/* Preview pane: header, tabs, body (diff, code, media, 3D), metadata. */
.pv-empty { flex: 1; min-height: 0; overflow: auto; display: flex; }
.pv { flex: 1; min-height: 0; display: flex; flex-direction: column; }
.pv-grabber { display: none; }

.pv-head { display: flex; align-items: flex-start; gap: .75rem; padding: .875rem .625rem .75rem 1rem; flex: none; }
.pv-icon {
  display: grid; place-items: center; width: 2.5rem; height: 2.5rem; border-radius: .625rem; flex: none;
  background: var(--surface-2); border: 1px solid var(--line);
}
.pv-icon .file-icon { width: 1.375rem; height: 1.375rem; }
.pv-icon .file-icon svg { width: 1.375rem; height: 1.375rem; }
.pv-titles { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: .1875rem; }
.pv-name-row { display: flex; align-items: center; gap: .625rem; min-width: 0; }
.pv-name { font: 600 1rem/1.3 var(--font-ui); letter-spacing: -.005em; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; }
.pv-badge { flex: none; display: flex; }
.pv-path {
  display: inline-flex; align-items: center; gap: .375rem; max-width: 100%; padding: 2px .25rem; margin-left: -.25rem; border-radius: .3125rem;
  color: var(--text-3); font: .75rem/1.4 var(--font-mono); text-align: left;
}
.pv-path:hover { color: var(--text); background: var(--surface-2); }
.pv-path b { font-weight: 500; color: var(--text-2); }
.pv-path-text { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; direction: ltr; }
.pv-path .icon { opacity: 0; transition: opacity var(--t-fast) var(--ease); }
.pv-path:hover .icon, .pv-path:focus-visible .icon { opacity: 1; }
.pv-actions { display: flex; align-items: center; gap: 0; flex: none; }

.pv-bar { display: flex; align-items: flex-end; gap: .625rem; padding: 0 .75rem 0 .625rem; border-bottom: 1px solid var(--line); flex: none; min-height: 2.75rem; }
.tabs { display: flex; gap: 2px; align-self: stretch; align-items: stretch; }
.tab {
  position: relative; display: inline-flex; align-items: center; padding: 0 .75rem; color: var(--text-2); font-weight: 550; font-size: .8438rem;
  transition: color var(--t-fast) var(--ease);
}
.tab:hover { color: var(--text); }
.tab[aria-selected="true"] { color: var(--text); }
.tab[aria-selected="true"]::after { content: ""; position: absolute; left: .625rem; right: .625rem; bottom: -1px; height: 2px; border-radius: 2px 2px 0 0; background: var(--accent); }
.tab:focus-visible { outline-offset: -4px; }
.pv-version { display: flex; align-items: center; align-self: center; padding: .375rem 0; }
.pv-only { display: inline-flex; align-items: center; gap: .5rem; color: var(--text-2); font-size: .7812rem; }
.versions .seg .icon { color: var(--text-3); }

.pv-body { position: relative; flex: 1; min-height: 0; display: flex; flex-direction: column; overflow: hidden; outline: none; }
.pv-loading { flex: 1; overflow: hidden; padding-top: .5rem; }
.pv-body > .state { flex: 1; }
.stack { flex: 1; min-height: 0; display: flex; flex-direction: column; }

.pv-meta {
  display: flex; flex-wrap: wrap; gap: .375rem; padding: .625rem .75rem; border-top: 1px solid var(--line); flex: none;
  max-height: 6rem; overflow: auto;
}
.pv-meta:empty { display: none; }
.meta-chip {
  display: inline-flex; align-items: baseline; gap: .375rem; height: 1.625rem; padding: 0 .5625rem; border-radius: .375rem;
  background: var(--surface-2); border: 1px solid var(--line); font-size: .75rem; white-space: nowrap; line-height: 1.5rem;
}
.meta-label { color: var(--text-3); }
.meta-value { color: var(--text); font-variant-numeric: tabular-nums; }
.meta-chip .mono { font-size: .7188rem; }

/* Shared pane toolbar (diff, code, media) */
.pane-toolbar { display: flex; align-items: center; gap: .5rem; min-height: 2.625rem; padding: .375rem .625rem .375rem .875rem; border-bottom: 1px solid var(--line); flex: none; font-size: .7812rem; background: var(--surface-1); overflow-x: auto; scrollbar-width: none; }
.pane-toolbar::-webkit-scrollbar { display: none; }

