@import url('https://fonts.googleapis.com/css2?family=Noto+Serif:wght@400;500;600;700;800;900&family=Noto+Serif+SC:wght@400;500;600;700;800;900&display=swap');

:root{
  --ink:#4A3B63;--ink-soft:#7C6E92;
  --lavender-1:#F7F1FC;--lavender-2:#ECE1F7;--lavender-3:#DDCBEE;
  --mauve:#B79FD4;--mauve-dark:#8E6FB8;--mauve-deep:#6B4E8C;
  --gold:#CBA55C;--gold-light:#EDD9A8;--parchment:#FDF8EF;--parchment-dark:#F1E7D3;
  --green:#5C9C6C;--red:#C97A82;
  --text:var(--ink);--text-soft:var(--ink-soft);--radius:16px;
  --shadow:0 4px 18px rgba(107,78,140,.15);
}
*{box-sizing:border-box}
body{
  margin:0;font-family:'Noto Serif','Noto Serif SC','Noto Serif CJK SC','Segoe UI',system-ui,sans-serif;color:var(--text);
  background:
    linear-gradient(180deg, rgba(247,241,252,.72) 0%, rgba(236,225,247,.72) 55%, rgba(221,203,238,.78) 100%),
    url('../images/lesson-bg.jpg');
  background-size:cover;background-position:center;background-repeat:no-repeat;background-attachment:fixed;
  min-height:100vh;
  display:flex;flex-direction:column;
}
/* mist / cloud motif drifting near the top */
body::before{
  content:"";position:fixed;top:0;left:0;right:0;height:90px;pointer-events:none;opacity:.55;z-index:0;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='50'%3E%3Cpath d='M10 35 Q25 12 42 28 Q55 6 72 25 Q88 10 105 24' stroke='%23B79FD4' stroke-width='2' fill='none' opacity='.55'/%3E%3C/svg%3E");
  background-repeat:repeat-x;background-size:220px 50px;
}

#hskNav{font-family:'Noto Serif','Noto Serif SC','Noto Serif CJK SC','Segoe UI',system-ui,sans-serif;background:linear-gradient(90deg,var(--parchment),var(--lavender-2));
  color:var(--mauve-deep);display:flex;align-items:center;
  gap:.55rem;padding:.6rem .9rem;flex-wrap:wrap;box-shadow:0 2px 10px rgba(107,78,140,.12);
  border-bottom:1px solid var(--gold-light)}
#hskNav a{color:var(--mauve-deep);text-decoration:none;font-size:.8rem;font-weight:700;padding:.35rem .65rem;
  border-radius:7px;background:rgba(183,159,212,.18);white-space:nowrap;border:1px solid rgba(183,159,212,.35)}
#hskNav a:hover{background:rgba(183,159,212,.35)}
#hskNav a.disabled{opacity:.35;pointer-events:none}
#hskNav .ttl{font-size:.82rem;font-weight:700;margin-right:auto;color:var(--mauve-deep)}
#hskNav .navContact{font-size:.72rem;color:var(--mauve-deep);opacity:.75;white-space:nowrap;font-weight:600}
#hskNav select{font-size:.8rem;font-weight:700;padding:.32rem .5rem;border-radius:7px;border:1px solid var(--mauve);
  background:#fff;color:var(--mauve-deep);cursor:pointer}
@media(max-width:560px){#hskNav .ttl{width:100%;order:-1;margin-bottom:.15rem}}

