[data-tool-root="chroma-subsampling-test"]{
  --gray-50:#fbfbfb;--gray-100:#f7f7f7;--gray-150:#f2f2f2;--gray-200:#eee;--gray-300:#ddd;--gray-400:#bbb;--gray-500:#999;--gray-600:#666;--gray-700:#444;--gray-800:#222;--gray-900:#111;
  --bg-workspace:#f2f2f2;--bg-result:#fff;--text-primary:#111;--text-secondary:#444;--text-tertiary:#666;--border:#ddd;--danger:#a12424;--success:#276749;--radius:6px;--radius-sm:4px;
  box-sizing:border-box;width:100%;padding:0 360px 40px 30px;color:var(--text-primary);font:15px/1.65 "Noto Sans SC",system-ui,-apple-system,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
}
[data-tool-root="chroma-subsampling-test"] *,[data-tool-root="chroma-subsampling-test"] *::before,[data-tool-root="chroma-subsampling-test"] *::after{box-sizing:border-box}
[data-tool-root="chroma-subsampling-test"] [hidden]{display:none!important}
[data-tool-root="chroma-subsampling-test"] .tool-page-header{padding:28px 0 20px}
[data-tool-root="chroma-subsampling-test"] .tool-page-header h1{margin:0;font-size:30px;line-height:1.2;letter-spacing:-.5px}
[data-tool-root="chroma-subsampling-test"] .page-description{max-width:72ch;margin:10px 0 0;color:var(--text-secondary);font-size:16px}
[data-tool-root="chroma-subsampling-test"] .tool-page-divider{border-top:1px solid var(--border);margin-bottom:24px}
[data-tool-root="chroma-subsampling-test"] .tool-workspace{margin:0;padding:0;background:transparent}
[data-tool-root="chroma-subsampling-test"] .workspace-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.05fr);gap:16px;align-items:stretch}
[data-tool-root="chroma-subsampling-test"] .input-panel,[data-tool-root="chroma-subsampling-test"] .result-panel{display:flex;flex-direction:column;min-width:0;padding:16px 24px;background:var(--bg-workspace);border:1px solid var(--border);border-radius:var(--radius)}
[data-tool-root="chroma-subsampling-test"] h2{margin:36px 0 14px;padding-left:11px;border-left:3px solid var(--gray-900);font-size:24px;line-height:1.3}
[data-tool-root="chroma-subsampling-test"] h3{margin:0 0 16px;font-size:18px;line-height:1.35}
[data-tool-root="chroma-subsampling-test"] .field-group+ .field-group{margin-top:16px}
[data-tool-root="chroma-subsampling-test"] .field-label{display:block;margin-bottom:7px;font-weight:700}
[data-tool-root="chroma-subsampling-test"] .field-label--split{display:flex;justify-content:space-between;gap:8px}
[data-tool-root="chroma-subsampling-test"] .field-label output{font-weight:400;color:var(--text-secondary);font-variant-numeric:tabular-nums}
[data-tool-root="chroma-subsampling-test"] .segmented{display:grid;gap:2px;padding:3px;background:var(--gray-200);border:1px solid var(--border);border-radius:var(--radius)}
[data-tool-root="chroma-subsampling-test"] .segmented--three{grid-template-columns:repeat(3,minmax(0,1fr))}
[data-tool-root="chroma-subsampling-test"] .segmented--observations{grid-template-columns:repeat(2,minmax(0,1fr))}
[data-tool-root="chroma-subsampling-test"] .segmented__item{min-width:0;min-height:40px;padding:7px 10px;border:0;border-radius:4px;background:transparent;color:#111;font:700 14px/1.3 inherit;cursor:pointer;overflow-wrap:anywhere}
[data-tool-root="chroma-subsampling-test"] .segmented__item:hover{background:rgba(255,255,255,.72)}
[data-tool-root="chroma-subsampling-test"] .segmented__item.is-active{background:#111;color:#fff}
[data-tool-root="chroma-subsampling-test"] input[type="range"]{width:100%;accent-color:#111}
[data-tool-root="chroma-subsampling-test"] textarea{width:100%;min-height:96px;border:1px solid var(--border);border-radius:var(--radius-sm);background:#fff;color:var(--text-primary);font:inherit;padding:8px 10px;resize:vertical}
