/* ============================================
   幼幼视频社区 - 原创样式表
   品牌色系：深邃蓝黑 + 活力红
   ============================================ */

/* === 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:#0D0D1A;color:#E8E8F0;line-height:1.7;overflow-x:hidden}
a{color:#E94560;text-decoration:none;transition:color .3s}
a:hover{color:#FF6B81}
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:#F5F5F5}

/* === 容器 === */
.container{max-width:1280px;margin:0 auto;padding:0 20px}
.section-wrap{padding:60px 0}

/* === 头部导航 === */
.site-header{position:fixed;top:0;left:0;width:100%;z-index:1000;background:rgba(13,13,26,.95);backdrop-filter:blur(12px);border-bottom:1px solid rgba(233,69,96,.15);transition:all .3s}
.site-header .container{display:flex;align-items:center;justify-content:space-between;height:70px}
.logo-wrap{display:flex;align-items:center;gap:10px}
.logo-wrap img{height:48px;width:auto}
.logo-wrap .brand-name{font-size:1.6rem;font-weight:800;color:#E94560;letter-spacing:2px}
.main-nav{display:flex;align-items:center;gap:6px}
.main-nav a{padding:8px 16px;font-size:.95rem;color:#C8C8D8;border-radius:6px;transition:all .3s}
.main-nav a:hover,.main-nav a.active{color:#fff;background:linear-gradient(135deg,#E94560,#0F3460)}
.mobile-menu-btn{display:none;background:none;border:none;color:#E94560;font-size:1.5rem;cursor:pointer}

/* === 搜索框 === */
.search-bar-wrap{background:rgba(15,52,96,.3);padding:16px 0;border-bottom:1px solid rgba(233,69,96,.1)}
.search-bar{display:flex;max-width:680px;margin:0 auto;position:relative}
.search-bar input{flex:1;padding:12px 20px;border:2px solid rgba(233,69,96,.3);border-radius:30px 0 0 30px;background:rgba(26,26,46,.8);color:#F5F5F5;font-size:1rem;outline:none;transition:border-color .3s}
.search-bar input:focus{border-color:#E94560}
.search-bar input::placeholder{color:#666}
.search-bar button{padding:12px 28px;background:linear-gradient(135deg,#E94560,#C23152);color:#fff;border:none;border-radius:0 30px 30px 0;font-size:1rem;cursor:pointer;transition:all .3s}
.search-bar button:hover{background:linear-gradient(135deg,#FF6B81,#E94560)}

/* === Banner === */
.hero-banner{position:relative;height:75vh;min-height:500px;margin-top:70px;overflow:hidden;display:flex;align-items:center;justify-content:center}
.hero-banner .bg-img{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover;filter:brightness(.55)}
.hero-banner .overlay{position:absolute;top:0;left:0;width:100%;height:100%;background:linear-gradient(180deg,rgba(13,13,26,.3) 0%,rgba(13,13,26,.85) 100%)}
.hero-content{position:relative;z-index:2;text-align:center;padding:0 20px;max-width:900px}
.hero-content h1{font-size:3.2rem;margin-bottom:16px;background:linear-gradient(135deg,#E94560,#FF6B81,#0F3460);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-content .subtitle{font-size:1.3rem;color:#C8C8D8;margin-bottom:24px}
.hero-content .hero-tags{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin-bottom:28px}
.hero-content .hero-tags span{padding:6px 16px;background:rgba(233,69,96,.15);border:1px solid rgba(233,69,96,.3);border-radius:20px;font-size:.85rem;color:#E94560}
.hero-cta{display:inline-flex;gap:16px;flex-wrap:wrap;justify-content:center}
.btn-primary{padding:14px 36px;background:linear-gradient(135deg,#E94560,#C23152);color:#fff;border:none;border-radius:30px;font-size:1.05rem;font-weight:600;cursor:pointer;transition:all .3s;display:inline-block}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 25px rgba(233,69,96,.4);color:#fff}
.btn-outline{padding:14px 36px;background:transparent;color:#E94560;border:2px solid #E94560;border-radius:30px;font-size:1.05rem;font-weight:600;cursor:pointer;transition:all .3s;display:inline-block}
.btn-outline:hover{background:#E94560;color:#fff;transform:translateY(-2px)}

