:root {
  --bg: #faf9f5; --bg2: #f0eee6; --bg3: #e8e6dc; --fg: #141413; --fg2: #5e5d59; --fg3: #87867f;
  --line: #dedcd1; --accent: #141413; --code-bg: #f3f1ea; --warn-bg: #f8ece0; --warn-line: #c9663f;
  --tip-bg: #f0eee6; --radius: 8px; --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Roboto, sans-serif;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Songti SC", "Noto Serif CJK SC", "Source Han Serif SC", serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #1b1a18; --bg2: #262522; --bg3: #302f2b; --fg: #f2f0e8; --fg2: #b8b6ac; --fg3: #8d8b82;
    --line: #3a3934; --accent: #f2f0e8; --code-bg: #24231f; --warn-bg: #33261c; --warn-line: #de9a76; --tip-bg: #262522;
  }
}
:root[data-theme="dark"] {
  --bg: #1b1a18; --bg2: #262522; --bg3: #302f2b; --fg: #f2f0e8; --fg2: #b8b6ac; --fg3: #8d8b82;
  --line: #3a3934; --accent: #f2f0e8; --code-bg: #24231f; --warn-bg: #33261c; --warn-line: #de9a76; --tip-bg: #262522;
}
* { box-sizing: border-box; }
html { scroll-padding-top: 24px; -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 18px/1.65 var(--serif); }
a { color: var(--accent); text-decoration: underline; text-decoration-color: var(--fg3); text-underline-offset: 3px; }
a:hover { text-decoration-color: currentColor; }
code, pre, kbd { font-family: var(--mono); }


.top { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 16px; max-width: 1440px; margin: 0 auto; padding: 24px 56px; font-family: var(--sans); }
.pills { display: flex; gap: 8px; min-width: 0; }
.pill, .tbtn { all: unset; box-sizing: border-box; cursor: pointer; padding: 5px 14px; border: 1px solid var(--line); border-radius: 999px; font: 14px/1.5 var(--sans); color: var(--fg2); white-space: nowrap; }
.pill:hover, .tbtn:hover { background: var(--bg2); color: var(--fg); }
.pill[aria-current] { background: var(--bg3); color: var(--fg); }
.pill:focus-visible, .tbtn:focus-visible { outline: 2px solid var(--fg); outline-offset: 2px; }
.brand { display: flex; align-items: center; gap: 8px; font: 700 17px/1 var(--sans); color: var(--fg); text-decoration: none; white-space: nowrap; }
.brand svg { width: 22px; height: 22px; }
.tools { display: flex; justify-content: flex-end; gap: 8px; }

.title { max-width: 1100px; margin: 0 auto; padding: 32px 24px 56px; text-align: center; }
h1 { margin: 0; font: 700 clamp(34px, 4.2vw, 54px)/1.12 var(--sans); letter-spacing: -.025em; }

.wrap { display: grid; grid-template-columns: 240px minmax(0, 780px) 240px; grid-template-areas: "toc hero meta" "toc main meta"; justify-content: space-between; column-gap: 40px; max-width: 1440px; margin: 0 auto; padding: 0 56px; }
nav.toc { grid-area: toc; position: sticky; top: 24px; align-self: start; max-height: calc(100vh - 48px); overflow-y: auto; font: 15px/1.4 var(--sans); }
nav.toc a { display: flex; gap: 14px; padding: 13px 0; border-top: 1px solid var(--line); color: var(--fg2); text-decoration: none; }
nav.toc a:hover { color: var(--fg); }
nav.toc a.on { color: var(--fg); font-weight: 600; }
nav.toc .n { flex: none; font: 400 13.5px/1.55 var(--mono); color: var(--fg3); }

.hero { grid-area: hero; margin: 0 0 48px; border-radius: var(--radius); overflow: hidden; }
.hero svg { display: block; width: 100%; height: auto; }

