@charset "UTF-8";@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(./inter-cyrillic-ext-wght-normal-BOeWTOD4.woff2) format("woff2-variations");unicode-range:U+0460-052F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(./inter-cyrillic-wght-normal-DqGufNeO.woff2) format("woff2-variations");unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116}@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(./inter-greek-ext-wght-normal-DlzME5K_.woff2) format("woff2-variations");unicode-range:U+1F00-1FFF}@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(./inter-greek-wght-normal-CkhJZR-_.woff2) format("woff2-variations");unicode-range:U+0370-0377,U+037A-037F,U+0384-038A,U+038C,U+038E-03A1,U+03A3-03FF}@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(./inter-vietnamese-wght-normal-CBcvBZtf.woff2) format("woff2-variations");unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(./inter-latin-ext-wght-normal-DO1Apj_S.woff2) format("woff2-variations");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(./inter-latin-wght-normal-Dx4kXJAl.woff2) format("woff2-variations");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}:root{font-family:Inter Variable,Segoe UI,sans-serif;background:#10151d;color:#e6ecf3;--bg:#10151d;--surface:#171f2b;--surface2:#1b2735;--line:#2d3948;--muted:#9aaabd;--text:#e6ecf3;--accent:#efb078;--accent-dark:#d68e51;--blue:#81b7ca;--error:#f29a92;color-scheme:dark;font-synthesis:none}:root[data-theme=light]{background:#f4f5f3;color:#203342;--bg:#f4f5f3;--surface:#fff;--surface2:#e9efef;--line:#cfdadd;--muted:#536a79;--text:#203342;--accent:#a95319;--accent-dark:#8f4010;--blue:#2b7289;--error:#a63632;color-scheme:light}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text)}button,input,select,textarea{font:inherit}button{cursor:pointer;color:inherit}button:disabled{opacity:.45;cursor:default}a{color:inherit}button,a,input,select,textarea,summary{outline-offset:4px}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--accent)}input,textarea,select{max-width:100%;color:var(--text);background:var(--bg);border:1px solid var(--line);border-radius:7px;padding:11px 12px;min-height:43px}input[type=checkbox]{min-height:0;width:17px;height:17px;accent-color:var(--accent)}textarea{resize:vertical;line-height:1.6}p{line-height:1.75;margin:0 0 18px}h1,h2,h3{line-height:1.2;letter-spacing:-.045em;margin:0;font-weight:560}h1{font-size:40px}h2{font-size:28px}h3{font-size:18px}button{border:0}header{height:86px;display:flex;align-items:center;justify-content:space-between;gap:25px;padding:0 max(32px,calc((100vw - 1400px)/2));border-bottom:1px solid var(--line);background:var(--bg)}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;font-size:17px;letter-spacing:.03em;font-weight:600;white-space:nowrap}.brand-icon{display:grid;place-items:center;width:39px;height:39px;background:var(--surface2);border:1px solid var(--accent);border-radius:10px;color:var(--accent);font:28px Georgia}.brand small{display:block;font-size:10px;font-weight:400;letter-spacing:0;color:var(--muted);margin-top:5px}header nav{display:flex;gap:18px}header nav button{background:none;font-size:12px;padding:12px 2px;color:var(--muted);border-bottom:1px solid transparent}header nav button.active,header nav button:hover{color:var(--text);border-color:var(--accent)}.header-actions{display:flex;gap:12px;align-items:center}.language{display:flex;border:1px solid var(--line);border-radius:7px;padding:3px}.language button{background:none;padding:7px 10px;font-size:11px;border-radius:4px;color:var(--muted)}.language