.course-sidebar.course-drawer{position:fixed;inset:0 auto 0 0;width:min(300px,calc(100vw - 24px));max-width:none;height:100dvh;max-height:none;margin:0;border:0;border-radius:0;color:var(--fls-text);overscroll-behavior:contain;box-shadow:var(--fls-shadow)}.course-sidebar.course-drawer:not([open]){display:none}.course-sidebar.course-drawer[open]{display:flex}.course-sidebar.course-drawer::backdrop{background:#0004}.course-drawer-header{display:flex;align-items:center;justify-content:space-between;flex-shrink:0;gap:12px;margin-bottom:22px}.course-drawer-header h2{margin:0;font-size:15px}.course-drawer-header button{display:grid;place-items:center;min-width:36px;min-height:36px}/*! tailwindcss v4.3.3 | MIT License | https://tailwindcss.com */@layer properties{@supports (((-webkit-hyphens:none)) and (not (margin-trim:inline))) or ((-moz-orient:inline) and (not (color:rgb(from red r g b)))){*,:before,:after,::backdrop{--tw-rotate-x:initial;--tw-rotate-y:initial;--tw-rotate-z:initial;--tw-skew-x:initial;--tw-skew-y:initial;--tw-border-style:solid;--tw-outline-style:solid;--tw-blur:initial;--tw-brightness:initial;--tw-contrast:initial;--tw-grayscale:initial;--tw-hue-rotate:initial;--tw-invert:initial;--tw-opacity:initial;--tw-saturate:initial;--tw-sepia:initial;--tw-drop-shadow:initial;--tw-drop-shadow-color:initial;--tw-drop-shadow-alpha:100%;--tw-drop-shadow-size:initial}}}@layer theme{:root,:host{--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";--font-mono:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;--default-transition-duration:.15s;--default-transition-timing-function:cubic-bezier(.4, 0, .2, 1);--default-font-family:var(--font-sans);--default-mono-font-family:var(--font-mono)}}@layer base{*,:after,:before,::backdrop{box-sizing:border-box;border:0 solid;margin:0;padding:0}::file-selector-button{box-sizing:border-box;border:0 solid;margin:0;padding:0}html,:host{-webkit-text-size-adjust:100%;-moz-tab-size:4;tab-size:4;line-height:1.5;font-family:var(--default-font-family,-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji");font-feature-settings:var(--default-font-feature-settings,normal);font-variation-settings:var(--default-font-variation-settings,normal);-webkit-tap-highlight-color:transparent}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;-webkit-text-decoration:inherit;text-decoration:inherit}b,strong{font-weight:bolder}code,kbd,samp,pre{font-family:var(--default-mono-font-family,ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace);font-feature-settings:var(--default-mono-font-feature-settings,normal);font-variation-settings:var(--default-mono-font-variation-settings,normal);font-size:1em}small{font-size:80%}sub,sup{vertical-align:baseline;font-size:75%;line-height:0;position:relative}sub{bottom:-.25em}sup{top:-.5em}table{text-indent:0;border-color:inherit;border-collapse:collapse}:-moz-focusring:where(:not(iframe)){outline:auto}progress{vertical-align:baseline}summary{display:list-item}ol,ul,menu{list-style:none}img,svg,video,canvas,audio,iframe,embed,object{vertical-align:middle;display:block}img,video{max-width:100%;height:auto}button,input,select,optgroup,textarea{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}::file-selector-button{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}:where(select:is([multiple],[size])) optgroup{font-weight:bolder}:where(select:is([multiple],[size])) optgroup option{padding-inline-start:20px}::file-selector-button{margin-inline-end:4px}::placeholder{opacity:1}@supports (not ((-webkit-appearance:-apple-pay-button))) or (contain-intrinsic-size:1px){::placeholder{color:currentColor}@supports (color:color-mix(in lab,red,red)){::placeholder{color:color-mix(in oklab,currentcolor 