/* ============================================================
   GALLERY.CSS — Gusti Tanati Photo Archive
   Design Language: Dark Editorial Documentary
   ============================================================ */

/* ── Custom Properties ─────────────────────────────────────── */
:root {
  --c-bg:          #0c0c0c;
  --c-bg-2:        #111111;
  --c-bg-3:        #181818;
  --c-surface:     #1a1a1a;
  --c-border:      #2a2a2a;
  --c-border-soft: #222222;

  --c-text:        #ece9e4;
  --c-text-muted:  #888880;
  --c-text-dim:    #555550;

  --c-accent:      #9b1c1c;
  --c-accent-dark: #7a1515;
  --c-accent-glow: rgba(155, 28, 28, 0.18);

  --f-serif:       'Playfair Display', Georgia, serif;
  --f-sans:        'Inter', system-ui, sans-serif;

  --sidebar-w:     260px;
  --nav-h:         60px;

  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-smooth:   cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Reset & Base ───────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--f-sans);
  font-size: 15px;
  line-height: 1.6;
  overflow-x: hidden;
}

img { display: block; max-width: 100%; }
a { text-decoration: none; color: inherit; }
button { border: none; background: none; cursor: pointer; font-family: inherit; }

/* ── Navigation ─────────────────────────────────────────────── */
.gt-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 900;
  height: var(--nav-h);
  background: rgba(12, 12, 12, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-border-soft);
  transition: background 0.3s var(--ease-smooth);
}
.gt-nav.scrolled {
  background: rgba(12, 12, 12, 0.98);
}
.gt-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-h);
}
.gt-nav-logo {
  font-family: var(--f-serif);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--c-text);
  transition: color 0.2s;
}
.gt-nav-logo:hover { color: var(--c-accent); }

.gt-nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}
.gt-nav-links a {
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-text-muted);
  transition: color 0.2s;
  position: relative;
}
.gt-nav-links a::after {
  content: '';
  position: absolute;
  bottom: -3px; left: 0; right: 0;
  height: 1px;
  background: var(--c-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s var(--ease-smooth);
}
.gt-nav-links a:hover,
.gt-nav-links a.active {
  color: var(--c-text);
}
.gt-nav-links a.active::after,
.gt-nav-links a:hover::after {
  transform: scaleX(1);
}

/* Hamburger */
.gt-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}
.gt-hamburger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--c-text-muted);
  transition: all 0.25s var(--ease-smooth);
}
.gt-hamburger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.gt-hamburger.open span:nth-child(2) { opacity: 0; }
.gt-hamburger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* Mobile Menu */
.gt-mobile-menu {
  display: none;
  flex-direction: column;
  background: var(--c-bg-2);
  border-top: 1px solid var(--c-border);
  padding: 1rem 0;
}
.gt-mobile-menu.open { display: flex; }
.gt-mobile-menu a {
  padding: 0.7rem 1.5rem;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-text-muted);
  transition: color 0.2s, background 0.2s;
}
.gt-mobile-menu a:hover,
.gt-mobile-menu a.active {
  color: var(--c-text);
  background: var(--c-bg-3);
}

/* ── Hero ───────────────────────────────────────────────────── */
.gt-hero {
  position: relative;
  height: 70vh;
  min-height: 480px;
  display: flex;
  align-items: flex-end;
  padding-bottom: 5rem;
  overflow: hidden;
}
@media (min-width: 769px) {
  .gt-hero {
    height: 52vh;
    min-height: 400px;
    padding-bottom: 3.5rem;
  }
}
.gt-hero-bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, #1a0505 0%, #0c0c0c 40%, #111820 100%);
  /* Hero bg image: place hero.jpg in images/ and uncomment below */
  /* background-image: url('images/hero-gallery.jpg');
     background-size: cover;
     background-position: center; */
}

/* Grain texture overlay */
.gt-hero-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='1'/%3E%3C/svg%3E");
  opacity: 0.04;
  mix-blend-mode: overlay;
}

.gt-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    rgba(12, 12, 12, 1) 0%,
    rgba(12, 12, 12, 0.65) 50%,
    rgba(12, 12, 12, 0.3) 100%
  );
}

.gt-hero-content {
  position: relative;
  z-index: 2;
  padding-left: 5vw;
  max-width: 780px;
}

