@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;450;500;550;600;650;700&family=Space+Grotesk:wght@400;500;600;700&display=swap');
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@media(max-width:1000px){.welcome-intro h1{font-size:38px}.lesson-grid,.lesson-bottom{grid-template-columns:1fr}.lesson-intro{padding:22px}.lesson-book{display:none}.exam-task-body{gap:18px}.lobby-fields{grid-template-columns:1fr 1.2fr}.lobby-fields label:last-child{grid-column:1/-1}.exam-session-bar{flex-wrap:wrap}.exam-session-bar>div:first-child{flex-basis:60%}.learning-tabs>span{display:none}}
@media(max-width:650px){.mode-home{padding:0 21px}.welcome-header{height:80px}.welcome-brand{font-size:24px}.welcome-status{font-size:8px;max-width:120px;line-height:1.7;text-align:right}.welcome-intro{margin:36px 0 26px}.welcome-intro h1{font-size:32px;letter-spacing:-1.2px}.welcome-intro .eyebrow{font-size:8px}.welcome-intro p{font-size:11px}.entry-options{grid-template-columns:1fr;gap:15px}.entry-card{padding:24px;min-height:300px}.entry-symbol{margin-bottom:19px}.entry-card>strong{font-size:24px}.welcome-modules{margin-top:27px}.welcome-modules p{font-size:10px}.welcome-modules b{padding:0 5px}.lobby-title h2{font-size:26px}.lobby-fields{grid-template-columns:1fr;gap:18px}#exam-setup{padding:21px}.exam-rules{padding:16px;font-size:10px}.learning-tabs{margin-top:7px}.learning-tabs button{font-size:10px;padding:12px 14px}.lesson-intro{padding:21px}.lesson-intro h2{font-size:22px}.lesson-intro p{font-size:11px}.theory-card,.worked-example,.knowledge-check{padding:21px}.lesson-formula{font-size:18px;padding:15px}.lesson-cta{align-items:flex-start;flex-direction:column;padding:20px}.lesson-cta .btn{width:100%}.exam-task-body{grid-template-columns:1fr;padding:18px}.exam-session-bar{padding:16px;gap:12px}.exam-session-bar strong{font-size:15px}.exam-session-bar>div:first-child{flex-basis:70%}.exam-session-bar .btn{width:100%}.exam-clock{min-width:65px}.exam-clock b{font-size:24px}.exam-task-body ol{font-size:11px}.exam-complete{padding:18px;flex-wrap:wrap;gap:12px}.exam-complete .btn{width:100%}.home-resume{align-items:flex-start;flex-direction:column}.history-item{padding:14px}.breadcrumb #crumb{max-width:190px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.breadcrumb{display:flex;align-items:center}.home-nav{margin-right:4px;font-size:18px}}
.exam-scene-timer{position:absolute;top:14px;right:15px;display:flex;align-items:center;gap:8px;background:#f8faedeb;border:1px solid #b8c9a2;border-radius:5px;padding:6px 8px;z-index:3}.exam-scene-timer b{font:500 14px var(--display);color:#607c43;font-variant-numeric:tabular-nums}.exam-scene-timer button{font-size:9px;border-left:1px solid #d5dfc5;padding-left:8px;color:#6e8555}.exam-board-neutral{color:#738466!important}body[data-experience="exam"] .board-label{display:none}
@media(min-width:541px) and (max-width:650px){.entry-options{grid-template-columns:1fr 1fr}.entry-card{min-height:345px;padding:21px}.entry-card>strong{font-size:22px}.entry-description{font-size:11px}.entry-chips{margin:15px 0;gap:4px}.entry-chips i{font-size:8px}.welcome-intro h1{font-size:31px}}
@media(max-width:540px){.entry-card{min-height:0;padding:20px;display:grid;grid-template-columns:36px 1fr;column-gap:13px;row-gap:7px}.entry-symbol{grid-column:1;grid-row:1/4;width:36px;height:36px;font-size:23px;margin:0}.entry-tag{grid-column:2;margin:0;font-size:7px}.entry-card>strong{grid-column:2;font-size:22px}.entry-description{grid-column:2;font-size:10px;margin:0;line-height:1.8}.entry-chips{display:none}.entry-link{grid-column:2;font-size:10px;padding-top:9px;margin-top:3px}.welcome-intro{margin-top:29px}.welcome-intro h1{font-size:29px}}