.meta { grid-area: meta; align-self: start; font: 15px/1.45 var(--sans); }
.meta > div { display: grid; grid-template-columns: 76px minmax(0, 1fr); gap: 12px; padding: 13px 0; border-top: 1px solid var(--line); }
.meta dt { color: var(--fg); font-weight: 500; }
.meta dd { margin: 0; color: var(--fg2); overflow-wrap: anywhere; }
.meta dd span.v { display: block; }
.meta dd span.v + span.v { margin-top: 8px; }
.meta a { color: var(--fg2); }
dl.meta { margin: 0; }

main { grid-area: main; min-width: 0; padding: 0 0 96px; }
.lead { margin: 0 0 28px; font-size: 21px; line-height: 1.55; }
h2 { margin: 56px 0 16px; padding-top: 32px; border-top: 1px solid var(--line); font: 700 28px/1.25 var(--sans); letter-spacing: -.015em; }
h3 { margin: 32px 0 8px; font: 600 19px/1.35 var(--sans); }
p, ul, ol { margin: 0 0 16px; }
p, li { overflow-wrap: anywhere; }
li { margin: 6px 0; }
:not(pre) > code { padding: 1px 6px; border-radius: 5px; background: var(--bg3); font-size: .78em; }

.code { position: relative; margin: 12px 0 22px; }
pre { margin: 0; padding: 16px 18px; border-radius: var(--radius); background: var(--code-bg); border: 1px solid var(--line); overflow-x: auto; font-size: 13.5px; line-height: 1.65; }
pre .c { color: var(--fg3); }
.copy { all: unset; position: absolute; top: 8px; right: 8px; cursor: pointer; padding: 3px 10px; border: 1px solid var(--line); border-radius: 999px; font: 12px/1.5 var(--sans); color: var(--fg2); background: var(--bg); opacity: 0; transition: opacity .12s; }
.code:hover .copy, .copy:focus-visible { opacity: 1; }
@media (hover: none) { .copy { opacity: 1; } }

.cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin: 24px 0 8px; }
.card { padding: 18px; border: 1px solid var(--line); border-radius: var(--radius); font-family: var(--sans); }
.card b { display: block; margin-bottom: 6px; font-size: 15px; font-weight: 600; }
.card span { display: block; color: var(--fg2); font-size: 14px; line-height: 1.5; }
.step { display: inline-flex; align-items: center; justify-content: center; width: 22px; height: 22px; margin-right: 6px; border-radius: 50%; background: var(--fg); color: var(--bg); font: 600 12px/1 var(--sans); }

.note { margin: 18px 0 22px; padding: 14px 18px; border-radius: var(--radius); background: var(--tip-bg); border-left: 3px solid var(--fg3); font-size: 16.5px; }
.note.warn { background: var(--warn-bg); border-left-color: var(--warn-line); }
.note p:last-child, .note ul:last-child { margin-bottom: 0; }

table { width: 100%; border-collapse: collapse; margin: 12px 0 22px; font: 14.5px/1.5 var(--sans); }
th, td { text-align: left; vertical-align: top; padding: 11px 12px 11px 0; border-bottom: 1px solid var(--line); }
th { font-weight: 600; color: var(--fg); border-bottom-color: var(--fg3); }
td code { white-space: nowrap; }
.tablewrap { overflow-x: auto; }

.chat { display: flex; flex-direction: column; gap: 8px; margin: 14px 0 22px; font-family: var(--sans); font-size: 15px; line-height: 1.5; }
.say { align-self: flex-end; max-width: 85%; padding: 9px 14px; border-radius: 14px 14px 4px 14px; background: var(--fg); color: var(--bg); }
.do { align-self: flex-start; max-width: 92%; padding: 9px 14px; border-radius: 14px 14px 14px 4px; background: var(--bg2); font-size: 13px; }
.do code { background: none; padding: 0; }
.say, .do { overflow-wrap: anywhere; }

footer { margin-top: 72px; padding-top: 20px; border-top: 1px solid var(--line); color: var(--fg3); font: 13px/1.6 var(--sans); }
footer a { color: var(--fg2); }


