/* ===========================================================
   BAMA Learn Burmese — stylesheet v2
   White ground, compact spacing, lacquerware accent palette.
   =========================================================== */

@import url('https://fonts.googleapis.com/css2?family=Spectral:ital,wght@0,500;0,600;0,700;1,500&family=Work+Sans:wght@400;500;600&family=IBM+Plex+Mono:wght@500&display=swap');

/* Self-hosted — the script that actually matters shouldn't depend on a CDN */
@font-face {
  font-family: 'Noto Sans Myanmar';
  src: url('../fonts/NotoSansMyanmar-Regular.ttf') format('truetype');
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: 'Noto Sans Myanmar';
  src: url('../fonts/NotoSansMyanmar-Bold.ttf') format('truetype');
  font-weight: 700;
  font-display: swap;
}

:root {
  --ink: #221b16;
  --paper: #f4efe1;
  --paper-2: #eae1c8;
  --jade: #1f5d42;
  --jade-deep: #163f2d;
  --gold: #ab7f28;
  --umber: #7a4a23;
  --muted: #5c5240;
  --line: #ddd2ac;
  --max: 40rem;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: 'Work Sans', system-ui, sans-serif;
  font-size: 18px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.mm { font-family: 'Noto Sans Myanmar', 'Padauk', sans-serif; }

h1, h2, h3 {
  font-family: 'Spectral', Georgia, serif;
  font-weight: 600;
  line-height: 1.25;
  margin: 0 0 0.5em;
  color: #039191;
}
h1 { font-size: 2.1rem; }
h2 { font-size: 1.4rem; margin-top: 2.2em; }
h3 { font-size: 1.12rem; margin-top: 1.4em; }
p { margin: 0 0 1.05em; }

a { color: var(--jade); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--umber); }

.eyebrow {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--gold);
  display: block;
  margin-bottom: 0.4em;
}

blockquote {
  font-family: 'Spectral', serif;
  font-style: italic;
  font-size: 1.05rem;
  color: var(--muted);
  border-left: 2px solid var(--gold);
  margin: 0;
  padding-left: 1.1em;
  line-height: 1.5;
}
blockquote cite {
  display: block;
  font-style: normal;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-top: 0.7em;
}

/* ---------- header / nav ---------- */
header.site {
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  background: var(--paper);
  z-index: 20;
}
.nav-wrap {
  max-width: 54rem;
  margin: 0 auto;
  padding: 0.7rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand { display: flex; align-items: center; gap: 0.55rem; text-decoration: none; color: var(--ink); }
.brand:hover { color: var(--ink); }
.mark {
  width: 30px; height: 30px;
  flex: none;
  border: 1px solid var(--line);
  background: var(--paper-2);
  display: flex; align-items: center; justify-content: center;
  font-family: 'Noto Sans Myanmar', 'Padauk', sans-serif;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--jade);
}
.wordmark { font-family: 'Spectral', serif; font-weight: 700; font-size: 1.05rem; letter-spacing: 0.01em; }

nav.primary ul { list-style: none; display: flex; gap: 1.5rem; margin: 0; padding: 0; font-size: 0.86rem; }
nav.primary a { color: var(--ink); text-decoration: none; font-weight: 500; letter-spacing: 0.02em; }
nav.primary a:hover, nav.primary a.active { color: var(--jade); }

#nav-toggle { display: none; }
.nav-btn { display: none; }
@media (max-width: 680px) {
  .nav-btn {
    display: block; background: none; border: 1px solid var(--line); border-radius: 4px;
    padding: 0.3rem 0.55rem; font-family: 'IBM Plex Mono', monospace; font-size: 0.72rem;
    color: var(--ink); cursor: pointer;
  }
  nav.primary { display: none; width: 100%; order: 3; }
  nav.primary ul { flex-direction: column; gap: 0; }
  nav.primary a { display: block; padding: 0.6rem 0; border-bottom: 1px solid var(--line); }
  #nav-toggle:checked ~ nav.primary { display: block; }
  .nav-wrap { flex-wrap: wrap; }
}

