:root {
    --primary: #0d47a1;
    --secondary: #6a1b9a;
    --accent: #ffab00;
    --text: #eceff1;
    --bg: linear-gradient(135deg, #0d47a1, #6a1b9a, #b0bec5);
    --card-bg: rgba(255, 255, 255, 0.1);
    --border: rgba(255, 255, 255, 0.3);
  }

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

  body {
    font-family: 'Roboto', sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background 0.5s ease-in-out;
  }

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

  header {
    padding: 60px 0 40px;
    text-align: center;
    position: relative;
  }

  h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    background: linear-gradient(90deg, var(--accent), #fff);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
  }

  .notice {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgba(0, 0, 0, 0.7);
    padding: 10px 15px;
    border-radius: 5px;
    font-size: 0.9rem;
    z-index: 100;
  }

  .hero {
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    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: -1;
    border-radius: 20px;
  }

  .hero-content {
    text-align: center;
    max-width: 800px;
    padding: 40px;
    background: rgba(0, 0, 0, 0.5);
    border-radius: 20px;
    backdrop-filter: blur(10px);
    border: 1px solid var(--border);
  }

  h2 {
    font-size: 1.8rem;
    margin: 40px 0 20px;
    color: var(--accent);
    position: relative;
    display: inline-block;
  }

  h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), transparent);
  }

  h3 {
    font-size: 1.5rem;
    margin: 30px 0 15px;
    color: #fff;
  }

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

  article {
    background: rgba(0, 0, 0, 0.3);
    padding: 40px;
    border-radius: 20px;
    margin-bottom: 60px;
    backdrop-filter: blur(5px);
    border: 1px solid var(--border);
  }

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

  .image-card {
    position: relative;
    height: 300px;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s, box-shadow 0.3s;
  }

  .image-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.4);
  }

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

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

  pre {
    background: rgba(0, 0, 0, 0.5);
    padding: 20px;
    border-radius: 10px;
    overflow-x: auto;
    margin: 20px 0;
    border-left: 4px solid var(--accent);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
    position: relative;
  }

  pre::before {
    content: 'CSS';
    position: absolute;
    top: 0;
    right: 0;
    background: var(--accent);
    color: #000;
    padding: 2px 10px;
    font-size: 0.8rem;
    border-bottom-left-radius: 5px;
  }

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

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

  .card {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 15px;
    backdrop-filter: blur(5px);
    border: 1px solid var(--border);
    transition: transform 0.3s, box-shadow 0.3s;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
  }

  .card:hover {
    transform: translateY(-10px) rotateY(10deg);
    box-shadow: 0 20px 30px rgba(0, 0, 0, 0.3);
  }

  .card h4 {
    margin-bottom: 15px;
    color: var(--accent);
  }

  .navbar {
    position: fixed;
    top: 0;
    width: 100%;
    height: 70px;
    background: rgba(13, 71, 161, 0.9);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
  }

  .navbar:hover {
    background: rgba(13, 71, 161, 1);
    box-shadow: 0 6px 40px rgba(0, 0, 0, 0.4);
  }

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

  .nav-links a {
    color: #fff;
    text-decoration: none;
    font-weight: 500;
    position: relative;
    padding: 5px 0;
    transition: color 0.3s;
  }

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

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

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

  .sidebar {
    position: fixed;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(13, 71, 161, 0.8);
    border-radius: 0 15px 15px 0;
    padding: 20px 10px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    z-index: 999;
    backdrop-filter: blur(5px);
    transition: all 0.3s ease;
  }

  .sidebar:hover {
    background: rgba(13, 71, 161, 0.9);
    padding: 20px 15px;
  }

  .sidebar a {
    color: #fff;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: all 0.3s;
    padding: 8px 12px;
    border-radius: 5px;
  }

  .sidebar a:hover {
    background: rgba(255, 255, 255, 0.2);
    color: var(--accent);
  }

  .sidebar i {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  footer {
    text-align: center;
    padding: 30px 0;
    margin-top: 60px;
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(5px);
  }

  @media (max-width: 768px) {
    .navbar {
      height: 60px;
    }
    
    .nav-links {
      gap: 15px;
    }
    
    .hero {
      height: 300px;
    }
    
    .sidebar {
      display: none;
    }
    
    article {
      padding: 20px;
    }
    
    h1 {
      font-size: 2rem;
    }
    
    h2 {
      font-size: 1.5rem;
    }
    
    h3 {
      font-size: 1.3rem;
    }
  }

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

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

  .dashboard-container {
    perspective: 1000px;
    width: 300px;
    height: 300px;
    margin: 40px auto;
  }

  .dashboard {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    animation: rotateDashboard 20s infinite linear;
  }

  @keyframes rotateDashboard {
    from { transform: rotateY(0deg); }
    to { transform: rotateY(360deg); }
  }

  .dashboard-face {
    position: absolute;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--border);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    backface-visibility: hidden;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.3);
  }

  .dashboard-face:nth-child(1) { transform: rotateY(0deg) translateZ(150px); }
  .dashboard-face:nth-child(2) { transform: rotateY(90deg) translateZ(150px); }
  .dashboard-face:nth-child(3) { transform: rotateY(180deg) translateZ(150px); }
  .dashboard-face:nth-child(4) { transform: rotateY(270deg) translateZ(150px); }

  .geo-shape {
    position: absolute;
    width: 200px;
    height: 200px;
    background: rgba(255, 255, 255, 0.05);
    transform: rotateY(45deg) rotateX(20deg);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(5px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    z-index: -1;
  }

  .shape-1 {
    top: 10%;
    left: 10%;
    animation: float 8s ease-in-out infinite;
  }

  .shape-2 {
    bottom: 10%;
    right: 10%;
    animation: float 7s ease-in-out infinite 2s;
  }

  .wave-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 200%;
    height: 100%;
    background: url('https://images.gptkong.com/demo/sample2.png') repeat-x;
    opacity: 0.1;
    z-index: -2;
    animation: waveAnimation 20s linear infinite;
  }

  @keyframes waveAnimation {
    from { transform: translateX(0); }
    to { transform: translateX(-50%); }
  }