/* Fonts: the platform's static/css/fonts.css (Alexandria, IBM Plex Sans Arabic), loaded by the page shell. */
*{box-sizing:border-box}body{margin:0;background:var(--color-bg);color:var(--color-on-surface);font:14px Alexandria,'IBM Plex Sans Arabic',Arial,sans-serif}button,input,select{font:inherit}button{cursor:pointer;color:inherit;background:transparent;border:1px solid transparent;border-radius:var(--r-sm);display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:36px;padding:6px 11px;transition:background .15s,border-color .15s}button:hover{background:var(--color-surface-3)}button:disabled{opacity:.4;cursor:not-allowed}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible,canvas:focus-visible{outline:2px solid var(--color-link);outline-offset:3px}input,select{min-width:0;max-width:100%;border:1px solid var(--color-border);border-radius:8px;background:var(--color-surface-sunken);color:var(--color-on-surface);padding:7px 9px;min-height:36px}input[type=number]{direction:ltr;text-align:left;font-variant-numeric:tabular-nums}input[type=checkbox]{accent-color:var(--color-primary);width:15px;height:15px;min-height:0;margin:0}input[type=color]{width:100%;padding:3px}select{cursor:pointer}svg{width:19px;height:19px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}h1,h2,h3,p{margin:0}h1,h2,h3{font-family:Alexandria,'IBM Plex Sans Arabic',Arial,sans-serif;font-weight:600}h2{font-size:14px}h3{font-size:14px}a{color:var(--color-link)}.svg-defs{position:absolute;width:0;height:0;overflow:hidden}.header{height:78px;padding:0 32px;display:flex;align-items:center;gap:25px;border-bottom:1px solid var(--color-border);background:var(--color-surface)}.brand{display:flex;align-items:center;gap:10px;direction:ltr;text-decoration:none;color:var(--color-on-surface)}.brand strong{font-family:Alexandria,sans-serif;font-size:17px;letter-spacing:-.7px;display:block;color:var(--dm-logo-machine)}.brand b{color:var(--color-primary)}.brand small{display:block;font-size:12.5px;letter-spacing:1px;text-align:right;color:var(--color-on-surface-muted)}.header-divider{height:28px;width:1px;background:var(--color-border)}.header-label{font-size:13px;color:var(--color-on-surface-muted)}.header-label span{margin:0 12px;opacity:.5}.header-actions{display:flex;gap:7px;margin-inline-start:auto}.outline-btn{border-color:var(--color-border);background:var(--color-surface-sunken)}.text-btn{font-size:13px;color:var(--color-on-surface-muted)}.icon-btn{padding:7px;min-width:36px}.primary-btn{background:var(--color-primary-strong);color:#fff;font-weight:600;padding:8px 20px}.dark .primary-btn{color:#102638}.primary-btn:hover{background:var(--dm-cyan-hover);color:white}main{max-width:1820px;margin:0 auto;padding:27px 30px 0}.intro{display:flex;justify-content:space-between;align-items:center;margin-bottom:25px}.eyebrow{color:var(--color-link);font-size:12.5px;margin-bottom:10px}.eyebrow.small{font-size:12px;margin-bottom:6px}h1{font-size:29px;line-height:1.6;letter-spacing:-.9px}.title-dot{color:var(--color-primary)}.intro p{font-size:14px;color:var(--color-on-surface-muted);margin-top:7px}.intro-badge{color:var(--color-on-surface-muted);font-size:13px}.intro-badge small{display:block;padding-inline-start:16px;color:var(--color-on-surface-muted);opacity:.7;margin-top:8px;font-size:12.5px}.status-dot{display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--color-tertiary);margin-inline-end:7px}.workspace{display:grid;grid-template-columns:214px minmax(350px,1fr) 280px;gap:16px;align-items:stretch}.panel{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--r-lg);overflow:hidden}.panel-heading{display:flex;align-items:center;justify-content:space-between;padding:20px 