*,:after,:before{--tw-border-spacing-x:0;--tw-border-spacing-y:0;--tw-translate-x:0;--tw-translate-y:0;--tw-rotate:0;--tw-skew-x:0;--tw-skew-y:0;--tw-scale-x:1;--tw-scale-y:1;--tw-pan-x: ;--tw-pan-y: ;--tw-pinch-zoom: ;--tw-scroll-snap-strictness:proximity;--tw-gradient-from-position: ;--tw-gradient-via-position: ;--tw-gradient-to-position: ;--tw-ordinal: ;--tw-slashed-zero: ;--tw-numeric-figure: ;--tw-numeric-spacing: ;--tw-numeric-fraction: ;--tw-ring-inset: ;--tw-ring-offset-width:0px;--tw-ring-offset-color:#fff;--tw-ring-color:rgb(59 130 246/0.5);--tw-ring-offset-shadow:0 0 #0000;--tw-ring-shadow:0 0 #0000;--tw-shadow:0 0 #0000;--tw-shadow-colored:0 0 #0000;--tw-blur: ;--tw-brightness: ;--tw-contrast: ;--tw-grayscale: ;--tw-hue-rotate: ;--tw-invert: ;--tw-saturate: ;--tw-sepia: ;--tw-drop-shadow: ;--tw-backdrop-blur: ;--tw-backdrop-brightness: ;--tw-backdrop-contrast: ;--tw-backdrop-grayscale: ;--tw-backdrop-hue-rotate: ;--tw-backdrop-invert: ;--tw-backdrop-opacity: ;--tw-backdrop-saturate: ;--tw-backdrop-sepia: ;--tw-contain-size: ;--tw-contain-layout: ;--tw-contain-paint: ;--tw-contain-style: }::backdrop{--tw-border-spacing-x:0;--tw-border-spacing-y:0;--tw-translate-x:0;--tw-translate-y:0;--tw-rotate:0;--tw-skew-x:0;--tw-skew-y:0;--tw-scale-x:1;--tw-scale-y:1;--tw-pan-x: ;--tw-pan-y: ;--tw-pinch-zoom: ;--tw-scroll-snap-strictness:proximity;--tw-gradient-from-position: ;--tw-gradient-via-position: ;--tw-gradient-to-position: ;--tw-ordinal: ;--tw-slashed-zero: ;--tw-numeric-figure: ;--tw-numeric-spacing: ;--tw-numeric-fraction: ;--tw-ring-inset: ;--tw-ring-offset-width:0px;--tw-ring-offset-color:#fff;--tw-ring-color:rgb(59 130 246/0.5);--tw-ring-offset-shadow:0 0 #0000;--tw-ring-shadow:0 0 #0000;--tw-shadow:0 0 #0000;--tw-shadow-colored:0 0 #0000;--tw-blur: ;--tw-brightness: ;--tw-contrast: ;--tw-grayscale: ;--tw-hue-rotate: ;--tw-invert: ;--tw-saturate: ;--tw-sepia: ;--tw-drop-shadow: ;--tw-backdrop-blur: ;--tw-backdrop-brightness: ;--tw-backdrop-contrast: ;--tw-backdrop-grayscale: ;--tw-backdrop-hue-rotate: ;--tw-backdrop-invert: ;--tw-backdrop-opacity: ;--tw-backdrop-saturate: ;--tw-backdrop-sepia: ;--tw-contain-size: ;--tw-contain-layout: ;--tw-contain-paint: ;--tw-contain-style: }/*
! tailwindcss v3.4.19 | MIT License | https://tailwindcss.com
*/*,:after,:before{box-sizing:border-box;border:0 solid #e5e7eb}:after,:before{--tw-content:""}:host,html{line-height:1.5;-webkit-text-size-adjust:100%;-moz-tab-size:4;-o-tab-size:4;tab-size:4;font-family:var(--font-onest),Arial,sans-serif;font-feature-settings:normal;font-variation-settings:normal;-webkit-tap-highlight-color:transparent}body{line-height:inherit}hr{height:0;color:inherit;border-top-width:1px}abbr:where([title]){-webkit-text-decoration:underline dotted;text-decoration:underline dotted}h1,h2,h3,h4,h5,h6{font-size:inherit;font-weight:inherit}a{color:inherit;text-decoration:inherit}b,strong{font-weight:bolder}code,kbd,pre,samp{font-family:var(--font-mono),Consolas,monospace;font-feature-settings:normal;font-variation-settings:normal;font-size:1em}small{font-size:80%}sub,sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline}sub{bottom:-.25em}sup{top:-.5em}table{text-indent:0;border-color:inherit;border-collapse:collapse}button,input,optgroup,select,textarea{font-family:inherit;font-feature-settings:inherit;font-variation-settings:inherit;font-size:100%;font-weight:inherit;line-height:inherit;letter-spacing:inherit;color:inherit;margin:0;padding:0}button,select{text-transform:none}button,input:where([type=button]),input:where([type=reset]),input:where([type=submit]){-webkit-appearance:button;background-color:transparent;background-image:none}:-moz-focusring{outline:auto}:-moz-ui-invalid{box-shadow:none}progress{vertical-align:baseline}::-webkit-inner-spin-button,::-webkit-outer-spin-button{height:auto}[type=search]{-webkit-appearance:textfield;outline-offset:-2px}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-file-upload-button{-webkit-appearance:button;font:inherit}summary{display:list-item}blockquote,dd,dl,figure,h1,h2,h3,h4,h5,h6,hr,p,pre{margin:0}fieldset{margin:0}fieldset,legend{padding:0}menu,ol,ul{list-style:none;margin:0;padding:0}dialog{padding:0}textarea{resize:vertical}input::-moz-placeholder,textarea::-moz-placeholder{opacity:1;color:#9ca3af}input::placeholder,textarea::placeholder{opacity:1;color:#9ca3af}[role=button],button{cursor:pointer}:disabled{cursor:default}audio,canvas,embed,iframe,img,object,svg,video{display:block;vertical-align:middle}img,video{max-width:100%;height:auto}[hidden]:where(:not([hidden=until-found])){display:none}.container{width:100%}@media (min-width:640px){.container{max-width:640px}}@media (min-width:768px){.container{max-width:768px}}@media (min-width:1024px){.container{max-width:1024px}}@media (min-width:1280px){.container{max-width:1280px}}@media (min-width:1536px){.container{max-width:1536px}}.visible{visibility:visible}.static{position:static}.block{display:block}.inline{display:inline}.hidden{display:none}.resize{resize:both}.italic{font-style:italic}.blur{--tw-blur:blur(8px)}.blur,.filter{filter:var(--tw-blur) var(--tw-brightness) var(--tw-contrast) var(--tw-grayscale) var(--tw-hue-rotate) var(--tw-invert) var(--tw-saturate) var(--tw-sepia) var(--tw-drop-shadow)}.transition{transition-property:color,background-color,border-color,text-decoration-color,fill,stroke,opacity,box-shadow,transform,filter,backdrop-filter;transition-timing-function:cubic-bezier(.4,0,.2,1);transition-duration:.15s}:root{--bg:#0d1117;--bg-soft:#11161e;--panel:#151b24;--panel-strong:#19212c;--panel-hover:#202a37;--editor:#11151b;--text:#ecf2f8;--text-soft:#a6b3c3;--muted:#6f7d8e;--line:#273240;--line-soft:#202a35;--blue:#1969bc;--blue-bright:#357ac1;--blue-deep:#033f7e;--orange:#eb7124;--orange-soft:#f69a5e;--green:#63d6ab;--red:#ff6b6b;--yellow:#e9b654;--shadow:0 18px 48px rgba(0,0,0,0.28)}:root[data-theme=light]{--bg:#eef3f8;--bg-soft:#f5f8fb;--panel:#ffffff;--panel-strong:#f7f9fc;--panel-hover:#edf3f9;--editor:#fbfcfe;--text:#172337;--text-soft:#526276;--muted:#7b8898;--line:#d7e0e9;--line-soft:#e6ebf1;--shadow:0 18px 50px rgba(31,64,100,0.13)}*{box-sizing:border-box}body,html{height:100%}body{margin:0;overflow:hidden;background:var(--bg);color:var(--text);font-family:var(--font-onest),Arial,sans-serif;font-size:14px;text-rendering:optimizeLegibility}button,select{font:inherit}button{color:inherit}button:focus-visible,select:focus-visible{outline:2px solid var(--orange);outline-offset:2px}::-moz-selection{background:rgba(25,105,188,.45)}::selection{background:rgba(25,105,188,.45)}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-thumb{border:2px solid transparent;border-radius:99px;background:#405064;background-clip:padding-box}::-webkit-scrollbar-track{background:transparent}.app-shell{position:relative;grid-template-rows:58px minmax(0,1fr) 24px;height:100dvh;overflow:hidden;background:linear-gradient(125deg,rgba(25,105,188,.06),transparent 30%),var(--bg)}.app-shell,.topbar{display:grid;min-width:0}.topbar{z-index:20;grid-template-columns:285px 1fr auto;border-bottom:1px solid var(--line);background:color-mix(in srgb,var(--bg-soft) 95%,transparent)}.brand,.topbar{align-items:center}.brand{display:flex;min-width:0;height:100%;padding:0 16px;border-right:1px solid var(--line);gap:11px}.brand-mark{position:relative;width:31px;height:31px;flex:0 0 auto;transform:skewX(-12deg)}.brand-mark:after{right:-4px;bottom:1px;height:8px;background:var(--orange);content:""}.brand-mark span,.brand-mark:after{position:absolute;width:8px;border-radius:2px}.brand-mark span{background:var(--blue-bright);transform:skewX(-14deg)}.brand-mark span:first-child{left:1px;bottom:3px;height:15px}.brand-mark span:nth-child(2){left:11px;bottom:3px;height:24px}.brand-mark span:nth-child(3){left:21px;bottom:3px;height:30px;background:var(--blue)}.brand-copy{min-width:0}.brand-title{display:flex;align-items:center;gap:8px}.brand-title strong{font-size:16px;font-weight:750;letter-spacing:-.03em}.brand-title span{padding:3px 6px;border-radius:4px;background:var(--blue-deep);color:white;font-size:9px;font-weight:800;letter-spacing:.08em}.brand-copy small{display:block;overflow:hidden;margin-top:1px;color:var(--muted);font-size:9px;letter-spacing:.02em;text-overflow:ellipsis;white-space:nowrap}.mode-switch{justify-self:center;display:flex;align-items:center;height:36px;padding:3px;border:1px solid var(--line);border-radius:8px;background:var(--panel)}.mode-switch button{display:flex;align-items:center;height:28px;padding:0 14px;border:0;border-radius:5px;background:transparent;color:var(--text-soft);font-size:12px;font-weight:620;cursor:pointer;gap:7px}.mode-switch button.active{background:var(--blue);box-shadow:0 5px 18px rgba(25,105,188,.28);color:white}.top-actions{min-width:0;height:100%;padding:0 12px;gap:7px}.language-select,.top-actions{display:flex;align-items:center}.language-select{position:relative;height:34px;padding:0;border:1px solid var(--line);border-radius:7px;background:var(--panel);color:var(--text-soft)}.language-select>svg{position:absolute;pointer-events:none}.language-select>svg:first-child{left:8px}.language-select>svg:last-child{right:8px}.language-select:focus-within{outline:2px solid var(--orange);outline-offset:2px}.language-select select{width:100%;height:100%;padding:0 28px;border:0;outline:0;background:transparent;color:var(--text);font-size:12px;font-weight:650;-webkit-appearance:none;-moz-appearance:none;appearance:none;cursor:pointer}.language-select