/* ---------- colours (light is the default; sepia and dark are optional) ---------- */
:root {
  --fs: 19px;
  --bg: #fbfaf7;
  --fg: #1f1d1a;
  --muted: #6d675c;
  --line: #dcd6ca;
  --card: #ffffff;
  --accent: #7a5c2e;
  --link: #1d5aa6;
  --mark: #ffe28a;
  --bar: rgba(251, 250, 247, 0.92);
  --shadow: 0 10px 30px rgba(30, 25, 15, 0.14);
  color-scheme: light;
}
:root[data-theme="sepia"] {
  --bg: #f4ecd8;
  --fg: #3a2e1d;
  --muted: #7a6a51;
  --line: #dccdab;
  --card: #fbf4e3;
  --accent: #7a4f17;
  --link: #8a4b0f;
  --mark: #f2c766;
  --bar: rgba(244, 236, 216, 0.92);
}
:root[data-theme="dark"] {
  --bg: #17181b;
  --fg: #dcd8d0;
  --muted: #9b968c;
  --line: #34363b;
  --card: #1f2024;
  --accent: #d2ad6e;
  --link: #8db7f5;
  --mark: #6a5714;
  --bar: rgba(23, 24, 27, 0.92);
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  color-scheme: dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --bg: #17181b;
    --fg: #dcd8d0;
    --muted: #9b968c;
    --line: #34363b;
    --card: #1f2024;
    --accent: #d2ad6e;
    --link: #8db7f5;
    --mark: #6a5714;
    --bar: rgba(23, 24, 27, 0.92);
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 72px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: "Charis SIL", Charter, "Bitstream Charter", Georgia, serif;
  font-size: var(--fs);
  line-height: 1.6;
}
a { color: var(--link); }
button { font: inherit; color: inherit; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 8px; top: 8px; z-index: 99; background: var(--card); padding: 6px 10px; }

/* ---------- top bar ---------- */
.bar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 4px;
  height: 56px; padding: 0 8px;
  background: var(--bar);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 15px;
}
.brand {
  flex: 1; min-width: 0;
  display: flex; align-items: center; gap: 8px;
  color: var(--fg); text-decoration: none; font-weight: 600;
  padding: 0 6px;
}
.brand span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.brand svg, .icon-btn svg, .search-field svg {
  width: 22px; height: 22px; flex: none;
  fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round;
}
.brand svg { color: var(--accent); }
.icon-btn {
  display: grid; place-items: center;
  width: 44px; height: 44px; border: 0; border-radius: 10px;
  background: transparent; cursor: pointer;
}
.icon-btn:hover, .icon-btn[aria-expanded="true"] { background: color-mix(in srgb, var(--fg) 8%, transparent); }
.progress { position: absolute; left: 0; right: 0; bottom: -1px; height: 2px; }
.progress i { display: block; height: 100%; width: 0; background: var(--accent); }

/* ---------- the book text ---------- */
main { padding: 0 16px 48px; }
.book {
  max-width: 34em;
  margin: 0 auto;
  padding: 1.5em 0 1em;
  overflow-wrap: break-word;
}
.book p, .book li {
  margin: 0 0 0.8em;
  text-align: justify;
  -webkit-hyphens: auto;
  hyphens: auto;
}
.book ul, .book ol { margin: 0 0 0.8em; padding-left: 1.5em; }
.book li { margin-bottom: 0.4em; }
.book li > p { margin: 0; }
.book p.c, .book .c, .book .center, .book .center p { text-align: center; }
.book .sc { font-variant-caps: all-small-caps; letter-spacing: 0.03em; }
.book h1, .book h2, .book h3 { line-height: 1.3; font-weight: 700; text-align: center; }
.book h1 { font-size: 1.45em; margin: 1.1em 0 0.9em; }
.book h1.label { font-size: 1.15em; margin: 0.6em 0 0.3em; color: var(--muted); letter-spacing: 0.02em; }
.book h1.part { font-size: 1.75em; margin: 0.4em 0 1em; }
.book h2 { font-size: 1.15em; margin: 1.5em 0 0.6em; }
.book h3 { font-size: 1em; margin: 1.3em 0 0.5em; }
.book .entry { margin-top: 1.4em; }
.book h1.entry { margin-top: 0.6em; }
.book img.orn { width: 2em; height: auto; vertical-align: middle; margin: 0 0.35em; }
.book img.orn.divider { width: 2.2em; }
.book .box {
  border: 1.5px solid var(--fg);
  padding: 1em 1.15em;
  margin: 1.6em 0;
}
.book .box > h3:first-child { margin-top: 0.2em; }
.book .box > :last-child { margin-bottom: 0; }
.book figure { margin: 1.4em auto; max-width: 100%; }
.book figure img { display: block; width: 100%; height: auto; }
.book hr { border: 0; border-top: 1px solid var(--fg); margin: 1.2em auto; }
.book .dropcap {
  float: left;
  font-size: 3.5em;
  line-height: 0.82;
  margin: 0.06em 0.06em 0 0;
}
.book sup { line-height: 0; }
.book mark { background: var(--mark); color: inherit; border-radius: 2px; }
.book [id] { scroll-margin-top: 72px; }

