@media (max-width: 900px) {
  body.nav-open {
    overflow: hidden;
  }
  body.nav-open .main-nav {
    position: fixed;
    z-index: 4;
    inset: 72px 0 auto;
    display: flex;
    flex-direction: column;
    gap: 0;
    margin: 0;
    padding: 14px 20px 22px;
    background: #121416;
    border-top: 1px solid #3c4244;
    box-shadow: 0 18px 35px rgba(0, 0, 0, 0.25);
  }
  body.nav-open .main-nav a {
    padding: 14px 0;
    border-bottom: 1px solid #2f3537;
    color: #f8f7f3;
    font-size: 16px;
  }
  body.nav-open .menu-toggle {
    position: relative;
    z-index: 5;
  }
  body.nav-open .menu-toggle i:first-child {
    transform: translateY(3px) rotate(45deg);
  }
  body.nav-open .menu-toggle i:last-child {
    transform: translateY(-3px) rotate(-45deg);
  }
}