:root{color:#102044;font-synthesis:none;--blue:#1767e8;--line:#d8e2ef;--muted:#526783;--pale:#f3f8fe;background:#fff;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit}button,a,input{-webkit-tap-highlight-color:transparent}button,.button{cursor:pointer;border:1px solid var(--line);color:inherit;background:#fff;border-radius:9px;justify-content:center;align-items:center;gap:7px;padding:11px 16px;font-size:14px;font-weight:550;line-height:1.4;text-decoration:none;display:inline-flex}button:hover,.button:hover{background:#eff5ff}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible,.scene:focus-visible{outline-offset:3px;outline:3px solid #ec9e3b}button[aria-pressed=true],.primary{background:var(--blue);border-color:var(--blue);color:#fff}button[aria-pressed=true]:hover,.primary:hover{background:#1156c5}.wide{width:100%;padding:14px;font-weight:650}button:disabled{color:#64748b;cursor:default;background:#e8eef7;border-color:#e8eef7}a{color:#1557b0}p{line-height:1.6}h1,h2,h3{line-height:1.25}h1{letter-spacing:-1.1px;margin:0 0 10px;font-size:clamp(27px,2.7vw,42px);font-weight:740}h2{letter-spacing:-.5px;margin:0 0 14px;font-size:23px}h3{margin:0 0 8px;font-size:19px}.site-header{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:22px;min-height:80px;padding:0 34px;display:flex}.brand{color:inherit;white-space:nowrap;align-items:center;gap:10px;font-size:22px;font-weight:730;text-decoration:none;display:flex}.brand svg{stroke:#1c4682;stroke-width:1.3px;fill:none;width:35px;height:35px}.brand svg path{fill:var(--blue);stroke:var(--blue)}nav{align-self:stretch;align-items:center;gap:25px;display:flex}nav a{color:var(--muted);border-bottom:3px solid #0000;padding:29px 0 26px;font-size:14px;font-weight:550;text-decoration:none}nav a[aria-current=page]{color:var(--blue);border-color:var(--blue)}.account-link{color:var(--muted);white-space:nowrap;font-size:13px;text-decoration:none}main{max-width:1600px;min-height:calc(100vh - 135px);margin:auto;padding:28px 28px 40px}.page-heading{justify-content:space-between;align-items:center;gap:15px;display:flex}.breadcrumb{color:var(--muted);gap:10px;margin-bottom:16px;font-size:12px;display:flex}.breadcrumb a{color:var(--muted);text-decoration:none}.subtitle{color:var(--muted);margin:0 0 25px;font-size:17px;line-height:1.5}.fixture-notice{color:#4a5f7c;background:#f8fbff;border:1px solid #dce6f3;border-radius:7px;justify-content:space-between;gap:16px;margin:0 0 20px;padding:9px 13px;font-size:12px;line-height:1.5;display:flex}.fixture-notice a{white-space:nowrap}.workspace{grid-template-columns:minmax(0,1.8fr) minmax(340px,1fr);gap:20px;display:grid}.viewer{border:1px solid var(--line);background:var(--pale);border-radius:13px;flex-direction:column;min-width:0;min-height:610px;display:flex;position:relative;overflow:hidden}.toolbar{z-index:1;justify-content:space-between;gap:10px;padding:18px 18px 0;display:flex}.view-tabs{gap:8px;display:flex}.quiet{background:#ffffffda;font-size:13px}.scene{touch-action:pan-y pinch-zoom;flex:1;height:480px;min-height:380px;position:relative;outline-offset:-4px!important}.scene canvas{width:100%;height:100%;display:block}.model-label{z-index:1;pointer-events:none;white-space:nowrap;color:#1455b1;background:#fff;border:1px solid #2b73d6;border-radius:7px;padding:8px 11px;font-size:14px;font-weight:700;position:absolute;transform:translate(-50%,-50%);box-shadow:0 3px 12px #10387410}.chart-stage{flex:1;justify-content:center;align-items:center;height:480px;min-height:380px;padding:20px;display:flex;overflow:hidden}.chart-stage img{object-fit:contain;width:100%;height:100%;max-height:520px}.viewer-bottom{justify-content:space-between;align-items:center;gap:12px;padding:8px 18px 4px;display:flex}.viewer-bottom>span{color:var(--muted);max-width:65%;font-size:11px}.model-note{color:#5e6f86;text-align:center;margin:12px 0 15px;padding:0 15px;font-size:11px}.accessible-note{color:var(--muted);background:#f9fbfe;border-top:1px solid #dce6f3;padding:12px 18px;font-size:12px}summary{cursor:pointer;width:fit-content;font-weight:600}aside{flex-direction:column;gap:16px;min-width:0;display:flex}.lesson-panel,.reference-panel{border:1px solid var(--line);background:#fff;border-radius:13px;padding:24px}.lesson-panel{flex-direction:column;flex:1;min-height:430px;display:flex}.mode-tabs{align-items:center;gap:7px;margin-bottom:22px;font-size:12px;display:flex}.mode-tabs a{color:var(--muted);border-radius:7px;padding:7px 14px;text-decoration:none}.mode-tabs a[aria-current=page]{background:var(--blue);color:#fff}.panel-heading{justify-content:space-between;align-items:center;gap:12px;display:flex}.panel-heading h2{margin:0;font-size:22px}.panel-heading>span{white-space:nowrap;color:var(--muted);font-size:13px}.progress-track{background:#edf2f8;border-radius:5px;height:4px;margin:16px 0 22px;overflow:hidden}.progress-track>div{background:var(--blue);height:100%;transition:width .25s}.lesson-text{margin:0 0 20px;font-size:19px;line-height:1.5}.lesson-detail{margin:18px 0;font-size:14px;line-height:1.65}.lesson-graphic{color:#0f5cca;background:#f7faff;border-radius:8px;justify-content:center;align-items:center;gap:23px;height:112px;font-size:18px;line-height:1.55;display:flex}.height-box{border:3px dashed #2467ac;padding:0 