*{margin:0;padding:0;box-sizing:border-box}:root{--primary-color: #3b82f6;--primary-dark: #2563eb;--success-color: #10b981;--warning-color: #f59e0b;--error-color: #ef4444;--bg-color: #f9fafb;--card-bg: #ffffff;--text-primary: #111827;--text-secondary: #6b7280;--border-color: #e5e7eb;--shadow: 0 1px 3px 0 rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1)}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-color:var(--bg-color);color:var(--text-primary)}.app{min-height:100vh}.header{background:linear-gradient(135deg,var(--primary-color) 0%,var(--primary-dark) 100%);color:#fff;padding:2rem;box-shadow:var(--shadow-lg)}.header h1{font-size:2rem;font-weight:700;margin-bottom:.5rem}.header p{font-size:1rem;opacity:.9}.container{max-width:1200px;margin:0 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slideIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.message.user{justify-content:flex-end}.message-content{display:flex;gap:12px;max-width:70%}.message.user .message-content{flex-direction:row-reverse}.message-avatar{font-size:32px;line-height:1;flex-shrink:0}.message-bubble{background:#fff;padding:12px 16px;border-radius:18px;box-shadow:0 1px 2px #0000001a}.message.user .message-bubble{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.message-text{font-size:15px;line-height:1.6;word-wrap:break-word}.message-text strong{font-weight:700}.message.user .message-text strong{color:#fffffff2}.message-text div{margin-bottom:.5rem}.message-text div:last-child{margin-bottom:0}.message-time{font-size:11px;opacity:.6;margin-top:4px;text-align:right}.message.bot .message-bubble.typing{padding:16px 20px}.typing-indicator{display:flex;gap:4px}.typing-indicator span{width:8px;height:8px;background:#667eea;border-radius:50%;animation:bounce 1.4s infinite 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