body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 0;
  background: #f4f6f8;
  color: #333;
}

header {
  background-color: #007acc;
  color: white;
  text-align: center;
  padding: 2em 1em;
}

h1 .highlight {
  color: #ffe600;
}

.profile-photo {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
  margin: 0 auto 1.5em auto; /* 居中并下边距 */
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

section {
  background: white;
  max-width: 800px;
  margin: 2em auto;
  padding: 2em;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

footer {
  text-align: center;
  color: #666;
  font-size: 0.9em;
  padding: 2em 1em;
}