/* ============================================
   兄妹乱伦 - 原创CSS样式表
   品牌色系：樱粉 #FF6B9D / 暮紫 #6B2FA0 / 暖金 #F5A623 / 墨黑 #1A1A2E / 雪白 #FAFAFA
   Lumnuv.cn
   ============================================ */

/* === 基础重置 === */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",Arial,sans-serif;color:#2D2D3A;background:#FAFAFA;line-height:1.7;overflow-x:hidden}
a{color:#6B2FA0;text-decoration:none;transition:color .3s}
a:hover{color:#FF6B9D}
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:#1A1A2E}

/* === 容器 === */
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}

/* === 顶部导航 === */
.site-header{background:linear-gradient(135deg,#1A1A2E 0%,#2D1B4E 100%);position:sticky;top:0;z-index:1000;box-shadow:0 2px 20px rgba(107,47,160,.3)}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;padding:10px 20px;max-width:1200px;margin:0 auto}
.nav-logo{display:flex;align-items:center;gap:10px}
.nav-logo img{height:42px;width:auto;border-radius:6px}
.nav-logo span{color:#fff;font-size:1.25rem;font-weight:700;letter-spacing:1px}
.nav-menu{display:flex;gap:6px;align-items:center;flex-wrap:wrap}
.nav-menu a{color:#E0D4F5;font-size:.9rem;padding:6px 14px;border-radius:20px;transition:all .3s;white-space:nowrap}
.nav-menu a:hover,.nav-menu a.active{background:#FF6B9D;color:#fff}
.nav-toggle{display:none;background:none;border:none;color:#fff;font-size:1.5rem;cursor:pointer}

/* === 搜索栏 === */
.search-bar{background:linear-gradient(90deg,#2D1B4E,#1A1A2E);padding:14px 0;border-bottom:2px solid #FF6B9D33}
.search-bar .container{display:flex;justify-content:center}
.search-box{display:flex;width:100%;max-width:600px;border-radius:25px;overflow:hidden;box-shadow:0 4px 15px rgba(255,107,157,.2)}
.search-box input{flex:1;padding:10px 20px;border:2px solid #6B2FA0;border-right:none;border-radius:25px 0 0 25px;font-size:.95rem;outline:none;background:#fff;color:#1A1A2E}
.search-box input:focus{border-color:#FF6B9D}
.search-box button{padding:10px 28px;background:linear-gradient(135deg,#FF6B9D,#6B2FA0);color:#fff;border:none;cursor:pointer;font-size:.95rem;font-weight:600;border-radius:0 25px 25px 0;transition:opacity .3s}
.search-box button:hover{opacity:.85}

/* === Hero Banner === */
.hero-section{position:relative;overflow:hidden;background:#1A1A2E}
.hero-section img{width:100%;height:auto;min-height:300px;object-fit:cover}
.hero-overlay{position:absolute;top:0;left:0;right:0;bottom:0;background:linear-gradient(90deg,rgba(26,26,46,.85) 0%,rgba(26,26,46,.3) 60%,transparent 100%);display:flex;align-items:center;padding:0 5%}
.hero-text{max-width:550px}
.hero-text h1{font-size:2.5rem;color:#fff;margin-bottom:12px;text-shadow:0 2px 10px rgba(0,0,0,.5)}
.hero-text h1 em{font-style:normal;color:#FF6B9D}
.hero-text p{color:#E0D4F5;font-size:1.05rem;margin-bottom:20px;line-height:1.8}
.hero-text .btn-group{display:flex;gap:12px;flex-wrap:wrap}

/* === 按钮 === */
.btn{display:inline-block;padding:10px 26px;border-radius:25px;font-size:.95rem;font-weight:600;cursor:pointer;transition:all .3s;border:none;text-align:center}
.btn-primary{background:linear-gradient(135deg,#FF6B9D,#E0457B);color:#fff;box-shadow:0 4px 15px rgba(255,107,157,.4)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(255,107,157,.5);color:#fff}
.btn-outline{background:transparent;color:#FF6B9D;border:2px solid #FF6B9D}
.btn-outline:hover{background:#FF6B9D;color:#fff}
.btn-gold{background:linear-gradient(135deg,#F5A623,#E09100);color:#fff;box-shadow:0 4px 15px rgba(245,166,35,.4)}
.btn-gold:hover{transform:translateY(-2px);color:#fff}
.btn-sm{padding:7px 18px;font-size:.85rem}

