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typing-bounce{0%,60%,to{transform:translateY(0)}30%{transform:translateY(-8px)}}.typing-text{font-size:.875rem;color:var(--text-secondary);font-style:italic}.chat-input-form{padding:1rem 1.5rem;background:#fff;border-top:1px solid var(--border-color);display:flex;gap:.75rem}.attach-button{width:48px;height:48px;display:flex;align-items:center;justify-content:center;background:var(--bg-secondary);border:2px solid var(--border-color);border-radius:var(--radius-lg);font-size:1.25rem;cursor:pointer;transition:var(--transition)}.attach-button:hover:not(:disabled){background:var(--bg-tertiary);border-color:var(--primary-color);transform:translateY(-2px)}.attach-button:disabled{opacity:.5;cursor:not-allowed}.chat-input{flex:1;padding:.75rem 1rem;border:2px solid var(--border-color);border-radius:var(--radius-lg);font-size:.9375rem;font-family:inherit;resize:vertical;min-height:48px;max-height:150px;line-height:1.5;transition:var(--transition)}.chat-input:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px #667eea1a}.chat-input:disabled{background:var(--bg-secondary);cursor:not-allowed}.send-button{width:48px;height:48px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));color:#fff;border:none;border-radius:var(--radius-lg);font-size:1.25rem;cursor:pointer;transition:var(--transition)}.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}.send-icon{display:inline-block;transform:translate(1px)}.file-preview{padding:1rem 1.5rem;background:#fff;border-top:1px solid var(--border-color)}.file-preview-content{display:flex;align-items:center;gap:.75rem;padding:.75rem 1rem;background:var(--bg-secondary);border-radius:var(--radius-lg);border:2px solid var(--border-color)}.file-icon{font-size:1.5rem}.file-info{flex:1;display:flex;flex-direction:column;gap:.25rem;min-width:0}.file-name{font-size:.875rem;font-weight:600;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.file-size{font-size:.75rem;color:var(--text-secondary)}.upload-progress{display:flex;align-items:center;gap:.5rem;margin-top:.25rem}.progress-bar{flex:1;height:6px;background:#e0e0e0;border-radius:3px;overflow:hidden}.progress-fill{height:100%;background:linear-gradient(135deg,#667eea,#764ba2);border-radius:3px;transition:width .3s ease}.progress-text{font-size:.75rem;font-weight:600;color:#667eea;min-width:35px;text-align:right}.file-cancel,.file-send{padding:.5rem 1rem;font-size:.875rem;font-weight:600;border:none;border-radius:var(--radius-md);cursor:pointer;transition:var(--transition)}.file-cancel{background:var(--bg-tertiary);color:var(--text-primary)}.file-cancel:hover:not(:disabled){background:var(--border-color)}.file-send{background:var(--primary-color);color:#fff}.file-send:hover:not(:disabled){background:var(--primary-dark);transform:translateY(-2px);box-shadow:var(--shadow-sm)}.file-cancel:disabled,.file-send:disabled{opacity:.5;cursor:not-allowed}@media (max-width: 768px){.chat-interface{height:100vh}.chat-header{padding:1rem}.chat-users{font-size:.75rem}.user-badge{font-size:.75rem;padding:.125rem .5rem}}@media (max-width: 640px){.chat-input-form{padding:.75rem;gap:.5rem}.attach-button,.send-button{width:42px;height:42px;font-size:1.1rem}.file-preview{padding:.75rem}.file-preview-content{padding:.5rem}}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#0009;display:flex;align-items:center;justify-content:center;z-index:2000;padding:1rem;animation:fadeIn .2s ease-out}.modal-container{background:#fff;border-radius:var(--radius-xl);padding:2rem;max-width:400px;width:100%;box-shadow:var(--shadow-xl);text-align:center;animation:slideUp .3s ease-out}@keyframes slideUp{0%{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}.modal-icon{font-size:3rem;margin-bottom:1rem}.modal-title{font-size:1.5rem;font-weight:700;color:var(--text-primary);margin-bottom:1rem}.modal-message{font-size:1rem;color:var(--text-secondary);margin-bottom:1.5rem;line-height:1.6}.modal-close-button{width:100%;padding:.875rem 1.5rem;font-size:1rem;font-weight:600;background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));color:#fff;border:none;border-radius:var(--radius-md);cursor:pointer;transition:var(--transition)}.modal-close-button:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}.modal-close-button:active{transform:translateY(0)}.modal-container.error .modal-title{color:var(--error-color)}.modal-container.success .modal-title{color:var(--success-color)}.modal-container.warning .modal-title{color:var(--warning-color)}.modal-container.info .modal-title{color:var(--primary-color)}@media (max-width: 640px){.modal-container{padding:1.5rem}}.app{width:100%;min-height:100vh;display:flex;align-items:center;justify-content:center;padding:1rem}.app-container{width:100%;max-width:1200px;min-height:600px;background:var(--bg-primary);border-radius:var(--radius-xl);box-shadow:var(--shadow-xl);overflow:hidden;animation:slideUp .4s ease-out}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.loading-container{display:flex;align-items:center;justify-content:center;min-height:100vh}.loading-spinner{width:60px;height:60px;border:4px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@media (max-width: 768px){.app{padding:0}.app-container{min-height:100vh;border-radius:0}}*{margin:0;padding:0;box-sizing:border-box}:root{--primary-color: #6366f1;--primary-dark: #4f46e5;--primary-light: #818cf8;--secondary-color: #8b5cf6;--success-color: #10b981;--error-color: #ef4444;--warning-color: #f59e0b;--bg-primary: #ffffff;--bg-secondary: #f9fafb;--bg-tertiary: #f3f4f6;--text-primary: #111827;--text-secondary: #6b7280;--text-light: #9ca3af;--border-color: #e5e7eb;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .1);--radius-sm: .375rem;--radius-md: .5rem;--radius-lg: .75rem;--radius-xl: 1rem;--transition: all .3s ease}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:linear-gradient(135deg,#667eea,#764ba2);min-height:100vh;color:var(--text-primary)}#root{min-height:100vh;display:flex;align-items:center;justify-content:center}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:var(--bg-tertiary);border-radius:var(--radius-lg)}::-webkit-scrollbar-thumb{background:var(--primary-light);border-radius:var(--radius-lg)}::-webkit-scrollbar-thumb:hover{background:var(--primary-color)}