:root{--bg-primary: #09090b;--bg-secondary: rgba(24, 24, 27, .6);--bg-tertiary: rgba(39, 39, 42, .5);--bg-editor: rgba(9, 9, 11, .7);--bg-input: rgba(0, 0, 0, .3);--bg-hover: rgba(255, 255, 255, .08);--border-color: rgba(255, 255, 255, .08);--border-light: rgba(255, 255, 255, .15);--text-primary: #fafafa;--text-secondary: #a1a1aa;--text-muted: #71717a;--accent-brand: #a3e635;--accent-brand-hover: #84cc16;--accent-brand-dim: rgba(163, 230, 53, .15);--accent-green: #a3e635;--accent-green-dim: rgba(163, 230, 53, .15);--accent-blue: #3b82f6;--diff-easy: #a3e635;--diff-medium: #f59e0b;--diff-hard: #ef4444;--font-sans: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;--font-mono: "JetBrains Mono", "Fira Code", monospace;--radius: 12px;--radius-sm: 6px;--sidebar-width: 320px;--nav-height: 56px;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -1px rgba(0, 0, 0, .06);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -2px rgba(0, 0, 0, .05);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .3), 0 10px 10px -5px rgba(0, 0, 0, .2);--glass-blur: blur(24px)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-sans);background-color:var(--bg-primary);background-image:radial-gradient(circle at 15% 50%,rgba(163,230,53,.05),transparent 25%),radial-gradient(circle at 85% 30%,rgba(59,130,246,.05),transparent 25%);background-attachment:fixed;color:var(--text-primary);margin:0;padding:0;overflow:hidden;height:100vh}pre,code{font-family:var(--font-mono)}.top-nav{display:flex;align-items:center;height:var(--nav-height);padding:0 20px;background-color:var(--bg-secondary);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border-bottom:1px solid var(--border-color);gap:16px;flex-shrink:0;z-index:100}.nav-brand{display:flex;align-items:center;gap:10px;flex-shrink:0;cursor:default;-webkit-user-select:none;user-select:none}.brand-icon{font-size:1.4rem;filter:drop-shadow(0 2px 8px var(--accent-brand-dim))}.brand-name{font-family:var(--font-sans);font-weight:800;font-size:1.1rem;color:var(--accent-brand);letter-spacing:1.5px;text-shadow:0 2px 10px var(--accent-brand-dim)}.lesson-progress-bar{flex:1;display:flex;align-items:center;gap:12px;min-width:0}.progress-info{display:flex;align-items:center;gap:12px;min-width:0}.progress-title{font-size:.8rem;font-weight:600;color:var(--text-primary);white-space:nowrap;cursor:pointer;padding:3px 8px;border-radius:var(--radius-sm);transition:background .15s,color .15s;display:inline-flex;align-items:center;gap:5px;border:1px solid transparent}.progress-title:after{content:"";display:inline-block;width:0;height:0;border-left:4px solid transparent;border-right:4px solid transparent;border-top:5px solid currentColor;opacity:.45;transition:opacity .15s,transform .15s;flex-shrink:0}.progress-title:hover{background:var(--bg-hover);color:var(--accent-blue);border-color:var(--border-color)}.progress-title:hover:after{opacity:1}.progress-text{font-size:.75rem;color:var(--text-secondary);white-space:nowrap}.progress-track{flex:1;min-width:0}.progress-dots{display:flex;gap:6px;align-items:center}.progress-dot{width:24px;height:6px;border-radius:3px;background-color:var(--border-color);transition:all .2s;cursor:pointer;position:relative}.progress-dot:hover{transform:scaleY(1.5)}.progress-dot.completed{background-color:var(--accent-green)}.progress-dot.current{background-color:var(--accent-blue);box-shadow:0 0 8px #3b82f680}.progress-dot.easy{border-bottom:2px solid var(--diff-easy)}.progress-dot.medium{border-bottom:2px solid var(--diff-medium)}.progress-dot.hard{border-bottom:2px solid var(--diff-hard)}.nav-actions{display:flex;gap:8px;flex-shrink:0}.nav-btn{background:transparent;border:1px solid transparent;color:var(--text-secondary);width:36px;height:36px;border-radius:var(--radius-sm);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .2s ease}.nav-btn:hover{background-color:var(--bg-hover);color:var(--text-primary);border-color:var(--border-color)}.main-container{display:grid;grid-template-columns:var(--sidebar-width) 1fr;height:calc(100vh - var(--nav-height));overflow:hidden}.main-container.chat-collapsed{grid-template-columns:0px 