.gt-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.4rem;
}
.gt-breadcrumb a {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-text-dim);
  transition: color 0.2s;
}
.gt-breadcrumb a:hover { color: var(--c-accent); }
.gt-breadcrumb-sep {
  font-size: 0.72rem;
  color: var(--c-text-dim);
}
.gt-breadcrumb span:last-child {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-text-muted);
}

.gt-hero-title {
  font-family: var(--f-serif);
  font-size: clamp(2.8rem, 6vw, 4.8rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--c-text);
  margin-bottom: 1.1rem;
}
@media (min-width: 769px) {
  .gt-hero-title {
    font-size: clamp(2.4rem, 4.2vw, 3.4rem);
    margin-bottom: 1rem;
  }
}
.gt-hero-title em {
  font-style: italic;
  font-weight: 400;
  color: var(--c-accent);
}

.gt-hero-sub {
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--c-text-muted);
  max-width: 560px;
  font-weight: 300;
}

/* Scroll indicator */
.gt-hero-scroll-indicator {
  position: absolute;
  bottom: 1.8rem;
  right: 2.5rem;
  z-index: 2;
}
.gt-hero-scroll-indicator span {
  display: block;
  width: 1px;
  height: 44px;
  background: linear-gradient(to bottom, transparent, var(--c-accent));
  animation: scrollLine 1.8s ease-in-out infinite;
}
@keyframes scrollLine {
  0%   { transform: scaleY(0); transform-origin: top; opacity: 0; }
  50%  { transform: scaleY(1); transform-origin: top; opacity: 1; }
  100% { transform: scaleY(0); transform-origin: bottom; opacity: 0; }
}

/* ── Gallery Main Layout ────────────────────────────────────── */
.gt-gallery-main {
  background: var(--c-bg);
  min-height: 100vh;
}

/* Mobile Project Nav */
.gt-project-nav-mobile {
  display: block;
  background: var(--c-bg-2);
  border-bottom: 1px solid var(--c-border);
  position: sticky;
  top: var(--nav-h);
  z-index: 80;
  overflow-x: auto;
  scrollbar-width: none;
}

/* Sembunyikan sidebar lama tanpa hapus elemen (JS tetap aman) */
.gt-sidebar-hidden {
  display: none;
}
.gt-gallery-layout-full {
  display: block;
}
.gt-project-nav-mobile::-webkit-scrollbar { display: none; }
.gt-project-nav-mobile-inner {
  display: flex;
  gap: 0.7rem;
  padding: 0.9rem 1.2rem;
  white-space: nowrap;
  min-width: max-content;
}
.gt-project-nav-btn {
  padding: 0.65rem 1.3rem;
  font-size: 0.73rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--c-text-muted);
  background: transparent;
  border: 1px solid var(--c-border);
  border-radius: 999px;
  transition: color 0.2s, background 0.2s, border-color 0.2s;
  white-space: nowrap;
  flex-shrink: 0;
}
.gt-project-nav-btn:hover {
  color: var(--c-text);
  border-color: var(--c-text-dim);
}
.gt-project-nav-btn.active {
  color: #fff;
  background: var(--c-accent);
  border-color: var(--c-accent);
  font-weight: 600;
}

/* Desktop: nav lebih lega & center, tapi tetap horizontal-scroll kalau kategori banyak */
@media (min-width: 769px) {
  .gt-project-nav-top {
    overflow-x: visible;
  }
  .gt-project-nav-top .gt-project-nav-mobile-inner {
    flex-wrap: wrap;
    justify-content: flex-start;
    padding: 1rem 2.5rem;
    gap: 0.8rem;
    min-width: 0;
    white-space: normal;
  }
  .gt-project-nav-top .gt-project-nav-btn {
    padding: 0.7rem 1.5rem;
    font-size: 0.76rem;
    white-space: nowrap;
  }
}
.gt-project-nav-btn:hover {
  color: var(--c-text-muted);
}
.gt-project-nav-btn.active {
  color: var(--c-text);
  border-bottom-color: var(--c-accent);
}

/* Layout flex */
.gt-gallery-layout {
  display: flex;
  align-items: flex-start;
  min-height: 100vh;
}

