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var(--border-color);font-size:16px;width:100%;max-width:var(--auth-max-width)}.btn-secondary:hover{background-color:var(--border-color);border-color:var(--border-color)}.btn-secondary:active{transform:scale(.97);opacity:.92}.btn-icon{width:48px;height:48px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:var(--text-secondary);transition:all .2s ease;background:var(--bg-secondary);border:1px solid var(--border-color)}.btn-icon:hover{background:var(--border-color);color:var(--text-primary)}.sidebar{width:280px;height:calc(100vh - 80px);background:var(--bg-secondary);display:flex;flex-direction:column;transition:transform .3s ease,width .2s ease;z-index:20;border-right:1px solid var(--border-color);overflow:hidden}.sidebar.collapsed{width:72px}.sidebar.collapsed .sidebar-nav{padding:1.5rem 0;align-items:center}.sidebar.collapsed .nav-item{width:48px;height:48px;max-width:48px;padding:0;gap:0;justify-content:center;border-radius:50%;background:var(--bg-secondary);border:none}.sidebar.collapsed .nav-item.active{background:var(--accent-glow);color:var(--accent-color)}.library-resize-bar{background:var(--border-color);transition:background .15s ease}.library-resize-handle:hover .library-resize-bar,.library-resize-handle:active .library-resize-bar{background:var(--text-secondary)}.lib-tree{scrollbar-width:none;-ms-overflow-style:none}.lib-tree::-webkit-scrollbar{width:0;height:0;display:none}.lib-tree-track{height:48px;box-sizing:border-box}.lib-tree-track--gap{height:56px;padding-top:8px}.lib-tree-surface{display:flex;align-items:center;gap:.4rem;height:48px;margin:0 8px;padding-right:14px;background:var(--bg-secondary);color:var(--text-primary);border-left:1px solid var(--separator, var(--border-color));border-right:1px solid var(--separator, var(--border-color));cursor:pointer;white-space:nowrap;box-sizing:border-box;transition:background .12s ease,color .12s ease;-webkit-user-select:none;user-select:none;font-size:14px;font-weight:400;letter-spacing:-.006em}.lib-tree-surface--top{border-top:1px solid var(--separator, var(--border-color));border-radius:36px 36px 0 0;box-shadow:inset 0 1px 0 0 var(--tree-card-highlight)}.lib-tree-surface--bottom{border-bottom:1px solid var(--separator, var(--border-color));border-radius:0 0 36px 36px;box-shadow:var(--tree-card-shadow)}.lib-tree-surface--top.lib-tree-surface--bottom{border-radius:36px;box-shadow:inset 0 1px 0 0 var(--tree-card-highlight),var(--tree-card-shadow)}.lib-tree-surface:hover{background:var(--fill-2, var(--bg-secondary))}.lib-tree-surface:focus-visible{outline:2px solid var(--accent-color);outline-offset:-2px}.lib-tree-surface--source{font-size:15px;font-weight:700;letter-spacing:-.01em}.lib-tree-surface--source .lib-tree-label{line-height:1}.lib-tree-surface--source:hover{background:var(--bg-secondary)}.lib-tree-surface--category{font-weight:600}.lib-tree-surface--regulation .lib-tree-label{font-weight:500}.lib-tree-surface--selected,.lib-tree-surface--selected:hover{background:var(--accent-glow);color:var(--accent-color);font-weight:500}.lib-tree-chevron{flex-shrink:0;width:16px;color:var(--text-tertiary, var(--text-secondary));display:inline-flex;align-items:center;justify-content:center;transition:transform .16s var(--ease-out),color .12s ease}.lib-tree-chevron--open{transform:rotate(90deg)}.lib-tree-surface:hover .lib-tree-chevron,.lib-tree-surface--selected .lib-tree-chevron{color:inherit}.lib-tree-label{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;min-width:0;flex:0 1 