body {
  font-family: Arial, sans-serif;
  background-color: #e6f0ff; /* pastel blue */
  color: #003366;
  margin: 0;
  padding: 0;
  text-align: center;
}

#app {
  padding: 20px;
}

#loginBtn {
  background-color: #99ccff;
  border: none;
  padding: 12px 20px;
  font-size: 16px;
  border-radius: 8px;
  cursor: pointer;
}

#trackInfo img {
  width: 200px;
  border-radius: 10px;
  margin: 10px 0;
}

#lyrics {
  margin-top: 20px;
  max-height: 300px;
  overflow-y: auto;
  background: #cce6ff;
  padding: 15px;
  border-radius: 10px;
  text-align: left;
  line-height: 1.5;
}

#progressContainer {
  width: 100%;
  background-color: #cce6ff;
  border-radius: 10px;
  margin-top: 10px;
  height: 20px;
}

#progressBar {
  height: 100%;
  width: 0%;
  background-color: #3399ff;
  border-radius: 10px;
  transition: width 0.5s linear;
}

/* Animation when song changes */
.fade {
  animation: fadeIn 1s ease-in-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

/* Highlight current lyric line */
.current-line {
  color: #000;
  font-weight: bold;
  background-color: #b3d9ff;
  transition: background-color 0.5s ease;
}