:root {
    --primary: #1a5f7a;
    --primary-dark: #0d4b63;
    --secondary: #f39c12;
    --secondary-dark: #e67e22;
    --light: #f5f5f5;
    --dark: #333;
    --gray: #777;
    --light-gray: #eee;
    --white: #fff;
    --black: rgba(0, 0, 0, 0.8);
    --font-main: 'Roboto', sans-serif;
    --font-heading: 'Montserrat', sans-serif;
  }

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

  .sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
  }

  body {
    font-family: var(--font-main);
    line-height: 1.6;
    color: var(--dark);
    background-color: var(--light);
  }

  .container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
  }

  h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--dark);
    margin-bottom: 1rem;
    line-height: 1.3;
  }

  h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
  }

  h2 {
    font-size: 2rem;
    position: relative;
    padding-bottom: 0.5rem;
    margin-bottom: 2rem;
  }

  h2:after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 60px;
    height: 3px;
    background-color: var(--secondary);
  }

  h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
  }

  p {
    margin-bottom: 1.5rem;
  }

  img {
    max-width: 100%;
    height: auto;
    display: block;
    border-radius: 5px;
  }

  .bg-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 0;
    opacity: 0.2;
  }

  .btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    background-color: var(--primary);
    color: var(--white);
    text-decoration: none;
    border-radius: 4px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-size: 0.9rem;
    border: none;
    cursor: pointer;
    transition: background-color 0.3s;
  }

  .btn:hover {
    background-color: var(--primary-dark);
  }

  .btn-primary {
    background-color: var(--secondary);
  }

  .btn-primary:hover {
    background-color: var(--secondary-dark);
  }

  /* Hero Section */
  .hero-section {
    position: relative;
    height: 60vh;
    min-height: 400px;
    display: flex;
    align-items: center;
    background-color: var(--black);
    overflow: hidden;
    color: var(--white);
  }

  .hero-section h1 {
    color: var(--white);
    font-size: 3.5rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    margin-bottom: 1rem;
  }

  .hero-subtitle {
    font-size: 1.2rem;
    max-width: 600px;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
    margin-bottom: 2rem;
  }

  /* Categories Section */
  .categories-section {
    padding: 5rem 0;
    background-color: var(--white);
  }

  .categories-grid {
    display: grid;
    grid-template-columns: repeat(1, 1fr);
    gap: 2rem;
  }

  @media (min-width: 768px) {
    .categories-grid {
      grid-template-columns: repeat(2, 1fr);
    }
  }

  @media (min-width: 1024px) {
    .categories-grid {
      grid-template-columns: repeat(4, 1fr);
    }
  }

  .category-card {
    background-color: var(--white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s, box-shadow 0.3s;
  }

  .category-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
  }

  .category-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 8px 8px 0 0;
  }

  .category-card h3, .category-card p, .category-card a {
    padding: 0 1.5rem;
  }

  .category-card h3 {
    margin-top: 1.5rem;
    color: var(--primary);
  }

  .category-card p {
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
  }

  .category-card .btn {
    margin: 0 1.5rem 1.5rem;
    display: inline-block;
  }

  /* Featured Section */
  .featured-section {
    padding: 5rem 0;
    position: relative;
    background-color: var(--black);
    color: var(--white);
  }

  .featured-content {
    max-width: 1000px;
    margin: 0 auto;
  }

  .featured-section h2 {
    color: var(--white);
    text-align: center;
  }

  .featured-section h2:after {
    left: 50%;
    transform: translateX(-50%);
  }

  .featured-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 3rem;
    font-size: 1.1rem;
  }

  .featured-product {
    display: flex;
    flex-direction: column;
    background-color: var(--white);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  }

  @media (min-width: 768px) {
    .featured-product {
      flex-direction: row;
    }
  }

  .featured-product img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    border-radius: 10px 10px 0 0;
  }

  @media (min-width: 768px) {
    .featured-product img {
      width: 40%;
      height: auto;
      border-radius: 10px 0 0 10px;
    }
  }

