:15px;text-shadow:2px 2px 8px rgba(0,0,0,.5)}
.hero-content p{color:rgba(255,255,255,.9);font-size:1.05rem;margin-bottom:20px}
.hero-content .btn{display:inline-block;padding:12px 30px;background:linear-gradient(135deg,#e74c3c,#c0392b);color:#fff;border-radius:25px;font-weight:600;transition:transform .3s,box-shadow .3s}
.hero-content .btn:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(231,76,60,.4)}

/* --- Section Common --- */
.section{padding:50px 0}
.section-title{text-align:center;margin-bottom:35px}
.section-title h2{font-size:1.8rem;color:#222;margin-bottom:8px}
.section-title p{color:#777;font-size:1rem}
.section-alt{background:#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 4px 15px rgba(0,0,0,.08);transition:transform .3s,box-shadow .3s}
.video-card:hover{transform:translateY(-5px);box-shadow:0 8px 30px rgba(0,0,0,.15)}
.video-thumb{position:relative;padding-top:56.25%;overflow:hidden;background:#000}
.video-thumb video{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover}
.video-thumb .play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:60px;height:60px;background:rgba(231,76,60,.85);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s;cursor:pointer;z-index:2}
.video-thumb .play-btn::after{content:"";display:block;width:0;height:0;border-style:solid;border-width:10px 0 10px 18px;border-color:transparent transparent transparent #fff;margin-left:4px}
.video-card:hover .play-btn{opacity:1}
.video-thumb .duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.75);color:#fff;padding:2px 8px;border-radius:4px;font-size:.75rem;z-index:2}
.video-info{padding:14px 16px}
.video-info h3{font-size:1rem;margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;gap:12px;font-size:.8rem;color:#999}
.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:#fef0ef;color:#e74c3c;padding:2px 10px;border-radius:12px;font-size:.75rem}

/* --- Expert Cards --- */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}
.expert-card{background:#fff;border-radius:12px;padding:28px 20px;text-align:center;box-shadow:0 4px 15px rgba(0,0,0,.08);transition:transform .3s}
.expert-card:hover{transform:translateY(-5px)}
.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:1.05rem;margin-bottom:4px}
.expert-card .title{color:#e74c3c;font-size:.85rem;margin-bottom:10px}
.expert-card p{font-size:.85rem;color:#666;margin-bottom:15px}
.expert-card .btn-sm{display:inline-block;padding:6px 18px;background:#e74c3c;color:#fff;border-radius:20px;font-size:.8rem;margin:0 4px;transition:background .3s}
.expert-card .btn-sm:hover{background:#c0392b}
.expert-card .btn-outline{background:transparent;border:1px solid #e74c3c;color:#e74c3c}
.expert-card .btn-outline:hover{background:#e74c3c;color:#fff}

/* --- FAQ Section --- */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#fff;border-radius:10px;margin-bottom:12px;box-shadow:0 2px 8px rgba(0,0,0,.06);overflow:hidden}
.faq-question{padding:18px 24px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;transition:background .3s}
.faq-question:hover{background:#fef0ef}
.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 24px;max-height:0;overflow:hidden;transition:all .3s ease;color:#666;font-size:.92rem}
.faq-item.active .faq-answer{padding:0 24px 18px;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 4px 15px rgba(0,0,0,.08)}
.review-card .stars{color:#f39c12;font-size:1rem;margin-bottom:10px}
.review-card p{font-size:.9rem;color:#555;margin-bottom:12px;font-style:italic}
.review-card .reviewer{display:flex;align-items:center;gap:10px;font-size:.85rem;color:#888}
.review-card .reviewer strong{color:#333}

/* --- Partner Logos --- */
.partner-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:30px;align-items:center;padding:20px 0}
.partner-wall .partner-item{background:#fff;padding:15px 25px;border-radius:10px;box-shadow:0 2px 8px rgba(0,0,0,.06);font-weight:700;color:#555;font-size:1rem;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(220px,1fr));gap:20px;margin-top:20px}
.howto-step{background:#fff;border-radius:12px;padding:24px;text-align:center;box-shadow:0 4px 15px rgba(0,0,0,.08)}
.howto-step .step-num{width:48px;height:48px;background:linear-gradient(135deg,#e74c3c,#c0392b);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.2rem;font-weight:700;margin:0 auto 12px}
.howto-step h4{margin-bottom:8px;font-size:1rem}
.howto-step p{font-size:.85rem;color:#666}

