/* ==========================================================================
   Từ vựng IELTS — giao diện unit + trang lộ trình
   Mọi thứ nằm dưới .bv-ivoc / .bv-ivoc-app nên không rò ra phần còn lại của theme.
   Màu lấy từ token của site (navy --ink, teal --brand2, xanh --brand) đúng như
   các player khác; chỉ thêm một sắc vàng làm điểm nhấn cho lộ trình/band.
   Site chỉ có giao diện sáng nên không làm dark mode ở đây.
   ========================================================================== */
.bv-ivoc{
  --iv-brand:  var(--brand, #2f6fed);
  --iv-teal:   var(--brand2, #00b8a9);
  --iv-navy:   var(--ink, #0f172a);
  --iv-gold:   #f5a524;
  --iv-muted:  var(--muted, rgba(15,23,42,.62));
  --iv-border: var(--border, rgba(15,23,42,.12));
  --iv-soft:   var(--soft, rgba(15,23,42,.04));
  --iv-ok:     #15803d;
  --iv-bad:    #b91c1c;
}

/* ------------------------------------------------------------ đầu trang */
.bv-ivoc-crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:.4rem;font-size:.85rem;color:var(--iv-muted);margin-bottom:1rem}
.bv-ivoc-crumbs__here{font-weight:700;color:var(--iv-navy)}

.bv-ivoc-head{margin-bottom:1.25rem}
.bv-ivoc-head__tags{display:flex;flex-wrap:wrap;gap:.4rem;margin-bottom:.7rem}
.bv-ivoc-pill--level{background:linear-gradient(135deg,var(--iv-navy),#1e3a5f);color:#fff;border-color:transparent}
.bv-ivoc-title{font-weight:800;font-size:1.6rem;line-height:1.25;margin:0 0 .3rem;color:var(--iv-navy)}
.bv-ivoc-subtitle{color:var(--iv-muted);font-size:1rem;margin:0 0 .4rem}

.bv-ivoc-disclaimer{
  margin:1.6rem 0 0;padding:.8rem 1rem;border-radius:12px;
  background:var(--iv-soft);border:1px solid var(--iv-border);
  font-size:.8rem;line-height:1.55;color:var(--iv-muted);
}
.bv-ivoc-disclaimer span{display:block}
.bv-ivoc-disclaimer em{display:block;margin-top:.3rem;opacity:.8}

/* ---------------------------------------------------------------- tabs */
.bv-ivoc-tabs{
  display:flex;gap:.35rem;overflow-x:auto;-webkit-overflow-scrolling:touch;
  border-bottom:2px solid var(--iv-border);margin-bottom:1.25rem;padding-bottom:0;
  /* Dính lại dưới thanh điều hướng: trang unit cao gần 5000px trên điện thoại,
     để thanh chuyển phần trôi mất thì đang ở giữa phần Luyện tập muốn nhảy sang
     Kiểm tra phải cuộn ngược lên tận đầu. 78px/58px là chiều cao nav theo mốc
     576px của theme (styles.css .site-logo). */
  position:sticky;top:var(--iv-navh,78px);z-index:3;background:#fff;
  scrollbar-width:none;
}
.bv-ivoc-tabs::-webkit-scrollbar{display:none}
@media (max-width:576px){.bv-ivoc-app{--iv-navh:58px}}
.bv-ivoc-tab{
  flex:0 0 auto;display:inline-flex;align-items:center;gap:.4rem;
  border:0;background:transparent;cursor:pointer;
  padding:.6rem .85rem;font-weight:700;font-size:.92rem;color:var(--iv-muted);
  border-bottom:3px solid transparent;margin-bottom:-2px;
  transition:color .15s ease,border-color .15s ease;
}
.bv-ivoc-tab:hover{color:var(--iv-brand)}
.bv-ivoc-tab.is-active{color:var(--iv-navy);border-bottom-color:var(--iv-teal)}
.bv-ivoc-tab:focus-visible{outline:2px solid var(--iv-brand);outline-offset:2px;border-radius:6px}