18px 12px}.count{font-size:12.5px;color:var(--color-on-surface-muted);font-variant-numeric:tabular-nums;border:1px solid var(--color-border);border-radius:6px;padding:1px 6px}.panel-hint{font-size:12.5px;color:var(--color-on-surface-muted);padding:0 18px 15px}.experiments{display:flex;flex-direction:column}.preset{width:calc(100% - 20px);margin:3px 10px;padding:13px 10px;gap:11px;justify-content:flex-start;text-align:start;min-height:65px}.preset.active{background:var(--color-primary-soft);border-color:var(--color-primary);box-shadow:inset -3px 0 var(--color-primary)}.preset .preset-art{width:33px;height:33px;color:var(--color-on-surface-muted);flex:none}.preset.active .preset-art{color:var(--color-link)}.preset-art svg{width:32px;height:32px;stroke-width:1.2}.preset strong{font-weight:600;font-size:13px;display:block}.preset small{display:block;font-size:12px;color:var(--color-on-surface-muted);margin-top:4px}.side-bottom{padding:17px 12px 12px;margin-top:auto}.wide-btn{width:100%;font-size:12.5px;border-color:var(--color-border);min-height:36px}.wide-btn.subtle{border-color:transparent;font-size:12px;margin-top:5px}.tip{margin-top:18px;padding:14px 11px;background:var(--color-surface-sunken);border-radius:var(--r-md)}.tip svg{color:var(--color-link);width:22px;height:22px;margin-bottom:8px}.tip strong{font-size:12.5px;display:block}.tip p{font-size:12px;color:var(--color-on-surface-muted);line-height:1.9;margin-top:6px}.simulation{display:flex;flex-direction:column;min-width:0}.scene-heading{padding:17px 20px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--color-border)}.scene-heading h2{font-size:16px}.badge{font-size:12px;border:1px solid var(--color-border);background:var(--color-surface-sunken);color:var(--color-on-surface-muted);padding:4px 10px;border-radius:var(--r-pill)}.badge.running{color:var(--color-tertiary);background:var(--color-tertiary-soft)}.canvas-wrap{height:458px;position:relative;flex:1;min-height:370px;overflow:hidden;background:var(--color-surface-sunken)}#world{width:100%;height:100%;display:block;touch-action:none}.canvas-toolbar{position:absolute;top:16px;inset-inline-start:16px;display:flex;gap:3px;padding:5px;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--r-md);box-shadow:var(--elev-1)}.canvas-toolbar i{width:1px;background:var(--color-border);margin:5px}.canvas-toolbar button{min-width:32px;min-height:32px;padding:5px}.active{color:var(--color-link);background:var(--color-primary-soft);border-color:transparent}.canvas-note{position:absolute;top:80px;inset-inline-start:19px;display:flex;align-items:center;gap:6px;font-size:12px;color:var(--color-on-surface-muted);pointer-events:none}.axis-dot{width:4px;height:4px;border-radius:50%;background:var(--color-primary)}.zoom-controls{position:absolute;bottom:14px;inset-inline-end:14px;background:var(--color-surface);border:1px solid var(--color-border);border-radius:10px;display:flex;align-items:center;direction:ltr;font:12.5px Arial,sans-serif}.zoom-controls span{min-width:40px;text-align:center}.zoom-controls button{min-width:30px;font-size:20px;padding:3px 7px}.zoom-controls svg{width:16px}.canvas-scale{position:absolute;inset-inline-start:19px;bottom:22px;font:12px Arial,sans-serif;color:var(--color-on-surface-muted);text-align:center;pointer-events:none}.canvas-scale span{display:block;width:48px;height:5px;border:1px solid var(--color-on-surface-muted);border-top:0;margin-top:5px}.playback{display:flex;align-items:center;justify-content:space-between;padding:14px 18px;border-top:1px solid