/* =============================================
   51吃瓜 - 原创CSS样式表
   品牌：51吃瓜 | 域名：egikm.cn
   配色：深海蓝 #0a1628 + 珊瑚橙 #e8603c + 金色 #f0c040
   ============================================= */

/* === 全局重置与基础 === */
*,*::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;color:#2d3748;background:#f7f8fc;line-height:1.7}
a{color:#e8603c;text-decoration:none;transition:color .3s}
a:hover{color:#f0c040}
img{max-width:100%;height:auto;display:block}
ul{list-style:none}

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

/* === 顶部导航 === */
.site-header{background:linear-gradient(135deg,#0a1628 0%,#162544 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;max-width:1200px;margin:0 auto;padding:12px 20px}
.logo-area a{display:flex;align-items:center;gap:10px;text-decoration:none}
.logo-area img{width:50px;height:50px;border-radius:10px}
.brand-name{font-size:1.5rem;font-weight:800;color:#f0c040;letter-spacing:1px}
.main-nav ul{display:flex;gap:6px}
.main-nav a{color:#c8d6e5;padding:8px 14px;border-radius:6px;font-size:.9rem;font-weight:500;transition:all .3s}
.main-nav a:hover,.main-nav .nav-active{color:#fff;background:rgba(232,96,60,.8)}
.mobile-menu-btn{display:none;background:none;border:none;color:#f0c040;font-size:1.6rem;cursor:pointer}
.search-bar{background:rgba(10,22,40,.6);padding:10px 0}
.search-inner{max-width:600px;margin:0 auto;display:flex;gap:8px;padding:0 20px}
.search-inner input{flex:1;padding:10px 16px;border:2px solid #2d4a7a;border-radius:8px;background:#0d1f3c;color:#e2e8f0;font-size:.9rem;outline:none;transition:border-color .3s}
.search-inner input:focus{border-color:#e8603c}
.search-inner input::placeholder{color:#6b7c93}
#searchBtn{padding:10px 24px;background:linear-gradient(135deg,#e8603c,#f0c040);color:#fff;border:none;border-radius:8px;font-weight:600;cursor:pointer;transition:transform .2s}
#searchBtn:hover{transform:scale(1.05)}

/* === Hero Banner === */
.hero-banner{position:relative;height:520px;overflow:hidden;display:flex;align-items:center;justify-content:center}
.hero-banner img{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover}
.hero-overlay{position:absolute;top:0;left:0;width:100%;height:100%;background:linear-gradient(135deg,rgba(10,22,40,.85),rgba(22,37,68,.7));z-index:1}
.hero-content{position:relative;z-index:2;text-align:center;padding:0 20px;max-width:800px}
.hero-content h1{font-size:2.4rem;color:#fff;margin-bottom:16px;text-shadow:0 2px 10px rgba(0,0,0,.5);line-height:1.3}
.hero-content h2{font-size:1.15rem;color:#f0c040;margin-bottom:12px;font-weight:500}
.hero-content p{color:#c8d6e5;font-size:1rem;margin-bottom:28px;line-height:1.6}
.hero-btns{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.btn-primary{display:inline-block;padding:14px 36px;background:linear-gradient(135deg,#e8603c,#d4472a);color:#fff;border-radius:10px;font-weight:700;font-size:1rem;transition:all .3s;box-shadow:0 4px 15px rgba(232,96,60,.4)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(232,96,60,.6);color:#fff}
.btn-secondary{display:inline-block;padding:14px 36px;border:2px solid #f0c040;color:#f0c040;border-radius:10px;font-weight:700;font-size:1rem;transition:all .3s}
.btn-secondary:hover{background:#f0c040;color:#0a1628}

/* === 通用Section === */
.section{padding:60px 0}
.section-alt{background:#eef1f8}
.section-dark{background:linear-gradient(135deg,#0a1628,#162544);color:#e2e8f0}
.section-dark .section-header h2{color:#f0c040}
.section-dark .section-header p{color:#a0aec0}
.section-header{text-align:center;margin-bottom:40px}
.section-header h2{font-size:1.8rem;color:#0a1628;margin-bottom:10px;position:relative;display:inline-block}
.section-header h2::after{content:'';display:block;width:60px;height:4px;background:linear-gradient(90deg,#e8603c,#f0c040);margin:10px auto 0;border-radius:2px}
.section-header p{color:#5a6a7e;font-size:1rem;max-width:700px;margin:0 auto}

