[data-tool-root="dead-pixel-test"]{--gray-50:#fbfbfb;--gray-100:#f7f7f7;--gray-150:#f2f2f2;--gray-200:#eee;--gray-300:#ddd;--gray-500:#999;--gray-600:#666;--gray-700:#444;--gray-800:#222;--gray-900:#111;--bg-canvas:#fff;--bg-workspace:#f2f2f2;--text-primary:#111;--text-secondary:#444;--text-tertiary:#666;--border:#ddd;--border-strong:#222;--focus-ring:rgba(17,17,17,.35);box-sizing:border-box;width:100%;margin:0;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="dead-pixel-test"] *,[data-tool-root="dead-pixel-test"] *::before,[data-tool-root="dead-pixel-test"] *::after{box-sizing:border-box}
[data-tool-root="dead-pixel-test"] .tool-page-header{padding:24px 0 18px}
[data-tool-root="dead-pixel-test"] h1,[data-tool-root="dead-pixel-test"] h2,[data-tool-root="dead-pixel-test"] h3,[data-tool-root="dead-pixel-test"] p{margin-top:0}
[data-tool-root="dead-pixel-test"] h1{margin-bottom:8px;font-size:30px;line-height:1.2;letter-spacing:-.5px;font-weight:800}
[data-tool-root="dead-pixel-test"] .page-description{max-width:72ch;margin-bottom:0;color:var(--text-secondary);font-size:16px}
[data-tool-root="dead-pixel-test"] .tool-page-divider{height:1px;margin-bottom:24px;background:var(--border)}
[data-tool-root="dead-pixel-test"] .workspace-grid{display:grid;grid-template-columns:minmax(0,.98fr) minmax(0,1.02fr);gap:16px;align-items:stretch}
[data-tool-root="dead-pixel-test"] .input-panel,[data-tool-root="dead-pixel-test"] .result-panel{display:flex;min-width:0;flex-direction:column;padding:20px;border:1px solid var(--border);border-radius:6px;background:var(--bg-workspace)}
[data-tool-root="dead-pixel-test"] .input-panel>h3,[data-tool-root="dead-pixel-test"] .result-panel>h3{margin-bottom:16px;font-size:18px;line-height:1.35}
[data-tool-root="dead-pixel-test"] .field-group+.field-group{margin-top:14px}
[data-tool-root="dead-pixel-test"] .field-label{display:block;margin-bottom:8px;font-weight:700}
[data-tool-root="dead-pixel-test"] .segmented{display:grid;gap:4px;padding:4px;border:1px solid var(--border);border-radius:6px;background:var(--gray-200)}
[data-tool-root="dead-pixel-test"] .segmented--colors{grid-template-columns:repeat(3,minmax(0,1fr))}
[data-tool-root="dead-pixel-test"] .segmented--three{grid-template-columns:repeat(3,minmax(0,1fr))}
[data-tool-root="dead-pixel-test"] .segmented--four{grid-template-columns:repeat(4,minmax(0,1fr))}
[data-tool-root="dead-pixel-test"] .segmented__item{min-height:40px;padding:7px 8px;border:0;border-radius:4px;background:transparent;color:var(--text-primary);font:inherit;font-weight:700;line-height:1.3;cursor:pointer;overflow-wrap:anywhere}
[data-tool-root="dead-pixel-test"] .segmented__item:hover{background:var(--gray-150)}
[data-tool-root="dead-pixel-test"] .segmented__item.is-active{background:var(--gray-900);color:#fff}
[data-tool-root="dead-pixel-test"] .segmented__item:focus-visible,[data-tool-root="dead-pixel-test"] .btn:focus-visible,[data-tool-root="dead-pixel-test"] .test-stage:focus-visible,[data-tool-root="dead-pixel-test"] .acc summary:focus-visible,[data-tool-root="dead-pixel-test"] .related-link:focus-visible,[data-tool-root="dead-pixel-test"] .fullscreen-button-row button:focus-visible{outline:3px solid var(--focus-ring);outline-offset:2px}
[data-tool-root="dead-pixel-test"] .setup-checklist{margin:18px 0 0;padding:14px;border:1px solid var(--border);border-radius:6px;background:#fff}
[data-tool-root="dead-pixel-test"] .setup-checklist legend{padding:0 6px;font-weight:700}
[data-tool-root="dead-pixel-test"] .setup-checklist label{display:flex;align-items:flex-start;gap:9px;padding:7px 0;color:var(--text-secondary)}