/* Workbench: direct instrument controls and a single, persistent measurement action. */
.bench-card{border-color:#d4dfd4;border-radius:14px;box-shadow:0 3px 14px #23442f05}.bench-toolbar{height:60px;min-height:60px;padding:0 19px;background:#fff}.bench-tab{font-size:13px;gap:10px}.cube-icon{display:flex}.cube-icon svg{width:23px;height:23px}.view-actions{align-items:center;gap:3px}.view-actions .icon-btn{width:34px;height:34px}.icon-btn svg,.dock-icon svg{width:19px;height:19px}.breadboard-toolbar{padding:11px 17px;gap:12px;background:#f8faf6}.board-tools{border-radius:7px;padding:3px;border-color:#dfe7dc;background:#fff}.board-tools button{font-size:11px;padding:8px 13px;border-radius:5px}.board-tools button.active{background:#1d735a;color:#fff;box-shadow:0 2px 4px #235e2e0d}.breadboard-toolbar>label{font-size:10px;cursor:pointer}.breadboard-toolbar #focus-board{font-size:11px}.stage-more{position:relative}.stage-more-menu{position:absolute;right:0;top:40px;z-index:30;min-width:220px;background:#fff;border:1px solid #dce5d7;border-radius:9px;padding:6px;box-shadow:0 10px 35px #22452f20}.stage-more-menu button{display:block;padding:12px 13px;width:100%;text-align:left;font-size:12px;border-radius:5px}.stage-more-menu button:hover{background:#edf5e9}.stage-next{display:flex;align-items:center;gap:12px;background:#edf4e9;border-bottom:1px solid #dce7d5;padding:13px 17px;flex-shrink:0}.stage-next-symbol{width:29px;height:29px;flex-shrink:0;display:grid;place-items:center;border-radius:50%;background:#d8e9cf;color:#5e854d;font:18px var(--display)}.stage-next>div:nth-child(2){flex:1;min-width:0}.stage-next strong{font-size:12px;font-weight:600;color:#3f663d}.stage-next p{font-size:10px;line-height:1.65;color:#7f9473;margin-top:3px}.stage-next button{border:1px solid #bfd1b5;background:#f9fcf4;font-size:10px;font-weight:600;color:#477341;border-radius:5px;padding:9px 11px;flex-shrink:0}.stage-next button:hover{background:#fff}#viewport{min-height:460px;background:#e8ede5}.scene-overlay{top:15px;left:17px;right:17px}.live-pill{font-size:9px;border-radius:5px;padding:7px 10px;background:#f9fff3e8}.scene-help{font-size:10px;bottom:12px;max-width:calc(100% - 30px);border:1px solid #dae3cf;background:#f8fbf1eb;padding:6px 10px}.scene-caption{bottom:47px}.scene-caption>span{font-size:10px}.instrument-anchor{position:absolute;z-index:4;transform:translate(-50%,-50%);display:flex;align-items:center;gap:7px;padding:9px 13px;min-height:40px;white-space:nowrap;border:1px solid #adc6a4;border-radius:7px;background:#fbfff5f2;color:#48783f;font-size:11px;font-weight:600;box-shadow:0 3px 9px #28452f13;transition:background .16s,box-shadow .16s}.instrument-anchor svg{width:16px;height:16px}.instrument-anchor:hover{background:#fff;box-shadow:0 5px 15px #26472725}.instrument-anchor.on{background:#1e765a;color:#f2ffdf;border-color:#1e765a}.meter-anchor{color:#6f7549;border-color:#c8cbae;background:#fffdf0ed}.instrument-card{position:absolute;right:16px;top:55px;width:280px;max-width:calc(100% - 32px);padding:19px;background:#fffef8fa;border:1px solid #becdb3;border-radius:12px;box-shadow:0 12px 40px #1f422332;z-index:12}.instrument-card-header{display:flex;align-items:flex-start;justify-content:space-between;gap:10px;margin-bottom:15px}.instrument-card-header