.exercise {
  background: #f8f9fa;
  padding: 20px;
  border-radius: 8px;
  margin: 20px 0;
  border-left: 4px solid #007bff;
}

.exercise h3 {
  margin-top: 0;
}

.exercise.bonus {
  border-left-color: #ffc107;
  background: #fffef0;
}

.difficulty {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 0.8em;
  font-weight: bold;
  margin-bottom: 10px;
}

.difficulty.easy {
  background: #d4edda;
  color: #155724;
}

.difficulty.medium {
  background: #fff3cd;
  color: #856404;
}

.difficulty.hard {
  background: #f8d7da;
  color: #721c24;
}

.task-list {
  background: white;
  padding: 15px;
  border-radius: 5px;
  margin: 10px 0;
}

.task-list label {
  display: block;
  padding: 6px 0;
  cursor: pointer;
  border-bottom: 1px solid #f0f0f0;
}

.task-list label:last-child {
  border-bottom: none;
}

.task-list label:hover {
  background: #f0f8ff;
}

.task-list input[type="checkbox"] {
  margin-right: 10px;
  transform: scale(1.2);
}

.task-list label:has(input:checked) {
  text-decoration: line-through;
  opacity: 0.6;
}

.demo-area {
  background: white;
  padding: 15px;
  border-radius: 5px;
  margin: 15px 0;
  border: 1px solid #ddd;
}

.demo-area input[type="text"] {
  padding: 8px 12px;
  border: 1px solid #ccc;
  border-radius: 4px;
  width: 250px;
  font-size: 14px;
}

.demo-area select {
  padding: 8px 12px;
  border: 1px solid #ccc;
  border-radius: 4px;
  font-size: 14px;
}

.btn {
  padding: 8px 18px;
  margin: 4px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-size: 14px;
  color: white;
  transition: opacity 0.2s;
}

.btn:hover {
  opacity: 0.85;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: #007bff;
}

.btn-secondary {
  background: #6c757d;
}

.btn-danger {
  background: #dc3545;
}

.btn-warning {
  background: #ffc107;
  color: #333;
}

.mini-log {
  background: #1a1a2e;
  color: #0f0;
  padding: 10px;
  border-radius: 5px;
  font-family: "Cascadia Code", "Fira Code", "Consolas", monospace;
  font-size: 12px;
  max-height: 150px;
  overflow-y: auto;
  margin-top: 10px;
  min-height: 40px;
  white-space: pre-wrap;
  word-break: break-all;
}

.mini-log:empty::before {
  content: "Waiting for events...";
  color: #555;
  font-style: italic;
}

.info-box {
  background: #e7f3ff;
  padding: 15px 20px;
  border-radius: 8px;
  margin: 15px 0;
  border-left: 4px solid #0056b3;
}

.info-box h3 {
  margin-top: 0;
}

.hint, .answer {
  margin: 10px 0;
  border-radius: 5px;
}

.hint summary, .answer summary {
  cursor: pointer;
  padding: 8px 12px;
  border-radius: 5px;
  font-weight: bold;
}

.hint summary {
  background: #fff3cd;
  color: #856404;
}

.answer summary {
  background: #d4edda;
  color: #155724;
}

.hint > p, .answer > p {
  padding: 10px 12px;
  margin: 0;
}

.status-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 12px;
  font-size: 0.85em;
  font-weight: bold;
  background: #e2e3e5;
  color: #383d41;
  vertical-align: middle;
  margin-left: 8px;
}

.status-badge.granted {
  background: #d4edda;
  color: #155724;
}

.status-badge.denied {
  background: #f8d7da;
  color: #721c24;
}

.subscription-box {
  background: #f8f9fa;
  padding: 10px;
  border-radius: 5px;
  border: 1px solid #ddd;
  font-family: monospace;
  font-size: 11px;
  word-break: break-all;
  max-height: 100px;
  overflow-y: auto;
  margin: 10px 0;
}

.spec-link {
  display: inline-block;
  padding: 8px 14px;
  margin: 4px;
  background: #fd7e14;
  color: white;
  border-radius: 5px;
  text-decoration: none;
  transition: opacity 0.2s;
}

.spec-link:hover {
  opacity: 0.8;
}

.tips {
  background: #f0fff0;
  padding: 15px 20px;
  border-radius: 8px;
  margin: 20px 0;
  border-left: 4px solid #28a745;
}

.tips h3 {
  margin-top: 0;
}

.tips li {
  margin: 6px 0;
}