* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', sans-serif;
}

body {
  color: #333;
  line-height: 1.6;
}


.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 5%;
  background: #fff;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: #0066cc;
}

.nav a {
  margin: 0 10px;
  text-decoration: none;
  color: #333;
  font-weight: 500;
}

.nav a:hover {
  color: #0066cc;
}


.banner {
  background: linear-gradient(rgba(0,0,0,0.4), rgba(0,0,0,0.5)), 
              url('banner-books.jpg') center/cover no-repeat;
  color: white;
  text-align: center;
  padding: 100px 20px;
}

.banner-content h1 {
  font-size: 2.5rem;
  margin-bottom: 10px;
}

.banner-content p {
  font-size: 1.2rem;
  margin-bottom: 20px;
}

.btn {
  background: #ffcc00;
  color: #333;
  padding: 10px 20px;
  border-radius: 5px;
  text-decoration: none;
  font-weight: bold;
}

.btn:hover {
  background: #ffaa00;
}


.intro {
  text-align: center;
  padding: 50px 10%;
  background: #f9f9f9;
}

.intro h2 {
  color: #0066cc;
  margin-bottom: 20px;
}


.features {
  padding: 50px 10%;
}

.features h2 {
  text-align: center;
  color: #0066cc;
  margin-bottom: 40px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
}

.feature {
  background: #fff;
  border-radius: 10px;
  padding: 20px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  text-align: center;
  transition: transform 0.3s;
}

.feature:hover {
  transform: translateY(-5px);
}


.contact {
  background: #0066cc;
  color: white;
  text-align: center;
  padding: 50px 10%;
}

.contact a {
  color: #ffeb3b;
  text-decoration: none;
}

.contact a:hover {
  text-decoration: underline;
}


.footer {
  text-align: center;
  background: #003366;
  color: white;
  padding: 15px;
  font-size: 0.9rem;
}


@media (max-width: 768px) {
  .nav {
    display: none;
  }

  .banner-content h1 {
    font-size: 2rem;
  }

  .banner-content p {
    font-size: 1rem;
  }
}