/* =============================================================================
   Photo Gallery — main.css
   -----------------------------------------------------------------------------
   Design concept: "contact sheet in a darkroom".
   - Near-black canvas so photos carry full contrast and color.
   - A tight condensed display face for titles/folder labels (the kind of
     face stamped on film boxes / contact sheets), paired with a quiet
     humanist sans for body copy.
   - EXIF data rendered in monospace, like metadata burned into a frame edge.
   - Pure, almost-touching square grid -- the floor is the photos themselves.
   - One signature accent: a warm amber "safelight" color used sparingly for
     hover/focus states, evoking a darkroom safelight glow.
   ========================================================================== */

:root {
  --bg: #0e0e0e;
  --bg-raised: #161616;
  --ink: #f1eee7;
  --ink-dim: #9b968c;
  --line: #2a2a2a;
  --accent: #d08a4a;       /* darkroom safelight amber */
  --accent-dim: #8a5d34;
  --overlay: rgba(10, 9, 8, 0.82);

  --header-bg: rgba(14, 14, 14, 0.92);
  --gradient-folder: linear-gradient(to top, rgba(0,0,0,0.75) 0%, rgba(0,0,0,0) 55%);
  --gradient-photo: linear-gradient(to top, rgba(0,0,0,0.65) 0%, rgba(0,0,0,0) 60%);
  --lightbox-bg: rgba(8, 7, 6, 0.97);
  --exif-pill-bg: rgba(0,0,0,0.4);
  --nav-bg: rgba(0,0,0,0.3);
  --nav-hover-bg: rgba(0,0,0,0.55);

  --font-display: "Archivo Narrow", "Oswald", "Helvetica Neue", Arial, sans-serif;
  --font-body: "Inter", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --grid-gap: 4px;
  --max-width: 1440px;
}

:root.ivory-mode {
  --bg: #f5f0e8;
  --bg-raised: #ede8e0;
  --ink: #1c1c1c;
  --ink-dim: #6b655c;
  --line: #d4cec4;
  --accent: #c47a3a;
  --accent-dim: #a06030;
  --overlay: rgba(245, 240, 232, 0.82);

  --header-bg: rgba(245, 240, 232, 0.92);
  --gradient-folder: linear-gradient(to top, rgba(245,240,232,0.85) 0%, rgba(245,240,232,0) 55%);
  --gradient-photo: linear-gradient(to top, rgba(245,240,232,0.75) 0%, rgba(245,240,232,0) 60%);
  --lightbox-bg: rgba(245, 240, 232, 0.97);
  --exif-pill-bg: rgba(255,255,255,0.5);
  --nav-bg: rgba(255,255,255,0.5);
  --nav-hover-bg: rgba(200,200,200,0.7);
}

@font-face {
  font-family: "Archivo Narrow";
  src: local("Archivo Narrow");
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

::selection {
  background: var(--accent-dim);
  color: var(--ink);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ---------------------------------------------------------------------------
   Header
   ------------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--header-bg);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.site-header__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
}

.site-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 20px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  gap: 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.site-nav a {
  color: var(--ink-dim);
  transition: color 0.15s ease;
}

.site-nav a:hover {
  color: var(--accent);
}

/* ---------------------------------------------------------------------------
   Gallery page header
   ------------------------------------------------------------------------- */

.gallery-page {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 32px 24px 64px;
}

.gallery-breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-bottom: 18px;
}

.gallery-breadcrumb a {
  color: var(--ink-dim);
  transition: color 0.15s ease;
}

.gallery-breadcrumb a:hover {
  color: var(--accent);
}

.gallery-breadcrumb__sep {
  margin: 0 8px;
  color: var(--line);
}

.gallery-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(28px, 5vw, 48px);
  letter-spacing: 0.01em;
  margin: 0 0 4px;
  text-transform: uppercase;
}

.gallery-count {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-dim);
  margin: 0 0 28px;
}

.gallery-empty {
  color: var(--ink-dim);
  font-size: 14px;
  padding: 48px 0;
}

.gallery-empty code {
  font-family: var(--font-mono);
  background: var(--bg-raised);
  padding: 2px 6px;
  border-radius: 3px;
}

/* ---------------------------------------------------------------------------
   Square grid
   ------------------------------------------------------------------------- */

.square-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: var(--grid-gap);
}

@media (min-width: 700px) {
  .square-grid {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  }
}

.square {
  position: relative;
  display: block;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  background: var(--bg-raised);
  cursor: pointer;
}

.square__inner {
  position: absolute;
  inset: 0;
}

.square__inner img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s cubic-bezier(0.2, 0.7, 0.2, 1), filter 0.4s ease;
}

.square:hover .square__inner img {
  transform: scale(1.06);
  filter: brightness(0.55);
}

.square__overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 14px;
  opacity: 0;
  transition: opacity 0.25s ease;
  pointer-events: none;
}

.square:hover .square__overlay {
  opacity: 1;
}

.square__overlay--folder {
  background: var(--gradient-folder);
  justify-content: center;
  align-items: center;
  text-align: center;
  opacity: 1; /* folders always show their label, not just on hover */
}

.square--folder .square__inner img {
  filter: brightness(0.45) saturate(0.7);
}

.square--folder:hover .square__inner img {
  filter: brightness(0.3) saturate(0.7);
}

.square__empty-folder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-dim);
  background: var(--bg-raised);
}

