:root {
    --primary-dark: #0D47A1;
    --primary-light: #6A1B9A;
    --accent-blue: #00E5FF;
    --accent-green: #1DE9B6;
    --accent-purple: #7B1FA2;
    --text-light: #FFFFFF;
    --text-dark: #212121;
    --card-bg: rgba(255, 255, 255, 0.1);
    --section-padding: 80px 0;
  }

  @font-face {
    font-family: 'Roboto';
    src: url('https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700&display=swap');
  }

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

  html {
    scroll-behavior: smooth;
    font-size: 16px;
  }

  body {
    font-family: 'Roboto', sans-serif;
    color: var(--text-light);
    line-height: 1.6;
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-light));
    position: relative;
    overflow-x: hidden;
  }

  body::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
      radial-gradient(circle at 20% 30%, rgba(29, 233, 182, 0.1) 0%, transparent 20%),
      radial-gradient(circle at 80% 70%, rgba(0, 229, 255, 0.1) 0%, transparent 20%);
    z-index: -1;
    animation: GradientAnimation 15s ease infinite;
    background-size: 600% 600%;
  }

  @keyframes GradientAnimation {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
  }

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

  /* Header Styles */
  header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(13, 71, 161, 0.9);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.2);
    padding: 15px 0;
  }

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

  .logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-light);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .logo img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
  }

  .nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
  }

  .nav-item {
    position: relative;
  }

  .nav-link {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    padding: 5px 0;
    position: relative;
  }

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

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

  .nav-link:hover {
    color: var(--accent-blue);
  }

  /* Hero Section */
  .hero {
    padding: 180px 0 100px;
    text-align: center;
    position: relative;
  }

  .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 h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-green));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    animation: textShine 3s ease infinite;
  }

  @keyframes textShine {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
  }

  .hero p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto 40px;
    color: rgba(255, 255, 255, 0.9);
  }

  .hero-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 30px;
  }

  .btn {
    padding: 12px 30px;
    border-radius: 30px;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-block;
    font-size: 1rem;
    border: none;
    cursor: pointer;
  }

  .btn-primary {
    background: linear-gradient(45deg, var(--accent-blue), var(--accent-green));
    color: var(--text-dark);
    box-shadow: 0 4px 15px rgba(0, 229, 255, 0.4);
  }

  .btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 229, 255, 0.6);
  }

  .btn-secondary {
    background: transparent;
    color: var(--text-light);
    border: 2px solid var(--accent-blue);
  }

  .btn-secondary:hover {
    background: rgba(0, 229, 255, 0.1);
    transform: translateY(-3px);
  }

  /* Main Content */
  main {
    padding: 60px 0;
  }

  .section-title {
    font-size: 2.2rem;
    margin-bottom: 40px;
    position: relative;
    display: inline-block;
    color: var(--text-light);
  }

  .section-title::after {
    content: '';
    position: absolute;
    width: 50%;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-green));
    bottom: -10px;
    left: 0;
    border-radius: 2px;
  }

  .article-container {
    background: rgba(13, 71, 161, 0.2);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    margin-bottom: 60px;
  }

  article h2 {
    font-size: 2rem;
    margin: 30px 0 20px;
    color: var(--accent-blue);
  }

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

  article p {
    margin-bottom: 20px;
    line-height: 1.8;
  }

  pre {
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
    padding: 20px;
    margin: 20px 0;
    overflow-x: auto;
    border-left: 4px solid var(--accent-blue);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
  }

  code {
    font-family: 'Courier New', monospace;
    background: rgba(0, 0, 0, 0.2);
    padding: 2px 5px;
    border-radius: 3px;
    font-size: 0.9rem;
  }

  /* Image Gallery */
  .image-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin: 40px 0;
  }

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

  .gallery-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 229, 255, 0.3);
  }

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

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

  /* Footer */
  footer {
    background: rgba(13, 71, 161, 0.8);
    padding: 40px 0;
    text-align: center;
    position: relative;
  }

  footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('https://images.gptkong.com/demo/sample12.png') center/cover no-repeat;
    opacity: 0.1;
    z-index: -1;
  }

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

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

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

  .footer-link:hover {
    color: var(--accent-blue);
  }

  .copyright {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
  }

  /* Responsive Design */
  @media (max-width: 992px) {
    .hero h1 {
      font-size: 2.8rem;
    }
    
    .nav-menu {
      gap: 20px;
    }
  }

  @media (max-width: 768px) {
    .hero {
      padding: 150px 0 80px;
    }
    
    .hero h1 {
      font-size: 2.2rem;
    }
    
    .hero p {
      font-size: 1rem;
    }
    
    .hero-buttons {
      flex-direction: column;
      align-items: center;
    }
    
    .article-container {
      padding: 30px;
    }
    
    article h2 {
      font-size: 1.8rem;
    }
    
    article h3 {
      font-size: 1.3rem;
    }
  }

  @media (max-width: 576px) {
    .header-container {
      flex-direction: column;
      gap: 15px;
    }
    
    .nav-menu {
      flex-direction: column;
      gap: 10px;
      text-align: center;
    }
    
    .hero {
      padding: 120px 0 60px;
    }
    
    .hero h1 {
      font-size: 1.8rem;
    }
    
    .article-container {
      padding: 20px;
    }
  }

  /* Floating Elements */
  .floating {
    position: absolute;
    z-index: -1;
    opacity: 0.7;
  }

  .floating-1 {
    top: 20%;
    left: 5%;
    width: 100px;
    height: 100px;
    background: radial-gradient(circle, var(--accent-blue), transparent 70%);
    border-radius: 50%;
    filter: blur(20px);
    animation: float 8s ease-in-out infinite;
  }

  .floating-2 {
    bottom: 15%;
    right: 10%;
    width: 150px;
    height: 150px;
    background: radial-gradient(circle, var(--accent-green), transparent 70%);
    border-radius: 50%;
    filter: blur(25px);
    animation: float 10s ease-in-out infinite reverse;
  }

  @keyframes float {
    0% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(5deg); }
    100% { transform: translateY(0) rotate(0deg); }
  }

  /* Notification */
  .notification {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgba(0, 0, 0, 0.7);
    color: var(--text-light);
    padding: 15px 25px;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    z-index: 1001;
    backdrop-filter: blur(10px);
    border-left: 4px solid var(--accent-blue);
    transform: translateX(150%);
    transition: transform 0.5s ease;
  }

  .notification.show {
    transform: translateX(0);
  }