:root{color-scheme:dark;font-family:Inter,"SF Pro Text","PingFang SC","Microsoft YaHei",sans-serif;font-synthesis:none;--bg:#101114;--surface:#17181c;--canvas:#111216;--raised:#24262c;--line:#303239;--muted:#a2a5ae;--dim:#858995;--text:#f0f1f4;--cyan:#6c9fff;--comparison:#e6e9ed;--on-accent:#ffffff;color:var(--text);background:var(--bg)}:root[data-theme=light]{color-scheme:light;--bg:#f5f6f8;--surface:#ffffff;--canvas:#f4f5f7;--raised:#f0f2f5;--line:#e5e7eb;--muted:#626773;--dim:#858b97;--text:#20232b;--cyan:#356df3;--comparison:#727d88;--on-accent:#fff}*{box-sizing:border-box}body{margin:0;min-width:320px}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{border:0;cursor:pointer;background:transparent;color:inherit}a{color:inherit;text-decoration:none}[hidden]{display:none!important}button:disabled{opacity:.32;cursor:default}button,a,summary{transition:background .15s,color .15s}button:hover:not(:disabled),summary:hover{background:var(--raised)}button:focus-visible,a:focus-visible,summary:focus-visible,input:focus-visible,select:focus-visible,#viewport:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}.icon-sprite{position:absolute;width:0;height:0;overflow:hidden;pointer-events:none}.icon{display:block;width:19px;height:19px;fill:none;stroke:currentColor;stroke-width:1.55;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}.site-header{height:72px;padding:0 30px;display:flex;align-items:center;gap:23px;border-bottom:1px solid var(--line);background:var(--surface)}.brand{display:flex;align-items:center;gap:11px;flex-shrink:0}.brand b{font-size:19px;font-weight:550;letter-spacing:.5px}.brand img{display:block}.header-divider{height:23px;width:1px;background:var(--line);flex-shrink:0}.site-header h1{font-size:17px;font-weight:450;margin:0;white-space:nowrap}.header-actions{margin-left:auto;display:flex;align-items:center;gap:17px}.theme-switch{display:flex;align-items:center;gap:2px;padding:4px;border:1px solid var(--line);border-radius:20px}.theme-switch button{width:29px;height:29px;border-radius:50%;display:grid;place-items:center;color:var(--muted)}.theme-switch button[aria-pressed=true]{background:var(--raised);color:var(--cyan)}.theme-switch .icon{width:16px;height:16px}.quiet-button{display:flex;align-items:center;gap:7px;border-radius:6px;padding:9px;font-size:12px;white-space:nowrap}.count-badge{font-size:10px;color:var(--cyan);background:var(--raised);padding:2px 5px;border-radius:4px}.workspace{display:grid;grid-template-columns:minmax(0,1fr) clamp(260px,26vw,350px);background:var(--surface);min-height:calc(100dvh - 72px)}.scene{min-width:0;display:flex;flex-direction:column}.scene-status{position:absolute;top:27px;left:26px;display:flex;gap:7px;align-items:center;font-size:10px;color:var(--dim);z-index:2;pointer-events:none}.scene-status>span:first-child{width:5px;height:5px;border-radius:50%;background:currentColor}.scene-status.running{color:var(--cyan)}.scene-status.complete{color:var(--muted)}#viewport{height:calc(100dvh - 204px);min-height:390px;position:relative;touch-action:none;background:var(--canvas);isolation:isolate;flex:1}#viewport canvas{display:block;width:100%;height:100%;cursor:grab}#viewport canvas:active{cursor:grabbing}.viewport-tools{position:absolute;top:16px;right:20px;z-index:3;display:flex;align-items:center;gap:3px;padding:4px;border:1px solid var(--line);border-radius:7px;background:color-mix(in srgb,var(--surface) 88%,transparent);backdrop-filter:blur(10px)}.viewport-tools button{height:30px;padding:5px 9px;display:flex;align-items:center;justify-content:center;gap:6px;border-radius:4px;color:var(--muted);font-size:11px}.viewport-tools button.active{color:var(--cyan);background:var(--raised)}.viewport-tools .icon{width:16px;height:16px}.tool-divider{width:1px;height:20px;background:var(--line);margin:0 5px;flex-shrink:0}.viewport-tools .icon-button{width:30px;padding:6px}.scene-help,.model-info{position:relative}.scene-help summary,.model-info summary{display:grid;place-items:center;list-style:none;width:28px;height:28px;cursor:pointer;border-radius:4px;color:var(--dim)}summary::-webkit-details-marker{display:none}.scene-help p,.model-info p{position:absolute;right:0;top:100%;margin:7px 0 0;padding:12px;border:1px solid var(--line);border-radius:7px;background:var(--surface);font-size:11px;line-height:1.8;white-space:nowrap;box-shadow:0 5px 18px #0001;color:var(--muted);z-index:10}.model-info .icon{width:14px;height:14px}.legend{display:flex;gap:19px;position:absolute;left:26px;bottom:19px;font-size:10px;color:var(--muted);pointer-events:none}.legend>span{display:flex;align-items:center;gap:6px}.cyan-dot,.comparison-dot{width:5px;height:5px;border-radius:50%;background:var(--cyan)}.comparison-dot{background:var(--comparison)}#fallback{position:absolute;top:35%;left:10%;right:10%;padding:20px;background:var(--surface);border:1px solid var(--line);border-radius:8px;font-size:13px;z-index:4}.metrics{min-height:52px;padding:0 29px;display:flex;align-items:center;gap:48px;border-top:1px solid var(--line);background:var(--surface);flex-shrink:0}.metrics>div{display:flex;align-items:baseline;gap:12px;white-space:nowrap}.metrics small{font-family:Georgia,serif;font-style:italic;font-size:13px;color:var(--muted)}.metrics strong{font-family:"SF Mono",Consolas,monospace;font-size:14px;font-weight:400;font-variant-numeric:tabular-nums}.metrics em{font-style:normal;font-size:10px;color:var(--muted);margin-left:4px}.metrics>div:first-child strong{color:var(--cyan)}.transport{height:80px;padding:0 26px;display:flex;align-items:center;gap:18px;border-top:1px solid var(--line);background:var(--surface);flex-shrink:0}.primary,.secondary{width:42px;height:42px;flex-shrink:0;border-radius:50%;display:grid;place-items:center}.primary{color:var(--on-accent);background:var(--cyan)}.primary:hover:not(:disabled){background:var(--cyan);filter:brightness(1.08)}.primary .icon{width:21px;height:21px}.secondary{border:1px solid var(--line);color:var(--muted);width:36px;height:36px}.timeline{display:flex;align-items:center;gap:15px;flex:1;min-width:60px}.timeline>span{font-family:Consolas,monospace;color:var(--muted);font-size:10px;min-width:31px;text-align:right}input[type=range]{appearance:none;display:block;width:100%;height:3px;border-radius:3px;cursor:pointer;background:linear-gradient(90deg,var(--cyan) var(--fill,45%),var(--line) var(--fill,45%));margin:12px 0;min-width:0}input[type=range]::-webkit-slider-thumb{appearance:none;width:11px;height:11px;border-radius:50%;background:var(--cyan);border:none}input[type=range]::-moz-range-thumb{width:11px;height:11px;border:0;border-radius:50%;background:var(--cyan)}input[type=range]:hover::-webkit-slider-thumb{box-shadow:0 0 0 4px color-mix(in srgb,var(--cyan) 12%,transparent)}select{border:0;background:var(--surface);color:var(--text);font-size:12px;padding:6px 4px;cursor:pointer}.transport>.tool-divider{margin:0}.transport .quiet-button{padding:8px 3px}.inspector{border-left:1px solid var(--line);background:var(--surface);min-width:0}.inspector-tabs{height:68px;display:flex;align-items:stretch;gap:12px;padding:0 21px;border-bottom:1px solid var(--line)}.inspector-tabs button{position:relative;padding:0 15px;font-size:14px;color:var(--muted)}.inspector-tabs button[aria-selected=true]{color:var(--cyan)}.inspector-tabs button[aria-selected=true]:after{content:"";position:absolute;bottom:-1px;height:2px;background:var(--cyan);left:0;right:0}.settings,.lesson{padding:33px 25px}.parameter+.parameter{margin-top:35px}.slider-label{display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:12px}.slider-label em,.prediction-row small em{font-family:Georgia,serif;font-style:italic;margin-left:7px;color:var(--muted)}.slider-label b{font-family:Consolas,monospace;font-size:16px;font-weight:400;white-space:nowrap}.slider-label small{font-family:inherit;font-size:10px;margin-left:4px;color:var(--muted)}.slider-row{display:flex;align-items:center;gap:12px;margin-top:14px}.slider-row>span{font-size:9px;color:var(--dim);min-width:12px}.slider-row>span:last-child{text-align:right}.toggles{display:grid;gap:23px;margin:40px 0}.check{display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:12px;cursor:pointer}.check input{appearance:none;width:31px;height:18px;border-radius:12px;background:var(--line);margin:0;position:relative;cursor:pointer;flex-shrink:0}.check input:before{content:"";position:absolute;left:3px;top:3px;width:12px;height:12px;border-radius:50%;background:var(--muted);transition:transform .15s}.check input:checked{background:var(--cyan)}.check input:checked:before{background:var(--surface);transform:translateX(13px)}.prediction{border-top:1px solid var(--line);padding-top:22px}.prediction-title{display:flex;align-items:center;justify-content:space-between;font-size:11px;color:var(--muted);margin-bottom:12px}.prediction-row{display:flex;justify-content:space-between;align-items:center;padding:12px 