/* pictures and decorations on dark/sepia themes: keep them readable */
:root[data-theme="dark"] .book figure img { background: #fff; padding: 6px; border-radius: 4px; }
:root[data-theme="dark"] .book img.orn { filter: invert(0.85); }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .book figure img { background: #fff; padding: 6px; border-radius: 4px; }
  :root:not([data-theme]) .book img.orn { filter: invert(0.85); }
}
:root[data-theme="sepia"] .book figure img { mix-blend-mode: multiply; }

/* ---------- previous / next ---------- */
.pager {
  max-width: 34em; margin: 2.5em auto 0;
  display: grid; grid-template-columns: 1fr 1fr; gap: 12px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; font-size: 15px;
}
.pager a {
  display: flex; flex-direction: column; gap: 2px;
  padding: 12px 14px; border: 1px solid var(--line); border-radius: 12px;
  background: var(--card); color: var(--fg); text-decoration: none; min-width: 0;
}
.pager a:hover { border-color: var(--accent); }
.pager small { color: var(--muted); }
.pager span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: 600; }
.pager .next { text-align: right; }

/* ---------- side menu (contents) ---------- */
.scrim {
  position: fixed; inset: 0; z-index: 30;
  background: rgba(0, 0, 0, 0.35);
  opacity: 0; pointer-events: none; transition: opacity 0.2s;
}
.scrim.on { opacity: 1; pointer-events: auto; }
.drawer {
  position: fixed; top: 0; bottom: 0; left: 0; z-index: 31;
  width: min(360px, 88vw);
  background: var(--card); box-shadow: var(--shadow);
  transform: translateX(-102%); transition: transform 0.22s ease;
  display: flex; flex-direction: column;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; font-size: 15px;
}
.drawer.on { transform: none; }
.drawer-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 8px 8px 18px; border-bottom: 1px solid var(--line); font-weight: 600;
}
.drawer .toc-tree { overflow-y: auto; padding: 8px 8px 40px; flex: 1; }
.toc-tree ul { list-style: none; margin: 0; padding: 0; }
.toc-tree ul ul { padding-left: 14px; }
.toc-tree a {
  display: block; padding: 7px 10px; border-radius: 8px;
  color: var(--fg); text-decoration: none; line-height: 1.35;
}
.toc-tree a:hover { background: color-mix(in srgb, var(--fg) 7%, transparent); }
.toc-tree a.current { background: color-mix(in srgb, var(--accent) 16%, transparent); font-weight: 600; }
.toc-tree .sub a { color: var(--muted); font-size: 14px; padding: 5px 10px; }
.toc-tree details > summary {
  list-style: none; cursor: pointer;
  display: flex; align-items: center;
}
.toc-tree details > summary::-webkit-details-marker { display: none; }
.toc-tree details > summary a { flex: 1; }
.toc-tree details > summary::after {
  content: ""; width: 8px; height: 8px; margin: 0 12px 0 6px; flex: none;
  border-right: 2px solid var(--muted); border-bottom: 2px solid var(--muted);
  transform: rotate(-45deg); transition: transform 0.15s;
}
.toc-tree details[open] > summary::after { transform: rotate(45deg); }

/* ---------- reading settings ---------- */
.settings {
  position: fixed; top: 62px; right: 10px; z-index: 32;
  width: min(300px, calc(100vw - 20px));
  padding: 14px; border: 1px solid var(--line); border-radius: 14px;
  background: var(--card); box-shadow: var(--shadow);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; font-size: 14px;
}
.settings[hidden] { display: none; }
.settings h4 { margin: 0 0 8px; font-size: 13px; color: var(--muted); font-weight: 600; }
.settings .row { display: flex; gap: 6px; margin-bottom: 14px; }
.settings .row:last-child { margin-bottom: 0; }
.settings button {
  flex: 1; min-height: 40px; border: 1px solid var(--line); border-radius: 10px;
  background: transparent; cursor: pointer;
}
.settings button.on { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 14%, transparent); font-weight: 600; }
.settings .size { display: grid; place-items: center; flex: 1; color: var(--muted); }

