:root{color-scheme:dark;--bg:#14191d;--panel:#1c2227;--raised:#232b31;--line:#323c43;--ink:#edf0ec;--muted:#9ca8ae;--orange:#ff8c52;--green:#a0cdaf;--mono:'SFMono-Regular',Consolas,'Liberation Mono',monospace;--font:'Pretendard Variable',Pretendard,-apple-system,BlinkMacSystemFont,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);font-size:14px;-webkit-font-smoothing:antialiased;word-break:keep-all}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer;color:inherit;border:0;background:none}button:disabled{cursor:not-allowed}a{color:inherit;text-decoration:none}button,input,select,a{outline-offset:5px}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid var(--orange)}button{transition:background .18s,color .18s,border-color 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292px;align-items:stretch;border:1px solid var(--line);border-radius:6px;overflow:hidden;min-height:674px;background:var(--panel)}.machine-library{display:flex;flex-direction:column;min-height:0;border-right:1px solid var(--line);background:#191f23}.section-top{padding:21px 20px 19px;display:flex;justify-content:space-between;align-items:center}.section-top h2{font-size:14px;font-weight:650}.count-badge{font:11px var(--mono);color:var(--muted);background:#2a333a;border-radius:3px;padding:3px 5px}.library-search{display:flex;align-items:center;gap:8px;border:1px solid var(--line);border-radius:4px;margin:0 14px 11px;padding:9px 10px}.library-search svg{width:14px;fill:none;stroke:#83939c;stroke-width:1.4}.library-search input{min-width:0;width:100%;background:none;border:0;color:var(--ink);font-size:12px;outline:0}.library-search:focus-within{border-color:var(--orange)}input::placeholder{color:#86939c}.library-filters{display:flex;gap:7px;margin:0 14px 15px}.library-filters 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14px;text-align:center}.detail-link{display:flex;align-items:center;justify-content:space-between;margin:0 20px 22px;padding:13px 0 0;border-top:1px solid #3b464e;font-size:11px;color:#c7d0d4}.detail-link:hover{color:var(--orange)}.flow-note{margin-top:auto;background:#1b2227;padding:17px 20px;border-top:1px solid var(--line)}.flow-note .eyebrow{font-size:9px;color:#8d9da7}.flow-note>div{display:flex;align-items:center;gap:8px;justify-content:space-between;font-size:10px;margin-top:11px;color:#c4cfd5}.flow-note .flow-arrow{color:var(--orange)}.lab-bottom{display:flex;justify-content:space-between;gap:20px;font-size:10px;color:#8b9aa3;padding:17px 0 19px}.lab-bottom>div{display:flex;align-items:center;gap:8px}.lab-bottom b{color:var(--orange);font:11px var(--mono)}.bottom-divider{margin:0 14px;color:#4b565e}.page-footer{display:flex;justify-content:space-between;gap:20px;padding:24px 0 28px;border-top:1px solid var(--line);font:9px var(--mono);letter-spacing:.04em;color:#6f7e86}.page-footer a{font:10px var(--font);color:#a7b5bc}dialog{color:var(--ink);background:#212a30;border:1px solid #5f6e79;border-radius:8px;width:min(560px,calc(100vw - 32px));max-height:calc(100dvh - 48px);padding:25px 30px 30px;box-shadow:0 32px 100px #0009}dialog::backdrop{background:#080e13bb;backdrop-filter:blur(7px)}.dialog-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:22px}dialog h2{font-size:26px;letter-spacing:-.04em;line-height:1.4;margin:8px 0 15px}dialog p{color:#afbec6;line-height:1.8;font-size:14px}dialog .primary-button{margin:25px 0 0;width:100%}.quiz-context{font:10px var(--mono);letter-spacing:.1em;color:var(--orange)}.quiz-options{display:grid;gap:10px;margin:24px 0 18px}.quiz-option{display:flex;gap:12px;text-align:left;border:1px solid #53626b;border-radius:4px;padding:15px;line-height:1.5;font-size:14px;background:#273239}.quiz-option span:first-child{font:12px var(--mono);color:var(--orange);margin-top:3px}.quiz-option:hover:not(:disabled){background:#354550}.quiz-option.wrong{border-color:#c27865;color:#cfad9e;opacity:.65}.quiz-option.correct{border-color:var(--green);background:#244339}.quiz-feedback{min-height:25px;color:#e8b093!important;font-size:13px!important}.success-emblem{width:66px;height:66px;display:grid;place-items:center;color:#14231a;background:var(--green);font-size:30px;border-radius:50%;margin:12px 