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var(--ease)}@media(hover:hover){.glass-card-hover:hover{transform:translateY(-2px);box-shadow:var(--shadow-2)}}#root{min-height:100vh;display:flex;flex-direction:column}a{color:var(--accent-color);text-decoration:none;transition:color .2s ease}a:hover{text-decoration:underline}button{cursor:pointer;border:none;background:none;outline:none}input,textarea{outline:none}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--bg-color)}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--text-secondary)}.app-container{display:flex;height:calc(100vh - 80px);overflow:hidden}.main-content{flex:1;display:flex;flex-direction:column;height:calc(100vh - 80px);position:relative;overflow:hidden}.header{height:80px;background:var(--glass-bg);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border-color);display:flex;align-items:center;justify-content:space-between;padding:0 2rem;z-index:10}.login-container.auth-no-header-border .header{border-bottom:none}.deep-search-bar{flex:1;max-width:600px;margin:0 2rem;position:relative}.deep-search-input{border-radius:var(--radius-pill);padding:1rem 1.5rem 1rem 3rem;border:1px solid var(--border-color);background:var(--bg-secondary);color:var(--text-primary);font-size:16px;transition:all .2s ease}.deep-search-input:focus{border-color:var(--accent-color);box-shadow:0 0 0 3px var(--accent-glow)}.search-icon{position:absolute;left:.8rem;top:50%;transform:translateY(-50%);color:var(--text-secondary)}h1,h2,h3,h4,h5,h6{color:var(--text-primary);font-weight:600}.auth-title{font-size:32px;font-weight:700;margin:0 0 .5rem;letter-spacing:-.02em;color:var(--text-primary)}.auth-error-text{color:var(--danger-color);font-size:14px;text-align:center}.btn-primary{background-color:var(--accent-color);color:var(--text-on-accent);border:1px solid var(--border-color);padding:0 2rem;height:var(--auth-input-height);border-radius:var(--radius-pill);font-weight:500;transition:all .24s cubic-bezier(.4,0,.2,1);display:inline-flex;align-items:center;justify-content:center;gap:.75rem;font-size:16px;width:100%;max-width:var(--auth-max-width);opacity:1}.btn-primary:hover{background-color:var(--accent-hover);opacity:.88}.btn-primary:active{transform:scale(.97);opacity:.92}.btn-three-quarters{max-width:calc(var(--auth-max-width) * 3 / 4)}.btn-two-thirds{max-width:calc(var(--auth-max-width) * 2 / 3)}.btn-half{max-width:calc(var(--auth-max-width) / 2)}.btn-third{max-width:calc(var(--auth-max-width) / 3)}.btn-quarter{max-width:calc(var(--auth-max-width) / 4)}.btn-primary.btn-danger{background-color:var(--danger-color);color:#fff;border-color:var(--danger-color)}.btn-primary.btn-danger:hover{background-color:var(--danger-hover);border-color:var(--danger-hover);color:#fff}.segmented-control-wrapper{position:relative;width:100%;height:var(--auth-input-height);background:var(--glass-surface-bg);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);border:1px solid var(--border-color);border-radius:var(--radius-pill);padding:.4rem;display:flex;gap:.25rem;box-sizing:border-box;box-shadow:inset 0 1px 2px #0000001a,inset 0 -1px #ffffff1f,0 1px 1px #ffffff4d}[data-theme=dark] .segmented-control-wrapper{box-shadow:inset 0 1px 3px #00000073,inset 0 -1px #ffffff0a}.segmented-item{flex:1;display:flex}.segmented-indicator{position:absolute;top:.4rem;bottom:.4rem;left:.4rem;width:calc(50% - .5rem);background:linear-gradient(180deg,var(--accent-color),color-mix(in srgb,var(--accent-color) 86%,#000));border-radius:var(--radius-pill);transition:transform .3s cubic-bezier(.4,0,.2,1);box-shadow:inset 0 1.5px #fff9,inset 