:root {
    --primary-dark: #1E3A8A;
    --primary-light: #3B82F6;
    --accent-orange: #F97316;
    --accent-green: #10B981;
    --neutral-dark: #4B5563;
    --neutral-light: #f3f4f6;
    --white: #ffffff;
  }

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

  body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    color: var(--neutral-dark);
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
    min-height: 100%;
    overflow-x: hidden;
  }

  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
  }

  .design-notice {
    background: linear-gradient(90deg, var(--primary-dark), var(--primary-light));
    color: var(--white);
    padding: 1rem;
    text-align: center;
    margin-bottom: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    font-weight: 500;
  }

  article {
    background: var(--white);
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
    margin-bottom: 3rem;
  }

  article h2 {
    color: var(--primary-dark);
    font-size: 2rem;
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 0.5rem;
  }

  article h2:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-orange), var(--accent-green));
    border-radius: 2px;
  }

  article h3 {
    color: var(--primary-light);
    font-size: 1.5rem;
    margin: 2rem 0 1rem;
    position: relative;
    padding-left: 1rem;
  }

  article h3:before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.4em;
    height: 1em;
    width: 4px;
    background: var(--accent-orange);
    border-radius: 2px;
  }

  article p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    line-height: 1.8;
  }

  pre {
    background: #2d3748;
    color: #f7fafc;
    padding: 1.5rem;
    border-radius: 8px;
    margin: 1.5rem 0;
    overflow: auto;
    position: relative;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  }

  pre:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 30px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px 8px 0 0;
  }

  code {
    font-family: 'Fira Code', monospace;
    font-size: 0.9rem;
  }

  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
  }

  .image-card {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }

  .image-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  }

  .image-card img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 12px 12px 0 0;
  }

  .image-caption {
    padding: 1rem;
    text-align: center;
    color: var(--primary-dark);
    font-weight: 500;
  }

  .nav-tabs {
    display: flex;
    margin-bottom: 2rem;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
  }

  .nav-tab {
    padding: 0.75rem 1.5rem;
    margin-right: 0.5rem;
    background: transparent;
    border: none;
    border-radius: 6px 6px 0 0;
    cursor: pointer;
    font-weight: 500;
    color: var(--neutral-dark);
    transition: all 0.3s ease;
    position: relative;
  }

  .nav-tab.active {
    color: var(--primary-light);
    background: rgba(59, 130, 246, 0.1);
  }

  .nav-tab.active:after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary-light);
    border-radius: 3px 3px 0 0;
  }

  .tab-content {
    display: none;
    animation: fadeIn 0.5s ease;
  }

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

  @keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
  }

  .tech-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: rgba(16, 185, 129, 0.1);
    color: var(--accent-green);
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 500;
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
  }

  .highlight-box {
    background: linear-gradient(135deg, rgba(30, 58, 138, 0.05) 0%, rgba(59, 130, 246, 0.05) 100%);
    border-left: 4px solid var(--primary-light);
    padding: 1.5rem;
    margin: 1.5rem 0;
    border-radius: 0 8px 8px 0;
  }

  @media (max-width: 768px) {
    .container {
      padding: 1rem;
    }

    article {
      padding: 1.5rem;
    }

    article h2 {
      font-size: 1.5rem;
    }

    article h3 {
      font-size: 1.25rem;
    }

    .image-grid {
      grid-template-columns: 1fr;
    }
  }