margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: #333;
            background-color: #f8f9fa;
        }

        /* Header */
        .header {
            background-color: #fff;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
        }

        .header-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 70px;
        }

        .logo {
            font-size: 24px;
            font-weight: bold;
            color: #ff6b35;
        }

        .nav {
            display: flex;
            list-style: none;
            gap: 30px;
        }

        .nav a {
            text-decoration: none;
            color: #333;
            font-weight: 500;
            transition: color 0.3s ease;
        }

        .nav a:hover {
            color: #ff6b35;
        }

        /* Main Content */
        .main-content {
            margin-top: 70px;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Hero Section */
        .hero {
            background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
            padding: 80px 0;
            min-height: 600px;
            display: flex;
            align-items: center;
        }

        .hero-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }

        .hero-text h1 {
            font-size: 48px;
            font-weight: bold;
            color: #333;
            margin-bottom: 20px;
            line-height: 1.2;
        }

        .hero-text h1 .highlight {
            color: #ff6b35;
        }

        .hero-text p {
            font-size: 18px;
            color: #666;
            margin-bottom: 30px;
            line-height: 1.6;
        }

        .cta-button {
            display: inline-flex;
            align-items: center;
            background-color: #ff6b35;
            color: white;
            padding: 15px 30px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: bold;
            font-size: 16px;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(255, 107, 53, 0.3);
        }

        .cta-button:hover {
            background-color: #e55a2b;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(255, 107, 53, 0.4);
        }

        .cta-button::before {
            content: "💬";
            margin-right: 10px;
        }

        .phone-number {
            display: flex;
            align-items: center;
            margin-top: 20px;
            color: #666;
            font-size: 14px;
        }

        .phone-number::before {
            content: "📞";
            margin-right: 8px;
        }

        .hero-image {
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .phone-mockup {
            background-color: #ff6b35;
            border-radius: 30px;
            padding: 20px;
            box-shadow: 0 20px 40px rgba(255, 107, 53, 0.3);
            transform: rotate(-5deg);
        }

        .phone-screen {
            background-color: white;
            border-radius: 20px;
            padding: 20px;
            width: 300px;
            height: 500px;
            overflow: hidden;
        }

        .chat-header {
            display: flex;
            align-items: center;
            padding-bottom: 15px;
            border-bottom: 1px solid #eee;
            margin-bottom: 20px;
        }

        .chat-avatar {
            width: 40px;
            height: 40px;
            background-color: #ff6b35;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: bold;
            margin-right: 10px;
        }

        .chat-name {
            font-weight: bold;
            color: #333;
        }

        .chat-message {
            background-color: #f1f3f4;
            padding: 12px 16px;
            border-radius: 18px;
            margin-bottom: 10px;
            font-size: 14px;
            line-height: 1.4;
        }

        .chat-message.user {
            background-color: #ff6b35;
            color: white;
            margin-left: 50px;
            text-align: right;
        }

        .interface-label {
            text-align: center;
            background-color: #ff6b35;
            color: white;
            padding: 10px;
            border-radius: 0 0 20px 20px;
            font-weight: bold;
            margin-top: 20px;
        }

        /* Features Section */
        .features {
            padding: 80px 0;
            background-color: white;
        }

        .features-header {
            text-align: center;
            margin-bottom: 60px;
        }

        .features-header h2 {
            font-size: 36px;
            font-weight: bold;
            color: #333;
            margin-bottom: 15px;
        }

        .features-header p {
            font-size: 18px;
            color: #666;
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 40px;
        }

        .feature-card {
            text-align: center;
            padding: 30px 20px;
        }

        .feature-icon {
            width: 80px;
            height: 80px;
            background-color: #ff6b35;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-size: 32px;
        }

        .feature-card h3 {
            font-size: 24px;
            font-weight: bold;
            color: #333;
            margin-bottom: 15px;
        }

        .feature-card p {
            color: #666;
            line-height: 1.6;
        }

        /* Contact Section */
        .contact {
            padding: 80px 0;
            background-color: #f8f9fa;
        }

