/* ============================================
   51视频 - 原创样式表
   配色：藏蓝 #1A2B4A / 活力橙 #FF6B35 / 薄荷绿 #00D4AA
   ============================================ */

/* --- 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:#2D3142;background:#F8F6F2;line-height:1.7;overflow-x:hidden}
a{color:#FF6B35;text-decoration:none;transition:color .3s}
a:hover{color:#00D4AA}
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:#1A2B4A}

/* --- 容器 --- */
.wrap{max-width:1200px;margin:0 auto;padding:0 20px}

/* --- 顶部导航 --- */
.site-header{background:#1A2B4A;position:sticky;top:0;z-index:1000;box-shadow:0 2px 12px rgba(26,43,74,.25)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand-logo{display:flex;align-items:center;gap:10px}
.brand-logo img{height:42px;width:auto}
.brand-logo span{color:#fff;font-size:1.25rem;font-weight:700;letter-spacing:1px}
.main-nav{display:flex;gap:6px}
.main-nav a{color:rgba(255,255,255,.85);padding:8px 16px;border-radius:6px;font-size:.95rem;transition:all .3s}
.main-nav a:hover,.main-nav a.cur{background:#FF6B35;color:#fff}
.mob-toggle{display:none;background:none;border:none;cursor:pointer;padding:6px}
.mob-toggle span{display:block;width:26px;height:3px;background:#fff;border-radius:2px;margin:5px 0;transition:.3s}

/* --- 搜索栏 --- */
.search-bar{background:linear-gradient(135deg,#1A2B4A 0%,#2a4270 100%);padding:14px 0}
.search-wrap{display:flex;max-width:620px;margin:0 auto}
.search-wrap input{flex:1;padding:10px 18px;border:2px solid #FF6B35;border-right:none;border-radius:8px 0 0 8px;font-size:.95rem;outline:none;background:#fff;color:#2D3142}
.search-wrap input::placeholder{color:#aaa}
.search-wrap button{padding:10px 28px;background:#FF6B35;color:#fff;border:2px solid #FF6B35;border-radius:0 8px 8px 0;font-size:.95rem;cursor:pointer;transition:background .3s}
.search-wrap button:hover{background:#e55a28}

/* --- Hero 区域 --- */
.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-content{position:relative;z-index:2;text-align:center;width:100%;padding:60px 20px}
.hero-content h1{color:#fff;font-size:2.8rem;margin-bottom:16px;text-shadow:0 2px 8px rgba(0,0,0,.4)}
.hero-content h1 em{font-style:normal;color:#FF6B35}
.hero-content p{color:rgba(255,255,255,.9);font-size:1.15rem;max-width:680px;margin:0 auto 28px}
.hero-btns{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.btn-primary{display:inline-block;padding:12px 32px;background:#FF6B35;color:#fff;border-radius:8px;font-weight:600;font-size:1rem;transition:all .3s;border:2px solid #FF6B35}
.btn-primary:hover{background:transparent;color:#FF6B35}
.btn-outline{display:inline-block;padding:12px 32px;background:transparent;color:#fff;border:2px solid #00D4AA;border-radius:8px;font-weight:600;font-size:1rem;transition:all .3s}
.btn-outline:hover{background:#00D4AA;color:#1A2B4A}
.hero-tags{margin-top:24px;display:flex;gap:10px;justify-content:center;flex-wrap:wrap}
.hero-tags a{background:rgba(255,255,255,.15);color:#fff;padding:5px 14px;border-radius:20px;font-size:.82rem;backdrop-filter:blur(4px);transition:background .3s}
.hero-tags a:hover{background:#FF6B35}

/* --- 通用板块 --- */
.section{padding:60px 0}
.section-alt{background:#EDE8E0}
.section-dark{background:#1A2B4A;color:#fff}
.section-dark h2,.section-dark h3,.section-dark h4{color:#fff}
.sec-head{text-align:center;margin-bottom:42px}
.sec-head h2{font-size:2rem;margin-bottom:10px;position:relative;display:inline-block}
.sec-head h2::after{content:'';display:block;width:50px;height:4px;background:#FF6B35;margin:10px auto 0;border-radius:2px}
.sec-head p{color:#666;font-size:1rem;max-width:600px;margin:0 auto}
.section-dark .sec-head p{color:rgba(255,255,255,.7)}

