/* G 29 — gallery shell
   FvW §00.12: units relative only (no px), rem-based typography, WCAG AA
   contrast, prefers-reduced-motion respected, keyboard + ARIA wired. */

:root {
  --bg: #fbfbfd;
  --surface: #ffffff;
  --border: #e2e2e8;
  --fg: #16161d;
  --fg-dim: #5c5c6b;
  --fg-mute: #8b8b9a;
  --accent: #6d28d9;
  --accent-fg: #ffffff;
  --shadow: 0 0.125rem 0.5rem rgba(20, 20, 40, 0.08);
  --radius: 0.625rem;
  --gap: 1.25rem;
  --pad: 1.25rem;
  --maxw: 75rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101015;
    --surface: #191922;
    --border: #2c2c38;
    --fg: #ececf2;
    --fg-dim: #a8a8b8;
    --fg-mute: #74748a;
    --accent: #a78bfa;
    --accent-fg: #16161d;
    --shadow: 0 0.125rem 0.5rem rgba(0, 0, 0, 0.4);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 1rem;
  line-height: 1.5;
}

main { max-width: var(--maxw); margin: 0 auto; padding: var(--pad); }

/* ── header ─────────────────────────────────────────────── */
.site-header {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2rem var(--pad) 0.5rem;
}
.site-header h1 { margin: 0; font-size: 1.5rem; letter-spacing: -0.01em; }
.subtitle { margin: 0.25rem 0 0; color: var(--fg-dim); font-size: 0.875rem; }
.error { color: #b91c1c; font-weight: 600; }
@media (prefers-color-scheme: dark) { .error { color: #fca5a5; } }

/* ── card grid ──────────────────────────────────────────── */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr));
  gap: var(--gap);
  margin-top: 1.5rem;
}

.card {
  background: var(--surface);
  border: 0.0625rem solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: var(--pad);
  cursor: pointer;
  text-align: left;
  font: inherit;
  color: inherit;
  transition: transform 0.12s ease, border-color 0.12s ease;
}
.card:hover, .card:focus-visible { transform: translateY(-0.125rem); border-color: var(--accent); outline: none; }
.card h3 { margin: 0 0 0.25rem; font-size: 1.0625rem; }
.card .meta { color: var(--fg-mute); font-size: 0.8125rem; font-variant-numeric: tabular-nums; }

@media (prefers-reduced-motion: reduce) {
  .card, .card:hover { transition: none; transform: none; }
}

/* ── overlay ────────────────────────────────────────────── */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(10, 10, 18, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--pad);
  z-index: 50;
}
.overlay[hidden] { display: none; }

.panel {
  background: var(--surface);
  border: 0.0625rem solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 0.5rem 2rem rgba(0, 0, 0, 0.25);
  width: min(60rem, 100%);
  max-height: 88vh;
  display: flex;
  flex-direction: column;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap);
  padding: var(--pad);
  border-bottom: 0.0625rem solid var(--border);
}
.panel-head h2 { margin: 0; font-size: 1.125rem; }
.close {
  background: none;
  border: 0.0625rem solid var(--border);
  border-radius: 0.375rem;
  color: var(--fg-dim);
  cursor: pointer;
  font-size: 1.25rem;
  line-height: 1;
  min-width: 2.25rem;
  min-height: 2.25rem;
}
.close:hover { border-color: var(--accent); color: var(--accent); }

/* ── tabs ───────────────────────────────────────────────── */
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  padding: 0.75rem var(--pad) 0;
  border-bottom: 0.0625rem solid var(--border);
}
.tab {
  background: none;
  border: 0.0625rem solid transparent;
  border-bottom: none;
  border-radius: 0.375rem 0.375rem 0 0;
  color: var(--fg-dim);
  cursor: pointer;
  font: inherit;
  font-size: 0.875rem;
  padding: 0.5rem 0.75rem;
  min-height: 2.25rem;
}
.tab[aria-selected="true"] {
  background: var(--surface);
  border-color: var(--border);
  color: var(--fg);
  font-weight: 600;
  margin-bottom: -0.0625rem;
}
.tab:focus-visible { outline: 0.125rem solid var(--accent); outline-offset: -0.125rem; }

