/* ===== 小马拉大车 - 植物视频社区 全站样式 ===== */
/* 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","Hiragino Sans GB","Microsoft YaHei","WenQuanYi Micro Hei",sans-serif;color:#333;background:#f8f9fa;line-height:1.8;overflow-x:hidden}
a{color:#2d8f4e;text-decoration:none;transition:color .3s}
a:hover{color:#1a6b35}
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:1.5rem;font-weight:700;color:#2d8f4e}
.main-nav{display:flex;gap:0}
.main-nav a{padding:10px 16px;font-size:.95rem;color:#555;font-weight:500;transition:all .3s;border-bottom:3px solid transparent}
.main-nav a:hover,.main-nav a.active{color:#2d8f4e;border-bottom-color:#2d8f4e}
.mobile-menu-btn{display:none;background:none;border:none;font-size:1.5rem;cursor:pointer;color:#333}

/* 搜索框 */
.search-bar{background:#f0f7f2;padding:12px 0;border-bottom:1px solid #e0e8e2}
.search-bar .container{display:flex;justify-content:center}
.search-box{display:flex;max-width:600px;width:100%}
.search-box input{flex:1;padding:10px 18px;border:2px solid #2d8f4e;border-right:none;border-radius:25px 0 0 25px;font-size:.95rem;outline:none;background:#fff}
.search-box input:focus{border-color:#1a6b35;box-shadow:0 0 8px rgba(45,143,78,.2)}
.search-box button{padding:10px 24px;background:#2d8f4e;color:#fff;border:2px solid #2d8f4e;border-radius:0 25px 25px 0;cursor:pointer;font-size:.95rem;transition:background .3s}
.search-box button:hover{background:#1a6b35}

/* ===== Banner ===== */
.hero-banner{position:relative;height:520px;overflow:hidden;background:#1a1a1a}
.hero-banner img{width:100%;height:100%;object-fit:cover;opacity:.75}
.hero-overlay{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:20px;background:linear-gradient(180deg,rgba(0,0,0,.2),rgba(0,0,0,.55))}
.hero-overlay h1{font-size:2.8rem;color:#fff;margin-bottom:16px;text-shadow:2px 2px 8px rgba(0,0,0,.5)}
.hero-overlay p{font-size:1.15rem;color:rgba(255,255,255,.9);max-width:700px;line-height:1.9;text-shadow:1px 1px 4px rgba(0,0,0,.4)}

/* ===== 面包屑 ===== */
.breadcrumb{padding:12px 0;font-size:.85rem;color:#888}
.breadcrumb a{color:#2d8f4e}
.breadcrumb span{margin:0 6px;color:#ccc}

/* ===== 通用区块 ===== */
.section{padding:60px 0}
.section-alt{background:#fff}
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:1.9rem;color:#222;margin-bottom:8px}
.section-title p{color:#777;font-size:1rem}
.section-title h2 .highlight{color:#2d8f4e}

/* ===== 视频卡片网格 ===== */
.video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.video-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 16px rgba(0,0,0,.06);transition:transform .3s,box-shadow .3s;cursor:pointer}
.video-card:hover{transform:translateY(-6px);box-shadow:0 8px 30px rgba(0,0,0,.12)}
.video-thumb{position:relative;padding-top:56.25%;overflow:hidden;background:#eee}
.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;top:50%;left:50%;transform:translate(-50%,-50%);width:56px;height:56px;background:rgba(45,143,78,.85);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s;pointer-events:none}
.play-btn::after{content:"";display:block;width:0;height:0;border-left:20px solid #fff;border-top:12px solid transparent;border-bottom:12px solid transparent;margin-left:4px}
.video-card:hover .play-btn{opacity:1}
.video-info{padding:14px 16px}
.video-info h3{font-size:.95rem;color:#222;margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;gap:12px;font-size:.8rem;color:#999}
.video-meta span{display:flex;align-items:center;gap:4px}
.video-tag{display:inline-block;background:#e8f5e9;color:#2d8f4e;padding:2px 8px;border-radius:10px;font-size:.75rem;margin-top:6px}

/* ===== 专家卡片 ===== */
.expert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.expert-card{background:#fff;border-radius:12px;padding:28px 20px;text-align:center;box-shadow:0 4px 16px rgba(0,0,0,.06);transition:transform .3s}
.expert-card:hover{transform:translateY(-4px)}
.expert-card img{width:100px;height:100px;border-radius:50%;object-fit:cover;margin:0 auto 16px;border:3px solid #e8f5e9}
.expert-card h4{font-size:1.05rem;color:#222;margin-bottom:4px}
.expert-card .role{color:#2d8f4e;font-size:.85rem;margin-bottom:10px}
.expert-card p{font-size:.85rem;color:#666;line-height:1.7}
.expert-card .btn-sm{display:inline-block;margin-top:12px;padding:6px 18px;background:#2d8f4e;color:#fff;border-radius:20px;font-size:.85rem;transition:background .3s}
.expert-card .btn-sm:hover{background:#1a6b35}

/* ===== FAQ ===== */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{border-bottom:1px solid #eee;padding:18px 0}
.faq-q{font-weight:600;color:#222;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-size:1rem}
.faq-q::after{content:"+";font-size:1.3rem;color:#2d8f4e;transition:transform .3s}
.faq-item.active .faq-q::after{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .4s ease;color:#666;font-size:.92rem;line-height:1.8}
.faq-item.active .faq-a{max-height:300px;padding-top:12px}

/* ===== 用户评价 ===== */
.review-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.review-card{background:#fff;border-radius:12px;padding:24px;box-shadow:0 4px 16px rgba(0,0,0,.06)}
.review-card .stars{color:#f5a623;font-size:1.1rem;margin-bottom:10px}
.review-card p{font-size:.9rem;color:#555;line-height:1.8;margin-bottom:12px}
.review-card .reviewer{display:flex;align-items:center;gap:10px;font-size:.85rem;color:#888}
.review-card .reviewer strong{color:#333}

