/* ============ Design tokens ============ */
:root {
  --page-w: 860px;           /* top bar, page and chapter buttons all share this width */
  --bg: #f6f2ea;
  --surface: #fffdf9;
  --ink: #1c1917;
  --ink-soft: #57534e;
  --ink-faint: #a8a29e;
  --line: #e9e3d8;
  --accent: #ea580c;
  --accent-soft: #fff1e6;
  --shadow: 0 1px 2px rgba(28, 25, 23, .05), 0 12px 32px rgba(28, 25, 23, .07);
  --font-ui: "Inter", "Noto Sans Devanagari", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-display: "Fraunces", "Noto Serif Devanagari", Georgia, serif;
  --font-read: "Literata", "Noto Serif Devanagari", Georgia, serif;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]):not([data-theme="sepia"]) {
    --bg: #100e0c;
    --surface: #1a1715;
    --ink: #f3efe9;
    --ink-soft: #c9c2ba;
    --ink-faint: #7d756d;
    --line: #2d2825;
    --accent: #fb923c;
    --accent-soft: #2b1b10;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 12px 32px rgba(0, 0, 0, .35);
  }
}
:root[data-theme="dark"] {
  --bg: #100e0c;
  --surface: #1a1715;
  --ink: #f3efe9;
  --ink-soft: #c9c2ba;
  --ink-faint: #7d756d;
  --line: #2d2825;
  --accent: #fb923c;
  --accent-soft: #2b1b10;
  --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 12px 32px rgba(0, 0, 0, .35);
}
:root[data-theme="sepia"] {
  --bg: #efe5cf;
  --surface: #f8f0dc;
  --ink: #3b2f22;
  --ink-soft: #5f4b36;
  --ink-faint: #9c8a72;
  --line: #e0d2b2;
  --accent: #b45309;
  --accent-soft: #f0dfb9;
}

/* ============ Base ============ */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-ui);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  transition: background .25s, color .25s;
}
a { color: var(--accent); }
button { font: inherit; color: inherit; cursor: pointer; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
[hidden] { display: none !important; }

.icon-btn {
  flex: none;
  width: 42px; height: 42px; border-radius: 12px;
  border: 1px solid var(--line); background: var(--surface);
  color: var(--ink); text-decoration: none;
  display: grid; place-items: center;
  transition: border-color .2s, background .2s;
}
.icon-btn:hover { border-color: var(--accent); }
.icon-btn svg { width: 18px; height: 18px; }
.icon-btn .aa { font-family: Georgia, serif; font-weight: 700; font-size: 1.05rem; }

/* ============ Top bar ============ */
.reader-bar {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.bar-inner {
  max-width: var(--page-w); margin: 0 auto;
  padding: 10px 16px;
  display: flex; align-items: center; gap: 10px;
}
.book-name {
  flex: 1; min-width: 0;
  font-weight: 600; font-size: .95rem; line-height: 1.3;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.book-name small {
  display: block; overflow: hidden; text-overflow: ellipsis;
  color: var(--ink-faint); font-weight: 500; font-size: .8rem;
}
.progress { height: 3px; }
.progress > div {
  height: 100%; width: 0;
  background: linear-gradient(90deg, var(--accent), color-mix(in srgb, var(--accent) 60%, #facc15));
  transition: width .15s linear;
}

/* Language button + menu */
.lang-wrap { position: relative; flex: none; }
.lang-btn {
  height: 42px; padding: 0 12px;
  display: flex; align-items: center; gap: 6px;
  border-radius: 12px; border: 1px solid var(--line); background: var(--surface);
  font-weight: 600; font-size: .88rem;
  transition: border-color .2s;
}
.lang-btn:hover, .lang-btn[aria-expanded="true"] { border-color: var(--accent); }
.lang-btn svg { width: 17px; height: 17px; }
.lang-btn svg:last-child { width: 14px; height: 14px; opacity: .6; }
.lang-menu {
  position: absolute; right: 0; top: calc(100% + 8px);
  min-width: 180px; padding: 6px;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: 14px; box-shadow: var(--shadow);
  animation: pop .15s ease;
}
@keyframes pop { from { opacity: 0; transform: translateY(-4px); } }
.lang-item {
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 10px 12px; border: 0; border-radius: 10px; background: transparent;
  font-size: .95rem; text-align: left;
}
.lang-item:hover { background: var(--accent-soft); }
.lang-item svg { width: 16px; height: 16px; color: var(--accent); visibility: hidden; }
.lang-item.on { color: var(--accent); font-weight: 600; }
.lang-item.on svg { visibility: visible; }

/* ============ Page ============ */
.reader-main {
  max-width: var(--page-w);
  margin: 0 auto;
  padding: 28px 16px 64px;
}
.page {
  font-size: var(--read-size, 19px);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
  padding: clamp(32px, 6vw, 64px) clamp(22px, 7vw, 84px) clamp(28px, 5vw, 52px);
}

