body {
  background:#111;
  color: #eee;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  padding: 2rem 1rem;
  margin: 0;
  user-select: none;
  padding-top: 70px;
}

h1 {
  text-align: center;
  font-size: 3rem;
  margin-bottom: 3rem;
}

.timeline {
  position: relative;
  margin: 0 auto;
  max-width: 600px;
  padding-left: 40px;
  border-left: 4px solid #22d1ee;
}

.timeline-item {
  position: relative;
  margin-bottom: 3.5rem;
  display: flex;
  align-items: flex-start;
}

.timeline-point {
  position: absolute;
  left: -12px;
  top: 5px;
  width: 20px;
  height: 20px;
  background: linear-gradient(to bottom, #22d1ee, #70ffcc);
  border-radius: 50%;
  box-shadow: 0 0 10px linear-gradient(to bottom, #22d1ee, #70ffcc);
}

.timeline-content {
  padding-left: 20px;
  max-width: 500px;
}

.date {
  font-weight: 700;
  font-size: 1.3rem;
  margin-bottom: 0.3rem;
  color: linear-gradient(to bottom, #22d1ee, #70ffcc);
}

.detail {
  font-weight: 400;
  font-size: 1.1rem;
  line-height: 1.4;
}

.btn-accueil {
  position: absolute;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  background-color: #70d6ff;
  color: white;
  padding: 10px 25px;
  border-radius: 12px;
  text-decoration: none;
  font-weight: bold;
  font-size: 16px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn-accueil:hover {
  transform: translateX(-50%) translateY(-2px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
}

.timeline-item {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.5s ease forwards;
}

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}