body {
  margin: 0;
  font-family: Arial;
  background: #000;
  color: white;
}

.app {
  display: flex;
  height: calc(100vh - 90px);
}

/* SIDEBAR */
.sidebar {
  width: 240px;
  background: #0b0b0b;
  padding: 20px;
  border-right: 1px solid #222;
}

.sidebar h1 {
  font-size: 18px;
  color: #1db954;
}

.sidebar button {
  display: block;
  width: 100%;
  margin: 10px 0;
  padding: 10px;
  background: transparent;
  border: none;
  color: white;
  text-align: left;
  cursor: pointer;
}

.sidebar button:hover {
  background: #1a1a1a;
  border-radius: 6px;
}

/* MAIN */
.main {
  flex: 1;
  padding: 20px;
  background: linear-gradient(#111, #000);
}

.tracks {
  margin-top: 20px;
}

.track {
  padding: 10px;
  background: #111;
  margin-bottom: 10px;
  border-radius: 6px;
  cursor: pointer;
}

.track:hover {
  background: #222;
}

/* PLAYER */
.player {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 90px;
  background: #121212;
  border-top: 1px solid #222;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
}

.controls button {
  background: #1db954;
  border: none;
  padding: 10px 15px;
  border-radius: 50px;
  margin: 0 5px;
  cursor: pointer;
}