/* BharatBeej: warm paper and terracotta in light, deep indigo night in dark. */
:root {
  --bg: #faf6ef;
  --surface: #fffdf8;
  --surface-2: #f3ecdf;
  --ink: #2b2118;
  --ink-2: #5d4f42;
  --muted: #8a7a6a;
  --line: #e6dccb;
  --accent: #b4532a;
  --accent-ink: #ffffff;
  --accent-soft: #f6e2d4;
  --hl: #ffd66b;
  --hl-ink: #2b2118;
  --done: #4f8a5b;
  --shadow: 0 1px 2px rgba(60, 40, 20, .06), 0 6px 24px rgba(60, 40, 20, .07);
  --serif: "Noto Serif", Georgia, serif;
  --deva: "Noto Serif Devanagari", "Noto Serif", serif;
  --sans: "Inter", system-ui, -apple-system, sans-serif;
  --nav-w: 280px;
  --player-h: 92px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14131a; --surface: #1c1b24; --surface-2: #25232f; --ink: #ece6dc; --ink-2: #c4bbad; --muted: #8f8778;
    --line: #2f2c39; --accent: #e08a5c; --accent-ink: #1a120c; --accent-soft: #3a2a22; --hl: #e0a93c; --hl-ink: #1a120c;
    --done: #7cbf8a; --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 28px rgba(0,0,0,.35); color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #14131a; --surface: #1c1b24; --surface-2: #25232f; --ink: #ece6dc; --ink-2: #c4bbad; --muted: #8f8778;
  --line: #2f2c39; --accent: #e08a5c; --accent-ink: #1a120c; --accent-soft: #3a2a22; --hl: #e0a93c; --hl-ink: #1a120c;
  --done: #7cbf8a; --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 28px rgba(0,0,0,.35); color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 18px/1.7 var(--serif); }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
h1, h2, h3 { line-height: 1.25; font-weight: 600; }
[lang="sa"] { font-family: var(--deva); }
button { font: inherit; color: inherit; }
kbd { font: 12px var(--sans); padding: 1px 6px; border: 1px solid var(--line); border-radius: 4px; background: var(--surface); }

/* top bar */
.topbar { position: sticky; top: 0; z-index: 30; display: flex; align-items: center; gap: 10px; height: 56px;
  padding: 0 16px; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line); font-family: var(--sans); font-size: 15px; }
.brand { display: flex; align-items: center; gap: 8px; color: var(--ink); text-decoration: none; font-weight: 600; }
.brand-mark { display: grid; place-items: center; width: 30px; height: 30px; border-radius: 50%; background: var(--accent);
  color: var(--accent-ink); font: 600 17px/1 var(--deva); padding-top: 2px; }
.crumb-sep { color: var(--muted); }
.crumb { color: var(--ink-2); text-decoration: none; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.spacer { flex: 1; }
.icon-btn { width: 38px; height: 38px; border-radius: 10px; border: 1px solid var(--line); background: var(--surface);
  cursor: pointer; font-size: 17px; }
#nav-toggle { display: none; }

/* home */
.home-main { max-width: 1040px; margin: 0 auto; padding: 56px 16px 80px; }
.hero { text-align: center; max-width: 680px; margin: 0 auto 48px; }
.hero-deva { font: 600 22px var(--deva); color: var(--accent); margin: 0; }
.hero h1 { font-size: clamp(40px, 7vw, 64px); margin: 4px 0 10px; letter-spacing: -.01em; }
.hero-tag { font-size: 21px; color: var(--ink-2); margin: 0 0 14px; }
.hero-about { color: var(--muted); font-size: 17px; }
.topic-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 18px; }
.topic-card { display: flex; flex-direction: column; gap: 4px; padding: 24px; border-radius: 16px; background: var(--surface);
  border: 1px solid var(--line); box-shadow: var(--shadow); text-decoration: none; color: var(--ink); transition: transform .15s; }
.topic-card:hover { transform: translateY(-2px); }
.topic-card.soon { box-shadow: none; background: transparent; border-style: dashed; color: var(--muted); }
.topic-src { font: 500 13px var(--sans); text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
.topic-deva { font: 600 26px var(--deva); color: var(--accent); margin-top: 8px; }
.topic-title { font-size: 24px; font-weight: 600; }
.topic-sub { color: var(--ink-2); font-style: italic; }
.topic-blurb { color: var(--ink-2); font-size: 16px; margin-top: 8px; }
.topic-go { margin-top: auto; padding-top: 14px; font: 600 14px var(--sans); color: var(--accent); }
.soon .topic-go { color: var(--muted); font-weight: 500; }