0}.prediction-row small{font-size:12px;font-weight:400}.prediction-row b{font-size:14px;font-family:Consolas,monospace;font-weight:400;color:var(--cyan)}.prediction-row b em{font-style:normal;font-size:10px;color:var(--muted);margin-left:4px}.lesson-top{display:flex;justify-content:space-between;font-size:11px;color:var(--muted)}.step-dots{display:flex;gap:7px;margin:23px 0 30px}.step-dots button{position:relative;flex:1;height:3px;background:var(--line);padding:0;border-radius:3px}.step-dots button:before{content:"";position:absolute;inset:-8px 0}.step-dots button.passed{background:var(--cyan)}.lesson h2{font-size:17px;font-weight:500;margin:0 0 17px}.lesson>p{font-size:12px;line-height:1.9;color:var(--muted);min-height:46px}.formula{font-family:Georgia,serif;padding:19px 8px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);font-size:16px;text-align:center;margin:26px 0;color:var(--text)}.stepnav{display:flex;justify-content:space-between}.icon-button{display:grid;place-items:center;width:32px;height:32px;border-radius:5px;color:var(--muted)}.notebook{border-top:1px solid var(--line);background:var(--surface);padding:24px 30px}.record-heading{display:flex;align-items:center;justify-content:space-between}.record-heading h2{font-size:14px;font-weight:500;margin:0}.record-heading h2 small{font-size:10px;color:var(--dim);font-weight:400;margin-left:15px}.record-actions{display:flex;gap:10px}.table-wrap{overflow:auto;margin-top:18px}table{border-collapse:collapse;width:100%;min-width:460px;font-size:12px;text-align:left;font-variant-numeric:tabular-nums}th,td{padding:12px 20px;border-top:1px solid var(--line);font-weight:400}th{font-size:10px;color:var(--muted)}td{color:var(--text)}#empty td{text-align:center;padding:22px;color:var(--dim);font-size:11px}.toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%,8px);background:var(--surface);color:var(--text);border:1px solid var(--line);padding:11px 17px;border-radius:8px;box-shadow:0 5px 20px #0001;opacity:0;pointer-events:none;transition:opacity .2s,transform .2s;font-size:12px;z-index:30}.toast.visible{opacity:1;transform:translate(-50%,0)}.focus-mode .workspace{grid-template-columns:1fr}.focus-mode .inspector{display:none}
@media(min-width:1600px){.workspace{grid-template-columns:minmax(0,1fr) 370px}.settings,.lesson{padding:40px 34px}.parameter+.parameter{margin-top:45px}.toggles{margin:50px 0;gap:28px}}
@media(max-width:1000px){.site-header{padding:0 22px;gap:17px;height:66px}.site-header h1{font-size:15px}.brand b{font-size:17px}.header-actions{gap:12px}.workspace{grid-template-columns:minmax(0,1fr) 260px;min-height:calc(100dvh - 66px)}#viewport{height:calc(100dvh - 194px)}.viewport-tools{right:14px;top:14px}.scene-status{left:19px;top:27px}.metrics{padding:0 22px;gap:30px;min-height:50px}.transport{padding:0 20px;gap:13px;height:78px}.transport .quiet-button>span{display:none}.transport .tool-divider{display:none}.settings,.lesson{padding:30px 23px}.inspector-tabs{height:64px;padding:0 15px}.legend{left:22px}.header-actions .header-divider{display:none}}
@media(max-width:700px){.site-header{height:62px;padding:0 14px;gap:12px}.brand img{width:27px;height:27px}.brand b{font-size:16px}.brand{gap:7px}.site-header>.header-divider{height:18px}.site-header h1{font-size:13px}.header-actions{gap:6px}.theme-switch{padding:3px;gap:0}.theme-switch button{width:24px;height:26px}.theme-switch .icon{width:14px;height:14px}.record-word{display:none}#toggle-records{padding:5px}.workspace{display:flex;flex-direction:column;min-height:0}.scene{width:100%}#viewport{height:52dvh;min-height:320px;flex:none}.inspector{border-left:0;border-top:1px solid var(--line)}.inspector-tabs{height:48px;padding:0 18px}.inspector-tabs button{font-size:13px;padding:0 18px}.settings{display:grid;grid-template-columns:1fr 1fr;gap:22px 30px;padding:25px 22px}.parameter+.parameter{margin-top:0}.toggles{margin:0;gap:20px;align-content:center}.prediction{border:0;border-left:1px solid var(--line);padding:0 0 0 24px}.prediction-title{margin:0}.prediction-row{padding:8px 0}.slider-label{font-size:11px;gap:4px}.slider-label b{font-size:14px}.slider-label small{font-size:9px}.slider-label em{margin-left:3px}.slider-row{gap:8px}.metrics{gap:34px;min-height:45px;padding:0 20px}.metrics strong{font-size:13px}.metrics>div{gap:8px}.transport{height:68px;gap:13px;padding:0 18px}.primary{width:38px;height:38px}.secondary{width:32px;height:32px}.timeline{gap:7px}.timeline>span{font-size:9px;min-width:26px}.transport select{font-size:11px;max-width:55px}.lesson{padding:24px}.lesson>p{min-height:0}.formula{margin:18px 0}.step-dots{margin:15px 0 20px}.notebook{padding:20px}.legend{bottom:15px;font-size:9px}.scene-status{font-size:9px}.focus-mode #viewport{height:calc(100dvh - 175px)}.focus-mode .scene{min-height:calc(100dvh - 62px)}}
