* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
	    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        body {
            line-height: 1.6;
            color: #333;
            background-color: #f9f9f9;
        }

        .container {
            width: 90%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 5px;
        }

        section {
            padding: 80px 0;
        }

        h1, h2, h3, h4 {
            margin-bottom: 20px;
            color: #2c3e50;
            font-weight: 600;
        }

        p {
            margin-bottom: 15px;
        }

        .btn {
            display: inline-block;
            background: #3498db;
            color: white;
            padding: 12px 30px;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            text-decoration: none;
            font-size: 16px;
            font-weight: 600;
            transition: all 0.3s ease;
        }

        .btn:hover {
            background: #efbf04;
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        }

        /* Header Styles */
        header {
            background: white;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            position: fixed;
            width: 100%;
            top: 0;
            z-index: 1000;
        }

       .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }

        .logo {
            width: 115px;
            height: 90px;
            text-decoration: none;
        }

        nav ul {
            display: flex;
            list-style: none;
        }

        nav ul li {
            margin-left: 30px;
        }

        nav ul li a {
            text-decoration: none;
            color: #2c3e50;
            font-weight: 500;
            transition: color 0.3s;
        }

        nav ul li a:hover {
            color: #efbf04;
        }

        /* Hero Section */
	 .hero {
            width: 100%;
            height: 40vw;     
            background: url('../images/tvti-nam_hero.png') center center /cover no-repeat;
            color: white;
            padding: 150px 0 100px;
            text-align: center;
        }
        
        .hero h1 {
	    font-family: 'Acherus Grotesque Italic', sans-serif;
            font-size: 48px;
            margin-bottom: 20px;
	    margin-top: 7rem;
            color: white;
            line-height: 1.5;
	    display: inline-block;
  	    min-height: 3.0em;
  	    overflow: hidden;
        }
        
	 .hero h2 {
            color: white;
            margin-top: 5rem;
	    max-width: 700px;
            margin: 0 auto 30px;
	    
        }

        .hero-button {
            display: inline-block;
            background-color: #efbf04;
            color: #0c4a6e;
            font-size: 20px;
            font-weight: bold;
            padding: 12px 24px;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            margin-top: 30px;
            text-decoration: none;
            transition: background-color 0.3s;
        }
        
        .hero-button:hover {
            background-color: #efbf04;
        }
        
 
       .about {
	    background: white;
	    margin-top: 5px;
	}

	.section-title {
	    margin-bottom: 30px;
	}
 
	.about p {
	    align-text: left;
	    font-size: 18px;
	}

        /* Services Section */
        .services {
            background: white;
	    margin-top: 5px;
        }

        .section-title {
            text-align: center;
            margin-bottom: 30px;
        }

        .section-title h2 {
            font-size: 36px;
            position: relative;
            display: inline-block;
            padding-bottom: 15px;
        }

        .section-title h2:after {
            content: '';
            position: absolute;
            width: 500px;
            height: 3px;
            background: #FFD700;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
        }

	.services-section-title p {
	   text-align: center;
	}

	.services h3 {
	    color: blue;
	}

	.services h4 {
	   text-align: left;
	}

	.services  li, i {
	   text-align: left;
	}

        .services-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }

        .service-card {
            background: #f8f9fa;
            border-radius: 8px;
            padding: 30px;
            text-align: center;
            transition: transform 0.3s, box-shadow 0.3s;
        }

        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }

        .service-image img {
            width: 90%;
            height: auto;
            margin-bottom: 20px;
        }

	.service-tag {
            display: inline-block;
	    line-height: 36px;
	}

	.service-tag img {
	    border: 1px solid #ddd;
	    padding: 5px;
	    width: 45px;
	}

	.service-list li {
            align-items: left;
	    list-style-type: none;
	}

	.service-icon i {
           color: #22c55e;
           margin-right: 0.5rem;
	}

        /* Product Section */
        .product {
            background: #f8f9fa;
        }

