/* ============================================
   抖音风 - 原创样式表
   品牌色: #FF6B35(橙) #E63946(红) #FFD166(金) #1D3557(深蓝) #457B9D(蓝)
   ============================================ */
*{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;color:#2b2b2b;background:#faf8f5;line-height:1.8}
a{color:#FF6B35;text-decoration:none;transition:color .3s}
a:hover{color:#E63946}
img{max-width:100%;height:auto;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* 头部导航 */
.site-header{background:linear-gradient(135deg,#1D3557 0%,#0d1b2a 100%);position:sticky;top:0;z-index:1000;box-shadow:0 2px 20px rgba(0,0,0,.3)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:10px 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-name{color:#FFD166;font-size:1.5rem;font-weight:700;letter-spacing:2px}
.main-nav{display:flex;gap:0}
.main-nav a{color:#e0e0e0;padding:12px 16px;font-size:.95rem;transition:all .3s;border-bottom:3px solid transparent}
.main-nav a:hover,.main-nav a.active{color:#FFD166;border-bottom-color:#FF6B35;background:rgba(255,107,53,.1)}
.mobile-menu-btn{display:none;background:none;border:none;color:#FFD166;font-size:1.5rem;cursor:pointer}

/* 搜索框 */
.search-bar{background:linear-gradient(90deg,#FF6B35,#E63946);padding:12px 0}
.search-bar .container{display:flex;justify-content:center}
.search-box{display:flex;max-width:600px;width:100%}
.search-box input{flex:1;padding:10px 20px;border:none;border-radius:25px 0 0 25px;font-size:1rem;outline:none}
.search-box button{padding:10px 25px;background:#1D3557;color:#FFD166;border:none;border-radius:0 25px 25px 0;cursor:pointer;font-size:1rem;transition:background .3s}
.search-box button:hover{background:#457B9D}

/* Hero横幅 */
.hero-section{position:relative;overflow:hidden;background:#1D3557}
.hero-section img{width:100%;height:auto;min-height:300px;object-fit:cover}
.hero-overlay{position:absolute;top:0;left:0;width:100%;height:100%;background:linear-gradient(to right,rgba(29,53,87,.85) 0%,rgba(29,53,87,.3) 60%,transparent 100%);display:flex;align-items:center}
.hero-content{padding:40px 60px;max-width:600px}
.hero-content h1{color:#FFD166;font-size:2.5rem;margin-bottom:15px;text-shadow:2px 2px 8px rgba(0,0,0,.5)}
.hero-content p{color:#e0e0e0;font-size:1.1rem;margin-bottom:25px;line-height:1.8}
.hero-content .btn-primary{display:inline-block;background:linear-gradient(135deg,#FF6B35,#E63946);color:#fff;padding:14px 35px;border-radius:30px;font-size:1.1rem;font-weight:600;transition:transform .3s,box-shadow .3s}
.hero-content .btn-primary:hover{transform:translateY(-3px);box-shadow:0 8px 25px rgba(255,107,53,.4)}

/* 通用区块标题 */
.section-title{text-align:center;padding:50px 0 30px}
.section-title h2{font-size:2rem;color:#1D3557;position:relative;display:inline-block}
.section-title h2::after{content:'';display:block;width:60px;height:4px;background:linear-gradient(90deg,#FF6B35,#FFD166);margin:12px auto 0;border-radius:2px}
.section-title p{color:#666;margin-top:10px;font-size:1rem}

/* 视频卡片网格 */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:25px;padding:20px 0 50px}
.video-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 15px rgba(0,0,0,.08);transition:transform .3s,box-shadow .3s;cursor:pointer}
.video-card:hover{transform:translateY(-8px);box-shadow:0 12px 35px rgba(255,107,53,.15)}
.video-card .thumb{position:relative;overflow:hidden;aspect-ratio:16/9}
.video-card .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.video-card:hover .thumb img{transform:scale(1.08)}
.video-card .x4ekntt{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:60px;height:60px;background:rgba(255,107,53,.85);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s}
.video-card:hover .x4ekntt{opacity:1}
.x4ekntt::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-card .card-body{padding:15px}
.video-card .card-body h3{font-size:1rem;color:#1D3557;margin-bottom:8px;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-card .xi4zj5hh{display:flex;justify-content:space-between;color:#999;font-size:.8rem}
.video-card .xi4zj5hh span{display:flex;align-items:center;gap:4px}
.video-card .tag{display:inline-block;background:#FFF3E6;color:#FF6B35;padding:2px 10px;border-radius:12px;font-size:.75rem;margin-bottom:8px}

/* 分类标签栏 */
.category-tabs{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;padding:20px 0}
.category-tabs a{padding:8px 22px;border-radius:20px;background:#f0f0f0;color:#555;font-size:.9rem;transition:all .3s}
.category-tabs a:hover,.category-tabs a.active{background:linear-gradient(135deg,#FF6B35,#E63946);color:#fff}

