body {
  margin: 0;
  font-family: "Segoe UI", sans-serif;
  background-color: #f7f8fa;
  color: #333;
}

header {
  background: #2c3e50;
  padding: 15px 0;
}
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 85%;
  margin: auto;
  height: 80px;
  font-size: large;
}
.logo {
  color: #fff;
  font-size: 1.5em;
}
.nav-links {
  list-style: none;
  display: flex;
  gap: 20px;
}
.nav-links a {
  color: #fff;
  text-decoration: none;
  font-weight: 500;
  transition: 0.3s;
}
.nav-links a:hover,
.nav-links a.active {
  color: #f1c40f;
}

.hero {
  background: linear-gradient(to right, #0059ff, #00aaff);
  color: white;
  text-align: center;
  padding: 60px 20px;
}

.book-section {
  padding: 40px 20px;
  background: white;
  margin: 20px auto;
  width: 90%;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

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

.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
}

.book-card {
  background-color: #f9f9f9;
  border-radius: 8px;
  padding: 20px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
  text-align: center;
}

.book-card h3 {
  color: #004aad;
  margin-bottom: 10px;
}

.book-card a {
  display: inline-block;
  background-color: #004aad;
  color: white;
  text-decoration: none;
  padding: 8px 15px;
  border-radius: 5px;
  margin-top: 10px;
  transition: background 0.3s;
}

.book-card a:hover {
  background-color: #0073e6;
}

.contact {
  text-align: center;
  padding: 40px 20px;
}

footer {
  background: #2c3e50;
  color: white;
  text-align: center;
  padding: 15px 0;
  font-size: 0.9em;
}