.course-app{color:#e7eeef;background:#09151e;height:100dvh;min-height:600px;font:16px Arial,Helvetica,sans-serif;position:relative;overflow:hidden}.course-scene,.course-shade{position:absolute;inset:0}.course-shade{pointer-events:none;background:linear-gradient(90deg,#09151e88,#0000 55%),linear-gradient(#09151ecc,#0000 16% 80%,#09151eee)}.course-header{z-index:4;align-items:center;gap:26px;display:flex;position:absolute;top:23px;left:28px;right:28px}.course-brand{letter-spacing:-1px;align-items:center;gap:10px;font-size:27px;font-weight:700;display:flex}.course-brand svg,.accent{color:#cee7a8}.course-context{color:#a9b9c1;font-size:14px}.course-context i{color:#47606e;margin:0 12px;font-style:normal}.course-header nav{align-items:center;gap:9px;margin-left:auto;display:flex}.course-header nav button,.course-header nav a{color:#dbe5e9;background:#14232fbd;border-radius:9px;align-items:center;gap:8px;padding:10px 14px;font-size:14px;display:flex}.course-header nav a{color:#b7cdac}.course-header nav button:hover,.course-header nav a:hover{background:#2a424e}.lesson-panel{-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);z-index:3;background:linear-gradient(135deg,#14232ff5,#101e29eb);border-radius:18px;flex-direction:column;width:390px;display:flex;position:absolute;top:90px;bottom:123px;left:28px;overflow:hidden;box-shadow:0 14px 60px #0003}.lesson-meta{color:#abc494;letter-spacing:.7px;text-transform:uppercase;justify-content:space-between;align-items:center;gap:8px;padding:18px 23px 0;font-size:12px;display:flex}.course-icon{color:#a4b4bd;background:0 0;padding:5px;display:flex}.lesson-panel h1{letter-spacing:-.65px;margin:15px 23px 10px;font-size:27px;font-weight:600;line-height:1.18}.lesson-summary{color:#bacad3;margin:0 23px 19px;font-size:16px;line-height:1.5}.lesson-tabs{flex-shrink:0;gap:1px;margin:0 16px;display:flex}.lesson-tabs button{color:#9eb1bf;background:0 0;border-bottom:2px solid #0000;padding:12px 9px;font-size:12px}.lesson-tabs button[aria-selected=true]{color:#ddedc8;border-bottom-color:#cee7a8}.lesson-content{scrollbar-width:thin;scrollbar-color:#3a5260 transparent;flex:1;min-height:0;padding:7px 23px 24px;overflow:auto}.lesson-content p{color:#bdccd4;margin:16px 0;font-size:16px;line-height:1.65}.lesson-content h2{color:#e4edef;margin:23px 0 14px;font-size:18px;font-weight:500;line-height:1.45}.lesson-task{background:#1f353c9c;border-radius:10px;margin-top:23px;padding:17px 18px}.lesson-task>span,.lesson-overline{letter-spacing:1.5px;color:#c5d8b4;font-size:11px}.lesson-task p{margin:10px 0 15px}.course-primary{color:#17261e;background:#cee7a8;border-radius:7px;justify-content:center;align-items:center;gap:9px;padding:10px 14px;font-size:14px;font-weight:600;display:inline-flex}.course-primary:hover{background:#e0f2c4}.course-secondary{color:#d2e0e6;background:#273b47;border-radius:7px;align-items:center;gap:8px;padding:10px 12px;font-size:13px;display:inline-flex}.lesson-navigation{background:#101d27ee;flex-shrink:0;align-items:center;gap:13px;padding:16px 20px;display:flex}.lesson-navigation>button:first-child{color:#c0cdd4;background:0 0;padding:7px;display:flex}.lesson-navigation>span{min-width:55px;font-size:14px}.lesson-navigation small{color:#839da9;margin-top:4px;font-size:10px;display:block}.lesson-navigation .course-primary{margin-left:auto}.lesson-navigation button:disabled{opacity:.35;cursor:default}.lesson-content details{color:#aec5d0;margin-top:20px;padding:12px 0;font-size:14px}.lesson-content summary{cursor:pointer}.lesson-content details p{font-size:14px}.experiment-instruction{padding-bottom:10px}.course-control{margin:22px 0;display:block}.course-control>span{justify-content:space-between;gap:10px;font-size:14px;line-height:1.3;display:flex}.course-control output{color:#d4e8b7;font-variant-numeric:tabular-nums;white-space:nowrap}.course-control input,.time-scrub input{accent-color:#c5dfa2;cursor:pointer;width:100%;height:5px;margin:14px 0 8px;display:block}.course-control small{color:#758e9c;justify-content:space-between;font-size:11px;display:flex}.lab-presets{flex-wrap:wrap;gap:7px;margin:14px 0;display:flex}.lab-presets button{color:#bed3df;background:#243844;border-radius:6px;padding:8px 10px;font-size:12px}.equation-list{gap:10px;margin:22px 0;display:grid}.equation-list>div{overflow-wrap:anywhere;color:#d8e8c7;background:#0b1721;border-radius:8px;padding:13px;font-family:Georgia,serif;font-size:18px;line-height:1.6}.variable-card{border-bottom:1px solid #293d475e;gap:16px;padding:16px 0;display:flex}.variable-card>span{color:#cee7a8;overflow-wrap:anywhere;min-width:60px;max-width:85px;font-family:Georgia,serif;font-size:22px}.variable-card