:root{
  --paper:#f6f4ef; --ink:#14181c; --ink-soft:#5a6470; --rule:#d5d0c6;
  --signal:#b3400d; --signal-dim:#8f330a;
  --deep:#101a22; --deep-soft:#8fa3b0; --deep-rule:#2a3a46;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:var(--sans);font-size:1.12rem;line-height:1.68;
  -webkit-font-smoothing:antialiased;
}
.wrap{max-width:36rem;margin:0 auto;padding:0 1.3rem}
section{padding:3rem 0;position:relative}
@media(min-width:900px){section{padding:4rem 0}}

/* marginal paragraph number, like the manual */
.pn{
  font-family:var(--mono);font-size:.72rem;color:var(--ink-soft);
  letter-spacing:.04em;display:block;margin:0 0 .55rem;
}
@media(min-width:1080px){
  .pn{position:absolute;left:calc(50% - 18rem - 5.2rem);top:.55rem;width:4.4rem;text-align:right;margin:0}
  section{padding-left:0}
}

h1{
  font-weight:700;line-height:1.08;letter-spacing:-.018em;
  font-size:clamp(2rem,5.6vw,3.05rem);margin:0 0 1.1rem;
}
h2{
  font-weight:700;line-height:1.18;letter-spacing:-.015em;
  font-size:clamp(1.4rem,3.4vw,1.95rem);margin:0 0 1.1rem;
}
h3{font-weight:700;font-size:1.06rem;margin:2rem 0 .5rem;letter-spacing:-.005em}
p{margin:0 0 1.1rem}
.sub{font-size:clamp(1.08rem,2.4vw,1.28rem);line-height:1.45;margin:0 0 1.5rem}
.lede{font-size:1.02rem;color:var(--ink-soft);margin:0 0 1.6rem}
strong{font-weight:700}
a{color:var(--signal-dim)}

.rule{border:0;border-top:1px solid var(--rule);margin:0}
.band{background:var(--deep);color:var(--paper)}
.band h2{color:#fff}
.band p{color:#e2e8ec}
.band .pn{color:var(--deep-soft)}
.band strong{color:#fff}
.band a{color:#e8a184}

/* CTA */
.cta{
  display:inline-block;background:var(--signal);color:#fff;
  font-family:var(--mono);font-size:.94rem;letter-spacing:.02em;
  text-decoration:none;padding:.8rem 1.35rem;border-radius:3px;border:1px solid var(--signal);
  transition:background 120ms ease;
}
.cta:hover,.cta:focus{background:var(--signal-dim)}
.cta.ghost{background:transparent;color:var(--signal-dim);border:1px solid var(--rule)}
.cta.ghost:hover,.cta.ghost:focus{border-color:var(--signal);background:rgba(179,64,13,.06)}
.band .cta.ghost{color:#e8a184;border-color:var(--deep-rule)}
a:focus-visible,.cta:focus-visible{outline:2px solid var(--signal);outline-offset:3px}
.ctas{display:flex;flex-wrap:wrap;gap:.7rem;margin:1.7rem 0 .4rem}

/* tables */
table{width:100%;border-collapse:collapse;margin:1.6rem 0;font-size:.95rem}
th,td{text-align:left;padding:.5rem .55rem;border-bottom:1px solid var(--rule);vertical-align:top}
th{font-family:var(--mono);font-size:.76rem;text-transform:uppercase;letter-spacing:.06em;color:var(--ink-soft);font-weight:400}
td.num,th.num{text-align:right;font-family:var(--mono);font-variant-numeric:tabular-nums}
td.mono,.collide td{font-family:var(--mono);font-size:.86rem;line-height:1.5}
.collide td:first-child{color:var(--signal);white-space:nowrap}
.caption{font-size:.86rem;color:var(--ink-soft);line-height:1.5;margin:-.7rem 0 1.6rem}

/* figures */
.card-spec{
  border:1px solid var(--rule);border-left:3px solid var(--signal);
  border-radius:3px;padding:1.1rem 1.2rem;margin:1.7rem 0;background:#fffdf9;
}
.card-spec .q{font-weight:700;margin:0 0 .8rem}
.card-spec p{margin:0 0 .8rem}
.card-spec .cite{font-family:var(--mono);font-size:.8rem;color:var(--ink-soft);margin:0}
.drill{
  border-left:2px solid var(--rule);padding:.2rem 0 .2rem 1.1rem;margin:1.7rem 0;
}
.drill p{margin:0 0 .9rem}
.drill .t{font-family:var(--mono);font-size:.82rem;color:var(--signal);letter-spacing:.04em}
.band .drill{border-left-color:var(--deep-rule)}
pre{
  font-family:var(--mono);font-size:.82rem;line-height:1.7;overflow-x:auto;
  background:#efece4;border:1px solid var(--rule);border-radius:3px;padding:.85rem 1rem;margin:1.4rem 0;
}
blockquote{margin:1.6rem 0;padding:.1rem 0 .1rem 1.1rem;border-left:2px solid var(--signal);font-size:1.06rem}
blockquote p{margin:0}

ul{margin:0 0 1.2rem;padding-left:1.15rem}
li{margin:0 0 .45rem}
.tiers{margin:1.6rem 0}
.tier{border-top:1px solid var(--rule);padding:1.1rem 0}
.tier .name{font-family:var(--mono);font-size:.88rem;color:var(--signal);letter-spacing:.03em;margin:0 0 .35rem}
.tier p{margin:0}
.faq h3{margin:1.9rem 0 .45rem}
.faq p{margin:0 0 .9rem}

.notice{
  background:#efece4;border:1px solid var(--rule);border-left:3px solid var(--signal);
  border-radius:3px;padding:.85rem 1.05rem;font-size:.9rem;line-height:1.6;
  color:var(--ink-soft);margin:0 0 2.2rem;
}
.notice a{color:var(--signal-dim)}
footer{border-top:1px solid var(--rule);padding:2.2rem 0 3.2rem;color:var(--ink-soft);font-size:.88rem}
footer p{margin:0 0 .7rem}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto}}
@media(max-width:29rem){
  .collide,.collide thead,.collide tbody,.collide tr,.collide td,.collide th{display:block}
  .collide thead{display:none}
  .collide tr{border-bottom:1px solid var(--rule);padding:.5rem 0}
  .collide td{border:0;padding:.15rem 0}
  .collide td:first-child{font-weight:700}
  .collide td:nth-child(2)::before{content:"Table 8-2: ";color:var(--ink-soft)}
  .collide td:nth-child(3)::before{content:"Table 15-6: ";color:var(--ink-soft)}
}