* { margin: 0; padding: 0; box-sizing: border-box; font-family: Arial, sans-serif; }
body {
  transition: background 0.5s;
  display: flex; justify-content: center; align-items: center; min-height: 100vh;
}
.container {
  width: 400px;
  background: rgba(0,0,0,0.8);
  padding: 20px;
  border-radius: 15px;
  color: #fff;
}
header h1 { text-align: center; margin-bottom: 15px; }
.current-track { text-align: center; margin-bottom: 15px; }
.current-track img { width: 150px; height: 150px; border-radius: 50%; margin-bottom: 10px; transition: transform 1s linear; }
.current-track img.playing { animation: spin 5s linear infinite; }
@keyframes spin { 100% { transform: rotate(360deg); } }

.playlist { list-style: none; max-height: 150px; overflow-y: auto; margin-bottom: 15px; }
.playlist li { padding: 8px; border-bottom: 1px solid rgba(255,255,255,0.1); cursor: pointer; }
.playlist li:hover { background: rgba(255,255,255,0.1); }

.controls { display: flex; justify-content: space-between; margin-bottom: 15px; }
.controls button { background: transparent; border: none; color: #fff; font-size: 1.2rem; cursor: pointer; }

.progress-container { display: flex; align-items: center; gap: 10px; }
#progress { flex: 1; cursor: pointer; }