/* ============================================
   呦呦视频趣味影像 - 原创样式表
   配色：深邃藏蓝 #1B2838 + 暖橘金 #E8A87C + 琥珀金 #D4AF37
   ============================================ */

/* 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","Noto Sans SC",sans-serif;color:#2C2C3A;background:#F5F0EB;line-height:1.7;overflow-x:hidden}
a{color:#1B2838;text-decoration:none;transition:color .3s}
a:hover{color:#E8A87C}
img{max-width:100%;height:auto;display:block}
ul{list-style:none}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* Header */
.site-header{position:fixed;top:0;left:0;width:100%;z-index:1000;background:rgba(27,40,56,.95);backdrop-filter:blur(10px);transition:all .3s}
.site-header.scrolled{box-shadow:0 2px 20px rgba(0,0,0,.15)}
.header-inner{max-width:1200px;margin:0 auto;padding:0 20px;display:flex;align-items:center;height:70px}
.logo-link{flex-shrink:0}
.logo-img{height:46px;width:auto}
.main-nav{margin-left:40px;flex:1}
.main-nav ul{display:flex;gap:8px}
.main-nav a{color:#ccc;font-size:15px;padding:8px 16px;border-radius:6px;transition:all .3s;white-space:nowrap}
.main-nav a:hover,.main-nav a.active{color:#fff;background:rgba(232,168,124,.2)}
.header-search{margin-left:20px}
.search-form{display:flex;align-items:center;background:rgba(255,255,255,.1);border-radius:20px;overflow:hidden}
.search-form input{background:none;border:none;color:#fff;padding:6px 14px;font-size:13px;width:160px;outline:none}
.search-form input::placeholder{color:rgba(255,255,255,.5)}
.search-btn{background:#E8A87C;color:#1B2838;border:none;padding:6px 16px;font-size:13px;cursor:pointer;font-weight:600;transition:background .3s}
.search-btn:hover{background:#D4AF37}
.mobile-menu-btn{display:none;background:none;border:none;cursor:pointer;padding:8px;flex-direction:column;gap:5px}
.mobile-menu-btn span{display:block;width:24px;height:2px;background:#fff;transition:all .3s}

/* Hero */
.hero-section{position:relative;height:85vh;min-height:500px;display:flex;align-items:center;justify-content:center;overflow:hidden;margin-top:70px}
.hero-bg{position:absolute;inset:0}
.hero-bg img{width:100%;height:100%;object-fit:cover}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(27,40,56,.82) 0%,rgba(45,64,89,.65) 100%)}
.hero-content{position:relative;z-index:2;text-align:center;color:#fff;max-width:800px;padding:0 20px}
.hero-title{font-size:42px;font-weight:800;margin-bottom:20px;line-height:1.3;text-shadow:0 2px 10px rgba(0,0,0,.3)}
.hero-subtitle{font-size:17px;line-height:1.8;opacity:.9;margin-bottom:32px}
.hero-cta{display:flex;gap:16px;justify-content:center;margin-bottom:40px}
.btn{display:inline-block;padding:12px 32px;border-radius:8px;font-size:15px;font-weight:600;transition:all .3s;cursor:pointer;border:2px solid transparent}
.btn-primary{background:#E8A87C;color:#1B2838;border-color:#E8A87C}
.btn-primary:hover{background:#D4AF37;border-color:#D4AF37;color:#1B2838}
.btn-outline{background:transparent;color:#fff;border-color:rgba(255,255,255,.5)}
.btn-outline:hover{background:rgba(255,255,255,.15);border-color:#fff;color:#fff}
.btn-sm{padding:8px 20px;font-size:13px;border-radius:6px}
.hero-stats{display:flex;gap:48px;justify-content:center}
.stat-item{text-align:center}
.stat-num{display:block;font-size:28px;font-weight:800;color:#E8A87C}
.stat-label{font-size:13px;opacity:.8}

/* Danmaku */
.danmaku-layer{position:absolute;inset:0;pointer-events:none;overflow:hidden;z-index:3}
.danmaku-item{position:absolute;white-space:nowrap;color:rgba(255,255,255,.6);font-size:14px;animation:danmakuScroll linear forwards;will-change:transform}
@keyframes danmakuScroll{from{transform:translateX(100vw)}to{transform:translateX(-100%)}}