/* --------------------------------------------------------------- thẻ */
.bv-ivoc-card{
  border:1px solid var(--iv-border);border-radius:16px;background:#fff;
  padding:1.1rem 1.15rem;margin-bottom:1.1rem;
}
.bv-ivoc-h2{
  display:flex;align-items:center;gap:.5rem;flex-wrap:wrap;
  font-size:1.08rem;font-weight:800;color:var(--iv-navy);margin:0 0 .6rem;
}
.bv-ivoc-h2 .bi{color:var(--iv-teal)}
.bv-ivoc-note{font-size:.9rem;color:var(--iv-muted);margin:0 0 .8rem;line-height:1.55}
.bv-ivoc-note--soft{background:var(--iv-soft);border-radius:10px;padding:.6rem .75rem;margin-top:.8rem;margin-bottom:0}
.bv-ivoc-intro{line-height:1.7;margin:0}
.bv-ivoc-goals{margin:0;padding-left:1.1rem;line-height:1.7}
.bv-ivoc-goals li{margin-bottom:.2rem}

.bv-ivoc-actions{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;margin-top:.9rem}
.bv-ivoc-score{font-weight:800;font-size:.92rem;padding:.3rem .7rem;border-radius:999px;background:var(--iv-soft)}
.bv-ivoc-score.is-pass{background:rgba(21,128,61,.12);color:var(--iv-ok)}
.bv-ivoc-score.is-fail{background:rgba(185,28,28,.1);color:var(--iv-bad)}

/* ------------------------------------------------------- Learn: từ vựng */
.bv-ivoc-learnbar{
  display:flex;flex-wrap:wrap;align-items:center;gap:.6rem;
  padding:.7rem .8rem;margin-bottom:1rem;border-radius:14px;
  background:var(--iv-soft);border:1px solid var(--iv-border);
}
.bv-ivoc-search{position:relative;flex:1 1 200px;display:flex;align-items:center}
.bv-ivoc-search .bi{position:absolute;left:.65rem;color:var(--iv-muted);pointer-events:none}
.bv-ivoc-search input{
  width:100%;border:1px solid var(--iv-border);border-radius:10px;background:#fff;
  padding:.45rem .7rem .45rem 2rem;font-size:.92rem;
}
.bv-ivoc-toggle{display:inline-flex;align-items:center;gap:.4rem;font-size:.88rem;font-weight:600;cursor:pointer}
.bv-ivoc-known{margin-left:auto;font-weight:700;font-size:.88rem;color:var(--iv-navy);white-space:nowrap}
.bv-ivoc-known .bi{color:var(--iv-ok)}

.bv-ivoc-items{display:grid;gap:.85rem}
.bv-ivitem{
  border:1px solid var(--iv-border);border-left:4px solid var(--iv-teal);
  border-radius:14px;background:#fff;padding:.95rem 1rem;
}
.bv-ivitem.is-known{border-left-color:var(--iv-ok);background:rgba(21,128,61,.03)}
.bv-ivitem__top{display:flex;flex-wrap:wrap;align-items:center;gap:.45rem;margin-bottom:.4rem}
.bv-ivitem__word{font-size:1.12rem;font-weight:800;color:var(--iv-navy);margin:0}
.bv-ivitem__ipa{font-size:.86rem;color:var(--iv-muted);font-family:ui-monospace,Menlo,Consolas,monospace}
.bv-ivitem__pos{font-size:.74rem;font-weight:700;padding:.12rem .45rem;border-radius:999px;background:var(--iv-soft);color:var(--iv-muted)}
.bv-ivitem__reg{font-size:.72rem;font-weight:700;padding:.12rem .45rem;border-radius:999px;border:1px solid var(--iv-border);color:var(--iv-muted)}
.bv-ivitem__reg[data-reg="academic"],
.bv-ivitem__reg[data-reg="formal"]{background:rgba(47,111,237,.1);color:var(--iv-brand);border-color:transparent}
.bv-ivitem__reg[data-reg="informal"]{background:rgba(245,165,36,.15);color:#a15c00;border-color:transparent}
.bv-ivitem__tools{margin-left:auto;display:flex;gap:.35rem}
.bv-ivitem__btn{
  display:inline-flex;align-items:center;gap:.3rem;
  border:1px solid var(--iv-border);background:#fff;border-radius:999px;
  padding:.25rem .6rem;font-size:.78rem;font-weight:700;color:var(--iv-muted);cursor:pointer;
}
.bv-ivitem__btn:hover{border-color:var(--iv-brand);color:var(--iv-brand)}
.bv-ivitem.is-known .bv-ivitem__btn--know{background:rgba(21,128,61,.12);color:var(--iv-ok);border-color:transparent}

.bv-ivitem__def{margin:0 0 .25rem;line-height:1.6}
.bv-ivitem__vi{margin:0 0 .45rem;color:var(--iv-brand);font-weight:600}
.bv-ivitem__ex{display:flex;gap:.4rem;margin:0 0 .6rem;font-style:italic;color:var(--iv-navy);line-height:1.6}
.bv-ivitem__ex .bi{color:var(--iv-teal);font-style:normal;flex-shrink:0}
.bv-ivitem__exvi{display:block;font-style:normal;color:var(--iv-muted);font-size:.88rem;margin-top:.15rem}

