body {
  font-family: 'Segoe UI', sans-serif;
  background: linear-gradient(to right, #74ebd5, #ACB6E5);
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
  animation: fadeIn 1s ease-in-out;
}

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

.container {
  background: white;
  padding: 30px;
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
  text-align: center;
  width: 90%;
  max-width: 400px;
}

h1 {
  color: #333;
  margin-bottom: 10px;
}

ul {
  list-style: none;
  padding: 0;
  margin: 20px 0;
}

li {
  background-color: #007bff;
  color: white;
  padding: 15px;
  border-radius: 10px;
  margin-bottom: 10px;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
}

li:hover {
  background-color: #0056b3;
  transform: scale(1.03);
}

li.completed {
  background-color: #28a745 !important;
  opacity: 0.6;
  pointer-events: none;
}

.cooldown {
  font-size: 13px;
  margin-top: 6px;
  color: #ffc107;
}

button {
  display: none;
  margin-top: 20px;
  padding: 12px 25px;
  background-color: #28a745;
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  cursor: pointer;
  transition: transform 0.3s;
}

button:hover {
  transform: scale(1.05);
}