/* Mobile Responsiveness */
@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
    }

    /* Mobile Menu Button */
    .mobile-menu-btn {
        display: flex;
        position: fixed;
        top: 1rem;
        left: 1rem;
        z-index: 100;
        background-color: var(--bg-card);
        border: 1px solid var(--border);
        color: var(--text-main);
        padding: 8px;
        border-radius: var(--radius-sm);
        cursor: pointer;
        box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    }

    /* Sidebar - Off-canvas */
    .sidebar {
        position: fixed;
        top: 0;
        left: -280px;
        /* Hide by default */
        height: 100%;
        width: 260px;
        z-index: 99;
        transition: transform 0.3s ease;
        box-shadow: 2px 0 10px rgba(0, 0, 0, 0.5);
    }

    .sidebar.active {
        transform: translateX(280px);
    }

    /* Backdrop */
    .mobile-backdrop {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0, 0, 0, 0.5);
        z-index: 98;
        opacity: 0;
        transition: opacity 0.3s ease;
    }

    .mobile-backdrop.active {
        display: block;
        opacity: 1;
    }

    /* Main Content Adjustments */
    .main-content {
        padding: var(--spacing-md);
        padding-top: 4rem;
        /* Space for menu button */
    }

    .tool-workspace {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    /* Card Adjustments */
    .card {
        padding: var(--spacing-md);
    }

    /* Typography & Touch Targets */
    .nav-links a {
        padding: 12px;
        /* Larger touch target */
    }

    input[type="number"],
    input[type="text"],
    select {
        font-size: 16px;
        /* Prevent zoom on iOS */
        padding: 10px;
    }

    .quick-select button {
        padding: 8px 12px;
    }

    /* Responsive Tables & Diagrams */
    .circuit-diagram {
        height: auto;
        min-height: 200px;
        padding: var(--spacing-sm);
    }

    .circuit-diagram table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
    }

    .circuit-diagram img {
        max-width: 100%;
        height: auto;
    }
}

/* Desktop - Hide Mobile Elements */
@media (min-width: 769px) {
    .mobile-menu-btn {
        display: none;
    }

    .mobile-backdrop {
        display: none !important;
    }
}