/* PIT buyer documentation. Self-contained: no build step. Fonts load from Google Fonts when
   online and fall back to system fonts offline. Colours mirror web/src/styles/tokens.css. */
:root {
  color-scheme: dark;
  --font-display: "Big Shoulders Display", "Arial Narrow", sans-serif;
  --font-ui: "Geist", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "Geist Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --bg: #060708;
  --s1: #0e1013;
  --s2: #13161a;
  --s3: #1a1e23;
  --line: rgba(255, 255, 255, 0.07);
  --line-2: rgba(255, 255, 255, 0.12);
  --tx: #eef0f2;
  --tx-2: #a4abb5;
  --tx-3: #6b737e;
  --volt: #d7ff32;
  --volt-ink: #0b0d02;
  --volt-soft: rgba(215, 255, 50, 0.08);
  --volt-line: rgba(215, 255, 50, 0.3);
  --up: #1fcb84;
  --down: #f23f5d;
  --down-soft: rgba(242, 63, 93, 0.1);
  --warn: #f5a524;
  --warn-soft: rgba(245, 165, 36, 0.1);
  --r: 12px;
  --side: 272px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 24px; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--tx);
  font: 16px/1.65 var(--font-ui);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--volt); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
code, kbd, pre, .mono { font-family: var(--font-mono); font-size: 0.88em; }
code { background: var(--s2); border: 1px solid var(--line); padding: 1px 6px; border-radius: 6px; overflow-wrap: anywhere; }
pre {
  background: var(--s1); border: 1px solid var(--line-2); border-radius: var(--r);
  padding: 14px 16px; overflow-x: auto; line-height: 1.55; font-size: 13.5px;
}
pre code { background: none; border: 0; padding: 0; font-size: inherit; overflow-wrap: normal; }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 12px; top: 12px; z-index: 99; background: var(--volt); color: var(--volt-ink); padding: 8px 12px; border-radius: 8px; }

/* top bar (mobile) */
.topbar {
  display: none; position: sticky; top: 0; z-index: 20; height: 56px; align-items: center; gap: 12px;
  padding: 0 16px; background: rgba(6, 7, 8, 0.92); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line);
}
.menu-btn {
  font: 600 14px var(--font-ui); color: var(--tx); background: var(--s2); border: 1px solid var(--line-2);
  border-radius: 8px; padding: 6px 12px; cursor: pointer;
}

/* sidebar */
.side {
  position: fixed; inset: 0 auto 0 0; width: var(--side); overflow-y: auto; padding: 22px 16px 40px;
  background: #0a0b0d; border-right: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--tx); margin: 0 8px 4px; }
.logo {
  width: 30px; height: 30px; border-radius: 8px; background: var(--volt); color: var(--volt-ink);
  display: grid; place-items: center; font: 900 18px var(--font-display);
}
.brand b { font: 800 24px/1 var(--font-display); letter-spacing: 0.02em; }
.ver { margin: 0 8px 18px; color: var(--tx-3); font: 12px var(--font-mono); }
.home { display: block; margin: 0 8px 16px; font-size: 13px; color: var(--tx-2); text-decoration: none; }
.home:hover { color: var(--tx); }
.home-top { margin-left: auto; font-size: 13px; color: var(--tx-2); text-decoration: none; }
.side nav ol { list-style: none; margin: 0; padding: 0; counter-reset: s; }
.side nav li a {
  display: block; padding: 6px 10px; border-radius: 8px; color: var(--tx-2); text-decoration: none; font-size: 14px;
  border-left: 2px solid transparent;
}
.side nav li a::before { counter-increment: s; content: counter(s, decimal-leading-zero); font: 11px var(--font-mono); color: var(--tx-3); margin-right: 10px; }
.side nav li a:hover { background: var(--s2); color: var(--tx); }
.side nav li a.on { background: var(--volt-soft); color: var(--tx); border-left-color: var(--volt); }

