:root{font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;--heading:"Bricolage Grotesque", "Figtree", ui-sans-serif, system-ui, sans-serif;--mono:"JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;--bg:#f2f4f8;--sidebar:#fff;--panel:#fff;--editor-bg:#fff;--raised:#f2f4f8;--hover:#e9edf3;--border:#dce1ea;--border-strong:#c7cfdc;--text:#0f1728;--secondary:#2a3446;--muted:#5b6577;--accent:#2b55f5;--accent-ink:#2448d8;--accent-hover:#2149e0;--on-accent:#fff;--accent-bg:#e7ecfe;--accent-border:#d3dcfd;--success:#0a7d57;--success-bg:#e2f4ec;--easy:#0b7474;--easy-bg:#dff1f1;--medium:#2448d8;--medium-bg:#e7ecfe;--hard:#bf4419;--hard-bg:#fce9e2;--selection:#2b55f52b;--active-line:#2b55f507;--danger:#b32d45;--danger-bg:#fbe8eb;--warning:#8a5a12;--warning-bg:#fbf1de;--scrollbar:#c7cfdc;--code-keyword:#2448d8;--code-function:#0b7474;--code-type:#bf4419;--code-string:#0a7d57;--code-number:#8a5a12;--code-comment:#697487;--shadow:0 1px 2px #0f172805, 0 6px 20px #0f172808;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;font-family:Figtree,ui-sans-serif,system-ui,-apple-system,Segoe UI,sans-serif}:root[data-theme=dark]{--bg:#0c111b;--sidebar:#141b29;--panel:#141b29;--editor-bg:#141b29;--raised:#0f1521;--hover:#1c2638;--border:#243047;--border-strong:#33415c;--text:#e8ecf4;--secondary:#cdd3e0;--muted:#96a0b5;--accent:#7c9bff;--accent-ink:#9db4ff;--accent-hover:#98b0ff;--on-accent:#0c111b;--accent-bg:#1b2747;--accent-border:#2a3d68;--success:#5ed6ae;--success-bg:#12302a;--easy:#6ad6d6;--easy-bg:#12302f;--medium:#9db4ff;--medium-bg:#1b2747;--hard:#ffa581;--hard-bg:#36201a;--selection:#7c9bff33;--active-line:#7c9bff09;--danger:#f59aaa;--danger-bg:#34191f;--warning:#edbe6c;--warning-bg:#2f2615;--scrollbar:#33415c;--code-keyword:#9db4ff;--code-function:#6ad6d6;--code-type:#ffa581;--code-string:#5ed6ae;--code-number:#edbe6c;--code-comment:#8895ad;--shadow:0 1px 2px #0003, 0 8px 24px #0002;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}*,:before,:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;-moz-text-size-adjust:100%;text-size-adjust:100%}body{background:var(--bg);color:var(--text);margin:0;font-size:15px;line-height:1.6}button,input,select,textarea{font:inherit}button,a,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer;color:inherit;background:0 0;border:0;transition:background-color .15s,color .15s,border-color .15s}button:disabled{cursor:default;opacity:.4}button,a,input,select{outline-offset:3px}:focus-visible{outline:2px solid var(--accent)}a{color:inherit;text-decoration:none}svg{flex-shrink:0}::selection{background:var(--selection)}*{scrollbar-width:thin;scrollbar-color:var(--scrollbar) transparent}::-webkit-scrollbar{width:5px;height:5px}::-webkit-scrollbar-thumb{background:var(--scrollbar);border-radius:5px}code,pre,kbd{font-family:var(--mono)}kbd{font-size:10px;font-weight:400}h1,h2,h3{font-family:var(--heading);color:var(--text);letter-spacing:-.02em}.muted{color:var(--muted)}.eyebrow{color:var(--muted);font:500 10px/1.5 var(--mono);letter-spacing:.07em;text-transform:uppercase}.icon-button{width:34px;height:34px;color:var(--muted);border-radius:11px;justify-content:center;align-items:center;padding:0;display:inline-flex}.icon-button:hover:not(:disabled){background:var(--hover);color:var(--text)}.app-shell{grid-template-rows:60px minmax(0,1fr);grid-template-columns:284px minmax(0,1fr);height:100dvh;display:grid;overflow:hidden}.topbar{background:var(--bg);border-bottom:1px solid var(--border);z-index:5;grid-column:1/-1;justify-content:space-between;align-items:center;gap:14px;padding:0 24px;display:flex}.brand{font:700 20px/1 