Hey there, orchid roots you have showing here on top look healthy. I don't worry when those roots turn slightly brown (as long as they are still firm you are ok). Be careful with your watering habits using that much moss as over watering will rot your roots towards the bottom of your pot. Water only when that moss is "crunchy." Since you have a clear plastic pot, utilize the benefits and wait until the roots turn white when viewing from the side. If the roots have green in them still, wait another day or two and check again. Leaves looks firm, green and upright which is a good sign. Just don't over water moving forward and you'll be in good shape. If you really feel motivated, you can unpot, inspect the roots and pot in more of a bark mix if you are one those people that like to water your plants. Post pics of more of the roots for a better idea of the plant's vitality.

Good luck!