/* The Single Source - author site. No external fonts, scripts or images. */

:root {
  --paper: #f4efe8;
  --paper-2: #ebe3d9;
  --ink: #1d1517;
  --muted: #62575a;
  --wine: #6e1c36;
  --wine-ink: #f7eef0;
  --rose: #b8606e;
  --line: #d9cec3;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --measure: 38rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #161112;
    --paper-2: #1f1819;
    --ink: #eee5de;
    --muted: #a9999c;
    --wine: #c9798a;
    --wine-ink: #1a1012;
    --rose: #d08c98;
    --line: #3a2f31;
  }
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.125rem;
  line-height: 1.6;
  padding-inline: 1.25rem;
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--wine); text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible { outline: 2px solid var(--rose); outline-offset: 3px; }

/* --- header / footer --- */

.site-header,
main,
.site-footer {
  max-width: 64rem;
  margin-inline: auto;
}

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem 2rem;
  padding-block: 1.75rem 1.25rem;
  border-bottom: 1px solid var(--line);
}

.wordmark {
  color: var(--ink);
  text-decoration: none;
  font-size: 1.05rem;
  letter-spacing: 0.32em;
  text-transform: uppercase;
}

.site-header nav { display: flex; flex-wrap: wrap; gap: 0.25rem 1.5rem; }

.site-header nav a {
  font-family: var(--sans);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
}
.site-header nav a:hover,
.site-header nav a[aria-current="page"] { color: var(--ink); }

.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 5rem;
  padding-block: 1.5rem 3rem;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.8rem;
}

/* --- type --- */

h1, h2, h3 { font-weight: 600; line-height: 1.15; margin: 0; }

h1 { font-size: clamp(2.4rem, 7vw, 4rem); letter-spacing: -0.01em; }
h2 { font-size: clamp(1.8rem, 4.5vw, 2.5rem); }
h3 { font-size: 1.1rem; }

p { margin: 0 0 1em; }

.eyebrow {
  font-family: var(--sans);
  font-size: 0.75rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 0.6rem;
}

/* --- intro --- */

.intro {
  max-width: var(--measure);
  padding-block: 4rem 3rem;
}

.intro h1 { margin-bottom: 1.5rem; }

.lede {
  font-size: 1.35rem;
  line-height: 1.45;
}

.intro p:not(.eyebrow):not(.lede) { color: var(--muted); }

/* --- books --- */

.book {
  display: grid;
  grid-template-columns: minmax(0, 17rem) minmax(0, var(--measure));
  gap: 2.5rem 3.5rem;
  align-items: start;
  padding-block: 3.5rem;
  border-top: 1px solid var(--line);
}

.cover {
  display: block;
  position: sticky;
  top: 1.5rem;
}

.cover img {
  width: 100%;
  box-shadow: 0 1px 2px rgb(0 0 0 / 0.12), 0 18px 40px -18px rgb(0 0 0 / 0.45);
}

.book h2 { margin-bottom: 0.4rem; }

.subtitle {
  font-style: italic;
  color: var(--muted);
  margin-bottom: 1.5rem;
}

.cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem 1.25rem;
  margin-bottom: 2rem;
}

.button {
  display: inline-block;
  background: var(--wine);
  color: var(--wine-ink);
  font-family: var(--sans);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 0.8rem 1.4rem;
  border-radius: 2px;
}
.button:hover { filter: brightness(1.12); }

.aside, .soon {
  font-family: var(--sans);
  font-size: 0.85rem;
  color: var(--muted);
}

.soon {
  border: 1px solid var(--line);
  padding: 0.7rem 1.2rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.blurb p:last-child { font-style: italic; }

.warnings {
  margin-top: 2rem;
  padding: 1.25rem 1.5rem;
  background: var(--paper-2);
  border-left: 3px solid var(--rose);
  font-size: 0.95rem;
}

.warnings h3 {
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.6rem;
}

.warnings p:last-child { margin-bottom: 0; }

/* --- before / about --- */

.before, .about {
  max-width: var(--measure);
  padding-block: 3.5rem 0;
  border-top: 1px solid var(--line);
}

.before h2, .about h2 { margin-bottom: 1.25rem; }

/* --- content list --- */

.toc {
  list-style: none;
  padding: 0;
  margin: 2rem 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  font-family: var(--sans);
  font-size: 0.9rem;
}

.list {
  max-width: var(--measure);
  padding-block: 3rem 1rem;
  border-top: 1px solid var(--line);
  scroll-margin-top: 1rem;
}

.list h2 { margin-bottom: 1.25rem; }

.group { margin-top: 2rem; }

.group h3 {
  font-family: var(--sans);
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--wine);
  margin-bottom: 0.75rem;
}

.group ul { margin: 0; padding-left: 1.2rem; }
.group li { margin-bottom: 0.45rem; }
.group li::marker { color: var(--rose); }

.back { margin-top: 2rem; font-family: var(--sans); font-size: 0.85rem; }

/* --- narrow --- */

@media (max-width: 46rem) {
  body { font-size: 1.05rem; }
  .intro { padding-block: 2.75rem 2rem; }
  .book { grid-template-columns: 1fr; gap: 2rem; padding-block: 2.75rem; }
  .cover { position: static; max-width: 12rem; }
}