@media screen and (max-width: 800px)
{
  button {
    font-size: 14px;
    padding: 10px 18px 12px;
  }

  .header_title {
    display: none;
  }
  header {
    width: calc(100% - 40px);
    padding: 15px 20px;
  }
  header li {
    font-size: 0px;
    width: 14px;
    height: 21px;
  }
  header li::before
  {
    position: absolute;
    background-color: transparent;
    opacity: 0.4;
    width: 100%;
    height: 100%;
    left: 0px;
    top: 0px;
    background-image: inherit;
    background-size: 60% auto;
    background-position: center;
    background-repeat: no-repeat;
    z-index: 1;
    filter: invert(1);
  }
  .active::before {
    width: 100%;
    opacity: 0.8;
    margin-right: 0px;
  }
  .on_scroll header li::before
  {
    filter: invert(0);
  }
  
  .header_black .active::before {
    opacity: 1;
  }
  .on_scroll .header_black li::before
  {
    filter: invert(1);
  }
  
  .menu_home {
    background-image: url(../img/menu_home.png);
  }
  .menu_services {
    background-image: url(../img/menu_services.png);
  }
  .menu_products {
    background-image: url(../img/menu_products.png);
  }
  .menu_research {
    background-image: url(../img/Lambda.png);
  }
  .menu_contacts {
    background-image: url(../img/menu_contacts.png);
  }
  .active::after {
    background-color: rgb(239, 127, 26);
  }
  
  
  #home .section_inner::before {
    left: 0%;
    top: 0%;
    width: 100%;
    height: 100%;
    filter: blur(25vw) brightness(0.6);
  }
  

  h1 {
    font-size: 40px;
    margin-bottom: 30px;
  }
  h1 i {
    display: block;
    font-size: 0.3em;
  }
  

  .section_cell {
    display: block;
    width: auto;
    padding: 0px 0px 50px !important;
  }
  .section_table {
    display: block;
    padding-bottom: 0px;
  }
  

  .product_line {
    display: block;
  }
  .product_pic {
    display: block;
    width: auto;
    height: 180px;
    margin-bottom: 30px;
  }
  .product_pic_title {
    transform: rotate(0deg) translate(0%,50%);
    font-size: 12px;
    padding: 8px 15px;
  }
  .product_pic_title::before {
    width: 31px;
  }
  .product_description {
    display: block;
    text-align: left;
  }
  

  .window_block {
    margin: 15px;
    max-width: calc(100% - 30px);
  }
  .window_content iframe {
    width: 85vw;
    height: calc(100vh - 110px);
  }
  
  

  .footer_table {
    display: block;
  }
  .footer_cell {
    display: block;
  }
  footer ul {
    text-align: center;
    position: static;
  }
  .footer_copyright {
    text-align: center;
    padding-bottom: 40px;
    padding-top: 30px;
  }
  .footer_copyright::before {
    margin: 0px auto 10px;
  }
  header ul {
    right: 0px;
    position: absolute;
    top: -5px;
  }
  
  .product_line .features_line {
    margin: 0px;
  }
}


@media screen and (max-width: 900px)
{
  .contacts {
    display: block;
  }
  .contacts_block {
    display: inline-block;
    min-width: calc(220px + 4%);
    margin: 0px 10px 20px;
  }
}

@media screen and (max-width: 500px)
{
  .contacts {
    display: block;
  }
  .contacts_block {
    min-width: auto;
    margin: 0px 0px 20px;
    display: block;
    width: auto;
  }
}