/* ========================================
   幼幼 - 原创样式表
   配色：活力橙 #FF6B35 / 深夜蓝 #1A1A2E / 玫瑰红 #E94560
   ======================================== */

/* 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","Helvetica Neue",Arial,sans-serif;background:#0F0F23;color:#EAEAEA;line-height:1.8;overflow-x:hidden}
a{color:#FF6B35;text-decoration:none;transition:color .3s}
a:hover{color:#E94560}
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}

/* 容器 */
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.section-title{text-align:center;font-size:2rem;margin-bottom:15px;color:#FF6B35;position:relative;padding-bottom:15px}
.section-title::after{content:"";display:block;width:80px;height:3px;background:linear-gradient(90deg,#FF6B35,#E94560);margin:12px auto 0;border-radius:2px}
.section-desc{text-align:center;color:#aab;font-size:1rem;margin-bottom:40px;max-width:700px;margin-left:auto;margin-right:auto}

/* 头部导航 */
.site-header{background:#1A1A2E;position:sticky;top:0;z-index:1000;box-shadow:0 2px 20px rgba(0,0,0,.5);border-bottom:1px solid rgba(255,107,53,.15)}
.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:42px;width:auto}
.logo-wrap span{font-size:1.3rem;font-weight:700;background:linear-gradient(135deg,#FF6B35,#E94560);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.main-nav{display:flex;gap:5px}
.main-nav a{padding:8px 14px;border-radius:6px;font-size:.9rem;color:#EAEAEA;transition:all .3s}
.main-nav a:hover,.main-nav a.active{background:rgba(255,107,53,.15);color:#FF6B35}
.nav-toggle{display:none;background:none;border:none;color:#FF6B35;font-size:1.5rem;cursor:pointer}

/* 搜索框 */
.search-bar{background:#16213E;padding:12px 0;border-bottom:1px solid rgba(255,107,53,.1)}
.search-bar .container{display:flex;justify-content:center}
.search-box{display:flex;max-width:560px;width:100%}
.search-box input{flex:1;padding:10px 18px;border:2px solid rgba(255,107,53,.3);border-right:none;border-radius:25px 0 0 25px;background:#0F0F23;color:#EAEAEA;font-size:.95rem;outline:none;transition:border-color .3s}
.search-box input:focus{border-color:#FF6B35}
.search-box button{padding:10px 24px;background:linear-gradient(135deg,#FF6B35,#E94560);color:#fff;border:none;border-radius:0 25px 25px 0;cursor:pointer;font-size:.95rem;transition:opacity .3s}
.search-box button:hover{opacity:.85}

/* Banner */
.hero-banner{position:relative;min-height:480px;display:flex;align-items:center;justify-content:center;text-align:center;overflow:hidden}
.hero-banner .bg-img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;filter:brightness(.45)}
.hero-content{position:relative;z-index:2;padding:40px 20px;max-width:800px}
.hero-content h1{font-size:2.8rem;margin-bottom:16px;background:linear-gradient(135deg,#FF6B35,#E94560);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-content p{font-size:1.15rem;color:#ddd;margin-bottom:24px;line-height:1.9}
.hero-content .btn-group{display:flex;gap:15px;justify-content:center;flex-wrap:wrap}
.btn-primary{display:inline-block;padding:12px 32px;background:linear-gradient(135deg,#FF6B35,#E94560);color:#fff;border-radius:30px;font-weight:600;transition:transform .3s,box-shadow .3s;border:none;cursor:pointer;font-size:1rem}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 25px rgba(233,69,96,.4);color:#fff}
.btn-outline{display:inline-block;padding:12px 32px;border:2px solid #FF6B35;color:#FF6B35;border-radius:30px;font-weight:600;transition:all .3s;font-size:1rem}
.btn-outline:hover{background:#FF6B35;color:#fff}

/* 面包屑 */
.breadcrumb{padding:12px 0;font-size:.85rem;color:#888}
.breadcrumb a{color:#FF6B35}
.breadcrumb span{margin:0 6px;color:#555}