auto}.lib-tree-logo{height:20px;width:auto;max-width:64px;object-fit:contain;flex-shrink:0;margin-left:8px;align-self:center;display:block}.lib-tree-ref{flex-shrink:0;margin-left:auto;padding-left:12px;color:var(--text-tertiary, var(--text-secondary));font-size:12px;font-weight:500;letter-spacing:-.006em}.lib-tree-surface--selected .lib-tree-ref{color:var(--accent-color)}.lib-tree-row--placeholder{cursor:default;opacity:.45;font-style:italic;background:var(--bg-secondary)}.lib-tree-rowwrap{transition:transform .24s var(--ease-out)}.lib-tree-canvas{transition:height .24s var(--ease-out)}@media(prefers-reduced-motion:reduce){.lib-tree-chevron{transition:none}.lib-tree-surface--source{animation:none!important}.lib-tree-rowwrap,.lib-tree-canvas{transition:none}}.header-hamburger{display:none;align-items:center;justify-content:center;width:40px;height:40px;border-radius:10px;background:transparent;border:none;color:var(--text-primary);cursor:pointer;flex-shrink:0;transition:transform .16s var(--ease-out),background .12s ease}.header-hamburger:hover{background:var(--fill-2, var(--bg-secondary))}.header-hamburger:active{transform:scale(.94)}.sidebar-backdrop{position:fixed;inset:0;background:#00000073;z-index:var(--z-drawer-backdrop);animation:fadeIn .2s ease-out}@media(max-width:900px){.header-hamburger{display:inline-flex}.sidebar{position:fixed;top:0;left:0;height:100vh;width:280px;z-index:var(--z-drawer);transform:translate(-100%);transition:transform .26s var(--ease-drawer);box-shadow:var(--shadow-2, 0 4px 24px rgba(0,0,0,.25));border-right:1px solid var(--border-color)}.sidebar.collapsed{width:280px}.sidebar.collapsed .sidebar-nav{padding:1.5rem 1rem;align-items:stretch}.sidebar.mobile-open{transform:translate(0)}.main-content{margin-left:0}}@media(max-width:900px)and (prefers-reduced-motion:reduce){.sidebar{transition:none}.sidebar-backdrop{animation:none}}.sidebar-footer{height:80px;padding:1rem 1.5rem;display:flex;flex-direction:column;justify-content:center;gap:.75rem;background:var(--bg-color);border-top:1px solid var(--border-color);border-right:none}.sidebar-header{height:80px;display:flex;align-items:center;padding:0 2rem;border-bottom:1px solid var(--border-color);font-weight:700;font-size:20px;letter-spacing:-.02em;color:var(--text-primary)}.sidebar-brand-accent{color:var(--accent-color)}.brand-logo{height:32px;content:url(/Logo_black.png)}[data-theme=dark] .brand-logo{content:url(/Logo_white.png)}.sidebar-nav{flex:1;padding:1.5rem 1rem;overflow-y:hidden;display:flex;flex-direction:column;gap:.5rem;max-height:calc(100vh - 160px)}.nav-item{display:flex;align-items:center;gap:1rem;padding:0 1.5rem;height:var(--auth-input-height);max-width:calc(var(--auth-max-width) * 2 / 3);border-radius:var(--radius-pill);color:var(--text-secondary);font-size:16px;font-weight:400;transition:none;text-decoration:none}.nav-item.active{background-color:var(--accent-glow);color:var(--accent-color);text-decoration:none}.nav-item:hover{text-decoration:none}.workspace-section{margin-top:2rem}.workspace-title{color:var(--text-secondary);margin-bottom:.5rem;padding:0 1rem}.pin-item-legacy-removed:hover{background-color:var(--border-color);color:var(--text-primary)}.login-container{min-height:100vh;display:flex;flex-direction:column;background:radial-gradient(circle at 10% 20%,var(--accent-glow) 0%,transparent 40%),radial-gradient(circle at 90% 80%,var(--secondary-glow) 0%,transparent 