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

body {
  background: #f9f9f9;
  color: #333;
}

/* HEADER */
.header {
  background: #ffffff;
  text-align: center;
  padding: 30px 15px;
}

.header h1 {
  font-size: 26px;
}

.header p {
  margin: 10px 0;
  color: #666;
}

.btn {
  display: inline-block;
  margin-top: 15px;
  background: #28a745;
  color: #fff;
  padding: 12px 20px;
  border-radius: 6px;
  text-decoration: none;
}

/* FEATURES */
.features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  padding: 20px;
}

.feature {
  background: #fff;
  padding: 15px;
  border-radius: 8px;
  text-align: center;
  font-size: 14px;
}

/* BOOK SECTION */
.book-section {
  padding: 20px;
}

.book-section h2 {
  margin-bottom: 15px;
}

/* BOOK GRID */
.book-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 15px;
}

.book-card {
  background: #fff;
  border-radius: 10px;
  padding: 10px;
}

.book-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border-radius: 8px;
}

.book-card h3 {
  font-size: 15px;
  margin: 8px 0;
}

.price {
  font-weight: bold;
  color: #000;
}

.price span {
  color: #888;
  text-decoration: line-through;
  font-size: 12px;
  margin-left: 5px;
}

small {
  color: #777;
}

/* FOOTER */
footer {
  text-align: center;
  padding: 15px;
  background: #fff;
  margin-top: 20px;
}