/* ============================================
   51视频 - 原创样式表
   品牌色系：深夜蓝黑 + 樱花红
   ============================================ */

/* === 基础重置 === */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","WenQuanYi Micro Hei",sans-serif;color:#EAEAEA;background:#0D0D1A;line-height:1.7;overflow-x:hidden}
a{color:#E94560;text-decoration:none;transition:color .3s}
a:hover{color:#FF6B81}
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:#fff}

/* === 容器 === */
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.section-wrap{padding:60px 0}
.section-wrap:nth-child(even){background:rgba(15,52,96,0.15)}

/* === 头部导航 === */
.site-header{background:rgba(13,13,26,0.96);position:sticky;top:0;z-index:1000;border-bottom:1px solid rgba(233,69,96,0.2);backdrop-filter:blur(12px)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;max-width:1200px;margin:0 auto}
.logo-link{display:flex;align-items:center;gap:10px}
.logo-link img{height:42px;width:auto}
.logo-text{font-size:1.4rem;font-weight:800;background:linear-gradient(135deg,#E94560,#0F3460);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.main-nav{display:flex;align-items:center;gap:0}
.main-nav a{padding:10px 16px;font-size:.95rem;color:#ccc;transition:all .3s;border-radius:6px}
.main-nav a:hover,.main-nav a.active{color:#fff;background:rgba(233,69,96,0.15)}
.mobile-toggle{display:none;background:none;border:none;color:#fff;font-size:1.5rem;cursor:pointer}

/* === 搜索框 === */
.search-bar{background:rgba(22,33,62,0.6);padding:14px 0;border-bottom:1px solid rgba(233,69,96,0.1)}
.search-bar .container{display:flex;justify-content:center}
.search-input-wrap{display:flex;max-width:560px;width:100%;border-radius:25px;overflow:hidden;border:2px solid rgba(233,69,96,0.3);transition:border-color .3s}
.search-input-wrap:focus-within{border-color:#E94560}
.search-input-wrap input{flex:1;padding:10px 20px;background:rgba(13,13,26,0.8);border:none;color:#eee;font-size:.95rem;outline:none}
.search-input-wrap input::placeholder{color:#666}
.search-input-wrap button{padding:10px 24px;background:linear-gradient(135deg,#E94560,#c0392b);border:none;color:#fff;font-size:.95rem;cursor:pointer;transition:opacity .3s}
.search-input-wrap button:hover{opacity:.85}

/* === Hero横幅 === */
.hero-section{position:relative;overflow:hidden;min-height:420px;display:flex;align-items:center}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(0.5)}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(13,13,26,0.3) 0%,rgba(13,13,26,0.85) 100%)}
.hero-content{position:relative;z-index:2;text-align:center;padding:60px 20px}
.hero-content h1{font-size:2.6rem;margin-bottom:16px;text-shadow:0 2px 20px rgba(233,69,96,0.4)}
.hero-content h1 span{color:#E94560}
.hero-content p{font-size:1.15rem;color:#bbb;max-width:700px;margin:0 auto 24px}
.hero-tags{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin-top:16px}
.hero-tags span{padding:6px 16px;background:rgba(233,69,96,0.15);border:1px solid rgba(233,69,96,0.3);border-radius:20px;font-size:.85rem;color:#E94560}

/* === 区块标题 === */
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:1.9rem;margin-bottom:8px;position:relative;display:inline-block}
.section-title h2::after{content:'';display:block;width:60px;height:3px;background:linear-gradient(90deg,#E94560,#0F3460);margin:10px auto 0;border-radius:2px}
.section-title p{color:#888;font-size:.95rem;margin-top:8px}

/* === 动漫视频卡片 === */
.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.video-card{background:rgba(22,33,62,0.85);border-radius:12px;overflow:hidden;transition:transform .3s,box-shadow .3s;border:1px solid rgba(233,69,96,0.1)}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 40px rgba(233,69,96,0.15)}
.video-thumb{position:relative;padding-top:133%;overflow:hidden}
.video-thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .4s}
.video-card:hover .video-thumb img{transform:scale(1.05)}
.play-btn{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,0.4);opacity:0;transition:opacity .3s}
.video-card:hover .play-btn{opacity:1}
.play-btn span{width:56px;height:56px;background:rgba(233,69,96,0.9);border-radius:50%;display:flex;align-items:center;justify-content:center}
.play-btn span::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-info{padding:16px}
.video-info h3{font-size:1rem;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;gap:12px;font-size:.8rem;color:#777}
.video-meta span{display:flex;align-items:center;gap:4px}
.video-tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}
.video-tags span{padding:2px 10px;background:rgba(233,69,96,0.1);border-radius:10px;font-size:.75rem;color:#E94560}