/* course layout */
.course { display: grid; grid-template-columns: var(--nav-w) minmax(0, 1fr); min-height: calc(100vh - 56px); }
.sidenav { position: sticky; top: 56px; height: calc(100vh - 56px); overflow-y: auto; padding: 22px 14px 40px 18px;
  border-right: 1px solid var(--line); font-family: var(--sans); font-size: 14.5px; line-height: 1.4; }
.has-player .sidenav { height: calc(100vh - 56px - var(--player-h)); }
.side-topic { display: block; text-decoration: none; color: var(--ink); padding: 0 6px 12px; }
.side-deva { display: block; font: 600 19px var(--deva); color: var(--accent); }
.side-title { display: block; font-weight: 600; font-size: 17px; }
.side-src { display: block; color: var(--muted); font-size: 13px; }
.side-progress { height: 4px; margin: 4px 6px 18px; border-radius: 4px; background: var(--surface-2); overflow: hidden; }
.side-progress span { display: block; height: 100%; width: 0; background: var(--done); transition: width .3s; }
.side-chtitle { margin: 16px 6px 6px; font-weight: 600; font-size: 12.5px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
.sidenav ul { list-style: none; margin: 0; padding: 0; }
.sidenav li a { display: grid; grid-template-columns: 18px 1fr; column-gap: 8px; padding: 7px 8px; border-radius: 8px;
  color: var(--ink-2); text-decoration: none; }
.sidenav li a small { grid-column: 2; color: var(--muted); font-size: 12.5px; }
.sidenav li a:hover { background: var(--surface-2); }
.sidenav li a.current { background: var(--accent-soft); color: var(--ink); font-weight: 600; }
.tick { grid-row: span 2; width: 14px; height: 14px; margin-top: 2px; border-radius: 50%; border: 1.5px solid var(--line); }
a.visited .tick { background: var(--done); border-color: var(--done); box-shadow: inset 0 0 0 2.5px var(--surface); }
.content { width: 100%; max-width: 800px; padding: 36px 40px 60px; }
.has-player .content { padding-bottom: calc(var(--player-h) + 40px); }

.eyebrow { font: 500 13px var(--sans); text-transform: uppercase; letter-spacing: .07em; color: var(--muted); margin: 0 0 6px; }
.page-head h1, .page-hero h1 { font-size: clamp(30px, 5vw, 42px); margin: 0 0 10px; }
.h-deva { display: block; font: 600 .62em var(--deva); color: var(--accent); margin-bottom: 4px; }
.h-sub { display: block; font-size: .5em; font-weight: 400; font-style: italic; color: var(--ink-2); margin-top: 4px; }
.lede { font-size: 20px; color: var(--ink-2); margin: 0 0 16px; }
.muted { color: var(--muted); } .small { font-size: 15px; }
.hint { font: 14px var(--sans); color: var(--muted); margin-top: 28px; }

/* overview */
.opening { margin: 24px 0; padding: 20px 24px; border-left: 4px solid var(--accent); background: var(--surface); border-radius: 0 12px 12px 0; }
.opening p { margin: 0; }
.opening .deva { font-size: 24px; }
.opening .iast { font-style: italic; color: var(--ink-2); }
.opening .en { margin-top: 6px; }
.cta-row { display: flex; flex-wrap: wrap; gap: 10px; margin: 8px 0 18px; }
.btn { display: inline-block; padding: 11px 18px; border-radius: 999px; border: 1px solid var(--line); background: var(--surface);
  color: var(--ink); font: 600 15px var(--sans); text-decoration: none; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.prose h2 { font-size: 26px; margin: 40px 0 8px; }
.prose table { border-collapse: collapse; width: 100%; font-size: 16px; }
.prose td, .prose th { padding: 8px 10px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.prose .source { font-size: 15px; color: var(--muted); border-top: 1px solid var(--line); padding-top: 14px; margin-top: 32px; }
.takeaways h2, .course-map h2 { font-size: 26px; margin: 48px 0 16px; }
.take-grid { list-style: none; counter-reset: t; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px; }
.take-grid li { counter-increment: t; position: relative; padding: 18px 18px 16px; border-radius: 14px; background: var(--surface); border: 1px solid var(--line); }
.take-grid li::before { content: counter(t); position: absolute; top: 16px; right: 18px; font: 600 28px var(--serif); color: var(--accent-soft); }
.take-grid h3 { margin: 0 0 6px; font-size: 18px; padding-right: 30px; }
.take-grid p { margin: 0; font-size: 16px; color: var(--ink-2); line-height: 1.55; }
.map-chapter h3 { font: 600 13px var(--sans); text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin: 22px 0 8px; }
.map-pages { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 10px; }
.map-page { display: flex; flex-direction: column; gap: 2px; padding: 14px 16px; border-radius: 12px; border: 1px solid var(--line);
  background: var(--surface); text-decoration: none; color: var(--ink); }
.map-page:hover { border-color: var(--accent); }
.map-kind { font: 600 12px var(--sans); color: var(--accent); }
.map-title { font-weight: 600; }
.map-sub { font-size: 14.5px; color: var(--muted); line-height: 1.45; }

