/* Vocabulary study player. Scoped under .bv-vocab, uses site tokens from styles.css. */
.bv-vocab { padding-block: clamp(1.5rem, 4vw, 3rem); }
.bv-vocab-crumbs { display: flex; flex-wrap: wrap; align-items: center; gap: .4rem; font-size: .85rem; color: var(--muted, rgba(15,23,42,.6)); margin-bottom: .85rem; }
.bv-vocab-crumbs a { color: var(--muted, rgba(15,23,42,.62)); text-decoration: none; }
.bv-vocab-crumbs a:hover { color: var(--brand, #2f6fed); text-decoration: underline; }
.bv-vocab-crumbs span { opacity: .5; }
.bv-vocab-crumbs__here { opacity: 1; color: var(--ink, #0f172a); font-weight: 600; }

.bv-vocab-back {
  display: inline-flex; align-items: center; gap: .4rem; margin-bottom: 1rem;
  font-size: .88rem; font-weight: 600; text-decoration: none;
  color: var(--brand, #2f6fed);
  border: 1px solid var(--border, rgba(15,23,42,.12)); border-radius: 999px; padding: .4rem .9rem;
  background: var(--soft, rgba(15,23,42,.04)); transition: background .15s ease, border-color .15s ease;
}
.bv-vocab-back:hover { background: rgba(47,111,237,.1); border-color: rgba(47,111,237,.4); }
.bv-vocab-back i { transition: transform .15s ease; }
.bv-vocab-back:hover i { transform: translateX(-2px); }

/* compact unit index (term archive) */
.bv-vocab-index { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: .5rem; max-width: 760px; }
.bv-vocab-index__item { margin: 0; }
.bv-vocab-index__link {
  display: flex; align-items: center; gap: .9rem; text-decoration: none;
  background: #fff; border: 1px solid var(--border, rgba(15,23,42,.1)); border-radius: 12px;
  padding: .7rem .9rem; transition: border-color .15s ease, box-shadow .15s ease, transform .15s ease;
}
.bv-vocab-index__link:hover { border-color: rgba(47,111,237,.45); box-shadow: var(--shadow, 0 8px 22px rgba(15,23,42,.08)); transform: translateX(2px); }
.bv-vocab-index__no {
  flex-shrink: 0; width: 34px; height: 34px; border-radius: 9px;
  display: inline-flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: .9rem; color: var(--brand, #2f6fed);
  background: rgba(47,111,237,.1);
}
.bv-vocab-index__body { flex: 1 1 auto; min-width: 0; display: flex; flex-direction: column; gap: .1rem; }
.bv-vocab-index__title { font-weight: 600; color: var(--ink, #0f172a); line-height: 1.35; }
.bv-vocab-index__meta { font-size: .8rem; color: var(--muted, rgba(15,23,42,.58)); }
.bv-vocab-index__meta i { color: #0a7d72; }
.bv-vocab-index__arrow { flex-shrink: 0; color: var(--muted, rgba(15,23,42,.4)); font-size: 1rem; transition: transform .15s ease, color .15s ease; }
.bv-vocab-index__link:hover .bv-vocab-index__arrow { color: var(--brand, #2f6fed); transform: translateX(3px); }

.bv-vocab-head { margin-bottom: 1.25rem; }
.bv-vocab-title { font-size: clamp(1.4rem, 3vw, 2rem); font-weight: 800; margin: 0 0 .35rem; }

