body {
  background-color: #121212;
  color: #ddd;
  font-family: Arial, sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 0 20px;
}

#profile p {
  text-align: center;
}

header {
  text-align: center;
  padding: 40px 0 20px 0;
}

h1 { margin-bottom: 5px; }
h2 { margin-top: 0; color: #00bfff; }
h3 { color: #007acc; border-bottom: 2px solid #007acc; padding-bottom: 5px; }

section { margin-bottom: 40px; }

.timeline {
  display: flex;
  flex-direction: column;
  margin: 20px 0;
}

.timeline-item {
  display: flex;
  align-items: flex-start;
  margin-bottom: 30px;
}

.timeline-date {
  flex: 0 0 130px;
  text-align: right;
  font-weight: bold;
  color: #00bfff;
  margin-right: 20px;
  white-space: nowrap;
}

.timeline-content {
  flex: 1;
  position: relative;
  padding-left: 20px;
  background: #1e1e1e;
  border-radius: 6px;
  padding: 15px 20px;
}

.timeline-content::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: #007acc;
  border-radius: 2px;
}

details summary {
  background-color: #007acc;
  color: white;
  padding: 12px 20px;
  border-radius: 6px;
  cursor: pointer;
  font-weight: bold;
  margin-bottom: 5px;
  list-style: none;
}

details[open] summary {
  background-color: #005fa3;
}

details p {
  background-color: #1e1e1e;
  padding: 10px 20px;
  margin: 0 0 10px 0;
  border-radius: 6px;
  color: #ddd;
}

.skill-bar {
  margin: 10px 0;
  background-color: #1e1e1e;
  border-radius: 6px;
  overflow: hidden;
  position: relative;
}

.skill-name {
  display: block;
  font-weight: bold;
  margin-bottom: 5px;
}

.skill-fill {
  height: 20px;
  width: 0;
  background-color: #00bfff;
  border-radius: 6px;
  transition: width 1s ease-in-out;
}

.toggle-btn {
  background-color: #007bff;
  color: white;
  border: none;
  padding: 10px 15px;
  font-size: 14px;
  cursor: pointer;
  border-radius: 4px;
}

.toggle-btn:hover {
  background-color: #0056b3;
}