@media (max-width: 767px) {

  .header-nav {
    position: relative;
    z-index: 100;
  }

  /* hamburger */
  .mobile-open-btn {
    width: 30px;
    height:20px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    cursor: pointer;
    z-index: 100;
  }
  .mobile-open-btn span {
    display: block;
    width: 100%;
    height: 3px;
    background: #fff;
    border-radius: 2px;
    transition: 0.3s;
  }

  /* slide‑in menu */
  .navigation {
    position: fixed;
    top: 0; right: 0;
    width: 75%;
    max-width: 300px;
    height: 100%;
    background: #000;
    transform: translateX(100%);
    transition: transform 0.4s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem 1rem;
    box-sizing: border-box;
    z-index: 101;
  }
  .navigation.active {
    transform: translateX(0);
  }
  .navigation li {
    list-style: none;
    margin: 1.2rem 0;
  }
  .navigation li a {
    color: #fff;
    font-size: 1.2rem;
    text-decoration: none;
    transition: color 0.2s;
  }
  .navigation li a:hover {
    color: #ddd;
  }

  /* close “X” */
  .mobile-close-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 28px;
    height: 28px;
    display: none;
    cursor: pointer;
    z-index: 103;
  }
  .mobile-close-btn.dblock {
    display: block;
  }
  .mobile-close-btn span {
    position: absolute;
    top: 50%; left: 50%;
    width: 28px; height: 3px;
    background: #fff;
    border-radius: 2px;
    transform-origin: center;
  }
  /* make an “X” */
  .mobile-close-btn span:nth-child(1) {
    transform: translate(-50%, -50%) rotate(45deg);
  }
  .mobile-close-btn span:nth-child(2) {
    transform: translate(-50%, -50%) rotate(-45deg);
  }
}



/* --- Mobile responsive Button close --- */