/* The static SEO pages (tools/seo/: course, commands, interview, glossary, blog). No scripts.
   Palettes = the app's OnCallReady Light / OnCallReady Aubergine (src/ui/themes.ts); every text pair
   checked for WCAG AA (4.5:1). Code blocks keep the terminal's aubergine in both modes. */
:root {
  color-scheme: light dark;
  --bg: #fcfafb; --card: #ffffff; --well: #f4eef1; --line: #e6dce2; --line2: #d6c7cf;
  --fg: #2a1824; --strong: #1a0c15; --dim: #6f5b68;
  --accent: #b2410f; --mark: #e95420; --fill: #c4410f; --on-fill: #ffffff; --link: #8a2b6e;
  --ic-bg: #f4eaf0; --ic-fg: #7a1f5c; --chip-bg: #f4eef1; --chip-fg: #8a2b6e;
  --shadow: 0 1px 2px rgba(60, 20, 45, .06), 0 8px 24px rgba(60, 20, 45, .07);
  --t-bg: #300a24; --t-bar: #24071b; --t-fg: #ffffff; --t-out: #d3d7cf; --t-ps: #8ae234; --t-cm: #a9959f; --t-edge: transparent;
  --mono: "SF Mono", Menlo, "Ubuntu Mono", Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1b0616; --card: #230a1c; --well: #2a0d22; --line: #3a1730; --line2: #4a2040;
    --fg: #ede3e7; --strong: #ffffff; --dim: #a9959f;
    --accent: #f08a5d; --mark: #e95420; --fill: #e95420; --on-fill: #1b0616; --link: #d0a3c4;
    --ic-bg: #351430; --ic-fg: #fce94f; --chip-bg: #2a0d22; --chip-fg: #d0a3c4;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 10px 28px rgba(0, 0, 0, .35);
    --t-edge: #4a2040;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Ubuntu, Roboto, sans-serif; overflow-wrap: break-word; }
a { color: var(--link); text-underline-offset: .18em; text-decoration-thickness: 1px; }
a:hover { color: var(--accent); }
a:focus-visible, summary:focus-visible { outline: 2px solid var(--mark); outline-offset: 2px; border-radius: 3px; }
h1, h2, h3 { color: var(--strong); letter-spacing: -.01em; }
code, pre { font-family: var(--mono); }
code { background: var(--ic-bg); color: var(--ic-fg); padding: .05em .35em; border-radius: 4px; font-size: .88em; overflow-wrap: anywhere; }
pre { background: var(--t-bg); color: var(--t-out); padding: 14px 16px; border-radius: 10px; overflow-x: auto; font-size: 14px; line-height: 1.55; tab-size: 8; }
pre code { background: none; padding: 0; color: inherit; font-size: inherit; overflow-wrap: normal; }
pre .ps { color: var(--t-ps); font-weight: 700; }
pre .cmd { color: var(--t-fg); }
pre .cm { color: var(--t-cm); }

/* ---- header, footer, shared bits */
.top { display: flex; flex-wrap: wrap; gap: 8px 18px; align-items: center; justify-content: space-between; padding: 12px 16px; border-bottom: 1px solid var(--line); }
.top .brand { font-weight: 700; color: var(--strong); text-decoration: none; font-size: 18px; }
.top .brand::before { content: ""; display: inline-block; width: .55em; height: .55em; margin-right: .45em; border-radius: 2px; background: var(--mark); vertical-align: .08em; }
.top nav { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 14px; font-size: 15px; }
.top nav a { text-decoration: none; }
.top .go, .btn { display: inline-block; background: var(--fill); color: var(--on-fill); padding: 7px 14px; border-radius: 8px; text-decoration: none; font-weight: 600; line-height: 1.4; }
.top .go:hover, .btn:hover { color: var(--on-fill); filter: brightness(1.08); }
main { max-width: 780px; margin: 0 auto; padding: 16px 16px 48px; }
main.wide-index { max-width: 1120px; }
main.wide-post { max-width: 1040px; }
h1 { font-size: 1.9em; line-height: 1.2; margin: .4em 0 .5em; }
h2 { font-size: 1.35em; line-height: 1.3; margin: 1.6em 0 .5em; }