[data-tool-root="chroma-subsampling-test"] textarea:focus-visible,[data-tool-root="chroma-subsampling-test"] button:focus-visible,[data-tool-root="chroma-subsampling-test"] input:focus-visible,[data-tool-root="chroma-subsampling-test"] .chroma-stage:focus-visible,[data-tool-root="chroma-subsampling-test"] a:focus-visible,[data-tool-root="chroma-subsampling-test"] summary:focus-visible{outline:3px solid rgba(17,17,17,.35);outline-offset:2px}
[data-tool-root="chroma-subsampling-test"] .field-help{margin:5px 0 0;color:var(--text-tertiary);font-size:13px}
[data-tool-root="chroma-subsampling-test"] .field-group[data-disabled="true"]{opacity:.58}
[data-tool-root="chroma-subsampling-test"] .setup-checklist{margin:18px 0 0;padding:12px;border:1px solid var(--border);border-radius:var(--radius-sm);background:#fff}
[data-tool-root="chroma-subsampling-test"] .setup-checklist legend{padding:0 6px;font-weight:700}
[data-tool-root="chroma-subsampling-test"] .setup-checklist label{display:flex;gap:8px;align-items:flex-start;padding:5px 0}
[data-tool-root="chroma-subsampling-test"] .setup-checklist input{margin-top:5px;accent-color:#111}
[data-tool-root="chroma-subsampling-test"] .input-panel__footer{margin-top:auto;padding-top:18px}
[data-tool-root="chroma-subsampling-test"] .button-row{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(0,.65fr);gap:8px}
[data-tool-root="chroma-subsampling-test"] .btn{min-height:42px;padding:8px 14px;border:1px solid var(--gray-800);border-radius:var(--radius-sm);background:#fff;color:#111;font:700 14px/1.3 inherit;cursor:pointer}
[data-tool-root="chroma-subsampling-test"] .btn:hover{background:var(--gray-100)}
[data-tool-root="chroma-subsampling-test"] .btn-primary{background:#111;color:#fff}
[data-tool-root="chroma-subsampling-test"] .btn-primary:hover{background:#222}
[data-tool-root="chroma-subsampling-test"] .status-line{min-height:25px;margin:11px 0 0;color:var(--text-secondary)}
[data-tool-root="chroma-subsampling-test"] .status-line[data-tone="success"]{color:var(--success)}
[data-tool-root="chroma-subsampling-test"] .status-line[data-tone="error"]{color:var(--danger)}
[data-tool-root="chroma-subsampling-test"] .result-surface{display:flex;flex:1;flex-direction:column;min-width:0;padding:18px;background:var(--bg-result);border:1px solid var(--border);border-radius:var(--radius)}
[data-tool-root="chroma-subsampling-test"] .stage-header{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:10px}
[data-tool-root="chroma-subsampling-test"] .stage-header__label{color:var(--text-tertiary);font-size:13px;font-weight:700}
[data-tool-root="chroma-subsampling-test"] .stage-header strong{font-size:15px}
[data-tool-root="chroma-subsampling-test"] .chroma-stage{position:relative;display:grid;aspect-ratio:16/9;min-height:240px;overflow:hidden;border:1px solid var(--gray-800);border-radius:var(--radius-sm);background:#7f7f7f;isolation:isolate}
[data-tool-root="chroma-subsampling-test"] .chroma-stage canvas{display:block;width:100%;height:100%;min-width:0;image-rendering:pixelated;touch-action:none}
[data-tool-root="chroma-subsampling-test"] .stage-fallback{position:absolute;inset:auto 12px 12px;margin:0;padding:8px;background:rgba(255,255,255,.9);color:#111}
[data-tool-root="chroma-subsampling-test"] .chroma-stage[data-rendered="true"] .stage-fallback{display:none}
[data-tool-root="chroma-subsampling-test"] .chroma-stage:fullscreen{width:100vw;height:100vh;min-height:100vh;aspect-ratio:auto;border:0;border-radius:0}
[data-tool-root="chroma-subsampling-test"] .chroma-stage:fullscreen canvas{width:100vw;height:100vh}
