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var(--tw-backdrop-sepia,)}.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{--po-blue:#035eec;--po-sky:#0996fc;--po-deep:#0132a5;--po-mid:#0342b9;--po-ink:#03070d;--po-gray:#55565a;--ink:#03070d;--heading:#111827;--text:#374151;--muted:#55565a;--subtle:#6b7280;--paper:#f5f8fd;--panel:#fff;--line:#e2e8f0;--brand:#035eec;--sky:#0996fc;--slab:#0a1122;--soft:#eaf1fe;--accent-text:#035eec;--brand-fill:#035eec;--brand-hover:#0342b9;--on-brand-fill:#fff;--accent-soft:#e3edff;--brand-gradient:linear-gradient(135deg, #0996fc 0%, #035eec 52%, #0132a5 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0 8px;font-size:14px;font-weight:900}.rail{background:var(--panel);border-right:1px solid var(--line);flex-direction:column;min-width:0;padding:24px 18px;display:flex;overflow-y:auto}.course-progress{background:var(--slab);color:#fff;border-radius:16px;grid-template-columns:1fr auto;gap:10px;padding:18px;display:grid}.course-progress span{letter-spacing:.12em;color:#c3cde0;font-size:14px;font-weight:800}.course-progress strong{font-size:16px}.progress-track{background:#26324f;border-radius:10px;grid-column:1/-1;height:5px;overflow:hidden}.progress-track i{background:var(--sky);height:100%;display:block}.rail-label{letter-spacing:.14em;color:var(--muted);margin:26px 10px 10px;font-size:14px;font-weight:800}.ladder-banner{flex-direction:column;gap:6px;margin:26px 10px 10px;display:flex}.ladder-banner .rail-label{color:var(--accent-text);margin:0}.ladder-clear{min-height:44px;color:var(--muted);background:0 0;border:0;align-self:flex-start;align-items:center;padding:0;font-size:13px;font-weight:700;text-decoration:underline;display:flex}.ladder-clear:hover{color:var(--ink)}.exercise-list{flex-direction:column;gap:5px;display:flex}.exercise-list button{text-align:left;color:var(--ink);background:0 0;border:0;border-radius:12px;align-items:center;gap:12px;padding:11px 10px;display:flex}.exercise-list button.selected{background:var(--accent-soft)}.exercise-list button:disabled{opacity:.62}.exercise-list button b{margin-bottom:4px;font-size:16px;display:block}.exercise-list button small{color:var(--muted);white-space:nowrap;text-overflow:ellipsis;max-width:150px;font-size:14px;display:block;overflow:hidden}.step-state{border:1px solid var(--muted);flex:0 0 30px;place-items:center;height:30px;display:grid}@supports (color:color-mix(in lab, red, red)){.step-state{border:1px solid color-mix(in srgb, var(--muted) 45%, 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#fff6;border-radius:9px;flex:1;min-height:36px;padding:8px;font-size:13px;font-weight:700}.drill-exercise-item{border-radius:12px;align-items:center;gap:12px;padding:11px 10px;display:flex}.drill-exercise-item.current{background:var(--accent-soft)}.app-shell[data-theme=dark] .drill-exercise-item.current{background:#10203f}.drill-exercise-item.passed .step-state{background:var(--brand-fill);border-color:var(--brand-fill);color:var(--on-brand-fill)}.drill-exercise-item.failed .step-state{color:#c0392b;background:#f6dedb;border-color:#c0392b}.drill-exercise-item b{font-size:15px;display:block}.rail-upgrade-card{background:var(--soft);border:1px solid var(--brand);border-radius:14px;margin-top:14px;padding:14px}.rail-upgrade-card span{letter-spacing:.1em;color:var(--accent-text);text-transform:uppercase;margin-bottom:6px;font-size:12px;font-weight:900;display:block}.rail-upgrade-card p{color:var(--ink);margin:0 0 10px;font-size:13px;line-height:1.5}.rail-upgrade-card 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var(--line);margin-top:24px;padding-top:18px}.message-history-list{flex-direction:column;gap:8px;margin:12px 0 0;padding:0;list-style:none;display:flex}.message-history-row{border:1px solid var(--line);background:var(--paper);border-radius:10px;flex-direction:column;gap:3px;padding:10px 12px;display:flex}.message-history-row small{color:var(--muted);font-size:11px}.nav-tour-backdrop{z-index:40;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);background:#050a1499;height:100dvh;position:fixed;inset:0}.nav-tour-highlight{z-index:41;border:2px