/* === 视频卡片网格 === */
.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.video-card{background:#fff;border-radius:14px;overflow:hidden;box-shadow:0 4px 20px rgba(0,0,0,.08);transition:all .3s}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 35px rgba(0,0,0,.15)}
.video-thumb{position:relative;overflow:hidden;aspect-ratio:16/9}
.video-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.video-card:hover .video-thumb img{transform:scale(1.08)}
.play-overlay{position:absolute;top:0;left:0;width:100%;height:100%;background:rgba(10,22,40,.4);display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s}
.video-card:hover .play-overlay{opacity:1}
.play-btn{width:60px;height:60px;background:rgba(232,96,60,.9);border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-size:1.5rem;box-shadow:0 4px 15px rgba(232,96,60,.5);cursor:pointer;transition:transform .2s;line-height:60px;text-align:center}
.play-btn:hover{transform:scale(1.1)}
.video-duration{position:absolute;bottom:10px;right:10px;background:rgba(10,22,40,.8);color:#fff;padding:3px 8px;border-radius:4px;font-size:.75rem;font-weight:600}
.video-tag{position:absolute;top:10px;left:10px;background:linear-gradient(135deg,#e8603c,#f0c040);color:#fff;padding:4px 10px;border-radius:6px;font-size:.72rem;font-weight:600}
.video-info{padding:16px}
.video-info h3{font-size:1.05rem;color:#1a202c;margin-bottom:6px;line-height:1.4}
.video-meta{font-size:.8rem;color:#8896a6;margin-bottom:6px}
.video-desc{font-size:.85rem;color:#5a6a7e;line-height:1.5}

/* === Feature Grid === */
.feature-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.feature-card{background:#fff;border-radius:14px;overflow:hidden;box-shadow:0 4px 20px rgba(0,0,0,.08);transition:all .3s}
.feature-card:hover{transform:translateY(-4px);box-shadow:0 10px 30px rgba(0,0,0,.12)}
.feature-card img{width:100%;height:200px;object-fit:cover}
.feature-card h3{padding:16px 16px 0;font-size:1.1rem;color:#0a1628}
.feature-card p{padding:8px 16px 16px;font-size:.9rem;color:#5a6a7e;line-height:1.6}

/* === 娱乐专区 === */
.ent-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.ent-card{background:#fff;border-radius:14px;overflow:hidden;box-shadow:0 4px 20px rgba(0,0,0,.08);position:relative;transition:all .3s}
.ent-card:hover{transform:translateY(-4px)}
.ent-card img{width:100%;height:160px;object-fit:cover}
.ent-badge{position:absolute;top:10px;right:10px;background:#e8603c;color:#fff;padding:3px 10px;border-radius:6px;font-size:.72rem;font-weight:600}
.ent-card h3{padding:12px 14px 0;font-size:.95rem;color:#0a1628}
.ent-card p{padding:6px 14px 14px;font-size:.82rem;color:#5a6a7e;line-height:1.5}

/* === AI赋能 === */
.ai-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.ai-card{background:rgba(255,255,255,.08);border:1px solid rgba(240,192,64,.2);border-radius:14px;overflow:hidden;transition:all .3s}
.ai-card:hover{border-color:#f0c040;transform:translateY(-4px)}
.ai-card img{width:100%;height:180px;object-fit:cover}
.ai-card h3{padding:16px 16px 0;font-size:1.05rem;color:#f0c040}
.ai-card p{padding:8px 16px 16px;font-size:.88rem;color:#a0aec0;line-height:1.6}

/* === 社区功能 === */
.community-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.comm-card{background:#fff;border-radius:14px;padding:30px 24px;text-align:center;box-shadow:0 4px 20px rgba(0,0,0,.08);transition:all .3s;border-top:4px solid transparent}
.comm-card:hover{transform:translateY(-4px);border-top-color:#e8603c}
.comm-icon{font-size:2.5rem;margin-bottom:14px}
.comm-card h3{font-size:1.05rem;color:#0a1628;margin-bottom:8px}
.comm-card p{font-size:.88rem;color:#5a6a7e;line-height:1.6}