button.active{background:var(--surface2);color:var(--accent)}.theme-button,.help-button{border:1px solid var(--line);border-radius:50%;width:31px;height:31px;font-size:16px;background:none;color:var(--muted)}main{max-width:1400px;margin:auto;padding:0 32px}.eyebrow{font-size:10px;text-transform:uppercase;letter-spacing:.14em;font-weight:650;color:var(--accent);margin-bottom:17px}.lead{color:var(--muted);font-size:16px;line-height:1.85}.primary,.secondary,.plain{border-radius:7px;padding:12px 17px;min-height:43px;font-size:12px;line-height:1.5;display:inline-flex;align-items:center;justify-content:center;gap:10px;text-decoration:none}.primary{background:var(--accent);color:var(--bg);border:1px solid var(--accent);font-weight:650}.primary:hover{background:var(--accent-dark)}.secondary{background:var(--surface);color:var(--text);border:1px solid var(--line)}.secondary:hover{border-color:var(--accent);background:var(--surface2)}.plain{background:none;color:var(--muted)}.plain:hover{color:var(--accent)}.icon-button{display:grid;place-items:center;width:32px;height:32px;background:var(--surface2);border:1px solid var(--line);border-radius:5px;color:var(--muted);font-size:17px}.toolbar{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin:20px 0}.hero{display:grid;grid-template-columns:360px minmax(0,1fr);gap:60px;align-items:center;padding:58px 0 65px}.hero h1{font-size:43px;line-height:1.15;max-width:360px;margin-bottom:23px}.hero-copy>.primary{margin-right:12px}.hero-copy>.plain{padding-left:0}.hero-facts{display:flex;gap:28px;border-top:1px solid var(--line);margin-top:28px;padding-top:22px}.hero-facts span{font-size:9px;color:var(--muted)}.hero-facts b{display:block;font-size:18px;font-weight:500;color:var(--text);margin-bottom:7px}.hero-preview{min-width:0;border:1px solid #364958;border-radius:13px;overflow:hidden;box-shadow:0 24px 65px #0003;background:#141e2a;color:#e6ecf3}.stage-header{display:flex;align-items:center;gap:9px;padding:15px 18px;min-height:53px;background:var(--surface2);color:var(--muted);font-size:10px;border-bottom:1px solid var(--line)}.hero-preview .stage-header{background:#1b2735;color:#b1becd;border-color:#364958}.live-dot{width:5px;height:5px;border-radius:50%;background:var(--accent);box-shadow:0 0 12px #efb07866}.live-dot.off{background:#708194;box-shadow:none}.stage-code{margin-left:auto;font-family:ui-monospace,Consolas,monospace;letter-spacing:.12em;color:var(--muted);font-size:10px}.stage-footer{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:14px 18px;font-size:10px;color:var(--muted);border-top:1px solid var(--line)}.hero-preview .stage-footer{background:#17212e;border-color:#364958;color:#b1becd}.hero-scene{height:390px}.section-title{margin-bottom:28px}.section-title p:last-child{font-size:14px;color:var(--muted);margin-top:12px}.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.lab-card{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:24px;text-align:left;transition:transform .2s,border-color .2s}.lab-card:hover{transform:translateY(-4px);border-color:var(--accent)}.card-top{display:flex;align-items:center;gap:15px;color:var(--muted)}.card-top span{font-size:23px;font-family:ui-monospace,monospace;color:var(--accent)}.card-top small{font-size:10px}.card-top b{margin-left:auto;font-size:20px;font-weight:400}.card-illustration{height:130px;display:flex;align-items:center;justify-content:center;position:relative;margin:20px 0 24px;background:var(--surface2);border-radius:8px;color:var(--blue);overflow:hidden;background-image:radial-gradient(#8198ac33 