solid var(--brand);pointer-events:none;background:#035eec22;border-radius:12px;position:fixed;box-shadow:0 0 0 6px #035eec33}.nav-tour-callout{z-index:42;background:var(--panel);width:min(280px,90vw);max-height:calc(100vh - 24px);color:var(--ink);border-radius:14px;padding:16px;position:fixed;overflow-y:auto;box-shadow:0 20px 50px #0006}.nav-tour-callout h3{margin:6px 0;font-size:18px}.nav-tour-callout p{color:var(--muted);margin:0 0 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solid var(--line);background:var(--paper);cursor:pointer;border-radius:10px;flex-direction:column;gap:5px;padding:10px 12px;display:flex}.notes-list-item:hover{background:var(--soft)}.notes-list-item.active{border-color:var(--brand);background:var(--soft)}.notes-list-item-top{justify-content:space-between;align-items:flex-start;gap:8px;display:flex}.notes-list-item-title{text-align:left;color:var(--ink);cursor:pointer;background:0 0;border:0;flex:1;padding:0;font-size:14px;font-weight:800}.notes-list-item small{color:var(--muted);font-size:11px}.notes-list-item .favorite-star{flex:none;width:32px;height:32px;font-size:14px}.notes-tree-children{flex-direction:column;gap:8px;margin-top:8px;display:flex}.notes-tree-toggle,.notes-tree-toggle-spacer{width:28px;height:28px;color:var(--muted);cursor:pointer;background:0 0;border:0;flex:none;justify-content:center;align-items:center;padding:0;font-size:11px;display:inline-flex}.notes-tag-row{flex-wrap:wrap;gap:6px;display:flex}.tag-chip{background:var(--soft);color:#55565a;border-radius:20px;padding:3px 9px;font-size:11px;font-weight:700}.app-shell[data-theme=dark] .tag-chip{color:var(--muted)}.tag-chip.removable{align-items:center;gap:5px;display:inline-flex}.tag-chip.removable button{color:inherit;cursor:pointer;background:0 0;border:0;padding:0;font-size:13px;line-height:1}.notes-editor{flex-direction:column;min-height:0;display:flex;overflow:hidden auto}.notes-empty-state{color:var(--muted);flex:1;place-items:center;display:grid}.notes-editor-head{justify-content:space-between;align-items:center;gap:12px;display:flex}.notes-title-input{color:var(--ink);background:0 0;border:0;border-bottom:2px solid #0000;outline:none;flex:1;padding:4px 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12px}.notes-attachments-strip{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.attachment-thumb{flex:none;width:56px;height:56px;position:relative}.attachment-thumb-image{border:1px solid var(--line);cursor:pointer;background:var(--paper);border-radius:10px;width:100%;height:100%;padding:0;overflow:hidden}.attachment-thumb-image img{object-fit:cover;width:100%;height:100%;display:block}.attachment-thumb-remove{border:1px solid var(--line);background:var(--panel);width:20px;height:20px;color:var(--ink);border-radius:50%;padding:0;font-size:12px;line-height:1;position:absolute;top:-7px;right:-7px}.attachment-add{border:1px dashed var(--line);background:var(--paper);width:56px;height:56px;color:var(--muted);border-radius:10px;flex:none;font-size:11px;font-weight:700}.attachment-error{color:#c0392b;margin-top:6px;display:block}.app-shell[data-theme=dark] .attachment-error{color:#ff8a75}.app-shell[data-theme=dark] .notebook-package-chip.failed{color:#ff8a75;border-color:#ff8a75}.app-shell[data-theme=dark] .notes-import-error{color:#ff8a75}.notes-diagram{width:100%;height:auto;max-height:420px;display:block}.bn-diagram-block{border:1px solid var(--line);background:var(--paper);border-radius:13px;margin:4px 0;overflow:hidden}.bn-diagram-block-preview{cursor:pointer}.bn-diagram-block-preview .notes-diagram{background:var(--soft)}.bn-diagram-block-preview:hover{border-color:var(--brand)}.diagram-node-box{fill:var(--soft);stroke:var(--line);stroke-width:1.5px}.diagram-node-label{fill:var(--ink);pointer-events:none;font-size:13px;font-weight:700}.diagram-edge line:not(.diagram-edge-hit){stroke:var(--muted);stroke-width:2px;fill:none}.diagram-edge-hit{stroke:#0000;stroke-width:14px}.diagram-edge-label{fill:var(--muted);paint-order:stroke;stroke:var(--paper);stroke-width:4px;stroke-linejoin:round;font-size:11px;font-weight:700}.diagram-arrow-head{fill:var(--muted)}.notes-diagram-editor{outline:none;flex-direction:column;display:flex}.notes-diagram-editor:focus-visible{box-shadow:inset 