function scrollToContent(){
    let target = document.querySelector('.block');
    target && target.scrollIntoView({ behavior: 'smooth' });
    return false;
}

function scrollToCertificate(){
    let target = document.querySelector('.block--certificate');
    target && target.scrollIntoView({ behavior: 'smooth' });
    return false;
};

function scrollToCatalog(){
    let target = document.getElementById('target_catalog');        
    target && target.scrollIntoView({ behavior: 'smooth' });
    return false;
};

function scrollToDemand(){
    let target = document.getElementById('target_demand');
    target && target.scrollIntoView({ behavior: 'smooth' });
    return false;
};

function clickMenu(type){

    // elements
    let lngsElement = document.getElementById('nav_content_lngs');
    let menuElement = document.getElementById('nav_content_menu');
    
    if(!lngsElement || !menuElement)
        return;
    
    let lngsIsOpen = lngsElement.classList.contains('headermobile__content--show');
    let menuIsOpen = menuElement.classList.contains('headermobile__content--show');
    
    // close all
    closeElements([lngsElement, menuElement]);
    
    if(type === 'lngs' && !lngsIsOpen)
        showElement(lngsElement);
    
    if(type === 'menu' && !menuIsOpen)
        showElement(menuElement);
    
}

function closeElements(elements = []){
    elements.forEach(ele => ele.classList.remove('headermobile__content--show'));
    document.body.classList.remove('no-scroll');
    closeLists();
}

function showElement(element){
    element.classList.add('headermobile__content--show');
    document.body.classList.add('no-scroll');
}

function clickNode(node){

    let item        = node.parentElement;
    let list        = item.querySelector('ul');
    let classList   = list.classList;

    let isVisible = classList.contains('treemobile--show');
    isVisible ? classList.remove('treemobile--show') : classList.add('treemobile--show');

}

function closeLists(){

    let lists = [...document.querySelectorAll('.treemobile')];
    lists.forEach(item => item.classList.remove('treemobile--show'));
    
}