/* === 区块标题 === */
.section-title{text-align:center;margin-bottom:48px}
.section-title h2{font-size:2.2rem;margin-bottom:10px;position:relative;display:inline-block}
.section-title h2::after{content:"";display:block;width:60px;height:3px;background:linear-gradient(90deg,#E94560,#0F3460);margin:12px auto 0;border-radius:2px}
.section-title p{color:#999;font-size:1rem;margin-top:8px}

/* === 视频卡片 === */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:24px}
.video-card{background:rgba(26,26,46,.6);border-radius:14px;overflow:hidden;border:1px solid rgba(233,69,96,.1);transition:all .4s;position:relative}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 35px rgba(233,69,96,.2);border-color:rgba(233,69,96,.3)}
.video-thumb{position:relative;padding-top:56.25%;overflow:hidden;cursor:pointer}
.video-thumb img{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover;transition:transform .5s}
.video-card:hover .video-thumb img{transform:scale(1.08)}
.play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:64px;height:64px;background:rgba(233,69,96,.85);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:all .3s;pointer-events:none}
.play-btn::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:hover .play-btn{opacity:1}
.video-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.75);color:#fff;padding:2px 8px;border-radius:4px;font-size:.8rem}
.video-info{padding:16px}
.video-info h3{font-size:1.05rem;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;align-items:center;gap:14px;color:#888;font-size:.85rem}
.video-meta span{display:flex;align-items:center;gap:4px}
.video-tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}
.video-tags span{padding:3px 10px;background:rgba(233,69,96,.1);border-radius:12px;font-size:.75rem;color:#E94560}

/* === 修车传媒 === */
.media-categories{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px;margin-bottom:36px}
.media-cat-item{text-align:center;padding:24px 16px;background:rgba(26,26,46,.5);border-radius:12px;border:1px solid rgba(233,69,96,.1);transition:all .3s;cursor:pointer}
.media-cat-item:hover{border-color:#E94560;background:rgba(233,69,96,.08)}
.media-cat-item .icon{font-size:2.2rem;margin-bottom:10px}
.media-cat-item h4{font-size:1rem;color:#E8E8F0}
.media-cat-item p{font-size:.8rem;color:#888;margin-top:4px}

/* === AI赋能 === */
.ai-features{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.ai-card{padding:32px 24px;background:linear-gradient(145deg,rgba(15,52,96,.3),rgba(26,26,46,.6));border-radius:16px;border:1px solid rgba(15,52,96,.4);transition:all .4s;position:relative;overflow:hidden}
.ai-card::before{content:"";position:absolute;top:-50%;right:-50%;width:100%;height:100%;background:radial-gradient(circle,rgba(233,69,96,.08) 0%,transparent 70%);transition:all .5s}
.ai-card:hover::before{top:-30%;right:-30%}
.ai-card:hover{border-color:rgba(233,69,96,.4);transform:translateY(-4px)}
.ai-card .ai-icon{font-size:2.5rem;margin-bottom:16px}
.ai-card h3{font-size:1.2rem;margin-bottom:10px;color:#E94560}
.ai-card p{font-size:.9rem;color:#AAA;line-height:1.6}