/* blog additions */
.tbtn { text-decoration: none; }
.pill { text-decoration: none; }
.sub { margin: 16px 0 0; color: var(--fg2); font-size: 21px; line-height: 1.5; }
.home { max-width: 1328px; margin: 0 auto; padding: 0 56px 96px; }
.sec { margin: 0 0 16px; padding-top: 13px; border-top: 1px solid var(--line); font: 15px/1.4 var(--sans); color: var(--fg2); }
.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 44px 32px; }
.item { display: block; color: inherit; text-decoration: none; }
.thumb { border-radius: var(--radius); overflow: hidden; transition: opacity .15s; }
.thumb svg { display: block; width: 100%; height: auto; }
.item:hover .thumb { opacity: .88; }
.item:hover h2 { text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
.item:focus-visible { outline: 2px solid var(--fg); outline-offset: 4px; border-radius: var(--radius); }
.item h2 { margin: 16px 0 6px; padding: 0; border: 0; font: 700 19px/1.32 var(--sans); letter-spacing: -.01em; }
.item p { margin: 0; color: var(--fg2); font: 14px/1.5 var(--sans); }
.katex { font-size: 1.04em; }
.katex-display { margin: 18px 0 22px; overflow-x: auto; overflow-y: hidden; padding: 2px 0; }
.title .katex { font-size: .92em; }
h2 .katex, h3 .katex { font-size: .96em; }
td code, th code { white-space: nowrap; }
td, th { overflow-wrap: normal; }
.tablewrap { margin: 12px 0 22px; }
.tablewrap table { margin: 0; }
blockquote { margin: 16px 0 20px; padding: 2px 0 2px 18px; border-left: 3px solid var(--line); color: var(--fg2); }
.note-t { margin: 0 0 8px; font: 600 15.5px/1.4 var(--sans); }
.note p, .note li { font-size: inherit; }
.note > :last-child { margin-bottom: 0; }
.note.danger { background: var(--warn-bg); border-left-color: #c9402a; }
.note.warning { background: var(--warn-bg); border-left-color: var(--warn-line); }
details.note > summary { cursor: pointer; list-style-position: inside; }
details.note > summary .note-t { display: inline; margin: 0; }
details.note[open] > summary { margin-bottom: 8px; }
.diagram { margin: 18px 0 24px; padding: 18px; border-radius: var(--radius); background: #f7f5ee; border: 1px solid var(--line); overflow-x: auto; }
.diagram svg { display: block; margin: 0 auto; max-width: 100%; height: auto; }
main ol, main ul { padding-left: 1.4em; }
footer { margin-top: 72px; }

@media (max-width: 1240px) {
  .top { grid-template-columns: auto minmax(0, 1fr) auto; padding: 20px 32px; }
  .wrap { grid-template-columns: 220px minmax(0, 1fr); grid-template-areas: "toc hero" "toc meta" "toc main"; padding: 0 32px; }
  .hero { margin-bottom: 24px; }
  .meta { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 24px; margin-bottom: 40px; }
  .home { padding: 0 32px 72px; }
  .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .top .pills { order: 3; grid-column: 1 / -1; }
}
@media (max-width: 860px) {
  body { font-size: 17px; }
  .top { padding: 16px; }
  .title { padding: 20px 16px 32px; }
  .wrap { grid-template-columns: minmax(0, 1fr); grid-template-areas: "hero" "meta" "main"; padding: 0 16px; }
  nav.toc { display: none; }
  .meta { grid-template-columns: minmax(0, 1fr); }
  .cards { grid-template-columns: minmax(0, 1fr); }
  .lead { font-size: 19px; }
  h2 { font-size: 24px; }
  .home { padding: 0 16px 56px; }
  .grid { grid-template-columns: minmax(0, 1fr); }
  .sub { font-size: 18px; }
  .diagram { padding: 10px; }
  .tools .tbtn { padding: 5px 11px; }
}