/*
 * modal.css — Boston 2026 Philatelic Archive
 * Exhibit detail modal: backdrop, dialog, zoom viewer, variant strip, metadata.
 * Depends on theme.css tokens.
 */

.modal {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  display: none;
}

.modal.open { display: block; }

body.modal-open { overflow: hidden; }

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(2px);
}

.modal-dialog {
  position: relative;
  z-index: 1;
  width: min(1100px, 94vw);
  max-height: 92vh;
  margin: 4vh auto;
  display: flex;
  flex-direction: column;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-modal);
  overflow: hidden;
}

.modal-close {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  z-index: 3;
  width: 40px;
  height: 40px;
  font-size: var(--text-lg);
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  cursor: pointer;
}
.modal-close:hover { border-color: var(--color-accent-gold); color: var(--color-accent-gold); }

.modal-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 3;
  width: 44px;
  height: 44px;
  font-size: var(--text-2xl);
  line-height: 1;
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text);
  cursor: pointer;
}
.modal-nav:hover { border-color: var(--color-accent-gold); color: var(--color-accent-gold); }
.modal-nav:disabled { opacity: 0.3; cursor: not-allowed; }
.modal-prev { left: var(--space-3); }
.modal-next { right: var(--space-3); }

.modal-content {
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

/* Viewer stage (viewer + toolbar + image-nav arrows) */
.modal-stage {
  position: relative;
  width: 100%;
  height: min(56vh, 560px);
  background: var(--color-bg);
}
.modal-viewer {
  width: 100%;
  height: 100%;
  position: relative;
  cursor: zoom-in;
}
.viewer-fallback {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  cursor: zoom-in;
}

/* Custom viewer toolbar — top-right, always visible, labeled on hover */
.viewer-toolbar {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  z-index: 4;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  align-items: flex-end;
}
.vbtn {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  font-size: var(--text-xl);
  line-height: 1;
  background: rgba(20, 22, 30, 0.82);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: var(--radius-md);
  cursor: pointer;
  backdrop-filter: blur(2px);
  transition: background-color 0.15s, border-color 0.15s, transform 0.1s;
}
.vbtn:hover { background: var(--color-accent-gold); color: var(--color-text-inverse); border-color: var(--color-accent-gold); }
.vbtn:active { transform: scale(0.94); }
.vbtn-icon { pointer-events: none; }
.vbtn-tip {
  position: absolute;
  right: calc(100% + 8px);
  top: 50%;
  transform: translateY(-50%);
  white-space: nowrap;
  padding: 0.25em 0.6em;
  font-size: var(--text-sm);
  background: rgba(20, 22, 30, 0.95);
  color: #fff;
  border-radius: var(--radius-sm);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.08s ease;
}
.vbtn:hover .vbtn-tip { opacity: 1; }

/* Per-image navigation arrows (this exhibit's images) — shown when enlarged */
.img-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 4;
  width: 54px;
  height: 54px;
  display: none;                /* shown (flex) in fullscreen */
  align-items: center;
  justify-content: center;
  background: rgba(20, 22, 30, 0.72);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-full);
  cursor: pointer;
}
.img-prev { left: var(--space-5); }
.img-next { right: var(--space-5); }
.img-nav:hover { background: var(--color-accent-gold); color: var(--color-text-inverse); }
.img-nav:disabled { opacity: 0.25; cursor: not-allowed; }
.img-nav-arrow {
  font-size: var(--text-4xl);
  line-height: 0;            /* center the chevron glyph in the circle */
}
.img-nav-tip {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  white-space: nowrap;
  padding: 0.25em 0.7em;
  font-size: var(--text-sm);
  color: #fff;
  background: rgba(20, 22, 30, 0.95);
  border-radius: var(--radius-sm);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.08s ease;
}
.img-nav:hover .img-nav-tip { opacity: 1; }

/* Compact metadata beside the image — only visible when enlarged */
.viewer-meta { display: none; }

/* Image counter (e.g. "3 / 8 · Top") — only visible when enlarged */
.img-counter { display: none; }

/* "Press ESC to exit" hint — only visible when enlarged */
.viewer-exit-hint { display: none; }