/* ---------- main ---------- */
main { max-width: var(--max); margin: 0 auto; padding: 3rem 1.6rem 5rem; }

/* ---------- home hero ---------- */
.hero { max-width: 40rem; margin: 0 auto; padding: 3.2rem 1.5rem 1rem; text-align: center; }
.hero .mark-lg {
  width: 56px; height: 56px; margin: 0 auto 1.4rem;
  border: 1px solid var(--line); background: var(--paper-2);
  display: flex; align-items: center; justify-content: center;
  font-family: 'Noto Sans Myanmar', 'Padauk', sans-serif; font-weight: 700; font-size: 2rem; color: var(--jade);
}
.hero h1 { font-size: 2rem; max-width: 22ch; margin: 0 auto 0.6rem; }
.hero .lede { font-size: 1.02rem; color: var(--muted); max-width: 40ch; margin: 0 auto 1.6rem; }
.hero .cta-row { display: flex; gap: 0.7rem; justify-content: center; flex-wrap: wrap; }

.btn {
  display: inline-block; font-family: 'IBM Plex Mono', monospace; font-size: 0.8rem; letter-spacing: 0.03em;
  text-decoration: none; color: var(--paper); background: var(--jade);
  padding: 0.65rem 1.2rem; border: 1px solid var(--jade); transition: background 0.15s, color 0.15s;
}
.btn:hover { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn.ghost:hover { border-color: var(--jade); color: var(--jade); background: transparent; }
.btn.small { padding: 0.4rem 0.8rem; font-size: 0.72rem; }

/* ---------- compact resource lists ---------- */
.res-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 2.2rem; }
@media (max-width: 560px) { .res-grid { grid-template-columns: 1fr; } }
.res-col h2 { margin-top: 1.4rem; padding-top: 1.1rem; font-size: 1rem; border-top: 1px solid var(--line); }
.res-col h2:first-child { margin-top: 0; padding-top: 0; border-top: none; }
ul.tight { list-style: none; margin: 0 0 0.2rem; padding: 0; font-size: 0.87rem; line-height: 1.5; }
ul.tight li { padding: 0.18rem 0; }
ul.tight .d { color: var(--muted); font-size: 0.8rem; }

/* ---------- book / lessons shelf ---------- */
.book-card {
  display: flex; gap: 1.1rem; border: 1px solid var(--line); padding: 1.1rem;
  text-decoration: none; color: var(--ink); align-items: center;
}
.book-card:hover { border-color: var(--jade); }
.book-card .spine {
  flex: none; width: 44px; height: 60px; background: var(--jade); color: var(--paper);
  display: flex; align-items: center; justify-content: center;
  font-family: 'IBM Plex Mono', monospace; font-size: 0.78rem; font-weight: 600;
}
.book-card h3 { margin: 0 0 0.2rem; }
.book-card p { margin: 0; color: var(--muted); font-size: 0.85rem; }
.book-card .tag {
  font-family: 'IBM Plex Mono', monospace; font-size: 0.65rem; color: var(--umber);
  border: 1px solid var(--line); padding: 0.1rem 0.4rem; margin-left: auto; white-space: nowrap; align-self: flex-start;
}
.shelf { display: flex; flex-direction: column; gap: 0.8rem; margin: 1.4rem 0; }

/* ---------- downloads ---------- */
.download-row { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 0.8rem 0; border-bottom: 1px solid var(--line); }
.download-row:last-child { border-bottom: none; }
.download-row .meta { font-size: 0.82rem; color: var(--muted); }
.download-row .name { font-weight: 600; }
.download-row .dl {
  font-family: 'IBM Plex Mono', monospace; font-size: 0.75rem; color: var(--jade); text-decoration: none;
  border: 1px solid var(--line); padding: 0.35rem 0.7rem; white-space: nowrap;
}
.download-row .dl:hover { border-color: var(--jade); }
.note-box {
  background: var(--paper-2); border: 1px solid var(--line); padding: 1rem 1.1rem; font-size: 0.88rem;
  color: var(--muted); margin: 1.3rem 0;
}
.note-box strong { color: var(--ink); }

