/* ==========================================
   51视频 原创样式表 - 赛博霓虹主题
   配色：活力橙#FF6B35 + 深海蓝黑#1B2838 + 霓虹青绿#00D4AA
   ========================================== */
*{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",sans-serif;color:#E6EDF3;background:#0D1117;line-height:1.8}
a{color:#00D4AA;text-decoration:none;transition:color .3s}
a:hover{color:#FF6B35}
img{max-width:100%;height:auto;display:block}
.wrap{max-width:1200px;margin:0 auto;padding:0 20px}
h1,h2,h3,h4,h5,h6{font-weight:700;line-height:1.4}
h1{font-size:2.2rem}
h2{font-size:1.8rem}
h3{font-size:1.3rem}

/* 头部导航 */
.site-header{background:linear-gradient(135deg,#0D1117 0%,#1B2838 100%);padding:12px 0;position:sticky;top:0;z-index:1000;border-bottom:2px solid #FF6B35}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between}
.brand-link{display:flex;align-items:center;gap:10px}
.brand-link img{height:48px;width:auto}
.brand-link span{font-size:1.4rem;font-weight:700;color:#FF6B35;letter-spacing:2px}
.main-nav{display:flex;gap:18px;list-style:none;flex-wrap:wrap}
.main-nav a{color:#E6EDF3;font-size:.92rem;padding:6px 12px;border-radius:4px;transition:all .3s}
.main-nav a:hover,.main-nav a.active{background:#FF6B35;color:#0D1117}
.nav-toggle{display:none;background:none;border:none;color:#FF6B35;font-size:1.6rem;cursor:pointer}

/* 搜索框 */
.search-bar{background:#161B22;padding:12px 0;border-bottom:1px solid rgba(255,107,53,.2)}
.search-bar form{display:flex;max-width:600px;margin:0 auto}
.search-bar input{flex:1;padding:10px 16px;border:2px solid #00D4AA;border-right:none;border-radius:6px 0 0 6px;background:#0D1117;color:#E6EDF3;font-size:.95rem}
.search-bar input::placeholder{color:#8B949E}
.search-bar button{padding:10px 24px;background:linear-gradient(135deg,#FF6B35,#00D4AA);color:#fff;border:none;border-radius:0 6px 6px 0;cursor:pointer;font-size:.95rem;transition:opacity .3s}
.search-bar button:hover{opacity:.85}

/* 面包屑 */
.breadcrumb{padding:10px 0;font-size:.85rem;color:#8B949E;background:#0D1117}
.breadcrumb a{color:#00D4AA;font-size:.85rem}
.breadcrumb span{margin:0 6px}

/* Banner */
.hero-banner{position:relative;min-height:520px;background-size:cover;background-position:center;display:flex;align-items:center;overflow:hidden}
.hero-banner::before{content:"";position:absolute;inset:0;background:linear-gradient(to right,rgba(13,17,23,.94) 0%,rgba(27,40,56,.7) 50%,rgba(255,107,53,.15) 100%)}
.hero-banner .wrap{position:relative;z-index:2}
.hero-content{max-width:650px}
.hero-content h1{color:#FF6B35;font-size:2.6rem;margin-bottom:16px;text-shadow:0 2px 8px rgba(0,0,0,.5)}
.hero-content h1 span{color:#00D4AA}
.hero-content p{color:#ccc;font-size:1.05rem;margin-bottom:20px}
.hero-tags{display:inline-flex;gap:8px;flex-wrap:wrap}
.hero-tags span{background:rgba(0,212,170,.12);color:#00D4AA;padding:4px 14px;border-radius:20px;font-size:.8rem;border:1px solid rgba(0,212,170,.25)}
.hero-actions{display:flex;gap:12px;margin-top:24px;flex-wrap:wrap}
.btn-primary{display:inline-block;padding:12px 28px;background:linear-gradient(135deg,#FF6B35,#e85a28);color:#fff;border-radius:6px;font-weight:600;transition:transform .3s,box-shadow .3s;border:none;cursor:pointer}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(255,107,53,.4);color:#fff}
.btn-outline{display:inline-block;padding:12px 28px;border:2px solid #00D4AA;color:#00D4AA;border-radius:6px;font-weight:600;transition:all .3s}
.btn-outline:hover{background:#00D4AA;color:#0D1117}
.hero-date{font-size:.8rem;color:#8B949E;margin-top:8px}

/* 数据统计 */
.stats-strip{background:linear-gradient(135deg,#1B2838,#161B22);padding:40px 0;border-top:1px solid rgba(0,212,170,.2);border-bottom:1px solid rgba(0,212,170,.2)}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.stats-grid div{padding:20px}
.stats-grid .num{font-size:2.4rem;font-weight:700;color:#FF6B35;display:block}
.stats-grid .label{color:#8B949E;font-size:.9rem;margin-top:4px}