.tab-body { padding: var(--pad); overflow-y: auto; }

/* ── empty state — visible, greyed, never hidden ────────── */
.empty {
  color: var(--fg-mute);
  font-style: italic;
  padding: 1.5rem 0;
}
.tab-summary { color: var(--fg-dim); font-size: 0.875rem; margin: 0 0 1rem; }
.tab.is-empty { color: var(--fg-mute); }

/* ── rendered content ───────────────────────────────────── */
.prose h1, .prose h2, .prose h3, .prose h4 { margin: 1.25rem 0 0.5rem; line-height: 1.25; }
.prose h1 { font-size: 1.375rem; } .prose h2 { font-size: 1.1875rem; }
.prose h3 { font-size: 1.0625rem; } .prose h4 { font-size: 0.9375rem; color: var(--fg-dim); }
.prose p { margin: 0.75rem 0; }
.prose ul, .prose ol { margin: 0.75rem 0; padding-left: 1.5rem; }
.prose li { margin: 0.25rem 0; }
.prose li > ul, .prose li > ol { margin: 0.25rem 0; }
.prose blockquote {
  margin: 0.75rem 0; padding: 0.5rem 1rem;
  border-left: 0.1875rem solid var(--border); color: var(--fg-dim);
}
.prose hr { border: 0; border-top: 0.0625rem solid var(--border); margin: 1.5rem 0; }
.prose code {
  background: var(--bg); border: 0.0625rem solid var(--border);
  border-radius: 0.25rem; padding: 0.0625rem 0.3125rem;
  font-size: 0.875em; overflow-wrap: anywhere;
}
.prose pre {
  background: var(--bg); border: 0.0625rem solid var(--border);
  border-radius: 0.375rem; padding: 0.75rem; overflow-x: auto;
}
.prose pre code { background: none; border: 0; padding: 0; }
.prose a { color: var(--accent); overflow-wrap: anywhere; }

/* ── JSON rendering — never a raw dump ──────────────────── */
.kv { width: 100%; border-collapse: collapse; margin: 0.5rem 0; font-size: 0.875rem; }
.kv th, .kv td {
  text-align: left; vertical-align: top; padding: 0.375rem 0.5rem;
  border-bottom: 0.0625rem solid var(--border); overflow-wrap: anywhere;
}
.kv th { width: 30%; color: var(--fg-dim); font-weight: 600; }
.kv td .muted { color: var(--fg-mute); font-style: italic; }
.json-block { margin: 0.5rem 0 0.5rem 1rem; }
.fallback {
  background: var(--bg); border: 0.0625rem solid var(--border);
  border-radius: 0.375rem; padding: 0.75rem; overflow-x: auto;
  font-size: 0.8125rem; white-space: pre-wrap; overflow-wrap: anywhere;
}

@media (max-width: 40rem) {
  .panel { max-height: 94vh; }
  .kv th { width: 40%; }
}

/* ── preview artefacts (G 30) ──────────────────────────── */
.meta-line { color: var(--fg-mute); font-size: 0.8125rem; margin: 0.25rem 0 0.75rem; }
.shots {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(11rem, 1fr));
  gap: 0.75rem;
  margin: 0.5rem 0 1rem;
}
.shots figure { margin: 0; }
.shots img {
  display: block;
  width: 100%;
  height: auto;
  background: var(--bg);
  border: 0.0625rem solid var(--border);
  border-radius: 0.375rem;
  overflow-wrap: anywhere;
}
.shots figcaption {
  color: var(--fg-dim);
  font-size: 0.75rem;
  margin-top: 0.25rem;
  text-align: center;
  overflow-wrap: anywhere;
}