50%,transparent)}}}textarea{resize:vertical}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-date-and-time-value{min-height:1lh;text-align:inherit}::-webkit-datetime-edit{display:inline-flex}::-webkit-datetime-edit-fields-wrapper{padding:0}::-webkit-datetime-edit{padding-block:0}::-webkit-datetime-edit-year-field{padding-block:0}::-webkit-datetime-edit-month-field{padding-block:0}::-webkit-datetime-edit-day-field{padding-block:0}::-webkit-datetime-edit-hour-field{padding-block:0}::-webkit-datetime-edit-minute-field{padding-block:0}::-webkit-datetime-edit-second-field{padding-block:0}::-webkit-datetime-edit-millisecond-field{padding-block:0}::-webkit-datetime-edit-meridiem-field{padding-block:0}::-webkit-calendar-picker-indicator{line-height:1}:-moz-ui-invalid{box-shadow:none}button,input:where([type=button],[type=reset],[type=submit]){-webkit-appearance:button;-moz-appearance:button;appearance:button}::file-selector-button{-webkit-appearance:button;-moz-appearance:button;appearance:button}::-webkit-inner-spin-button{height:auto}::-webkit-outer-spin-button{height:auto}[hidden]:where(:not([hidden=until-found])){display:none!important}}@layer components;@layer utilities{.\!visible{visibility:visible!important}.visible{visibility:visible}.sr-only{clip-path:inset(50%);white-space:nowrap;border-width:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.absolute{position:absolute}.fixed{position:fixed}.relative{position:relative}.static{position:static}.container{width:100%}@media(min-width:40rem){.container{max-width:40rem}}@media(min-width:48rem){.container{max-width:48rem}}@media(min-width:64rem){.container{max-width:64rem}}@media(min-width:80rem){.container{max-width:80rem}}@media(min-width:96rem){.container{max-width:96rem}}.block{display:block}.contents{display:contents}.flex{display:flex}.grid{display:grid}.hidden{display:none}.inline{display:inline}.table{display:table}.transform{transform:var(--tw-rotate-x,) var(--tw-rotate-y,) var(--tw-rotate-z,) var(--tw-skew-x,) var(--tw-skew-y,)}.resize{resize:both}.flex-wrap{flex-wrap:wrap}.border{border-style:var(--tw-border-style);border-width:1px}.outline{outline-style:var(--tw-outline-style);outline-width:1px}.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,outline-color,text-decoration-color,fill,stroke,--tw-gradient-from,--tw-gradient-via,--tw-gradient-to,opacity,box-shadow,transform,translate,scale,rotate,filter,-webkit-backdrop-filter,backdrop-filter,display,content-visibility,overlay,pointer-events;transition-timing-function:var(--tw-ease,var(--default-transition-timing-function));transition-duration:var(--tw-duration,var(--default-transition-duration))}}:root{color-scheme:light;--fls-bg:#f7f8f5;--fls-surface:#fff;--fls-rail:#f0f2ec;--fls-text:#263a32;--fls-text-muted:#5b6857;--fls-border:#e1e6dc;--fls-control-border:#798675;--fls-accent:#244d3d;--fls-soft:#e4eddd;--fls-on-accent:#fff;--fls-danger:#a83232;--fls-danger-bg:#fff2f0;--fls-code:#f4f6f1;--fls-shadow:0 12px 36px #263a3210;color:var(--fls-text);background:var(--fls-bg);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;font-size:14px;line-height:1.65}:root[data-theme=dark]{color-scheme:dark;--fls-bg:#17201c;--fls-surface:#1e2a24;--fls-rail:#1a251f;--fls-text:#e4ece0;--fls-text-muted:#b4c1ad;--fls-border:#34483c;--fls-control-border:#83957c;--fls-accent:#c0d9ac;--fls-soft:#314837;--fls-on-accent:#17201c;--fls-danger:#ffb5a9;--fls-danger-bg:#412725;--fls-code:#17201c;--fls-shadow:0 12px 36px #0003}*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer;color:inherit}button:disabled{cursor:not-allowed;opacity:.55}a{color:inherit;text-decoration:none}button{background:0 0;border:1px solid #0000;border-radius:7px;padding:6px 10px}button:hover,a:hover{color:var(--fls-accent)}button:hover{background:var(--fls-soft)}:focus-visible{outline:3px solid var(--fls-accent);outline-offset:3px}[hidden]{display:none!important}h1,h2,h3,p{margin:0}svg{flex-shrink:0}input,textarea,select{color:var(--fls-text);border:1px