.mobile-menu { display: none; }

@media (max-width: 900px) {
  nav { position: relative; }
  nav .nav-links { display: none; }
  .mobile-menu { display: block; font-family: var(--mono, monospace); }
  .mobile-menu summary {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 9px;
    min-width: 94px;
    min-height: 44px;
    padding: 8px 12px;
    border: 1px solid #514b63;
    border-radius: 3px;
    background: #25232c;
    color: #f3f5ef;
    cursor: pointer;
    font-size: 12px;
    list-style: none;
    text-transform: uppercase;
  }
  .mobile-menu summary::-webkit-details-marker { display: none; }
  .mobile-menu summary::marker { content: ""; }
  .mobile-menu summary:focus-visible,
  .mobile-menu-links a:focus-visible { outline: 3px solid #61d7ff; outline-offset: 3px; }
  .mobile-menu[open] summary { background: #302b3e; border-color: #bf8fff; }
  .mobile-menu .menu-icon { font-size: 21px; line-height: 1; }
  .mobile-menu .close-icon { display: none; }
  .mobile-menu[open] .open-icon { display: none; }
  .mobile-menu[open] .close-icon { display: inline; }
  .mobile-menu-links {
    position: absolute;
    z-index: 30;
    top: calc(100% + 1px);
    right: 0;
    width: min(320px, calc(100vw - 42px));
    max-height: 70vh;
    overflow-y: auto;
    padding: 9px;
    border: 1px solid #514b63;
    border-radius: 0 0 4px 4px;
    background: #202221;
    box-shadow: 0 16px 30px rgba(0, 0, 0, .35);
  }
  .mobile-menu-links a {
    display: flex;
    align-items: center;
    min-height: 44px;
    padding: 10px 13px;
    border-radius: 2px;
    color: #f3f5ef;
    font-size: 13px;
    text-decoration: none;
  }
  .mobile-menu-links a:hover { background: #302b3e; }
  .mobile-menu-links a[aria-current="page"] { color: #bf8fff; }
  .mobile-menu-links .contact {
    justify-content: center;
    margin-top: 8px;
    background: #ff6b8b;
    color: #171918;
    font-weight: 600;
  }
  .mobile-menu-links .contact:hover { background: #ff9eab; color: #171918; }
}