body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 0;
  background-color: #2c3e50; /* Dark blue/gray background */
  color: #ecf0f1; /* Light text */
}

.container {
  max-width: 900px;
  margin: 40px auto;
  padding: 25px;
  background-color: #34495e; /* Slightly lighter dark blue/gray */
  border-radius: 8px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2); /* Darker shadow */
}

h1,
h2 {
  color: #ecf0f1; /* Light text for headers */
  text-align: center;
  margin-bottom: 25px;
}

.form-group {
  margin-bottom: 25px;
  text-align: center;
}

label {
  display: block;
  font-weight: bold;
  margin-bottom: 8px;
  color: #bdc3c7; /* Lighter gray for labels */
}

select {
  width: 100%;
  max-width: 400px;
  padding: 12px 15px;
  border: 1px solid #5d7c99; /* Darker blue border */
  border-radius: 6px;
  background-color: #49637e; /* Darker blue for select background */
  color: #ecf0f1; /* Light text */
  font-size: 1rem;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
  appearance: none; /* Remove default arrow */
  -webkit-appearance: none;
  -moz-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23bdc3c7'%3E%3Cpath d='M7 10l5 5 5-5z'/%3E%3C/svg%3E"); /* Light arrow */
  background-repeat: no-repeat;
  background-position: right 15px center;
  background-size: 16px;
  cursor: pointer;
  transition: border-color 0.2s, box-shadow 0.2s, background-color 0.2s;
}

select:focus {
  border-color: #00aaff; /* Bright blue on focus */
  outline: none;
  box-shadow: 0 0 0 3px rgba(0, 170, 255, 0.25); /* Glow effect */
}

select:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  background-color: #3e566f; /* Slightly lighter disabled background */
  color: #aeb5bb; /* Slightly darker disabled text */
}

#songs-list-container {
  margin-top: 30px;
  border-top: 1px solid #506f8c; /* Darker line */
  padding-top: 20px;
}

#songs-list ul {
  list-style: none;
  padding: 0;
}

#songs-list li {
  background-color: #3f5a72; /* Slightly lighter dark blue/gray for list items */
  border: 1px solid #506f8c; /* Darker border */
  border-radius: 6px;
  margin-bottom: 10px;
  padding: 15px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s ease-in-out, background-color 0.2s, border-color 0.2s;
}

#songs-list li:hover {
  transform: translateY(-3px);
  background-color: #49637e; /* Slightly brighter on hover */
  border-color: #6080a0;
}

#songs-list .song-title {
  font-weight: bold;
  color: #ecf0f1; /* Light text for song title */
  font-size: 1.1rem;
}

#songs-list .last-played {
  font-size: 0.9em;
  color: #e0e0e0; /* Light gray for date text */
  background-color: #55728f; /* Darker blue accent for date background */
  padding: 5px 10px;
  border-radius: 4px;
}

#loading-spinner {
  text-align: center;
  font-style: italic;
  color: #bdc3c7; /* Lighter gray for spinner text */
  margin-top: 20px;
}

.hidden {
  display: none;
}