/* Navigation buttons */
.chapter-navigation {
  position: relative;
  width: 100%;
  margin-top: 2rem;
}

.prev-btn {
  position: absolute;
  left: 0;
  font-size: 0.85rem;
  padding: 6px 12px;
  background-color: #00695c;
  color: #ffd700;
  border-radius: 6px;
  transition: all 0.3s ease;
}
.prev-btn:hover {
  background-color: #ffd700;
  color: #000000;
}

.next-btn {
  position: absolute;
  right: 0;
  font-size: 0.85rem;
  padding: 6px 12px;
  background-color: #00695c;
  color: #ffd700;
  border-radius: 6px;
  transition: all 0.3s ease;
}
.next-btn:hover {
  background-color: #ffd700;
  color: #000000;
}

.overview-container {
  clear: both;
  text-align: center;
  margin-top: 3rem;
}

.overview-btn {
  display: inline-block;
  width: 70%;
  padding: 10px 20px;
  background-color: #00695c;
  color: #ffd700;
  font-weight: 600;
  border-radius: 8px;
  transition: all 0.3s ease;
}
.overview-btn:hover {
  background-color: #ffd700;
  color: #000000;
  box-shadow: 0 0 10px rgba(0,0,0,0.3);
}

.navbar-brand {
  display: flex;
  flex-direction: column;   /* stack items vertically */
  align-items: flex-start;  /* align text to the left */
  line-height: 1.2;
}

.navbar-brand .brand-title {
  font-size: 1.25rem;       /* larger for main name */
  font-weight: 700;
}

.navbar-brand .brand-subtitle {
  font-size: 0.9rem;        /* smaller subtitle */
  font-weight: 400;
  opacity: 0.85;            /* subtle contrast */
}