.physics-view{inset:0;background:#f6eee3;color:#332719;font:13px -apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif;overflow:hidden}.physics-view button,.physics-view input,.physics-view select{font:inherit;color:inherit}.physics-view button{cursor:pointer;touch-action:manipulation;transition:transform .16s ease,background .16s ease}.physics-view button:active{transform:scale(.96)}.physics-view button:disabled{opacity:.4;cursor:default}.physics-view [hidden]{display:none!important}.physics-library{height:100%;overflow:auto;padding:0 12px 30px}.physics-library-head{height:58px;display:flex;align-items:center;gap:8px;position:sticky;top:0;background:#f6eee3;z-index:1}.physics-library-head span{font-size:14px;flex:1}.physics-library-head button{height:44px;padding:0 10px}.physics-back{width:38px;font-size:24px!important}.physics-library-tabs{display:flex;gap:6px;margin:8px 0 24px}.physics-library-tabs button{padding:9px 16px;border-radius:10px}.physics-library-tabs [aria-pressed=true]{background:#e8dfd2}.physics-examples{max-width:1120px;margin:auto}.physics-examples section{margin-bottom:26px}.physics-examples h2{font-size:12px;font-weight:500;color:#786c5d;margin:0 0 10px 6px}.physics-example-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:10px}.physics-example{position:relative;text-align:left;display:flex;flex-direction:column;justify-content:center;gap:6px;min-height:94px;padding:16px 35px 16px 16px;border:1px solid #dfd5c7;border-radius:14px;background:#fbfaf6}.physics-example span:first-child{font-size:14px}.physics-example small{font-size:11px;color:#786c5d}.physics-example-arrow{position:absolute;right:16px;font-size:20px;color:#786c5d}.physics-saved{max-width:1120px;margin:auto;display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:10px}.physics-workbench{position:absolute;inset:0;overflow:hidden;background:#fff}.physics-workbench[data-flat=true]{background:#fff;color:#000}#physics-canvas{width:100%;height:100%;display:block;touch-action:none}.physics-chrome{position:absolute;top:0;left:0;right:0;height:58px;display:flex;gap:8px;align-items:center;padding:0 12px;background:#f6eee3f0;z-index:4}.physics-chrome button{width:38px;height:44px;font-size:24px}.physics-name{flex:1;font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.physics-phases{position:absolute;z-index:4;top:58px;left:50%;transform:translateX(-50%);display:flex;gap:3px;padding:3px;background:#f0e7da;border-radius:14px;width:254px;max-width:calc(100% - 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16px));max-height:calc(100% - 100px);overflow:auto;overscroll-behavior:contain;padding:6px 13px 14px;background:#fbfaf6;border-radius:20px 20px 12px 12px;box-shadow:0 8px 28px #33271922;z-index:28;animation:physics-sheet-in .28s cubic-bezier(.2,.8,.2,1)}.physics-sheet-grip{width:30px;height:3px;background:#dfd5c7;border-radius:3px;margin:0 auto 4px}.physics-sheet header{display:flex;align-items:center;justify-content:space-between;min-height:40px;font-size:14px;font-weight:500}.physics-sheet header button{height:36px;width:36px;font-size:20px}.physics-sheet-body{display:flex;flex-direction:column;gap:9px}.physics-sheet-body>button{padding:12px;border-radius:10px;text-align:center;background:#f0e7da}.physics-slider{display:grid;grid-template-columns:76px 1fr 80px;gap:8px;align-items:center;min-height:44px;font-size:12px}.physics-slider output{font-size:11px;text-align:right}.physics-slider input{width:100%;accent-color:#332719}.physics-component-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}.physics-component-grid