40%);background-color:var(--bg-color)}.login-content{flex:1;display:flex;align-items:center;justify-content:center;padding:2rem;width:100%}.login-form-wrapper{width:100%;max-width:420px;display:flex;flex-direction:column}.login-card{width:100%;max-width:420px;padding:2.5rem}.login-title{font-size:28px;margin-bottom:.5rem;text-align:center}.login-subtitle{color:var(--text-secondary);text-align:center;margin-bottom:2rem;font-size:16px}.form-group{margin-bottom:1.5rem}.form-label{display:block;font-size:14px;font-weight:500;margin-bottom:.5rem;color:var(--text-secondary)}.form-input{width:100%;max-width:var(--auth-max-width);height:var(--auth-input-height);padding:0 1.5rem;border-radius:var(--radius-pill);border:1px solid var(--border-color);background:var(--bg-secondary);color:var(--text-primary);font-size:16px;font-weight:400;transition:all .2s ease;outline:none}.form-input:focus{border-color:var(--accent-color);box-shadow:0 0 0 4px color-mix(in srgb,var(--accent-color) 14%,transparent)}.form-textarea{width:100%;max-width:var(--auth-max-width);min-height:calc(var(--auth-input-height) * 2);padding:.875rem 1.5rem;border-radius:var(--radius-md);border:1px solid var(--border-color);background:var(--bg-secondary);color:var(--text-primary);font-size:16px;font-weight:400;line-height:1.5;transition:all .2s ease;outline:none;resize:vertical}.form-textarea:focus{border-color:var(--accent-color);box-shadow:0 0 0 3px var(--accent-glow)}[data-theme=light] .form-textarea{background:#fff}.search-wrap{position:relative;width:100%;max-width:var(--auth-max-width)}.search-input{width:100%;height:var(--auth-input-height);background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-pill);padding:0 1.5rem 0 3rem;font-size:16px;font-weight:400;color:var(--text-primary);outline:none;transition:all .2s ease}.search-input:focus{border-color:var(--accent-color);box-shadow:0 0 0 3px var(--accent-glow)}[data-theme=light] .search-input{background:#fff}.search-wrap>.search-icon-leading{position:absolute;left:1rem;top:50%;transform:translateY(-50%);width:18px;height:18px;color:var(--text-secondary);pointer-events:none}.form-select{width:100%;max-width:var(--auth-max-width);height:var(--auth-input-height);background:var(--bg-secondary) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2352525b' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E") no-repeat right 1.25rem center;border:1px solid var(--border-color);border-radius:var(--radius-pill);padding:0 2.5rem 0 1.5rem;font-size:16px;font-weight:400;color:var(--text-primary);appearance:none;-webkit-appearance:none;-moz-appearance:none;cursor:pointer;outline:none;transition:all .2s ease}.form-select:focus{border-color:var(--accent-color);box-shadow:0 0 0 3px var(--accent-glow)}[data-theme=light] .form-select{background-color:#fff}[data-theme=light] .form-input,[data-theme=light] input.form-input,[data-theme=light] select.form-input,[data-theme=light] textarea.form-input{background:#fff}.btn-pill{display:inline-flex;align-items:center;justify-content:center;gap:.75rem;padding:.6rem 1.25rem;border-radius:var(--radius-pill);background:var(--bg-secondary);border:1px solid var(--border-color);color:var(--text-primary);font-weight:600;font-size:14px;transition:all .2s cubic-bezier(.4,0,.2,1);cursor:pointer;white-space:nowrap}.btn-pill:hover{background:var(--accent-glow);border-color:var(--accent-color);transform:translateY(-1px)}.btn-pill svg{color:var(--text-secondary);transition:color .2s ease}.btn-pill:hover svg{color:var(--accent-color)}.modal-overlay{position:fixed;inset:0;background:#0009;backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);display:flex;align-items:center;justify-content:center;z-index:var(--z-modal);animation:fadeIn .2s ease-out}.modal-content{background:var(--bg-secondary);padding:2.5rem 2rem;border-radius:var(--radius-xl);width:480px;max-width:95%;box-shadow:0 4px 12px #0000001a;border:1px solid