.marker {
      width: 18px;
      height: 18px;
      border-radius: 50%;
      background: #e74c3c;
      border: 2px solid #fff;
      box-shadow: 0 0 3px rgba(0,0,0,0.6);
      cursor: pointer;
    }

    /* Popup над маркером */
    #popup {
      background: white;
      padding: 4px 8px;
      border-radius: 4px;
      border: 1px solid #ccc;
      font-size: 12px;
      white-space: nowrap;
      position: relative;
    }
    #popup:after {
      content: "";
      position: absolute;
      left: 50%;
      bottom: -6px;
      transform: translateX(-50%);
      border-width: 6px 6px 0 6px;
      border-style: solid;
      border-color: #ccc transparent transparent transparent;
    }