1fr}.workspace{display:flex;overflow:hidden;min-width:0}.chat-panel{background-color:var(--bg-secondary);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border-right:1px solid var(--border-color);display:flex;flex-direction:column;overflow:hidden;transition:width .2s ease,opacity .2s ease;width:var(--sidebar-width);min-width:0}.chat-panel.collapsed{width:0!important;min-width:0!important;border-right:0;overflow:hidden}.chat-panel.collapsed>*{opacity:0;pointer-events:none}.sidebar-section{padding:16px 20px;border-bottom:1px solid var(--border-color)}.sidebar-section.sidebar-chat{flex:1;display:flex;flex-direction:column;min-height:0;overflow:hidden}.sidebar-heading{font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:1px;color:var(--text-muted);margin-bottom:12px}.chat-input-area{display:flex;flex-direction:column;gap:8px}textarea#chat-input{width:100%;background-color:var(--bg-input);border:1px solid var(--border-color);border-radius:var(--radius-sm);color:var(--text-primary);font-family:var(--font-sans);font-size:.85rem;padding:10px 12px;resize:none;transition:all .2s ease;box-shadow:inset 0 1px 2px #0003;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}textarea#chat-input:focus{outline:none;border-color:var(--accent-brand);box-shadow:0 0 0 2px var(--accent-brand-dim),inset 0 1px 2px #0003}.btn-primary{background-color:var(--accent-brand);color:#09090b;border:none;border-radius:var(--radius-sm);padding:10px 16px;font-family:var(--font-sans);font-size:.85rem;font-weight:700;cursor:pointer;transition:all .2s ease;width:100%;box-shadow:0 2px 8px var(--accent-brand-dim)}.btn-primary:hover:not(:disabled){background-color:var(--accent-brand-hover);transform:translateY(-1px);box-shadow:0 4px 12px var(--accent-brand-dim)}.btn-primary:active:not(:disabled){transform:translateY(0);box-shadow:0 1px 2px var(--accent-brand-dim)}.btn-primary:disabled{opacity:.6;cursor:not-allowed;filter:grayscale(.5)}.btn-secondary{background-color:transparent;color:var(--text-primary);border:1px solid var(--border-color);border-radius:var(--radius-sm);padding:8px 16px;font-family:var(--font-sans);font-size:.8rem;font-weight:500;cursor:pointer;transition:all .2s ease}.btn-secondary:hover{background-color:var(--bg-hover);border-color:var(--border-light)}.problem-history-list{max-height:200px;overflow-y:auto;display:flex;flex-direction:column;gap:2px}.history-item{position:relative;display:flex;justify-content:space-between;align-items:center;padding:10px 12px;border-radius:var(--radius-sm);cursor:pointer;transition:all .2s ease;font-size:.85rem;color:var(--text-secondary);border:1px solid transparent}.history-item-title{flex:1;margin-right:8px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.history-item:hover{background-color:var(--bg-hover);color:var(--text-primary);border-color:var(--border-color)}.history-item.active{background-color:var(--accent-brand-dim);color:var(--accent-brand);font-weight:600;border-color:var(--accent-brand-dim)}.history-item-controls{display:flex;gap:2px;opacity:0;transition:opacity .15s;flex-shrink:0}.history-item:hover .history-item-controls{opacity:1}.curriculum-plan-item{border-left:2px solid var(--accent-blue)}.history-draft-badge{display:inline-block;background:#3b82f626;color:var(--accent-blue);font-size:.6rem;font-weight:600;padding:1px 6px;border-radius:8px;text-transform:uppercase;letter-spacing:.03em;flex-shrink:0;margin-right:6px}.history-control-btn{background:none;border:none;color:var(--text-muted);cursor:pointer;padding:2px 6px;font-size:12px;transition:color .15s;line-height:1;border-radius:2px}.history-control-btn:hover{color:var(--text-primary);background-color:#ffffff1a}.history-control-btn.delete-btn:hover{color:var(--diff-hard)}.no-history{color:var(--text-muted);font-size:.8rem;padding:8px 0}.chat-history{flex:1;padding:12px 0;overflow-y:auto;display:flex;flex-direction:column;gap:8px}.ai-message,.user-message{padding:10px 