/* Sections */
.section{padding:80px 0}
.section:nth-child(even){background:#fff}
.section-header{text-align:center;margin-bottom:50px}
.section-title{font-size:32px;font-weight:800;color:#1B2838;margin-bottom:14px;position:relative;display:inline-block}
.section-title::after{content:'';position:absolute;bottom:-8px;left:50%;transform:translateX(-50%);width:60px;height:3px;background:linear-gradient(90deg,#E8A87C,#D4AF37);border-radius:2px}
.section-desc{color:#666;font-size:15px;max-width:680px;margin:16px auto 0}

/* Video Grid */
.video-filter{display:flex;gap:10px;justify-content:center;margin-bottom:36px;flex-wrap:wrap}
.filter-btn{background:none;border:2px solid #ddd;padding:8px 22px;border-radius:20px;font-size:14px;cursor:pointer;transition:all .3s;color:#666}
.filter-btn.active,.filter-btn:hover{border-color:#E8A87C;color:#1B2838;background:rgba(232,168,124,.12)}
.video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.video-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 20px rgba(0,0,0,.06);transition:all .3s}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 36px rgba(0,0,0,.12)}
.video-thumb{position:relative;overflow:hidden;aspect-ratio:3/4}
.video-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.video-card:hover .video-thumb img{transform:scale(1.06)}
.video-play-overlay{position:absolute;inset:0;background:rgba(27,40,56,.4);display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s}
.video-card:hover .video-play-overlay{opacity:1}
.play-btn{width:56px;height:56px;background:rgba(232,168,124,.9);border-radius:50%;position:relative}
.play-btn::after{content:'';position:absolute;left:22px;top:16px;border-style:solid;border-width:12px 0 12px 20px;border-color:transparent transparent transparent #fff}
.video-duration{position:absolute;bottom:10px;right:10px;background:rgba(0,0,0,.7);color:#fff;padding:2px 8px;border-radius:4px;font-size:12px}
.video-tag{position:absolute;top:10px;left:10px;background:#E8A87C;color:#1B2838;padding:3px 10px;border-radius:4px;font-size:12px;font-weight:600}
.video-info{padding:16px}
.video-title{font-size:14px;font-weight:600;line-height:1.5;margin-bottom:10px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;gap:12px;font-size:12px;color:#999;flex-wrap:wrap}

/* AI Section */
.ai-section{background:linear-gradient(135deg,#1B2838 0%,#2D4059 100%);color:#fff}
.ai-section .section-title{color:#fff}
.ai-section .section-title::after{background:linear-gradient(90deg,#E8A87C,#D4AF37)}
.ai-section .section-desc{color:rgba(255,255,255,.7)}
.ai-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px}
.ai-card{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.1);border-radius:16px;padding:36px 28px;text-align:center;transition:all .3s}
.ai-card:hover{background:rgba(255,255,255,.14);transform:translateY(-4px)}
.ai-icon{margin-bottom:20px}
.ai-card h3{font-size:20px;margin-bottom:14px;color:#E8A87C}
.ai-card p{font-size:14px;line-height:1.8;color:rgba(255,255,255,.75)}

/* Experts */
.experts-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px}
.expert-card{background:#fff;border-radius:16px;padding:36px 24px;text-align:center;box-shadow:0 4px 20px rgba(0,0,0,.06);transition:all .3s}
.expert-card:hover{transform:translateY(-4px);box-shadow:0 12px 36px rgba(0,0,0,.1)}
.expert-avatar{width:120px;height:120px;border-radius:50%;overflow:hidden;margin:0 auto 20px;border:3px solid #E8A87C}
.expert-avatar img{width:100%;height:100%;object-fit:cover}
.expert-name{font-size:20px;font-weight:700;margin-bottom:6px}
.expert-title{font-size:14px;color:#E8A87C;margin-bottom:14px}
.expert-bio{font-size:13px;color:#666;line-height:1.7;margin-bottom:16px}
.expert-tags{display:flex;gap:8px;justify-content:center;margin-bottom:18px;flex-wrap:wrap}
.expert-tags span{background:rgba(232,168,124,.12);color:#1B2838;padding:4px 12px;border-radius:12px;font-size:12px}
.expert-actions{display:flex;gap:10px;justify-content:center}