@media(max-width:390px){.site-header h1{display:none}.site-header>.header-divider{display:none}.header-actions{margin-left:auto}.metrics{gap:25px}.transport{gap:9px}.settings{gap:20px}.slider-label em{display:none}.prediction{padding-left:15px}.viewport-tools button{padding:5px 7px}.scene-status{left:16px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
@media(max-width:390px){.site-header{gap:8px}.site-header h1{display:block;font-size:12px}.brand b{font-size:14px}.brand img{width:25px;height:25px}.header-actions{gap:3px}.theme-switch button{width:22px}.header-actions .quiet-button{padding:4px}}

/* Tabs use a compact indicator; hovering must not paint a full-height block. */
.inspector-tabs button:hover:not(:disabled){background:transparent;color:var(--text)}
.inspector-tabs button[aria-selected=true]{color:var(--text)}
.inspector-tabs button[aria-selected=true]:after{left:50%;right:auto;width:22px;height:2px;border-radius:2px;transform:translateX(-50%)}

/* Restrained neutral surfaces with a single blue interaction accent. */
.theme-switch{background:var(--raised);border-color:transparent}.theme-switch button[aria-pressed=true]{background:var(--surface);color:var(--text);box-shadow:0 1px 4px #00000012}.viewport-tools{border-color:color-mix(in srgb,var(--line) 75%,transparent);box-shadow:0 3px 14px #00000005}.viewport-tools button.active{background:color-mix(in srgb,var(--cyan) 11%,var(--surface));color:var(--cyan)}.primary{box-shadow:0 4px 12px color-mix(in srgb,var(--cyan) 22%,transparent)}.check input:checked:before{background:#fff}.prediction-row b{color:var(--text)}.metrics>div:first-child strong{color:var(--text)}.inspector-tabs button[aria-selected=true]{font-weight:550}.slider-label b{font-weight:500}input[type=range]::-webkit-slider-thumb{width:13px;height:13px;background:var(--surface);border:3px solid var(--cyan);box-shadow:0 1px 3px #0002}input[type=range]::-moz-range-thumb{width:8px;height:8px;background:var(--surface);border:3px solid var(--cyan);box-shadow:0 1px 3px #0002}
.back-home{display:grid;place-items:center;width:28px;height:28px;border-radius:5px;color:var(--muted);margin-right:-12px}.back-home:hover{background:var(--raised)}@media(max-width:700px){.back-home{width:22px;margin-right:-7px}.site-header>.header-divider{display:none}}
.theme-switch{border-radius:999px}.theme-switch button{border-radius:50%}
.extended-lab .metrics{gap:22px}.extended-lab .metrics>div{min-width:0;gap:8px}.extended-lab .metrics small{font-family:inherit;font-style:normal;font-size:10px;max-width:100px}.extended-lab .metrics strong{font-size:12px}.extended-lab .prediction-row{gap:12px}.extended-lab .prediction-row b{max-width:58%;text-align:right;font-size:12px;overflow-wrap:anywhere}.extended-lab .formula{font-size:14px;line-height:1.7;overflow-wrap:anywhere}.extended-lab .model-info p{white-space:normal;width:250px}.extended-lab .lesson>p{min-height:0}
@media(max-width:700px){.extended-lab .metrics{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;padding:9px 15px}.extended-lab .metrics>div{display:block;white-space:normal}.extended-lab .metrics small{display:block;font-size:9px;margin-bottom:4px}.extended-lab .metrics strong{font-size:11px}.extended-lab .metrics em{font-size:9px}.extended-lab .slider-label small{font-size:8px}.extended-lab .slider-label b{font-size:12px}.extended-lab .prediction-row b{font-size:10px}}
.extended-lab .site-header h1{min-width:0;overflow:hidden;text-overflow:ellipsis;flex-shrink:1}.extended-lab .header-actions{flex-shrink:0}
@media(max-width:700px){.extended-lab .slider-label{flex-wrap:wrap;row-gap:5px}.extended-lab .slider-label small{display:inline-block;max-width:85px;white-space:normal;overflow-wrap:anywhere;vertical-align:baseline}}
/* Projectile exhibit: restrained blue studio, roomy canvas, compact instrument panel. */
.projectile-lab{--bg:#080f1d;--surface:#0d1727;--raised:#1b2b43;--line:#24344c;--muted:#9cacc4;--dim:#7588a3;--text:#e9f1ff;--canvas:#080f1d}