/* Đồng bộ layout Sách bài tập với HSK2 Bài 1 */
#pageHeaderStack{overflow:hidden;transition:max-height .28s ease,opacity .22s ease}
body.hdrCollapsed #pageHeaderStack{opacity:0;pointer-events:none}
.lessonHead{text-align:center;padding:1.3rem 1rem .4rem;position:relative;z-index:1}
.lessonHead h1{font-family:'Noto Serif SC',serif;font-size:1.75rem;font-weight:700;color:var(--mauve-deep);
  margin:0 0 .2rem;text-shadow:0 2px 14px rgba(255,255,255,.85),0 1px 3px rgba(255,255,255,.9)}
.lessonHead h1 .lessonTitleVi{display:block;font-family:'Segoe UI',system-ui,sans-serif;
  font-size:1.05rem;font-weight:600;color:var(--text-soft);margin-top:.25rem;text-shadow:none}
.lessonHead p{font-size:.85rem;color:var(--text-soft);margin:0;text-shadow:0 1px 8px rgba(255,255,255,.8)}

.tabBar{display:flex;justify-content:center;gap:.45rem;padding:.8rem 1rem;flex-wrap:wrap;position:relative;z-index:1}
.tabGroup{display:flex;flex-direction:column;gap:.45rem;width:100%}
.tabGroupHead{background:#fff;color:var(--mauve-deep);font-weight:700;border:1px solid var(--gold-light);
  font-size:.85rem;padding:.5rem .9rem;border-radius:999px;text-align:center;box-shadow:var(--shadow);cursor:pointer}
.tabGroupHead.active{background:linear-gradient(135deg,var(--mauve),var(--mauve-dark));color:#fff;border-color:var(--mauve-dark)}
.tabBtn{border:1px solid var(--mauve);background:#fff;color:var(--mauve-deep);font-weight:700;font-size:.92rem;
  padding:.5rem .9rem;border-radius:999px;cursor:pointer;box-shadow:var(--shadow)}
.tabBtn.active{background:linear-gradient(135deg,var(--mauve),var(--mauve-dark));color:#fff;border-color:var(--mauve-dark)}
.tabGroup .tabBtn{margin-left:16px;width:calc(100% - 16px);box-sizing:border-box;font-size:.95rem;font-weight:600;border-color:var(--gold-light);padding:.65rem 1rem}
.tabGroup .tabBtn small{display:block;font-size:1rem;font-weight:600;color:var(--mauve);margin-top:.2rem}
.tabGroup .tabBtn.active small{color:#fff}
@media(min-width:900px){
  body{padding-left:230px}
  .tabBar{position:fixed;left:20px;top:100px;width:200px;
    flex-direction:column;align-items:stretch;flex-wrap:nowrap;padding:0;z-index:20;gap:.55rem}
  .tabBtn{text-align:center;width:100%;box-sizing:border-box}
  .artSideOuter{display:flex!important}
}
.artSideOuter{position:fixed;right:max(10px,calc(50% - 560px));top:130px;width:130px;
  display:none;justify-content:center;z-index:1;pointer-events:none}
.artSideOuter svg{width:110px;opacity:.8}
.tabPanel{display:none;max-width:1000px;width:100%;margin:0 auto;padding:0 1rem 0;position:relative;z-index:1;box-sizing:border-box}
.tabPanel.active{display:flex;flex-direction:column;align-items:stretch;justify-content:center;flex:1 1 auto;
  background:rgba(255,255,255,.55);border-radius:24px;padding:2.4rem 1.6rem;margin-top:.8rem;
  box-shadow:0 4px 24px rgba(107,78,140,.1);box-sizing:border-box}
#tab-luyentap.active{display:flex;flex-direction:column;max-width:1500px;background:none;box-shadow:none;
  padding:0;margin-top:0;justify-content:flex-start;align-items:stretch}

/* Sách bài tập: cùng quy cách HSK2 Bài 1 */
#tab-workbook.active{display:flex;flex-direction:column;max-width:1500px;background:none;box-shadow:none;
  padding:0;margin-top:0;justify-content:flex-start;align-items:stretch}