option{background:var(--panel)}.detected-language{color:var(--muted);font-size:10px;white-space:nowrap}.examples-top-button,.run-button,.save-button,.stop-button,.top-icon-button{display:flex;align-items:center;height:34px;border:0;border-radius:7px;cursor:pointer;gap:7px}.save-button{padding:0 10px;border:1px solid var(--line);background:transparent;color:var(--text-soft);font-size:11px}.examples-top-button{display:flex;align-items:center;height:34px;padding:0 10px;border:1px solid rgba(25,105,188,.38);border-radius:7px;background:rgba(25,105,188,.1);color:#79b9f0;font-size:11px;cursor:pointer;gap:6px}.run-button{padding:0 11px;background:var(--blue);box-shadow:0 6px 18px rgba(25,105,188,.28);color:white;font-size:11px;font-weight:720}.run-button svg{color:var(--orange-soft)}.stop-button{padding:0 12px;border:1px solid rgba(255,154,154,.42);background:linear-gradient(135deg,#c74646,#a82f38);box-shadow:0 6px 18px rgba(182,59,59,.28);color:white;font-size:11px;font-weight:720}.stop-button:hover{border-color:rgba(255,190,190,.68);background:linear-gradient(135deg,#d25252,#b23640)}.top-icon-button{width:34px;justify-content:center;border:1px solid var(--line);background:transparent;color:var(--text-soft)}.workspace{display:grid;grid-template-columns:50px 238px minmax(430px,1fr) minmax(360px,420px);grid-template-rows:minmax(0,1fr);min-height:0;overflow:hidden}.workspace.visual-workspace{grid-template-columns:50px 238px minmax(390px,1fr) 8px minmax(420px,var(--preview-width,540px))}.activity-rail{grid-column:1;display:flex;flex-direction:column;justify-content:space-between;border-right:1px solid var(--line);background:var(--bg-soft)}.activity-bottom,.activity-top{display:flex;flex-direction:column;align-items:center;padding:8px 0;gap:5px}.activity-rail button{position:relative;display:grid;width:38px;height:38px;place-items:center;border:0;border-radius:7px;background:transparent;color:var(--muted);cursor:pointer}.activity-rail button:hover{background:var(--panel-hover);color:var(--text)}.activity-rail button.active{background:rgba(25,105,188,.14);color:#6fb4f1}.activity-rail button.active:before{position:absolute;top:8px;bottom:8px;left:-6px;width:3px;border-radius:0 4px 4px 0;background:var(--orange);content:""}.activity-rail button:after{position:absolute;z-index:30;top:50%;left:45px;display:none;padding:6px 8px;border:1px solid var(--line);border-radius:5px;background:var(--panel-strong);box-shadow:var(--shadow);color:var(--text);font-size:10px;content:attr(data-tooltip);transform:translateY(-50%);white-space:nowrap}.activity-rail button:hover:after{display:block}.activity-dot{position:absolute;top:7px;right:6px;width:6px;height:6px;border:1px solid var(--bg-soft);border-radius:50%;background:var(--orange)}.course-sidebar{display:flex;min-width:0;flex-direction:column;border-right:1px solid var(--line);background:var(--panel)}.track-switch{display:grid;grid-template-columns:1fr 1fr;margin:12px;padding:3px;border:1px solid var(--line);border-radius:7px;background:var(--bg-soft)}.track-switch button{display:flex;align-items:center;justify-content:center;height:30px;border:0;border-radius:5px;background:transparent;color:var(--muted);font-size:10px;font-weight:650;cursor:pointer;gap:5px}.track-switch button.active{background:var(--panel-hover);color:var(--text)}.course-progress{padding:3px 15px 14px;border-bottom:1px solid var(--line-soft)}.progress-head{display:flex;align-items:end;justify-content:space-between;margin-bottom:10px}.progress-head div{min-width:0}.progress-head small,.sandbox-title small{display:block;margin-bottom:3px;color:var(--muted);font-size:8px;font-weight:750;letter-spacing:.12em;text-transform:uppercase}.progress-head strong{display:block;overflow:hidden;font-size:13px;font-weight:680;text-overflow:ellipsis;white-space:nowrap}.progress-head>span{color:var(--orange);font:700 12px var(--font-mono)}.progress-track{height:5px;overflow:hidden;border-radius:10px;background:var(--bg)}.progress-track span{display:block;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--blue),var(--orange))}.course-progress p{margin:7px 0 0;color:var(--muted);font-size:9px}.lesson-tree{min-height:0;flex:1;overflow-y:auto;padding:9px 8px 12px}.lesson-level+.lesson-level{margin-top:12px}.special-level{padding-top:7px;border-top:1px solid var(--line-soft)}.special-level .level-title{color:var(--orange-soft)}.level-title{display:flex;align-items:center;height:24px;padding:0 6px;color:var(--text-soft);font-size:9px;font-weight:750;letter-spacing:.07em;text-transform:uppercase;gap:5px}.level-title small{margin-left:auto;color:var(--muted);font:8px var(--font-mono)}.level-lessons{display:flex;flex-direction:column;gap:2px}.lesson-row{display:grid;grid-template-columns:23px minmax(0,1fr);align-items:center;min-height:32px;padding:4px 7px;border:0;border-radius:6px;background:transparent;color:var(--text-soft);font-size:10px;text-align:left;cursor:pointer;gap:7px}.lesson-row>span:last-child{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.lesson-row:hover{background:var(--panel-hover);color:var(--text)}.lesson-row.selected{position:relative;background:rgba(25,105,188,.18);color:var(--text)}.lesson-row.selected:after{position:absolute;top:6px;right:0;bottom:6px;width:2px;border-radius:2px 0 0 2px;background:var(--orange);content:""}.lesson-state{display:grid;width:20px;height:20px;place-items:center;border:1px solid var(--line);border-radius:5px;color:var(--muted);font:9px var(--font-mono)}.lesson-row.selected .lesson-state,.lesson-row:has(.lesson-state svg) .lesson-state{border-color:rgba(25,105,188,.45);background:var(--blue);color:white}.sidebar-note{display:flex;align-items:center;margin:8px;padding:10px;border:1px solid var(--line);border-radius:7px;background:var(--bg-soft);color:var(--blue-bright);gap:8px}.sidebar-note div{min-width:0}.sidebar-note span,.sidebar-note strong{display:block}.sidebar-note strong{color:var(--text-soft);font-size:9px}.sidebar-note span{margin-top:2px;color:var(--muted);font-size:8px;line-height:1.35}.editor-column{grid-column:3;display:grid;grid-template-rows:38px minmax(220px,1fr) minmax(150px,28%);min-width:0;min-height:0;border-right:1px solid var(--line);background:var(--editor)}.editor-toolbar{justify-content:space-between;border-bottom:1px solid var(--line);background:var(--panel)}.editor-toolbar,.file-tab{display:flex;align-items:center}.file-tab{align-self:stretch;min-width:145px;padding:0 12px;border-right:1px solid var(--line);color:var(--text-soft);font:10px var(--font-mono);gap:7px}.file-tab.active{border-top:2px solid var(--blue-bright);background:var(--editor);color:var(--text)}.file-dot{width:7px;height:7px;border-radius:2px;background:var(--yellow)}.file-dot.python{background:#4ca3d9}.file-dot.react{background:#62d9f5}.file-dot.p5{background:#ed226d}.file-tab i{width:5px;height:5px;margin-left:auto;border-radius:50%;background:var(--orange)}.editor-tools{display:flex;align-items:center;padding:0 8px;gap:2px}.editor-tools>button,.more-menu-wrap>button{display:grid;width:28px;height:28px;place-items:center;border:0;border-radius:5px;background:transparent;color:var(--muted);cursor:pointer}.editor-tools button:hover{background:var(--panel-hover);color:var(--text)}.more-menu-wrap{position:relative}.more-menu{position:absolute;z-index:50;top:33px;right:0;width:170px;padding:5px;border:1px solid var(--line);border-radius:8px;background:var(--panel-strong);box-shadow:var(--shadow)}.more-menu button{display:flex;width:100%;align-items:center;padding:8px;border:0;border-radius:5px;background:transparent;color:var(--text-soft);font-size:10px;cursor:pointer;gap:8px}.more-menu button:hover{background:var(--panel-hover);color:var(--text)}.editor-area{min-width:0;min-height:0}.editor-loading{display:grid;height:100%;place-items:center;color:var(--muted);font-size:11px}.output-panel{display:grid;grid-template-rows:34px minmax(0,1fr);min-height:0;border-top:1px solid var(--line);background:var(--bg-soft)}.output-tabs{display:flex;align-items:center;border-bottom:1px solid var(--line-soft);padding:0 9px;gap:4px}.output-tabs button{position:relative;display:flex;align-items:center;height:100%;padding:0 8px;border:0;background:transparent;color:var(--muted);font-size:9px;font-weight:650;cursor:pointer;gap:6px}.output-tabs button.active{color:var(--text)}.output-tabs button.active:after{position:absolute;right:8px;bottom:0;left:8px;height:2px;background:var(--orange);content:""}.output-tabs button>span{display:grid;min-width:16px;height:16px;place-items:center;border-radius:8px;background:rgba(255,107,107,.16);color:var(--red);font:8px var(--font-mono)}.output-status{display:flex;align-items:center;margin-left:auto;color:var(--muted);font-size:8px;gap:4px}.output-status:has(.lucide-circle-check-big){color:var(--green)}.output-body{min-height:0;overflow:auto;padding:10px 13px;font:11px/1.55 var(--font-mono)}.console-line{display:flex;color:var(--text-soft);gap:8px}.console-line+.console-line{margin-top:4px}.console-line>span{color:var(--blue-bright)}.console-line.is-status{padding:6px 8px;border:1px solid rgba(25,105,188,.24);border-radius:6px;background:rgba(25,105,188,.08);color:var(--text-soft)}.console-line.is-status>span{color:var(--blue-bright)}.console-line pre,.diagnostic pre{margin:0;font:inherit;white-space:pre-wrap}.console-input{display:grid;margin-top:10px;padding:9px;border:1px solid rgba(25,105,188,.38);border-radius:7px;animation:consoleInputIn .16s ease-out;background:color-mix(in srgb,var(--editor) 88%,var(--blue) 12%);box-shadow:inset 0 1px 0 rgba(255,255,255,.04);gap:7px}.console-input