strong{font-size:14px;font-weight:500;line-height:1.4;display:block}.variable-card small{color:#8da5b1;margin:5px 0;display:block}.variable-card p{color:#a9bec9;margin:7px 0;font-size:14px;line-height:1.55}.knowledge-check{padding-top:18px}.answer-option{text-align:left;color:#c8d9e0;background:#1d303d;border:1px solid #0000;border-radius:9px;align-items:center;gap:13px;width:100%;margin:10px 0;padding:14px;font-size:14px;line-height:1.5;display:flex}.answer-option>span{color:#8aa1b0}.answer-option.selected{border-color:#8da6b7}.answer-option.correct{background:#263b31;border-color:#bed898}.answer-feedback{background:#263b315e;border-radius:8px;margin-top:18px;padding:16px;font-size:15px}.answer-feedback p{margin:9px 0 0;font-size:14px}.quiet{color:#839eac!important;font-size:12px!important}.lesson-source{border-bottom:1px solid #263b48;padding:15px 0}.lesson-source strong,.lesson-source a{color:#c5d7b3;font-size:14px;line-height:1.5}.lesson-source a:hover{text-decoration:underline}.lesson-source code{color:#839ca9;overflow-wrap:anywhere;margin-top:7px;font-size:11px;line-height:1.7;display:block}.lesson-source p{margin:8px 0;font-size:13px;line-height:1.5}.lab-readouts{-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);z-index:2;scrollbar-width:thin;background:#10212bd9;border-radius:12px;width:270px;max-height:37vh;padding:15px 18px;position:absolute;top:95px;right:28px;overflow:auto}.readout-heading{text-align:left;color:#a4bac6;letter-spacing:1px;text-transform:uppercase;background:0 0;justify-content:space-between;align-items:center;width:100%;padding:0 0 8px;font-size:11px;display:flex}.lab-readouts dl{margin:0}.lab-readouts dl>div{justify-content:space-between;gap:16px;padding:8px 0;font-size:12px;display:flex}.lab-readouts dt{color:#8fa9b7;line-height:1.35}.lab-readouts dd{text-align:right;color:#dbe7e9;font-variant-numeric:tabular-nums;white-space:nowrap;margin:0}.model-warning{color:#dec8a4;border-top:1px solid #35434a;padding-top:9px;line-height:1.5;font-size:11px!important}.plot-dock{z-index:2;width:360px;position:absolute;bottom:148px;right:28px}.lab-plot{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#10212bdf;border-radius:12px;margin:0;padding:17px 16px 8px}.lab-plot figcaption strong{font-size:14px;font-weight:500;display:block}.lab-plot figcaption span{color:#8da8b7;margin-top:7px;font-size:11px;line-height:1.5;display:block}.lab-plot svg{width:100%;margin-top:7px;display:block;overflow:visible}.lab-plot svg text{fill:#8ca8b7;font-family:Arial,sans-serif;font-size:11px}.lab-plot svg line{stroke-width:1.5px}.lab-plot svg rect[role=button]{cursor:pointer}.lab-tools{z-index:2;gap:7px;display:flex;position:absolute;bottom:101px;right:28px}.lab-tools button{color:#a9c0cc;background:#152b37;border-radius:7px;align-items:center;padding:9px 12px;font-size:12px;display:flex}.lab-tools button[aria-pressed=true]{color:#d2e8b8}.course-transport{-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);z-index:3;background:#172a36e8;border-radius:13px;align-items:center;gap:16px;width:min(530px,100% - 480px);padding:13px 17px;display:flex;position:absolute;bottom:42px;left:calc(50% + 160px);transform:translate(-50%)}.course-transport button{color:#b9cad4;background:0 0;padding:4px;display:flex}.course-transport .course-play{color:#183126;background:#cee7a8;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:36px;height:36px}.time-scrub{flex:1;min-width:0}.time-scrub label{color:#c7d5dc;justify-content:space-between;gap:12px;font-size:12px;display:flex}.time-scrub label span{color:#8ba6b4;font-variant-numeric:tabular-nums;font-size:11px}.time-scrub input{margin:11px 0 3px}.course-transport select{color:#cee7a8;background:#203846;border:0;border-radius:6px;max-width:100px;padding:8px;font-size:12px}.course-footer{color:#688593;pointer-events:none;z-index:2;justify-content:space-between;gap:20px;font-size:10px;display:flex;position:absolute;bottom:13px;left:28px;right:28px}.course-footer a{pointer-events:auto}.lab-world-label{pointer-events:none;white-space:nowrap;text-shadow:0 1px 5px #000,0 1px 9px #000;background:#0b1c2666;border-radius:4px;padding:3px 5px;font-size:11px;position:absolute;top:0;left:0}.show-lesson{z-index:3;background:#152a35;border-radius:8px;align-items:center;gap:12px;padding:12px 