:root {
  --mono: 'SF Mono', ui-monospace, Menlo, Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
  --sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

body {
  margin: 0;
  min-height: 100vh;
  background-color: #0a0a0a;
  color: #ededed;
  font-family: var(--mono);
}

.page {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.head-title {
  margin: 0;
  padding: 40px 20px 28px;
  color: #f4f4f4;
  font-family: var(--mono);
  font-size: 40px;
  font-weight: 600;
  letter-spacing: -0.02em;
  text-align: center;
}

.copyright {
  margin: 24px 0 40px;
  color: #8a8a8a;
  font-family: var(--sans);
  font-size: 12px;
  text-align: center;
}

.avatar {
  width: 14px;
  height: 14px;
  margin: 0 6px;
  border-radius: 50%;
  vertical-align: middle;
  filter: grayscale(1);
}

.beian {
  margin-top: 10px;
  color: #8a8a8a;
  font-size: 10px;
  text-decoration: none;
}

@media only screen and (max-width: 640px) {
  .head-title {
    font-size: 30px;
  }
}