0 -2px 3px #00000038,0 2px 5px #00000080,0 6px 16px #00000073;z-index:1}.segmented-btn{width:100%;padding:0 1.5rem;border-radius:var(--radius-pill);font-size:14px;font-weight:600;color:var(--text-secondary);transition:all .2s cubic-bezier(.4,0,.2,1);display:flex;align-items:center;justify-content:center;gap:8px;background:transparent;border:none;white-space:nowrap;position:relative;z-index:1;cursor:pointer}.segmented-btn.active{color:var(--text-on-accent)}.login-mode-toggle{width:100%;max-width:var(--auth-max-width);height:48px;box-sizing:border-box;margin:0 auto .75rem;background:var(--glass-surface-bg);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);border:1px solid var(--border-color);padding:.4rem;border-radius:999px;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:.25rem;position:relative;isolation:isolate;box-shadow:inset 0 1px 2px #0000001a,inset 0 -1px #ffffff1f,0 1px 1px #ffffff4d}.login-mode-toggle:before{content:"";position:absolute;top:.4rem;left:.4rem;width:calc((100% - 1.3rem) / 3);height:calc(100% - .8rem);border-radius:999px;background:linear-gradient(180deg,var(--accent-color),color-mix(in srgb,var(--accent-color) 86%,#000));box-shadow:inset 0 1.5px #fff9,inset 0 -2px 3px #00000038,0 2px 5px #00000080,0 6px 16px #00000073;transform:translate(0);transition:transform .35s cubic-bezier(.22,1,.36,1);z-index:0}.login-mode-toggle.pos-2:before{transform:translate(calc(100% + .25rem))}.login-mode-toggle.pos-3:before{transform:translate(calc(200% + .5rem))}.login-mode-toggle button{padding:.6rem 1.5rem;border-radius:999px;font-size:14px;font-weight:600;transition:color .2s cubic-bezier(.4,0,.2,1);color:var(--text-secondary);white-space:nowrap;background:transparent;position:relative;z-index:1;display:inline-flex;align-items:center;justify-content:center;text-align:center;line-height:1;width:100%;border:none;cursor:pointer}.login-mode-toggle button.active{color:var(--text-on-accent)}[data-theme=dark] .login-mode-toggle{box-shadow:inset 0 1px 3px #00000073,inset 0 -1px #ffffff0a}.btn-secondary{background-color:var(--bg-secondary);color:var(--text-primary);padding:0 2rem;height:var(--auth-input-height);border-radius:var(--radius-pill);font-weight:500;transition:all .24s cubic-bezier(.4,0,.2,1);display:inline-flex;align-items:center;justify-content:center;gap:.75rem;border:1px solid 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 var(--ease-drawer),width .26s var(--ease-drawer);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:#b4b4ba;transition:background .15s ease,transform .15s ease}[data-theme=dark] .library-resize-bar{background:#5a5a62}.library-resize-handle:hover .library-resize-bar,.library-resize-handle:active .library-resize-bar{background:#8a8a90;transform:scaleX(1.5)}[data-theme=dark] .library-resize-handle:hover .library-resize-bar,[data-theme=dark] .library-resize-handle:active .library-resize-bar{background:#8a8a90}.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 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.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)}@keyframes libCardIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.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,.sidebar{transition:none}.pdf-viewer-container{transition:none!important}.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)}.header-hamburger:active{transform:scale(.94)}@media(max-width:900px){.header-hamburger{display:inline-flex}}.sidebar-backdrop{position:fixed;inset:0;background:#00000073;z-index:var(--z-drawer-backdrop);animation:fadeIn .2s ease-out}@media(max-width:900px){.