label{color:var(--blue-bright);font:650 10px var(--font-onest)}.console-input>div{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:8px}.console-input input{min-width:0;height:32px;padding:0 10px;border:1px solid var(--line);border-radius:6px;outline:0;background:var(--panel);color:var(--text);font:11px var(--font-mono)}.console-input input:focus{border-color:var(--blue-bright);box-shadow:0 0 0 3px rgba(25,105,188,.18)}.console-input button{height:32px;padding:0 11px;border:1px solid rgba(25,105,188,.46);border-radius:6px;background:var(--blue);color:white;font:700 10px var(--font-onest);cursor:pointer}@keyframes consoleInputIn{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}.output-empty{margin:0;color:var(--muted);font:10px var(--font-onest)}.diagnostic{display:flex;padding:9px;border:1px solid var(--line);border-radius:7px;background:var(--panel);color:var(--text-soft);gap:9px}.diagnostic+.diagnostic{margin-top:7px}.diagnostic.error>svg{color:var(--red)}.diagnostic.warning>svg{color:var(--yellow)}.diagnostic strong{display:block;margin-bottom:4px;color:var(--text);font:650 9px var(--font-onest)}.diagnostic-title{display:block;margin-bottom:3px;color:var(--red);font:750 10px var(--font-onest)}.diagnostic-message{max-width:720px;margin:0;color:var(--text-soft);font:10px/1.55 var(--font-onest)}.technical-details{margin-top:8px;border-top:1px solid var(--line-soft);padding-top:8px}.technical-details summary{display:inline-flex;align-items:center;color:var(--muted);font:8px var(--font-onest);cursor:pointer;gap:5px}.technical-details pre{max-height:170px;overflow:auto;margin-top:8px;padding:9px;border-radius:6px;background:var(--editor);color:var(--muted);font-size:8px}.no-problems{display:flex;align-items:center;color:var(--green);gap:10px}.no-problems span,.no-problems strong{display:block}.no-problems strong{font:650 10px var(--font-onest)}.no-problems span{margin-top:3px;color:var(--muted);font:9px var(--font-onest)}.right-column{grid-column:4;display:flex;min-width:0;min-height:0;flex-direction:column;background:var(--panel)}.visual-workspace .right-column{grid-column:5}.right-column.with-preview .preview-panel{height:64%;min-height:320px;border-bottom:1px solid var(--line)}.right-column.with-preview .learning-panel,.right-column.with-preview .sandbox-guide{height:36%;min-height:0}.workspace-splitter{position:relative;z-index:8;display:grid;min-width:8px;grid-column:4;place-items:center;border-right:1px solid var(--line);border-left:1px solid var(--line);background:var(--bg-soft);cursor:col-resize;touch-action:none}.workspace-splitter:before{position:absolute;width:18px;content:"";inset-block:0}.workspace-splitter span{width:2px;height:46px;border-radius:99px;background:var(--line);transition:background .16s ease,height .16s ease}.is-resizing-preview .workspace-splitter span,.workspace-splitter:focus-visible span,.workspace-splitter:hover span{height:72px;background:var(--orange)}.is-resizing-preview,.is-resizing-preview *{cursor:col-resize!important;-webkit-user-select:none!important;-moz-user-select:none!important;user-select:none!important}.learning-panel{position:relative;display:grid;min-height:0;flex:1;grid-template-rows:minmax(0,1fr);background:var(--panel)}.learning-tabs{display:flex;align-items:center;padding:0 10px;border-bottom:1px solid var(--line);gap:3px}.learning-tabs button{position:relative;display:flex;height:100%;align-items:center;padding:0 9px;border:0;background:transparent;color:var(--muted);font-size:9px;font-weight:650;cursor:pointer;gap:6px}.learning-tabs button.active{color:var(--text)}.learning-tabs button.active:after{position:absolute;right:8px;bottom:0;left:8px;height:2px;background:var(--blue-bright);content:""}.learning-scroll{min-height:0;overflow-y:auto;padding:19px 19px 92px}.lesson-hero{position:relative;padding-bottom:18px;border-bottom:1px solid var(--line-soft)}.lesson-hero:after{position:absolute;top:-19px;right:-19px;width:100px;height:82px;background:linear-gradient(145deg,transparent 40%,rgba(25,105,188,.12) 41% 55%,transparent 56%),linear-gradient(145deg,transparent 58%,rgba(235,113,36,.11) 59% 64%,transparent 65%);content:"";pointer-events:none}.lesson-number{margin-bottom:7px;color:var(--orange);font-size:8px;font-weight:800;letter-spacing:.12em;text-transform:uppercase}.lesson-hero h1,.sandbox-guide h1,.security-hero h1{margin:0;color:var(--text);font-size:22px;font-weight:760;letter-spacing:-.035em;line-height:1.15}.lesson-hero p,.sandbox-guide>p,.security-hero p{margin:9px 0 0;color:var(--text-soft);font-size:11px;line-height:1.65}.lesson-reward{display:inline-flex;align-items:center;margin-top:12px;padding:5px 7px;border:1px solid rgba(235,113,36,.24);border-radius:5px;background:rgba(235,113,36,.07);color:var(--orange-soft);font-size:8px;gap:5px}.lesson-assistant-actions,.local-assistant-actions{display:flex;margin-top:10px;flex-wrap:wrap;gap:6px}.lesson-assistant-actions button,.local-assistant-actions button,.why-error-button{display:inline-flex;min-height:36px;align-items:center;justify-content:center;padding:0 9px;border:1px solid var(--line);border-radius:6px;background:var(--bg-soft);color:var(--text-soft);font-size:9px;cursor:pointer;gap:5px}.lesson-assistant-actions button:hover,.local-assistant-actions button:hover,.why-error-button:hover{border-color:var(--blue);color:var(--text)}.lesson-assistant-answer,.why-error-answer{margin-top:9px;padding:10px;overflow:hidden;border:1px solid rgba(25,105,188,.25);border-radius:7px;background:rgba(25,105,188,.08)}.lesson-assistant-answer strong{color:var(--blue-bright);font-size:8px}.lesson-assistant-answer p,.why-error-answer{margin-bottom:0;color:var(--text-soft);font-size:9px;line-height:1.55}.why-error-button{margin-top:8px}.why-error-answer{margin-bottom:0}.lesson-section{padding:17px 0;border-bottom:1px solid var(--line-soft)}.section-label{display:flex;align-items:center;margin-bottom:9px;color:var(--blue-bright);font-size:9px;font-weight:750;letter-spacing:.06em;text-transform:uppercase;gap:6px}.lesson-section p{margin:0;color:var(--text-soft);font-size:10px;line-height:1.7}.lesson-section p+p{margin-top:8px}.task-card{margin:14px -2px 0;padding:14px;border:1px solid rgba(25,105,188,.28);border-radius:9px;background:linear-gradient(145deg,rgba(25,105,188,.1),transparent 55%)}.task-card h2{margin:0 0 7px;font-size:14px}.lesson-task-guide{display:grid;margin-top:11px;gap:8px}.lesson-task-guide article{padding:9px 10px;border-left:2px solid rgba(25,105,188,.55);border-radius:0 6px 6px 0;background:rgba(8,18,32,.12)}.lesson-task-guide strong{display:block;margin-bottom:4px;color:var(--text);font-size:9px}.lesson-task-guide p{font-size:9px}.lesson-result-example{color:var(--orange-soft)!important;font-family:var(--font-mono)}.lesson-mistakes-list{display:grid;margin:0;padding-left:15px;color:var(--text-soft);font-size:9px;line-height:1.5;gap:3px}.graphic-task-preview{margin-top:14px;padding:13px;border:1px solid rgba(99,214,171,.28);border-radius:9px;background:linear-gradient(145deg,rgba(99,214,171,.09),transparent 58%)}.graphic-preview-frame{display:grid;grid-template-columns:128px minmax(0,1fr);align-items:center;gap:11px}.graphic-preview-frame img,.graphic-preview-frame svg{width:128px;border:1px solid rgba(132,166,200,.25);border-radius:7px;background:#101a29}.graphic-preview-frame img{max-width:100%;max-height:160px;-o-object-fit:contain;object-fit:contain}.graphic-preview-frame svg>*{fill:rgba(25,105,188,.42);stroke:#76b8ff;stroke-linecap:round;stroke-linejoin:round;stroke-width:3}.graphic-preview-frame svg .graphic-accent{fill:rgba(235,113,36,.8);stroke:#f6a66f}.graphic-preview-frame svg .graphic-light{fill:rgba(236,242,248,.9);stroke:#dfeaff}.graphic-preview-frame strong{color:var(--text);font-size:10px}.graphic-preview-details p,.graphic-preview-frame p{margin:4px 0 0;color:var(--text-soft);font-size:8px;line-height:1.5}.graphic-preview-details{margin-top:11px;padding-top:10px;border-top:1px solid rgba(132,166,200,.18)}.graphic-preview-details>span{display:flex;align-items:center;color:var(--green);font-size:8px;font-weight:750;gap:5px}.graphic-preview-details>div{display:flex;margin-top:6px;flex-wrap:wrap;gap:5px}.graphic-preview-details code{padding:3px 5px;border-radius:4px;background:rgba(25,105,188,.14);color:var(--blue-bright);font:8px var(--font-mono)}.criteria-list{display:flex;flex-direction:column;margin:12px 0 0;padding:0;list-style:none;gap:7px}.criteria-list li{display:flex;align-items:flex-start;color:var(--text-soft);font-size:9px;line-height:1.45;gap:7px}.criteria-list svg{margin-top:1px;flex:0 0 auto;color:var(--green)}.hint-zone{margin-top:14px;padding:13px;border:1px solid var(--line);border-radius:9px;background:var(--bg-soft)}.lesson-safety-note{display:flex;align-items:flex-start;margin-top:12px;padding:11px;border:1px solid rgba(44,168,117,.22);border-radius:8px;background:rgba(44,168,117,.06);gap:9px}.lesson-safety-note>svg{flex:0 0 auto;color:var(--green)}.lesson-safety-note strong{display:block;color:var(--text);font-size:9px}.lesson-safety-note p{margin:4px 0 0;color:var(--text-soft);font-size:8px;line-height:1.5}.hint-head{justify-content:space-between}.hint-head,.hint-head>div{display:flex;align-items:center}.hint-head>div{color:var(--yellow);gap:6px}.hint-head strong{color:var(--text);font-size:10px}.hint-head>span{color:var(--muted);font:8px var(--font-mono)}.hint-text,.hint-zone>p{margin:8px 0 11px;color:var(--text-soft);font-size:9px;line-height:1.55}.hint-text