* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, #1db954, #191414);
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}

.container {
  background: rgba(0, 0, 0, 0.6);
  padding: 40px;
  border-radius: 20px;
  box-shadow: 0 20px 30px rgba(0, 0, 0, 0.5);
  text-align: center;
  width: 90%;
  max-width: 500px;
  animation: fadeIn 1s ease-in-out;
}

h1 {
  font-size: 2rem;
  margin-bottom: 20px;
  background: linear-gradient(90deg, #1db954, #ffffff);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

input[type="text"] {
  padding: 12px 16px;
  width: 100%;
  border: none;
  border-radius: 10px;
  font-size: 1rem;
  margin-bottom: 20px;
  outline: none;
  transition: box-shadow 0.3s ease;
}

input[type="text"]:focus {
  box-shadow: 0 0 10px #1db954;
}

button {
  background: #1db954;
  color: #fff;
  padding: 12px 24px;
  font-size: 1rem;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.3s ease, transform 0.2s ease;
}

button:hover {
  background: #17a74a;
  transform: scale(1.05);
}

#message {
  margin-top: 20px;
  font-size: 1rem;
  min-height: 24px;
  animation: slideUp 0.5s ease-in-out;
}

.loader {
  display: none;
  margin: 20px auto;
  border: 6px solid rgba(255, 255, 255, 0.2);
  border-top: 6px solid #1db954;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}