:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;color:#ffffffde;background-color:#242424;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{font-weight:500;color:#646cff;text-decoration:inherit}a:hover{color:#535bf2}body{margin:0;display:flex;place-items:center;min-width:320px;min-height:100vh}h1{font-size:3.2em;line-height:1.1}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:#1a1a1a;cursor:pointer;transition:border-color .25s}button:hover{border-color:#646cff}button:focus,button:focus-visible{outline:4px auto -webkit-focus-ring-color}@media(prefers-color-scheme:light){:root{color:#213547;background-color:#fff}a:hover{color:#747bff}button{background-color:#f9f9f9}}.sidebar-overlay{display:none}.conversation-sidebar{width:280px;height:100vh;background:#f9fafb;border-right:1px solid #e5e7eb;display:flex;flex-direction:column;flex-shrink:0}.sidebar-header{padding:16px;border-bottom:1px solid #e5e7eb;flex-shrink:0}.mobile-close-btn{display:none}.sidebar-title{font-size:16px;font-weight:700;color:#1a1a1a;margin-bottom:12px}.new-chat-btn{width:100%;display:flex;align-items:center;justify-content:center;gap:8px;padding:10px 16px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:8px;font-weight:600;cursor:pointer;transition:transform .2s,box-shadow .2s}.new-chat-btn:hover{transform:translateY(-1px);box-shadow:0 4px 12px #667eea66}.new-chat-btn:active{transform:translateY(0)}.sidebar-search{padding:12px 16px;border-bottom:1px solid #e5e7eb;display:flex;align-items:center;gap:8px;background:#fff;flex-shrink:0}.sidebar-search svg{color:#9ca3af;flex-shrink:0}.sidebar-search input{flex:1;border:none;outline:none;font-size:14px;background:transparent}.sidebar-search input::placeholder{color:#9ca3af}.conversations-list{flex:1;overflow-y:auto;padding:8px}.conversations-list::-webkit-scrollbar{width:6px}.conversations-list::-webkit-scrollbar-thumb{background:#d1d5db;border-radius:3px}.conversations-list::-webkit-scrollbar-thumb:hover{background:#9ca3af}.conversation-group{margin-bottom:16px}.group-label{font-size:11px;font-weight:600;text-transform:uppercase;color:#6b7280;padding:4px 12px;letter-spacing:.5px}.conversation-item{display:flex;align-items:center;gap:10px;padding:10px 12px;margin:2px 0;border-radius:8px;cursor:pointer;transition:background .15s;position:relative}.conversation-item:hover{background:#e5e7eb}.conversation-item.active{background:#dbeafe;font-weight:600}.conversation-item.archived{opacity:.6}.conversation-icon{color:#6b7280;flex-shrink:0}.conversation-item.active .conversation-icon{color:#3b82f6}.conversation-title{flex:1;font-size:14px;color:#1f2937;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.conversation-actions{display:flex;gap:4px;flex-shrink:0}.action-btn{width:28px;height:28px;display:flex;align-items:center;justify-content:center;background:#fff;border:none;border-radius:6px;cursor:pointer;transition:background .15s}.action-btn:hover{background:#f3f4f6}.archive-btn{color:#6b7280}.delete-btn{color:#ef4444}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:40px 20px;color:#9ca3af}.empty-state svg{margin-bottom:16px;opacity:.5}.empty-state p{margin:0;font-size:14px}.empty-subtitle{font-size:12px;color:#d1d5db;margin-top:4px!important}.sidebar-footer{padding:12px 16px;border-top:1px solid #e5e7eb;flex-shrink:0}.archive-toggle{width:100%;display:flex;align-items:center;gap:8px;padding:8px 12px;background:transparent;border:1px solid #e5e7eb;border-radius:6px;color:#6b7280;font-size:13px;cursor:pointer;transition:background .15s,border-color .15s}.archive-toggle:hover{background:#f3f4f6;border-color:#d1d5db}.archive-toggle.active{background:#fef3c7;border-color:#fbbf24;color:#92400e}@media(max-width:768px){.conversation-item .conversation-actions{display:flex!important;opacity:.7}.conversation-item:hover .conversation-actions,.conversation-item.active .conversation-actions{opacity:1}.sidebar-overlay{display:block;position:fixed;inset:0;background:#00000080;z-index:998}.conversation-sidebar{position:fixed;top:0;left:-280px;z-index:999;transition:left .3s ease;box-shadow:2px 0 8px #0000001a}.conversation-sidebar.mobile-open{left:0}.mobile-close-btn{display:block;position:absolute;top:16px;right:16px;background:none;border:none;cursor:pointer;color:#6b7280;padding:4px}.mobile-close-btn:hover{color:#1f2937}}.message-bubble{display:flex;gap:12px;margin-bottom:20px;animation:slideIn .3s ease-out}@keyframes slideIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.message-avatar{flex-shrink:0;width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:600}.message-bubble.user .message-avatar{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.message-bubble.assistant .message-avatar{background:linear-gradient(135deg,#f093fb,#f5576c);color:#fff}.message-content-wrapper{flex:1;min-width:0}.message-header{display:flex;align-items:center;gap:8px;margin-bottom:6px}.message-role{font-weight:600;font-size:14px;color:#1a1a1a}.message-timestamp{font-size:12px;color:#6b7280}.message-content{background:#f9fafb;padding:12px 16px;border-radius:12px;line-height:1.6;color:#1f2937}.message-bubble.user .message-content{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.message-bubble.assistant .message-content{background:#fff;border:1px solid #e5e7eb}.message-content p{margin:0 0 12px}.message-content p:last-child{margin-bottom:0}.message-content ul,.message-content ol{margin:8px 0;padding-left:24px}.message-content li{margin:4px 0}.message-content code{background:#f3f4f6;padding:2px 6px;border-radius:4px;font-family:Courier New,monospace;font-size:.9em}.message-bubble.user .message-content code{background:#fff3}.message-content pre{background:#1f2937;color:#f9fafb;padding:12px;border-radius:8px;overflow-x:auto;margin:12px 0}.message-content pre code{background:transparent;color:inherit;padding:0}.message-content strong{font-weight:600}.message-content em{font-style:italic}.message-content blockquote{border-left:3px solid #e5e7eb;padding-left:12px;margin:12px 0;color:#6b7280}.message-bubble.user .message-content blockquote{border-left-color:#ffffff80;color:#ffffffe6}.course-sources{margin-top:12px;padding:12px;background:#f0fdf4;border-left:3px solid #10b981;border-radius:8px}.sources-header{display:flex;align-items:center;gap:6px;font-weight:600;font-size:13px;color:#065f46;margin-bottom:8px}.sources-list{display:flex;flex-direction:column;gap:6px}.source-item{display:flex;justify-content:space-between;align-items:center;padding:6px 10px;background:#fff;border-radius:6px;font-size:13px}.source-file{color:#059669;font-weight:500;flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.source-relevance{color:#6b7280;font-size:12px;font-weight:500;flex-shrink:0}@media(max-width:640px){.message-bubble{gap:8px}.message-avatar{width:32px;height:32px}.message-content{padding:10px 12px;font-size:14px}}.chat-window{flex:1;display:flex;flex-direction:column;min-height:100vh;height:100dvh;background:#fff;overflow:hidden;padding-bottom:env(safe-area-inset-bottom)}.chat-header{padding:16px 24px;border-bottom:1px solid #e5e7eb;display:flex;align-items:center;gap:16px;background:#fff;flex-shrink:0}.mobile-menu-btn{display:none;background:none;border:none;cursor:pointer;color:#6b7280;padding:8px}.mobile-menu-btn:hover{color:#1f2937}.chat-title{flex:1;font-size:18px;font-weight:600;color:#1a1a1a;margin:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.sources-toggle{display:flex;align-items:center;gap:6px;padding:8px 12px;background:#f3f4f6;border:none;border-radius:6px;color:#6b7280;font-size:13px;font-weight:500;cursor:pointer;transition:all .15s}.sources-toggle:hover{background:#e5e7eb;color:#1f2937}.sources-toggle.active{background:#dbeafe;color:#1e40af}.messages-area{flex:1;overflow-y:auto;padding:24px;background:#f9fafb}.messages-area::-webkit-scrollbar{width:8px}.messages-area::-webkit-scrollbar-thumb{background:#d1d5db;border-radius:4px}.messages-area::-webkit-scrollbar-thumb:hover{background:#9ca3af}.messages-list{max-width:900px;margin:0 auto}.welcome-screen{max-width:700px;margin:0 auto;padding:60px 20px;text-align:center}.welcome-header{margin-bottom:48px}.welcome-icon{font-size:64px;margin-bottom:16px}.welcome-header h1{font-size:32px;font-weight:700;color:#1a1a1a;margin:0 0 12px}.welcome-header p{font-size:16px;color:#6b7280;margin:0}.suggestions{text-align:left}.suggestions-label{font-size:13px;font-weight:600;color:#6b7280;margin-bottom:12px;text-transform:uppercase;letter-spacing:.5px}.suggestions-grid{display:grid;gap:10px}.suggestion-chip{padding:14px 18px;background:#fff;border:1px solid #e5e7eb;border-radius:10px;text-align:left;color:#1f2937;font-size:14px;cursor:pointer;transition:all .15s}.suggestion-chip:hover{background:#f9fafb;border-color:#667eea;transform:translateY(-1px);box-shadow:0 4px 12px #00000014}.typing-indicator{display:flex;align-items:center;gap:4px;padding:12px 16px;background:#fff;border:1px solid #e5e7eb;border-radius:12px}.typing-dot{width:8px;height:8px;border-radius:50%;background:#9ca3af;animation:typingAnimation 