small{display:block;margin-bottom:5px;color:var(--yellow);font-size:8px;font-weight:700}.secondary-action{display:flex;width:100%;height:38px;align-items:center;justify-content:center;border:1px solid var(--line);border-radius:6px;background:var(--panel);color:var(--text-soft);font-size:10px;cursor:pointer;gap:6px}.secondary-action:hover:not(:disabled){border-color:var(--blue);color:var(--text)}.secondary-action:disabled{opacity:.55;cursor:default}.solution-link{display:flex;width:100%;align-items:center;margin-top:10px;min-height:40px;padding:0 11px;border:1px solid rgba(235,113,36,.28);border-radius:7px;background:rgba(235,113,36,.05);color:var(--orange-soft);font-size:10px;cursor:pointer;gap:7px}.solution-link svg:last-child{margin-left:auto}.solution-link:hover{color:var(--text)}.solution-box{margin-top:14px;padding:13px;border:1px solid rgba(235,113,36,.28);border-radius:9px;background:rgba(235,113,36,.05)}.solution-box pre{overflow:auto;margin:0 0 11px;padding:10px;border-radius:6px;background:var(--editor);color:var(--text-soft);font:9px/1.55 var(--font-mono);white-space:pre-wrap}.solution-box li,.solution-box p{color:var(--text-soft);font-size:9px;line-height:1.55}.solution-box strong{display:block;margin-top:10px;color:var(--text);font-size:9px}.solution-box ul{margin:6px 0 0;padding-left:16px}.check-sticky{position:absolute;z-index:5;right:0;bottom:0;left:0;padding:10px 17px 12px;border-top:1px solid var(--line);background:color-mix(in srgb,var(--panel) 94%,transparent);backdrop-filter:blur(12px)}.check-button{display:flex;width:100%;height:42px;align-items:center;justify-content:center;border:0;border-radius:7px;background:var(--blue);box-shadow:0 7px 20px rgba(25,105,188,.24);color:white;font-size:11px;font-weight:720;cursor:pointer;gap:7px}.check-sticky>span{display:block;margin-top:5px;color:var(--muted);font-size:7px;text-align:center}.spinner{width:14px;height:14px;border:2px solid rgba(255,255,255,.3);border-top-color:white;border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(1turn)}}.celebration-backdrop,.dialog-backdrop{position:fixed;z-index:100;inset:0;display:grid;place-items:center;background:rgba(3,8,14,.72);backdrop-filter:blur(7px)}.confirm-dialog{position:relative;width:min(360px,calc(100vw - 32px));padding:25px;border:1px solid var(--line);border-radius:14px;background:var(--panel-strong);box-shadow:var(--shadow);text-align:center}.dialog-close{position:absolute;top:10px;right:10px;display:grid;width:28px;height:28px;place-items:center;border:0;border-radius:6px;background:transparent;color:var(--muted);cursor:pointer}.dialog-icon{display:grid;width:46px;height:46px;margin:0 auto 13px;place-items:center;border-radius:50%;background:rgba(235,113,36,.14);color:var(--orange)}.confirm-dialog h3{margin:0;font-size:17px}.confirm-dialog p{margin:9px 0 18px;color:var(--text-soft);font-size:10px;line-height:1.6}.dialog-actions{display:grid;grid-template-columns:1fr 1fr;gap:7px}.dialog-actions button{height:34px;border:1px solid var(--line);border-radius:7px;background:var(--panel);font-size:9px;cursor:pointer}.dialog-actions button.danger-soft{border-color:rgba(235,113,36,.3);background:rgba(235,113,36,.12);color:var(--orange-soft)}.security-scroll{padding-bottom:24px}.security-hero{text-align:center}.security-shield{display:grid;width:54px;height:54px;margin:0 auto 13px;place-items:center;border:1px solid rgba(25,105,188,.35);border-radius:15px 5px 15px 5px;background:rgba(25,105,188,.12);color:#68b1f2;transform:rotate(-3deg)}.security-grid{display:grid;margin-top:19px;grid-template-columns:1fr 1fr;gap:8px}.security-grid article{padding:11px;border:1px solid var(--line);border-radius:8px;background:var(--bg-soft)}.security-grid article>div{display:flex;align-items:center;justify-content:space-between;gap:6px}.security-grid strong{font-size:10px}.security-grid span{color:var(--orange);font:7px var(--font-mono);white-space:nowrap}.security-grid p{margin:7px 0 0;color:var(--text-soft);font-size:8px;line-height:1.5}.security-list{margin-top:20px}.security-list h2{margin:0 0 9px;font-size:12px}.security-list>div{display:flex;align-items:flex-start;padding:7px 0;border-bottom:1px solid var(--line-soft);color:var(--text-soft);font-size:9px;line-height:1.45;gap:8px}.security-list svg{margin-top:1px;flex:0 0 auto;color:var(--green)}.security-callout{display:flex;margin-top:16px;padding:11px;border:1px solid rgba(233,182,84,.24);border-radius:8px;background:rgba(233,182,84,.06);color:var(--yellow);gap:8px}.security-callout p{margin:0;color:var(--text-soft);font-size:8px;line-height:1.5}.preview-panel{display:grid;grid-template-rows:39px minmax(0,1fr);min-height:0;background:var(--bg-soft)}.preview-toolbar{display:flex;align-items:center;justify-content:space-between;padding:0 10px 0 13px;border-bottom:1px solid var(--line);background:var(--panel)}.preview-toolbar>div{display:flex;align-items:center;min-width:0;gap:8px}.preview-actions{display:flex;align-items:center;gap:5px}.preview-toolbar strong{font-size:9px}.preview-toolbar span{display:flex;align-items:center;color:var(--green);font-size:7px;gap:3px}.icon-text-button{display:flex;align-items:center;height:26px;padding:0 7px;border:1px solid var(--line);border-radius:5px;background:transparent;color:var(--text-soft);font-size:8px;cursor:pointer;gap:5px}.preview-stage{min-height:0;padding:10px;background:linear-gradient(45deg,rgba(25,105,188,.035) 25%,transparent 25%) 0 0/16px 16px,linear-gradient(-45deg,rgba(25,105,188,.035) 25%,transparent 25%) 0 8px/16px 16px,var(--bg)}.preview-stage iframe{width:100%;height:100%;border:1px solid var(--line);border-radius:7px;background:white}@media (min-width:1024px){.preview-focused .workspace.visual-workspace{grid-template-columns:50px 0 0 0 minmax(0,1fr)}.preview-focused .editor-column,.preview-focused .workspace-splitter,.preview-focused .workspace>.course-sidebar{display:none}.preview-focused .visual-workspace .right-column{grid-column:5}.preview-focused .right-column.with-preview .preview-panel{height:100%;min-height:0;border-bottom:0}.preview-focused .right-column.with-preview .learning-panel,.preview-focused .right-column.with-preview .sandbox-guide{display:none}}.preview-empty{display:flex;height:100%;align-items:center;justify-content:center;flex-direction:column;padding:20px;text-align:center}.preview-orbit{position:relative;width:45px;height:45px;margin-bottom:12px;border:1px solid var(--blue);border-radius:50%}.preview-orbit:after,.preview-orbit:before{position:absolute;border:1px solid rgba(235,113,36,.55);border-radius:50%;content:"";inset:8px -7px;transform:rotate(55deg)}.preview-orbit:after{border-color:rgba(53,122,193,.7);transform:rotate(-55deg)}.preview-empty strong{font-size:10px}.preview-empty p{max-width:250px;margin:6px 0 0;color:var(--muted);font-size:8px;line-height:1.5}.sandbox-sidebar{padding:17px 12px 12px}.sandbox-title{padding:0 3px 17px;border-bottom:1px solid var(--line-soft)}.sandbox-title h2{margin:0;font-size:18px;letter-spacing:-.03em}.sandbox-title p{margin:6px 0 0;color:var(--text-soft);font-size:9px;line-height:1.5}.template-list{display:flex;flex-direction:column;margin-top:15px;gap:4px}.template-list>span{padding:0 4px 5px;color:var(--muted);font-size:8px;font-weight:750;letter-spacing:.09em;text-transform:uppercase}.template-list button{display:flex;align-items:center;height:36px;padding:0 10px;border:1px solid transparent;border-radius:7px;background:transparent;color:var(--text-soft);font-size:10px;cursor:pointer;gap:8px}.template-list button.active,.template-list button:hover{border-color:var(--line);background:var(--panel-hover);color:var(--text)}.template-list button.active{border-color:rgba(25,105,188,.35)}.side-arrow{margin-left:auto;transform:rotate(-90deg)}.sandbox-achievement{display:flex;width:100%;align-items:center;margin-top:auto;padding:12px;border:1px solid rgba(235,113,36,.22);border-radius:9px;background:rgba(235,113,36,.06);color:var(--text);font:inherit;text-align:left;cursor:pointer;gap:9px}.sandbox-achievement:hover{border-color:rgba(235,113,36,.48);background:rgba(235,113,36,.1)}.achievement-icon{display:grid;width:35px;height:35px;flex:0 0 auto;place-items:center;border-radius:50%;background:rgba(235,113,36,.15);color:var(--orange)}.sandbox-achievement small,.sandbox-achievement span,.sandbox-achievement strong{display:block}.sandbox-achievement small{color:var(--orange);font-size:7px;font-weight:750;text-transform:uppercase}.sandbox-achievement strong{margin-top:2px;font-size:9px}.sandbox-achievement span{margin-top:2px;color:var(--muted);font-size:7px}.import-limit{display:flex;align-items:flex-start;margin-top:9px;padding:9px;color:var(--muted);gap:7px}.import-limit svg{flex:0 0 auto;color:var(--green)}.import-limit p{margin:0;font-size:8px;line-height:1.45}.sandbox-guide{display:flex;min-height:0;flex:1;align-items:center;justify-content:center;flex-direction:column;padding:28px;overflow-y:auto;text-align:center}.local-assistant{width:min(100%,430px);margin-top:16px;padding:13px;border:1px solid var(--line);border-radius:9px;background:var(--bg-soft);text-align:left}.local-assistant>strong{display:block;color:var(--text);font-size:10px}.command-list{display:flex;margin-top:9px;flex-wrap:wrap;gap:5px}.command-list code{padding:4px 6px;border:1px solid var(--line);border-radius:5px;background:var(--editor);color:var(--blue-bright);font-size:8px}.local-assistant>p,.local-assistant>span{display:block;margin:9px 0 0;color:var(--text-soft);font-size:9px;line-height:1.55}.local-assistant>span{padding-top:9px;border-top:1px solid var(--line-soft)}.guide-visual{position:relative;display:grid;width:80px;height:80px;margin-bottom:18px;place-items:center;border:1px