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);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}.sidebar-nav svg,.nav-item svg,.pin-item svg{flex-shrink:0}.workspace-section{margin-top:0}.workspace-section+.workspace-section{margin-top:2rem}.sidebar-workspace-scroll{scrollbar-width:thin;scrollbar-color:var(--border-color) transparent}.sidebar-workspace-scroll::-webkit-scrollbar{width:6px}.sidebar-workspace-scroll::-webkit-scrollbar-track{background:transparent}.sidebar-workspace-scroll::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:999px}.sidebar-workspace-scroll::-webkit-scrollbar-thumb:hover{background:var(--text-secondary)}.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:100%;max-width:var(--auth-max-width);height:var(--auth-input-height);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:100%;max-width:var(--auth-max-width);height:var(--auth-input-height);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)}.dialog-icon{width:60px;height:60px;border-radius:999px;display:flex;align-items:center;justify-content:center;margin-bottom:1.1rem;flex-shrink:0}.dialog-icon--success{color:var(--success-color);background:rgba(var(--success-color-rgb),.12)}.dialog-icon--danger{color:var(--danger-color);background:rgba(var(--danger-color-rgb),.12)}.dialog-icon--info{color:var(--accent-color);background:rgba(var(--accent-color-rgb, 59, 130, 246),.12)}.dialog-message{font-size:15px;line-height:1.55;color:var(--text-secondary);text-align:center;margin:0 0 1.5rem;max-width:var(--auth-max-width);white-space:pre-wrap}.modal-close-x{position:absolute;top:1rem;right:1rem;width:32px;height:32px;border-radius:999px;border:none;background:transparent;color:var(--text-secondary);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .18s ease}.modal-close-x:hover{background:var(--bg-color);color:var(--text-primary)}.rewards-pair>*{height:100%}.rewards-pair>*>*{height:100%;box-sizing:border-box}.modal-content{box-shadow:inset 0 1.5px #ffffff80,0 1px 3px #0000001f,0 24px 60px #00000038!important}[data-theme=dark] .modal-content{box-shadow:inset 0 1.5px #ffffff14,0 1px 3px #00000080,0 24px 60px #0009!important}.dialog-icon{box-shadow:inset 0 1.5px #ffffff8c,inset 0 -2px 4px #0000001a,0 3px 8px #0000001f}[data-theme=dark] .dialog-icon{box-shadow:inset 0 1.5px #ffffff1a,inset 0 -2px 4px #0000004d,0 3px 8px #00000073}.modal-content .folder-selection-list{width:100%;max-width:var(--auth-max-width);padding:0}.modal-content .btn-primary,.modal-content .btn-secondary,.modal-content .modal-cancel-btn,.modal-content .folder-selection-btn,.modal-content .btn-create-folder{width:100%;max-width:var(--auth-max-width);font-size:15px!important;font-weight:600!important;box-sizing:border-box}.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:var(--radius-lg);padding:5px;box-shadow:0 10px 30px #0000000f,inset 0 1px #ffffff59;display:flex;flex-direction:column;gap:2px}[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:8px;width:100%;padding:6px 9px;border-radius:var(--radius-xs);color:var(--text-primary);transition:all .2s ease;cursor:pointer;text-align:left;font-size:13px}.ctx-btn svg{width:14px;height:14px}.ctx-btn:hover{background-color:var(--accent-glow)!important}.item-ctx-trigger{opacity:0;background:none;border:none;cursor:pointer;color:var(--text-secondary);padding:4px;display:flex;align-items:center;border-radius:6px;flex-shrink:0;transition:opacity .15s,background .15s}.pin-item:hover .item-ctx-trigger{opacity:1}.item-ctx-trigger:hover{background:transparent}.pin-item{transition:all .2s ease;padding:0 4px;min-height:32px;border-radius:var(--radius-xs);cursor:pointer;margin:0;display:flex;align-items:center;gap:8px}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);display:flex;flex-direction:column;justify-content:flex-end}.