/* 专家展示 */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:30px;padding:20px 0 50px}
.expert-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 15px rgba(0,0,0,.08);text-align:center;padding:30px 20px;transition:transform .3s}
.expert-card:hover{transform:translateY(-5px)}
.expert-card img{width:120px;height:120px;border-radius:50%;object-fit:cover;margin:0 auto 15px;border:4px solid #FFD166}
.expert-card h4{color:#1D3557;font-size:1.1rem;margin-bottom:5px}
.expert-card .role{color:#FF6B35;font-size:.85rem;margin-bottom:10px}
.expert-card p{color:#666;font-size:.85rem;line-height:1.6;margin-bottom:15px}
.expert-card .expert-btns{display:flex;gap:10px;justify-content:center}
.expert-card .btn-sm{padding:6px 18px;border-radius:20px;font-size:.8rem;border:2px solid #FF6B35;color:#FF6B35;transition:all .3s}
.expert-card .btn-sm:hover{background:#FF6B35;color:#fff}

/* FAQ手风琴 */
.faq-section{background:#f5f0eb;padding:50px 0}
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#fff;border-radius:10px;margin-bottom:12px;overflow:hidden;box-shadow:0 2px 8px rgba(0,0,0,.05)}
.faq-item .faq-q{padding:18px 25px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;color:#1D3557;font-size:1rem;transition:background .3s}
.faq-item .faq-q:hover{background:#FFF3E6}
.faq-item .faq-q::after{content:'+';font-size:1.5rem;color:#FF6B35;transition:transform .3s}
.faq-item.active .faq-q::after{transform:rotate(45deg)}
.faq-item .faq-a{max-height:0;overflow:hidden;transition:max-height .4s ease;padding:0 25px}
.faq-item.active .faq-a{max-height:500px;padding:0 25px 18px}
.faq-item .faq-a p{color:#555;line-height:1.8;font-size:.95rem}

/* 用户评论 */
.reviews-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:25px;padding:20px 0 50px}
.review-card{background:#fff;border-radius:12px;padding:25px;box-shadow:0 4px 15px rgba(0,0,0,.08);position:relative}
.review-card::before{content:'\201C';position:absolute;top:10px;left:15px;font-size:4rem;color:#FFD166;opacity:.3;font-family:Georgia,serif}
.review-card .stars{color:#FFD166;font-size:1.1rem;margin-bottom:10px}
.review-card p{color:#555;font-size:.95rem;line-height:1.7;margin-bottom:15px;padding-left:10px}
.review-card .reviewer{display:flex;align-items:center;gap:10px}
.review-card .reviewer .avatar{width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,#FF6B35,#FFD166);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:.9rem}
.review-card .reviewer .info{font-size:.85rem;color:#999}
.review-card .reviewer .info strong{color:#1D3557;display:block}

/* 合作品牌 */
.x42gssc{background:#1D3557;padding:50px 0}
.x42gssc .section-title h2{color:#FFD166}
.x42gssc .section-title p{color:#a0b4c8}
.xhspygpm{text-align:center}
.xhspygpm img{max-width:800px;margin:0 auto;border-radius:12px}

/* How-To指南 */
.xwhax2{padding:50px 0}
.xb9gzjjf{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:25px;padding:20px 0}
.xb5nhn{background:#fff;border-radius:12px;padding:30px 20px;text-align:center;box-shadow:0 4px 15px rgba(0,0,0,.08)}
.xb5nhn .xc4m15tx{width:50px;height:50px;border-radius:50%;background:linear-gradient(135deg,#FF6B35,#E63946);color:#fff;display:flex;align-items:center;justify-content:center;font-size:1.3rem;font-weight:700;margin:0 auto 15px}
.xb5nhn h4{color:#1D3557;margin-bottom:10px}
.xb5nhn p{color:#666;font-size:.9rem}

/* 联系我们 */
.contact-section{background:#f5f0eb;padding:50px 0}
.contact-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:25px;padding:20px 0}
.contact-card{background:#fff;border-radius:12px;padding:25px;text-align:center;box-shadow:0 4px 15px rgba(0,0,0,.08)}
.contact-card h4{color:#1D3557;margin-bottom:10px}
.contact-card p{color:#666;font-size:.9rem;line-height:1.8}
.contact-card .icon{font-size:2.5rem;margin-bottom:10px}

/* 社交分享 */
.xwm3mrc{display:flex;gap:12px;justify-content:center;padding:20px 0;flex-wrap:wrap}
.xwm3mrc a{display:inline-flex;align-items:center;gap:6px;padding:8px 20px;border-radius:20px;color:#fff;font-size:.85rem;transition:transform .3s}
.xwm3mrc a:hover{transform:translateY(-3px);color:#fff}
.x3j03x{background:#07C160}
.xdajiprz9{background:#E6162D}
.xd5j4gi9{background:#161823}
.xzkdvk6v{background:#00A1D6}