8px;font-family:Georgia,serif;font-size:42px}.dashed-circle{border:3px dashed #1767e8;border-radius:50%;place-items:center;width:65px;height:65px;font-size:30px;display:grid}.shield{font-size:42px}.interaction-hint{color:var(--muted);margin-top:auto;padding-top:10px;font-size:12px}.muted{color:var(--muted)}fieldset{border:0;min-width:0;margin:0;padding:0}legend{margin:0 0 23px;padding:0;font-size:19px;line-height:1.45}.answers{gap:10px;margin-bottom:20px;display:grid}.answer{border:1px solid var(--line);cursor:pointer;border-radius:9px;align-items:center;gap:10px;min-height:59px;padding:14px;font-size:15px;line-height:1.45;display:flex}.answer:has(input:checked){border-color:var(--blue);background:#f0f6ff}.answer input{accent-color:var(--blue);flex-shrink:0;width:18px;height:18px;margin:0}.option-letter{color:var(--muted);font-size:12px}.answer.correct{background:#eef9f4;border-color:#339575}.answer.wrong{background:#fff5ef;border-color:#cd7856}.answer-mark{color:#207d60;margin-left:auto}.feedback{color:#25446c;background:#eff7ff;border-radius:8px;outline:none;margin-bottom:15px;padding:16px;font-size:14px;line-height:1.5}.feedback>strong{margin-bottom:5px;font-size:16px;display:block}.feedback p{margin:8px 0 12px}.feedback.positive{background:#eef9f4}.feedback details{margin:12px 0}.feedback details p strong{font-size:13px;display:block}.sources-inline{flex-wrap:wrap;gap:8px;font-size:12px;display:flex}.reference-panel{padding:22px 24px}.reference-panel h2{font-size:19px}.reference-panel p{color:var(--muted);margin:0;font-size:13px}.sources{color:var(--muted);margin:24px 0 0;font-size:13px;line-height:1.65}.sources p{max-width:970px}.save-status{color:#427462;text-align:center;margin:12px 0 0;font-size:11px}.save-error{background:#fff7ee;border:1px solid #d39a70;border-radius:8px;margin-top:14px;padding:14px;font-size:13px}.save-error p{margin:6px 0 12px}.button-row{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.spread{justify-content:space-between;margin:15px 0}.text-button{color:var(--muted);text-align:left;background:0 0;border:0;justify-content:flex-start;padding:8px 0;font-size:12px;text-decoration:none}.text-button:hover{color:var(--blue);background:0 0}.question-actions{flex-wrap:wrap;align-items:start;gap:20px;margin-top:15px;display:flex}.question-actions .report{flex:1}.report form{min-width:220px}.report textarea{min-height:90px}.report form label{font-size:12px}.study-context{border:1px solid var(--line);background:var(--pale);border-radius:13px;padding:40px}.study-context p{color:var(--muted);max-width:520px}.workspace.without-media{grid-template-columns:1fr 1.3fr;max-width:1220px;margin:auto}.mock-grid{grid-template-columns:repeat(6,1fr);gap:9px;margin:26px 0;display:grid}.mock-grid button{padding:12px 5px;position:relative}.mock-grid button.answered{background:#e5f4ec;border-color:#a9d2bd}.mock-grid button[aria-current=step]{border:2px solid var(--blue)}.mock-grid button span{font-size:11px;position:absolute;top:0;right:2px}.timer{letter-spacing:1px;font-variant-numeric:tabular-nums;border:1px solid var(--line);border-radius:8px;padding:15px;font-size:27px}.timer small{color:var(--muted);letter-spacing:0;text-align:center;font-size:11px;display:block}.chart-dialog{border:1px solid var(--line);color:#102044;border-radius:12px;width:min(900px,94vw);max-height:95vh;padding:20px}.chart-dialog::backdrop{background:#061b42b3}.dialog-toolbar{justify-content:space-between;align-items:center;gap:15px;margin-bottom:12px;display:flex}.dialog-toolbar h2{margin:0}.zoom-scroll{background:#f3f8fe;height:min(65vh,650px);overflow:auto}.zoom-scroll img{object-fit:contain;min-width:100%;display:block}.course-intro{border:1px solid var(--line);background:var(--pale);border-radius:12px;justify-content:space-between;align-items:center;gap:25px;margin:15px 0 38px;padding:30px;display:flex}.course-intro h2{margin:0}.course-intro p{margin:10px 0 0;font-size:15px}.module{margin-top:35px}.lesson-list,.bank-list,.history-list{border-top:1px solid var(--line)}.lesson-row,.bank-row,.history-row,.form-row{border-bottom:1px solid var(--line);color:inherit;align-items:center;gap:22px;padding:25px 16px;text-decoration:none;display:flex}.lesson-row:hover{background:#f7faff}.lesson-row>div,.bank-row>div,.form-row>div{flex:1}.lesson-row p{color:var(--muted);max-width:860px;margin:0 0 10px;font-size:14px}.step-number{color:#8297b4;font-variant-numeric:tabular-nums;flex-shrink:0;font-size:17px}small{color:var(--muted);font-size:12px}.setup-layout{grid-template-columns:1.6fr 1fr;gap:40px;max-width:1180px;display:grid}.selection-list{border-top:1px solid var(--line);flex-direction:column;display:flex}.selection{border-bottom:1px solid var(--line);cursor:pointer;gap:18px;padding:23px 17px;display:flex}.selection h2{margin:0 0 7px;font-size:19px}.selection p{color:var(--muted);margin:0;font-size:14px}.selection input{accent-color:var(--blue);width:18px}.selection.selected{background:#f3f8fe}.setup-panel{border:1px solid var(--line);border-radius:12px;align-self:start;gap:10px;padding:27px}.setup-panel p{font-size:14px}.setup-panel label,label{font-size:13px;font-weight:550}input[type=search],input[type=email],input[type=text],select,textarea{border:1px solid