/* 视频卡片网格 */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:25px;margin-bottom:50px}
.video-card{background:#16213E;border-radius:12px;overflow:hidden;transition:transform .3s,box-shadow .3s;position:relative}
.video-card:hover{transform:translateY(-5px);box-shadow:0 12px 35px rgba(255,107,53,.2)}
.video-thumb{position:relative;padding-top:56.25%;overflow:hidden;cursor:pointer}
.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;opacity:0;transition:opacity .3s;background:rgba(0,0,0,.4)}
.video-card:hover .play-btn{opacity:1}
.play-btn svg{width:60px;height:60px;fill:#FF6B35;filter:drop-shadow(0 2px 8px rgba(0,0,0,.5))}
.video-info{padding:16px}
.video-info h3{font-size:1.05rem;margin-bottom:8px;color:#EAEAEA;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;gap:15px;font-size:.8rem;color:#888}
.video-meta span{display:flex;align-items:center;gap:4px}
.video-tags{display:flex;gap:6px;flex-wrap:wrap;margin-top:10px}
.video-tags span{background:rgba(255,107,53,.12);color:#FF6B35;padding:3px 10px;border-radius:12px;font-size:.75rem}

/* 模块卡片 */
.module-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:25px;margin-bottom:50px}
.module-card{background:#16213E;border-radius:12px;padding:30px 24px;text-align:center;transition:transform .3s,box-shadow .3s;border:1px solid rgba(255,107,53,.08)}
.module-card:hover{transform:translateY(-5px);box-shadow:0 12px 35px rgba(255,107,53,.15);border-color:rgba(255,107,53,.25)}
.module-card .icon{font-size:2.5rem;margin-bottom:15px}
.module-card h3{font-size:1.1rem;margin-bottom:10px;color:#FF6B35}
.module-card p{font-size:.9rem;color:#aab;line-height:1.7}

/* 专家展示 */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:25px;margin-bottom:50px}
.expert-card{background:#16213E;border-radius:12px;overflow:hidden;text-align:center;transition:transform .3s;border:1px solid rgba(255,107,53,.08)}
.expert-card:hover{transform:translateY(-5px);box-shadow:0 12px 35px rgba(255,107,53,.15)}
.expert-card .avatar{width:120px;height:120px;border-radius:50%;margin:25px auto 15px;object-fit:cover;border:3px solid #FF6B35}
.expert-card h3{font-size:1.05rem;color:#EAEAEA;margin-bottom:5px}
.expert-card .role{color:#FF6B35;font-size:.85rem;margin-bottom:10px}
.expert-card p{font-size:.85rem;color:#aab;padding:0 20px;line-height:1.7}
.expert-card .expert-links{display:flex;gap:10px;justify-content:center;padding:15px 0;flex-wrap:wrap}
.expert-card .expert-links a{padding:6px 16px;border-radius:20px;font-size:.8rem;border:1px solid #FF6B35;color:#FF6B35;transition:all .3s}
.expert-card .expert-links a:hover{background:#FF6B35;color:#fff}

/* FAQ */
.faq-list{max-width:800px;margin:0 auto 50px}
.faq-item{background:#16213E;border-radius:10px;margin-bottom:12px;overflow:hidden;border:1px solid rgba(255,107,53,.08)}
.faq-question{padding:18px 24px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;color:#EAEAEA;transition:background .3s}
.faq-question:hover{background:rgba(255,107,53,.08)}
.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:max-height .4s ease,padding .4s ease;color:#aab;line-height:1.8;font-size:.95rem}
.faq-item.active .faq-answer{max-height:300px;padding:0 24px 18px}

/* 用户评论 */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:25px;margin-bottom:50px}
.review-card{background:#16213E;border-radius:12px;padding:24px;border:1px solid rgba(255,107,53,.08)}
.review-card .stars{color:#FF6B35;margin-bottom:10px;font-size:1.1rem}
.review-card .review-text{font-size:.95rem;color:#ccc;line-height:1.8;margin-bottom:12px;font-style:italic}
.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,#E94560);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:.9rem}
.review-card .reviewer-info .name{font-weight:600;color:#EAEAEA;font-size:.9rem}
.review-card .reviewer-info .date{font-size:.8rem;color:#888}