solid rgba(25,105,188,.35);border-radius:24px 8px 24px 8px;background:rgba(25,105,188,.11);color:#6fb4f1}.guide-rings{position:absolute;border:1px solid rgba(235,113,36,.28);border-radius:50%;inset:-8px;transform:rotate(-12deg)}.sandbox-guide>small{color:var(--orange);font-size:8px;font-weight:800;letter-spacing:.12em}.sandbox-guide h1{max-width:280px;margin-top:7px}.guide-features{display:flex;width:100%;flex-direction:column;margin:18px 0;gap:7px}.guide-features div{display:flex;align-items:center;padding:9px 10px;border:1px solid var(--line);border-radius:7px;background:var(--bg-soft);color:var(--text-soft);font-size:9px;text-align:left;gap:8px}.guide-features svg{color:var(--blue-bright)}.guide-run{height:36px;padding:0 17px;border:0;border-radius:7px;background:var(--blue);color:white;font-size:10px;font-weight:700;cursor:pointer;gap:7px}.guide-run,.statusbar{display:flex;align-items:center}.statusbar{justify-content:space-between;padding:0 10px;background:var(--blue-deep);color:rgba(255,255,255,.8);font-size:8px}.statusbar span,.statusbar>div{display:flex;align-items:center;height:100%}.statusbar span{padding:0 8px;gap:4px}.status-brand{margin-left:-10px;background:var(--orange);color:white;font-weight:800;letter-spacing:.05em}.course-drawer-backdrop,.hidden-input,.mobile-tabs{display:none}.workspace>.course-sidebar{grid-column:2}.startup-loader{position:fixed;z-index:300;display:grid;place-items:center;background:radial-gradient(circle at 50% 42%,rgba(25,105,188,.2),transparent 35%),var(--bg);inset:0}.startup-loader-card{width:min(360px,calc(100vw - 40px));text-align:center}.startup-loader .brand{width:-moz-max-content;width:max-content;height:auto;margin:0 auto;padding:0;border:0;justify-content:center}.startup-loader .brand-copy small{display:block}.startup-loader-card>p{margin:24px 0 12px;color:var(--text-soft);font-size:11px}.startup-loader-card>small{display:block;margin-top:10px;color:var(--muted);font-size:8px}.startup-progress{height:4px;overflow:hidden;border-radius:99px;background:var(--line)}.startup-progress span{display:block;width:40%;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--blue),var(--orange))}.welcome-backdrop{position:fixed;z-index:250;display:grid;overflow-y:auto;place-items:center;padding:24px;background:rgba(3,8,14,.76);backdrop-filter:blur(12px);inset:0}.welcome-modal{width:min(820px,100%);padding:30px;border:1px solid rgba(25,105,188,.42);border-radius:20px 8px 20px 8px;background:linear-gradient(145deg,rgba(25,105,188,.14),transparent 36%),var(--panel-strong);box-shadow:0 30px 100px rgba(0,0,0,.48)}.welcome-kicker{display:inline-flex;align-items:center;color:var(--orange);font-size:9px;font-weight:800;letter-spacing:.1em;text-transform:uppercase;gap:6px}.welcome-modal h1{margin:9px 0 0;font-size:clamp(25px,4vw,38px);letter-spacing:-.045em}.welcome-lead{max-width:650px;margin:9px 0 0;color:var(--text-soft);font-size:12px;line-height:1.6}.welcome-modes{display:grid;margin-top:24px;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.welcome-modes article{display:grid;min-height:125px;align-content:start;padding:15px;border:1px solid var(--line);border-radius:10px;background:var(--bg-soft)}.welcome-modes article svg{color:var(--blue-bright)}.welcome-modes strong{margin-top:13px;font-size:11px}.welcome-modes span{margin-top:5px;color:var(--text-soft);font-size:9px;line-height:1.5}.welcome-languages{display:grid;margin-top:11px;grid-template-columns:repeat(4,minmax(0,1fr));gap:7px}.welcome-languages>div{display:flex;align-items:center;padding:10px;border:1px solid var(--line-soft);border-radius:8px;color:var(--orange);gap:8px}.welcome-languages small,.welcome-languages strong{display:block}.welcome-languages strong{color:var(--text);font-size:9px}.welcome-languages small{margin-top:2px;color:var(--muted);font-size:7px;line-height:1.35}.welcome-preference{display:inline-flex;align-items:center;margin-top:18px;color:var(--text-soft);font-size:9px;cursor:pointer;gap:8px}.welcome-preference input{width:16px;height:16px;accent-color:var(--blue)}.welcome-actions{display:flex;margin-top:15px;flex-wrap:wrap;gap:8px}.welcome-actions button{display:inline-flex;min-height:42px;align-items:center;justify-content:center;padding:0 15px;border:1px solid var(--line);border-radius:8px;background:var(--bg-soft);color:var(--text-soft);font-size:10px;font-weight:700;cursor:pointer;gap:7px}.welcome-actions button.primary{border-color:var(--blue);background:var(--blue);color:white}.examples-backdrop{position:fixed;z-index:150;inset:0;display:grid;padding:32px;place-items:center;background:rgba(4,8,14,.78);backdrop-filter:blur(10px)}.examples-modal{display:grid;width:min(1180px,100%);height:min(820px,100%);overflow:hidden;grid-template-rows:64px auto minmax(0,1fr);border:1px solid var(--line);border-radius:16px;background:var(--panel);box-shadow:0 30px 100px rgba(0,0,0,.55)}.examples-modal>.example-details,.examples-modal>.study-view{grid-row:2/-1}.examples-header{display:flex;align-items:center;justify-content:space-between;padding:0 18px;border-bottom:1px solid var(--line);background:linear-gradient(135deg,rgba(25,105,188,.12),transparent 38%),var(--panel-strong)}.examples-header>div{display:flex;align-items:center;min-width:0;gap:11px}.examples-back,.examples-logo{display:grid;width:36px;height:36px;flex:0 0 auto;place-items:center;border:1px solid rgba(25,105,188,.38);border-radius:10px 4px 10px 4px;background:rgba(25,105,188,.14);color:#76b9f2}.examples-back{cursor:pointer}.examples-header h2,.examples-header small{display:block;margin:0}.examples-header small{color:var(--orange);font-size:7px;font-weight:800;letter-spacing:.13em}.examples-header h2{margin-top:3px;font-size:18px;letter-spacing:-.03em}.examples-close{display:grid;width:34px;height:34px;place-items:center;border:1px solid var(--line);border-radius:7px;background:var(--panel);color:var(--muted);cursor:pointer}.achievements-backdrop{position:fixed;z-index:165;inset:0;display:grid;padding:32px;place-items:center;background:rgba(4,8,14,.8);backdrop-filter:blur(12px)}.achievements-modal{width:min(920px,100%);max-height:min(760px,100%);overflow-y:auto;padding:22px;border:1px solid var(--line);border-radius:18px;background:radial-gradient(circle at 85% 0,rgba(235,113,36,.11),transparent 30%),radial-gradient(circle at 8% 0,rgba(25,105,188,.16),transparent 34%),var(--panel);box-shadow:0 32px 110px rgba(0,0,0,.58)}.achievements-header{display:flex;align-items:flex-start;justify-content:space-between;gap:18px}.achievements-header .eyebrow{color:var(--orange);font-size:8px;font-weight:800;letter-spacing:.13em}.achievements-header h2{margin:5px 0 0;font-size:26px;letter-spacing:-.04em}.achievements-header p{margin:5px 0 0;color:var(--text-soft);font-size:10px}.achievements-header .icon-button{display:grid;width:36px;height:36px;flex:0 0 auto;place-items:center;border:1px solid var(--line);border-radius:8px;background:var(--panel-strong);color:var(--text-soft);cursor:pointer}.achievements-progress{height:6px;margin-top:18px;overflow:hidden;border-radius:999px;background:var(--panel-hover)}.achievements-progress span{display:block;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--blue),var(--orange));transition:width .3s ease}.achievements-grid{display:grid;margin-top:18px;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.achievement-card{display:flex;min-height:132px;padding:14px;border:1px solid var(--line);border-radius:11px;background:color-mix(in srgb,var(--bg-soft) 84%,transparent);gap:11px}.achievement-card .achievement-icon{width:42px;height:42px}.achievement-card h3{margin:2px 0 0;font-size:11px}.achievement-card p{margin:6px 0 0;color:var(--text-soft);font-size:9px;line-height:1.5}.achievement-card>div:last-child>span{display:block;margin-top:9px;color:var(--muted);font-size:8px}.achievement-card.is-unlocked{border-color:rgba(235,113,36,.3);background:linear-gradient(145deg,rgba(235,113,36,.08),transparent)}.achievement-card.is-locked{opacity:.62}.achievement-card.is-locked .achievement-icon{background:var(--panel-hover);color:var(--muted)}.examples-controls{display:flex;flex-direction:column;padding:15px 18px 12px;border-bottom:1px solid var(--line);background:var(--bg-soft);gap:10px}.example-search{display:flex;height:38px;align-items:center;padding:0 11px;border:1px solid var(--line);border-radius:8px;background:var(--panel);color:var(--muted);gap:8px}.example-search:focus-within{border-color:var(--blue);box-shadow:0 0 0 3px rgba(25,105,188,.1)}.example-search input{min-width:0;flex:1;border:0;outline:0;background:transparent;color:var(--text);font-size:10px}.example-filter-row{display:flex;align-items:center;color:var(--muted);gap:9px}.example-filter-row>span{min-width:45px;font-size:8px;font-weight:650}.example-filter-row>div{display:flex;flex-wrap:wrap;gap:5px}.example-filter-row button{height:26px;padding:0 9px;border:1px solid var(--line);border-radius:5px;background:transparent;color:var(--muted);font-size:8px;cursor:pointer}.example-filter-row button.active{border-color:rgba(25,105,188,.45);background:var(--blue);color:white}.difficulty-row button.active{border-color:rgba(235,113,36,.42);background:rgba(235,113,36,.14);color:var(--orange-soft)}.examples-results{min-height:0;overflow-y:auto;padding:14px 18px 24px}.examples-count{display:flex;align-items:center;justify-content:space-between;margin-bottom:11px}.examples-count span{color:var(--text-soft);font-size:9px}.examples-count