/* ── Sidebar ────────────────────────────────────────────────── */
.gt-sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  position: sticky;
  top: var(--nav-h);
  height: calc(100vh - var(--nav-h));
  overflow-y: auto;
  border-right: 1px solid var(--c-border-soft);
  scrollbar-width: thin;
  scrollbar-color: var(--c-border) transparent;
}
.gt-sidebar::-webkit-scrollbar { width: 4px; }
.gt-sidebar::-webkit-scrollbar-track { background: transparent; }
.gt-sidebar::-webkit-scrollbar-thumb { background: var(--c-border); border-radius: 2px; }

.gt-sidebar-inner {
  padding: 2.5rem 0 2rem;
}

.gt-sidebar-label {
  font-size: 0.65rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-text-dim);
  padding: 0 1.6rem;
  margin-bottom: 1.2rem;
}

.gt-project-list {
  list-style: none;
}
.gt-project-list li {
  position: relative;
}
.gt-project-btn {
  width: 100%;
  text-align: left;
  padding: 0.85rem 1.6rem 0.85rem 2rem;
  color: var(--c-text-muted);
  font-size: 0.82rem;
  line-height: 1.45;
  font-weight: 400;
  transition: color 0.2s, background 0.2s;
  position: relative;
}
.gt-project-btn::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0; bottom: 0;
  width: 2px;
  background: var(--c-accent);
  transform: scaleY(0);
  transform-origin: bottom;
  transition: transform 0.3s var(--ease-out-expo);
}
.gt-project-btn:hover {
  color: var(--c-text);
  background: rgba(255,255,255,0.02);
}
.gt-project-btn.active {
  color: var(--c-text);
  background: rgba(155, 28, 28, 0.06);
}
.gt-project-btn.active::before {
  transform: scaleY(1);
}
.gt-project-btn-title {
  display: block;
  font-weight: 500;
}
.gt-project-btn-period {
  display: block;
  font-size: 0.72rem;
  color: var(--c-text-dim);
  margin-top: 0.2rem;
  font-style: italic;
}

/* ── Gallery Area ───────────────────────────────────────────── */
.gt-gallery-area {
  flex: 1;
  min-width: 0;
  padding: 0;
}

/* Project Header */
.gt-project-header {
  padding: 2rem 2.5rem 1.6rem;
  border-bottom: 1px solid var(--c-border-soft);
  position: relative;
  background: transparent;
}
.gt-project-header-inner {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.gt-project-title {
  font-family: var(--f-serif);
  font-size: clamp(1.4rem, 3vw, 2.1rem);
  font-weight: 600;
  color: var(--c-text);
  line-height: 1.15;
}
.gt-project-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-shrink: 0;
}
.gt-photo-count {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-accent);
  font-weight: 500;
}
.gt-project-period {
  font-size: 0.75rem;
  color: var(--c-text-dim);
  font-style: italic;
}

/* Loading */
.gt-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
  padding: 4rem;
}
.gt-loading-inner {
  width: 120px;
}
.gt-loading-bar {
  width: 100%;
  height: 1px;
  background: var(--c-border);
  position: relative;
  overflow: hidden;
}
.gt-loading-bar span {
  position: absolute;
  top: 0; left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(to right, transparent, var(--c-accent), transparent);
  animation: loadingSlide 1.2s ease-in-out infinite;
}
@keyframes loadingSlide {
  from { left: -100%; }
  to   { left: 100%; }
}

/* Empty state */
.gt-empty {
  padding: 5rem 2.5rem;
  text-align: center;
  color: var(--c-text-dim);
  font-size: 0.85rem;
  line-height: 1.8;
}
.gt-empty code {
  font-family: 'Courier New', monospace;
  font-size: 0.8rem;
  color: var(--c-text-muted);
  background: var(--c-bg-3);
  padding: 0.1em 0.4em;
  border-radius: 2px;
}

/* ── Masonry Grid ───────────────────────────────────────────── */
.gt-masonry {
  columns: 4;
  column-gap: 3px;
  padding: 3px;
}
.gt-masonry-item {
  break-inside: avoid;
  position: relative;
  overflow: hidden;
  margin-bottom: 3px;
  cursor: pointer;
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity 0.5s var(--ease-out-expo),
    transform 0.5s var(--ease-out-expo);
}
.gt-masonry-item.visible {
  opacity: 1;
  transform: translateY(0);
}
.gt-masonry-item img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.5s var(--ease-out-expo), filter 0.3s;
  filter: brightness(0.92);
}
.gt-masonry-item:hover img {
  transform: scale(1.035);
  filter: brightness(1);
}
/* Placeholder while image loads */
.gt-masonry-item.placeholder {
  background: var(--c-bg-3);
  min-height: 200px;
}

