:root {
    --primary-color: #1E90FF;
    --secondary-color: #6A5ACD;
    --accent-color: #FFC107;
    --success-color: #28A745;
    --background-light: #F5F5F5;
    --background-dark: #121212;
    --text-light: #333;
    --text-dark: #e0e0e0;
    --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  }

  @font-face {
    font-family: 'Roboto';
    src: local('Roboto Bold'), local('Roboto-Bold');
    font-weight: bold;
  }

  @font-face {
    font-family: 'Open Sans';
    src: local('Open Sans Regular'), local('OpenSans-Regular');
    font-weight: normal;
  }

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

  body {
    font-family: 'Open Sans', sans-serif;
    line-height: 1.6;
    color: var(--text-light);
    background: linear-gradient(135deg, var(--background-light) 0%, #E0E0E0 100%);
    min-height: 100%;
    padding: 0;
    margin: 0;
  }

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

  .design-notice {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 30px;
    text-align: center;
    box-shadow: var(--card-shadow);
    font-size: 16px;
    color: var(--primary-color);
    border-left: 5px solid var(--accent-color);
  }

  article {
    background: white;
    border-radius: 12px;
    padding: 40px;
    box-shadow: var(--card-shadow);
    margin-bottom: 40px;
  }

  h2 {
    font-family: 'Roboto', sans-serif;
    font-size: 28px;
    color: var(--primary-color);
    margin-bottom: 25px;
    position: relative;
    padding-bottom: 15px;
  }

  h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 2px;
  }

  h3 {
    font-family: 'Roboto', sans-serif;
    font-size: 22px;
    color: var(--secondary-color);
    margin: 30px 0 15px;
  }

  p {
    font-size: 16px;
    margin-bottom: 20px;
    color: #555;
  }

  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin: 30px 0;
  }

  .decorative-image {
    width: 100%;
    height: 300px;
    object-fit: cover;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
  }

  .decorative-image:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
  }

  pre {
    background: #282c34;
    border-radius: 8px;
    padding: 20px;
    margin: 20px 0;
    overflow: auto;
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.5);
  }

  code {
    font-family: 'Courier New', monospace;
    color: #abb2bf;
    font-size: 14px;
  }

  table {
    width: 100%;
    border-collapse: collapse;
    margin: 25px 0;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
    overflow: hidden;
  }

  th, td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid #ddd;
  }

  th {
    background-color: var(--primary-color);
    color: white;
    font-family: 'Roboto', sans-serif;
  }

  tr:nth-child(even) {
    background-color: #f8f9fa;
  }

  tr:hover {
    background-color: #f1f1f1;
  }

  .nav-tabs {
    display: flex;
    flex-wrap: wrap;
    margin: 30px 0;
    border-bottom: 1px solid #ddd;
  }

  .nav-tab {
    padding: 10px 20px;
    cursor: pointer;
    background: #f8f9fa;
    margin-right: 5px;
    border-radius: 5px 5px 0 0;
    transition: var(--transition);
  }

  .nav-tab.active {
    background: var(--primary-color);
    color: white;
  }

  .tab-content {
    display: none;
    padding: 20px;
    background: white;
    border-radius: 0 0 8px 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  }

  .tab-content.active {
    display: block;
  }

  .accordion {
    margin: 20px 0;
  }

  .accordion-header {
    padding: 15px;
    background: var(--primary-color);
    color: white;
    cursor: pointer;
    border-radius: 5px;
    margin-bottom: 5px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
  }

  .accordion-header:hover {
    background: #1565c0;
  }

  .accordion-content {
    padding: 15px;
    background: white;
    border-radius: 0 0 5px 5px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    display: none;
  }

  .accordion-content.active {
    display: block;
  }

  @media (max-width: 768px) {
    article {
      padding: 20px;
    }
    
    h2 {
      font-size: 24px;
    }
    
    h3 {
      font-size: 20px;
    }
    
    .image-grid {
      grid-template-columns: 1fr;
    }
  }

  /* Animation effects */
  @keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
  }

  .animate-fade {
    animation: fadeIn 0.6s ease-out forwards;
  }

  .delay-1 { animation-delay: 0.1s; }
  .delay-2 { animation-delay: 0.2s; }
  .delay-3 { animation-delay: 0.3s; }