:root {
    --primary: #1e5f74;
    --primary-dark: #0d3b49;
    --secondary: #f39c12;
    --secondary-dark: #e67e22;
    --text: #333333;
    --text-light: #666666;
    --text-white: #ffffff;
    --bg-light: #f5f8fa;
    --bg-dark: #2c3e50;
    --border: #e0e0e0;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    --border-radius: 6px;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-large: 0 10px 30px rgba(0, 0, 0, 0.15);
  }

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

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

  .container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
  }

  section {
    position: relative;
    padding: var(--spacing-lg) 0;
  }

  .bg-image {
    position: absolute;
    z-index: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.1;
    top: 0;
    left: 0;
  }

  h1, h2, h3, h4, h5, h6 {
    color: var(--text);
    margin-bottom: var(--spacing-md);
    font-weight: 700;
    line-height: 1.2;
  }

  h1 {
    font-size: 2.5rem;
    color: var(--text-white);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
  }

  h2 {
    font-size: 2rem;
    position: relative;
    padding-bottom: var(--spacing-sm);
  }

  h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 80px;
    height: 3px;
    background-color: var(--secondary);
  }

  h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
  }

  p {
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
  }

  img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
  }

  .btn-primary, .btn-secondary {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    text-decoration: none;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    font-size: 1rem;
  }

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

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

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

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

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

  .hero-section .bg-image {
    opacity: 0.3;
  }

  .hero-section .container {
    position: relative;
    z-index: 1;
  }

  .hero-text {
    color: var(--text-white);
    font-size: 1.25rem;
    max-width: 800px;
    margin: 0 auto;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  }

  /* Intro Section */
  .intro-section .container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
  }

  .intro-content {
    flex: 1;
  }

  .intro-section img {
    flex: 1;
    max-height: 400px;
    object-fit: cover;
  }

  /* Categories Section */
  .categories-section {
    background-color: var(--bg-light);
  }

  .categories-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .category-card {
    background-color: white;
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
  }

  .category-card img {
    height: 200px;
    object-fit: cover;
    margin-bottom: var(--spacing-md);
  }

  .category-card h3 {
    color: var(--primary);
  }

  .category-card p {
    flex-grow: 1;
    margin-bottom: var(--spacing-md);
  }

  /* Featured Section */
  .featured-section {
    background-color: var(--primary);
    color: var(--text-white);
  }

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

  .featured-section h2::after {
    background-color: var(--text-white);
  }

  .featured-products {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .product-card {
    background-color: white;
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    box-shadow: var(--shadow);
    position: relative;
    display: flex;
    flex-direction: column;
  }

  .product-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background-color: var(--secondary);
    color: white;
    padding: 0.3rem 0.6rem;
    border-radius: var(--border-radius);
    font-size: 0.8rem;
    font-weight: bold;
  }

  .product-card img {
    height: 200px;
    object-fit: contain;
    margin-bottom: var(--spacing-md);
  }

  .product-card h3 {
    color: var(--primary);
  }

  .product-features {
    list-style-type: none;
    margin-bottom: var(--spacing-md);
    flex-grow: 1;
  }

  .product-features li {
    margin-bottom: 0.5rem;
    color: var(--text-light);
  }

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

  .product-price {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--text);
    margin-bottom: var(--spacing-sm);
  }

  /* Maintenance Section */
  .maintenance-section .container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
  }

  .maintenance-content {
    flex: 1;
  }

  .maintenance-section img {
    flex: 1;
    max-height: 400px;
    object-fit: cover;
  }

  .maintenance-tips {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .tip {
    background-color: var(--bg-light);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
  }

  .tip i {
    font-size: 2rem;
    color: var(--primary);
    margin-bottom: var(--spacing-sm);
  }

  .tip h3 {
    margin-top: var(--spacing-sm);
  }

  /* FAQ Section */
  .faq-section {
    background-color: var(--bg-light);
  }

  .faq-container {
    max-width: 800px;
    margin: 0 auto;
  }

  .faq-item {
    margin-bottom: var(--spacing-sm);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    background-color: white;
    overflow: hidden;
  }

  .faq-question {
    width: 100%;
    text-align: left;
    padding: var(--spacing-md);
    background-color: white;
    border: none;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text);
  }

  .faq-question:hover {
    background-color: var(--bg-light);
  }

  .faq-question i {
    transition: transform 0.3s ease;
  }

  .faq-question.active i {
    transform: rotate(180deg);
  }

  .faq-answer {
    padding: 0 var(--spacing-md) var(--spacing-md);
    display: none;
  }

  .faq-answer p {
    margin-bottom: 0;
  }

  .faq-item.active .faq-answer {
    display: block;
  }

  /* CTA Section */
  .cta-section {
    background-color: var(--bg-dark);
    color: var(--text-white);
    text-align: center;
    padding: var(--spacing-xl) 0;
  }

  .cta-section .bg-image {
    opacity: 0.2;
  }

  .cta-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
  }

  .cta-section h2 {
    color: var(--text-white);
  }

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

  .cta-section p {
    color: var(--text-white);
    margin-bottom: var(--spacing-md);
  }

  /* Responsive */
  @media (min-width: 768px) {
    h1 {
      font-size: 3.5rem;
    }
    
    h2 {
      font-size: 2.5rem;
    }
    
    .intro-section .container,
    .maintenance-section .container {
      flex-direction: row;
    }
    
    .categories-grid,
    .featured-products,
    .maintenance-tips {
      grid-template-columns: repeat(2, 1fr);
    }
  }

  @media (min-width: 1024px) {
    .categories-grid {
      grid-template-columns: repeat(4, 1fr);
    }
    
    .featured-products {
      grid-template-columns: repeat(3, 1fr);
    }
    
    .maintenance-tips {
      grid-template-columns: repeat(3, 1fr);
    }
  }