var(--color-border);gap:10px}.playback-primary{display:flex;gap:4px;align-items:center}.playback .primary-btn{min-width:100px;font-size:13px}.clock{display:flex;align-items:center;font-size:16px;gap:5px;font-variant-numeric:tabular-nums}.clock small{font-size:12px;color:var(--color-on-surface-muted)}.clock .status-dot{background:var(--color-on-surface-muted);opacity:.5}.speed{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--color-on-surface-muted)}.speed select{font:12.5px Arial,sans-serif;min-height:31px;padding:5px 8px}.display-options{display:flex;flex-wrap:wrap;justify-content:center;gap:19px;padding:12px;border-top:1px solid var(--color-border);font-size:12px;color:var(--color-on-surface-muted)}.display-options label{display:flex;align-items:center;gap:7px;cursor:pointer}.inspector-panel{max-height:675px;display:flex;flex-direction:column}.settings-scroll{overflow:auto;padding:5px 17px 18px;scrollbar-width:thin;scrollbar-color:var(--color-border) transparent}.object-picker{display:block;font-size:12.5px;color:var(--color-on-surface-muted)}.object-picker select{display:block;width:100%;font-size:13px;margin-top:7px}.empty-selection{padding:24px 8px;text-align:center;color:var(--color-on-surface-muted)}.empty-selection svg{color:var(--color-link);width:29px;height:29px;margin-bottom:9px}.empty-selection p{font-size:12.5px;line-height:1.9}.empty-selection small{font-size:12px;opacity:.75;display:block;margin-top:5px}.field-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:12px}.field-grid label,.field-row{font-size:12px;color:var(--color-on-surface-muted);display:flex;flex-direction:column;gap:5px}.field-grid input,.field-grid select{width:100%;font-size:12.5px}.field-grid .full{grid-column:1/-1}.field-row{margin-top:10px}.field-row input{font-size:13px}.check-row{display:flex;gap:15px;font-size:12.5px;margin-top:13px}.check-row label{display:flex;gap:7px;align-items:center}.body-actions{display:flex;gap:5px;margin:14px 0}.body-actions button{flex:1;font-size:12.5px;border-color:var(--color-border)}.danger{color:var(--color-error)}.body-mass{font-size:12.5px;color:var(--color-link);margin:10px 0}.world-settings{border-top:1px solid var(--color-border);margin-top:9px;padding-top:14px}.world-settings summary{cursor:pointer;font-weight:600;font-size:13px;margin-bottom:12px}.advanced{margin-top:15px}.advanced summary{color:var(--color-on-surface-muted);font-weight:400;font-size:12.5px}.env-reset{margin-top:12px;font-size:12px;width:100%}.material-note{font-size:11.5px;color:var(--color-on-surface-muted);margin:7px 0;line-height:1.8}.readouts{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:18px}.measurement-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.metric{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--r-lg);padding:20px 16px;display:flex;flex-direction:column;justify-content:center}.metric>span{font-size:12.5px;color:var(--color-on-surface-muted)}.metric i{display:inline-block;width:6px;height:6px;border-radius:50%;margin-inline-end:6px}.kinetic-dot{background:var(--color-primary)}.potential-dot{background:var(--color-tertiary)}.total-dot{background:var(--dm-accent-secondary)}.metric strong{font:27px Alexandria,Arial,sans-serif;align-self:flex-end;margin:23px 0 16px;letter-spacing:-1px}.metric strong small{font:12px Arial;color:var(--color-on-surface-muted);letter-spacing:0}.metric>small{font-size:11.5px;color:var(--color-on-surface-muted)}.chart-panel{padding:10px 14px}.chart-header{display:flex;align-items:center;gap:12px}.tabs{display:flex;gap:5px}.tabs button{font-size:12.5px;min-height:29px}.chart-header .text-btn{margin-inline-start:auto;font-size:12px}.chart-header .text-btn