:root {
  color-scheme: light dark;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;

  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #666666;
  --border: rgba(0, 0, 0, 0.18);
  --surface: rgba(0, 0, 0, 0.06);
  --error: #c0392b;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181c;
    --fg: #e8e8e8;
    --muted: #a3a3a3;
    --border: rgba(255, 255, 255, 0.2);
    --surface: rgba(255, 255, 255, 0.08);
    --error: #ff7a68;
  }
}

body {
  max-width: 960px;
  margin: 0 auto;
  padding: 1.5rem;
  line-height: 1.5;
  background: var(--bg);
  color: var(--fg);
}

header p {
  color: var(--muted);
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
}

.header-top h1 {
  margin-bottom: 0;
}

.github-link {
  font-size: 0.9rem;
  white-space: nowrap;
}

.version-line {
  font-size: 0.8rem;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  color: var(--muted);
  margin-top: -0.5rem;
}

#tabs {
  display: flex;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.5rem;
}

.tab-btn {
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 0.5rem 0.25rem;
  font-size: 1rem;
  cursor: pointer;
  color: inherit;
}

.tab-btn.active {
  border-bottom-color: currentColor;
  font-weight: 600;
}

#tab-about p {
  max-width: 680px;
}

code {
  background: var(--surface);
  padding: 0.1rem 0.3rem;
  border-radius: 3px;
}

#upload-form {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  flex-wrap: wrap;
}

button {
  padding: 0.5rem 1rem;
  cursor: pointer;
}

#status {
  min-height: 1.5rem;
  font-weight: 600;
}

#status.error {
  color: var(--error);
}

#samples-section {
  margin-top: 1.5rem;
}

#samples-section p {
  color: var(--muted);
}

#samples-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 0.75rem;
}

.sample-row {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.6rem 0.85rem;
  background: none;
  color: inherit;
  font: inherit;
  text-align: left;
}

.sample-row:hover:not(:disabled) {
  border-color: currentColor;
}

.sample-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
}

.sample-name {
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 0.85rem;
  font-weight: 600;
}

.sample-size {
  font-size: 0.75rem;
  color: var(--muted);
  white-space: nowrap;
}

.sample-description {
  font-size: 0.8rem;
  color: var(--muted);
}

table#timings-table {
  border-collapse: collapse;
  margin-bottom: 1.5rem;
}

table#timings-table td {
  padding: 0.25rem 0.75rem;
  border-bottom: 1px solid var(--border);
}

table#timings-table td:first-child {
  font-weight: 600;
}

.frames-hint {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: -0.5rem;
}

#truncated-note {
  color: var(--error);
}

#frames-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 200px));
  justify-content: start;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.frame-card {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.5rem;
  text-align: center;
}

.frame-thumb-btn {
  display: block;
  width: 100%;
  /* aspect-ratio is set inline per-frame (real rendered width/height), so the box is never
     stretched or squashed relative to the image it holds - see app.js. */
  border: none;
  border-radius: 4px;
  padding: 0;
  margin: 0 auto;
  background: #000;
  cursor: zoom-in;
  overflow: hidden;
}

.frame-thumb-btn img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.frame-card .frame-meta {
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 0.35rem;
}

pre#metadata-json {
  background: var(--surface);
  padding: 1rem;
  border-radius: 6px;
  overflow-x: auto;
  max-height: 500px;
  overflow-y: auto;
  font-size: 0.85rem;
}

.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  z-index: 1000;
}

/* Our own `display: flex` above has the same specificity as the UA stylesheet's
   `[hidden] { display: none }` and comes later, so it would otherwise win and force the
   lightbox to render even while the `hidden` attribute is set - this rule's higher
   specificity (an added attribute selector) restores the expected hidden behavior. */
.lightbox[hidden] {
  display: none;
}

.lightbox-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  max-width: 100%;
  max-height: 100%;
}

.lightbox-content img {
  max-width: min(90vw, 1024px);
  max-height: 80vh;
  object-fit: contain;
  background: #000;
  border-radius: 4px;
}

.lightbox-content p {
  color: #ddd;
  font-size: 0.85rem;
  text-align: center;
}

.lightbox-close {
  position: absolute;
  top: 1rem;
  right: 1.5rem;
  background: none;
  border: none;
  color: #fff;
  font-size: 2rem;
  line-height: 1;
  cursor: pointer;
  padding: 0.25rem 0.5rem;
}