[data-theme=light] .projectile-lab{--bg:#eef3f9;--surface:#fff;--raised:#eaf0f8;--line:#d6e0ed;--muted:#536783;--dim:#6a7c94;--text:#172a44;--canvas:#eaf0f7}
.projectile-lab .site-header{background:var(--bg)}
.projectile-lab .inspector{background:linear-gradient(155deg,var(--surface),var(--bg))}
.projectile-lab .viewport-tools{border-radius:999px;padding:5px;background:color-mix(in srgb,var(--surface) 85%,transparent)}
.projectile-lab .viewport-tools button{border-radius:999px}
.projectile-lab .scene-status{letter-spacing:1px;color:var(--muted)}
.scene-readout{position:absolute;left:26px;top:62px;pointer-events:none;display:grid;gap:7px;z-index:2}.scene-readout small{font-size:10px;color:var(--dim)}.scene-readout b{font:400 20px Consolas,monospace;color:var(--text)}
.landing-feedback{position:absolute;bottom:54px;left:50%;transform:translateX(-50%);padding:12px 24px;border:1px solid var(--line);background:color-mix(in srgb,var(--surface) 90%,transparent);border-radius:14px;font-size:13px;text-align:center;pointer-events:none;color:var(--text);white-space:nowrap}.landing-feedback span{display:block;font-size:10px;color:var(--muted);margin-top:5px}
.projectile-lab .presets{display:flex;gap:7px;margin-top:25px}.projectile-lab .presets button{flex:1;border:1px solid var(--line);border-radius:999px;padding:8px;font-size:11px;color:var(--muted)}.projectile-lab .presets button.selected{border-color:var(--cyan);background:color-mix(in srgb,var(--cyan) 12%,transparent);color:var(--cyan)}
.projectile-lab .metrics{gap:30px}.projectile-lab .metrics strong{font-size:13px}.projectile-lab .prediction{padding:20px;border:1px solid var(--line);border-radius:14px;background:color-mix(in srgb,var(--raised) 35%,transparent)}
@media(max-width:1000px){.projectile-lab .metrics{gap:20px;padding:12px 20px;display:grid;grid-template-columns:repeat(4,minmax(0,1fr))}.projectile-lab .metrics>div{display:grid;gap:7px}.projectile-lab .metrics strong{font-size:12px}}
@media(max-width:700px){.projectile-lab .settings{gap:20px}.projectile-lab .presets{margin:0;grid-column:1/-1;grid-row:2}.projectile-lab .prediction{padding:14px}.projectile-lab .metrics{gap:9px}.scene-readout{left:20px;top:55px}.scene-readout b{font-size:15px}.projectile-lab .viewport-tools button span{display:none}.projectile-lab #viewport{height:56dvh;min-height:360px}}
.spatial-plot{position:absolute;right:20px;bottom:22px;width:180px;padding:9px 12px;border:1px solid var(--line);border-radius:12px;background:color-mix(in srgb,var(--surface) 88%,transparent);color:var(--cyan);pointer-events:none}.spatial-plot small{font-size:10px;color:var(--muted)}.spatial-plot svg{display:block;width:100%;height:58px}@media(max-width:700px){.spatial-plot{width:130px;right:12px;bottom:35px;padding:6px 9px}.spatial-plot svg{height:40px}}
.galvanic-overlays{position:absolute;inset:0;pointer-events:none;z-index:3}.part-chooser,.principle-layers{pointer-events:auto;position:absolute;display:flex;gap:4px;padding:5px;border:1px solid var(--line);border-radius:999px;background:color-mix(in srgb,var(--surface) 94%,transparent);backdrop-filter:blur(10px)}.part-chooser{left:22px;top:54px}.principle-layers{right:20px;bottom:18px}.part-chooser button,.principle-layers button{font-size:11px;padding:7px 11px;border-radius:999px;color:var(--muted)}.part-chooser button[aria-pressed=true],.principle-layers button[aria-pressed=true]{background:var(--raised);color:var(--cyan)}.part-info{pointer-events:auto;position:absolute;left:22px;bottom:50px;max-width:300px;padding:17px 20px;border:1px solid var(--line);border-radius:14px;background:var(--surface);box-shadow:0 12px 35px #0002}.part-info b{font-size:13px}.part-info p{font-size:12px;color:var(--muted);line-height:1.7;margin:10px 0}.part-info code{font-size:12px;color:var(--cyan)}.part-close{position:absolute;right:7px;top:5px;border-radius:50%;font-size:18px;color:var(--muted)}.galvanic-experience .legend{bottom:24px}.comparison-task{margin-top:26px;border-top:1px solid var(--line);padding-top:22px}.task-heading{display:flex;justify-content:space-between;font-size:12px}.task-heading span{font:11px Consolas,monospace;color:var(--muted)}.task-prompt,.task-message{font-size:11px;color:var(--muted);line-height:1.8}.task-start,.task-save{width:100%;border:1px solid var(--line);border-radius:999px;padding:10px;font-size:12px;background:var(--raised);color:var(--cyan)}.task-groups{display:flex;gap:5px;margin:16px 0 12px}.task-groups button{flex:1;border:1px solid var(--line);border-radius:999px;padding:8px 4px;font-size:11px}.task-groups button[aria-pressed=true]{border-color:var(--cyan);color:var(--cyan);background:var(--raised)}.task-groups button.saved:after{content:' ✓';color:var(--cyan)}.fixed-resistance{display:block;font-size:10px;color:var(--muted);margin-bottom:13px}.task-exit{display:block;margin:9px auto;font-size:10px;color:var(--muted);padding:5px}.task-chart{margin-top:18px;padding:10px;border:1px solid var(--line);border-radius:12px}.task-chart svg{display:block;width:100%;height:auto}.task-chart text{fill:var(--muted);font:10px sans-serif}.task-chart path{stroke:var(--line);fill:none}.task-chart rect{fill:var(--cyan)}
