:root {
    --primary: #0f2027;
    --secondary: #203a43;
    --accent: #00FFFF;
    --text: #FFFFFF;
    --card-bg: rgba(255,255,255,0.1);
    --transition: all 0.3s ease;
  }

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

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

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

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

  header {
    padding: 30px 0;
    text-align: center;
    position: relative;
  }

  header::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 25%;
    width: 50%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
  }

  h1, h2, h3 {
    font-family: 'Fira Sans', sans-serif;
    color: var(--accent);
    margin: 1.5em 0 0.8em;
  }

  h1 { font-size: 2.5rem; }
  h2 { font-size: 2rem; }
  h3 { font-size: 1.5rem; }
  p { font-size: 1.1rem; margin-bottom: 1.5rem; }

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

  .card {
    background: var(--card-bg);
    border-radius: 15px;
    padding: 30px;
    transition: var(--transition);
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
    position: relative;
    overflow: hidden;
  }

  .card::before {
    content: "";
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(transparent, rgba(0,255,255,0.1), transparent);
    transform: rotate(45deg);
    transition: var(--transition);
    opacity: 0;
  }

  .card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.3);
  }

  .card:hover::before {
    opacity: 1;
    animation: shine 1.5s;
  }

  @keyframes shine {
    0% { transform: rotate(45deg) translate(-30%, -30%); }
    100% { transform: rotate(45deg) translate(30%, 30%); }
  }

  pre {
    background: rgba(0,0,0,0.3);
    border-radius: 10px;
    padding: 20px;
    margin: 20px 0;
    overflow: auto;
    font-family: monospace;
    border-left: 3px solid var(--accent);
  }

  code {
    color: var(--accent);
    font-family: monospace;
  }

  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin: 30px 0;
  }

  .image-item {
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    transition: var(--transition);
  }

  .image-item:hover {
    transform: scale(1.05);
    box-shadow: 0 10px 25px rgba(0,255,255,0.3);
  }

  .image-item img {
    width: 100%;
    height: auto;
    display: block;
    transition: var(--transition);
  }

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

  .notice {
    background: rgba(0,255,255,0.1);
    border-left: 4px solid var(--accent);
    padding: 15px;
    margin: 30px 0;
    border-radius: 0 5px 5px 0;
  }

  .particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
  }

  .particle {
    position: absolute;
    width: 2px;
    height: 2px;
    background: var(--accent);
    border-radius: 50%;
    opacity: 0.5;
    animation: float 15s infinite linear;
  }

  @keyframes float {
    0% { transform: translateY(0) translateX(0); opacity: 0; }
    10% { opacity: 0.5; }
    90% { opacity: 0.5; }
    100% { transform: translateY(-100vh) translateX(100px); opacity: 0; }
  }

  footer {
    text-align: center;
    padding: 30px 0;
    margin-top: 50px;
    border-top: 1px solid rgba(255,255,255,0.1);
  }

  @media (max-width: 768px) {
    .grid-container {
      grid-template-columns: 1fr;
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.7rem; }
    h3 { font-size: 1.3rem; }
  }