svg{width:13px}.chart-window{font-size:11.5px;color:var(--color-on-surface-muted)}.chart-wrap{height:112px;position:relative}#chart{width:100%;height:100%;display:block}#chart-empty{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;color:var(--color-on-surface-muted);font-size:12px;pointer-events:none}.chart-legend{display:flex;justify-content:center;gap:20px;font-size:11.5px;color:var(--color-on-surface-muted);min-height:18px}.chart-legend i{display:inline-block;width:13px;height:2px;margin-inline-end:5px;vertical-align:middle}footer{display:flex;justify-content:space-between;align-items:center;gap:14px;color:var(--color-on-surface-muted);font-size:11.5px;padding:20px 2px}footer p{opacity:.75}.footer-brand{font-size:11.5px;letter-spacing:1px}.footer-brand b{color:var(--color-link);font-weight:400}#toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);max-width:min(560px,90vw);padding:14px 24px;background:var(--color-surface-3);border:1px solid var(--color-primary);border-radius:var(--r-md);box-shadow:var(--elev-3);z-index:20;display:none}#toast.show{display:block}dialog{background:var(--color-surface);color:var(--color-on-surface);border:1px solid var(--color-border);border-radius:20px;padding:24px;width:min(700px,92vw);max-height:86vh}dialog::backdrop{background:rgba(0,0,0,.65);backdrop-filter:blur(4px)}.dialog-heading{display:flex;justify-content:space-between;align-items:center}.dialog-heading h2{font-size:21px}.guide-content{font-size:14px;line-height:2;padding:16px 0}.guide-content h3{color:var(--color-link);margin:20px 0 9px}.guide-content p{color:var(--color-on-surface-muted);margin:9px 0}.shortcuts{display:grid;grid-template-columns:1fr 1fr;gap:10px}.shortcuts span{display:flex;justify-content:space-between;border-bottom:1px solid var(--color-border);padding:6px}.shortcuts kbd{font:12.5px Arial;padding:5px;background:var(--color-surface-sunken);border:1px solid var(--color-border);border-radius:5px;align-self:center}.loading{min-height:90vh;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:20px}.mobile-tools,.mobile-close{display:none}
@media(min-width:1550px){.workspace{grid-template-columns:240px minmax(350px,1fr) 300px}.canvas-wrap{min-height:460px}.inspector-panel{max-height:740px}}
@media(max-width:1150px){main{padding:22px 16px 0}.header{padding:0 20px}.header-label,.header-divider{display:none}.workspace{grid-template-columns:185px minmax(300px,1fr) 245px;gap:10px}.preset{padding:10px 5px;gap:7px}.preset strong{font-size:12px}.preset small{font-size:11.5px}.panel-heading{padding:17px 12px 12px}.panel-heading h2{font-size:13px}.settings-scroll{padding:5px 12px 15px}.readouts{grid-template-columns:1fr}.metric{padding:14px 20px}.metric strong{margin:16px 0 10px}.clock{font-size:14px}.playback{padding:12px 8px;gap:4px}.speed{gap:3px}.display-options{gap:11px}.tip{padding:10px 7px}}
@media(max-width:900px){.workspace{grid-template-columns:1fr}.mobile-tools{display:flex;gap:8px;margin:0 0 12px}.mobile-tools button{background:var(--color-surface);border-color:var(--color-border);font-size:13px}.experiments,.inspector-panel{display:none;position:fixed;top:12px;bottom:12px;width:300px;max-height:none;z-index:15;box-shadow:0 0 0 100vmax rgba(0,0,0,.5);overflow:auto}.experiments{inset-inline-start:12px}.inspector-panel{inset-inline-end:12px}.experiments.is-open,.inspector-panel.is-open{display:flex}.mobile-close{display:inline-flex;font-size:22px;min-height:28px}.preset strong{font-size:14px}.preset small{font-size:12.5px}.canvas-wrap{height:440px;min-height:440px}.tip{margin-top:10px}.intro-badge{display:none}.intro{margin-bottom:18px}.header{height:70px}.header-actions{gap:3px}.header-actions .text-btn span{display:none}.header-actions .outline-btn{font-size:12.5px}.header-actions .text-btn{padding:7px}.header{gap:12px}.brand strong{font-size:14px}.brand img{width:33px;height:33px}.brand small{font-size:12px}.intro h1{font-size:25px}.settings-scroll{overflow:auto}.panel-heading h2{font-size:14px}.speed{gap:8px}.display-options{gap:20px}.clock{font-size:16px}.playback{padding:12px 16px}.measurement-cards{gap:10px}}
