@media (max-width: 991px) {
  #siteHeader { position: relative; z-index: 1000; }
  #siteHeader .header-container { position: relative; }
  #mobileNavToggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: auto;
    min-width: 76px;
    min-height: 42px;
    padding: 8px 12px;
    border: 1px solid #508a4f;
    border-radius: 10px;
    background: #fff;
    color: #275335;
    font-size: 14px;
    font-weight: 600;
    line-height: 1.2;
    cursor: pointer;
  }
  #mobileNavToggle::after {
    content: '';
    display: block;
    width: 6px;
    height: 6px;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: rotate(45deg) translateY(-2px);
    transition: transform .2s ease;
  }
  #mobileNavToggle[aria-expanded="true"]::after {
    transform: rotate(225deg) translateY(-2px);
  }
  #mobileNavToggle:focus-visible {
    outline: 3px solid #d4ad58;
    outline-offset: 2px;
  }
  #mainNav {
    display: none !important;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 1001;
    width: 100%;
    max-height: min(70vh, 540px);
    overflow-x: hidden;
    overflow-y: auto;
    padding: 8px 14px 16px;
    background: #fff;
    border-top: 1px solid #e3eadf;
    box-shadow: 0 14px 25px rgba(22, 52, 29, .2);
  }
  #mainNav.nav-open { display: block !important; }
  #mainNav .nav-list {
    display: flex !important;
    flex-direction: column !important;
    align-items: stretch !important;
    width: 100%;
    height: auto !important;
    margin: 0;
    padding: 0;
    gap: 0 !important;
    list-style: none;
  }
  #mainNav .nav-item { display: block; width: 100%; height: auto; margin: 0; }
  #mainNav .nav-link {
    display: block;
    width: 100%;
    height: auto;
    padding: 13px 10px;
    line-height: 1.4;
    white-space: normal;
    border-bottom: 1px solid #e9eee7;
  }
  #mainNav .header-contact-group {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    width: 100%;
    margin-top: 12px;
  }
  #mainNav .header-phone-link,
  #mainNav .whatsapp-btn {
    display: flex;
    align-items: center;
    width: 100%;
    min-height: 42px;
    padding: 9px 10px;
    white-space: normal;
  }
}