/* File: /styles/decodable.css */

/* === General Containers === */
.decodable-index,
.decodable-prelearning,
.decodable-menu,
.decodable-video,
.decodable-read {
  margin: 2rem auto;
  max-width: 900px;
}

.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
}

/* === Learn-Style Header === */
.learn-header {
  background: var(--color-secondary);
}

/* === Main Nav Active Button Bubble === */
.main-nav a.active {
  background: var(--color-primary);
  color: #fff;
  border-radius: 20px;
  padding: 0.5rem 1rem;
}

/* === Page Header === */
.page-header {
  margin: 2rem 0;
}
.page-header h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}
.page-header p {
  font-size: 1rem;
  color: var(--text-dark);
}

/* === Book Grid === */
.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1.5rem;
}
.book-card {
  background: #fff;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform 0.2s;
  text-align: center;
  padding: 1rem;
}
.book-card:hover {
  transform: translateY(-5px);
}
.book-card img {
  display: block;
  max-width: 150px;
  margin: 0 auto 1rem;
  height: auto;
}
.book-card h2 {
  margin: 0;
  font-size: 1.2rem;
  color: var(--text-dark);
}

/* === Other Sections (unchanged) === */
/* ... existing rules ... */