/* === 分类标签栏 === */
.tab-bar{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin-bottom:30px}
.tab-bar a{padding:8px 20px;border-radius:20px;font-size:.9rem;color:#aaa;border:1px solid rgba(255,255,255,0.1);transition:all .3s}
.tab-bar a:hover,.tab-bar a.active{color:#fff;background:rgba(233,69,96,0.2);border-color:#E94560}

/* === 专家卡片 === */
.expert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.expert-card{background:rgba(22,33,62,0.85);border-radius:12px;padding:24px;text-align:center;border:1px solid rgba(233,69,96,0.1);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 rgba(233,69,96,0.3)}
.expert-avatar img{width:100%;height:100%;object-fit:cover}
.expert-card h4{font-size:1.05rem;margin-bottom:4px}
.expert-card .role{color:#E94560;font-size:.85rem;margin-bottom:10px}
.expert-card p{font-size:.85rem;color:#999;margin-bottom:14px}
.expert-btns{display:flex;gap:8px;justify-content:center}
.btn-sm{padding:6px 16px;border-radius:18px;font-size:.8rem;border:1px solid rgba(233,69,96,0.4);color:#E94560;transition:all .3s;background:transparent;cursor:pointer}
.btn-sm:hover{background:#E94560;color:#fff}

/* === FAQ === */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:rgba(22,33,62,0.6);border-radius:10px;margin-bottom:12px;border:1px solid rgba(233,69,96,0.1);overflow:hidden}
.faq-q{padding:16px 20px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;font-size:.95rem;transition:background .3s}
.faq-q:hover{background:rgba(233,69,96,0.08)}
.faq-q::after{content:'+';font-size:1.3rem;color:#E94560;transition:transform .3s}
.faq-item.open .faq-q::after{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .4s ease,padding .4s ease;padding:0 20px;color:#aaa;font-size:.9rem;line-height:1.8}
.faq-item.open .faq-a{max-height:300px;padding:0 20px 16px}

/* === 用户评论 === */
.review-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.review-card{background:rgba(22,33,62,0.7);border-radius:12px;padding:24px;border:1px solid rgba(233,69,96,0.1)}
.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,#E94560,#0F3460);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{font-size:.8rem;color:#666}
.review-stars{color:#E94560;margin-bottom:8px;font-size:.9rem}
.review-text{font-size:.9rem;color:#bbb;line-height:1.7}

/* === 合作品牌 === */
.brand-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:30px;align-items:center}
.brand-wall .brand-item{padding:16px 28px;background:rgba(22,33,62,0.5);border-radius:10px;border:1px solid rgba(255,255,255,0.08);font-size:1rem;color:#888;transition:all .3s;font-weight:600}
.brand-wall .brand-item:hover{border-color:#E94560;color:#E94560}

/* === 联系信息 === */
.contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:30px}
.contact-box{background:rgba(22,33,62,0.7);border-radius:12px;padding:30px;border:1px solid rgba(233,69,96,0.1)}
.contact-box h4{font-size:1.1rem;margin-bottom:16px;color:#E94560}
.contact-item{display:flex;align-items:flex-start;gap:10px;margin-bottom:12px;font-size:.9rem;color:#bbb}
.contact-item strong{color:#ddd;min-width:70px}

/* === 页脚 === */
.site-footer{background:rgba(10,10,20,0.95);border-top:1px solid rgba(233,69,96,0.15);padding:40px 0 20px}
.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:30px;margin-bottom:30px}
.footer-col h5{font-size:1rem;margin-bottom:16px;color:#E94560}
.footer-col a{display:block;padding:4px 0;font-size:.85rem;color:#888;transition:color .3s}
.footer-col a:hover{color:#E94560}
.footer-col p{font-size:.85rem;color:#777;line-height:1.7}
.footer-qr{display:flex;gap:20px;margin-top:12px}
.footer-qr img{width:100px;height:100px;border-radius:8px;border:1px solid rgba(233,69,96,0.2)}
.footer-bottom{text-align:center;padding-top:20px;border-top:1px solid rgba(255,255,255,0.06);font-size:.8rem;color:#555}
.footer-bottom a{color:#777}