/* script switch */
.script-switch { display: inline-flex; border: 1px solid var(--line); border-radius: 999px; padding: 3px; background: var(--surface); font: 14px var(--sans); }
.script-switch button { border: 0; background: none; padding: 6px 14px; border-radius: 999px; cursor: pointer; color: var(--ink-2); }
.script-switch button[lang="sa"] { font-family: var(--deva); }
.script-switch button.on { background: var(--accent); color: var(--accent-ink); }
[data-script="deva"] .script-iast, [data-script="iast"] .script-deva { display: none; }

/* track blocks */
.block { margin: 34px 0; }
.block-label { font: 600 13px var(--sans); text-transform: uppercase; letter-spacing: .07em; color: var(--muted); margin: 0 0 12px; }
.block-label a { color: inherit; text-decoration: none; } .block-label a:hover { color: var(--accent); }
.block-label span { text-transform: none; letter-spacing: 0; font: italic 15px var(--serif); }
.verse-block { padding: 22px 24px; border-radius: 16px; background: var(--surface); border: 1px solid var(--line); }
.verse-text .vline { margin: 0; }
.script-deva { font-size: 25px; line-height: 1.9; }
.script-iast { font-size: 18.5px; font-style: italic; color: var(--ink-2); margin-top: 10px; }
[data-script="iast"] .script-iast { margin-top: 0; font-size: 21px; color: var(--ink); }
.big .script-deva { font-size: 29px; }
.danda { color: var(--muted); }
.spoken { margin: 14px 0 0; }
.spoken.translation { font-size: 19px; }
.spoken.interp { color: var(--ink-2); }
.prose-block .spoken { color: var(--ink); }
.verse-quote { font-style: italic; color: var(--muted); margin: 0 0 4px; }
.w, .dw { border-radius: 5px; transition: background-color .12s, color .12s; cursor: pointer; padding: 1px 0; }
.w:hover, .dw:hover { background: var(--surface-2); }
.w.on, .dw.on { background: var(--hl); color: var(--hl-ink); box-shadow: 0 0 0 3px var(--hl); }
.w.read { color: inherit; }
.sw:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* padapatha */
.padapatha { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 8px; }
.pp-break { grid-column: 1 / -1; height: 4px; }
.pp { display: flex; flex-direction: column; align-items: flex-start; gap: 1px; text-align: left; padding: 10px 12px;
  border: 1px solid var(--line); border-radius: 10px; background: var(--surface); cursor: pointer; transition: background .12s, border-color .12s; }
.pp:hover { border-color: var(--accent); }
.pp.on { background: var(--hl); border-color: var(--hl); color: var(--hl-ink); }
.pp-word { font-style: italic; font-weight: 600; font-size: 17px; }
.pp-parts { font: italic 14px var(--serif); color: var(--accent); }
.pp.on .pp-parts { color: var(--hl-ink); }
.pp-mean { font: 14px/1.4 var(--sans); color: var(--ink-2); }
.pp.on .pp-mean { color: var(--hl-ink); }

/* glossary */
.filter { width: 100%; max-width: 360px; padding: 10px 14px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--surface); color: var(--ink); font: 16px var(--sans); }
.glossary { display: grid; gap: 10px; margin: 24px 0; }
.g-item { padding: 14px 18px; border-radius: 12px; background: var(--surface); border: 1px solid var(--line); }
.g-item dt { display: flex; align-items: baseline; gap: 12px; }
.g-iast { font-style: italic; font-weight: 600; font-size: 20px; }
.g-deva { font-size: 20px; color: var(--accent); }
.g-item dd { margin: 4px 0 0; color: var(--ink-2); font-size: 17px; }