14px;border-radius:var(--radius);font-size:.85rem;line-height:1.6;max-width:90%;box-shadow:var(--shadow-sm)}.ai-message{background-color:var(--bg-tertiary);align-self:flex-start;color:var(--text-primary);border-bottom-left-radius:2px}.user-message{background-color:var(--accent-brand);color:#09090b;font-weight:500;align-self:flex-end;border-bottom-right-radius:2px}.panel-resizer{width:4px;cursor:col-resize;background:var(--border-color);flex-shrink:0;transition:background .2s ease,width .2s ease;position:relative;z-index:10}.panel-resizer:hover,.panel-resizer.dragging{background:var(--accent-brand);width:6px}.editor-resizer{height:4px;cursor:row-resize;background:var(--border-color);flex-shrink:0;transition:background .2s ease,height .2s ease;z-index:10}.editor-resizer:hover,.editor-resizer.dragging{background:var(--accent-brand);height:6px}.problem-panel{display:flex;flex-direction:column;overflow:hidden;flex:1 1 50%;min-width:0}.problem-panel.collapsed{display:none!important}.problem-panel.collapsed+.panel-resizer{display:none!important}.problem-panel-header{padding:16px 20px 0;flex-shrink:0}.problem-title-row{display:flex;align-items:center;gap:10px;margin-bottom:12px}.problem-title-text{font-size:1.25rem;font-weight:700;color:var(--text-primary);line-height:1.4;letter-spacing:-.01em}.difficulty-badge{display:inline-block;padding:2px 10px;border-radius:12px;font-size:.7rem;font-weight:600;text-transform:capitalize;flex-shrink:0}.difficulty-badge.easy{background-color:#10b98126;color:var(--diff-easy)}.difficulty-badge.medium{background-color:#f59e0b26;color:var(--diff-medium)}.difficulty-badge.hard{background-color:#ef444426;color:var(--diff-hard)}.problem-tabs{display:flex;gap:16px;border-bottom:1px solid var(--border-color);padding:0 4px}.tab-btn{background:none;border:none;border-bottom:2px solid transparent;color:var(--text-muted);padding:10px 4px;font-family:var(--font-sans);font-size:.85rem;font-weight:500;cursor:pointer;transition:all .2s ease;margin-bottom:-1px}.tab-btn:hover{color:var(--text-primary)}.tab-btn.active{color:var(--accent-brand);border-bottom-color:var(--accent-brand);font-weight:600}.problem-panel-body{flex:1;overflow-y:auto;padding:20px}.tab-content{display:none}.tab-content.active{display:block}.problem-section{line-height:1.7}.problem-description-content{font-size:.9rem;line-height:1.7;color:var(--text-primary)}.problem-description-content p{margin-bottom:1rem}.problem-description-content h1,.problem-description-content h2,.problem-description-content h3{margin:1.2rem 0 .6rem;color:var(--text-primary)}.problem-description-content table{border-collapse:collapse;width:100%;margin:1rem 0}.problem-description-content th,.problem-description-content td{border:1px solid var(--border-color);padding:8px 12px;text-align:left;font-size:.85rem}.problem-description-content th{background-color:#ffffff08;font-weight:600}.learning-materials{overflow:auto;max-width:100%}#problem-set-content{font-family:var(--font-sans);font-size:.9rem;line-height:1.7;word-wrap:break-word;color:var(--text-primary)}#problem-set-content h1,#problem-set-content h2,#problem-set-content h3,#problem-set-content h4,#problem-set-content h5{margin:1.2rem 0 .5rem;color:var(--text-primary)}#problem-set-content p{margin-bottom:.8rem}#problem-set-content strong{color:var(--accent-green);font-weight:600}#problem-set-content pre{background-color:#282c34;border-radius:var(--radius);margin:.8rem 0;overflow-x:auto;max-width:100%}#problem-set-content pre code.hljs{background:transparent;color:inherit;font-family:var(--font-mono);font-size:.85rem;line-height:1.5;white-space:pre;display:block;padding:12px 16px}#problem-set-content :not(pre)>code{font-family:var(--font-mono);background-color:#8b949e26;padding:2px 6px;font-size:85%;border-radius:var(--radius-sm);color:#e5c07b}#problem-set-content ul,#problem-set-content ol{padding-left:1.5rem;margin:.5rem 0}#problem-set-content li{margin-bottom:.4rem}.lesson-navigation{margin-top:32px;padding:20px;background:#a3e6350d;border:1px solid var(--accent-brand-dim);border-radius:var(--radius);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.lesson-nav-controls{display:flex;justify-content:space-between;align-items:center}.lesson-nav-controls button{background:var(--accent-brand);color:#09090b;border:none;padding:10px 