.bv-ivitem__grid{display:grid;gap:.6rem;grid-template-columns:1fr}
.bv-ivitem__box{background:var(--iv-soft);border-radius:10px;padding:.6rem .75rem}
.bv-ivitem__box h4{font-size:.78rem;font-weight:800;text-transform:uppercase;letter-spacing:.03em;color:var(--iv-muted);margin:0 0 .35rem}
.bv-ivitem__box ul{margin:0;padding-left:1rem;font-size:.9rem;line-height:1.65}
.bv-ivitem__box em{font-style:normal;color:var(--iv-muted);font-size:.82rem}
.bv-ivitem__syn,.bv-ivitem__ant{margin:0;font-size:.9rem;line-height:1.6}
.bv-ivitem__box--warn{background:rgba(245,165,36,.1)}
.bv-ivitem__box--warn h4{color:#a15c00}
.bv-ivitem__wrong,.bv-ivitem__right,.bv-ivitem__note{margin:0 0 .2rem;font-size:.9rem;line-height:1.55}
.bv-ivitem__x{color:var(--iv-bad);font-weight:800}
.bv-ivitem__v{color:var(--iv-ok);font-weight:800}
.bv-ivitem__note{color:var(--iv-muted);font-size:.85rem}

/* Tắt bản dịch: ẩn mọi phần tiếng Việt trong bài. */
.bv-ivoc-app.is-vi-off [data-vi]{display:none !important}

.bv-ivoc-empty{text-align:center;color:var(--iv-muted);padding:1.5rem 0}

/* ------------------------------------------------------------- câu hỏi */
.bv-ivoc-qs{display:grid;gap:.75rem}
.bv-ivq{border:1px solid var(--iv-border);border-radius:12px;padding:.75rem .85rem;background:#fff}
.bv-ivq.is-correct{border-color:rgba(21,128,61,.45);background:rgba(21,128,61,.04)}
.bv-ivq.is-wrong{border-color:rgba(185,28,28,.4);background:rgba(185,28,28,.03)}
.bv-ivq__head{display:flex;gap:.45rem;align-items:baseline;margin-bottom:.5rem}
.bv-ivq__no{font-weight:800;color:var(--iv-muted);flex-shrink:0}
.bv-ivq__prompt{font-weight:600;line-height:1.55}
.bv-ivq__prompt--block{margin:0 0 .5rem}

.bv-ivq__opts{display:grid;gap:.35rem}
.bv-ivq__opt{
  display:flex;align-items:flex-start;gap:.5rem;cursor:pointer;
  border:1px solid var(--iv-border);border-radius:10px;padding:.45rem .6rem;
  font-size:.94rem;line-height:1.5;transition:border-color .12s ease,background .12s ease;
}
.bv-ivq__opt:hover{border-color:var(--iv-brand);background:rgba(47,111,237,.03)}
.bv-ivq__opt input{margin-top:.28rem;flex-shrink:0}
.bv-ivq__optkey{font-weight:800;color:var(--iv-muted);flex-shrink:0}

.bv-ivq__select{
  border:1px solid var(--iv-border);border-radius:9px;padding:.35rem .5rem;
  font-weight:700;font-size:.94rem;background:#fff;min-width:5rem;
}
.bv-ivq__select--wide{min-width:min(100%,22rem);font-weight:500}

.bv-ivq__fill{display:inline;line-height:2.1}
.bv-ivq__text{
  border:0;border-bottom:2px solid var(--iv-brand);background:transparent;
  padding:.1rem .35rem;min-width:7rem;font-size:.96rem;font-weight:600;color:var(--iv-navy);
}
.bv-ivq__text:focus{outline:none;background:rgba(47,111,237,.06)}
.bv-ivq__before,.bv-ivq__after{line-height:1.9}

.bv-ivq__built{
  display:flex;flex-wrap:wrap;gap:.3rem;min-height:2.6rem;align-items:center;
  border:2px dashed var(--iv-border);border-radius:10px;padding:.4rem;margin-bottom:.5rem;
}
.bv-ivq__built:empty::before{content:attr(data-placeholder);color:var(--iv-muted);font-size:.85rem}
.bv-ivq__chips{display:flex;flex-wrap:wrap;gap:.3rem}
.bv-ivq__chip{
  border:1px solid var(--iv-border);background:#fff;border-radius:8px;
  padding:.28rem .55rem;font-size:.9rem;cursor:pointer;
}
.bv-ivq__chip:hover{border-color:var(--iv-brand);color:var(--iv-brand)}
.bv-ivq__built .bv-ivq__chip{background:rgba(47,111,237,.08);border-color:transparent}