/* === 社交分享 === */
.share-bar{display:flex;justify-content:center;gap:16px;padding:20px 0}
.share-btn{padding:8px 20px;border-radius:20px;font-size:.85rem;border:1px solid rgba(255,255,255,0.15);color:#aaa;transition:all .3s;cursor:pointer;background:transparent}
.share-btn:hover{border-color:#E94560;color:#E94560}

/* === 面包屑 === */
.breadcrumb{padding:12px 0;font-size:.85rem;color:#666}
.breadcrumb a{color:#888}
.breadcrumb a:hover{color:#E94560}
.breadcrumb span{margin:0 6px;color:#444}

/* === 通用按钮 === */
.btn-primary{display:inline-block;padding:12px 32px;background:linear-gradient(135deg,#E94560,#c0392b);color:#fff;border-radius:25px;font-size:.95rem;transition:all .3s;border:none;cursor:pointer}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(233,69,96,0.3)}
.btn-outline{display:inline-block;padding:10px 28px;border:2px solid #E94560;color:#E94560;border-radius:25px;font-size:.9rem;transition:all .3s;background:transparent;cursor:pointer}
.btn-outline:hover{background:#E94560;color:#fff}

/* === 内页横幅 === */
.page-banner{position:relative;min-height:260px;display:flex;align-items:center;overflow:hidden}
.page-banner .banner-bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(0.4)}
.page-banner .banner-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(13,13,26,0.2),rgba(13,13,26,0.9))}
.page-banner .banner-content{position:relative;z-index:2;text-align:center;width:100%;padding:40px 20px}
.page-banner h1{font-size:2.2rem;margin-bottom:10px}
.page-banner p{color:#aaa;font-size:1rem}

/* === How-To指南 === */
.howto-steps{max-width:700px;margin:0 auto}
.howto-step{display:flex;gap:20px;margin-bottom:24px;align-items:flex-start}
.step-num{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,#E94560,#0F3460);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:1.1rem;flex-shrink:0}
.step-content h4{font-size:1rem;margin-bottom:4px}
.step-content p{font-size:.9rem;color:#999}

/* === 内容文章 === */
.article-content{max-width:800px;margin:0 auto;line-height:1.9;color:#ccc;font-size:.95rem}
.article-content h2{font-size:1.5rem;margin:30px 0 14px;color:#fff}
.article-content h3{font-size:1.2rem;margin:24px 0 10px;color:#E94560}
.article-content p{margin-bottom:16px}

/* === AI赋能模块 === */
.ai-features{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.ai-card{background:rgba(22,33,62,0.7);border-radius:12px;padding:28px;text-align:center;border:1px solid rgba(15,52,96,0.4);transition:all .3s}
.ai-card:hover{border-color:#E94560;transform:translateY(-4px)}
.ai-icon{font-size:2.4rem;margin-bottom:14px}
.ai-card h4{font-size:1.05rem;margin-bottom:8px}
.ai-card p{font-size:.85rem;color:#999}

/* === 社区功能 === */
.community-features{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.comm-card{background:rgba(22,33,62,0.6);border-radius:10px;padding:24px;border-left:3px solid #E94560;transition:transform .3s}
.comm-card:hover{transform:translateX(4px)}
.comm-card h4{font-size:1rem;margin-bottom:8px;color:#E94560}
.comm-card p{font-size:.85rem;color:#999}

/* === 响应式 === */
@media(max-width:1024px){
  .video-grid{grid-template-columns:repeat(2,1fr)}
  .expert-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
  .ai-features{grid-template-columns:repeat(2,1fr)}
  .community-features{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .header-inner{flex-wrap:wrap}
  .main-nav{display:none;flex-direction:column;width:100%;padding-top:10px}
  .main-nav.show{display:flex}
  .mobile-toggle{display:block}
  .main-nav a{padding:10px 0;border-bottom:1px solid rgba(255,255,255,0.05)}
  .hero-content h1{font-size:1.8rem}
  .video-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:1fr}
  .review-grid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .ai-features{grid-template-columns:1fr}
  .community-features{grid-template-columns:1fr}
  .section-wrap{padding:40px 0}
  .section-title h2{font-size:1.5rem}
}
@media(max-width:480px){
  .hero-content h1{font-size:1.5rem}
  .hero-content p{font-size:.95rem}
  .search-input-wrap{flex-direction:column;border-radius:12px}
  .search-input-wrap button{border-radius:0 0 10px 10px}
}

/* === 懒加载占位 === */
img[data-src]{opacity:0;transition:opacity .5s}
img.loaded{opacity:1}

/* === 动画 === */
@keyframes fadeInUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}
.fade-in{animation:fadeInUp .6s ease forwards}