16px;font-size:14px;display:flex;position:absolute;top:100px;left:28px}.lab-loading,.lab-error{color:#a4beca;z-index:1;max-width:400px;font-size:16px;line-height:1.6;position:absolute;top:45%;left:50%}.course-modal-backdrop{-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);z-index:20;background:#040d15b3;justify-content:center;align-items:center;padding:30px;display:flex;position:absolute;inset:0}.course-modal{background:#12232e;border-radius:18px;flex-direction:column;width:830px;max-width:100%;max-height:90dvh;padding:30px;display:flex;box-shadow:0 25px 150px #0008}.course-modal>header{justify-content:space-between;align-items:center;gap:20px;display:flex}.course-modal h2{letter-spacing:-.4px;margin:10px 0 23px;font-size:25px;font-weight:500}.course-modal>header button{color:#b5cbd6;background:0 0;padding:8px}.course-search{color:#8da7b7;background:#0c1922;border-radius:9px;flex-shrink:0;align-items:center;gap:12px;padding:13px 16px;display:flex}.course-search input{color:#d7e3e8;background:0 0;border:0;outline:none;width:100%;font-size:15px}.course-modal-scroll{scrollbar-width:thin;margin-top:12px;padding:8px 10px 0 0;overflow:auto}.course-chapter h3{align-items:center;gap:16px;margin:28px 0 13px;font-size:16px;font-weight:500;display:flex}.course-chapter h3>span{color:#accb8a;font-size:12px}.course-lesson-link{text-align:left;color:#cad9e0;background:0 0;border-radius:9px;align-items:center;gap:18px;width:100%;padding:14px 12px;display:flex}.course-lesson-link:hover{background:#243b47}.course-lesson-link.current{color:#e0edcf;background:#2b443a}.course-lesson-link>span{color:#96b17d;min-width:22px;font-size:12px}.course-lesson-link>div{flex:1}.course-lesson-link strong{font-size:15px;font-weight:500}.course-lesson-link small{color:#8fa9b8;margin-top:6px;font-size:12px;line-height:1.5;display:block}.case-actions{flex-wrap:wrap;gap:8px;margin-top:20px;display:flex}.case-table{margin-top:20px;overflow:auto}.case-table table{border-collapse:collapse;width:100%;font-size:11px}.case-table caption{color:#92aab6;margin-bottom:10px}.case-table th,.case-table td{text-align:left;border-bottom:1px solid #344955;padding:10px 4px}.case-table button{color:#bfdaa0;background:0 0;padding:5px 0;font-size:11px}.case-table>button{margin-top:10px}.without-panel .course-transport{width:min(530px,100% - 50px);left:50%}@media (min-width:1600px){.lesson-panel{width:430px}.lesson-content p{font-size:17px}.lesson-tabs button{padding:12px;font-size:13px}.plot-dock{width:420px}.lab-readouts{width:300px}.lab-readouts dl>div{font-size:13px}.course-transport{left:calc(50% + 100px)}}@media (max-width:1100px){.lesson-panel{width:345px;left:20px}.lesson-panel h1{font-size:24px}.lesson-tabs button{padding:11px 6px}.lesson-content{padding-left:20px;padding-right:20px}.lesson-content p{font-size:15px}.lab-readouts{width:230px;right:20px}.plot-dock{width:280px;bottom:150px;right:20px}.course-context{display:none}.course-transport{gap:10px;width:calc(100% - 410px);left:calc(50% + 150px)}.course-footer{font-size:9px}.time-scrub label span{font-size:10px}}@media (max-width:760px){.course-app{min-height:640px}.course-header{gap:10px;top:15px;left:16px;right:16px}.course-brand{font-size:23px}.course-header nav{gap:4px}.course-header nav button,.course-header nav a{padding:9px;font-size:11px}.course-header nav button span{display:none}.lesson-panel{border-radius:14px;width:auto;height:44dvh;inset:auto 12px 102px}.lesson-meta{padding-top:10px}.lesson-panel h1{margin:8px 20px;font-size:21px}.lesson-summary{display:none}.lesson-tabs{margin:0 14px}.lesson-tabs button{flex:1;font-size:11px}.lesson-content{padding-top:0}.lesson-content p{font-size:15px;line-height:1.55}.lesson-navigation{padding:10px 16px}.lesson-navigation .course-primary{padding:8px 12px}.lesson-navigation small{display:none}.lab-readouts{width:190px;max-height:23vh;padding:10px 12px;top:76px;right:12px}.lab-readouts dl>div{padding:5px 0;font-size:10px}.readout-heading{font-size:9px}.model-warning,.plot-dock{display:none}.lab-tools{flex-direction:column;inset:78px auto auto 12px}.lab-tools button{padding:8px;font-size:10px}.course-transport,.without-panel .course-transport{gap:12px;width:auto;padding:11px;bottom:36px;left:12px;right:12px;transform:none}.course-footer{font-size:8px;line-height:1.4;bottom:10px;left:12px;right:12px}.course-footer>span:first-child{max-width:55%}.course-modal-backdrop{padding:10px}.course-modal{max-height:95dvh;padding:20px}.course-modal h2{font-size:22px}.course-lesson-link{gap:12px;padding:12px 7px}.course-lesson-link small{font-size:11px}.course-search input{font-size:13px}.show-lesson{max-width:calc(100% - 24px);top:auto;bottom:105px;left:12px}.lab-loading,.lab-error{font-size:13px;top:32%;left:18%}.lab-world-label{font-size:9px}.without-panel .plot-dock{width:260px;display:block;bottom:157px;left:12px}.without-panel .lab-readouts{max-height:35vh}}@font-face{font-family:OrbitalMath;src:url(/fonts/stix-two-math.woff2)format("woff2");font-display:swap}.math-inline,.equation-list>div,.variable-card>span{font-family:OrbitalMath,STIX Two Math,serif}.inline-experiment{color:#c5dfaa;background:0 0;align-items:center;gap:8px;padding:15px 0 0;font-size:12px;display:flex}.lab-world-label:empty{display:none}.course-modal button:focus-visible,.course-modal input:focus-visible{outline-offset:2px;outline:2px solid #cee7a8}.choice-control{justify-content:space-between;align-items:center;gap:10px;display:flex}.choice-control select{color:#d0e5b4;background:#243a48;border:0;border-radius:6px;max-width:60%;padding:9px;font-size:12px}.lab-world-label{font-family:Arial,Helvetica,sans-serif;font-size:11px}.lab-world-label.math-label{font-family:OrbitalMath,serif;font-size:15px}.answer-option>.answer-text{color:inherit}.lab-world-label{font-size:12px}.lab-world-label.math-label{font-size:19px}.lab-world-label.variable-label{pointer-events:auto;cursor:pointer;z-index:1;background:#10212be8;border:1px solid #66818c80;border-radius:6px;min-width:30px;min-height:30px;padding:3px 7px;line-height:1.25}.lab-world-label.variable-label:hover{background:#29424f;border-color:currentColor}.lab-world-label.variable-label:focus-visible{outline-offset:3px;outline:2px solid #cee7a8}.lab-world-label.variable-label{z-index:2;background:0 0;border:0;min-width:0;min-height:0;padding:0}.variable-trigger{font:inherit;color:inherit;cursor:pointer;background:#10212be8;border:1px solid #66818c80;border-radius:6px;min-width:30px;min-height:30px;padding:3px 7px;line-height:1.25}.variable-trigger:hover{background:#29424f;border-color:currentColor}.variable-trigger:focus-visible,.variable-close:focus-visible{outline-offset:3px;outline:2px solid #cee7a8}.variable-callout{white-space:normal;width:260px;text-shadow:none;color:#d8e5eb;text-align:left;cursor:default;background:#152a36f5;border:1px solid #45616f;border-radius:10px;padding:15px 30px 14px 15px;font:14px/1.5 Arial,Helvetica,sans-serif;position:absolute;top:0;left:calc(100% + 10px);box-shadow:0 8px 24px #0005}.variable-callout strong{font-size:14px;font-weight:600;display:block}.variable-callout small{color:#95b0bd;margin:4px 0 8px;display:block}.variable-callout p{margin:0;font-size:14px;line-height:1.5}.variable-close{color:#b7ccd7;cursor:pointer;background:0 0;padding:3px 7px;font-size:21px;position:absolute;top:4px;right:5px}.callout-left .variable-callout{left:auto;right:calc(100% + 10px)}.callout-up .variable-callout{top:auto;bottom:0}.lab-screen-overlay{pointer-events:none;z-index:1;width:100%;height:100%;position:absolute;inset:0;overflow:hidden}.lab-world-label{z-index:2;align-items:flex-start;width:max-content;max-width:calc(100% - 16px)}.lab-world-label.callout-open{z-index:3;gap:10px}.lab-world-label .variable-callout{flex-shrink:0;width:250px;position:relative;inset:auto}.lab-world-label .variable-trigger{flex-shrink:0}.lab-world-label.variable-label:hover{background:0 0}@media (max-width:760px){.lab-world-label .variable-callout{width:230px;font-size:13px}.variable-callout p{font-size:13px}}.lab-world-label{z-index:2}.lab-world-label.variable-label{z-index:3}.lab-world-label.variable-label.callout-open{z-index:4}.study-variable{color:#cfe8b0;font:inherit;line-height:inherit;cursor:pointer;background:0 0;border-radius:3px;padding:0 1px;text-decoration:none;display:inline}.study-variable:hover,.study-variable[aria-pressed=true]{color:#fff3a0;background:#f1eaa329}.study-variable:focus-visible{outline-offset:2px;outline:2px solid #fff3a0}.math-prose{font-family:inherit}.study-variable.math-inline,.study-highlight text{font-family:OrbitalMath,serif}.study-selection{color:#fff3a0;background:#fff3a015;justify-content:space-between;align-items:center;margin:5px 23px 0;padding:7px 10px;font-size:12px;display:flex}.study-selection button{color:inherit;background:0 0;font-size:19px}.lab-screen-overlay.selected-vector{filter:drop-shadow(0 0 5px var(--highlight-color,#fff3a0))}.selected-vector>line,.selected-vector>path{stroke-width:4px}.lab-world-label.selected-variable{z-index:5}.selected-variable .variable-trigger{color:var(--highlight-color,#fff3a0);outline:2px solid var(--highlight-color,#fff3a0);background:#263c43}.study-highlight{z-index:2;filter:drop-shadow(0 0 3px color-mix(in srgb,var(--highlight-color,#fff3a0) 38%,transparent))}.lesson-legend{z-index:3;-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);scrollbar-width:thin;scrollbar-color:#38505b transparent;background:#10212bee;border-radius:14px;width:310px;padding:16px 