body {
  font-family: Arial, sans-serif;
  background: #f0f2f5;
  display: flex;
  justify-content: center;
  padding: 40px;
}

.todo-container {
  background: white;
  padding: 20px;
  border-radius: 12px;
  width: 350px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  text-align: center;
}

h1 {
  margin-bottom: 20px;
}

.todo-input {
  display: flex;
  justify-content: center;
  margin-bottom: 15px;
}

.todo-input input {
  flex: 1;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 6px;
}

.todo-input button {
  padding: 10px;
  margin-left: 10px;
  background: #28a745;
  border: none;
  border-radius: 6px;
  color: white;
  cursor: pointer;
}

.filters {
  margin: 15px 0;
}

.filters button {
  margin: 0 5px;
  padding: 6px 12px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  background: #ddd;
}

.filters .active {
  background: #007bff;
  color: white;
}

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

li {
  background: #f9f9f9;
  padding: 10px;
  border-radius: 6px;
  margin-bottom: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

.delete-btn {
  background: #dc3545;
  border: none;
  padding: 6px;
  border-radius: 6px;
  color: white;
  cursor: pointer;
}