var(--line);color:#102044;background:#fff;border-radius:8px;width:100%;margin-top:8px;padding:12px;font-size:14px;display:block}select{min-width:0}textarea{resize:vertical}.bank-filters{border-top:1px solid var(--line);border-bottom:1px solid var(--line);align-items:end;gap:18px;padding:22px 0;display:flex}.search-field{flex:1.5}.bank-filters>label:not(.checkbox-label){flex:1;min-width:130px}.bank-filters>label:first-child{flex:1.7}.checkbox-label{align-items:center;gap:8px;padding-bottom:13px;display:flex}.checkbox-label input{accent-color:var(--blue)}.result-count{color:var(--muted);margin:22px 0 14px;font-size:13px}.bank-row p{margin:0 0 8px;font-size:16px}.bank-row small{font-size:11px}.bank-row>button{flex-shrink:0}.mock-intro{max-width:780px;margin:10px 0 25px}.mock-intro p{color:var(--muted);font-size:15px}.form-list{border:1px solid var(--line);border-radius:12px;overflow:hidden}.form-row{background:#f8fbff;border-bottom:0}.form-row h2{margin:0;font-size:21px}.form-row p{color:var(--muted);font-size:14px}.history-row{justify-content:space-between;font-size:14px}.progress-metrics{border-top:1px solid var(--line);grid-template-columns:repeat(4,1fr);gap:30px;padding:30px 0 42px;display:grid}.progress-metrics strong{letter-spacing:-1px;font-size:39px}.progress-metrics strong span{color:#7b8da9;font-size:21px}.progress-metrics p{color:var(--muted);margin:10px 0 0;font-size:13px}.skill-table{border-collapse:collapse;border-top:1px solid var(--line);text-align:left;width:100%;margin-top:20px;font-size:14px}.skill-table th,.skill-table td{border-bottom:1px solid var(--line);padding:20px 8px;font-weight:400}.skill-table th:first-child{width:40%}.skill-table-head{color:var(--muted);font-size:12px}.mobile-cell-label{display:none}.empty-state{text-align:center;padding:60px 20px}.empty-state p{color:var(--muted)}.loading-state{min-height:350px;color:var(--muted);text-align:center;place-content:center;display:grid}.auth-panel{border:1px solid var(--line);border-radius:13px;max-width:460px;margin:30px auto 70px;padding:34px}.auth-panel h1{font-size:29px}.auth-panel p{color:var(--muted);font-size:14px}.auth-panel .button,.auth-panel>button{margin:12px 0}.auth-divider{text-align:center;color:var(--muted);margin:18px 0;font-size:12px}.auth-panel form{gap:16px;display:grid}.account-grid{grid-template-columns:1.2fr 1fr;gap:35px;max-width:1140px;display:grid}.account-panel{border:1px solid var(--line);border-radius:12px;padding:30px}.account-panel p{color:var(--muted);font-size:14px}.price{letter-spacing:-1px;font-size:46px;font-weight:700}.price small{letter-spacing:0;font-size:17px;font-weight:400}footer{text-align:center;color:var(--muted);padding:18px 20px 24px;font-size:11px}.skip{z-index:100;background:#fff;padding:15px;position:fixed;top:-100px;left:20px}.skip:focus{top:10px}.sr-only{clip:rect(0,0,0,0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}[hidden]{display:none!important}@media (min-width:1450px){.scene,.chart-stage{height:560px}.viewer{min-height:710px}.lesson-panel{padding:30px}.lesson-text,legend{font-size:21px}}@media (max-width:1100px){.site-header{gap:15px;padding:0 22px}nav{gap:16px}.brand{font-size:19px}.account-link{font-size:12px}.workspace{grid-template-columns:minmax(0,1.5fr) minmax(310px,1fr)}.lesson-panel{padding:21px}.bank-filters{flex-wrap:wrap}.bank-filters .checkbox-label{flex-basis:100%;padding-bottom:0}.mock-grid{grid-template-columns:repeat(5,1fr)}}@media (max-width:900px){.site-header{flex-wrap:wrap;gap:4px 20px;padding-top:15px}.brand{margin-right:auto}.site-header nav{order:3;justify-content:center;gap:30px;width:100%;overflow-x:auto}.site-header nav a{white-space:nowrap;padding:17px 0 13px}.account-link{margin-left:auto}main{padding:24px 18px 30px}.workspace,.workspace.without-media{grid-template-columns:minmax(0,1fr)}.viewer{min-height:490px}.scene,.chart-stage{flex:none;height:390px;min-height:320px}.lesson-panel{min-height:0}.reference-panel{display:none}.subtitle{font-size:15px}.setup-layout{grid-template-columns:1.3fr 1fr;gap:22px}.fixture-notice{display:block}.fixture-notice a{white-space:normal;margin-top:5px;display:block}.study-context{padding:25px}.mock-grid{grid-template-columns:repeat(8,1fr);max-width:600px}.progress-metrics{gap:20px}.skill-table{font-size:13px}.bank-row{gap:14px}.bank-row>button:last-child{font-size:12px}.account-grid{gap:20px}}@media (max-width:600px){.site-header{gap:10px;padding:14px 14px 0}.brand{gap:6px;font-size:18px}.brand svg{width:28px;height:28px}.site-header nav{justify-content:space-between;gap:17px}.site-header nav a{padding-top:11px;font-size:12px}.account-link{font-size:11px}.account-link span{display:none}main{padding:20px 12px 24px}h1{letter-spacing:-.7px;font-size:29px}.subtitle{margin-bottom:18px}.breadcrumb{margin-bottom:12px;font-size:11px}.toolbar{gap:6px;padding:12px 10px 0}.toolbar button{padding:9px 10px;font-size:12px}.view-tabs{gap:5px}.viewer{min-height:430px}.scene,.chart-stage{height:310px;min-height:310px}.viewer-bottom{gap:8px;padding:6px 10px}.viewer-bottom button{padding:9px;font-size:11px}.model-note{margin:10px 0;font-size:10px}.lesson-panel{padding:20px}.panel-heading h2{font-size:21px}.model-label{padding:6px 8px;font-size:12px}.accessible-note{padding:12px;font-size:11px}.course-intro{flex-direction:column;align-items:stretch;margin-bottom:28px;padding:23px}.course-intro