/* --- 动漫视频卡片 --- */
.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.video-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 16px rgba(0,0,0,.06);transition:transform .3s,box-shadow .3s}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 32px rgba(0,0,0,.12)}
.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(1.06)}
.play-btn{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(26,43,74,.45);opacity:0;transition:opacity .3s}
.video-card:hover .play-btn{opacity:1}
.play-btn i{width:56px;height:56px;background:#FF6B35;border-radius:50%;display:flex;align-items:center;justify-content:center}
.play-btn i::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:1.05rem;margin-bottom:6px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.video-info p{color:#888;font-size:.85rem}
.video-stats{display:flex;gap:14px;margin-top:8px;font-size:.8rem;color:#aaa}
.video-stats span{display:flex;align-items:center;gap:4px}
.tag-label{display:inline-block;background:#FF6B35;color:#fff;padding:2px 10px;border-radius:4px;font-size:.75rem;margin-bottom:6px}

/* --- 影视传媒模块 --- */
.media-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.media-item{background:#fff;border-radius:10px;padding:28px 22px;text-align:center;box-shadow:0 2px 10px rgba(0,0,0,.05);transition:all .3s}
.media-item:hover{transform:translateY(-4px);box-shadow:0 8px 24px rgba(0,0,0,.1)}
.media-icon{width:60px;height:60px;background:linear-gradient(135deg,#FF6B35,#ff9a6c);border-radius:14px;display:flex;align-items:center;justify-content:center;margin:0 auto 16px;font-size:1.6rem;color:#fff}
.media-item h4{font-size:1.1rem;margin-bottom:8px}
.media-item p{color:#777;font-size:.88rem}

/* --- AI赋能模块 --- */
.ai-features{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.ai-card{background:linear-gradient(135deg,#1A2B4A 0%,#2a4270 100%);border-radius:12px;padding:32px;color:#fff;position:relative;overflow:hidden}
.ai-card::before{content:'';position:absolute;top:-30px;right:-30px;width:120px;height:120px;background:rgba(0,212,170,.15);border-radius:50%}
.ai-card h4{font-size:1.15rem;margin-bottom:10px;color:#00D4AA}
.ai-card p{color:rgba(255,255,255,.8);font-size:.9rem}

/* --- 社区模块 --- */
.community-flex{display:flex;gap:24px;flex-wrap:wrap}
.community-card{flex:1;min-width:260px;background:#fff;border-radius:12px;padding:28px;border-left:4px solid #00D4AA;box-shadow:0 2px 10px rgba(0,0,0,.05)}
.community-card h4{color:#1A2B4A;margin-bottom:8px;font-size:1.05rem}
.community-card p{color:#777;font-size:.88rem}

/* --- 专家展示 --- */
.expert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.expert-card{background:#fff;border-radius:12px;overflow:hidden;text-align:center;box-shadow:0 4px 14px rgba(0,0,0,.06);transition:transform .3s}
.expert-card:hover{transform:translateY(-4px)}
.expert-avatar{width:100%;aspect-ratio:1;overflow:hidden}
.expert-avatar img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.expert-card:hover .expert-avatar img{transform:scale(1.05)}
.expert-detail{padding:18px 14px}
.expert-detail h4{font-size:1rem;margin-bottom:4px}
.expert-detail .role{color:#FF6B35;font-size:.82rem;margin-bottom:8px}
.expert-detail p{color:#888;font-size:.82rem;margin-bottom:12px}
.expert-links{display:flex;gap:8px;justify-content:center}
.expert-links a{padding:5px 14px;border-radius:6px;font-size:.78rem;font-weight:600}
.expert-links .link-contact{background:#FF6B35;color:#fff}
.expert-links .link-work{background:#EDE8E0;color:#1A2B4A}

