.site-header {
    background-color: #ffffff;
    border-bottom: 1px solid #e5e5e5;
    padding: 0.75rem 1rem;
    position: sticky;
    top: 0;
    z-index: 100;
  }
  
  .header-inner {
    max-width: 100%;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
  }
  
  .header-logo img {
    height: 40px;
    display: block;
  }

  .header-title {
    font-weight: bold;
    font-size: 2rem;
    color: #333;
  }
  
  .lang-btn {
    text-decoration: none;
    color: #666666;
    padding: 0 0.5rem;
    position: relative;
    transition: color 0.2s ease;
  }
  
  .lang-btn:hover {
    color: #333333;
  }
  
  .lang-btn:not(:last-child)::after {
    content: '/';
    position: absolute;
    right: 0;
    color: #cccccc;
  }
  
  .lang-btn.active {
    color: #e31919;
    font-weight: 700;
  }

  @media (max-width: 500px) {
    .header-title {
      display: none;
    }
  }