[data-tool-root="gray-screen"]{
  --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;--bg-result:#fff;--text-primary:#111;--text-secondary:#444;--text-tertiary:#666;--border:#ddd;--border-strong:#222;--success:#276749;--danger:#a12424;--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="gray-screen"] *,[data-tool-root="gray-screen"] *::before,[data-tool-root="gray-screen"] *::after{box-sizing:border-box}
[data-tool-root="gray-screen"] [hidden]{display:none!important}
[data-tool-root="gray-screen"] .tool-page-header{padding:24px 0 18px}
[data-tool-root="gray-screen"] h1,[data-tool-root="gray-screen"] h2,[data-tool-root="gray-screen"] h3,[data-tool-root="gray-screen"] p{margin-top:0}
[data-tool-root="gray-screen"] h1{margin-bottom:8px;font-size:30px;line-height:1.2;letter-spacing:-.5px;font-weight:800}
[data-tool-root="gray-screen"] .page-description{max-width:72ch;margin-bottom:0;color:var(--text-secondary);font-size:16px}
[data-tool-root="gray-screen"] .tool-page-divider{height:1px;background:var(--border);margin-bottom:24px}
[data-tool-root="gray-screen"] .workspace-grid{display:grid;grid-template-columns:minmax(0,.96fr) minmax(0,1.04fr);gap:16px;align-items:stretch}
[data-tool-root="gray-screen"] .input-panel,[data-tool-root="gray-screen"] .result-panel{display:flex;min-width:0;flex-direction:column;background:var(--bg-workspace);border:1px solid var(--border);border-radius:6px;padding:20px}
[data-tool-root="gray-screen"] .input-panel>h3,[data-tool-root="gray-screen"] .result-panel>h3{margin-bottom:16px;font-size:18px;line-height:1.35}
[data-tool-root="gray-screen"] .field-group+.field-group{margin-top:14px}
[data-tool-root="gray-screen"] .field-label,[data-tool-root="gray-screen"] .field-heading label{display:block;font-weight:700}
[data-tool-root="gray-screen"] .field-label{margin-bottom:8px}
[data-tool-root="gray-screen"] .field-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:8px}
[data-tool-root="gray-screen"] .field-heading input[type="number"]{width:78px;min-height:40px;padding:6px 8px;border:1px solid var(--border-strong);border-radius:4px;background:#fff;color:var(--text-primary);font:inherit;font-variant-numeric:tabular-nums;text-align:center}
[data-tool-root="gray-screen"] .gray-code-range{display:block;width:100%;height:30px;margin:0;accent-color:var(--gray-900)}
[data-tool-root="gray-screen"] .field-help,[data-tool-root="gray-screen"] .field-error{margin:5px 0 0;font-size:13px}
[data-tool-root="gray-screen"] .field-help{color:var(--text-tertiary)}
[data-tool-root="gray-screen"] .field-error{color:var(--danger)}
[data-tool-root="gray-screen"] .segmented{display:grid;gap:1px;padding:1px;background:var(--border);border:1px solid var(--border);border-radius:8px;overflow:hidden}
[data-tool-root="gray-screen"] .segmented--preset{grid-template-columns:repeat(4,minmax(0,1fr))}
[data-tool-root="gray-screen"] .segmented--timer{grid-template-columns:repeat(4,minmax(0,1fr))}
[data-tool-root="gray-screen"] .segmented--observation{grid-template-columns:repeat(2,minmax(0,1fr))}
[data-tool-root="gray-screen"] .segmented__item{min-width:0;min-height:46px;padding:10px 12px;border:0;border-radius:0;background:#fff;color:var(--text-primary);font:inherit;font-weight:700;line-height:1.3;text-align:center;cursor:pointer;overflow-wrap:anywhere}
[data-tool-root="gray-screen"] .segmented__item:hover{background:var(--gray-100)}
[data-tool-root="gray-screen"] .segmented__item.is-active{background:var(--gray-900);color:#fff}
[data-tool-root="gray-screen"] button:focus-visible,[data-tool-root="gray-screen"] input:focus-visible,[data-tool-root="gray-screen"] textarea:focus-visible,[data-tool-root="gray-screen"] [tabindex]:focus-visible,[data-tool-root="gray-screen"] summary:focus-visible,[data-tool-root="gray-screen"] a:focus-visible{outline:3px solid var(--focus-ring);outline-offset:2px}
[data-tool-root="gray-screen"] .setup-checklist{margin:18px 0 0;padding:14px;border:1px solid var(--border);border-radius:6px;background:#fff}
[data-tool-root="gray-screen"] .setup-checklist legend{padding:0 6px;font-weight:700}
[data-tool-root="gray-screen"] .setup-checklist label{display:flex;align-items:flex-start;gap:9px;padding:7px 0;color:var(--text-secondary)}
[data-tool-root="gray-screen"] .setup-checklist input{flex:0 0 auto;width:18px;height:18px;margin:3px 0 0;accent-color:var(--gray-900)}
