/* Styles for the Previous and Future Weeks dropdowns */
.previous-weeks details,
.future-weeks details {
  margin: 1em 0;
  border: 1px solid #e0e0e0;
  border-radius: 4px;
  overflow: hidden;
}

.previous-weeks summary,
.future-weeks summary {
  cursor: pointer;
  font-weight: bold;
  padding: 0.8em 1em;
  background-color: #f5f5f5;
  border-bottom: 1px solid #e0e0e0;
  transition: background-color 0.2s;
}

.previous-weeks summary:hover,
.future-weeks summary:hover {
  background-color: #e5e5e5;
}

.previous-weeks summary:focus,
.future-weeks summary:focus {
  outline: none;
}

.previous-weeks .week-list,
.future-weeks .week-list {
  list-style-type: none;
  padding: 0;
  margin: 0;
}

.previous-weeks .week-item,
.future-weeks .week-item {
  padding: 0.8em 1em;
  border-bottom: 1px solid #f0f0f0;
}

.previous-weeks .week-item:last-child,
.future-weeks .week-item:last-child {
  border-bottom: none;
}

.previous-weeks .week-link,
.future-weeks .week-link {
  font-weight: bold;
  text-decoration: none;
  color: #4a4a4a;
}

.previous-weeks .week-link:hover,
.future-weeks .week-link:hover {
  text-decoration: underline;
  color: #2a7ae2;
}

.current-week {
  margin-bottom: 2em;
  padding: 1em;
  background-color: #f9f9f9;
  border-left: 4px solid #2a7ae2;
  border-radius: 4px;
}

.current-week h3 {
  margin-top: 0;
  color: #2a7ae2;
}

.week-desc {
  margin-top: 0.5em;
  font-size: 0.95em;
} 
.concept-tooltip {
  border-bottom: 1px dotted #666;
  cursor: help;
}

.concept-index {
  list-style-type: none;
  padding: 0;
}

.concept-index li {
  margin-bottom: 10px;
  padding: 10px;
  border: 1px solid #eee;
  border-radius: 4px;
  cursor: help;
}

.concept-index li:hover {
  background-color: #f9f9f9;
}

.concept-number {
  display: inline-block;
  width: 30px;
  height: 30px;
  line-height: 30px;
  text-align: center;
  background-color: #4CAF50;
  color: white;
  border-radius: 50%;
  margin-right: 10px;
}

.week-text {
  font-weight: bold;
  color: #4a4a4a;
}