h2{font-size:22px}.lesson-row{gap:14px;padding:22px 8px}.lesson-row p{font-size:13px}.setup-layout,.account-grid{grid-template-columns:1fr}.setup-panel{padding:22px}.selection{padding:20px 12px}.bank-filters{gap:16px}.bank-filters>label:first-child{flex-basis:100%}.bank-row{flex-wrap:wrap;gap:12px;padding:22px 8px}.bank-row>div{flex-basis:calc(100% - 40px)}.bank-row>button:nth-last-child(2){margin-left:30px}.bank-row>button:last-child{margin-left:auto}.bank-row p{font-size:15px}.form-row{flex-direction:column;align-items:stretch;padding:23px}.form-row h2{font-size:20px}.mock-grid{grid-template-columns:repeat(6,1fr)}.progress-metrics{grid-template-columns:1fr 1fr;padding:25px 0}.progress-metrics strong{font-size:34px}.history-row{gap:10px;padding:20px 8px;font-size:12px}.chart-dialog{padding:12px}.dialog-toolbar{flex-wrap:wrap}.dialog-toolbar h2{font-size:20px}.auth-panel{margin:10px auto 30px;padding:25px}.fixture-notice{font-size:11px}.timer{padding:10px;font-size:20px}.page-heading:has(.timer){align-items:start}.timer small{font-size:10px}.account-panel{padding:23px}footer{font-size:10px}}@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;animation:none!important}}.chart-stage>svg,.zoom-scroll svg,.zoom-scroll img{width:100%;height:auto;display:block}.mock-session-bar{border-block:1px solid var(--line);flex-wrap:wrap;align-items:center;gap:24px;margin:24px 0;padding:24px 0;display:flex}.mock-session-bar .mock-grid{flex:1;min-width:200px}.mock-results{margin:28px 0}.mock-results table{border-collapse:collapse;text-align:left;width:100%;max-width:700px}.mock-results th,.mock-results td{border-bottom:1px solid var(--line);padding:12px}.mock-results caption{text-align:left;padding:12px 0}.lesson-panel .viewer{min-width:0;margin:20px 0}.lesson-panel .chart-stage{min-height:180px}.lesson-panel .viewer-bottom{flex-wrap:wrap}.viewer video{width:100%;height:auto}.viewer figcaption{padding:20px}.workspace{grid-template-rows:auto 1fr;gap:0 20px}.task-intro{border:1px solid var(--line);outline-offset:3px;background:#fff;border-bottom:0;border-radius:13px 13px 0 0;grid-area:1/2;min-width:0;padding:24px 24px 0;scroll-margin-top:12px}.workspace>.viewer,.workspace>.study-context{grid-area:1/1/span 2;align-self:start}.workspace>aside{grid-area:2/2;align-self:start}.workspace>aside>.lesson-panel{border-top:0;border-radius:0 0 13px 13px;min-height:0;padding-top:0}.question-prompt{margin:0 0 23px;font-size:19px;line-height:1.45}.scene.is-interactive{touch-action:none}.viewer button,.chart-dialog button,.account-link{min-width:44px;min-height:44px}.account-link{justify-content:center;align-items:center;display:inline-flex}.accessible-note{padding:0 18px}.accessible-note summary{min-height:44px;padding:12px 0;line-height:20px}.interaction-controls{color:var(--muted);margin:8px 0 12px;padding:0 18px;font-size:12px;line-height:1.5}.workspace .viewer{min-height:0}.workspace .scene{aspect-ratio:5/4;flex:none;height:auto;min-height:0}.workspace .chart-stage{flex:none;height:auto;min-height:0;padding:0;display:block}.workspace .chart-stage>img,.workspace .chart-stage>svg{object-fit:contain;width:100%;height:auto;max-height:none;display:block}.workspace .chart-stage>p{padding:18px}.workspace .toolbar{padding-bottom:12px}.chart-dialog{width:min(900px,94vw);max-width:100vw;height:min(860px,94dvh);max-height:94dvh;padding:20px}.chart-dialog[open]{flex-direction:column;gap:12px;display:flex}.chart-dialog .dialog-toolbar{flex-wrap:nowrap;margin:0}.zoom-controls{align-items:center;gap:10px;display:flex}.zoom-controls output{text-align:center;font-variant-numeric:tabular-nums;width:52px;font-size:14px}.zoom-controls button:last-child{margin-left:auto}.zoom-scroll{background:var(--pale);touch-action:none;overscroll-behavior:contain;cursor:grab;-webkit-user-select:none;user-select:none;border-radius:5px;flex:1;height:auto;min-height:0;display:flex;position:relative;overflow:auto}.zoom-scroll:active{cursor:grabbing}.zoom-canvas{flex-shrink:0;margin:auto;position:relative}.zoom-canvas img,.zoom-canvas svg{pointer-events:none;width:100%;max-width:none;height:100%;display:block}.zoom-help{color:var(--muted);text-align:center;margin:0;font-size:12px;line-height:1.5}.resume-card{gap:24px;margin-bottom:0}.resume-thumbnail{object-fit:cover;border:1px solid var(--line);border-radius:8px;width:112px;height:112px}.resume-description{flex:1;min-width:0}.resume-card .resume-label{color:var(--muted);margin:0 0 8px;font-size:13px}.resume-card h2{font-size:25px}.resume-card progress{width:100%;max-width:330px;height:5px;accent-color:var(--blue);background:#dbe5f2;border:0;border-radius:5px;margin-top:16px;display:block;overflow:hidden}.resume-card progress::-webkit-progress-bar{background:#dbe5f2}.resume-card progress::-webkit-progress-value{background:var(--blue)}.learn-status{color:var(--muted);justify-content:space-between;align-items:center;gap:16px;padding:12px 2px;font-size:13px;display:flex}.learn-status p{margin:0}.learn-status a{align-items:center;min-height:44px;display:inline-flex}.selection-summary{color:var(--muted);margin:0 0 8px}@media (min-width:1450px){.task-intro{padding:30px 30px 0}.question-prompt{font-size:21px}}@media (max-width:1100px){.task-intro{padding:21px 21px 0}}@media (max-width:900px){.workspace,.workspace.without-media{grid-template-rows:auto;gap:0}.task-intro{grid-area:auto/1;padding:18px 18px 0}.workspace>.viewer{border-top:0;border-bottom:0;border-radius:0;grid-area:auto/1;min-height:0}.workspace>.study-context{display:none}.workspace>aside{grid-area:auto/1}.workspace>aside>.lesson-panel{border-top:1px solid var(--line);padding:16px 18px}.workspace.without-media>aside>.lesson-panel{border-top:0;padding-top:0}.task-intro .progress-track{margin:12px 0}.task-intro .lesson-text,.question-prompt{margin-bottom:16px;font-size:17px}.lesson-graphic{display:none}.lesson-detail{margin:0 0 10px}.interaction-hint{margin:8px 0 12px;padding-top:0}.study-heading h1{margin-bottom:5px;font-size:25px}.study-heading .subtitle{margin-bottom:12px;font-size:13px}.study-heading .breadcrumb{margin-bottom:4px}.study-heading .breadcrumb a{align-items:center;min-height:44px;display:inline-flex}}@media (max-width:600px){.site-header{gap:4px 10px;padding-top:6px}.site-header nav{gap:8px}.site-header nav a{text-align:center;min-width:44px;min-height:44px;padding:12px 0}.account-link{font-size:12px}.brand{min-height:44px}.study-heading h1{letter-spacing:-.4px;font-size:23px}.study-heading .subtitle{font-size:12px}.study-heading+.fixture-notice{margin-bottom:14px;font-size:11px}.task-intro{padding:16px 16px 0}.task-intro .panel-heading h2{font-size:18px}.task-intro .lesson-text,.question-prompt{margin-bottom:12px;font-size:16px;line-height:1.5}.workspace .toolbar{padding:8px 10px}.workspace .viewer-bottom{padding:4px 10px 8px}.workspace .accessible-note{padding:0 12px;font-size:12px}.workspace .accessible-note summary{padding:12px 0}.workspace>aside>.lesson-panel{padding:14px 16px}.lesson-detail{font-size:14px;line-height:1.5}.answer{min-height:52px;padding:12px;font-size:14px}.answers{gap:8px;margin-bottom:14px}.text-button{min-height:44px}.chart-dialog{width:100vw;height:100dvh;max-height:100dvh;padding:12px;padding-top:max(12px,env(safe-area-inset-top));padding-bottom:max(12px,env(safe-area-inset-bottom));border:0;border-radius:0;margin:0}.chart-dialog .dialog-toolbar h2{font-size:20px}.resume-card{grid-template-columns:64px minmax(0,1fr);gap:16px;padding:20px;display:grid}.resume-thumbnail{align-self:start;width:64px;height:70px;margin-top:24px}.resume-description{grid-column:2}.resume-card:not(:has(.resume-thumbnail)) .resume-description{grid-column:1/-1}.resume-card h2{font-size:21px}.resume-card p{font-size:13px;line-height:1.5}.resume-card>.button{grid-column:1/-1;min-height:48px}.learn-status{flex-wrap:wrap;gap:4px;font-size:12px}.skill-table,.skill-table tbody{display:block}.skill-table-head{clip:rect(0,0,0,0);width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.skill-table-row{border-bottom:1px solid var(--line);padding:18px 8px;display:block}.skill-table th:first-child{width:auto}.skill-table tbody th{border:0;padding:0 0 12px;font-size:16px;font-weight:600;display:block}.skill-table td{border:0;grid-template-columns:90px minmax(0,1fr);gap:14px;padding:6px 0;font-size:14px;display:grid}.mobile-cell-label{color:var(--muted);font-size:12px;display:block}}.interactive-lessons{margin:18px 0 30px}.interactive-lessons>h2{margin-bottom:16px;font-size:20px}.interactive-lesson-grid{grid-template-columns:repeat(3,1fr);gap:16px;display:grid}.interactive-lesson-grid>a{color:var(--ink);border:1px solid var(--line);background:linear-gradient(145deg,#f4f8ff,#fff 70%);border-radius:12px;flex-direction:column;padding:24px;text-decoration:none;display:flex}.interactive-lesson-grid h3{margin:12px 0;font-size:20px}.interactive-lesson-grid p{color:var(--muted);flex:1;margin-top:0;font-size:14px;line-height:1.6}.text-link{color:#2563eb;font-size:13px;font-weight:650}.eyebrow{letter-spacing:.1em;text-transform:uppercase;color:#466a99;font-size:11px;font-weight:650}.model-badge{color:#315d9c;background:#eaf2ff;border-radius:20px;margin-left:10px;padding:3px 8px;font-size:10px;display:inline-block}.packaged-scene{min-height:0!important;display:block!important}.packaged-scene iframe{border:0;width:100%;display:block}.model-status{background:#f2f6fd;padding:14px 18px;font-size:13px}.simulation,.chart-explorer{overflow:hidden;min-height:0!important;display:block!important}.simulation-heading{padding:22px 22px 14px}.simulation-heading h2{margin:7px 0 10px;font-size:23px}.simulation-heading p{color:#52647d;margin:0;font-size:13px;line-height:1.6}.simulation-stages{flex-wrap:wrap;gap:6px;padding:0 18px 15px;display:flex}.simulation-stages button{padding:9px 10px;font-size:12px}.simulation-stages button[aria-pressed=true]{color:#fff;background:#2563eb;border-color:#2563eb}.teaching-canvas{outline-offset:-3px;height:420px;position:relative}.teaching-canvas canvas{touch-action:inherit;width:100%;height:100%;display:block}.teaching-toolbar{border-bottom:1px solid var(--line);background:#f7f9fc;flex-wrap:wrap;padding:12px!important}.teaching-toolbar button{padding:8px;font-size:11px}.simulation-controls,.chart-activity{padding:22px}.simulation-controls>label{margin-bottom:7px;font-size:14px;font-weight:600;display:block}.simulation-controls label output{float:right;color:#235abb}.simulation-controls input[type=range]{accent-color:#2563eb;width:100%;min-height:38px}.range-labels{color:#52647d;justify-content:space-between;margin:-2px 