button{min-height:44px;padding:10px;background:#f0e7da;border-radius:12px}.physics-field{display:flex;align-items:center;gap:8px;min-width:0;font-size:11px}.physics-field span{min-width:70px}.physics-field input,.physics-field select{min-width:0;flex:1;width:100%;height:36px;border:1px solid #dfd5c7;background:#fff;border-radius:8px;padding:6px;outline-offset:2px}.physics-inspector-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}.physics-inspector-grid .physics-field{display:flex;flex-direction:column;align-items:stretch;gap:4px}.physics-inspector-grid .physics-field input{width:100%}.physics-fixed{display:flex;align-items:center;gap:6px;padding:6px}.physics-fixed input{accent-color:#332719}.physics-sheet-actions{display:flex;justify-content:space-between;gap:8px}.physics-sheet-actions button{flex:1;min-height:44px;border-radius:12px;background:#f0e7da}.physics-object-reading{display:grid;grid-template-columns:auto 1fr;gap:12px;margin:10px}.physics-object-reading dd{margin:0;text-align:right}.physics-analysis{z-index:24;width:330px;height:320px;padding:10px 12px;border-color:#dfd5c7;background:#fbfaf6;border-radius:16px;max-height:none}.physics-analysis .monotonicity-bar{margin:-6px 6px 4px}.physics-analysis-head{display:flex;align-items:center;justify-content:space-between;font-size:12px}.physics-analysis-head button{font-size:21px;height:28px;width:28px;transform:rotate(0deg)}.physics-metrics{display:flex;flex-wrap:wrap;gap:3px;padding:6px 0}.physics-metrics button{padding:6px 8px;font-size:11px;border-radius:8px}.physics-chart{display:block;width:100%;min-height:90px;max-height:170px;overflow:visible}.physics-chart path{fill:none;stroke:#332719;stroke-linecap:round;stroke-linejoin:round}.physics-chart-axis{stroke-width:1}.physics-chart-curve{stroke-width:1.6}.physics-chart text{fill:#332719;font:10px -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}.physics-analysis-values{margin:10px 0 0;display:grid;grid-template-columns:1fr 1fr;gap:9px;font-size:11px;font-variant-numeric:tabular-nums}.physics-analysis-values div{display:flex;justify-content:space-between;gap:6px}.physics-analysis-values dt{color:#786c5d}.physics-analysis-values dd{margin:0}.physics-error{position:absolute;top:105px;left:50%;transform:translateX(-50%);max-width:calc(100% - 30px);padding:10px;border-radius:10px;background:#fff;color:#a33;z-index:29;font-size:12px}.physics-workbench[data-flat=true] .physics-chrome,.physics-workbench[data-flat=true] .physics-bottom{background:#fffffff2}.physics-workbench[data-flat=true] .physics-phases{background:#f2f2f2}.physics-workbench[data-flat=true] .physics-phases [aria-selected=true]{background:#fff;color:#000}.physics-workbench[data-flat=true] .physics-phases button{color:#555}.physics-workbench[data-flat=true] .physics-build-tools{border:1px solid #000;background:#fff}.physics-workbench[data-flat=true] .physics-undo,.physics-workbench[data-flat=true] .physics-top-actions button,.physics-workbench[data-flat=true] .physics-reading{background:#fff;color:#000}.physics-workbench[data-flat=true] .physics-primary{background:#000;color:#fff}.physics-workbench[data-flat=true] .physics-analysis{background:#fff;border:1px solid #000;color:#000}.physics-workbench[data-flat=true] .physics-chart path{stroke:#000}.physics-workbench[data-flat=true] .physics-chart text{fill:#000}.physics-workbench[data-flat=true] [aria-pressed=true]{background:#ededed}.physics-workbench[data-flat=true] .physics-analysis-values dt{color:#555}@keyframes physics-sheet-in{from{opacity:0;translate:0 24px}to{opacity:1;translate:0 0}}@media(max-width:600px){.physics-library-head{padding-top:env(safe-area-inset-top)}.physics-example-grid{grid-template-columns:1fr}.physics-example{min-height:80px}.physics-inspector-grid{gap:6px}.physics-analysis{width:300px}.physics-phases{top:54px}.physics-slider{grid-template-columns:66px 1fr 72px}.physics-build-tools{top:155px}.physics-name{font-size:13px}}@media(prefers-reduced-motion:reduce){.physics-sheet{animation:none}.physics-view button{transition:none}}