small{color:var(--green);font-size:7px}.examples-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:9px}.example-card{position:relative;display:flex;min-height:180px;flex-direction:column;padding:13px;overflow:hidden;border:1px solid var(--line);border-radius:9px;background:var(--panel-strong)}.example-card:before{position:absolute;top:0;left:0;width:100%;height:2px;background:var(--blue);content:""}.example-card.javascript:before{background:#e9b654}.example-card.react:before{background:#62d9f5}.example-card.p5:before{background:#ed4c83}.example-card:hover{border-color:rgba(25,105,188,.48);transform:translateY(-1px)}.example-card-top{display:flex;align-items:center;justify-content:space-between}.example-card-top span{color:var(--blue-bright);font-size:8px;font-weight:750}.example-card.javascript .example-card-top span{color:var(--yellow)}.example-card.react .example-card-top span{color:#62d9f5}.example-card.p5 .example-card-top span{color:#ed7aa3}.example-card-top small{color:var(--muted);font-size:7px}.example-card h3{margin:10px 0 0;font-size:13px}.example-card p{margin:6px 0 0;color:var(--text-soft);font-size:8px;line-height:1.5}.example-tags{display:flex;flex-wrap:wrap;margin-top:10px;gap:4px}.example-tags span{padding:3px 5px;border-radius:4px;background:var(--bg-soft);color:var(--muted);font-size:7px}.example-card>button{display:flex;width:100%;height:29px;align-items:center;justify-content:center;margin-top:auto;border:1px solid var(--line);border-radius:6px;background:var(--bg-soft);color:var(--text-soft);font-size:8px;cursor:pointer;gap:6px}.example-card>button:hover{border-color:var(--blue);color:var(--text)}.examples-empty{display:flex;min-height:260px;align-items:center;justify-content:center;flex-direction:column;color:var(--muted);text-align:center}.examples-empty strong{margin-top:10px;color:var(--text);font-size:12px}.examples-empty span{margin-top:4px;font-size:8px}.example-details{display:grid;min-height:0;grid-template-columns:minmax(0,1.55fr) minmax(260px,.65fr);overflow:hidden}.example-detail-main,.example-explanation{min-height:0;overflow-y:auto;padding:20px}.example-detail-main{border-right:1px solid var(--line)}.detail-meta{display:flex;gap:6px}.detail-meta span{padding:4px 7px;border:1px solid var(--line);border-radius:5px;color:var(--text-soft);font-size:8px}.detail-description{margin:12px 0 14px;color:var(--text-soft);font-size:10px;line-height:1.6}.detail-code{min-height:420px;margin:0;padding:18px;overflow:auto;border:1px solid var(--line);border-radius:9px;background:var(--editor);color:#dce6f2;font:11px/1.7 var(--font-mono);white-space:pre}.detail-actions{display:flex;margin-top:12px;flex-wrap:wrap;gap:7px}.detail-actions button,.reset-example,.study-button{display:flex;height:34px;align-items:center;padding:0 11px;border:1px solid var(--line);border-radius:7px;background:var(--panel-strong);color:var(--text-soft);font-size:8px;cursor:pointer;gap:6px}.detail-actions .detail-primary{border-color:var(--blue);background:var(--blue);color:white}.example-explanation{background:var(--bg-soft)}.example-explanation>small,.study-explanation>small,.study-steps>small{color:var(--orange);font-size:7px;font-weight:800;letter-spacing:.12em}.example-explanation h3,.study-explanation h3{margin:6px 0 0;font-size:15px}.example-explanation>p,.study-explanation>p{margin:9px 0 0;color:var(--text-soft);font-size:9px;line-height:1.65}.detail-step-preview{display:flex;flex-direction:column;margin:17px 0;gap:6px}.detail-step-preview>div{display:flex;align-items:center;padding:8px;border:1px solid var(--line);border-radius:7px;background:var(--panel);gap:8px}.detail-step-preview>div>span{display:grid;width:23px;height:23px;place-items:center;border-radius:5px;background:rgba(25,105,188,.14);color:var(--blue-bright);font:8px var(--font-mono)}.detail-step-preview small,.detail-step-preview strong{display:block}.detail-step-preview strong{font-size:8px}.detail-step-preview small{margin-top:2px;color:var(--muted);font-size:7px}.reset-example,.study-button{width:100%;justify-content:center}.study-button{border-color:var(--blue);background:var(--blue);color:white}.reset-example{margin-top:7px}.study-view{display:grid;min-height:0;grid-template-columns:205px minmax(0,1fr) 310px;overflow:hidden}.study-code,.study-explanation,.study-steps{min-width:0;min-height:0;overflow-y:auto}.study-steps{padding:18px 12px;border-right:1px solid var(--line);background:var(--bg-soft)}.study-steps>small{display:block;margin:0 7px 12px}.study-steps button{display:flex;width:100%;min-height:48px;align-items:center;padding:7px;border:1px solid transparent;border-radius:7px;background:transparent;color:var(--text-soft);text-align:left;cursor:pointer;gap:8px}.study-steps button.active{border-color:rgba(25,105,188,.35);background:rgba(25,105,188,.12)}.study-steps button>span{display:grid;width:24px;height:24px;place-items:center;border-radius:5px;background:var(--panel-hover);font:8px var(--font-mono)}.study-steps button.active>span{background:var(--blue);color:white}.study-steps button small,.study-steps strong{display:block}.study-steps strong{font-size:8px}.study-steps button small{margin-top:3px;color:var(--muted);font-size:7px}.study-code{display:grid;grid-template-rows:42px minmax(0,1fr);background:var(--editor)}.study-code-head{display:flex;align-items:center;justify-content:space-between;padding:0 14px;border-bottom:1px solid var(--line);background:var(--panel)}.study-code-head strong{font-size:9px}.study-code-head span{color:var(--blue-bright);font-size:8px}.study-code pre{margin:0;padding:15px 0;overflow:auto;color:#9ca9b9;font:10px/1.75 var(--font-mono)}.study-code code{display:grid;min-width:-moz-max-content;min-width:max-content;grid-template-columns:42px minmax(500px,1fr);padding-right:18px;white-space:pre}.study-code code.highlighted{background:rgba(25,105,188,.2);color:#eaf4ff;box-shadow:inset 3px 0 var(--orange)}.study-code code>span{padding-right:10px;color:#526273;text-align:right;-webkit-user-select:none;-moz-user-select:none;user-select:none}.study-explanation{padding:20px;border-left:1px solid var(--line);background:var(--panel-strong)}.study-question{margin-top:19px;padding-top:15px;border-top:1px solid var(--line)}.study-question>strong{display:block;margin-bottom:9px;font-size:9px;line-height:1.45}.study-question>button{display:flex;width:100%;min-height:34px;align-items:center;margin-top:5px;padding:6px 8px;border:1px solid var(--line);border-radius:6px;background:var(--bg-soft);color:var(--text-soft);font-size:8px;text-align:left;cursor:pointer;gap:7px}.study-question>button>span{display:grid;width:19px;height:19px;flex:0 0 auto;place-items:center;border-radius:4px;background:var(--panel-hover);font:7px var(--font-mono)}.study-question>button.correct{border-color:rgba(99,214,171,.45);color:var(--green)}.study-question>button.wrong{border-color:rgba(255,107,107,.4);color:var(--red)}.study-question>p{margin:8px 0 0;padding:8px;border-radius:6px;font-size:8px;line-height:1.5}.answer-correct{background:rgba(99,214,171,.08);color:var(--green)}.answer-wrong{background:rgba(255,107,107,.08);color:var(--red)}.study-nav{display:grid;margin-top:16px;grid-template-columns:1fr 1fr;gap:6px}.study-nav button{min-height:34px;border:1px solid var(--line);border-radius:6px;background:var(--bg-soft);color:var(--text-soft);font-size:8px;cursor:pointer}.study-nav button:last-child{border-color:var(--blue);background:var(--blue);color:white}.study-nav button:disabled{opacity:.4;cursor:default}.toast{position:fixed;z-index:120;right:18px;bottom:38px;display:flex;width:min(340px,calc(100vw - 36px));align-items:flex-start;padding:12px 13px;border:1px solid var(--line);border-radius:9px;background:var(--panel-strong);box-shadow:var(--shadow);color:var(--blue-bright);gap:9px}.toast.success{color:var(--green)}.toast.error{color:var(--red)}.toast span,.toast strong{display:block}.toast strong{color:var(--text);font-size:10px}.toast span{margin-top:3px;color:var(--text-soft);font-size:8px;line-height:1.45}.celebration-backdrop{overflow:hidden}.confetti{position:absolute;top:-30px;width:8px;height:18px;border-radius:2px;background:var(--blue-bright)}.confetti:nth-child(3n){background:var(--orange)}.confetti:nth-child(4n){background:var(--green)}.completion-card{position:relative;z-index:2;width:min(390px,calc(100vw - 32px));padding:31px;border:1px solid rgba(25,105,188,.4);border-radius:18px 7px 18px 7px;background:linear-gradient(145deg,rgba(25,105,188,.15),transparent 42%),var(--panel-strong);box-shadow:0 30px 90px rgba(0,0,0,.46);text-align:center}.completion-medal{display:grid;width:72px;height:72px;margin:0 auto 14px;place-items:center;border:1px solid rgba(235,113,36,.35);border-radius:50%;background:rgba(235,113,36,.11);color:var(--orange);box-shadow:0 0 0 9px rgba(235,113,36,.04)}.completion-card>small{color:var(--blue-bright);font-size:8px;font-weight:800;letter-spacing:.14em}.completion-card h2{margin:6px 0 0;font-size:24px;letter-spacing:-.04em}.completion-card p{margin:8px auto 0;color:var(--text-soft);font-size:10px;line-height:1.6}.xp-award{margin:17px 0;color:var(--orange);font:800 22px var(--font-mono)}.completion-card button{width:100%;height:38px;border:0;border-radius:7px;background:var(--blue);color:white;font-size:10px;font-weight:720;cursor:pointer}@media (max-width:1320px){.workspace{grid-template-columns:48px 210px minmax(410px,1fr) 340px}.workspace.visual-workspace{grid-template-columns:48px 210px minmax(370px,1fr) 8px minmax(420px,var(--preview-width,500px))}.topbar{grid-template-columns:258px 1fr