.square__folder-icon {
  display: block;
  margin-bottom: 8px;
  color: var(--accent);
}

.square__label {
  display: block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 17px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--ink);
}

.square__sublabel {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-dim);
  margin-top: 4px;
}

.square__overlay--photo {
  background: var(--gradient-photo);
}

.square__exif-pill {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.02em;
  color: var(--ink);
  background: var(--exif-pill-bg);
  padding: 4px 8px;
  border-radius: 3px;
  align-self: flex-start;
}

/* ---------------------------------------------------------------------------
   Lightbox
   ------------------------------------------------------------------------- */

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: var(--lightbox-bg);
  display: none;
  grid-template-columns: 1fr;
  grid-template-rows: 1fr auto;
}

.lightbox.is-open {
  display: grid;
}

.lightbox__stage {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 8px 8px 4px;
  min-height: 0;
}

.lightbox__zoom-wrap {
  position: relative;
  max-width: 100%;
  max-height: 100%;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: zoom-in;
}

.lightbox__zoom-wrap.is-zoomed {
  cursor: zoom-out;
}

.lightbox__image {
  max-width: 100%;
  max-height: calc(100vh - 130px);
  width: auto;
  height: auto;
  object-fit: contain;
  transition: transform 0.25s ease;
  transform-origin: center center;
  user-select: none;
}

.lightbox__zoom-wrap.is-zoomed .lightbox__image {
  transform: scale(4);
  transition: transform 0.15s ease-out;
}

.lightbox__hint {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin: 14px 0 0;
  opacity: 0.7;
}

.lightbox__close {
  position: absolute;
  top: 18px;
  right: 22px;
  z-index: 5;
  background: none;
  border: none;
  color: var(--ink);
  font-size: 32px;
  line-height: 1;
  cursor: pointer;
  padding: 4px 10px;
  transition: color 0.15s ease;
}

.lightbox__close:hover {
  color: var(--accent);
}

.lightbox__nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 5;
  background: var(--nav-bg);
  border: none;
  color: var(--ink);
  font-size: 36px;
  line-height: 1;
  width: 52px;
  height: 64px;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.lightbox__nav:hover {
  background: var(--nav-hover-bg);
  color: var(--accent);
}

.lightbox__nav--prev {
  left: 0;
  border-radius: 0 4px 4px 0;
}

.lightbox__nav--next {
  right: 0;
  border-radius: 4px 0 0 4px;
}

.lightbox__info {
  border-top: 1px solid var(--line);
  background: var(--bg-raised);
  padding: 16px 28px 22px;
  max-height: 22vh;
  overflow-y: auto;
}

.lightbox__description {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.5;
  color: var(--ink);
  margin: 0 0 14px;
  max-width: 720px;
}

.lightbox__description:empty {
  display: none;
}

.lightbox__exif {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 10px 24px;
  margin: 0;
}

.lightbox__exif-item {
  display: none; /* shown via JS only when it has a value */
}

.lightbox__exif-item.has-value {
  display: block;
}

.lightbox__exif-item dt {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin: 0 0 2px;
}

.lightbox__exif-item dd {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent);
  margin: 0;
}

/* ---------------------------------------------------------------------------
   Footer
   ------------------------------------------------------------------------- */

.site-footer {
  text-align: center;
  padding: 32px 24px 48px;
  color: var(--ink-dim);
  font-family: var(--font-mono);
  font-size: 12px;
}

/* ---------------------------------------------------------------------------
   Reduced motion
   ------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  .square__inner img,
  .square__overlay,
  .lightbox__image {
    transition: none !important;
  }
}

/* ---------------------------------------------------------------------------
   Small screens: stack lightbox controls sensibly, simplify nav buttons
   ------------------------------------------------------------------------- */

@media (max-width: 600px) {
  .lightbox__nav {
    width: 40px;
    height: 52px;
    font-size: 28px;
  }

  .lightbox__info {
    padding: 14px 16px 18px;
  }

  .site-nav {
    gap: 12px;
  }
}

/* Hero CTA button */
.hero-btn {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid var(--accent);
  color: var(--accent);
  padding: 12px 28px;
  transition: background 0.2s ease, color 0.2s ease;
  display: inline-block;
}
.hero-btn:hover {
  background: var(--accent);
  color: var(--bg);
}

/* Footer inner (index page — copyright + theme toggle side by side) */
.site-footer__inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* ---------------------------------------------------------------------------
   Theme toggle switch (index page only)
   ------------------------------------------------------------------------- */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-dim);
  cursor: pointer;
  user-select: none;
}

.theme-toggle__switch {
  position: relative;
  display: inline-block;
  width: 36px;
  height: 18px;
  flex-shrink: 0;
}

.theme-toggle__switch input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}

.theme-toggle__track {
  position: absolute;
  inset: 0;
  background: var(--line);
  border-radius: 18px;
  transition: background 0.2s ease;
}

.theme-toggle__knob {
  position: absolute;
  width: 14px;
  height: 14px;
  left: 2px;
  bottom: 2px;
  background: var(--ink);
  border-radius: 50%;
  transition: transform 0.2s ease, background 0.2s ease;
}

.theme-toggle__switch:has(input:checked) .theme-toggle__track {
  background: var(--accent);
}

.theme-toggle__switch:has(input:checked) .theme-toggle__knob {
  transform: translateX(18px);
}