var(--border-color);animation:scaleIn .3s cubic-bezier(.34,1.56,.64,1);position:relative;display:flex;flex-direction:column;align-items:center}[data-theme=light] .modal-content{background:#fff;box-shadow:0 30px 60px #0000001a}.modal-title{font-size:20px;font-weight:600;color:var(--text-primary);margin-bottom:1.5rem;letter-spacing:-.012em;text-align:center}.folder-selection-list{width:100%;max-width:400px;display:flex;flex-direction:column;align-items:center;gap:.75rem;margin-bottom:1rem;padding:.2rem}.folder-selection-btn{width:400px!important;height:44px;padding:0 1.25rem;display:flex;align-items:center;gap:1rem;background:var(--bg-color);border:1px solid var(--border-color);border-radius:var(--radius-pill);color:var(--text-primary);font-size:14px;font-weight:600;cursor:pointer;transition:all .2s cubic-bezier(.4,0,.2,1);text-align:left}.folder-selection-btn:hover{background:var(--text-primary)!important;color:var(--text-on-accent)!important;border-color:var(--text-primary)}.folder-selection-btn:hover svg{color:var(--text-on-accent);opacity:1}.folder-selection-btn svg{color:var(--accent-color);width:18px;height:18px;opacity:.8;transition:all .2s ease}.btn-create-folder{width:100%;max-width:var(--auth-max-width);height:var(--auth-input-height);display:flex;align-items:center;justify-content:center;gap:.75rem;background:var(--accent-color);color:var(--text-on-accent);border:1px solid var(--border-color);border-radius:var(--radius-pill);font-weight:600;font-size:16px;cursor:pointer;transition:all .24s cubic-bezier(.4,0,.2,1);margin:0}.modal-actions{width:100%;display:flex;flex-direction:column;align-items:center;gap:.75rem}.modal-cancel-btn{width:400px!important;height:44px;background:transparent;border:1px solid var(--border-color);border-radius:var(--radius-pill);color:var(--text-secondary);font-weight:600;font-size:14px;cursor:pointer;transition:all .2s ease}.modal-cancel-btn:hover{background:var(--bg-secondary);color:var(--text-primary)}.ctx-menu{background:rgba(var(--bg-secondary-rgb),.55);backdrop-filter:blur(40px) saturate(180%);-webkit-backdrop-filter:blur(40px) saturate(180%);border:1px solid var(--border-color);border-radius:16px;padding:8px;box-shadow:0 10px 30px #0000000f,inset 0 1px #ffffff59;display:flex;flex-direction:column;gap:4px}[data-theme=dark] .ctx-menu{background:rgba(var(--bg-secondary-rgb),.42);border:1px solid var(--border-color);box-shadow:0 10px 30px #00000059,inset 0 1px #ffffff0f}.ctx-btn{background:transparent;border:none;display:flex;align-items:center;gap:12px;width:100%;padding:10px 12px;border-radius:8px;color:var(--text-primary);transition:all .2s ease;cursor:pointer;text-align:left}.ctx-btn:hover{background-color:var(--accent-glow)!important}.pin-item{transition:all .2s ease;padding:0 14px;min-height:44px;border-radius:var(--radius-xs);cursor:pointer;margin:2px 0;display:flex;align-items:center;gap:8px}.pin-item:hover{background-color:var(--bg-secondary)}[data-theme=dark] .pin-item:hover{background-color:#ffffff0d}input::-webkit-outer-spin-button,input::-webkit-inner-spin-button{-webkit-appearance:none;appearance:none;margin:0}input[type=number]{-moz-appearance:textfield;appearance:textfield}.login-btn{width:100%;margin-top:1rem}.chat-container{flex:1;display:flex;flex-direction:column;overflow:hidden;background-color:var(--bg-color);width:100%}.chat-messages{flex:1;overflow-y:auto;padding:2rem;display:flex;flex-direction:column;gap:1.5rem}.message{max-width:80%;padding:1rem 1.25rem;border-radius:16px;line-height:1.5;font-size:16px;animation:fadeIn .3s