/* ===== 九一吃瓜每日投稿 - 全站样式 ===== */
/* Reset */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:#333;background:#fff;line-height:1.7}
a{color:#2ECC71;text-decoration:none;transition:color .3s}
a:hover{color:#FF6B6B}
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:28px;margin-bottom:10px;position:relative;display:inline-block}
.section-title h2::after{content:'';display:block;width:60px;height:3px;background:linear-gradient(90deg,#2ECC71,#FF6B6B);margin:10px auto 0}
.section-title p{color:#666;font-size:15px;max-width:600px;margin:0 auto}

/* Header */
.site-header{background:#fff;box-shadow:0 2px 10px rgba(0,0,0,.08);position:sticky;top:0;z-index:1000}
.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:45px;width:auto}
.logo span{font-size:18px;font-weight:700;color:#1a1a2e}
.main-nav{display:flex;align-items:center;gap:0}
.main-nav a{padding:10px 14px;font-size:14px;color:#333;font-weight:500;transition:all .3s;border-radius:6px}
.main-nav a:hover,.main-nav a.active{color:#2ECC71;background:rgba(46,204,113,.08)}
.mobile-menu-btn{display:none;background:none;border:none;font-size:24px;cursor:pointer;padding:8px}

/* Search Bar */
.search-bar{background:#f8f9fa;padding:15px 0;border-bottom:1px solid #eee}
.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:12px 20px;border:2px solid #e0e0e0;border-radius:25px 0 0 25px;font-size:14px;outline:none;transition:border-color .3s}
.search-form input:focus{border-color:#2ECC71}
.search-form button{padding:12px 25px;background:linear-gradient(135deg,#2ECC71,#27ae60);color:#fff;border:none;border-radius:0 25px 25px 0;cursor:pointer;font-size:14px;font-weight:600;transition:opacity .3s}
.search-form button:hover{opacity:.9}

/* Hero */
.hero{position:relative;height:500px;overflow:hidden;display:flex;align-items:center;justify-content:center;text-align:center;color:#fff}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.5)}
.hero-content{position:relative;z-index:2;padding:0 20px}
.hero-content h1{font-size:42px;margin-bottom:15px;text-shadow:0 2px 10px rgba(0,0,0,.5)}
.hero-content p{font-size:18px;opacity:.9;max-width:600px;margin:0 auto 25px}
.hero-btn{display:inline-block;padding:14px 35px;background:linear-gradient(135deg,#FF6B6B,#ee5a24);color:#fff;border-radius:30px;font-size:16px;font-weight:600;transition:transform .3s,box-shadow .3s}
.hero-btn:hover{transform:translateY(-2px);box-shadow:0 8px 25px rgba(255,107,107,.4);color:#fff}

/* Video Card Grid */
.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:25px}
.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;cursor:pointer}
.video-thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .5s}
.video-card:hover .video-thumb img{transform:scale(1.05)}
.video-play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:60px;height:60px;background:rgba(255,255,255,.9);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s;z-index:2}
.video-play-btn::after{content:'';width:0;height:0;border-style:solid;border-width:12px 0 12px 20px;border-color:transparent transparent transparent #FF6B6B;margin-left:4px}
.video-card:hover .video-play-btn{opacity:1}
.video-meta{padding:15px}
.video-meta h3{font-size:16px;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-stats{display:flex;gap:15px;color:#999;font-size:13px}
.video-stats span{display:flex;align-items:center;gap:4px}
.video-tag{display:inline-block;padding:2px 8px;background:#f0f9f4;color:#2ECC71;border-radius:4px;font-size:12px;margin-right:5px}
.video-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.75);color:#fff;padding:2px 8px;border-radius:4px;font-size:12px;z-index:2}

/* Feature Modules */
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.feature-item{text-align:center;padding:30px 20px;background:#f8f9fa;border-radius:12px;transition:all .3s}
.feature-item:hover{background:#fff;box-shadow:0 8px 25px rgba(0,0,0,.1);transform:translateY(-3px)}
.feature-icon{width:60px;height:60px;margin:0 auto 15px;background:linear-gradient(135deg,#2ECC71,#27ae60);border-radius:15px;display:flex;align-items:center;justify-content:center;font-size:28px;color:#fff}
.feature-item h4{font-size:16px;margin-bottom:8px}
.feature-item p{font-size:13px;color:#666}

/* Expert Section */
.expert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:25px}
.expert-card{text-align:center;padding:30px 20px;background:#fff;border-radius:12px;box-shadow:0 4px 15px rgba(0,0,0,.06);transition:all .3s}
.expert-card:hover{box-shadow:0 8px 30px rgba(0,0,0,.12);transform:translateY(-3px)}
.expert-avatar{width:100px;height:100px;border-radius:50%;margin:0 auto 15px;overflow:hidden;border:3px solid #2ECC71}
.expert-avatar img{width:100%;height:100%;object-fit:cover}
.expert-card h4{font-size:16px;margin-bottom:5px}
.expert-card .role{color:#2ECC71;font-size:13px;margin-bottom:10px}
.expert-card p{font-size:13px;color:#666;margin-bottom:15px}
.expert-btns{display:flex;gap:8px;justify-content:center}
.btn-sm{padding:6px 16px;border-radius:20px;font-size:12px;border:1px solid #2ECC71;color:#2ECC71;transition:all .3s;background:transparent;cursor:pointer}
.btn-sm:hover{background:#2ECC71;color:#fff}
.btn-sm.primary{background:#2ECC71;color:#fff}
.btn-sm.primary:hover{background:#27ae60}