/* --- 合作品牌墙 --- */
.partner-wall{display:flex;flex-wrap:wrap;gap:20px;justify-content:center;align-items:center}
.partner-wall .p-item{background:#fff;border-radius:10px;padding:18px 28px;box-shadow:0 2px 8px rgba(0,0,0,.05);font-weight:700;color:#1A2B4A;font-size:1rem;transition:all .3s}
.partner-wall .p-item:hover{box-shadow:0 6px 18px rgba(0,0,0,.1);transform:translateY(-2px)}

/* --- How-To 指南 --- */
.howto-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:step}
.howto-step{background:#fff;border-radius:10px;padding:28px 20px;text-align:center;box-shadow:0 2px 10px rgba(0,0,0,.05);position:relative}
.howto-step::before{counter-increment:step;content:counter(step);display:flex;align-items:center;justify-content:center;width:40px;height:40px;background:#FF6B35;color:#fff;border-radius:50%;font-weight:700;font-size:1.1rem;margin:0 auto 14px}
.howto-step h4{font-size:1rem;margin-bottom:8px}
.howto-step p{color:#777;font-size:.85rem}

/* --- FAQ --- */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#fff;border-radius:10px;margin-bottom:12px;box-shadow:0 2px 8px rgba(0,0,0,.04);overflow:hidden}
.faq-q{padding:18px 24px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-size:1rem;transition:background .3s}
.faq-q:hover{background:#f5f2ed}
.faq-q::after{content:'+';font-size:1.4rem;color:#FF6B35;transition:transform .3s}
.faq-item.open .faq-q::after{transform:rotate(45deg)}
.faq-a{padding:0 24px;max-height:0;overflow:hidden;transition:all .4s;color:#666;font-size:.92rem}
.faq-item.open .faq-a{padding:0 24px 18px;max-height:400px}

/* --- 用户评论 --- */
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.review-card{background:#fff;border-radius:12px;padding:24px;box-shadow:0 2px 10px rgba(0,0,0,.05)}
.review-head{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.review-avatar{width:44px;height:44px;border-radius:50%;background:#FF6B35;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:1.1rem}
.review-name h5{font-size:.95rem;margin-bottom:2px}
.review-name span{color:#aaa;font-size:.78rem}
.review-stars{color:#FF6B35;font-size:.85rem;margin-bottom:10px;letter-spacing:2px}
.review-card p{color:#666;font-size:.88rem;line-height:1.6}

/* --- 联系我们 --- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:32px}
.contact-info{display:flex;flex-direction:column;gap:16px}
.contact-row{display:flex;align-items:flex-start;gap:12px}
.contact-icon{width:40px;height:40px;background:#FF6B35;border-radius:10px;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;flex-shrink:0}
.contact-row h5{font-size:.95rem;margin-bottom:2px}
.contact-row p{color:#777;font-size:.88rem}
.contact-qr{display:flex;gap:24px;justify-content:center;align-items:flex-start}
.qr-item{text-align:center}
.qr-item img{width:160px;height:160px;border-radius:10px;margin-bottom:8px;box-shadow:0 2px 10px rgba(0,0,0,.08)}
.qr-item p{font-size:.85rem;color:#666}

/* --- MCP服务前端 --- */
.mcp-panel{background:#fff;border-radius:12px;padding:24px;max-width:600px;margin:20px auto 0;box-shadow:0 2px 10px rgba(0,0,0,.05)}
.mcp-panel h4{font-size:1rem;margin-bottom:12px;color:#1A2B4A}
.mcp-status{display:flex;align-items:center;gap:8px;margin-bottom:10px}
.mcp-dot{width:10px;height:10px;background:#00D4AA;border-radius:50%;animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}
.mcp-log{background:#1A2B4A;color:#00D4AA;border-radius:8px;padding:14px;font-family:monospace;font-size:.82rem;max-height:120px;overflow-y:auto}