/* === 区块通用 === */
.section{padding:50px 0}
.section-alt{background:#F0EBF8}
.section-dark{background:linear-gradient(135deg,#1A1A2E,#2D1B4E);color:#fff}
.section-dark h2,.section-dark h3,.section-dark h4{color:#fff}
.section-title{text-align:center;margin-bottom:35px}
.section-title h2{font-size:1.85rem;position:relative;display:inline-block;padding-bottom:12px}
.section-title h2::after{content:'';position:absolute;bottom:0;left:50%;transform:translateX(-50%);width:60px;height:3px;background:linear-gradient(90deg,#FF6B9D,#6B2FA0);border-radius:2px}
.section-title p{color:#7A7A8E;margin-top:10px;font-size:.95rem}

/* === 视频卡片网格 === */
.video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.video-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 20px rgba(0,0,0,.08);transition:all .35s;cursor:pointer;position:relative}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 35px rgba(107,47,160,.2)}
.video-card .thumb{position:relative;padding-top:56.25%;overflow:hidden;background:#1A1A2E}
.video-card .thumb img{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover;transition:transform .4s}
.video-card:hover .thumb img{transform:scale(1.08)}
.video-card .play-icon{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:50px;height:50px;background:rgba(255,107,157,.85);border-radius:50%;display:flex;align-items:center;justify-content:center;transition:all .3s}
.video-card .play-icon::after{content:'';border-left:18px solid #fff;border-top:11px solid transparent;border-bottom:11px solid transparent;margin-left:4px}
.video-card:hover .play-icon{background:#FF6B9D;transform:translate(-50%,-50%) scale(1.15)}
.video-card .card-body{padding:14px 16px}
.video-card .card-body h3{font-size:.95rem;margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-card .card-body .meta{display:flex;justify-content:space-between;color:#999;font-size:.8rem}
.video-card .card-body .meta span{display:flex;align-items:center;gap:3px}
.video-card .tag{position:absolute;top:10px;left:10px;background:linear-gradient(135deg,#FF6B9D,#6B2FA0);color:#fff;padding:3px 10px;border-radius:12px;font-size:.75rem;font-weight:600}
.video-card .duration{position:absolute;bottom:10px;right:10px;background:rgba(0,0,0,.7);color:#fff;padding:2px 8px;border-radius:4px;font-size:.75rem}

/* === 特色模块 === */
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:25px}
.feature-card{background:#fff;border-radius:14px;padding:30px 24px;text-align:center;box-shadow:0 4px 20px rgba(0,0,0,.06);transition:all .35s;border:1px solid #F0EBF8}
.feature-card:hover{transform:translateY(-5px);border-color:#FF6B9D;box-shadow:0 10px 30px rgba(255,107,157,.15)}
.feature-card .icon{width:65px;height:65px;margin:0 auto 18px;background:linear-gradient(135deg,#FF6B9D22,#6B2FA022);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.8rem}
.feature-card h3{font-size:1.1rem;margin-bottom:10px}
.feature-card p{color:#7A7A8E;font-size:.9rem;line-height:1.6}

/* === 专家展示 === */
.expert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.expert-card{background:#fff;border-radius:14px;overflow:hidden;box-shadow:0 4px 20px rgba(0,0,0,.08);transition:all .35s;text-align:center}
.expert-card:hover{transform:translateY(-5px);box-shadow:0 10px 30px rgba(107,47,160,.15)}
.expert-card .avatar{width:100%;height:200px;overflow:hidden}
.expert-card .avatar img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.expert-card:hover .avatar img{transform:scale(1.06)}
.expert-card .info{padding:18px 16px}
.expert-card .info h4{font-size:1.05rem;margin-bottom:4px}
.expert-card .info .role{color:#FF6B9D;font-size:.85rem;font-weight:600;margin-bottom:8px}
.expert-card .info p{color:#7A7A8E;font-size:.85rem;line-height:1.5;margin-bottom:12px}
.expert-card .info .btn{font-size:.8rem;padding:6px 16px}

