:root {
    --primary: #0074D9;
    --secondary: #8E44AD;
    --accent: #F1C40F;
    --light: rgba(255,255,255,0.9);
    --dark: #111;
    --gray: #C0C0C0;
    --spacing: 40px;
    --radius: 12px;
    --shadow: 0 8px 32px rgba(31, 38, 135, 0.2);
    --transition: all 0.3s ease;
  }

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

  body {
    font-family: 'Roboto', 'Helvetica', sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e8eb 100%);
    padding-top: 80px;
  }

  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing);
  }

  /* Header */
  header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0,0,0,0.1);
    z-index: 1000;
    padding: 15px 0;
  }

  .header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    display: flex;
    align-items: center;
  }

  .logo img {
    width: 40px;
    height: 40px;
    margin-right: 10px;
    border-radius: 50%;
  }

  nav ul {
    display: flex;
    list-style: none;
  }

  nav li {
    margin-left: 30px;
  }

  nav a {
    color: var(--dark);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
  }

  nav a:hover {
    color: var(--primary);
  }

  nav a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
  }

  nav a:hover::after {
    width: 100%;
  }

  /* Hero Section */
  .hero {
    padding: 80px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
  }

  .hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 50% 50%, rgba(0,116,217,0.1) 0%, transparent 70%);
    z-index: -1;
  }

  .hero h1 {
    font-size: 48px;
    margin-bottom: 20px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: fadeIn 1s ease;
  }

  .hero p {
    font-size: 20px;
    color: #555;
    max-width: 800px;
    margin: 0 auto 40px;
  }

  .hero-images {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-top: 50px;
    flex-wrap: wrap;
  }

  .hero-image {
    width: 280px;
    height: 280px;
    border-radius: var(--radius);
    object-fit: cover;
    box-shadow: var(--shadow);
    transition: var(--transition);
    filter: grayscale(20%);
  }

  .hero-image:hover {
    transform: translateY(-10px);
    filter: grayscale(0);
  }

  /* Content Sections */
  section {
    padding: 80px 0;
    position: relative;
  }

  section:nth-child(even) {
    background: rgba(255,255,255,0.7);
    backdrop-filter: blur(5px);
  }

  .section-header {
    text-align: center;
    margin-bottom: 60px;
  }

  .section-header h2 {
    font-size: 36px;
    margin-bottom: 15px;
    color: var(--primary);
  }

  .section-header p {
    color: #666;
    max-width: 700px;
    margin: 0 auto;
  }

  /* Cards */
  .card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
  }

  .card {
    background: white;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
  }

  .card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.15);
  }

  .card-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
  }

  .card-body {
    padding: 25px;
  }

  .card-body h3 {
    font-size: 22px;
    margin-bottom: 15px;
    color: var(--primary);
  }

  .card-body p {
    color: #555;
    margin-bottom: 20px;
  }

  /* Code Blocks */
  pre {
    background: #2d2d2d;
    border-radius: var(--radius);
    padding: 20px;
    margin: 30px 0;
    overflow-x: auto;
    box-shadow: var(--shadow);
  }

  code {
    font-family: 'Courier New', monospace;
    color: #f8f8f2;
    font-size: 14px;
    line-height: 1.5;
  }

  /* Article Content */
  article {
    max-width: 900px;
    margin: 0 auto;
    padding: 40px;
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
  }

  article h2 {
    font-size: 32px;
    color: var(--primary);
    margin: 40px 0 20px;
  }

  article h3 {
    font-size: 26px;
    color: var(--secondary);
    margin: 30px 0 15px;
  }

  article p {
    margin-bottom: 20px;
    color: #444;
    font-size: 17px;
    line-height: 1.7;
  }

  article img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius);
    margin: 30px auto;
    display: block;
    box-shadow: var(--shadow);
  }

  /* Table */
  table {
    width: 100%;
    border-collapse: collapse;
    margin: 30px 0;
    box-shadow: var(--shadow);
    border-radius: var(--radius);
    overflow: hidden;
  }

  th, td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid #eee;
  }

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

  tr:nth-child(even) {
    background: #f9f9f9;
  }

  tr:hover {
    background: #f1f1f1;
  }

  /* Footer */
  footer {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 60px 0 30px;
    text-align: center;
  }

  .footer-links {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 30px;
    flex-wrap: wrap;
  }

  .footer-links a {
    color: white;
    text-decoration: none;
    transition: var(--transition);
  }

  .footer-links a:hover {
    color: var(--accent);
  }

  .copyright {
    margin-top: 30px;
    font-size: 14px;
    opacity: 0.8;
  }

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

  /* Responsive */
  @media (max-width: 768px) {
    .header-container {
      flex-direction: column;
    }

    nav ul {
      margin-top: 20px;
    }

    nav li {
      margin: 0 10px;
    }

    .hero h1 {
      font-size: 36px;
    }

    article {
      padding: 30px 20px;
    }
  }

  @media (max-width: 480px) {
    .hero-images {
      flex-direction: column;
      align-items: center;
    }

    .hero-image {
      width: 100%;
      max-width: 300px;
    }
  }