:root {
  color-scheme: light;
  --page-bg: #ffffff;
  --text: #202124;
  --muted: #5f6368;
  --heading: #172126;
  --link: #146c5a;
  --link-hover: #a53724;
  --border: #d9dee3;
  --soft-bg: #f4f6f7;
  --quote-border: #d0d7de;
  --content-width: 920px;
  --body-font: Arial, Helvetica, "Liberation Sans", "Nimbus Sans L", "Microsoft YaHei", "Microsoft YaHei UI", SimHei, "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", "Noto Sans SC", "Source Han Sans SC", "Heiti SC", "WenQuanYi Micro Hei", sans-serif;
  --code-font: "Cascadia Mono", "Cascadia Code", Consolas, "Liberation Mono", Menlo, monospace;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--page-bg);
  color: var(--text);
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--page-bg);
  color: var(--text);
  font-family: var(--body-font);
  font-size: 1rem;
  line-height: 1.75;
  overflow-wrap: break-word;
}

.article-shell {
  width: min(100%, var(--content-width));
  margin: 0 auto;
  padding: 36px 34px 72px;
}

.article-content {
  min-width: 0;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  color: var(--heading);
  font-weight: 700;
  line-height: 1.35;
  margin: 1.6em 0 0.65em;
}

h1 {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 0;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid var(--border);
  font-size: 2rem;
}

.article-logo {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  width: 84px;
  height: 84px;
  margin: 0;
}

.article-logo img {
  display: block;
  width: 84px;
  height: 84px;
  object-fit: contain;
}

.article-publication-meta {
  width: 100%;
  margin: -0.25rem 0 2rem;
  color: var(--muted);
  font-size: 0.8125rem;
  line-height: 1.7;
  text-align: right;
}

.article-author-line {
  color: #303942;
}

.article-publication-dates time {
  font-variant-numeric: tabular-nums;
}

h2 {
  font-size: 1.55rem;
}

h3 {
  font-size: 1.3rem;
}

h4 {
  font-size: 1.12rem;
}

p,
ul,
ol,
blockquote,
pre,
table,
figure {
  margin-top: 0;
  margin-bottom: 1.1rem;
}

a {
  color: var(--link);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--link-hover);
}

a:focus-visible {
  outline: 2px solid var(--link-hover);
  outline-offset: 3px;
}

img,
video,
canvas,
svg {
  max-width: 100%;
}

img {
  display: block;
  margin-right: auto;
  margin-left: auto;
  height: auto;
  vertical-align: middle;
}

.article-content a:has(> img:only-child):not(.article-logo) {
  display: block;
  width: fit-content;
  max-width: 100%;
  margin-right: auto;
  margin-left: auto;
}

.article-content .article-logo {
  display: flex;
  width: 84px;
  max-width: none;
  margin: 0;
}

figure {
  margin-left: 0;
  margin-right: 0;
}

figcaption {
  margin-top: 0.45rem;
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
}

blockquote {
  margin-left: 0;
  padding: 0.1rem 0 0.1rem 1rem;
  border-left: 3px solid var(--quote-border);
  color: #6a737d;
  background: transparent;
}

blockquote > :last-child {
  margin-bottom: 0;
}

mark {
  padding: 0 0.08em;
  color: inherit;
  background: #fff3a3;
}

code,
kbd,
samp,
pre {
  font-family: var(--code-font);
}

code {
  padding: 0.12em 0.32em;
  border-radius: 3px;
  background: var(--soft-bg);
  font-size: 0.9em;
}

pre {
  max-width: 100%;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--soft-bg);
  overflow-x: auto;
  line-height: 1.55;
}

pre code {
  padding: 0;
  background: transparent;
  font-size: 0.9rem;
}

table {
  display: block;
  width: max-content;
  max-width: 100%;
  margin-right: auto;
  margin-left: auto;
  border-collapse: collapse;
  overflow-x: auto;
}

th,
td {
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--soft-bg);
}

hr {
  margin: 2rem 0;
  border: 0;
  border-top: 1px solid var(--border);
}

.math.display {
  display: block;
  width: 100%;
  max-width: 100%;
  overflow: visible;
  padding: 0.35rem 0;
}

mjx-container[display="true"] {
  display: block;
  width: 100% !important;
  min-width: 0 !important;
  max-width: 100%;
  overflow: visible;
  padding: 0;
}

.math.inline,
mjx-container:not([display="true"]) {
  max-width: 100%;
}

.article-content > p[align="right"] {
  color: var(--muted);
  font-size: 0.95rem;
}

@media (max-width: 640px) {
  .article-shell {
    padding: 24px 18px 52px;
  }

  h1 {
    font-size: 1.65rem;
  }

  h2 {
    font-size: 1.35rem;
  }

  .article-logo,
  .article-content .article-logo,
  .article-logo img {
    width: 68px;
    height: 68px;
  }

  .article-publication-meta {
    margin: -0.1rem 0 1.65rem;
    font-size: 0.75rem;
  }
}

@media print {
  .article-shell {
    width: 100%;
    padding: 0;
  }

  a {
    color: inherit;
  }
}