*{margin:0;padding:0;box-sizing:border-box}:root{--primary-color: #4a90e2;--secondary-color: #50c878;--success-color: #28a745;--danger-color: #dc3545;--warning-color: #ffc107;--dark-color: #333;--light-color: #f8f9fa;--gray-color: #6c757d;--border-color: #dee2e6;--shadow: 0 2px 10px rgba(0, 0, 0, .1);--shadow-lg: 0 4px 20px rgba(0, 0, 0, .15);--border-radius: 8px;--border-radius-lg: 12px}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;line-height:1.6;color:var(--dark-color);background:linear-gradient(135deg,#667eea,#764ba2);min-height:100vh;padding:20px 0}.container{max-width:800px;margin:0 auto;padding:0 20px}.header{text-align:center;margin-bottom:40px;color:#fff}.title{font-size:2.5rem;font-weight:700;margin-bottom:10px;text-shadow:2px 2px 4px 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