24px;font-family:var(--font-sans);font-weight:700;font-size:.85rem;cursor:pointer;border-radius:var(--radius-sm);transition:all .2s ease;box-shadow:0 2px 8px var(--accent-brand-dim)}.lesson-nav-controls button:hover:not(:disabled){background:var(--accent-brand-hover);transform:translateY(-1px);box-shadow:0 4px 12px var(--accent-brand-dim)}.lesson-nav-controls button:active:not(:disabled){transform:translateY(0)}.lesson-nav-controls button:disabled{background:var(--bg-tertiary);color:var(--text-muted);box-shadow:none;cursor:not-allowed}.lesson-counter{font-family:var(--font-mono);font-size:.85rem;color:var(--text-secondary)}.solution-panel{display:flex;flex-direction:column;overflow:hidden;background-color:var(--bg-editor);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);flex:1 1 50%;min-width:0}.editor-section{flex:1 1 0;min-height:0;display:flex;flex-direction:column}.editor-header{display:flex;justify-content:space-between;align-items:center;padding:10px 16px;background-color:var(--bg-secondary);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border-bottom:1px solid var(--border-color)}.editor-header-left{display:flex;align-items:center;gap:8px}.editor-label{font-size:.75rem;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:1px}.editor-controls{display:flex;gap:4px}.editor-btn{background:transparent;border:1px solid transparent;color:var(--text-muted);width:32px;height:32px;padding:0;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-sm);cursor:pointer;transition:all .2s ease}.editor-btn:hover{background-color:var(--bg-hover);border-color:var(--border-color);color:var(--text-primary)}.cm-editor{flex-grow:1;height:100%;overflow:hidden;font-family:var(--font-mono);font-size:.9rem}.cm-editor.cm-focused{outline:none!important}.cm-matchingBracket{background-color:#10b98133!important;border-bottom:1px solid var(--accent-green);color:inherit!important}.cm-nonmatchingBracket{background-color:#ef444433!important}.output-section{display:flex;flex-direction:column;flex:0 0 200px;min-height:80px;overflow:hidden}.output-header{display:flex;align-items:center;justify-content:space-between;padding:8px 16px;background-color:var(--bg-secondary);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border-bottom:1px solid var(--border-color)}.output-tabs{display:flex;gap:0}.output-tab{font-size:.75rem;font-weight:500;color:var(--text-muted);padding:4px 0}.output-tab.active{color:var(--text-primary)}.output-actions{display:flex;gap:6px;align-items:center}.btn-run{display:flex;align-items:center;gap:6px;background-color:var(--accent-brand);color:#09090b;border:none;border-radius:var(--radius-sm);padding:6px 14px;font-family:var(--font-sans);font-size:.8rem;font-weight:700;cursor:pointer;transition:all .2s ease;box-shadow:0 2px 8px var(--accent-brand-dim)}.btn-run:hover:not(:disabled){background-color:var(--accent-brand-hover);transform:translateY(-1px);box-shadow:0 4px 12px var(--accent-brand-dim)}.btn-run:active:not(:disabled){transform:translateY(0)}.btn-run:disabled{opacity:.6;cursor:not-allowed;filter:grayscale(.5)}.output-toggle-btn{background:transparent;border:1px solid transparent;color:var(--text-muted);border-radius:var(--radius-sm);width:30px;height:30px;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .2s ease;padding:0}.output-toggle-btn:hover{background-color:var(--bg-hover);border-color:var(--border-color);color:var(--text-primary)}#output{background-color:transparent;padding:12px 16px;flex:1;overflow-y:auto;word-wrap:break-word;font-family:var(--font-sans);font-size:.85rem;line-height:1.6;color:var(--text-secondary)}#output pre{background-color:#282c34;border-radius:var(--radius-sm);margin:.5rem 0;overflow-x:auto}#output pre code.hljs{background:transparent;font-family:var(--font-mono);font-size:.8rem;line-height:1.4;display:block;padding:8px 12px}#output :not(pre)>code{font-family:var(--font-mono);background-color:#8b949e26;padding:2px 4px;font-size:85%;border-radius:3px}#output p{margin:.4rem 0}#output ul,#output ol{padding-left:1.5rem;margin:.4rem 