/* Partners */
.partner-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:20px;align-items:center}
.partner-item{padding:20px;background:#f8f9fa;border-radius:10px;display:flex;align-items:center;justify-content:center;min-height:80px;transition:all .3s}
.partner-item:hover{box-shadow:0 4px 15px rgba(0,0,0,.08)}
.partner-item span{font-size:14px;font-weight:600;color:#666}

/* FAQ */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{border:1px solid #eee;border-radius:10px;margin-bottom:12px;overflow:hidden}
.faq-question{padding:18px 20px;background:#f8f9fa;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;font-size:15px;transition:background .3s}
.faq-question:hover{background:#f0f9f4}
.faq-question .arrow{transition:transform .3s;font-size:12px;color:#999}
.faq-item.active .faq-question .arrow{transform:rotate(180deg)}
.faq-answer{padding:0 20px;max-height:0;overflow:hidden;transition:all .3s;font-size:14px;color:#666}
.faq-item.active .faq-answer{padding:15px 20px;max-height:500px}

/* Reviews */
.review-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.review-card{padding:25px;background:#f8f9fa;border-radius:12px;border-left:4px solid #2ECC71}
.review-header{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.review-avatar{width:45px;height:45px;border-radius:50%;background:linear-gradient(135deg,#2ECC71,#FF6B6B);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:18px}
.review-info h4{font-size:15px;margin-bottom:2px}
.review-info .stars{color:#f39c12;font-size:13px}
.review-card p{font-size:14px;color:#555;line-height:1.8}

/* How-to Guide */
.howto-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:step}
.howto-step{text-align:center;padding:25px 15px;position:relative}
.howto-step::before{counter-increment:step;content:counter(step);display:flex;align-items:center;justify-content:center;width:50px;height:50px;background:linear-gradient(135deg,#2ECC71,#27ae60);color:#fff;border-radius:50%;font-size:22px;font-weight:700;margin:0 auto 15px}
.howto-step h4{font-size:15px;margin-bottom:8px}
.howto-step p{font-size:13px;color:#666}

/* Contact Section */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px}
.contact-info-item{display:flex;gap:15px;margin-bottom:20px;align-items:flex-start}
.contact-icon{width:45px;height:45px;background:linear-gradient(135deg,#2ECC71,#27ae60);border-radius:10px;display:flex;align-items:center;justify-content:center;color:#fff;font-size:20px;flex-shrink:0}
.contact-text h4{font-size:15px;margin-bottom:3px}
.contact-text p{font-size:14px;color:#666}
.qrcode-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:20px}
.qrcode-item{text-align:center}
.qrcode-item img{width:150px;height:150px;margin:0 auto 8px;border-radius:8px}
.qrcode-item p{font-size:13px;color:#666}

/* Share Buttons */
.share-bar{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;font-size:13px;color:#fff;transition:opacity .3s;cursor:pointer}
.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:#ccc;padding:50px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px;padding-bottom:30px;border-bottom:1px solid rgba(255,255,255,.1)}
.footer-brand .logo{margin-bottom:15px}
.footer-brand .logo span{color:#fff}
.footer-brand p{font-size:13px;line-height:1.8;color:#999}
.footer-col h4{font-size:16px;color:#fff;margin-bottom:15px}
.footer-col a{display:block;padding:4px 0;font-size:13px;color:#999;transition:color .3s}
.footer-col a:hover{color:#2ECC71}
.footer-bottom{padding:20px 0;text-align:center;font-size:13px;color:#666}
.footer-bottom a{color:#999}
.footer-update{margin-top:5px;font-size:12px;color:#555}

/* Breadcrumb */
.breadcrumb{padding:15px 0;font-size:13px;color:#999}
.breadcrumb a{color:#666}
.breadcrumb a:hover{color:#2ECC71}
.breadcrumb span{margin:0 8px;color:#ccc}

/* Page Header */
.page-header{background:linear-gradient(135deg,#1a1a2e,#16213e);color:#fff;padding:60px 0;text-align:center}
.page-header h1{font-size:32px;color:#fff;margin-bottom:10px}
.page-header p{color:rgba(255,255,255,.7);font-size:15px}

/* Responsive */
@media(max-width:1024px){
  .video-grid{grid-template-columns:repeat(2,1fr)}
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .expert-grid{grid-template-columns:repeat(2,1fr)}
  .partner-grid{grid-template-columns:repeat(3,1fr)}
  .howto-steps{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .header-inner{flex-wrap:wrap}
  .main-nav{display:none;width:100%;flex-direction:column;padding:10px 0}
  .main-nav.active{display:flex}
  .mobile-menu-btn{display:block}
  .hero{height:380px}
  .hero-content h1{font-size:28px}
  .video-grid{grid-template-columns:1fr}
  .feature-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:1fr}
  .review-grid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .howto-steps{grid-template-columns:1fr}
  .partner-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr}
  .section{padding:40px 0}
  .section-title h2{font-size:22px}
}

/* Utility */
.text-center{text-align:center}
.mt-20{margin-top:20px}
.mb-20{margin-bottom:20px}
.bg-light{background:#f8f9fa}
.bg-white{background:#fff}
.tag-list{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.tag{display:inline-block;padding:4px 12px;background:#f0f9f4;color:#2ECC71;border-radius:15px;font-size:12px}

/* Inner page content */
.content-section{padding:40px 0}
.content-section article{max-width:900px;margin:0 auto}
.content-section article h2{font-size:24px;margin:30px 0 15px;padding-bottom:10px;border-bottom:2px solid #f0f0f0}
.content-section article h3{font-size:20px;margin:25px 0 12px}
.content-section article p{margin-bottom:15px;font-size:15px;color:#444;line-height:1.9}
.content-section article img{border-radius:10px;margin:20px 0}

/* Lazy load placeholder */
.lazy{opacity:0;transition:opacity .5s}
.lazy.loaded{opacity:1}