@media(max-width:700px){.part-chooser{top:52px;left:14px}.part-chooser button,.principle-layers button{font-size:10px;padding:6px 9px}.principle-layers{right:12px;bottom:10px}.galvanic-experience .legend{bottom:51px;left:16px}.part-info{left:12px;right:12px;bottom:55px;max-width:none;padding:12px 16px}.part-info p{font-size:11px;margin:7px 0}.galvanic-experience .comparison-task{grid-column:1/-1;margin-top:0}.galvanic-experience .scene-help p{max-width:260px;white-space:normal}}
.galvanic-experience .metrics{transition:background .3s}.galvanic-experience .metrics.parameter-changed{background:color-mix(in srgb,var(--cyan) 17%,var(--surface))}
.task-predict{margin:12px 0}.task-predict small{font-size:11px;line-height:1.7;color:var(--muted)}.task-predict>div{display:flex;gap:6px;margin-top:8px}.task-predict button{flex:1;padding:7px;border:1px solid var(--line);border-radius:999px;font-size:11px}.task-predict button[aria-pressed=true]{border-color:var(--cyan);color:var(--cyan);background:var(--raised)}
.guided-experience .prediction-pending strong{visibility:hidden}.guided-experience:has(.prediction-pending) .spatial-plot{visibility:hidden}.prediction-pending:after{content:'先预测，再观察';font-size:10px;color:var(--cyan)}.guided-task .stage-groups{display:grid;grid-template-columns:1fr 1fr}.guided-task .stage-groups button{font-size:10px;line-height:1.5;border-radius:12px}.guide-results{width:100%;border-collapse:collapse;font-size:10px}.guide-results th,.guide-results td{padding:7px 3px;text-align:left;border-bottom:1px solid var(--line);overflow-wrap:anywhere}.guide-results th{font-size:9px;font-weight:400;color:var(--muted)}.observation-overlays .part-info p{max-width:270px}.observation-overlays .part-chooser{max-width:calc(100% - 40px);flex-wrap:wrap;border-radius:16px}.observation-overlays .part-chooser button{font-size:10px}.guided-experience .settings{padding-top:23px}.guided-task .task-chart{padding:8px}.guided-task .task-message{font-size:11px}@media(max-width:700px){.guided-experience .comparison-task{grid-column:1/-1;margin-top:0}.observation-overlays .part-chooser{left:12px;right:12px;max-width:none;top:54px;gap:0}.observation-overlays .part-chooser button{font-size:9px;padding:5px 7px}.observation-overlays .part-info{bottom:40px}.prediction-pending:after{display:none}}
.guide-results{min-width:0;table-layout:fixed}.guide-results th,.guide-results td{padding:7px 3px;border-top:0;border-bottom:1px solid var(--line);white-space:normal;word-break:break-word}
.galvanic-experience .prediction-pending strong{visibility:hidden}
.guided-task .task-heading,.galvanic-experience .task-heading{align-items:center;gap:8px}.guided-task .model-info,.galvanic-experience .comparison-task .model-info{margin-left:auto}.guided-task .model-info p,.galvanic-experience .comparison-task .model-info p{width:min(260px,70vw);white-space:normal;font-size:11px;line-height:1.7}
/* Steady-state galvanic model: one compact flow toggle replaces the playback strip. */
.galvanic-experience .transport{display:none}.galvanic-experience .metrics>div:first-child{display:none}.galvanic-experience .viewport-tools .compact-flow-button{width:32px;height:32px;padding:7px;border-radius:50%;background:var(--raised);color:var(--cyan);box-shadow:none;flex-shrink:0}.galvanic-experience .viewport-tools .compact-flow-button .icon{width:16px;height:16px}.galvanic-experience .compact-flow-button[aria-pressed=true]{background:var(--cyan);color:#fff}.galvanic-experience #viewport{height:calc(100dvh - 124px)}
@media(max-width:1000px){.galvanic-experience #viewport{height:calc(100dvh - 140px)}}
@media(max-width:700px){.galvanic-experience #viewport{height:56dvh;min-height:360px}.galvanic-experience .metrics{grid-template-columns:repeat(2,minmax(0,1fr));padding:12px 20px}.galvanic-experience .viewport-tools .compact-flow-button{width:30px;height:30px}.galvanic-experience.focus-mode #viewport{height:calc(100dvh - 125px)}}