17px;position:absolute;top:90px;bottom:145px;right:28px;overflow-y:auto}.legend-heading{color:#e7eeef;background:0 0;justify-content:space-between;width:100%;padding:0;font-size:17px;font-weight:600;display:flex}.legend-hint{color:#91a8b6;margin:7px 0 12px;font-size:12px;line-height:1.5}.legend-quantity{border-top:1px solid #ffffff12;padding:12px 0}.quantity-title{justify-content:space-between;align-items:center;gap:10px;font-size:13px;display:flex}.quantity-title .study-variable{text-align:left;text-decoration:none}.quantity-title .math-inline{margin-right:6px;font-size:21px}.quantity-title output{font-variant-numeric:tabular-nums;white-space:nowrap;font-size:13px}.quantity-visual{align-items:center;gap:8px;display:flex}.quantity-visual svg{fill:none;cursor:pointer;flex-shrink:0;width:124px;height:104px}.mini-axes{stroke:#58717c;stroke-width:1px}.mini-axes text{fill:#9fb5bf;stroke:none;font:11px Arial}.quantity-components{color:#d1dee2;overflow-wrap:anywhere;font-variant-numeric:tabular-nums;font-size:12px;line-height:1.5;display:block}.quantity-visual small{color:#91a8b6;margin-top:5px;font-size:10px;line-height:1.5;display:block}.legend-parameters{border-top:1px solid #526571;margin-top:12px;padding-top:14px}.legend-parameters h2{margin:0;font-size:17px}.legend-control{margin:15px 0;font-size:12px;display:block}.legend-control>span{justify-content:space-between;gap:12px;line-height:1.5;display:flex}.legend-control output{color:#d0e5b2;white-space:nowrap}.legend-control input{accent-color:#cfe7ac;width:100%;margin-top:9px}.legend-control select{color:#e7eeef;background:#233c49;border:1px solid #3c5461;border-radius:5px;width:100%;margin-top:7px;padding:7px;display:block}.legend-extra{color:#aac1cb;margin:12px 0;font-size:12px}.legend-extra summary{cursor:pointer;padding:5px 0}.legend-extra dl>div{justify-content:space-between;gap:14px;margin:10px 0;display:flex}.legend-extra dd{text-align:right;color:#e0e9ec;margin:0}.legend-collapsed{bottom:auto}.lesson-legend .model-warning{font-size:11px;line-height:1.5}@media (max-width:1100px) and (min-width:761px){.lesson-legend{width:275px;right:15px}.lesson-panel{width:330px;left:15px}.quantity-visual svg{width:100px}}@media (max-width:760px){.lesson-legend{width:240px;max-height:30vh;padding:12px;top:76px;bottom:auto;right:12px}.lesson-legend .quantity-visual svg{width:100px}.legend-heading{font-size:15px}.quantity-title{font-size:12px}.quantity-title output{font-size:11px}}.quantity-visual svg{width:96px;height:76px}.legend-quantity{padding:8px 0}.legend-hint{margin:6px 0 8px}.quantity-visual small{font-size:11px}.quantity-components{font-size:12px}@media (min-width:1101px){.lesson-legend{bottom:105px}.lab-tools{right:360px}}.plane-key{color:#c1d3da;background:#24384480;border-radius:6px;gap:5px;margin:10px 0;padding:9px 10px;font-size:12px;display:grid}.plane-key strong{color:#e0eddf;font-variant-numeric:tabular-nums;font-size:12px;font-weight:500}.plane-key small{color:#93aab7;font-size:10px}.quantity-title output{font-variant-numeric:tabular-nums;font-feature-settings:"tnum";text-align:right;flex-shrink:0;min-width:13ch;font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,Liberation Mono,monospace}.legend-control output,.legend-extra dd,.plane-key strong{font-variant-numeric:tabular-nums;font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,Liberation Mono,monospace}.show-legend{z-index:3;color:#cbdbe2;background:#14232fee;border-radius:9px;align-items:center;gap:8px;padding:12px 14px;font-size:13px;display:flex;position:absolute;top:90px;right:28px}.show-legend:hover{background:#243b48}.legend-heading{align-items:center}.legend-heading .course-icon{padding:0}.show-legend:focus-visible{outline-offset:3px;outline:2px solid #cee7a8}@media (max-width:760px){.show-legend{padding:10px;font-size:12px;top:76px;right:12px}}.playback-dock{z-index:3;flex-direction:column;align-items:center;gap:12px;width:min(575px,100% - 56px);display:flex;position:absolute;bottom:42px;left:50%;transform:translate(-50%)}.playback-dock .course-transport{width:100%;min-width:0;position:static;transform:none}.playback-dock .lab-tools{flex-direction:row;flex-shrink:0;order:-1;justify-content:center;align-items:center;position:static}.without-panel .playback-dock{left:50%}.playback-dock .time-scrub{min-width:0}@media (max-width:760px){.playback-dock{gap:7px;width:auto;bottom:36px;left:12px;right:12px;transform:none}.without-panel .playback-dock{left:12px}.playback-dock .lab-tools{gap:7px}.lesson-panel{bottom:143px}.show-lesson{bottom:148px}}.course-app{--panel-text-size:16px}.lesson-legend{font-size:var(--panel-text-size)}.lesson-legend :is(.legend-hint,.quantity-title,.quantity-title output,.legend-control,.legend-extra,.plane-key,.plane-key strong,.plane-key small,.quantity-visual small,.model-warning){font-size:var(--panel-text-size);line-height:1.5}.quantity-title{flex-wrap:wrap;gap:4px 10px}.quantity-title output{margin-left:auto}.legend-control>span{flex-wrap:wrap;gap:4px 12px}.legend-control output{margin-left:auto}@media (min-width:1600px){.course-app{--panel-text-size:17px}}@media (max-width:1100px){.course-app{--panel-text-size:15px}}.legend-quantity{cursor:pointer;border:1px solid #0000;border-top-color:#ffffff12;border-radius:8px;margin:0 -8px;padding:10px 8px}.legend-quantity:hover{border-color:#58717c}.legend-quantity[aria-pressed=true]{border-color:#fff3a0}.legend-quantity:focus-visible{outline-offset:2px;outline:2px solid #cee7a8}.quantity-name{color:#cfe8b0}.legend-parameters h3{font-size:var(--panel-text-size);color:#cee7a8;margin:22px 0 10px;font-weight:500}.legend-link-note{color:#91a8b6;margin:0 0 12px;font-size:13px;line-height:1.5}.legend-parameters>dl>div{margin:12px 0}.legend-parameters>dl dd{text-align:left;overflow-wrap:anywhere;margin:4px 0 0}.inspector-switches{z-index:4;gap:6px;display:flex;position:absolute;top:88px;right:28px}.inspector-switches button{color:#b9cbd4;background:#14232fee;border:1px solid #0000;border-radius:8px;padding:9px 12px;font-size:14px}.inspector-switches button[aria-pressed=true]{color:#cee7a8;background:#20332fee;border-color:#7a9463}.inspector-switches button:focus-visible{outline-offset:2px;outline:2px solid #cee7a8}.inspector-panels .lesson-legend{width:310px;max-height:calc(100dvh - 240px);top:134px;bottom:auto}.inspector-panels.both-open .variables-panel{right:352px}.parameters-panel .legend-parameters{border:0;margin:16px 0 0;padding:0}.parameters-panel .legend-parameters+.legend-parameters{border-top:1px solid #344955;margin-top:20px;padding-top:16px}.parameters-panel .legend-parameters h2{color:#cee7a8;margin:0 0 12px;font-size:15px;font-weight:500}@media (max-width:760px){.inspector-switches{top:76px;right:12px}.inspector-switches button{padding:8px;font-size:12px}.inspector-panels .lesson-legend{width:260px;max-height:calc(50dvh - 135px);top:119px;right:12px}}.inspector-panels .variables-panel,.inspector-panels.both-open .variables-panel{width:min(760px,100% - 880px);max-height:270px;padding:12px 14px;display:block;top:90px;left:50%;right:auto;transform:translate(-50%)}.variables-panel .legend-hint,.variables-panel .plane-key,.variables-panel .quantity-visual small{display:none}.variables-panel .legend-quantities{gap:10px;padding:6px 2px;display:flex;overflow-x:auto}.variables-panel .legend-quantity{border-top-color:#0000;flex:1 0 145px;min-width:0;margin:0;padding:8px}.variables-panel .quantity-title{flex-direction:column;align-items:flex-start;gap:3px;display:flex}.variables-panel .quantity-title output{text-align:left;min-width:0;margin-left:0}.variables-panel .quantity-visual{justify-content:center}.variables-panel .legend-extra{margin:0;font-size:13px}.variables-panel .legend-extra dl{grid-template-columns:repeat(2,minmax(0,1fr));gap:0 16px;display:grid}@media (max-width:1200px){.inspector-panels .variables-panel,.inspector-panels.both-open .variables-panel{width:min(520px,100% - 400px);max-height:210px;top:88px;left:20px;transform:none}.course-app:has(.variables-panel) .lesson-panel{top:315px}}@media (max-width:760px){.inspector-panels .variables-panel,.inspector-panels.both-open .variables-panel{width:auto;max-height:185px;top:118px;left:12px;right:12px}.variables-panel .legend-quantity{flex-basis:140px}.variables-panel .quantity-visual svg{height:55px}.inspector-panels .parameters-panel{max-height:calc(50dvh - 135px);top:313px}.course-app:has(.variables-panel) .lesson-panel{top:auto}}.variables-panel .quantity-name{white-space:nowrap}.variables-panel .quantity-visual svg{height:64px}.variables-panel .quantity-title{line-height:1.5}.variables-panel .legend-quantity{padding:5px 6px}.variables-panel .legend-quantities{padding-bottom:0}.inspector-panels .variables-panel,.inspector-panels.both-open .variables-panel{anchor-name:--variables-bar;width:min(900px,100% - 790px);max-height:160px;left:calc(50% + 35px)}.variables-panel .legend-quantities{gap:6px}.variables-panel .legend-quantity{flex:1 0 185px;justify-content:space-between;align-items:center;gap:4px;padding:5px 4px;display:flex}.variables-panel .quantity-visual{flex:0 0 60px}.variables-panel .quantity-visual>div{display:none}.variables-panel .quantity-title{flex:1;gap:2px;min-width:0}.variables-panel .legend-heading{gap:10px}.live-values-trigger{color:#a9bec9;background:0 0;align-items:center;gap:4px;margin-left:auto;padding:2px 0;font-size:13px;display:flex}.live-values-trigger:hover{color:#cee7a8}.live-values-popover{position-anchor:--variables-bar;top:anchor(top);left:calc(anchor(right) + 12px);color:#e7eeef;position-try-fallbacks:flip-inline;background:#10212b;border:1px solid #38505b;border-radius:12px;width:300px;max-height:calc(100dvh - 150px);margin:0;padding:16px;font:16px Arial,Helvetica,sans-serif;position:fixed;overflow:auto;box-shadow:0 12px 40px #0006}.live-values-popover::backdrop{background:0 0}.live-values-popover dl{margin:14px 0 0}.live-values-popover dl>div{border-top:1px solid #ffffff12;justify-content:space-between;gap:14px;padding:8px 0;display:flex}.live-values-popover dd{text-align:right;white-space:nowrap;margin:0;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:14px}@media (max-width:1200px){.inspector-panels .variables-panel,.inspector-panels.both-open .variables-panel{width:min(650px,100% - 380px);left:20px}.course-app:has(.variables-panel) .lesson-panel{top:235px}}@media (max-width:760px){.inspector-panels .variables-panel,.inspector-panels.both-open .variables-panel{width:auto;left:12px;right:12px}.live-values-popover{position-anchor:auto;width:min(300px,100vw - 24px);top:245px;left:auto;right:12px}.course-app:has(.variables-panel) .lesson-panel{top:auto}.inspector-panels .parameters-panel{top:255px}}.variables-panel .legend-quantity:hover{border-color:#58717c}.variables-panel .legend-quantity[aria-pressed=true]{border-color:#e8dda0;border-radius:9px;box-shadow:inset 0 0 0 .5px #e8dda033}.variables-panel .legend-quantities{padding:4px 2px 2px}.variables-panel .legend-quantity{flex-basis:215px;gap:10px;padding:6px 12px}.variables-panel .quantity-visual{flex-basis:112px}.variables-panel .quantity-visual svg{width:112px;height:88px}.inspector-panels .variables-panel,.inspector-panels.both-open .variables-panel{max-height:180px}@media (min-width:1201px){.inspector-panels .variables-panel,.inspector-panels.both-open .variables-panel{width:min(900px,100% - 900px);top:23px;left:calc(50% + 35px)}}.parameter-guides-toggle{color:#bbccd6;background:0 0;border:1px solid #47606e;border-radius:7px;width:100%;margin-top:14px;padding:8px 12px;font-size:14px}.parameter-guides-toggle[aria-pressed=true]{color:#cee7a8;background:#cee7a810;border-color:#cee7a8}.parameter-guides-toggle:disabled{opacity:.4}.editing-parameter,.selected-parameter{outline:1px solid var(--parameter-color,#b5c8d4);outline-offset:6px;border-radius:4px}.parameter-guide{filter:none;z-index:1}.parameter-guide.active-parameter-guide{filter:drop-shadow(0 0 3px color-mix(in srgb,var(--highlight-color,#fff3a0) 38%,transparent));z-index:2}.lab-screen-overlay.spacecraft-marker-overlay{z-index:7}.lab-world-label.spacecraft-label{z-index:8}.parameters-panel .reset-orbit-parameters{color:#cee7a8;cursor:pointer;background:0 0;border:1px solid #607254;border-radius:7px;justify-content:center;align-items:center;gap:8px;width:100%;height:36px;margin:12px 0 4px;font-size:14px;display:flex}.parameters-panel .reset-orbit-parameters:hover:not(:disabled){background:#cee7a812;border-color:#cee7a8}.parameters-panel .reset-orbit-parameters:disabled{color:#82949f;cursor:default;opacity:.6;border-color:#344955}.parameters-panel .reset-orbit-parameters:focus-visible{outline-offset:2px;outline:2px solid #cee7a8}.study-camera-switch{background:#10212b;border:1px solid #344955;border-radius:9px;gap:2px;padding:3px;display:flex}.lab-tools .study-camera-switch button{white-space:nowrap}.lab-tools{flex-wrap:wrap;justify-content:center}.lesson-navigation .next-lesson-arrow{color:#c0cdd4;background:0 0;border-radius:6px;justify-content:center;align-items:center;padding:7px;display:flex}.lesson-navigation>button:first-child:hover:not(:disabled),.lesson-navigation .next-lesson-arrow:hover:not(:disabled){background:#273b47}.lesson-navigation>button:focus-visible{outline-offset:2px;outline:2px solid #cee7a8}.course-transport .playback-speed-trigger{anchor-name:--playback-speed;color:#dce7eb;white-space:nowrap;background:#243844;border-radius:6px;align-items:center;gap:6px;padding:8px;font-size:13px;display:flex}.playback-speed-menu{position-anchor:--playback-speed;inset:auto;bottom:calc(anchor(top) + 8px);right:anchor(right);color:#e7eeef;background:#172a35;border:1px solid #38505b;border-radius:10px;min-width:160px;margin:0;padding:6px;font:14px Arial,Helvetica,sans-serif;position:fixed;box-shadow:0 8px 30px #0006}.playback-speed-menu