/* ------------------------------------------------------------ empty preview */
.empty-inner { margin: auto; max-width: 25rem; padding: 2.5rem 1.75rem; display: flex; flex-direction: column; align-items: center; text-align: center; gap: .625rem; }
.empty-art { position: relative; width: 8.25rem; height: 5.25rem; margin-bottom: .625rem; }
.ea {
  position: absolute; display: grid; place-items: center; width: 3.75rem; height: 3.75rem; border-radius: 1rem;
  background: var(--surface-2); border: 1px solid var(--line-2); box-shadow: var(--shadow-pop);
}
.ea .file-icon, .ea .file-icon svg { width: 1.75rem; height: 1.75rem; }
.ea-1 { left: 0; top: .875rem; transform: rotate(-9deg); }
.ea-2 { left: 2.25rem; top: 0; z-index: 1; background: var(--surface-3); }
.ea-3 { right: 0; top: 1rem; transform: rotate(8deg); }
.empty-title { font: 600 1rem/1.35 var(--font-display); letter-spacing: -.01em; }
.empty-body { color: var(--text-2); font-size: .8438rem; }
.empty-summary {
  display: flex; flex-direction: column; gap: .5rem; width: 100%; margin-top: .75rem; padding: .875rem; border-radius: var(--r-md);
  border: 1px solid var(--line); background: var(--surface-2); text-align: left; transition: border-color var(--t-fast) var(--ease);
}
a.empty-summary:hover { border-color: var(--text-3); }
.empty-summary-head { display: flex; justify-content: space-between; align-items: center; gap: .5rem; font: 600 .7812rem var(--font-mono); }
.empty-summary-head .summary-link { font: 550 .7812rem var(--font-ui); }
.empty-summary .change-bar { height: .375rem; }
.kbd-hints { display: flex; flex-wrap: wrap; justify-content: center; gap: .5rem .875rem; margin-top: 1.125rem; color: var(--text-3); font-size: .75rem; }
.kbd-hints span { display: inline-flex; align-items: center; gap: .375rem; }

/* ------------------------------------------------------------ diff */
.diff-view, .code-view { flex: 1; min-height: 0; display: flex; flex-direction: column; }
.diff-stat { display: flex; align-items: center; gap: .625rem; font: .75rem var(--font-mono); font-variant-numeric: tabular-nums; white-space: nowrap; }
.diff-stat .muted { font-family: var(--font-ui); }
.hunk-nav { display: flex; align-items: center; gap: 0; }
.hunk-counter { min-width: 3.5rem; text-align: center; color: var(--text-2); font: .75rem var(--font-mono); font-variant-numeric: tabular-nums; }
.diff-scroll, .code-scroll { position: relative; flex: 1; min-height: 0; overflow: auto; outline: none; font: .7812rem/1.25rem var(--font-mono); tab-size: 4; background: var(--surface-1); }
.diff-scroll:focus-visible, .code-scroll:focus-visible { box-shadow: inset 0 0 0 2px var(--focus); }
.diff-table, .code-table { min-width: 100%; width: max-content; padding-bottom: 1.5rem; }
.wrap .diff-table, .wrap .code-table, .split .diff-table { width: 100%; }
.dl { display: grid; grid-template-columns: var(--ln-w) var(--ln-w) 1.125rem minmax(0, 1fr); }
.dl2 { display: grid; grid-template-columns: var(--ln-w) minmax(0, 1fr) var(--ln-w) minmax(0, 1fr); }
.ln { padding: 0 .5rem 0 0; color: var(--text-3); text-align: right; user-select: none; font-variant-numeric: tabular-nums; }
.sg { color: var(--text-3); text-align: center; user-select: none; }
.tx { padding: 0 1rem 0 2px; white-space: pre; }
.wrap .tx, .split .tx { white-space: pre-wrap; overflow-wrap: anywhere; }
/* Split columns are half as wide: one-column tabs keep deep KV3 nesting from pushing code below its line number. */
.split .diff-scroll { tab-size: 1; }
.dl.add { background: var(--diff-add-bg); }
.dl.add .sg, .dl.add .ln { color: var(--added-text); }
.dl.del { background: var(--diff-del-bg); }
.dl.del .sg, .dl.del .ln { color: var(--removed-text); }
.dl.add .ln, .dl.del .ln { opacity: .75; }
.dl2 .tx.add, .dl2 .ln.add { background: var(--diff-add-bg); }
.dl2 .tx.del, .dl2 .ln.del { background: var(--diff-del-bg); }
.dl2 .ln.add { color: var(--added-text); }
.dl2 .ln.del { color: var(--removed-text); }
.dl2 .tx.empty, .dl2 .ln.empty { background: repeating-linear-gradient(135deg, transparent 0 .3125rem, var(--surface-2) .3125rem .375rem); }
.dl2 > :nth-child(3) { border-left: 1px solid var(--line); }
.dl mark, .dl2 mark { color: inherit; border-radius: .1875rem; padding: 1px 0; }
.dl.add mark, .dl2 .tx.add mark { background: var(--diff-add-word); }
.dl.del mark, .dl2 .tx.del mark { background: var(--diff-del-word); }
.hunk {
  position: relative; display: flex; align-items: center; gap: .75rem; height: 1.875rem; margin-top: .5rem; padding: 0 .875rem;
  background: var(--diff-hunk-bg); color: var(--accent); font-size: .7188rem; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
}
.hunk:first-child { margin-top: 0; border-top: 0; }
.hunk-gap { color: var(--text-3); font-family: var(--font-ui); }
.hunk.flash { animation: hunkflash 900ms var(--ease); }
@keyframes hunkflash { from { box-shadow: inset 3px 0 0 var(--accent), 0 0 0 9999px transparent; background: var(--accent-soft); } }
.diff-identical { flex: 1; display: flex; }