/* Independent inspector drawer: preserve parameter/task state while widening the scene. */
.workspace{position:relative;--inspector-width:clamp(260px,26vw,350px)}.inspector-toggle{position:absolute;z-index:12;right:var(--inspector-width);top:50%;transform:translate(50%,-50%);width:28px;height:46px;display:grid;place-items:center;padding:5px;border:1px solid var(--line);border-radius:999px;background:var(--surface);color:var(--muted);box-shadow:0 3px 14px #00000012}.inspector-toggle .icon{width:16px;height:16px}.inspector-toggle:hover{color:var(--cyan)}.workspace.inspector-collapsed{grid-template-columns:minmax(0,1fr)}.inspector-collapsed>.inspector-toggle{right:0;transform:translate(0,-50%);border-radius:12px 0 0 12px;border-right:0}.focus-mode .inspector-toggle{display:none}
@media(min-width:1600px){.workspace{--inspector-width:370px}}@media(max-width:1000px){.workspace{--inspector-width:260px}}@media(max-width:700px){.inspector-toggle,.inspector-collapsed>.inspector-toggle{right:0;top:28dvh;transform:none;border-radius:12px 0 0 12px;border-right:0;width:28px;height:44px}}
@media(min-width:701px){.workspace.inspector-collapsed .scene{height:calc(100dvh - 72px);min-height:0}.workspace.inspector-collapsed #viewport{height:0;min-height:0;flex:1 1 0;overflow:hidden}}@media(min-width:701px) and (max-width:1000px){.workspace.inspector-collapsed .scene{height:calc(100dvh - 66px)}}
/* Saved experiment records live beside the inspector tabs. */
.inspector-heading{display:flex;align-items:center;gap:8px;padding-right:16px;border-bottom:1px solid var(--line)}.inspector-heading .inspector-tabs{flex:1;min-width:0;border-bottom:0;padding-right:0}.inspector-heading #toggle-records{position:relative;display:grid;place-items:center;width:36px;height:36px;padding:8px;flex-shrink:0;border-radius:50%;color:var(--muted)}.inspector-heading #toggle-records:hover,.inspector-heading #toggle-records[aria-expanded=true]{background:var(--raised);color:var(--cyan)}.inspector-heading .record-word{display:none}.inspector-heading .count-badge{position:absolute;right:-4px;top:-4px;font-size:9px;padding:1px 4px;min-width:14px;text-align:center;border-radius:999px;color:var(--cyan);background:var(--raised)}
@media(max-width:700px){.inspector-heading{padding-right:18px}.inspector-heading #toggle-records{width:32px;height:32px;padding:6px}}
/* A single scene dock replaces scattered footer labels and an empty data strip. */
.galvanic-experience .scene-footer{position:absolute;z-index:4;left:20px;right:20px;bottom:16px;display:flex;align-items:flex-end;justify-content:space-between;gap:12px;pointer-events:none}.galvanic-experience .scene-footer .metrics{display:flex;flex:0 1 auto;min-height:0;gap:24px;padding:11px 16px;border:1px solid var(--line);border-radius:14px;background:color-mix(in srgb,var(--surface) 92%,transparent);backdrop-filter:blur(10px)}.galvanic-experience .scene-footer .metrics>div{display:flex;flex-direction:column;gap:5px}.galvanic-experience .scene-footer .metrics>div:first-child{display:none}.galvanic-experience .scene-footer .metrics small{font-size:10px;max-width:none}.galvanic-experience .scene-footer .metrics strong{font-size:14px;color:var(--text)}.galvanic-experience .scene-footer .principle-layers{position:static;pointer-events:auto;flex-shrink:0}.galvanic-experience .prediction-hint{display:none;font-size:11px;color:var(--muted)}.galvanic-experience .scene-footer .metrics.prediction-pending>div{display:none}.galvanic-experience .metrics.prediction-pending .prediction-hint{display:block}.galvanic-experience .metrics.prediction-pending:after{content:none}.galvanic-experience .part-info{bottom:95px}.galvanic-experience #viewport{height:calc(100dvh - 72px)}
@media(max-width:1000px){.galvanic-experience #viewport{height:calc(100dvh - 66px)}}
@media(max-width:700px){.galvanic-experience #viewport{height:56dvh;min-height:360px}.galvanic-experience .scene-footer{left:12px;right:12px;bottom:12px;flex-wrap:wrap;gap:8px}.galvanic-experience .scene-footer .metrics{padding:9px 12px;gap:18px}.galvanic-experience .scene-footer .metrics strong{font-size:12px}.galvanic-experience .scene-footer .principle-layers{margin-left:auto}.galvanic-experience .part-info{bottom:125px}.galvanic-experience.focus-mode #viewport{height:calc(100dvh - 62px)}}