0}body.resizing{-webkit-user-select:none;user-select:none;cursor:col-resize}body.resizing-v{cursor:row-resize}.pigwise-chat-popup{position:fixed;bottom:24px;right:24px;width:400px;height:500px;min-width:300px;min-height:200px;max-width:90vw;max-height:80vh;background-color:#18181bbf;backdrop-filter:blur(24px);-webkit-backdrop-filter:blur(24px);border:1px solid var(--border-light);border-radius:16px;box-shadow:var(--shadow-xl),inset 0 1px 1px #ffffff0d;display:flex;flex-direction:column;z-index:1000;transition:opacity .2s ease,transform .2s ease;resize:both;overflow:auto}.pigwise-header{display:flex;justify-content:space-between;align-items:center;padding:12px 16px;background-color:transparent;border-bottom:1px solid var(--border-color);cursor:move;flex-shrink:0;border-radius:16px 16px 0 0}.pigwise-header h3{font-size:.8rem;font-weight:600;color:var(--text-primary);letter-spacing:.5px}.pigwise-header-controls{display:flex;gap:4px;align-items:center}.pigwise-control-btn{background:none;border:1px solid var(--border-color);color:var(--text-muted);width:24px;height:24px;border-radius:var(--radius-sm);cursor:pointer;display:flex;align-items:center;justify-content:center;padding:0;transition:all .15s}.pigwise-control-btn:hover{background-color:var(--border-color);color:var(--text-primary)}.pigwise-chat-body{display:flex;flex-direction:column;flex-grow:1;overflow:hidden;min-height:0}.pigwise-chat-history{flex-grow:1;padding:12px;overflow-y:auto;display:flex;flex-direction:column;gap:8px}.pigwise-chat-history .ai-message pre{background-color:#282c34;border-radius:var(--radius-sm);margin:.5rem 0;overflow-x:auto;max-width:100%}.pigwise-chat-history .ai-message pre code.hljs{background:transparent;font-family:var(--font-mono);font-size:.8rem;line-height:1.4;white-space:pre;display:block;padding:10px}.pigwise-chat-history .ai-message :not(pre)>code{font-family:var(--font-mono);background-color:#8b949e26;padding:2px 6px;font-size:85%;border-radius:var(--radius-sm)}.pigwise-chat-history .ai-message ul,.pigwise-chat-history .ai-message ol{padding-left:1.5rem;margin:.5rem 0}.pigwise-chat-history .ai-message li{margin-bottom:.3rem}.pigwise-chat-input-area{display:flex;align-items:flex-end;padding:10px;border-top:1px solid var(--border-color);gap:8px;flex-shrink:0}#pigwise-chat-input,#hint-chat-input{flex-grow:1;background-color:var(--bg-input);border:1px solid var(--border-color);border-radius:var(--radius-sm);color:var(--text-primary);font-family:var(--font-sans);font-size:.8rem;padding:8px 10px;transition:border-color .2s;resize:none;overflow-y:auto;min-height:36px;max-height:150px;line-height:1.4;field-sizing:content}#pigwise-chat-input:focus,#hint-chat-input:focus{outline:none;border-color:var(--accent-green)}#pigwise-send-btn,#hint-send-btn{background-color:var(--accent-brand);color:#09090b;border:none;border-radius:var(--radius-sm);padding:10px 16px;font-family:var(--font-sans);font-size:.85rem;font-weight:700;cursor:pointer;transition:all .2s ease;flex-shrink:0;align-self:flex-end;box-shadow:0 2px 8px var(--accent-brand-dim)}#pigwise-send-btn:hover,#hint-send-btn:hover{background-color:var(--accent-brand-hover);transform:translateY(-1px);box-shadow:0 4px 12px var(--accent-brand-dim)}#pigwise-send-btn:active,#hint-send-btn:active{transform:translateY(0)}.pigwise-chat-popup.minimized{height:48px;min-height:48px;width:200px;resize:none;overflow:hidden;transition:all .3s cubic-bezier(.4,0,.2,1);border-radius:24px}.pigwise-chat-popup.minimized .pigwise-chat-body,.pigwise-chat-popup.minimized #pigwise-popout-btn{display:none}.pigwise-chat-popup.minimized .pigwise-header{border-radius:24px;padding:12px 16px;border-bottom:none}.hint-window-body{display:flex;flex-direction:column;height:100vh;overflow:hidden}.hint-window-header{display:flex;align-items:center;padding:10px 16px;background-color:var(--bg-primary);border-bottom:1px solid var(--border-color);flex-shrink:0}.hint-window-brand{display:flex;align-items:center;gap:8px}.hint-window-brand .brand-icon{font-size:1.2rem}.hint-window-brand h3{font-size:.9rem;font-weight:600;color:var(--text-primary);letter-spacing:.5px}.hint-window-chat{display:flex;flex-direction:column;flex-grow:1;overflow:hidden;min-height:0}.hint-window-chat .pigwise-chat-history{flex-grow:1;padding:16px;overflow-y:auto;display:flex;flex-direction:column;gap:10px}.hint-window-chat .pigwise-chat-input-area{padding:12px 16px}.hint-window-chat #hint-chat-input{font-size:.85rem;padding:10px 12px}.hint-window-chat #hint-send-btn{padding:10px 18px;font-size:.85rem}.modal{display:none;position:fixed;z-index:2000;left:0;top:0;width:100%;height:100%;background-color:#0009;justify-content:center;align-items:center;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.modal-content{background-color:#18181bbf;backdrop-filter:blur(24px);-webkit-backdrop-filter:blur(24px);padding:24px;border:1px solid var(--border-light);border-radius:12px;min-width:400px;box-shadow:var(--shadow-xl),inset 0 1px 1px #ffffff0d}.modal-content h3{margin-bottom:16px;color:var(--text-primary);font-size:1rem;font-weight:600}.modal-content input{width:100%;padding:10px 12px;margin:8px 0;background-color:var(--bg-input);border:1px solid var(--border-color);border-radius:var(--radius-sm);color:var(--text-primary);font-family:var(--font-sans);font-size:.85rem;transition:border-color .2s}.modal-content input:focus{outline:none;border-color:var(--accent-green)}.modal-buttons{display:flex;gap:8px;justify-content:flex-end;margin-top:16px}.modal-buttons button{padding:8px 20px;cursor:pointer;border-radius:var(--radius-sm);font-family:var(--font-sans);font-size:.85rem;font-weight:500}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border-light);border-radius:4px;border:2px solid var(--bg-primary)}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}.problem-description-content pre{background-color:#282c34;border-radius:var(--radius);margin:.8rem 0;overflow-x:auto}.problem-description-content pre code.hljs{background:transparent;font-family:var(--font-mono);font-size:.85rem;line-height:1.5;display:block;padding:12px 16px}.problem-description-content :not(pre)>code{font-family:var(--font-mono);background-color:#8b949e26;padding:2px 6px;font-size:85%;border-radius:var(--radius-sm);color:#e5c07b}.problem-description-content ul,.problem-description-content ol{padding-left:1.5rem;margin:.5rem 0}.problem-description-content li{margin-bottom:.3rem}@media (max-width: 1200px){:root{--sidebar-width: 250px}}@media (max-width: 900px){.main-container{grid-template-columns:1fr}.chat-panel{display:none}}.toast-container{position:fixed;bottom:20px;left:50%;transform:translate(-50%);z-index:9999;display:flex;flex-direction:column-reverse;gap:8px;pointer-events:none}.toast{pointer-events:auto;display:flex;align-items:center;gap:8px;padding:10px 18px;border-radius:var(--radius);font-family:var(--font-sans);font-size:.8rem;font-weight:500;color:var(--text-primary);background-color:var(--bg-secondary);border:1px solid var(--border-color);box-shadow:0 4px 16px #0006;animation:toast-in .2s ease-out,toast-out .2s ease-in forwards;animation-delay:0s,var(--toast-duration, 3s);white-space:nowrap}.toast.success{border-color:var(--accent-green);background-color:#10b9811a}.toast.success .toast-icon{color:var(--accent-green)}.toast.error{border-color:var(--diff-hard);background-color:#ef44441a}.toast.error .toast-icon{color:var(--diff-hard)}.toast.info{border-color:var(--accent-blue);background-color:#3b82f61a}.toast.info .toast-icon{color:var(--accent-blue)}.toast-icon{font-size:1rem;flex-shrink:0}@keyframes toast-in{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}@keyframes toast-out{0%{opacity:1;transform:translateY(0)}to{opacity:0;transform:translateY(-8px)}}.input-mode-tabs{display:flex;gap:4px;margin-bottom:12px;background:var(--bg-input);padding:4px;border-radius:var(--radius-sm);border:1px solid var(--border-color)}.input-tab{flex:1;background:transparent;border:none;color:var(--text-muted);padding:6px 0;font-family:var(--font-sans);font-size:.75rem;font-weight:500;cursor:pointer;transition:all .2s ease;border-radius:4px}.input-tab.active{background-color:var(--bg-tertiary);color:var(--text-primary);box-shadow:var(--shadow-sm)}.input-tab:hover:not(.active){background-color:#ffffff08}#repo-url-input{width:100%;background-color:var(--bg-input);border:1px