solid var(--fls-control-border);background:var(--fls-surface);border-radius:6px;padding:7px 10px}input[type=radio],input[type=checkbox]{accent-color:var(--fls-accent)}kbd{border:1px solid var(--fls-border);color:var(--fls-text-muted);border-radius:4px;padding:2px 4px;font:10px/1.4 ui-monospace,monospace}.sr-only{clip:rect(0,0,0,0);width:1px;height:1px;position:absolute;overflow:hidden}.skip-link{z-index:100;background:var(--fls-accent);color:var(--fls-on-accent);padding:10px;position:fixed;top:10px;left:20px;transform:translateY(-200%)}.skip-link:focus{transform:none}.primary{background:var(--fls-accent);color:var(--fls-on-accent);border-radius:7px;align-items:center;gap:7px;padding:9px 16px;display:inline-flex}.primary:hover{background:var(--fls-accent);color:var(--fls-on-accent);filter:brightness(1.1)}.muted{color:var(--fls-text-muted)}.eyebrow{color:var(--fls-text-muted);letter-spacing:.16em;margin-bottom:14px;font:10px/1.5 ui-monospace,monospace}.studio-shell{grid-template-columns:var(--sidebar-width,232px) 5px minmax(0,1fr);height:100dvh;display:grid;overflow:hidden}.course-sidebar{background:var(--fls-rail);flex-direction:column;min-height:0;padding:27px 17px 20px;display:flex;overflow:auto}.brand{align-items:center;gap:10px;margin:0 5px 33px;display:flex}.brand-mark{background:var(--fls-accent);width:36px;height:36px;color:var(--fls-on-accent);letter-spacing:-3px;border-radius:11px;place-items:center;font:24px Georgia,serif;display:grid}.brand strong,.brand small{display:block}.brand strong{font-size:13px}.brand small{letter-spacing:.07em;color:var(--fls-text-muted);font:7px/2 ui-monospace,monospace}.space-switch{background:var(--fls-soft);border:1px solid var(--fls-border);border-radius:9px;margin-bottom:20px}.space-switch summary{cursor:pointer;align-items:center;gap:10px;padding:10px 12px;font-weight:600;display:flex}.space-switch summary>svg:last-child{margin-left:auto}.space-switch nav{padding:0 12px 10px;display:grid}.space-switch nav a{justify-content:space-between;padding:6px;display:flex}.course-search{align-items:center;margin-bottom:27px;display:flex;position:relative}.course-search input{background:0 0;width:100%;padding:8px 28px 8px 10px;font-size:12px}.course-search kbd{position:absolute;right:7px}.nav-eyebrow{letter-spacing:.1em;color:var(--fls-text-muted);margin-bottom:12px;padding:0 7px;font-size:10px}.lesson-tree details{margin-bottom:23px}.lesson-tree summary{cursor:pointer;align-items:center;gap:8px;padding:6px;font-size:12px;font-weight:600;display:flex}.lesson-tree summary>span{color:var(--fls-text-muted);font:10px ui-monospace,monospace}.lesson-tree summary>svg{margin-left:auto}.lesson-tree a{color:var(--fls-text-muted);border-radius:7px;align-items:flex-start;gap:10px;margin:5px 0;padding:10px 8px 10px 17px;font-size:12px;line-height:1.6;display:flex}.lesson-tree a>svg{margin-top:5px}.directory-lesson-label{min-width:0}.directory-lesson-label small{font-size:10px;font-weight:400;display:block}.lesson-tree a[aria-current]{background:var(--fls-soft);color:var(--fls-accent);font-weight:600}.lesson-tree .module-quiz{padding-left:38px;font-size:10px}.sidebar-bottom{margin-top:auto;padding:25px 8px 0}.sidebar-bottom>p{color:var(--fls-text-muted);margin-bottom:20px;font:21px/1.8 Songti SC,STSong,Georgia,serif}.sidebar-bottom>a{gap:10px;padding:7px 0;font-size:12px;display:flex}.sidebar-bottom>small{color:var(--fls-text-muted);border-top:1px solid var(--fls-border);margin-top:17px;padding-top:17px;font-size:10px;display:block}.splitter{cursor:col-resize;background:var(--fls-control-border);touch-action:none;width:5px}.sidebar-resize>.splitter{height:100%}.splitter:hover,.splitter:focus,.splitter[data-dragging]{background:var(--fls-accent)}.workspace-splitter{background:0 