/* ============================================
   51视频 - 原创样式表
   品牌：51视频 | 域名：ch896764.cn
   配色：深紫 #1A0A2E / 活力橙 #FF6B35 / 薄荷绿 #00D4AA / 深夜蓝黑 #0D0D1A
   ============================================ */

/* === 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","Microsoft YaHei","Hiragino Sans GB",Arial,sans-serif;background:#0D0D1A;color:#E8E6F0;line-height:1.7;overflow-x:hidden}
a{color:#00D4AA;text-decoration:none;transition:color .3s}
a:hover{color:#FF6B35}
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-padding{padding:60px 0}

/* === 顶部导航 === */
.site-header{background:rgba(26,10,46,.95);backdrop-filter:blur(12px);position:sticky;top:0;z-index:1000;border-bottom:1px solid rgba(255,107,53,.15)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;max-width:1200px;margin:0 auto}
.logo-wrap{display:flex;align-items:center;gap:10px}
.logo-wrap img{height:48px;width:auto}
.logo-wrap .brand-text{font-size:1.4rem;font-weight:800;color:#FF6B35;letter-spacing:1px}
.main-nav{display:flex;align-items:center;gap:0}
.main-nav a{padding:10px 16px;font-size:.95rem;color:#E8E6F0;transition:all .3s;border-radius:6px}
.main-nav a:hover,.main-nav a.active{color:#FF6B35;background:rgba(255,107,53,.1)}
.nav-toggle{display:none;background:none;border:none;color:#FF6B35;font-size:1.5rem;cursor:pointer}

/* === 搜索框 === */
.search-bar{background:rgba(26,10,46,.8);padding:12px 0;border-bottom:1px solid rgba(0,212,170,.1)}
.search-bar .container{display:flex;justify-content:center}
.search-form{display:flex;max-width:560px;width:100%;border-radius:30px;overflow:hidden;border:2px solid rgba(255,107,53,.3);transition:border-color .3s}
.search-form:focus-within{border-color:#FF6B35}
.search-form input{flex:1;padding:10px 20px;background:rgba(13,13,26,.8);border:none;color:#E8E6F0;font-size:.95rem;outline:none}
.search-form input::placeholder{color:#7B7894}
.search-form button{padding:10px 24px;background:linear-gradient(135deg,#FF6B35,#FF8F5E);border:none;color:#fff;font-size:.95rem;cursor:pointer;transition:opacity .3s;font-weight:600}
.search-form button:hover{opacity:.85}

/* === Hero Banner === */
.hero-section{position:relative;min-height:520px;display:flex;align-items:center;overflow:hidden}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.55)}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(13,13,26,.3) 0%,rgba(26,10,46,.85) 100%)}
.hero-content{position:relative;z-index:2;text-align:center;width:100%;padding:60px 20px}
.hero-content h1{font-size:2.8rem;margin-bottom:16px;text-shadow:0 2px 20px rgba(0,0,0,.5)}
.hero-content h1 .highlight{color:#FF6B35}
.hero-content p{font-size:1.15rem;max-width:680px;margin:0 auto 28px;color:#C8C5D6}
.hero-tags{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin-top:20px}
.hero-tags span{padding:6px 16px;background:rgba(0,212,170,.12);border:1px solid rgba(0,212,170,.3);border-radius:20px;font-size:.85rem;color:#00D4AA}
.hero-btn{display:inline-block;padding:14px 36px;background:linear-gradient(135deg,#FF6B35,#FF8F5E);color:#fff;border-radius:30px;font-size:1.05rem;font-weight:600;transition:transform .3s,box-shadow .3s;box-shadow:0 4px 20px rgba(255,107,53,.3)}
.hero-btn:hover{transform:translateY(-2px);box-shadow:0 8px 30px rgba(255,107,53,.4);color:#fff}

/* === 通用标题 === */
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:2rem;margin-bottom:10px;position:relative;display:inline-block}
.section-title h2::after{content:'';display:block;width:60px;height:3px;background:linear-gradient(90deg,#FF6B35,#00D4AA);margin:10px auto 0;border-radius:2px}
.section-title p{color:#9B97B0;font-size:1rem;max-width:600px;margin:0 auto}

/* === 动漫视频卡片 === */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.video-card{background:rgba(26,10,46,.6);border-radius:12px;overflow:hidden;border:1px solid rgba(255,107,53,.1);transition:transform .3s,box-shadow .3s}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 40px rgba(255,107,53,.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(13,13,26,.5);opacity:0;transition:opacity .3s}
.video-card:hover .play-btn{opacity:1}
.play-btn span{width:60px;height:60px;background:rgba(255,107,53,.9);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:0}
.play-btn span::after{content:'';display:block;width:0;height:0;border-style:solid;border-width:12px 0 12px 22px;border-color:transparent transparent transparent #fff;margin-left:4px}
.video-info{padding:16px}
.video-info h3{font-size:1.05rem;margin-bottom:8px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.video-info .meta{display:flex;gap:12px;font-size:.82rem;color:#9B97B0}
.video-info .meta span{display:flex;align-items:center;gap:4px}
.video-info .tags{margin-top:8px;display:flex;flex-wrap:wrap;gap:6px}
.video-info .tags span{font-size:.75rem;padding:2px 10px;background:rgba(0,212,170,.1);color:#00D4AA;border-radius:12px}