/* Lens material adaptation; scene geometry, paper rendering and hit areas unchanged. */
.physics-view{background:var(--lg-color-page);color:var(--lg-color-text)}.physics-library{background:radial-gradient(ellipse at 0 0,#ddeef581,transparent 55%),radial-gradient(ellipse at 100% 100%,#eee4eb5c,transparent 60%),var(--lg-color-page)}.physics-library-head{background:#f7f8faf5}.physics-library-head span{color:var(--lg-color-text)}.physics-library-tabs button{color:var(--lg-color-muted);transition:background var(--lg-duration-normal),transform var(--lg-duration-normal) var(--lg-ease-spring)}.physics-library-tabs [aria-pressed=true]{background:var(--ui-glass);box-shadow:var(--ui-glass-shadow);color:#205bb4}
.physics-examples h2{color:#77818e}.physics-example{background:var(--ui-glass);border-color:var(--ui-glass-edge);box-shadow:var(--ui-glass-shadow);color:var(--lg-color-text);transition:background var(--lg-duration-normal),box-shadow var(--lg-duration-normal),transform var(--lg-duration-normal) var(--lg-ease-spring)}.physics-example small,.physics-example-arrow{color:#77818e}.physics-example:hover{background:linear-gradient(125deg,#fff,#edf4fc);box-shadow:inset 0 1px 0 #fff,0 14px 26px -16px #21355245}.physics-library-head [data-new]{color:#205bb4}
.physics-chrome,.physics-workbench[data-flat=true] .physics-chrome{background:linear-gradient(#ffffffdd,#ffffff00)}.physics-bottom,.physics-workbench[data-flat=true] .physics-bottom{background:linear-gradient(#ffffff00,#ffffffe8)}.physics-name{color:var(--lg-color-text)}.physics-chrome button{color:#56677c}
.physics-phases,.physics-workbench[data-flat=true] .physics-phases{background:linear-gradient(145deg,#edf3f9ed,#e7edf4d9);box-shadow:inset 0 1px 0 #fff,0 7px 20px -14px #21355245}.physics-phases button,.physics-workbench[data-flat=true] .physics-phases button{color:var(--lg-color-muted)}.physics-phases [aria-selected=true],.physics-workbench[data-flat=true] .physics-phases [aria-selected=true]{background:var(--ui-glass);box-shadow:var(--ui-glass-shadow);color:#205bb4}
.physics-top-actions button,.physics-undo,.physics-reading,.physics-build-tools,.physics-workbench[data-flat=true] .physics-top-actions button,.physics-workbench[data-flat=true] .physics-undo,.physics-workbench[data-flat=true] .physics-reading,.physics-workbench[data-flat=true] .physics-build-tools{background:var(--ui-glass);color:var(--lg-color-text);border-color:var(--ui-glass-edge);box-shadow:var(--ui-glass-shadow)}.physics-undo button,.physics-workbench[data-flat=true] .physics-undo button{background:none;box-shadow:none}.physics-build-tools{border-color:var(--ui-glass-edge)}
.physics-view [aria-pressed=true],.physics-workbench[data-flat=true] [aria-pressed=true]{background:linear-gradient(140deg,#d7e8ff,#e9f2ff);color:#205bb4;box-shadow:inset 0 1px 0 #ffffffc9}.physics-view button{transition:background var(--lg-duration-fast),transform var(--lg-duration-normal) var(--lg-ease-spring)}.physics-view button:active{transform:scale(.97)}.physics-bottom button{background:var(--ui-glass);box-shadow:var(--ui-glass-shadow);color:var(--lg-color-text)}.physics-view .physics-primary,.physics-workbench[data-flat=true] .physics-primary{background:linear-gradient(135deg,#367fee,#2365ce);color:#fff;box-shadow:inset 0 1px 0 #ffffff80,0 8px 20px -12px #1b56b4a0}