.chapter-head {
  text-align: center;
  padding-bottom: 1.4em;
  margin-bottom: 1.8em;
  border-bottom: 1px solid var(--line);
}
.chapter-num {
  display: inline-block;
  padding: .45em 1em;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-family: var(--font-ui); font-size: .68em; font-weight: 700;
  letter-spacing: .14em; text-transform: uppercase;
}
.chapter-head h2 {
  font-family: var(--font-display);
  font-size: 2.15em; line-height: 1.15; letter-spacing: -.015em;
  margin: .45em 0 .35em;
  text-wrap: balance;
}
.chapter-meta {
  font-family: var(--font-ui); font-size: .74em; color: var(--ink-faint);
  white-space: pre;
}

/* ============ Reading text ============ */
.reader {
  font-family: var(--font-read);
  line-height: 1.8;
}
.page.sans .reader { font-family: var(--font-ui); }
.reader p { margin: 0 0 1.15em; }
.reader .lead { font-size: 1.14em; color: var(--ink-soft); }
/* Drop cap on the first paragraph (Latin text only; it would split Devanagari letters) */
.reader:lang(en) > p:first-child::first-letter {
  float: left;
  font-family: var(--font-display);
  font-size: 3.5em; line-height: .85; font-weight: 700;
  padding: .08em .1em 0 0;
  color: var(--accent);
}
.reader h3 {
  font-family: var(--font-display); font-size: 1.32em;
  margin: 1.9em 0 .55em;
  display: flex; align-items: center; gap: .5em;
}
.reader h3::before {
  content: ""; width: .9em; height: 3px; border-radius: 3px; background: var(--accent); flex: none;
}
.reader ul, .reader ol { padding-left: 1.3em; margin: 0 0 1.4em; }
.reader li { margin-bottom: .5em; }
.reader li::marker { color: var(--accent); }
.reader strong { font-weight: 600; }
.reader blockquote {
  margin: 1.8em 0; padding: .9em 1.2em;
  border-left: 3px solid var(--accent);
  background: color-mix(in srgb, var(--accent-soft) 55%, transparent);
  border-radius: 0 12px 12px 0;
  font-style: italic; font-size: 1.08em; color: var(--ink-soft);
}
.reader .note {
  font-family: var(--font-ui); font-size: .8em; line-height: 1.65;
  background: var(--bg); border: 1px dashed var(--line);
  border-radius: 14px; padding: 14px 18px; margin: 1.6em 0; color: var(--ink-soft);
}
.reader .takeaway {
  position: relative;
  margin: 2.2em 0 .6em; padding: 1.1em 1.3em 1.1em 3.4em;
  background: var(--accent-soft);
  border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent);
  border-radius: 16px;
  font-family: var(--font-ui); font-size: .9em; line-height: 1.65;
}
.reader .takeaway::before {
  content: "💡"; position: absolute; left: 1em; top: 1em; font-size: 1.3em;
}
.reader .takeaway span {
  display: block; font-size: .74em; font-weight: 700; letter-spacing: .14em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 4px;
}
.reader .lessons { counter-reset: lesson; list-style: none; padding: 0; }
.reader .lessons li {
  counter-increment: lesson;
  position: relative; padding: .2em 0 .9em 2.6em; margin: 0;
}
.reader .lessons li::before {
  content: counter(lesson);
  position: absolute; left: 0; top: .15em;
  width: 1.8em; height: 1.8em; border-radius: 50%;
  display: grid; place-items: center;
  background: var(--accent-soft); color: var(--accent);
  font-family: var(--font-ui); font-size: .8em; font-weight: 700;
}
.reader .timeline { list-style: none; padding: 0; border-left: 2px solid var(--line); margin-left: 6px; }
.reader .timeline li { position: relative; padding: 0 0 1.2em 1.4em; margin: 0; }
.reader .timeline li::before {
  content: ""; position: absolute; left: -7px; top: .55em;
  width: 12px; height: 12px; border-radius: 50%; background: var(--accent);
  box-shadow: 0 0 0 4px var(--surface);
}
.reader .timeline b { display: block; font-family: var(--font-ui); font-size: .85em; color: var(--accent); }
.reader .sources a { word-break: break-word; }
.loading { text-align: center; color: var(--ink-faint); font-family: var(--font-ui); }

.chapter-end {
  margin-top: 2.6em;
  display: flex; flex-direction: column; align-items: center; gap: .3em;
  font-family: var(--font-ui); font-size: .72em; letter-spacing: .12em; text-transform: uppercase;
  color: var(--ink-faint);
}
.chapter-end span { color: var(--accent); font-size: 1.5em; letter-spacing: 0; }