var(--heading);letter-spacing:-.04em;white-space:nowrap;align-items:center;gap:9px;display:inline-flex}.brand-symbol{background:var(--accent);width:22px;height:22px;color:var(--on-accent);border-radius:7px;place-items:center;display:grid}.top-actions{align-items:center;gap:4px;display:flex}.header-nav-button{color:var(--muted);border:1px solid #0000;border-radius:12px;padding:7px 12px;font-size:14px;font-weight:500}.header-nav-button.current{color:var(--text);background:var(--panel);border-color:var(--border)}.header-nav-button:hover{color:var(--text);background:var(--hover)}.theme-toggle{width:38px;height:38px;margin-left:4px}.rust-version{font:10px var(--mono);color:var(--muted);align-items:center;gap:7px;margin-right:18px;display:flex}.live-dot{background:var(--success);border-radius:50%;width:5px;height:5px;display:inline-block}.sidebar{background:var(--sidebar);border-right:1px solid var(--border);flex-direction:column;min-width:0;min-height:0;display:flex}.sidebar-intro{justify-content:space-between;align-items:center;padding:24px 20px 20px;display:flex}.sidebar-intro h2{margin:5px 0 0;font-size:22px;font-weight:600;line-height:1.2}.sidebar-intro h2 span{font:500 11px var(--mono);color:var(--muted);letter-spacing:0;margin-left:5px}.sidebar-close{display:none}.search-box{border:1px solid var(--border);background:var(--bg);height:40px;color:var(--muted);border-radius:12px;align-items:center;gap:8px;margin:0 16px;padding:0 12px;display:flex}.search-box:focus-within{border-color:var(--accent)}.search-box input{width:100%;min-width:0;color:var(--text);background:0 0;border:0;outline:none;padding:8px 0;font-size:13px}.search-box input::placeholder{color:var(--muted)}.search-box kbd{border:1px solid var(--border);border-radius:5px;flex-shrink:0;padding:1px 4px;font-size:9px}.filters{gap:7px;padding:12px 16px 21px;display:flex}.filters select{border:1px solid var(--border);background:var(--panel);min-width:0;height:32px;color:var(--muted);cursor:pointer;border-radius:10px;flex:1;padding:0 6px;font-size:11px}.filters select option{background:var(--panel);color:var(--text)}.catalog-heading{font:500 9px var(--mono);letter-spacing:.07em;color:var(--muted);justify-content:space-between;align-items:center;padding:0 22px 10px;display:flex}.catalog-heading>span:last-child{letter-spacing:0;font-size:10px}.challenge-list{overscroll-behavior:contain;flex:1;min-height:0;padding:0 12px 20px;overflow:auto}.challenge-group+.challenge-group{margin-top:12px}.group-heading{text-align:left;width:100%;color:var(--muted);font:500 9px/1.5 var(--mono);text-transform:uppercase;letter-spacing:.035em;align-items:center;gap:8px;padding:12px 10px;display:flex}.group-heading:hover{color:var(--text)}.group-count{margin-left:auto;font-size:9px}.category-dot{background:var(--accent);border-radius:2px;flex-shrink:0;width:6px;height:6px}.challenge-group:nth-child(3n+1) .category-dot{background:var(--easy)}.challenge-group:nth-child(3n) .category-dot{background:var(--hard)}.group-items{gap:2px;display:grid}.challenge-link{text-align:left;width:100%;min-height:44px;color:var(--secondary);border:1px solid #0000;border-radius:12px;grid-template-columns:20px minmax(0,1fr) auto;align-items:start;gap:9px;padding:11px 10px;display:grid}.challenge-link:hover{background:var(--bg);color:var(--text)}.challenge-link.active{color:var(--accent-ink);background:var(--accent-bg);border-color:var(--accent-bg)}.challenge-number{font:10px/20px var(--mono);color:var(--muted)}.active .challenge-number{color:var(--accent-ink)}.challenge-link-title{font-size:13px;font-weight:500;line-height:1.5}.challenge-link.active .challenge-link-title{font-weight:600}.challenge-link>.level-dot,.challenge-link>.passed-icon{align-self:center}.level-dot{background:var(--easy);border-radius:50%;flex-shrink:0;width:5px;height:5px;display:inline-block}.level-dot.medium{background:var(--medium)}.level-dot.hard{background:var(--hard)}.sidebar-bottom{border-top:1px