/* --- Contact Section --- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:30px}
.contact-info{background:#fff;border-radius:12px;padding:30px;box-shadow:0 4px 15px rgba(0,0,0,.08)}
.contact-info h3{margin-bottom:15px;font-size:1.2rem}
.contact-info .info-item{display:flex;align-items:flex-start;gap:12px;margin-bottom:14px;font-size:.9rem;color:#555}
.contact-info .info-item strong{color:#333;min-width:70px}
.contact-qr{display:flex;gap:20px;margin-top:20px}
.contact-qr .qr-item{text-align:center}
.contact-qr .qr-item img{width:150px;height:150px;border-radius:8px;margin-bottom:6px}
.contact-qr .qr-item span{font-size:.8rem;color:#888}

/* --- Share Buttons --- */
.share-bar{display:flex;gap:10px;justify-content:center;padding:20px 0;flex-wrap:wrap}
.share-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 18px;border-radius:20px;color:#fff;font-size:.85rem;transition:opacity .3s;cursor:pointer}
.share-btn:hover{opacity:.85;color:#fff}
.share-wechat{background:#07c160}
.share-weibo{background:#e6162d}
.share-douyin{background:#161823}
.share-bilibili{background:#00a1d6}

/* --- Footer --- */
.site-footer{background:linear-gradient(135deg,#1a1a2e 0%,#16213e 100%);color:#ccc;padding:40px 0 20px}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:30px;margin-bottom:30px}
.footer-col h4{color:#fff;margin-bottom:15px;font-size:1rem}
.footer-col p,.footer-col a{font-size:.85rem;color:#aaa;display:block;margin-bottom:6px}
.footer-col a:hover{color:#e74c3c}
.footer-col img{height:36px;margin-bottom:10px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:20px;text-align:center;font-size:.8rem;color:#888}
.footer-qr{display:flex;gap:15px;margin-top:10px}
.footer-qr img{width:100px;height:100px;border-radius:6px}

/* --- Page Content --- */
.page-hero{background:linear-gradient(135deg,#1a1a2e,#0f3460);color:#fff;padding:60px 0 40px;text-align:center}
.page-hero h1{font-size:2rem;color:#fff;margin-bottom:10px}
.page-hero p{color:rgba(255,255,255,.8);font-size:1rem}
.page-content{padding:40px 0}
.content-block{background:#fff;border-radius:12px;padding:30px;margin-bottom:24px;box-shadow:0 4px 15px rgba(0,0,0,.08)}
.content-block h2{font-size:1.4rem;margin-bottom:15px;padding-bottom:10px;border-bottom:2px solid #e74c3c}
.content-block h3{font-size:1.15rem;margin:15px 0 10px;color:#e74c3c}
.content-block p{margin-bottom:12px;color:#555;font-size:.92rem}

/* --- Mobile Nav Toggle --- */
.nav-toggle{display:none;background:none;border:none;color:#fff;font-size:1.5rem;cursor:pointer;padding:5px}

/* --- Responsive --- */
@media(max-width:768px){
  .nav-toggle{display:block}
  .main-nav{display:none;width:100%;flex-direction:column;background:#16213e;padding:10px 0;border-radius:0 0 10px 10px}
  .main-nav.show{display:flex}
  .main-nav a{padding:12px 20px;border-bottom:1px solid rgba(255,255,255,.05)}
  .hero-content h1{font-size:1.5rem}
  .hero-content p{font-size:.9rem}
  .hero-content{padding:20px}
  .contact-grid{grid-template-columns:1fr}
  .video-grid{grid-template-columns:1fr 1fr}
  .section{padding:30px 0}
  .section-title h2{font-size:1.4rem}
  .header-inner{padding:8px 0}
}
@media(max-width:480px){
  .video-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:1fr}
  .howto-steps{grid-template-columns:1fr}
  .hero-banner{max-height:300px}
}

/* --- Utility --- */
.text-center{text-align:center}
.mt-20{margin-top:20px}
.mb-20{margin-bottom:20px}
.hidden{display:none}

/* --- Lazy Load Placeholder --- */
.lazy{opacity:0;transition:opacity .5s}
.lazy.loaded{opacity:1}

/* --- MCP Frontend Placeholder --- */
.mcp-widget{background:#f0f0f0;border-radius:10px;padding:20px;text-align:center;color:#999;font-size:.85rem;margin-top:20px}