/* Style for collapsible year headers */
.collapsible-header {
  cursor: pointer;
  padding: 10px;
  background-color: #f1f1f1; /* Light gray background */
  border: 1px solid #ddd;
  margin-top: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between; /* Space out title and icon */
}

/* Style for the collapse icon */
.collapse-icon {
  margin-left: 10px;
  transition: transform 0.3s ease; /* Smooth rotation */
}

/* Rotate icon when header is active (content is open) */
.collapsible-header.active .collapse-icon {
  transform: rotate(180deg); /* Rotate arrow up */
}

/* Default state: content is hidden by JavaScript */
.collapsible-content {
  display: none;
  border: 1px solid #eee;
  border-top: none; /* No double border with header */
  padding: 10px;
  background-color: #fff; /* White background for content */
}