.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 10px;
  background: transparent;
  color: #fff;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}
.menu-toggle span,
.menu-toggle::before,
.menu-toggle::after {
  content: "";
  display: block;
  width: 21px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform 0.2s, opacity 0.2s;
}
.menu-toggle span { margin: 5px 0; }
.menu-toggle[aria-expanded="true"] span { opacity: 0; }
.menu-toggle[aria-expanded="true"]::before { transform: translateY(7px) rotate(45deg); }
.menu-toggle[aria-expanded="true"]::after { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 850px) {
  nav { position: relative; }
  .menu-toggle { display: block; }
  .navlinks {
    display: none;
    position: absolute;
    top: calc(100% + 1px);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px 14px 16px;
    background: rgba(6, 29, 46, 0.99);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 16px 28px rgba(0, 0, 0, 0.24);
  }
  .navlinks.open { display: flex; }
  .navlinks a,
  .navlinks a:not(.call) {
    display: block;
    padding: 14px 12px;
    opacity: 1;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }
  .navlinks .call {
    margin-top: 8px;
    padding: 12px 14px;
    text-align: center;
    border-bottom: 0;
    border-radius: 10px;
  }
}