0;flex-shrink:0;width:12px;position:relative}.workspace-splitter:after{content:"";background:var(--fls-control-border);pointer-events:none;border-radius:4px;position:absolute;top:40%;right:4px;bottom:40%;left:4px}.workspace-splitter:hover,.workspace-splitter:focus-visible,.workspace-splitter[data-dragging]{background:var(--fls-soft)}.workspace-splitter:hover:after,.workspace-splitter:focus-visible:after,.workspace-splitter[data-dragging]:after{background:var(--fls-accent)}.workspace-splitter[aria-orientation=horizontal]{cursor:row-resize;width:100%;height:12px}.workspace-splitter[aria-orientation=horizontal]:after{top:4px;right:40%;bottom:4px;left:40%}.studio-main{flex-direction:column;min-width:0;min-height:0;display:flex}.studio-header{border-bottom:1px solid var(--fls-border);flex-shrink:0;justify-content:space-between;align-items:center;gap:16px;height:74px;padding:0 28px;display:flex}.breadcrumb{gap:13px;font-size:12px;display:flex}.breadcrumb>span{color:var(--fls-text-muted)}.header-tools{align-items:center;gap:19px;display:flex}.progress-chip{color:var(--fls-text-muted);align-items:center;gap:10px;font-size:10px;display:flex}progress{width:64px;height:4px;accent-color:var(--fls-accent)}.save-indicator{color:var(--fls-text-muted);font-size:10px}.save-indicator.error{color:var(--fls-danger)}.menu-button,.drawer-backdrop{display:none}.workspace-content{flex:1;min-height:0;overflow:auto}.learn-page{grid-template-columns:minmax(360px,1.08fr) 12px minmax(320px,1fr);gap:0;height:100%;padding:24px;display:grid}.lesson-body{flex-direction:column;flex:1;min-height:0;display:flex}.stacked-learning .lesson-body{display:grid}.stacked-learning .reading-pane{min-height:0;display:block}.stacked-learning .editing-pane{display:flex;overflow:auto}.learning-panel,.preview-panel{border:1px solid var(--fls-border);background:var(--fls-surface);border-radius:12px;flex-direction:column;min-width:0;min-height:0;display:flex;overflow:hidden}.panel-bar{border-bottom:1px solid var(--fls-border);flex-shrink:0;justify-content:space-between;align-items:center;gap:8px;height:52px;padding:9px 12px;display:flex}.segmented{gap:3px;display:flex}.segmented button{color:var(--fls-text-muted);white-space:nowrap;align-items:center;gap:6px;padding:6px 9px;font-size:12px;display:flex}.segmented button.selected{background:var(--fls-soft);color:var(--fls-accent)}.chapter-label,.runtime-label{color:var(--fls-text-muted);white-space:nowrap;font:9px ui-monospace,monospace}.reading-pane{flex:1;display:none;overflow:auto}.lesson-navigation{border-bottom:1px solid var(--fls-border);flex-shrink:0;justify-content:space-between;align-items:center;gap:8px;padding:8px 14px;font-size:11px;display:flex}.lesson-navigation a,.lesson-navigation>span{align-items:center;gap:4px;display:inline-flex}.lesson-navigation [aria-disabled]{color:var(--fls-text-muted)}.lesson-navigation a{color:var(--fls-accent)}.lesson-outline{border:1px solid var(--fls-border);border-radius:8px;margin:16px 0;padding:12px}.lesson-outline summary{cursor:pointer;font-weight:600}.lesson-outline nav{gap:8px;margin-top:12px;display:grid}.lesson-outline a{color:var(--fls-accent);overflow-wrap:anywhere}.anchored-heading{scroll-margin-top:16px}.heading-anchor{color:var(--fls-text-muted);margin-left:8px;font-size:.8em}.example-target{flex-wrap:wrap;align-items:center;gap:12px;margin:16px 0;display:flex}.example-target select{background:var(--fls-surface);min-width:0;max-width:100%;color:var(--fls-text);border:1px solid var(--fls-border);border-radius:6px;padding:8px}.code-example .example-note{color:var(--fls-text-muted);margin:0;padding:6px 12px;font:11px/1.7 system-ui}.code-example-bar{flex-wrap:wrap}.code-example-bar>span{overflow-wrap:anywhere;min-width:0}.code-example-bar>div{flex-wrap:wrap;gap:8px;display:flex}.code-example-bar small{color:var(--fls-text-muted);font-size:9px}.example-line{border-left:3px solid #0000;padding-left:7px}.example-line.is-highlighted{background:var(--fls-soft);border-left-color:var(--fls-accent)}.reading-pane.is-active{display:block}.lesson-content{padding:30px 28px 40px;font-size:13px}.lesson-content h1{letter-spacing:-.035em;margin-bottom:13px;font-size:25px;line-height:1.45}.lesson-objective{color:var(--fls-text-muted);font-size:13px}.lesson-meta{color:var(--fls-text-muted);border-bottom:1px solid var(--fls-border);gap:15px;margin-bottom:24px;padding:16px 0 23px;font-size:10px;display:flex}.lesson-content h2{margin:25px 0 12px;font-size:17px;font-weight:600;line-height:1.5}.lesson-content p{margin-bottom:14px;line-height:1.95}.lesson-content code{background:var(--fls-code);border-radius:4px;padding:2px 4px;font-family:ui-monospace,Menlo,Consolas,Microsoft YaHei,monospace;font-size:12px}.code-example{border:1px solid var(--fls-border);background:var(--fls-code);border-radius:9px;margin:20px 0;position:relative;overflow:auto}.code-example pre{margin:0;padding:17px;font-size:11px;line-height:1.8}.code-example code{padding:0}.lesson-content ul{padding-left:22px;list-style:outside}.key-points{background:var(--fls-soft);border-radius:9px;margin-bottom:22px;padding:3px 18px 18px}.key-points h2{font-size:14px}.editing-pane{flex-direction:column;flex:1;min-height:0;display:none}.editing-pane.is-active{display:flex}.task-strip{color:var(--fls-text-muted);border-bottom:1px solid var(--fls-border);background:var(--fls-bg);gap:9px;padding:13px 16px;font-size:11px;display:flex}.task-strip>svg{color:var(--fls-accent);margin-top:2px}.file-tabs{border-bottom:1px solid var(--fls-border);flex-shrink:0;display:flex;overflow:auto}.file-tabs button{white-space:nowrap;border-bottom:2px solid #0000;border-radius:0;padding:8px 16px;font:11px/2 ui-monospace,monospace}.file-tabs button.active{border-bottom-color:var(--fls-accent);color:var(--fls-accent);background:var(--fls-bg)}.cm-theme,.cm-theme-light,.cm-theme-dark{flex:1;min-height:0;overflow:hidden}.cm-editor{height:100%;color:var(--fls-text);font:12px/1.85 ui-monospace,Menlo,Consolas,Microsoft YaHei,monospace;background:var(--fls-surface)!important}.cm-scroller{overflow:auto}.editor-status{border-top:1px solid var(--fls-border);color:var(--fls-text-muted);justify-content:space-between;gap:10px;padding:8px 13px;font-size:9px;display:flex}.editor-keyboard{border-bottom:1px solid var(--fls-border);color:var(--fls-text-muted);flex-wrap:wrap;align-items:center;gap:5px 10px;padding:6px 12px;font-size:11px;display:flex}.editor-keyboard button,.error-location{color:var(--fls-accent);border:1px solid;border-radius:6px;flex-shrink:0;padding:5px 8px}.editor-location-status{color:var(--fls-text)}.error-card>svg{flex-shrink:0}.error-card>div{min-width:0}.error-location{overflow-wrap:anywhere;max-width:100%}.lesson-actions{border-top:1px solid var(--fls-border);flex-wrap:wrap;flex-shrink:0;align-items:center;gap:8px;padding:12px;font-size:11px;display:flex}.lesson-actions button{align-items:center;gap:6px;display:flex}.auto-toggle{color:var(--fls-text-muted);align-items:center;gap:5px;font-size:10px;display:flex}.lesson-actions .primary{margin-left:auto}.lesson-actions kbd{color:inherit;opacity:.7;border-color:currentColor}.quiz-link{align-items:center;font-size:10px;display:flex}.preview-tools{border-bottom:1px solid var(--fls-border);color:var(--fls-text-muted);justify-content:space-between;align-items:center;padding:9px 12px;font-size:10px;display:flex}.preview-tools select{margin-left:5px;padding:3px 6px;font-size:10px}.preview-tools>div{display:flex}.preview-stage{background:var(--fls-surface);flex:1;min-height:200px;position:relative;overflow:auto}.preview-stage iframe{background:var(--fls-surface);border:0;height:100%;min-height:350px;display:block}.candidate-frame{opacity:0;pointer-events:none;position:absolute;top:0;right:0;bottom:0;left:0}.live-frame{position:relative}.preview-empty{min-height:260px;color:var(--fls-text-muted);place-items:center;font-size:12px;display:grid}.preview-foot{border-top:1px