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 cubic-bezier(.34,1.56,.64,1);border-radius:50%}input:checked+.slider{background-color:var(--accent-color)}input:checked+.slider:before{transform:translate(26px)}.toggle-group{display:flex;background:var(--bg-color);border:1px solid var(--border-color);border-radius:16px;overflow:hidden}.toggle-btn{padding:.5rem 1rem;font-size:14px;font-weight:500;background:transparent;color:var(--text-secondary);transition:all .2s ease}.toggle-btn.active{background:var(--accent-color);color:#fff}[data-theme=dark] .toggle-btn.active{color:#000}.disclaimer-box{background:rgba(var(--danger-color-rgb),.05);border:1px solid rgba(var(--danger-color-rgb),.2);padding:1rem;border-radius:8px;color:var(--danger-color);font-size:14px;line-height:1.6}@media(hover:hover){.reward-tile-hover:hover{transform:translateY(-3px);box-shadow:0 6px 20px color-mix(in srgb,var(--miles-color, #c19a6b) 18%,transparent)}}@keyframes flameFlicker{0%,to{transform:scale(1) rotate(-2deg);opacity:1}50%{transform:scale(1.14) rotate(2deg);opacity:.82}}.streak-flame{transform-origin:center bottom;animation:flameFlicker 1.3s ease-in-out infinite}@media(prefers-reduced-motion:reduce){.streak-flame{animation:none}}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes glowPulse{0%{box-shadow:0 0 5px var(--accent-glow)}50%{box-shadow:0 0 20px var(--accent-glow)}to{box-shadow:0 0 5px var(--accent-glow)}}.landing-container{display:flex;flex-direction:column;min-height:100vh;background-color:var(--bg-color)}.landing-header{display:flex;justify-content:space-between;align-items:center;padding:1.5rem 2rem;border-bottom:1px solid var(--border-color);background:var(--glass-bg);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);position:sticky;top:0;z-index:100}.landing-brand{display:flex;align-items:center;color:var(--text-primary)}.landing-nav{display:flex;align-items:center;gap:2rem}.landing-nav a{color:var(--text-secondary);font-weight:500;text-decoration:none;transition:color .2s ease}.landing-nav a:hover{color:var(--text-primary)}.hero-section{padding:6rem 2rem;text-align:center;position:relative;display:flex;justify-content:center;overflow:hidden;z-index:1}.hero-section:after{content:"";position:absolute;inset:0;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%);z-index:-2;pointer-events:none}.hero-content{max-width:800px;position:relative;z-index:10}.badge{display:inline-block;background:var(--accent-glow);color:var(--accent-color);padding:.3rem .75rem;border-radius:var(--radius-xs);font-weight:600;font-size:14px;margin-bottom:1.5rem}.hero-title{font-size:3.5rem;line-height:1.1;margin-bottom:1.5rem;letter-spacing:-.02em}.hero-subtitle{font-size:20px;color:var(--text-secondary);margin-bottom:2.5rem;line-height:1.6}.hero-actions{display:flex;gap:1rem;justify-content:center}.section-title{font-size:32px;text-align:center;margin-bottom:3rem}.features-section{padding:5rem 2rem;background:var(--bg-secondary);border-top:1px solid var(--border-color);border-bottom:1px solid var(--border-color)}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:2rem;max-width:1200px;margin:0 auto}.feature-card{padding:2.5rem}.feature-card h3{font-size:20px;margin-bottom:.5rem}.feature-card p{color:var(--text-secondary);font-size:16px}.pricing-section{padding:5rem 2rem}.pricing-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:2rem;max-width:1000px;margin:0 