/* 全局样式 */
:root {
    --primary-color: #4CAF50; /* 华中农绿色主题 */
    --secondary-color: #8BC34A;
    --accent-color: #CDDC39;
    --dark-green: #2E7D32;
    --light-green: #C8E6C9;
    --text-color: #333;
    --light-text: #f5f5f5;
}

body {
    font-family: 'Microsoft YaHei', sans-serif;
    margin: 0;
    padding: 0;
    color: var(--text-color);
    line-height: 1.6;
}

/* 页眉样式 */
header {
    background-color: var(--primary-color);
    color: var(--light-text);
    padding: 1rem;
    text-align: center;
}

.logo h1 {
    margin: 0;
    font-size: 2rem;
}

.logo p {
    margin: 0.5rem 0 0;
    font-size: 1rem;
}

nav ul {
    list-style: none;
    padding: 0;
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin: 1rem 0 0;
}

nav a {
    color: var(--light-text);
    text-decoration: none;
    font-weight: bold;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background-color 0.3s;
}

nav a:hover {
    background-color: var(--dark-green);
}

/* 主要内容区 */
main {
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.banner {
    text-align: center;
    padding: 2rem 0;
    background-color: var(--light-green);
    border-radius: 8px;
    margin-bottom: 2rem;
}

.banner h2 {
    color: var(--dark-green);
    font-size: 2rem;
}

.intro {
    background-color: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.feature-card {
    background-color: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-card h3 {
    color: var(--primary-color);
    margin-top: 0;
}

/* 页脚样式 */
footer {
    background-color: var(--dark-green);
    color: var(--light-text);
    text-align: center;
    padding: 1rem;
    margin-top: 2rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    nav ul {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .features {
        grid-template-columns: 1fr;
    }
}