[data-tool-root="dead-pixel-test"] .setup-checklist input{width:18px;height:18px;margin:3px 0 0;accent-color:var(--gray-900)}
[data-tool-root="dead-pixel-test"] .input-panel__footer{margin-top:18px;padding-top:16px;border-top:1px solid var(--border)}
[data-tool-root="dead-pixel-test"] .button-row,[data-tool-root="dead-pixel-test"] .mark-tools{display:flex;flex-wrap:wrap;gap:8px}
[data-tool-root="dead-pixel-test"] .btn{min-height:44px;padding:10px 16px;border:1px solid var(--border-strong);border-radius:4px;background:#fff;color:var(--text-primary);font:inherit;font-weight:700;cursor:pointer}
[data-tool-root="dead-pixel-test"] .btn:hover{background:var(--gray-100)}
[data-tool-root="dead-pixel-test"] .btn-primary{background:var(--gray-900);color:#fff}
[data-tool-root="dead-pixel-test"] .btn-primary:hover{background:var(--gray-800)}
[data-tool-root="dead-pixel-test"] .status-line{min-height:0;margin:10px 0 0;padding:10px 12px;border:1px solid var(--border);border-radius:6px;background:#fff;color:var(--text-secondary)}
[data-tool-root="dead-pixel-test"] .result-surface{display:flex;flex-direction:column;gap:14px;flex:1;padding:16px;border:1px solid var(--border);border-radius:6px;background:#fff}
[data-tool-root="dead-pixel-test"] .test-stage{position:relative;height:310px;overflow:hidden;border:1px solid var(--border-strong);border-radius:4px;background:#fff;cursor:crosshair;touch-action:none}
[data-tool-root="dead-pixel-test"] .marker-layer{position:absolute;inset:0;pointer-events:none}
[data-tool-root="dead-pixel-test"] .pixel-marker{position:absolute;width:26px;height:26px;transform:translate(-50%,-50%);border:2px solid #fff;border-radius:50%;background:#111;color:#fff;box-shadow:0 0 0 2px #111;display:grid;place-items:center;font-size:12px;font-weight:800;line-height:1;font-variant-numeric:tabular-nums}
[data-tool-root="dead-pixel-test"] .pixel-marker[data-type="dark"]{background:#fff;color:#111;border-color:#111;box-shadow:0 0 0 2px #fff}
[data-tool-root="dead-pixel-test"] .pixel-marker[data-type="stuck"]{background:#777;color:#fff}
[data-tool-root="dead-pixel-test"] .marker-layer[hidden]{display:none}
[data-tool-root="dead-pixel-test"] .fullscreen-controls{position:absolute;left:max(12px,env(safe-area-inset-left));right:max(12px,env(safe-area-inset-right));bottom:max(12px,env(safe-area-inset-bottom));display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px;border:1px solid rgba(255,255,255,.45);border-radius:6px;background:rgba(17,17,17,.9);color:#fff;cursor:default}
[data-tool-root="dead-pixel-test"] .fullscreen-controls[hidden]{display:none}
[data-tool-root="dead-pixel-test"] .fullscreen-controls__text{display:grid;gap:2px}
[data-tool-root="dead-pixel-test"] .fullscreen-controls__text span{font-size:13px;color:rgba(255,255,255,.76)}
[data-tool-root="dead-pixel-test"] .fullscreen-button-row{display:flex;gap:6px}
[data-tool-root="dead-pixel-test"] .fullscreen-button-row button{min-height:38px;padding:6px 10px;border:1px solid rgba(255,255,255,.55);border-radius:4px;background:#111;color:#fff;font:inherit;cursor:pointer}
[data-tool-root="dead-pixel-test"] .marking-card,[data-tool-root="dead-pixel-test"] .result-summary{margin:0;padding:14px;border:1px solid var(--border);border-radius:6px;background:var(--gray-100)}
[data-tool-root="dead-pixel-test"] .result-lower-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,220px),1fr));gap:14px}
[data-tool-root="dead-pixel-test"] .card-heading-row{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;margin-bottom:10px}
