:root{--bg-primary: #ffffff;--bg-secondary: #f9f9f9;--bg-hover: #f0f0f0;--bg-message-user: #f1f3f5;--bg-message-bot: transparent;--bg-button-primary: #4b5563;--bg-button-primary-hover: #374151;--bg-button-disabled: #d1d5db;--text-primary: #0d0d0d;--text-muted: #9ca3af;--text-button: #ffffff;--border-light: #e5e5e5;--border-medium: #d1d5db;--border-focus: #6b7280;--shadow-focus: rgba(107, 114, 128, .1)}*{margin:0;padding:0;box-sizing:border-box}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;line-height:1.5}.app-layout{display:flex;height:100vh;width:100vw}.sidebar{width:260px;background-color:var(--bg-secondary);border-right:1px solid var(--border-light);display:flex;flex-direction:column;height:100%;position:relative}.main-content{flex:1;overflow-y:auto}.sidebar-header{padding:.75em;display:flex;align-items:center;gap:1em;border-bottom:1px solid var(--border-light)}.chatbot-title{font-size:1.125rem;font-weight:600;color:var(--text-primary);flex-grow:1}.new-chat-btn{display:flex;align-items:center;background:transparent;color:var(--text-primary);border:1px solid var(--border-medium);border-radius:6px;padding:.5rem;font-size:.875rem;text-decoration:none;cursor:pointer;transition:background .1s ease}.new-chat-btn:hover{background:var(--bg-hover)}.chat-threads-list{flex:1;overflow-y:auto}.search-container{padding:.5rem;border-bottom:1px solid var(--border-light)}.search-input{width:100%;border:1px solid var(--border-medium);border-radius:6px;padding:.5rem .75rem;font-size:.875rem;background:var(--bg-primary);color:var(--text-primary);outline:none;font-family:inherit;transition:border-color .2s ease,box-shadow .2s ease}.search-input:focus{border-color:var(--border-focus);box-shadow:0 0 0 2px var(--shadow-focus)}.search-input::placeholder{color:var(--text-muted)}.chat-threads-list ul{list-style:none;padding:.5em;margin:0}.chat-thread-item{margin-bottom:.25rem}.chat-thread-item-content{display:flex;align-items:center;border-radius:6px;transition:background .1s ease;position:relative}.chat-thread-item-content:hover{background:var(--bg-hover)}.chat-thread-link{display:block;flex:1;background:transparent;border:none;padding:.75rem;text-align:left;font-size:.875rem;color:var(--text-primary);text-decoration:none;cursor:pointer;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chat-thread-link-active{font-weight:700}.chat-thread-link-pending{animation:pulse .6s ease-in-out infinite}@keyframes pulse{0%,to{color:var(--text-primary)}50%{color:var(--text-muted)}}.delete-thread-btn{background:transparent;border:none;color:var(--text-primary);font-size:1.2rem;width:24px;height:24px;border-radius:4px;cursor:pointer;display:flex;align-items:center;justify-content:center;margin-right:.5rem;opacity:0;transition:opacity .2s ease,background .1s ease}.chat-thread-item-content:hover .delete-thread-btn{opacity:1}.delete-thread-btn:hover{background:#ef44441a;color:#ef4444}.delete-thread-btn:focus{outline:2px solid var(--border-focus);outline-offset:1px;opacity:1}.sidebar-footer{border-top:1px solid var(--border-light);display:flex;align-items:center;padding:.75rem;justify-content:space-between}.user-profile{text-decoration:none;display:flex;align-items:center;gap:.75rem;border-radius:6px;cursor:pointer;transition:background .1s ease}.user-profile:hover{background:var(--bg-hover)}.user-avatar{border-radius:50%;border:none}.user-name{font-size:.875rem}.logout-btn{background:transparent;font-size:1.2rem;cursor:pointer;border-radius:4px;padding:.25rem .5rem;border:1px solid var(--border-medium);transition:background .1s ease}.logout-btn:hover{background-color:var(--bg-hover)}.chat-container{display:flex;flex-direction:column;height:100vh;width:100%;padding:0}.chat-thread-header{padding:3rem 2rem;color:var(--text-muted);display:flex;align-items:center;gap:1rem;justify-content:center}.chat-messages{flex:1;padding:2rem 1rem;display:flex;flex-direction:column;gap:1rem;max-width:800px;margin:0 auto;width:100%}.message{display:flex;margin-bottom:1rem}.user-message{justify-content:flex-end}.bot-message{justify-content:flex-start}.message-content{max-width:70%;padding:.75rem 1rem;border-radius:18px;font-size:.9rem;line-height:1.4;white-space:pre-wrap}.user-message .message-content{background-color:var(--bg-message-user);color:var(--text-primary);border:1px solid var(--border-light);border-bottom-right-radius:4px}.bot-message .message-content{background-color:var(--bg-message-bot);color:var(--text-primary);border:none;border-bottom-left-radius:4px}.chat-input-container{padding:1rem;border-top:1px solid var(--border-light);background:var(--bg-primary);position:sticky;bottom:0}.chat-input-wrapper{display:flex;gap:.5rem;max-width:800px;margin:0 auto}.chat-input{flex:1;border:1px solid var(--border-medium);border-radius:12px;padding:.75rem 1rem;font-size:.9rem;resize:none;outline:none;font-family:inherit;min-height:44px;max-height:120px}.chat-input:focus{border-color:var(--border-focus);box-shadow:0 0 0 2px var(--shadow-focus)}.send-button{background:var(--bg-button-primary);color:var(--text-button);border:none;border-radius:12px;padding:.75rem 1.5rem;font-size:.9rem;font-weight:500;cursor:pointer;transition:background .2s ease;height:44px}.send-button:hover{background:var(--bg-button-primary-hover)}.send-button:disabled{background:var(--bg-button-disabled);cursor:not-allowed}.error-message{background:#fee;color:#c00;padding:.75rem 1rem;margin:1rem;border-radius:8px;border:1px solid #fcc;font-size:.875rem}.thread-title-edit-link{font-size:.875rem;color:var(--text-muted);text-decoration:none;border:1px solid var(--border-medium);border-radius:6px;padding:.25rem .5rem;transition:background .1s ease}.thread-title-edit-link:hover{background:var(--bg-hover)}.edit-title-overlay{width:100%;background:var(--bg-secondary);padding:1rem;border-bottom:1px solid var(--border-light)}.edit-title-form{width:100%;display:flex;flex-direction:row;justify-content:space-between;align-items:end;gap:.75rem}.form-field{flex-grow:1}.form-field label{display:block;color:var(--text-muted);font-size:.875rem;margin-bottom:.25rem}.title-input{width:100%;border:1px solid var(--border-medium);border-radius:6px;padding:.65rem}.form-buttons{display:flex;gap:.5rem}.save-button,.cancel-button{border:none;border-radius:6px;padding:.5rem 1rem;font-size:.875rem;cursor:pointer;transition:background .2s ease;text-decoration:none}.save-button{background:var(--bg-button-primary);color:var(--text-button)}.save-button:hover{background:var(--bg-button-primary-hover)}.cancel-button{background:var(--bg-hover);color:var(--text-primary)}.cancel-button:hover{background:var(--bg-secondary)}.auth-container{min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--bg-secondary);padding:1rem}.auth-card{width:100%;max-width:420px;background:var(--bg-primary);border:1px solid var(--border-light);border-radius:12px;padding:2rem}.auth-card h1{font-size:1.75rem;font-weight:600;color:var(--text-primary);margin-bottom:.5rem;text-align:center}.auth-subtitle{color:var(--text-muted);font-size:.875rem;text-align:center;margin-bottom:2rem}.auth-form{display:flex;flex-direction:column;gap:1rem}.form-group{display:flex;flex-direction:column;gap:.5rem}.form-group label{font-size:.875rem;font-weight:500;color:var(--text-primary)}.form-group input{width:100%;padding:.75rem;border:1px solid var(--border-medium);border-radius:8px;font-size:.9rem;font-family:inherit;outline:none;transition:border-color .2s ease,box-shadow .2s ease}.form-group input:focus{border-color:var(--border-focus);box-shadow:0 0 0 3px var(--shadow-focus)}.form-group input::placeholder{color:var(--text-muted)}.btn-primary{width:100%;padding:.75rem;background:var(--bg-button-primary);color:var(--text-button);border:none;border-radius:8px;font-size:1rem;font-weight:500;cursor:pointer;transition:background .2s ease;margin-top:.5rem}.btn-primary:hover{background:var(--bg-button-primary-hover)}.btn-primary:disabled{background:var(--bg-button-disabled);cursor:not-allowed;opacity:.6}.error-message{background:#fee;color:#c00;padding:.75rem;border-radius:6px;border:1px solid #fcc;font-size:.875rem}.success-message{background:#efe;color:#070;padding:.75rem;border-radius:6px;border:1px solid #cfc;font-size:.875rem;margin-bottom:1rem}.auth-footer{text-align:center;color:var(--text-muted);font-size:.875rem;margin-top:1.5rem}.auth-footer a{color:var(--text-primary);font-weight:500;text-decoration:none}.auth-footer a:hover{text-decoration:underline}.auth-hint{margin-top:1.5rem;padding:1rem;background:var(--bg-secondary);border-radius:8px;font-size:.8rem;line-height:1.5}.auth-hint p{margin:0;color:var(--text-muted)}.auth-hint strong{color:var(--text-primary)}.auth-hint a{color:var(--text-primary);font-weight:500}