:root{--bg-app:#f9f7f1;--bg-surface:#fff;--bg-sidebar:#f3efe6;--bg-subtle:#eee9dc;--bg-hover:#e4ddcd;--ink-primary:#2d3748;--ink-secondary:#4a5568;--ink-muted:#718096;--ink-faint:#a0aec0;--pastel-purple-bg:#f5f3ff;--pastel-purple-border:#ddd6fe;--pastel-purple-ink:#7c3aed;--pastel-purple-pill:#ede9fe;--pastel-green-bg:#ecfdf5;--pastel-green-border:#a7f3d0;--pastel-green-ink:#059669;--pastel-yellow-bg:#fefce8;--pastel-yellow-border:#fef08a;--pastel-yellow-ink:#854d0e;--washi-tape-yellow:#fef08abf;--pastel-blue-bg:#eff6ff;--pastel-blue-border:#bfdbfe;--pastel-blue-ink:#2563eb;--pastel-coral-bg:#fff1f2;--pastel-coral-border:#fecdd3;--pastel-coral-ink:#e11d48;--border-pen:1.5px solid #374151;--border-pen-thick:2px solid #2d3748;--border-pen-subtle:1px solid #cbd5e1;--border-dashed:1.5px dashed #94a3b8;--radius-card:14px;--radius-sm:8px;--radius-pill:9999px;--font-display:"Shantell Sans", cursive, sans-serif;--font-body:"Shantell Sans", cursive, sans-serif;--font-hand:"Patrick Hand", cursive, sans-serif;--font-mono:"JetBrains Mono", monospace;--shadow-card:2px 3px 0px #2d37481f;--shadow-card-hover:3px 5px 0px #2d374829;--shadow-btn:1.5px 2px 0px #2d374840;--shadow-btn-hover:2px 3px 0px #2d374859;--shadow-sticky:2px 4px 10px #2d374814;--border-default:var(--border-pen);--border-strong:var(--border-pen-thick)}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html,body{background-color:var(--bg-app);height:100%;color:var(--ink-primary);font-family:var(--font-body);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:15px;line-height:1.65;overflow:hidden}button,input,textarea,select{font:inherit;color:inherit}::selection{background:var(--pastel-yellow-border);color:var(--ink-primary)}::-webkit-scrollbar{width:7px;height:7px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{border-radius:var(--radius-pill);background:#d4cebe}::-webkit-scrollbar-thumb:hover{background:#b8af9c}.app-workspace-shell{background:var(--bg-app);width:100vw;height:100vh;display:flex;position:relative;overflow:hidden}.center-topbar{z-index:20;background:#fffdf9;border-bottom:1.5px solid #e2d9c8;flex-shrink:0;justify-content:space-between;align-items:center;height:52px;padding:0 24px;display:flex}.breadcrumb-trail{color:var(--ink-muted);align-items:center;gap:10px;font-size:14px;font-weight:600;display:flex}.breadcrumb-trail a{color:var(--ink-primary);border-radius:var(--radius-sm);align-items:center;gap:4px;padding:2px 6px;text-decoration:none;transition:background .1s;display:inline-flex}.breadcrumb-trail a:hover{background:var(--bg-subtle)}.breadcrumb-current{color:var(--ink-primary);font-size:15px;font-weight:700}.header-meta-group{align-items:center;gap:16px;display:flex}.progress-widget{color:var(--ink-muted);align-items:center;gap:8px;font-size:13px;font-weight:600;display:flex}.progress-track{border-radius:var(--radius-pill);background:#e2e8f0;border:1px solid #cbd5e1;width:90px;height:8px;overflow:hidden}.progress-fill{border-radius:var(--radius-pill);background:linear-gradient(90deg,#10b981,#059669);height:100%;transition:width .3s}.streak-badge{color:var(--ink-primary);border:var(--border-pen);border-radius:var(--radius-pill);background:#fff;align-items:center;gap:5px;padding:2px 10px;font-size:13px;font-weight:700;display:inline-flex;box-shadow:1px 1.5px #2d374826}.workspace-sidebar-left{background:var(--bg-sidebar);z-index:15;border-right:1.5px solid #e2d9c8;flex-direction:column;flex-shrink:0;width:250px;transition:margin-left .2s cubic-bezier(.16,1,.3,1);display:flex}.workspace-sidebar-left.collapsed{margin-left:-250px}.sidebar-left-header{border-bottom:1.5px solid #e2d9c8;justify-content:space-between;align-items:center;height:52px;padding:0 