:root {
    --primary: #0a192f;
    --secondary: #112240;
    --accent: #64ffda;
    --text: #ccd6f6;
    --highlight: #00c6ff;
    --gradient: linear-gradient(135deg, #0a192f, #1a1a2e);
  }

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

  @font-face {
    font-family: 'Roboto';
    src: url('https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700&display=swap');
  }

  @font-face {
    font-family: 'Montserrat';
    src: url('https://fonts.googleapis.com/css2?family=Montserrat:wght@300;400;600;700&display=swap');
  }

  body {
    background: var(--gradient);
    color: var(--text);
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100%;
    padding-bottom: 50px;
  }

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

  .header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(10, 25, 47, 0.9);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 15px 0;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
  }

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

  .nav-logo {
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--accent);
    text-decoration: none;
  }

  .nav-menu {
    display: flex;
    list-style: none;
  }

  .nav-item {
    margin-left: 30px;
    position: relative;
  }

  .nav-link {
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    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 ease;
  }

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

  .hero {
    padding: 150px 0 80px;
    text-align: center;
    position: relative;
  }

  .hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 50% 50%, rgba(100, 255, 218, 0.1) 0%, transparent 70%);
    z-index: -1;
  }

  .hero-title {
    font-family: 'Montserrat', sans-serif;
    font-size: 3.5rem;
    margin-bottom: 20px;
    background: linear-gradient(45deg, #00c6ff, #0072ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: textGlow 3s ease-in-out infinite alternate;
  }

  @keyframes textGlow {
    from {
      text-shadow: 0 0 10px rgba(0, 198, 255, 0.3);
    }
    to {
      text-shadow: 0 0 20px rgba(0, 198, 255, 0.6), 0 0 30px rgba(0, 114, 255, 0.4);
    }
  }

  .hero-subtitle {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto 40px;
    color: rgba(204, 214, 246, 0.8);
  }

  .notice {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(5px);
    border-radius: 8px;
    padding: 15px;
    margin: 30px auto;
    max-width: 800px;
    text-align: center;
    border-left: 3px solid var(--accent);
    animation: pulse 2s infinite;
  }

  @keyframes pulse {
    0% {
      box-shadow: 0 0 0 0 rgba(100, 255, 218, 0.4);
    }
    70% {
      box-shadow: 0 0 0 10px rgba(100, 255, 218, 0);
    }
    100% {
      box-shadow: 0 0 0 0 rgba(100, 255, 218, 0);
    }
  }

  .content-section {
    padding: 60px 0;
  }

  .section-title {
    font-family: 'Montserrat', sans-serif;
    font-size: 2.2rem;
    margin-bottom: 30px;
    position: relative;
    display: inline-block;
  }

  .section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 50%;
    height: 3px;
    background: var(--accent);
  }

  article {
    background: rgba(17, 34, 64, 0.7);
    backdrop-filter: blur(5px);
    border-radius: 15px;
    padding: 40px;
    margin: 40px 0;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  }

  article h2 {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.8rem;
    margin: 30px 0 20px;
    color: var(--accent);
  }

  article h3 {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.5rem;
    margin: 25px 0 15px;
    color: #00c6ff;
  }

  article p {
    margin-bottom: 20px;
    font-size: 1.1rem;
    line-height: 1.7;
  }

  pre {
    background: rgba(10, 25, 47, 0.8);
    border-radius: 8px;
    padding: 20px;
    margin: 20px 0;
    overflow-x: auto;
    font-size: 0.9rem;
    border-left: 4px solid var(--accent);
    position: relative;
  }

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

  code {
    font-family: 'Roboto Mono', monospace;
    color: #64ffda;
  }

  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin: 40px 0;
  }

  .image-card {
    position: relative;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }

  .image-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 198, 255, 0.3);
  }

  .image-card img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.5s ease;
  }

  .image-card:hover img {
    transform: scale(1.05);
  }

  .image-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(10, 25, 47, 0.9), transparent);
    padding: 20px;
    color: white;
    transform: translateY(100%);
    transition: transform 0.3s ease;
  }

  .image-card:hover .image-overlay {
    transform: translateY(0);
  }

  .footer {
    background: rgba(10, 25, 47, 0.9);
    backdrop-filter: blur(5px);
    padding: 30px 0;
    margin-top: 60px;
    text-align: center;
  }

  .footer-text {
    color: rgba(204, 214, 246, 0.7);
    font-size: 0.9rem;
  }

  @media (max-width: 768px) {
    .hero-title {
      font-size: 2.5rem;
    }
    
    .nav-menu {
      display: none;
    }
    
    article {
      padding: 30px 20px;
    }
    
    .image-grid {
      grid-template-columns: 1fr;
    }
  }

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

  .particle {
    position: absolute;
    width: 2px;
    height: 2px;
    background: var(--accent);
    border-radius: 50%;
    opacity: 0;
    animation: particleMove 10s linear infinite;
  }

  @keyframes particleMove {
    0% {
      transform: translate(0, 0);
      opacity: 0;
    }
    10% {
      opacity: 1;
    }
    90% {
      opacity: 1;
    }
    100% {
      transform: translate(var(--x), var(--y));
      opacity: 0;
    }
  }

  /* Scroll indicator */
  .scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 4px;
    background: var(--accent);
    z-index: 1000;
    transition: width 0.1s ease;
  }

  /* Fade-in animation */
  .fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
  }

  .fade-in.visible {
    opacity: 1;
    transform: translateY(0);
  }

  /* Tooltip */
  .tooltip {
    position: relative;
    display: inline-block;
    border-bottom: 1px dotted var(--accent);
    cursor: help;
  }

  .tooltip .tooltiptext {
    visibility: hidden;
    width: 200px;
    background-color: var(--secondary);
    color: var(--text);
    text-align: center;
    border-radius: 6px;
    padding: 10px;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    transition: opacity 0.3s;
    font-size: 0.9rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
  }

  .tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
  }

  /* Accordion */
  .accordion {
    background: rgba(17, 34, 64, 0.7);
    color: var(--text);
    cursor: pointer;
    padding: 18px;
    width: 100%;
    border: none;
    text-align: left;
    outline: none;
    font-size: 1.1rem;
    transition: 0.4s;
    margin: 10px 0;
    border-radius: 8px;
    position: relative;
  }

  .accordion:after {
    content: '+';
    color: var(--accent);
    font-weight: bold;
    float: right;
    margin-left: 5px;
    transition: transform 0.3s ease;
  }

  .active:after {
    content: '-';
  }

  .panel {
    padding: 0 18px;
    background-color: rgba(10, 25, 47, 0.5);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.2s ease-out;
    border-radius: 0 0 8px 8px;
    margin-bottom: 20px;
  }