solid var(--border);padding:17px 22px 0}.progress-label{justify-content:space-between;align-items:center;gap:8px;font-size:10px;display:flex}.progress-label>span{color:var(--muted);font:500 9px var(--mono);text-transform:uppercase;letter-spacing:.06em;align-items:center;gap:7px;display:flex}.progress-label>span>svg{display:none}.progress-label>strong{font:10px var(--mono);color:var(--text)}.progress-label strong span{color:var(--muted)}progress{appearance:none;background:var(--hover);border:0;border-radius:999px;width:100%;height:6px;margin:12px 0 8px;display:block;overflow:hidden}progress::-webkit-progress-bar{background:var(--hover)}progress::-webkit-progress-value{background:var(--success);border-radius:999px}progress::-moz-progress-bar{background:var(--success)}.progress-caption{color:var(--muted);font-size:11px}.guide-link{border-top:1px solid var(--border);width:100%;color:var(--muted);align-items:center;gap:8px;margin-top:15px;padding:13px 0;font-size:11px;display:flex}.guide-link>svg:last-child{margin-left:auto}.guide-link:hover{color:var(--accent-ink)}.main-area{overscroll-behavior:contain;flex-direction:column;min-width:0;min-height:0;padding:30px 32px 0;display:flex;overflow-y:auto}.workspace-overview{border-bottom:1px solid var(--border);flex-shrink:0;margin-bottom:24px;padding-bottom:23px}.workspace-breadcrumb{flex-wrap:wrap;align-items:center;gap:13px;margin-bottom:15px;display:flex}.workspace-breadcrumb>span:last-child{font:10px var(--mono);color:var(--muted)}.category-chip{background:var(--easy-bg);min-height:24px;color:var(--easy);font:500 9px/1.5 var(--mono);letter-spacing:.05em;text-transform:uppercase;border-radius:999px;align-items:center;padding:4px 11px;display:inline-flex}h1{font:700 clamp(26px, 2.5vw, 34px)/1.2 var(--heading);letter-spacing:-.035em;margin:0 0 10px}.workspace-summary{color:var(--muted);max-width:78ch;margin:0;font-size:14px;line-height:1.6}.workbench{grid-template-columns:minmax(300px, var(--question-width)) 12px minmax(345px, 1fr);flex:1 0 650px;min-width:0;min-height:650px;display:grid}.question-panel,.editor-panel{border:1px solid var(--border);background:var(--panel);border-radius:20px;min-width:0;min-height:0;overflow:hidden}.question-panel{flex-direction:column;display:flex}.panel-tabs{border-bottom:1px solid var(--border);flex-shrink:0;gap:22px;min-height:48px;padding:0 23px;display:flex}.panel-tabs button{color:var(--muted);border-bottom:2px solid #0000;align-items:center;gap:6px;padding:1px 0 0;font-size:12px;font-weight:600;display:flex}.panel-tabs button:hover{color:var(--text)}.panel-tabs button.selected{color:var(--accent-ink);border-bottom-color:var(--accent)}.tab-count{background:var(--raised);min-width:17px;height:17px;color:var(--muted);font:9px var(--mono);border-radius:999px;justify-content:center;align-items:center;padding:0 5px;display:inline-flex}.selected .tab-count{color:var(--accent-ink);background:var(--accent-bg)}.question-content{flex:1;min-height:0;padding:24px;overflow:auto}.question-kicker{flex-wrap:wrap;align-items:center;gap:9px;display:flex}.question-number-pill{color:var(--easy);background:var(--easy-bg);font:500 11px/1.5 var(--mono);border-radius:999px;padding:3px 9px}.question-card-label{color:var(--secondary);font-size:12px;font-weight:600}.passed-label{color:var(--success);align-items:center;gap:4px;margin-left:auto;font-size:9px;display:flex}.question-meta{color:var(--muted);border-bottom:1px solid var(--border);flex-wrap:wrap;align-items:center;gap:12px;margin:16px 0 