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ul{flex-direction:column;gap:4px;max-height:180px;margin:0;padding:0;list-style:none;display:flex;overflow-y:auto}.follow-quiz li{color:var(--text-primary);align-items:center;gap:8px;font-size:13px;display:flex}.follow-quiz li>span:first-child{flex:1}@media (max-width:1100px){.follow-students{width:240px;min-width:240px}.follow-syllabus{width:250px;min-width:250px}}@media (max-width:768px){.follow-layout{flex-direction:column;overflow-y:auto}.follow-students,.follow-syllabus{width:100%;min-width:unset;border-right:none;border-bottom:1px solid var(--border);max-height:40vh}}a.link{color:var(--green-primary);text-decoration:none;transition:color .15s}a.link:hover{color:var(--green-light);text-decoration:underline}.prose{--tw-prose-body:var(--text-secondary);--tw-prose-headings:var(--text-primary);--tw-prose-links:var(--green-primary);--tw-prose-bold:var(--text-primary);--tw-prose-quotes:var(--text-primary);--tw-prose-code:var(--text-primary)}.quiz-review{text-align:left;max-width:560px;margin:24px auto 0}.quiz-review-title{color:var(--text-secondary);margin-bottom:8px;font-size:13px;font-weight:700}.quiz-review ol{border:1px solid var(--border);border-radius:var(--radius-md);margin:0;padding:0;list-style:none;overflow:hidden}.quiz-review li{color:var(--text-primary);align-items:flex-start;gap:10px;padding:10px 14px;font-size:14px;display:flex}.quiz-review li+li{border-top:1px solid var(--border)}.quiz-review-mark{flex-shrink:0;width:16px;font-weight:700}.quiz-review-prompt{flex:1;line-height:1.45}.quiz-review-state{flex-shrink:0;font-size:12px;font-weight:600}.quiz-review-correct .quiz-review-mark,.quiz-review-correct .quiz-review-state{color:var(--green-primary)}.quiz-review-wrong .quiz-review-mark,.quiz-review-wrong .quiz-review-state{color:var(--error)}.quiz-review-missing .quiz-review-mark,.quiz-review-missing .quiz-review-state{color:var(--text-muted)}.share-toggle{color:var(--text-secondary);cursor:pointer;-webkit-user-select:none;user-select:none;align-items:center;gap:8px;font-size:13px;display:inline-flex}.share-toggle input{width:16px;height:16px;accent-color:var(--green-primary);cursor:pointer}.course-search{max-width:420px;margin-bottom:20px;position:relative}.course-search>svg{color:var(--text-muted);pointer-events:none;position:absolute;top:50%;left:12px;transform:translateY(-50%)}.course-search .input{padding-left:36px}.rich-content table{margin:0;font-size:14px}.rich-content .table-responsive{border:1px solid var(--border);border-radius:var(--radius-md);margin:20px 0}.rich-content th,.rich-content td{vertical-align:top;padding:8px 12px!important}.rich-content th{background:var(--bg-surface);color:var(--text-primary)}.rich-content tr+tr td{border-top:1px solid var(--border)}.rich-content a.lesson-link{color:var(--green-primary);text-underline-offset:3px;font-weight:600;-webkit-text-decoration:underline dotted;text-decoration:underline dotted}.rich-content blockquote.callout{border-radius:var(--radius-sm);color:var(--text-secondary);border-left-width:4px;margin:20px 0;padding:4px 16px;font-style:normal}.rich-content blockquote.callout p:first-of-type:before,.rich-content blockquote.callout p:last-of-type:after{content:none}.rich-content blockquote.callout-note{border-left-color:var(--info);background:#2563eb0f}.rich-content blockquote.callout-tip{border-left-color:var(--green-primary);background:var(--green-glow)}.rich-content blockquote.callout-caution{border-left-color:var(--warning);background:#d9770614}.rich-content blockquote.callout-danger{border-left-color:var(--error);background:#dc262612}.rc-stepper{border:1px solid var(--border);border-radius:var(--radius-lg);background:var(--bg-card);outline:none;margin:24px 0;overflow:hidden}.rc-stepper:focus-visible{box-shadow:0 0 0 3px var(--green-glow-strong)}.rc-stepper-bar{border-bottom:1px solid