body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 18px;
  line-height: 1.8;
  background-color: #ffffff;
  color: #333333;
  margin: 0;
  padding: 2rem;
}

main {
  max-width: 720px;
  margin: 0 auto;
}

h1, h2, h3, h4, h5, h6 {
  color: #111111;
  margin-top: 2rem;
  margin-bottom: 1rem;
}

a {
  color: #c7254e;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

footer {
  margin-top: 4rem;
  padding-top: 2rem;
  font-size: 0.9rem;
  color: #666666;
  border-top: 1px solid #dddddd;
  text-align: center;
}

.avatar {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: 0 2px 5px rgba(0,0,0,0.15);
  margin-bottom: 1rem;
}