/* ── Lightbox shell ─────────────────────────────────── */
#lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: stretch;
  justify-content: center;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch; /* smooth scroll on iOS Safari */
}

#lightbox[hidden] { display: none; }

/* Full-screen dim — fixed so it stays put during mobile scroll */
.lightbox__backdrop {
  position: fixed;
  inset: 0;
  background: var(--overlay);
  cursor: zoom-out;
}

/* ── Two-column layout ──────────────────────────────── */
.lightbox__layout {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: stretch;
  width: 100%;
  max-width: 1400px;
  padding: 64px 56px 48px;
  gap: 48px;
  min-height: 100%;
}

/* ── Left: photo ────────────────────────────────────── */
.lightbox__photo-col {
  flex: 1;
  min-width: 0;               /* prevent flex overflow */
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox__print {
  transform-origin: center center;
  box-shadow:
    0 4px 14px   rgba(0, 0, 0, 0.65),
    0 24px 64px  rgba(0, 0, 0, 0.55),
    0 60px 130px rgba(0, 0, 0, 0.35);
}

.lightbox__print img {
  display: block;
  max-width: 100%;
  max-height: calc(100vh - 128px);
  width: auto;
  height: auto;
  transition: opacity var(--dur-med) ease;
}

/* ── Right: meta panel ──────────────────────────────── */
.lightbox__meta-col {
  width: 280px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;           /* contains child overflow so photo is never affected */
}

/* Panels wrapper — flex column so meta-top can grow and push meta-bottom down */
.lightbox__meta-panels {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Description lives at the top, scrolls if long.
   min-height: 0 is required — without it flex children grow to content
   size and overflow-y: auto never triggers. */
.lightbox__meta-top {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(var(--accent-rgb), 0.15) transparent;
}

.lightbox__title {
  font-family: var(--font-ibm-sans);
  font-size: var(--text-md);
  color: var(--on-dark);
  margin: 0 0 10px;
  line-height: 1.5;
}

.lightbox__title[hidden],
.lightbox__description[hidden],
.lightbox__exif[hidden] {
  display: none;
}

.lightbox__description {
  font-family: var(--font-serif);
  font-size: var(--text-base);
  line-height: 1.8;
  color: var(--paper-body);
  white-space: pre-wrap;
}

/* EXIF + footer pushed to bottom of panel */
.lightbox__meta-bottom {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--accent-subtle);
  flex-shrink: 0;
}

.lightbox__exif {
  padding-bottom: 4px;
}

.exif-grid {
  display: grid;
  grid-template-columns: 5.5em 1fr;
  row-gap: 5px;
  column-gap: 10px;
  font-family: var(--font-mono-read);
  font-size: var(--text-sm);
  letter-spacing: 0.03em;
}

.exif-grid dt {
  color: rgba(var(--accent-rgb), 0.45);
  text-transform: uppercase;
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  padding-top: 1px;
}

.exif-grid dd {
  color: var(--accent-body);
  overflow-wrap: break-word;
  min-width: 0;
}

.lightbox__footer {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: var(--text-sm);
  color: var(--accent-ui);
  font-family: var(--font-mono-read);
  letter-spacing: 0.06em;
}

.lightbox__footer a {
  color: rgba(var(--accent-rgb), 0.75);
  text-decoration: none;
  border-bottom: 1px solid var(--accent-border);
  align-self: flex-start;
  transition: color var(--dur-fast), border-color var(--dur-fast);
}

.lightbox__footer a:hover {
  color: var(--on-dark);
  border-bottom-color: var(--accent-ui);
}

/* ── Nav: arrows + counter at foot of right panel ───── */
.lightbox__nav {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--accent-faint);
}

.lightbox__counter {
  font-family: var(--font-mono-read);
  font-size: var(--text-sm);
  color: var(--accent-dim);
  letter-spacing: 0.1em;
}

.lightbox__prev,
.lightbox__next {
  background: none;
  border: none;
  color: var(--paper-dim);
  cursor: pointer;
  font-size: var(--text-2xl);
  line-height: 1;
  padding: 4px 6px;
  transition: color var(--dur-fast) ease;
}