@media(max-width:520px){main{padding:18px 10px 0}.header{padding:0 12px}.brand strong{font-size:13px}.brand img{width:30px;height:30px}.brand{gap:6px}.header-actions .outline-btn span{display:none}.header-actions button{min-width:32px;padding:6px}.header-actions svg{width:17px}.intro p{font-size:12.5px;line-height:1.9}.intro h1{font-size:24px}.canvas-wrap{min-height:390px;height:390px}.scene-heading{padding:14px}.scene-heading h2{font-size:14px}.canvas-toolbar{inset-inline-start:10px;top:12px}.canvas-note{font-size:11.5px;top:70px}.display-options{gap:10px;font-size:11.5px}.playback{padding:10px 7px;gap:3px}.playback .primary-btn{min-width:77px;padding:8px 10px}.playback .icon-btn{min-width:31px;padding:5px}.clock{font-size:14px;gap:2px}.clock .status-dot{display:none}.speed{font-size:11.5px;gap:4px}.measurement-cards{gap:7px}.metric{padding:14px 10px}.metric>span{font-size:12px}.metric strong{font-size:19px;letter-spacing:-.8px}.metric>small{font-size:11px;line-height:1.7}.chart-header{gap:4px}.chart-window{display:none}footer{flex-wrap:wrap;justify-content:center;line-height:1.8;text-align:center}footer p{order:3;flex-basis:100%}.shortcuts{grid-template-columns:1fr}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
/* Keep canvas bitmap dimensions out of flex/grid intrinsic sizing. */
#world{position:absolute;inset:0}
@media(min-width:901px){.workspace{height:720px}.experiments{overflow-y:auto;scrollbar-width:thin}.inspector-panel{max-height:none;min-height:0}.settings-scroll{min-height:0;flex:1}.canvas-wrap{min-height:0}}
@media(min-width:1550px){.workspace{height:740px}}

/* Hydraulic circuits use the same canvas and playback, with circuit-specific controls. */
.hyd-feedback,#experiment-description{display:none}.hydraulic-mode .canvas-toolbar,.hydraulic-mode .canvas-note,.hydraulic-mode .zoom-controls,.hydraulic-mode .canvas-scale,.hydraulic-mode .display-options,.hydraulic-mode .object-picker,.hydraulic-mode .world-settings>summary{display:none}.hydraulic-mode .hyd-feedback{display:block;padding:10px 18px 14px;border-top:1px solid var(--color-border)}.hydraulic-mode #experiment-description{display:block;font-size:12.5px;line-height:1.9;color:var(--color-on-surface-muted);padding:9px 18px;border-bottom:1px solid var(--color-border)}#hyd-status{font-size:12.5px;color:var(--color-link);line-height:1.8;margin-bottom:9px}#hyd-readings{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px 15px}#hyd-readings div{display:flex;flex-direction:column;gap:6px}#hyd-readings span{font-size:11.5px;color:var(--color-on-surface-muted)}#hyd-readings strong{font:13px Alexandria,Arial,sans-serif;align-self:flex-start}.hyd-control-heading{font-size:13px;font-weight:600;margin:7px 0 14px}.hyd-explanation p{font-size:12.5px;line-height:1.9;margin:10px 0}.hyd-explanation h3{font-size:13px;color:var(--color-link);margin:16px 0 7px}.hyd-formula{border:1px solid var(--color-border);border-radius:10px;background:var(--color-surface-sunken);padding:12px 8px;font:13px/2.2 Consolas,monospace;text-align:center}.hyd-explanation .hyd-assumptions{font-size:11.5px;color:var(--color-on-surface-muted)}.hyd-explanation