/* ---------- footer ---------- */
footer.site { border-top: 1px solid var(--line); margin-top: 3rem; }
.footer-wrap { max-width: 54rem; margin: 0 auto; padding: 1.8rem 1.5rem; display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; justify-content: space-between; }
.footer-copy { font-size: 0.78rem; color: var(--muted); }
.social-row { display: flex; gap: 0.75rem; }
.social-row a { display: flex; align-items: center; justify-content: center; width: 30px; height: 30px; border: 1px solid var(--line); border-radius: 50%; color: var(--ink); }
.social-row a:hover { border-color: var(--jade); color: var(--jade); }
.social-row svg { width: 14px; height: 14px; }


/* ================= BOOK 1 PAGE — formal training-course layout ================= */

.book-header { max-width: 44rem; margin: 0 auto; padding: 3.6rem 1.6rem 1.4rem; }
.book-header .eyebrow { margin-bottom: 0.6rem; }
.book-header h1 { font-size: 2.1rem; }
.book-header .lede { font-size: 1rem; color: var(--muted); max-width: 46rem; }

.goal-box {
  background: var(--paper-2); border: 1px solid var(--line); border-left: 3px solid var(--umber);
  padding: 1rem 1.2rem; margin: 1.4rem 0; font-size: 0.92rem;
}
.goal-box strong { color: var(--umber); font-family: 'IBM Plex Mono', monospace; font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase; display: block; margin-bottom: 0.4rem; }

.progress-bar { height: 5px; background: var(--line); margin: 1.4rem 0 0.5rem; position: relative; }
.progress-bar > span { display: block; height: 100%; background: var(--jade); width: 0%; transition: width 0.3s; }
.progress-label { font-family: 'IBM Plex Mono', monospace; font-size: 0.72rem; color: var(--muted); }
.resume-row { margin-top: 1.1rem; display: flex; gap: 0.6rem; flex-wrap: wrap; }

.romanization-note {
  font-size: 0.8rem; color: var(--muted); border-top: 1px solid var(--line); margin-top: 1.6rem; padding-top: 1rem;
}
.romanization-note strong { color: var(--ink); }

/* ---- Table of contents, grouped by Part ---- */
.toc-wrap { max-width: 48rem; margin: 1.8rem auto 3.5rem; padding: 0 1.5rem; }
.part-label {
  font-family: 'IBM Plex Mono', monospace; font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--jade); margin: 2rem 0 0.7rem; padding-top: 1.2rem; border-top: 1px solid var(--line);
}
.part-label:first-child { margin-top: 0; padding-top: 0; border-top: none; }
.toc-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.6rem; }
@media (max-width: 700px) { .toc-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 460px) { .toc-grid { grid-template-columns: 1fr; } }
.toc-item {
  display: flex; align-items: center; gap: 0.55rem; border: 1px solid var(--line); padding: 0.6rem 0.7rem;
  text-decoration: none; color: var(--ink); font-size: 0.83rem; position: relative;
}
.toc-item:hover { border-color: var(--jade); }
.toc-item .tn { font-family: 'IBM Plex Mono', monospace; color: var(--muted); font-size: 0.7rem; flex: none; width: 1.4rem; }
.toc-item .tl { font-family: 'Noto Sans Myanmar', 'Padauk', sans-serif; color: var(--jade); flex: none; }
.toc-item .tt { flex: 1; line-height: 1.25; }
.toc-item .check { flex: none; width: 15px; height: 15px; border: 1px solid var(--line); border-radius: 50%; }
.toc-item.is-read .check { background: var(--umber); border-color: var(--umber); }
.toc-item.is-read { background: var(--paper-2); }