/* --- 页脚 --- */
.site-footer{background:#1A2B4A;color:rgba(255,255,255,.8);padding:48px 0 0}
.footer-top{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;padding-bottom:32px;border-bottom:1px solid rgba(255,255,255,.1)}
.footer-brand p{color:rgba(255,255,255,.6);font-size:.88rem;margin-top:12px;line-height:1.7}
.footer-col h5{color:#fff;font-size:1rem;margin-bottom:14px;position:relative;padding-bottom:8px}
.footer-col h5::after{content:'';position:absolute;bottom:0;left:0;width:28px;height:3px;background:#FF6B35;border-radius:2px}
.footer-col a{display:block;color:rgba(255,255,255,.6);font-size:.88rem;margin-bottom:8px;transition:color .3s}
.footer-col a:hover{color:#FF6B35}
.footer-bottom{text-align:center;padding:20px 0;font-size:.82rem;color:rgba(255,255,255,.5)}
.footer-social{display:flex;gap:12px;justify-content:center;margin-bottom:12px}
.footer-social a{width:36px;height:36px;border-radius:50%;background:rgba(255,255,255,.1);display:flex;align-items:center;justify-content:center;color:#fff;font-size:.85rem;transition:background .3s}
.footer-social a:hover{background:#FF6B35}

/* --- 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%;cursor:pointer;font-size:1.2rem;display:none;align-items:center;justify-content:center;box-shadow:0 4px 12px rgba(255,107,53,.35);transition:all .3s;z-index:999}
.back-top.show{display:flex}
.back-top:hover{background:#1A2B4A}

/* --- 面包屑 --- */
.breadcrumb{padding:14px 0;font-size:.85rem;color:#888}
.breadcrumb a{color:#FF6B35}
.breadcrumb span{margin:0 6px;color:#ccc}

/* --- 内页通用 --- */
.page-hero{background:#1A2B4A;padding:48px 0;text-align:center}
.page-hero h1{color:#fff;font-size:2rem;margin-bottom:8px}
.page-hero p{color:rgba(255,255,255,.7);font-size:1rem}
.page-content{padding:40px 0}
.page-content h2{font-size:1.6rem;margin:28px 0 14px;padding-bottom:8px;border-bottom:2px solid #EDE8E0}
.page-content h3{font-size:1.25rem;margin:20px 0 10px;color:#FF6B35}
.page-content p{margin-bottom:14px;color:#555;font-size:.95rem}
.page-content ul{margin:10px 0 14px 20px}
.page-content ul li{margin-bottom:6px;color:#555;font-size:.92rem;position:relative;padding-left:16px}
.page-content ul li::before{content:'';position:absolute;left:0;top:10px;width:6px;height:6px;background:#FF6B35;border-radius:50%}

/* --- 响应式 --- */
@media(max-width:1024px){
  .video-grid,.media-grid,.review-grid{grid-template-columns:repeat(2,1fr)}
  .expert-grid{grid-template-columns:repeat(2,1fr)}
  .howto-steps{grid-template-columns:repeat(2,1fr)}
  .footer-top{grid-template-columns:1fr 1fr}
  .ai-features{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
}
@media(max-width:768px){
  .nav-inner{flex-wrap:wrap}
  .main-nav{display:none;width:100%;flex-direction:column;padding:10px 0}
  .main-nav.open{display:flex}
  .mob-toggle{display:block}
  .hero-content h1{font-size:1.8rem}
  .hero-section{min-height:380px}
  .video-grid,.media-grid,.review-grid,.expert-grid{grid-template-columns:1fr}
  .howto-steps{grid-template-columns:1fr}
  .footer-top{grid-template-columns:1fr}
  .contact-qr{flex-direction:column;align-items:center}
  .sec-head h2{font-size:1.5rem}
  .partner-wall .p-item{padding:12px 18px;font-size:.88rem}
}
@media(max-width:480px){
  .hero-content h1{font-size:1.5rem}
  .hero-btns{flex-direction:column;align-items:center}
  .search-wrap{flex-direction:column}
  .search-wrap input{border-right:2px solid #FF6B35;border-radius:8px 8px 0 0}
  .search-wrap button{border-radius:0 0 8px 8px}
}