solid var(--fls-border);color:var(--fls-text-muted);align-items:center;gap:6px;padding:10px 13px;font-size:9px;display:flex}.status-dot{background:var(--fls-accent);border-radius:50%;width:5px;height:5px}.error-card{max-height:240px;color:var(--fls-danger);background:var(--fls-danger-bg);border-top:1px solid var(--fls-border);gap:10px;padding:15px;font-size:12px;display:flex;overflow:auto}.error-card pre{white-space:pre-wrap;overflow-wrap:anywhere;margin:8px 0;font-size:11px}.console-panel{flex:1;padding:12px;font-size:11px;overflow:auto}.console-filter{justify-content:space-between;margin-bottom:15px;display:flex}.console-filter select{font-size:11px}.log{border-bottom:1px solid var(--fls-border);overflow-wrap:anywhere;padding:8px 0}.log summary{cursor:pointer}.log time{color:var(--fls-text-muted);font-size:9px}.log-error{color:var(--fls-danger)}.log pre{white-space:pre-wrap}.mobile-panel-tabs{display:none}.loading-shell,.empty-state{justify-items:center;gap:20px;padding:80px 30px;display:grid}.loading{color:var(--fls-text-muted);padding:30px}.page-recovery{text-align:center;overflow-wrap:anywhere;max-width:760px;margin:0 auto}.recovery-actions{flex-wrap:wrap;justify-content:center;gap:12px;display:flex}.recovery-actions button{border:1px solid var(--fls-control-border)}:root[data-theme=dark] .cm-editor .cm-gutters{color:var(--fls-text-muted)}.quiz-page{max-width:1080px;margin:0 auto;padding:35px 36px 60px}.quiz-page>h1{margin:10px 0 14px;font-size:27px}.back-link{color:var(--fls-text-muted);align-items:center;gap:6px;margin-bottom:25px;font-size:12px;display:flex}.question-nav{gap:8px;margin:25px 0;display:flex}.question-nav button{border:1px solid var(--fls-border);background:var(--fls-surface);min-width:36px}.question-nav button[aria-current]{background:var(--fls-accent);color:var(--fls-on-accent)}.question-card,.result-item{background:var(--fls-surface);border:1px solid var(--fls-border);border-radius:12px;margin-bottom:20px;padding:24px}.question-meta{color:var(--fls-text-muted);margin-bottom:12px;font-size:11px}.question-card h2{margin-bottom:24px;font-size:18px}.question-card fieldset{border:0;padding:0}.option{border:1px solid var(--fls-border);cursor:pointer;border-radius:8px;align-items:center;gap:12px;margin:10px 0;padding:14px 17px;display:flex}.option:has(input:checked){background:var(--fls-soft);border-color:var(--fls-accent)}.quiz-actions{justify-content:space-between;gap:15px;display:flex}.quiz-code{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:15px;min-height:480px;display:grid}.quiz-code-editor{border:1px solid var(--fls-border);border-radius:8px;flex-direction:column;min-width:0;min-height:400px;display:flex;overflow:hidden}.quiz-code .runtime-label{display:none}.quiz-result-hero{text-align:center;background:var(--fls-soft);border-radius:16px;margin-bottom:25px;padding:28px}.quiz-result-hero>svg{color:var(--fls-accent);margin:0 auto 15px}.quiz-result-hero h1{color:var(--fls-accent);font-size:64px;line-height:1.3}.quiz-result-hero h1 small{font-size:16px}.quiz-result-hero h2{margin-bottom:10px;font-size:20px}.result-item h3{margin-bottom:14px;font-size:15px}.result-item h3 span{color:var(--fls-accent);font-size:11px}.result-item p{margin-bottom:10px;font-size:13px}.result-item a{color:var(--fls-accent);font-size:12px}@media(max-width:1279px){.studio-shell{grid-template-columns:minmax(0,1fr)}.course-sidebar{z-index:50;width:260px;box-shadow:var(--fls-shadow);display:none;position:fixed;inset:0 auto 0 0}.course-sidebar.drawer-open{display:flex}.studio-shell>.sidebar-resize{display:none}.menu-button{display:block}.studio-header{gap:12px;padding:0 