[data-tool-root="chroma-subsampling-test"] .fullscreen-controls{position:absolute;left:max(14px,env(safe-area-inset-left));right:max(14px,env(safe-area-inset-right));bottom:max(14px,env(safe-area-inset-bottom));z-index:3;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px;background:rgba(17,17,17,.9);color:#fff;border:1px solid rgba(255,255,255,.28);border-radius:6px}
[data-tool-root="chroma-subsampling-test"] .fullscreen-controls>div:first-child{display:grid;gap:2px}
[data-tool-root="chroma-subsampling-test"] .fullscreen-controls span{font-size:13px;color:rgba(255,255,255,.78)}
[data-tool-root="chroma-subsampling-test"] .fullscreen-button-row{display:flex;gap:7px}
[data-tool-root="chroma-subsampling-test"] .fullscreen-button-row button{min-width:42px;min-height:38px;border:1px solid #fff;border-radius:4px;background:#fff;color:#111;font:700 13px/1.2 inherit;cursor:pointer}
[data-tool-root="chroma-subsampling-test"] .observation-block{margin-top:16px;padding-top:16px;border-top:1px solid var(--border)}
[data-tool-root="chroma-subsampling-test"] .observation-block__heading{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;margin-bottom:10px}
[data-tool-root="chroma-subsampling-test"] .observation-block__heading p{margin:3px 0 0;color:var(--text-secondary)}
[data-tool-root="chroma-subsampling-test"] .result-badge{display:inline-flex;flex:0 0 auto;align-items:center;min-height:28px;padding:3px 9px;border:1px solid var(--border);border-radius:999px;background:#fff;font-size:13px;font-weight:700}
[data-tool-root="chroma-subsampling-test"] .result-surface[data-state="recorded"] .result-badge{background:#111;color:#fff;border-color:#111}
[data-tool-root="chroma-subsampling-test"] .result-summary{margin-top:16px;padding-top:16px;border-top:1px solid var(--border)}
[data-tool-root="chroma-subsampling-test"] .result-primary{display:grid;gap:3px}
[data-tool-root="chroma-subsampling-test"] .result-primary__label{color:var(--text-tertiary);font-size:13px;font-weight:700}
[data-tool-root="chroma-subsampling-test"] .result-primary__value{font-size:clamp(28px,4.5vw,48px);line-height:1.15;overflow-wrap:anywhere}
[data-tool-root="chroma-subsampling-test"] .result-primary__secondary{color:var(--text-secondary)}
[data-tool-root="chroma-subsampling-test"] .result-data-band{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));margin:16px 0 0;border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
[data-tool-root="chroma-subsampling-test"] .result-data-band>div{min-width:0;padding:10px}
[data-tool-root="chroma-subsampling-test"] .result-data-band>div+div{border-left:1px solid var(--border)}
[data-tool-root="chroma-subsampling-test"] .result-data-band dt{font-size:12px;color:var(--text-tertiary)}
[data-tool-root="chroma-subsampling-test"] .result-data-band dd{margin:3px 0 0;font-weight:700;font-variant-numeric:tabular-nums;overflow-wrap:anywhere}
[data-tool-root="chroma-subsampling-test"] .result-summary__note{margin:12px 0 0;color:var(--text-secondary)}
[data-tool-root="chroma-subsampling-test"] .result-summary__actions{display:flex;justify-content:flex-start;margin-top:12px}
[data-tool-root="chroma-subsampling-test"] .copy-fallback{margin-top:12px;padding:12px;background:var(--gray-100);border:1px solid var(--border);border-radius:var(--radius-sm)}
[data-tool-root="chroma-subsampling-test"] .copy-fallback label{display:block;margin-bottom:6px;font-weight:700}
[data-tool-root="chroma-subsampling-test"] .card-block{border:1px solid var(--border);border-radius:var(--radius);background:#fff;overflow:hidden}
[data-tool-root="chroma-subsampling-test"] .comparison-card{padding:18px}