/* 通用section */
.sec{padding:60px 0}
.sec-dark{background:#0D1117}
.sec-alt{background:#161B22}
.sec-gradient{background:linear-gradient(180deg,#0D1117 0%,#161B22 100%)}
.sec-head{text-align:center;margin-bottom:40px}
.sec-head h2{color:#FF6B35;margin-bottom:10px}
.sec-head p{color:#8B949E;max-width:700px;margin:0 auto;font-size:.95rem}

/* 动漫卡片 */
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.vcard{background:#161B22;border-radius:10px;overflow:hidden;transition:transform .3s,box-shadow .3s;border:1px solid rgba(0,212,170,.08)}
.vcard:hover{transform:translateY(-6px);box-shadow:0 12px 30px rgba(255,107,53,.2)}
.vcard-thumb{position:relative;overflow:hidden;aspect-ratio:16/9}
.vcard-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.vcard:hover .vcard-thumb img{transform:scale(1.05)}
.play-overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(13,17,23,.5);opacity:0;transition:opacity .3s}
.vcard:hover .play-overlay{opacity:1}
.play-overlay span{width:60px;height:60px;background:rgba(255,107,53,.9);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.4rem;color:#fff;box-shadow:0 4px 15px rgba(255,107,53,.5)}
.vcard-body{padding:16px}
.vcard-body h3{color:#E6EDF3;font-size:1.05rem;margin-bottom:8px}
.vcard-body p{color:#8B949E;font-size:.85rem;line-height:1.6}
.vcard-stats{display:flex;gap:12px;margin-top:10px;font-size:.8rem;color:#8B949E}
.vcard-stats span{display:flex;align-items:center;gap:4px}
.vtag{display:inline-block;background:rgba(0,212,170,.15);color:#00D4AA;padding:2px 10px;border-radius:12px;font-size:.75rem;margin-top:8px}

/* 社区板块 */
.comm-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.comm-card{background:linear-gradient(135deg,rgba(27,40,56,.6),rgba(13,17,23,.8));border:1px solid rgba(0,212,170,.12);border-radius:10px;padding:24px;transition:all .3s;text-align:center}
.comm-card:hover{border-color:#FF6B35;transform:translateY(-4px)}
.comm-card .icon{font-size:2.4rem;margin-bottom:12px}
.comm-card h3{color:#FF6B35;font-size:1.1rem;margin-bottom:8px}
.comm-card p{color:#8B949E;font-size:.85rem}

/* 专家卡片 */
.expert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.expert-card{background:#161B22;border-radius:10px;overflow:hidden;border:1px solid rgba(0,212,170,.08);text-align:center;padding-bottom:20px;transition:transform .3s}
.expert-card:hover{transform:translateY(-4px)}
.expert-card img{width:100%;aspect-ratio:3/4;object-fit:cover}
.expert-card h3{color:#FF6B35;margin:12px 0 4px;font-size:1rem;padding:0 12px}
.expert-card .role{color:#8B949E;font-size:.85rem;padding:0 12px}
.expert-card .cred{color:#E6EDF3;font-size:.8rem;padding:4px 12px}
.expert-card .actions{display:flex;gap:8px;justify-content:center;margin-top:12px;padding:0 12px}
.expert-card .actions a{padding:6px 14px;font-size:.8rem;border-radius:4px}

/* AI赋能 */
.ai-layout{display:grid;grid-template-columns:1fr 1fr;gap:30px;align-items:center}
.ai-layout img{border-radius:10px;border:2px solid rgba(0,212,170,.15)}
.ai-features{list-style:none}
.ai-features li{padding:14px 0;border-bottom:1px solid rgba(0,212,170,.08);color:#8B949E;font-size:.95rem}
.ai-features li strong{color:#FF6B35}

/* FAQ手风琴 */
.faq-wrap{max-width:800px;margin:0 auto}
.faq-item{border:1px solid rgba(0,212,170,.12);border-radius:8px;margin-bottom:12px;overflow:hidden}
.faq-item summary{padding:16px 20px;background:#161B22;color:#E6EDF3;cursor:pointer;font-weight:600;font-size:.95rem;list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq-item summary::after{content:"+";font-size:1.2rem;color:#FF6B35;transition:transform .3s}
.faq-item[open] summary::after{content:"-"}
.faq-item .faq-body{padding:16px 20px;background:#0D1117;color:#8B949E;font-size:.9rem;line-height:1.8}

/* 用户评论 */
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.review-card{background:#161B22;border-radius:10px;padding:24px;border:1px solid rgba(0,212,170,.08)}
.review-card .stars{color:#FFD700;margin-bottom:8px;font-size:1rem}
.review-card p{color:#8B949E;font-size:.9rem;font-style:italic;margin-bottom:12px}
.review-card .reviewer{color:#FF6B35;font-size:.85rem;font-weight:600}
.review-card .reviewer span{color:#8B949E;font-weight:400}

