:root {
  --bg: #faf7f1;
  --panel: #f2ece1;
  --ink: #23201c;
  --ink-soft: #57514a;
  --rule: #e0d7c8;
  --accent: #2c5f52;
  --accent-soft: #dad9c9;
  --measure: 34rem;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --scale: 1;
}

html[data-theme="sepia"] {
  --bg: #f4ecd8;
  --panel: #e9dfc6;
  --ink: #3a2f22;
  --ink-soft: #6b5c48;
  --rule: #d8c9a8;
  --accent: #8a5a2b;
  --accent-soft: #e2d3b4;
}

html[data-theme="night"] {
  --bg: #16161a;
  --panel: #1e1e23;
  --ink: #ddd8cf;
  --ink-soft: #a09a91;
  --rule: #2c2c33;
  --accent: #8fb9a8;
  --accent-soft: #2a2a31;
}

html[data-size="s"] { --scale: 0.92; }
html[data-size="l"] { --scale: 1.1; }
html[data-size="xl"] { --scale: 1.22; }

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  font-size: calc(19px * var(--scale));
  line-height: 1.68;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.progress { position: fixed; inset: 0 0 auto 0; height: 3px; z-index: 40; background: transparent; }
.progress span { display: block; height: 100%; width: 0; background: var(--accent); opacity: .55; transition: width .15s linear; }

/* ---------- top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: center; gap: .6rem;
  padding: .55rem clamp(.8rem, 3vw, 2rem);
  background: var(--bg);
  border-bottom: 1px solid var(--rule);
  font-family: var(--sans);
}
@supports (backdrop-filter: blur(10px)) {
  .topbar { background: color-mix(in srgb, var(--bg) 86%, transparent); backdrop-filter: saturate(140%) blur(10px); }
}
.brand {
  flex: 1; min-width: 0;
  color: var(--ink-soft);
  font-size: .78rem; letter-spacing: .12em; text-transform: uppercase;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.brand:hover { color: var(--accent); text-decoration: none; }
.tools { display: flex; gap: .25rem; }
.icon-btn {
  appearance: none; border: 1px solid transparent; background: transparent; color: var(--ink-soft);
  min-width: 2.4rem; height: 2.4rem; padding: 0 .5rem; border-radius: .5rem; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--sans); font-size: .82rem; font-weight: 600; letter-spacing: .02em;
}
.icon-btn:hover { background: var(--panel); border-color: var(--rule); color: var(--ink); }
.icon-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---------- drawer ---------- */
.drawer {
  position: fixed; z-index: 50; top: 0; bottom: 0; left: 0;
  width: min(22rem, 88vw);
  background: var(--panel);
  border-right: 1px solid var(--rule);
  transform: translateX(-102%);
  transition: transform .22s ease;
  display: flex; flex-direction: column;
  font-family: var(--sans);
  box-shadow: 12px 0 40px -24px rgba(0, 0, 0, .5);
}
.drawer.open { transform: translateX(0); }
.drawer-head { display: flex; align-items: center; justify-content: space-between; padding: .9rem 1rem .5rem; }
.drawer-kicker { margin: 0; font-size: .72rem; letter-spacing: .16em; text-transform: uppercase; color: var(--ink-soft); }
.toc { list-style: none; margin: 0; padding: .2rem .6rem 2rem; overflow-y: auto; -webkit-overflow-scrolling: touch; }
.toc-item { margin: 0; }
.toc-item a { display: block; padding: .5rem .6rem; border-radius: .45rem; color: var(--ink); font-size: .86rem; line-height: 1.35; }
.toc-item a:hover { background: var(--accent-soft); text-decoration: none; }
.toc-part a { text-transform: uppercase; letter-spacing: .1em; font-size: .7rem; color: var(--ink-soft); margin-top: .9rem; }
.toc-item.is-current a { background: var(--accent-soft); color: var(--ink); font-weight: 600; }
.toc-num { color: var(--accent); font-variant-numeric: tabular-nums; margin-right: .15rem; }
.scrim { position: fixed; inset: 0; z-index: 45; background: rgba(20, 18, 15, .38); border: 0; padding: 0; }

/* ---------- article ---------- */
main { padding: 0 clamp(1rem, 4vw, 2rem); }

.page { max-width: var(--measure); margin: 0 auto; padding: clamp(1.6rem, 5vw, 3.4rem) 0 1rem; }

.kicker {
  font-family: var(--sans);
  font-size: .72rem; letter-spacing: .18em; text-transform: uppercase;
  color: var(--accent); margin: 0 0 .5rem;
}
.chap-head h1, .part-head h1 { font-size: 1.85em; line-height: 1.2; font-weight: 600; letter-spacing: -.01em; margin: 0 0 1.8rem; }
.part-head { padding: 3rem 0 1rem; border-bottom: 1px solid var(--rule); margin-bottom: 1.6rem; }
.part-head h1 { font-size: 2.1em; }

.page p { margin: 0; text-indent: 1.35em; }
.page > p:first-of-type, .page > header + p, .page blockquote p, .page li p { text-indent: 0; }
/* the epub nests body copy in wrapper divs, so the first paragraph after a heading
   must be matched through the div, not as a direct child of .page */
.page header + div p:first-child { text-indent: 0; }
.page .kicker { text-indent: 0; }

