/* =========================
   Timeline
========================= */
.timeline {
  position: relative;
  padding: 20px 0;
}

.timeline::before {
  content: '';
  position: absolute;
  width: 2px;
  background-color: #0d6efd;
  top: 0;
  bottom: 0;
  left: 50%;
  margin-left: -1px;
}

.timeline-item {
  position: relative;
  width: 50%;
  padding: 10px 40px;
  box-sizing: border-box;
}

.timeline-item::after {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  background-color: white;
  border: 4px solid #0d6efd;
  border-radius: 50%;
  top: 15px;
}

.timeline-content {
  padding: 20px;
  background-color: #393C46;
  border-radius: 8px;
  box-shadow: -1px 5px 5px 6px rgba(0, 0, 0, 0.1);
}

.left {
  left: 0;
}

.right {
  left: 50%;
}

.left::after {
  right: -10px;
}

.right::after {
  left: -10px;
}

@media (max-width: 768px) {
  .timeline::before {
    left: 31px;
  }

  .timeline-item {
    width: 100%;
    padding-left: 70px;
    padding-right: 25px;
  }

  .timeline-item.left::after,
  .timeline-item.right::after {
    left: 21px;
  }

  .right {
    left: 0;
  }
}

.dropdown-btn {
  color: #FFD700;
  font-weight: bold;
  padding: 0.25rem 0.5rem;
  cursor: pointer;
  position: relative;
  transition: all 0.3s;
  transition: transform 0.3s ease;
}

.dropdown-btn:hover {
  color: #ffffff;
  transform: translateY(-5px);
}

.dropdown-btn::after {
  content: " ▼";
  font-size: 0.8rem;
}

.dropdown-btn.active::after {
  content: " ▲";
}

.dropdown-content {
  display: none;
}

.dropdown-content.show {
  display: block;
}

/* certificates */
.certificate {
  transition: transform 0.3s ease;
  box-shadow: -1px 5px 5px 6px rgba(0, 0, 0, 0.1);
}

.certificate:hover {
  transform: translateY(-5px);
}