        .product-content {
            display: flex;
            align-items: center;
            gap: 50px;
        }

      .product-text {
            flex: 1;
        }

        .product-image {
            flex: 1;
            text-align: center;
        }

        .product-image img {
            max-width: 100%;
            border-radius: 8px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }

        .features-list {
            list-style: none;
            margin: 20px 0;
        }

        .features-list li {
            margin-bottom: 10px;
            padding-left: 30px;
            position: relative;
        }

        .features-list li:before {
            content: '✓';
            position: absolute;
            left: 0;
            color: #27ae60;
            font-weight: bold;
        }

     /* Contact Section */
        .contact {
            background: white;
        }

        .contact-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 50px;
        }

	 .contact-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2px;
        }

	 .contact-card {
            background: #f8f9fa;
            border-radius: 8px;
            padding: 30px;
            transition: transform 0.3s, box-shadow 0.3s;
        }

        .contact-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }

	.contact-image {
	   display: grid;
	   place-items: center;
	   margin-bottom: 30px;
	}
	
	.contact-image img {
	   padding: 6px;
	   border: 3px solid #FFD700;
 	   background: transparent;
	   width: 50%;
	   justify-items: center;
	}

	.contact-avsa {
	   display: inline-block;
	   place-items: left;
	   margin-top: 10px;
	   margin-bottom: 10px;
	}

	.contact-avsa img {
	   width: 170px;
	   height: auto;
	}

        .contact-info h2 {
	    line-height: 0.5rem;
        }

	.contact-info h3 {
	   margin-top: 0px; 
	   line-height: 0.5rem;
	}

        .contact-details {
	    margin-top: 2rem;
            margin-bottom: 30px;
	  }

        .contact-details p {
            margin-bottom: 10px;
            display: flex;
        }

        .contact-details i {
            margin-right: 10px;
            color: #3498db;
        }

       .contact-form .form-group {
            margin-bottom: 20px;
	    align-items: center;
	    text-align: center;
        }

        .contact-form label {
            display: block;
            margin-bottom: 5px;
            font-weight: 500;
        }

        .contact-form input,
        .contact-form textarea {
            width: 100%;
            padding: 12px;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-size: 16px;
        }

        .contact-form textarea {
            height: 150px;
            resize: vertical;
        }

	.alert {
	    padding: 15px;
   	    margin-bottom: 20px;
	    margin-top: 20px;
  	    border-radius: 4px;
	    font-weight: 600;
    	}
    
	.alert.success {
	    background-color: #d4edda;
	    color: #155724;
	}
    
	.alert.error {
	   background-color: #f8d7da;
           color: #721c24;
       }

	 .submit-btn {
	  display: inline-block;
          background: green;
	  color: white;
          padding: 12px 25px;
          border-radius: 5px;
          text-decoration: none;
          font-weight: 600;
          transition: background 0.3s;
	  margin-bottom: 10px;
      }

	.submit-btn:hover {
   	 background: yellow;
    } 


        /* Certifications Section */
        .certifications {
            background: #f8f9fa;
            text-align: center;
        }

        .cert-logo {
            background: #f8f9fa;
            height: 100px;
            display: inline-block;
            align-items: center;
            justify-content: center;
        }

        .cert-logo img {
            max-width: 100%;
            max-height: 80px;
        }
	
	.cert-text h3 {
	   font-family: 'Times New Roman', sans-serif;
	   font-size: 1.0rem;
	   line-height: 0.5rem;
	}

	.cert-text p {
	  font-size: 0.8rem;
	  line-height: 0.5rem;
	}

        /* Footer */
        footer {
            background: #2c3e50;
            color: white;
            padding: 40px 0;
            text-align: center;
        }

        .footer-content {
            display: flex;
            flex-direction: column;
            align-items: center;
        }

    .footer-logo {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 20px;
        }

        .footer-links {
            display: flex;
            list-style: none;
            margin-bottom: 20px;
	    color: white;
        }