/* code */
.cl { display: grid; grid-template-columns: var(--ln-w) minmax(0, 1fr); }
.cl:hover { background: var(--surface-2); }
.cl .tx { padding-left: .75rem; }
.c-str { color: var(--code-string); }
.c-num { color: var(--code-number); }
.c-key { color: var(--code-key); }
.c-kw { color: var(--code-number); font-weight: 600; }
.c-com { color: var(--code-comment); font-style: italic; }
.c-p { color: var(--code-punct); }
.code-plain { display: grid; grid-template-columns: auto 1fr; }
.code-plain pre { margin: 0; padding: 0 1rem 1.5rem .75rem; font: inherit; white-space: pre; }
.code-gutter { color: var(--text-3); text-align: right; user-select: none; padding-left: .5rem !important; padding-right: .5rem !important; border-right: 1px solid var(--line); }

/* ------------------------------------------------------------ media */
.media { flex: 1; min-height: 0; display: flex; flex-direction: column; }
.media-toolbar > .muted { white-space: nowrap; font-family: var(--font-mono); font-size: .7188rem; }
.media-toolbar .segmented.channels .seg { min-width: 2.125rem; justify-content: center; font-family: var(--font-mono); font-size: .7188rem; }
.ch-r[aria-pressed="true"] { color: #ff8b80 !important; }
.ch-g[aria-pressed="true"] { color: #6fe0a6 !important; }
.ch-b[aria-pressed="true"] { color: #8eb4ff !important; }
.image-stage { position: relative; flex: 1; min-height: 0; overflow: auto; display: grid; place-items: center; padding: 1rem; }
.image-stage.fit img, .image-stage.fit canvas { width: 100%; height: 100%; max-width: var(--max-w, 100%); max-height: var(--max-h, 100%); object-fit: contain; }
.image-stage.actual { place-items: start; }
.image-stage.actual img, .image-stage.actual canvas { max-width: none; max-height: none; margin: auto; }
.image-stage.pixelated img, .image-stage.pixelated canvas { image-rendering: pixelated; }
.image-stage img { opacity: 0; transition: opacity var(--t-med) var(--ease); }
.image-stage.loaded img, .compare-side img, .swipe-stage img { opacity: 1; }
.compare-grid { flex: 1; min-height: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--line); }
.compare-side { margin: 0; display: flex; flex-direction: column; min-height: 0; background: var(--surface-1); }
.compare-side figcaption { display: flex; align-items: center; gap: .5rem; height: 2.375rem; padding: 0 .875rem; font-size: .7812rem; font-weight: 550; border-bottom: 1px solid var(--line); }
.compare-side figcaption .muted { margin-left: auto; font: .7188rem var(--font-mono); }
.swipe-stage { padding: 0; cursor: ew-resize; touch-action: none; user-select: none; container-type: size; place-items: center; overflow: hidden; }
.swipe-layer { position: relative; width: min(100cqw - 2rem, (100cqh - 2rem) * var(--ratio, 1), var(--max-w, 256rem)); aspect-ratio: var(--ratio, 1); }
.swipe-layer img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: fill; }
.swipe-handle { position: absolute; top: 0; bottom: 0; width: 2px; margin-left: -1px; background: var(--text); box-shadow: 0 0 0 1px rgba(0, 0, 0, .25); }
.swipe-grip {
  position: absolute; top: 50%; left: 50%; display: grid; place-items: center; width: 2rem; height: 2rem; border-radius: 50%;
  transform: translate(-50%, -50%); background: var(--text); color: var(--ink-inverse); box-shadow: var(--shadow-pop);
}
.swipe-handle:focus-visible .swipe-grip { outline: 2px solid var(--focus); outline-offset: 2px; }
.swipe-tag {
  position: absolute; top: .75rem; display: inline-flex; align-items: center; gap: .375rem; padding: .25rem .5625rem; border-radius: 62.4375rem;
  background: var(--glass); backdrop-filter: blur(.5rem); font-size: .75rem; font-weight: 550; pointer-events: none; border: 1px solid var(--line);
}
.swipe-tag.left { left: .75rem; }
.swipe-tag.right { right: .75rem; }

