:root {
  --dps-green-primary: #0f2f26;
  --dps-green-deep: #0a221c;
  --dps-green-surface: #163d33;
  --dps-gold-accent: #c6a75e;
  --dps-gold-soft: #d4b87a;
  --dps-gold-muted: #9f8447;
  --dps-ivory: #f2f1ed;
  --dps-ivory-soft: #e7e4dc;
  --dps-shadow-deep: rgba(0, 0, 0, 0.45);
  --dps-shadow-soft: rgba(0, 0, 0, 0.25);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--dps-ivory);
  font-family: "Public Sans", sans-serif;
  background:
    radial-gradient(circle at 88% 9%, rgba(198, 167, 94, 0.14), transparent 30%),
    linear-gradient(180deg, #0a221c 0%, #0f2f26 46%, #163d33 100%);
}

.skip-link {
  position: absolute;
  left: 0.8rem;
  top: -3rem;
  background: var(--dps-gold-accent);
  color: #10211c;
  padding: 0.45rem 0.7rem;
  text-decoration: none;
  z-index: 100;
}

.skip-link:focus {
  top: 0.8rem;
}

.top-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: auto auto 1fr auto;
  gap: 0.9rem;
  align-items: center;
  padding: 0.76rem 1.2rem;
  background: rgba(10, 34, 28, 0.82);
  border-bottom: 1px solid rgba(198, 167, 94, 0.34);
}

.brand {
  color: var(--dps-ivory-soft);
  text-decoration: none;
  font-family: "Prata", serif;
  letter-spacing: 0.04em;
  font-size: 0.95rem;
}

.nav-toggle {
  display: none;
  border: 1px solid rgba(198, 167, 94, 0.38);
  background: transparent;
  color: var(--dps-ivory);
  padding: 0.35rem 0.55rem;
}

nav {
  display: flex;
  gap: 0.72rem;
  flex-wrap: wrap;
  justify-content: center;
}

nav a,
.secure-login {
  color: var(--dps-ivory);
  text-decoration: none;
  font-size: 0.84rem;
  border: 1px solid transparent;
  padding: 0.25rem 0.45rem;
}

nav a:hover,
nav a.active,
.secure-login:hover {
  border-color: var(--dps-gold-muted);
  color: var(--dps-gold-soft);
}

main {
  width: min(1160px, 95vw);
  margin: 1.65rem auto 2.7rem;
}

.academic-header {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(198, 167, 94, 0.3);
  background:
    radial-gradient(circle at 20% 18%, rgba(212, 184, 122, 0.16), transparent 40%),
    radial-gradient(circle at 82% 12%, rgba(154, 227, 200, 0.12), transparent 38%),
    rgba(10, 34, 28, 0.55);
  padding: 1.25rem 1.1rem;
  box-shadow: 0 22px 34px var(--dps-shadow-deep);
}

.academic-header::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(rgba(212, 184, 122, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(212, 184, 122, 0.06) 1px, transparent 1px);
  background-size: 58px 58px;
  opacity: 0.45;
  mix-blend-mode: screen;
  pointer-events: none;
}

.academic-header > * {
  position: relative;
  z-index: 1;
}

.academic-header p:first-child {
  margin: 0;
  color: var(--dps-gold-soft);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.72rem;
}

.academic-header h1 {
  margin: 0.45rem 0 0.5rem;
  font-family: "Prata", serif;
  font-size: clamp(1.95rem, 4.2vw, 3.1rem);
}

.academic-header p {
  margin: 0;
  line-height: 1.7;
  color: var(--dps-ivory-soft);
}

.academic-tools {
  margin-top: 1rem;
  display: grid;
  gap: 0.7rem;
  align-items: end;
}

.gallery-tools-panel {
  grid-template-columns: minmax(0, 220px) auto auto;
}

.academic-tools label {
  display: grid;
  gap: 0.3rem;
  font-size: 0.88rem;
  color: var(--dps-ivory-soft);
}

.academic-tools input,
.academic-tools select,
.academic-tools button {
  border: 1px solid rgba(198, 167, 94, 0.34);
  background: rgba(10, 34, 28, 0.75);
  color: var(--dps-ivory);
  padding: 0.45rem 0.6rem;
  min-height: 2.15rem;
}

.academic-tools button {
  cursor: pointer;
}

.academic-tools button:hover {
  background: rgba(198, 167, 94, 0.18);
}

#visibleCount {
  margin: 0;
  color: var(--dps-gold-soft);
  font-size: 0.88rem;
}

.academic-layout {
  margin-top: 0.95rem;
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 0.9rem;
}

.dept-nav {
  position: sticky;
  top: 5rem;
  align-self: start;
  border: 1px solid rgba(198, 167, 94, 0.3);
  background: rgba(22, 61, 51, 0.65);
  display: grid;
  gap: 0.35rem;
  padding: 0.55rem;
}

.dept-btn {
  border: 1px solid transparent;
  background: transparent;
  color: var(--dps-ivory);
  text-align: left;
  padding: 0.5rem;
  cursor: pointer;
  transition: all 240ms ease;
  position: relative;
  overflow: hidden;
}

.dept-btn::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  transform: translateX(-110%);
  background: linear-gradient(90deg, transparent, rgba(212, 184, 122, 0.85), rgba(154, 227, 200, 0.6), transparent);
  transition: transform 260ms ease;
  opacity: 0.85;
}

.dept-btn.active,
.dept-btn:hover,
.dept-btn:focus-visible {
  border-color: var(--dps-gold-accent);
  color: var(--dps-gold-soft);
}

.dept-btn.active::after,
.dept-btn:hover::after,
.dept-btn:focus-visible::after {
  transform: translateX(0);
}

