:root {
    --primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary: linear-gradient(45deg, #00FF7F, #32CD32);
    --accent: #FFD93D;
    --text: #2d3748;
    --light: #f8f9fa;
    --dark: #1a202c;
    --radius: 15px;
    --shadow: 0 10px 20px rgba(0,0,0,0.1);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  }

  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Helvetica Neue', Arial, sans-serif;
  }

  body {
    background: var(--light);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100%;
    display: flex;
    flex-direction: column;
  }

  .header {
    background: var(--primary);
    color: white;
    padding: 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow);
  }

  .header::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: var(--accent);
    animation: rainbow 8s linear infinite;
  }

  @keyframes rainbow {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
  }

  .notice {
    background: rgba(255,255,255,0.2);
    padding: 1rem;
    border-radius: var(--radius);
    margin: 1rem auto;
    max-width: 800px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.3);
  }

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

  article {
    background: white;
    border-radius: var(--radius);
    padding: 3rem;
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
  }

  article::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 5px;
    height: 100%;
    background: var(--primary);
  }

  h2 {
    font-size: 2rem;
    margin: 2rem 0 1rem;
    background: linear-gradient(to right, #667eea, #764ba2);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    position: relative;
    padding-bottom: 0.5rem;
  }

  h2::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 3px;
    background: var(--secondary);
  }

  h3 {
    font-size: 1.5rem;
    margin: 1.5rem 0 1rem;
    color: #764ba2;
  }

  p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
  }

  pre {
    background: #2d3748;
    color: #f8f9fa;
    padding: 1.5rem;
    border-radius: var(--radius);
    overflow-x: auto;
    margin: 1.5rem 0;
    position: relative;
  }

  pre::before {
    content: "CSS";
    position: absolute;
    top: 0;
    right: 0;
    background: var(--accent);
    color: var(--dark);
    padding: 0.2rem 0.8rem;
    border-radius: 0 0 0 var(--radius);
    font-size: 0.8rem;
    font-weight: bold;
  }

  code {
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
  }

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

  .card {
    background: white;
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
  }

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

  .card::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: var(--secondary);
    transition: var(--transition);
  }

  .card:hover::after {
    height: 10px;
  }

  .image-container {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin: 2rem 0;
    justify-content: center;
  }

  .image-box {
    width: 150px;
    height: 150px;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
  }

  .image-box:hover {
    transform: scale(1.05);
  }

  .image-box img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
  }

  .image-box:hover img {
    transform: scale(1.1);
  }

  .nav-links {
    display: flex;
    justify-content: center;
    margin: 2rem 0;
    flex-wrap: wrap;
    gap: 1rem;
  }

  .nav-link {
    padding: 0.8rem 1.5rem;
    background: var(--primary);
    color: white;
    border-radius: 50px;
    text-decoration: none;
    transition: var(--transition);
    font-weight: bold;
    position: relative;
    overflow: hidden;
  }

  .nav-link:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
  }

  .nav-link::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(rgba(255,255,255,0.2), transparent);
  }

  .footer {
    text-align: center;
    padding: 2rem;
    background: var(--dark);
    color: white;
    margin-top: 3rem;
  }

  @media (max-width: 768px) {
    .container {
      padding: 0 1rem;
    }
    
    article {
      padding: 2rem 1rem;
    }
    
    .grid {
      grid-template-columns: 1fr;
    }
  }