/* ============================================================
   1. CSS Custom Properties
   ============================================================ */
:root {
  --bg:               #fafafa;
  --surface:          #ffffff;
  --border:           #e2e8f0;
  --text:             #0f172a;
  --text-muted:       #64748b;
  --skeleton:         #e2e8f0;
  --skeleton-shine:   #f1f5f9;
  --glass-bg:         rgba(250, 250, 250, 0.88);
  --glass-border:     rgba(0, 0, 0, 0.07);
  --lightbox-bg:      rgba(8, 10, 18, 0.95);
  --font:             'IBM Plex Serif', Georgia, serif;
  --font-sans:        'IBM Plex Sans', system-ui, sans-serif;
  --gap:              8px;
  --r-sm:             8px;
  --r-md:             12px;
  --r-full:           9999px;
  --t-fast:           150ms ease;
  --t-base:           300ms ease;
  --t-slow:           700ms cubic-bezier(0.22, 1, 0.36, 1);
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
  line-height: 1.6;
}

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

/* ============================================================
   3. Skeleton shimmer
   ============================================================ */
@keyframes shimmer {
  0%   { background-position: -200% 0; }
  100% { background-position:  200% 0; }
}

.skeleton {
  background: linear-gradient(
    90deg,
    var(--skeleton)       25%,
    var(--skeleton-shine) 50%,
    var(--skeleton)       75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.6s ease-in-out infinite;
}

/* Gallery placeholder cards */
.gallery-skeleton {
  border-radius: var(--r-md);
  aspect-ratio: 3 / 4;
}

.gallery-skeleton:nth-child(4n + 1) { aspect-ratio: 4 / 5; }
.gallery-skeleton:nth-child(4n + 2) { aspect-ratio: 2 / 3; }
.gallery-skeleton:nth-child(4n + 3) { aspect-ratio: 16 / 9; }
.gallery-skeleton:nth-child(4n)     { aspect-ratio: 3 / 4; }

/* ============================================================
   4. Floating Navigation
   ============================================================ */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 200;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.75rem 2.5rem;
  border-bottom: 1px solid transparent;
  transition:
    background 0.5s ease,
    padding 0.35s ease,
    border-color 0.5s ease;
}

.site-nav.past-hero {
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  padding: 1.1rem 2.5rem;
  border-color: var(--glass-border);
}

.nav-name {
  font-family: var(--font);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #ffffff;
  transition: color 0.5s ease;
}

.site-nav.past-hero .nav-name { color: var(--text); }


/* ============================================================
   5. Hero Section
   ============================================================ */
.hero {
  position: relative;
  height: 100dvh;
  min-height: 600px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  overflow: hidden;
  background: #080b14;
}

.hero-skeleton {
  position: absolute;
  inset: 0;
  border-radius: 0;
}

.hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  opacity: 0;
  transition: opacity 2.8s ease-in-out;
}

.hero-bg.is-active { opacity: 1; }

/* Film grain canvas — animated noise overlay for cinematic texture */
.hero-grain {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.21;
  mix-blend-mode: overlay;
  pointer-events: none;
  z-index: 1;
  /* let browser interpolate grain pixels for a smooth, natural texture */
  image-rendering: auto;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    rgba(0, 0, 0, 0.90) 0%,
    rgba(0, 0, 0, 0.30) 50%,
    rgba(0, 0, 0, 0.08) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 2;
  padding: 0 2.5rem 3.5rem;
  color: #ffffff;
  transition: opacity 1.5s ease;
}

.hero-idle .hero-content,
.hero-idle .scroll-indicator {
  opacity: 0;
  pointer-events: none;
}

.hero-name {
  font-size: clamp(3.5rem, 9vw, 9rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 0.9;
  margin-bottom: 1.25rem;
}

.hero-tagline {
  font-size: 1rem;
  font-weight: 300;
  font-style: italic;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 2.25rem;
  max-width: 38ch;
  min-height: 1.5em; /* prevent layout jump while loading */
}

.hero-stats {
  font-family: var(--font-sans);
  display: flex;
  align-items: center;
  gap: 2rem;
}

.hero-stat {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.hero-stat-link {
  text-decoration: none;
  transition: opacity 0.2s ease;
}

.hero-stat-link:hover { opacity: 0.7; }

.hero-stat-value {
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
  line-height: 1;
}

.hero-stat-label {
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.48);
}

.hero-stat-divider {
  width: 1px;
  height: 2rem;
  background: rgba(255, 255, 255, 0.18);
}