25px;padding-bottom:20px;font-size:11px;display:flex}.question-meta>span{align-items:center;gap:5px;display:flex}.difficulty-badge{color:var(--easy);background:var(--easy-bg);font:500 10px/1.6 var(--mono);border-radius:999px;padding:3px 9px}.difficulty-badge .level-dot{background:currentColor;width:4px;height:4px}.difficulty-badge.medium{color:var(--medium);background:var(--medium-bg)}.difficulty-badge.hard{color:var(--hard);background:var(--hard-bg)}.language-badge{border-left:1px solid var(--border);font:10px var(--mono);padding-left:12px}.prose{color:var(--secondary);overflow-wrap:anywhere;font-size:14px;line-height:1.75}.description-section{margin-bottom:27px}.description-section h3{margin:0 0 12px;font-size:18px;font-weight:600;line-height:1.3}.description-section p{margin:0 0 13px}.prose code{background:var(--raised);color:var(--secondary);word-break:break-word;border-radius:5px;padding:2px 5px;font-size:11px}.prose a{color:var(--accent-ink);text-decoration:underline;-webkit-text-decoration-color:var(--accent-border);text-decoration-color:var(--accent-border);text-underline-offset:3px}.prose a svg{vertical-align:middle;margin-left:4px}.prose ul{margin:0;padding:0 0 0 18px}.prose li{margin-bottom:12px;padding-left:3px}.prose li::marker{color:var(--muted);font-size:10px}.implement-section{background:var(--accent-bg);border-radius:14px;padding:18px}.implement-section p:last-child{margin-bottom:0}.implement-section h3{font:600 10px/1.5 var(--mono);text-transform:uppercase;color:var(--accent-ink);letter-spacing:.06em;margin-bottom:8px}.implement-section p{font-size:13px}.example-block{background:var(--raised);border:1px solid var(--border);font:11px/1.9 var(--mono);white-space:pre-wrap;overflow-wrap:anywhere;color:var(--secondary);border-radius:14px;padding:16px}.learning-note{background:var(--success-bg);color:var(--secondary);border-radius:14px;align-items:flex-start;gap:10px;margin-top:25px;padding:16px;font-size:12px;display:flex}.learning-note>svg{color:var(--success);margin-top:3px}.learning-note strong{color:var(--success);font-weight:600}.learning-note p{margin:4px 0 0;line-height:1.7}.learning-note>p{margin:0}.question-footer{color:var(--muted);border-top:1px solid var(--border);font:9px var(--mono);align-items:center;gap:9px;margin-top:28px;padding-top:16px;display:flex}.tiny-dot{background:var(--muted);border-radius:50%;width:2px;height:2px;display:inline-block}.panel-resizer{cursor:col-resize;touch-action:none;position:relative}.panel-resizer:after{content:"";background:var(--border-strong);border-radius:2px;width:2px;height:36px;position:absolute;top:calc(50% - 18px);left:calc(50% - 1px)}.panel-resizer:hover:after,.panel-resizer:focus-visible:after{background:var(--accent)}.editor-panel{grid-template-rows:44px 38px 27px minmax(120px,1fr) 26px 58px 38px minmax(140px,20vh);display:grid}.editor-panel.output-collapsed{grid-template-rows:44px 38px 27px minmax(120px,1fr) 26px 58px 38px}.editor-heading{border-bottom:1px solid var(--border);align-items:center;gap:10px;padding:0 15px;display:flex}.editor-heading>span:first-child{align-items:center;gap:7px;font-size:12px;font-weight:600;display:flex}.editor-heading>span:first-child svg{color:var(--muted)}.save-status{color:var(--muted);white-space:nowrap;align-items:center;gap:4px;margin-left:auto;font-size:9px;display:flex}.save-status>svg{color:var(--success)}.save-status.save-error{color:var(--danger)}.editor-tools{gap:1px;display:flex}.editor-tools .icon-button{border-radius:8px;width:26px;height:26px}.file-tabs{border-bottom:1px solid var(--border);background:var(--raised);display:flex;overflow-x:auto}.file-tabs button{font:10px var(--mono);color:var(--muted);border-right:1px solid var(--border);border-top:2px solid #0000;flex-shrink:0;align-items:center;gap:7px;padding:0 15px;display:flex}.file-tabs button.selected{background:var(--editor-bg);color:var(--accent-ink);border-top-color:var(--accent)}.file-tabs button:hover{color:var(--text)}.rust-file-icon{color:var(--hard);font:9px var(--mono);letter-spacing:-1px}.modified-dot{background:var(--muted);border-radius:50%;width:5px;height:5px;margin-left:4px}.editor-breadcrumb{color:var(--muted);font:9px var(--mono);white-space:nowrap;align-items:center;gap:6px;padding:0 15px;display:flex;overflow:hidden}.editor-breadcrumb>span:first-child{text-overflow:ellipsis;overflow:hidden}.readonly-badge{font:8px var(--mono);border:1px solid var(--border);border-radius:5px;margin-left:auto;padding:1px 5px}.code-editor{height:100%;min-height:0;overflow:hidden}.cm-editor.cm-focused{outline:none}.cm-scroller{overflow:auto}.editor-status{color:var(--muted);font:8px var(--mono);border-top:1px solid var(--border);justify-content:space-between;align-items:center;gap:12px;padding:0 15px;display:flex}.editor-status>span{align-items:center;gap:8px;display:flex}.status-spacer{width:3px}.runner-toolbar{border-top:1px solid var(--border);border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;gap:8px;padding:0 15px;display:flex}.runner-toolbar>div{color:var(--muted);align-items:center;gap:7px;font-size:12px;display:flex}.runner-toolbar strong{color:var(--text);font-weight:600}.running-label{color:var(--muted);margin-left:3px;font-size:9px}.primary-button,.secondary-button,.danger-button{border:1px solid #0000;border-radius:12px;justify-content:center;align-items:center;gap:7px;padding:10px 15px;font-size:13px;font-weight:600;line-height:1.4;display:inline-flex}.primary-button{background:var(--accent);color:var(--on-accent);border-color:var(--accent)}.primary-button:hover:not(:disabled){background:var(--accent-hover);border-color:var(--accent-hover)}.run-button{border-radius:11px;height:35px;padding:0 12px;font-size:11px}.run-button kbd{opacity:.7;border-left:1px solid;margin-left:2px;padding-left:8px;font-size:9px;font-weight:500}.secondary-button{border-color:var(--border);background:var(--panel)}.secondary-button:hover{background:var(--hover);border-color:var(--border-strong)}.danger-button{color:var(--danger);border-color:var(--danger);background:var(--danger-bg)}.output-heading{border-bottom:1px solid var(--border);justify-content:space-between;align-items:stretch;padding:0 15px;display:flex}.output-tabs{gap:21px;display:flex}.output-tabs button{color:var(--muted);border-bottom:2px solid #0000;align-items:center;gap:6px;padding:0;font-size:11px;font-weight:500;display:flex}.output-tabs button.selected{border-color:var(--accent);color:var(--accent-ink)}.result-dot{background:var(--success);border-radius:50%;width:4px;height:4px}.result-dot.failure{background:var(--danger)}.output-toggle{border-radius:8px;width:26px;height:26px;margin:auto 0}.output-toggle.closed svg{transform:rotate(180deg)}.test-output{min-height:0;overflow:auto}.output-empty{text-align:center;height:100%;min-height:140px;color:var(--muted);flex-direction:column;justify-content:center;align-items:center;padding:16px 12px;display:flex}.output-empty-icon{background:var(--accent-bg);width:34px;height:34px;color:var(--accent-ink);border-radius:10px;place-items:center;margin-bottom:9px;display:grid}.output-empty strong{color:var(--secondary);font-size:12px;font-weight:500}.output-empty p{margin:5px 0 0;font-size:11px}.output-hint{color:var(--muted);align-items:center;gap:4px;margin-top:12px;font-size:9px;display:flex}.passed-icon{color:var(--success)}.failed-icon{color:var(--danger)}.result-summary{align-items:center;gap:8px;padding:16px 16px 