@media (max-width: 1024px) {
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
    .grid-4 { grid-template-columns: repeat(2, 1fr); }

    .split-editor,
    .md-editor {
        grid-template-columns: 1fr;
    }

    .chat-layout {
        flex-direction: column;
    }

    .chat-sidebar {
        width: 100%;
        max-height: 200px;
        border-right: none;
        border-bottom: 1px solid var(--border-primary);
    }
}

@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -260px;
        top: 0;
        bottom: 0;
        z-index: 200;
        transition: left var(--transition-normal);
    }

    .sidebar.mobile-open {
        left: 0;
    }

    .task-status-bar {
        left: 0;
    }

    .page {
        padding: 1rem;
    }

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

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

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

    .form-row {
        grid-template-columns: 1fr;
    }

    .column-builder-header,
    .column-builder-row {
        grid-template-columns: 1fr 100px 60px 30px;
    }

    .chat-message {
        max-width: 95%;
    }

    .notes-panel {
        width: 100%;
        right: -100%;
    }

    .fab {
        bottom: 1.5rem;
        right: 1.5rem;
    }

    .data-table {
        display: block;
        overflow-x: auto;
    }

    .auth-card {
        padding: 1.5rem;
    }

    .mobile-menu-btn {
        display: flex !important;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 13px;
    }

    .page {
        padding: 0.75rem;
    }

    .chat-input-area {
        padding: 0.75rem;
    }

    .chat-message {
        max-width: 100%;
    }
}

/* Mobile menu button - hidden by default on desktop */
.mobile-menu-btn {
    display: none;
    position: fixed;
    top: 0.75rem;
    left: 0.75rem;
    z-index: 150;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    color: var(--text-primary);
    cursor: pointer;
    align-items: center;
    justify-content: center;
}

/* Mobile overlay */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 199;
}

.sidebar-overlay.visible {
    display: block;
}