/* 合作品牌 */
.brand-wall{text-align:center}
.brand-wall img{max-width:100%;border-radius:10px;border:2px solid rgba(0,212,170,.15)}

/* How-To */
.howto-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:step}
.step-card{background:#161B22;border-radius:10px;padding:24px;text-align:center;border:1px solid rgba(0,212,170,.08);counter-increment:step;position:relative}
.step-card::before{content:counter(step);position:absolute;top:-14px;left:50%;transform:translateX(-50%);width:32px;height:32px;background:#FF6B35;color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.9rem}
.step-card h4{color:#00D4AA;margin:12px 0 8px;font-size:1rem}
.step-card p{color:#8B949E;font-size:.85rem}

/* 社交分享 */
.share-row{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.share-row a{display:inline-flex;align-items:center;gap:6px;padding:10px 20px;border-radius:6px;color:#fff;font-size:.9rem;transition:transform .3s}
.share-row a:hover{transform:translateY(-2px);color:#fff}
.share-row .wx{background:#07C160}
.share-row .wb{background:#E6162D}
.share-row .dy{background:#161823;border:1px solid #333}
.share-row .bz{background:#00A1D6}

/* 热门话题 */
.topic-box{background:rgba(255,107,53,.1);border:1px solid rgba(255,107,53,.2);border-radius:8px;padding:16px 20px;margin-top:20px}
.topic-box h3{color:#E6EDF3;font-size:1rem;margin-bottom:8px}
.topic-box p{color:#8B949E;font-size:.85rem}
.tag-row{display:flex;gap:8px;flex-wrap:wrap;margin-top:8px}
.tag-row span{background:rgba(0,212,170,.12);color:#00D4AA;padding:4px 12px;border-radius:16px;font-size:.78rem;border:1px solid rgba(0,212,170,.18)}

/* 页脚 */
.site-footer{background:linear-gradient(135deg,#0D1117,#1B2838);padding:50px 0 20px;border-top:2px solid #FF6B35}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px;margin-bottom:30px}
.footer-grid h5{color:#FF6B35;font-size:1rem;margin-bottom:14px}
.footer-grid p,.footer-grid a{color:#8B949E;font-size:.85rem;line-height:2}
.footer-grid a:hover{color:#00D4AA}
.footer-grid ul{list-style:none}
.footer-grid ul li a{display:block}
.footer-qr{display:flex;gap:16px;margin-top:16px}
.footer-qr img{width:100px;height:100px;border-radius:6px;border:1px solid rgba(0,212,170,.15)}
.footer-bottom{text-align:center;padding-top:20px;border-top:1px solid rgba(0,212,170,.08);color:#8B949E;font-size:.8rem}
.footer-bottom a{color:#FF6B35}

/* MCP前端代码块 */
.mcp-block{background:#161B22;border:1px solid rgba(0,212,170,.15);border-radius:8px;padding:16px;margin-top:20px;font-size:.8rem;color:#8B949E}

/* 回到顶部 */
.back-top{position:fixed;bottom:30px;right:30px;width:44px;height:44px;background:#FF6B35;color:#fff;border:none;border-radius:50%;font-size:1.2rem;cursor:pointer;display:none;z-index:999;transition:opacity .3s;box-shadow:0 4px 12px rgba(255,107,53,.4)}
.back-top:hover{opacity:.85}

/* 响应式 */
@media(max-width:1024px){
  .card-grid,.comm-grid,.review-grid{grid-template-columns:repeat(2,1fr)}
  .expert-grid{grid-template-columns:repeat(2,1fr)}
  .ai-layout{grid-template-columns:1fr}
  .howto-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .main-nav{display:none;flex-direction:column;position:absolute;top:100%;left:0;right:0;background:#0D1117;padding:20px;border-top:2px solid #FF6B35;z-index:999}
  .main-nav.open{display:flex}
  .nav-toggle{display:block}
  .card-grid,.comm-grid,.review-grid,.howto-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .hero-banner{min-height:400px}
  .hero-content h1{font-size:1.8rem}
  .footer-grid{grid-template-columns:1fr}
  h1{font-size:1.6rem}
  h2{font-size:1.4rem}
}
@media(max-width:480px){
  .stats-grid{grid-template-columns:1fr 1fr}
  .share-row{flex-direction:column;align-items:center}
}

/* 懒加载 */
img[loading="lazy"]{transition:opacity .5s}
img[loading="lazy"].loaded{opacity:1}

/* 动画 */
@keyframes fadeInUp{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}
.animate-in{animation:fadeInUp .6s ease forwards}