.subTabBar{display:flex;justify-content:center;gap:.4rem;margin-bottom:.6rem}
.subTabBtn{border:1px solid var(--gold-light);background:#fff;color:var(--mauve-deep);font-weight:600;font-size:.95rem;
  padding:.65rem 1rem;border-radius:999px;cursor:pointer;margin-left:16px;width:calc(100% - 16px);box-sizing:border-box}
.subTabBtn small{display:block;font-size:1rem;font-weight:600;color:var(--mauve);margin-top:.2rem}
.subTabBtn.active small{color:#fff}
.subTabBar.subtabDim .subTabBtn.active small{color:var(--mauve)}
.subTabBtn.active{background:var(--mauve);color:#fff}
.subTabBar.subtabDim .subTabBtn.active{background:#fff;color:var(--mauve-deep)}
@media(min-width:900px){
  .subTabBar{position:fixed;left:20px;top:360px;width:200px;
    flex-direction:column;align-items:stretch;z-index:20;gap:.45rem}
  .subTabBtn{text-align:center;width:calc(100% - 16px);box-sizing:border-box}
}
.subTabBar.subtabDim{display:none}

.modeCounter{text-align:center;font-size:.82rem;color:var(--text-soft);margin-bottom:.6rem}
.modeScore{text-align:center;font-size:.78rem;color:var(--text-soft);margin-top:.5rem}

.fcCard,.fbSentence,.roTarget,.roPool,.wrPrompt{
  background:var(--parchment);border:1px solid var(--gold-light);
}

.fcCard{border-radius:var(--radius);box-shadow:var(--shadow);min-height:280px;
  display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;
  padding:2.2rem 1.6rem;cursor:pointer;position:relative;gap:.6rem}
.fcHanzi{font-family:'Noto Serif SC',serif;font-size:4.8rem;font-weight:700;color:var(--mauve-deep)}
.fcSpeak{position:absolute;top:.7rem;right:.9rem;font-size:1.3rem;background:none;border:none;cursor:pointer}
.fcHint{font-size:.98rem;color:#a99cb8;margin-top:.3rem}
.fcBack{display:none;flex-direction:column;gap:.3rem;align-items:center}
.fcCard.flipped .fcFront{display:none}
.fcCard.flipped .fcBack{display:flex}
.fcHv{font-size:1.05rem;color:#a99cb8}
.fcWc{display:inline-block;font-size:.88rem;background:var(--mauve);color:#fff;
  border-radius:20px;padding:.15rem .7rem;margin-bottom:.15rem}
.fcPinyin{font-size:1.7rem;font-weight:700;color:var(--mauve-dark)}
.fcMeaning{font-size:1.4rem;font-weight:600;color:var(--text)}
.fcExample{margin-top:.5rem;font-size:1.15rem;color:var(--text);border-top:1px dashed var(--gold);padding-top:.5rem}
.fcExampleVi{font-size:1rem;color:var(--text-soft);margin-top:.15rem}
.rowNav{display:flex;justify-content:center;gap:.6rem;margin-top:1rem;flex-wrap:wrap}
.rowNav button{border:1px solid var(--mauve);background:#fff;box-shadow:var(--shadow);color:var(--mauve-deep);
  font-weight:700;font-size:.82rem;padding:.55rem 1rem;border-radius:10px;cursor:pointer}
.rowNav button:hover{background:var(--lavender-2)}
.rowNav button:disabled{opacity:.4;cursor:default}

