.filter-checkbox { display: none; }
.filter-labels { margin-bottom: 15px; }
.filter-labels label {
  display: inline-block;
  padding: 5px 12px;
  margin: 3px;
  border: 1px solid #ccc;
  border-radius: 4px;
  cursor: pointer;
  background: #f5f5f5;
}
.filter-labels label:hover { background: #e0e0e0; }
.filter-checkbox:checked + label {
  background: #007bff;
  color: white;
  border-color: #007bff;
}

/* Default: show all items */
.timeline-item { display: block; }

/* When any filter is active, hide all items by default */
#filter-star:checked ~ .timeline-content .timeline-item,
#filter-paper:checked ~ .timeline-content .timeline-item,
#filter-news:checked ~ .timeline-content .timeline-item,
#filter-podcast:checked ~ .timeline-content .timeline-item,
#filter-academia:checked ~ .timeline-content .timeline-item,
#filter-release:checked ~ .timeline-content .timeline-item,
#filter-tv:checked ~ .timeline-content .timeline-item { display: none; }

/* Show items matching active filters */
#filter-star:checked ~ .timeline-content .timeline-item.star { display: block; }
#filter-paper:checked ~ .timeline-content .timeline-item.paper { display: block; }
#filter-news:checked ~ .timeline-content .timeline-item.news { display: block; }
#filter-podcast:checked ~ .timeline-content .timeline-item.podcast { display: block; }
#filter-academia:checked ~ .timeline-content .timeline-item.academia { display: block; }
#filter-release:checked ~ .timeline-content .timeline-item.release { display: block; }