/* Portfolio — sketch501 hero + case study card grid */

.portfolio-page {
  --portfolio-page-bg: #ececec;
  --portfolio-card-bg: #f7f7f5;
  --portfolio-gap: 8px;
  --portfolio-radius: 18px;
  --portfolio-inner-radius: 14px;
  --portfolio-card-max-height: 420px;
  --portfolio-card-height: min(var(--portfolio-card-max-height), 72dvh);
  --portfolio-reveal-duration: 3s;
  background: var(--portfolio-page-bg);
  color: #111;
  text-transform: lowercase;
}

.portfolio-shell {
  min-height: 100dvh;
  padding: var(--portfolio-gap);
  padding-top: 0;
  box-sizing: border-box;
}

.portfolio-page .chapter-header {
  padding: 0 22px;
  height: 60px;
  box-sizing: border-box;
}

.portfolio-main {
  position: relative;
  z-index: 1;
}

.portfolio-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--portfolio-gap);
}

.portfolio-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  height: var(--portfolio-card-height);
  max-height: var(--portfolio-card-max-height);
  padding: 18px 18px 16px;
  border-radius: var(--portfolio-radius);
  background: var(--portfolio-card-bg);
  overflow: hidden;
  box-sizing: border-box;
}

.portfolio-card__head {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding-inline: 2px;
  flex: 0 0 auto;
  position: relative;
  z-index: 2;
  opacity: 0;
  transition: opacity var(--portfolio-reveal-duration) ease;
  pointer-events: none;
}

.portfolio-card__copy {
  display: grid;
  gap: 6px;
  min-width: 0;
}

.portfolio-card__mark {
  flex: 0 0 auto;
  margin-top: 1px;
  overflow: visible;
}

.portfolio-card__mark svg {
  display: block;
  width: auto;
  height: clamp(17px, 2.5vw, 22px);
  overflow: visible;
}

.portfolio-card.is-revealed .portfolio-card__head {
  opacity: 1;
  pointer-events: auto;
}

.portfolio-card__title {
  margin: 0;
  font-family: var(--font-family-code);
  font-size: clamp(0.88rem, 1.5vw, 1rem);
  font-weight: 300;
  letter-spacing: 0.02em;
  line-height: 1.15;
}

.portfolio-card__subtitle {
  margin: 0;
  font-family: var(--font-family-code);
  font-size: clamp(0.88rem, 1.5vw, 1rem);
  font-weight: 300;
  line-height: 1.15;
  letter-spacing: 0.01em;
}

.portfolio-card__carousel {
  --portfolio-flip-visible: 1.2;
  position: relative;
  flex: 1 1 0;
  display: flex;
  gap: var(--portfolio-gap);
  min-height: 0;
  max-height: 100%;
  overflow: hidden;
  touch-action: pan-y;
}

.portfolio-card:not(.is-revealed) .portfolio-card__carousel {
  background: #fff;
}

.portfolio-card__carousel img {
  position: relative;
  flex: 0 0 calc((100% - var(--portfolio-gap)) / var(--portfolio-flip-visible));
  min-width: 0;
  height: 100%;
  border-radius: var(--portfolio-inner-radius);
  object-fit: cover;
  object-position: center center;
  opacity: 0;
  transition: opacity var(--portfolio-reveal-duration) ease;
}

.portfolio-card.is-revealed .portfolio-card__carousel img {
  opacity: 1;
}

.portfolio-card__carousel img.is-carousel-hidden {
  display: none;
}

@media (min-width: 768px) {
  .portfolio-page {
    --portfolio-card-max-height: 600px;
    --portfolio-card-height: min(var(--portfolio-card-max-height), calc(100dvh - 108px));
  }

  .portfolio-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1200px) {
  .portfolio-page {
    --portfolio-card-max-height: 720px;
    --portfolio-card-height: min(var(--portfolio-card-max-height), calc(100dvh - 108px));
  }
}