1.4s infinite}.typing-dot:nth-child(2){animation-delay:.2s}.typing-dot:nth-child(3){animation-delay:.4s}@keyframes typingAnimation{0%,60%,to{transform:translateY(0);opacity:.7}30%{transform:translateY(-8px);opacity:1}}.input-area{padding:16px 24px 24px;border-top:1px solid #e5e7eb;background:#fff;flex-shrink:0}.input-form{max-width:900px;margin:0 auto;display:flex;gap:12px;align-items:flex-end}.message-input{flex:1;min-height:44px;max-height:200px;padding:12px 16px;border:1px solid #d1d5db;border-radius:12px;font-size:15px;line-height:1.5;resize:none;font-family:inherit;transition:border-color .15s,box-shadow .15s}.message-input:focus{outline:none;border-color:#667eea;box-shadow:0 0 0 3px #667eea1a}.message-input:disabled{background:#f9fafb;color:#9ca3af;cursor:not-allowed}.send-button{width:44px;height:44px;flex-shrink:0;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#667eea,#764ba2);border:none;border-radius:12px;color:#fff;cursor:pointer;transition:transform .15s,box-shadow .15s}.send-button:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 4px 12px #667eea66}.send-button:active:not(:disabled){transform:translateY(0)}.send-button:disabled{opacity:.4;cursor:not-allowed}.spinning{animation:spin 1s linear infinite}.input-hint{max-width:900px;margin:8px auto 0;font-size:12px;color:#9ca3af;text-align:center}.input-hint kbd{padding:2px 6px;background:#f3f4f6;border:1px solid #d1d5db;border-radius:4px;font-family:monospace;font-size:11px}@media(max-width:768px){.mobile-menu-btn{display:block}.chat-header{padding:12px 16px}.chat-title{font-size:16px}.sources-toggle span{display:none}.messages-area{padding:16px}.input-area{padding:12px 16px 16px}.message-input{font-size:16px}.welcome-screen{padding:40px 16px}.welcome-header h1{font-size:24px}.welcome-icon{font-size:48px}.suggestions-grid{gap:8px}.suggestion-chip{padding:12px 14px;font-size:13px}}.login-container{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#667eea,#764ba2);padding:20px}.login-box{background:#fff;border-radius:12px;box-shadow:0 20px 60px #0000004d;padding:40px;width:100%;max-width:420px}.login-header{text-align:center;margin-bottom:32px}.login-header h1{font-size:28px;font-weight:700;color:#1a202c;margin:0 0 8px}.login-header p{font-size:14px;color:#718096;margin:0}.login-form{display:flex;flex-direction:column;gap:20px}.login-error{background-color:#fee;border:1px solid #fcc;color:#c33;padding:12px;border-radius:6px;font-size:14px}.form-group{display:flex;flex-direction:column;gap:8px}.form-group label{font-size:14px;font-weight:500;color:#2d3748}.form-group input{padding:12px 16px;border:2px solid #e2e8f0;border-radius:8px;font-size:15px;transition:all .2s;outline:none}.form-group input:focus{border-color:#667eea;box-shadow:0 0 0 3px #667eea1a}.form-group input:disabled{background-color:#f7fafc;cursor:not-allowed}.login-button{padding:14px 24px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:8px;font-size:16px;font-weight:600;cursor:pointer;transition:all .2s;margin-top:8px}.login-button:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 8px 16px #667eea4d}.login-button:active:not(:disabled){transform:translateY(0)}.login-button:disabled{opacity:.6;cursor:not-allowed}.login-footer{margin-top:24px;text-align:center;padding-top:24px;border-top:1px solid #e2e8f0}.login-footer p{font-size:13px;color:#a0aec0;margin:0}@media(max-width:480px){.login-box{padding:32px 24px}.login-header h1{font-size:24px}}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:#fff;color:#1f2937}.app{width:100vw;height:100vh;overflow:hidden}.app-layout{display:flex;height:100%;width:100%}.error-toast{position:fixed;top:20px;right:20px;background:#fee2e2;border:1px solid #fca5a5;color:#991b1b;padding:12px 16px;border-radius:8px;box-shadow:0 4px 12px #00000026;z-index:1000;display:flex;align-items:center;gap:12px;animation:slideInRight .3s ease-out;max-width:400px}@keyframes slideInRight{0%{transform:translate(100%);opacity:0}to{transform:translate(0);opacity:1}}.error-toast button{background:none;border:none;color:#991b1b;font-size:20px;cursor:pointer;padding:0;width:20px;height:20px;display:flex;align-items:center;justify-content:center}.loading-spinner{display:flex;align-items:center;justify-content:center;padding:40px}.spinner{width:40px;height:40px;border:3px solid #e5e7eb;border-top-color:#667eea;border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@media(max-width:768px){.error-toast{top:10px;right:10px;left:10px;max-width:none}}
