/* Artwork comparison surfaces; palettes and base controls are shared. */
.comparison-pair { min-width: 0; scroll-margin-top: 24px; }
.curtain-figure { position: relative; width: 100%; margin: 0; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); }
.curtain-stage { position: relative; aspect-ratio: var(--pair-ratio, 1); overflow: hidden; border-radius: 7px 7px 0 0; background: var(--paper-deep); cursor: ew-resize; touch-action: pan-y; user-select: none; }
.curtain-stage:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; }
.curtain-base, .curtain-overlay img { display: block; position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; pointer-events: none; }
.curtain-overlay { position: absolute; inset: 0; clip-path: inset(0 calc(100% - var(--reveal)) 0 0); background: var(--paper-deep); pointer-events: none; }
.curtain-stage.reveal-from-right .curtain-overlay { clip-path: inset(0 0 0 calc(100% - var(--reveal))); }
.curtain-stage.is-settling .curtain-overlay { transition: clip-path .2s ease-out; }
.curtain-divider { position: absolute; left: var(--reveal); top: 0; bottom: 0; width: 2px; background: #fff; transform: translateX(-50%); box-shadow: 0 0 4px #0008; pointer-events: none; opacity: 0; }
.curtain-divider > span { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); width: 40px; height: 40px; border: 2px solid #fff; border-radius: 50%; background: #161b22db; color: #fff; display: grid; place-items: center; font-size: 20px; letter-spacing: 3px; }
.curtain-stage.reveal-from-right .curtain-divider { left: calc(100% - var(--reveal)); }
.curtain-stage.is-settling .curtain-divider { transition: left .2s ease-out; }
.curtain-stage:is(:hover, :focus-visible, .is-swiping) .curtain-divider { opacity: 1; }
.only-qwen .curtain-divider, .only-gpt .curtain-divider { visibility: hidden; }
.curtain-label { position: absolute; top: 12px; left: 12px; padding: 5px 9px; border: 1px solid #ffffff38; border-radius: 4px; background: #151b22d9; color: #fff; font-size: 12px; font-weight: 550; line-height: 1.5; pointer-events: none; }
.curtain-card-bar { display: flex; align-items: center; gap: 8px; min-height: 68px; padding: 10px 12px; border-top: 1px solid var(--line); }
.curtain-number { margin: 0; color: var(--ink); font-family: var(--sans); font-size: 16px; font-weight: 650; line-height: 1.4; font-variant-numeric: tabular-nums; }
.curtain-favorite { display: flex; align-items: center; }
.curtain-prompt { margin-left: auto; }
.favorite-button { display: grid; place-items: center; flex: 0 0 auto; width: 44px; height: 44px; padding: 0; border: 1px solid transparent; border-radius: 6px; background: transparent; color: var(--muted); font-size: 29px; line-height: 1; transition: background .15s; }
.favorite-button:hover { color: var(--accent); background: var(--hover); }
.favorite-button[aria-pressed="true"] { color: var(--accent); }
.row-prompt-action { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 6px; background: var(--surface); color: var(--ink); font-size: 15px; font-weight: 600; line-height: 1.5; white-space: nowrap; }
.row-prompt-action:hover { border-color: var(--muted); background: var(--hover); }
.pair-heading { padding: 10px 12px; border: 1px solid var(--line); border-bottom: 0; border-radius: 8px 8px 0 0; background: var(--surface); }
.pair-heading-main { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.pair-name-row { display: flex; align-items: center; gap: 8px; }
.pair-name-row h2 { color: var(--ink); font-size: 16px; font-weight: 650; font-variant-numeric: tabular-nums; }
.pair-theme-row { margin-left: auto; }
.variant-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 12px; }
.variant { position: relative; min-width: 0; margin: 0; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; background: var(--surface); }
.pair-heading + .variant-grid .variant:first-child { border-top-left-radius: 0; border-top-right-radius: 0; }
.variant-header { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 44px; padding: 10px 12px; border-bottom: 1px solid var(--line); color: var(--ink); background: var(--surface-soft); font-size: 14px; }
.variant-header strong { font-weight: 600; }
.variant-header span { font-size: 12px; color: var(--muted); white-space: nowrap; }