.audio-stage { flex: 1; min-height: 0; overflow: auto; display: flex; flex-direction: column; gap: .875rem; padding: 1.25rem; }
.audio-card {
  --wave: var(--text-3); --wave-played: var(--accent);
  display: flex; flex-direction: column; gap: .75rem; padding: 1rem; border-radius: var(--r-md); border: 1px solid var(--line); background: var(--surface-2);
}
.audio-card.tone-old { --wave-played: var(--removed); }
.audio-card.tone-new { --wave-played: var(--added); }
.audio-head { display: flex; align-items: center; gap: .5rem; font-size: .8125rem; font-weight: 550; min-width: 0; }
.audio-head .icon { color: var(--cat-sound); }
.audio-label { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.audio-head .muted { font: .75rem var(--font-mono); white-space: nowrap; }
.waveform-wrap { position: relative; height: 5.5rem; cursor: pointer; }
.waveform-wrap.no-wave { display: none; }
.waveform { width: 100%; height: 100%; }
.audio-card audio { width: 100%; height: 2.5rem; }
.video-stage { background: #000; display: grid; place-items: center; }
.video-stage video { max-width: 100%; max-height: 100%; width: 100%; height: 100%; object-fit: contain; }

/* ------------------------------------------------------------ 3D viewer */
.viewer { position: relative; flex: 1; min-height: 0; overflow: hidden; background: #161c24; color: #e9ebef; }
.viewer-canvas-host { position: absolute; inset: 0; }
.viewer-canvas-host canvas { display: block; width: 100%; height: 100%; }
.viewer-status {
  position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); display: flex; align-items: center; gap: .625rem;
  padding: .625rem .875rem; border-radius: 62.4375rem; background: rgba(13, 16, 21, .78); border: 1px solid rgba(255, 255, 255, .08);
  font-size: .7812rem; color: #c8ced8; backdrop-filter: blur(.625rem); max-width: calc(100% - 2rem); pointer-events: none;
}
.viewer-status .spinner { border-color: rgba(255, 255, 255, .15); border-top-color: #8da2ff; }
.viewer-toolbar {
  position: absolute; left: 50%; bottom: .875rem; transform: translate(-50%, .5rem); display: flex; align-items: center; gap: 2px;
  padding: .25rem; border-radius: .75rem; background: rgba(13, 16, 21, .8); border: 1px solid rgba(255, 255, 255, .09);
  box-shadow: 0 10px 30px rgba(0, 0, 0, .4); backdrop-filter: blur(.75rem); max-width: calc(100% - 1.5rem); width: max-content;
  flex-wrap: wrap; justify-content: center; row-gap: 2px; /* wraps to a second row in narrow panes instead of hiding tools */
  opacity: 0; pointer-events: none; transition: opacity var(--t-med) var(--ease), transform var(--t-med) var(--ease);
}
.viewer-toolbar::-webkit-scrollbar { display: none; }
.viewer-toolbar.show { opacity: 1; transform: translate(-50%, 0); pointer-events: auto; }
.viewer .tool { display: grid; place-items: center; width: 2.125rem; height: 2.125rem; border-radius: .5rem; color: #c8ced8; flex: none; }
.viewer .tool:hover { background: rgba(255, 255, 255, .08); color: #fff; }
.viewer .tool[aria-pressed="true"] { color: #a9b8ff; background: rgba(141, 162, 255, .16); }
.viewer .tool:focus-visible { outline: 2px solid #8da2ff; outline-offset: -2px; }
.tool-field { position: relative; display: inline-flex; align-items: center; flex: none; border-radius: .5rem; color: #a3aab7; }
.tool-field > .icon { position: absolute; left: .5625rem; pointer-events: none; }
