:root {
    --primary: linear-gradient(135deg, #0d47a1, #512da8, #006064);
    --secondary: #212121;
    --accent: #00e676;
    --text: #ffffff;
    --highlight: #00c853;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  }

  @font-face {
    font-family: 'Orbitron';
    src: url('https://fonts.gstatic.com/s/orbitron/v25/yMJMMIlzdpvBhQQL_SC3X9yhF25-T1nyxSmxpg.woff2') format('woff2');
    font-weight: 700;
  }

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

  body {
    font-family: 'Roboto', 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 {
    background: var(--primary);
    padding: 100px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
    margin-bottom: 60px;
  }

  .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;
    z-index: 0;
  }

  .header-content {
    position: relative;
    z-index: 1;
  }

  h1 {
    font-family: 'Orbitron', sans-serif;
    font-size: 3rem;
    margin-bottom: 20px;
    text-shadow: 0 5px 15px rgba(0, 0, 0, 0.5);
  }

  .subtitle {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto 30px;
  }

  .notice {
    background: rgba(0, 0, 0, 0.7);
    padding: 15px;
    border-radius: 8px;
    display: inline-block;
    margin-top: 30px;
    border: 1px solid var(--accent);
  }

  .nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(0, 0, 0, 0.9);
    padding: 15px 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
  }

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

  .nav-logo {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.5rem;
    color: var(--accent);
    text-decoration: none;
  }

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

  .nav-link {
    color: var(--text);
    text-decoration: none;
    transition: color 0.3s;
    position: relative;
  }

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

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

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

  article {
    background: rgba(30, 30, 30, 0.8);
    border-radius: 15px;
    padding: 40px;
    margin-bottom: 60px;
    box-shadow: var(--shadow);
  }

  h2 {
    font-family: 'Orbitron', sans-serif;
    font-size: 2rem;
    margin: 40px 0 20px;
    color: var(--accent);
  }

  h3 {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.5rem;
    margin: 30px 0 15px;
  }

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

  .grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 30px;
    margin: 40px 0;
  }

  .card {
    background: rgba(33, 33, 33, 0.8);
    border-radius: 10px;
    padding: 30px;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
  }

  .card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
  }

  .card-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 20px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s;
  }

  .card:hover .card-img {
    transform: scale(1.03);
  }

  pre {
    background: #1e1e1e;
    padding: 20px;
    border-radius: 8px;
    overflow: auto;
    margin: 30px 0;
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.5);
    border-left: 4px solid var(--accent);
  }

  code {
    font-family: 'Courier New', monospace;
    color: #f8f8f2;
  }

  .language-css {
    color: #66d9ef;
  }

  .footer {
    background: var(--primary);
    padding: 50px 0;
    text-align: center;
    margin-top: 60px;
  }

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

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

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

  @media (max-width: 768px) {
    .grid {
      grid-template-columns: 1fr;
    }
    
    .nav-menu {
      display: none;
    }
    
    h1 {
      font-size: 2rem;
    }
    
    article {
      padding: 20px;
    }
  }

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

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

  .scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
  }

  .scroll-reveal.visible {
    opacity: 1;
    transform: translateY(0);
  }