ease}.message.user{align-self:flex-end;background-color:var(--accent-color);color:#fff;border-bottom-right-radius:4px}[data-theme=dark] .message.user{color:#000}.message.ai{align-self:flex-start;background-color:var(--bg-secondary);border:1px solid var(--border-color);border-bottom-left-radius:4px}.message-source{margin-top:.75rem;padding-top:.75rem;border-top:1px solid var(--border-color);font-size:12px;color:var(--text-secondary);display:flex;align-items:center;gap:.5rem}.source-tag{background-color:var(--accent-glow);color:var(--accent-color);padding:.15rem .5rem;border-radius:4px;font-weight:600;font-size:12px}.chat-input-area{padding:1.5rem 0;background:var(--bg-color);border-top:1px solid var(--border-color);height:135px;display:flex;flex-direction:column;justify-content:center}.chat-input-box{display:flex;align-items:center;background:var(--bg-color);border:1px solid var(--border-color);border-radius:var(--radius-pill);padding:.5rem .5rem .5rem 1.5rem;transition:all .2s ease;margin:0 2rem;margin-right:calc(2rem + 17px)}.chat-textarea{flex:1;border:none;background:transparent;padding:.5rem 0;resize:none;max-height:120px;color:var(--text-primary);font-size:16px}.chat-send-btn{background-color:var(--accent-color);color:#fff;width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;margin-left:.5rem;transition:transform .2s}[data-theme=dark] .chat-send-btn{color:#000}.chat-send-btn:hover{transform:scale(1.05)}.chat-footer-text{text-align:center;font-size:12px;color:var(--text-secondary);margin-top:.5rem;padding:0 2rem;opacity:.8}.quiz-container{max-width:960px;margin:0 auto;padding:2.5rem;width:100%}.quiz-header{margin-bottom:2rem;display:flex;justify-content:space-between;align-items:center}.quiz-card{padding:2rem;margin-bottom:2rem}.quiz-question{font-size:20px;font-weight:600;margin-bottom:1.5rem;color:var(--text-primary)}.quiz-options{display:flex;flex-direction:column;gap:1rem}.quiz-option{padding:1rem 1.5rem;border-radius:var(--radius-md);background:var(--bg-color);display:flex;align-items:center;gap:1rem;cursor:pointer;transition:all .2s ease;font-size:16px}.quiz-option:hover,.quiz-option.selected{border-color:var(--accent-color);background:var(--accent-glow)}.quiz-option.correct{border-color:var(--success-color);background:rgba(var(--success-color-rgb),.1)}.quiz-option.incorrect{border-color:var(--danger-color);background:rgba(var(--danger-color-rgb),.1)}.option-letter{background:var(--bg-secondary);border:1px solid var(--border-color);width:28px;height:28px;border-radius:6px;display:flex;align-items:center;justify-content:center;font-weight:600;font-size:14px;color:var(--text-secondary)}.quiz-explanation{margin-top:1.5rem;padding:1.5rem;background:var(--bg-color);border-left:4px solid var(--accent-color);border-radius:8px;animation:fadeIn .4s ease}.settings-container{max-width:1600px;margin:0 auto;padding:2.5rem;width:100%}.settings-card{padding:2rem;margin-bottom:1.5rem}.settings-row{display:flex;justify-content:space-between;align-items:center;padding:1rem 0;border-bottom:1px solid var(--border-color)}.settings-row:last-child{border-bottom:none}.settings-info h3{font-size:16px;margin-bottom:.25rem}.settings-info p{color:var(--text-secondary);font-size:14px}.toggle-switch{position:relative;display:inline-block;width:50px;height:24px}.toggle-switch input{opacity:0;width:0;height:0}.slider{position:absolute;cursor:pointer;inset:0;background-color:var(--fill);transition:background-color .3s cubic-bezier(.22,1,.36,1);border-radius:24px}.slider:before{position:absolute;content:"";height:18px;width:18px;left:3px;bottom:3px;background-color:#fff;box-shadow:0 2px 4px #00000040;transition:transform .3s 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