/* Regular Rate Audit — site-wide styles.
   Design language: editorial-legal. Serif display over quiet paper, deep navy accent,
   computation set in dark "ledger" blocks. No external assets; system stacks only. */
:root {
  --bg: #fbfaf8; --panel: #f3f1ec; --ink: #1d2733; --muted: #5c6673;
  --line: #e2ded5; --accent: #14537d; --accent-strong: #0e3f61; --accent-ink: #ffffff;
  --good: #177a4c; --bad: #b3261e; --bad-bg: #fbeeec;
  --code-bg: #16283a; --code-ink: #d9e6f2;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #131920; --panel: #1b232d; --ink: #e7ebef; --muted: #98a4b0;
    --line: #2d3947; --accent: #6fb1dc; --accent-strong: #8ec4e8; --accent-ink: #0d2233;
    --good: #5bc78e; --bad: #f1948c; --bad-bg: #33201e;
    --code-bg: #0e1822; --code-ink: #cfe0ee;
  }
}
* { box-sizing: border-box; margin: 0; }
html { scroll-behavior: smooth; }
body {
  font: 17px/1.7 var(--sans);
  background: var(--bg); color: var(--ink);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--accent-strong); }
main { max-width: 780px; margin: 0 auto; padding: 2rem 1.25rem 5rem; }

/* Accessibility */
.skip {
  position: absolute; left: -9999px; top: 0; z-index: 10;
  background: var(--accent); color: var(--accent-ink);
  padding: .5rem 1rem; border-radius: 0 0 8px 0; text-decoration: none;
}
.skip:focus { left: 0; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* Header */
header.site {
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel) 55%, var(--bg));
  padding: .9rem 1.25rem;
}
header.site .inner {
  max-width: 780px; margin: 0 auto; display: flex; align-items: center;
  gap: 1.4rem; flex-wrap: wrap;
}
header.site .brand {
  display: inline-flex; align-items: center; gap: .6rem;
  font-family: var(--serif); font-weight: 700; font-size: 1.12rem;
  letter-spacing: .01em; color: var(--ink); text-decoration: none;
}
header.site .brand::before {
  content: "RR";
  display: inline-flex; align-items: center; justify-content: center;
  width: 1.7rem; height: 1.7rem; border-radius: 7px;
  background: var(--accent); color: var(--accent-ink);
  font-family: var(--sans); font-size: .72rem; font-weight: 700; letter-spacing: .05em;
}
header.site nav { display: flex; gap: 1.15rem; font-size: .9rem; margin-left: auto; }
header.site nav a { color: var(--muted); text-decoration: none; padding: .15rem 0; }
header.site nav a:hover { color: var(--accent); }
header.site nav a[aria-current] {
  color: var(--accent); font-weight: 600;
  border-bottom: 2px solid var(--accent);
}

/* Typography */
h1, h2 { font-family: var(--serif); letter-spacing: -.01em; }
h1 { font-size: 2.15rem; line-height: 1.2; margin: 1.4rem 0 .8rem; text-wrap: balance; }
h2 { font-size: 1.45rem; line-height: 1.3; margin: 2.4rem 0 .7rem; }
h3 { font-size: 1.05rem; margin: 1.5rem 0 .45rem; }
p, ul, ol { margin-bottom: 1rem; }
ul, ol { padding-left: 1.4rem; }
li + li { margin-top: .45rem; }
li::marker { color: var(--muted); }
strong { color: color-mix(in srgb, var(--ink) 92%, var(--accent)); }
.lede {
  font-size: 1.16rem; line-height: 1.6; color: var(--muted);
  font-family: var(--serif); margin-bottom: 1.1rem;
}
.byline {
  font-size: .85rem; color: var(--muted); margin-bottom: 1.8rem;
  padding-bottom: 1.1rem; border-bottom: 1px solid var(--line);
}
blockquote {
  border-left: 3px solid var(--accent);
  background: color-mix(in srgb, var(--accent) 6%, var(--bg));
  padding: 1rem 1.2rem; margin: 1.4rem 0; border-radius: 0 10px 10px 0;
}
blockquote p:last-child { margin-bottom: 0; }
hr { border: none; border-top: 1px solid var(--line); margin: 2.2rem 0; }

/* The ledger: worked-math blocks set dark, like terminal output */
pre {
  background: var(--code-bg); color: var(--code-ink);
  border-radius: 10px; padding: 1.05rem 1.2rem;
  overflow-x: auto; font-size: .86rem; line-height: 1.65; margin: 1.1rem 0 1.2rem;
  font-family: var(--mono);
}
code { font-family: var(--mono); font-size: .92em; }
:not(pre) > code {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: 5px; padding: .08em .35em;
}

/* Tables */
.tablewrap { overflow-x: auto; margin-bottom: 1.1rem; }
table { border-collapse: collapse; width: 100%; font-size: .92rem; }
th { font-size: .78rem; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); }
th, td { text-align: left; padding: .55rem .7rem; border-bottom: 1px solid var(--line); vertical-align: top; }