20px}.breadcrumb{margin-right:auto}.drawer-backdrop{z-index:40;background:#0004;border:0;border-radius:0;display:block;position:fixed;top:0;right:0;bottom:0;left:0}.learn-page{padding:18px}.lesson-content{padding:25px 23px}.runtime-label{display:none}}@media(max-width:767px){.studio-header{height:61px;padding:0 12px}.breadcrumb{gap:8px;font-size:11px}.breadcrumb>span{display:none}.header-tools{gap:6px}.progress-chip progress{display:none}.save-indicator{max-width:5em;font-size:10px;line-height:1.3;display:inline-block}.learn-page{height:100%;padding:12px 12px 66px;display:block;position:relative}.learning-splitter{display:none}.learning-panel,.preview-panel{height:100%}.learn-page>.preview-panel,.learn-page.mobile-preview>.learning-panel{display:none}.learn-page.mobile-preview>.preview-panel{display:flex}.mobile-panel-tabs{height:58px;padding-bottom:env(safe-area-inset-bottom);background:var(--fls-rail);border-top:1px solid var(--fls-border);z-index:30;grid-template-columns:repeat(3,1fr);display:grid;position:fixed;bottom:0;left:0;right:0}.mobile-panel-tabs button{border-radius:0;justify-content:center;align-items:center;gap:8px;font-size:12px;display:flex}.mobile-panel-tabs button[aria-current]{background:var(--fls-soft);color:var(--fls-accent)}.chapter-label{display:none}.lesson-content{padding:24px 20px}.lesson-content h1{font-size:23px}.lesson-actions{gap:4px;padding:8px}.lesson-actions button{font-size:10px}.lesson-actions kbd{display:none}.auto-toggle,.quiz-link{font-size:9px}.quiz-page{padding:25px 15px 45px}.quiz-page>h1{font-size:23px}.question-card,.result-item{padding:18px 14px}.quiz-code{grid-template-columns:minmax(0,1fr)}.quiz-code .preview-panel{min-height:400px}.question-nav{flex-wrap:wrap}.question-card h2{font-size:16px}.preview-tools{padding:8px}.preview-stage iframe{min-height:350px}.lesson-content pre{font-size:10px}.sidebar-bottom>p{font-size:20px}}@media(prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-outline-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}.callout{padding:15px 18px;margin:22px 0;border-left:3px solid var(--fls-accent);border-radius:0 8px 8px 0;background:var(--fls-soft)}.callout-warn{border-left-color:var(--fls-danger);background:var(--fls-danger-bg)}.callout p:last-child{margin-bottom:0}.code-example-bar{display:flex;align-items:center;justify-content:space-between;padding:5px 11px;border-bottom:1px solid var(--fls-border);font-size:10px;color:var(--fls-text-muted)}.code-example-bar button{display:flex;align-items:center;gap:5px;font-size:10px}.hljs-keyword,.hljs-selector-tag,.hljs-title{color:var(--fls-accent);font-weight:600}.hljs-string,.hljs-attr,.hljs-number{color:var(--fls-text)}.hljs-comment{color:var(--fls-text-muted);font-style:italic}.solution-dialog{background:var(--fls-surface);color:var(--fls-text);border:1px solid var(--fls-border);border-radius:16px;padding:25px;width:min(1000px,94vw);max-height:90dvh;overflow:auto;margin:auto;box-shadow:var(--fls-shadow)}.solution-dialog::backdrop{background:#0006}.solution-dialog header{display:flex;justify-content:space-between;align-items:flex-start;gap:15px;margin-bottom:15px}.solution-dialog h2{font-size:20px}.solution-dialog>p{font-size:12px;margin-bottom:20px}.solution-columns{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:14px;padding:14px 0}.solution-columns section{min-width:0}.solution-columns h3{font-size:12px;margin:8px 0}.solution-columns pre{font:11px/1.9 ui-monospace,monospace;overflow:auto;background:var(--fls-code);padding:10px}.solution-columns pre>span{display:inline-block;min-width:100%}.solution-columns small{display:inline-block;width:24px;color:var(--fls-text-muted);-webkit-user-select:none;user-select:none}.diff-added{background:var(--fls-soft)}.diff-removed{background:var(--fls-danger-bg)}.solution-dialog