[data-tool-root="chroma-subsampling-test"] .comparison-card>p{margin:0 0 14px;max-width:72ch}
[data-tool-root="chroma-subsampling-test"] .table-wrap{width:100%;overflow-x:auto}
[data-tool-root="chroma-subsampling-test"] table{width:100%;border-collapse:collapse;min-width:620px}
[data-tool-root="chroma-subsampling-test"] th,[data-tool-root="chroma-subsampling-test"] td{padding:11px 12px;border:1px solid var(--border);text-align:left;vertical-align:top}
[data-tool-root="chroma-subsampling-test"] thead th{background:var(--gray-100)}
[data-tool-root="chroma-subsampling-test"] tbody th{white-space:nowrap}
[data-tool-root="chroma-subsampling-test"] .comparison-note{margin:14px 0 0!important;color:var(--text-secondary)}
[data-tool-root="chroma-subsampling-test"] .acc+ .acc{border-top:1px solid var(--border)}
[data-tool-root="chroma-subsampling-test"] .acc summary{cursor:pointer;padding:13px 15px;font-weight:700;list-style-position:inside}
[data-tool-root="chroma-subsampling-test"] .acc-panel{padding:0 15px 15px}
[data-tool-root="chroma-subsampling-test"] .acc-panel p{margin:0 0 10px;max-width:72ch}
[data-tool-root="chroma-subsampling-test"] .acc-panel p:last-child{margin-bottom:0}
[data-tool-root="chroma-subsampling-test"] .source-list{margin:10px 0 0;padding-left:20px}
[data-tool-root="chroma-subsampling-test"] .source-list a{color:#111;text-underline-offset:3px}
[data-tool-root="chroma-subsampling-test"] .related-links{display:grid;grid-template-columns:1fr 1fr;gap:10px}
[data-tool-root="chroma-subsampling-test"] .related-link{display:grid;gap:4px;padding:12px;border:1px solid var(--border);border-radius:var(--radius-sm);color:#111;text-decoration:none}
[data-tool-root="chroma-subsampling-test"] .related-link:hover{background:var(--gray-100)}
[data-tool-root="chroma-subsampling-test"] .related-link span{color:var(--text-secondary)}
[data-tool-root="chroma-subsampling-test"] .noscript-note{margin-top:20px;padding:12px;border:1px solid var(--border);background:var(--gray-100)}
@media(max-width:900px){[data-tool-root="chroma-subsampling-test"]{padding:0 8px 40px}}
@media(max-width:720px){[data-tool-root="chroma-subsampling-test"] .workspace-grid{grid-template-columns:1fr;gap:8px}[data-tool-root="chroma-subsampling-test"] .input-panel,[data-tool-root="chroma-subsampling-test"] .result-panel{height:auto;padding:14px 12px}[data-tool-root="chroma-subsampling-test"] .related-links{grid-template-columns:1fr}}
@media(max-width:430px){[data-tool-root="chroma-subsampling-test"] .tool-page-header h1{font-size:27px}[data-tool-root="chroma-subsampling-test"] h2{font-size:21px}[data-tool-root="chroma-subsampling-test"] .segmented--three,[data-tool-root="chroma-subsampling-test"] .segmented--observations{grid-template-columns:1fr}[data-tool-root="chroma-subsampling-test"] .button-row{grid-template-columns:1fr}[data-tool-root="chroma-subsampling-test"] .btn{width:100%;min-height:44px}[data-tool-root="chroma-subsampling-test"] .chroma-stage{min-height:210px}[data-tool-root="chroma-subsampling-test"] .result-data-band{grid-template-columns:1fr 1fr}[data-tool-root="chroma-subsampling-test"] .result-data-band>div:nth-child(3){border-left:0;border-top:1px solid var(--border)}[data-tool-root="chroma-subsampling-test"] .result-data-band>div:nth-child(4){border-top:1px solid var(--border)}[data-tool-root="chroma-subsampling-test"] .fullscreen-controls{display:grid}[data-tool-root="chroma-subsampling-test"] .fullscreen-button-row{display:grid;grid-template-columns:repeat(4,1fr)}}
@media(prefers-reduced-motion:reduce){[data-tool-root="chroma-subsampling-test"] *{scroll-behavior:auto!important;animation:none!important;transition:none!important}}