auto}.pricing-card{padding:2.5rem;position:relative;display:flex;flex-direction:column;background:var(--glass-bg);-webkit-backdrop-filter:var(--glass-blur) saturate(1.4);backdrop-filter:var(--glass-blur) saturate(1.4);border:var(--glass-border);border-radius:var(--radius-lg);box-shadow:var(--glass-surface-shadow)}.pkg-step{display:flex;flex-direction:column;align-items:center;min-height:var(--auth-step-body);width:min(1400px,100vw - 48px);margin-left:calc((var(--auth-max-width) - min(1400px,100vw - 48px)) / 2)}.pkg-grid-area{flex:1;display:flex;align-items:center;width:100%;min-height:0}.pkg-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--space-4, 1rem);width:100%;margin:0 auto;align-items:center}.pkg-grid:not(:has(.pkg-tile.is-open)){align-items:stretch}.pkg-upsell{text-align:center;margin-bottom:1.25rem}.pkg-step-footer{display:flex;flex-direction:column;gap:.75rem;align-items:center;width:100%;max-width:var(--auth-max-width)}.pkg-tile{min-width:0;color:var(--text-primary);overflow:hidden;display:flex;flex-direction:column;padding:20px 24px;cursor:pointer;text-align:left;font:inherit}.pkg-tile:active{transform:scale(.985)}.pkg-tile-head{display:flex;align-items:center;gap:.6rem;min-width:0;margin-bottom:.5rem}.pkg-tile-name{min-width:0}.pkg-tile-icon{flex-shrink:0;color:var(--text-primary)}.pkg-tile-pitch-wrap,.pkg-tile-detail-wrap{display:grid;transition:grid-template-rows .34s var(--ease-in-out)}.pkg-tile.is-open .pkg-tile-pitch-wrap,.pkg-tile.is-open .pkg-tile-detail-wrap{transition:grid-template-rows .44s var(--ease-out)}.pkg-tile-pitch-wrap{grid-template-rows:1fr}.pkg-tile-detail-wrap,.pkg-tile.is-open .pkg-tile-pitch-wrap{grid-template-rows:0fr}.pkg-tile.is-open .pkg-tile-detail-wrap{grid-template-rows:1fr}.pkg-tile-pitch,.pkg-tile-detail{overflow:hidden;min-width:0}.pkg-tile-pitch{opacity:1;transition:opacity .3s var(--ease-in-out) .1s}.pkg-tile-detail{opacity:0;transition:opacity .2s var(--ease-in-out)}.pkg-tile.is-open .pkg-tile-pitch{opacity:0;transition:opacity .2s var(--ease-out)}.pkg-tile.is-open .pkg-tile-detail{opacity:1;transition:opacity .3s var(--ease-out) .1s}.pkg-tagline{margin:.75rem 0 .35rem}.pkg-blurb{margin:0}.pkg-paths{margin:0 0 .35rem}.pkg-stats{display:flex;flex-wrap:wrap;gap:.05rem .6rem;margin-bottom:.4rem}.pkg-modules-head{border-top:1px solid var(--border-color);padding-top:.4rem;margin-bottom:.35rem}.pkg-modules{display:block;color:var(--text-secondary)}.pkg-modules>span:after{content:" · ";opacity:.45}.pkg-modules>span:last-child:after{content:""}@media(prefers-reduced-motion:reduce){.pkg-tile-pitch,.pkg-tile-detail,.pkg-tile.is-open .pkg-tile-pitch,.pkg-tile.is-open .pkg-tile-detail{transition-duration:1ms;transition-delay:0ms;transform:none}.pkg-tile:active{transform:none}}@media(max-width:768px){.pkg-step{min-height:0}.pkg-grid{grid-template-columns:1fr}.pkg-tile-head{align-items:flex-start}.pkg-tile-icon{margin-top:.35rem}}.popular-badge{position:absolute;top:-12px;left:50%;transform:translate(-50%);background:var(--accent);color:var(--accent-contrast);border-radius:var(--radius-xs);padding:3px 10px;font-size:12px;font-weight:600}[data-theme=dark] .popular-badge{color:var(--accent-contrast)}.price{font-size:3rem;font-weight:700;margin:1.5rem 0;color:var(--text-primary)}.price span{font-size:16px;color:var(--text-secondary);font-weight:400}.pricing-features{list-style:none;margin-bottom:2.5rem;flex:1}.pricing-features li{display:flex;align-items:center;gap:.75rem;margin-bottom:1rem;font-size:16px;color:var(--text-secondary)}.billing-toggle-container{display:flex;justify-content:center;align-items:center}.billing-toggle{width:100%;max-width:420px;margin:0 