/* === 合作品牌 === */
.brand-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:30px;align-items:center;padding:20px 0}
.brand-wall .brand-item{width:120px;height:60px;background:#fff;border-radius:10px;display:flex;align-items:center;justify-content:center;box-shadow:0 2px 10px rgba(0,0,0,.06);padding:10px;filter:grayscale(.5);transition:all .3s}
.brand-wall .brand-item:hover{filter:grayscale(0);box-shadow:0 4px 15px rgba(107,47,160,.15)}

/* === FAQ === */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#fff;border-radius:12px;margin-bottom:12px;box-shadow:0 2px 10px rgba(0,0,0,.05);overflow:hidden;border:1px solid #F0EBF8}
.faq-item .faq-q{padding:16px 20px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;font-size:.95rem;transition:background .3s}
.faq-item .faq-q:hover{background:#F0EBF8}
.faq-item .faq-q .arrow{transition:transform .3s;font-size:1.2rem;color:#6B2FA0}
.faq-item.active .faq-q .arrow{transform:rotate(180deg)}
.faq-item .faq-a{padding:0 20px;max-height:0;overflow:hidden;transition:all .4s ease;color:#7A7A8E;font-size:.9rem;line-height:1.7}
.faq-item.active .faq-a{padding:0 20px 16px;max-height:500px}

/* === 用户评论 === */
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.review-card{background:#fff;border-radius:14px;padding:24px;box-shadow:0 4px 20px rgba(0,0,0,.06);border:1px solid #F0EBF8;transition:all .3s}
.review-card:hover{border-color:#FF6B9D;box-shadow:0 8px 25px rgba(255,107,157,.12)}
.review-card .stars{color:#F5A623;font-size:1rem;margin-bottom:10px;letter-spacing:2px}
.review-card .review-text{color:#555;font-size:.9rem;line-height:1.7;margin-bottom:14px;font-style:italic}
.review-card .reviewer{display:flex;align-items:center;gap:10px}
.review-card .reviewer .avatar-sm{width:38px;height:38px;border-radius:50%;background:linear-gradient(135deg,#FF6B9D,#6B2FA0);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:.9rem}
.review-card .reviewer .name{font-weight:600;font-size:.85rem}
.review-card .reviewer .date{color:#999;font-size:.78rem}

/* === 联系我们 === */
.contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:30px;align-items:start}
.contact-info{background:#fff;border-radius:14px;padding:30px;box-shadow:0 4px 20px rgba(0,0,0,.06)}
.contact-info h3{font-size:1.2rem;margin-bottom:18px;color:#1A1A2E}
.contact-info .info-item{display:flex;gap:12px;margin-bottom:16px;align-items:flex-start}
.contact-info .info-item .label{min-width:80px;color:#6B2FA0;font-weight:600;font-size:.9rem}
.contact-info .info-item .value{color:#555;font-size:.9rem}
.qr-group{display:flex;gap:20px;justify-content:center;flex-wrap:wrap}
.qr-item{text-align:center}
.qr-item img{width:160px;height:160px;border-radius:10px;box-shadow:0 4px 15px rgba(0,0,0,.1)}
.qr-item p{margin-top:8px;font-size:.85rem;color:#7A7A8E}

/* === 社交分享 === */
.share-bar{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;padding:20px 0}
.share-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 18px;border-radius:20px;font-size:.85rem;font-weight:600;color:#fff;transition:all .3s}
.share-btn:hover{transform:translateY(-2px);color:#fff}
.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:linear-gradient(135deg,#1A1A2E,#2D1B4E);color:#C0B3D4;padding:40px 0 0}
.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:30px;padding-bottom:30px;border-bottom:1px solid rgba(255,255,255,.1)}
.footer-col h4{color:#fff;font-size:1rem;margin-bottom:16px;position:relative;padding-bottom:8px}
.footer-col h4::after{content:'';position:absolute;bottom:0;left:0;width:30px;height:2px;background:#FF6B9D}
.footer-col a{display:block;color:#C0B3D4;font-size:.85rem;margin-bottom:8px;transition:color .3s}
.footer-col a:hover{color:#FF6B9D}
.footer-col p{font-size:.85rem;line-height:1.7;margin-bottom:8px}
.footer-bottom{text-align:center;padding:20px 0;font-size:.82rem;color:#8A7FA0}
.footer-bottom a{color:#FF6B9D}

