/*
  ONTOP mobile header menu
  Add after the existing site CSS. Works with the current .header > .header__logo + nav markup.
*/

.header__menu-button {
  display: none;
}

@media (max-width: 768px) {
  .header {
    padding: 0 1.25em;
  }

  .header__logo {
    font-size: 0.88rem;
    letter-spacing: 0.08em;
  }

  .header__menu-button {
    position: relative;
    z-index: 102;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border: 1px solid rgba(255, 255, 255, 0.28);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.1);
    cursor: pointer;
  }

  .header__menu-button span,
  .header__menu-button::before,
  .header__menu-button::after {
    position: absolute;
    width: 18px;
    height: 2px;
    border-radius: 999px;
    background: #fff;
    content: '';
    transition: transform 0.2s ease, opacity 0.2s ease;
  }

  .header__menu-button::before {
    transform: translateY(-6px);
  }

  .header__menu-button::after {
    transform: translateY(6px);
  }

  .header__menu-button.is-open span {
    opacity: 0;
  }

  .header__menu-button.is-open::before {
    transform: rotate(45deg);
  }

  .header__menu-button.is-open::after {
    transform: rotate(-45deg);
  }

  .header nav {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    display: block;
    padding: 1em;
    background: rgba(13, 31, 53, 0.96);
    box-shadow: 0 18px 34px rgba(0, 0, 0, 0.22);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-10px);
    transition: opacity 0.2s ease, transform 0.2s ease;
  }

  .header nav.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .header nav ul {
    display: flex;
    flex-direction: column;
    gap: 0;
  }

  .header nav ul li + li {
    border-top: 1px solid rgba(255, 255, 255, 0.12);
  }

  .header nav ul li a {
    display: block;
    padding: 1em 0.2em;
    color: #fff;
    font-size: 0.95rem;
    opacity: 1;
  }
}