/* ---------- search ---------- */
.search {
  position: fixed; inset: 0; z-index: 40;
  background: color-mix(in srgb, var(--bg) 96%, transparent);
  display: flex; flex-direction: column; align-items: center;
  padding: 12px 16px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; font-size: 15px;
}
.search[hidden] { display: none; }
.search-box { display: flex; gap: 8px; width: 100%; max-width: 720px; }
.search-box input {
  flex: 1; min-width: 0; height: 48px; padding: 0 14px;
  border: 1.5px solid var(--line); border-radius: 12px;
  background: var(--card); color: var(--fg); font-size: 17px;
}
.search-box input:focus { outline: none; border-color: var(--accent); }
.search-box button { border: 0; background: transparent; padding: 0 10px; cursor: pointer; color: var(--muted); }
.search-info { width: 100%; max-width: 720px; color: var(--muted); padding: 10px 4px 4px; font-size: 13px; }
.search-results { width: 100%; max-width: 720px; overflow-y: auto; flex: 1; list-style: none; margin: 0; padding: 0 0 40px; }
.search-results a {
  display: block; padding: 12px 12px; border-radius: 10px;
  color: var(--fg); text-decoration: none; border-bottom: 1px solid var(--line);
}
.search-results a:hover, .search-results a:focus { background: var(--card); outline: none; }
.search-results b { display: block; margin-bottom: 3px; }
.search-results span { color: var(--muted); font-family: "Charis SIL", Georgia, serif; font-size: 15px; line-height: 1.45; }
.search-results mark { background: var(--mark); color: var(--fg); }
.hl-chip {
  position: fixed; left: 50%; bottom: 18px; transform: translateX(-50%); z-index: 15;
  display: flex; align-items: center; gap: 8px;
  padding: 8px 8px 8px 14px; border-radius: 999px;
  background: var(--card); border: 1px solid var(--line); box-shadow: var(--shadow);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; font-size: 14px;
}
.hl-chip button { border: 0; border-radius: 999px; padding: 4px 10px; cursor: pointer; background: color-mix(in srgb, var(--fg) 8%, transparent); }

/* ---------- home page ---------- */
.home { max-width: 980px; margin: 0 auto; padding: 24px 0 40px; }
.hero { display: flex; gap: 32px; align-items: center; padding: 8px 0 28px; }
.cover { width: 220px; max-width: 42%; height: auto; border-radius: 6px; box-shadow: var(--shadow); flex: none; }
.hero h1 { font-size: 2em; line-height: 1.2; margin: 0 0 0.25em; }
.author { margin: 0 0 1.2em; color: var(--muted); font-size: 1.05em; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 16px; }
.btn {
  display: inline-flex; align-items: center; min-height: 44px; padding: 0 16px;
  border: 1px solid var(--line); border-radius: 12px; background: var(--card);
  color: var(--fg); text-decoration: none;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; font-size: 15px; font-weight: 600;
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
:root[data-theme="dark"] .btn.primary { color: #17181b; }
@media (prefers-color-scheme: dark) { :root:not([data-theme]) .btn.primary { color: #17181b; } }
.btn[hidden] { display: none; }
.search-field {
  display: flex; align-items: center; gap: 10px; width: 100%; max-width: 460px; height: 48px; padding: 0 14px;
  border: 1.5px solid var(--line); border-radius: 12px; background: var(--card); color: var(--muted); cursor: text;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; font-size: 15px; text-align: left;
}
.panel { border-top: 1px solid var(--line); padding: 20px 0; }
.panel h2 { font-size: 1.3em; margin: 0.2em 0 0.7em; }
.panel .toc-tree { font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; font-size: 15px; columns: 2 320px; column-gap: 28px; }
.panel .toc-tree > ul > li { break-inside: avoid; margin-bottom: 6px; }
.letters { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 16px; font-family: system-ui, -apple-system, sans-serif; }
.letters a {
  display: grid; place-items: center; width: 38px; height: 38px; border-radius: 10px;
  border: 1px solid var(--line); background: var(--card); color: var(--fg); text-decoration: none; font-weight: 600;
}
.az { columns: 3 220px; column-gap: 28px; }
.az-group { break-inside: avoid; margin-bottom: 14px; scroll-margin-top: 70px; }
.az-group h3 { margin: 0 0 4px; color: var(--accent); font-size: 1.05em; }
.az-group ul { list-style: none; margin: 0; padding: 0; }
.az-group li { padding: 3px 0; line-height: 1.35; }
.az-group a { color: var(--fg); text-decoration: none; }
.az-group a:hover { color: var(--link); text-decoration: underline; }
.az-group li.see a { color: var(--muted); font-style: italic; }

@media (max-width: 640px) {
  :root { --fs: 18px; }
  .hero { flex-direction: column; align-items: flex-start; gap: 18px; }
  .cover { width: 150px; }
  .hero h1 { font-size: 1.55em; }
  .book { padding-top: 1em; }
  .pager { grid-template-columns: 1fr; }
  .pager .next { text-align: left; }
}
@media print {
  .bar, .pager, .drawer, .scrim, .settings, .search, .hl-chip { display: none !important; }
  body { background: #fff; color: #000; }
}

/* ---------- tables ---------- */
.book table.tbl { width: 100%; border-collapse: collapse; margin: 1em 0 1.2em; line-height: 1.5; }
.book .tbl th { text-align: left; vertical-align: bottom; padding: 0.2em 0.6em 0.35em 0; border-bottom: 1.5px solid var(--fg); }
.book .tbl td { vertical-align: top; padding: 0.4em 0.6em 0.4em 0; }
.book .tbl tr > :first-child { width: 26%; }