:root {
    --primary: #0d47a1;
    --secondary: #1976d2;
    --accent: #ff9800;
    --success: #4caf50;
    --bg-gradient: linear-gradient(135deg, var(--primary), var(--secondary));
    --text-light: #ffffff;
    --text-dark: #333333;
    --card-bg: rgba(255, 255, 255, 0.1);
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  }

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

  body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.8;
    color: var(--text-light);
    background: var(--bg-gradient);
    min-height: 100%;
    overflow-x: hidden;
  }

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

  .header {
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
  }

  .header::after {
    content: '';
    display: block;
    width: 100px;
    height: 4px;
    background: var(--accent);
    margin: 1.5rem auto;
    border-radius: 2px;
  }

  h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  }

  h3 {
    font-size: 1.8rem;
    margin: 2rem 0 1rem;
    color: var(--accent);
    position: relative;
    padding-left: 1rem;
  }

  h3::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 80%;
    background: var(--accent);
    border-radius: 2px;
  }

  p {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    max-width: 800px;
  }

  span {
    color: var(--accent);
    font-weight: bold;
  }

  .card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    padding: 2rem;
    margin: 2rem 0;
    box-shadow: var(--shadow);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: transform 0.3s, box-shadow 0.3s;
  }

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

  pre {
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
    padding: 1.5rem;
    margin: 1.5rem 0;
    overflow-x: auto;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    border-left: 4px solid var(--accent);
  }

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

  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
  }

  .image-card {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.3s;
  }

  .image-card:hover {
    transform: scale(1.03);
  }

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

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

  .image-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, transparent, rgba(0, 0, 0, 0.7));
    opacity: 0;
    transition: opacity 0.3s;
  }

  .image-card:hover::after {
    opacity: 1;
  }

  .notice {
    background: rgba(255, 255, 255, 0.2);
    padding: 1rem;
    border-radius: 8px;
    margin: 2rem 0;
    text-align: center;
    font-weight: bold;
    border-left: 4px solid var(--accent);
  }

  @media (max-width: 768px) {
    .container {
      padding: 1rem;
    }

    h2 {
      font-size: 2rem;
    }

    h3 {
      font-size: 1.5rem;
    }

    .image-grid {
      grid-template-columns: 1fr;
    }
  }

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

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

  /* Navigation */
  .nav-links {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    display: flex;
    gap: 1rem;
  }

  .nav-link {
    color: var(--text-light);
    text-decoration: none;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    transition: background 0.3s;
  }

  .nav-link:hover {
    background: rgba(255, 255, 255, 0.2);
  }

  /* Theme toggle */
  .theme-toggle {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgba(255, 255, 255, 0.1);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 1000;
    transition: background 0.3s;
  }

  .theme-toggle:hover {
    background: rgba(255, 255, 255, 0.2);
  }

  /* Section animations */
  section {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s, transform 0.5s;
  }

  section.visible {
    opacity: 1;
    transform: translateY(0);
  }