0 23px}.earned-xp{font:42px var(--mono);font-weight:500;color:var(--orange);margin:20px 0}.earned-xp span{font-size:16px}.completed-explanation{padding:16px 18px;background:#192329;border-left:2px solid var(--orange)}.record-summary{display:flex;gap:22px;margin-bottom:25px}.record-summary span{color:var(--muted);font-size:12px}.record-summary strong{color:var(--orange);font:26px var(--mono);display:block;margin-bottom:4px}.record-list{display:grid;gap:8px}.record-row{display:flex;align-items:center;gap:12px;text-align:left;padding:13px;background:#29343c;border-radius:3px;width:100%}.record-row>span:first-child{font:12px var(--mono);color:var(--orange)}.record-row strong{font-size:13px;font-weight:500;flex:1}.record-row small{font:11px var(--mono);color:var(--green)}.help-steps{list-style:none;padding:0;display:grid;gap:18px;margin:25px 0}.help-steps li{display:flex;gap:14px;align-items:flex-start}.help-steps b{font:12px var(--mono);color:var(--orange);padding-top:5px}.help-steps strong{font-weight:600;display:block;margin-bottom:5px}.help-steps p{font-size:13px}.toast{position:fixed;bottom:30px;left:50%;transform:translateX(-50%);border:1px solid #8caa97;background:#26382e;color:#dbe8df;padding:13px 22px;border-radius:4px;z-index:1000;font-size:13px;box-shadow:0 5px 20px #0005;max-width:90vw}.render-fallback{position:absolute;inset:90px 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@media(min-width:1600px){.lab-shell{padding:0 56px}.lab-workspace{grid-template-columns:270px minmax(480px,1fr) 330px;min-height:714px}.machine-list{height:525px}.machine-item strong{font-size:14px}.machine-meta{font-size:10px}.machine-item{gap:15px}.machine-thumb{width:75px;height:59px}.section-top h2{font-size:16px}.bench-heading{padding-left:32px}.bench-heading h2{font-size:29px}.mission-dossier h3{font-size:24px}.mission-dossier p{font-size:14px}.mission-step strong{font-size:14px}.mission-step small{font-size:12px}.mission-guidance{font-size:12px}.mission-steps{gap:23px}.part-detail strong{font-size:14px}.part-detail p{font-size:13px}.bench-controls{padding:22px 29px;gap:26px}.part-pin{font-size:12px;padding:9px 11px}.mission-panel .section-top,.mission-dossier,.mission-steps,.mission-progress,.flow-note{padding-left:24px;padding-right:24px}.mission-panel .section-top{padding-left:0;padding-right:0;margin:0 24px}.primary-button,.mission-guidance,.detail-link{margin-left:24px;margin-right:24px}.view-scale,.view-hint{font-size:11px}.live-indicator{font-size:10px}.range-control label,.play-button{font-size:12px}.page-footer{font-size:10px}}
@media(max-width:1190px){.lab-shell{padding:0 22px}.masthead{gap:25px}.lab-workspace{grid-template-columns:200px minmax(330px,1fr) 250px}.bench-heading{padding-left:20px}.bench-heading h2{font-size:22px}.bench-controls{gap:12px;padding:16px}.mission-dossier h3{font-size:19px}.mission-dossier,.mission-steps,.mission-progress,.flow-note{padding-left:16px;padding-right:16px}.mission-panel .section-top{margin:0 16px}.primary-button,.mission-guidance,.detail-link{margin-left:16px;margin-right:16px}.machine-thumb{width:48px}.machine-item{gap:6px}.machine-item strong{font-size:11px}.machine-meta{font-size:8px}.machine-meta span:last-child{font-size:9px}.part-pins{gap:4px}.part-pin{font-size:9px;padding:7px 5px}.view-scale{display:none}.wire-button span{display:none}.part-detail{padding:17px}.breadcrumbs>span:first-child{display:none}.breadcrumbs>span:nth-child(2){display:none}.profile{min-width:240px}}