1px,transparent 1px);background-size:17px 17px}.card-illustration span{font:35px ui-monospace,monospace;border:1px solid #7598ac;padding:12px 18px;background:var(--surface2);z-index:1}.card-illustration:before,.card-illustration:after{content:"";width:50%;height:1px;background:var(--blue);position:absolute;left:0}.card-illustration:after{left:auto;right:0}.card-illustration.transistor{color:var(--accent)}.card-illustration.transistor span{border-color:var(--accent)}.lab-card h3{font-size:22px;margin-bottom:14px}.lab-card p{font-size:13px;line-height:1.8;color:var(--muted);min-height:68px}.card-bottom{display:flex;justify-content:space-between;gap:10px;border-top:1px solid var(--line);padding-top:17px;font-size:11px}.card-bottom span{color:var(--muted);font-size:10px}.home-how{display:grid;grid-template-columns:1.4fr repeat(4,1fr);gap:24px;margin:75px 0 40px}.home-how h2{font-size:25px;max-width:240px}.home-how article{border-top:1px solid var(--line);padding-top:16px}.home-how article>span{font:15px ui-monospace,monospace;color:var(--accent)}.home-how h3{font-size:15px;line-height:1.4;margin:13px 0}.home-how p{font-size:11px;color:var(--muted)}.model-note{padding:17px 20px;background:var(--surface2);border:1px solid var(--line);border-radius:8px;color:var(--muted);font-size:11px;line-height:1.7;margin:18px 0}.home>.model-note{margin-bottom:50px}footer{display:flex;justify-content:space-between;align-items:center;gap:20px;max-width:1400px;padding:25px 32px;margin:45px auto 0;border-top:1px solid var(--line);color:var(--muted);font-size:10px}footer>div{display:flex}footer .plain{font-size:10px;padding:8px}.back{display:inline-block;text-decoration:none;font-size:11px;color:var(--muted);margin:22px 0}.lab-title{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:25px}.lab-title .eyebrow{margin-bottom:9px}.lab-title h1{font-size:32px}.lab-title p:last-child{font-size:13px;color:var(--muted);margin:12px 0 0}.tabs{display:grid;grid-template-columns:repeat(4,1fr);gap:7px;border-bottom:1px solid var(--line);padding-bottom:14px}.tabs button{display:flex;align-items:center;gap:12px;text-align:left;background:var(--surface);padding:13px 16px;border-radius:7px;color:var(--muted);font-size:12px;border:1px solid transparent}.tabs small{font:10px ui-monospace,monospace;color:var(--accent)}.tabs [aria-selected=true]{background:var(--surface2);border-color:var(--accent);color:var(--text)}.tabs b{margin-left:auto;font-size:10px;font-weight:500}.tab-content{padding-top:24px}.workbench{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:24px;align-items:start}.experiment-area{min-width:0}.stage{border:1px solid var(--line);border-radius:10px;overflow:hidden;min-width:0;background:var(--surface)}.stage .stage-header .view-switch{margin-left:auto}.view-switch{display:flex;border:1px solid var(--line);border-radius:5px;padding:3px;gap:2px}.view-switch button{border-radius:3px;padding:5px 11px;background:none;color:var(--muted);font-size:10px}.view-switch button.active{background:var(--bg);color:var(--accent)}.visual-host,#scene{height:380px;min-width:0}#scene canvas{display:block;width:100%;height:100%;touch-action:none}.hero-scene#scene{height:390px}#diagram{height:100%;display:flex;align-items:center;justify-content:center;padding:18px;background:var(--surface);color:var(--blue)}.circuit-svg{width:100%;height:100%;max-width:850px}.live-text{fill:var(--accent);font:16px ui-monospace,monospace}.settings{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:22px}.settings h2{font-size:21px;margin-bottom:20px}.settings .eyebrow{font-size:9px;margin-bottom:9px}.field{display:block;margin-bottom:18px}.field>span{display:flex;justify-content:space-between;gap:10px;font-size:12px;margin-bottom:9px}.field>span>small{color:var(--muted);font-size:11px}.field input:not([type=checkbox]),.field select,.field textarea{width:100%;font-size:13px}.field-help{display:block;color:var(--muted);font-size:10px;line-height:1.7;margin-top:7px;margin-bottom:16px}.segmented{display:flex;padding:3px;border:1px solid var(--line);border-radius:7px;background:var(--bg);gap:3px;margin-bottom:18px}.segmented button{flex:1;padding:9px 12px;font-size:11px;background:none;border-radius:5px;color:var(--muted);white-space:nowrap}.segmented button.active{color:var(--accent);background:var(--surface2)}.check{display:flex;align-items:center;gap:9px;font-size:11px;line-height:1.5;margin-top:12px}.readout{display:grid;grid-template-columns:1fr auto;gap:12px;border-top:1px solid var(--line);padding-top:17px;font-size:11px}.readout span{color:var(--muted)}.readout strong{font:12px ui-monospace,monospace;color:var(--accent)}.error-readout{display:grid;gap:7px;font-size:10px;color:var(--blue);margin-top:15px}.error-message{padding:12px;border:1px solid var(--error);color:var(--error);font-size:11px;line-height:1.7;border-radius:7px;margin:18px 0}.progress-note{font-size:11px;color:var(--accent);border-top:1px solid var(--line);padding-top:17px;margin-top:20px}.progress-note small{font-size:10px;color:var(--muted);line-height:2}.meter-row{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:14px}.meter{display:grid;grid-template-columns:1.1fr 1fr .8fr;gap:10px;align-items:center;padding:13px 15px;background:var(--surface);border:1px solid var(--line);border-radius:8px;min-width:0}.meter>div>span{font-size:9px;color:var(--muted)}.meter strong{display:block;font:22px ui-monospace,monospace;color:var(--blue);margin-top:5px;overflow-wrap:anywhere}.meter strong small{font:10px Inter Variable,sans-serif;margin-left:6px;color:var(--muted)}.meter label{min-width:0}.meter label>span{display:block;font-size:9px;color:var(--muted);margin-bottom:6px;line-height:1.5}.meter select{width:100%;min-height:33px;padding:6px;font-size:11px}.micro-copy{font-size:10px;line-height:1.75;color:var(--muted);margin:12px 0}.status-good,.status-error{font-size:11px;color:var(--blue);margin-top:8px}.status-error{color:var(--error)}.run-toolbar{display:flex;flex-wrap:wrap;gap:9px;margin:18px 0}.run-toolbar .primary,.run-toolbar .secondary{padding:11px 14px;font-size:11px}.target-panel{border:1px solid var(--line);border-radius:8px;padding:18px;background:var(--surface)}.target-panel h3{font-size:14px}.target-panel p{font-size:10px;color:var(--muted);margin:8px 0 14px}.target-buttons{display:flex;flex-wrap:wrap;gap:6px}.target-buttons button{border:1px solid var(--line);border-radius:5px;background:var(--surface2);padding:8px 11px;font:10px ui-monospace,monospace;color:var(--blue)}.target-buttons button:hover{border-color:var(--accent);color:var(--accent)}.stage:fullscreen{display:flex;flex-direction:column;height:100svh;width:100vw;border:0;border-radius:0}.stage:fullscreen .visual-host{flex:1;height:auto}.stage:fullscreen #scene{height:100%}.stage:fullscreen .stage-footer{font-size:12px}.results-heading{display:flex;justify-content:space-between;gap:30px;align-items:center;margin-bottom:10px}.results-heading h2{font-size:27px}.results-heading p:not(.eyebrow){font-size:12px;color:var(--muted);margin-top:12px;max-width:700px}.results-heading .toolbar{flex-shrink:0}.chart-controls{display:flex;align-items:center;gap:18px;flex-wrap:wrap;margin-top:20px}.chart-controls .segmented{width:300px}.chart-controls .field{min-width:160px}.chart-card{border:1px solid var(--line);background:var(--surface);border-radius:10px;padding:20px}.plot{width:100%;max-height:400px;color:var(--muted)}.plot text{fill:var(--muted);font:11px ui-monospace,monospace}.plot-grid{stroke:var(--line);stroke-width:1}.plot-curve{stroke:var(--blue);stroke-width:2;opacity:.75}.plot-point{fill:var(--accent);stroke:var(--surface);stroke-width:1.5}.plot-point.actual{fill:#8dbd86}.table-scroll{overflow:auto;border:1px solid var(--line);border-radius:8px;margin:15px 0}table{border-collapse:collapse;width:100%;white-space:nowrap;font-size:11px}th{text-align:left;font-size:10px;font-weight:500;background:var(--surface2);color:var(--muted);padding:13px 14px}td{padding:11px 14px;border-top:1px solid var(--line);font-family:ui-monospace,Consolas,monospace}td small{display:block;font-size:10px;color:var(--muted);margin-top:6px}.pill{display:inline-block;padding:3px 6px;border:1px solid var(--line);border-radius:4px;font:9px Inter Variable,sans-serif;color:var(--blue)}.remove{background:none;color:var(--error);font-size:20px;padding:0 8px}.danger{color:var(--error)}.empty{text-align:center;padding:55px 25px;color:var(--muted);font-size:14px}.empty>span{display:block;font:50px Georgia;color:var(--blue);margin-bottom:15px}.own-data{padding:15px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);font-size:12px;margin:20px 0}.own-data summary{cursor:pointer;color:var(--blue)}#own-data{display:flex;gap:15px;align-items:end;margin-top:20px}#own-data label{font-size:12px}#own-data input{display:block;margin-top:7px;width:190px}.conclusion{display:block;margin-top:25px}.conclusion span{display:block;font-size:17px;margin-bottom:13px}.conclusion textarea{width:100%;font-size:13px}.theory-lead{max-width:850px;margin:15px 0 35px}.theory-lead h2{margin-bottom:20px}.theory-lead p{font-size:15px;color:var(--muted)}.formula{background:var(--surface2);border-left:3px solid var(--accent);padding:25px;margin:25px 0}.formula strong{font:22px ui-monospace,monospace;color:var(--accent)}.formula p{font-size:12px;margin:18px 0 0}.theory-grid{display:grid;grid-template-columns:1fr 1fr;gap:30px}.theory-grid article{border-top:1px solid var(--line);padding-top:22px}.theory-grid h3{font-size:20px;margin-bottom:15px}.theory-grid p{font-size:13px;color:var(--muted)}.quiz{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:25px;margin-top:30px;max-width:800px}.quiz>p{font-size:13px;margin-top:12px}#quiz-feedback{color:var(--blue);margin-bottom:0}.page-heading{padding:40px 0 25px}.page-heading h1{font-size:35px;margin-bottom:18px}.page-heading p:last-child{font-size:13px;color:var(--muted);max-width:800px}.teacher-grid{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(0,1fr);gap:24px;align-items:start;max-width:1120px}.panel{background:var(--surface);border:1px solid var(--line);border-radius:9px;padding:25px;min-width:0}.panel h2,.panel h3{margin-bottom:22px}.two-fields{display:grid;grid-template-columns:1fr 1fr;gap:20px}.created-task{margin-top:25px;border:1px solid var(--accent);border-radius:9px;padding:25px;max-width:1120px}.created-task>p{color:var(--muted);font-size:12px;margin-top:12px}#task-link{width:100%;font-size:10px}.task-page{max-width:950px}.task-card{background:var(--surface);padding:30px;border:1px solid var(--line);border-radius:12px}.task-prompt{font-size:15px;white-space:pre-wrap;margin-top:25px}.task-values{display:flex;flex-wrap:wrap;gap:10px;margin:22px 