/* ===== 天天吃瓜 - 全站样式表 ===== */
/* 基础重置 */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:#333;line-height:1.7;background:#f8f9fa}
a{color:#e74c3c;text-decoration:none;transition:color .3s}
a:hover{color:#c0392b}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* ===== 头部导航 ===== */
.site-header{background:#fff;box-shadow:0 2px 12px rgba(0,0,0,.08);position:sticky;top:0;z-index:1000}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:12px 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{font-size:1.3rem;font-weight:700;color:#e74c3c}
.main-nav{display:flex;align-items:center;gap:6px}
.main-nav a{padding:8px 16px;border-radius:6px;font-size:.95rem;color:#555;font-weight:500;transition:all .3s}
.main-nav a:hover,.main-nav a.active{background:#e74c3c;color:#fff}
.mobile-menu-btn{display:none;background:none;border:none;font-size:1.5rem;cursor:pointer;color:#333}

/* ===== 搜索栏 ===== */
.search-bar{background:linear-gradient(135deg,#667eea 0%,#e74c3c 100%);padding:18px 0}
.search-bar .container{display:flex;justify-content:center}
.search-form{display:flex;max-width:600px;width:100%;background:#fff;border-radius:50px;overflow:hidden;box-shadow:0 4px 15px rgba(0,0,0,.15)}
.search-form input{flex:1;border:none;padding:12px 24px;font-size:1rem;outline:none;background:transparent}
.search-form button{background:#e74c3c;color:#fff;border:none;padding:12px 28px;cursor:pointer;font-size:1rem;transition:background .3s}
.search-form button:hover{background:#c0392b}

/* ===== 面包屑 ===== */
.breadcrumb{padding:12px 0;font-size:.85rem;color:#888}
.breadcrumb a{color:#e74c3c}
.breadcrumb span{margin:0 6px;color:#ccc}

/* ===== Hero Banner ===== */
.hero-section{position:relative;overflow:hidden;border-radius:0 0 20px 20px}
.hero-section img{width:100%;height:420px;object-fit:cover}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(to right,rgba(0,0,0,.65) 0%,rgba(0,0,0,.1) 100%);display:flex;align-items:center;padding:0 60px}
.hero-text{max-width:550px;color:#fff}
.hero-text h1{font-size:2.2rem;margin-bottom:12px;line-height:1.3}
.hero-text p{font-size:1.05rem;margin-bottom:24px;opacity:.9}
.hero-text .btn-primary{display:inline-block;background:#e74c3c;color:#fff;padding:12px 32px;border-radius:50px;font-size:1rem;font-weight:600;transition:all .3s;box-shadow:0 4px 15px rgba(231,76,60,.4)}
.hero-text .btn-primary:hover{background:#c0392b;transform:translateY(-2px)}

/* ===== 通用模块标题 ===== */
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:1.8rem;color:#222;margin-bottom:8px;position:relative;display:inline-block}
.section-title h2::after{content:'';display:block;width:60px;height:3px;background:#e74c3c;margin:10px auto 0;border-radius:3px}
.section-title p{color:#777;font-size:.95rem;margin-top:8px}

/* ===== 视频卡片网格 ===== */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px;padding:50px 0}
.video-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 20px rgba(0,0,0,.06);transition:all .3s}
.video-card:hover{transform:translateY(-6px);box-shadow:0 8px 30px rgba(0,0,0,.12)}
.video-thumb{position:relative;overflow:hidden;aspect-ratio:16/9}
.video-thumb img{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;background:rgba(0,0,0,.35);opacity:0;transition:opacity .3s}
.video-card:hover .play-btn{opacity:1}
.play-btn svg{width:56px;height:56px;fill:#fff;filter:drop-shadow(0 2px 8px rgba(0,0,0,.3))}
.video-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.75);color:#fff;padding:2px 8px;border-radius:4px;font-size:.75rem}
.video-info{padding:14px 16px}
.video-info h3{font-size:1rem;margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;line-height:1.4}
.video-meta{display:flex;align-items:center;gap:12px;font-size:.8rem;color:#999}
.video-meta span{display:flex;align-items:center;gap:3px}
.video-tags{display:flex;gap:6px;margin-top:8px;flex-wrap:wrap}
.video-tags span{background:#fef0ef;color:#e74c3c;padding:2px 10px;border-radius:20px;font-size:.75rem}

/* ===== 分类标签导航 ===== */
.category-tabs{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-bottom:30px}
.category-tabs .tab{padding:8px 22px;border-radius:50px;background:#f0f0f0;color:#555;cursor:pointer;transition:all .3s;font-size:.9rem}
.category-tabs .tab:hover,.category-tabs .tab.active{background:#e74c3c;color:#fff}

/* ===== 专家展示 ===== */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}
.expert-card{background:#fff;border-radius:12px;padding:30px 20px;text-align:center;box-shadow:0 4px 20px rgba(0,0,0,.06);transition:all .3s}
.expert-card:hover{transform:translateY(-4px);box-shadow:0 8px 30px rgba(0,0,0,.12)}
.expert-card img{width:100px;height:100px;border-radius:50%;object-fit:cover;margin:0 auto 16px;border:3px solid #fef0ef}
.expert-card h4{font-size:1.1rem;margin-bottom:4px}
.expert-card .title{color:#e74c3c;font-size:.85rem;margin-bottom:10px}
.expert-card p{font-size:.85rem;color:#777;margin-bottom:16px;line-height:1.6}
.expert-card .btn-group{display:flex;gap:8px;justify-content:center}
.expert-card .btn-sm{padding:6px 18px;border-radius:50px;font-size:.8rem;border:1px solid #e74c3c;color:#e74c3c;transition:all .3s}
.expert-card .btn-sm:hover{background:#e74c3c;color:#fff}