button{width:100%;color:inherit;background:0 0;border-radius:5px;justify-content:space-between;align-items:center;gap:24px;padding:9px 12px;display:flex}.playback-speed-menu button:hover,.playback-speed-menu button:focus-visible{background:#2a424e}.playback-speed-menu button[aria-pressed=true]{color:#cee7a8;background:#cee7a812}.playback-speed-menu kbd{color:#94aab6;font:12px ui-monospace,monospace}@media (min-width:761px){.inspector-panels .parameters-panel{width:390px}}@media (min-width:1600px){.inspector-panels .parameters-panel{width:430px}}@media (min-width:761px) and (max-width:1100px){.inspector-panels .parameters-panel{width:330px}}@media (min-width:761px) and (max-width:1200px){.inspector-panels .variables-panel,.inspector-panels.both-open .variables-panel{width:min(650px,100% - 450px)}}@media (max-width:760px){.inspector-panels .parameters-panel{width:auto;left:12px;right:12px}}.display-equation{overflow-wrap:normal;padding:5px 0;line-height:1.8;overflow-x:auto}.equation-fraction{vertical-align:middle;text-align:center;flex-direction:column;align-items:stretch;margin:0 .15em;line-height:1.45;display:inline-flex}.equation-numerator,.equation-denominator{white-space:nowrap;padding:.08em .2em;display:block}.equation-numerator{border-bottom:1px solid}.equation-fraction .equation-fraction{font-size:.85em}.equation-root{vertical-align:middle;white-space:nowrap;align-items:stretch;margin:0 .08em;display:inline-flex}.equation-root-sign{align-self:stretch;align-items:center;font-size:1.35em;line-height:1;display:flex}.equation-radicand{border-top:1px solid;padding:0 .12em}.equation-script{white-space:nowrap;display:inline-block}.equation-script sup,.equation-script sub{vertical-align:baseline;font-size:.7em;line-height:1;position:relative}.equation-script sup{top:-.65em}.equation-script sub{bottom:-.3em}@media (min-width:761px){.course-app{--controls-bottom:42px}.playback-dock{bottom:var(--controls-bottom)}.lesson-panel,.inspector-panels .parameters-panel{bottom:var(--controls-bottom);max-height:none}}.answer-option.incorrect{color:#f3d5d5;background:#482b30;border-color:#ce8585}.answer-feedback.incorrect{background:#482b308c;border:1px solid #975b65}.answer-feedback.incorrect strong{color:#f3b4b4}.answer-feedback.incorrect p{color:#e3c5ca}.answer-feedback.correct{border:1px solid #617d60}.answer-feedback.correct strong{color:#cee7a8}.lesson-tabs button{font-size:14px}.answer-option{font-size:16px}@media (max-width:760px){.lesson-tabs button{font-size:13px}}.lab-presets button[aria-pressed=true]{color:#e0edcf;background:#344b3b;box-shadow:inset 0 0 0 1px #94af7d}.course-app{--variables-left:12px;--variables-right:12px}.inspector-panels .variables-panel,.inspector-panels.both-open .variables-panel{left:calc(var(--variables-left) + (100% - var(--variables-left) - var(--variables-right))/2);width:max-content;max-width:calc(100% - var(--variables-left) - var(--variables-right));box-sizing:border-box;right:auto;transform:translate(-50%)}.variables-panel .legend-quantity{flex:none;width:max-content;min-width:215px}@media (min-width:761px){.course-app{--variables-left:20px;--variables-right:434px}.course-app:not(:has(.parameters-panel)){--variables-right:28px}}@media (min-width:761px) and (max-width:1100px){.course-app:has(.parameters-panel){--variables-right:374px}}@media (min-width:1201px){.course-app{--variables-left:434px}.course-app:not(:has(.lesson-panel)){--variables-left:28px}}@media (min-width:1600px){.course-app:has(.lesson-panel){--variables-left:474px}.course-app:has(.parameters-panel){--variables-right:474px}}.course-header{pointer-events:none}.course-header>a,.course-header>nav{pointer-events:auto}.inspector-switches button{align-items:center;gap:8px;display:flex}@media (min-width:761px){.inspector-panels .parameters-panel{top:90px}}@media (min-width:761px) and (max-width:1200px){.course-app:has(.variables-panel) .inspector-panels .parameters-panel{top:235px}}.inspector-switches.variables-collapsed{top:23px;left:calc(var(--variables-left) + (100% - var(--variables-left) - var(--variables-right))/2);right:auto;transform:translate(-50%)}@media (max-width:1200px){.inspector-switches.variables-collapsed{top:88px}}@media (max-width:760px){.inspector-switches.variables-collapsed{top:118px}}.course-scene{isolation:isolate;z-index:0}.playback-dock .lab-tools{scrollbar-width:thin;flex-wrap:nowrap;justify-content:flex-start;max-width:calc(100vw - 24px);overflow-x:auto}.playback-dock .lab-tools>*,.playback-dock .lab-tools button{white-space:nowrap;flex-shrink:0}.inline-equation{vertical-align:baseline;white-space:nowrap;display:inline-block}
