body {
  font-family: 'Segoe UI', sans-serif;
  background: linear-gradient(to right, #1f1c2c, #928dab);
  color: #fff;
  margin: 0;
  padding: 0;
}

.container {
  max-width: 600px;
  margin: 50px auto;
  background: rgba(255, 255, 255, 0.1);
  padding: 30px;
  border-radius: 15px;
  box-shadow: 0 0 20px rgba(255, 255, 255, 0.2);
}

h1 {
  text-align: center;
  margin-bottom: 20px;
}

.input-section input,
.input-section button {
  padding: 10px;
  margin: 5px;
  border: none;
  border-radius: 8px;
}

.input-section input {
  width: 60%;
}

.input-section button {
  background-color: #ff6f61;
  color: white;
  cursor: pointer;
}

.filter-section button {
  margin: 5px;
  padding: 8px 12px;
  background-color: #6a0572;
  border: none;
  border-radius: 8px;
  color: white;
  cursor: pointer;
}

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

li {
  background-color: rgba(255, 255, 255, 0.2);
  margin: 10px 0;
  padding: 10px;
  border-radius: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.completed {
  text-decoration: line-through;
  opacity: 0.6;
}