/* Breadcrumb */
nav.breadcrumb { font-size: .8rem; margin: 0 0 1rem; }
nav.breadcrumb ol { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: .35rem; }
nav.breadcrumb li { color: var(--muted); }
nav.breadcrumb li + li::before { content: "›"; margin-right: .35rem; color: var(--line); }
nav.breadcrumb a { color: var(--muted); text-decoration: none; }
nav.breadcrumb a:hover { color: var(--accent); }

/* Cards & callouts */
.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px;
  padding: 1.35rem 1.5rem; margin: 1.5rem 0;
  box-shadow: 0 1px 2px rgba(15, 30, 45, .04);
}
.card h2 { margin-top: 0; font-size: 1.2rem; }
.card h3 { margin-top: 0; }
.grid2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1rem; }
.grid2 .card { margin: 0; }
.note {
  padding: .95rem 1.15rem; border-left: 3px solid var(--accent);
  background: color-mix(in srgb, var(--accent) 6%, var(--bg));
  font-size: .92rem; border-radius: 0 10px 10px 0; margin: 1.2rem 0;
}

/* Buttons */
.btn {
  display: inline-block; background: var(--accent); color: var(--accent-ink);
  padding: .68rem 1.25rem; border-radius: 8px; border: 1px solid transparent;
  text-decoration: none; font-weight: 600; font-size: .95rem; cursor: pointer;
  transition: background .12s ease;
}
.btn:hover { background: var(--accent-strong); color: var(--accent-ink); }
.btn.ghost { background: transparent; color: var(--accent); border-color: color-mix(in srgb, var(--accent) 55%, var(--line)); }
.btn.ghost:hover { background: color-mix(in srgb, var(--accent) 8%, var(--bg)); color: var(--accent-strong); }
.hero-cta { display: flex; gap: .7rem; flex-wrap: wrap; margin: 1.4rem 0 .6rem; }

/* Forms (email capture) */
form.capture { display: flex; gap: .6rem; flex-wrap: wrap; margin-top: .7rem; }
form.capture input[type=email] {
  flex: 1 1 230px; padding: .66rem .85rem; border: 1px solid var(--line);
  border-radius: 8px; background: var(--bg); color: var(--ink); font-size: .95rem;
}
form.capture input[type=email]::placeholder { color: var(--muted); }
.form-msg { display: none; margin-top: .7rem; font-size: .9rem; font-weight: 600; }

/* Calculator */
form.calc {
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px;
  padding: 1.4rem 1.5rem; margin-top: 1.4rem;
  box-shadow: 0 1px 2px rgba(15, 30, 45, .04);
}
form.calc .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 1rem 1.15rem; }
form.calc label { display: block; font-size: .8rem; font-weight: 600; margin-bottom: .3rem; letter-spacing: .01em; }
form.calc label small { display: block; font-weight: 400; color: var(--muted); margin-top: .1rem; }
form.calc input[type=number] {
  width: 100%; padding: .58rem .7rem; font-size: 1.05rem; border: 1px solid var(--line);
  border-radius: 8px; background: var(--bg); color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.toggle { display: flex; align-items: center; gap: .55rem; margin-top: 1.15rem; font-size: .9rem; }
.toggle input { width: 1.15rem; height: 1.15rem; accent-color: var(--accent); }

.results { margin-top: 1.6rem; }
.results .row {
  display: flex; justify-content: space-between; align-items: baseline; gap: 1rem;
  padding: .7rem .2rem; border-bottom: 1px solid var(--line);
}
.results .row .k { color: var(--muted); font-size: .92rem; }
.results .row .v {
  font-variant-numeric: tabular-nums; font-weight: 650; text-align: right; white-space: nowrap;
}
.results .row.hero {
  background: color-mix(in srgb, var(--accent) 7%, var(--bg));
  border-radius: 10px; padding: .8rem .8rem; border-bottom: none; margin: .5rem 0 .15rem;
}
.results .row.hero .k { color: var(--ink); }
.results .row.hero .v { font-size: 1.45rem; color: var(--accent); font-family: var(--serif); }
.results .row.delta {
  background: var(--bad-bg); border-left: 3px solid var(--bad);
  border-radius: 0 10px 10px 0; padding: .7rem .8rem; border-bottom: none; margin-top: .4rem;
}
.results .row.delta .v, .results .row.delta .k { color: var(--bad); font-weight: 700; }
.punch { margin-top: 1.35rem; font-size: .97rem; }

/* Footer */
footer.site {
  border-top: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel) 55%, var(--bg));
  margin-top: 3rem; padding: 1.6rem 1.25rem 2.4rem;
  font-size: .82rem; color: var(--muted);
}
footer.site .inner { max-width: 780px; margin: 0 auto; }
footer.site p { margin-bottom: .35rem; }
footer.site a { color: var(--muted); }
footer.site a:hover { color: var(--accent); }
.fine { font-size: .82rem; color: var(--muted); line-height: 1.65; }
.fine a { color: color-mix(in srgb, var(--muted) 40%, var(--accent)); }

@media (max-width: 560px) {
  body { font-size: 16px; }
  h1 { font-size: 1.7rem; }
  h2 { font-size: 1.3rem; }
  header.site nav { gap: .85rem; font-size: .85rem; margin-left: 0; }
  .results .row.hero .v { font-size: 1.25rem; }
}