body {
  font-family: "Segoe UI", sans-serif;

  /* background: #f5f7fa; */
  flex-direction: column;
  align-items: center;
  padding: 2rem;

  background: linear-gradient(-135deg, #daf0f1, #d58de4);

  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 0;
}

h1 {
  color: #333;
}

.task {
  background: #fff;
  padding: 1rem;
  margin-top: 1rem;
  border-radius: 10px;
  width: 300px;
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.completed {
  text-decoration: line-through;
  color: gray;
}

button {
  border: none;
  padding: 6px 10px;
  border-radius: 6px;
  background: #007bff;
  color: white;
  cursor: pointer;
}

button:disabled {
  background: #ccc;
  cursor: not-allowed;
}

#log {
  margin-top: 2rem;
  width: 320px;
  font-size: 0.9rem;
  color: #555;
  background: #eef;
  border-radius: 6px;
  padding: 1rem;
}