body {
  font-family: Arial, sans-serif;
  background-color: #f3f4f6;
  margin: 0;
  padding: 20px;
}
.container {
  max-width: 800px;
  margin: auto;
  background: white;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
h1 {
  text-align: center;
  margin-bottom: 30px;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  gap: 10px;
  margin-bottom: 20px;
}
.timeline-btn {
  padding: 10px;
  background-color: #e5e7eb;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-weight: bold;
  transition: background-color 0.3s;
}
.timeline-btn:hover, .timeline-btn.active {
  background-color: #2563eb;
  color: white;
}
.details {
  text-align: center;
}
#eventImage {
  max-width: 100%;
  height: auto;
  margin-top: 20px;
  border-radius: 8px;
}
.hidden {
  display: none;
}