:root {
    --primary: #f0f0f0;
    --secondary: #d9d9d9;
    --accent: #0074D9;
    --highlight: #2ECC40;
    --text: #333;
    --card-bg: #fff;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  }

  @font-face {
    font-family: 'TechFont';
    src: local('Segoe UI'), local('Roboto'), sans-serif;
  }

  body {
    margin: 0;
    padding: 0;
    font-family: 'TechFont', sans-serif;
    color: var(--text);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    line-height: 1.6;
  }

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

  header {
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
  }

  header::after {
    content: "";
    display: block;
    width: 100px;
    height: 4px;
    background: linear-gradient(90deg, var(--accent), var(--highlight));
    margin: 1rem auto;
    border-radius: 2px;
  }

  h1, h2, h3, h4 {
    color: var(--text);
    margin-top: 2rem;
    position: relative;
  }

  h2 {
    font-size: 2rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid rgba(0, 116, 217, 0.2);
  }

  h3 {
    font-size: 1.5rem;
    margin-top: 2.5rem;
  }

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

  .grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
  }

  .card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }

  .card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
  }

  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
  }

  .decorative-img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
  }

  .decorative-img:hover {
    transform: scale(1.03);
  }

  pre {
    background: #2d2d2d;
    color: #f8f8f2;
    padding: 1.5rem;
    border-radius: 8px;
    overflow-x: auto;
    font-size: 0.9rem;
    margin: 2rem 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  }

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

  table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  }

  th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid #ddd;
  }

  th {
    background-color: var(--accent);
    color: white;
  }

  tr:nth-child(even) {
    background-color: rgba(0, 116, 217, 0.05);
  }

  .notice {
    background: rgba(0, 116, 217, 0.1);
    border-left: 4px solid var(--accent);
    padding: 1rem;
    margin: 2rem 0;
    border-radius: 0 4px 4px 0;
  }

  .button {
    display: inline-block;
    background: linear-gradient(45deg, var(--accent), var(--highlight));
    color: white;
    padding: 0.8rem 1.5rem;
    border-radius: 4px;
    text-decoration: none;
    font-weight: bold;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 116, 217, 0.3);
  }

  .button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 116, 217, 0.4);
  }

  @media (max-width: 768px) {
    .grid {
      grid-template-columns: 1fr;
    }
    
    h2 {
      font-size: 1.8rem;
    }
    
    h3 {
      font-size: 1.3rem;
    }
  }

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

  .animated {
    animation: fadeIn 0.8s ease forwards;
  }

  .delay-1 { animation-delay: 0.2s; }
  .delay-2 { animation-delay: 0.4s; }
  .delay-3 { animation-delay: 0.6s; }

  /* Navigation */
  .nav-container {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  }

  nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .nav-links {
    display: flex;
    gap: 2rem;
  }

  .nav-link {
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    padding: 0.5rem 0;
  }

  .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width 0.3s ease;
  }

  .nav-link:hover::after {
    width: 100%;
  }

  /* Chart example */
  .chart-container {
    height: 300px;
    margin: 2rem 0;
    position: relative;
  }

  .chart-bar {
    position: absolute;
    bottom: 0;
    width: 40px;
    background: linear-gradient(to top, var(--accent), var(--highlight));
    border-radius: 4px 4px 0 0;
    animation: grow 1s ease-out forwards;
  }

  @keyframes grow {
    from { height: 0; }
    to { height: var(--height); }
  }

  /* Floating elements */
  .floating {
    position: absolute;
    width: 100px;
    height: 100px;
    background: rgba(0, 116, 217, 0.1);
    border-radius: 50%;
    filter: blur(40px);
    z-index: -1;
  }

  .floating-1 {
    top: 10%;
    left: 10%;
    width: 200px;
    height: 200px;
    background: rgba(46, 204, 64, 0.1);
  }

  .floating-2 {
    bottom: 10%;
    right: 10%;
    width: 150px;
    height: 150px;
  }