/* === 专家展示 === */
.expert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.expert-card{background:#fff;border-radius:14px;padding:24px;text-align:center;box-shadow:0 4px 20px rgba(0,0,0,.08);transition:all .3s}
.expert-card:hover{transform:translateY(-4px)}
.expert-card img{width:120px;height:120px;border-radius:50%;object-fit:cover;margin:0 auto 14px;border:3px solid #f0c040}
.expert-card h3{font-size:1.05rem;color:#0a1628;margin-bottom:4px}
.expert-card h4{font-size:.85rem;color:#e8603c;margin-bottom:8px;font-weight:500}
.expert-card p{font-size:.82rem;color:#5a6a7e;line-height:1.5;margin-bottom:12px}
.expert-tags{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;margin-bottom:12px}
.expert-tags span{background:#eef1f8;color:#4a5568;padding:3px 10px;border-radius:20px;font-size:.72rem}
.expert-btns{display:flex;gap:8px;justify-content:center}
.btn-sm{padding:6px 16px;background:#e8603c;color:#fff;border-radius:6px;font-size:.78rem;font-weight:600;transition:all .2s}
.btn-sm:hover{background:#d4472a;color:#fff}
.btn-sm-outline{padding:6px 16px;border:1px solid #e8603c;color:#e8603c;border-radius:6px;font-size:.78rem;font-weight:600;transition:all .2s}
.btn-sm-outline:hover{background:#e8603c;color:#fff}

/* === 合作品牌 === */
.partner-wall{display:flex;flex-wrap:wrap;gap:16px;justify-content:center}
.partner-item{background:#fff;padding:16px 32px;border-radius:10px;font-size:.95rem;color:#4a5568;font-weight:600;box-shadow:0 2px 10px rgba(0,0,0,.06);transition:all .3s;border:2px solid transparent}
.partner-item:hover{border-color:#f0c040;color:#e8603c;transform:translateY(-2px)}

/* === How-To 步骤 === */
.howto-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.step-card{background:#fff;border-radius:14px;padding:30px 20px;text-align:center;box-shadow:0 4px 20px rgba(0,0,0,.08);position:relative;transition:all .3s}
.step-card:hover{transform:translateY(-4px)}
.step-num{font-size:2.5rem;font-weight:900;color:#e8603c;opacity:.3;margin-bottom:10px}
.step-card h3{font-size:1rem;color:#0a1628;margin-bottom:8px}
.step-card p{font-size:.85rem;color:#5a6a7e;line-height:1.5}

/* === FAQ === */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#fff;border-radius:10px;margin-bottom:12px;overflow:hidden;box-shadow:0 2px 10px rgba(0,0,0,.06)}
.faq-question{padding:18px 24px;font-weight:700;color:#0a1628;cursor:pointer;position:relative;font-size:1rem;transition:background .3s}
.faq-question:hover{background:#f7f8fc}
.faq-question::after{content:'+';position:absolute;right:24px;top:50%;transform:translateY(-50%);font-size:1.4rem;color:#e8603c;transition:transform .3s}
.faq-item.active .faq-question::after{transform:translateY(-50%) rotate(45deg)}
.faq-answer{padding:0 24px;max-height:0;overflow:hidden;transition:all .4s ease;color:#5a6a7e;font-size:.9rem;line-height:1.7}
.faq-item.active .faq-answer{padding:0 24px 18px;max-height:300px}

/* === 用户评论 === */
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.review-card{background:#fff;border-radius:14px;padding:24px;box-shadow:0 4px 20px rgba(0,0,0,.08);transition:all .3s;border-left:4px solid #f0c040}
.review-card:hover{transform:translateY(-3px)}
.review-stars{color:#f0c040;font-size:1.1rem;margin-bottom:10px}
.review-text{font-size:.9rem;color:#4a5568;line-height:1.6;margin-bottom:12px;font-style:italic}
.review-author{font-size:.82rem;color:#8896a6;font-weight:600}

/* === 社交分享 === */
.share-btns{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.share-btn{display:inline-block;padding:12px 28px;border-radius:10px;color:#fff;font-weight:600;font-size:.9rem;transition:all .3s}
.share-btn:hover{transform:translateY(-2px);color:#fff}
.share-wechat{background:#07c160}
.share-weibo{background:#e6162d}
.share-douyin{background:#161823}
.share-bilibili{background:#00a1d6}

/* === 联系我们 === */
.contact-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:24px}
.contact-card{background:rgba(255,255,255,.06);border:1px solid rgba(240,192,64,.15);border-radius:14px;padding:24px}
.section-dark .contact-card h3{color:#f0c040;margin-bottom:14px;font-size:1.1rem}
.section-dark .contact-card p{color:#a0aec0;font-size:.88rem;line-height:1.8}
.section-dark .contact-card strong{color:#e2e8f0}
.contact-qrcodes{display:flex;flex-direction:column;gap:16px;align-items:center;justify-content:center}
.qr-item{text-align:center}
.qr-item img{width:160px;height:160px;border-radius:10px;border:3px solid #f0c040}
.qr-item p{color:#a0aec0;font-size:.82rem;margin-top:6px}

