/* Responsive System */

/* Large Tablets & Small Laptops (< 1024px) */
@media (max-width: 1024px) {
    .dash-grid {
        grid-template-columns: 1fr;
    }

    .form-grid-3 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .grid-cols-4 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .col-span-8, .col-span-4, .col-span-6 {
        grid-column: span 12 / span 12;
    }

    .builder-layout {
        grid-template-columns: 1fr;
        height: auto;
    }

    .auth-brand-panel {
        flex: 0 0 40%;
        padding: var(--spacing-8) var(--spacing-6);
    }
}

/* Tablets & Mobile (< 768px) */
@media (max-width: 768px) {
    .app-shell {
        flex-direction: column;
        overflow-x: hidden;
        max-width: 100%;
    }

    .menu-toggle {
        display: inline-flex;
    }

    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        width: min(280px, 86vw);
        height: 100%;
        transform: translateX(-100%);
        transition: transform 0.2s ease;
        z-index: 80;
        border-right: 1px solid rgba(255, 255, 255, 0.08);
        border-bottom: none;
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar-brand {
        padding: var(--spacing-3) var(--spacing-4);
    }

    .sidebar-nav {
        display: flex;
        flex-direction: column;
        overflow-y: auto;
        flex: 1;
    }

    .sidebar-footer {
        display: none;
    }

    .sidebar.open .sidebar-footer {
        display: block;
    }

    .nav-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(15, 23, 42, 0.55);
        z-index: 70;
    }

    .nav-overlay.is-visible {
        display: block;
    }

    body.nav-locked {
        overflow: hidden;
    }

    .top-header {
        padding: 0 var(--spacing-4);
    }

    .page-container {
        padding: var(--spacing-4);
    }

    .page-header {
        flex-direction: column;
        align-items: stretch;
    }

    .form-grid,
    .form-grid-2,
    .form-grid-3,
    .smtp-status-grid,
    .checkbox-grid {
        grid-template-columns: 1fr;
    }

    .page-actions {
        margin-top: var(--spacing-3);
    }

    .auth-split-wrapper {
        flex-direction: column;
    }

    .auth-brand-panel {
        flex: none;
        padding: var(--spacing-8) var(--spacing-6);
    }

    .auth-form-panel {
        padding: var(--spacing-6) var(--spacing-4);
    }

    .grid-cols-3, .grid-cols-2, .grid-cols-4 {
        grid-template-columns: 1fr;
    }

    .dash-welcome {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-4);
    }

    .dash-actions {
        width: 100%;
        flex-direction: column;
    }

    .dash-actions .btn {
        width: 100%;
    }

    .live-progress-stats {
        grid-template-columns: repeat(2, 1fr);
    }

    .dl-horizontal {
        grid-template-columns: 1fr;
        gap: var(--spacing-1);
    }

    .dl-horizontal dt {
        font-weight: 600;
    }

    .dl-horizontal dd {
        margin-bottom: var(--spacing-3);
    }
}