span{font-size:8px;letter-spacing:1px;color:#8c9f7d}.instrument-card-header h3{font:500 17px var(--display);letter-spacing:-.3px;margin-top:5px}.instrument-card-header .icon-btn{font-size:23px;width:22px;height:25px}.instrument-value-label{display:block;font-size:11px;color:#748c64;margin:13px 0 8px}.quick-value{display:flex;align-items:center;border:1px solid #d4e1c9;border-radius:7px;background:#f8fcf0;overflow:hidden}.quick-value>button{width:37px;height:45px;font-size:20px;color:#699052;flex-shrink:0}.quick-value>button:hover{background:#edf5e1}.quick-value input{width:80px;min-width:0;flex:1;border:0;background:none;text-align:center;padding:10px 0;font:500 22px var(--display);color:#456b38;outline:none}.quick-value input::-webkit-inner-spin-button{display:none}.quick-value>span{font-size:12px;color:#92a67c;margin-right:8px}.instrument-card p{font-size:11px;line-height:1.8;color:#8a9b7b;margin-top:10px}.quick-power{margin-top:15px;display:flex;width:100%;align-items:center;justify-content:center;gap:9px;font-size:12px;font-weight:600;border:1px solid #d3dfca;border-radius:6px;padding:12px;background:#f0f6e5;color:#5d7d46}.quick-power svg{width:17px;height:17px}.quick-power.is-on{background:#e7f0df;color:#4c7740}.quick-meter-modes{display:flex;gap:6px}.quick-meter-modes button{flex:1;padding:11px 5px;border:1px solid #dbe4d1;border-radius:6px;background:#f8faf3;color:#839572}.quick-meter-modes b{display:block;font:500 20px var(--display);margin-bottom:5px}.quick-meter-modes span{font-size:9px}.quick-meter-modes button.active{border-color:#6e9c5c;background:#e8f2dc;color:#456b35}.quick-meter-reading{background:#1c3d32;color:#e0efb6;border-radius:7px;padding:16px;margin-top:14px;text-align:right;font:26px var(--display);font-variant-numeric:tabular-nums}.quick-meter-reading span{font-size:12px;margin-left:9px;color:#9fc987}.quick-probes{display:flex;gap:7px;margin-top:11px}.quick-probes button{display:flex;align-items:center;gap:5px;font-size:10px;border:1px solid #dfe7d7;border-radius:5px;padding:10px 8px;background:#fafcf6;flex:1}.quick-probes button.active{border-color:#86ad71;background:#e9f3df}.quick-probes b{margin-left:auto;font-family:var(--display);color:#5e8051}#quick-branch{width:100%;padding:10px;font-size:11px}.measurement-dock{display:flex;align-items:center;gap:13px;padding:13px 17px;background:#fff;border-top:1px solid #dce6d6;z-index:8;flex-shrink:0}.dock-history{display:flex;gap:3px;padding-right:11px;border-right:1px solid #e4eadf}.dock-icon{height:32px;width:29px;display:grid;place-items:center;color:#67875b;border-radius:5px}.dock-icon:hover{background:#eef5e7}.dock-icon:disabled{opacity:.28}.dock-reading{margin-right:auto;min-width:100px}.dock-reading>span{font-size:9px;color:#90a17d}.dock-reading>div{display:flex;gap:7px;align-items:baseline;margin-top:3px}.dock-reading strong{font:500 24px var(--display);line-height:1.2;letter-spacing:-.6px;color:#2f5f40;font-variant-numeric:tabular-nums}.dock-reading small{font:12px var(--display);color:#8ca471}.dock-status{font-size:9px;color:#9aa88a;white-space:nowrap}.dock-status:before{content:'';display:inline-block;height:5px;width:5px;border-radius:50%;background:#b4bca9;margin-right:5px}.dock-status.on:before{background:#599659}.dock-extra{border:1px solid #dce5d4;border-radius:5px;padding:8px;font-size:9px;color:#738c5c;max-width:135px;background:#f8fbf1}#dock-record{gap:7px;min-height:41px;padding:10px 13px;white-space:nowrap;font-size:11px;border-radius:6px}#dock-record