/* 底部 */
.site-footer{background:linear-gradient(135deg,#0d1b2a 0%,#1D3557 100%);color:#a0b4c8;padding:40px 0 20px}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:30px;padding-bottom:30px}
.footer-col h4{color:#FFD166;margin-bottom:15px;font-size:1rem}
.footer-col p,.footer-col a{color:#a0b4c8;font-size:.85rem;line-height:2}
.footer-col a:hover{color:#FFD166}
.footer-col .x3887pb{width:120px;border-radius:8px;margin-top:10px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:20px;text-align:center;font-size:.8rem}
.footer-bottom a{color:#FFD166}

/* 面包屑 */
.breadcrumb{padding:15px 0;font-size:.85rem;color:#999}
.breadcrumb a{color:#FF6B35}
.breadcrumb span{margin:0 8px;color:#ccc}

/* 内页视频播放 */
.video-player-wrap{background:#000;border-radius:12px;overflow:hidden;margin:20px 0;aspect-ratio:16/9}
.video-player-wrap video{width:100%;height:100%;object-fit:contain}
.video-info{padding:20px 0}
.video-info h1{font-size:1.5rem;color:#1D3557;margin-bottom:10px}
.video-info .meta{display:flex;gap:20px;color:#999;font-size:.85rem;margin-bottom:15px;flex-wrap:wrap}
.video-info .desc{color:#555;line-height:1.8;font-size:.95rem}
.video-tags{display:flex;gap:8px;flex-wrap:wrap;margin:15px 0}
.video-tags a{padding:4px 14px;background:#FFF3E6;color:#FF6B35;border-radius:15px;font-size:.8rem;transition:all .3s}
.video-tags a:hover{background:#FF6B35;color:#fff}

/* 侧边推荐 */
.sidebar-list{display:flex;flex-direction:column;gap:15px}
.sidebar-item{display:flex;gap:12px;background:#fff;border-radius:10px;overflow:hidden;box-shadow:0 2px 8px rgba(0,0,0,.05);transition:transform .3s}
.sidebar-item:hover{transform:translateX(5px)}
.sidebar-item img{width:140px;height:80px;object-fit:cover;flex-shrink:0}
.sidebar-item .info{padding:8px 10px;display:flex;flex-direction:column;justify-content:center}
.sidebar-item .info h4{font-size:.85rem;color:#1D3557;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.sidebar-item .info span{font-size:.75rem;color:#999;margin-top:4px}

/* 分页 */
.pagination{display:flex;justify-content:center;gap:8px;padding:30px 0}
.pagination a,.pagination span{padding:8px 16px;border-radius:8px;font-size:.9rem}
.pagination a{background:#f0f0f0;color:#555;transition:all .3s}
.pagination a:hover{background:#FF6B35;color:#fff}
.pagination span.current{background:linear-gradient(135deg,#FF6B35,#E63946);color:#fff}

/* 弹幕模拟 */
.xpgsgsujy{position:relative;height:60px;overflow:hidden;background:rgba(29,53,87,.05);border-radius:8px;margin:20px 0}
.xvkjm0jj{position:absolute;white-space:nowrap;color:#1D3557;font-size:.85rem;animation:danmuMove 12s linear infinite;padding:4px 12px;background:rgba(255,209,102,.2);border-radius:15px}
@keyframes danmuMove{0%{transform:translateX(100vw)}100%{transform:translateX(-100%)}}

/* 响应式 */
@media(max-width:768px){
  .header-inner{flex-wrap:wrap}
  .main-nav{display:none;flex-direction:column;width:100%;background:#1D3557}
  .main-nav.show{display:flex}
  .mobile-menu-btn{display:block}
  .hero-content{padding:20px 25px}
  .hero-content h1{font-size:1.6rem}
  .video-grid{grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:12px}
  .expert-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .search-box{max-width:100%}
  .section-title h2{font-size:1.5rem}
  .contact-grid{grid-template-columns:1fr}
  .reviews-grid{grid-template-columns:1fr}
}
@media(max-width:480px){
  .footer-grid{grid-template-columns:1fr}
  .video-grid{grid-template-columns:1fr}
  .hero-content h1{font-size:1.3rem}
  .logo-wrap .brand-name{font-size:1.2rem}
}

/* 懒加载过渡 */
img[loading="lazy"]{transition:opacity .5s}
img.xh6qnig{opacity:0}
img.xh6qnig.loaded{opacity:1}

/* 动画 - 默认可见，JS加载后才启用动画 */
.js-ready .fade-in{opacity:0;transform:translateY(20px);transition:opacity .6s,transform .6s}
.js-ready .fade-in.visible,.fade-in.visible{opacity:1;transform:translateY(0)}