10px;display:flex}.result-summary.success{color:var(--success)}.result-summary.failure{color:var(--danger)}.result-summary strong{font-size:13px;font-weight:600}.result-summary>span{font:9px var(--mono);color:var(--muted);margin-left:auto}.test-totals{font:10px var(--mono);color:var(--secondary);padding:0 16px 12px}.test-totals span{color:var(--muted)}.test-case-list{padding:0 16px}.test-case{border-top:1px solid var(--border);align-items:center;gap:8px;min-width:0;padding:10px 0;display:flex}.test-case code{color:var(--secondary);overflow-wrap:anywhere;min-width:0;font-size:10px}.test-case>span{color:var(--muted);margin-left:auto;font-size:10px}.text-button{color:var(--accent-ink);align-items:center;gap:6px;padding:10px 0;font-size:11px;display:inline-flex}.console-link{margin:3px 16px 7px}.console-output,.failure-details{font:10px/1.8 var(--mono);color:var(--secondary);white-space:pre-wrap;overflow-wrap:anywhere;margin:0;padding:15px 16px}.failure-details{background:var(--danger-bg);color:var(--danger);border-radius:12px;margin:8px 16px;font-size:10px}.compiler-note,.custom-tests-note{color:var(--muted);margin:0 16px 10px;font-size:11px;line-height:1.6}.stale-notice{background:var(--warning-bg);color:var(--warning);border-bottom:1px solid var(--border);padding:9px 16px;font-size:10px}.runner-error{color:var(--danger);padding:20px}.runner-error>svg{vertical-align:middle;margin-right:8px}.runner-error strong{font-size:13px;font-weight:600}.runner-error p{color:var(--secondary);font-size:12px;line-height:1.7}.test-explanation{margin:0 0 22px}.test-file-heading{border:1px solid var(--border);font:10px var(--mono);background:var(--raised);border-radius:12px 12px 0 0;flex-wrap:wrap;align-items:center;gap:7px;padding:11px;display:flex}.test-file-heading button{color:var(--accent-ink);align-items:center;gap:3px;margin-left:auto;font:11px Figtree,sans-serif;display:flex}.public-test-preview{border:1px solid var(--border);white-space:pre-wrap;overflow-wrap:anywhere;font:10px/1.9 var(--mono);border-top:0;border-radius:0 0 12px 12px;margin:0;padding:14px}.app-footer{min-height:42px;color:var(--muted);flex-shrink:0;justify-content:space-between;align-items:center;gap:12px;padding:10px 0;font-size:9px;display:flex}.app-footer>span{align-items:center;gap:6px;display:flex}.app-footer .live-dot{width:4px;height:4px}.workspace-empty{min-height:350px;color:var(--muted);text-align:center;flex-direction:column;flex:1;justify-content:center;align-items:center;gap:12px;padding:24px;display:flex}.workspace-empty h2{margin:0;font-size:24px;font-weight:600}.workspace-empty p{margin:0 0 8px;font-size:14px}.empty-sidebar{text-align:center;color:var(--muted);flex-direction:column;align-items:center;gap:10px;padding:28px 15px;font-size:12px;display:flex}.empty-sidebar strong{color:var(--secondary);font-weight:500}.empty-sidebar button{color:var(--accent-ink);margin-top:6px;font-size:12px}.modal{border:1px solid var(--border-strong);background:var(--panel);width:min(480px,100vw - 32px);max-height:calc(100dvh - 48px);color:var(--text);box-shadow:var(--shadow);border-radius:20px;padding:26px;overflow-y:auto}.modal::backdrop{background:#0007}.modal-heading{justify-content:space-between;align-items:center;gap:12px;margin-bottom:17px;display:flex}.modal-heading h2{margin:0;font-size:23px;font-weight:600;line-height:1.2}.modal>p{color:var(--muted);margin:0 0 20px;font-size:13px;line-height:1.8}.modal p code{font-size:11px}.modal-actions{justify-content:flex-end;gap:9px;margin-top:26px;display:flex}.help-step{border-top:1px solid var(--border);align-items:flex-start;gap:15px;padding:15px 0;display:flex}.help-step>span{font:11px var(--mono);color:var(--accent-ink);padding-top:3px}.help-step strong{font-size:13px;font-weight:600}.help-step