svg{width:16px;height:16px}#dock-record kbd{font-size:9px;font-family:var(--font);border:1px solid #ffffff35;padding:2px 4px;border-radius:3px;color:#c1dcad;margin-left:5px}.instruments{border-radius:12px;border-color:#dce5d6;padding:20px;align-self:start;position:sticky;top:18px}.panel-heading h2{font-family:var(--display);font-size:16px;font-weight:500}.inspector-tabs{display:flex;border-bottom:1px solid #e1e8d9;margin:18px 0 20px}.inspector-tabs button{flex:1;padding:10px 4px;border-bottom:2px solid transparent;font-size:11px;color:#9baa8b}.inspector-tabs button.active{border-color:#66925a;color:#4e7c40;font-weight:600}.instruments .meter-heading{border:0;padding:0;margin:0 0 13px}.instruments .meter-heading h2{font-size:12px}.mode-switch button{font-size:11px;padding:6px 8px}.meter-display{padding:16px}.meter-display-top{font-size:9px}.meter-value>span{font-size:35px}.meter-subtext{font-size:8px;line-height:1.6}.probe-controls{margin:15px 0 16px;gap:9px}.probe-controls label{font-size:10px;gap:7px}.probe-controls select{font-size:10px;padding:9px 7px}.probe-pick{font-size:9px;padding:7px 6px}.record-note{font-size:9px;line-height:1.7}.inspector-hint{display:flex;gap:9px;align-items:flex-start;border-top:1px solid #edf1e6;margin-top:19px;padding-top:15px;color:#93a580}.inspector-hint>span{font:20px var(--display)}.inspector-hint p{font-size:10px;line-height:1.8}.power-row{padding:0 0 17px}.power-row strong{font-size:12px}.power-row small{font-size:10px}.switch{width:37px;height:22px;padding:4px}.switch span{height:14px;width:14px}.switch.on span{transform:translateX(15px)}.parameters{gap:11px;padding:15px 0 5px}.parameter label{font-size:11px}.input-unit{width:112px}.input-unit input{font-size:13px;padding:9px 3px 9px 8px;flex:1;min-width:0}.input-unit span{font-size:11px}.extra-row{font-size:11px;padding:11px}.extra-hint{font-size:9px;line-height:1.7}.scene-value-control{margin-top:11px;display:flex;align-items:center;justify-content:space-between;gap:10px;font-size:10px;color:#7b906a}.scene-value-control>div{display:flex;border:1px solid #d6e1c9;background:#fff;border-radius:4px;align-items:center;padding:4px 6px;width:110px;gap:4px}.scene-value-control input{width:80px;min-width:0;border:0;font:12px var(--display);background:none;color:#526e3e;outline:none}.scene-selection{top:55px;border-radius:10px;padding:14px;width:235px}.scene-part-actions{margin-top:11px}.scene-part-actions button{font-size:10px;padding:8px 9px}.board-state-row strong{font-size:12px}.breadboard-panel{padding:18px 19px}.board-actions .btn{font-size:10px;padding:9px 11px}.board-tip{font-size:10px;line-height:1.9}.direct-assembly-tip{font-size:11px}.advanced-wiring,.board-issues{font-size:11px}.journey-item{font-size:11px}.journey-item.done{color:#6d9759}.journey-item.done b{background:#e1edd7;border-color:#d2e1c4;color:#628846}.interaction-guide{display:grid;gap:14px;margin:20px 0}.interaction-guide>div{border:1px solid #e0e8d5;padding:18px 18px 18px 52px;border-radius:8px;position:relative}.interaction-guide>div>b{position:absolute;left:17px;top:20px;width:23px;height:23px;display:grid;place-items:center;border-radius:50%;background:#e5efda;color:#6c8f55;font-size:11px}.interaction-guide h3{margin:0 0 6px}.interaction-guide p{font-size:12px}.shortcut-help{font-size:10px!important;color:#8d9e7b!important;line-height:2!important}.full-bench .breadboard-panel{display:none}.full-bench .stage-next{padding:10px 17px}.full-bench .stage-next p{display:none}.full-bench #viewport{min-height:200px}.full-bench .measurement-dock{border-radius:0 0 13px 13px}