.bv-vocab-toolbar { display: flex; flex-wrap: wrap; gap: .75rem; align-items: center; justify-content: space-between; margin-bottom: 1rem; }
.bv-vocab-views { display: inline-flex; gap: .25rem; background: var(--soft, rgba(15,23,42,.05)); padding: .25rem; border-radius: 999px; }
.bv-vocab-view {
  border: 0; background: transparent; cursor: pointer;
  font-size: .88rem; font-weight: 600; color: var(--muted, rgba(15,23,42,.62));
  padding: .45rem .9rem; border-radius: 999px; display: inline-flex; align-items: center; gap: .35rem;
  transition: background .15s ease, color .15s ease;
}
.bv-vocab-view.is-active { background: #fff; color: var(--brand, #2f6fed); box-shadow: 0 1px 3px rgba(15,23,42,.1); }
.bv-vocab-progress { font-size: .88rem; font-weight: 600; color: var(--muted, rgba(15,23,42,.6)); white-space: nowrap; }
.bv-vocab-progress i { color: #0a7d72; }

/* filters */
.bv-vocab-filters { display: flex; flex-wrap: wrap; gap: .6rem; align-items: center; margin-bottom: 1rem; }
.bv-vocab-search { position: relative; flex: 1 1 220px; }
.bv-vocab-search i { position: absolute; left: .75rem; top: 50%; transform: translateY(-50%); color: var(--muted, rgba(15,23,42,.5)); }
.bv-vocab-search input { width: 100%; padding: .55rem .8rem .55rem 2.1rem; border-radius: 10px; border: 1px solid var(--border, rgba(15,23,42,.14)); }
.bv-vocab-select { padding: .55rem .8rem; border-radius: 10px; border: 1px solid var(--border, rgba(15,23,42,.14)); background: #fff; }
.bv-vocab-hidelearned { font-size: .85rem; color: var(--muted, rgba(15,23,42,.62)); display: inline-flex; align-items: center; gap: .35rem; cursor: pointer; }

/* word list */
.bv-vocab-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: .75rem; }
.bv-vword {
  display: flex; justify-content: space-between; gap: .75rem;
  background: #fff; border: 1px solid var(--border, rgba(15,23,42,.1)); border-radius: 14px; padding: .8rem .9rem;
  transition: border-color .15s ease, box-shadow .15s ease;
}
.bv-vword:hover { box-shadow: var(--shadow, 0 10px 26px rgba(15,23,42,.08)); }
.bv-vword.is-learned { border-color: rgba(0,184,169,.5); background: rgba(0,184,169,.04); }
.bv-vword__main { min-width: 0; }
.bv-vword__top { display: flex; flex-wrap: wrap; align-items: baseline; gap: .4rem; }
.bv-vword__word { font-size: 1.05rem; font-weight: 700; color: var(--ink, #0f172a); }
.bv-vword__cefr { font-size: .66rem; font-weight: 700; padding: .1rem .4rem; border-radius: 999px; background: rgba(47,111,237,.12); color: #2f6fed; }
.bv-vword__pos { font-size: .78rem; color: var(--muted, rgba(15,23,42,.55)); font-style: italic; }
.bv-vword__ipa { font-size: .82rem; color: var(--muted, rgba(15,23,42,.6)); }
.bv-vword__meaning { font-weight: 600; margin-top: .2rem; }
.bv-vword__ex { font-size: .85rem; color: var(--muted, rgba(15,23,42,.7)); margin-top: .25rem; }
.bv-vword__exvi { color: var(--muted, rgba(15,23,42,.5)); }
.bv-vword__actions { display: flex; flex-direction: column; gap: .35rem; align-items: flex-end; flex-shrink: 0; }
.bv-vword__speak { width: 34px; height: 34px; border-radius: 50%; border: 1px solid var(--border, rgba(15,23,42,.12)); background: var(--soft, rgba(15,23,42,.04)); color: var(--brand, #2f6fed); cursor: pointer; }
.bv-vword__speak:hover { background: rgba(47,111,237,.12); }
.bv-vword__learn { font-size: .76rem; font-weight: 600; border: 1px solid var(--border, rgba(15,23,42,.12)); background: #fff; color: var(--muted, rgba(15,23,42,.6)); border-radius: 999px; padding: .28rem .6rem; cursor: pointer; white-space: nowrap; }
.bv-vword.is-learned .bv-vword__learn { background: #0a7d72; color: #fff; border-color: transparent; }
.bv-vocab-empty { text-align: center; color: var(--muted, rgba(15,23,42,.6)); padding: 2rem; }