/* News Timeline */
.news-timeline{max-width:800px;margin:0 auto;position:relative;padding-left:30px}
.news-timeline::before{content:'';position:absolute;left:8px;top:0;bottom:0;width:2px;background:linear-gradient(180deg,#E8A87C,#D4AF37)}
.news-item{position:relative;margin-bottom:36px;display:flex;gap:24px;align-items:flex-start}
.news-item::before{content:'';position:absolute;left:-26px;top:8px;width:12px;height:12px;background:#E8A87C;border-radius:50%;border:2px solid #F5F0EB}
.news-date{flex-shrink:0;text-align:center;background:#1B2838;color:#fff;border-radius:8px;padding:10px 14px;min-width:70px}
.news-date .day{display:block;font-size:24px;font-weight:800;line-height:1}
.news-date .month{display:block;font-size:11px;opacity:.7;margin-top:4px}
.news-content h3{font-size:17px;font-weight:700;margin-bottom:8px;color:#1B2838}
.news-content p{font-size:14px;color:#666;line-height:1.7}

/* FAQ */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{border:1px solid #e8e0d8;border-radius:10px;margin-bottom:12px;overflow:hidden;transition:all .3s}
.faq-item.active{border-color:#E8A87C}
.faq-question{display:flex;justify-content:space-between;align-items:center;padding:18px 24px;cursor:pointer;transition:background .3s}
.faq-question:hover{background:rgba(232,168,124,.06)}
.faq-question h3{font-size:15px;font-weight:600;flex:1}
.faq-toggle{font-size:22px;color:#E8A87C;font-weight:300;transition:transform .3s;flex-shrink:0;margin-left:16px}
.faq-item.active .faq-toggle{transform:rotate(45deg)}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .4s ease,padding .4s ease}
.faq-item.active .faq-answer{max-height:300px;padding:0 24px 18px}
.faq-answer p{font-size:14px;color:#666;line-height:1.8}

/* Reviews */
.reviews-slider{display:flex;gap:24px;overflow-x:auto;scroll-snap-type:x mandatory;-webkit-overflow-scrolling:touch;padding:10px 0;scrollbar-width:none}
.reviews-slider::-webkit-scrollbar{display:none}
.review-card{flex:0 0 350px;scroll-snap-align:start;background:#fff;border-radius:14px;padding:28px;box-shadow:0 4px 20px rgba(0,0,0,.06);border-left:4px solid #E8A87C}
.review-stars{color:#D4AF37;font-size:18px;margin-bottom:14px;letter-spacing:2px}
.review-text{font-size:14px;color:#444;line-height:1.8;margin-bottom:18px;font-style:italic}
.review-author{display:flex;gap:12px;align-items:center}
.author-name{font-weight:700;font-size:14px}
.author-role{font-size:12px;color:#999}
.slider-controls{display:flex;justify-content:center;gap:16px;margin-top:24px}
.slider-btn{width:40px;height:40px;border-radius:50%;border:2px solid #1B2838;background:none;font-size:16px;cursor:pointer;transition:all .3s;display:flex;align-items:center;justify-content:center;color:#1B2838}
.slider-btn:hover{background:#1B2838;color:#fff}

/* HowTo */
.howto-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.step-item{text-align:center;padding:30px 20px;background:#fff;border-radius:14px;box-shadow:0 4px 16px rgba(0,0,0,.05);position:relative;transition:all .3s}
.step-item:hover{transform:translateY(-4px);box-shadow:0 8px 30px rgba(0,0,0,.1)}
.step-number{font-size:42px;font-weight:900;color:rgba(232,168,124,.25);margin-bottom:12px;line-height:1}
.step-item h3{font-size:17px;font-weight:700;margin-bottom:10px;color:#1B2838}
.step-item p{font-size:13px;color:#666;line-height:1.7}

/* About */
.about-layout{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:center}
.about-text .section-title{text-align:left;display:block;margin-bottom:24px}
.about-text .section-title::after{left:0;transform:none}
.about-text p{font-size:15px;color:#555;line-height:1.9;margin-bottom:16px}
.about-highlights{display:flex;gap:36px;margin-top:28px}
.highlight-item{text-align:center}
.highlight-num{display:block;font-size:28px;font-weight:800;color:#E8A87C}
.highlight-item span:last-child{font-size:13px;color:#888}
.about-image{border-radius:16px;overflow:hidden;box-shadow:0 8px 30px rgba(0,0,0,.1)}
.about-image img{width:100%;height:auto}