/* === 专家展示 === */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:28px}
.expert-card{background:rgba(26,26,46,.6);border-radius:16px;overflow:hidden;border:1px solid rgba(233,69,96,.1);transition:all .4s;text-align:center}
.expert-card:hover{transform:translateY(-5px);box-shadow:0 10px 30px rgba(233,69,96,.15)}
.expert-avatar{width:120px;height:120px;border-radius:50%;margin:28px auto 16px;border:3px solid #E94560;overflow:hidden}
.expert-avatar img{width:100%;height:100%;object-fit:cover}
.expert-card h3{font-size:1.15rem;margin-bottom:4px}
.expert-card .role{color:#E94560;font-size:.9rem;margin-bottom:12px}
.expert-card .bio{padding:0 20px;font-size:.85rem;color:#999;line-height:1.6;margin-bottom:16px}
.expert-card .awards{padding:0 20px;margin-bottom:16px}
.expert-card .awards span{display:inline-block;padding:3px 10px;background:rgba(233,69,96,.1);border-radius:10px;font-size:.75rem;color:#E94560;margin:3px}
.expert-actions{display:flex;gap:10px;justify-content:center;padding:0 20px 24px}
.expert-actions a{padding:8px 18px;border-radius:20px;font-size:.85rem;transition:all .3s}
.expert-actions .btn-sm-primary{background:linear-gradient(135deg,#E94560,#C23152);color:#fff}
.expert-actions .btn-sm-outline{border:1px solid #E94560;color:#E94560}
.expert-actions .btn-sm-outline:hover{background:#E94560;color:#fff}

/* === 合作品牌墙 === */
.brand-wall{display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:40px;padding:20px 0}
.brand-wall .brand-item{width:140px;height:80px;display:flex;align-items:center;justify-content:center;background:rgba(26,26,46,.5);border-radius:12px;border:1px solid rgba(233,69,96,.1);padding:12px;transition:all .3s;filter:grayscale(.6);opacity:.7}
.brand-wall .brand-item:hover{filter:grayscale(0);opacity:1;border-color:#E94560}

/* === FAQ === */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{margin-bottom:12px;border:1px solid rgba(233,69,96,.15);border-radius:12px;overflow:hidden;background:rgba(26,26,46,.5)}
.faq-question{padding:18px 24px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-size:1rem;font-weight:600;color:#E8E8F0;transition:all .3s}
.faq-question:hover{color:#E94560}
.faq-question .arrow{transition:transform .3s;color:#E94560;font-size:1.2rem}
.faq-item.active .faq-question .arrow{transform:rotate(180deg)}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .4s ease;padding:0 24px}
.faq-item.active .faq-answer{max-height:300px;padding:0 24px 18px}
.faq-answer p{font-size:.9rem;color:#AAA;line-height:1.7}

/* === 用户评论 === */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px}
.review-card{padding:24px;background:rgba(26,26,46,.6);border-radius:14px;border:1px solid rgba(233,69,96,.1);transition:all .3s}
.review-card:hover{border-color:rgba(233,69,96,.3)}
.review-header{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.review-header .avatar{width:48px;height:48px;border-radius:50%;background:linear-gradient(135deg,#E94560,#0F3460);display:flex;align-items:center;justify-content:center;font-size:1.2rem;color:#fff;font-weight:700}
.review-header .user-info h4{font-size:.95rem;color:#E8E8F0}
.review-header .user-info .date{font-size:.8rem;color:#777}
.review-stars{color:#E94560;margin-bottom:10px;font-size:.9rem;letter-spacing:2px}
.review-text{font-size:.9rem;color:#BBB;line-height:1.7}

/* === 社区模块 === */
.community-tabs{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin-bottom:32px}
.community-tabs .tab-btn{padding:10px 22px;border:1px solid rgba(233,69,96,.3);border-radius:25px;background:transparent;color:#C8C8D8;font-size:.9rem;cursor:pointer;transition:all .3s}
.community-tabs .tab-btn:hover,.community-tabs .tab-btn.active{background:linear-gradient(135deg,#E94560,#0F3460);color:#fff;border-color:transparent}

/* === How-To指南 === */
.howto-steps{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:24px;counter-reset:step}
.howto-step{padding:28px 20px;background:rgba(26,26,46,.5);border-radius:14px;border:1px solid rgba(233,69,96,.1);text-align:center;position:relative;counter-increment:step;transition:all .3s}
.howto-step:hover{border-color:#E94560;transform:translateY(-3px)}
.howto-step::before{content:counter(step);display:flex;align-items:center;justify-content:center;width:48px;height:48px;background:linear-gradient(135deg,#E94560,#0F3460);border-radius:50%;font-size:1.3rem;font-weight:700;color:#fff;margin:0 auto 16px}
.howto-step h4{font-size:1.05rem;margin-bottom:8px}
.howto-step p{font-size:.85rem;color:#999}