/* === 影视传媒模块 === */
.media-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.media-card{background:rgba(26,10,46,.5);border-radius:12px;padding:28px 20px;text-align:center;border:1px solid rgba(255,107,53,.08);transition:all .3s}
.media-card:hover{border-color:rgba(255,107,53,.3);background:rgba(26,10,46,.8)}
.media-card .icon{font-size:2.2rem;margin-bottom:14px}
.media-card h4{font-size:1.05rem;margin-bottom:8px;color:#FF6B35}
.media-card p{font-size:.88rem;color:#9B97B0}

/* === AI赋能模块 === */
.ai-section{background:linear-gradient(135deg,rgba(26,10,46,.9),rgba(13,13,26,.95));position:relative;overflow:hidden}
.ai-section::before{content:'';position:absolute;width:400px;height:400px;background:radial-gradient(circle,rgba(0,212,170,.08),transparent);top:-100px;right:-100px;border-radius:50%}
.ai-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:24px}
.ai-card{background:rgba(0,212,170,.05);border:1px solid rgba(0,212,170,.15);border-radius:12px;padding:28px;transition:all .3s}
.ai-card:hover{border-color:rgba(0,212,170,.4);transform:translateY(-4px)}
.ai-card h4{color:#00D4AA;font-size:1.1rem;margin-bottom:10px}
.ai-card p{font-size:.9rem;color:#9B97B0}

/* === 社区模块 === */
.community-section{position:relative}
.community-banner{width:100%;border-radius:16px;margin-bottom:30px;overflow:hidden}
.community-banner img{width:100%;height:300px;object-fit:cover}
.community-features{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px}
.community-feat{background:rgba(26,10,46,.6);border-radius:10px;padding:20px;text-align:center;border:1px solid rgba(255,107,53,.08);transition:all .3s}
.community-feat:hover{border-color:#FF6B35}
.community-feat .icon{font-size:1.8rem;margin-bottom:10px}
.community-feat h5{font-size:.95rem;margin-bottom:6px;color:#FF6B35}
.community-feat p{font-size:.82rem;color:#9B97B0}

/* === 专家展示 === */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:24px}
.expert-card{background:rgba(26,10,46,.6);border-radius:12px;overflow:hidden;border:1px solid rgba(255,107,53,.1);transition:all .3s}
.expert-card:hover{transform:translateY(-4px);box-shadow:0 8px 30px rgba(255,107,53,.1)}
.expert-avatar{width:100%;height:260px;object-fit:cover}
.expert-info{padding:20px}
.expert-info h4{font-size:1.1rem;margin-bottom:4px}
.expert-info .role{color:#FF6B35;font-size:.88rem;margin-bottom:10px}
.expert-info p{font-size:.85rem;color:#9B97B0;margin-bottom:12px}
.expert-info .expert-btns{display:flex;gap:10px}
.expert-info .expert-btns a{padding:6px 16px;border-radius:20px;font-size:.82rem;font-weight:600;transition:all .3s}
.btn-contact{background:rgba(255,107,53,.15);color:#FF6B35;border:1px solid rgba(255,107,53,.3)}
.btn-contact:hover{background:#FF6B35;color:#fff}
.btn-works{background:rgba(0,212,170,.1);color:#00D4AA;border:1px solid rgba(0,212,170,.3)}
.btn-works:hover{background:#00D4AA;color:#0D0D1A}

/* === 合作品牌 === */
.partner-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:30px;align-items:center}
.partner-item{background:rgba(26,10,46,.5);border-radius:10px;padding:16px 28px;border:1px solid rgba(255,107,53,.08);font-size:1rem;font-weight:600;color:#9B97B0;transition:all .3s;min-width:140px;text-align:center}
.partner-item:hover{border-color:#FF6B35;color:#FF6B35}

/* === FAQ === */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:rgba(26,10,46,.5);border-radius:10px;margin-bottom:12px;border:1px solid rgba(255,107,53,.08);overflow:hidden}
.faq-question{padding:18px 24px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;font-size:1rem;transition:all .3s}
.faq-question:hover{color:#FF6B35}
.faq-question .arrow{transition:transform .3s;color:#FF6B35;font-size:1.2rem}
.faq-item.active .faq-question .arrow{transform:rotate(180deg)}
.faq-answer{padding:0 24px;max-height:0;overflow:hidden;transition:all .4s ease;font-size:.9rem;color:#9B97B0}
.faq-item.active .faq-answer{padding:0 24px 18px;max-height:300px}