        .footer-links li {
            margin: 0 15px;
        }

        .footer-links a {
            color: white;
            text-decoration: none;
            transition: color 0.3s;
        }

        .footer-links a:hover {
            color: #3498db;
        }

	 .copyright {
            margin-top: 20px;
            font-size: 14px;
            opacity: 0.8;
	    color: white;
        }

	.terms a {
	    text-color: white;
	}

	 /* Pop-up Modal Styles */
        .modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.7);
            z-index: 2000;
            overflow: auto;
            opacity: 0;
            transition: opacity 0.3s ease;
        }
        
        .modal.active {
            display: flex;
            justify-content: center;
            align-items: center;
            opacity: 1;
        }
	
	.modal-image {
	    display: grid;
	    place-items: center;
	    justify-items: center;
	    margin-bottom: 20px;
	}

	.modal-image img {
	    max-width: 100%;
	    max-height: 400px;
	}
        
        .modal-content {
            background-color: white;
            width: 90%;
            max-width: 800px;
            border-radius: 10px;
            box-shadow: 0 5px 30px rgba(0, 0, 0, 0.3);
            transform: translateY(-50px);
            transition: transform 0.3s ease;
            max-height: 90vh;
            overflow-y: auto;
	 }
        
        .modal.active .modal-content {
            transform: translateY(0);
        }
        
        .modal-header {
            padding: 20px 30px;
            border-bottom: 1px solid #eee;
            display: flex;
            justify-content: space-between;
            align-items: center;
	}
        
        .modal-header h2 {
            margin: 0;
            color: #2c3e50;
        }
        
        .close-modal {
            background: none;
            border: none;
            font-size: 24px;
            cursor: pointer;
            color: #7f8c8d;
            transition: color 0.3s;
        }
        
        .close-modal:hover {
            color: #e74c3c;
        }
        
        .modal-body {
            padding: 30px;
        }
        
        .modal-section {
            margin-bottom: 30px;
        }
        
        .modal-section h3 {
            color: #3498db;
            border-bottom: 2px solid #3498db;
            padding-bottom: 10px;
            margin-bottom: 15px;
        }
        
        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
        }
        
        .comparison-table th, .comparison-table td {
            padding: 12px 15px;
            text-align: left;
            border-bottom: 1px solid #ddd;
        }
        
        .comparison-table th {
            background-color: #f8f9fa;
            font-weight: 600;
        }
        
        .comparison-table tr:hover {
            background-color: #f5f5f5;
        }
        
        .avsa-benefit {
            background-color: #e8f4fd;
            border-left: 4px solid #3498db;
            padding: 15px;
            margin: 15px 0;
        }
        
        /* Responsive Design */
        @media (max-width: 768px) {
	    html, body  {
		width: 100%;
		overflow-x: hidden;
		font-size: 15px;
		line-height: 1.5;
	    }

            .header-container {
                display: flex;
		flex-direction: column;
		align-items: center;
		justify-content: center;
		margin: 0;
            }

	    .header-container a {
		margin: 5px 0;
	    }
            
            nav ul {
                margin-top: 15px;
            }
            
            nav ul li {
                margin: 0 10px;
            }
            
	    .hero {
		display: flex;
		align-items: center;
		justify-content: center;
		background-attachment: scroll;
		background-size: cover;
		min-height: 80vh;
		padding: 2rem 1rem;
		background-position: center;
		overflow: hidden;
            }

            .hero h1 {
                font-size: 36px;
            }
         
	    .section-title {
   		 font-size: 1.2rem;
   		 white-space: normal;
  	    }
   
            .product-content {
                flex-direction: column;
            }
            
            .footer-links {
                flex-direction: column;
            }
            
            .footer-links li {
                margin: 5px 0;
            }
            
            .modal-content {
                width: 95%;
                margin: 20px auto;
            }
            
            .comparison-table {
                display: block;
                overflow-x: auto;
            }
        }