/* ========================================
   LUMIÈRE — Portfolio Gallery CSS
   Extends style.css (shared variables/nav/footer)
   ======================================== */

/* ── NAV ACTIVE ── */
.nav-active {
  color: var(--gold) !important;
}
.nav-active::after {
  transform: scaleX(1) !important;
}

/* ── PAGE TITLE BAR ── */
.page-title-bar {
  background: var(--light);
  padding: 6.5rem 8% 2rem;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  border-bottom: 1px solid rgba(0, 0, 0, 0.07);
}
.page-title-heading {
  font-family: var(--serif);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 400;
  letter-spacing: 0.12em;
  color: var(--dark);
}
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--sans);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.breadcrumb a {
  color: var(--text-light);
  text-decoration: none;
  transition: color 0.3s;
}
.breadcrumb a:hover {
  color: var(--gold);
}
.bc-sep {
  color: var(--text-light);
}
.bc-current {
  color: var(--gold);
}

/* ── GALLERY SECTION ── */
.gallery-section {
  background: var(--white);
  padding: 4rem 6% 5rem;
}

/* ── FILTER TABS ── */
.filter-tabs {
  display: flex;
  justify-content: center;
  gap: 2.5rem;
  margin-bottom: 3rem;
}
.filter-tab {
  background: none;
  border: none;
  font-family: var(--sans);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-light);
  cursor: pointer;
  padding: 0.3rem 0;
  position: relative;
  transition: color 0.3s ease;
}
.filter-tab::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--gold);
  transform: scaleX(0);
  transition: transform 0.3s ease;
}
.filter-tab:hover {
  color: var(--dark);
}
.filter-tab.active {
  color: var(--gold);
}
.filter-tab.active::after {
  transform: scaleX(1);
}

/* ── GALLERY GRID ── */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  max-width: 1050px;
  margin: 0 auto;
}

/* ── GALLERY ITEM ── */
.gallery-item {
  position: relative;
  overflow: hidden;
  aspect-ratio: 1 / 1;
  cursor: pointer;
  background: var(--dark-3);
}
.gallery-item.hidden-item {
  display: none;
}
.gallery-item.filter-hide {
  display: none;
}
.gallery-item.filter-show {
  display: block;
  animation: filterReveal 0.4s ease both;
}

@keyframes filterReveal {
  from {
    opacity: 0;
    transform: scale(0.97);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.gi-img {
  width: 100%;
  height: 100%;
  background-size: cover !important;
  background-position: center !important;
  transition: transform 0.7s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.gallery-item:hover .gi-img {
  transform: scale(1.07);
}

/* Overlay on hover */
.gi-overlay {
  position: absolute;
  inset: 0;
  background: rgba(17, 12, 5, 0);
  display: flex;
  align-items: flex-end;
  transition: background 0.4s ease;
}
.gallery-item:hover .gi-overlay {
  background: rgba(17, 12, 5, 0.72);
}
.gi-overlay-inner {
  padding: 1.4rem 1.6rem;
  width: 100%;
  transform: translateY(12px);
  opacity: 0;
  transition:
    opacity 0.35s ease,
    transform 0.35s ease;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}
.gallery-item:hover .gi-overlay-inner {
  opacity: 1;
  transform: translateY(0);
}
.gi-cat {
  font-family: var(--sans);
  font-size: 0.55rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
  font-weight: 600;
}
.gi-title {
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 400;
  color: var(--white);
}
.gi-zoom {
  position: absolute;
  top: 1.2rem;
  right: 1.2rem;
  width: 36px;
  height: 36px;
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 50%;
  background: transparent;
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transform: rotate(45deg) scale(0.8);
  transition:
    opacity 0.3s ease,
    transform 0.3s ease,
    background 0.3s ease,
    border-color 0.3s ease;
}
.gallery-item:hover .gi-zoom {
  opacity: 1;
  transform: rotate(0) scale(1);
}
.gi-zoom:hover {
  background: var(--gold);
  border-color: var(--gold);
}

