:root {
    --primary: #0D47A1;
    --secondary: #8E24AA;
    --dark: #212121;
    --light: #E0E0E0;
    --accent: #00BCD4;
    --gradient: linear-gradient(135deg, var(--primary), var(--secondary));
  }

  @import url('https://fonts.googleapis.com/css2?family=Exo+2:wght@700&family=Roboto:wght@400;500&display=swap');

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

  body {
    font-family: 'Roboto', sans-serif;
    background: var(--dark);
    color: var(--light);
    line-height: 1.6;
    overflow-x: hidden;
  }

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

  /* Header */
  .header {
    position: relative;
    height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient);
    overflow: hidden;
    margin-bottom: 80px;
  }

  .header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('https://images.gptkong.com/demo/sample1.png') center/cover;
    opacity: 0.2;
  }

  .header-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 40px;
    max-width: 800px;
    background: rgba(33, 33, 33, 0.7);
    border-radius: 20px;
    backdrop-filter: blur(10px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    transform: translateY(0);
    transition: transform 0.5s ease;
  }

  .header:hover .header-content {
    transform: translateY(-10px);
  }

  .header h1 {
    font-family: 'Exo 2', sans-serif;
    font-size: 3.5rem;
    margin-bottom: 20px;
    background: linear-gradient(to right, var(--light), var(--accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  }

  .header p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.9;
  }

  .notice {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgba(33, 33, 33, 0.9);
    padding: 15px 25px;
    border-radius: 50px;
    font-size: 0.9rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    z-index: 1000;
    border: 1px solid var(--accent);
    animation: pulse 2s infinite;
  }

  @keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(0, 188, 212, 0.4); }
    70% { box-shadow: 0 0 0 15px rgba(0, 188, 212, 0); }
    100% { box-shadow: 0 0 0 0 rgba(0, 188, 212, 0); }
  }

  /* Navigation */
  .nav-container {
    position: sticky;
    top: 0;
    z-index: 100;
  }

  nav {
    background: rgba(33, 33, 33, 0.95);
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(10px);
  }

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

  .nav-links a {
    color: var(--light);
    text-decoration: none;
    font-weight: 500;
    font-size: 1.1rem;
    position: relative;
    padding: 5px 0;
    transition: all 0.3s ease;
  }

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

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

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

  /* Article */
  article {
    padding: 60px 0;
  }

  article h2 {
    font-family: 'Exo 2', sans-serif;
    font-size: 2.5rem;
    margin-bottom: 40px;
    color: var(--accent);
    position: relative;
    padding-bottom: 15px;
  }

  article h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100px;
    height: 3px;
    background: var(--gradient);
  }

  article h3 {
    font-family: 'Exo 2', sans-serif;
    font-size: 1.8rem;
    margin: 40px 0 20px;
    color: var(--light);
  }

  article p {
    font-size: 1.1rem;
    margin-bottom: 25px;
    line-height: 1.8;
  }

  /* Code blocks */
  pre {
    background: rgba(13, 71, 161, 0.2);
    border-left: 4px solid var(--accent);
    border-radius: 5px;
    padding: 20px;
    margin: 30px 0;
    overflow: auto;
    font-family: 'Roboto Mono', monospace;
    font-size: 0.95rem;
    line-height: 1.5;
    position: relative;
  }

  pre::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, transparent, rgba(142, 36, 170, 0.1));
    pointer-events: none;
  }

  code {
    font-family: 'Roboto Mono', monospace;
    color: var(--light);
  }

  /* Image Grid */
  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    margin: 50px 0;
  }

  .image-card {
    position: relative;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
    transition: all 0.5s cubic-bezier(0.25, 0.8, 0.25, 1);
    aspect-ratio: 1/1;
  }

  .image-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.4);
  }

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

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

  /* Footer */
  footer {
    background: rgba(13, 71, 161, 0.1);
    padding: 50px 0;
    margin-top: 80px;
    border-top: 1px solid rgba(142, 36, 170, 0.3);
  }

  .footer-content {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 40px;
  }

  .footer-section {
    flex: 1;
    min-width: 250px;
  }

  .footer-section h3 {
    font-family: 'Exo 2', sans-serif;
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--accent);
  }

  .footer-section p {
    opacity: 0.8;
  }

  /* Responsive */
  @media (max-width: 992px) {
    .header h1 {
      font-size: 2.8rem;
    }
  }

  @media (max-width: 768px) {
    .header {
      height: 500px;
    }
    
    .header h1 {
      font-size: 2.2rem;
    }
    
    .nav-links {
      gap: 15px;
    }
    
    article h2 {
      font-size: 2rem;
    }
    
    article h3 {
      font-size: 1.5rem;
    }
  }

  @media (max-width: 576px) {
    .header {
      height: 400px;
      margin-bottom: 50px;
    }
    
    .header h1 {
      font-size: 1.8rem;
    }
    
    .header-content {
      padding: 20px;
    }
    
    nav {
      padding: 15px 20px;
    }
    
    .nav-links {
      gap: 10px;
    }
    
    .nav-links a {
      font-size: 0.9rem;
    }
    
    article {
      padding: 40px 0;
    }
    
    article h2 {
      font-size: 1.8rem;
      margin-bottom: 30px;
    }
    
    article h3 {
      font-size: 1.3rem;
      margin: 30px 0 15px;
    }
    
    .image-grid {
      grid-template-columns: 1fr;
    }
  }

  /* Animations */
  @keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
    100% { transform: translateY(0px); }
  }

  .floating {
    animation: float 6s ease-in-out infinite;
  }

  /* Scroll indicator */
  .scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 50px;
    border: 2px solid var(--light);
    border-radius: 15px;
    opacity: 0.7;
  }

  .scroll-indicator::before {
    content: '';
    position: absolute;
    top: 10px;
    left: 50%;
    width: 6px;
    height: 6px;
    background: var(--light);
    border-radius: 50%;
    transform: translateX(-50%);
    animation: scroll 2s infinite;
  }

  @keyframes scroll {
    0% { opacity: 1; top: 10px; }
    100% { opacity: 0; top: 30px; }
  }