/* Fullscreen toggle button — lives in nav, aligned by nav flexbox */
.hero-fullscreen {
  font-family: var(--font-sans);
  padding: 0.35rem 1rem;
  border-radius: var(--r-full);
  background: rgba(255, 255, 255, 0.10);
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: #ffffff;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  transition: background var(--t-fast), border-color var(--t-fast), color var(--t-fast);
  opacity: 0.8;
}

.hero-fullscreen:hover { background: rgba(255, 255, 255, 0.20); border-color: rgba(255, 255, 255, 0.5); opacity: 1; }

.site-nav.past-hero .hero-fullscreen {
  color: var(--text);
  border-color: rgba(0, 0, 0, 0.18);
  background: transparent;
}

.site-nav.past-hero .hero-fullscreen:hover {
  background: rgba(0, 0, 0, 0.06);
  border-color: rgba(0, 0, 0, 0.35);
}

/* Hide all text overlays when hero is in fullscreen mode */
.hero:fullscreen .hero-content,
.hero:-webkit-full-screen .hero-content,
.hero:fullscreen .scroll-indicator,
.hero:-webkit-full-screen .scroll-indicator {
  display: none;
}

/* Nav fades out after idle in fullscreen */
.hero:fullscreen .site-nav,
.hero:-webkit-full-screen .site-nav {
  transition: opacity 1s ease;
}
.hero:fullscreen .site-nav.nav-idle,
.hero:-webkit-full-screen .site-nav.nav-idle {
  opacity: 0;
  pointer-events: none;
}

/* Animated scroll indicator */
.scroll-indicator {
  font-family: var(--font-sans);
  transition: opacity 1.5s ease;
  position: absolute;
  bottom: 2.5rem;
  right: 2.5rem;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  color: rgba(255, 255, 255, 0.45);
  writing-mode: vertical-rl;
  font-size: 0.6rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.scroll-line {
  width: 1px;
  height: 52px;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0.55), transparent);
  transform-origin: top;
  animation: scroll-drop 2.4s ease-in-out infinite;
}

@keyframes scroll-drop {
  0%   { transform: scaleY(0); opacity: 0; transform-origin: top; }
  35%  { transform: scaleY(1); opacity: 1; transform-origin: top; }
  65%  { transform: scaleY(1); opacity: 1; transform-origin: bottom; }
  100% { transform: scaleY(0); opacity: 0; transform-origin: bottom; }
}

/* ============================================================
   6. Gallery — CSS Grid, left-to-right order, natural aspect ratios
   ============================================================ */
main {
  padding: var(--gap);
}

.gallery {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-auto-rows: 4px; /* tiny base unit; JS sets span per item */
  gap: var(--gap);
}

/* ============================================================
   7. Gallery Items
   ============================================================ */
.gallery-item {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-md);
  cursor: pointer;
  background: var(--skeleton);

  /* aspect-ratio set inline by JS from photo.width / photo.height */

  /* Reveal: starts hidden, .is-visible added by IntersectionObserver */
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity var(--t-slow),
    transform var(--t-slow);
}

.gallery-item.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition:
    transform var(--t-slow),
    filter var(--t-base);
}

.gallery-item:hover img {
  transform: scale(1.07);
  filter: brightness(0.68);
}

/* Hover overlay — covers full item, dual gradient for top and bottom */
.item-info {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0.52) 0%,
    transparent 30%,
    transparent 65%,
    rgba(0, 0, 0, 0.72) 100%
  );
  color: #ffffff;
  opacity: 0;
  transition: opacity var(--t-base);
}

.gallery-item:hover .item-info { opacity: 1; }

.item-download {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  width: 34px;
  height: 34px;
  border-radius: var(--r-full);
  background: rgba(255, 255, 255, 0.16);
  color: #ffffff;
  font-size: 1rem;
  display: grid;
  place-items: center;
  transition: background var(--t-fast);
}

.item-download:hover { background: rgba(255, 255, 255, 0.32); }

.item-location {
  position: absolute;
  bottom: 0.75rem;
  left: 0.75rem;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  opacity: 0.9;
}

/* ============================================================
   8. Lightbox
   ============================================================ */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 500;
  display: grid;
  place-items: center;
  padding: 1.5rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--t-base);
}

.lightbox.is-open {
  opacity: 1;
  pointer-events: auto;
}

.lightbox-backdrop {
  position: absolute;
  inset: 0;
  background: var(--lightbox-bg);
  backdrop-filter: blur(10px) saturate(60%);
  -webkit-backdrop-filter: blur(10px) saturate(60%);
}