.galvanic-experience .scene-footer .metrics.prediction-pending{display:none}.galvanic-experience .inspector-collapsed .scene-footer .metrics.prediction-pending{display:flex}.galvanic-experience .scene-footer .principle-layers{margin-left:auto}
/* Collapse lives in the inspector heading; restore lives in the scene toolbar. */
.workspace .inspector-toggle{position:static;top:auto;right:auto;transform:none;width:28px;height:30px;padding:5px;flex-shrink:0;box-shadow:none;border:0;border-radius:50%;background:transparent;color:var(--muted)}.inspector-heading .inspector-toggle{margin-left:10px}.inspector-heading .inspector-tabs{padding-left:0}.viewport-tools .inspector-toggle{margin-left:2px}.workspace .inspector-toggle:hover{color:var(--cyan);background:var(--raised)}
@media(max-width:700px){.workspace .inspector-toggle{width:28px;height:30px}.inspector-heading .inspector-toggle{margin-left:10px}.inspector-heading .inspector-tabs{padding-left:0;gap:4px}.inspector-heading .inspector-tabs button{padding-left:12px;padding-right:12px}}
/* An independent panel tab sits beside the view toolbar, as a permanent entry point. */
.scene-actions{position:absolute;top:16px;right:20px;z-index:5;display:flex;align-items:center;gap:7px}.scene-actions>.viewport-tools{position:static}.panel-entry{display:flex;align-items:center;gap:5px;padding:9px 11px;height:40px;border:1px solid var(--line);border-radius:999px;background:color-mix(in srgb,var(--surface) 94%,transparent);color:var(--muted);font-size:11px;backdrop-filter:blur(10px);flex-shrink:0}.panel-entry .icon{width:16px;height:16px}.panel-entry[aria-pressed=true]{color:var(--cyan);background:color-mix(in srgb,var(--cyan) 8%,var(--surface))}.panel-entry:hover{background:var(--raised)}.focus-mode .panel-entry{display:none}
@media(max-width:1000px){.scene-actions{top:14px;right:14px}}@media(max-width:700px){.scene-actions{top:14px;right:12px;gap:5px}.panel-entry{height:38px;padding:8px;font-size:10px;gap:4px}.panel-entry .icon{width:15px;height:15px}}
/* Optional practice stays out of the way until the learner opens it. */
.practice-foldout .practice-toggle{flex:1;min-width:0;display:flex;align-items:center;gap:12px;padding:8px 0;background:transparent;text-align:left;border-radius:6px}.practice-toggle b{font-size:12px;font-weight:550}.practice-toggle>span{margin-left:auto;font:11px Consolas,monospace;color:var(--muted)}.practice-toggle>.icon{width:15px;height:15px;color:var(--muted);transition:transform .15s}.practice-open .practice-toggle>.icon{transform:rotate(180deg)}.practice-foldout .practice-toggle:hover:not(:disabled){background:transparent}.practice-toggle:hover b,.practice-toggle:hover>.icon{color:var(--cyan)}.practice-foldout .task-heading{gap:8px}.practice-body{padding-top:7px}.practice-foldout .task-chart{margin-top:15px}.practice-foldout .task-message:empty{display:none}

/* Align the galvanic component picker with the scene toolbar. */
.galvanic-experience .part-chooser{top:16px;min-height:44px;align-items:center}
@media(max-width:1000px){.galvanic-experience .part-chooser{top:14px}}
@media(max-width:480px){.galvanic-experience .part-chooser{top:64px;min-height:0}}

.guided-experience .scene-status{display:none}

.guided-experience .viewport-tools .compact-play-button{width:32px;height:32px;padding:7px;flex-shrink:0;border-radius:50%;background:var(--cyan);color:#fff;box-shadow:none}
.playback-options{position:relative}.playback-options>summary{list-style:none;display:grid;place-items:center;width:30px;height:30px;border-radius:50%;cursor:pointer;color:var(--muted)}
.playback-options .transport{position:absolute;right:0;top:calc(100% + 14px);width:min(360px,calc(100vw - 40px));height:auto;min-height:0;display:flex;flex-wrap:wrap;gap:10px;padding:14px;background:var(--surface);border:1px solid var(--line);border-radius:16px;box-shadow:0 12px 32px #0003;z-index:20}
.playback-options .timeline{order:2;flex:1 0 100%;min-width:0}.playback-options #reset{width:30px;height:30px;padding:6px}.playback-options #record{margin-left:auto}.playback-options select{max-width:80px}.playback-options .tool-divider{display:none}

.guided-experience .viewport-tools button.compact-play-button,.galvanic-experience .viewport-tools button.compact-flow-button{width:28px;height:28px;padding:7px}.guided-experience .viewport-tools button.compact-play-button .icon,.galvanic-experience .viewport-tools button.compact-flow-button .icon{width:14px;height:14px}