/* quiz */
.quiz { padding-left: 22px; }
.q { margin: 0 0 28px; }
.q-text { font-weight: 600; margin: 0 0 10px; }
.q-opts { display: grid; gap: 8px; }
.q-opt { text-align: left; padding: 10px 14px; border-radius: 10px; border: 1px solid var(--line); background: var(--surface); cursor: pointer; font-size: 17px; }
.q-opt:hover:not(:disabled) { border-color: var(--accent); }
.q-opt.right { background: color-mix(in srgb, var(--done) 18%, var(--surface)); border-color: var(--done); }
.q-opt.wrong { background: color-mix(in srgb, #c0392b 14%, var(--surface)); border-color: #c0392b; }
.q-opt:disabled { cursor: default; }
.q-why { margin: 10px 0 0; padding: 10px 14px; border-radius: 10px; background: var(--surface-2); font-size: 16px; }
.quiz-score { font: 600 18px var(--sans); padding: 16px 20px; border-radius: 12px; background: var(--accent-soft); }

/* pager */
.pager { display: flex; justify-content: space-between; gap: 12px; margin-top: 56px; padding-top: 22px; border-top: 1px solid var(--line); }
.pager a { display: flex; flex-direction: column; max-width: 48%; padding: 10px 14px; border-radius: 10px; border: 1px solid var(--line);
  text-decoration: none; color: var(--ink); font-weight: 600; background: var(--surface); }
.pager a.next { text-align: right; margin-left: auto; }
.pager small { font: 500 12px var(--sans); color: var(--muted); text-transform: uppercase; letter-spacing: .05em; }

/* player */
.player { position: fixed; left: 0; right: 0; bottom: 0; z-index: 40; padding: 10px 16px calc(10px + env(safe-area-inset-bottom));
  background: var(--surface); border-top: 1px solid var(--line); box-shadow: 0 -6px 24px rgba(0,0,0,.08); font-family: var(--sans); }
.player-row { display: flex; align-items: center; gap: 14px; max-width: 1100px; margin: 0 auto; }
.play { flex: none; width: 52px; height: 52px; border-radius: 50%; border: 0; background: var(--accent); cursor: pointer; display: grid; place-items: center; }
.play svg { width: 26px; height: 26px; fill: var(--accent-ink); }
.play .i-pause, .playing .play .i-play { display: none; }
.playing .play .i-pause { display: block; }
.bar-wrap { flex: 1; min-width: 0; }
.section-label { font-size: 13px; color: var(--ink-2); margin-bottom: 6px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.bar { position: relative; height: 8px; border-radius: 8px; background: var(--surface-2); cursor: pointer; touch-action: none; }
.bar-fill { position: absolute; inset: 0 auto 0 0; width: 0; border-radius: 8px; background: var(--accent); }
.tick-mark { position: absolute; top: -3px; width: 2px; height: 14px; background: var(--muted); opacity: .45; border-radius: 1px; }
.time { font-size: 13px; color: var(--muted); font-variant-numeric: tabular-nums; white-space: nowrap; }
.chip { flex: none; padding: 6px 11px; border-radius: 999px; border: 1px solid var(--line); background: var(--bg); cursor: pointer; font-size: 13px; font-weight: 600; color: var(--ink-2); }
.chip.on { background: var(--accent-soft); border-color: var(--accent); color: var(--ink); }
.now { display: flex; gap: 10px; align-items: baseline; justify-content: center; max-width: 1100px; margin: 0 auto 6px; font-size: 15px; }
.now-word { font: italic 600 17px var(--serif); color: var(--accent); }
.now-meaning { color: var(--ink-2); }

/* mobile */
@media (max-width: 900px) {
  .course { grid-template-columns: 1fr; }
  #nav-toggle { display: grid; place-items: center; }
  .sidenav { position: fixed; top: 56px; left: 0; z-index: 35; width: min(320px, 86vw); background: var(--bg);
    transform: translateX(-102%); transition: transform .2s; box-shadow: var(--shadow); }
  .nav-open .sidenav { transform: none; }
  .content { padding: 26px 16px 48px; }
  .verse-block { padding: 18px 16px; }
  .script-deva { font-size: 22px; } .big .script-deva { font-size: 24px; }
  .time { display: none; }
  .player-row { gap: 10px; }
  .play { width: 46px; height: 46px; }
}
@media (max-width: 420px) { #follow { display: none; } body { font-size: 17px; } }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; scroll-behavior: auto !important; } }