/* 基础重置 */
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}
a { text-decoration: none; color: inherit; transition: color 0.3s; }
ul { list-style: none; }
img { max-width: 100%; height: auto; display: block; }

/* 容器与布局 */
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 15px; }
.section { padding: 60px 0; }
.bg-light { background-color: #fff; }
.bg-dark { background-color: #1a202c; color: #fff; }
.text-center { text-align: center; }
.text-white { color: #fff; }
.mt-3 { margin-top: 15px; }
.mt-4 { margin-top: 20px; }
.mt-5 { margin-top: 40px; }
.mb-4 { margin-bottom: 20px; }

/* 按钮 */
.btn {
    display: inline-block;
    padding: 10px 24px;
    border-radius: 4px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.3s;
}
.btn-primary { background-color: #2e7d32; color: #fff; }
.btn-primary:hover { background-color: #1b5e20; }
.btn-outline { border: 2px solid #2e7d32; color: #2e7d32; background: transparent; }
.btn-outline:hover { background-color: #2e7d32; color: #fff; }

/* 头部导航 */
.site-header { background-color: #fff; box-shadow: 0 2px 10px rgba(0,0,0,0.1); position: sticky; top: 0; z-index: 100; }
.header-inner { display: flex; justify-content: space-between; align-items: center; height: 80px; }
.logo a { display: flex; align-items: center; gap: 10px; }
.logo img { border-radius: 8px; }
.logo h1 { font-size: 24px; color: #2e7d32; margin: 0; }
.logo-sub { font-size: 12px; color: #666; display: block; }
.main-nav ul { display: flex; gap: 25px; }
.main-nav a { font-weight: 600; color: #333; }
.main-nav a:hover { color: #2e7d32; }
.mobile-menu-btn { display: none; background: none; border: none; font-size: 24px; cursor: pointer; }

/* 搜索区域 */
.search-bar-container { background-color: #f1f8e9; padding: 15px 0; border-top: 1px solid #e0e0e0; }
.search-box { display: flex; max-width: 600px; margin: 0 auto; }
#search-input { flex: 1; padding: 10px 15px; border: 1px solid #ccc; border-radius: 4px 0 0 4px; outline: none; }
#search-btn { padding: 10px 20px; background-color: #2e7d32; color: #fff; border: none; border-radius: 0 4px 4px 0; cursor: pointer; }
.hot-searches { max-width: 600px; margin: 10px auto 0; font-size: 13px; color: #666; }
.hot-searches a { color: #2e7d32; margin-left: 10px; }

/* 面包屑 */
.breadcrumb-wrap { background: #fff; padding: 15px 0; border-bottom: 1px solid #eee; }
.breadcrumb { font-size: 14px; color: #666; }
.breadcrumb a { color: #2e7d32; }

/* Banner大图 */
.hero-banner {
    position: relative;
    height: 500px;
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
}
.hero-banner::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.5);
}
.hero-content {
    position: relative;
    z-index: 1;
    color: #fff;
    max-width: 800px;
}
.hero-content h2 { font-size: 42px; margin-bottom: 20px; }
.hero-desc { font-size: 18px; margin-bottom: 30px; opacity: 0.9; }
.hero-actions { display: flex; gap: 15px; }

/* 核心模块 */
.module-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 30px; margin-top: 40px; }
.module-card { background: #fff; padding: 30px; border-radius: 8px; box-shadow: 0 5px 15px rgba(0,0,0,0.05); text-align: center; transition: transform 0.3s; }
.module-card:hover { transform: translateY(-5px); }
.module-icon { font-size: 40px; margin-bottom: 15px; }
.module-card h3 { color: #2e7d32; margin-bottom: 10px; }

/* 视频卡片 (重点SEO) */
.section-header { display: flex; justify-content: space-between; align-items: flex-end; margin-bottom: 30px; border-bottom: 2px solid #2e7d32; padding-bottom: 10px; }
.section-header h2 { font-size: 28px; color: #333; }
.view-all { color: #2e7d32; font-weight: 600; }
.video-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 25px; }
.video-card { background: #fff; border-radius: 8px; overflow: hidden; box-shadow: 0 3px 10px rgba(0,0,0,0.1); cursor: pointer; transition: transform 0.3s; }
.video-card:hover { transform: translateY(-5px); }
.video-thumb { position: relative; padding-top: 56.25%; /* 16:9 */ overflow: hidden; }
.video-thumb img { position: absolute; top: 0; left: 0; width: 100%; height: 100%; object-fit: cover; }
.play-btn { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); width: 60px; height: 60px; background: rgba(46,125,50,0.8); color: #fff; border-radius: 50%; display: flex; justify-content: center; align-items: center; font-size: 24px; opacity: 0; transition: opacity 0.3s; }
.video-card:hover .play-btn { opacity: 1; }
.video-badge { position: absolute; top: 10px; right: 10px; background: #e53935; color: #fff; padding: 3px 8px; border-radius: 4px; font-size: 12px; font-weight: bold; }
.video-duration { position: absolute; bottom: 10px; right: 10px; background: rgba(0,0,0,0.7); color: #fff; padding: 2px 6px; border-radius: 4px; font-size: 12px; }
.video-info { padding: 15px; }
.video-title { font-size: 16px; margin-bottom: 8px; line-height: 1.4; color: #333; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.video-desc { font-size: 13px; color: #666; margin-bottom: 10px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.video-meta { display: flex; justify-content: space-between; font-size: 12px; color: #999; }