0 18px;font-size:11px;display:flex}.simulation-controls p,.chart-activity p{font-size:13px;line-height:1.6}.model-assumption{color:#56657a;background:#f4f7fa;border-radius:6px;padding:12px;font-size:11px!important}.prediction-box{background:#f7f9fd;border:1px solid #d9e3f0;border-radius:9px;margin:20px 0;padding:16px}.prediction-box label,.chart-activity>label{font-size:14px;font-weight:600;line-height:1.5;display:block}.prediction-box textarea,.chart-activity textarea{box-sizing:border-box;resize:vertical;color:#142947;background:#fff;border:1px solid #bccadd;border-radius:6px;width:100%;min-height:76px;margin:10px 0 0;padding:10px;font:14px/1.5 inherit}.prediction-box .muted{font-size:11px}.simulation-result{background:#f3f8ff;border:1px solid #c5d9f5;border-left:3px solid #2563eb;border-radius:6px;margin:20px 0;padding:16px}.simulation-result h3{margin:0 0 10px;font-size:16px}.simulation-result table{border-collapse:collapse;width:100%;font-size:12px}.simulation-result td,.simulation-result th{text-align:left;border-bottom:1px solid #d6e0ed;padding:8px 3px}.simulation-result caption{text-align:left;padding:8px 0;font-size:12px}.simulation-fallback{background:#eef3f9;padding:26px;font-size:15px;line-height:1.6}.simulation-controls .button-row,.chart-activity .button-row{flex-wrap:wrap;margin-top:16px}.simulation-controls button,.chart-activity button{font-size:12px}.chart-task-select{padding:0 22px 12px;font-size:12px;display:block}.chart-task-select select{width:100%;margin-top:8px;display:block}.chart-tools{background:#f5f8fc;flex-wrap:wrap;align-items:center;display:flex;padding:10px 14px!important}.chart-tools output{min-width:34px;font-size:12px}.chart-tools button{padding:8px;font-size:12px}.chart-tools button[aria-pressed=true]{color:#174c91;background:#e4edff;border-color:#98b8ef}.chart-pan{overscroll-behavior-x:contain;outline-offset:-4px;touch-action:pan-x pan-y;background:#e8edf4;height:540px;position:relative;overflow:auto}.chart-sheet{cursor:crosshair;min-width:100%;line-height:0;position:relative}.chart-sheet img{-webkit-user-select:none;user-select:none;width:100%;max-width:none;height:auto;display:block}.chart-marks{pointer-events:none;width:100%;max-width:none;height:100%;position:absolute;inset:0}.chart-choices{border:0;margin:16px 0;padding:0}.chart-choices legend{margin-bottom:10px;font-size:14px;font-weight:650}.chart-choices label{border:1px solid #d7e0ec;border-radius:7px;align-items:center;gap:9px;margin:7px 0;padding:12px;font-size:13px;line-height:1.5;display:flex}.chart-choices input{accent-color:#2563eb}.chart-activity>.button-row{margin-top:18px}.packaged-scene .accessible-note,.simulation .accessible-note,.chart-explorer .accessible-note{border-top:1px solid var(--line);margin:0}@media (max-width:900px){.interactive-lesson-grid{gap:10px}.interactive-lesson-grid>a{padding:19px}.teaching-canvas{height:380px}.chart-pan{height:480px}}@media (max-width:600px){.interactive-lesson-grid{grid-template-columns:1fr}.interactive-lesson-grid>a{padding:20px}.interactive-lesson-grid h3{margin:9px 0;font-size:20px}.interactive-lesson-grid p{margin-bottom:12px}.simulation-heading{padding:18px 15px 12px}.simulation-heading h2{font-size:21px}.simulation-stages{padding:0 12px 12px}.simulation-controls,.chart-activity{padding:16px 13px}.teaching-canvas{height:330px}.chart-pan{height:410px}.chart-task-select{padding:0 15px 12px}.simulation-result{padding:12px}.prediction-box{padding:13px}.chart-choices label{font-size:12px}.simulation-controls .checkbox-label{align-items:center;gap:8px;display:flex}.simulation-controls .checkbox-label input{min-width:16px}}.skip:not(:focus){clip-path:inset(50%);width:1px;height:1px;padding:0;overflow:hidden}.lesson-full-instructions{color:#526783;margin:0 0 18px;font-size:13px}.lesson-full-instructions summary{min-height:36px}.lesson-full-instructions p{line-height:1.6}.workspace.reading-lesson{grid-template-columns:minmax(0,1fr);max-width:800px}.workspace.reading-lesson>.task-intro{grid-area:1/1}.workspace.reading-lesson>aside{grid-area:2/1}.prediction-activity{margin-bottom:24px}.prediction-activity label{margin:18px 0;display:block}.prediction-activity textarea{font-weight:400}.prediction-activity .worked-explanation{background:var(--pale);border-radius:8px;margin-top:20px;padding:18px}.prediction-activity .worked-explanation p{margin:0;line-height:1.65}.realistic-canvas{background:#e5ebf2;height:500px}.realistic-canvas.storm{height:520px}.realistic-canvas canvas{position:absolute;inset:0}.model-loading{z-index:1;text-align:center;color:#526783;width:100%;position:absolute;top:40%;left:0}.balance-modes{margin:0 0 16px}.balance-mode-note{background:#f5f8fc;border-left:3px solid #a7bcd5;padding:12px 14px;font-size:13px}@media (max-width:700px){.realistic-canvas{height:410px}.realistic-canvas.storm{height:440px}.balance-modes button{padding:9px;font-size:12px}}.workspace.original-lesson{grid-template-columns:minmax(0,1.85fr) minmax(340px,1fr);gap:0 24px;width:100%;max-width:none}.original-lesson .lesson-detail{margin:20px 0 30px;line-height:1.65}.original-lesson .lesson-graphic{margin:6px 0 22px}.original-lesson .viewer-bottom{flex-wrap:wrap;gap:8px}.original-lesson .scene{aspect-ratio:1.4!important}@media (max-width:900px){.workspace.original-lesson{grid-template-columns:minmax(0,1fr)}.original-lesson .scene{aspect-ratio:1.15!important}.original-lesson .lesson-detail{margin:16px 0 22px}}@media (min-width:901px){.original-study-heading{margin-bottom:14px}.original-study-heading+.fixture-notice{margin-bottom:18px;padding:7px 12px}.original-lesson .scene{aspect-ratio:1.7!important}}.guided-stage{background:#f6f9fc;min-width:0;overflow:hidden}.guided-stage-heading{background:#fff;padding:22px 24px 0}.guided-stage-heading h2{letter-spacing:-.3px;margin:0 0 6px;font-size:20px}.guided-stage-heading p{color:var(--muted);margin:0;font-size:14px;line-height:1.55}.guided-state-controls{border-bottom:1px solid var(--line);background:#fff;flex-wrap:wrap;gap:7px;padding:16px 24px;display:flex}.guided-state-controls button{border-radius:7px;flex:1;min-height:44px;padding:10px 14px;font-size:13px}.guided-state-controls button[aria-pressed=true],.guided-view-controls button[aria-pressed=true]{color:#124b99;background:#e5efff;border-color:#7caae8}.guided-model{background:#f3f7fb;place-items:center;min-width:0;height:440px;display:grid;position:relative;overflow:hidden}.guided-model canvas{width:100%;height:100%;display:block;position:absolute;inset:0}.guided-model-loading{z-index:1;background:#ffffffd9;border-radius:8px;padding:15px;font-size:14px}.guided-model-labels{pointer-events:none;position:absolute;inset:0;overflow:hidden}.guided-model-label{color:#243f63;text-align:center;white-space:normal;background:#fffe;border:1px solid #b5c9e1;border-radius:5px;max-width:175px;padding:6px 9px;font-size:12px;line-height:1.35;position:absolute;transform:translate(-50%,-100%);box-shadow:0 2px 9px #17355412}.guided-view-controls{border-top:1px solid var(--line);background:#fff;flex-wrap:wrap;align-items:center;gap:7px;padding:12px 20px;display:flex}.guided-view-controls>div{gap:5px;margin-right:auto;display:flex}.guided-view-controls button,.guided-equivalent button{min-height:40px;padding:7px 11px;font-size:12px}.guided-facts{border-top:1px solid var(--line);background:#fff;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:15px;margin:0;padding:18px 24px;display:grid}.guided-facts dt{color:var(--muted);margin-bottom:5px;font-size:12px;line-height:1.4}.guided-facts dd{letter-spacing:-.3px;overflow-wrap:anywhere;margin:0;font-size:21px;font-weight:650;line-height:1.3}.guided-equivalent{text-align:right;background:#fff;padding:0 20px}.guided-equivalent .quiet{color:var(--muted);background:0 0;border:0;text-decoration:underline}.guided-stage>.accessible-note{background:#fff;padding:0 24px;font-size:12px}.guided-stage>.accessible-note p{margin:0 0 18px;line-height:1.55}.guided-chapter{color:var(--muted);margin:0 0 14px;font-size:12px;line-height:1.5}.workspace.original-lesson.reading-lesson{grid-template-columns:minmax(0,1fr);max-width:900px}.lesson-update{background:#f0f6ff;border:1px solid #bfd3ee;border-radius:9px;justify-content:space-between;align-items:center;gap:15px;margin:0 0 20px;padding:14px 18px;display:flex}.lesson-update p{margin:0;font-size:14px}@media (max-width:600px){.lesson-update{flex-direction:column;align-items:stretch}}.guided-lesson .lesson-text{margin:0 0 24px;font-size:21px;line-height:1.55}.guided-lesson .panel-heading{align-items:start;gap:16px}.guided-lesson .panel-heading h2{font-size:25px;line-height:1.2}.guided-lesson .panel-heading>span{white-space:nowrap;font-size:12px}.guided-further{color:var(--muted);margin:0 0 24px;font-size:13px;line-height:1.65}.guided-further summary{cursor:pointer;min-height:44px;padding:10px 0}.guided-further p{margin:6px 0 12px}.guided-time-stage{flex-direction:column;justify-content:center;min-height:355px;padding:35px 40px 28px;display:flex}.guided-time-readout{flex-direction:column;gap:8px;display:flex}.guided-time-readout strong{letter-spacing:-.5px;font-size:28px}.guided-time-track{background:#d3deec;border-radius:5px;height:10px;margin:40px 22px 52px;position:relative}.guided-time-fill{background:#236bce;border-radius:5px;height:100%;transition:width .4s}.guided-time-pointer{background:#236bce;border:5px solid #fff;border-radius:50%;width:26px;height:26px;transition:left .4s;position:absolute;top:-8px;transform:translate(-50%);box-shadow:0 0 0 1px #9bb7db}.guided-time-mark{background:#7893b6;width:1px;height:20px;position:absolute;top:-5px}.guided-time-mark span{text-align:center;width:110px;font-size:12px;line-height:1.4;position:absolute;top:30px;left:0;transform:translate(-50%)}.guided-time-unit{text-align:center;color:var(--muted);margin:15px 0 24px;font-size:12px}.guided-time-comparison{grid-template-columns:repeat(3,1fr);gap:12px;display:grid}.guided-time-comparison button{text-align:left;background:#fff;border-radius:8px;flex-direction:column;align-items:start;gap:8px;padding:15px;display:flex}.guided-time-comparison button.active{border-color:#347ad4;box-shadow:inset 0 -3px #347ad4}.guided-time-comparison strong{font-size:14px}.guided-code-stage{flex-direction:column;justify-content:center;min-height:330px;padding:35px 30px;display:flex}.guided-code-context{color:var(--muted);margin:0 0 16px;font-size:12px}.guided-code-tokens{letter-spacing:.3px;flex-wrap:wrap;gap:8px;font:600 22px/1.6 ui-monospace,SFMono-Regular,Consolas,monospace;display:flex}.guided-code-tokens