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spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}[data-theme=dark] .language-switcher-button{background:var(--bg-secondary, #2d2d2d);border-color:var(--border-color, #404040);color:var(--text-primary, #ffffff)}[data-theme=dark] .language-switcher-button:hover{background:var(--bg-primary, #1a1a1a)}[data-theme=dark] .language-dropdown{background:var(--bg-primary, #1a1a1a);border-color:var(--border-color, #404040)}[data-theme=dark] .language-option:hover{background:var(--bg-secondary, #2d2d2d)}[data-theme=dark] .language-option.active{background:#4a9eff33}.language-switcher.in-dropdown{width:100%}.language-switcher-button.dropdown-style{width:100%;background:none;border:none;padding:.75rem 1rem;border-radius:6px;justify-content:flex-start;color:#2d3748;font-size:14px}.language-switcher-button.dropdown-style:hover{background:#f7fafc;border-color:transparent}.language-switcher.in-dropdown 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h2{font-size:18px;font-weight:700;color:#2d3748}.close-button{width:32px;height:32px;border:none;background:none;color:#718096;cursor:pointer;border-radius:6px;display:flex;align-items:center;justify-content:center;transition:all .3s ease}.close-button:hover{background:#f7fafc;color:#2d3748}.sidebar-nav{flex:1;padding:1rem;overflow-y:auto}.nav-item{display:flex;align-items:center;gap:.75rem;padding:.875rem 1rem;color:#718096;text-decoration:none;border-radius:8px;font-size:14px;font-weight:500;transition:all .3s ease;margin-bottom:.5rem}.nav-item:hover{background:#f7fafc;color:#667eea}.nav-item.active{background:#eef2ff;color:#667eea}.sidebar-footer{padding:1.5rem;border-top:1px solid #e2e8f0;text-align:center}.footer-text{font-size:12px;color:#a0aec0}.app-footer{background:#fff;border-top:1px solid #e2e8f0;padding:1.5rem;margin-top:auto}.footer-content{max-width:1200px;margin:0 auto;display:flex;justify-content:space-between;align-items:center}.footer-content p{font-size:14px;color:#718096}.footer-links{display:flex;gap:1.5rem}.footer-links a{font-size:14px;color:#718096;text-decoration:none;transition:color .3s ease}.footer-links a:hover{color:#667eea}@media (max-width: 768px){.app-header{padding:0 1rem}.header-logo span,.user-name,.new-chat-text{display:none}.new-chat-button{padding:.375rem;margin-left:.5rem}.footer-content{flex-direction:column;gap:1rem;text-align:center}.footer-links{flex-direction:column;gap:.5rem}}@media (min-width: 1024px){.menu-button{display:none}.app-sidebar{left:0;position:relative}.sidebar-overlay,.sidebar-header{display:none}}.new-chat-button{display:flex;align-items:center;justify-content:center;gap:6px;width:calc(100% - 24px);margin:12px;padding:.375rem .75rem;background-color:var(--accent-color, #667eea);color:#fff;border:none;border-radius:6px;cursor:pointer;font-size:13px;font-weight:500;transition:all .3s ease;box-shadow:0 2px 4px 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spin{to{transform:rotate(360deg)}}.loading-text{font-size:14px;color:var(--text-secondary, #666666)}.sidebar-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:48px 24px;text-align:center}.empty-icon{font-size:48px;margin-bottom:16px;opacity:.5}.empty-message{margin:0 0 8px;font-size:16px;font-weight:500;color:var(--text-primary, #333333)}.empty-hint{margin:0 0 16px;font-size:14px;color:var(--text-secondary, #666666)}.empty-action{padding:8px 16px;background-color:var(--accent-color, #007bff);color:#fff;border:none;border-radius:6px;cursor:pointer;font-size:14px;font-weight:500;transition:background-color .2s}.empty-action:hover{background-color:var(--accent-color-dark, #0056b3)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border-width:0}@media (max-width: 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