/* Signal Through — field guide stylesheet (brand tokens from site/index.html) */
:root {
  --ground: #f7f5f0;
  --panel: #ffffff;
  --ink: #0d1522;
  --ink-soft: #33404f;
  --ink-faint: #66717f;
  --accent: #c0562a;
  --accent-tint: #f4e6dd;
  --line: #e3ddd1;
  --mono-bg: #efece4;
  --shadow: 0 1px 3px rgba(13, 21, 34, 0.08);
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, ui-serif, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ground: #0b1220;
    --panel: #0f1e33;
    --ink: #e9e4d8;
    --ink-soft: #c2bcae;
    --ink-faint: #8a8578;
    --accent: #cf6a3e;
    --accent-tint: #2a1d14;
    --line: #22304a;
    --mono-bg: #16233a;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  background: var(--ground);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: 1.65;
  margin: 0;
  padding: 0 1.25rem 5rem;
}

/* Site nav band */
.site-nav {
  margin: 0 -1.25rem 2rem;
  padding: 0.85rem 1.25rem;
  border-bottom: 2px solid var(--accent);
  background: var(--panel);
}
.site-nav .inner {
  max-width: 46rem;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4rem 1.4rem;
  font-family: var(--sans);
  font-size: 0.85rem;
  font-weight: 600;
}
.site-nav a { color: var(--accent); text-decoration: none; }
.site-nav a:hover { text-decoration: underline; }
.site-nav .brand {
  color: var(--ink);
  font-weight: 700;
  letter-spacing: 0.02em;
}

/* Pandoc title block */
header#title-block-header { max-width: 46rem; margin: 0 auto 2rem; }
header#title-block-header h1.title {
  font-family: var(--sans);
  font-size: clamp(1.7rem, 4.5vw, 2.4rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.015em;
  margin: 1rem 0 0;
  text-wrap: balance;
}

/* TOC */
nav#TOC {
  max-width: 46rem;
  margin: 0 auto 2.5rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: 1.25rem 1.75rem;
}
nav#TOC::before {
  content: "On this page";
  display: block;
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 0.75rem;
}
nav#TOC ul { margin: 0; padding-left: 1.3rem; }
nav#TOC li { margin-bottom: 0.35rem; }
nav#TOC a { text-decoration: none; }
nav#TOC a:hover { text-decoration: underline; }

/* Content column */
body > *:not(.site-nav):not(#title-block-header):not(#TOC),
section, article {
  max-width: 46rem;
  margin-left: auto;
  margin-right: auto;
}

h1, h2, h3, h4 {
  font-family: var(--sans);
  line-height: 1.2;
  letter-spacing: -0.01em;
  text-wrap: balance;
}
h1 { font-size: 1.9rem; font-weight: 700; margin: 3rem auto 0.5rem; }
h2 {
  font-size: 1.55rem; font-weight: 700; margin: 3.5rem auto 0.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
}
h3 { font-size: 1.15rem; font-weight: 650; margin: 2.25rem auto 0.5rem; }
h4 { font-size: 1rem; font-weight: 650; margin: 1.75rem auto 0.4rem; }

p { margin: 0 auto 1rem; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
strong { font-weight: 650; }

ul, ol { padding-left: 1.5rem; margin: 0 auto 1rem; }
li { margin-bottom: 0.45rem; }
li > ul, li > ol { margin-top: 0.45rem; }

code {
  font-family: "Cascadia Mono", Consolas, "SF Mono", Menlo, monospace;
  font-size: 0.85em;
  background: var(--mono-bg);
  border-radius: 4px;
  padding: 0.1em 0.4em;
}
pre {
  background: var(--mono-bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  margin: 1rem auto 1.5rem;
}
pre code { background: none; padding: 0; font-size: 0.85rem; line-height: 1.55; }

/* Callout blockquotes */
blockquote {
  margin: 1.25rem auto 1.5rem;
  padding: 1rem 1.25rem;
  background: var(--accent-tint);
  border: none;
  border-left: 3px solid var(--accent);
  border-radius: 8px;
}
blockquote p { margin-bottom: 0.6rem; }
blockquote p:last-child { margin-bottom: 0; }

/* Tables */
table {
  border-collapse: collapse;
  width: 100%;
  max-width: 46rem;
  margin: 1.25rem auto 1.5rem;
  font-size: 0.95rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  display: block;
  overflow-x: auto;
}
th {
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  text-align: left;
  padding: 0.75rem 1rem;
  border-bottom: 2px solid var(--accent);
}
td {
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
tr:last-child td { border-bottom: none; }

hr {
  border: none;
  border-top: 1px solid var(--line);
  max-width: 46rem;
  margin: 3rem auto;
}

em { font-style: italic; }

.site-footer {
  max-width: 46rem;
  margin: 4rem auto 0;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  font-size: 0.88rem;
  color: var(--ink-faint);
  font-family: var(--sans);
}
.site-footer a { color: var(--accent); }