:root {
    --primary: linear-gradient(135deg, #1e3c72 0%, #2a5298 70%);
    --secondary: #2c2c2c;
    --accent: #6a11cb;
    --text: #ffffff;
    --card-bg: rgba(44, 44, 44, 0.8);
    --highlight: #2575fc;
  }

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

  body {
    background: var(--primary);
    color: var(--text);
    font-family: 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    padding-top: 80px;
    overflow-x: hidden;
  }

  .header-notice {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(0,0,0,0.7);
    color: #fff;
    text-align: center;
    padding: 10px;
    z-index: 1001;
    font-size: 14px;
  }

  .navbar {
    position: fixed;
    top: 40px;
    width: 100%;
    background: rgba(30, 60, 114, 0.8);
    backdrop-filter: blur(10px);
    display: flex;
    justify-content: center;
    padding: 15px 0;
    z-index: 1000;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.2);
  }

  .nav-link {
    color: var(--text);
    text-decoration: none;
    padding: 8px 20px;
    margin: 0 10px;
    border-radius: 20px;
    transition: all 0.3s ease;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 14px;
  }

  .nav-link:hover {
    background: rgba(255,255,255,0.2);
    transform: translateY(-2px);
  }

  .main-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px;
  }

  article {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    margin-bottom: 40px;
  }

  h2 {
    font-size: 32px;
    margin-bottom: 30px;
    background: linear-gradient(90deg, var(--accent), var(--highlight));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    position: relative;
    padding-bottom: 15px;
  }

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

  h3 {
    font-size: 24px;
    margin: 30px 0 20px;
    color: #e0e0e0;
  }

  p {
    margin-bottom: 20px;
    font-size: 17px;
    color: rgba(255,255,255,0.9);
  }

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

  .decor-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 12px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.3);
    transition: all 0.3s ease;
  }

  .decor-img:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 12px 25px rgba(0,0,0,0.4);
  }

  pre {
    background: rgba(0,0,0,0.3);
    border-radius: 8px;
    padding: 20px;
    margin: 25px 0;
    overflow: auto;
    border-left: 4px solid var(--highlight);
  }

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

  .language-css {
    display: block;
    white-space: pre;
  }

  .card-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin: 40px 0;
  }

  .feature-card {
    background: var(--secondary);
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.2);
    transition: all 0.3s ease;
    border: 1px solid rgba(255,255,255,0.1);
  }

  .feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.3);
    border-color: rgba(106, 17, 203, 0.5);
  }

  .tech-shape {
    width: 80px;
    height: 80px;
    background: linear-gradient(45deg, var(--accent), var(--highlight));
    clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
    margin: 0 auto 20px;
    animation: float 6s ease-in-out infinite;
  }

  @keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-15px) rotate(5deg); }
  }

  .footer {
    text-align: center;
    padding: 30px;
    margin-top: 50px;
    border-top: 1px solid rgba(255,255,255,0.1);
    font-size: 14px;
    color: rgba(255,255,255,0.6);
  }

  @media (max-width: 768px) {
    .navbar {
      flex-wrap: wrap;
      padding: 10px;
    }
    
    .nav-link {
      padding: 8px 12px;
      margin: 5px;
      font-size: 12px;
    }
    
    .main-container {
      padding: 20px;
    }
    
    article {
      padding: 25px;
    }
    
    h2 {
      font-size: 26px;
    }
    
    h3 {
      font-size: 20px;
    }
    
    .card-container {
      grid-template-columns: 1fr;
    }
  }

  @media (max-width: 480px) {
    .navbar {
      top: 30px;
    }
    
    .header-notice {
      font-size: 12px;
      padding: 8px;
    }
    
    .main-container {
      padding: 15px;
    }
    
    article {
      padding: 20px;
    }
  }