16px;display:flex}.sidebar-nav-title{color:var(--ink-primary);align-items:center;gap:6px;font-size:14px;font-weight:700;text-decoration:none;display:inline-flex}.sidebar-nav-title:hover{color:var(--pastel-purple-ink)}.sidebar-progress-badge{color:var(--pastel-green-ink);background:var(--pastel-green-bg);border:1px solid var(--pastel-green-border);border-radius:var(--radius-pill);padding:1px 8px;font-size:12px;font-weight:700}.sidebar-left-body{flex-direction:column;flex:1;gap:8px;padding:16px 12px;display:flex;overflow-y:auto}.sidebar-section-title{color:var(--ink-muted);text-transform:uppercase;letter-spacing:.04em;margin-bottom:4px;padding:0 4px;font-size:13px;font-weight:800}.tree-node-item{border-radius:var(--radius-card);color:var(--ink-secondary);cursor:pointer;background:0 0;border:1.5px solid #0000;align-items:center;gap:10px;padding:8px 12px;font-size:14px;font-weight:600;transition:all .12s;display:flex}.tree-node-item:hover{color:var(--ink-primary);box-shadow:var(--shadow-card);background:#fff;border-color:#cbd5e1}.tree-node-active{font-weight:700;background:var(--pastel-purple-pill)!important;border:1.5px solid var(--pastel-purple-border)!important;color:var(--pastel-purple-ink)!important}.tree-node-verified{color:var(--ink-primary)}.tree-node-icon{border:1.5px solid var(--ink-secondary);background:#fff;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:22px;height:22px;font-size:12px;font-weight:700;display:flex}.icon-verified{background:var(--pastel-green-bg);border-color:var(--pastel-green-ink);color:var(--pastel-green-ink)}.icon-active{background:var(--pastel-purple-ink);border-color:var(--pastel-purple-ink);color:#fff}.icon-pending{border:1.5px dashed var(--ink-muted);color:var(--ink-muted)}.sidebar-sticky-cheer{background:var(--pastel-yellow-bg);border:var(--border-pen);border-radius:var(--radius-card);box-shadow:var(--shadow-sticky);font-family:var(--font-hand);color:var(--pastel-yellow-ink);text-align:center;margin:12px 12px 38px;padding:14px 16px;font-size:16px;font-weight:700;position:relative;transform:rotate(-1.5deg)}.sidebar-sticky-cheer:before{content:"";background:var(--washi-tape-yellow);border:1px dashed #b48c1466;width:50px;height:16px;position:absolute;top:-8px;left:50%;transform:translate(-50%)}.center-scroll-container{flex:1;justify-content:center;padding:36px 32px 240px;display:flex;position:relative;overflow-y:auto}.document-prose-stream{flex-direction:column;gap:20px;width:100%;max-width:780px;display:flex}.step-badge-pill{background:var(--pastel-purple-pill);color:var(--pastel-purple-ink);border:1.5px solid var(--pastel-purple-border);border-radius:var(--radius-pill);align-items:center;gap:6px;width:fit-content;margin-bottom:8px;padding:4px 14px;font-size:14px;font-weight:700;display:inline-flex}.workspace-center-pane{background:var(--bg-app);flex-direction:column;flex:1;min-width:0;display:flex;position:relative;overflow:hidden}.center-scroll-container{background:var(--bg-app);flex:1;justify-content:center;padding:40px 48px 28px;display:flex;position:relative;overflow-y:auto}.doc-title-highlight{color:var(--ink-primary);margin-bottom:8px;font-size:34px;font-weight:800;line-height:1.25;display:inline-block;position:relative}.doc-title-highlight:after{content:"";background:var(--pastel-purple-border);opacity:.65;z-index:-1;border-radius:4px;width:100%;height:8px;position:absolute;bottom:2px;left:0;transform:rotate(-.5deg)}.explanation-article-wrap{flex-direction:column;gap:8px;margin:18px 0;display:flex;position:relative}.explanation-header-row{justify-content:space-between;align-items:center;gap:12px;margin-bottom:6px;display:flex}.doc-edited-badge{text-transform:uppercase;letter-spacing:.04em;background:var(--accent-dialogue-bg);color:var(--accent-dialogue);border:1px solid var(--accent-dialogue-border);border-radius:var(--radius-pill);padding:1px 7px;font-size:11px;font-weight:700}.explanation-edit-btn{border:1px