var(--border);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;padding:10px 14px;display:flex}.rc-stepper-title{flex-direction:column;font-size:14px;line-height:1.3;display:flex}.rc-stepper-title strong{color:var(--text-primary)}.rc-stepper-title span{color:var(--text-muted);font-size:13px}.rc-stepper-actions{align-items:center;gap:6px;display:flex}.rc-stepper-actions button[disabled]{opacity:.4;cursor:default}.rc-stepper-stage{background:var(--bg-surface);padding:8px}.rc-stepper-slide{margin:0}.rc-stepper-slide img{border-radius:var(--radius-sm);background:#fff;width:auto;max-width:100%;height:auto;max-height:72vh;margin:0 auto;display:block}.rc-stepper-thumbs{border-top:1px solid var(--border);scrollbar-width:thin;gap:6px;padding:10px 12px;display:flex;overflow-x:auto}.rc-stepper-thumb{border:1px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;background:#fff;flex:none;width:56px;height:56px;padding:0;position:relative;overflow:hidden}.rc-stepper-thumb img{object-fit:cover;width:100%;height:100%;display:block}.rc-stepper-thumb span{color:var(--text-secondary);background:#ffffffe6;border-top-right-radius:4px;padding:2px 4px;font-size:10px;line-height:1;position:absolute;bottom:0;left:0}.rc-stepper-thumb[aria-selected=true]{border-color:var(--green-primary);box-shadow:0 0 0 2px var(--green-primary)}.rc-stepper-hint{color:var(--text-muted);padding:0 12px 8px;font-size:12px}.rc-stepper.is-all .rc-stepper-slide+.rc-stepper-slide{border-top:1px solid var(--border);margin-top:8px;padding-top:8px}.rc-stepper.is-all .rc-stepper-slide img{max-height:none}.rc-stepper.is-all .rc-stepper-thumbs,.rc-stepper.is-all .rc-stepper-hint,.rc-stepper.is-all [data-prev],.rc-stepper.is-all [data-next],.rc-stepper.is-all [data-pos]{display:none}.rich-editor .ProseMirror{overscroll-behavior:contain;outline:none;min-height:200px;max-height:60vh;padding:16px;overflow-y:auto}.rich-editor .ProseMirror img{max-width:100%;height:auto}.rich-editor .ProseMirror p.is-editor-empty:first-child:before{color:var(--text-muted);content:attr(data-placeholder);float:left;pointer-events:none;height:0}.app-header{z-index:50;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);background:#ffffffeb;flex-shrink:0;align-items:center;gap:16px;height:60px;padding:0 24px;display:flex;position:sticky;top:0}.app-brand{color:var(--text-primary);flex-shrink:0;align-items:center;gap:10px;font-size:17px;font-weight:700;text-decoration:none;display:inline-flex}.app-brand-mark{background:var(--green-primary);color:#fff;border-radius:9px;justify-content:center;align-items:center;width:30px;height:30px;display:inline-flex}.app-crumbs{min-width:0;color:var(--text-muted);flex:1;align-items:center;gap:6px;font-size:14px;display:flex;overflow:hidden}.app-crumbs a{color:var(--text-secondary);white-space:nowrap;text-decoration:none}.app-crumbs a:hover{color:var(--text-primary)}.app-crumbs .current{color:var(--text-primary);text-overflow:ellipsis;white-space:nowrap;font-weight:600;overflow:hidden}.app-header-actions{flex-shrink:0;align-items:center;gap:4px;min-width:0;margin-left:auto;display:flex}.app-user{border-left:1px solid var(--border);color:var(--text-secondary);align-items:center;gap:8px;margin-left:8px;padding:4px 4px 4px 12px;font-size:13px;display:inline-flex}.avatar{background:var(--green-glow-strong);width:32px;height:32px;color:var(--green-primary);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:13px;font-weight:700;display:inline-flex}.avatar-lg{width:40px;height:40px;font-size:15px}.app-tabs{background:var(--bg-card);border-bottom:1px solid var(--border);flex-shrink:0;gap:4px;padding:0 24px;display:flex;overflow-x:auto}.app-tab{color:var(--text-secondary);white-space:nowrap;border-bottom:2px solid #0000;align-items:center;gap:7px;padding:12px 12px 11px;font-size:14px;font-weight:500;text-decoration:none;display:inline-flex}.app-tab:hover{color:var(--text-primary)}.app-tab.active{color:var(--green-primary);border-bottom-color:var(--green-primary);font-weight:600}.page{max-width:1120px;margin:0 