:root {
    --primary-color: #0D47A1;
    --secondary-color: #6200EA;
    --accent-color: #00E676;
    --text-color: #FFFFFF;
    --bg-gradient: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    --card-bg: rgba(255, 255, 255, 0.1);
    --font-main: 'Roboto', sans-serif;
    --font-heading: 'Montserrat', sans-serif;
  }

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

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

  body {
    font-family: var(--font-main);
    color: var(--text-color);
    background: var(--bg-gradient);
    line-height: 1.6;
    overflow-x: hidden;
  }

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

  .design-notice {
    position: fixed;
    bottom: 10px;
    left: 10px;
    background: rgba(0,0,0,0.7);
    padding: 8px 15px;
    border-radius: 20px;
    font-size: 12px;
    z-index: 1000;
  }

  /* Navigation */
  .navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  }

  .navbar-logo {
    font-family: var(--font-heading);
    font-weight: bold;
    font-size: 1.5rem;
    color: var(--text-color);
    text-decoration: none;
  }

  .nav-links {
    display: flex;
    gap: 20px;
  }

  .nav-links a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
  }

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

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

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

  /* Hero Section */
  .hero {
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 100px 20px;
    position: relative;
    overflow: hidden;
  }

  .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: -1;
  }

  .hero-content {
    max-width: 800px;
    animation: fadeIn 1.5s ease;
  }

  @keyframes fadeIn {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
  }

  .hero h1 {
    font-family: var(--font-heading);
    font-size: 3rem;
    margin-bottom: 20px;
    text-shadow: 0 4px 10px rgba(0,0,0,0.3);
  }

  .hero p {
    font-size: 1.2rem;
    margin-bottom: 30px;
  }

  /* Main Content */
  main {
    padding: 100px 0;
  }

  article {
    background: rgba(0,0,0,0.2);
    border-radius: 15px;
    padding: 40px;
    backdrop-filter: blur(10px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    margin-bottom: 50px;
  }

  article h2 {
    font-family: var(--font-heading);
    font-size: 2rem;
    margin-bottom: 30px;
    color: var(--accent-color);
    position: relative;
    padding-bottom: 15px;
  }

  article h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-color), transparent);
  }

  article h3 {
    font-size: 1.5rem;
    margin: 25px 0 15px;
    color: var(--text-color);
  }

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

  /* Code Blocks */
  pre {
    background: rgba(0,0,0,0.3);
    border-radius: 8px;
    padding: 20px;
    margin: 20px 0;
    overflow: auto;
    border-left: 3px solid var(--accent-color);
  }

  code {
    font-family: 'Courier New', monospace;
    color: var(--accent-color);
  }

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

  .grid-item {
    background: var(--card-bg);
    border-radius: 10px;
    padding: 25px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(5px);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }

  .grid-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.2);
  }

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

  .gallery-item {
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    transition: transform 0.3s ease;
  }

  .gallery-item:hover {
    transform: scale(1.05);
  }

  .gallery-item img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    transition: transform 0.5s ease;
  }

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

  /* Buttons */
  .button {
    display: inline-block;
    background-color: var(--secondary-color);
    color: var(--text-color);
    padding: 12px 25px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(98, 0, 234, 0.3);
  }

  .button:hover {
    background-color: var(--accent-color);
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 230, 118, 0.4);
  }

  /* Footer */
  footer {
    background: rgba(0,0,0,0.3);
    padding: 30px 0;
    text-align: center;
    margin-top: 50px;
  }

  .footer-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 20px;
  }

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

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

  /* Responsive */
  @media (max-width: 768px) {
    .hero h1 {
      font-size: 2.2rem;
    }
    
    .nav-links {
      display: none;
    }
    
    article {
      padding: 25px;
    }
    
    .grid-container {
      grid-template-columns: 1fr;
    }
  }