auto}.save-button{display:none}.learning-scroll{padding-right:15px;padding-left:15px}}@media (max-width:1120px){.workspace{grid-template-columns:46px 186px minmax(380px,1fr) 315px}.workspace.visual-workspace{grid-template-columns:46px 186px minmax(350px,1fr) 8px minmax(410px,var(--preview-width,460px))}.topbar{grid-template-columns:232px 1fr auto}.brand-copy small,.detected-language,.top-icon-button{display:none}.mode-switch button{padding:0 9px}.right-column.with-preview .preview-panel{min-height:210px}.security-grid{grid-template-columns:1fr}}@media (min-width:1440px){.workspace{grid-template-columns:52px 252px minmax(520px,1fr) minmax(380px,420px)}.workspace.visual-workspace{grid-template-columns:52px 252px minmax(500px,1fr) 8px minmax(460px,var(--preview-width,580px))}.topbar{grid-template-columns:304px 1fr auto}.learning-scroll{padding-right:22px;padding-left:22px}}@media (max-width:1023px){.app-shell{grid-template-rows:58px minmax(0,1fr) calc(60px + env(safe-area-inset-bottom))}.topbar{grid-template-columns:220px 1fr auto}.brand{border-right:0}.mode-switch{justify-self:start}.mode-switch button{min-width:42px;height:32px;padding:0 10px}.top-actions{padding-right:8px}.detected-language,.examples-top-button,.save-button,.top-icon-button{display:none}.language-select,.run-button,.stop-button{min-height:40px}.workspace{position:relative;display:block;min-height:0}.activity-rail,.workspace-splitter,.workspace>.course-sidebar{display:none}.editor-column{width:100%;height:100%;grid-template-rows:42px minmax(0,1fr);border-right:0}.editor-column .output-panel{display:none}.right-column{display:none;width:100%;height:100%;border-right:0}.mobile-view-lesson .editor-column,.mobile-view-result .editor-column{display:none}.mobile-view-lesson .right-column,.mobile-view-result .right-column{display:flex}.mobile-view-result .right-column.with-preview .preview-panel{display:grid;width:100%;height:100%;min-height:0;border-bottom:0}.mobile-view-result .preview-stage{padding:5px}.mobile-view-result .preview-stage iframe{border-radius:5px}.mobile-view-lesson .right-column .preview-panel,.mobile-view-result .right-column.with-preview .learning-panel,.mobile-view-result .right-column.with-preview .sandbox-guide{display:none}.mobile-view-lesson .right-column.with-preview .learning-panel,.mobile-view-lesson .right-column.with-preview .sandbox-guide{display:grid;width:100%;height:100%}.mobile-view-console .editor-column{grid-template-rows:minmax(0,1fr)}.mobile-view-console .editor-area,.mobile-view-console .editor-toolbar{display:none}.mobile-view-console .editor-column .output-panel{display:grid;height:100%;border-top:0}.mobile-tabs{z-index:60;display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line);background:var(--panel-strong);padding-bottom:env(safe-area-inset-bottom)}.mobile-tabs button{position:relative;display:flex;min-width:0;align-items:center;justify-content:center;flex-direction:column;border:0;background:transparent;color:var(--muted);font-size:9px;cursor:pointer;gap:3px}.mobile-tabs button.active{color:#75b9f2}.mobile-tabs button.active:before{position:absolute;top:0;right:26%;left:26%;height:2px;background:var(--orange);content:""}.statusbar{display:none}.course-drawer-backdrop{position:fixed;z-index:140;inset:0;display:flex;align-items:end;background:rgba(3,8,14,.7);backdrop-filter:blur(6px)}.course-drawer{display:grid;width:100%;height:min(82dvh,780px);min-height:0;grid-template-rows:18px 44px minmax(0,1fr);overflow:hidden;border-top:1px solid var(--line);border-radius:18px 18px 0 0;background:var(--panel);box-shadow:0 -20px 70px rgba(0,0,0,.4)}.drawer-handle{width:42px;height:4px;align-self:center;justify-self:center;border-radius:8px;background:var(--line)}.drawer-head{display:flex;align-items:center;justify-content:space-between;padding:0 14px;border-bottom:1px solid var(--line)}.drawer-head strong{font-size:12px}.drawer-head button{display:grid;width:36px;height:36px;place-items:center;border:0;border-radius:7px;background:var(--panel-hover);color:var(--text-soft)}.course-drawer .course-sidebar{display:flex;min-height:0;border-right:0}.course-drawer .lesson-row,.course-drawer .track-switch button{min-height:42px;font-size:12px}.course-drawer .lesson-state{width:25px;height:25px}.examples-backdrop{padding:18px}.examples-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.example-details{grid-template-columns:minmax(0,1fr) 300px}.study-view{grid-template-columns:175px minmax(0,1fr) 280px}}@media (max-width:767px){.app-shell{grid-template-rows:98px minmax(0,1fr) calc(60px + env(safe-area-inset-bottom))}.topbar{display:grid;height:98px;grid-template-columns:minmax(0,1fr) auto;grid-template-rows:52px 46px}.brand{min-width:0;padding:0 10px;gap:8px}.brand-mark{width:27px;height:27px;transform:scale(.88) skewX(-12deg)}.brand-title strong{font-size:14px}.brand-copy small,.brand-title span{display:none}.mode-switch{grid-row:2;grid-column:1/-1;justify-self:stretch;height:38px;margin:0 8px 8px}.mode-switch button{min-width:0;flex:1;min-height:32px;font-size:10px}.top-actions{grid-row:1;grid-column:2;padding:0 8px 0 0;gap:5px}.language-select{width:92px;min-height:40px;padding:0}.language-select select{width:100%;padding:0 20px 0 26px;font-size:10px}.run-button{min-width:42px;font-size:0}.run-button,.stop-button{height:40px;justify-content:center;padding:0 10px}.stop-button{min-width:106px;font-size:10px}.run-button svg,.stop-button svg{width:17px;height:17px}.editor-toolbar{min-height:42px}.file-tab{min-width:132px;padding:0 9px;font-size:9px}.editor-tools>button,.more-menu-wrap>button{width:36px;height:36px}.editor-tools>button:first-child,.editor-tools>button:nth-child(3){display:none}.output-tabs{min-height:43px}.output-tabs button{min-height:42px;padding:0 10px;font-size:9px}.output-body{padding:13px;font-size:11px}.console-input>div{grid-template-columns:1fr}.console-input button{width:100%}.learning-tabs{min-height:44px}.learning-tabs button{min-height:43px;font-size:10px}.learning-scroll{padding:18px 15px 102px}.lesson-hero h1,.sandbox-guide h1,.security-hero h1{font-size:24px}.lesson-hero p,.lesson-section p,.sandbox-guide>p,.security-hero p{font-size:12px}.task-card h2{font-size:16px}.criteria-list li,.hint-text,.hint-zone>p{font-size:11px}.lesson-assistant-actions button,.local-assistant-actions button,.why-error-button{min-height:40px;padding:0 12px;font-size:10px}.lesson-assistant-answer p,.local-assistant>p,.local-assistant>span,.why-error-answer{font-size:11px}.command-list code{font-size:10px}.check-button,.guide-run,.secondary-action{min-height:44px;font-size:11px}.preview-toolbar{min-height:44px;padding:0 7px 0 10px}.preview-toolbar strong{font-size:10px}.icon-text-button{width:36px;min-height:34px;justify-content:center;padding:0;overflow:hidden;font-size:0}.preview-stage{padding:3px}.preview-stage iframe{border:0;border-radius:3px}.sandbox-guide{padding:22px 18px}.guide-features div{min-height:44px;font-size:10px}.welcome-backdrop{align-items:start;padding:10px}.welcome-modal{margin:8px 0;padding:20px 15px;border-radius:14px}.welcome-lead{font-size:11px}.welcome-modes{grid-template-columns:1fr;margin-top:17px}.welcome-modes article{min-height:0;grid-template-columns:24px minmax(0,1fr);padding:12px;-moz-column-gap:8px;column-gap:8px}.welcome-modes strong{margin-top:0}.welcome-modes span{grid-column:2}.welcome-languages{grid-template-columns:repeat(2,minmax(0,1fr))}.welcome-actions{display:grid;grid-template-columns:1fr}.welcome-actions button{width:100%;min-height:46px}.achievements-backdrop,.examples-backdrop{padding:0}.achievements-modal{width:100%;max-height:100%;min-height:100%;padding:18px 14px 28px;border:0;border-radius:0}.achievements-header h2{font-size:23px}.achievements-grid{grid-template-columns:1fr}.achievement-card{min-height:112px}.examples-modal{width:100%;height:100%;border:0;border-radius:0}.examples-header{min-height:64px;padding:0 13px}.examples-controls{padding:12px}.example-search{min-height:44px}.example-search input{font-size:12px}.examples-count small{display:none}.example-filter-row{align-items:flex-start;overflow-x:auto}.example-filter-row>div{min-width:-moz-max-content;min-width:max-content;flex-wrap:nowrap}.example-filter-row button{min-height:34px;padding:0 11px;font-size:9px}.examples-results{padding:12px}.examples-grid{grid-template-columns:1fr}.example-card{min-height:168px}.example-card h3{font-size:15px}.example-card p{font-size:10px}.example-card>button{min-height:40px;font-size:10px}.example-details{display:block;overflow-y:auto}.example-detail-main,.example-explanation{overflow:visible;padding:14px}.example-detail-main{border-right:0}.detail-code{min-height:300px;font-size:10px}.detail-actions{display:grid;grid-template-columns:1fr}.detail-actions button,.reset-example,.study-button{min-height:44px;justify-content:center;font-size:10px}.example-explanation{border-top:1px solid var(--line)}.study-view{display:block;overflow-y:auto}.study-code,.study-explanation,.study-steps{overflow:visible}.study-steps{display:flex;padding:10px;overflow-x:auto;border-right:0;border-bottom:1px solid var(--line);gap:5px}.study-steps>small{display:none}.study-steps button{min-width:145px;min-height:48px}.study-code{height:370px}.study-explanation{padding:16px;border-top:1px solid var(--line);border-left:0}.study-nav button,.study-question>button{min-height:44px;font-size:10px}.completion-card,.confirm-dialog{width:calc(100vw - 24px);padding:22px 17px}.dialog-actions{grid-template-columns:1fr}.dialog-actions button{min-height:44px}.toast{right:12px;bottom:72px;width:calc(100vw - 