/* ════════════════════════════════════════════
   design.css — Design Content subpage
   ════════════════════════════════════════════ */

/* ── Design Hero ── */
.design-hero {
  padding: calc(var(--nav-h) + 4rem) var(--section-px) 3rem;
  max-width: calc(var(--max-w) + 2 * 6rem);
  margin: 0 auto;
  text-align: center;
}
.design-hero__title {
  font-family: var(--ff-head);
  font-size: clamp(2.4rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -.03em;
  margin-bottom: 1.5rem;
}
.design-hero__title em {
  font-style: italic;
  color: var(--gold);
  text-shadow: 0 0 40px rgba(198, 169, 98, .3);
}
.design-hero__sub {
  color: var(--text-dim);
  font-size: 1.1rem;
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ── Filter Tabs ── */
.design-filters {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: .6rem;
  padding: 2rem var(--section-px) 3rem;
  max-width: calc(var(--max-w) + 2 * 6rem);
  margin: 0 auto;
}
.design-filter {
  font-family: var(--ff-mono);
  font-size: .78rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  padding: .5rem 1.2rem;
  border: 1px solid var(--border);
  border-radius: 100px;
  color: var(--text-dim);
  cursor: pointer;
  transition: all .25s var(--ease);
}
.design-filter:hover {
  border-color: var(--gold-dk);
  color: var(--text);
}
.design-filter.active {
  background: var(--gold);
  border-color: var(--gold);
  color: #0e0e0e;
}

/* ── Masonry Grid ── */
.design-gallery {
  padding: 0 var(--section-px) 4rem;
  max-width: calc(var(--max-w) + 2 * 6rem);
  margin: 0 auto;
}
.design-gallery__grid {
  columns: 3;
  column-gap: 1rem;
}
.design-gallery__item {
  position: relative;
  break-inside: avoid;
  margin-bottom: 1rem;
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--bg-card);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .5s var(--ease), transform .5s var(--ease);
}
.design-gallery__item.visible {
  opacity: 1;
  transform: translateY(0);
}
.design-gallery__item img {
  width: 100%;
  display: block;
  transition: transform .6s var(--ease);
}
.design-gallery__item:hover img {
  transform: scale(1.05);
}
.design-gallery__item figcaption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 2.5rem 1.25rem 1.25rem;
  background: linear-gradient(to top, rgba(0,0,0,.85) 0%, rgba(0,0,0,.4) 60%, transparent 100%);
  display: flex;
  flex-direction: column;
  gap: .25rem;
  transform: translateY(100%);
  transition: transform .4s var(--ease);
}
.design-gallery__item:hover figcaption {
  transform: translateY(0);
}
.dg-cat {
  font-family: var(--ff-mono);
  font-size: .68rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--gold);
}
.dg-title {
  font-family: var(--ff-head);
  font-size: .95rem;
  font-weight: 600;
  color: var(--text);
}

@media (max-width: 1023px) {
  .design-gallery__grid { columns: 2; }
}
@media (max-width: 600px) {
  .design-gallery__grid { columns: 1; }
}

/* ── Lightbox ── */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(0, 0, 0, .92);
  backdrop-filter: blur(20px);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  opacity: 0;
  pointer-events: none;
  transition: opacity .35s var(--ease);
}
.lightbox.active {
  opacity: 1;
  pointer-events: all;
}
.lightbox__img {
  max-width: 90vw;
  max-height: 80vh;
  object-fit: contain;
  border-radius: var(--radius);
  box-shadow: 0 20px 80px rgba(0,0,0,.6);
  transition: transform .3s var(--ease);
}
.lightbox.active .lightbox__img {
  animation: lb-pop .4s var(--ease);
}
@keyframes lb-pop {
  from { transform: scale(.9); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}
.lightbox__caption {
  margin-top: 1.5rem;
  font-family: var(--ff-head);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
  text-align: center;
}
.lightbox__close,
.lightbox__prev,
.lightbox__next {
  position: absolute;
  background: none;
  color: var(--text);
  cursor: pointer;
  transition: color .2s, transform .2s;
  z-index: 10;
}
.lightbox__close {
  top: 1.5rem;
  right: 1.5rem;
  font-size: 2.5rem;
  line-height: 1;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,.15);
}
.lightbox__close:hover {
  color: var(--gold);
  border-color: var(--gold);
}
.lightbox__prev,
.lightbox__next {
  top: 50%;
  transform: translateY(-50%);
  font-size: 3rem;
  padding: .5rem;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,.1);
}
.lightbox__prev { left: 1.5rem; }
.lightbox__next { right: 1.5rem; }
.lightbox__prev:hover,
.lightbox__next:hover {
  color: var(--gold);
  border-color: var(--gold);
  background: rgba(198, 169, 98, .08);
}

/* ── CTA ── */
.design-cta {
  text-align: center;
  padding: 3rem var(--section-px) 5rem;
}
.design-cta p {
  font-family: var(--ff-head);
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}