/* Devanagari (Hindi, Marathi) needs a little more room between lines */
:lang(hi) .reader, :lang(mr) .reader { line-height: 1.95; }
:lang(hi) .chapter-head h2, :lang(mr) .chapter-head h2 { line-height: 1.4; letter-spacing: 0; }
:lang(hi) .chapter-num, :lang(mr) .chapter-num,
:lang(hi) .reader .takeaway span, :lang(mr) .reader .takeaway span { letter-spacing: .02em; }

/* ============ Previous / next ============ */
.chapter-nav {
  display: grid; grid-template-columns: 1fr 1fr; gap: 14px;
  margin-top: 20px;
}
.nav-card {
  display: flex; flex-direction: column; gap: 4px;
  padding: 16px 20px; min-height: 80px;
  border-radius: 18px; border: 1px solid var(--line); background: var(--surface);
  text-align: left; text-decoration: none; color: var(--ink);
  box-shadow: var(--shadow);
  transition: transform .2s, border-color .2s;
}
.nav-card:hover { transform: translateY(-2px); border-color: var(--accent); }
.nav-card.next, .nav-card.finish { text-align: right; align-items: flex-end; }
.nav-card small {
  display: flex; align-items: center; gap: 6px;
  color: var(--accent); font-size: .75rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase;
}
.nav-card small svg { width: 15px; height: 15px; }
.nav-card span { font-weight: 600; font-size: .95rem; }
.nav-card.finish { background: var(--accent-soft); border-color: color-mix(in srgb, var(--accent) 30%, transparent); }

/* ============ Drawers (contents + settings) ============ */
.scrim {
  position: fixed; inset: 0; z-index: 40; background: rgba(0, 0, 0, .4);
  opacity: 0; pointer-events: none; transition: opacity .2s;
}
.scrim.open { opacity: 1; pointer-events: auto; }
.drawer {
  position: fixed; z-index: 50; top: 0; bottom: 0; left: 0;
  width: min(370px, 88vw);
  background: var(--surface); border-right: 1px solid var(--line);
  transform: translateX(-100%); transition: transform .25s ease;
  display: flex; flex-direction: column;
}
.drawer.right { left: auto; right: 0; border-right: 0; border-left: 1px solid var(--line); transform: translateX(100%); }
.drawer.open { transform: none; }
.drawer header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px; border-bottom: 1px solid var(--line); font-weight: 700;
}
.drawer-body { overflow-y: auto; padding: 8px; }
.toc-item {
  display: flex; align-items: flex-start; gap: 12px; width: 100%; text-align: left;
  padding: 11px 12px; border: 0; border-radius: 12px; background: transparent;
  font-size: .93rem; line-height: 1.4;
}
.toc-item small { display: block; color: var(--ink-faint); font-size: .75rem; }
.toc-num {
  flex: none; width: 26px; height: 26px; border-radius: 50%;
  display: grid; place-items: center;
  background: var(--bg); color: var(--ink-faint); font-size: .75rem; font-weight: 700;
}
.toc-item:hover { background: var(--accent-soft); }
.toc-item.active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.toc-item.active .toc-num { background: var(--accent); color: #fff; }

.setting { padding: 12px 8px 16px; border-bottom: 1px solid var(--line); }
.setting:last-child { border-bottom: 0; }
.setting label {
  display: block; margin-bottom: 10px;
  font-size: .78rem; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-faint);
}
.seg { display: grid; grid-auto-flow: column; grid-auto-columns: 1fr; gap: 6px; }
.seg button {
  padding: 10px 6px; border-radius: 10px; border: 1px solid var(--line); background: var(--bg);
  font-size: .9rem;
}
.seg button.on { border-color: var(--accent); color: var(--accent); font-weight: 600; box-shadow: 0 0 0 1px var(--accent) inset; }
.swatch-light { background: #fff !important; color: #1c1917 !important; }
.swatch-sepia { background: #f4ecd8 !important; color: #3b2f22 !important; }
.swatch-dark { background: #1c1917 !important; color: #f5f5f4 !important; }
.swatch-light.on, .swatch-sepia.on { color: #c2410c !important; }
.swatch-dark.on { color: #fb923c !important; }

/* ============ Phones ============ */
@media (max-width: 640px) {
  .bar-inner { gap: 8px; padding: 8px 12px; }
  .icon-btn, .lang-btn { height: 40px; }
  .icon-btn { width: 40px; }
  .lang-btn { padding: 0 9px; }
  .lang-btn svg:last-child { display: none; }
  .reader-main { padding: 0 0 40px; }
  /* The page fills the screen on phones instead of floating as a card */
  .page {
    border: 0; border-radius: 0; box-shadow: none;
    padding: 28px 18px 24px;
  }
  .chapter-nav { padding: 0 12px; gap: 10px; }
  .nav-card { padding: 14px; }
  .nav-card span { font-size: .88rem; }
}