/* ---- Unit shell ---- */
.unit { max-width: 44rem; margin: 0 auto; padding: 4.6rem 1.6rem; border-top: 1px solid var(--line); }
.unit:first-of-type { border-top: none; }
.unit-part { font-family: 'IBM Plex Mono', monospace; font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--jade); margin-bottom: 0.5rem; display: block; }
.unit-head { display: flex; align-items: baseline; gap: 0.9rem; margin-bottom: 0.3rem; }
.unit-num { font-family: 'IBM Plex Mono', monospace; color: var(--gold); font-size: 0.84rem; }
.unit-letter { font-family: 'Noto Sans Myanmar', 'Padauk', sans-serif; font-size: 1.8rem; color: var(--jade); }
.unit-letter.multi { font-size: 1.05rem; letter-spacing: 0.12em; }
.unit h2 { margin: 0.15rem 0 0.15rem; font-size: 1.55rem; }
.unit .unit-sub { color: var(--muted); font-size: 0.86rem; margin-bottom: 1rem; }
.unit .goal-box { margin-top: 0; margin-bottom: 2.2rem; }

/* ---- Section blocks, each visually distinct ---- */
.section-block { margin-bottom: 3.2rem; }
.section-head {
  display: flex; align-items: baseline; gap: 0.6rem; margin-bottom: 1rem;
  border-bottom: 2px solid var(--ink); padding-bottom: 0.5rem;
}
.section-head .sn { font-family: 'IBM Plex Mono', monospace; font-size: 0.72rem; color: var(--gold); }
.section-head h3 { margin: 0; font-size: 1.05rem; }

/* Main dialogue / reading — the "one phone screen" block */
.main-block { background: var(--paper-2); border: 1px solid var(--line); padding: 1.7rem 1.7rem 1.3rem; border-radius: 2px; }
.narration { font-family: 'Spectral', serif; font-style: italic; font-size: 0.95rem; color: var(--muted); margin: 0 0 1.1rem; padding-bottom: 1rem; border-bottom: 1px solid var(--line); }
.dlg-line { display: flex; gap: 0.8rem; padding: 0.75rem 0; border-bottom: 1px dotted var(--line); align-items: flex-start; }
.dlg-line:last-child { border-bottom: none; }
.dlg-speaker {
  flex: none; width: 1.6rem; height: 1.6rem; border-radius: 50%; background: var(--ink); color: var(--paper);
  font-family: 'IBM Plex Mono', monospace; font-size: 0.7rem; display: flex; align-items: center; justify-content: center;
}
.dlg-body .mm { font-size: 1.22rem; display: block; line-height: 1.5; }
.dlg-body .rom { color: var(--umber); font-family: 'IBM Plex Mono', monospace; font-size: 0.85rem; display: block; margin-top: 0.25rem; }
.dlg-body .eng { color: var(--muted); font-size: 0.92rem; display: block; margin-top: 0.2rem; }

.listen-box {
  border: 1px dashed var(--line); padding: 0.65rem 0.9rem; font-size: 0.8rem; color: var(--muted);
  margin-top: 1rem; display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.listen-box audio { width: 100%; }
.listen-box.pending { font-family: 'IBM Plex Mono', monospace; font-size: 0.72rem; }

/* Vocab */
.vocab-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.5rem 1.4rem; }
@media (max-width: 480px) { .vocab-grid { grid-template-columns: 1fr; } }
.vocab-item { font-size: 0.9rem; padding: 0.4rem 0; border-bottom: 1px dotted var(--line); }
.vocab-item .mm { font-size: 1.08rem; }
.vocab-item .rom { color: var(--umber); font-family: 'IBM Plex Mono', monospace; font-size: 0.76rem; }
.vocab-item .eng { color: var(--muted); display: block; font-size: 0.83rem; }
.quizlet-hint { margin-top: 1rem; font-size: 0.78rem; color: var(--muted); font-style: italic; }

.culture-box {
  font-size: 0.96rem; line-height: 1.7; background: var(--paper-2); border: 1px solid var(--line);
  border-left: 3px solid var(--jade); padding: 1.2rem 1.3rem; color: var(--ink);
}

