.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
    overflow: hidden;
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-base);
    overflow-y: auto;
    position: relative;
}

.content-area {
    padding: 40px;
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
}

.page-header {
    margin-bottom: 32px;
}

.page-header h1 {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.025em;
    margin-bottom: 6px;
}

.page-header p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* --- ESTILOS RESPONSIVE PARA MÓVILES --- */
@media (max-width: 768px) {
    html, body {
        height: auto !important;
        overflow: auto !important;
        overflow-x: hidden !important;
        width: 100% !important;
        margin: 0 !important;
        padding: 0 !important;
    }

    .app-container {
        display: block !important;
        height: auto !important;
        min-height: 100vh;
        width: 100% !important;
        overflow: visible !important;
    }

    .main-content {
        width: 100% !important;
        height: auto !important;
        margin-left: 0 !important;
        padding: 0 !important;
        overflow: visible !important;
    }

    /* Barra superior optimizada: Hamburguesa | Buscador | Avatar */
    .topbar {
        display: flex !important;
        flex-direction: row !important;
        align-items: center !important;
        justify-content: space-between !important;
        gap: 8px !important;
        padding: 10px 12px !important;
        width: 100% !important;
        box-sizing: border-box !important;
        position: relative !important;
    }

    /* Botón hamburguesa */
    .mobile-menu-toggle {
        display: flex !important;
        align-items: center;
        justify-content: center;
        background: transparent;
        border: none;
        color: var(--text-primary);
        font-size: 24px;
        cursor: pointer;
        padding: 4px;
    }

    .search-container {
        flex: 1 !important;
        margin: 0 4px !important;
        width: auto !important;
    }

    .search-input {
        width: 100% !important;
        font-size: 13px !important;
        padding: 8px 8px 8px 32px !important;
        box-sizing: border-box !important;
    }

    .topbar-right {
        display: flex !important;
        align-items: center;
    }

    .user-avatar {
        width: 32px !important;
        height: 32px !important;
        min-width: 32px !important;
    }

    .content-area {
        padding: 20px 16px !important;
        width: 100% !important;
        box-sizing: border-box !important;
    }

    /* Forzar una sola columna en grids y tarjetas */
    div[style*="grid-template-columns"], 
    .qr-generator-container, 
    .library-grid {
        display: flex !important;
        flex-direction: column !important;
        width: 100% !important;
        grid-template-columns: 1fr !important;
        gap: 16px !important;
    }

    .card, form, .qr-card {
        width: 100% !important;
        box-sizing: border-box !important;
    }

    /* Menú lateral oculto por defecto (Off-canvas) que se desliza al activarse */
    aside.sidebar, .sidebar {
        display: flex !important;
        position: fixed !important;
        top: 0;
        left: -280px;
        width: 260px !important;
        height: 100vh !important;
        background-color: var(--bg-surface, #121214) !important;
        z-index: 9999 !important;
        transition: left 0.3s ease-in-out !important;
        box-shadow: 5px 0 25px rgba(0,0,0,0.5);
        visibility: visible !important;
    }

    aside.sidebar.mobile-open, .sidebar.mobile-open {
        left: 0 !important;
    }
}