:root {
    --primary: linear-gradient(135deg, #6a11cb, #2575fc);
    --secondary: #f5f5f5;
    --accent: #ff7e5f;
    --text: #333;
    --light: #fff;
    --shadow: 0 4px 20px rgba(0,0,0,0.1);
  }

  @import url('https://fonts.googleapis.com/css2?family=Roboto:wght@500;700&family=Open+Sans:wght@400;600&display=swap');

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

  body {
    font-family: 'Open Sans', sans-serif;
    color: var(--text);
    background: var(--secondary);
    line-height: 1.6;
    overflow-x: hidden;
  }

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

  /* Header Styles */
  .hero {
    position: relative;
    height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    color: white;
    text-align: center;
    overflow: hidden;
    margin-bottom: 60px;
  }

  .hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('https://images.gptkong.com/demo/sample1.png') center/cover no-repeat;
    opacity: 0.2;
    z-index: 0;
    alt: "";
  }

  .hero-content {
    position: relative;
    z-index: 1;
    padding: 40px;
    max-width: 800px;
  }

  h1, h2, h3, h4 {
    font-family: 'Roboto', sans-serif;
    font-weight: 700;
    margin-bottom: 20px;
    color: #6a11cb;
  }

  h1 {
    font-size: 2.8rem;
    line-height: 1.2;
    background: linear-gradient(to right, #fff, #feb47b);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 2px 10px rgba(0,0,0,0.1);
  }

  h2 {
    font-size: 2rem;
    margin-top: 60px;
    position: relative;
    padding-bottom: 15px;
  }

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

  h3 {
    font-size: 1.5rem;
    margin-top: 40px;
    color: #2575fc;
  }

  /* Navigation */
  .navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: var(--primary);
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    box-shadow: 0 2px 15px rgba(0,0,0,0.2);
  }

  .nav-links {
    display: flex;
    gap: 30px;
  }

  .nav-links a {
    color: white;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s ease;
    position: relative;
  }

  .nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width 0.3s ease;
  }

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

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

  .logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
    text-decoration: none;
  }

  /* Content Sections */
  .section {
    padding: 60px 0;
    position: relative;
  }

  .section:nth-child(even) {
    background: white;
  }

  .section-content {
    max-width: 800px;
    margin: 0 auto;
  }

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

  /* Code Blocks */
  pre {
    background: #1e1e1e;
    border-radius: 8px;
    padding: 20px;
    margin: 30px 0;
    overflow: auto;
    box-shadow: var(--shadow);
    position: relative;
  }

  code {
    font-family: 'Courier New', monospace;
    color: #f8f8f2;
    font-size: 0.9rem;
    line-height: 1.5;
  }

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

  /* Cards */
  .card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin: 40px 0;
  }

  .card {
    background: white;
    border-radius: 12px;
    padding: 30px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
  }

  .card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.15);
  }

  .card-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 20px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
  }

  .card:hover .card-img {
    transform: scale(1.05);
  }

  /* Images */
  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin: 40px 0;
  }

  .image-container {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
  }

  .image-container:hover {
    transform: scale(1.03);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
  }

  .image-container img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    transition: transform 0.5s ease;
    alt: "";
  }

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

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

  .animate {
    animation: fadeIn 1s ease-out forwards;
  }

  .delay-1 {
    animation-delay: 0.2s;
  }

  .delay-2 {
    animation-delay: 0.4s;
  }

  .delay-3 {
    animation-delay: 0.6s;
  }

  /* Buttons */
  .btn {
    display: inline-block;
    padding: 12px 30px;
    background: var(--primary);
    color: white;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(106, 17, 203, 0.3);
  }

  .btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(106, 17, 203, 0.4);
    background: linear-gradient(135deg, #2575fc, #6a11cb);
  }

  .btn-accent {
    background: var(--accent);
    box-shadow: 0 4px 15px rgba(255, 126, 95, 0.3);
  }

  .btn-accent:hover {
    background: linear-gradient(to right, #ff7e5f, #feb47b);
    box-shadow: 0 8px 20px rgba(255, 126, 95, 0.4);
  }

  /* Footer */
  .footer {
    background: var(--primary);
    color: white;
    padding: 60px 0 30px;
    text-align: center;
  }

  .footer p {
    margin-bottom: 10px;
  }

  .footer-links {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin: 30px 0;
  }

  .footer-links a {
    color: white;
    text-decoration: none;
    transition: color 0.3s ease;
  }

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

  .copyright {
    margin-top: 40px;
    font-size: 0.9rem;
    opacity: 0.8;
  }

  /* Responsive */
  @media (max-width: 992px) {
    .hero {
      height: 500px;
    }
    
    h1 {
      font-size: 2.2rem;
    }
    
    h2 {
      font-size: 1.8rem;
    }
    
    .nav-links {
      gap: 20px;
    }
  }

  @media (max-width: 768px) {
    .navbar {
      padding: 15px 20px;
      flex-direction: column;
      align-items: flex-start;
    }
    
    .nav-links {
      margin-top: 15px;
      flex-wrap: wrap;
      gap: 15px;
    }
    
    .hero {
      height: 400px;
    }
    
    h1 {
      font-size: 1.8rem;
    }
    
    .section {
      padding: 40px 0;
    }
  }

  @media (max-width: 576px) {
    .hero {
      height: 350px;
    }
    
    .hero-content {
      padding: 20px;
    }
    
    .card-grid {
      grid-template-columns: 1fr;
    }
    
    .image-grid {
      grid-template-columns: 1fr;
    }
  }

  /* Utility Classes */
  .text-center {
    text-align: center;
  }

  .mt-1 { margin-top: 10px; }
  .mt-2 { margin-top: 20px; }
  .mt-3 { margin-top: 30px; }
  .mt-4 { margin-top: 40px; }
  .mt-5 { margin-top: 50px; }

  .mb-1 { margin-bottom: 10px; }
  .mb-2 { margin-bottom: 20px; }
  .mb-3 { margin-bottom: 30px; }
  .mb-4 { margin-bottom: 40px; }
  .mb-5 { margin-bottom: 50px; }

  .notice {
    background: rgba(255, 255, 255, 0.9);
    padding: 15px;
    border-radius: 8px;
    margin: 30px 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    text-align: center;
    font-weight: 600;
    color: #6a11cb;
    border-left: 4px solid #6a11cb;
  }