/* Contact */
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.contact-card{background:#fff;border-radius:14px;padding:30px;box-shadow:0 4px 16px rgba(0,0,0,.05)}
.contact-card h3{font-size:18px;font-weight:700;margin-bottom:18px;color:#1B2838;padding-bottom:12px;border-bottom:2px solid #E8A87C}
.contact-list li{font-size:14px;color:#555;padding:8px 0;line-height:1.6}
.contact-list li strong{color:#1B2838}
.qrcode-row{display:flex;gap:20px;margin-top:18px}
.qrcode-item{text-align:center}
.qrcode-item img{border-radius:8px;border:1px solid #eee}
.qrcode-item span{display:block;font-size:12px;color:#888;margin-top:6px}
.social-share{display:flex;flex-wrap:wrap;gap:12px;margin-top:10px}
.share-btn{display:inline-block;padding:10px 20px;border-radius:8px;font-size:14px;font-weight:600;color:#fff;transition:all .3s}
.share-wechat{background:#07C160}
.share-weibo{background:#E6162D}
.share-douyin{background:#161823}
.share-bilibili{background:#00A1D6}
.share-btn:hover{opacity:.85;transform:translateY(-2px);color:#fff}

/* Footer */
.site-footer{background:#1B2838;color:rgba(255,255,255,.7);padding:60px 0 0}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px;padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,.1)}
.footer-logo{height:40px;width:auto;margin-bottom:16px}
.footer-desc{font-size:13px;line-height:1.7}
.footer-col h4{color:#E8A87C;font-size:16px;margin-bottom:18px}
.footer-col ul li{margin-bottom:10px}
.footer-col ul li a,.footer-col ul li{color:rgba(255,255,255,.6);font-size:13px;transition:color .3s}
.footer-col ul li a:hover{color:#E8A87C}
.footer-bottom{text-align:center;padding:24px 0;font-size:13px;color:rgba(255,255,255,.4)}

/* Mobile Responsive */
@media(max-width:1024px){
  .video-grid{grid-template-columns:repeat(3,1fr)}
  .experts-grid{grid-template-columns:repeat(2,1fr)}
  .howto-steps{grid-template-columns:repeat(2,1fr)}
  .contact-grid{grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .header-inner{height:60px}
  .main-nav{display:none;position:absolute;top:60px;left:0;width:100%;background:#1B2838;padding:20px}
  .main-nav.active{display:block}
  .main-nav ul{flex-direction:column;gap:4px}
  .main-nav a{display:block;padding:12px 20px}
  .header-search{display:none}
  .mobile-menu-btn{display:flex}
  .hero-section{height:70vh;min-height:400px}
  .hero-title{font-size:28px}
  .hero-subtitle{font-size:14px}
  .hero-stats{gap:24px}
  .stat-num{font-size:22px}
  .section{padding:50px 0}
  .section-title{font-size:24px}
  .video-grid{grid-template-columns:repeat(2,1fr);gap:16px}
  .ai-grid{grid-template-columns:1fr}
  .experts-grid{grid-template-columns:1fr}
  .about-layout{grid-template-columns:1fr;gap:30px}
  .howto-steps{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:24px}
  .review-card{flex:0 0 280px}
}
@media(max-width:480px){
  .video-grid{grid-template-columns:1fr}
  .hero-cta{flex-direction:column;align-items:center}
  .hero-stats{flex-direction:column;gap:16px}
}

/* Search Tip Modal */
.modal-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:9999;align-items:center;justify-content:center}
.modal-overlay.active{display:flex}
.modal-box{background:#fff;border-radius:16px;padding:36px;max-width:400px;width:90%;text-align:center;box-shadow:0 20px 60px rgba(0,0,0,.2)}
.modal-box h3{font-size:20px;margin-bottom:12px;color:#1B2838}
.modal-box p{font-size:14px;color:#666;margin-bottom:24px;line-height:1.7}
.modal-close{background:#E8A87C;color:#1B2838;border:none;padding:10px 30px;border-radius:8px;font-size:14px;font-weight:600;cursor:pointer;transition:background .3s}
.modal-close:hover{background:#D4AF37}