auto;height:48px;box-sizing:border-box;background:rgba(var(--bg-secondary-rgb),.38);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);border:1px solid var(--border-color);padding:.4rem;border-radius:999px;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:.25rem;position:relative;isolation:isolate;box-shadow:inset 0 1px 2px #0000001a,inset 0 -1px #ffffff1f,0 1px 1px #ffffff4d}.billing-toggle:before{content:"";position:absolute;top:.4rem;left:.4rem;width:calc((100% - 1.3rem) / 3);height:calc(100% - .8rem);border-radius:999px;background:linear-gradient(180deg,var(--accent-color),color-mix(in srgb,var(--accent-color) 86%,#000));box-shadow:inset 0 1.5px #fff9,inset 0 -2px 3px #00000038,0 2px 5px #00000080,0 6px 16px #00000073;transform:translate(0);transition:transform .35s cubic-bezier(.22,1,.36,1);z-index:0}.billing-toggle.is-yearly:before{transform:translate(calc(100% + .25rem))}.billing-toggle.is-two-yearly:before{transform:translate(calc(200% + .5rem))}.billing-toggle button{padding:.6rem 1.5rem;border-radius:999px;font-size:14px;font-weight:600;transition:color .2s cubic-bezier(.4,0,.2,1);color:var(--text-secondary);white-space:nowrap;background:transparent;position:relative;z-index:1;display:inline-flex;align-items:center;justify-content:center;text-align:center;line-height:1;width:100%;border:none;cursor:pointer}.billing-toggle button.active{color:var(--text-on-accent)}[data-theme=dark] .billing-toggle{box-shadow:inset 0 1px 3px #00000073,inset 0 -1px #ffffff0a}.strikethrough{text-decoration:line-through;color:var(--text-secondary);opacity:.65;margin-right:.5rem}.pricing-card.academic-highlight,.pricing-card.popular{border:1.5px solid var(--accent);transform:translateY(-6px);z-index:2}.pricing-card.plan-preselected{border:2px solid var(--accent)!important;transform:translateY(-4px)}.reg-plan-picker{min-height:var(--auth-step-body)}.reg-plan-picker .price{font-size:inherit;font-weight:inherit}.reg-plan-picker .price .text-headline{font-size:40px;font-weight:600}.reg-plan-picker .price .text-body{font-size:16px;font-weight:400}.reg-plan-picker .price .strikethrough{font-size:16px}.reg-plan-picker .popular-badge{top:0;transform:translate(-50%,-50%);color:var(--text-on-accent);padding:6px 20px;text-transform:uppercase;letter-spacing:.05em;box-shadow:0 4px 12px var(--accent-glow)}.landing-footer{background:var(--bg-secondary);border-top:1px solid var(--border-color);padding:4rem 2rem 2rem}.footer-content{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:3rem;max-width:1200px;margin:0 auto 3rem}.footer-col h4{font-size:16px;margin-bottom:1.5rem}.footer-col p{color:var(--text-secondary);margin-bottom:.75rem;font-size:16px}.footer-col p a{color:var(--text-secondary)}.footer-col p a:hover{color:var(--text-primary)}.footer-bottom{text-align:center;color:var(--text-secondary);font-size:14px;padding-top:2rem;border-top:1px solid var(--border-color)}.admin-stat-card{padding:1.5rem}.admin-stat-card h4{color:var(--text-secondary);font-size:14px;margin-bottom:.5rem;font-weight:500}.stat-value{font-size:32px;font-weight:700;color:var(--text-primary)}.admin-table-container{overflow-x:auto;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:12px}.admin-table{width:100%;border-collapse:collapse;text-align:left}.admin-table th,.admin-table td{padding:1.25rem 1.5rem;border-bottom:1px solid var(--border-color);white-space:nowrap}.admin-table th{background:var(--bg-color);font-weight:600;font-size:14px;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.05em}.admin-table tr:last-child 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