[data-theme="dark"]{--bg-primary:#1e1e1e;--bg-secondary:#181818;--bg-tertiary:#252526;--bg-elevated:#2d2d2d;--bg-overlay:rgba(0, 0, 0, 0.7);--text-primary:#cccccc;--text-secondary:#9d9d9d;--text-tertiary:#6e6e6e;--text-muted:#4d4d4d;--text-inverse:#1e1e1e;--border-primary:#2d2d2d;--border-secondary:#3e3e3e;--border-focus:var(--color-accent);--bg-user-message:#252526;--bg-ai-message:#1e1e1e;--border-message:#2d2d2d;--bg-code:#1e1e1e;--text-code:#d4d4d4;--color-accent:#0078d4;--color-accent-hover:#1e8ad4;--color-accent-muted:rgba(0, 120, 212, 0.15);--shadow-xs:0 1px 2px rgba(0, 0, 0, 0.2);--shadow-sm:0 1px 3px rgba(0, 0, 0, 0.3);--shadow-md:0 4px 6px rgba(0, 0, 0, 0.3);--shadow-lg:0 10px 15px rgba(0, 0, 0, 0.4);--shadow-overlay:0 25px 50px rgba(0, 0, 0, 0.5);--scrollbar-thumb:#5a5a5a;--scrollbar-track:transparent}[data-theme="dark"] body{background-color:#0d0d0d}[data-theme="dark"] .tab-bar{background-color:#181818;border-bottom-color:#252526}[data-theme="dark"] .tab-item{background-color:#fff0}[data-theme="dark"] .tab-item:hover{background-color:#2d2d2d}[data-theme="dark"] .tab-item.active,[data-theme="dark"] .tab-item[aria-selected="true"]{background-color:#1e1e1e;border-color:#2d2d2d}[data-theme="dark"] .tab-name{color:#9d9d9d}[data-theme="dark"] .tab-learning .tab-name{border-left-color:#c77d00}[data-theme="dark"] .tab-item.active .tab-name,[data-theme="dark"] .tab-item[aria-selected="true"] .tab-name{color:#ccc}[data-theme="dark"] .tab-add{background-color:#fff0;border-color:#3e3e3e;color:#9d9d9d}[data-theme="dark"] .tab-add:hover{background-color:#2d2d2d;color:#ccc}[data-theme="dark"] .tab-edit{color:#6e6e6e}[data-theme="dark"] .tab-edit:hover{color:#0078d4}[data-theme="dark"] .tab-quiz .tab-name{border-left-color:#2dd4bf}[data-theme="dark"] .message-plan{border-left-color:#818cf8;background:rgb(129 140 248 / .06)}[data-theme="dark"] .plan-block{border-color:#334155;background:linear-gradient(180deg,#1e293b 0%,#0f172a 100%);box-shadow:0 4px 16px rgb(0 0 0 / .3)}[data-theme="dark"] .plan-block-header{background:linear-gradient(135deg,#0d9488,#6366f1);color:#fff}[data-theme="dark"] .plan-block-body{background:#fff0}[data-theme="dark"] .plan-lesson-number{background:linear-gradient(135deg,#6366f1,#8b5cf6)}[data-theme="dark"] .plan-section-shell{border-color:#334155;background:rgb(30 41 59 / .85)}[data-theme="dark"] .plan-section-kicker{color:#94a3b8}[data-theme="dark"] .plan-section-title{color:#f1f5f9}[data-theme="dark"] .plan-section-desc{color:#94a3b8}[data-theme="dark"] .plan-lesson{border-bottom-color:#334155}[data-theme="dark"] .plan-lesson-title{color:#e2e8f0}[data-theme="dark"] .plan-lesson-desc{color:#94a3b8}[data-theme="dark"] .plan-raw-content{color:#cbd5e1}[data-theme="dark"] .plan-sublesson{border-bottom-color:#1e293b}[data-theme="dark"] .plan-sublesson-number{background:#6366f1}[data-theme="dark"] .plan-sublesson-title{color:#e2e8f0}[data-theme="dark"] .plan-sublesson-desc{color:#94a3b8}[data-theme="dark"] .lesson-inline-title{color:#22d3ee;border-bottom-color:rgb(34 211 238 / .35)}[data-theme="dark"] .sublesson-inline-title{color:#a78bfa;border-bottom-color:rgb(167 139 250 / .3)}[data-theme="dark"] .search-panel{background-color:#1e1e1e;border-bottom-color:#252526;box-shadow:0 4px 12px rgb(0 0 0 / .4)}[data-theme="dark"] .search-panel-header{border-bottom-color:#252526}[data-theme="dark"] .search-input{background-color:#252526;border-color:#3e3e3e;color:#ccc}[data-theme="dark"] .search-input:focus{border-color:#0078d4}[data-theme="dark"] .search-result-item{border-bottom-color:#252526}[data-theme="dark"] .search-result-item:hover{background-color:#252526}[data-theme="dark"] .search-result-snippet