@media(max-width:1250px){.dock-status{display:none}.measurement-dock{gap:9px;padding:12px}.dock-extra{font-size:9px;padding:8px 6px;max-width:125px}.instruments{padding:18px 15px}.dock-history{padding-right:7px}.dock-reading strong{font-size:22px}}
@media(max-width:1050px){.lab-grid{grid-template-columns:1fr}.instruments{position:static}.instruments .inspector-tabs{max-width:400px}.instruments #inspector-meter{max-width:500px}.instruments #inspector-settings{max-width:650px}.instruments .parameters{grid-template-columns:1fr 1fr;gap:13px 25px}.instruments .parameter{flex-direction:row;align-items:center}.inspector-hint{max-width:500px}#viewport{height:530px;min-height:500px}.measurement-dock{padding:13px 17px}.dock-status{display:block}.dock-extra{max-width:160px}.full-bench #viewport{height:auto;min-height:200px}}
@media(max-width:650px){.bench-toolbar{padding:0 13px;min-height:55px;height:55px}.bench-tab{font-size:12px;gap:7px}.bench-tab .badge{display:none}.view-actions{gap:0}.view-actions .icon-btn{width:30px;height:32px}.view-actions .icon-btn svg{width:17px;height:17px}.cube-icon svg{width:20px;height:20px}.breadboard-toolbar{padding:10px 12px;gap:9px}.board-tools button{font-size:10px;padding:8px 11px}.stage-next{padding:12px;gap:9px;align-items:flex-start}.stage-next-symbol{width:24px;height:24px;font-size:15px}.stage-next strong{font-size:11px;line-height:1.6}.stage-next p{font-size:10px}.stage-next button{font-size:9px;padding:8px;max-width:110px}.stage-next>div:nth-child(2){flex:1}#viewport{height:430px;min-height:410px}.instrument-anchor{font-size:10px;min-height:38px;padding:8px 10px}.instrument-card{width:265px;padding:17px;top:52px;right:12px;max-width:calc(100% - 24px)}.measurement-dock{gap:9px;padding:12px;flex-wrap:wrap}.dock-history{padding-right:5px}.dock-icon{width:26px;height:30px}.dock-reading{min-width:85px}.dock-reading strong{font-size:23px}.dock-status{display:none}#dock-record{margin-left:auto;font-size:10px;min-height:40px;padding:10px}#dock-record kbd{display:none}.dock-extra{order:5;max-width:none;flex:1;font-size:10px;padding:9px}.dock-reading>span{font-size:8px}.scene-help{font-size:9px;bottom:10px;max-width:calc(100% - 22px)}.scene-caption{display:none!important}.scene-selection{width:220px;right:12px;top:52px}.instruments{padding:20px}.instruments .parameters{grid-template-columns:1fr 1fr;gap:12px}.instruments .parameter{flex-direction:column;align-items:flex-start}.instruments .input-unit{width:100%}.instruments .input-unit input{width:75%;min-width:0}.instruments #inspector-meter{max-width:none}.inspector-tabs button{font-size:12px}.meter-value>span{font-size:41px}.probe-controls label{font-size:11px}.probe-controls select{font-size:11px;padding:11px 8px}.probe-pick{font-size:10px;padding:9px}.instruments .btn.primary{min-height:44px}.full-bench .breadboard-toolbar>label{display:none}.full-bench .stage-next{padding:8px 12px}.full-bench .stage-next-symbol{display:none}.full-bench #viewport{min-height:160px}.full-bench .measurement-dock{padding:9px 12px}.full-bench .measurement-dock .dock-extra{padding:7px;font-size:9px}.full-bench .breadboard-toolbar{padding:7px 12px}.full-bench .bench-toolbar{height:48px;min-height:48px}.full-bench .dock-reading strong{font-size:21px}.full-bench #dock-record{min-height:36px;padding:8px 10px}.stage-more-menu{min-width:210px}.stage-more-menu button{padding:13px;font-size:11px}}