:root {
  --link: #0071bc;
  --link-hover: #208799;
  --text: #222;
  --muted: #666;
}

* {
  box-sizing: border-box
}

html,
body {
  margin: 0;
  padding: 0;
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial
}

a:link,
a:visited {
  color: var(--link);
  text-decoration: none
}

a:hover {
  color: var(--link-hover);
  text-decoration: none
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 16px
}

.header {
  font-family: Arial;
  padding: 2rem 1rem
}

.img-fluid {
  max-width: 100%;
  height: auto
}

.row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  margin-left: -8px;
  margin-right: -8px
}

[class^="col-"],
[class*=" col-"] {
  padding-left: 8px;
  padding-right: 8px
}

.col-md-3,
.col-md-9 {
  width: 100%
}

@media(min-width:768px) {
  .col-md-3 {
    width: 25%
  }

  .col-md-9 {
    width: 75%
  }
}

.align-items-center {
  align-items: center
}

.align-column-center {
  display: flex;
  flex-direction: column;
  justify-content: center
}

.avatar {
  display: block;
  margin: 0 auto 5px;
  border-radius: 20px;
  border: 1px solid #ddd;
}

hr {
  border: 0;
  height: 1px;
  background-image: linear-gradient(to right, rgba(0, 113, 188, 0.2), rgba(0, 0, 0, 0.1), rgba(0, 113, 188, 0.2));
  margin: 20px 0
}

.gap-20 {
  height: 20px
}

.gap-10 {
  height: 10px
}

.section-div {
  height: 3em
}

.content-div {
  height: 2em
}

.small-div {
  height: .5em
}

code {
  background: rgba(0, 0, 0, .05);
  padding: 0 4px;
  border-radius: 4px
}

h2 {
  margin: 0 0 4px
}

h3 {
  margin: 16px 0 8px
}

ul {
  padding-left: 20px
}

.no-bullet {
  list-style: none;
  margin-left: 0
}

.paper {
  margin: 16px 0
}

.paper b {
  font-size: 1.05rem
}

.muted {
  color: var(--muted)
}

.zh-name {
  font-family: "STKaiti", "KaiTi", "KaiTi_GB2312", "Songti SC", "Noto Serif SC", "SimSun", serif;
  font-weight: 600;
  color: #333;
  text-shadow: 1px 1px 2px rgba(0, 0, 0, .4);
  margin-left: .35rem;
  letter-spacing: .02em;
  font-size: 0.95em;
}

.paper-wrap {
  margin: 16px 0;
}

.paper-thumb {
  width: 100%;
  display: block;
  border-radius: 10px;
  border: 1px solid #ddd;
  object-fit: cover;
  aspect-ratio: 4 / 3;
}

@media (max-width: 767px) {
  .paper-thumb {
    margin-bottom: 8px;
  }
}