/* Preface to the Trivium. Plain book style: Libre Caslon, cream paper,
   one wide centered column, large type, stacked centered buttons. */

:root {
  --paper: #f8f1e1;
  --ink: #2a2118;
  --wine: #7a1f2b;
  --sepia: #6b4a2b;
  --navy: #24395c;
  --line: #d3c29c;
  --tint: #efe5cf;
  --text: "Libre Caslon Text", Georgia, "Times New Roman", serif;
  --display: "Libre Caslon Display", "Libre Caslon Text", Georgia, serif;
  --bar: 64px;
  color-scheme: light;
}
body.dark {
  --paper: #1d1812;
  --ink: #efe3c6;
  --wine: #e3a1a8;
  --sepia: #d9c7a0;
  --navy: #a9bde0;
  --line: #6b5a3c;
  --tint: #2a231a;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { font-size: 21px; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  padding-top: var(--bar);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--text);
  line-height: 1.7;
}

a { color: var(--navy); text-underline-offset: 0.15em; }
a:hover, a:focus { color: var(--wine); }
:focus-visible { outline: 3px solid var(--wine); outline-offset: 3px; }

.skip {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--paper); color: var(--ink);
  border: 2px solid var(--wine); padding: 10px 16px;
}
.skip:focus { left: 12px; top: 12px; }

/* ---- fixed top bar and controls --------------------------------------- */

.top {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--bar);
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  z-index: 40;
}
.top .in {
  max-width: 920px; height: 100%; margin: 0 auto; padding: 0 30px;
  display: flex; align-items: center; gap: 28px;
}
.top a { color: var(--navy); font-size: 0.95rem; text-decoration: none; }
.top a:hover, .top a:focus { color: var(--wine); text-decoration: underline; }
.top .top-course { color: var(--sepia); }

.top-right-controls {
  position: fixed; top: 0; right: 16px; height: var(--bar);
  display: flex; align-items: center; gap: 10px;
  z-index: 50;
}
#speak-toggle, .speak-rate-btn, #dark-toggle {
  font-family: var(--text);
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--line);
  cursor: pointer;
  height: 44px;
  line-height: 1;
}
.speak-unit { display: inline-flex; position: relative; }
#speak-toggle { width: 48px; font-size: 18px; border-right: 0; }
.speak-rate { display: flex; }
.speak-rate-btn { min-width: 34px; font-size: 14px; padding: 0 8px; appearance: none; -webkit-appearance: none; }
#dark-toggle { font-size: 1rem; padding: 0 16px; }
#speak-toggle:hover, .speak-rate-btn:hover, .speak-rate.open .speak-rate-btn, #dark-toggle:hover,
#speak-toggle:focus-visible, .speak-rate-btn:focus-visible, #dark-toggle:focus-visible {
  border-color: var(--wine); color: var(--wine);
}
/* play and speed buttons highlight as one unit, so the divider between them changes too */
.speak-unit:hover #speak-toggle, .speak-unit:hover .speak-rate-btn,
.speak-unit:focus-within #speak-toggle, .speak-unit:focus-within .speak-rate-btn {
  border-color: var(--wine); color: var(--wine); background: var(--tint);
}
#speak-toggle.speaking, #speak-toggle.speaking:hover { background: var(--wine); color: var(--paper); border-color: var(--wine); }

.speak-rate-menu {
  position: absolute; top: calc(100% + 6px); right: 0;
  margin: 0; padding: 4px; list-style: none; min-width: 5em;
  background: var(--paper); border: 1px solid var(--line);
}
.speak-rate-menu[hidden] { display: none; }
.speak-rate-menu li { font-size: 0.9rem; padding: 6px 14px; cursor: pointer; white-space: nowrap; color: var(--ink); }
.speak-rate-menu li:hover, .speak-rate-menu li:focus { color: var(--wine); background: var(--tint); }
.speak-rate-menu li[aria-selected="true"] { color: var(--wine); font-weight: 700; }