.lightbox__prev:hover,
.lightbox__next:hover {
  color: var(--paper-strong);
}

.lightbox__prev:disabled,
.lightbox__next:disabled {
  opacity: 0.12;
  cursor: default;
  pointer-events: none;
}

/* ── Share + Download actions ───────────────────────── */
.lightbox__actions {
  display: flex;
  gap: 8px;
  margin-top: 10px;
}

.lightbox__action-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: none;
  border: 1px solid var(--accent-border);
  color: var(--accent-ui);
  font-family: var(--font-mono-read);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 4px 10px;
  cursor: pointer;
  text-decoration: none;
  transition: color var(--dur-fast), border-color var(--dur-fast);
  line-height: 1.6;
}

.lightbox__action-btn:hover {
  color: var(--on-dark);
  border-color: var(--accent-ui);
}

/* ── Close button ───────────────────────────────────── */
.lightbox__close {
  position: fixed;
  top: 16px;
  right: 20px;
  z-index: 2;
  background: none;
  border: none;
  color: var(--paper-faint);
  font-size: var(--text-xl);
  line-height: 1;
  padding: 10px;
  cursor: pointer;
  transition: color var(--dur-fast) ease;
}

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

/* ── Tabs (mobile only) ─────────────────────────────── */
.lightbox__tabs {
  display: none;
}

/* ── Mobile: fixed zones, tab-toggled meta ──────────── */
@media (max-width: 680px) {
  /* Lightbox fills the viewport exactly — no scroll on the outer shell */
  #lightbox {
    align-items: stretch;
    overflow: hidden;
  }

  .lightbox__layout {
    flex-direction: column;
    align-items: stretch;
    padding: 0;
    gap: 0;
    height: 100dvh;           /* fill full viewport */
    height: 100vh;            /* fallback */
  }

  /* ── Photo: fills remaining space above meta ── */
  .lightbox__photo-col {
    flex: 1;
    min-height: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 60px 16px 12px;  /* 60px top clears the close button */
    overflow: hidden;
  }

  .lightbox__print {
    max-height: 100%;
    display: flex;
    align-items: center;
  }

  .lightbox__print img {
    max-height: 100%;
    max-width: 100%;
  }

  /* ── Tabs ── */
  .lightbox__tabs {
    display: flex;
    flex: 0 0 auto;
    border-top:    1px solid var(--accent-faint);
    border-bottom: 1px solid var(--accent-faint);
  }

  .lightbox__tab-btn {
    flex: 1;
    padding: 10px 0;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: rgba(var(--accent-rgb), 0.4);
    font-family: var(--font-mono-read);
    font-size: var(--text-xs);
    letter-spacing: 0.14em;
    text-transform: uppercase;
    cursor: pointer;
    transition: color var(--dur-fast), border-color var(--dur-fast);
  }

  .lightbox__tab-btn.is-active {
    color: var(--accent);
    border-bottom-color: var(--accent);
  }

  /* ── Meta col ── */
  .lightbox__meta-col {
    width: 100%;
    flex: 0 0 auto;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    padding: 0 20px;
  }

  /* Panels container: height driven by EXIF content (in flow).
     Info panel overlays it absolutely so switching tabs never changes height. */
  .lightbox__meta-panels {
    display: block;        /* override desktop flex-direction */
    position: relative;
    flex: 0 0 auto;
  }

  /* Info panel — absolutely fills the panels container, scrolls if needed */
  .lightbox__meta-top {
    position: absolute;
    inset: 0;
    overflow-y: auto;
    padding: 12px 0 8px;
    scrollbar-width: thin;
    scrollbar-color: rgba(var(--accent-rgb), 0.15) transparent;
  }

  /* EXIF panel — stays in flow and sizes the container */
  .lightbox__meta-bottom {
    padding: 12px 0 8px;
    margin-top: 0;
    border-top: none;
  }

  /* Tab switching — visibility:hidden keeps layout height intact */
  .lightbox__meta-top.is-hidden,
  .lightbox__meta-bottom.is-hidden {
    visibility: hidden;
    pointer-events: none;
  }

  /* ── Nav: always pinned at bottom ── */
  .lightbox__nav {
    flex: 0 0 auto;
    margin-top: 0;
    padding: 10px 0 14px;
    border-top: 1px solid var(--accent-faint);
  }
}