/* ===== 合作品牌 ===== */
.partner-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:30px;padding:20px 0}
.partner-wall .partner-item{width:140px;height:80px;background:#fff;border-radius:10px;display:flex;align-items:center;justify-content:center;box-shadow:0 2px 8px rgba(0,0,0,.06);padding:10px;font-weight:600;color:#666;font-size:.9rem}

/* ===== 社交分享 ===== */
.share-bar{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;padding:20px 0}
.share-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 20px;border-radius:20px;color:#fff;font-size:.9rem;transition:opacity .3s}
.share-btn:hover{opacity:.85;color:#fff}
.share-btn.wechat{background:#07c160}
.share-btn.weibo{background:#e6162d}
.share-btn.douyin{background:#161823}
.share-btn.bilibili{background:#00a1d6}

/* ===== 联系我们 ===== */
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.contact-box{background:#fff;border-radius:12px;padding:28px;text-align:center;box-shadow:0 4px 16px rgba(0,0,0,.06)}
.contact-box h4{color:#222;margin-bottom:8px;font-size:1.05rem}
.contact-box p{color:#666;font-size:.9rem;line-height:1.8}
.contact-box img{max-width:160px;margin:12px auto 0}

/* ===== How-To 指南 ===== */
.howto-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:30px}
.howto-step{background:#fff;border-radius:12px;padding:28px 20px;text-align:center;box-shadow:0 4px 16px rgba(0,0,0,.06)}
.howto-step .step-num{width:48px;height:48px;background:#2d8f4e;color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.3rem;font-weight:700;margin:0 auto 16px}
.howto-step h4{color:#222;margin-bottom:8px}
.howto-step p{color:#666;font-size:.88rem}

/* ===== AI赋能 ===== */
.ai-features{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.ai-card{background:linear-gradient(135deg,#f0f7f2,#e8f5e9);border-radius:12px;padding:30px;text-align:center;transition:transform .3s}
.ai-card:hover{transform:translateY(-4px)}
.ai-card .ai-icon{font-size:2.5rem;margin-bottom:16px}
.ai-card h4{color:#222;margin-bottom:8px;font-size:1.1rem}
.ai-card p{color:#555;font-size:.9rem;line-height:1.8}

/* ===== 视频时长标签 ===== */
.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;z-index:5;letter-spacing:.5px}
.video-preview{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:1;display:none}
.video-card:hover .video-preview{display:block}

/* ===== 页脚 ===== */
.site-footer{background:#1a2e1f;color:rgba(255,255,255,.7);padding:50px 0 0}
.footer-inner{display:grid;grid-template-columns:repeat(4,1fr);gap:30px;max-width:1200px;margin:0 auto;padding:0 20px}
.footer-col h4{color:#fff;margin-bottom:16px;font-size:1.05rem}
.footer-col p,.footer-col a{color:rgba(255,255,255,.65);font-size:.9rem;line-height:2}
.footer-col a:hover{color:#4ecdc4}
.footer-col img{max-width:120px;margin-top:8px;border-radius:8px}
.footer-bottom{text-align:center;padding:20px;margin-top:40px;border-top:1px solid rgba(255,255,255,.1);font-size:.85rem;color:rgba(255,255,255,.5)}

/* ===== 内页通用 ===== */
.page-header{background:linear-gradient(135deg,#2d8f4e,#1a6b35);padding:60px 0;text-align:center;color:#fff}
.page-header h1{font-size:2.2rem;margin-bottom:8px}
.page-header p{font-size:1rem;opacity:.85}
.page-content{padding:50px 0}
.page-content h2{font-size:1.6rem;color:#222;margin:30px 0 16px}
.page-content h3{font-size:1.3rem;color:#333;margin:24px 0 12px}
.page-content p{color:#555;line-height:2;margin-bottom:16px}
.content-img{border-radius:12px;margin:20px 0;box-shadow:0 4px 16px rgba(0,0,0,.08)}

/* ===== MCP前端占位 ===== */
.mcp-widget{background:#f0f7f2;border:2px dashed #2d8f4e;border-radius:12px;padding:30px;text-align:center;margin:20px 0}
.mcp-widget h4{color:#2d8f4e;margin-bottom:8px}
.mcp-widget p{color:#666;font-size:.9rem}

/* ===== 干扰标签隐藏 ===== */
.jrb{position:absolute;width:0;height:0;overflow:hidden;opacity:0;pointer-events:none;z-index:-9999}

/* ===== 响应式 ===== */
@media(max-width:1024px){
  .video-grid,.expert-grid,.review-grid{grid-template-columns:repeat(2,1fr)}
  .footer-inner{grid-template-columns:repeat(2,1fr)}
  .contact-grid{grid-template-columns:1fr}
  .howto-steps{grid-template-columns:repeat(2,1fr)}
  .ai-features{grid-template-columns:1fr}
}
@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}
  .mobile-menu-btn{display:block}
  .hero-banner{height:360px}
  .hero-overlay h1{font-size:1.8rem}
  .hero-overlay p{font-size:.95rem}
  .video-grid,.expert-grid,.review-grid{grid-template-columns:1fr}
  .footer-inner{grid-template-columns:1fr}
  .howto-steps{grid-template-columns:1fr}
  .section{padding:40px 0}
  .search-box{max-width:100%}
}
@media(max-width:480px){
  .hero-banner{height:280px}
  .hero-overlay h1{font-size:1.4rem}
  .section-title h2{font-size:1.4rem}
  .partner-wall .partner-item{width:100px;height:60px;font-size:.8rem}
}