:root{--chat-gradient: linear-gradient(135deg, #87CEEB 0%, #1E90FF 50%, #FFFFFF 100%);--chat-gradient-button: linear-gradient(135deg, #4A90E2 0%, #1E90FF 50%, #0066CC 100%);--chat-primary: #1E90FF;--chat-primary-dark: #0066CC;--chat-primary-light: #87CEEB;--chat-secondary: #6c757d;--chat-success: #22c55e;--chat-danger: #DC3545;--chat-white: #FFFFFF;--chat-black: #000000;--chat-gray-50: #F8FAFC;--chat-gray-100: #F0F2F5;--chat-gray-200: #E5E7EB;--chat-gray-300: #D1D5DB;--chat-gray-400: #9CA3AF;--chat-gray-500: #6B7280;--chat-gray-600: #4B5563;--chat-gray-700: #374151;--chat-gray-800: #1F2937;--chat-gray-900: #111827;--chat-shadow-sm: 0 2px 8px rgba(0, 0, 0, .08);--chat-shadow-md: 0 4px 15px rgba(0, 0, 0, .12);--chat-shadow-lg: 0 8px 24px rgba(0, 0, 0, .15);--chat-shadow-xl: 0 12px 40px rgba(0, 0, 0, .18);--chat-radius-sm: 8px;--chat-radius-md: 12px;--chat-radius-lg: 16px;--chat-radius-xl: 24px;--chat-radius-full: 9999px;--chat-transition: all .3s cubic-bezier(.4, 0, .2, 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