mark{background-color:rgb(0 120 212 / .25);color:#ccc}[data-theme="dark"] .search-filter-select{background:#252526;border-color:#3c3c3c;color:#ccc}[data-theme="dark"] .search-filters{border-bottom-color:#252526}[data-theme="dark"] .settings-panel{background-color:#1e1e1e;border-bottom-color:#2d2d2d}[data-theme="dark"] .settings-header:hover{background-color:#252526}[data-theme="dark"] .settings-panel.overlay-mode{background-color:#1e1e1e}[data-theme="dark"] .preset-selector-wrapper{border-bottom-color:#3e3e3e}[data-theme="dark"] .preset-select{background-color:#252526;border-color:#3e3e3e;color:#ccc;background-image: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='%239d9d9d' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E")}[data-theme="dark"] .preset-select:hover{border-color:#4e4e4e;background-color:#2d2d2d}[data-theme="dark"] .preset-select:focus{border-color:#0078d4;background-color:#1e1e1e}[data-theme="dark"] .preset-select option{background-color:#1e1e1e;color:#ccc}[data-theme="dark"] .preset-select optgroup{background-color:#252526;color:#9d9d9d}[data-theme="dark"] .preset-select option:disabled{color:#6e6e6e}[data-theme="dark"] .settings-toggle-btn{border-color:#3e3e3e;color:#9d9d9d}[data-theme="dark"] .settings-toggle-btn:hover{background-color:#2d2d2d;color:#ccc}[data-theme="dark"] .input-wrapper input,[data-theme="dark"] .input-wrapper textarea,[data-theme="dark"] input[type="number"]{background-color:#252526;border-color:#3e3e3e;color:#ccc}[data-theme="dark"] .input-wrapper input:hover,[data-theme="dark"] .input-wrapper textarea:hover,[data-theme="dark"] input[type="number"]:hover{border-color:#4e4e4e}[data-theme="dark"] .input-wrapper input:focus,[data-theme="dark"] .input-wrapper textarea:focus,[data-theme="dark"] input[type="number"]:focus{background-color:#1e1e1e;border-color:var(--color-accent)}[data-theme="dark"] .input-wrapper input::placeholder,[data-theme="dark"] .input-wrapper textarea::placeholder{color:#6e6e6e}[data-theme="dark"] .input-copy-btn,[data-theme="dark"] .input-toggle-password{color:#6e6e6e}[data-theme="dark"] .input-copy-btn:hover,[data-theme="dark"] .input-toggle-password:hover{background-color:#3e3e3e;color:#ccc}[data-theme="dark"] input[type="range"]{background:#3e3e3e}[data-theme="dark"] input[type="range"]::-webkit-slider-thumb{background:var(--color-accent)}[data-theme="dark"] .theme-toggle{background-color:var(--color-accent)}[data-theme="dark"] .theme-toggle-slider{background-color:#1e1e1e}[data-theme="dark"] .theme-toggle-slider svg{color:var(--color-accent)}[data-theme="dark"] .tab-panels{background:radial-gradient(circle,#000000 0%,#353535 75%);.tab-panel{box-shadow:0 0 16px rgb(159 108 23 / 21%)}}[data-theme="dark"] .chat-area{background-color:#1e1e1e}[data-theme="dark"] .message-user .message-avatar{background-color:var(--color-accent)}[data-theme="dark"] .message-content{border-color:#2d2d2d;background-color:#252526}[data-theme="dark"] .copy-btn{color:#6e6e6e}[data-theme="dark"] .copy-btn:hover{color:#0078d4}[data-theme="dark"] .copy-btn.copied{color:#4ade80}[data-theme="dark"] .save-note-btn{color:#6e6e6e}[data-theme="dark"] .save-note-btn:hover{color:#0078d4}[data-theme="dark"] .toolbar-profile-link{background:#0078d4}[data-theme="dark"] .quota-indicator{--quota-track:#363636}[data-theme="dark"] .has-tooltip::after{background:#e2e8f0;color:#1e293b;box-shadow:0 2px 8px rgb(0 0 0 / .3)}[data-theme="dark"] .message-copy-btn{background:#2d2d2d;border-color:#3e3e3e;color:#9d9d9d}[data-theme="dark"] .message-copy-btn:hover{background-color:#3e3e3e;color:#ccc}[data-theme="dark"] .message-content code:not(pre code){background-color:#3e3e3e;color:#d4d4d4}[data-theme="dark"] .code-block-wrapper{border-color:#3e3e3e}[data-theme="dark"] .code-block-header{background-color:#252526;border-bottom-color:#3e3e3e}[data-theme="dark"] .code-block-language{color:#858585}[data-theme="dark"] .code-block-copy{border-color:#4e4e4e;color:#858585}[data-theme="dark"] .code-block-copy:hover{background-color:#3e3e3e;border-color:#5e5e5e;color:#ccc}[data-theme="dark"] .code-block-wrapper pre{background-color:#1e1e1e}[data-theme="dark"] .message-content th,[data-theme="dark"] .message-content td{border-color:#3e3e3e}[data-theme="dark"] .message-content th{background-color:#252526}[data-theme="dark"] .chat-input-area{background-color:#1e1e1e;border-top-color:#2d2d2d}[data-theme="dark"] .chat-input{background-color:#252526;border-color:#3e3e3e;color:#ccc}[data-theme="dark"] .chat-input::placeholder{color:#6e6e6e}[data-theme="dark"] .chat-input-copy{color:#6e6e6e}[data-theme="dark"] .chat-input-copy:hover{background-color:#3e3e3e;color:#ccc}[data-theme="dark"] .chat-send-btn{background-color:var(--color-accent)}[data-theme="dark"] .chat-send-btn:hover:not(:disabled){background-color:var(--color-accent-hover)}[data-theme="dark"] .chat-send-btn:disabled{background-color:#3e3e3e}[data-theme="dark"] .toast{background-color:#2d2d2d;border-color:#3e3e3e}[data-theme="dark"] .typing-indicator span{background-color:#6e6e6e}[data-theme="dark"] .streaming-cursor{background-color:var(--accent,#60a5fa)}[data-theme="dark"] .chat-empty-state-icon{color:#4e4e4e}[data-theme="dark"] .hljs{background:#1e1e1e;color:#d4d4d4}[data-theme="dark"] .hljs-keyword,[data-theme="dark"] .hljs-selector-tag,[data-theme="dark"] .hljs-literal,[data-theme="dark"] .hljs-section,[data-theme="dark"] .hljs-link{color:#569cd6}[data-theme="dark"] .hljs-string,[data-theme="dark"] .hljs-title,[data-theme="dark"] .hljs-name,[data-theme="dark"] .hljs-type,[data-theme="dark"] .hljs-attribute,[data-theme="dark"] .hljs-symbol,[data-theme="dark"] .hljs-bullet,[data-theme="dark"] .hljs-addition,[data-theme="dark"] .hljs-variable,[data-theme="dark"] .hljs-template-tag,[data-theme="dark"] .hljs-template-variable{color:#ce9178}[data-theme="dark"] .hljs-comment,[data-theme="dark"] .hljs-quote,[data-theme="dark"] .hljs-deletion,[data-theme="dark"] .hljs-meta{color:#6a9955}[data-theme="dark"] .hljs-function,[data-theme="dark"] .hljs-title.function_{color:#dcdcaa}[data-theme="dark"] .hljs-class,[data-theme="dark"] .hljs-title.class_{color:#4ec9b0}[data-theme="dark"] .hljs-number,[data-theme="dark"] .hljs-built_in{color:#b5cea8}[data-theme="dark"] .hljs-params{color:#9cdcfe}[data-theme="dark"] .hljs-property{color:#9cdcfe}[data-theme="dark"] .hljs-punctuation{color:#d4d4d4}[data-theme="dark"] .hljs-attr{color:#9cdcfe}[data-theme="dark"] .hljs-regexp{color:#d16969}[data-theme="dark"] .katex{color:#ccc}[data-theme="dark"] .advanced-settings{border-top-color:#2d2d2d}[data-theme="dark"] .continue-wrapper{background-color:#181818;border-top-color:#2d2d2d}[data-theme="dark"] .continue-btn{background-color:rgb(0 120 212 / .15);border-color:#0078d4;color:#4da6ff}[data-theme="dark"] .continue-btn:hover{background-color:#0078d4;color:#fff}[data-theme="dark"] .info-tooltip{color:#6e6e6e}[data-theme="dark"] .info-tooltip:hover{color:#9d9d9d}[data-theme="dark"] .setting-hint{color:#6e6e6e}[data-theme="dark"] .toggle-label