a{font-size:12px}.hyd-slider{display:flex;flex-direction:column;gap:8px;font-size:12.5px;margin-top:18px}.hyd-slider input{width:100%;padding:0;accent-color:var(--color-primary)}.hyd-slider span{direction:ltr;text-align:start;font-size:13px;color:var(--color-link)}.hyd-check{display:flex;align-items:center;gap:8px;font-size:12.5px;margin:14px 0}.hyd-cycle{margin-top:15px;background:var(--color-primary-soft);color:var(--color-link)}.hyd-actions{display:flex;gap:5px;margin-top:12px}.hyd-actions button{flex:1;border-color:var(--color-border);font-size:12px}.hydraulic-mode .world-settings{display:block}.experiments #preset-list{flex-shrink:0}.experiments .side-bottom{flex-shrink:0}
@media(max-width:520px){.hydraulic-mode .canvas-wrap{min-height:360px;height:360px}.hydraulic-mode #experiment-description{font-size:12px;padding:8px 12px}.hydraulic-mode .hyd-feedback{padding:10px 12px}#hyd-readings{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}#hyd-readings span{font-size:11.5px}.hydraulic-mode .metric{padding:12px 7px}.hydraulic-mode .metric>span{font-size:11.5px;line-height:1.7}.hydraulic-mode .metric strong{font-size:17px}.hydraulic-mode .metric>small{font-size:11px}}
.light .brand b{color:var(--color-link)}

.hydraulic-mode .tip{display:none}

/* ── Dr. Machine: the platform's header and type (as the Circuit Lab's) ──
   Back to the tools, the company lockup (small tier: gear, DR, MACHINE — LTR
   always), the lab's name; Alexandria for Arabic, Inter and Space Grotesk for
   Latin. Text sizes were raised: no caption below 11.5px, Arabic below 12. */
.header{height:60px;padding:0 20px;gap:16px}
.back-link{display:inline-flex;align-items:center;gap:6px;flex-shrink:0;padding:7px 11px;border:1px solid var(--color-border);border-radius:var(--r-md);color:var(--color-on-surface);text-decoration:none;font-weight:600;font-size:13px;white-space:nowrap}
.back-link:hover{background:var(--color-surface-3)}
.back-link svg{width:16px;height:16px}
[dir=rtl] .rtl-flip{transform:scaleX(-1)}
.brand{gap:7px;flex-shrink:0}
.brand img{display:block;width:32px;height:32px;filter:drop-shadow(0 0 6px rgba(36,169,224,.25))}
.brand span{display:flex;flex-direction:column;font:800 14px/1.02 Alexandria,sans-serif;color:var(--dm-logo-machine)}
.brand b,.light .brand b{font-weight:inherit;color:var(--color-primary)}
.lab-title{min-width:0}
.lab-title strong{display:block;font:700 16px/1.25 "Space Grotesk",Alexandria,sans-serif;color:var(--color-on-surface);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
[dir=rtl] .lab-title strong{font-family:Alexandria,sans-serif;font-size:17px}
.lang-switch{display:inline-flex;align-items:center;min-height:36px;padding:6px 10px;border-radius:var(--r-sm);color:var(--color-link);font-weight:700;font-size:12.5px;text-decoration:none}
.lang-switch:hover{background:var(--color-surface-3)}
[dir=ltr] body{font-family:Inter,Alexandria,'IBM Plex Sans Arabic',Arial,sans-serif}
[dir=ltr] h1,[dir=ltr] h2,[dir=ltr] h3{font-family:"Space Grotesk",Alexandria,sans-serif}
/* Letter-spacing breaks Arabic letter joining. */
[dir=rtl] *{letter-spacing:normal!important}
[dir=rtl] :is(.preset small,.panel-hint,.badge,.canvas-note,.speed,.display-options,.metric>small,.chart-window,.chart-legend,.material-note,.field-grid label,.field-row,footer,.tip p,.wide-btn.subtle){font-size:12px}
/* The active experiment's bar sits at the start edge in either direction. */
[dir=ltr] .preset.active{box-shadow:inset 3px 0 var(--color-primary)}
@media(max-width:1150px){.header-divider{display:none}}
@media(max-width:600px){.header{padding:0 12px;gap:8px}.back-link{padding-inline:7px}.back-link span,.brand span{display:none}.header-actions{gap:2px}}