body {
  font-family: 'Segoe UI', sans-serif;
  background-color: #f4f4f4;
  margin: 0;
  padding: 20px;
}

.container {
  max-width: 500px;
  margin: auto;
  background: white;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

h1 {
  text-align: center;
}

.input-section {
  display: flex;
  gap: 10px;
  margin-bottom: 15px;
}

input, select {
  flex: 1;
  padding: 8px;
}

button {
  padding: 8px 12px;
  cursor: pointer;
}

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

li {
  display: flex;
  justify-content: space-between;
  padding: 10px;
  border-bottom: 1px solid #ccc;
}

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