@media(max-width:980px){.lab-shell{padding:0 22px}.lab-workspace{grid-template-columns:200px minmax(0,1fr)}.mission-panel{grid-column:1/-1;display:grid;grid-template-columns:1fr 1fr;border-left:0;border-top:1px solid var(--line);padding:8px 10px 14px;gap:0 15px}.mission-panel .section-top{grid-column:1/-1}.mission-dossier{grid-row:2/5;padding-top:20px}.mission-dossier h3{font-size:24px}.mission-dossier p{font-size:14px}.mission-steps{padding-top:23px;gap:15px}.mission-progress{padding-top:18px}.primary-button{min-height:44px}.mission-guidance{grid-column:2}.detail-link{grid-column:1;grid-row:5;margin-top:20px}.flow-note{grid-column:1/-1;border-top:0;background:none;display:flex;align-items:center;gap:24px}.flow-note>div{justify-content:flex-start;gap:16px;margin:0}.mission-step strong{font-size:14px}.mission-step small{font-size:11px}.viewport{min-height:420px}.machine-list{height:475px}.lab-workspace{min-height:0}.bench-heading h2{font-size:26px}.view-scale{display:inline}.bench-controls{gap:20px;padding:22px}.part-pin{font-size:11px;padding:8px}.part-detail{min-height:95px}.lab-bottom{font-size:10px;line-height:1.6}.lab-bottom>div{display:none}}
@media(max-width:680px){.lab-shell{padding:0 14px}.masthead{height:65px;gap:0}.brand{font-size:15px;gap:9px}.brand svg{width:23px}.breadcrumbs{display:none}.online{display:none}.masthead-actions{gap:18px}.lab-heading{padding:26px 3px 23px;gap:15px;align-items:flex-end}.lab-heading h1{font-size:29px;margin:9px 0 0}.lab-heading p{display:none}.lab-heading .eyebrow{font-size:8px;letter-spacing:.06em}.profile{min-width:0;padding:0;border:0;background:none;gap:8px}.rank-symbol{display:none}.profile-label{font-size:9px}.profile strong{font-size:11px}.profile-progress{width:65px;margin-top:6px}.profile-xp{margin-left:0}.profile-xp b{font-size:17px}.profile-xp>span{font-size:8px}.lab-workspace{display:flex;flex-direction:column;border-radius:5px}.machine-library{border-right:0;border-bottom:1px solid var(--line)}.machine-library .section-top{padding:15px 15px 0}.machine-library .section-top h2{font-size:13px}.library-search{margin:10px 12px 7px;max-width:100%;padding:8px}.library-filters{margin:0 12px 9px}.library-filters select{font-size:11px;width:50%;padding:7px}.machine-list{height:auto;max-height:none;display:flex;overflow-x:auto;overflow-y:hidden;padding:0 12px 10px;gap:6px;scroll-snap-type:x proximity}.machine-item{width:145px;min-width:145px;min-height:67px;margin:0;padding:7px;gap:6px;scroll-snap-align:start}.machine-thumb{width:43px;height:43px}.machine-item strong{font-size:11px;margin-bottom:4px}.machine-meta{font-size:8px;gap:4px}.machine-meta span:last-child{font-size:9px}.machine-item.selected:before{display:none}.library-footer{display:none}.machine-thumb-placeholder{width:43px;height:43px}.bench-heading{height:105px;padding:22px 18px 0}.bench-heading h2{font-size:25px}.bench-heading p{font-size:9px}.bench-heading .eyebrow{font-size:8px}.level-tag{font-size:9px}.viewport{min-height:340px}.view-top{inset:7px 18px auto}.view-tools{right:10px;top:37px;gap:5px}.icon-button{width:31px;height:31px}.view-scale{font-size:8px}.part-pins{bottom:42px;gap:5px}.part-pin{font-size:10px;padding:8px 7px}.axis-key{width:30px;left:13px;bottom:67px}.view-hint{left:17px;font-size:9px;bottom:15px}.bench-controls{padding:18px 16px;gap:14px;flex-wrap:wrap}.play-button{font-size:11px;min-width:73px}.range-control{min-width:70px}.wire-button{margin-left:0}.control-divider{display:none}.range-control label{font-size:10px}.range-control output{font-size:9px}.part-detail{padding:18px 17px;min-height:101px}.part-detail strong{font-size:13px}.part-detail p{font-size:12px}.mission-panel{display:flex;padding:0 3px}.mission-panel .section-top{padding-top:21px}.mission-dossier{padding-top:23px}.mission-dossier h3{font-size:25px;margin:12px 0 9px}.mission-dossier p{font-size:14px}.mission-reward{margin-top:13px}.mission-steps{padding-top:8px;gap:18px}.mission-step strong{font-size:14px}.mission-step small{font-size:12px;margin-top:4px}.step-check{width:23px;height:23px}.mission-progress{padding-top:26px}.mission-progress>div:first-child{font-size:12px}.mission-progress b{font-size:12px}.primary-button{padding:16px;font-size:14px}.mission-guidance{font-size:12px;margin-bottom:15px}.detail-link{font-size:13px;margin-top:4px;padding:16px 0}.flow-note{margin:0 -3px;display:block;background:#1b2227;border-top:1px solid var(--line);padding:20px}.flow-note>div{font-size:12px;justify-content:space-between;margin-top:12px}.flow-note .eyebrow{font-size:10px}.lab-bottom{font-size:9px;justify-content:center;padding:16px 0}.bottom-divider{margin:0 7px}.page-footer{padding:19px 0 22px;font-size:8px;gap:10px}.page-footer>span:nth-child(2){display:none}.page-footer a{font-size:9px}.render-fallback{inset:70px 35px}.render-fallback p{font-size:12px}dialog{padding:20px 21px 25px}dialog h2{font-size:24px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}
