@media (max-width: 992px) {
    .sidebar {
        width: 200px;
    }
    .main-content {
        margin-left: 200px;
        width: calc(100% - 200px);
    }
}

@media (max-width: 768px) {
    .container {
        flex-direction: column;
    }
    .sidebar {
        position: static;
        width: 100%;
        height: auto;
        border-bottom: 1px solid var(--sidebar-hover-bg);
    }
    .main-content {
        margin-left: 0;
        width: 100%;
    }
    .category-nav {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        padding: var(--spacing-sm) 0;
    }
    .category-nav li a {
        margin: var(--spacing-xs);
    }
    header {
        padding: var(--spacing-xl);
    }
    header h1 {
        font-size: 2rem;
    }
    .tool-grid {
        grid-template-columns: 1fr;
    }
}