0 0 0 2px var(--brand)}.diagram-toolbar{border-bottom:1px solid var(--line);flex-wrap:wrap;align-items:center;gap:8px;padding:8px 10px;display:flex}.diagram-toolbar button{border:1px solid var(--line);background:var(--panel);min-height:40px;color:var(--ink);border-radius:8px;padding:8px 14px;font-size:12px;font-weight:700}.diagram-toolbar button:disabled{opacity:.5;cursor:not-allowed}.diagram-toolbar-hint{color:var(--muted);flex-basis:100%;font-size:11px}.diagram-toolbar-done{border-color:var(--brand)}.notes-diagram-editable{touch-action:none;background:var(--paper);min-height:260px}.diagram-node{cursor:grab}.diagram-node:focus-visible,.diagram-edge:focus-visible{outline:2px solid var(--brand);outline-offset:2px}.diagram-node.selected .diagram-node-box{stroke:var(--brand);stroke-width:2.5px}.diagram-node-handle{fill:var(--panel);stroke:var(--brand);stroke-width:1.5px;opacity:.35;pointer-events:none}.diagram-node-handle-hit{fill:#0000;cursor:crosshair}.diagram-node:hover .diagram-node-handle,.diagram-node.selected .diagram-node-handle{opacity:1}.diagram-edge{cursor:pointer}.diagram-edge.selected line:not(.diagram-edge-hit){stroke:var(--brand);stroke-width:2.5px}.diagram-edge-draft{stroke:var(--brand);stroke-width:2px;stroke-dasharray:5 4}.diagram-label-editor-input{box-sizing:border-box;border:1px solid var(--brand);background:var(--panel);width:100%;height:100%;color:var(--ink);border-radius:6px;outline:none;padding:3px 6px;font-size:12px}.modal-backdrop{place-items:center;padding:20px;display:grid}.coach-modal{background:var(--panel);width:min(600px,96vw);color:var(--ink);border:1px solid var(--line);border-radius:20px;padding:28px;box-shadow:0 30px 80px #0007}.coach-message{background:var(--soft);border-radius:13px;grid-template-columns:38px 1fr;gap:13px;margin:24px 0 18px;padding:17px;display:grid}.coach-message span{width:38px;height:38px;color:var(--on-brand-fill);background:var(--brand-fill);border-radius:10px;place-items:center;font-weight:900;display:grid}.coach-message p{color:var(--muted);margin:0;font-size:16px;line-height:1.65}.coach-plan{gap:8px;margin-bottom:20px;display:grid}.coach-plan div{border:1px solid var(--line);border-radius:10px;padding:11px 13px}.coach-plan b,.coach-plan small{display:block}.coach-plan b{margin-bottom:3px;font-size:15px}.coach-plan small{color:var(--muted);font-size:13px}.prototype-note{color:var(--muted);margin-top:13px;font-size:12px;line-height:1.5;display:block}.project-heading{align-items:end}.project-score{text-align:center;border:1px solid var(--line);background:var(--panel);min-height:150px;box-shadow:inset 0 5px 0 var(--brand);border-radius:18px;flex:0 0 175px;place-content:center;display:grid}.project-score strong{font-size:38px}.project-score span,.project-score small{display:block}.project-score span{font-size:14px;font-weight:900}.project-score small{color:var(--muted);margin-top:5px;font-size:12px}.project-principles{border:1px solid var(--line);background:var(--panel);border-radius:15px;grid-template-columns:repeat(3,1fr);margin:0 0 28px;display:grid}.project-principles div{border-right:1px solid var(--line);padding:17px 19px}.project-principles div:last-child{border:0}.project-principles b,.project-principles span{display:block}.project-principles b{color:var(--accent-text);margin-bottom:6px;font-size:13px}.project-principles span{color:var(--muted);font-size:13px;line-height:1.5}.project-grid{grid-template-columns:1fr 1fr;gap:14px;display:grid}.project-card{background:var(--panel);border:1px solid var(--line);border-radius:17px;flex-direction:column;min-height:325px;padding:23px;display:flex;position:relative;overflow:hidden}.project-card:before{content:"";background:var(--brand);width:4px;position:absolute;top:0;bottom:0;left:0}.project-card.blue:before{background:#3890c7}.project-card.green:before{background:#3b9c68}.project-card.yellow:before{background:#d69a00}.project-card-top{justify-content:space-between;align-items:center;display:flex}.project-card-top