[data-tool-root="dead-pixel-test"] .card-heading-row p{margin:3px 0 0;color:var(--text-secondary)}
[data-tool-root="dead-pixel-test"] .result-badge{flex:0 0 auto;padding:3px 9px;border:1px solid var(--border-strong);border-radius:999px;background:#fff;font-size:13px;font-weight:700}
[data-tool-root="dead-pixel-test"] .mark-tools{margin-bottom:10px}
[data-tool-root="dead-pixel-test"] .mark-tools .btn{min-height:38px;padding:7px 10px}
[data-tool-root="dead-pixel-test"] .marker-list{max-height:164px;margin:0;padding:0;overflow:auto;list-style:none;border:1px solid var(--border);border-radius:6px;background:#fff}
[data-tool-root="dead-pixel-test"] .marker-list li{display:grid;grid-template-columns:auto 1fr auto;gap:8px;align-items:center;padding:8px 10px;border-bottom:1px solid var(--border)}
[data-tool-root="dead-pixel-test"] .marker-list li:last-child{border-bottom:0}
[data-tool-root="dead-pixel-test"] .marker-list__empty{display:block!important;color:var(--text-secondary)}
[data-tool-root="dead-pixel-test"] .marker-list__index{display:inline-grid;width:24px;height:24px;place-items:center;border-radius:50%;background:#111;color:#fff;font-size:12px;font-weight:800}
[data-tool-root="dead-pixel-test"] .marker-list__meta{color:var(--text-secondary);font-size:13px}
[data-tool-root="dead-pixel-test"] .result-primary{display:grid;gap:4px}
[data-tool-root="dead-pixel-test"] .result-primary__label{color:var(--text-tertiary);font-size:13px;font-weight:700}
[data-tool-root="dead-pixel-test"] .result-primary__value{font-size:clamp(30px,3vw,42px);line-height:1.1;font-variant-numeric:tabular-nums}
[data-tool-root="dead-pixel-test"] .result-primary__secondary{color:var(--text-secondary)}
[data-tool-root="dead-pixel-test"] .result-data-band{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));margin:14px 0 0;border:1px solid var(--border);border-radius:6px;overflow:hidden;background:#fff}
[data-tool-root="dead-pixel-test"] .result-data-band div{min-width:0;padding:9px 10px;border-right:1px solid var(--border);border-bottom:1px solid var(--border)}
[data-tool-root="dead-pixel-test"] .result-data-band div:nth-child(2n){border-right:0}
[data-tool-root="dead-pixel-test"] .result-data-band div:nth-last-child(-n+2){border-bottom:0}
[data-tool-root="dead-pixel-test"] .result-data-band dt{color:var(--text-tertiary);font-size:13px;font-weight:700}
[data-tool-root="dead-pixel-test"] .result-data-band dd{margin:2px 0 0;font-weight:700;font-variant-numeric:tabular-nums;overflow-wrap:anywhere}
[data-tool-root="dead-pixel-test"] .result-summary__note{margin:12px 0 0;color:var(--text-secondary)}
[data-tool-root="dead-pixel-test"] .result-summary__actions{margin-top:12px}
[data-tool-root="dead-pixel-test"] .copy-fallback{margin-top:12px}
[data-tool-root="dead-pixel-test"] .copy-fallback label{display:block;margin-bottom:6px;font-weight:700}
[data-tool-root="dead-pixel-test"] .copy-fallback textarea{width:100%;min-height:92px;padding:10px;border:1px solid var(--border-strong);border-radius:4px;background:#fff;color:var(--text-primary);font:inherit;resize:vertical}
[data-tool-root="dead-pixel-test"] .desc-section{margin-top:32px}
[data-tool-root="dead-pixel-test"] .desc-section h2{position:relative;margin-bottom:16px;padding-left:12px;font-size:24px;line-height:1.3}
[data-tool-root="dead-pixel-test"] .desc-section h2::before{content:"";position:absolute;left:0;top:.25em;width:3px;height:1em;background:var(--gray-900)}
[data-tool-root="dead-pixel-test"] .card-block{padding:16px;border:1px solid var(--border);border-radius:6px;background:var(--gray-100)}