/* flashcard */
.bv-flash { max-width: 520px; margin: 0 auto; }
.bv-flash__card { position: relative; perspective: 1200px; min-height: 260px; cursor: pointer; }
.bv-flash__face {
  position: absolute; inset: 0; backface-visibility: hidden; border-radius: 18px;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: .5rem; text-align: center; padding: 1.5rem;
  border: 1px solid var(--border, rgba(15,23,42,.1)); background: #fff; box-shadow: var(--shadow, 0 14px 32px rgba(15,23,42,.1));
  transition: transform .5s; transform-style: preserve-3d;
}
.bv-flash__front { transform: rotateY(0deg); }
.bv-flash__back { transform: rotateY(180deg); background: linear-gradient(135deg, rgba(47,111,237,.06), rgba(0,184,169,.06)); }
.bv-flash__card.is-flipped .bv-flash__front { transform: rotateY(-180deg); }
.bv-flash__card.is-flipped .bv-flash__back { transform: rotateY(0deg); }
.bv-flash__word { font-size: 2rem; font-weight: 800; }
.bv-flash__ipa { color: var(--muted, rgba(15,23,42,.6)); }
.bv-flash__cefr { font-size: .7rem; font-weight: 700; padding: .12rem .5rem; border-radius: 999px; background: rgba(47,111,237,.12); color: #2f6fed; }
.bv-flash__hint { position: absolute; bottom: .8rem; font-size: .72rem; color: var(--muted, rgba(15,23,42,.45)); }
.bv-flash__pos { font-style: italic; color: var(--muted, rgba(15,23,42,.6)); }
.bv-flash__meaning { font-size: 1.5rem; font-weight: 700; }
.bv-flash__ex { font-size: .95rem; color: var(--muted, rgba(15,23,42,.75)); }
.bv-flash__exvi { font-size: .88rem; color: var(--muted, rgba(15,23,42,.55)); }
.bv-flash__speak, .bv-flash__speakex { width: 36px; height: 36px; border-radius: 50%; border: 1px solid var(--border, rgba(15,23,42,.12)); background: var(--soft, rgba(15,23,42,.04)); color: var(--brand, #2f6fed); cursor: pointer; margin-left: .4rem; }
.bv-flash__controls { display: flex; align-items: center; justify-content: center; gap: .5rem; margin-top: 1.1rem; }
.bv-flash__nav, .bv-flash__shuffle { width: 44px; height: 44px; border-radius: 12px; border: 1px solid var(--border, rgba(15,23,42,.12)); background: #fff; cursor: pointer; font-size: 1.1rem; }
.bv-flash__nav:hover, .bv-flash__shuffle:hover { background: var(--soft, rgba(15,23,42,.05)); }
.bv-flash__learn { border: 1px solid var(--border, rgba(15,23,42,.12)); background: #fff; color: var(--muted, rgba(15,23,42,.65)); border-radius: 12px; padding: .6rem 1rem; font-weight: 600; cursor: pointer; }
.bv-flash__learn.is-on { background: #0a7d72; color: #fff; border-color: transparent; }
.bv-flash__counter { text-align: center; margin-top: .75rem; color: var(--muted, rgba(15,23,42,.6)); font-weight: 600; }