/* Grammar — multi-point, cumulative */
.grammar-point { border: 1px solid var(--line); padding: 1.1rem 1.2rem; margin-bottom: 1rem; }
.grammar-point:last-child { margin-bottom: 0; }
.grammar-point h4 { margin: 0 0 0.5rem; font-family: 'Spectral', serif; font-size: 1rem; color: var(--jade); }
.grammar-point p { font-size: 0.9rem; margin-bottom: 0.7rem; color: var(--ink); }
.grammar-examples { border-top: 1px dotted var(--line); padding-top: 0.6rem; }
.g-ex { display: flex; flex-wrap: wrap; gap: 0.3rem 0.6rem; align-items: baseline; font-size: 0.85rem; padding: 0.25rem 0; }
.g-ex .mm { font-size: 1rem; }
.g-ex .rom { color: var(--umber); font-family: 'IBM Plex Mono', monospace; font-size: 0.75rem; }
.g-ex .eng { color: var(--muted); margin-left: auto; }

/* Writing — four-line Myanmar guide, red/blue rule lines */
.write-guide { display: flex; gap: 1.6rem; align-items: flex-start; flex-wrap: wrap; }
.guide-box { flex: none; width: 150px; }
.guide-lines { position: relative; height: 150px; }
.guide-lines .rl { position: absolute; left: 0; right: 0; height: 2px; background: #b5433a; }
.guide-lines .rl.top { top: 6px; }
.guide-lines .rl.bottom { bottom: 6px; }
.guide-lines .bl { position: absolute; left: 0; right: 0; height: 1px; background: #3a6ea5; }
.guide-lines .bl.top { top: 42px; }
.guide-lines .bl.bottom { bottom: 42px; }
.guide-letter {
  position: absolute; left: 0; right: 0; top: 42px; bottom: 42px;
  display: flex; align-items: center; justify-content: center;
  font-family: 'Noto Sans Myanmar', 'Padauk', sans-serif; font-size: 3.6rem; color: var(--ink); line-height: 1;
}
.guide-arrow { display: none; }

.practice-sheet-link {
  display: flex; align-items: center; gap: 0.9rem; margin-top: 1rem; padding: 0.8rem 1rem;
  background: var(--paper-2); border: 1px solid var(--line); text-decoration: none; color: var(--ink);
}
.practice-sheet-link:hover { border-color: var(--jade); }
.practice-sheet-link img { width: 46px; height: 62px; object-fit: cover; object-position: top; border: 1px solid var(--line); flex: none; background: #fff; }
.practice-sheet-link .psl-text { font-size: 0.84rem; }
.practice-sheet-link .psl-text strong { display: block; color: var(--jade); font-size: 0.88rem; }
.write-desc { flex: 1; min-width: 200px; }
.write-desc p { font-size: 0.92rem; color: var(--ink); margin: 0 0 0.7rem; }
.write-desc .write-hint { font-size: 0.78rem; color: var(--muted); font-style: italic; }

.mark-read-row { display: flex; align-items: center; gap: 0.9rem; margin-top: 2.6rem; padding-top: 1.6rem; border-top: 1px solid var(--line); flex-wrap: wrap; }
.mark-read {
  font-family: 'IBM Plex Mono', monospace; font-size: 0.76rem; letter-spacing: 0.02em;
  border: 1px solid var(--umber); color: var(--umber); background: none; padding: 0.55rem 1.1rem; cursor: pointer;
}
.mark-read.is-done { background: var(--umber); color: var(--paper); }
.next-unit { font-size: 0.83rem; color: var(--muted); }
.next-unit a { color: var(--jade); }

/* ---- Back-to-top floating button ---- */
.back-to-top {
  position: fixed; bottom: 1.4rem; right: 1.4rem; width: 42px; height: 42px; border-radius: 50%;
  background: var(--ink); color: var(--paper); border: none; display: flex; align-items: center; justify-content: center;
  cursor: pointer; opacity: 0; pointer-events: none; transition: opacity 0.2s, transform 0.2s; z-index: 30;
  box-shadow: 0 4px 14px rgba(34,27,22,0.22);
}
.back-to-top.is-visible { opacity: 1; pointer-events: auto; }
.back-to-top:hover { background: var(--jade); transform: translateY(-2px); }
.back-to-top svg { width: 18px; height: 18px; }