/* Keep the full workbench within a typical laptop display. */
@media(min-width:981px){.masthead{height:64px}.lab-heading{padding:23px 0 22px}.lab-heading h1{font-size:32px;margin:8px 0}.lab-workspace{min-height:0;height:clamp(620px,calc(100dvh - 240px),790px)}.machine-list{height:auto;flex:1}.viewport{min-height:280px}.bench-heading{height:100px;flex:none}.bench-controls{min-height:75px;padding-top:18px;padding-bottom:18px;flex:none}.part-detail{min-height:85px;flex:none}.mission-panel .section-top{padding-top:17px;padding-bottom:16px}.mission-dossier{padding-top:18px;padding-bottom:12px}.mission-dossier h3{font-size:21px;line-height:1.45;margin:12px 0 9px}.mission-dossier p{font-size:13px;line-height:1.75}.mission-reward{margin-top:12px}.mission-steps{gap:17px;padding-top:5px}.mission-step strong{font-size:13px}.mission-step small{font-size:10px;margin-top:3px}.mission-progress{padding-top:21px;padding-bottom:17px}.mission-guidance{font-size:10px;margin-bottom:12px}.mission-panel .flow-note{display:none}.detail-link{margin-top:auto;margin-bottom:20px}.lab-bottom{padding:14px 0}.page-footer{padding-top:17px}.part-detail p{font-size:12px;line-height:1.65}}
@media(min-width:981px) and (max-height:800px){.lab-heading{padding:19px 0}.lab-heading p{display:none}.lab-workspace{height:620px}.lab-heading h1{margin-bottom:0}}
input[type=range]{height:17px;margin:-7px 0;background:linear-gradient(#52606a,#52606a) center/100% 3px no-repeat}
@media(max-width:680px){.view-tools .icon-button{width:34px;height:34px}.part-pin{min-height:35px}.wire-button{min-width:26px;min-height:33px}.library-search input{font-size:16px}.library-search{padding-top:7px;padding-bottom:7px}}
@media(max-width:680px){.machine-meta>span:first-child{display:none}.part-pins{max-width:calc(100% - 24px)}.part-pin{white-space:normal;text-align:left}}
/* Original simulators are primary content, never substitutes for the principle previews. */
.bench-heading-actions{display:flex;flex-direction:column;align-items:flex-end;gap:12px;flex:none;margin-left:12px}.original-launch{display:inline-flex;align-items:center;justify-content:center;padding:10px 13px;border:1px solid #ce8450;border-radius:3px;background:#ff8c5217;color:#ffc397;font-size:12px;font-weight:650;white-space:nowrap}.original-launch:hover{background:#ff8c5233;color:#fff}.machine-item.original-machine{display:block;padding:0;border-color:#57646e;background:#242d34}.original-machine-link{display:flex;align-items:center;gap:10px;padding:13px 9px;min-height:80px}.original-machine-link:hover{background:#36414a}.original-v8-mark{width:55px;height:42px;flex:none;display:grid;place-items:center;font:700 25px var(--mono);letter-spacing:-.12em;color:#f6bd96;border:1px solid #a7775380;border-radius:3px;background:#171f26}.original-machine-link strong{font-size:14px;color:#f7e7dc}.original-machine-label{display:block;color:#c1b4a5;font-size:10px;line-height:1.5}.original-principle-button{display:block;width:100%;border-top:1px solid #45515a;padding:7px 9px;color:#a5b3bd;font-size:10px;text-align:right}.original-principle-button:hover{background:#37444c}.original-principle-button[aria-pressed=true]{color:var(--orange)}
@media(max-width:1190px) and (min-width:981px){.bench-heading h2{font-size:21px}.original-launch{padding:9px 8px;font-size:10px}.bench-heading-actions{gap:9px;margin-left:8px}}
@media(max-width:680px){.bench-heading h2{font-size:21px}.bench-heading-actions{gap:9px;margin-left:7px}.original-launch{font-size:10px;padding:9px 7px}.original-v8-mark{width:34px;height:32px;font-size:20px}.original-machine-link{min-height:52px;padding:8px 6px;gap:6px}.original-machine-link strong{font-size:11px;margin-bottom:3px}.original-machine-label{font-size:8px}.original-principle-button{padding:5px 6px;font-size:9px}}