/* readlk.com 站点样式 */
:root {
  --fg: #1f2328;
  --muted: #59636e;
  --bg: #fdfdfb;
  --link: #0b5cad;
  --border: #d8dee4;
  --code-bg: #f3f4f1;
  --th-bg: #f1f3f5;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #e6e6e3;
    --muted: #9aa3ad;
    --bg: #16181b;
    --link: #7cb7ff;
    --border: #353a40;
    --code-bg: #23272c;
    --th-bg: #20242a;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  color: var(--fg);
  background: var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.8;
}

main, .site-header, .site-footer {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 20px;
}

.site-header { padding-top: 16px; padding-bottom: 8px; border-bottom: 1px solid var(--border); }
.brand { font-weight: 700; font-size: 18px; color: var(--fg); text-decoration: none; }
.site-footer { margin-top: 48px; padding-top: 16px; padding-bottom: 32px; border-top: 1px solid var(--border); color: var(--muted); font-size: 14px; }

a { color: var(--link); text-decoration: none; }
a:hover, a:focus { text-decoration: underline; }
a:focus-visible { outline: 2px solid var(--link); outline-offset: 2px; }

h1, h2, h3, h4 { line-height: 1.4; margin: 1.6em 0 0.6em; }
h1 { font-size: 1.7em; }
h2 { font-size: 1.35em; padding-bottom: 0.2em; border-bottom: 1px solid var(--border); }
h3 { font-size: 1.15em; }

p, ul, ol { margin: 0.8em 0; }
li + li { margin-top: 0.25em; }

blockquote { margin: 1em 0; padding: 0 1em; color: var(--muted); border-left: 4px solid var(--border); }

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: var(--code-bg);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}
pre { background: var(--code-bg); padding: 12px 16px; border-radius: 6px; overflow-x: auto; line-height: 1.5; }
pre code { background: none; padding: 0; }

.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; margin: 1em 0; }
table { border-collapse: collapse; min-width: 100%; font-size: 0.95em; }
th, td { border: 1px solid var(--border); padding: 6px 10px; text-align: left; vertical-align: top; }
th { background: var(--th-bg); white-space: nowrap; }

hr { border: 0; border-top: 1px solid var(--border); margin: 2em 0; }
img { max-width: 100%; height: auto; }

.crumbs { margin-top: 16px; font-size: 14px; color: var(--muted); }

.book-list, .doc-list { padding-left: 1.2em; }
.doc-list .num { color: var(--muted); font-variant-numeric: tabular-nums; }
.book-list p { margin: 0.2em 0 1em; color: var(--muted); font-size: 0.95em; }

.doc-nav {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 40px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  font-size: 15px;
}
.doc-nav > * { flex: 1; }
.doc-nav .toc-link { text-align: center; flex: 0 0 auto; }
.doc-nav [rel="next"] { text-align: right; }

@media (max-width: 600px) {
  body { font-size: 16px; }
  h1 { font-size: 1.45em; }
  .doc-nav { flex-direction: column; }
  .doc-nav > *, .doc-nav [rel="next"], .doc-nav .toc-link { text-align: left; }
}