/* === 联系我们 === */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.contact-card{padding:28px;background:rgba(26,26,46,.6);border-radius:14px;border:1px solid rgba(233,69,96,.1);text-align:center;transition:all .3s}
.contact-card:hover{border-color:#E94560}
.contact-card .icon{font-size:2rem;color:#E94560;margin-bottom:12px}
.contact-card h4{font-size:1.05rem;margin-bottom:8px}
.contact-card p{font-size:.9rem;color:#AAA}

/* === 分享按钮 === */
.share-bar{display:flex;justify-content:center;gap:14px;padding:20px 0}
.share-btn{width:44px;height:44px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.1rem;color:#fff;transition:all .3s;cursor:pointer;border:none}
.share-btn:hover{transform:translateY(-3px);box-shadow:0 6px 18px rgba(0,0,0,.3)}
.share-btn.wechat{background:#07C160}
.share-btn.weibo{background:#E6162D}
.share-btn.douyin{background:#161823}
.share-btn.bilibili{background:#00A1D6}

/* === 页脚 === */
.site-footer{background:rgba(10,10,20,.95);border-top:1px solid rgba(233,69,96,.15);padding:48px 0 24px}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:32px;margin-bottom:36px}
.footer-col h4{font-size:1.05rem;margin-bottom:16px;color:#E94560}
.footer-col p,.footer-col a{font-size:.88rem;color:#888;line-height:2}
.footer-col a:hover{color:#E94560}
.footer-qr{display:flex;gap:20px;margin-top:12px}
.footer-qr .qr-item{text-align:center}
.footer-qr .qr-item img{width:110px;height:110px;border-radius:8px;border:1px solid rgba(233,69,96,.2)}
.footer-qr .qr-item span{display:block;font-size:.75rem;color:#888;margin-top:6px}
.footer-bottom{text-align:center;padding-top:24px;border-top:1px solid rgba(233,69,96,.1);font-size:.85rem;color:#666}
.footer-bottom .update-time{margin-top:6px;font-size:.8rem;color:#555}

/* === 面包屑 === */
.breadcrumb{padding:14px 0;font-size:.85rem;color:#888}
.breadcrumb a{color:#E94560}
.breadcrumb span{margin:0 8px;color:#555}

/* === 内页通用 === */
.page-hero{padding:100px 0 50px;text-align:center;background:linear-gradient(180deg,rgba(15,52,96,.3),rgba(13,13,26,.9))}
.page-hero h1{font-size:2.4rem;margin-bottom:10px}
.page-hero p{color:#999;font-size:1rem}

/* === 响应式 === */
@media(max-width:1024px){
  .hero-content h1{font-size:2.4rem}
  .section-title h2{font-size:1.8rem}
  .video-grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr))}
}
@media(max-width:768px){
  .main-nav{display:none;position:absolute;top:70px;left:0;width:100%;background:rgba(13,13,26,.98);flex-direction:column;padding:20px;gap:4px}
  .main-nav.show{display:flex}
  .mobile-menu-btn{display:block}
  .hero-banner{height:60vh;min-height:400px}
  .hero-content h1{font-size:1.8rem}
  .hero-content .subtitle{font-size:1rem}
  .section-wrap{padding:40px 0}
  .section-title h2{font-size:1.5rem}
  .video-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:1fr}
  .review-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .search-bar{margin:0 15px}
  .brand-wall{gap:20px}
  .brand-wall .brand-item{width:100px;height:60px}
}
@media(max-width:480px){
  .hero-content h1{font-size:1.5rem}
  .btn-primary,.btn-outline{padding:12px 24px;font-size:.9rem}
  .container{padding:0 15px}
}

/* === 懒加载占位 === */
.lazy-img{opacity:0;transition:opacity .5s}
.lazy-img.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}

/* === 智能服务占位 === */
.x8vlu91p{padding:20px;background:rgba(26,26,46,.4);border-radius:12px;border:1px dashed rgba(233,69,96,.2);text-align:center;margin-top:20px}
.x8vlu91p p{color:#666;font-size:.85rem}