/* === 面包屑 === */
.breadcrumb{padding:12px 0;font-size:.85rem;color:#7A7A8E}
.breadcrumb a{color:#6B2FA0}
.breadcrumb a:hover{color:#FF6B9D}
.breadcrumb span{margin:0 6px;color:#ccc}

/* === 视频播放页 === */
.video-player-wrap{background:#000;border-radius:12px;overflow:hidden;margin-bottom:25px;position:relative;padding-top:56.25%}
.video-player-wrap video,.video-player-wrap iframe{position:absolute;top:0;left:0;width:100%;height:100%}
.video-detail{background:#fff;border-radius:14px;padding:28px;box-shadow:0 4px 20px rgba(0,0,0,.06);margin-bottom:25px}
.video-detail h1{font-size:1.5rem;margin-bottom:12px}
.video-detail .video-meta{display:flex;gap:20px;color:#999;font-size:.85rem;margin-bottom:16px;flex-wrap:wrap}
.video-detail .video-meta span{display:flex;align-items:center;gap:4px}
.video-detail .video-desc{color:#555;font-size:.92rem;line-height:1.8}
.video-tags{display:flex;gap:8px;flex-wrap:wrap;margin-top:15px}
.video-tags a{background:#F0EBF8;color:#6B2FA0;padding:4px 14px;border-radius:15px;font-size:.82rem;transition:all .3s}
.video-tags a:hover{background:#6B2FA0;color:#fff}

/* === Logo图标切换 === */
.nav-logo .logo-icon{display:none}
.footer-logo{display:block;margin:0 auto 12px}
.footer-top{text-align:center;margin-bottom:25px;padding-bottom:20px;border-bottom:1px solid rgba(255,255,255,.1)}
.footer-slogan{color:#C0B3D4;font-size:.9rem;margin-top:8px}

/* === 作者信息 === */
.author-info{margin-bottom:16px;padding:12px 16px;background:#F0EBF8;border-radius:10px;border-left:3px solid #6B2FA0}
.author-badge{display:flex;align-items:center;gap:15px;flex-wrap:wrap}
.author-name{font-weight:700;color:#1A1A2E;font-size:.95rem}
.author-role{color:#6B2FA0;font-size:.85rem}

/* === 评论区 === */
.comment-section{background:#fff;border-radius:14px;padding:28px;box-shadow:0 4px 20px rgba(0,0,0,.06);margin-top:25px}
.comment-section h3{font-size:1.15rem;margin-bottom:18px;padding-bottom:10px;border-bottom:2px solid #F0EBF8}
.comment-form textarea{width:100%;padding:12px 16px;border:2px solid #F0EBF8;border-radius:10px;font-size:.9rem;resize:vertical;outline:none;font-family:inherit;transition:border-color .3s}
.comment-form textarea:focus{border-color:#6B2FA0}
.comment-list{margin-top:20px}
.comment-item{display:flex;gap:12px;padding:16px 0;border-bottom:1px solid #F0EBF8}
.comment-item:last-child{border-bottom:none}
.comment-avatar{width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,#FF6B9D,#6B2FA0);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:.9rem;flex-shrink:0}
.comment-body{flex:1}
.comment-header{display:flex;justify-content:space-between;margin-bottom:6px}
.comment-name{font-weight:600;font-size:.88rem;color:#1A1A2E}
.comment-time{color:#999;font-size:.8rem}
.comment-body p{color:#555;font-size:.88rem;line-height:1.7}
.comment-actions{display:flex;gap:15px;margin-top:6px;color:#999;font-size:.8rem;cursor:pointer}
.comment-actions span:hover{color:#FF6B9D}

/* === 时间线 === */
.timeline{margin:20px 0 30px;padding-left:25px;border-left:3px solid #6B2FA0}
.timeline-item{position:relative;padding:12px 0 12px 20px;margin-bottom:5px}
.timeline-item::before{content:'';position:absolute;left:-32px;top:16px;width:12px;height:12px;border-radius:50%;background:#FF6B9D;border:3px solid #6B2FA0}
.timeline-item .year{font-weight:700;color:#6B2FA0;font-size:.95rem;display:block;margin-bottom:4px}
.timeline-item p{color:#555;font-size:.88rem;line-height:1.6}