/* main */
main { margin-left: var(--side); padding: 40px clamp(20px, 4vw, 64px) 80px; max-width: calc(var(--side) + 980px); }
.hero { border-bottom: 1px solid var(--line); padding-bottom: 28px; margin-bottom: 8px; }
.eyebrow { font: 600 12px var(--font-mono); letter-spacing: 0.14em; text-transform: uppercase; color: var(--tx-3); }
h1 { font: 800 clamp(44px, 7vw, 76px)/0.95 var(--font-display); text-transform: uppercase; margin: 12px 0 14px; letter-spacing: 0.005em; }
h1 em { font-style: normal; color: var(--volt); }
.lede { font-size: 18px; color: var(--tx-2); max-width: 70ch; margin: 0; }
section { padding-top: 36px; border-bottom: 1px solid var(--line); padding-bottom: 20px; }
h2 { font: 800 34px/1.05 var(--font-display); text-transform: uppercase; margin: 0 0 14px; letter-spacing: 0.01em; }
h2 .n { color: var(--volt); font: 600 14px var(--font-mono); vertical-align: middle; margin-right: 10px; }
h3 { font: 600 18px/1.3 var(--font-ui); margin: 28px 0 8px; }
h4 { font: 600 15px var(--font-ui); margin: 20px 0 6px; color: var(--tx); }
p, li { color: #d3d7dc; }
ul, ol { padding-left: 22px; }
li { margin: 4px 0; }
strong { color: var(--tx); }

/* callouts */
.note { border: 1px solid var(--line-2); background: var(--s1); border-radius: var(--r); padding: 12px 16px; margin: 16px 0; }
.note > :first-child { margin-top: 0; }
.note > :last-child { margin-bottom: 0; }
.note.warn { border-color: rgba(245, 165, 36, 0.35); background: var(--warn-soft); }
.note.danger { border-color: rgba(242, 63, 93, 0.4); background: var(--down-soft); }
.note.volt { border-color: var(--volt-line); background: var(--volt-soft); }
.note .t { display: block; font: 600 12px var(--font-mono); letter-spacing: 0.12em; text-transform: uppercase; margin-bottom: 4px; }
.note.warn .t { color: var(--warn); }
.note.danger .t { color: var(--down); }
.note.volt .t { color: var(--volt); }

/* tables */
.tbl { overflow-x: auto; border: 1px solid var(--line-2); border-radius: var(--r); margin: 14px 0; }
table { border-collapse: collapse; width: 100%; font-size: 14px; }
th, td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font: 600 11px var(--font-mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--tx-3); background: var(--s1); white-space: nowrap; }
tr:last-child td { border-bottom: 0; }
td code { white-space: nowrap; }
td.wrap code { white-space: normal; }
.y { color: var(--down); font-weight: 600; }

/* steps */
.steps { counter-reset: st; list-style: none; padding: 0; }
.steps > li { position: relative; padding: 2px 0 10px 44px; }
.steps > li::before {
  counter-increment: st; content: counter(st); position: absolute; left: 0; top: 2px; width: 28px; height: 28px;
  border-radius: 50%; background: var(--s3); border: 1px solid var(--volt-line); color: var(--volt);
  display: grid; place-items: center; font: 600 13px var(--font-mono);
}

/* figures */
figure { margin: 18px 0; }
figure img { width: 100%; height: auto; display: block; border-radius: var(--r); border: 1px solid var(--line-2); }
figcaption { color: var(--tx-3); font-size: 13px; margin-top: 6px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.grid2 figure { margin: 0; }

.faq dt { font-weight: 600; color: var(--tx); margin-top: 18px; }
.faq dd { margin: 4px 0 0; color: #d3d7dc; }
.kv { display: grid; grid-template-columns: max-content 1fr; gap: 4px 16px; }
.pill { display: inline-block; font: 600 11px var(--font-mono); padding: 1px 8px; border-radius: 99px; border: 1px solid var(--line-2); color: var(--tx-2); }
.pill.ok { border-color: rgba(31, 203, 132, 0.4); color: var(--up); }
.pill.bad { border-color: rgba(242, 63, 93, 0.4); color: var(--down); }
footer.doc-foot { color: var(--tx-3); font-size: 13px; padding-top: 28px; }

@media (max-width: 960px) {
  .topbar { display: flex; }
  .side { transform: translateX(-100%); transition: transform 0.2s; z-index: 30; top: 56px; width: min(86vw, 320px); }
  body.nav-open .side { transform: none; box-shadow: 0 0 0 100vmax rgba(0, 0, 0, 0.55); }
  main { margin-left: 0; padding-top: 24px; }
  .grid2 { grid-template-columns: 1fr; }
  .kv { grid-template-columns: 1fr; }
  html { scroll-padding-top: 68px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .side { transition: none; } }
@media print { .side, .topbar { display: none; } main { margin: 0; } }