/*
 * gallery.css — Boston 2026 Philatelic Archive
 * Two-column layout (filters + results), filter controls, active-filter chips,
 * responsive card grid, list view, and the stamp placeholder.
 * Depends on theme.css tokens and main.css base.
 */

/* ── Layout ──────────────────────────────────────────────────────────────── */
.layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--space-8);
  padding-block: var(--space-8);
  align-items: start;
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
    gap: var(--space-5);
  }
}

/* ── Filter panel ────────────────────────────────────────────────────────── */
.filter-panel {
  position: sticky;
  top: calc(64px + var(--space-4));
  /* The panel can be taller than the viewport (many sections); give it its own
     scroll so its bottom controls stay reachable independent of page scroll. */
  max-height: calc(100vh - 64px - var(--space-8));
  overflow-y: auto;
  overscroll-behavior: contain;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
}

@media (max-width: 900px) {
  .filter-panel {
    position: static;
    max-height: none;
    overflow: visible;
  }
}

.filter-home-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  width: 100%;
  margin-bottom: var(--space-4);
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-accent-gold);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color 0.15s, border-color 0.15s;
}
.filter-home-link:hover {
  background: var(--color-hover-overlay);
  border-color: var(--color-accent-gold);
}

.filter-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
}

/* ── Home intro (landing view in the content column) ─────────────────────── */
.home-intro {
  text-align: center;
  padding: var(--space-12) var(--space-6) var(--space-16);
  max-width: 720px;
  margin-inline: auto;
}
.home-intro__stamp {
  display: inline-flex;
  width: 96px;
  height: 96px;
  color: var(--color-accent-gold);
  margin-bottom: var(--space-5);
}
.home-intro__title {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-2);
}
.home-intro__subtitle {
  font-family: var(--font-body);
  font-size: var(--text-xl);
  font-weight: 300;
  color: var(--color-accent-gold);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: var(--space-4);
}
.home-intro__unofficial {
  display: inline-block;
  margin-bottom: var(--space-5);
  padding: 0.15em 0.7em;
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
}
.home-intro__stats {
  font-family: var(--font-mono);
  font-size: var(--text-base);
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
  margin-bottom: var(--space-6);
}
.home-intro__hint {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: var(--leading-relaxed);
  max-width: 48ch;
  margin-inline: auto;
}

@media (max-width: 768px) {
  .home-intro { padding: var(--space-8) var(--space-4); }
  .home-intro__title { font-size: var(--text-3xl); }
}

.filter-panel__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  margin: 0;
}

.filter-panel__toggle { display: none; }

@media (max-width: 900px) {
  .filter-panel__toggle { display: inline-flex; }
  .filter-panel.collapsed .filter-panel__body { display: none; }
}

.filter-panel__body {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.filter-group--row {
  flex-direction: row;
  align-items: center;
}

.filter-group__label {
  display: inline-flex;
  align-items: center;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.radio-list,
.checkbox-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

/* Sub-heading inside the section radio list (Main / Open Area / Special). */
.radio-group-label {
  margin: var(--space-2) 0 2px;
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-accent-gold);
}
.radio-group-label:first-child { margin-top: 0; }

.checkbox-list .medal-swatch {
  font-size: var(--text-xs);
}

.country-select {
  max-height: 160px;
}

.frame-range {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.frame-input { width: 100%; }

.filter-panel__clear { margin-top: var(--space-2); }

/* ── Chips (special prizes) ──────────────────────────────────────────────── */
.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.chip {
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, background-color 0.15s;
}

.chip:hover { border-color: var(--color-accent-gold); color: var(--color-accent-gold); }

.chip.active {
  background-color: var(--color-active-chip);
  color: var(--color-chip-text);
  border-color: var(--color-active-chip);
}

/* ── Results bar ─────────────────────────────────────────────────────────── */
.results__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.results__count {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.results__controls {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.results__sort-label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.results__sort { width: auto; min-width: 160px; }

.view-toggle { display: flex; gap: var(--space-1); }

.view-toggle .btn[aria-pressed="true"] {
  background-color: var(--color-hover-overlay);
  color: var(--color-accent-gold);
}

/* ── Active filter chips ─────────────────────────────────────────────────── */
.active-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.active-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  color: var(--color-chip-text);
  background-color: var(--color-active-chip);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
}

.active-chip span { opacity: 0.8; }
.active-chip:hover { filter: brightness(1.1); }

/* ── Card grid ───────────────────────────────────────────────────────────── */
.gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}

@media (max-width: 1100px) { .gallery { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px)  { .gallery { grid-template-columns: 1fr; } }

.gallery[data-view="list"] { grid-template-columns: 1fr; }

.card {
  display: flex;
  flex-direction: column;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s;
}

.card:hover,
.card:focus-visible {
  border-color: var(--color-accent-gold);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
  outline: none;
}

.card-media {
  position: relative;
  aspect-ratio: 3 / 2;
  background-color: var(--color-bg);
}

.card-thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.card-thumb.img-fallback,
.img-fallback {
  background:
    repeating-linear-gradient(45deg, var(--color-surface-raised) 0 8px, var(--color-surface) 8px 16px);
  position: relative;
}

.card-media .medal-pill {
  position: absolute;
  top: var(--space-2);
  left: var(--space-2);
}

.photo-count {
  position: absolute;
  bottom: var(--space-2);
  right: var(--space-2);
  padding: 0.1em 0.5em;
  font-size: var(--text-xs);
  color: #fff;
  background: rgba(0, 0, 0, 0.6);
  border-radius: var(--radius-full);
}

.card-body {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-4);
}

.card-frame {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-accent-gold);
  letter-spacing: 0.04em;
}

.card-exhibitor {
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--color-text);
}

.card-country {
  display: flex;
  align-items: center;
  gap: 0.35em;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}
.card-country .flag {
  font-size: 1.3rem;        /* fixed, independent of the small country text */
  line-height: 1;
  vertical-align: 0;
}

.card-title {
  font-family: var(--font-display);
  font-size: var(--text-base);
  color: var(--color-text);
  line-height: var(--leading-snug);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin-top: var(--space-1);
}

.card-score {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--text-sm);
  color: var(--color-accent-gold);
}
.card-score-max {
  font-size: 0.78em;
  font-weight: 400;
  color: var(--color-text-muted);
}

.flag { font-size: 1.4em; vertical-align: -0.12em; }

/* List view: horizontal cards */
.gallery[data-view="list"] .card {
  flex-direction: row;
}
.gallery[data-view="list"] .card-media {
  width: 200px;
  flex-shrink: 0;
  aspect-ratio: auto;
}
.gallery[data-view="list"] .card-body { flex: 1; }

@media (max-width: 560px) {
  .gallery[data-view="list"] .card { flex-direction: column; }
  .gallery[data-view="list"] .card-media { width: 100%; aspect-ratio: 3 / 2; }
}

/* ── Empty state + sentinel ──────────────────────────────────────────────── */
.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: var(--space-16) var(--space-4);
  color: var(--color-text-muted);
}

.empty-state .muted { font-size: var(--text-sm); }
.muted { color: var(--color-text-muted); }

.scroll-sentinel { grid-column: 1 / -1; height: 1px; }

/* ── Extra medal / prize colors not in theme tokens ──────────────────────── */
.medal-pill--sb { background: #9a8478; color: #fff; }
.prize-badge--gp,
.prize-badge--gpic,
.prize-badge--gpnc,
.prize-badge--gphc { background: var(--color-badge-gp); }
.prize-badge--fel  { background: var(--color-badge-fel); }