  .product-details {
    padding: 2rem;
    color: var(--dark);
  }

  .product-details h3 {
    color: var(--primary);
    font-size: 1.8rem;
    margin-bottom: 1rem;
  }

  .features-list {
    list-style: none;
    margin: 1.5rem 0;
  }

  .features-list li {
    margin-bottom: 0.7rem;
    display: flex;
    align-items: center;
  }

  .features-list i {
    color: var(--secondary);
    margin-right: 0.5rem;
  }

  .product-details a {
    color: var(--primary);
    text-decoration: underline;
  }

  /* Technology Section */
  .technology-section {
    padding: 5rem 0;
    background-color: var(--light);
  }

  .technology-section h2 {
    text-align: center;
  }

  .technology-section h2:after {
    left: 50%;
    transform: translateX(-50%);
  }

  .tech-grid {
    display: grid;
    grid-template-columns: repeat(1, 1fr);
    gap: 2rem;
    margin-top: 3rem;
  }

  @media (min-width: 768px) {
    .tech-grid {
      grid-template-columns: repeat(2, 1fr);
    }
  }

  @media (min-width: 1024px) {
    .tech-grid {
      grid-template-columns: repeat(4, 1fr);
    }
  }

  .tech-card {
    background-color: var(--white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    text-align: center;
    transition: transform 0.3s;
  }

  .tech-card:hover {
    transform: translateY(-5px);
  }

  .tech-card i {
    font-size: 2.5rem;
    color: var(--secondary);
    margin-bottom: 1.5rem;
  }

  .tech-card h3 {
    color: var(--primary);
    margin-bottom: 1rem;
  }

  .tech-card p {
    font-size: 0.95rem;
    margin-bottom: 0;
  }

  /* Testimonials Section */
  .testimonials-section {
    padding: 5rem 0;
    background-color: var(--white);
  }

  .testimonials-section h2 {
    text-align: center;
  }

  .testimonials-section h2:after {
    left: 50%;
    transform: translateX(-50%);
  }

  .testimonials-slider {
    margin-top: 3rem;
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
  }

  .testimonial {
    flex: 1 1 300px;
  }

  .testimonial-content {
    background-color: var(--light);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    position: relative;
  }

  .testimonial-content:after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 30px;
    width: 30px;
    height: 30px;
    background-color: var(--light);
    transform: rotate(45deg);
    z-index: -1;
  }

  .testimonial-content p {
    font-style: italic;
    margin-bottom: 0;
  }

  .testimonial-author {
    display: flex;
    align-items: center;
    margin-top: 2rem;
    padding-left: 1rem;
  }

  .testimonial-author img {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    object-fit: cover;
    margin-right: 1rem;
  }

  .testimonial-author h4 {
    margin-bottom: 0.2rem;
    font-size: 1.1rem;
  }

  .testimonial-author p {
    margin-bottom: 0;
    font-size: 0.9rem;
    color: var(--gray);
  }

  /* Contact Section */
  .contact-section {
    padding: 5rem 0;
    background-color: var(--light);
  }

  .contact-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 3rem;
  }

  .contact-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
  }

  @media (min-width: 768px) {
    .contact-container {
      flex-direction: row;
    }
  }

  .contact-form {
    flex: 1;
    background-color: var(--white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
  }

  .form-group {
    margin-bottom: 1.5rem;
  }

  .form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
  }

  .form-group input,
  .form-group select,
  .form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-family: inherit;
    font-size: 1rem;
  }

  .form-group textarea {
    resize: vertical;
  }

  .contact-info {
    flex: 1;
  }

  .contact-list {
    list-style: none;
    margin-bottom: 2rem;
  }

  .contact-list li {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
  }

  .contact-list i {
    width: 30px;
    height: 30px;
    background-color: var(--primary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 1rem;
  }

  .expert-advice {
    background-color: var(--white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
  }

  .expert-advice img {
    margin: 1rem 0;
    border-radius: 8px;
  }

  .expert-advice p {
    margin-bottom: 0;
  }

  @media (min-width: 768px) {
    h1 {
      font-size: 3rem;
    }

    h2 {
      font-size: 2.5rem;
    }

    h3 {
      font-size: 1.8rem;
    }
  }