:root {
    --primary-color: #0A66C2;
    --secondary-color: #7F52FF;
    --background-color: #121212;
    --text-color: #F5F5F5;
    --accent-color: #F0F0F0;
    --gradient-bg: linear-gradient(135deg, #0A66C2, #7F52FF);
    --font-primary: 'Roboto', sans-serif;
    --font-secondary: 'Open Sans', sans-serif;
    --transition-speed: 0.3s;
  }

  *, *::before, *::after {
    box-sizing: border-box;
  }

  body {
    margin: 0;
    padding: 0;
    background: var(--background-color);
    color: var(--text-color);
    font-family: var(--font-secondary);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
  }

  header {
    background: var(--gradient-bg);
    padding: 20px;
    text-align: center;
    color: white;
    font-family: var(--font-primary);
    font-size: 2em;
    position: sticky;
    top: 0;
    z-index: 1000;
  }

  main {
    flex: 1;
    padding: 20px;
    max-width: 1200px;
    margin: 0 auto;
  }

  .notice {
    background: rgba(255, 255, 255, 0.1);
    padding: 15px;
    border-radius: 8px;
    text-align: center;
    margin-bottom: 20px;
    font-size: 1.2em;
  }

  article {
    background: #1E1E1E;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.5);
    margin-bottom: 40px;
  }

  article h2, article h3, article h4 {
    color: var(--secondary-color);
    font-family: var(--font-primary);
  }

  article pre {
    background: #2D2D2D;
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
    margin: 10px 0;
  }

  article code {
    color: #F0F0F0;
    font-family: 'Courier New', Courier, monospace;
  }

  .example-data {
    background: #1E1E1E;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.5);
    margin-bottom: 40px;
  }

  .tabs {
    display: flex;
    flex-wrap: wrap;
    margin-bottom: 20px;
  }

  .tab {
    background: var(--primary-color);
    color: white;
    padding: 10px 20px;
    margin-right: 10px;
    border-radius: 8px;
    cursor: pointer;
    transition: transform var(--transition-speed), background var(--transition-speed);
    box-shadow: 4px 4px 10px rgba(0, 0, 0, 0.3), -4px -4px 10px rgba(255, 255, 255, 0.1);
  }

  .tab:hover {
    transform: scale(1.05);
    background: var(--secondary-color);
  }

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

  .active {
    display: block;
  }

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

  .gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    margin-top: 20px;
  }

  .gallery img {
    width: 100%;
    border-radius: 8px;
    transition: transform var(--transition-speed);
  }

  .gallery img:hover {
    transform: scale(1.05);
  }

  footer {
    background: var(--gradient-bg);
    color: white;
    text-align: center;
    padding: 15px;
    font-size: 1em;
    position: sticky;
    bottom: 0;
  }

  /* Responsive Design */
  @media (max-width: 1440px) {
    main {
      padding: 18px;
    }
  }

  @media (max-width: 1200px) {
    .tabs {
      flex-direction: column;
    }

    .tab {
      margin-bottom: 10px;
      width: 100%;
      text-align: center;
    }
  }

  @media (max-width: 1024px) {
    header {
      font-size: 1.8em;
    }

    article, .example-data {
      padding: 18px;
    }
  }

  @media (max-width: 768px) {
    header {
      font-size: 1.5em;
    }

    .tab {
      padding: 8px 16px;
    }

    article, .example-data {
      padding: 15px;
    }
  }

  @media (max-width: 480px) {
    header {
      font-size: 1.2em;
    }

    .tab {
      padding: 6px 12px;
      font-size: 0.9em;
    }

    .gallery {
      grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    }
  }

  @media (max-width: 320px) {
    header {
      font-size: 1em;
    }

    .tab {
      padding: 5px 10px;
      font-size: 0.8em;
    }

    .notice {
      font-size: 1em;
    }

    article, .example-data {
      padding: 10px;
    }
  }

  /* Scrollbar Styling */
  ::-webkit-scrollbar {
    width: 8px;
  }

  ::-webkit-scrollbar-track {
    background: #2D2D2D;
  }

  ::-webkit-scrollbar-thumb {
    background: var(--secondary-color);
    border-radius: 4px;
  }