.content {
  padding: 30px;
  width: 100%;
}

/* Heading */
.heading-container {
  background-color: #000000;
  padding: 20px;
  border-radius: 12px;
  margin-bottom: 20px;
  color: #facc15;
  text-align: center;
}

/* Chapters */
.chapters-container {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.chapter {
  border-radius: 12px;
  overflow: hidden;
}

/* Toggle button */
.chapter-toggle {
  width: 100%;
  padding: 15px;
  font-size: 1.2rem;
  font-weight: bold;
  border: none;
  outline: none;
  cursor: pointer;
  background: inherit;
  color: inherit;
  text-align: left;
}

/* Content hidden by default */
.chapter-content {
  display: none;
  background: rgba(0,0,0,0.2);
  padding: 10px 20px;
}

.chapter-content ul {
  margin: 0;
  padding-left: 20px;
  list-style: none;
}

.chapter-content li {
  margin: 8px 0;
  border: none;
  color: white;
  font-size: 1rem;
  border-radius: 8px;
  width: 100%;
}

.chapter-content li a {
  text-decoration: none;
  color: inherit;
  display: block;
  height: 60px;
  display: flex;
  align-items: center;
  padding-left: 20px;
}

.pawn-chapter-header li { background-color: #3b82f6; }
.pawn-chapter-header li:hover { background-color: #3b83f67d; }

.knight-chapter-header li { background-color: #8b5cf6; } 
.knight-chapter-header li:hover { background-color: #8a5cf67d; } 

.bishop-chapter-header li { background-color: #ef4444; }
.bishop-chapter-header li:hover { background-color: #ef44447d; }

.rook-chapter-header li { background-color: #10b981; }
.rook-chapter-header li:hover { background-color: #10b9817d; }

.queen-chapter-header li { background-color: #facc15; color: black; }
.queen-chapter-header li:hover { background-color: #facc157d; color: black; }


.king-chapter-header li { background-color: #f97316; }
.king-chapter-header li:hover { background-color: #f973167d; }

.pawn-chapter-header { background-color: #3b82f6; color: white; }
.knight-chapter-header { background-color: #8b5cf6; color: white; }
.bishop-chapter-header { background-color: #ef4444; color: white; }
.rook-chapter-header { background-color: #10b981; color: white; }
.queen-chapter-header { background-color: #facc15; color: black; }
.king-chapter-header { background-color: #f97316; color: white; }