:root {
  --bg: #fbfaf7; --panel: #f3f1ec; --line: #e2ded6; --ink: #1d1b17; --dim: #5f5a51; --faint: #8f887c;
  --accent: #1f5e8a; --accent-ink: #164a6e; --ok: #2f7d4f; --warn: #a2681a; --bad: #b23a3a;
  --code-bg: #f0eee8; --sans: "IBM Plex Sans", "Noto Sans Devanagari", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace; --serif: "Source Serif 4", Georgia, serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #15171b; --panel: #1c1f25; --line: #2b303a; --ink: #e7e4dc; --dim: #a39d92; --faint: #6f6a61;
    --accent: #7fb4dc; --accent-ink: #a9cde8; --ok: #6cc08a; --warn: #d8a55a; --bad: #e07b7b; --code-bg: #1f232b; color-scheme: dark; }
}
* { box-sizing: border-box; }
html { font-size: 16px; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 400 1rem/1.6 var(--sans); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.shell { display: grid; grid-template-columns: 250px minmax(0, 1fr); min-height: 100vh; }
.side { position: sticky; top: 0; height: 100vh; overflow-y: auto; padding: 1.4rem 1.2rem; border-right: 1px solid var(--line); background: var(--panel); }
.brand { display: flex; align-items: baseline; gap: .5rem; margin-bottom: 1.2rem; color: var(--ink); }
.brand .mark { font: 600 1.35rem/1 var(--serif); }
.brand .ver { font: 500 .72rem/1 var(--mono); color: var(--accent); letter-spacing: .06em; }
.side h3 { margin: 1.1rem 0 .3rem; font: 500 .68rem/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--faint); }
.side ul { list-style: none; margin: 0; padding: 0; }
.side li a { display: block; padding: .28rem .5rem; border-radius: 6px; color: var(--dim); font-size: .92rem; }
.side li a:hover { background: var(--bg); color: var(--ink); text-decoration: none; }
.side li.here a { background: var(--bg); color: var(--ink); font-weight: 500; box-shadow: inset 3px 0 0 var(--accent); }
.page { display: grid; grid-template-columns: minmax(0, 72ch) 220px; gap: 3rem; padding: 2.4rem 3rem 5rem; }
article { min-width: 0; }
.toc { position: sticky; top: 2.4rem; align-self: start; font-size: .85rem; color: var(--dim); }
.toc h3 { margin: 0 0 .4rem; font: 500 .68rem/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--faint); }
.toc ul { list-style: none; margin: 0; padding: 0 0 0 .6rem; border-left: 1px solid var(--line); }
.toc ul ul { border: 0; padding-left: .8rem; }
.toc a { color: var(--dim); display: block; padding: .15rem 0; }
h1 { font: 600 2.1rem/1.15 var(--serif); margin: 0 0 1rem; letter-spacing: -.01em; text-wrap: balance; }
h2 { font: 600 1.45rem/1.25 var(--serif); margin: 2.4rem 0 .7rem; padding-top: .6rem; border-top: 1px solid var(--line); text-wrap: balance; }
h3 { font: 600 1.05rem/1.3 var(--sans); margin: 1.8rem 0 .5rem; }
h4 { font: 600 .95rem/1.3 var(--sans); margin: 1.4rem 0 .4rem; color: var(--dim); }
p, li { max-width: 72ch; }
blockquote { margin: 1rem 0; padding: .2rem 1rem; border-left: 3px solid var(--accent); color: var(--dim); font-style: italic; }
code { font: 400 .86em var(--mono); background: var(--code-bg); padding: .08em .35em; border-radius: 4px; }
pre { background: var(--code-bg); border: 1px solid var(--line); border-radius: 8px; padding: .9rem 1.1rem; overflow-x: auto; font: 400 .82rem/1.55 var(--mono); }
pre code { background: none; padding: 0; font-size: inherit; }
pre.mermaid { background: var(--panel); text-align: center; padding: 1rem .5rem; }
table { border-collapse: collapse; width: 100%; margin: 1rem 0; font-size: .9rem; display: block; overflow-x: auto; }
th, td { text-align: left; vertical-align: top; padding: .45rem .7rem; border-bottom: 1px solid var(--line); }
th { font-weight: 600; color: var(--dim); font-size: .8rem; letter-spacing: .04em; text-transform: uppercase; white-space: nowrap; }
td { font-variant-numeric: tabular-nums; }
hr { border: 0; border-top: 1px solid var(--line); margin: 2rem 0; }
strong { font-weight: 600; }
.tag, kbd { font: 500 .7rem/1 var(--mono); padding: .2em .45em; border-radius: 4px; border: 1px solid var(--line); background: var(--panel); }
@media (max-width: 1100px) { .page { grid-template-columns: minmax(0, 1fr); } .toc { display: none; } }
@media (max-width: 760px) { .shell { grid-template-columns: 1fr; } .side { position: static; height: auto; border-right: 0; border-bottom: 1px solid var(--line); } .page { padding: 1.4rem 1.2rem 4rem; } }