body {
  font-family: Arial, sans-serif;
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
  background-color: #3b3b3b;
}

header {
  text-align: center;
  margin-bottom: 30px;
  color: white;
}

section {
  background: white;
  padding: 20px;
  margin-bottom: 20px;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

h2 {
  color: #2c3e50;
  border-bottom: 2px solid #bc0f0f;
  padding-bottom: 5px;
}

form {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

form > div {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

label {
  font-weight: bold;
  color: #34495e;
}

input {
  padding: 8px 12px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 14px;
}

input:focus {
  outline: none;
  border-color: #bc0f0f;
  box-shadow: 0 0 5px rgba(52, 152, 219, 0.3);
}

button {
  padding: 10px 15px;
  background-color: #bc0f0f;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 14px;
  transition: background-color 0.3s;
  margin: 2px;
}

button:hover {
  background-color: #560000;
}

.book-item {
  border: 1px solid #ddd;
  padding: 15px;
  margin-bottom: 15px;
  border-radius: 6px;
  background-color: #fafafa;
}

.book-item h3 {
  margin: 0 0 10px 0;
  color: #2c3e50;
}

.book-item p {
  margin: 5px 0;
  color: #7f8c8d;
}

.book-item div {
  margin-top: 15px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.book-item button {
  padding: 6px 12px;
  font-size: 12px;
}

.book-item button:nth-child(1) {
  background-color: #209a53;
}

.book-item button:nth-child(1):hover {
  background-color: #1a7841;
}

.book-item button:nth-child(2) {
  background-color: #ca4435;
}

.book-item button:nth-child(2):hover {
  background-color: #b93425;
}

.book-item button:nth-child(3) {
  background-color: #f39c12;
}

.book-item button:nth-child(3):hover {
  background-color: #e67e22;
}

#searchBook {
  flex-direction: row;
  align-items: end;
  gap: 10px;
}

#searchBook > * {
  flex: 1;
}

#searchBook button {
  margin-top: 0;
}

.no-books {
  text-align: center;
  color: #7f8c8d;
  font-style: italic;
  padding: 20px;
}

.checkbox {
  display: inline;
}
