:root {
  font-family: "Noto Sans TC", sans-serif;
}

body {
  margin: 0;
  background: linear-gradient(160deg, #f4f7ff 0%, #e8f4ff 100%);
}

.page {
  max-width: 640px;
  margin: 48px auto;
  padding: 24px;
  background: #fff;
  border: 1px solid #d8e4f5;
  border-radius: 12px;
}

h1 {
  margin: 0;
}

.hint {
  color: #4f5f77;
  margin: 8px 0 20px;
}

.todo-form {
  display: flex;
  gap: 8px;
}

.todo-form input {
  flex: 1;
  border: 1px solid #b8c9e5;
  border-radius: 8px;
  padding: 10px;
}

.todo-form button {
  border: 0;
  border-radius: 8px;
  padding: 10px 14px;
  background: #0f5bd8;
  color: #fff;
}

.error {
  color: #b00020;
}

.todo-list {
  margin: 16px 0 0;
  padding-left: 20px;
}