.dept-content {
  border: 1px solid rgba(198, 167, 94, 0.3);
  background: rgba(10, 34, 28, 0.65);
  min-height: 26rem;
}

.gallery-layout .dept-content {
  min-height: 34rem;
}

.dept-panel {
  display: none;
  padding: 1rem;
}

.dept-panel.active {
  display: block;
  animation: revealPanel 520ms ease;
}

.dept-panel h2 {
  margin: 0 0 0.7rem;
  font-family: "Prata", serif;
  color: var(--dps-gold-soft);
}

.dept-intro {
  margin: -0.25rem 0 0.9rem;
  color: rgba(242, 241, 237, 0.86);
  line-height: 1.65;
  max-width: 72ch;
}

.gallery-wall {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.8rem;
  perspective: 1200px;
  position: relative;
}

.gallery-wall::before {
  content: "";
  position: absolute;
  inset: -0.7rem;
  background:
    radial-gradient(circle at 10% 15%, rgba(212, 184, 122, 0.12), transparent 42%),
    radial-gradient(circle at 90% 20%, rgba(154, 227, 200, 0.08), transparent 40%);
  opacity: 0.55;
  pointer-events: none;
}

.tile {
  --tile-rx: 0deg;
  --tile-ry: 0deg;
  --tile-z: 0px;
  --tile-mx: 50%;
  --tile-my: 50%;
  border: 1px solid rgba(198, 167, 94, 0.24);
  background: rgba(10, 34, 28, 0.74);
  position: relative;
  transform-style: preserve-3d;
  transform: translateY(10px) rotateX(var(--tile-rx)) rotateY(var(--tile-ry)) translateZ(var(--tile-z));
  transition: transform 280ms ease, border-color 280ms ease, box-shadow 280ms ease;
  opacity: 0;
  box-shadow: 0 10px 18px rgba(0, 0, 0, 0.3);
  overflow: hidden;
  margin: 0;
}

.tile::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0;
  background: radial-gradient(circle at var(--tile-mx) var(--tile-my), rgba(212, 184, 122, 0.2), transparent 56%);
  transition: opacity 260ms ease;
  pointer-events: none;
  transform: translateZ(1px);
  z-index: 1;
}

.tile::after {
  content: "";
  position: absolute;
  inset: -40% -10%;
  transform: rotate(9deg) translateX(-45%);
  background: linear-gradient(90deg, transparent, rgba(154, 227, 200, 0.14), rgba(212, 184, 122, 0.12), transparent);
  opacity: 0;
  transition: opacity 260ms ease;
  pointer-events: none;
  z-index: 1;
}

.tile.in-view {
  opacity: 1;
  transform: translateY(0) rotateX(var(--tile-rx)) rotateY(var(--tile-ry)) translateZ(var(--tile-z));
}

.tile:hover,
.tile:focus-visible {
  transform: translateY(-6px) rotateX(var(--tile-rx)) rotateY(var(--tile-ry)) translateZ(var(--tile-z));
  border-color: var(--dps-gold-accent);
  box-shadow: 0 20px 32px rgba(0, 0, 0, 0.42);
}

.tile:hover::before,
.tile:focus-visible::before {
  opacity: 1;
}

.tile:hover::after,
.tile:focus-visible::after {
  opacity: 1;
}

.tile img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.tile:hover img,
.tile:focus-visible img {
  transform: translateZ(30px) scale(1.06);
}

.tile-meta-badge {
  position: absolute;
  left: 0.45rem;
  bottom: 0.45rem;
  z-index: 2;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.22rem 0.35rem;
  background: rgba(10, 34, 28, 0.68);
  border: 1px solid rgba(198, 167, 94, 0.35);
  color: var(--dps-gold-soft);
}

.empty-state {
  border: 1px dashed rgba(198, 167, 94, 0.4);
  padding: 1.2rem;
  text-align: center;
  color: var(--dps-ivory-soft);
}

dialog {
  width: min(780px, 92vw);
  border: 1px solid rgba(198, 167, 94, 0.45);
  background: rgba(10, 34, 28, 0.95);
  color: var(--dps-ivory);
  padding: 0.8rem;
}

dialog::backdrop {
  background: rgba(0, 0, 0, 0.7);
}

.lightbox-controls {
  display: flex;
  gap: 0.45rem;
  margin-bottom: 0.55rem;
}

.lightbox-controls button {
  border: 1px solid rgba(198, 167, 94, 0.34);
  background: rgba(22, 61, 51, 0.62);
  color: var(--dps-ivory);
  padding: 0.4rem 0.5rem;
  cursor: pointer;
}

.lightbox-controls button:hover {
  color: var(--dps-gold-soft);
  background: rgba(198, 167, 94, 0.18);
}

#lightboxImage {
  width: 100%;
  max-height: 70vh;
  object-fit: contain;
}

#lightboxCaption,
#lightboxMeta {
  margin: 0.48rem 0 0;
  color: var(--dps-ivory-soft);
}

#lightboxMeta {
  color: var(--dps-gold-soft);
  font-size: 0.84rem;
}

.reduced-motion * {
  transition: none !important;
  animation: none !important;
}

@keyframes revealPanel {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 1080px) {
  .top-nav {
    grid-template-columns: auto 1fr auto;
  }

  .nav-toggle {
    display: inline-block;
    justify-self: end;
  }

  nav {
    grid-column: 1 / -1;
    display: none;
    justify-content: flex-start;
  }

  nav.open {
    display: flex;
  }

  .academic-layout {
    grid-template-columns: 1fr;
  }

  .dept-nav {
    position: static;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  }
}

@media (max-width: 840px) {
  .gallery-tools-panel {
    grid-template-columns: minmax(0, 1fr);
  }
}