span{color:var(--accent-text);letter-spacing:.12em;font-size:12px;font-weight:900}.project-card-top b{background:var(--soft);color:var(--muted);border-radius:7px;padding:5px 7px;font-size:12px}.project-card h2{max-width:420px;margin:21px 0 10px;font-size:21px}.capstone-track-badge{color:var(--muted);margin:-4px 0 6px;font-size:12px;font-weight:800;display:block}.project-card>p{color:var(--muted);font-size:15px;line-height:1.6}.tool-chips{flex-wrap:wrap;gap:5px;margin:10px 0 18px;display:flex}.tool-chips span{border:1px solid var(--line);color:var(--muted);border-radius:7px;padding:6px 8px;font-size:12px;font-weight:800}.project-meta{color:var(--muted);gap:18px;margin-top:auto;font-size:12px;display:flex}.project-card>button{text-align:left;border:0;border-top:1px solid var(--line);color:var(--ink);background:0 0;margin-top:15px;padding:11px 0 0;font-size:14px;font-weight:900}.project-modal{background:var(--panel);width:min(760px,96vw);max-height:90dvh;color:var(--ink);border:1px solid var(--line);border-radius:20px;padding:29px;overflow:auto;box-shadow:0 30px 80px #0007}.project-brief{color:var(--muted);margin:24px 0;font-size:16px;line-height:1.7}.project-modal-grid{grid-template-columns:1.15fr .85fr;gap:14px;display:grid}.modal-label{color:var(--accent-text);letter-spacing:.13em;margin-bottom:10px;font-size:12px;font-weight:900;display:block}.project-modal ol{gap:7px;margin:0;padding:0;list-style:none;display:grid}.project-modal li{background:var(--paper);border:1px solid var(--line);border-radius:9px;align-items:center;gap:9px;padding:10px;font-size:14px;display:flex}.project-modal li span{background:var(--soft);width:20px;height:20px;color:var(--accent-text);border-radius:50%;place-items:center;font-size:12px;display:grid}.deliverable-card{color:#f4f7fc;background:#0a1122;border-radius:13px;padding:18px}.deliverable-card p{color:#c3cde0;min-height:90px;font-size:15px;line-height:1.6}.deliverable-card b,.deliverable-card small{display:block}.deliverable-card b{color:var(--sky);font-size:15px}.deliverable-card small{color:#97a3bb;margin-top:3px;font-size:12px}.project-modal-actions{justify-content:flex-end;gap:9px;margin-top:20px;display:flex}.project-submission-form{border-top:1px solid var(--line);margin-top:22px;padding-top:18px}.submission-fields{grid-template-columns:1fr 1fr;gap:12px;margin-top:12px;display:grid}.submission-fields label{color:var(--muted);gap:5px;font-size:12px;font-weight:800;display:grid}.submission-fields label:last-child{grid-column:1/-1}.submission-fields input,.submission-fields select,.submission-fields textarea{border:1px solid var(--line);background:var(--paper);color:var(--ink);border-radius:8px;padding:9px 11px;font-size:13px;font-weight:400}.submission-fields textarea{resize:vertical;min-height:90px}.project-modal-actions button{border-radius:9px;padding:11px 14px;font-size:14px;font-weight:900}.mastery-section{margin-top:58px}.mastery-ladder{grid-template-columns:repeat(5,1fr);gap:8px;display:grid}.mastery-ladder article{background:var(--panel);border:1px solid var(--line);border-radius:14px;flex-direction:column;min-height:210px;padding:18px;display:flex}.mastery-ladder article>span{color:var(--accent-text);font:15px var(--mono)}.mastery-ladder h3{margin:24px 0 9px;font-size:17px}.mastery-ladder p{color:var(--muted);font-size:14px;line-height:1.55}.mastery-ladder b{border-top:1px solid var(--line);color:var(--accent-text);margin-top:auto;padding-top:10px;font-size:13px}.video-modal{width:min(980px,96vw);max-height:92dvh;color:var(--ink);background:var(--panel);border:1px solid var(--line);border-radius:20px;padding:27px;overflow:auto;box-shadow:0 30px 80px #0008}.video-layout{grid-template-columns:minmax(0,1fr) 255px;gap:14px;margin-top:22px;display:grid}.video-stage{aspect-ratio:16/9;background:#050810;border:1px solid #1e2a44;border-radius:15px;width:100%;display:block}.chapter-list{border:1px solid var(--line);background:var(--paper);border-radius:14px;padding:16px}.chapter-list>button{text-align:left;border:0;border-bottom:1px