/* ===== FAQ ===== */
.faq-section{padding:50px 0;background:#fff}
.faq-item{border-bottom:1px solid #eee;padding:18px 0}
.faq-question{display:flex;justify-content:space-between;align-items:center;cursor:pointer;font-weight:600;font-size:1rem;color:#333;transition:color .3s}
.faq-question:hover{color:#e74c3c}
.faq-question .arrow{transition:transform .3s;font-size:1.2rem;color:#ccc}
.faq-item.open .faq-question .arrow{transform:rotate(180deg);color:#e74c3c}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .4s ease;color:#666;font-size:.9rem;line-height:1.8}
.faq-item.open .faq-answer{max-height:500px;padding-top:12px}

/* ===== 用户评论 ===== */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.review-card{background:#fff;border-radius:12px;padding:24px;box-shadow:0 4px 20px rgba(0,0,0,.06)}
.review-header{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.review-avatar{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,#e74c3c,#f39c12);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:1.1rem}
.review-name{font-weight:600;font-size:.95rem}
.review-date{font-size:.75rem;color:#999}
.review-stars{color:#f39c12;margin-bottom:8px;font-size:.9rem}
.review-text{font-size:.9rem;color:#555;line-height:1.7}

/* ===== 合作品牌 ===== */
.partner-wall{display:flex;flex-wrap:wrap;gap:24px;justify-content:center;align-items:center;padding:30px 0}
.partner-wall .partner-item{background:#fff;padding:16px 30px;border-radius:10px;box-shadow:0 2px 10px rgba(0,0,0,.06);font-size:1rem;font-weight:600;color:#555;transition:all .3s}
.partner-wall .partner-item:hover{box-shadow:0 4px 20px rgba(0,0,0,.12);transform:translateY(-2px)}

/* ===== 联系我们 ===== */
.contact-section{padding:50px 0}
.contact-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:24px}
.contact-card{background:#fff;border-radius:12px;padding:24px;text-align:center;box-shadow:0 4px 20px rgba(0,0,0,.06)}
.contact-card .icon{font-size:2rem;margin-bottom:12px}
.contact-card h4{margin-bottom:8px;font-size:1rem}
.contact-card p{font-size:.85rem;color:#666}

/* ===== 社交分享 ===== */
.share-bar{display:flex;gap:12px;justify-content:center;padding:20px 0;flex-wrap:wrap}
.share-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 20px;border-radius:50px;color:#fff;font-size:.85rem;transition:all .3s}
.share-btn:hover{transform:translateY(-2px);opacity:.9;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:#1a1a2e;color:#ccc;padding:50px 0 0}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:30px;margin-bottom:40px}
.footer-col h4{color:#fff;font-size:1.05rem;margin-bottom:16px;position:relative;padding-bottom:10px}
.footer-col h4::after{content:'';position:absolute;bottom:0;left:0;width:30px;height:2px;background:#e74c3c}
.footer-col p,.footer-col a{font-size:.85rem;color:#aaa;line-height:2}
.footer-col a:hover{color:#e74c3c}
.footer-col img{max-width:120px;border-radius:8px;margin-top:8px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:20px 0;text-align:center;font-size:.8rem;color:#777}
.footer-bottom a{color:#e74c3c}

/* ===== How-To 指南 ===== */
.howto-steps{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:24px;counter-reset:step}
.howto-step{background:#fff;border-radius:12px;padding:30px 20px;text-align:center;box-shadow:0 4px 20px rgba(0,0,0,.06);position:relative;counter-increment:step}
.howto-step::before{content:counter(step);position:absolute;top:-14px;left:50%;transform:translateX(-50%);background:#e74c3c;color:#fff;width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.9rem}
.howto-step h4{margin:10px 0 8px;font-size:1rem}
.howto-step p{font-size:.85rem;color:#666}

/* ===== 内页通用 ===== */
.page-section{padding:50px 0}
.page-section:nth-child(even){background:#fff}
.content-block{background:#fff;border-radius:12px;padding:30px;margin-bottom:24px;box-shadow:0 4px 20px rgba(0,0,0,.06)}
.content-block h3{font-size:1.2rem;margin-bottom:12px;color:#222}
.content-block p{font-size:.9rem;color:#555;line-height:1.8}

/* ===== 功能卡片 ===== */
.feature-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}
.feature-card{background:#fff;border-radius:12px;padding:30px;text-align:center;box-shadow:0 4px 20px rgba(0,0,0,.06);transition:all .3s}
.feature-card:hover{transform:translateY(-4px);box-shadow:0 8px 30px rgba(0,0,0,.12)}
.feature-card .icon{font-size:2.5rem;margin-bottom:16px}
.feature-card h4{font-size:1.05rem;margin-bottom:8px}
.feature-card p{font-size:.85rem;color:#666}

/* ===== 响应式 ===== */
@media(max-width:768px){
  .header-inner{flex-wrap:wrap}
  .main-nav{display:none;width:100%;flex-direction:column;padding-top:10px}
  .main-nav.show{display:flex}
  .mobile-menu-btn{display:block}
  .hero-section img{height:260px}
  .hero-overlay{padding:0 20px}
  .hero-text h1{font-size:1.5rem}
  .hero-text p{font-size:.9rem}
  .video-grid{grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:12px}
  .video-info h3{font-size:.85rem}
  .section-title h2{font-size:1.4rem}
  .footer-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:1fr}
  .search-form{border-radius:30px}
  .search-form input{padding:10px 16px;font-size:.9rem}
  .search-form button{padding:10px 20px;font-size:.9rem}
}
@media(max-width:480px){
  .video-grid{grid-template-columns:1fr}
  .review-grid{grid-template-columns:1fr}
  .hero-section img{height:200px}
}