input[type="checkbox"]{accent-color:#0078d4}[data-theme="dark"] .settings-group select[data-field="model-type"]{background-color:#2d2d2d;border-color:#3e3e3e;color:#ccc;background-image: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='%236e6e6e' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E")}[data-theme="dark"] .settings-group select[data-field="model-type"]:hover{background-color:#3e3e3e;border-color:#4e4e4e}[data-theme="dark"] .settings-group select[data-field="model-type"]:focus{border-color:#0078d4;background-color:#252526;box-shadow:0 0 0 3px rgb(0 120 212 / .2)}[data-theme="dark"] .generated-image{box-shadow:0 4px 6px rgb(0 0 0 / .4)}[data-theme="dark"] .embed-image-pending{border-color:#4b5563;background:linear-gradient(180deg,rgb(0 120 212 / .14),rgb(30 30 30 / .4));color:#b9c0c9}[data-theme="dark"] .embed-image-pending[data-embed-status="not-found"]{border-color:rgb(248 113 113 / .5);background:rgb(127 29 29 / .2);color:#fca5a5}[data-theme="dark"] .attached-image{box-shadow:0 2px 4px rgb(0 0 0 / .3)}[data-theme="dark"] .attached-image:hover{box-shadow:0 4px 8px rgb(0 0 0 / .5)}[data-theme="dark"] .tikz-block{border-color:#343434;background-color:#141414}[data-theme="dark"] .tikz-block-header{background-color:#1a1a1a;border-bottom-color:#2f2f2f}[data-theme="dark"] .tikz-block pre{background-color:#1e1e1e}[data-theme="dark"] .tikz-render-container{background-color:#000}[data-theme="dark"] .smiles-block{border-color:#343434;background-color:#141414}[data-theme="dark"] .smiles-render-container{background-color:#000}[data-theme="dark"] .chart-block{border-color:#3e3e3e}[data-theme="dark"] .chart-block-header{background-color:#252526;border-bottom-color:#3e3e3e}[data-theme="dark"] .genimage-block{border-color:#3e3e3e}[data-theme="dark"] .genimage-block-header{background-color:#252526;border-bottom-color:#3e3e3e}[data-theme="dark"] .genimage-container{background-color:#1e1e1e}[data-theme="dark"] .action-btn{background-color:#2d2d2d;border-color:#3e3e3e;color:#9d9d9d}[data-theme="dark"] .action-btn:hover{background-color:#3e3e3e;border-color:#4e4e4e;color:#ccc}[data-theme="dark"] .action-btn-danger{color:#f87171;border-color:rgb(248 113 113 / .3)}[data-theme="dark"] .action-btn-danger:hover{background-color:rgb(248 113 113 / .1);border-color:#f87171;color:#f87171}[data-theme="dark"] .advanced-toggle-btn{background-color:#252526;border-color:#3e3e3e;color:#9d9d9d}[data-theme="dark"] .advanced-toggle-btn:hover{background-color:#2d2d2d;border-color:#4e4e4e;color:#ccc}[data-theme="dark"] .attach-btn{background-color:#2d2d2d;border-color:#3e3e3e;color:#9d9d9d}[data-theme="dark"] .attach-btn:hover{background-color:#3e3e3e;border-color:#4e4e4e;color:#0078d4}[data-theme="dark"] .attachments-preview{background-color:#252526;border-color:#3e3e3e}[data-theme="dark"] .attachment-item{background-color:#1e1e1e;border-color:#3e3e3e}[data-theme="dark"] .task-btn{background-color:#2d2d2d;border-color:#3e3e3e;color:#9d9d9d}[data-theme="dark"] .task-btn:hover{background-color:#3e3e3e;border-color:#4e4e4e;color:#f97316}[data-theme="dark"] .task-dropdown{background-color:#252526;border-color:#3e3e3e;box-shadow:0 4px 16px rgb(0 0 0 / .4)}[data-theme="dark"] .task-dropdown-item{color:#ccc}[data-theme="dark"] .task-dropdown-item:hover{background-color:#2d2d2d}[data-theme="dark"] .task-dropdown-header{color:#888;border-color:#3e3e3e}[data-theme="dark"] .task-dropdown-footer{color:#888;border-color:#3e3e3e}[data-theme="dark"] .document-block{border-color:#3e3e3e;box-shadow:0 2px 8px rgb(0 0 0 / .3)}[data-theme="dark"] .document-block-header{background-color:#2d2d2d;border-color:#3e3e3e}[data-theme="dark"] .document-block-label{color:#9d9d9d}[data-theme="dark"] .document-action-btn{background-color:#252526;border-color:#3e3e3e;color:#9d9d9d}[data-theme="dark"] .document-action-btn:hover{background-color:#3e3e3e;border-color:#4e4e4e;color:#0078d4}[data-theme="dark"] .document-loading{background:linear-gradient(90deg,#1e1e1e 25%,#2a2a2a 50%,#1e1e1e 75%);background-size:200% 100%;animation:doc-shimmer 1.5s ease-in-out infinite;color:#777}[data-theme="dark"] .document-loading-spinner{border-color:#3e3e3e;border-top-color:#0078d4}[data-theme="dark"] .document-block--loading{border-color:#3e3e3e;box-shadow:0 2px 8px rgb(0 0 0 / .3)}[data-theme="dark"] .attachment-icon{color:#6e6e6e}[data-theme="dark"] .attachment-name{color:#9d9d9d}[data-theme="dark"] .attachment-remove{color:#6e6e6e}[data-theme="dark"] .attachment-remove:hover{background-color:rgb(248 113 113 / .15);color:#f87171}[data-theme="dark"] .message-error{background-color:rgb(248 113 113 / .08);border-color:rgb(248 113 113 / .2)}[data-theme="dark"] .message-error .message-header{color:#f87171}[data-theme="dark"] .message-error .error-avatar{background-color:rgb(248 113 113 / .15);color:#f87171}[data-theme="dark"] .message-error .error-content{color:#f87171}[data-theme="dark"] .message-retry-btn{color:#6e6e6e}[data-theme="dark"] .message-retry-btn:hover{background-color:#3e3e3e;color:#0078d4}[data-theme="dark"] .debug-box-header{color:#9d9d9d}[data-theme="dark"] .debug-box-header:hover{background:#2d2d2d}[data-theme="dark"] .debug-box-copy-btn{background:#fff0;border-color:#3e3e3e;color:#6e6e6e}[data-theme="dark"] .debug-box-copy-btn:hover{background:#2d2d2d;color:#0078d4;border-color:#0078d4}[data-theme="dark"] .debug-box-arrow{color:#6e6e6e}[data-theme="dark"] .debug-box-content{background:#1e1e1e}[data-theme="dark"] .debug-section-title{color:#569cd6}[data-theme="dark"] .debug-item{color:#9e9e9e}[data-theme="dark"] .debug-item b{color:#d4d4d4}[data-theme="dark"] .debug-copy-btn{background:#2d2d2d;border-color:#3e3e3e;color:#6e6e6e}[data-theme="dark"] .debug-copy-btn:hover{background:#3e3e3e;color:#0078d4;border-color:#0078d4}[data-theme="dark"] .error-report-btn{border-color:rgb(248 113 113 / .3);color:#f87171}[data-theme="dark"] .error-report-btn:hover{background:rgb(248 113 113 / .1);border-color:#f87171}[data-theme="dark"] .thinking-block{background:#1a1a1a;border-color:#333}[data-theme="dark"] .thinking-content{border-top-color:#333;color:#999}[data-theme="dark"] .tool-status-pill{background:#1a1a1a;border-color:#333;color:#999}[data-theme="dark"] .app-loading{background-color:#0a0a0a}[data-theme="dark"] .app-loading-spinner{border-color:#262626;border-top-color:#fafafa}[data-theme="dark"] #guest-overlay .login-card{background:#1f2937}[data-theme="dark"] #guest-overlay .login-card-body label{color:#d1d5db}[data-theme="dark"] #guest-overlay .login-card-body input[type="text"],[data-theme="dark"] #guest-overlay .login-card-body input[type="password"]{background:#111827;border-color:#374151;color:#f3f4f6}[data-theme="dark"] #guest-overlay .login-card-body input:focus{border-color:#818cf8}[data-theme="dark"] #guest-overlay .login-card-footer{color:#9ca3af}[data-theme="dark"] #guest-overlay .login-card-footer a{color:#818cf8}[data-theme="dark"] #guest-overlay .toggle-password{color:#6e6e6e}[data-theme="dark"] #guest-overlay .toggle-password:hover{color:#9ca3af}[data-theme="dark"] #guest-overlay .toggle-password:focus{color:#818cf8}