24px)}}.achievement-card,.lesson-row,.mobile-tabs button:before,.preview-panel,button{transition:transform .15s ease,color .15s ease,background-color .15s ease,border-color .15s ease,box-shadow .18s ease,opacity .15s ease}@media (hover:hover){button:not(:disabled):hover{transform:translateY(-1px)}}button:not(:disabled):active{transform:translateY(0) scale(.985)}.mode-switch button{position:relative;isolation:isolate}.mode-switch button.active{animation:mode-select .26s cubic-bezier(.2,.8,.25,1)}.lesson-row.selected{animation:lesson-select .26s ease-out}.lesson-row.selected .lesson-state{box-shadow:0 0 0 4px rgba(25,105,188,.09)}.run-button{position:relative;overflow:hidden}.run-button:after{position:absolute;width:48%;height:130%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.22),transparent);content:"";opacity:0;transform:translateX(-170%) skewX(-18deg)}.run-button:hover:after{opacity:1;transform:translateX(360%) skewX(-18deg);transition:transform .46s ease,opacity .1s ease}.preview-spinner{flex:0 0 auto;animation:soft-spin .85s linear infinite}.output-panel.is-success .output-status{animation:success-pulse .56s ease-out}.diagnostic.error{animation:diagnostic-arrival .28s ease-out}.preview-spinner{color:var(--blue-bright)}.preview-empty.has-error{color:var(--red)}.preview-empty.has-error p{color:var(--text-soft)}.right-column.with-result-placeholder .result-placeholder-panel{height:175px;flex:0 0 auto;border-bottom:1px solid var(--line)}.result-placeholder-panel .preview-stage{padding:4px}.result-placeholder-panel .preview-empty{padding:14px}.student-progress-summary{display:grid;margin-top:18px;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}.student-progress-summary article{min-height:88px;padding:12px;border:1px solid var(--line);border-radius:10px;background:var(--bg-soft)}.student-progress-summary small,.student-progress-summary span,.student-progress-summary strong{display:block}.student-progress-summary small{color:var(--muted);font-size:8px}.student-progress-summary strong{margin-top:6px;color:var(--text);font:800 15px var(--font-onest)}.student-progress-summary span{margin-top:4px;color:var(--text-soft);font-size:8px;line-height:1.4}.teacher-progress-note{margin:11px 0 0;padding:9px 11px;border-left:2px solid var(--blue);background:rgba(25,105,188,.07);color:var(--text-soft);font-size:9px;line-height:1.5}.achievement-section-title{display:flex;align-items:center;justify-content:space-between;margin-top:18px}.achievement-section-title strong{color:var(--text);font-size:12px}.achievement-section-title span{color:var(--muted);font-size:8px}.achievement-card.is-unlocked{box-shadow:inset 0 1px 0 rgba(255,255,255,.04),0 10px 22px rgba(235,113,36,.06)}.achievement-card.is-unlocked:hover{border-color:rgba(235,113,36,.52);box-shadow:0 0 0 3px rgba(235,113,36,.08),0 12px 28px rgba(235,113,36,.09)}.latest-achievement{color:var(--muted)!important}.status-progress-button{position:relative;display:flex;height:100%;align-items:center;padding:0 8px;border:0;background:transparent;color:rgba(255,255,255,.92);font:inherit;cursor:pointer}.status-progress-button:hover{background:rgba(255,255,255,.1)}.xp-float{position:absolute;top:-12px;right:3px;color:#9af0ca;font:800 9px var(--font-mono);pointer-events:none;white-space:nowrap}.level-up-card{border-color:rgba(235,113,36,.5)}.welcome-security{margin:14px 0 0;padding:9px 11px;border:1px solid rgba(99,214,171,.22);border-radius:8px;background:rgba(99,214,171,.06)}.welcome-progress-note,.welcome-security{color:var(--text-soft);font-size:9px;line-height:1.5}.welcome-progress-note{margin:10px 0 0}.startup-loader .brand-mark{animation:startup-mark 1.1s cubic-bezier(.22,.8,.32,1) infinite alternate}.mobile-tabs button.active:before{animation:mobile-tab-select .22s ease-out}@keyframes mode-select{0%{transform:scale(.96)}to{transform:scale(1)}}@keyframes lesson-select{0%{transform:translateX(-3px);opacity:.72}to{transform:translateX(0);opacity:1}}@keyframes success-pulse{0%{transform:scale(.92);opacity:.55}65%{transform:scale(1.08);opacity:1}to{transform:scale(1)}}@keyframes diagnostic-arrival{0%{transform:translateX(-3px)}45%{transform:translateX(3px)}to{transform:translateX(0)}}@keyframes soft-spin{to{transform:rotate(1turn)}}@keyframes startup-mark{0%{transform:skewX(-12deg) translateY(0);filter:drop-shadow(0 0 0 rgba(25,105,188,0))}to{transform:skewX(-12deg) translateY(-2px);filter:drop-shadow(0 5px 9px rgba(25,105,188,.38))}}@keyframes mobile-tab-select{0%{transform:scaleX(.3);opacity:.2}to{transform:scaleX(1);opacity:1}}@media (max-width:1023px){.right-column.with-result-placeholder .result-placeholder-panel{height:100%}.student-progress-summary{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (max-width:767px){.student-progress-summary{grid-template-columns:1fr}.student-progress-summary article{min-height:76px}.graphic-preview-frame{grid-template-columns:1fr}.graphic-preview-frame img,.graphic-preview-frame svg{width:min(100%,220px)}.welcome-security{font-size:10px}}@media (prefers-reduced-motion:reduce){*,:after,:before{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}.explicit-export{width:auto!important;gap:5px;padding:0 8px!important;font-size:11px}.content-update-error{position:fixed;top:0;left:0;right:0;z-index:9999;background:#59451a;color:#fff4d6;padding:7px;text-align:center;font-size:12px}.app-shell.is-learning{--course-inset:288px;grid-template-rows:58px 60px minmax(0,1fr) 24px}.reference-toolbar button,.theory-to-practice,.walkthrough-launch{display:inline-flex;align-items:center;justify-content:center;gap:7px;border:1px solid var(--line);border-radius:7px;padding:8px 11px;background:var(--panel);color:var(--text);cursor:pointer;font-size:12px}.reference-toolbar button:hover,.walkthrough-launch:hover{background:var(--panel-hover)}.lesson-mode-tabs{display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);align-items:stretch;gap:12px;padding:7px 18px 7px calc(var(--course-inset) + 18px);border-bottom:1px solid var(--line);background:var(--bg-soft);min-width:0}.lesson-mode-switch{grid-column:2;display:flex;align-items:stretch;gap:6px}.lesson-mode-tabs button{display:flex;align-items:center;justify-content:center;gap:9px;min-width:140px;min-height:44px;font-size:16px;font-weight:650;padding:0 22px;border:1px solid transparent;border-radius:6px;background:transparent;color:var(--text-soft);cursor:pointer}.lesson-mode-tabs button[aria-selected=true]{background:var(--panel);border-color:var(--line);color:var(--text);box-shadow:inset 0 -2px var(--orange)}.lesson-tab-title{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;align-self:center;justify-self:end;max-width:100%;color:var(--text-soft);font-size:12px}.full-theory{grid-column:3/-1;min-width:0;overflow:auto;background:var(--panel);padding:clamp(22px,4vw,56px)}.full-theory[hidden]{display:none}.full-theory article{max-width:780px;margin:0 auto;animation:theory-enter .16s ease-out}.full-theory h1{margin:12px 0 24px;font-size:clamp(24px,3vw,36px);line-height:1.2}.theory-to-practice{margin-top:28px;background:var(--blue);color:#fff;border-color:var(--blue);min-height:44px}.showing-theory .workspace>.editor-column,.showing-theory .workspace>.right-column,.showing-theory .workspace>.workspace-splitter{display:none}.reference-toolbar{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:10px 14px;border-bottom:1px solid var(--line);color:var(--text-soft);font-size:12px}.learning-panel:has(>.reference-toolbar){grid-template-rows:auto minmax(0,1fr)}.lesson-level[style] .level-title{border-left:3px solid var(--section-accent,transparent);padding-left:7px}.lesson-level[style] .level-title>svg{color:var(--section-accent,var(--muted))}@keyframes theory-enter{0%{opacity:.65;transform:translateY(4px)}to{opacity:1;transform:none}}@media (min-width:1024px){.workspace.theory-expanded{grid-template-columns:50px 210px minmax(240px,.7fr) minmax(0,1.3fr)}.workspace.theory-expanded.visual-workspace{grid-template-columns:50px 210px minmax(240px,.7fr) 8px minmax(0,1.3fr)}.theory-expanded .right-column.with-preview .preview-panel{height:28%;min-height:150px}.theory-expanded .right-column.with-preview .learning-panel{height:72%}}@media (min-width:1440px){.app-shell.is-learning{--course-inset:304px}}@media (max-width:1320px){.app-shell.is-learning{--course-inset:258px}}@media (max-width:1120px){.app-shell.is-learning{--course-inset:232px}.walkthrough-launch span{display:none}}@media (max-width:1023px){.app-shell.is-learning{--course-inset:0px;grid-template-rows:58px 60px minmax(0,1fr) calc(60px + env(safe-area-inset-bottom))}.full-theory{height:100%;padding:24px 20px}.lesson-mode-tabs{padding-inline:8px}.lesson-mode-tabs button{padding-inline:16px;min-width:120px;font-size:15px}.lesson-tab-title{display:none}.theory-expanded .reference-toolbar{flex-wrap:wrap}.app-shell:not(.showing-theory) .workspace.theory-expanded{display:grid;grid-template-columns:1fr;grid-template-rows:minmax(120px,28%) minmax(0,1fr)}.app-shell:not(.showing-theory) .theory-expanded>.editor-column{display:grid;grid-column:1;grid-row:1}.app-shell:not(.showing-theory) .theory-expanded>.right-column{display:flex;grid-column:1;grid-row:2}.theory-expanded .right-column .preview-panel{display:none}.theory-expanded .right-column.with-preview .learning-panel{display:grid;height:100%}}@media (max-width:767px){.app-shell.is-learning{grid-template-rows:98px 60px minmax(0,1fr) calc(60px + env(safe-area-inset-bottom))}.walkthrough-launch{padding:8px}.welcome-actions{flex-wrap:wrap}}@media (prefers-reduced-motion:reduce){.full-theory article{animation:none}}