h3 { font-size: 1.12em; line-height: 1.35; margin: 1.3em 0 .4em; }
.lead { font-size: 1.1em; color: var(--dim); }
.kicker, .crumbs { color: var(--dim); font-size: .9em; margin: 0; }
.crumbs a { color: var(--dim); }
.n { color: var(--accent); font-weight: 700; margin-right: .3em; }
.chs, .ls, .cmds { padding-left: 0; list-style: none; }
.chs li, .cmds li { padding: 8px 0; border-bottom: 1px solid var(--line); display: flex; flex-wrap: wrap; gap: 4px 12px; justify-content: space-between; }
.ls li { padding: 4px 0; }
.meta, .cmds span { color: var(--dim); font-size: .9em; }
.eli5 { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 4px 16px; }
.eli5 h2 { font-size: 1.1em; margin-top: .8em; }
blockquote { margin: 1.4em 0; padding: 12px 16px; border-left: 4px solid var(--mark); background: var(--well); border-radius: 0 10px 10px 0; }
blockquote > :first-child { margin-top: 0; }
blockquote > :last-child { margin-bottom: 0; }
.tbl { overflow-x: auto; margin: 1em 0; }
table { border-collapse: collapse; width: 100%; font-size: .93em; }
th, td { border: 1px solid var(--line); padding: 6px 8px; text-align: left; vertical-align: top; }
th { background: var(--well); color: var(--strong); }
details { border: 1px solid var(--line); border-radius: 8px; padding: 8px 12px; margin: 8px 0; background: var(--card); }
summary { cursor: pointer; font-weight: 600; }
.check { border: 1px dashed var(--mark); border-radius: 10px; padding: 4px 14px; margin: 1em 0; }
.check-h { font-weight: 700; color: var(--accent); margin-bottom: 0; }
.iv { border-top: 1px solid var(--line); }
.iv .q { font-weight: 600; font-size: 1.05em; }
.lvl { font-size: .6em; vertical-align: middle; border: 1px solid var(--line2); border-radius: 99px; padding: 1px 8px; color: var(--dim); font-weight: 500; }
.also, .src, .exd { color: var(--dim); font-size: .92em; }
.note { font-size: .9em; color: var(--dim); border-left: 3px solid var(--line2); padding-left: 10px; }
.cta { margin: 2em 0; display: flex; flex-wrap: wrap; gap: 8px 14px; align-items: center; }
.cta span { color: var(--dim); font-size: .92em; }
.pn { display: flex; justify-content: space-between; gap: 16px; margin-top: 2em; padding-top: 1em; border-top: 1px solid var(--line); font-size: .95em; }
.opts dt { margin-top: .7em; } .opts dd { margin-left: 1em; }
.gl dt { margin-top: 1em; font-weight: 700; } .gl dd { margin-left: 0; } .gl .al { font-weight: 400; color: var(--dim); }
.tags a { text-decoration: none; margin-right: 6px; }
footer { border-top: 1px solid var(--line); padding: 16px; color: var(--dim); font-size: .92em; max-width: 1120px; margin: 0 auto; }
footer a { color: var(--dim); }

/* ---- the blog: chips, topics, cards */
.chips { display: inline-flex; flex-wrap: wrap; gap: 6px; }
.chip { display: inline-block; font-size: 13px; line-height: 1.5; font-weight: 600; padding: 2px 10px; border-radius: 99px; background: var(--chip-bg); color: var(--chip-fg); border: 1px solid var(--line); text-decoration: none; white-space: nowrap; }
.chip:hover { border-color: var(--mark); color: var(--chip-fg); }
.chip.on { background: var(--fill); border-color: var(--fill); color: var(--on-fill); }
.hero { padding: 28px 0 8px; max-width: 760px; }
.hero h1 { font-size: clamp(2rem, 1.2rem + 3vw, 3rem); line-height: 1.1; margin: .15em 0 .35em; letter-spacing: -.02em; }
.hero .lead { font-size: 1.15em; max-width: 60ch; margin: 0 0 .9em; }
