.tool-app.gray-main *{box-sizing:border-box}
.tool-app.gray-main{margin:0 auto;padding:4px 4px 2px}
.bw-layout{display:grid;grid-template-columns:minmax(0,1fr) 360px;grid-template-areas:"preview upload" "preview controls";gap:16px;align-items:start}
.bw-upload{grid-area:upload}
.bw-preview{grid-area:preview;position:sticky;top:84px}
.bw-controls{grid-area:controls;display:flex;flex-direction:column;gap:12px}
.panel{background:var(--zl-surface);border:1px solid var(--zl-line);border-radius:18px;padding:14px;display:flex;flex-direction:column;gap:10px}
.panel-head{display:flex;justify-content:space-between;align-items:center;gap:10px}
.tool-app .btn-compare{min-height:40px;padding:0 14px;font-size:14px}
.canvas-wrap{height:min(60vh,540px);min-height:280px;border-radius:14px;display:grid;place-items:center;overflow:hidden;background-color:var(--zl-surface-2);
  background-image:linear-gradient(45deg,var(--zl-tint) 25%,transparent 25%,transparent 75%,var(--zl-tint) 75%),linear-gradient(45deg,var(--zl-tint) 25%,transparent 25%,transparent 75%,var(--zl-tint) 75%);background-size:18px 18px;background-position:0 0,9px 9px}
.canvas-wrap canvas{display:block;max-width:100%;max-height:100%}
.canvas-empty{margin:0;padding:20px;text-align:center;color:var(--zl-muted);font-size:15px}
#fileMeta{margin:0;font-size:14px;color:var(--zl-muted);overflow-wrap:anywhere}
.strip{display:flex;gap:8px;overflow-x:auto;padding:2px 2px 4px}
.strip:empty{display:none}
.strip .thumb{width:60px;height:60px;flex:none;padding:0;border:1.5px solid var(--zl-line);border-radius:12px;overflow:hidden;background:var(--zl-surface-2);cursor:pointer;display:grid;place-items:center;color:var(--zl-danger);font-weight:700}
.strip .thumb.active{border-color:var(--zl-accent);box-shadow:0 0 0 2px var(--zl-accent)}
.strip .thumb img{width:100%;height:100%;object-fit:cover;display:block}
.progress-wrap{display:none;gap:6px;flex-direction:column}
.progress-wrap.show{display:flex}
#progressBar{height:6px;border-radius:999px;background:var(--zl-tint);overflow:hidden}
#progressBar>div{height:100%;width:0;background:var(--zl-accent);transition:width .2s ease}
#progressText{font-size:14px;color:var(--zl-muted)}
.file-drop{padding:20px 16px;text-align:center;display:flex;flex-direction:column;align-items:center;gap:6px}
.file-drop .file-sub{margin:0;color:var(--zl-muted);font-size:14.5px}
.file-drop .file-btn{margin-top:6px}
.grp{background:var(--zl-surface);border:1px solid var(--zl-line);border-radius:16px;padding:14px;display:flex;flex-direction:column;gap:8px}
.grp label{display:flex;justify-content:space-between;gap:8px;font:500 14px var(--zl-font-head);color:var(--zl-ink)}
.grp .value{font-family:var(--zl-font-body);color:var(--zl-muted);font-variant-numeric:tabular-nums}
.tool-app .grp select{width:100%;min-height:44px;padding:0 12px;font-size:15px;border:1.5px solid var(--zl-line-2);border-radius:12px;background:var(--zl-surface);color:var(--zl-ink)}
.sliders{gap:12px}
.sl-row{display:flex;flex-direction:column;gap:4px}
.sl-row input[type=range],.out-row input[type=range]{width:100%;min-height:28px;margin:0}
.tiny{margin:0;font-size:13.5px;color:var(--zl-muted);line-height:1.45}
.out-row{display:grid;grid-template-columns:1fr;gap:12px}
.out-row>div{display:flex;flex-direction:column;gap:6px;min-width:0}
#qualityGroup.is-off{opacity:.55}
.actions-bar{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.actions-bar .btn-primary{grid-column:1/-1}
.actions-bar button{width:100%}
@media (max-width:900px){
.bw-layout{grid-template-columns:1fr;grid-template-areas:"upload" "preview" "controls"}
.bw-preview{position:static}
.canvas-wrap{height:auto;min-height:220px;max-height:60vh;aspect-ratio:4/3}
}

/* page overrides */
/* 320px: grid tracks may shrink below the select's intrinsic width */
.tool-app .bw-layout>*{min-width:0}
.tool-app .bw-layout select{max-width:100%;min-width:0}
@media (max-width:900px){.tool-app .bw-layout{grid-template-columns:minmax(0,1fr)}}