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@media(max-width:650px){.shell{display:block}aside{position:static;height:auto;width:100%;padding:16px 18px;background:#efefe8;border-right:0;border-bottom:1px solid var(--line)}.brand{margin:0 0 16px}.brand small{display:block;font-size:8px}.brand span{font-size:18px}.sidebar-bottom{display:none}nav{grid-template-columns:repeat(4,minmax(0,1fr));gap:3px}nav button{text-align:center;font-size:10px;padding:9px 3px}aside nav span{float:none;font-size:9px}header{height:45px;padding:0 18px;font-size:8px;letter-spacing:1px}.save-label{font-size:9px}main{padding:27px 18px}h1{font-size:35px;letter-spacing:-1px}.intro p{font-size:12px}.home-strip{grid-template-columns:1fr 1fr;margin-bottom:28px}.continue-card{grid-column:1/-1;padding:20px;gap:7px}.continue-card strong{font-size:21px}.mini-stat{padding:16px}.mini-stat strong{font-size:30px}.mini-stat>span{font-size:11px}.mini-stat>small{font-size:10px}.study-grid{gap:24px}.chapter{gap:8px;padding:10px 8px}.chapter strong{font-size:11px}.chapter-symbol{font-size:18px;min-width:19px}.panel{padding:20px 16px;border-radius:9px}.chapter-heading h2{font-size:24px}.chapter-heading p{font-size:12px}.step-nav{gap:2px}.step-nav button{font-size:9px;padding:7px 1px}.step-nav button span{font-size:10px;width:23px;height:23px;line-height:23px}.idea-grid{grid-template-columns:1fr}.idea-card{display:grid;grid-template-columns:28px 1fr;padding:17px 15px}.idea-card h3{font-size:14px}.idea-card p{font-size:12px}.idea-index{margin:0}.section-heading h3{font-size:18px}.flow-diagram{gap:4px}.flow-node{font-size:10px;min-height:63px;padding:10px 2px}.flow-node small{font-size:8px}.flow-arrow{font-size:11px}.trace-code{font-size:10px}.trace-line{padding-left:7px;padding-right:7px}.trace-inspector{padding:15px;grid-template-columns:1fr}.trace-inspector>*{grid-column:1!important;grid-row:auto!important}.trace-controls{gap:7px}.trace-controls .secondary,.trace-controls .primary{padding:9px 11px;font-size:11px}.step-footer>span{font-size:9px}.step-footer .primary,.step-footer .secondary{font-size:10px;padding:9px 11px}.coding-task-cards{grid-template-columns:1fr}.stage-card{padding:22px}.stats{gap:8px}.stat{padding:13px}.stat strong{font-size:25px}.stat span{font-size:10px}.quiz-head{font-size:10px}.quiz h2{font-size:19px}.option{font-size:12px}.studio-badge{display:none}.exercise-picker{grid-template-columns:1fr 1fr}.lab-select,.exercise-search{font-size:16px;min-width:0}.exercise-search{padding:9px}.exercise-list .chapter{font-size:10px;min-width:145px}.task-pane{padding:20px}.task-pane>h2{font-size:23px}.task-pane>.eyebrow{font-size:9px}.task-section>p{font-size:13px}.cm-editor{font-size:16px!important}.cm-scroller{min-height:330px!important;max-height:60vh!important}.cm-gutters{font-size:11px}.editor-top{font-size:11px}.editor-top small{display:none}.lab-input{font-size:16px}.lab-label>span{font-size:8px}.run-toolbar button{font-size:11px}.results-pane{padding:18px}.results-heading .badge{font-size:8px}.lab-status{font-size:12px}footer{padding:18px;font-size:9px}}

.trace-choice{display:flex;gap:6px;padding:5px;background:#f0f2e9;border-radius:7px;margin:0 0 20px}.trace-choice button{flex:1;border:0;background:transparent;padding:10px;color:#657667;font-size:11px;border-radius:5px}.trace-choice button.active{background:#fffefa;color:#2c5440;box-shadow:0 2px 6px #213e3a08}

aside nav button{display:flex;align-items:center;gap:10px}aside nav button>svg{width:17px;height:17px;flex-shrink:0}aside nav .nav-text{float:none;background:transparent;border-radius:0;padding:0}aside nav #mistake-count{margin-left:auto}@media(max-width:650px){aside nav button{display:grid;justify-items:center;gap:5px;font-size:9px}aside nav button>svg{width:15px;height:15px}aside nav .nav-text{line-height:1.4}aside nav #mistake-count{display:none}}

.state-value{white-space:pre-wrap}

.results-stop{margin-left:auto;font-size:10px;padding:5px 9px}.results-stop:disabled{display:none}

dialog{max-width:440px;width:calc(100% - 40px);border:1px solid #d9dfd1;border-radius:12px;background:#fffefa;padding:30px;color:#203348;box-shadow:0 24px 80px #19283230}dialog::backdrop{background:#19283266;backdrop-filter:blur(3px)}dialog h2{margin-top:14px}dialog p{font-size:13px;color:#647568}

/* Desktop chapter navigation and lesson content scroll independently. */
@media(min-width:901px){
 .study-grid{align-items:start}
 .study-grid>.chapters{position:sticky;top:24px;max-height:calc(100dvh - 48px);overflow-y:auto;overscroll-behavior:contain;scrollbar-width:thin;scrollbar-color:#c0cdbd transparent;padding-right:5px}
 .study-grid>.learning-panel{height:calc(100dvh - 48px);overflow-y:auto;overscroll-behavior:contain;scrollbar-width:thin;scrollbar-color:#c0cdbd transparent;scroll-padding-top:24px}
}