.lightbox-content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  max-width: min(92vw, 1200px);
  max-height: 92dvh;
  transform: scale(0.94);
  transition: transform var(--t-slow);
}

.lightbox.is-open .lightbox-content { transform: scale(1); }

.lightbox-img {
  border-radius: var(--r-md);
  max-height: calc(92dvh - 72px);
  max-width: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  box-shadow: 0 40px 100px rgba(0, 0, 0, 0.6);
  transition: opacity var(--t-fast);
}

.lightbox-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  gap: 1rem;
  padding: 0.5rem 0.75rem;
  background: rgba(255, 255, 255, 0.07);
  border-radius: var(--r-sm);
}

.lightbox-location {
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.6);
  font-style: italic;
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lightbox-meta-right {
  font-family: var(--font-sans);
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-shrink: 0;
}

.lightbox-counter {
  font-size: 0.72rem;
  color: rgba(255, 255, 255, 0.38);
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
}

.lightbox-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: #ffffff;
  padding: 0.3rem 1rem;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: var(--r-full);
  transition: background var(--t-fast), border-color var(--t-fast);
}

.lightbox-link:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.55);
}

.lightbox-stats {
  display: flex;
  gap: 1.25rem;
  align-items: center;
}

.lightbox-stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
  text-align: center;
}

.lightbox-stat-value {
  font-size: 0.85rem;
  font-weight: 700;
  color: #ffffff;
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.lightbox-stat-label {
  font-size: 0.56rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.42);
}

.lightbox-download {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: #ffffff;
  padding: 0.3rem 1rem;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: var(--r-full);
  transition: background var(--t-fast), border-color var(--t-fast);
}

.lightbox-download:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.55);
}

.lightbox-close {
  font-family: var(--font-sans);
  position: fixed;
  top: 1.75rem; right: 1.75rem;
  z-index: 2;
  width: 44px; height: 44px;
  border-radius: var(--r-full);
  background: rgba(255, 255, 255, 0.10);
  color: #ffffff;
  font-size: 1.05rem;
  display: grid;
  place-items: center;
  transition: background var(--t-fast);
}

.lightbox-close:hover { background: rgba(255, 255, 255, 0.22); }

.lightbox-arrow {
  position: fixed;
  top: 50%; transform: translateY(-50%);
  z-index: 2;
  width: 52px; height: 52px;
  border-radius: var(--r-full);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.14);
  color: #ffffff;
  display: grid;
  place-items: center;
  transition: background var(--t-fast), border-color var(--t-fast), transform var(--t-fast);
}

.lightbox-arrow:hover { background: rgba(255, 255, 255, 0.18); border-color: rgba(255, 255, 255, 0.32); }

.lightbox-prev { left:  1.75rem; }
.lightbox-next { right: 1.75rem; }
.lightbox-prev:hover { transform: translateY(-50%) translateX(-3px); }
.lightbox-next:hover { transform: translateY(-50%) translateX(3px); }

/* ============================================================
   9. Footer
   ============================================================ */
.site-footer {
  font-family: var(--font-sans);
  padding: 2.5rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
}

/* ============================================================
   10. Responsive
   ============================================================ */
@media (max-width: 1100px) {
  .gallery { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
  :root { --gap: 6px; }
  .gallery { grid-template-columns: repeat(2, 1fr); }
  .hero-content { padding: 0 1.5rem 3rem; }
  .scroll-indicator { display: none; }
  .site-nav { padding: 1.25rem 1.5rem; }
  .site-nav.past-hero { padding: 0.9rem 1.5rem; }
}

@media (max-width: 480px) {
  :root { --gap: 4px; }
  .gallery { grid-template-columns: 1fr; }
  .lightbox-arrow { display: none; }
  .lightbox-close { top: 1rem; right: 1rem; }
  /* Stack meta vertically so stats and buttons both have room */
  #nav-unsplash { display: none; }
  .hero-stats .hero-stat-divider:last-of-type { display: none; }
  .lightbox-meta { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
  .lightbox-meta-right { flex-wrap: wrap; width: 100%; align-items: center; }
  /* Push icon buttons to the right; link follows naturally */
  .lightbox-download { margin-left: auto; }
  .lightbox-counter { display: none; }
  /* Icon-only buttons on mobile */
  .lightbox-download .btn-label,
  .lightbox-link .btn-label { display: none; }
}