/* === 用户评论 === */
.review-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px}
.review-card{background:rgba(26,10,46,.6);border-radius:12px;padding:24px;border:1px solid rgba(255,107,53,.08)}
.review-card .stars{color:#FF6B35;font-size:1rem;margin-bottom:10px;letter-spacing:2px}
.review-card .review-text{font-size:.9rem;color:#C8C5D6;margin-bottom:14px;font-style:italic;line-height:1.6}
.review-card .reviewer{display:flex;align-items:center;gap:10px}
.reviewer-avatar{width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,#FF6B35,#00D4AA);display:flex;align-items:center;justify-content:center;font-weight:700;color:#fff;font-size:.9rem}
.reviewer-name{font-size:.88rem;font-weight:600}
.reviewer-date{font-size:.78rem;color:#7B7894}

/* === 底部 === */
.site-footer{background:rgba(26,10,46,.95);border-top:1px solid rgba(255,107,53,.15);padding:50px 0 0}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:30px;margin-bottom:40px}
.footer-col h4{font-size:1rem;color:#FF6B35;margin-bottom:16px;position:relative;padding-bottom:10px}
.footer-col h4::after{content:'';position:absolute;bottom:0;left:0;width:30px;height:2px;background:#FF6B35}
.footer-col p,.footer-col li{font-size:.88rem;color:#9B97B0;margin-bottom:8px}
.footer-col li a{color:#9B97B0}
.footer-col li a:hover{color:#FF6B35}
.footer-qr{display:flex;gap:20px;margin-top:10px}
.footer-qr img{width:100px;height:100px;border-radius:8px;border:1px solid rgba(255,107,53,.15)}
.footer-bottom{border-top:1px solid rgba(255,107,53,.1);padding:20px 0;text-align:center;font-size:.82rem;color:#7B7894}
.footer-bottom .update-time{margin-top:6px;color:#9B97B0}
.social-share{display:flex;justify-content:center;gap:16px;margin-bottom:20px}
.social-share a{width:40px;height:40px;border-radius:50%;background:rgba(255,107,53,.1);display:flex;align-items:center;justify-content:center;color:#FF6B35;font-size:.9rem;transition:all .3s;border:1px solid rgba(255,107,53,.2)}
.social-share a:hover{background:#FF6B35;color:#fff}

/* === 面包屑 === */
.breadcrumb{padding:14px 0;font-size:.85rem;color:#7B7894}
.breadcrumb a{color:#9B97B0}
.breadcrumb a:hover{color:#FF6B35}
.breadcrumb span{margin:0 8px;color:#7B7894}

/* === How-To 指南 === */
.howto-steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px}
.howto-step{background:rgba(26,10,46,.5);border-radius:12px;padding:24px;text-align:center;border:1px solid rgba(0,212,170,.1);position:relative}
.howto-step .step-num{width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,#FF6B35,#FF8F5E);display:flex;align-items:center;justify-content:center;font-weight:700;color:#fff;margin:0 auto 14px;font-size:1.1rem}
.howto-step h5{font-size:1rem;margin-bottom:8px;color:#00D4AA}
.howto-step p{font-size:.85rem;color:#9B97B0}

/* === 联系我们 === */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}
.contact-card{background:rgba(26,10,46,.6);border-radius:12px;padding:28px;border:1px solid rgba(255,107,53,.08)}
.contact-card h4{color:#FF6B35;font-size:1.05rem;margin-bottom:14px}
.contact-card p{font-size:.9rem;color:#9B97B0;margin-bottom:8px}
.contact-card .label{color:#C8C5D6;font-weight:600}

/* === 响应式 === */
@media(max-width:768px){
  .header-inner{flex-wrap:wrap}
  .main-nav{display:none;width:100%;flex-direction:column;padding-top:10px}
  .main-nav.open{display:flex}
  .nav-toggle{display:block}
  .hero-content h1{font-size:1.8rem}
  .hero-content p{font-size:.95rem}
  .media-grid{grid-template-columns:1fr}
  .video-grid{grid-template-columns:repeat(auto-fill,minmax(220px,1fr))}
  .expert-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .section-padding{padding:40px 0}
  .section-title h2{font-size:1.5rem}
}
@media(max-width:480px){
  .footer-grid{grid-template-columns:1fr}
  .video-grid{grid-template-columns:1fr}
  .hero-section{min-height:380px}
  .hero-content h1{font-size:1.5rem}
  .search-form{flex-direction:column;border-radius:12px}
  .search-form button{border-radius:0 0 12px 12px}
}

/* === 懒加载 === */
img.lazy{opacity:0;transition:opacity .5s}
img.lazy.loaded{opacity:1}

/* === 动画 === */
.fade-in{opacity:0;transform:translateY(20px);transition:all .6s ease}
.fade-in.visible{opacity:1;transform:translateY(0)}

/* === 内页通用 === */
.page-hero{padding:80px 0 40px;text-align:center;background:linear-gradient(135deg,rgba(26,10,46,.9),rgba(13,13,26,.95))}
.page-hero h1{font-size:2.2rem;margin-bottom:10px}
.page-hero p{color:#9B97B0;font-size:1rem}
.page-content{padding:40px 0 60px}
.page-content p{margin-bottom:16px;font-size:.95rem;color:#C8C5D6}
.page-content h2{font-size:1.6rem;margin:30px 0 16px;color:#FF6B35}
.page-content h3{font-size:1.3rem;margin:24px 0 12px}