span{border-bottom:3px solid #0000;border-radius:3px;padding:5px 7px}.guided-code-tokens span.active{color:#124788;background:#d9e8ff;border-color:#1c66c7}.guided-code-connector{border-left:2px solid #7ea7dc;height:35px;margin:15px 0 0 18px}.guided-decoded-label{margin:12px 0 0;font-size:22px;font-weight:650}.guided-evidence-stage{grid-template-columns:minmax(150px,.7fr) minmax(0,1.3fr);gap:26px;min-height:365px;padding:32px 28px;display:grid}.guided-evidence-index{flex-direction:column;align-self:start;gap:0;display:flex;position:relative}.guided-evidence-index:before{content:"";background:#b6c9e2;width:2px;position:absolute;top:30px;bottom:30px;left:17px}.guided-evidence-index button{text-align:left;background:0 0;border:0;justify-content:start;align-items:center;gap:12px;padding:13px 0;display:flex;position:relative}.guided-evidence-index button>span{color:#526e93;background:#f6f9fc;border:1px solid #afc6e5;border-radius:50%;flex-shrink:0;place-items:center;width:35px;height:35px;font-size:12px;display:grid}.guided-evidence-index button>strong{font-size:14px;line-height:1.45}.guided-evidence-index button[aria-pressed=true]>span{color:#fff;background:#236bce;border-color:#236bce}.guided-evidence-index button[aria-pressed=true]>strong{color:#124f9f}.guided-evidence-sheet{background:#fff;border:1px solid #c9d8ec;border-radius:9px;align-self:center;padding:25px;box-shadow:0 8px 22px #152e5310}.guided-evidence-heading{letter-spacing:-.3px;margin:0 0 22px;font-size:21px;font-weight:650;line-height:1.3}.guided-evidence-sheet dl{gap:20px;margin:0;display:grid}.guided-evidence-sheet dt{color:var(--muted);margin-bottom:6px;font-size:12px}.guided-evidence-sheet dd{margin:0;font-size:17px;font-weight:550;line-height:1.5}.guided-evidence-sheet>p:not(.guided-evidence-heading){margin:0;font-size:17px;line-height:1.55}.guided-text-scene{min-height:260px;padding:32px;line-height:1.6}.guided-stage .teaching-canvas{aspect-ratio:auto;height:400px;min-height:320px}.guided-table-stage{align-items:center;min-height:350px;padding:45px 30px;display:grid}.guided-table-stage table{border-collapse:separate;border-spacing:0;text-align:center;background:#fff;border:1px solid #c8d6e8;border-radius:8px;width:100%;font-size:22px;overflow:hidden}.guided-table-stage caption{text-align:left;color:var(--muted);padding:0 0 20px;font-size:13px}.guided-table-stage th,.guided-table-stage td{border-bottom:1px solid #dce5f1;border-right:1px solid #dce5f1;padding:25px 16px;transition:background .2s}.guided-table-stage th{font-size:16px;font-weight:600}.guided-table-stage .trace{background:#edf4ff}.guided-table-stage .selected{color:#fff;background:#236bce;font-weight:700}@media (max-width:600px){.guided-table-stage{min-height:290px;padding:28px 16px}.guided-table-stage table{font-size:19px}.guided-table-stage th,.guided-table-stage td{padding:20px 10px}.guided-table-stage th{font-size:13px}.guided-stage .teaching-canvas{height:310px}}@media (min-width:1600px){.guided-model{height:510px}}@media (max-width:1100px){.guided-model{height:380px}.guided-state-controls{padding:14px 18px}.guided-stage-heading{padding:18px 18px 0}.guided-evidence-stage{gap:16px;padding:24px 20px}.guided-evidence-sheet{padding:20px}.guided-lesson .lesson-text{font-size:18px}}@media (max-width:900px){.guided-lesson .task-intro{border-bottom:1px solid var(--line);padding-bottom:4px}.guided-lesson .lesson-text{margin-bottom:18px}.guided-model{height:420px}.guided-lesson .guided-stage{border-radius:0}.guided-lesson .guided-stage-heading{padding-top:18px}.guided-lesson .guided-chapter{margin-bottom:10px}.guided-lesson .guided-further{margin-bottom:14px}}@media (max-width:600px){.guided-stage-heading h2{font-size:18px}.guided-stage-heading p{font-size:13px}.guided-state-controls{gap:6px;padding:12px}.guided-state-controls button{flex-basis:28%;padding:9px;font-size:12px}.guided-model{height:310px}.guided-view-controls{gap:6px;padding:9px 12px}.guided-view-controls>div{flex-basis:100%}.guided-view-controls>div>button{flex:1}.guided-view-controls button{min-height:44px}.guided-facts{grid-template-columns:repeat(auto-fit,minmax(90px,1fr));gap:13px;padding:16px}.guided-facts dd{font-size:18px}.guided-facts dt{font-size:11px}.guided-lesson .panel-heading h2{font-size:21px}.guided-lesson .lesson-text{font-size:17px}.guided-time-stage{min-height:330px;padding:25px 18px}.guided-time-readout strong{font-size:23px}.guided-time-comparison{gap:7px}.guided-time-comparison button{padding:10px}.guided-time-comparison strong{font-size:12px}.guided-time-mark span{width:80px;font-size:11px}.guided-code-stage{min-height:270px;padding:28px 18px}.guided-code-tokens{gap:3px;font-size:17px}.guided-decoded-label{font-size:19px}.guided-evidence-stage{grid-template-columns:1fr;gap:12px;padding:20px 16px}.guided-evidence-index{flex-direction:row;gap:10px}.guided-evidence-index:before{display:none}.guided-evidence-index button{flex-direction:column;flex:1;align-items:start;gap:6px;padding:0 0 12px}.guided-evidence-index button>strong{font-size:12px}.guided-evidence-sheet{padding:20px}.guided-evidence-heading{font-size:19px}.guided-evidence-sheet dd{font-size:16px}}@media (prefers-reduced-motion:reduce){.guided-time-fill,.guided-time-pointer{transition:none}}