0}.task-values span{font:12px ui-monospace,monospace;border:1px solid var(--line);border-radius:5px;padding:9px 12px;color:var(--blue)}.task-card>p{font-size:13px;color:var(--muted)}#answer-form{display:flex;align-items:end;gap:12px}#answer-form label{font-size:12px}#answer-form input{display:block;margin-top:8px}.answer-feedback{margin-top:20px;font-size:13px;color:var(--error)}.answer-feedback.good{color:var(--blue)}.solution{margin:20px 0;border-left:2px solid var(--accent);padding:18px;background:var(--surface2)}.solution strong{color:var(--accent);font-size:16px}.solution p{font-size:13px;margin:15px 0 0}.builder-layout{display:grid;grid-template-columns:minmax(0,1fr) 270px;gap:24px}.builder-layout>section{min-width:0}.builder-toolbar{display:flex;align-items:center;gap:8px;padding:10px 0;flex-wrap:wrap}.builder-toolbar .segmented{margin:0}.builder-toolbar .view-switch{margin-left:auto}.builder-stage{border:1px solid var(--line);background:var(--surface);border-radius:9px;overflow:hidden;height:480px;touch-action:none}.builder-stage #scene{height:100%}.builder-svg{width:100%;height:100%;color:var(--blue);touch-action:none;-webkit-user-select:none;user-select:none}.part{cursor:grab;color:var(--blue)}.part:hover .hit-box,.part:focus .hit-box{stroke:var(--accent)}.part .hit-box{fill:var(--surface);stroke:transparent;stroke-width:1}.part text{fill:var(--blue);stroke:none;font:16px ui-monospace,monospace}.part .part-label{font:13px ui-monospace,monospace;fill:var(--text)}.pin{stroke:var(--blue);fill:var(--surface);stroke-width:2;cursor:crosshair}.pin:hover,.pin.pending{fill:var(--accent);stroke:var(--accent)}.pin-label{fill:var(--muted);font-size:11px}.wire{stroke:var(--accent);stroke-width:3;cursor:pointer;pointer-events:stroke}.wire:hover{stroke:var(--error);stroke-width:6}.component-palette{display:grid;grid-template-columns:1fr 1fr;gap:6px;margin-bottom:22px}.component-palette button{padding:9px;font-size:10px;background:var(--surface2);border:1px solid var(--line);border-radius:5px;text-align:left}.component-palette button:hover{border-color:var(--accent)}.builder-aside .panel{padding:20px;margin-bottom:18px}.builder-aside h3{font-size:16px}.webgl-fallback{padding:50px;color:#fff;font-size:18px}dialog{background:var(--surface);color:var(--text);border:1px solid var(--line);border-radius:15px;padding:28px;max-width:540px;width:calc(100vw - 40px);box-shadow:0 30px 150px #0008}dialog::backdrop{background:#080d17b8}.guide-top{display:flex;justify-content:space-between;align-items:center}.guide-top .eyebrow{margin:0}.guide-art{display:grid;place-items:center;height:130px;margin:25px 0;color:var(--accent);background:var(--surface2);border-radius:9px;border:1px solid var(--line)}.guide-art>span{font:42px ui-monospace,monospace}dialog h2{font-size:27px;margin-bottom:18px}dialog p{font-size:14px;color:var(--muted);min-height:90px}.guide-dots{display:flex;gap:7px;margin:25px 0}.guide-dots i{width:7px;height:7px;background:var(--line);border-radius:50%}.guide-dots i.active{background:var(--accent)}dialog .toolbar{justify-content:space-between;margin-bottom:0}#toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%,20px);max-width:calc(100vw - 32px);width:max-content;padding:14px 20px;background:var(--surface2);border:1px solid var(--accent);border-radius:9px;box-shadow:0 8px 35px #0005;color:var(--text);font-size:12px;line-height:1.7;opacity:0;pointer-events:none;transition:opacity .2s,transform .2s;z-index:20}#toast.show{opacity:1;transform:translate(-50%)}@media(min-width:1600px){.hero{gap:85px;grid-template-columns:400px minmax(0,1fr)}.hero h1{font-size:48px;max-width:400px}.hero-scene#scene{height:430px}}@media(max-width:1150px){header{padding-inline:24px;gap:15px}header nav{gap:12px}main{padding-inline:24px}.hero{grid-template-columns:310px minmax(0,1fr);gap:35px}.hero h1{font-size:37px}.hero-scene#scene{height:340px}.home-how{grid-template-columns:repeat(4,1fr);gap:20px}.home-how>div{grid-column:1/-1}.home-how h2{max-width:none}.workbench{grid-template-columns:minmax(0,1fr) 280px;gap:18px}.meter{grid-template-columns:1fr 1fr}.meter>div{grid-column:1/-1;display:flex;align-items:center;justify-content:space-between}.meter strong{margin-top:0}.meter select{min-height:31px}.builder-layout{grid-template-columns:minmax(0,1fr) 245px;gap:18px}.builder-stage{height:420px}.lab-card{padding:20px}.lab-card h3{font-size:20px}.results-heading{display:block}.results-heading .toolbar{margin:15px 0}}@media(max-width:800px){header{height:auto;min-height:70px;flex-wrap:wrap;padding:15px 20px;gap:14px}header nav{order:3;width:100%;justify-content:space-between;border-top:1px solid var(--line);padding-top:8px}header nav button{font-size:11px;padding:7px 0}.brand{font-size:15px}.brand small{font-size:9px}.header-actions{gap:8px;margin-left:auto}main{padding-inline:20px}.hero{grid-template-columns:1fr;padding:25px 0 40px;gap:30px}.hero-preview{order:-1}.hero h1{font-size:38px;max-width:650px}.hero-copy .lead{max-width:600px;font-size:14px}.hero-scene#scene{height:340px}.hero-facts{max-width:500px}.cards{grid-template-columns:1fr 1fr;gap:15px}.cards>.lab-card:last-child{grid-column:1/-1}.cards>.lab-card:last-child .card-illustration{height:80px}.lab-card p{min-height:0}.home-how{grid-template-columns:1fr 1fr;gap:24px;margin-top:45px}.workbench{grid-template-columns:1fr}.settings{margin-top:5px;padding:24px;display:block}.settings .field{display:inline-block;width:calc(50% - 10px);vertical-align:top;margin-right:14px}.settings .field:nth-of-type(2n){margin-right:0}.settings .segmented{max-width:380px}.settings .readout{max-width:500px}.settings .check{margin-top:10px}.visual-host,#scene{height:380px}.lab-title h1{font-size:27px}.lab-title{align-items:flex-start}.lab-title>.secondary{font-size:10px;padding:8px;min-height:36px;flex-shrink:0}.tabs button{font-size:10px;padding:12px 10px;gap:7px}.results-heading h2{font-size:24px}.theory-grid{gap:20px}.teacher-grid{grid-template-columns:1fr}.page-heading h1{font-size:29px}.builder-layout{grid-template-columns:1fr}.builder-stage{height:440px}.builder-aside{display:grid;grid-template-columns:1fr 1fr;gap:15px}.component-palette{grid-template-columns:1fr 1fr}.builder-toolbar .segmented{max-width:100%}footer{padding:20px;flex-wrap:wrap;gap:10px;font-size:9px}.formula strong{font-size:18px}.task-card{padding:25px}}@media(max-width:480px){header{padding:12px 16px}.brand{font-size:14px;gap:8px}.brand small{display:none}.brand-icon{width:31px;height:31px;font-size:24px}.theme-button,.help-button{width:28px;height:28px}.header-actions{gap:7px}.language button{font-size:10px;padding:6px 8px}main{padding-inline:16px}.hero{padding-top:20px;gap:24px}.hero h1{font-size:32px;line-height:1.2;max-width:350px}.hero-scene#scene{height:275px}.stage-header{padding:12px;font-size:9px}.stage-footer{font-size:9px;padding:12px}.hero .eyebrow{font-size:9px}.hero-facts{gap:20px}.cards{grid-template-columns:1fr}.cards>.lab-card:last-child{grid-column:auto}.cards>.lab-card:last-child .card-illustration{height:120px}.card-illustration{height:120px}.lab-card