.tech {
  background-color: var(--black);
  padding-block: clamp(3rem, 8vw, 6rem);
}

.tech__header {
  max-width: 620px;
  margin-inline: auto;
  text-align: center;
}

.tech__title,
.tech__desc {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s var(--ease-default), transform 0.6s var(--ease-default);
}

.tech__title.in-view,
.tech__desc.in-view {
  opacity: 1;
  transform: none;
}

.tech__desc.in-view {
  transition-delay: 0.08s;
}

.tech__title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  color: var(--white);
}

.tech__desc {
  margin-top: 1rem;
  color: #838383;
  font-weight: 600;
  line-height: 1.5;
}

.tech__desc strong {
  color: var(--white);
  font-weight: 700;
}

.tech__timeline {
  position: relative;
  max-width: 900px;
  margin: clamp(3rem, 8vw, 5rem) auto 0;
  padding-inline: var(--section-padding-x);
}

.tech__line {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 2px;
  transform: translateX(-50%);
  background-color: rgba(217, 217, 217, 0.12);
}

/* Animados por transform (compositor), nunca por height/top. */
.tech__line-progress {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--orange);
  transform: scaleY(0);
  transform-origin: top;
  will-change: transform;
}

.tech__marker {
  position: absolute;
  top: 0;
  left: 50%;
  width: 12px;
  height: 12px;
  transform: translate(-50%, -50%);
  background-color: var(--orange);
  border-radius: 2px;
  box-shadow: 0 0 12px 2px rgba(224, 104, 25, 0.55),
    0 0 28px 6px rgba(224, 104, 25, 0.25);
  will-change: transform;
}

/* Pulso contínuo, como um sinal transmitindo. */
.tech__marker::after {
  content: "";
  position: absolute;
  inset: -4px;
  border: 1px solid var(--orange);
  border-radius: 4px;
  animation: marker-pulse 2.4s var(--ease-default) infinite;
  pointer-events: none;
}

@keyframes marker-pulse {
  0% {
    opacity: 0.6;
    transform: scale(1);
  }
  70%,
  100% {
    opacity: 0;
    transform: scale(2.4);
  }
}

.tech__list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  column-gap: clamp(2rem, 6vw, 4.5rem);
}

.tech__item {
  grid-column: 2;
  padding-block: clamp(3rem, 8vw, 5.5rem);
  text-align: left;
}

.tech__item--left {
  grid-column: 1;
  text-align: right;
}

.tech__item:nth-child(1) {
  grid-row: 1;
}

.tech__item:nth-child(2) {
  grid-row: 2;
}

.tech__item:nth-child(3) {
  grid-row: 3;
}

.tech__item:nth-child(4) {
  grid-row: 4;
}

.tech__item:nth-child(5) {
  grid-row: 5;
}

.tech__item:nth-child(6) {
  grid-row: 6;
}

.tech__item-title {
  font-size: clamp(1.25rem, 2.1vw, 1.55rem);
  font-weight: 700;
  line-height: 1.3;
  color: #3a3a3a;
  opacity: 0.6;
  transform: translateY(8px);
  transition: color 0.4s var(--ease-default), opacity 0.4s var(--ease-default),
    transform 0.4s var(--ease-default);
}

.tech__item-text {
  margin-top: 0.6rem;
  max-width: 34ch;
  font-size: clamp(0.9rem, 1.35vw, 1.05rem);
  font-weight: 400;
  line-height: 1.5;
  color: #2e2e2e;
  opacity: 0.5;
  transform: translateY(8px);
  transition: color 0.4s var(--ease-default), opacity 0.4s var(--ease-default),
    transform 0.4s var(--ease-default);
}

/* Nos itens da esquerda a caixa encosta na linha central, não na borda. */
.tech__item--left .tech__item-text {
  margin-left: auto;
}

.tech__item.is-active .tech__item-title {
  color: var(--white);
  opacity: 0.85;
  transform: none;
}

.tech__item.is-active .tech__item-text {
  color: var(--gray);
  opacity: 0.75;
  transform: none;
}

.tech__item.is-current .tech__item-title {
  opacity: 1;
}

.tech__item.is-current .tech__item-text {
  opacity: 1;
}

/*
  Fica fora da .tech__timeline de propósito: dentro dela, a altura extra
  faria a linha de progresso continuar depois do último item.
  A entrada anima o wrapper, e não o botão, para não disputar o
  `transform` com o hover.
*/
.tech__cta {
  display: flex;
  justify-content: center;
  margin-top: clamp(2.5rem, 6vw, 4rem);
  padding-inline: var(--section-padding-x);
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s var(--ease-default), transform 0.6s var(--ease-default);
}

.tech__cta.in-view {
  opacity: 1;
  transform: none;
}

@media (max-width: 720px) {
  .tech__line {
    left: 28px;
    transform: none;
  }

  .tech__marker {
    left: 29px; /* centro da linha de 2px que começa em 28px */
  }

  .tech__list {
    grid-template-columns: 1fr;
    padding-left: 60px;
  }

  .tech__item,
  .tech__item--left {
    grid-column: 1;
    text-align: left;
  }

  .tech__item--left .tech__item-text {
    margin-left: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .tech__item-title,
  .tech__item-text {
    transition: color 0.2s, opacity 0.2s;
    transform: none;
  }

  .tech__marker::after {
    animation: none;
  }
}