[data-tool-root="dead-pixel-test"] .table-wrap{overflow-x:auto}
[data-tool-root="dead-pixel-test"] table{width:100%;border-collapse:collapse;background:#fff}
[data-tool-root="dead-pixel-test"] th,[data-tool-root="dead-pixel-test"] td{padding:12px;border:1px solid var(--border);text-align:left;vertical-align:top}
[data-tool-root="dead-pixel-test"] thead th{background:var(--gray-200)}
[data-tool-root="dead-pixel-test"] .acc{border:1px solid var(--border);border-radius:6px;background:#fff}
[data-tool-root="dead-pixel-test"] .acc+.acc{margin-top:8px}
[data-tool-root="dead-pixel-test"] .acc summary{padding:13px 14px;font-weight:700;cursor:pointer}
[data-tool-root="dead-pixel-test"] .acc-panel{padding:0 14px 14px;color:var(--text-secondary)}
[data-tool-root="dead-pixel-test"] .acc-panel p:last-child{margin-bottom:0}
[data-tool-root="dead-pixel-test"] .source-list{margin:0;padding-left:20px}
[data-tool-root="dead-pixel-test"] .source-list a{color:var(--text-primary);text-underline-offset:3px}
[data-tool-root="dead-pixel-test"] .related-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;padding-top:4px}
[data-tool-root="dead-pixel-test"] .related-link{display:grid;gap:4px;padding:14px;border:1px solid var(--border);border-radius:6px;background:var(--gray-50);color:var(--text-primary);text-decoration:none}
[data-tool-root="dead-pixel-test"] .related-link:hover{border-color:var(--border-strong);background:#fff}
[data-tool-root="dead-pixel-test"] .related-link span{color:var(--text-secondary)}
[data-tool-root="dead-pixel-test"] .noscript-note{margin-top:24px;padding:14px;border:1px solid var(--border-strong);border-radius:6px;background:#fff}
[data-tool-root="dead-pixel-test"] .test-stage:fullscreen{width:100vw;height:100vh;border:0;border-radius:0}
@media (max-width:900px){[data-tool-root="dead-pixel-test"]{padding:0 8px 32px}}
@media (max-width:720px){[data-tool-root="dead-pixel-test"] .workspace-grid{grid-template-columns:minmax(0,1fr)}[data-tool-root="dead-pixel-test"] .input-panel,[data-tool-root="dead-pixel-test"] .result-panel{padding:14px}[data-tool-root="dead-pixel-test"] .result-surface{padding:14px}[data-tool-root="dead-pixel-test"] .test-stage{height:320px}}
@media (max-width:430px){[data-tool-root="dead-pixel-test"] h1{font-size:27px}[data-tool-root="dead-pixel-test"] .segmented--colors,[data-tool-root="dead-pixel-test"] .segmented--four{grid-template-columns:repeat(2,minmax(0,1fr))}[data-tool-root="dead-pixel-test"] .segmented--three{grid-template-columns:minmax(0,1fr)}[data-tool-root="dead-pixel-test"] .button-row,[data-tool-root="dead-pixel-test"] .fullscreen-controls{align-items:stretch;flex-direction:column}[data-tool-root="dead-pixel-test"] .btn{width:100%}[data-tool-root="dead-pixel-test"] .mark-tools .btn{width:auto;flex:1 1 auto}[data-tool-root="dead-pixel-test"] .result-data-band{grid-template-columns:minmax(0,1fr)}[data-tool-root="dead-pixel-test"] .result-data-band div,[data-tool-root="dead-pixel-test"] .result-data-band div:nth-child(2n),[data-tool-root="dead-pixel-test"] .result-data-band div:nth-last-child(-n+2){border-right:0;border-bottom:1px solid var(--border)}[data-tool-root="dead-pixel-test"] .result-data-band div:last-child{border-bottom:0}[data-tool-root="dead-pixel-test"] .related-links{grid-template-columns:minmax(0,1fr)}[data-tool-root="dead-pixel-test"] .fullscreen-button-row{display:grid;grid-template-columns:1fr 1fr}}
@media (prefers-reduced-motion:reduce){[data-tool-root="dead-pixel-test"] *{scroll-behavior:auto!important}}