:root {
    --primary-color: #2C3E50;
    --secondary-color: #8E44AD;
    --accent-color-1: #27AE60;
    --accent-color-2: #E67E22;
    --background-gradient: linear-gradient(135deg, #2C3E50, #8E44AD);
    --text-color: #ecf0f1;
    --card-bg: rgba(255, 255, 255, 0.2);
    --transition: all 0.3s ease;
  }

  @font-face {
    font-family: 'Roboto';
    src: url('https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700&display=swap');
  }

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

  body {
    background: var(--background-gradient);
    color: var(--text-color);
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    min-height: 100%;
    position: relative;
    padding-bottom: 80px;
  }

  .design-notice {
    position: fixed;
    top: 20px;
    right: 20px;
    background: rgba(0,0,0,0.7);
    color: white;
    padding: 10px 20px;
    border-radius: 30px;
    z-index: 1000;
    backdrop-filter: blur(5px);
    font-size: 14px;
  }

  .navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(44, 62, 80, 0.8);
    backdrop-filter: blur(10px);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 50px;
    transition: var(--transition);
    z-index: 100;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
  }

  .navbar.dark-mode {
    background: rgba(52, 73, 94, 0.8);
  }

  .theme-toggle {
    cursor: pointer;
    padding: 10px 20px;
    background: var(--accent-color-1);
    border: none;
    border-radius: 25px;
    color: white;
    font-weight: 500;
    transition: var(--transition);
  }

  .theme-toggle:hover {
    transform: scale(1.05);
    background: var(--accent-color-2);
  }

  .main-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 120px 30px 60px;
  }

  article {
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(5px);
    border-radius: 20px;
    padding: 40px;
    margin-bottom: 40px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  }

  article h2 {
    font-size: 32px;
    margin-bottom: 30px;
    color: white;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
    position: relative;
    padding-bottom: 15px;
  }

  article h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-color-1), var(--accent-color-2));
    border-radius: 3px;
  }

  article h3 {
    font-size: 24px;
    margin: 30px 0 20px;
    color: white;
  }

  article p {
    margin-bottom: 20px;
    font-size: 17px;
  }

  article em {
    font-style: italic;
    color: #f1c40f;
  }

  article strong {
    font-weight: 700;
    color: white;
  }

  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin: 40px 0;
  }

  .decorative-img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    border-radius: 15px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
    transition: var(--transition);
  }

  .decorative-img:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.3);
  }

  pre {
    background: rgba(0, 0, 0, 0.4);
    border-radius: 10px;
    padding: 20px;
    margin: 25px 0;
    overflow-x: auto;
    font-family: 'Courier New', monospace;
    font-size: 15px;
    line-height: 1.5;
    border-left: 4px solid var(--accent-color-1);
  }

  code {
    color: #f8f8f2;
    font-family: 'Courier New', monospace;
  }

  .footer {
    background: rgba(44, 62, 80, 0.9);
    color: #bdc3c7;
    padding: 20px 50px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: fixed;
    bottom: 0;
    width: 100%;
    backdrop-filter: blur(10px);
    font-size: 14px;
  }

  .language-switcher button {
    background: none;
    border: none;
    color: #bdc3c7;
    margin-left: 10px;
    cursor: pointer;
    transition: color 0.3s ease;
  }

  .language-switcher button:hover {
    color: var(--accent-color-1);
  }

  @media (max-width: 768px) {
    .navbar {
      padding: 15px 20px;
    }
    
    .main-container {
      padding: 100px 20px 60px;
    }
    
    article {
      padding: 30px 20px;
    }
    
    article h2 {
      font-size: 28px;
    }
    
    article h3 {
      font-size: 22px;
    }
    
    .image-grid {
      grid-template-columns: 1fr;
    }
  }