body {
  font-family: Arial, sans-serif;
  max-width: 900px;
  margin: 40px auto;
  padding: 20px;
}

button {
  padding: 10px 15px;
  margin: 5px;
  cursor: pointer;
}

input,
select {
  display: block;
  width: 320px;
  margin: 8px 0;
  padding: 8px;
}

.section {
  display: none;
  margin-top: 20px;
  padding: 20px;
  border: 1px solid #ccc;
}

.card {
  margin: 10px 0;
  padding: 12px;
  border: 1px solid #aaa;
}

.tabs {
  display: flex;
  gap: 10px;
  margin: 20px 0;
}

.tab-button {
  padding: 12px 18px;
  border: 1px solid #999;
  background: #f5f5f5;
  cursor: pointer;
}

.tab-button.active {
  background: #ddd;
  font-weight: bold;
}