/* 联系我们 */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:30px;margin-bottom:50px}
.contact-card{background:#16213E;border-radius:12px;padding:30px;border:1px solid rgba(255,107,53,.08)}
.contact-card h3{color:#FF6B35;margin-bottom:15px;font-size:1.1rem}
.contact-card p{color:#aab;line-height:2;font-size:.9rem}
.contact-card .qr-img{width:160px;margin:15px auto 0;border-radius:8px}

/* 页脚 */
.site-footer{background:#1A1A2E;border-top:1px solid rgba(255,107,53,.15);padding:40px 0 20px}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:30px;margin-bottom:30px}
.footer-col h4{color:#FF6B35;margin-bottom:15px;font-size:1rem}
.footer-col p,.footer-col a{color:#aab;font-size:.85rem;line-height:2}
.footer-col a:hover{color:#FF6B35}
.footer-col .footer-logo{height:36px;margin-bottom:10px}
.footer-bottom{text-align:center;padding-top:20px;border-top:1px solid rgba(255,107,53,.1);color:#666;font-size:.8rem}
.footer-bottom a{color:#FF6B35}

/* 社交分享 */
.share-bar{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin:30px 0}
.share-btn{padding:8px 20px;border-radius:20px;font-size:.85rem;border:1px solid rgba(255,107,53,.3);color:#EAEAEA;transition:all .3s;cursor:pointer;background:transparent}
.share-btn:hover{background:rgba(255,107,53,.15);border-color:#FF6B35;color:#FF6B35}

/* 合作品牌 */
.partner-wall{display:flex;gap:30px;justify-content:center;flex-wrap:wrap;align-items:center;margin-bottom:40px;padding:30px;background:#16213E;border-radius:12px}
.partner-wall .partner-item{padding:15px 25px;background:rgba(255,107,53,.06);border-radius:8px;color:#aab;font-size:.95rem;border:1px solid rgba(255,107,53,.1);transition:all .3s}
.partner-wall .partner-item:hover{border-color:#FF6B35;color:#FF6B35}

/* How-To 指南 */
.howto-steps{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:25px;margin-bottom:40px}
.howto-step{background:#16213E;border-radius:12px;padding:25px;text-align:center;border:1px solid rgba(255,107,53,.08);position:relative}
.howto-step .step-num{width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,#FF6B35,#E94560);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;margin:0 auto 15px;font-size:1.1rem}
.howto-step h4{color:#FF6B35;margin-bottom:8px}
.howto-step p{color:#aab;font-size:.9rem;line-height:1.7}

/* 内页通用 */
.page-hero{padding:60px 0 40px;text-align:center;background:linear-gradient(180deg,#1A1A2E,#0F0F23)}
.page-hero h1{font-size:2.2rem;background:linear-gradient(135deg,#FF6B35,#E94560);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:12px}
.page-hero p{color:#aab;font-size:1rem;max-width:600px;margin:0 auto}
.page-content{padding:40px 0 60px}
.article-body{max-width:900px;margin:0 auto;line-height:2;font-size:1rem;color:#ccc}
.article-body h2{color:#FF6B35;font-size:1.5rem;margin:35px 0 15px;padding-bottom:10px;border-bottom:2px solid rgba(255,107,53,.2)}
.article-body h3{color:#EAEAEA;font-size:1.2rem;margin:25px 0 10px}
.article-body p{margin-bottom:18px}

/* 区块间距 */
.section{padding:60px 0}
.section:nth-child(even){background:rgba(22,33,62,.4)}

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

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

/* 响应式 */
@media(max-width:768px){
  .header-inner{flex-wrap:wrap}
  .main-nav{display:none;flex-direction:column;width:100%;padding:10px 0}
  .main-nav.show{display:flex}
  .nav-toggle{display:block}
  .hero-content h1{font-size:1.8rem}
  .hero-banner{min-height:360px}
  .section-title{font-size:1.5rem}
  .video-grid{grid-template-columns:1fr}
  .module-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}
  .howto-steps{grid-template-columns:1fr}
  .search-box{max-width:100%}
}
@media(max-width:480px){
  .hero-content h1{font-size:1.4rem}
  .hero-content p{font-size:.95rem}
  .btn-primary,.btn-outline{padding:10px 22px;font-size:.9rem}
}