/* === About页面 === */
.about-content{background:#fff;border-radius:14px;padding:35px;box-shadow:0 4px 20px rgba(0,0,0,.06)}
.about-content h2{font-size:1.3rem;margin:25px 0 12px;color:#1A1A2E;padding-bottom:8px;border-bottom:2px solid #F0EBF8}
.about-content h2:first-child{margin-top:0}
.about-content h3{font-size:1.1rem;margin:20px 0 10px;color:#6B2FA0}
.about-content h4{font-size:1rem;margin:18px 0 8px}
.about-content h5{font-size:.95rem;margin:16px 0 8px;color:#6B2FA0}
.about-content h6{font-size:.9rem;margin:14px 0 6px}
.about-content p{color:#555;font-size:.92rem;line-height:1.8;margin-bottom:12px}

/* === 侧边栏 === */
.page-layout{display:grid;grid-template-columns:1fr 320px;gap:30px;align-items:start}
.sidebar .widget{background:#fff;border-radius:14px;padding:20px;box-shadow:0 4px 20px rgba(0,0,0,.06);margin-bottom:20px}
.sidebar .widget h4{font-size:1rem;margin-bottom:14px;padding-bottom:8px;border-bottom:2px solid #F0EBF8}
.sidebar .widget-video{display:flex;gap:10px;margin-bottom:12px;cursor:pointer;transition:opacity .3s}
.sidebar .widget-video:hover{opacity:.8}
.sidebar .widget-video .mini-thumb{width:110px;height:65px;border-radius:6px;overflow:hidden;flex-shrink:0;position:relative}
.sidebar .widget-video .mini-thumb img{width:100%;height:100%;object-fit:cover}
.sidebar .widget-video .mini-info h5{font-size:.82rem;line-height:1.4;margin-bottom:4px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.sidebar .widget-video .mini-info .mini-meta{color:#999;font-size:.75rem}

/* === 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:14px;padding:28px 20px;text-align:center;box-shadow:0 4px 20px rgba(0,0,0,.06);position:relative;border-top:3px solid #6B2FA0;counter-increment:step}
.howto-step::before{content:counter(step);position:absolute;top:-18px;left:50%;transform:translateX(-50%);width:36px;height:36px;background:linear-gradient(135deg,#FF6B9D,#6B2FA0);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1rem}
.howto-step h4{margin-top:10px;margin-bottom:8px;font-size:.95rem}
.howto-step p{color:#7A7A8E;font-size:.85rem;line-height:1.6}

/* === 数据统计 === */
.stats-bar{display:flex;justify-content:center;gap:50px;flex-wrap:wrap;padding:30px 0}
.stat-item{text-align:center}
.stat-item .num{font-size:2.2rem;font-weight:800;background:linear-gradient(135deg,#FF6B9D,#F5A623);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.stat-item .label{color:#C0B3D4;font-size:.85rem;margin-top:4px}

/* === 懒加载占位 === */
img[loading="lazy"]{background:#F0EBF8;min-height:100px}

/* === 响应式 === */
@media(max-width:1024px){
  .video-grid{grid-template-columns:repeat(3,1fr)}
  .expert-grid{grid-template-columns:repeat(2,1fr)}
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
  .page-layout{grid-template-columns:1fr}
  .howto-steps{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .nav-logo .logo-full{display:none}
  .nav-logo .logo-icon{display:block}
  .nav-menu{display:none;position:absolute;top:100%;left:0;right:0;background:#1A1A2E;flex-direction:column;padding:15px;gap:5px;box-shadow:0 10px 30px rgba(0,0,0,.3)}
  .nav-menu.active{display:flex}
  .nav-toggle{display:block}
  .video-grid{grid-template-columns:repeat(2,1fr)}
  .review-grid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .hero-text h1{font-size:1.6rem}
  .hero-text p{font-size:.9rem}
  .stats-bar{gap:25px}
  .stat-item .num{font-size:1.6rem}
  .section{padding:35px 0}
  .section-title h2{font-size:1.4rem}
}
@media(max-width:480px){
  .video-grid{grid-template-columns:1fr}
  .feature-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:1fr}
  .howto-steps{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .hero-overlay{padding:0 15px}
}