body {
  font-family: Arial, Helvetica, sans-serif;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  margin: 0;
  padding: 0;
  font-size: 1.1rem;
}

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

a:link,
a:visited {
  color: inherit;
  /* 继承父元素颜色 */
  text-decoration: none;
}

nav {
  display: flex;
  gap: 1.5rem; 
  flex-wrap: wrap;
}

header {
  background: linear-gradient(to right, #5f91ec, #5fb4ec);
  color: white;
  padding: 2rem;
  margin-bottom: 1rem;
}

header .container {
  display: flex;
  /* 启用 Flexbox 布局 */
  justify-content: space-between;
  /* 子元素两端对齐 */
  align-items: center;
  /* 子元素垂直居中 */
}

header nav {
  font-weight: bold;
}

main {
  /* 让main元素占据所有剩余的垂直空间，从而将footer推到底部 */
  flex: 1;
  padding: 0.5rem 2rem;
}

main a {
  color: #0059ff !important;
}

main h1 {
  font-size: 2.2rem;
  margin: 2rem 0;
}

footer {
  background: linear-gradient(to right, #5f91ec, #5fb4ec);
  color: #eee;
  padding: 2rem;
}

footer nav {
  margin: 0.5rem 0;
}

table {
  margin-bottom: 1rem;
  border-bottom: 1px solid #ddd;
  border-right: 1px solid #ddd;
  border-spacing: 0;
}

table th {
  padding: 0.2rem 0.8rem;
  border-top: 1px solid #ddd;
  border-left: 1px solid #ddd;
  font-weight: bold;
  background-color: #f9f9f9;
}

table td {
  padding: 0.2rem 0.8rem;
  border-top: 1px solid #ddd;
  border-left: 1px solid #ddd;
  white-space: nowrap;
}

code {
  padding: 2px 6px;
  background-color: #eee;
  border: 1px solid #eee;
  border-radius: 4px;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
}

pre {
  padding: 0.8rem 1rem;
  background-color: #eee;
  border: 1px solid #ddd;
  border-radius: 7px;
  white-space: pre-wrap;
  word-wrap: break-word;
}

hr {
  margin: 2rem 0;
}

blockquote {
  margin: 1rem 0;
  padding: 0.1rem 1rem;
  border-left: 4px solid #5f91ec;
  background-color: #f5f5f5;
}

@media (max-width: 600px) {
  nav {
    flex-direction: column; 
    gap: 0.1rem;
  }
}