[data-tool-root="gray-screen"] .input-panel__footer{margin-top:18px;padding-top:16px;border-top:1px solid var(--border)}
[data-tool-root="gray-screen"] .button-row{display:flex;flex-wrap:wrap;gap:8px}
[data-tool-root="gray-screen"] .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="gray-screen"] .btn:hover{background:var(--gray-100)}
[data-tool-root="gray-screen"] .btn-primary{background:var(--gray-900);color:#fff}
[data-tool-root="gray-screen"] .btn-primary:hover{background:var(--gray-800)}
[data-tool-root="gray-screen"] .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="gray-screen"] .status-line[data-tone="error"]{color:var(--danger);border-color:var(--danger)}
[data-tool-root="gray-screen"] .status-line[data-tone="success"]{color:var(--success);border-color:var(--success)}
[data-tool-root="gray-screen"] .result-surface{display:grid;gap:14px;flex:1;background:var(--bg-result);border:1px solid var(--border);border-radius:6px;padding:16px}
[data-tool-root="gray-screen"] .gray-stage{position:relative;display:grid;place-items:center;width:100%;height:280px;overflow:hidden;border:1px solid var(--border-strong);border-radius:4px;background:#808080;color:#fff;touch-action:manipulation}
[data-tool-root="gray-screen"] .preview-hint{max-width:calc(100% - 24px);padding:6px 10px;border:1px solid currentColor;border-radius:999px;background:rgba(255,255,255,.13);font-size:13px;text-align:center}
[data-tool-root="gray-screen"] .gray-stage[data-text-tone="dark"]{color:#111}
[data-tool-root="gray-screen"] .gray-stage[data-text-tone="dark"] .preview-hint{background:rgba(255,255,255,.36)}
[data-tool-root="gray-screen"] .gray-stage:fullscreen{width:100vw;height:100vh;border:0;border-radius:0}
[data-tool-root="gray-screen"] .gray-stage:fullscreen .preview-hint{display:none}
[data-tool-root="gray-screen"] .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));display:flex;align-items:center;justify-content:space-between;gap:14px;padding:12px;border:1px solid rgba(255,255,255,.45);border-radius:6px;background:rgba(17,17,17,.86);color:#fff}
[data-tool-root="gray-screen"] .fullscreen-controls__text{display:grid;gap:2px}
[data-tool-root="gray-screen"] .fullscreen-controls__text span{font-size:13px;color:rgba(255,255,255,.76)}
[data-tool-root="gray-screen"] .fullscreen-button-row{display:flex;gap:7px}
[data-tool-root="gray-screen"] .fullscreen-button-row button{min-height:38px;padding:6px 11px;border:1px solid rgba(255,255,255,.6);border-radius:4px;background:#111;color:#fff;font:inherit;font-weight:700;cursor:pointer}
[data-tool-root="gray-screen"] .observation-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
[data-tool-root="gray-screen"] .observation-card{min-width:0;padding:14px;border:1px solid var(--border);border-radius:6px;background:var(--gray-100)}
[data-tool-root="gray-screen"] .observation-card__heading{margin-bottom:10px}
[data-tool-root="gray-screen"] .observation-card__heading strong{font-size:16px}
[data-tool-root="gray-screen"] .observation-card__heading p{margin:3px 0 0;color:var(--text-secondary);font-size:13px}
[data-tool-root="gray-screen"] .result-summary{padding:16px;border:1px solid var(--border);border-radius:6px;background:var(--gray-100)}
[data-tool-root="gray-screen"] .result-summary__header{display:flex;align-items:center;justify-content:space-between;gap:12px}
[data-tool-root="gray-screen"] .result-summary__eyebrow{font-weight:800}
[data-tool-root="gray-screen"] .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="gray-screen"] .result-primary{display:grid;gap:3px;margin-top:12px}
[data-tool-root="gray-screen"] .result-primary__value{font-size:clamp(28px,3vw,42px);line-height:1.15;font-variant-numeric:tabular-nums;overflow-wrap:anywhere}
[data-tool-root="gray-screen"] .result-primary__secondary{color:var(--text-secondary);font-weight:700;font-variant-numeric:tabular-nums}
[data-tool-root="gray-screen"] .result-data-band{display:grid;grid-template-columns:repeat(auto-fit,minmax(112px,1fr));gap:1px;margin:14px 0 0;padding:1px;border:1px solid var(--border);border-radius:6px;overflow:hidden;background:var(--border)}
[data-tool-root="gray-screen"] .result-data-band>div{min-width:0;padding:9px 11px;background:#fff}
[data-tool-root="gray-screen"] .result-data-band dt{color:var(--text-tertiary);font-size:13px;font-weight:700}
[data-tool-root="gray-screen"] .result-data-band dd{margin:2px 0 0;font-weight:800;font-variant-numeric:tabular-nums;overflow-wrap:anywhere}
