.message{margin-bottom:1rem;animation:fadeIn .3s ease-in}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.message-user{display:flex;flex-direction:column;align-items:flex-end}.message-assistant{display:flex;flex-direction:column;align-items:flex-start}.message-content{max-width:70%;padding:.875rem 1.125rem;border-radius:var(--radius-md);word-wrap:break-word;line-height:1.5}.message-user .message-content{background:var(--primary-gradient);color:#fff;border-bottom-right-radius:4px}.message-assistant .message-content{background:#fff;color:var(--text-primary);border:1px solid var(--border-color);border-bottom-left-radius:4px}.message-time{font-size:.75rem;color:var(--text-light);margin-top:.25rem;padding:0 .5rem}.message-loading .message-content{padding:1rem 1.5rem}@media (max-width: 768px){.message-content{max-width:85%}}.message-list{flex:1;overflow-y:auto;padding:1.5rem;display:flex;flex-direction:column}.empty-state{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:2rem;color:var(--text-secondary)}.empty-state h2{color:var(--text-primary);margin-bottom:.5rem}.empty-state p{margin-bottom:.5rem}.empty-state-hint{font-size:.875rem;font-style:italic}.typing-indicator{display:flex;gap:4px;align-items:center}.typing-indicator span{width:8px;height:8px;border-radius:50%;background:var(--text-light);animation:typing 1.4s infinite}.typing-indicator span:nth-child(2){animation-delay:.2s}.typing-indicator span:nth-child(3){animation-delay:.4s}@keyframes typing{0%,60%,to{transform:translateY(0);opacity:.7}30%{transform:translateY(-10px);opacity:1}}.message-input-form{display:flex;gap:.75rem;align-items:flex-end;flex:1}.message-input{flex:1;min-width:0;padding:.875rem 1rem;border:2px solid var(--border-color);border-radius:var(--radius-md);font-size:1rem;font-family:inherit;resize:none;min-height:52px;max-height:150px;transition:var(--transition);line-height:1.5}.message-input:focus{outline:none;border-color:#007aff;box-shadow:0 0 0 3px #007aff1a}.message-input:disabled{background:var(--bg-secondary);cursor:not-allowed;opacity:.6}.send-button{padding:.875rem 1rem;background:var(--primary-gradient);color:#fff;border:none;border-radius:var(--radius-md);font-size:1rem;font-weight:600;cursor:pointer;transition:var(--transition);display:flex;align-items:center;justify-content:center;min-width:52px;height:52px;flex-shrink:0}.send-button:hover:not(:disabled){transform:translateY(-2px);box-shadow:var(--shadow-md)}.send-button:active:not(:disabled){transform:translateY(0)}.send-button:disabled{opacity:.5;cursor:not-allowed}@media (max-width: 768px){.message-input-form{gap:.5rem}.message-input{padding:.75rem;font-size:.875rem}.send-button{padding:.75rem 1rem;min-width:48px;height:48px}}.chat-container{display:flex;flex-direction:column;height:100%;background:#fff;border-radius:var(--radius-lg);box-shadow:var(--shadow-md);overflow:hidden}.error-banner{background:#fff3cd;border:1px solid #ffc107;color:#856404;padding:.875rem 1.5rem;display:flex;justify-content:space-between;align-items:center}.error-banner button{background:none;border:none;font-size:1.5rem;cursor:pointer;color:inherit;padding:0 .5rem;line-height:1}.chat-footer{background:#fff;padding:1.25rem 2rem;border-top:1px solid var(--border-color);display:flex;gap:1rem;align-items:flex-end}.clear-button{padding:.875rem 1rem;background:#fff;color:#f5576c;border:2px solid #f5576c;border-radius:var(--radius-md);font-size:.875rem;font-weight:600;cursor:pointer;transition:var(--transition);white-space:nowrap;height:52px;flex-shrink:0}.clear-button:hover{background:#f5576c;color:#fff}@media (max-width: 768px){.chat-footer{padding:1rem;flex-direction:column;align-items:stretch}.clear-button{width:100%;height:48px}}.app{min-height:100vh;display:flex;flex-direction:column;background:var(--bg-secondary)}.app-header{background:#fff;padding:1.5rem 2rem;box-shadow:var(--shadow-sm);text-align:center;border-bottom:1px solid var(--border-color)}.app-title{font-size:1.75rem;margin-bottom:.25rem;background:var(--primary-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.app-subtitle{font-size:.875rem;color:var(--text-secondary)}.app-main{flex:1;display:flex;flex-direction:column;max-width:1200px;width:100%;margin:0 auto;padding:2rem}.app-footer{background:#fff;padding:1rem 2rem;text-align:center;color:var(--text-secondary);font-size:.875rem;border-top:1px solid var(--border-color)}@media (max-width: 768px){.app-header{padding:1rem}.app-title{font-size:1.5rem}.app-main{padding:1rem}.app-footer{padding:1rem;font-size:.8125rem}}:root{--primary-gradient: linear-gradient(135deg, #007AFF 0%, #0051D5 100%);--secondary-gradient: linear-gradient(135deg, #34C759 0%, #30D158 100%);--success-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);--bg-primary: #ffffff;--bg-secondary: #f8f9fa;--bg-tertiary: #e9ecef;--text-primary: #212529;--text-secondary: #6c757d;--text-light: #adb5bd;--border-color: #dee2e6;--shadow-sm: 0 2px 4px rgba(0, 0, 0, .1);--shadow-md: 0 4px 12px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 30px rgba(0, 0, 0, .15);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--transition: all .3s ease}*{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;background:var(--bg-secondary);color:var(--text-primary);line-height:1.6}code{font-family:source-code-pro,Menlo,Monaco,Consolas,Courier New,monospace}#root{min-height:100vh;display:flex;flex-direction:column}.gradient-text{background:var(--primary-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}::-webkit-scrollbar{width:10px;height:10px}::-webkit-scrollbar-track{background:var(--bg-secondary)}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:5px}::-webkit-scrollbar-thumb:hover{background:var(--text-light)}