.bv-ivq__hint{margin:.45rem 0 0;font-size:.84rem;color:var(--iv-muted)}
.bv-ivq__hint .bi{color:var(--iv-gold)}

.bv-ivq__fb{margin-top:.55rem;padding-top:.5rem;border-top:1px dashed var(--iv-border);font-size:.9rem;line-height:1.6}
.bv-ivq__mark{font-weight:800}
.is-correct .bv-ivq__mark,.is-correct .bv-ivq__fb strong{color:var(--iv-ok)}
.is-wrong .bv-ivq__mark,.is-wrong .bv-ivq__fb strong{color:var(--iv-bad)}
.bv-ivq__ans{margin-top:.2rem}
.bv-ivq__why{margin-top:.25rem;color:var(--iv-muted)}

.bv-ivoc-legend{
  margin:0 0 .9rem;padding:.6rem .75rem .6rem 1rem;list-style:none;
  background:var(--iv-soft);border-radius:10px;font-size:.9rem;line-height:1.7;
}
.bv-ivoc-legend li{display:flex;gap:.5rem}
.bv-ivoc-legend__k{font-weight:800;color:var(--iv-brand);flex-shrink:0;min-width:1.2rem}

/* --------------------------------------------------------- Apply */
.bv-ivoc-passage{
  background:var(--iv-soft);border-radius:12px;padding:.9rem 1rem;
  line-height:1.8;white-space:pre-line;margin-bottom:.8rem;
}
.bv-ivoc-passage--vi{background:rgba(47,111,237,.05);color:var(--iv-muted);font-size:.94rem}
.bv-ivoc-audio{display:block;width:100%;margin:0 0 .9rem;border-radius:10px}
.bv-ivoc-audio--sm{max-width:420px;margin:.15rem 0 .5rem}
.bv-ivoc-speak--shadow{list-style:decimal;padding-left:1.25rem}
.bv-ivoc-speak--shadow>li{margin-bottom:1.1rem}
.bv-ivoc-speak__q{font-weight:600;margin:0 0 .4rem}
.bv-ivoc-details{margin-bottom:.8rem}
.bv-ivoc-details summary{cursor:pointer;font-weight:700;font-size:.9rem;color:var(--iv-brand);padding:.3rem 0}

.bv-ivoc-write{border-top:1px solid var(--iv-border);padding-top:.9rem;margin-top:.9rem}
.bv-ivoc-write:first-of-type{border-top:0;padding-top:0;margin-top:0}
.bv-ivoc-write__prompt{font-weight:600;line-height:1.6;margin:0 0 .5rem}
.bv-ivoc-write__area{
  width:100%;border:1px solid var(--iv-border);border-radius:10px;
  padding:.6rem .75rem;font-size:.95rem;line-height:1.6;resize:vertical;
}
.bv-ivoc-write__area:focus{outline:2px solid rgba(47,111,237,.35);outline-offset:1px}
.bv-ivoc-wordcount{font-size:.82rem;color:var(--iv-muted);margin-left:auto}
.bv-ivoc-sample{margin-top:.7rem;background:rgba(0,184,169,.07);border-radius:10px;padding:.7rem .85rem;line-height:1.7}
.bv-ivoc-sample h4{font-size:.82rem;font-weight:800;text-transform:uppercase;letter-spacing:.03em;color:var(--iv-teal);margin:0 0 .3rem}
.bv-ivoc-sample p{margin:0}

.bv-ivoc-speak{margin:.6rem 0 0;padding-left:1.2rem;line-height:1.8}
.bv-ivoc-timer{font-weight:800;font-size:1rem;color:var(--iv-brand);font-variant-numeric:tabular-nums}
.bv-ivoc-rec audio{width:100%;margin-top:.6rem}