h3{font-size:23px}.lab-card p{font-size:13px}.home-how p{font-size:11px}.home-how{gap:18px}.section-title h2{font-size:25px}.lab-title h1{font-size:24px}.lab-title .eyebrow{font-size:9px}.lab-title p:last-child{font-size:12px}.lab-title>.secondary{max-width:80px}.tabs{gap:5px}.tabs button{display:block;padding:11px 7px;font-size:9px;line-height:1.6}.tabs small{display:block;font-size:9px;margin-bottom:4px}.tabs b{float:right}.visual-host,#scene{height:300px}.stage .stage-header{gap:6px}.stage .icon-button{width:28px;height:28px;font-size:14px}.view-switch button{padding:4px 7px;font-size:9px}.meter-row{gap:8px}.meter{padding:12px;gap:8px}.meter strong{font-size:18px}.meter>div{display:block}.meter strong{margin-top:6px}.meter label>span{font-size:8px}.meter select{font-size:10px}.run-toolbar .primary,.run-toolbar .secondary{font-size:10px;padding:10px}.run-toolbar>button:last-child{width:100%}.settings .field{display:block;width:100%;margin-right:0}.settings{padding:22px}.target-buttons button{padding:8px 9px}.chart-card{padding:5px}.chart-controls .field{min-width:0;flex:1}.chart-controls .segmented{width:100%}.theory-grid{grid-template-columns:1fr;gap:18px}.theory-lead p{font-size:13px}.formula{padding:20px}.formula strong{font-size:14px;overflow-wrap:anywhere}.theory-lead h2{font-size:25px}.theory-grid h3{font-size:19px}#own-data{flex-wrap:wrap;gap:12px}#own-data label{flex:1;min-width:0}#own-data input{width:100%}.panel{padding:20px}.task-values span{font-size:11px}.task-card h2{font-size:23px}.task-card{padding:22px}.task-prompt{font-size:13px}.task-values{gap:7px}#answer-form{flex-wrap:wrap}#answer-form label,#answer-form input{width:100%}.builder-toolbar .segmented{width:100%;margin-bottom:4px}.builder-stage{height:330px}.builder-aside{grid-template-columns:1fr}.builder-stage .builder-svg{min-width:0}.page-heading h1{font-size:27px}.page-heading{padding-top:25px}.builder-layout>.section{min-width:0}.builder-layout .toolbar{gap:7px}.builder-layout .toolbar>button{font-size:10px;padding:10px}.two-fields{gap:12px}.guide-art{height:100px}dialog{padding:23px}dialog h2{font-size:23px}dialog p{font-size:13px;min-height:120px}.results-heading .toolbar>button{font-size:11px}footer>div{flex-wrap:wrap}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}.project-credit{display:block;font-size:10px;line-height:2;margin-top:5px;color:var(--text)}.plot-point.NPN-BE{fill:#81b7ca}.plot-point.NPN-BC{fill:#efb078}.plot-point.PNP-BE{fill:#b3a0da}.plot-point.PNP-BC{fill:#8bbd8e}.curve-legend{display:flex;flex-wrap:wrap;gap:15px;font:11px ui-monospace,monospace;margin:15px 0}.curve-legend span:before{content:"●";margin-right:8px}.npn-be{color:#81b7ca}.npn-bc{color:#efb078}.pnp-be{color:#b3a0da}.pnp-bc{color:#8bbd8e}.part .hit-box{fill:transparent}.part.selected .hit-box{stroke:var(--accent)}.wire.selected{stroke:var(--error);stroke-width:4}.wire-list{max-height:200px;overflow:auto;font:9px ui-monospace,monospace}.wire-list>div{display:flex;align-items:center;justify-content:space-between;gap:7px;padding:5px 0;border-top:1px solid var(--line)}.wire-list>div.active{color:var(--accent)}.wire-list .remove{padding:4px 8px}.wire-list .remove:hover{background:var(--surface2)}dialog{max-height:calc(100svh - 30px);overflow:auto}@media(max-width:480px){.plot text{font-size:18px}.component-palette button,.target-buttons button{min-height:38px}.wire-list{font-size:11px}}.row-value{font:11px ui-monospace,monospace;width:108px;min-height:31px;padding:6px 8px}.row-value[data-row-key=im]{width:130px}