* {
  box-sizing: border-box;
}
body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background: #fff;
  color: #333;
}
header {
  background: #23395B;
  color: white;
  padding: 20px;
  position: sticky;
  top: 0;
  z-index: 1000;
}
header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
nav a {
  color: white;
  margin-left: 15px;
  text-decoration: none;
}
nav select {
  margin-left: 20px;
  padding: 5px;
}
.hero {
  background: url('../assets/hero.jpg') center/cover no-repeat;
  color: white;
  padding: 100px 20px;
  text-align: center;
}
.button {
  background: #23395B;
  color: white;
  padding: 10px 20px;
  text-decoration: none;
  display: inline-block;
}
.section {
  padding: 60px 40px;
  max-width: 1000px;
  margin: auto;
}
.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}
.book {
  border: 1px solid #ddd;
  padding: 20px;
  text-align: center;
}
.book img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}
.book button {
  margin-top: 10px;
  background: #23395B;
  color: white;
  padding: 8px 12px;
  border: none;
}
.testimonial {
  background: #f4f4f4;
  padding: 20px;
  margin-bottom: 10px;
  border-left: 5px solid #23395B;
}
form {
  display: flex;
  flex-direction: column;
  max-width: 400px;
  margin: auto;
}
form input, form textarea {
  margin-bottom: 15px;
  padding: 10px;
  font-size: 1em;
}
form button {
  background: #23395B;
  color: white;
  border: none;
  padding: 10px;
}
footer {
  background: #23395B;
  color: white;
  text-align: center;
  padding: 20px;
}