/* --------------------------------------------------------- kết quả test */
.bv-ivoc-result{margin-top:1rem;border-top:1px solid var(--iv-border);padding-top:.9rem;line-height:1.7}
.bv-ivoc-result__head{display:flex;align-items:center;gap:.7rem;margin-bottom:.6rem}
.bv-ivoc-result__icon{
  width:38px;height:38px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;
  font-size:1.15rem;font-weight:800;flex-shrink:0;
}
.bv-ivoc-result__head.is-pass .bv-ivoc-result__icon{background:rgba(21,128,61,.12);color:var(--iv-ok)}
.bv-ivoc-result__head.is-fail .bv-ivoc-result__icon{background:rgba(245,165,36,.18);color:#a15c00}
.bv-ivoc-weak{margin:.3rem 0 0;padding-left:1.1rem;font-weight:600}

/* ============================ trang lộ trình ============================ */
.bv-ivroad__hero{margin-bottom:1.5rem}
.bv-ivroad__band{
  display:inline-flex;align-items:center;gap:.4rem;padding:.3rem .8rem;border-radius:999px;
  background:linear-gradient(135deg,var(--iv-navy),#1e3a5f);color:#fff;font-weight:700;font-size:.85rem;
}
.bv-ivroad__level{border:1px solid var(--iv-border);border-radius:18px;background:#fff;margin-bottom:1.1rem;overflow:hidden}
.bv-ivroad__head{
  display:flex;flex-wrap:wrap;align-items:center;gap:.6rem;
  padding:.9rem 1.05rem;border-bottom:1px solid var(--iv-border);background:var(--iv-soft);
}
.bv-ivroad__no{
  width:34px;height:34px;border-radius:10px;flex-shrink:0;
  display:inline-flex;align-items:center;justify-content:center;
  font-weight:800;color:#fff;background:var(--iv-navy);
}
.bv-ivroad__name{font-weight:800;font-size:1.05rem;color:var(--iv-navy);margin:0}
.bv-ivroad__target{font-size:.82rem;color:var(--iv-muted);font-weight:700}
.bv-ivroad__count{margin-left:auto;font-size:.82rem;font-weight:700;color:var(--iv-muted)}
.bv-ivroad__goals{margin:0;padding:.75rem 1.05rem 0 2.1rem;font-size:.88rem;line-height:1.65;color:var(--iv-muted)}
.bv-ivroad__units{
  display:grid;gap:.5rem;padding:.85rem 1.05rem 1.05rem;
  grid-template-columns:repeat(auto-fill,minmax(220px,1fr));
}
.bv-ivroad__unit{
  display:flex;align-items:flex-start;gap:.55rem;
  border:1px solid var(--iv-border);border-radius:12px;padding:.55rem .7rem;
  color:var(--iv-navy);text-decoration:none;font-size:.9rem;line-height:1.45;
  transition:border-color .12s ease,box-shadow .12s ease;
}
.bv-ivroad__unit:hover{border-color:var(--iv-brand);box-shadow:0 6px 16px rgba(15,23,42,.07);color:var(--iv-navy)}
.bv-ivroad__unit--soon{opacity:.62;cursor:default;background:var(--iv-soft)}
.bv-ivroad__unit--soon:hover{border-color:var(--iv-border);box-shadow:none}
.bv-ivroad__unitno{
  width:26px;height:26px;border-radius:8px;flex-shrink:0;
  display:inline-flex;align-items:center;justify-content:center;
  font-size:.76rem;font-weight:800;background:var(--iv-soft);color:var(--iv-muted);
}
.bv-ivroad__unit:not(.bv-ivroad__unit--soon) .bv-ivroad__unitno{background:rgba(0,184,169,.14);color:#0b7f76}
.bv-ivroad__unitvi{display:block;font-size:.8rem;color:var(--iv-muted)}
.bv-ivroad__chk{
  display:inline-block;margin-left:.3rem;font-size:.68rem;font-weight:800;
  padding:.05rem .35rem;border-radius:5px;background:rgba(245,165,36,.2);color:#a15c00;
}

/* ------------------------------------------------------------ màn hình lớn */
@media (min-width:768px){
  .bv-ivoc-title{font-size:2rem}
  .bv-ivitem__grid{grid-template-columns:1fr 1fr}
  .bv-ivoc-card{padding:1.3rem 1.4rem}
}

/* --------------------------------------------------------- màn hình nhỏ */
@media (max-width:576px){
  /* Ô chọn đáp án cao 39px là hơi nhỏ để bấm bằng ngón tay; nới đệm cho đủ
     tầm ~44px mà không đổi gì trên máy tính. */
  .bv-ivq__opt{padding:.6rem .7rem}
}

/* Tôn trọng thiết lập giảm chuyển động của hệ điều hành. */
@media (prefers-reduced-motion:reduce){
  .bv-ivoc-tab,.bv-ivq__opt,.bv-ivroad__unit{transition:none}
}