/* 内页联系 */
.section .contact-grid{grid-template-columns:1fr 1fr}
.section .contact-card{background:#fff;border:1px solid #e2e8f0;border-radius:14px;padding:24px;box-shadow:0 4px 20px rgba(0,0,0,.08)}
.section .contact-card h3{color:#0a1628;margin-bottom:14px;font-size:1.1rem}
.section .contact-card p{color:#5a6a7e;font-size:.88rem;line-height:1.8}
.section .contact-card strong{color:#2d3748}
.section .contact-qrcodes{flex-direction:row;gap:24px}
.section .qr-item img{border-color:#e8603c}
.section .qr-item p{color:#5a6a7e}

/* === 页脚 === */
.site-footer{background:#060e1a;color:#8896a6;padding:50px 0 0}
.footer-inner{max-width:1200px;margin:0 auto;padding:0 20px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.5fr;gap:30px;padding-bottom:30px;border-bottom:1px solid rgba(255,255,255,.08)}
.footer-col h4{color:#f0c040;font-size:1rem;margin-bottom:14px}
.footer-col p{font-size:.82rem;line-height:1.7;margin-bottom:4px}
.footer-col a{display:block;color:#8896a6;font-size:.82rem;padding:3px 0;transition:color .3s}
.footer-col a:hover{color:#e8603c}
.footer-col img{width:80px;height:80px;border-radius:10px;margin-top:8px}
.footer-bottom{text-align:center;padding:20px 0;font-size:.78rem;color:#5a6a7e}
.footer-bottom p{margin:3px 0}

/* === 面包屑 === */
.breadcrumb{background:#eef1f8;padding:12px 0;font-size:.85rem}
.breadcrumb a{color:#e8603c}
.breadcrumb span{color:#5a6a7e}

/* === 内页Hero === */
.page-hero{background:linear-gradient(135deg,#0a1628,#162544);padding:50px 20px;text-align:center}
.page-hero h1{color:#fff;font-size:2rem;margin-bottom:10px}
.page-hero h2{color:#f0c040;font-size:1rem;font-weight:400}

/* === 时间线 === */
.timeline{position:relative;padding-left:40px;margin:30px 0}
.timeline::before{content:'';position:absolute;left:15px;top:0;bottom:0;width:3px;background:linear-gradient(180deg,#e8603c,#f0c040)}
.timeline-item{position:relative;margin-bottom:30px}
.timeline-year{position:absolute;left:-40px;top:0;width:30px;height:30px;background:#e8603c;color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.65rem;font-weight:700}
.timeline-content{background:#fff;border-radius:10px;padding:20px;box-shadow:0 2px 10px rgba(0,0,0,.06);margin-left:10px}
.timeline-content h4{color:#0a1628;margin-bottom:6px;font-size:1rem}
.timeline-content p{color:#5a6a7e;font-size:.88rem}

/* === MCP隐藏 === */
.mcp-widget{display:none!important}

/* === 响应式 === */
@media(max-width:1024px){
  .video-grid{grid-template-columns:repeat(2,1fr)}
  .expert-grid{grid-template-columns:repeat(2,1fr)}
  .ent-grid{grid-template-columns:repeat(2,1fr)}
  .howto-steps{grid-template-columns:repeat(2,1fr)}
  .review-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
  .contact-grid{grid-template-columns:1fr}
}
@media(max-width:768px){
  .main-nav{display:none;position:absolute;top:100%;left:0;width:100%;background:#0a1628;padding:10px 0;box-shadow:0 4px 20px rgba(0,0,0,.3)}
  .main-nav.active{display:block}
  .main-nav ul{flex-direction:column;padding:0 20px}
  .main-nav a{display:block;padding:10px 14px}
  .mobile-menu-btn{display:block}
  .hero-banner{height:400px}
  .hero-content h1{font-size:1.6rem}
  .hero-content h2{font-size:.95rem}
  .video-grid{grid-template-columns:1fr}
  .feature-grid{grid-template-columns:1fr}
  .ai-grid{grid-template-columns:1fr}
  .community-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:1fr}
  .ent-grid{grid-template-columns:1fr}
  .howto-steps{grid-template-columns:1fr}
  .review-grid{grid-template-columns:1fr}
  .section-header h2{font-size:1.4rem}
  .footer-grid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .section .contact-qrcodes{flex-direction:column}
}
@media(max-width:480px){
  .hero-banner{height:320px}
  .hero-content h1{font-size:1.3rem}
  .hero-btns{flex-direction:column;align-items:center}
  .btn-primary,.btn-secondary{width:100%;text-align:center}
  .share-btns{flex-direction:column;align-items:center}
  .share-btn{width:100%;text-align:center}
}