.implementation {
  background: #18181d;
}

.implementation .section-head > p {
  max-width: 680px;
  color: var(--muted);
  margin: 18px 0 0;
}

.timeline {
  border-top: 1px solid var(--line);
}

.timeline details {
  border-bottom: 1px solid var(--line);
}

.timeline summary {
  display: grid;
  grid-template-columns: 46px 1fr 30px;
  gap: 20px;
  align-items: center;
  min-height: 96px;
  padding: 18px 10px;
  cursor: pointer;
  list-style: none;
}

.timeline summary::-webkit-details-marker {
  display: none;
}

.timeline summary > span {
  color: var(--cyan);
  font-size: 11px;
  font-weight: 700;
}

.timeline summary h3 {
  margin: 0 0 5px;
  font: 700 20px Manrope, sans-serif;
}

.timeline summary small {
  color: var(--muted);
}

.timeline summary b {
  color: var(--cyan);
  font: 400 24px Inter, sans-serif;
  transition: transform .2s;
}

.timeline details[open] summary b {
  transform: rotate(45deg);
}

.timeline details[open] summary {
  background: rgba(255, 255, 255, .025);
}

.timeline-content {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  padding: 8px 86px 34px 76px;
}

.timeline-content h4 {
  margin: 0 0 10px;
  color: var(--cyan);
  font: 600 11px Inter, sans-serif;
  letter-spacing: 1.2px;
  text-transform: uppercase;
}

.timeline-content p,
.timeline-content li {
  color: var(--muted);
  font-size: 14px;
}

.timeline-content p {
  margin: 0;
}

.timeline-content ul {
  margin: 0;
  padding-left: 18px;
}

.timeline-content li + li {
  margin-top: 7px;
}

.timeline-content .checks {
  list-style: none;
  padding: 0;
}

.timeline-content .checks li::before {
  content: "✓";
  color: var(--cyan);
  margin-right: 8px;
}

.pdf-exporting .timeline details {
  break-inside: avoid;
  page-break-inside: avoid;
}

@media (max-width: 700px) {
  .timeline summary {
    grid-template-columns: 32px 1fr 22px;
    gap: 10px;
    min-height: 84px;
    padding-inline: 4px;
  }

  .timeline summary h3 {
    font-size: 17px;
  }

  .timeline-content {
    grid-template-columns: 1fr;
    padding: 5px 36px 28px 42px;
  }
}