/* 中草药企业网站样式 - 基于百度SEO优化 */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2d5016;
    --secondary-color: #4a7c2a;
    --accent-color: #6b9f3e;
    --light-green: #8fbc5a;
    --bg-light: #f5f8f1;
    --text-dark: #333;
    --text-light: #666;
    --white: #ffffff;
    --shadow: rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Microsoft YaHei', '微软雅黑', 'SimSun', '宋体', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--white);
    font-size: 16px;
}

/* 头部导航 */
header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    padding: 1rem 0;
    box-shadow: 0 2px 10px var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
    flex-wrap: wrap;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    color: var(--white);
    text-decoration: none;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 30px;
    flex-wrap: wrap;
}

.nav-links a {
    color: var(--white);
    text-decoration: none;
    font-size: 16px;
    transition: color 0.3s;
    padding: 5px 10px;
}

.nav-links a:hover {
    color: var(--light-green);
}

/* 主要内容区域 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* 首页横幅 */
.hero {
    background: linear-gradient(135deg, var(--bg-light), var(--white));
    padding: 60px 20px;
    text-align: center;
    margin-bottom: 40px;
}

.hero h1 {
    font-size: 2.5em;
    color: var(--primary-color);
    margin-bottom: 20px;
    font-weight: bold;
}

.hero p {
    font-size: 1.2em;
    color: var(--text-light);
    max-width: 800px;
    margin: 0 auto;
}

/* 关键词区域 */
.keywords-section {
    background: var(--bg-light);
    padding: 40px 20px;
    margin: 40px 0;
    border-radius: 8px;
}

.keywords-section h2 {
    color: var(--primary-color);
    font-size: 1.8em;
    margin-bottom: 20px;
    text-align: center;
}

/* 产品/内容卡片 */
.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin: 40px 0;
}

.card {
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 6px var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 12px var(--shadow);
}

.card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    display: block;
}

.card-content {
    padding: 20px;
}

.card h3 {
    color: var(--primary-color);
    font-size: 1.3em;
    margin-bottom: 10px;
}

.card p {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 15px;
}

.card a {
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: bold;
    display: inline-block;
    transition: color 0.3s;
}

.card a:hover {
    color: var(--accent-color);
}

/* 视频卡片 */
.video-card {
    position: relative;
    background: var(--bg-light);
    border-radius: 8px;
    overflow: hidden;
    margin: 20px 0;
    box-shadow: 0 4px 8px var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}

.video-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 12px var(--shadow);
}

.video-card img {
    width: 100%;
    height: auto;
    display: block;
    min-height: 300px;
    object-fit: cover;
}

.video-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(45, 80, 22, 0.85);
    color: var(--white);
    padding: 20px 35px;
    border-radius: 50%;
    font-size: 56px;
    cursor: pointer;
    transition: all 0.3s;
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 3px solid var(--white);
}

.video-overlay:hover {
    background: rgba(45, 80, 22, 0.95);
    transform: translate(-50%, -50%) scale(1.1);
}

.video-info {
    padding: 25px;
}

.video-info h3 {
    color: var(--primary-color);
    margin-bottom: 12px;
    font-size: 1.3em;
}

.video-info p {
    color: var(--text-light);
    line-height: 1.6;
}

/* 内容区域 */
.content-section {
    margin: 40px 0;
    padding: 30px;
    background: var(--white);
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--shadow);
}

.content-section h2 {
    color: var(--primary-color);
    font-size: 1.8em;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 10px;
}

.content-section h3 {
    color: var(--secondary-color);
    font-size: 1.4em;
    margin: 25px 0 15px;
}

.content-section p {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 15px;
}

.content-section ul, .content-section ol {
    margin: 15px 0;
    padding-left: 30px;
}

.content-section li {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 8px;
}

/* 专业术语高亮 */
.term {
    color: var(--primary-color);
    font-weight: bold;
}

/* 图片优化 */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

.image-wrapper {
    margin: 20px 0;
    text-align: center;
}

.image-wrapper img {
    border-radius: 8px;
    box-shadow: 0 2px 8px var(--shadow);
}

/* 页脚 */
footer {
    background: var(--primary-color);
    color: var(--white);
    text-align: center;
    padding: 30px 20px;
    margin-top: 60px;
}

footer p {
    margin: 10px 0;
}

footer a {
    color: var(--light-green);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* 面包屑导航 */
.breadcrumb {
    padding: 15px 0;
    color: var(--text-light);
    font-size: 14px;
}

.breadcrumb a {
    color: var(--secondary-color);
    text-decoration: none;
}

.breadcrumb a:hover {
    text-decoration: underline;
}

/* 移动端适配 */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 1.8em;
    }

    .hero p {
        font-size: 1em;
    }

    nav {
        flex-direction: column;
        gap: 15px;
    }

    .nav-links {
        gap: 15px;
        justify-content: center;
    }

    .content-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .content-section {
        padding: 20px;
    }

    .keywords-section {
        padding: 30px 15px;
    }

    .container {
        padding: 15px;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.5em;
    }

    .card-content {
        padding: 15px;
    }

    .video-overlay {
        font-size: 36px;
        padding: 10px 20px;
    }
}

/* 加载优化 */
.lazy-load {
    opacity: 0;
    transition: opacity 0.3s;
}

.lazy-load.loaded {
    opacity: 1;
}