solid var(--line);width:100%;color:var(--ink);background:0 0;grid-template-columns:39px 1fr;gap:7px;padding:12px 10px;display:grid}.chapter-list>button.active{background:var(--soft);border-radius:8px}.chapter-list>button span{color:var(--accent-text);font:12px var(--mono)}.app-shell[data-theme=dark] .chapter-list>button span{color:var(--brand)}.chapter-list>button b{font-size:13px}.chapter-list .modal-label{color:var(--accent-text)}.app-shell[data-theme=dark] .chapter-list .modal-label{color:var(--brand)}.video-resources{margin-top:24px}.video-resources button{text-align:left;border:1px solid var(--line);background:var(--panel);width:100%;color:var(--ink);border-radius:8px;margin-bottom:7px;padding:9px;font-size:13px;font-weight:800}.video-empty{text-align:center;color:var(--muted);background:var(--paper);border:1px dashed var(--line);border-radius:15px;justify-items:center;gap:8px;margin-top:22px;padding:48px 24px;display:grid}.video-empty-icon{font-size:34px}.video-empty b{color:var(--ink);font-size:16px}.video-empty .video-resources{width:min(320px,100%);margin-top:16px}.learning-engine,.simulation-section{margin-top:64px}.engine-grid{grid-template-columns:1.15fr .9fr .85fr;gap:13px;display:grid}.engine-grid>article{border:1px solid var(--line);background:var(--panel);border-radius:17px;min-height:310px;padding:21px}.engine-card-head{justify-content:space-between;align-items:flex-start;display:flex}.engine-card-head h3,.review-card h3,.weekly-card h3{margin:8px 0 18px;font-size:18px}.engine-card-head>b{color:var(--accent-text);font-size:22px}.skill-bars{gap:13px;display:grid}.skill-bars>div{grid-template-columns:112px 1fr 32px;align-items:center;gap:9px;display:grid}.skill-bars span b,.skill-bars span small{display:block}.skill-bars span b{font-size:13px}.skill-bars span small{color:var(--muted);margin-top:2px;font-size:11px}.skill-bars i{background:var(--soft);border-radius:8px;height:6px;overflow:hidden}.skill-bars em{background:var(--brand);border-radius:8px;height:100%;display:block}.skill-bars strong{text-align:right;font-size:12px}.mastery-toggle{border:0;border-top:1px solid var(--line);text-align:center;width:100%;color:var(--accent-text);background:0 0;margin-top:13px;padding:9px 0 0;font-size:13px;font-weight:900;display:block}.review-card{color:#f4f7fc;background:#0a1122!important;border-color:#1e2a44!important}.review-card .eyebrow{color:#4dabff}.review-card h3{margin-top:25px}.review-card p{color:#c3cde0;min-height:76px;font-size:14px;line-height:1.65}.mistake-example{flex-wrap:wrap;align-items:center;gap:7px;margin:18px 0;display:flex}.mistake-example code{color:#cfe3ff;background:#060b16;border-radius:7px;padding:7px 8px;font-size:12px}.review-card .primary{width:100%;margin-top:4px}.weekly-card>div{border-bottom:1px solid var(--line);grid-template-columns:38px 1fr auto;gap:8px;padding:10px 0;font-size:13px;display:grid}.weekly-card>div b{color:var(--accent-text)}.weekly-card>div 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button{color:var(--muted);background:var(--paper);border:1px solid var(--line);border-radius:8px;padding:7px 9px;font-size:12px;font-weight:900}.friend-filters button.active{color:var(--on-brand-fill);background:var(--brand-fill);border-color:var(--brand-fill)}.friend-list{display:grid}.friend-list article{border-bottom:1px solid var(--line);grid-template-columns:42px 1fr auto;align-items:center;gap:10px;padding:12px 0;display:grid}.friend-list article>span{color:#fff;background:var(--slab);border-radius:50%;place-items:center;width:42px;height:42px;font-size:11px;font-weight:900;display:grid;position:relative}.friend-list b{font-size:13px;display:block}.friend-list p{color:var(--muted);margin:3px 0;font-size:11px}.friend-list small{color:var(--accent-text);margin-top:3px;font-size:10px;font-weight:800;display:block}.friend-list button{min-height:44px;color:var(--accent-text);background:var(--paper);border:1px solid var(--line);border-radius:7px;padding:7px 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