/* common CSS file */

/* Root */
html,
body {
  margin: 0;
  padding: 0;
  font-size: 14px;
  font-family: '微软雅黑', Arial, Helvetica, sans-serif;
}
body {
  background-color: rgb(113, 191, 255);
  min-height: 100vh;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.25rem 1rem;
}

/* Header, footer */
header,
footer {
  background-color: #30a0ff;
  color: #ffffff;
}

/* Header */
header h1 {
  line-height: 1.2;
  font-size: 2rem;
}

/* Logo */
.logo {
  display: inline-block;
  border-radius: 50%;
  box-shadow: 0 0 0 2px #ffffff;
  width: 1.6em;
  height: 1.6em;
  line-height: 1.6;
  text-align: center;
  user-select: none;
}
.logo > span {
  position: relative;
  font-size: 0.5em;
  line-height: 1;
  display: inline-block;
  width: 100%;
  height: 1em;
  top: calc(-50% + 0.5em);
  left: 50%;
  transform: translateX(-50%) translateY(50%);
}
.first-header {
  font-size: 5rem;
  text-align: center;
}
.first-header .logo {
  box-shadow: 0 0 0 4px #bbbbbb;
}

/* Main */
main {
  min-height: 75vh;
}
main .container {
  margin: 1rem auto;
  background-color: #ffffff;
  border-radius: 4px;
}

/* Footer */
footer {
  margin: 0;
  padding: 0;
}

/* head */
h1,
h2,
h3,
h4,
h5 {
  font-variant: small-caps;
}

/* Link */
a {
  color: #3060df;
  text-decoration: none;
}