p{color:var(--muted);margin:5px 0 0;font-size:12px;line-height:1.8}.shortcut-row{border-top:1px solid var(--border);color:var(--muted);justify-content:space-between;padding:12px 0;font-size:12px;display:flex}.shortcut-row kbd{border:1px solid var(--border);background:var(--raised);border-radius:6px;padding:2px 6px}.help-footer{justify-content:space-between;align-items:center;margin-top:19px;display:flex}.help-footer a{color:var(--accent-ink);align-items:center;gap:5px;font-size:12px;display:flex}.sidebar-overlay{display:none}.spin{animation:1.2s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}@media (width>=1600px){.app-shell{grid-template-columns:310px minmax(0,1fr)}.main-area{padding:35px 44px 0}.question-content{padding:27px 30px}.prose{font-size:15px}}@media (width>=1101px) and (width<=1280px){.app-shell{grid-template-columns:252px minmax(0,1fr)}.main-area{padding:26px 24px 0}.challenge-link-title{font-size:12px}.question-content{padding:22px 20px}.panel-tabs{gap:17px;padding:0 20px}.panel-tabs button{font-size:11px}.save-status{font-size:8px}.editor-heading{gap:6px;padding:0 11px}.file-tabs button{padding:0 12px}.running-label{display:none}}@media (width<=1100px){.app-shell{grid-template-columns:minmax(0,1fr)}.sidebar{z-index:20;width:min(320px,100vw - 36px);height:100dvh;transition:transform .2s;position:fixed;inset:0 auto 0 0;transform:translate(-100%)}.sidebar.is-open{transform:translate(0)}.sidebar-close{display:inline-flex}.sidebar-overlay{z-index:19;background:#0007;display:block;position:fixed;inset:0}.main-area{padding:26px 24px 0}.question-content{padding:23px}}@media (width<=800px){.topbar{padding:0 16px}.brand{font-size:19px}.rust-version{display:none}.main-area{padding:24px 20px 0}.workspace-overview{padding-bottom:20px}h1{font-size:28px}.workspace-summary{font-size:14px}.workbench{flex-direction:column;flex:none;gap:18px;min-height:0;display:flex}.panel-resizer{display:none}.question-panel{flex-shrink:0;height:60dvh;min-height:410px;max-height:650px}.question-content{padding:24px}.prose{font-size:14px}.editor-panel{flex-shrink:0;grid-template-rows:44px 38px 27px minmax(200px,1fr) 26px 58px 38px 200px;height:810px}.editor-panel.output-collapsed{grid-template-rows:44px 38px 27px minmax(200px,1fr) 26px 58px 38px;height:610px}.app-footer>span:last-child{display:none}}@media (width<=480px){.topbar{gap:8px}.brand{gap:7px;font-size:18px}.top-actions{gap:1px}.header-nav-button{padding:6px 9px;font-size:12px}.theme-toggle{width:30px;height:32px;margin-left:2px}.main-area{padding:24px 16px 0}h1{font-size:26px}.workspace-breadcrumb{gap:10px}.workspace-breadcrumb>span:last-child{font-size:9px}.category-chip{max-width:65%;font-size:9px}.question-content{padding:21px 18px}.panel-tabs{gap:20px;padding:0 18px}.panel-tabs button,.question-card-label{font-size:11px}.passed-label{margin-left:0;font-size:9px}.save-status{font-size:8px}.editor-heading{gap:5px;padding:0 10px}.editor-heading>span:first-child{gap:4px;font-size:11px}.editor-tools .icon-button{width:24px}.file-tabs button{padding:0 12px}.running-label{display:none}.output-hint{font-size:8px}.editor-status{padding:0 10px;font-size:7px}.modal{padding:22px}}:is(.editor-panel.is-fullscreen,.editor-panel:fullscreen){z-index:30;border:0;border-radius:0;grid-template-rows:44px 38px 27px minmax(0,1fr) 26px 58px 38px minmax(100px,20dvh);width:100%;height:100dvh;min-height:0;position:fixed;inset:0}:is(.editor-panel.is-fullscreen.output-collapsed,.editor-panel:fullscreen.output-collapsed){grid-template-rows:44px 38px 27px minmax(0,1fr) 26px 58px 38px}@media (prefers-reduced-motion:reduce){*,:before,:after{transition-duration:.01ms!important;animation-duration:.01ms!important}}
