body {
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: #DCFCE7;
    color: #1F2937;
    padding: 16px;
  }
  @media (min-width: 640px) {
    body { padding: 24px; }
  }
  @media (min-width: 768px) {
    body { padding: 32px; }
  }
  .container {
    min-height: 100vh;
    padding-top: 64px;
  }
  @media (min-width: 640px) {
    .container { padding-top: 80px; }
  }
  nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: #34D399;
    padding: 8px;
    border-radius: 0.5rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    z-index: 50;
  }
  @media (min-width: 640px) {
    nav { padding: 16px; }
  }
  nav h3 {
    font-size: 1.25rem;
    color: #065F46;
    margin-bottom: 8px;
    text-align: center;
  }
  @media (min-width: 640px) {
    nav h3 { font-size: 1.5rem; margin-bottom: 12px; }
  }
  nav ul {
    display: flex;
    flex-direction: column;
    gap: 8px;
    justify-content: center;
    text-align: center;
    list-style: none;
    padding: 0;
    margin: 0;
  }
  @media (min-width: 640px) {
    nav ul {
      flex-direction: row;
      gap: 24px;
      flex-wrap: wrap;
    }
  }
  nav a {
    font-size: 1rem;
    color: #065F46;
    font-weight: bold;
    text-decoration: none;
    display: block;
  }
  nav a:hover {
    text-decoration: underline;
  }
  @media (min-width: 640px) {
    nav a { font-size: 1.125rem; display: inline-block; }
  }
  header {
    text-align: center;
    background-color: #047857;
    color: white;
    padding: 32px;
    margin-top: 64px;
    border-radius: 0.5rem;
    margin-bottom: 24px;
  }
  @media (min-width: 640px) {
    header { margin-top: 80px; }
  }
  header h1 {
    font-size: 1.875rem;
    font-weight: bold;
    margin: 0;
  }
  @media (min-width: 640px) {
    header h1 { font-size: 2.25rem; }
  }
  header p {
    margin-top: 8px;
    font-size: 1.125rem;
  }
  section {
    background-color: #F0FDF4;
    padding: 16px;
    border-radius: 0.5rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    margin-bottom: 24px;
  }
  @media (min-width: 640px) {
    section { padding: 24px; }
  }
  section h2 {
    font-size: 1.5rem;
    color: #047857;
    margin-bottom: 12px;
  }
  @media (min-width: 640px) {
    section h2 { font-size: 1.875rem; }
  }
  section img {
    width: 100%;
    max-width: 320px;
    height: auto;
    border-radius: 0.5rem;
    margin: 0 auto 12px;
    display: block;
  }
  @media (min-width: 640px) {
    section img { max-width: 384px; }
  }
  @media (min-width: 768px) {
    section img { max-width: 448px; }
  }
  section p {
    font-size: 1rem;
    margin-bottom: 12px;
  }
  @media (min-width: 640px) {
    section p { font-size: 1.125rem; }
  }
  section h3 {
    font-size: 1.25rem;
    color: #059669;
    margin-bottom: 12px;
  }
  @media (min-width: 640px) {
    section h3 { font-size: 1.5rem; }
  }
  section ul {
    list-style: disc;
    padding-left: 20px;
    font-size: 1rem;
  }
  @media (min-width: 640px) {
    section ul { font-size: 1.125rem; }
  }
  section a {
    color: #16A34A;
    text-decoration: none;
  }
  section a:hover {
    text-decoration: underline;
  }
  section strong {
    font-weight: bold;
  }
  footer {
    text-align: center;
    background-color: #047857;
    color: white;
    padding: 16px;
    border-radius: 0.5rem;
  }
  footer p {
    margin: 4px 0;
  }
  footer a {
    color: #D1FAE5;
    text-decoration: none;
  }
  footer a:hover {
    text-decoration: underline;
  }