.timeline-section { padding: 28px 0 64px; }

.timeline {
  position: relative;
  max-width: 860px;
  margin: 0 auto;
  padding-left: 40px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--blue-primary), transparent);
}
.tl-item {
  position: relative;
  padding: 24px 28px;
  margin-bottom: 24px;
}
.tl-item::before {
  content: '';
  position: absolute;
  left: -34px;
  top: 32px;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--blue-primary);
  box-shadow: 0 0 15px var(--blue-primary), 0 0 0 4px rgba(18, 97, 201, 0.2);
}
.tl-period {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--blue-light);
  margin-bottom: 8px;
}
.tl-item h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
}
.tl-item p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.65;
  margin: 0 0 12px;
}
.tl-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

/* Certifications */
.cert-section { padding: 64px 0; }
.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  max-width: 960px;
  margin: 0 auto;
}
.cert-card { padding: 28px; text-align: center; }
.cert-badge {
  width: 60px; height: 60px;
  margin: 0 auto 18px;
  background: linear-gradient(135deg, var(--blue-dark), var(--blue-primary));
  border-radius: 50%;
  display: grid;
  place-items: center;
  box-shadow: 0 10px 30px rgba(18, 97, 201, 0.3);
}
.cert-badge svg { width: 26px; height: 26px; color: #fff; }
.cert-card h3 { font-size: 1.05rem; margin-bottom: 6px; }
.cert-org {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 12px;
}
.cert-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin: 0;
}

/* GitHub */
.github-section { padding: 64px 0; }
.gh-card {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 40px;
  text-align: center;
}
.gh-avatar {
  width: 80px; height: 80px;
  border-radius: 50%;
  margin: 0 auto 20px;
  background: linear-gradient(135deg, var(--blue-dark), var(--blue-primary));
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: #fff;
  box-shadow: 0 0 40px rgba(59, 130, 246, 0.3);
}
.gh-card h3 { font-size: 1.4rem; margin-bottom: 6px; }
.gh-handle {
  font-family: var(--font-mono);
  color: var(--blue-light);
  font-size: 0.95rem;
  margin-bottom: 16px;
}
.gh-card p {
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.7;
}

@media (max-width: 768px) {
  .timeline { padding-left: 24px; }
  .timeline::before { left: 6px; }
  .tl-item::before { left: -22px; width: 10px; height: 10px; }
}
.gh-avatar { overflow:hidden; padding:0; }
.gh-avatar img { width:100%; height:100%; object-fit:cover; }