:root {
    --primary: #1e3c72;
    --secondary: #2a5298;
    --accent: #ff7e5f;
    --light: #f0f4f8;
    --dark: #333;
    --white: #fff;
    --shadow: 0 4px 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;
  }

  body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background: var(--light);
    overflow-x: hidden;
  }

  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
  }

  header {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--white);
    padding: 60px 0 100px;
    clip-path: polygon(0 0, 100% 0, 100% 85%, 0 100%);
    position: relative;
    margin-bottom: 80px;
    text-align: center;
  }

  header::after {
    content: '';
    position: absolute;
    bottom: -50px;
    left: 0;
    width: 100%;
    height: 100px;
    background: var(--light);
    clip-path: polygon(0 0, 100% 0, 100% 100%, 0 85%);
  }

  h1, h2, h3, h4 {
    font-family: 'Roboto', sans-serif;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
    color: var(--primary);
  }

  h1 {
    font-size: 2.8rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
  }

  h2 {
    font-size: 2.2rem;
    margin-top: 60px;
    position: relative;
    padding-bottom: 15px;
  }

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

  h3 {
    font-size: 1.8rem;
    margin-top: 40px;
    color: var(--secondary);
  }

  p {
    margin-bottom: 20px;
    font-size: 1.1rem;
  }

  .hero {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
  }

  .hero p {
    font-size: 1.2rem;
    opacity: 0.9;
    margin-top: 20px;
  }

  .notice {
    background: rgba(255,255,255,0.2);
    backdrop-filter: blur(10px);
    padding: 15px;
    border-radius: 8px;
    display: inline-block;
    margin: 30px 0;
    font-size: 0.9rem;
    border: 1px solid rgba(255,255,255,0.3);
  }

  .card {
    background: var(--white);
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 30px;
    margin-bottom: 40px;
    transition: var(--transition);
  }

  .card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
  }

  .img-container {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin: 30px 0;
    justify-content: center;
  }

  .img-box {
    width: 300px;
    height: 300px;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
  }

  .img-box:hover {
    transform: scale(1.03);
    box-shadow: 0 15px 35px rgba(0,0,0,0.2);
  }

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

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

  pre {
    background: #2d3748;
    color: #f8f8f2;
    padding: 20px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 30px 0;
    font-size: 0.9rem;
    line-height: 1.5;
    box-shadow: var(--shadow);
  }

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

  .language-css {
    display: block;
  }

  .nav-links {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    display: flex;
    gap: 15px;
  }

  .nav-link {
    color: var(--white);
    text-decoration: none;
    padding: 8px 15px;
    border-radius: 20px;
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(5px);
    transition: var(--transition);
    font-size: 0.9rem;
  }

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

  .section-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(30,60,114,0.5), transparent);
    margin: 60px 0;
  }

  footer {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--white);
    padding: 40px 0;
    text-align: center;
    margin-top: 80px;
  }

  @media (max-width: 768px) {
    h1 {
      font-size: 2.2rem;
    }
    
    h2 {
      font-size: 1.8rem;
    }
    
    h3 {
      font-size: 1.5rem;
    }
    
    .img-box {
      width: 100%;
      max-width: 300px;
    }
    
    .nav-links {
      top: 10px;
      right: 10px;
    }
  }