.physics-scrim{background:#15263b25}.physics-sheet{background:var(--ui-glass);box-shadow:inset 0 1px 0 #fff,0 24px 70px -25px #21355260;color:var(--lg-color-text)}.physics-sheet-grip{background:#b2bfce}.physics-sheet-body>button,.physics-component-grid button,.physics-sheet-actions button{background:#e7eef6bf;color:var(--lg-color-text);box-shadow:inset 0 1px 0 #ffffffc9}.physics-field input,.physics-field select{border-color:#cdd9e7;background:#ffffffcf;color:var(--lg-color-text);box-shadow:inset 0 1px 3px #21355206}.physics-field input:focus-visible,.physics-field select:focus-visible{outline:2px solid var(--lg-color-focus);outline-offset:1px}.physics-slider input,.physics-fixed input{accent-color:var(--lg-color-accent)}
.physics-analysis,.physics-workbench[data-flat=true] .physics-analysis{background:var(--ui-glass);border-color:var(--ui-glass-edge);color:var(--lg-color-text);box-shadow:var(--ui-glass-shadow)}.physics-analysis-values dt,.physics-workbench[data-flat=true] .physics-analysis-values dt{color:var(--lg-color-muted)}.physics-chart path,.physics-workbench[data-flat=true] .physics-chart path{stroke:#22252b}.physics-chart text,.physics-workbench[data-flat=true] .physics-chart text{fill:#596575}.physics-error{background:#fff5f4;color:#a33b37;box-shadow:var(--ui-glass-shadow)}
@supports(backdrop-filter:blur(1px)){.physics-phases,.physics-build-tools,.physics-sheet,.physics-analysis{backdrop-filter:blur(10px) saturate(1.08)}}
@media(prefers-reduced-transparency:reduce){.physics-phases,.physics-build-tools,.physics-sheet,.physics-analysis{background:#f6f9fc;backdrop-filter:none}}
@media(prefers-reduced-motion:reduce){.physics-view button,.physics-library-tabs button,.physics-example{transition:none}}
@media(forced-colors:active){.physics-view button,.physics-sheet,.physics-reading,.physics-build-tools,.physics-analysis{background:Canvas;color:CanvasText;box-shadow:none;border-color:CanvasText;backdrop-filter:none}.physics-view [aria-pressed=true],.physics-phases [aria-selected=true]{outline:1px solid Highlight}}

.physics-phases{width:178px}.physics-observe-actions{display:flex;gap:6px;pointer-events:auto}.physics-top-actions .physics-analyze[aria-pressed=true]{color:#205bb4;background:linear-gradient(140deg,#d7e8ff,#e9f2ff)}
.physics-sheet{left:0;top:0;bottom:auto;transform:none;max-height:none;display:flex;flex-direction:column;overflow:visible;animation:none;container-type:inline-size}.physics-sheet-grip{display:none}.physics-sheet>.monotonicity-bar{height:18px;min-height:18px;margin:0 22px}.physics-sheet>header{flex-shrink:0}.physics-sheet-body{min-height:0;flex:1;overflow:auto;padding-right:4px}.physics-sheet-body h3{font-size:12px;font-weight:500;margin:5px 0}.physics-component-grid{grid-template-columns:repeat(auto-fit,minmax(min(120px,100%),1fr))}.physics-inspector-grid{grid-template-columns:repeat(auto-fit,minmax(min(150px,100%),1fr))}.physics-analysis .monotonicity-content{touch-action:pan-y}.physics-view .float-handle,.physics-view .resize-corner{touch-action:none!important}.physics-sheet .monotonicity-corner{z-index:6}


/* Quiet, consistent library; the full-screen simulation controls stay unchanged. */