.hero-k { margin: 0; font-size: 13px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--accent); }
.hero-k a { color: inherit; text-decoration: none; }
.hero-links { display: flex; flex-wrap: wrap; gap: 6px 16px; align-items: center; margin: 0; color: var(--dim); font-size: .92em; }
.rss { font-weight: 600; text-decoration: none; }
.rss::before { content: ""; display: inline-block; width: .7em; height: .7em; margin-right: .4em; border-radius: 2px; background: var(--mark); vertical-align: .02em; }
.topics { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin: 22px 0 26px; padding: 14px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.topics-h { font-size: 13px; font-weight: 700; color: var(--dim); margin-right: 4px; }
.sec-h { font-size: 1.1em; text-transform: uppercase; letter-spacing: .08em; color: var(--dim); margin: 2.2em 0 .9em; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); gap: 18px; }
.card { position: relative; display: flex; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 18px 20px; box-shadow: var(--shadow); transition: border-color .15s, transform .15s; }
.card:hover { border-color: var(--line2); transform: translateY(-2px); }
.card:focus-within { border-color: var(--mark); }
.card-text { display: flex; flex-direction: column; gap: 8px; min-width: 0; flex: 1; }
.card .chips { position: relative; z-index: 1; }
.card-t { font-size: 1.12em; line-height: 1.3; margin: 0; }
.card-t a { color: var(--strong); text-decoration: none; }
.card-t a::after { content: ""; position: absolute; inset: 0; border-radius: 14px; }
.card-t a:hover { color: var(--strong); text-decoration: underline; }
.card-t a:focus-visible { outline: none; }
.card-d { margin: 0; color: var(--dim); font-size: .95em; line-height: 1.55; }
.card .meta { margin: auto 0 0; font-size: .85em; }
.featured .card { padding: 26px; gap: 28px; }
.card.big .card-t { font-size: clamp(1.4rem, 1rem + 1.5vw, 1.9rem); line-height: 1.2; }
.card.big .card-d { font-size: 1.05em; }
.card-art { min-width: 0; flex: 1; align-self: center; }
.card-art .term { margin: 0; }
.card-art pre { font-size: 12.5px; }

/* ---- the blog: terminal code blocks */
.term { margin: 1.4em 0; border-radius: 10px; overflow: hidden; background: var(--t-bg); border: 1px solid var(--t-edge); box-shadow: var(--shadow); }
.term-bar { display: flex; align-items: center; gap: 12px; padding: 7px 12px; background: var(--t-bar); }
.dots { display: inline-flex; gap: 6px; }
.dots i { width: 10px; height: 10px; border-radius: 50%; background: #5c3350; }
.dots i:first-child { background: #e95420; }
.term-t { font: 12px/1.4 var(--mono); color: var(--t-cm); }
.term pre { margin: 0; border-radius: 0; background: none; }

/* ---- the blog: a post */
.post-wrap { display: grid; grid-template-columns: minmax(0, 1fr); }
.post-head { padding-top: 18px; }
.post-k { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; }
.post-head h1 { font-size: clamp(1.9rem, 1.3rem + 2.2vw, 2.6rem); line-height: 1.15; margin: .45em 0 .4em; letter-spacing: -.02em; }
.post-head .lead { font-size: 1.2em; line-height: 1.55; margin: 0 0 1.2em; }
.toc { border: 1px solid var(--line); background: var(--card); border-radius: 12px; padding: 12px 18px; margin: 0 0 1.4em; font-size: .93em; }
.toc-h { margin: 0 0 6px; font-size: 12px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--dim); }
.toc ol { margin: 0; padding-left: 1.3em; }
.toc li { margin: 3px 0; }
.toc li::marker { color: var(--dim); }
.toc a { color: var(--fg); text-decoration: none; }