/* ── Fullscreen (enlarged) mode ──────────────────────────────────────────── */
.modal-dialog.is-fullscreen .modal-stage {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  height: 100vh;
  /* Follow the active theme (light stays light). */
  background: var(--color-bg);
}
.modal-dialog.is-fullscreen .img-nav { display: flex; }
.modal-dialog.is-fullscreen .modal-viewer { cursor: default; }
.modal-dialog.is-fullscreen .viewer-meta {
  display: block;
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  z-index: 4;
  width: 260px;
  max-width: 40vw;
  padding: var(--space-3) var(--space-4);
  background: rgba(20, 22, 30, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius-md);
  color: #fff;
  backdrop-filter: blur(3px);
}
.modal-dialog.is-fullscreen .img-counter {
  display: block;
  position: absolute;
  bottom: var(--space-4);
  left: 50%;
  transform: translateX(-50%);
  z-index: 4;
  padding: 0.3em 1em;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: #fff;
  background: rgba(20, 22, 30, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
  backdrop-filter: blur(2px);
}
.modal-dialog.is-fullscreen .viewer-exit-hint {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1px;
  position: absolute;
  bottom: var(--space-4);
  right: var(--space-4);
  z-index: 4;
  padding: 0.45em 1.1em;
  color: var(--color-text-inverse);
  background: var(--color-accent-gold);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.45);
  transition: background-color 0.15s, transform 0.1s;
}
.viewer-exit-hint:hover,
.modal-exit-btn:hover { background: var(--color-accent-gold-light); }
.viewer-exit-hint:active,
.modal-exit-btn:active { transform: scale(0.96); }
.exit-hint-main { font-weight: 700; font-size: var(--text-sm); }
.exit-hint-sub { font-size: var(--text-xs); opacity: 0.9; }

/* Gold exit button on the normal (description) modal, bottom-right of dialog */
.modal-exit-btn {
  position: absolute;
  bottom: var(--space-3);
  right: var(--space-3);
  z-index: 5;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1px;
  padding: 0.45em 1.1em;
  color: var(--color-text-inverse);
  background: var(--color-accent-gold);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
  transition: background-color 0.15s, transform 0.1s;
}
.modal-dialog.is-fullscreen .modal-exit-btn { display: none; }

@media (max-width: 560px) {
  .exit-hint-main { font-size: var(--text-xs); }
  .exit-hint-sub { font-size: 0.7rem; }
}
.viewer-meta .vm-title {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--space-2);
  line-height: var(--leading-snug);
}
.viewer-meta .vm-row {
  font-size: var(--text-sm);
  color: #d7d4cb;
  margin-bottom: var(--space-1);
  line-height: var(--leading-snug);
}
.viewer-meta .vm-row b { color: #fff; }

@media (max-width: 560px) {
  .modal-dialog.is-fullscreen .viewer-meta { width: 180px; max-width: 55vw; }
}

/* Variant strip */
.modal-variants {
  display: flex;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  overflow-x: auto;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.no-photos-note { padding: var(--space-3) var(--space-4); }

.variant-tile {
  flex-shrink: 0;
  width: 88px;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: 0;
  background: transparent;
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  overflow: hidden;
}
.variant-tile img {
  width: 84px;
  height: 60px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  background: var(--color-surface-raised);
}
.variant-tile.active { border-color: var(--color-accent-gold); }
.variant-caption {
  font-size: 0.65rem;
  color: var(--color-text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Info */
.modal-info { padding: var(--space-5) var(--space-6); }

.modal-title-row {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.modal-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  margin: 0;
  color: var(--color-text);
}

.modal-exhibitor {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  margin: var(--space-2) 0 var(--space-4);
}

.meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-3);
  margin: 0 0 var(--space-4);
}
.meta-row { display: flex; flex-direction: column; gap: 2px; }
.meta-row dt {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}
.meta-row dd {
  margin: 0;
  font-size: var(--text-base);
  color: var(--color-text);
}

.modal-prizes {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin-bottom: var(--space-4);
}

.modal-actions {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

@media (max-width: 560px) {
  .modal-dialog { width: 100vw; max-height: 100vh; margin: 0; border-radius: 0; }
  .modal-viewer { height: 44vh; }
  .modal-nav { width: 38px; height: 38px; }
}