solid var(--border-default);background:var(--bg-surface);color:var(--ink-muted);border-radius:var(--radius-sm);cursor:pointer;flex-shrink:0;padding:3px 10px;font-size:12px;font-weight:600;transition:all .15s}.explanation-edit-btn:hover{background:var(--bg-hover);color:var(--ink-primary);border-color:var(--ink-secondary)}.explanation-inline-editor{border:1.5px solid var(--ink-primary);border-radius:var(--radius-md);background:var(--bg-surface);box-shadow:var(--shadow-sm);flex-direction:column;gap:10px;padding:16px 18px;display:flex}.explanation-editor-header{color:var(--ink-muted);justify-content:space-between;align-items:center;font-size:12.5px;font-weight:700;display:flex}.explanation-editor-title{color:var(--ink-primary);border:1px solid var(--border-default);border-radius:var(--radius-sm);background:var(--bg-subtle);outline:none;padding:8px 12px;font-family:inherit;font-size:18px;font-weight:700}.explanation-editor-title:focus{border-color:var(--ink-primary)}.explanation-editor-body{color:var(--ink-primary);border:1px solid var(--border-default);border-radius:var(--radius-sm);background:var(--bg-subtle);resize:vertical;outline:none;padding:10px 12px;font-family:inherit;font-size:14.5px;line-height:1.65}.explanation-editor-body:focus{border-color:var(--ink-primary)}.explanation-editor-actions{justify-content:flex-end;align-items:center;gap:8px;margin-top:4px;display:flex}.block-inserter-divider{opacity:0;align-items:center;gap:8px;height:20px;margin:4px 0;transition:opacity .15s;display:flex}.block-inserter-divider:hover{opacity:1}.block-inserter-line{background:var(--border-default);flex:1;height:1px}.block-inserter-btn{border:1px dashed var(--border-strong);background:var(--bg-surface);color:var(--ink-muted);border-radius:var(--radius-pill);cursor:pointer;padding:2px 10px;font-size:11px;font-weight:600;transition:all 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10px;font-family:inherit;font-size:14px;line-height:1.5}.block-inserter-textarea:focus{border-color:var(--ink-primary)}.block-inserter-actions{justify-content:flex-end;align-items:center;gap:6px;display:flex}.doc-body-text{color:var(--ink-secondary);font-size:16px;font-weight:500;line-height:1.7}.doc-table-wrapper{border:var(--border-pen);border-radius:var(--radius-card);box-shadow:var(--shadow-card);background:#fff;margin:12px 0;overflow-x:auto}.doc-table{border-collapse:collapse;width:100%;font-size:15px;line-height:1.55}.doc-table th{background:var(--pastel-purple-pill);color:var(--ink-primary);text-align:left;border-bottom:var(--border-pen);white-space:nowrap;padding:10px 14px;font-weight:800}.doc-table th+th,.doc-table td+td{border-left:1px solid var(--pastel-purple-border)}.doc-table td{color:var(--ink-secondary);border-bottom:1px solid var(--bg-subtle);vertical-align:top;padding:10px 14px;font-weight:500}.doc-table tbody tr:last-child td{border-bottom:none}.doc-table tbody tr:nth-child(2n) td{background:#faf9f6}.doc-table td strong{color:var(--ink-primary)}.callout-concept-box{background:var(--pastel-green-bg);border:1.5px solid var(--pastel-green-border);border-radius:var(--radius-card);box-shadow:var(--shadow-card);align-items:flex-start;gap:12px;margin:6px 0;padding:16px 20px;display:flex}.callout-concept-icon{flex-shrink:0;font-size:22px;line-height:1}.callout-concept-title{color:var(--pastel-green-ink);margin-bottom:2px;font-size:15px;font-weight:800}.callout-concept-text{color:var(--ink-primary);font-size:15px;font-weight:600;line-height:1.55}.sketch-sticky-note{background:var(--pastel-yellow-bg);border:1.5px solid var(--pastel-yellow-border);border-radius:var(--radius-card);box-shadow:var(--shadow-sticky);margin:10px 0;padding:22px 20px 16px;transition:transform .15s,box-shadow .15s;position:relative;transform:rotate(-1deg)}.sketch-sticky-note:hover{transform:rotate(0)scale(1.01);box-shadow:2px 6px 14px #2d37481f}.washi-tape-top{background:var(--washi-tape-yellow);border:1px dashed #b48c1466;border-radius:2px;width:70px;height:18px;position:absolute;top:-8px;right:24px;transform:rotate(2deg)}.sticky-note-title{color:var(--pastel-yellow-ink);align-items:center;gap:6px;margin-bottom:6px;font-size:17px;font-weight:800;display:flex}.sticky-note-body{color:var(--ink-primary);font-size:15px;font-weight:600;line-height:1.6}.doc-section-heading{color:var(--ink-primary);align-items:center;gap:8px;margin:14px 0 6px;font-size:22px;font-weight:800;display:flex}.flowchart-container{border:var(--border-pen);border-radius:var(--radius-card);box-shadow:var(--shadow-card);background:#fff;justify-content:space-between;align-items:center;gap:12px;margin:8px 0;padding:16px 20px;display:flex;overflow-x:auto}.flowchart-step-card{border-radius:var(--radius-sm);text-align:center;border:1.5px solid;flex-direction:column;flex:1;gap:4px;min-width:130px;padding:12px 14px;display:flex}.flowchart-step-card.purple{background:var(--pastel-purple-bg);border-color:var(--pastel-purple-border);color:var(--pastel-purple-ink)}.flowchart-step-card.blue{background:var(--pastel-blue-bg);border-color:var(--pastel-blue-border);color:var(--pastel-blue-ink)}.flowchart-step-card.green{background:var(--pastel-green-bg);border-color:var(--pastel-green-border);color:var(--pastel-green-ink)}.flowchart-step-card.yellow{background:var(--pastel-yellow-bg);border-color:var(--pastel-yellow-border);color:var(--pastel-yellow-ink)}.flowchart-arrow{color:var(--ink-muted);font-size:18px;font-weight:800}.block-lesson-article{border-radius:var(--radius-sketch-sm);background:0 0;margin:16px 0;padding:8px 12px;transition:background .15s;position:relative}.block-lesson-article:hover{background:#ffffff73}.block-lesson-view{position:relative}.block-lesson-body{color:var(--ink-primary);font-size:16px;font-weight:500;line-height:1.75}.block-lesson-body p{margin:0 0 10px}.block-lesson-body p:last-child{margin-bottom:0}.block-lesson-hover-actions{opacity:0;pointer-events:none;align-items:center;gap:8px;transition:opacity .15s;display:flex;position:absolute;top:-6px;right:0}.block-lesson-article:hover .block-lesson-hover-actions{opacity:1;pointer-events:auto}.btn-text-edit-trigger{border:1px solid var(--border-pen);color:var(--ink-muted);cursor:pointer;background:#fff;border-radius:6px;padding:3px 8px;font-size:12px;font-weight:600;box-shadow:0 1px 2px #0000000a}.btn-text-edit-trigger:hover{color:var(--ink-primary);background:#f8f8fa}.block-edited-tag{color:var(--ink-muted);font-size:11.5px;font-style:italic}.block-lesson-edit-form{border:1.5px dashed var(--border-pen);border-radius:var(--radius-sketch-sm);box-shadow:var(--shadow-sketch);background:#fff;flex-direction:column;gap:10px;padding:12px;display:flex}.block-lesson-edit-textarea{width:100%;color:var(--ink-primary);border:1px solid var(--border-pen);resize:vertical;border-radius:6px;outline:none;padding:10px;font-family:inherit;font-size:15px;line-height:1.6}.block-lesson-edit-textarea:focus{border-color:var(--pastel-purple-ink)}.block-lesson-edit-footer{justify-content:space-between;align-items:center;gap:10px;display:flex}.block-lesson-edit-hint{color:var(--ink-muted);font-size:12px}.streaming-cursor{content:"";background:var(--pastel-purple-ink);vertical-align:text-bottom;width:2.5px;height:1.1em;margin-left:3px;animation:.7s step-end infinite blink-cursor;display:inline-block}@keyframes blink-cursor{0%,to{opacity:1}50%{opacity:0}}.block-inquiry-callout{background:var(--pastel-purple-bg,#f7f5ff);border:1.5px dashed var(--pastel-purple-border,#ddd6fe);border-radius:var(--radius-sketch-md,12px);flex-direction:column;gap:8px;margin:18px 0;padding:14px 18px;transition:box-shadow .15s;display:flex;position:relative}.block-inquiry-callout:hover{box-shadow:0 2px 8px #7c3aed0f}.inquiry-callout-header{justify-content:space-between;align-items:center;display:flex}.inquiry-callout-title{letter-spacing:.02em;color:var(--pastel-purple-ink,#6d28d9);text-transform:uppercase;align-items:center;gap:6px;font-size:12.5px;font-weight:700;display:flex}.inquiry-callout-icon{font-size:14px}.inquiry-edited-pill{text-transform:none;color:var(--pastel-purple-ink,#6d28d9);background:#7c3aed1f;border-radius:10px;padding:1px 6px;font-size:10.5px;font-weight:600}.inquiry-edit-btn{border:1px solid var(--pastel-purple-border,#ddd6fe);color:var(--pastel-purple-ink,#6d28d9);cursor:pointer;opacity:0;background:#ffffffd9;border-radius:6px;padding:2px 8px;font-size:11.5px;font-weight:600;transition:opacity .15s}.block-inquiry-callout:hover .inquiry-edit-btn{opacity:1}.inquiry-callout-body{color:var(--ink-primary);font-size:16px;font-weight:600;line-height:1.6}.inquiry-edit-form{flex-direction:column;gap:8px;display:flex}.inquiry-edit-textarea{border:1px solid var(--pastel-purple-border,#ddd6fe);width:100%;color:var(--ink-primary);background:#fff;border-radius:6px;outline:none;padding:8px 12px;font-family:inherit;font-size:15px;font-weight:600;line-height:1.5}.inquiry-edit-actions{justify-content:flex-end;gap:8px;display:flex}.checkpoint-block{box-shadow:none;background:0 0;border:none;border-top:1.5px dashed #cbd5e1;border-radius:0;flex-direction:column;gap:16px;margin:16px 0;padding:24px 0 14px;display:flex}.plan-card-block{box-shadow:var(--shadow-sm);background:var(--bg-surface)!important;border:1.5px solid var(--border-default)!important;border-radius:var(--radius-md)!important;margin:18px 0!important;padding:18px 20px!important}.plan-card-intro{color:var(--ink-secondary);margin-top:-4px;font-size:14.5px;line-height:1.6}.plan-node-list{flex-direction:column;gap:8px;display:flex}.plan-node-item{border-radius:var(--radius-md);border:1px solid var(--border-default);background:var(--bg-surface);align-items:flex-start;gap:12px;padding:12px 14px;transition:all .15s;display:flex}.plan-node-index{background:var(--bg-subtle);width:24px;height:24px;color:var(--ink-primary);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;margin-top:1px;font-size:12px;font-weight:700;display:flex}.plan-node-item.is-verified{background:var(--accent-verified-bg);border-color:var(--accent-verified-border)}.plan-node-item.is-verified .plan-node-index{background:var(--accent-verified);color:#fff}.plan-node-info{flex-direction:column;flex:1;gap:2px;display:flex}.plan-node-name{color:var(--ink-primary);flex-wrap:wrap;align-items:center;gap:8px;font-size:14.5px;font-weight:600;display:flex}.plan-node-desc{color:var(--ink-muted);font-size:13px;line-height:1.5}.plan-node-delete-btn{color:var(--ink-muted);cursor:pointer;background:0 0;border:none;border-radius:4px;padding:4px 6px;font-size:13px;line-height:1;transition:all .15s}.plan-node-delete-btn:hover{background:var(--accent-gap-bg);color:var(--accent-gap)}.plan-new-pill{text-transform:uppercase;background:var(--accent-dialogue-bg);color:var(--accent-dialogue);border:1px solid var(--accent-dialogue-border);border-radius:var(--radius-pill);padding:1px 6px;font-size:10.5px;font-weight:700}.plan-verified-pill{text-transform:uppercase;background:var(--accent-verified-bg);color:var(--accent-verified);border:1px solid var(--accent-verified-border);border-radius:var(--radius-pill);padding:1px 6px;font-size:10.5px;font-weight:700}.plan-card-footer{border-top:1px solid var(--border-default);flex-direction:column;gap:8px;margin-top:14px;padding-top:14px;display:flex}.plan-approve-btn{border-radius:var(--radius-md);justify-content:center;width:100%;padding:12px 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