.page h2, .page h3, .page h4 { font-family: var(--serif); line-height: 1.25; margin: 2.2rem 0 .7rem; font-weight: 600; }
.page h2 { font-size: 1.3em; }
.page h3 { font-size: 1.12em; }
.page h4 { font-size: 1em; letter-spacing: .04em; text-transform: uppercase; color: var(--ink-soft); }
.page h2 + p, .page h3 + p, .page h4 + p { text-indent: 0; }

.page blockquote { margin: 1.6rem 0; padding: .2rem 0 .2rem 1.1rem; border-left: 3px solid var(--accent-soft); color: var(--ink-soft); font-style: italic; }
.page blockquote p { text-indent: 0; }

.page ul, .page ol { margin: 1rem 0 1rem 1.2rem; padding: 0; }
.page li { margin: .35rem 0; }

.page img { max-width: 100%; height: auto; display: block; margin: 1.4rem auto; border-radius: .3rem; }
.page hr { border: 0; border-top: 1px solid var(--rule); margin: 2rem 0; }

/* ---------- pager + footer ---------- */
.pager {
  max-width: var(--measure); margin: 2rem auto 0;
  display: grid; grid-template-columns: 1fr 1fr; gap: .8rem;
  border-top: 1px solid var(--rule); padding-top: 1.2rem;
  font-family: var(--sans);
}
.pager a { display: block; padding: .8rem .9rem; border: 1px solid var(--rule); border-radius: .6rem; color: var(--ink); background: var(--panel); }
.pager a:hover { border-color: var(--accent); text-decoration: none; }
.pager a span { display: block; font-size: .68rem; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-soft); }
.pager a strong { display: block; font-size: .86rem; font-weight: 600; margin-top: .2rem; line-height: 1.3; }
.pager .next { text-align: right; }

.foot {
  max-width: var(--measure); margin: 2.4rem auto 3rem;
  border-top: 1px solid var(--rule); padding-top: 1rem;
  font-family: var(--sans); color: var(--ink-soft); font-size: .72rem; line-height: 1.6;
}
.foot p { margin: .2rem 0; text-indent: 0; }
.foot .tiny { opacity: .8; }

/* ---------- landing ---------- */
.landing {
  max-width: 46rem; margin: 0 auto; padding: clamp(1.4rem, 4vw, 4rem) 0 2.5rem;
  display: grid; gap: clamp(1.4rem, 4vw, 3rem);
  grid-template-columns: minmax(0, 14rem) minmax(0, 1fr);
  align-items: start;
}
.cover { width: 100%; height: auto; aspect-ratio: 600 / 900; border-radius: .35rem; display: block; box-shadow: 0 18px 40px -18px rgba(30, 24, 16, .55), 0 2px 6px rgba(30, 24, 16, .18); }
.landing h1 { font-size: clamp(1.7rem, 4.4vw, 2.4rem); line-height: 1.14; margin: 0 0 .6rem; font-weight: 650; letter-spacing: -.015em; }
.landing .sub { color: var(--ink-soft); font-size: 1.02em; margin: 0 0 1rem; }
.landing .byline { font-family: var(--sans); font-size: .84rem; letter-spacing: .04em; color: var(--ink); margin: 0 0 .25rem; }
.landing .edition { font-family: var(--sans); font-size: .72rem; letter-spacing: .12em; text-transform: uppercase; color: var(--accent); margin: 0 0 1.5rem; line-height: 1.5; }
.cta { display: flex; flex-wrap: wrap; gap: .6rem; margin-bottom: 1.6rem; font-family: var(--sans); }
.btn { display: inline-flex; align-items: center; gap: .5rem; padding: .8rem 1.3rem; border-radius: .6rem; font-size: .9rem; font-weight: 600; background: var(--accent); color: var(--bg); border: 1px solid var(--accent); }
.btn:hover { filter: brightness(1.08); text-decoration: none; }
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--rule); font-weight: 500; }
.btn.ghost:hover { border-color: var(--accent); }

@media (max-width: 640px) {
  .landing { grid-template-columns: 1fr; justify-items: center; text-align: center; padding-top: 1.2rem; }
  .landing .cover { width: min(9.5rem, 42vw); }
  .landing h1 { font-size: 1.7rem; margin-top: .4rem; }
  .landing .sub { font-size: .95em; }
  .cta { justify-content: center; }
  .contents-list { text-align: left; }
  .contents-list a { gap: .5rem; }
  .contents-list .n { min-width: 1.1rem; }
}

.contents-list { font-family: var(--sans); border-top: 1px solid var(--rule); padding-top: 1rem; }
.contents-list h2 { font-family: var(--sans); font-size: .72rem; letter-spacing: .16em; text-transform: uppercase; color: var(--ink-soft); margin: 0 0 .6rem; font-weight: 600; }
.contents-list ol { list-style: none; margin: 0; padding: 0; }
.contents-list li { margin: 0; }
.contents-list a { display: flex; gap: .7rem; padding: .55rem .1rem; border-bottom: 1px dotted var(--rule); color: var(--ink); font-size: .88rem; }
.contents-list a:hover { color: var(--accent); text-decoration: none; }
.contents-list .n { color: var(--accent); min-width: 1.4rem; font-variant-numeric: tabular-nums; }
.contents-list .part-row a { text-transform: uppercase; letter-spacing: .1em; font-size: .7rem; color: var(--ink-soft); border-bottom: 1px solid var(--rule); padding-top: 1rem; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .drawer, .progress span { transition: none; }
}

@media print {
  .topbar, .drawer, .scrim, .pager, .progress { display: none !important; }
  body { background: #fff; color: #000; font-size: 11pt; }
  .page { max-width: none; padding: 0; }
  a { color: #000; }
}