        .contact-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
        }

        .contact-info h2 {
            font-size: 36px;
            font-weight: bold;
            color: #333;
            margin-bottom: 20px;
        }

        .contact-info p {
            color: #666;
            margin-bottom: 30px;
            font-size: 16px;
        }

        .contact-item {
            display: flex;
            align-items: center;
            margin-bottom: 20px;
        }

        .contact-icon {
            width: 50px;
            height: 50px;
            background-color: #ff6b35;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 15px;
            color: white;
            font-size: 18px;
        }

        .contact-details h4 {
            font-weight: bold;
            color: #333;
            margin-bottom: 5px;
        }

        .contact-details p {
            color: #ff6b35;
            margin: 0;
        }

        .contact-form {
            background-color: white;
            padding: 40px;
            border-radius: 10px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
        }

        .contact-form h3 {
            color: #ff6b35;
            font-size: 24px;
            margin-bottom: 20px;
            text-align: center;
        }

        .form-group {
            margin-bottom: 20px;
        }

        .form-group label {
            display: block;
            margin-bottom: 5px;
            color: #333;
            font-weight: 500;
        }

        .form-group input,
        .form-group textarea {
            width: 100%;
            padding: 12px 15px;
            border: 2px solid #e9ecef;
            border-radius: 8px;
            font-size: 14px;
            transition: border-color 0.3s ease;
        }

        .form-group input:focus,
        .form-group textarea:focus {
            outline: none;
            border-color: #ff6b35;
        }

        .form-group textarea {
            height: 120px;
            resize: vertical;
        }

        .submit-button {
            width: 100%;
            background-color: #ff6b35;
            color: white;
            padding: 15px;
            border: none;
            border-radius: 8px;
            font-size: 16px;
            font-weight: bold;
            cursor: pointer;
            transition: background-color 0.3s ease;
        }

        .submit-button:hover {
            background-color: #e55a2b;
        }

        /* Login Section */
        .login-section {
            padding: 80px 0;
            background-color: white;
        }

        .login-container {
            max-width: 400px;
            margin: 0 auto;
            background-color: #f8f9fa;
            padding: 40px;
            border-radius: 10px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
        }

        .login-container h2 {
            text-align: center;
            color: #333;
            margin-bottom: 30px;
            font-size: 28px;
        }

        /* Footer */
        .footer {
            background-color: #333;
            color: white;
            padding: 60px 0 30px;
        }

        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-section h3 {
            color: #ff6b35;
            margin-bottom: 20px;
            font-size: 20px;
        }

        .footer-section p,
        .footer-section a {
            color: #ccc;
            text-decoration: none;
            line-height: 1.8;
        }

        .footer-section a:hover {
            color: #ff6b35;
        }

        .footer-bottom {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid #555;
            color: #999;
        }

        .social-icons {
            display: flex;
            gap: 15px;
            margin-top: 20px;
        }

        .social-icon {
            width: 40px;
            height: 40px;
            background-color: #ff6b35;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            text-decoration: none;
            transition: background-color 0.3s ease;
        }

        .social-icon:hover {
            background-color: #e55a2b;
        }

        /* Messages */
        .success-message {
            background-color: #d4edda;
            color: #155724;
            padding: 12px 20px;
            border-radius: 8px;
            margin-bottom: 20px;
            border: 1px solid #c3e6cb;
        }

        .error-message {
            background-color: #f8d7da;
            color: #721c24;
            padding: 12px 20px;
            border-radius: 8px;
            margin-bottom: 20px;
            border: 1px solid #f5c6cb;
        }

        .console-output {
            background-color: #f1f1f1;
            color: #333;
            padding: 12px 20px;
            border-radius: 8px;
            margin-bottom: 20px;
            font-family: monospace;
            white-space: pre-wrap;
            border: 1px solid #ddd;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .hero-content {
                grid-template-columns: 1fr;
                text-align: center;
            }

            .hero-text h1 {
                font-size: 36px;
            }

            .contact-content {
                grid-template-columns: 1fr;
            }

            .nav {
                display: none;
            }

            .phone-mockup {
                transform: none;
            }

            .phone-screen {
                width: 250px;
                height: 400px;
            }
        }