:root {
            --primary-color: #667eea;
            --secondary-color: #764ba2;
            --success-color: #28a745;
            --dark-color: #2c3e50;
            --light-color: #f8f9fa;
            --border-color: #e9ecef;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
            min-height: 100vh;
            padding: 20px 0;
        }

        .chatbot-container {
            max-width: 800px;
            margin: 0 auto;
            background: white;
            border-radius: 20px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
            overflow: hidden;
            height: 600px;
            display: flex;
            flex-direction: column;
        }

        .chatbot-header {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            padding: 20px;
            text-align: center;
            position: relative;
        }

        .chatbot-header::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 20"><defs><radialGradient id="a" cx="50%" cy="0%" r="100%"><stop offset="0%" stop-color="white" stop-opacity=".1"/><stop offset="100%" stop-color="white" stop-opacity="0"/></radialGradient></defs><rect width="100" height="10" fill="url(%23a)"/></svg>');
        }

        .chatbot-title {
            font-size: 1.8rem;
            font-weight: 600;
            margin: 0;
            position: relative;
            z-index: 1;
        }

        .status-indicator {
            display: inline-block;
            width: 10px;
            height: 10px;
            background: var(--success-color);
            border-radius: 50%;
            margin-left: 10px;
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0% { opacity: 1; }
            50% { opacity: 0.5; }
            100% { opacity: 1; }
        }

        .chat-messages {
            flex: 1;
            padding: 20px;
            overflow-y: auto;
            background: #fafbfc;
            scrollbar-width: thin;
            scrollbar-color: var(--border-color) transparent;
        }

        .chat-messages::-webkit-scrollbar {
            width: 6px;
        }

        .chat-messages::-webkit-scrollbar-track {
            background: transparent;
        }

        .chat-messages::-webkit-scrollbar-thumb {
            background: var(--border-color);
            border-radius: 10px;
        }

        .message {
            display: flex;
            margin-bottom: 20px;
            animation: fadeInUp 0.3s ease-out;
        }

        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(10px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .message.user {
            justify-content: flex-end;
        }

        .message-content {
            max-width: 70%;
            padding: 15px 20px;
            border-radius: 20px;
            position: relative;
            word-wrap: break-word;
        }

        .message.user .message-content {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            border-bottom-right-radius: 5px;
        }

        .message.bot .message-content {
            background: white;
            color: var(--dark-color);
            border: 1px solid var(--border-color);
            border-bottom-left-radius: 5px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
        }

        .message-avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 12px;
            font-size: 1.2rem;
        }

        .message.user .message-avatar {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            order: 2;
        }

        .message.bot .message-avatar {
            background: var(--success-color);
            color: white;
        }

        .chat-input-container {
            padding: 20px;
            background: white;
            border-top: 1px solid var(--border-color);
        }

        .input-group {
            background: var(--light-color);
            border-radius: 25px;
            overflow: hidden;
            border: 2px solid transparent;
            transition: all 0.3s ease;
        }

        .input-group:focus-within {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
        }

        .form-control {
            border: none;
            background: transparent;
            padding: 15px 20px;
            font-size: 1rem;
            resize: none;
            min-height: 50px;
        }

        .form-control:focus {
            box-shadow: none;
            background: transparent;
        }

        .btn-send {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            border: none;
            color: white;
            padding: 15px 25px;
            border-radius: 0;
            transition: all 0.3s ease;
            font-weight: 600;
        }

        .btn-send:hover {
            background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
            color: white;
            transform: translateY(-1px);
        }

        .btn-send:disabled {
            opacity: 0.6;
            transform: none;
        }

        .typing-indicator {
            display: none;
            padding: 15px 20px;
            background: white;
            border: 1px solid var(--border-color);
            border-radius: 20px;
            border-bottom-left-radius: 5px;
            max-width: 70%;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
        }

        .typing-dots {
            display: flex;
            gap: 4px;
        }

        .typing-dot {
            width: 8px;
            height: 8px;
            background: var(--primary-color);
            border-radius: 50%;
            animation: typing 1.4s infinite ease-in-out;
        }

        .typing-dot:nth-child(2) {
            animation-delay: 0.2s;
        }

        .typing-dot:nth-child(3) {
            animation-delay: 0.4s;
        }

        @keyframes typing {
            0%, 60%, 100% {
                transform: translateY(0);
                opacity: 0.4;
            }
            30% {
                transform: translateY(-10px);
                opacity: 1;
            }
        }

        @keyframes blink {
            0%, 50% { opacity: 1; }
            51%, 100% { opacity: 0; }
        }

        @media (max-width: 768px) {
            .chatbot-container {
                height: 100vh;
                border-radius: 0;
                margin: 0;
            }
            
            .message-content {
                max-width: 85%;
            }
            
            .chatbot-title {
                font-size: 1.5rem;
            }
        }

        .icon img {
            width: 45px;
        }

        .chat-icon {
            width: 35px;
        }