auto;padding:32px 24px 64px}.page-narrow{max-width:880px}.page-head{flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:16px;margin-bottom:24px;display:flex}.page-title{letter-spacing:-.02em;color:var(--text-primary);font-size:26px;font-weight:700;line-height:1.25}.page-subtitle{color:var(--text-secondary);margin-top:4px;font-size:14px}.section-head{justify-content:space-between;align-items:center;gap:12px;margin:32px 0 12px;display:flex}.section-head h2{color:var(--text-primary);font-size:17px;font-weight:700}.stack{flex-direction:column;gap:12px;display:flex}.row{align-items:center;gap:12px;display:flex}.muted{color:var(--text-muted)}.meta{color:var(--text-secondary);align-items:center;gap:6px;font-size:13px;display:flex}.list{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-card);overflow:hidden}.list-row{border-top:1px solid var(--border);align-items:center;gap:14px;padding:14px 20px;display:flex}.list-row:first-child{border-top:none}.list-row-main{flex:1;min-width:0}.list-row-title{color:var(--text-primary);font-size:14px;font-weight:600}.list-row-sub{color:var(--text-muted);margin-top:2px;font-size:13px}.list-row-actions{flex-shrink:0;align-items:center;gap:4px;display:flex}.code-box{font-family:var(--font-mono);letter-spacing:.14em;color:var(--green-primary);align-items:center;gap:10px;font-size:26px;font-weight:700;display:inline-flex}.code-box-sm{letter-spacing:.1em;font-size:15px}.join-card{grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:20px;padding:20px;display:grid}.join-steps{color:var(--text-secondary);margin:0;padding-left:20px;font-size:14px;line-height:1.9;list-style:decimal}.solderbrix-iframe{background:#1a202c;border:0;width:100%;height:min(78vh,780px);min-height:480px;display:block}.solderbrix-frame:fullscreen{border-radius:0;flex-direction:column;display:flex}.solderbrix-frame:fullscreen .solderbrix-iframe{flex:1;height:auto}.stats{grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:12px;display:grid}.stat{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:16px 18px;text-decoration:none}.stat-value{color:var(--text-primary);font-size:24px;font-weight:700;line-height:1.2}.stat-label{color:var(--text-muted);margin-top:2px;font-size:13px}.segmented{background:var(--bg-surface);border-radius:var(--radius-md);grid-auto-columns:1fr;grid-auto-flow:column;gap:4px;padding:4px;display:grid}.segmented button{font:600 14px var(--font-sans);color:var(--text-secondary);cursor:pointer;background:0 0;border:none;border-radius:8px;padding:9px 12px}.segmented button.active{background:var(--bg-card);color:var(--text-primary);box-shadow:var(--shadow-card)}.pin-input{font-family:var(--font-mono);letter-spacing:.6em;text-align:center;padding:12px 0 12px .6em;font-size:28px}@media (max-width:768px){.grid-cards{grid-template-columns:1fr}.sidebar-layout{flex-direction:column}.sidebar{width:100%;min-width:unset;border-right:none;border-bottom:1px solid var(--border);max-height:60vh}.sidebar:not(.open) .sidebar-list{display:none}.sidebar-toggle{margin-top:10px;display:inline-flex!important}.app-header{gap:10px;padding:0 16px}.app-tabs{padding:0 12px}.app-user-name,.app-brand-name,.app-crumbs>span:not(:last-child),.app-crumbs>span:last-child>svg{display:none}.app-user{margin-left:0;padding-left:8px}.join-card{grid-template-columns:1fr}.page{padding:24px 16px 48px}.list-row{flex-wrap:wrap;padding:14px 16px}}@media print{.nav,.app-header,.app-tabs,.btn,.btn-row{display:none!important}.card{box-shadow:none;border:1px solid #ccc}body{background:#fff}}a:focus-visible{outline:2px solid var(--green-primary);outline-offset:2px;border-radius:var(--radius-sm)}@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-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@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}