*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue',
    Arial, 'Noto Sans', 'Liberation Sans', sans-serif;
  background-color: #f5f5f5;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

/* 确保footer导航文本没有空格 */
.footer-nav div {
  letter-spacing: 0 !important;
  word-spacing: 0 !important;
}