header {
      position: fixed;
      top: 20px;
      left: 50%;
      transform: translateX(-50%) translateY(0);
      background: rgba(var(--background-color-rgb), 0.7);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      padding: 12px 30px;
      border-radius: 50px;
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      gap: 20px;
      z-index: 1000;
      transition: transform 0.3s ease, opacity 0.3s ease, background 0.3s ease;
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  }

  header.hidden {
      transform: translateX(-50%) translateY(-100px);
      opacity: 0;
      pointer-events: none;
  }

  .control-btn {
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 50%;
      transition: background 0.2s ease;
      color: var(--text-color);
  }

  .control-btn:hover {
      background: rgba(128, 128, 128, 0.2);
  }

  .control-btn svg {
      width: 20px;
      height: 20px;
  }

  #langSelect {
      background: transparent;
      border: 1px solid var(--border-color);
      color: var(--text-color);
      padding: 6px 12px;
      border-radius: 20px;
      font-size: 14px;
      cursor: pointer;
      transition: all 0.2s ease;
      outline: none;
  }

  #langSelect:hover {
      border-color: var(--text-color);
  }

  #langSelect option {
      background: var(--bg-color);
      color: var(--text-color);
  }

  @media screen and (max-width: 250px) {
      header {
          padding: 6px 15px;
      }

      .control-btn svg {
          width: 16px;
          height: 16px;
      }

      #langSelect {
          font-size: 12px;
      }
  }