/* quiz */
.bv-quiz { max-width: 560px; margin: 0 auto; }
.bv-quiz__bar { height: 6px; border-radius: 999px; background: var(--soft, rgba(15,23,42,.08)); overflow: hidden; margin-bottom: 1rem; }
.bv-quiz__bar span { display: block; height: 100%; background: linear-gradient(90deg, var(--brand, #2f6fed), var(--brand2, #00b8a9)); transition: width .3s ease; }
.bv-quiz__head { display: flex; justify-content: space-between; font-size: .85rem; color: var(--muted, rgba(15,23,42,.6)); font-weight: 600; margin-bottom: .75rem; }
.bv-quiz__word { font-size: 1.9rem; font-weight: 800; text-align: center; }
.bv-quiz__word small { font-size: 1rem; font-weight: 500; color: var(--muted, rgba(15,23,42,.6)); }
.bv-quiz__speak { width: 34px; height: 34px; border-radius: 50%; border: 1px solid var(--border, rgba(15,23,42,.12)); background: var(--soft, rgba(15,23,42,.04)); color: var(--brand, #2f6fed); cursor: pointer; vertical-align: middle; }
.bv-quiz__prompt { text-align: center; color: var(--muted, rgba(15,23,42,.6)); margin: .5rem 0 1.25rem; }
.bv-quiz__opts { display: grid; gap: .6rem; }
.bv-quiz__opt { text-align: left; padding: .8rem 1rem; border-radius: 12px; border: 1px solid var(--border, rgba(15,23,42,.14)); background: #fff; font-size: .98rem; font-weight: 600; cursor: pointer; transition: border-color .15s ease, background .15s ease; }
.bv-quiz__opt:hover:not(.is-done) { border-color: var(--brand, #2f6fed); background: rgba(47,111,237,.04); }
.bv-quiz__opt.is-correct { background: rgba(0,184,169,.14); border-color: #0a7d72; color: #0a7d72; }
.bv-quiz__opt.is-wrong { background: rgba(220,53,69,.1); border-color: #dc3545; color: #b02a37; }
.bv-quiz__result { text-align: center; padding: 1.5rem; }
.bv-quiz__score { font-size: 2.4rem; font-weight: 800; color: var(--brand, #2f6fed); }

@media (max-width: 640px) {
  .bv-vocab-list { grid-template-columns: 1fr; }
  .bv-vocab-toolbar { flex-direction: column; align-items: stretch; }

  /* Phones: strip header fluff so the word list starts near the top.
     Back-nav stays available via the breadcrumb's term link; the level is
     already part of the lesson title. */
  .bv-vocab { padding-block: 1rem 2rem; }
  .bv-vocab-back { display: none; }
  .bv-vocab-head .pill { display: none; }
  .bv-vocab-head { margin-bottom: .85rem; }
  .bv-vocab-title { font-size: 1.15rem; }
  .bv-vocab-crumbs > *:nth-last-child(-n+2) { display: none; }
}

@media (prefers-color-scheme: dark) {
  .bv-vword, .bv-vocab-select, .bv-vocab-search input, .bv-flash__face, .bv-quiz__opt, .bv-flash__nav, .bv-flash__shuffle, .bv-flash__learn { background: rgba(255,255,255,.04); }
  .bv-vocab-view.is-active { background: rgba(255,255,255,.1); }
  .bv-vword__word, .bv-flash__word, .bv-flash__meaning, .bv-quiz__word { color: inherit; }
}
:root[data-theme="dark"] .bv-vword,
:root[data-theme="dark"] .bv-flash__face,
:root[data-theme="dark"] .bv-quiz__opt { background: rgba(255,255,255,.04); }

@media (prefers-color-scheme: dark) {
  .bv-vocab-crumbs__here { color: inherit; }
  .bv-vocab-back { background: rgba(255,255,255,.05); }
}
:root[data-theme="dark"] .bv-vocab-crumbs__here { color: inherit; }
:root[data-theme="dark"] .bv-vocab-back { background: rgba(255,255,255,.05); }

@media (prefers-color-scheme: dark) {
  .bv-vocab-index__link { background: rgba(255,255,255,.04); }
  .bv-vocab-index__title { color: inherit; }
}
:root[data-theme="dark"] .bv-vocab-index__link { background: rgba(255,255,255,.04); }
:root[data-theme="dark"] .bv-vocab-index__title { color: inherit; }