.variant-image-button { display: block; position: relative; width: 100%; padding: 0; background: var(--paper-deep); cursor: zoom-in; }
.variant-image-button[aria-disabled="true"] { opacity: 1; cursor: default; }
.variant-frame { display: flex; align-items: center; justify-content: center; position: relative; aspect-ratio: var(--pair-ratio, 1); background: var(--paper-deep); }
.variant-frame img { display: block; position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; }
.variant-pending { display: flex; flex-direction: column; align-items: center; justify-content: center; position: absolute; inset: 0; gap: 12px; padding: 24px; color: var(--muted); text-align: center; }
.variant-pending > span { font-size: 20px; font-weight: 600; }
.variant-pending > small { font-size: 14px; line-height: 1.6; }
.reference-export { position: absolute; right: 12px; bottom: 12px; z-index: 3; display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 10px 14px; border: 1px solid var(--action-bg); border-radius: 6px; background: var(--action-bg); color: var(--action-ink); font-size: 15px; font-weight: 600; line-height: 1.5; box-shadow: 0 2px 8px #0003; }
.reference-export:hover { filter: brightness(1.08); }

/* Image inspection keeps the artwork on a neutral, pannable stage. */
#pair-dialog { width: min(1600px, calc(100vw - 48px)); padding: 24px; }
.pair-dialog-head { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding-bottom: 20px; border-bottom: 1px solid var(--line); }
.pair-dialog-head h2 { font-family: var(--display, var(--sans)); margin-top: 4px; font-size: 28px; font-weight: 700; line-height: 1.35; letter-spacing: -.025em; }
.zoom-toolbar { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px; padding-block: 16px; }
.zoom-help { color: var(--muted); font-size: 14px; }
.zoom-controls { display: flex; align-items: center; gap: 8px; }
.zoom-controls button { min-width: 44px; min-height: 44px; padding: 8px; border: 1px solid var(--line); border-radius: 6px; background: var(--surface); color: var(--ink); font-size: 20px; line-height: 1; }
.zoom-controls button:hover { border-color: var(--muted); background: var(--hover); }
.zoom-controls button:last-child { padding-inline: 14px; font-size: 15px; }
.zoom-controls span { min-width: 90px; font-size: 14px; text-align: center; font-variant-numeric: tabular-nums; }
.paired-zoom { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.paired-zoom.is-single { grid-template-columns: minmax(0, 1fr); max-width: 1200px; margin-inline: auto; }
.zoom-variant { min-width: 0; }
.zoom-variant-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 44px; padding: 10px 14px; border: 1px solid var(--line); border-bottom: 0; border-radius: 8px 8px 0 0; background: var(--surface-soft); font-size: 14px; font-weight: 600; }
.zoom-stage { position: relative; width: 100%; height: min(64vh, 850px); overflow: auto; border: 1px solid var(--line); border-radius: 0 0 8px 8px; background: var(--paper-deep); overscroll-behavior: contain; scrollbar-width: thin; touch-action: pan-x pan-y; cursor: default; }
.zoom-stage.can-pan { cursor: grab; touch-action: none; }
.zoom-stage.is-dragging { cursor: grabbing; user-select: none; }
.zoom-canvas { position: relative; display: grid; place-items: center; min-width: 100%; min-height: 100%; }
.zoom-canvas img { display: block; max-width: none; max-height: none; user-select: none; -webkit-user-drag: none; }
.pair-dialog-foot { display: flex; align-items: center; justify-content: flex-end; gap: 16px; padding-top: 20px; margin-top: 20px; border-top: 1px solid var(--line); }

@media (min-width: 1280px) and (max-width: 1399px) { .curtain-card-bar { gap: 4px; padding-inline: 8px; } .row-prompt-action { padding-inline: 8px; } }
@media (max-width: 640px) {
  .curtain-card-bar { padding: 10px 12px; }
  #pair-dialog { width: 100%; padding: 20px; }
  .pair-dialog-head { gap: 16px; }
  .pair-dialog-head h2 { font-size: 24px; }
  .paired-zoom { grid-template-columns: minmax(0, 1fr); }
  .zoom-stage { height: 55vh; min-height: 280px; }
  .zoom-controls { gap: 6px; }
  .zoom-controls span { min-width: 78px; }
}
@media (prefers-reduced-motion: reduce) { .curtain-stage.is-settling .curtain-overlay, .curtain-stage.is-settling .curtain-divider { transition: none; } }