[data-tool-root="gray-screen"] .result-summary__note{margin:12px 0 0;color:var(--text-secondary)}
[data-tool-root="gray-screen"] .result-summary__actions{margin-top:12px}
[data-tool-root="gray-screen"] .copy-fallback{margin-top:12px}
[data-tool-root="gray-screen"] .copy-fallback label{display:block;margin-bottom:6px;font-weight:700}
[data-tool-root="gray-screen"] .copy-fallback textarea{width:100%;min-height:90px;padding:10px;border:1px solid var(--border-strong);border-radius:4px;background:#fff;color:var(--text-primary);font:inherit;resize:vertical}
[data-tool-root="gray-screen"] .desc-section{margin-top:32px}
[data-tool-root="gray-screen"] .desc-section h2{position:relative;margin-bottom:16px;padding-left:12px;font-size:24px;line-height:1.3}
[data-tool-root="gray-screen"] .desc-section h2::before{content:"";position:absolute;left:0;top:.25em;width:3px;height:1em;background:var(--gray-900)}
[data-tool-root="gray-screen"] .card-block{padding:0 20px;border:1px solid var(--border);border-radius:6px;background:var(--gray-100)}
[data-tool-root="gray-screen"] .acc+.acc{border-top:1px solid var(--border)}
[data-tool-root="gray-screen"] .acc summary{display:flex;align-items:center;min-height:50px;font-size:16px;font-weight:800;cursor:pointer;list-style:none}
[data-tool-root="gray-screen"] .acc summary::-webkit-details-marker{display:none}
[data-tool-root="gray-screen"] .acc summary::after{content:"+";margin-left:auto;color:var(--text-tertiary);font-size:20px}
[data-tool-root="gray-screen"] .acc[open] summary::after{content:"−"}
[data-tool-root="gray-screen"] .acc-panel{padding:0 0 16px;color:var(--text-secondary)}
[data-tool-root="gray-screen"] .acc-panel p{margin:0 0 10px;max-width:72ch}
[data-tool-root="gray-screen"] .content-list,[data-tool-root="gray-screen"] .source-list{margin:8px 0 0;padding-left:20px;max-width:72ch}
[data-tool-root="gray-screen"] .content-list li+li,[data-tool-root="gray-screen"] .source-list li+li{margin-top:6px}
[data-tool-root="gray-screen"] .source-list a{color:var(--text-primary);text-underline-offset:3px}
[data-tool-root="gray-screen"] .related-tools-accordion{padding:0 20px;border:1px solid var(--border);border-radius:6px;background:var(--gray-100)}
[data-tool-root="gray-screen"] .related-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;padding-bottom:20px}
[data-tool-root="gray-screen"] .related-link{display:flex;min-width:0;min-height:92px;flex-direction:column;justify-content:center;padding:14px 16px;border:1px solid var(--border);border-radius:4px;background:#fff;color:var(--text-primary);text-decoration:none}
[data-tool-root="gray-screen"] .related-link:hover{border-color:var(--border-strong);background:var(--gray-50)}
[data-tool-root="gray-screen"] .related-link strong{font-size:16px;line-height:1.4}
[data-tool-root="gray-screen"] .related-link span{margin-top:5px;color:var(--text-secondary);font-size:14px;line-height:1.55}
[data-tool-root="gray-screen"] .noscript-note{margin-top:24px;padding:14px;border:1px solid var(--border-strong);border-radius:6px;background:#fff}
@media(max-width:900px){
  [data-tool-root="gray-screen"]{padding:0 8px 32px}
}
@media(max-width:720px){
  [data-tool-root="gray-screen"] .workspace-grid{grid-template-columns:minmax(0,1fr)}
  [data-tool-root="gray-screen"] .input-panel,[data-tool-root="gray-screen"] .result-panel{padding:14px}
  [data-tool-root="gray-screen"] .gray-stage{height:300px}
  [data-tool-root="gray-screen"] .related-links{grid-template-columns:minmax(0,1fr)}
}
@media(max-width:430px){
  [data-tool-root="gray-screen"] h1{font-size:27px}
  [data-tool-root="gray-screen"] .desc-section h2{font-size:21px}
  [data-tool-root="gray-screen"] .segmented--preset,[data-tool-root="gray-screen"] .segmented--timer{grid-template-columns:repeat(2,minmax(0,1fr))}
  [data-tool-root="gray-screen"] .observation-grid{grid-template-columns:minmax(0,1fr)}
  [data-tool-root="gray-screen"] .button-row,[data-tool-root="gray-screen"] .fullscreen-controls{align-items:stretch;flex-direction:column}
  [data-tool-root="gray-screen"] .btn{width:100%}
  [data-tool-root="gray-screen"] .gray-stage{height:250px}
  [data-tool-root="gray-screen"] .fullscreen-button-row{display:grid;grid-template-columns:1fr 1fr}
}
@media(prefers-reduced-motion:reduce){
  [data-tool-root="gray-screen"] *{scroll-behavior:auto!important;animation:none!important;transition:none!important}
}