.physics-library{background:#f6f7f9;padding:0 max(20px,env(safe-area-inset-left)) 48px}.physics-library-head,.physics-library-tabs,.physics-examples,.physics-saved{max-width:1140px;margin-left:auto;margin-right:auto}.physics-library-head{height:82px;background:#f6f7f9f5;gap:12px;padding:0 2px}.physics-library-head span{font-size:18px;font-weight:550;letter-spacing:.02em}.physics-library-head .physics-back{width:32px;color:#69717d}.physics-library-head [data-new]{height:36px;padding:0 16px;background:#256ed6;color:#fff;border-radius:10px;font-size:13px;box-shadow:0 2px 5px #1852a51a}.physics-library-tabs{gap:24px;padding:0 0 0 4px;margin-top:0;margin-bottom:30px;border-bottom:1px solid #e3e6eb}.physics-library-tabs button{position:relative;padding:13px 0 14px;border-radius:0;background:none;color:#7b8491;font-size:13px}.physics-library-tabs [aria-pressed=true]{background:none;box-shadow:none;color:#1e2938}.physics-library-tabs [aria-pressed=true]:after{content:"";position:absolute;bottom:-1px;left:0;right:0;height:2px;border-radius:2px;background:#256ed6}.physics-examples section{margin-bottom:28px}.physics-examples h2{font-size:12px;line-height:18px;font-weight:500;color:#8a929d;margin:0 0 10px 2px;letter-spacing:.035em}.physics-example-grid,.physics-saved{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.physics-example{min-height:96px;padding:19px 34px 19px 18px;gap:7px;border:1px solid #e3e7ed;border-radius:13px;background:#fff;box-shadow:0 2px 4px #15263b03;transition:border-color .18s ease,box-shadow .18s ease,transform .24s var(--ease)}.physics-example span:first-child{font-size:14px;font-weight:500;line-height:21px}.physics-example small{font-size:11px;line-height:16px;color:#87909c}.physics-example-arrow{right:16px;font-size:17px;color:#b0b7c1}.physics-example:hover{background:#fff;border-color:#bdcee3;box-shadow:0 5px 15px #25466c09;transform:translateY(-1px)}.physics-example:focus-visible{outline:2px solid #7ca9e9;outline-offset:3px}.physics-example:active{transform:scale(.99)}
@media(max-width:900px){.physics-example-grid,.physics-saved{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:560px){.physics-library{padding:0 16px 32px}.physics-library-head{height:72px;gap:6px}.physics-library-head span{font-size:16px}.physics-library-head [data-new]{padding:0 12px;font-size:12px}.physics-library-tabs{margin-bottom:24px}.physics-example-grid,.physics-saved{grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.physics-example{min-height:84px;padding:15px 34px 15px 16px}.physics-examples section{margin-bottom:25px}}
@media(prefers-reduced-motion:reduce){.physics-example{transition:none}}
@media(forced-colors:active){.physics-library,.physics-library-head,.physics-example,.physics-example:hover{background:Canvas;color:CanvasText;box-shadow:none}.physics-library-head [data-new]{background:ButtonFace;color:ButtonText;border:1px solid ButtonText}.physics-library-tabs [aria-pressed=true]:after{background:Highlight}}

/* Scene previews are fixed images: no per-card animation or ongoing redraw. */
.physics-preview-card{display:block;width:100%;min-width:0;padding:0;overflow:hidden;text-align:left;border:1px solid #e3e7ed;border-radius:13px;background:#fff;box-shadow:0 2px 4px #15263b03;transition:border-color .18s,box-shadow .18s,transform .24s var(--ease)}
.physics-card-preview{display:block;position:relative;aspect-ratio:16/9;overflow:hidden;background:#fff;border-bottom:1px solid #edf0f4}.physics-card-preview img{display:block;width:100%;height:100%;object-fit:contain}.physics-card-preview img:not([src]){visibility:hidden}.physics-card-name{display:block;padding:13px 16px;font-size:14px;line-height:21px;font-weight:500;overflow-wrap:anywhere;color:var(--lg-color-text)}
