/* 分类容器 */
.categories-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
}

/* 分类卡片 */
.category-card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    border: 2px solid transparent;
}

.category-card:hover {
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
    transform: translateY(-5px);
    border-color: #667eea;
}

/* 分类图标 */
.category-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: #667eea;
}

/* 分类标题 */
.category-card h2 {
    font-size: 1.5rem;
    margin-bottom: 0.8rem;
    color: #333;
}

/* 分类描述 */
.category-card p {
    color: #666;
    font-size: 0.95rem;
    line-height: 1.5;
    margin-bottom: 1.5rem;
    min-height: 60px;
}

/* 进入按钮 */
.enter-btn {
    display: inline-block;
    padding: 0.7rem 1.5rem;
    background-color: #667eea;
    color: white;
    text-decoration: none;
    border-radius: 25px;
    font-weight: 500;
    transition: all 0.3s ease;
    border: 2px solid #667eea;
}

.enter-btn:hover {
    background-color: white;
    color: #667eea;
    transform: scale(1.05);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .categories-container {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .category-card {
        padding: 1.5rem;
    }
    
    .category-icon {
        font-size: 2.5rem;
    }
    
    .category-card h2 {
        font-size: 1.3rem;
    }
}

/* 搜索结果为空状态 */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: #666;
}

.empty-state i {
    font-size: 4rem;
    margin-bottom: 1rem;
    color: #ccc;
}

.empty-state h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: #333;
}

.empty-state p {
    font-size: 1rem;
}