body {
  background-color: #111;
  color: #fff;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  margin: 0;
  padding: 20px;
  line-height: 1.6;
}

h1 {
  text-align: center;
  font-size: 2.5em;
  margin-bottom: 40px;
  color: #ff4081;
}

#timeline {
  max-width: 800px;
  margin: 0 auto;
  padding: 1rem;
}

.year {
  font-size: 2rem;
  font-weight: bold;
  margin-top: 3rem;
  margin-bottom: 1rem;
  color: #00ffff;
  border-bottom: 2px solid #444;
  padding-bottom: 0.5rem;
}

.event {
  background-color: #1e1e1e;
  margin-bottom: 2rem;
  padding: 1rem;
  border-radius: 10px;
  box-shadow: 0 4px 10px rgba(0, 255, 255, 0.2);
  opacity: 0;
  transform: translateY(50px);
  transition: all 0.6s ease;
  color: #fff;
}

.event.visible {
  opacity: 1;
  transform: translateY(0);
}

.date {
  font-size: 1.2rem;
  font-weight: bold;
  color: #ff69b4;
  margin-bottom: 0.5rem;
}

.content h3 {
  font-size: 1.3rem;
  margin: 0.5rem 0;
  color: #fff;
}

.content h4 {
  font-size: 1.1rem;
  margin: 0.3rem 0;
  color: #ccc;
}

.content p {
  margin: 0;
  color: #ccc;
}

.content iframe {
  margin-top: 1rem;
  border-radius: 10px;
  width: 100%;
  height: 152px;
  border: none;
}

.event.past {
  border-left: 5px solid #888;
}

.event.upcoming {
  border-left: 5px solid #0f0;
}

@media screen and (max-width: 600px) {
  #timeline {
    padding: 1rem;
  }

  .year {
    font-size: 1.5rem;
  }

  .content h3 {
    font-size: 1.1rem;
  }
}