/* 专家团队 */
.expert-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 30px; }
.expert-card { background: #fff; border-radius: 8px; overflow: hidden; box-shadow: 0 3px 10px rgba(0,0,0,0.05); }
.expert-card img { width: 100%; height: 250px; object-fit: cover; }
.expert-info { padding: 20px; text-align: center; }
.expert-title { color: #2e7d32; font-size: 14px; font-weight: bold; margin-bottom: 5px; }
.expert-actions { margin-top: 15px; display: flex; gap: 10px; justify-content: center; }

/* 评价与FAQ */
.review-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; }
.review-card { background: #f1f8e9; padding: 20px; border-radius: 8px; border-left: 4px solid #2e7d32; }
.review-stars { color: #fbc02d; margin-bottom: 10px; }
.review-author { font-weight: bold; margin-top: 10px; text-align: right; }

.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { background: #fff; margin-bottom: 10px; border-radius: 4px; box-shadow: 0 2px 5px rgba(0,0,0,0.05); }
.faq-q { padding: 15px 20px; font-weight: bold; cursor: pointer; display: flex; justify-content: space-between; }
.faq-a { padding: 0 20px 15px; display: none; color: #666; }
.toggle { color: #2e7d32; font-weight: bold; }

/* 合作Logo墙 */
.partner-logos { display: flex; flex-wrap: wrap; justify-content: center; gap: 30px; align-items: center; }
.partner-logos img { max-height: 60px; filter: grayscale(100%); opacity: 0.7; transition: all 0.3s; }
.partner-logos img:hover { filter: grayscale(0); opacity: 1; }

/* 视频弹窗 */
.video-modal { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.9); z-index: 1000; align-items: center; justify-content: center; }
.modal-content { background: #fff; width: 90%; max-width: 800px; border-radius: 8px; overflow: hidden; position: relative; }
.modal-close { position: absolute; top: 10px; right: 15px; font-size: 30px; color: #fff; cursor: pointer; z-index: 10; text-shadow: 0 2px 4px rgba(0,0,0,0.5); }
.modal-video-container { position: relative; width: 100%; padding-top: 56.25%; background: #000; }
.modal-video-container img { position: absolute; top: 0; left: 0; width: 100%; height: 100%; object-fit: contain; }
.modal-play-icon { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); font-size: 60px; color: rgba(255,255,255,0.8); cursor: pointer; }
.modal-info { padding: 20px; }
.video-stats { display: flex; gap: 20px; color: #666; font-size: 14px; }

/* 底部 */
.site-footer { background: #1a202c; color: #ccc; padding: 60px 0 20px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-logo { display: flex; align-items: center; gap: 10px; margin-bottom: 15px; }
.footer-logo h2 { color: #fff; margin: 0; }
.social-links { display: flex; gap: 10px; margin-top: 20px; }
.share-btn { background: #2d3748; color: #fff; border: none; padding: 5px 10px; border-radius: 4px; cursor: pointer; }
.share-btn:hover { background: #2e7d32; }
.footer-col h3 { color: #fff; margin-bottom: 20px; font-size: 18px; }
.footer-links li { margin-bottom: 10px; }
.footer-links a:hover { color: #2e7d32; }
.contact-info li { margin-bottom: 10px; }
.qrcode-col { display: flex; gap: 15px; }
.qrcode-item { text-align: center; }
.qr-placeholder { width: 100px; height: 100px; background: #fff; color: #333; display: flex; align-items: center; justify-content: center; margin-bottom: 10px; border-radius: 4px; font-size: 12px; }
.footer-bottom { border-top: 1px solid #2d3748; padding-top: 20px; display: flex; justify-content: space-between; font-size: 14px; }

/* 内部页面样式 */
.inner-page-header { background: #2e7d32; color: #fff; padding: 60px 0; text-align: center; }
.inner-page-header h1 { font-size: 36px; margin-bottom: 10px; }

/* 响应式 */
@media (max-width: 768px) {
    .header-inner { flex-wrap: wrap; }
    .main-nav { display: none; width: 100%; order: 3; background: #fff; padding: 15px 0; border-top: 1px solid #eee; }
    .main-nav.active { display: block; }
    .main-nav ul { flex-direction: column; gap: 15px; text-align: center; }
    .mobile-menu-btn { display: block; }
    .footer-grid { grid-template-columns: 1fr; gap: 30px; }
    .footer-bottom { flex-direction: column; text-align: center; gap: 10px; }
    .hero-content h2 { font-size: 32px; }
}

/* 隐藏SEO文字块 */
.seo-text-block { position: absolute; left: -9999px; top: -9999px; }