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

body {
    font-family: 'Noto Sans SC', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

/* 导航栏样式 */
.navbar {
    background-color: #2c3e50;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.logo h1 {
    color: #fff;
    font-size: 1.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    color: #fff;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 0.5px;
}

.nav-links a:hover {
    color: #3498db;
    transform: translateY(-2px);
}

/* 主要内容区域 */
main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.section {
    margin-bottom: 3rem;
    background: #fff;
    border-radius: 10px;
    padding: 2rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    transition: transform 0.3s ease;
}

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

.section h2 {
    color: #2c3e50;
    margin-bottom: 1.5rem;
    font-size: 2rem;
    border-bottom: 2px solid #3498db;
    padding-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* 分类卡片网格 */
.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.category-card {
    background: #fff;
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
    border: 1px solid #eee;
}

.category-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.category-card h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
    font-size: 1.4rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.category-card ul {
    list-style: none;
}

.category-card li {
    margin-bottom: 0.8rem;
}

.category-card a {
    color: #3498db;
    text-decoration: none;
    transition: all 0.3s ease;
    display: block;
    padding: 0.5rem 0;
}

.category-card a:hover {
    color: #2980b9;
    padding-left: 5px;
}

/* 页脚样式 */
footer {
    background-color: #2c3e50;
    color: #fff;
    padding: 2rem 0;
    margin-top: 3rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
    font-size: 0.9rem;
    letter-spacing: 0.5px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        padding: 1rem;
    }

    .nav-links {
        margin-top: 1rem;
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }

    .section {
        padding: 1rem;
    }

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

    .logo h1 {
        font-size: 1.5rem;
    }

    .section h2 {
        font-size: 1.6rem;
    }
}