/* ---- page column ------------------------------------------------------ */

.app { display: block; }
.toc, #nav-toggle, .toc-scrim, .rule { display: none !important; }

main.main { max-width: 920px; margin: 0 auto; padding: 40px 30px 70px; }

.page-head { margin-bottom: 1.4em; }
.kicker { text-align: center; color: var(--sepia); font-size: 0.95rem; letter-spacing: 0.08em; margin: 0; }
.draft { display: block; text-align: center; color: var(--sepia); font-size: 0.85rem; }
h1 {
  font-family: var(--display); font-weight: 400; text-align: center;
  font-size: 3.3rem; line-height: 1.1; margin: 0.2em 0 0.5em; color: var(--ink);
}
h2 { font-family: var(--display); font-weight: 400; font-size: 2.1rem; line-height: 1.2; margin: 1.6em 0 0.4em; }
h3 { font-family: var(--display); font-weight: 400; font-size: 1.45rem; line-height: 1.25; margin: 1.3em 0 0.3em; }

.prose p { margin: 0 0 1em; }
.sc { font-variant: small-caps; font-variant-caps: small-caps; font-synthesis: weight style small-caps; letter-spacing: .04em; }
.prose ul, .prose ol { padding-left: 1.4em; margin: 0 0 1em; }
.prose li { margin-bottom: 0.4em; }
.prose code { font-family: var(--text); font-size: 0.9em; color: var(--sepia); word-break: break-all; }
hr, .prose hr { border: 0; border-top: 1px solid var(--line); margin: 40px 0; }

.prose p.continue { margin-top: 1.6em; padding-top: 1em; border-top: 1px solid var(--line); }

.prose blockquote { margin: 1.2em 0; padding: 0 0 0 1.1em; border-left: 2px solid var(--line); }
.prose blockquote footer { font-size: 0.9em; margin-top: 0.4em; color: var(--sepia); }

.prose table { width: 100%; border-collapse: collapse; margin: 1.2em 0; font-size: 0.9rem; display: block; overflow-x: auto; }
.prose th, .prose td { border: 1px solid var(--line); padding: 10px 12px; text-align: left; vertical-align: top; }
.prose thead th { color: var(--sepia); font-weight: 400; }

.note, .need { margin: 1.2em 0; padding: 14px 18px; border: 1px solid var(--line); }

/* ---- stacked centered buttons ----------------------------------------- */

.btns, .apps, .cards, .pager {
  display: flex; flex-direction: column; align-items: center; gap: 14px;
  margin: 28px 0 36px;
}
.b, .app-link, .card {
  display: block; width: min(560px, 100%);
  text-align: center; color: var(--ink); background: var(--paper);
  border: 1px solid var(--line); padding: 14px 20px;
  text-decoration: none; font-size: 1.08rem; line-height: 1.45;
}
.b small, .app-link span {
  display: block; color: var(--sepia); font-size: 0.85rem; margin-bottom: 2px;
}
.app-link span { margin: 2px 0 0; }
.b:hover, .b:focus, .app-link:hover, .app-link:focus, .card:hover, .card:focus {
  border-color: var(--wine); color: var(--wine);
}
.b.main { border: 2px solid var(--wine); color: var(--wine); }
p > .app-link { margin: 0 auto; }
.card h3 { margin: 0 0 0.2em; font-size: 1.3rem; color: inherit; }
.card p { margin: 0; color: var(--sepia); font-size: 0.9rem; }
.pager { margin-top: 44px; }


.designer-credit {
  text-align: center; color: var(--sepia); font-size: 0.95rem; font-style: italic;
  margin: 40px auto 0; max-width: 40rem;
}
.si-home { text-align: center; margin: 40px 0 0; font-size: 0.95rem; font-style: italic; }

/* ---- small screens ---------------------------------------------------- */

@media (max-width: 760px) {
  html { font-size: 19px; }
  .top .top-course { display: none; }
  .top .in { padding: 0 16px; }
  .top-right-controls { right: 10px; gap: 6px; }
  main.main { padding: 28px 18px 56px; }
  h1 { font-size: 2.4rem; }
  h2 { font-size: 1.7rem; }
}
@media print {
  .top, .top-right-controls { display: none; }
  body { padding-top: 0; }
}