.video-responsive {
    overflow: hidden;
    padding-bottom: 56.25%;
    position: relative;
    height: 0;
}
.video-responsive iframe {
    left: 0;
    top: 0;
    height: 100%;
    width: 100%;
    position: absolute;
}

 /* Base style for emphasized chapter headings */
h4.chapter-title {
  position: relative;
  font-weight: bold;
  margin-top: 3rem;       /* same as mt-5 in Bootstrap */
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Default underline */
h4.chapter-title::after {
  content: "";
  display: block;
  width: 72px;           /* 20% longer than original 60px */
  height: 3px;
  background: #6c757d;   /* neutral gray fallback */
  margin-top: 6px;
}

/* Color variants */
h4.chapter-description::after {
  background: #17a2b8; /* cyan/teal */
}

h4.chapter-production::after {
  background: #ffc107; /* yellow */
}

h4.chapter-musicians::after {
  background: #007bff; /* blue */
}

h4.chapter-tracklist::after {
  background: #28a745; /* green */
}

h4.chapter-photos::after {
  background: #dc3545; /* red */
}

h4.chapter-credits::after {
  background: #6f42c1; /* purple */
}

.list-group-numbered {
  counter-reset: section;
}
.list-group-numbered .list-group-item {
  counter-increment: section;
}
.list-group-numbered .list-group-item::before {
  content: counters(section,".") ". ";
  font-weight: bold;
  margin-right: 8px;
}