.tool-field:hover { background: rgba(255, 255, 255, .08); color: #e9ebef; }
.tool-select {
  height: 2.125rem; width: auto; max-width: 11rem; padding: 0 1.5rem 0 1.875rem; border-radius: .5rem; border: 0; background: transparent; color: #e9ebef; font-size: .7812rem;
  text-overflow: ellipsis; white-space: nowrap; overflow: hidden;
  appearance: none; cursor: pointer; flex: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23a3aab7' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9.5l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right .4375rem center; background-size: .8125rem;
}
.tool-select option { background: #111318; color: #e9ebef; }
.tool-select:focus-visible { outline: 2px solid #8da2ff; outline-offset: -2px; }
.tool-sep { width: 1px; height: 1.25rem; margin: 0 .25rem; background: rgba(255, 255, 255, .12); flex: none; }
.viewer-hint {
  position: absolute; right: .75rem; top: .75rem; padding: .25rem .5625rem; border-radius: 62.4375rem; font-size: .7188rem; color: rgba(233, 235, 239, .62);
  background: rgba(13, 16, 21, .5); opacity: 0; transition: opacity var(--t-med) var(--ease); pointer-events: none;
}
.viewer.ready .viewer-hint { opacity: 1; }
.viewer.ready:hover .viewer-hint { opacity: .35; }
.viewer-caption {
  position: absolute; left: .75rem; top: .75rem; display: inline-flex; align-items: center; gap: .4375rem; padding: .25rem .625rem; border-radius: 62.4375rem;
  background: rgba(13, 16, 21, .72); border: 1px solid rgba(255, 255, 255, .08); font-size: .75rem; font-weight: 550; backdrop-filter: blur(.5rem);
}
.compare-grid.viewers .viewer-hint { display: none; }
.viewer-error { position: absolute; inset: 0; display: grid; place-items: center; background: rgba(17, 19, 24, .6); }
.viewer-error .state { color: #a3aab7; }
.viewer-error .state-title { color: #e9ebef; }
.viewer-error .state-icon { background: rgba(203, 70, 65, .18); color: #ff7d73; }
.viewer-error .btn { background: rgba(255, 255, 255, .06); border-color: rgba(255, 255, 255, .14); color: #e9ebef; }
.viewer:fullscreen { border-radius: 0; }

/* ------------------------------------------------------------ preview on smaller screens */
@media (max-width: 760px) {
  .pv-grabber { display: block; width: 2.25rem; height: .25rem; border-radius: 2px; background: var(--line-2); margin: .5rem auto 0; flex: none; }
  .pv-head { padding: .625rem .375rem .625rem 1rem; gap: .625rem; }
  .pv-icon { width: 2.25rem; height: 2.25rem; }
  .pv-actions .icon-btn { width: 2.375rem; height: 2.375rem; }
  .hide-mobile { display: none !important; }
  .pv-bar { flex-wrap: wrap; padding: 0 .5rem; }
  .pv-version { width: 100%; order: 2; overflow-x: auto; padding: .375rem .25rem .5rem; }
  .compare-grid { grid-template-columns: 1fr; grid-template-rows: 1fr 1fr; }
  .viewer-hint { display: none; }
  .pv-meta { flex-wrap: nowrap; overflow-x: auto; padding-bottom: calc(.625rem + env(safe-area-inset-bottom)); }
  .diff-toolbar .diff-stat .muted { display: none; }
  .diff-scroll, .code-scroll { tab-size: 2; font-size: .75rem; }
  .pv-icon { display: none; }
  .pv-head { padding-left: 1rem; }
  .pv-name-row { flex-wrap: wrap; row-gap: .25rem; }
  .pv-name { font-size: .9375rem; }
  .audio-stage { padding: 1rem; }
  .media-toolbar > span.muted:not(.tabular) { display: none; }
  .media-toolbar .segmented.channels .seg { min-width: 1.75rem; padding: 0 .375rem; }
}