footer{display:flex;justify-content:flex-end;gap:12px;margin-top:15px}@media(max-width:767px){.solution-columns{grid-template-columns:minmax(0,1fr)}.solution-dialog{padding:16px}}.profile-metrics{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px;margin:30px 0}.profile-metrics section{background:var(--fls-soft);border:1px solid var(--fls-border);border-radius:12px;padding:22px;color:var(--fls-accent)}.profile-metrics strong{display:block;font-size:32px;margin:14px 0 4px}.profile-metrics strong small{font-size:12px;font-weight:400}.profile-metrics span{font-size:11px;color:var(--fls-text-muted)}.profile-page h2{font-size:17px;margin-bottom:16px}.module-record{display:flex;justify-content:space-between;align-items:center;gap:15px;border-bottom:1px solid var(--fls-border);padding:12px 0;margin-bottom:15px}.module-record h3{margin:0 0 5px}.module-record p{font-size:11px;margin:0}.theme-setting{display:flex;align-items:center;gap:16px;font-size:12px;margin:20px 0}.data-actions{display:flex;gap:12px;flex-wrap:wrap;margin:20px 0}.data-actions button{display:flex;align-items:center;gap:7px;border:1px solid var(--fls-border);font-size:12px}.reset-details{margin-top:25px;border-top:1px solid var(--fls-border);padding-top:20px;color:var(--fls-danger);font-size:12px}.reset-details summary{cursor:pointer}.reset-details p{margin-top:15px}.reset-details button{border:1px solid var(--fls-danger)}@media(max-width:600px){.profile-metrics{gap:8px}.profile-metrics section{padding:14px 10px}.profile-metrics strong{font-size:24px}.profile-metrics span{font-size:9px}.module-record{align-items:flex-start}.profile-page .result-item{padding:20px 15px}}.question-inputs{min-width:0;border:0;padding:0;margin:0}.question-topline,.quiz-topline{display:flex;align-items:center;justify-content:space-between;gap:16px}.question-topline{margin-bottom:10px}.question-topline button{display:flex;align-items:center;gap:6px;font-size:11px}.question-topline button[aria-pressed=true]{background:var(--fls-soft);color:var(--fls-accent)}.question-topline .question-meta{margin:0}.question-nav button:disabled{opacity:.7}.quiz-timer{font:16px/1.5 ui-monospace,monospace;padding:7px 12px;border:1px solid var(--fls-border);border-radius:8px;background:var(--fls-surface)}.fill-stem{font-size:17px;line-height:2.5;overflow-wrap:anywhere}.fill-stem input{display:inline-block;max-width:calc(100% - 12px);min-width:90px;font:14px/1.5 ui-monospace,monospace;margin:0 6px}.question-inputs textarea{display:block;min-height:120px;width:100%;margin:12px 0;font-family:ui-monospace,monospace}.question-inputs>pre{background:var(--fls-code);padding:18px;overflow:auto;margin-bottom:18px;border-radius:8px}.quiz-result-actions{display:flex;align-items:center;gap:18px;flex-wrap:wrap}.storage-notice{background:var(--fls-danger-bg);color:var(--fls-danger);font-size:12px;padding:12px 20px;flex-shrink:0;border-bottom:1px solid var(--fls-border)}@media(max-width:767px){.question-topline{align-items:flex-start;gap:6px}.question-topline button{white-space:nowrap;padding:4px}.quiz-topline{gap:8px}.quiz-timer{font-size:12px;padding:6px}.fill-stem{font-size:15px}.storage-notice{font-size:11px;padding:8px 12px}}.answer-diff{margin-top:15px;border:1px solid var(--fls-border);border-radius:8px;overflow:hidden}.diff-headings{display:grid;grid-template-columns:1fr 1fr;border-bottom:1px solid var(--fls-border);background:var(--fls-code)}.diff-headings h3{font-size:12px;padding:10px 14px}.answer-diff .cm-mergeView{max-height:50dvh;overflow:auto}.answer-diff .cm-mergeEditor{min-width:0;overflow:auto}.answer-diff .cm-editor{height:auto!important;min-height:200px}.answer-diff .cm-merge-a .cm-changedLine,.answer-diff .cm-deletedText{background:var(--fls-danger-bg)}.answer-diff .cm-merge-b .cm-changedLine,.answer-diff .cm-insertedText{background:var(--fls-soft)}.answer-diff .cm-gutters{background:var(--fls-code);color:var(--fls-text-muted)}.answer-diff .cm-mergeGap{background:var(--fls-border)}