solid var(--border-color);border-radius:var(--radius-sm);color:var(--text-primary);font-family:var(--font-sans);font-size:.85rem;padding:10px 12px;transition:all .2s ease;box-shadow:inset 0 1px 2px #0003;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}#repo-url-input:focus{outline:none;border-color:var(--accent-brand);box-shadow:0 0 0 2px var(--accent-brand-dim),inset 0 1px 2px #0003}.ontological-map{position:fixed;top:var(--nav-height);left:0;right:0;bottom:0;background-color:#09090bd9;backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);z-index:500;display:flex;flex-direction:column}.map-toolbar{display:flex;align-items:center;gap:16px;padding:8px 16px;background-color:var(--bg-secondary);border-bottom:1px solid var(--border-color);flex-shrink:0}.map-title{font-family:var(--font-mono);font-weight:600;font-size:.85rem;color:var(--text-primary)}.map-hint{font-size:.7rem;color:var(--text-muted);margin-left:auto}.map-canvas{flex:1;overflow:hidden;position:relative}.map-canvas svg{width:100%;height:100%}.map-zoom-controls{position:absolute;bottom:16px;right:16px;display:flex;flex-direction:column;gap:4px;z-index:10}.map-zoom-btn{width:36px;height:36px;border-radius:8px;border:1px solid var(--border-color);background:var(--bg-secondary);color:var(--text-primary);font-size:18px;font-weight:700;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .15s;line-height:1}.map-zoom-btn:hover{background:var(--bg-tertiary, var(--border-color))}.map-zoom-reset{font-size:16px}.map-node circle{stroke-width:2;cursor:pointer;transition:r .2s}.map-node circle:hover{filter:brightness(1.3)}.map-node text{font-family:var(--font-sans);font-size:10px;fill:var(--text-secondary);pointer-events:none;text-anchor:middle}.map-node .lesson-index{fill:#000;stroke:#fff;stroke-width:2.5px;paint-order:stroke;font-size:10px;font-weight:800}.map-link{stroke:var(--border-color);stroke-width:1.5;fill:none;opacity:.6}.map-cluster-label{font-family:var(--font-mono);font-size:12px;font-weight:600;fill:var(--text-primary);text-anchor:middle}.map-manage-wrapper{position:relative}.map-manage-panel{position:absolute;top:100%;left:0;margin-top:4px;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:8px;width:280px;max-height:360px;overflow-y:auto;box-shadow:0 8px 24px #0006;z-index:600}.map-manage-header{padding:10px 14px;font-size:.75rem;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px;border-bottom:1px solid var(--border-color)}.map-manage-list{padding:4px 0}.map-manage-row{display:flex;align-items:center;justify-content:space-between;padding:8px 14px;gap:10px}.map-manage-row:hover{background:var(--bg-hover)}.map-manage-label{font-size:.8rem;color:var(--text-primary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;flex:1;min-width:0}.map-manage-toggle{flex-shrink:0;padding:3px 10px;font-size:.7rem;font-weight:600;border:1px solid var(--border-color);border-radius:4px;background:transparent;color:var(--text-muted);cursor:pointer;transition:all .15s}.map-manage-toggle.active{background:var(--accent-color, #3b82f6);border-color:var(--accent-color, #3b82f6);color:#fff}.map-manage-toggle:hover{border-color:var(--accent-color, #3b82f6)}.map-manage-empty{padding:16px 14px;font-size:.8rem;color:var(--text-muted);text-align:center}.curriculum-plan{padding:20px;display:flex;flex-direction:column;gap:16px;height:100%;overflow-y:auto}.curriculum-plan-header{margin-bottom:4px}.curriculum-plan-title{font-size:1.1rem;font-weight:700;color:var(--text-primary);margin-bottom:4px}.curriculum-plan-subtitle{font-size:.8rem;color:var(--text-muted)}.curriculum-lessons{display:flex;flex-direction:column;gap:8px}.curriculum-lesson{display:flex;gap:16px;padding:16px;border-radius:var(--radius);border:1px solid var(--border-color);background:var(--bg-secondary);transition:all .2s ease;box-shadow:var(--shadow-sm)}.curriculum-lesson:hover{border-color:var(--border-light);transform:translateY(-1px);box-shadow:var(--shadow-md)}.curriculum-lesson.easy{border-left:3px solid var(--diff-easy)}.curriculum-lesson.medium{border-left:3px solid var(--diff-medium)}.curriculum-lesson.hard{border-left:3px