.toc a:hover { color: var(--accent); text-decoration: underline; }
.post { font-size: 1.04em; line-height: 1.72; }
.post > p, .post > ul, .post > ol { max-width: 68ch; }
.post h2 { font-size: 1.45em; margin: 1.9em 0 .55em; scroll-margin-top: 16px; }
.post h3 { scroll-margin-top: 16px; }
.post li { margin: .3em 0; }
.post strong { color: var(--strong); }
.lab { margin: 2.6em 0 1.6em; padding: 22px 24px; border-radius: 14px; background: var(--well); border: 1px solid var(--line2); border-top: 4px solid var(--mark); }
.lab h2 { margin: .15em 0 .4em; font-size: 1.4em; }
.lab p { margin: .5em 0; }
.lab-k { margin: 0; font-size: 12px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--accent); }
.lab-sub { font-weight: 600; color: var(--strong); margin-top: 1em; }
.lab-ls { list-style: none; padding: 0; margin: 0 0 .6em; }
.lab-ls li { border-top: 1px solid var(--line2); }
.lab-ls li:last-child { border-bottom: 1px solid var(--line2); }
.lab-ls a { display: block; padding: 8px 0; text-decoration: none; color: var(--fg); }
.lab-ls a:hover { color: var(--accent); }
.lab-go { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 16px; margin-top: 1.1em; }
.lab-go span { color: var(--dim); font-size: .92em; }
.share { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin: 1.6em 0; font-size: .9em; }
.share span { color: var(--dim); font-weight: 600; margin-right: 4px; }
.share a { padding: 4px 12px; border: 1px solid var(--line2); border-radius: 99px; text-decoration: none; color: var(--fg); }
.share a:hover { border-color: var(--mark); color: var(--accent); }
.related h2 { font-size: 1.2em; }
.related .grid { grid-template-columns: repeat(auto-fill, minmax(min(100%, 220px), 1fr)); gap: 14px; }
.related .card { padding: 16px; }
.related .card-t { font-size: 1em; }
.related .card-d { display: none; }
.post-pn { gap: 12px; }
.post-pn a { display: flex; flex-direction: column; max-width: 48%; text-decoration: none; color: var(--fg); line-height: 1.35; }
.post-pn a:last-child { text-align: right; margin-left: auto; }
.post-pn small { color: var(--dim); font-size: .82em; margin-bottom: 3px; }
.post-pn a:hover { color: var(--accent); }
.free { color: var(--dim); font-size: .9em; text-align: center; margin: 2.4em 0 0; }

@media (min-width: 820px) {
  .featured .card { padding: 30px 32px; }
  .card.big .card-art { display: block; }
  .card.big { align-items: center; }
}
@media (max-width: 819px) {
  .card.big { flex-direction: column; }
}
@media (min-width: 1080px) {
  .post-wrap { grid-template-columns: minmax(0, 1fr) 230px; column-gap: 56px; grid-template-areas: "head ." "body toc" "foot ."; }
  .post-head { grid-area: head; }
  .post { grid-area: body; }
  .toc { grid-area: toc; position: sticky; top: 20px; align-self: start; margin: 4px 0 0; border: 0; border-left: 2px solid var(--line); border-radius: 0; background: none; padding: 2px 0 2px 16px; }
  .toc ol { list-style: none; padding: 0; }
  .toc a { color: var(--dim); }
  .post-foot { grid-area: foot; min-width: 0; }
}
@media (max-width: 600px) {
  body { font-size: 16px; }
  h1 { font-size: 1.55em; }
  pre { font-size: 13px; }
  .post { font-size: 1em; }
  .featured .card, .lab { padding: 18px; }
  .post-pn { flex-direction: column; }
  .post-pn a { max-width: none; }
  .post-pn a:last-child { text-align: left; margin-left: 0; }
}
@media (prefers-reduced-motion: reduce) { .card { transition: none; } .card:hover { transform: none; } }