.physics-preview-card:hover{border-color:#bdcee3;box-shadow:0 5px 15px #25466c09;transform:translateY(-1px)}.physics-preview-card:focus-visible{outline:2px solid #7ca9e9;outline-offset:3px}.physics-uploads{max-width:1140px;margin:0 auto}.physics-public-pages{display:flex;justify-content:center;gap:18px;margin-top:20px}.physics-public-pages button{padding:8px 10px;color:#63738a}.physics-public-status{font-size:13px;color:#87909c;text-align:center;padding:30px 0}
.physics-chrome [data-upload]{width:auto;height:36px;padding:0 12px;font-size:13px;color:#205bb4}.physics-publish-dialog,.physics-publication-dialog{width:min(520px,calc(100vw - 32px));max-height:calc(100dvh - 32px);overflow:auto}.physics-publish-dialog form,.physics-publish-dialog label{display:grid;gap:8px}.physics-publish-dialog form{gap:16px}.physics-publish-dialog label{font-size:12px;color:#718093}.physics-publish-dialog input,.physics-publish-dialog textarea{box-sizing:border-box;width:100%;min-width:0;resize:vertical;border:1px solid #dce3ed;border-radius:11px;background:#ffffffb5;padding:11px 13px;font:14px/1.6 'Jieximian Sans',sans-serif;color:#253448}.physics-publish-dialog textarea{min-height:140px;max-height:45dvh}.physics-publish-dialog [role=status],.physics-publication-dialog [role=status]{margin:0;color:#a33b37;font-size:12px}.physics-publish-dialog .account-primary{font-size:14px}.physics-public-question{white-space:pre-wrap;overflow-wrap:anywhere;font-size:14px;line-height:1.8}.physics-publication-dialog h2{overflow-wrap:anywhere}.physics-publication-dialog footer{gap:16px;justify-content:flex-end}.physics-publication-dialog [data-retire-publication]{color:#a33b37}
@media(prefers-reduced-motion:reduce){.physics-preview-card{transition:none}}

/* Sharing controls are limited to saved scenes; existing library/card styling stays in place. */
.physics-cloud-actions{grid-column:1/-1;display:flex;align-items:center;flex-wrap:wrap;gap:10px}.physics-share-help{display:inline-grid;place-items:center;width:22px;height:22px;padding:0;border:1px solid #aab6c5;border-radius:50%;background:transparent;color:#718093;font-size:12px}.physics-saved-item{position:relative;min-width:0}.physics-saved-item>.physics-example{width:100%;height:100%;padding-right:74px}.physics-saved-share{position:absolute;right:12px;top:50%;translate:0 -50%;padding:8px 10px;background:transparent;color:#205bb4;font-size:12px}.physics-share-dialog{width:min(440px,calc(100vw - 32px));max-height:calc(100dvh - 32px);overflow:auto;scrollbar-width:none}.physics-share-dialog [data-share-content],.physics-share-dialog form,.physics-share-dialog label{display:grid;gap:12px}.physics-share-dialog p{font-size:13px;line-height:1.7;overflow-wrap:anywhere}.physics-share-dialog .physics-share-name{margin:0;font-weight:500;color:#253448}.physics-share-dialog .physics-share-expiry{margin:0;font-size:12px;color:#718093}.physics-share-dialog input{box-sizing:border-box;width:100%;min-width:0;border:1px solid #dce3ed;border-radius:11px;background:#ffffffb5;padding:11px 12px;font:14px/1.6 'Jieximian Sans',sans-serif;color:#253448}.physics-share-dialog .physics-share-code{font:17px/1.6 ui-monospace,Consolas,monospace;letter-spacing:.035em;text-align:center}.physics-share-dialog .physics-share-actions{display:flex;gap:16px;align-items:center;justify-content:flex-end;flex-wrap:wrap}.physics-share-dialog .physics-share-actions button{padding:10px 0;font-size:13px}.physics-share-dialog [role=status]{color:#a33b37;min-height:18px;margin-bottom:0;font-size:12px}.physics-share-dialog .account-primary{padding:12px 16px!important}