* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f5f5f5;
  color: #222;
}

.container {
  max-width: 720px;
  margin: 2rem auto;
  padding: 0 1rem;
}

.card {
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 1rem;
  margin-bottom: 1rem;
}

label {
  display: block;
  margin-bottom: 0.75rem;
}

input {
  width: 100%;
  padding: 0.5rem;
  margin-top: 0.25rem;
}

button {
  padding: 0.5rem 0.75rem;
  border: 1px solid #bbb;
  background: #fff;
  cursor: pointer;
}

button:hover {
  background: #f2f2f2;
}

.row {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.spread {
  justify-content: space-between;
}

.hidden {
  display: none;
}

#tasks-list {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
}

.task-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid #eee;
  padding: 0.6rem 0;
}

.done {
  text-decoration: line-through;
  color: #777;
}

#error,
.error {
  color: #b00020;
}