solid var(--diff-hard)}.curriculum-lesson-number{width:24px;height:24px;border-radius:50%;background:var(--border-color);color:var(--text-secondary);display:flex;align-items:center;justify-content:center;font-size:.75rem;font-weight:600;flex-shrink:0;margin-top:2px}.curriculum-lesson-details{flex:1;min-width:0}.curriculum-lesson-header{display:flex;align-items:center;gap:8px;margin-bottom:4px}.curriculum-lesson-title{font-size:.85rem;font-weight:600;color:var(--text-primary)}.curriculum-lesson-objective{font-size:.78rem;color:var(--text-secondary);margin-bottom:4px;line-height:1.4}.curriculum-lesson-concepts{font-size:.72rem;color:var(--text-muted);font-family:var(--font-mono);line-height:1.4}.curriculum-feedback{display:flex;gap:8px;align-items:flex-end}.curriculum-feedback-input{flex:1;background:var(--bg-input);color:var(--text-primary);border:1px solid var(--border-color);border-radius:var(--radius-sm);padding:8px 12px;font-family:var(--font-sans);font-size:.8rem;resize:vertical;min-height:38px}.curriculum-feedback-input:focus{outline:none;border-color:var(--accent-green)}.btn-refine{flex-shrink:0;height:38px}.curriculum-actions{padding-top:8px;position:sticky;bottom:0;background:var(--bg-primary);padding-bottom:4px}.btn-generate-problems{font-size:.9rem;padding:12px 24px}.thinking-container{padding:0}.thinking-header{display:flex;align-items:center;gap:8px;margin-bottom:12px;color:var(--text-muted);font-size:.8rem;font-weight:500}.thinking-spinner{width:14px;height:14px;border:2px solid var(--border-color);border-top-color:var(--accent-blue);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.thinking-trace{font-family:var(--font-mono);font-size:.75rem;line-height:1.6;color:var(--text-muted);background-color:#0003;border:1px solid var(--border-color);border-radius:var(--radius);padding:12px 16px;max-height:400px;overflow-y:auto;white-space:pre-wrap;word-break:break-word}.shortcut-hint{font-size:.65rem;color:var(--text-muted);font-family:var(--font-mono);margin-left:4px}.btn-run .shortcut-hint{opacity:.7}.curriculum-overview-dropdown{position:fixed;top:64px;left:50%;transform:translate(-50%);width:460px;max-height:70vh;background:#09090bd9;backdrop-filter:blur(24px);-webkit-backdrop-filter:blur(24px);border:1px solid var(--border-light);border-radius:var(--radius);box-shadow:var(--shadow-xl),inset 0 1px 1px #ffffff0d;z-index:1000;overflow:hidden;display:flex;flex-direction:column}.curriculum-overview-header{padding:14px 16px 10px;border-bottom:1px solid var(--border-color)}.curriculum-overview-header h3{font-size:.9rem;font-weight:700;color:var(--text-primary);margin:0}.curriculum-overview-lessons{overflow-y:auto;padding:8px;display:flex;flex-direction:column;gap:4px}.curriculum-overview-item{display:flex;align-items:flex-start;gap:10px;padding:10px 12px;border-radius:var(--radius-sm);cursor:pointer;transition:background .15s;border:1px solid transparent}.curriculum-overview-item:hover{background:var(--bg-hover);border-color:var(--border-color)}.curriculum-overview-item.current{background:#3b82f614;border-color:var(--accent-blue)}.curriculum-overview-item.completed .co-number{background:var(--accent-green);color:#fff}.co-number{width:22px;height:22px;border-radius:50%;background:var(--border-color);color:var(--text-secondary);display:flex;align-items:center;justify-content:center;font-size:.7rem;font-weight:600;flex-shrink:0;margin-top:1px}.co-details{flex:1;min-width:0}.co-title-row{display:flex;align-items:center;gap:6px;margin-bottom:2px}.co-title{font-size:.8rem;font-weight:600;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.co-objective{font-size:.72rem;color:var(--text-muted);line-height:1.3;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.co-status{font-size:.65rem;font-weight:500;padding:2px 6px;border-radius:8px;flex-shrink:0;margin-top:2px}.co-status.completed{background:#22c55e26;color:var(--accent-green)}.co-status.current{background:#3b82f626;color:var(--accent-blue)}.co-status.locked{background:#94a3b81a;color:var(--text-muted)}.curriculum-overview-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:999}