:root {
    --primary: #0f2027;
    --secondary: #203a43;
    --accent: #1E90FF;
    --highlight: #63A4FF;
    --text: #FFFFFF;
    --shadow: rgba(0, 0, 0, 0.2);
  }

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

  body {
    font-family: 'Roboto', sans-serif;
    color: var(--text);
    background: linear-gradient(135deg, var(--primary), var(--secondary), #2c5364);
    line-height: 1.6;
    overflow-x: hidden;
  }

  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
  }

  header {
    text-align: center;
    padding: 3rem 0;
    position: relative;
    overflow: hidden;
  }

  header::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: 0.1;
    z-index: -1;
  }

  h1, h2, h3 {
    font-weight: 700;
    margin-bottom: 1.5rem;
    text-shadow: 0 2px 4px var(--shadow);
  }

  h1 {
    font-size: 3rem;
    background: linear-gradient(90deg, var(--accent), var(--highlight));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }

  h2 {
    font-size: 2.2rem;
    color: var(--highlight);
    position: relative;
    padding-bottom: 1rem;
  }

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

  h3 {
    font-size: 1.8rem;
    color: var(--accent);
    margin-top: 2rem;
  }

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

  .grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
  }

  .grid-item {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
  }

  .grid-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
  }

  .image-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.5rem;
    margin: 2rem 0;
  }

  .image-box {
    width: 320px;
    height: 320px;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 15px var(--shadow);
    transition: all 0.3s ease;
  }

  .image-box:hover {
    transform: scale(1.05);
    box-shadow: 0 10px 25px rgba(30, 144, 255, 0.4);
  }

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

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

  pre {
    background: rgba(0, 0, 0, 0.3);
    border-radius: 10px;
    padding: 1.5rem;
    margin: 1.5rem 0;
    overflow-x: auto;
    border-left: 4px solid var(--accent);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
  }

  code {
    color: var(--highlight);
    background: rgba(30, 144, 255, 0.1);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
  }

  .button {
    display: inline-block;
    background: var(--accent);
    color: white;
    padding: 0.8rem 1.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(30, 144, 255, 0.3);
    margin: 1rem 0;
    border: none;
    cursor: pointer;
  }

  .button:hover {
    background: var(--highlight);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(30, 144, 255, 0.4);
  }

  .split-screen {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin: 2rem 0;
  }

  .split-left, .split-right {
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 15px var(--shadow);
  }

  .split-left {
    background: linear-gradient(135deg, var(--accent), #2C5364);
  }

  .split-right {
    background: linear-gradient(135deg, #2C5364, var(--primary));
  }

  .notice {
    background: rgba(255, 255, 255, 0.1);
    padding: 1.5rem;
    border-radius: 10px;
    margin: 2rem 0;
    border-left: 4px solid var(--highlight);
    text-align: center;
  }

  @media (min-width: 768px) {
    .split-screen {
      flex-direction: row;
    }
    
    .split-left, .split-right {
      width: 48%;
    }
  }

  @keyframes float {
    0%, 100% {
      transform: translateY(0);
    }
    50% {
      transform: translateY(-10px);
    }
  }

  .floating {
    animation: float 3s ease-in-out infinite;
  }

  .nav-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin: 2rem 0;
  }

  .nav-links a {
    color: var(--text);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 50px;
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.1);
  }

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

  .particle {
    position: absolute;
    width: 2px;
    height: 2px;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    animation: move 10s linear infinite;
    z-index: -1;
  }

  @keyframes move {
    0% {
      transform: translate(0, 0);
      opacity: 0;
    }
    10% {
      opacity: 1;
    }
    90% {
      opacity: 1;
    }
    100% {
      transform: translate(1000px, 500px);
      opacity: 0;
    }
  }