/* Seções, títulos (.head), revelação ao rolar (.reveal) e divisores numerados. */
section {
  position: relative;
}
.block {
  padding: 120px 0;
}
.head {
  max-width: 760px;
  margin-bottom: 60px;
}
.head .section-tag {
  margin-bottom: 18px;
  display: block;
}
.head h2 {
  font-family: var(--heading);
  text-transform: uppercase;
  letter-spacing: -0.01em;
  font-size: clamp(2.4rem, 5.5vw, 4.6rem);
  line-height: 0.94;
}
.head h2 em {
  color: var(--accent);
  font-style: normal;
}
.head p {
  color: var(--muted);
  max-width: 620px;
  margin-top: 22px;
  font-size: 1.05rem;
}
.reveal {
  opacity: 0;
  filter: blur(6px);
  transition:
    opacity 1s var(--ease),
    transform 1s var(--ease),
    filter 1s var(--ease);
  will-change: opacity, transform;
  transform: translateY(42px) scale(0.985);
}
.reveal.in {
  opacity: 1;
  filter: blur();
  transform: none;
}
.sec-divider {
  max-width: var(--maxw);
  align-items: center;
  gap: 18px;
  margin: 0 auto;
  padding: 30px 28px;
  display: flex;
}
.sec-divider .sd-index {
  font-family: var(--heading);
  color: #0000;
  -webkit-text-stroke: 1.3px var(--accent);
  opacity: 0;
  transition:
    opacity 0.6s var(--ease),
    transform 0.6s var(--ease);
  font-size: clamp(1.7rem, 4.5vw, 2.6rem);
  font-weight: 800;
  font-stretch: 125%;
  line-height: 1;
  transform: translate(-16px);
}
.sec-divider .sd-label {
  font-family: var(--tech);
  text-transform: uppercase;
  letter-spacing: 0.26em;
  color: var(--muted);
  white-space: nowrap;
  opacity: 0;
  transition:
    opacity 0.6s var(--ease) 0.12s,
    transform 0.6s var(--ease) 0.12s;
  font-size: 0.7rem;
  transform: translate(-12px);
}
.sec-divider .sd-line {
  background: var(--line);
  transform-origin: 0;
  height: 1px;
  transition: transform 1.1s var(--ease) 0.22s;
  flex: 1;
  position: relative;
  overflow: hidden;
  transform: scaleX(0);
}
.sec-divider .sd-line:after {
  content: "";
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  width: 38%;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  transform: translate(-130%);
}
.sec-divider.in .sd-index,
.sec-divider.in .sd-label {
  opacity: 1;
  transform: none;
}
.sec-divider.in .sd-line {
  transform: scaleX(1);
}
.sec-divider.in .sd-line:after {
  animation: sd-run 1.3s var(--ease) 0.5s forwards;
}
@keyframes sd-run {
  to {
    transform: translate(330%);
  }
}
.head.reveal {
  opacity: 1;
  filter: none;
  transform: none;
}
.head.reveal > * {
  opacity: 0;
  filter: blur(6px);
  transition:
    opacity 0.85s var(--ease),
    transform 0.85s var(--ease),
    filter 0.85s var(--ease);
  transform: translateY(28px);
}
.head.reveal.in > * {
  opacity: 1;
  filter: blur();
  transform: none;
}
.head.reveal.in > :first-child {
  transition-delay: 50ms;
}
.head.reveal.in > :nth-child(2) {
  transition-delay: 0.2s;
}
.head.reveal.in > :nth-child(3) {
  transition-delay: 0.35s;
}