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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB',
        'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    text-align: center;
    padding: 60px 20px 40px;
}

.site-title {
    font-size: 3rem;
    color: #fff;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.site-subtitle {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.9);
}

.main-content {
    flex: 1;
}

.category-section {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.section-title {
    font-size: 2rem;
    color: #333;
    margin-bottom: 30px;
    text-align: center;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    padding: 20px 0;
}

.category-card {
    background: linear-gradient(145deg, #ffffff 0%, #f5f5f5 100%);
    border-radius: 16px;
    padding: 40px 30px;
    text-align: center;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    border: 2px solid transparent;
}

.category-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.2);
    border-color: #667eea;
}

.category-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.category-name {
    font-size: 1.8rem;
    color: #333;
    margin-bottom: 10px;
}

.category-desc {
    font-size: 1rem;
    color: #666;
}

.footer {
    text-align: center;
    padding: 30px 20px;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .site-title {
        font-size: 2rem;
    }

    .site-subtitle {
        font-size: 1rem;
    }

    .category-section {
        padding: 30px 20px;
    }

    .section-title {
        font-size: 1.5rem;
    }

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

    .category-card {
        padding: 30px 20px;
    }

    .category-icon {
        font-size: 3rem;
    }

    .category-name {
        font-size: 1.5rem;
    }
}