.portfolio-page { background: var(--white); }
.portfolio-page .site-header { position: sticky; top: 0; }

.portfolio-intro {
  display: grid;
  grid-template-columns: 1fr minmax(20rem, 1.35fr) minmax(16rem, 0.65fr);
  align-items: end;
  gap: clamp(2rem, 5vw, 6rem);
  padding: clamp(5rem, 9vw, 9rem) var(--gutter) clamp(4rem, 7vw, 7rem);
  background: var(--paper);
}
.portfolio-intro h1 { max-width: 9ch; margin: 0; font-size: clamp(4rem, 8.2vw, 9rem); }
.portfolio-intro > p:last-child { max-width: 28rem; font-size: clamp(1rem, 1.4vw, 1.25rem); }

.portfolio-filter {
  position: sticky;
  z-index: 10;
  top: 6.25rem;
  display: flex;
  gap: 0;
  padding: 0 var(--gutter);
  overflow-x: auto;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 253, 250, 0.96);
  scrollbar-width: none;
}
.portfolio-filter::-webkit-scrollbar { display: none; }
.portfolio-filter button {
  flex: 0 0 auto;
  padding: 1.3rem clamp(1rem, 2.5vw, 2rem);
  border: 0;
  border-bottom: 2px solid transparent;
  background: transparent;
  color: rgba(22,21,18,0.52);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
}
.portfolio-filter button:first-child { padding-left: 0; }
.portfolio-filter button:hover { color: var(--ink); }
.portfolio-filter button.active { border-bottom-color: var(--rust); color: var(--ink); }

.portfolio-collection { padding: clamp(4rem, 8vw, 8rem) var(--gutter) clamp(6rem, 10vw, 11rem); }
.portfolio-collection[hidden] { display: none; }
.collection-heading {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: end;
  gap: 3rem;
  margin-bottom: clamp(2.5rem, 5vw, 5rem);
}
.collection-heading h2 {
  font-family: var(--serif);
  font-size: clamp(3.2rem, 6vw, 7rem);
  font-weight: 400;
  letter-spacing: -0.055em;
  line-height: 0.9;
}
.collection-heading p { justify-self: end; max-width: 32rem; }
.photo-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-auto-rows: clamp(12rem, 19vw, 22rem);
  gap: clamp(0.75rem, 1.5vw, 1.5rem);
}
.photo-grid figure { grid-column: span 4; overflow: hidden; background: var(--paper-deep); }
.photo-grid figure.featured { grid-column: span 8; grid-row: span 2; }
.photo-grid figure:nth-child(4) { grid-column: span 5; }
.photo-grid figure:nth-child(5) { grid-column: span 3; }
.photo-grid figure:nth-child(6) { grid-column: span 4; }
.photo-grid img { height: 100%; object-fit: cover; transition: transform 600ms cubic-bezier(.2,.75,.25,1); }
.photo-grid figure:hover img { transform: scale(1.025); }

.portfolio-cta {
  display: flex;
  align-items: center;
  flex-direction: column;
  padding: clamp(6rem, 12vw, 12rem) var(--gutter);
  background: var(--paper);
  text-align: center;
}
.portfolio-cta h2 { max-width: 12ch; margin: 1.5rem auto 2.5rem; }

@media (max-width: 1050px) {
  .portfolio-intro { grid-template-columns: 0.4fr 1.2fr; }
  .portfolio-intro > p:last-child { grid-column: 2; }
}

@media (max-width: 760px) {
  .portfolio-page .site-header { position: relative; }
  .portfolio-filter { top: 0; padding-left: var(--gutter); }
  .portfolio-intro { grid-template-columns: 1fr; }
  .portfolio-intro > p:last-child { grid-column: auto; }
  .portfolio-intro h1 { font-size: clamp(3.6rem, 17vw, 6rem); }
  .collection-heading { grid-template-columns: 1fr; gap: 1rem; }
  .collection-heading p { justify-self: start; }
  .photo-grid { grid-template-columns: 1fr 1fr; grid-auto-rows: clamp(14rem, 60vw, 24rem); }
  .photo-grid figure,
  .photo-grid figure:nth-child(4),
  .photo-grid figure:nth-child(5),
  .photo-grid figure:nth-child(6) { grid-column: span 1; }
  .photo-grid figure.featured { grid-column: 1 / -1; grid-row: span 1; }
}

@media (max-width: 460px) {
  .photo-grid { grid-template-columns: 1fr; grid-auto-rows: 80vw; }
  .photo-grid figure,
  .photo-grid figure.featured,
  .photo-grid figure:nth-child(4),
  .photo-grid figure:nth-child(5),
  .photo-grid figure:nth-child(6) { grid-column: auto; }
}