:root {
  color-scheme: dark light;
  --bg: #0c1117;
  --panel: #131b24;
  --panel-soft: #192430;
  --text: #e6edf3;
  --muted: #9aa8b7;
  --line: #2a3948;
  --accent: #69d3c4;
  --accent-strong: #a6eee3;
  --code: #091016;
  --max: 78rem;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f5f3ed;
    --panel: #fffefa;
    --panel-soft: #ece9df;
    --text: #172026;
    --muted: #52616b;
    --line: #cbc8bd;
    --accent: #087d70;
    --accent-strong: #075f56;
    --code: #172026;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 Georgia, "Noto Serif", "Noto Sans SC", "PingFang SC",
    "Noto Sans CJK SC", "Source Han Sans SC", "Noto Sans Devanagari",
    "Noto Naskh Arabic", "Noto Sans Arabic", "Times New Roman", serif;
}
a { color: var(--accent-strong); }
a:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
.skip-link { position: absolute; left: -9999px; top: 0; }
.skip-link:focus { left: 1rem; top: 1rem; z-index: 10; background: var(--panel); padding: .75rem; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .65rem 1rem;
  padding: .85rem max(1rem, calc((100vw - var(--max)) / 2));
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(10px);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
.site-header a { color: var(--text); font-weight: 800; text-decoration: none; letter-spacing: .04em; }
.site-header span { color: var(--muted); }
.langs {
  margin-inline-start: auto;
  display: flex;
  flex-wrap: wrap;
  gap: .3rem .75rem;
  font-size: .78rem;
}
.langs a { font-weight: 500; color: var(--muted); letter-spacing: 0; }
.langs a[aria-current="page"] { color: var(--accent-strong); font-weight: 800; }
html[dir="rtl"] .langs { margin-inline-start: 0; margin-inline-end: auto; }
html[dir="rtl"] blockquote { border-left: 0; border-right: 4px solid var(--accent); }
html[dir="rtl"] .sidebar a { border-left: 0; border-right: 2px solid transparent; }
html[dir="rtl"] .sidebar a:hover,
html[dir="rtl"] .sidebar a.active { border-right-color: var(--accent); }
html[dir="rtl"] pre,
html[dir="rtl"] code {
  direction: ltr;
  unicode-bidi: isolate;
  text-align: left;
}
html[dir="rtl"] pre {
  border-left: 4px solid var(--accent);
  border-right: 0;
}
html[dir="rtl"] .anchor { margin-left: 0; margin-right: .45rem; }
.layout {
  display: grid;
  grid-template-columns: 16rem minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  max-width: var(--max);
  margin: 0 auto;
  padding: 2rem 1.25rem 5rem;
}
.sidebar { position: sticky; top: 5rem; align-self: start; max-height: calc(100vh - 6rem); overflow: auto; }
.sidebar section { margin-bottom: 1.25rem; }
.sidebar h2 { margin: 0 0 .35rem; color: var(--muted); font: 700 .72rem/1.2 ui-monospace, monospace; letter-spacing: .12em; text-transform: uppercase; }
.sidebar ul { list-style: none; margin: 0; padding: 0; }
.sidebar li { margin: .12rem 0; }
.sidebar a { display: block; padding: .32rem .55rem; border-left: 2px solid transparent; color: var(--muted); font-family: ui-sans-serif, system-ui, sans-serif; text-decoration: none; }
.sidebar a:hover, .sidebar a.active { border-color: var(--accent); color: var(--text); background: color-mix(in srgb, var(--accent) 9%, transparent); }
main { min-width: 0; }
h1, h2, h3, h4 { font-family: ui-sans-serif, system-ui, sans-serif; line-height: 1.2; }
h1 { margin: 0 0 1.5rem; font-size: clamp(2.25rem, 7vw, 4.5rem); letter-spacing: -.045em; }
h2 { margin-top: 2.8rem; padding-top: .5rem; border-top: 1px solid var(--line); }
h3 { margin-top: 2rem; }
.anchor { margin-left: .45rem; opacity: 0; font-size: .7em; text-decoration: none; }
h1:hover .anchor, h2:hover .anchor, h3:hover .anchor, .anchor:focus { opacity: .55; }
p, li { max-width: 74ch; }
pre, code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
code { padding: .12em .32em; border-radius: .25rem; background: var(--panel-soft); font-size: .9em; }
pre { overflow: auto; margin: 1.25rem 0; padding: 1rem 1.2rem; border: 1px solid var(--line); border-left: 4px solid var(--accent); border-radius: .35rem; background: var(--code); color: #e6edf3; }
pre code { padding: 0; background: transparent; color: inherit; }
blockquote { margin: 1.25rem 0; padding: .25rem 1rem; border-left: 4px solid var(--accent); background: var(--panel); }
.table-scroll { overflow-x: auto; margin: 1.25rem 0; }
table { width: 100%; border-collapse: collapse; font-family: ui-sans-serif, system-ui, sans-serif; font-size: .91rem; }
th, td { padding: .65rem .8rem; border: 1px solid var(--line); text-align: left; vertical-align: top; }
th { background: var(--panel-soft); }
hr { margin: 3rem 0; border: 0; border-top: 1px solid var(--line); }
img { max-width: 100%; height: auto; }

@media (max-width: 760px) {
  .layout { grid-template-columns: 1fr; padding-top: 1rem; }
  .sidebar { position: static; max-height: none; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .5rem 1rem; }
  .site-header { padding-inline: 1rem; }
  h1 { font-size: 2.5rem; }
}

@media (max-width: 440px) {
  .sidebar { grid-template-columns: 1fr; }
  .site-header span { display: none; }
}