* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Segoe UI", Arial, sans-serif;
  background-color: #f5f5f5;
  color: #333;
  line-height: 1.6;
}

header {
  background-color: #004aad;
  color: white;
  text-align: center;
  padding: 25px 0;
}

header h1 {
  font-size: 1.8em;
  margin-bottom: 5px;
}

nav {
  background-color: #007bff;
}

nav ul {
  list-style: none;
  display: flex;
  justify-content: center;
}

nav li {
  margin: 0 20px;
}

nav a {
  display: block;
  color: white;
  text-decoration: none;
  padding: 15px 10px;
  font-weight: bold;
}

nav a:hover {
  background-color: #005dc0;
  border-radius: 5px;
}

.search-area {
  background-color: #ffffff;
  text-align: center;
  padding: 30px;
  margin: 20px auto;
  width: 80%;
  border: 1px solid #ddd;
  border-radius: 10px;
}

.search-area h2 {
  color: #004aad;
  margin-bottom: 15px;
}

.search-area input[type="text"] {
  width: 60%;
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 5px;
  font-size: 1rem;
}

.search-area input[type="submit"] {
  padding: 10px 18px;
  background-color: #007bff;
  color: white;
  border: none;
  border-radius: 5px;
  margin-left: 8px;
  cursor: pointer;
}

.search-area input[type="submit"]:hover {
  background-color: #005dc0;
}

.intro {
  width: 80%;
  margin: 20px auto;
  background-color: white;
  padding: 25px;
  border-radius: 10px;
  border: 1px solid #ddd;
}

.intro h2 {
  color: #004aad;
  margin-bottom: 10px;
}

main {
  width: 80%;
  margin: 20px auto;
}

main h2 {
  text-align: center;
  color: #004aad;
  margin-bottom: 20px;
}

.book-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.book {
  background-color: white;
  border: 1px solid #ccc;
  border-radius: 10px;
  padding: 15px;
  text-align: center;
  transition: 0.3s;
}

.book:hover {
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
  transform: translateY(-3px);
}

.book img {
  width: 100%;
  border-radius: 5px;
  margin-bottom: 10px;
}

.book h3 {
  color: #007bff;
  margin-bottom: 10px;
}

.book p {
  color: #555;
}

footer {
  background-color: #004aad;
  color: white;
  text-align: center;
  padding: 20px 10px;
  font-size: 0.9rem;
  margin-top: 40px;
}