/* ── LOAD MORE ── */
.load-more-wrap {
  text-align: center;
  margin-top: 3rem;
}
.btn-load-more {
  background: var(--dark);
  color: var(--white);
  border: none;
  padding: 1rem 3.5rem;
  font-family: var(--sans);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  cursor: pointer;
  transition:
    background 0.3s ease,
    transform 0.3s ease;
  position: relative;
  overflow: hidden;
}
.btn-load-more::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--gold);
  transform: translateX(-101%);
  transition: transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.btn-load-more:hover::before {
  transform: translateX(0);
}
.btn-load-more span {
  position: relative;
  z-index: 1;
}
.btn-load-more:hover {
  color: var(--dark);
}
.btn-load-more.loaded {
  opacity: 0.4;
  cursor: default;
  pointer-events: none;
}

/* ── ITEM REVEAL ANIMATION ── */
.gallery-item {
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity 0.5s ease,
    transform 0.5s ease,
    background 0.3s;
}
.gallery-item.item-visible {
  opacity: 1;
  transform: translateY(0);
}
/* Stagger delays for initial 12 items */
.gallery-item:nth-child(1) {
  transition-delay: 0.05s;
}
.gallery-item:nth-child(2) {
  transition-delay: 0.1s;
}
.gallery-item:nth-child(3) {
  transition-delay: 0.15s;
}
.gallery-item:nth-child(4) {
  transition-delay: 0.2s;
}
.gallery-item:nth-child(5) {
  transition-delay: 0.25s;
}
.gallery-item:nth-child(6) {
  transition-delay: 0.3s;
}
.gallery-item:nth-child(7) {
  transition-delay: 0.35s;
}
.gallery-item:nth-child(8) {
  transition-delay: 0.4s;
}
.gallery-item:nth-child(9) {
  transition-delay: 0.45s;
}
.gallery-item:nth-child(10) {
  transition-delay: 0.5s;
}
.gallery-item:nth-child(11) {
  transition-delay: 0.55s;
}
.gallery-item:nth-child(12) {
  transition-delay: 0.6s;
}

/* ── LIGHTBOX ── */
.lightbox-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(10, 8, 5, 0.95);
  z-index: 1100;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
  backdrop-filter: blur(4px);
}
.lightbox-backdrop.active {
  opacity: 1;
  pointer-events: all;
}
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 1200;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
}
.lightbox.active {
  opacity: 1;
  pointer-events: all;
}
.lb-stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 90vw;
  max-height: 90vh;
}
.lb-img-wrap {
  width: min(80vw, 800px);
  height: min(70vh, 600px);
  overflow: hidden;
  position: relative;
}
.lb-img {
  width: 100%;
  height: 100%;
  background-size: cover !important;
  background-position: center !important;
  transition: transform 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.lb-caption {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
  margin-top: 1.2rem;
}
.lb-cat {
  font-family: var(--sans);
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
}
.lb-name {
  font-family: var(--serif);
  font-size: 1.3rem;
  font-weight: 300;
  color: var(--white);
}
.lb-close {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border-radius: 50%;
  transition: all 0.3s ease;
  z-index: 10;
}
.lb-close:hover {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--dark);
}
.lb-arrow {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border-radius: 50%;
  transition: all 0.3s ease;
  z-index: 10;
}
.lb-prev {
  left: 1.5rem;
}
.lb-next {
  right: 1.5rem;
}
.lb-arrow:hover {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--dark);
}

/* ── BACK TO TOP ── */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 42px;
  height: 42px;
  background: var(--dark);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 800;
  opacity: 0;
  transform: translateY(10px);
  transition: all 0.3s ease;
}
.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
}
.back-to-top:hover {
  background: var(--gold);
  border-color: var(--gold);
}

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }
  .page-title-bar {
    flex-direction: column;
    gap: 0.5rem;
    padding: 6rem 5% 1.5rem;
  }
  .filter-tabs {
    gap: 1.5rem;
    flex-wrap: wrap;
  }
  .lb-prev {
    left: 0.5rem;
  }
  .lb-next {
    right: 0.5rem;
  }
}

@media (max-width: 600px) {
  .nav-links {
    display: none;
  }
  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 6px;
  }
  .gallery-section {
    padding: 3rem 4% 4rem;
  }
  .filter-tabs {
    gap: 1rem;
  }
  .filter-tab {
    font-size: 0.58rem;
  }
  .lb-img-wrap {
    width: 95vw;
    height: 55vw;
  }
}