details {
  margin: 16px 0;
  border: 1px solid #ccc;
  border-radius: 6px;
  padding: 10px 14px;
  background: #b0b090 ;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

details summary {
  font-size: 1.3em;
  font-weight: bold;
  cursor: pointer;
  padding: 6px 0;
}

details summary::-webkit-details-marker {
  display: none;
}

.file-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px 12px;
}
.file-list a {
  display: block;
}

.file-list a:hover {
  background-color: #cdcdb4;
  border-radius:10px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08)
}

.year {
  grid-column: 1 / -1;   /* span full width */
  font-weight: bold;
  margin-top: 20px;
  margin-bottom: 6px;
}
.file-list p {
  margin: 0;
  padding: 0;
  display: block;
}
.file-list p:hover {
  background-color: #cdcdb4;
  border-radius:10px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08)
}