/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

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

/* 头部样式 */
header {
    background-color: #4CAF50;
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
}

nav ul {
    display: flex;
    list-style: none;
}

nav ul li {
    margin-left: 2rem;
}

nav ul li a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

nav ul li a:hover {
    color: #e8f5e8;
}

/* 英雄区域样式 */
.hero {
    background: linear-gradient(135deg, #4CAF50 0%, #45a049 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* 健康知识区域样式 */
.health-tips {
    padding: 4rem 0;
}

.health-tips h2 {
    text-align: center;
    color: #333;
    margin-bottom: 2rem;
    font-size: 2rem;
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.tip-card {
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.tip-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.15);
}

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

.tip-content {
    padding: 1.5rem;
}

.tip-content h3 {
    color: #4CAF50;
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.tip-content p {
    color: #666;
    margin-bottom: 1.5rem;
}

.read-more {
    display: inline-block;
    background-color: #4CAF50;
    color: white;
    padding: 0.5rem 1rem;
    text-decoration: none;
    border-radius: 4px;
    transition: background-color 0.3s ease;
    font-weight: 500;
}

.read-more:hover {
    background-color: #45a049;
}

/* 关于我们区域样式 */
.about {
    background-color: #e8f5e8;
    padding: 4rem 0;
    text-align: center;
}

.about h2 {
    color: #333;
    margin-bottom: 1.5rem;
    font-size: 2rem;
}

.about p {
    color: #666;
    max-width: 800px;
    margin: 0 auto;
}

/* 页脚样式 */
footer {
    background-color: #333;
    color: white;
    padding: 2rem 0;
    text-align: center;
}

footer p {
    margin-bottom: 0.5rem;
    opacity: 0.8;
}

/* 文章详情页样式 */
.article-detail {
    padding: 4rem 0;
}

.article-detail .container {
    max-width: 800px;
    background-color: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.article-cover {
    width: 100%;
    max-height: 360px;
    object-fit: cover;
    border-radius: 6px;
    display: block;
    margin-bottom: 2rem;
}

.article-header {
    margin-bottom: 2rem;
    border-bottom: 1px solid #eee;
    padding-bottom: 1rem;
}

.article-header h2 {
    color: #333;
    margin-bottom: 0.5rem;
    font-size: 2rem;
}

.article-meta {
    color: #666;
    font-size: 0.9rem;
}

.article-content {
    color: #333;
    line-height: 1.8;
}

.article-content p {
    margin-bottom: 1.5rem;
}

.article-content h3 {
    color: #4CAF50;
    margin: 2rem 0 1rem;
    font-size: 1.5rem;
}

.article-content ul, .article-content ol {
    margin: 1.5rem 0;
    padding-left: 2rem;
}

.article-content li {
    margin-bottom: 0.5rem;
}

.back-link {
    display: inline-block;
    margin-top: 2rem;
    background-color: #4CAF50;
    color: white;
    padding: 0.75rem 1.5rem;
    text-decoration: none;
    border-radius: 4px;
    transition: background-color 0.3s ease;
    font-weight: 500;
}

.back-link:hover {
    background-color: #45a049;
}

/* 响应式设计 */
@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        align-items: flex-start;
    }

    nav ul {
        margin-top: 1rem;
        flex-wrap: wrap;
    }

    nav ul li {
        margin-left: 0;
        margin-right: 1.5rem;
        margin-bottom: 0.5rem;
    }

    .hero h2 {
        font-size: 2rem;
    }

    .tips-grid {
        grid-template-columns: 1fr;
    }

    .article-detail .container {
        padding: 1.5rem;
    }

    .article-header h2 {
        font-size: 1.8rem;
    }
}

@media (max-width: 480px) {
    .logo {
        font-size: 1.5rem;
    }

    .hero {
        padding: 3rem 0;
    }

    .hero h2 {
        font-size: 1.8rem;
    }

    .health-tips, .about {
        padding: 3rem 0;
    }

    .article-detail {
        padding: 3rem 0;
    }
}