:root {
    --primary: linear-gradient(135deg, #1E3C72, #2A5298, #6A11CB);
    --secondary: linear-gradient(45deg, #6A11CB, #2575FC);
    --accent: #E100FF;
    --light: #ffffff;
    --dark: #333333;
    --gray: #f5f7fa;
  }

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

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

  .header {
    position: relative;
    height: 80vh;
    min-height: 600px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 0 20px;
    background: var(--primary);
    color: var(--light);
    overflow: hidden;
  }

  .header::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('https://images.gptkong.com/demo/sample1.png'), 
                     url('https://images.gptkong.com/demo/sample2.png');
    background-size: 30%, 20%;
    background-position: 10% 20%, 90% 70%;
    background-repeat: no-repeat;
    opacity: 0.1;
    z-index: 0;
  }

  .header h1 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    position: relative;
    z-index: 1;
    background: linear-gradient(90deg, var(--light), #89f7fe);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: fadeIn 1.5s ease;
  }

  .header p {
    font-size: 1.2rem;
    max-width: 800px;
    margin-bottom: 2rem;
    position: relative;
    z-index: 1;
    opacity: 0.9;
  }

  .notice {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgba(0,0,0,0.7);
    color: white;
    padding: 10px 20px;
    border-radius: 30px;
    font-size: 0.9rem;
    z-index: 1000;
    backdrop-filter: blur(5px);
  }

  .navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 5%;
    z-index: 1000;
    backdrop-filter: blur(5px);
  }

  .navbar .logo {
    font-family: 'Roboto', sans-serif;
    font-weight: bold;
    font-size: 1.5rem;
    background: var(--secondary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .navbar .menu {
    display: flex;
    gap: 30px;
  }

  .navbar .menu a {
    color: var(--light);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
  }

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

  .navbar .menu a:hover {
    color: var(--accent);
  }

  .navbar .menu a:hover::after {
    width: 100%;
  }

  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 100px 5%;
  }

  article {
    background: white;
    border-radius: 20px;
    padding: 50px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    position: relative;
    overflow: hidden;
  }

  article::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 10px;
    background: var(--secondary);
  }

  h2, h3 {
    margin: 2rem 0 1rem;
    font-weight: 700;
    background: var(--secondary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  h2 {
    font-size: 2rem;
  }

  h3 {
    font-size: 1.5rem;
  }

  p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    line-height: 1.8;
  }

  span {
    font-weight: 700;
    background: var(--secondary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  pre {
    background: #1e1e1e;
    border-radius: 10px;
    padding: 20px;
    margin: 2rem 0;
    overflow: hidden;
    position: relative;
  }

  pre::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--accent);
  }

  code {
    font-family: 'Courier New', monospace;
    color: #f8f8f2;
    font-size: 0.9rem;
    line-height: 1.5;
    display: block;
    overflow-x: auto;
  }

  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin: 3rem 0;
  }

  .image-card {
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
  }

  .image-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.2);
  }

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

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

  .section-function {
    background: linear-gradient(to right, #89f7fe, #66a6ff);
    padding: 60px;
    margin: 3rem -50px;
    color: var(--dark);
    position: relative;
    overflow: hidden;
  }

  .section-security {
    background: linear-gradient(to right, #7F00FF, #E100FF);
    padding: 60px;
    margin: 3rem -50px;
    color: var(--light);
    position: relative;
    overflow: hidden;
  }

  .section-function::before, .section-security::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('https://images.gptkong.com/demo/sample3.png');
    background-size: 30%;
    background-position: 90% 50%;
    background-repeat: no-repeat;
    opacity: 0.1;
  }

  .chart-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 30px;
    margin: 3rem 0;
  }

  .chart {
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.05);
    transition: transform 0.3s ease;
  }

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

  .chart-header {
    font-size: 1.3rem;
    margin-bottom: 20px;
    background: var(--secondary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .chart-content {
    height: 250px;
    background: var(--gray);
    border-radius: 10px;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--dark);
    font-weight: bold;
  }

  .loading-bar-container {
    width: 100%;
    height: 5px;
    background: rgba(0,0,0,0.1);
    border-radius: 5px;
    margin: 3rem 0;
    overflow: hidden;
  }

  .loading-bar {
    width: 0;
    height: 100%;
    background: var(--secondary);
    animation: load 3s forwards;
  }

  footer {
    background: var(--dark);
    color: var(--light);
    padding: 50px 5%;
    text-align: center;
  }

  @keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
  }

  @keyframes load {
    from { width: 0; }
    to { width: 100%; }
  }

  @media (max-width: 768px) {
    .header h1 {
      font-size: 2.5rem;
    }

    .navbar .menu {
      display: none;
    }

    .navbar .hamburger {
      display: block;
    }

    article {
      padding: 30px;
    }

    .section-function, .section-security {
      padding: 40px 30px;
      margin: 2rem -30px;
    }
  }