/* Load more trigger */
.gt-load-more-trigger {
  height: 60px;
  width: 100%;
}

/* ── Lightbox ───────────────────────────────────────────────── */
.gt-lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s var(--ease-smooth);
}
.gt-lightbox.open {
  opacity: 1;
  pointer-events: all;
}

.gt-lightbox-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.96);
  cursor: pointer;
}

/* Stage */
.gt-lb-stage {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: calc(100vw - 140px);
  max-height: calc(100vh - 100px);
}
.gt-lb-img-wrap {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  max-width: 100%;
  max-height: calc(100vh - 150px);
  overflow: hidden;
}
.gt-lb-img-wrap::before {
  content: '';
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
#gtLbImg {
  max-width: 100%;
  max-height: calc(100vh - 150px);
  object-fit: contain;
  display: block;
  opacity: 0;
  transform: scale(0.97);
  transition: opacity 0.28s var(--ease-smooth), transform 0.28s var(--ease-smooth);
  box-shadow: 0 40px 120px rgba(0,0,0,0.7);
}
#gtLbImg.loaded {
  opacity: 1;
  transform: scale(1);
}

.gt-lb-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 1rem 0 0;
  gap: 1rem;
}
.gt-lb-project-name {
  font-family: var(--f-serif);
  font-size: 0.85rem;
  font-style: italic;
  color: var(--c-text-muted);
}
.gt-lb-counter {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--c-text-dim);
  font-weight: 500;
  flex-shrink: 0;
}

/* Nav Buttons */
.gt-lb-prev,
.gt-lb-next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 3;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.5);
  transition: color 0.2s;
}
.gt-lb-prev { left: 12px; }
.gt-lb-next { right: 12px; }
.gt-lb-prev:hover,
.gt-lb-next:hover { color: var(--c-text); }
.gt-lb-prev svg,
.gt-lb-next svg { width: 28px; height: 28px; }

/* Close */
.gt-lb-close {
  position: absolute;
  top: 1.2rem;
  right: 1.5rem;
  z-index: 3;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.4);
  transition: color 0.2s;
}
.gt-lb-close:hover { color: var(--c-text); }
.gt-lb-close svg { width: 22px; height: 22px; }

/* ── Footer ─────────────────────────────────────────────────── */
.gt-footer {
  background: var(--c-bg-2);
  border-top: 1px solid var(--c-border-soft);
  padding: 2rem 0;
  margin-top: 4rem;
}
.gt-footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.gt-footer-name {
  font-family: var(--f-serif);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--c-text-muted);
}
.gt-footer-copy {
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--c-text-dim);
}

/* ── Responsive ─────────────────────────────────────────────── */

/* Tablet: 3 columns */
@media (max-width: 1100px) {
  :root { --sidebar-w: 220px; }
  .gt-masonry { columns: 3; }
}

/* Tablet smaller */
@media (max-width: 900px) {
  :root { --sidebar-w: 200px; }
  .gt-project-header { padding: 1.8rem 1.5rem 1.4rem; }
  .gt-masonry { columns: 3; }
}

/* Mobile: hide sidebar, show top nav */
@media (max-width: 768px) {
  .gt-hamburger { display: flex; }
  .gt-nav-links { display: none; }
  .gt-project-nav-mobile { display: block; }
  .gt-masonry { columns: 2; }
  .gt-project-header {
    padding: 1.2rem 1rem 1rem;
  }
  .gt-project-header-inner { flex-direction: column; gap: 0.4rem; }
  .gt-lb-stage { max-width: calc(100vw - 80px); }
  .gt-lb-prev { left: 4px; }
  .gt-lb-next { right: 4px; }
}

@media (max-width: 480px) {
  .gt-hero { height: 55vh; min-height: 380px; padding-bottom: 3.5rem; }
  .gt-hero-content { padding-left: 1.2rem; padding-right: 1.2rem; }
  .gt-hero-sub { font-size: 0.82rem; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}