.fbSentence{border-radius:var(--radius);box-shadow:var(--shadow);padding:2.1rem 1.9rem;
  font-size:1.9rem;line-height:2;text-align:center;color:var(--text)}
.fbBlank{display:inline-block;min-width:2.6em;border-bottom:3px solid var(--mauve-dark);color:var(--mauve-deep);
  font-weight:700;padding:0 .25em}
.fbMeaning{font-size:1.15rem;color:var(--text-soft);margin-top:.7rem}
.fbInputRow{display:flex;gap:.5rem;margin-top:1rem;justify-content:center;flex-wrap:wrap}
.fbInputRow input{font-size:.88rem;padding:.5rem .7rem;border-radius:10px;border:2px solid var(--gold);
  width:210px;max-width:70vw;text-align:center;font-family:inherit;background:#fff;color:var(--text)}
#roInput{width:460px;min-width:460px;max-width:85vw;font-size:1.55rem;padding:.85rem 1.1rem}
#fbInput{width:460px;min-width:460px;max-width:85vw;font-size:1.55rem;padding:.85rem 1.1rem}
#wrInput{width:460px;min-width:460px;max-width:85vw;font-size:1.55rem;padding:.85rem 1.1rem}
.fbInputRow button{border:none;background:linear-gradient(135deg,var(--mauve-dark),var(--mauve-deep));color:#fff;font-weight:700;font-size:.9rem;
  padding:.5rem 1.1rem;border-radius:10px;cursor:pointer}
.fbFeedback{text-align:center;margin-top:.6rem;font-weight:700;font-size:1.3rem;min-height:1.3rem;color:var(--mauve-deep)}
.fbFeedback.correct{color:var(--green)}
.fbFeedback.wrong{color:var(--red)}

.roTarget{min-height:60px;border-radius:var(--radius);box-shadow:var(--shadow);
  padding:.9rem;display:flex;flex-wrap:wrap;gap:.4rem;align-items:center;justify-content:center}
.roPool{min-height:60px;margin-top:.7rem;padding:.9rem;display:flex;flex-wrap:wrap;gap:.4rem;
  align-items:center;justify-content:center;background:var(--lavender-1);border-radius:var(--radius)}
.roChip{background:var(--lavender-2);color:var(--mauve-deep);font-weight:700;font-size:1.6rem;
  padding:.6rem 1rem;border-radius:9px;cursor:pointer;user-select:none;box-shadow:0 1px 3px rgba(0,0,0,.1);border:1px solid var(--mauve)}
.roChip:hover{background:var(--mauve);color:#fff}
.roChipRef{cursor:default;pointer-events:none;opacity:.9}
.roChipRef:hover{background:var(--lavender-2)}
.roChipPunct{background:var(--lavender-2);color:var(--mauve-deep);cursor:default;pointer-events:none;opacity:.95}
.roChipPunct:hover{background:var(--lavender-2)}
.roMeaning{font-size:.8rem;color:var(--text-soft);margin-top:.5rem;text-align:center}

.wrPrompt{border-radius:var(--radius);box-shadow:var(--shadow);padding:1.5rem 1.2rem;text-align:center}
.wrMeaning{font-size:1.95rem;font-weight:700;color:var(--text)}
.wrPinyin{font-size:1.25rem;color:var(--text-soft);margin-top:.2rem}
.wrInputRow{display:flex;gap:.5rem;margin-top:1rem;justify-content:center;flex-wrap:wrap}
.wrInputRow input{font-size:.92rem;padding:.5rem .7rem;border-radius:10px;border:2px solid var(--gold);
  width:220px;max-width:70vw;text-align:center;font-family:inherit;background:#fff;color:var(--text)}
.wrInputRow button{border:none;background:linear-gradient(135deg,var(--mauve-dark),var(--mauve-deep));color:#fff;font-weight:700;font-size:.9rem;
  padding:.5rem 1.1rem;border-radius:10px;cursor:pointer}
.wrFeedback{text-align:center;margin-top:.6rem;font-weight:700;font-size:1.3rem;min-height:1.3rem;color:var(--mauve-deep)}
.wrFeedback.correct{color:var(--green)}
.wrFeedback.wrong{color:var(--red)}
.wrSummaryBox{background:var(--parchment);border:1px solid var(--gold-light);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:1.4rem 1.2rem;text-align:center;color:var(--text)}
.wrSummaryBox h3{font-family:'Noto Serif SC',serif;font-weight:700;color:var(--mauve-deep);font-size:1.4rem;margin:0 0 .6rem}
.wrSummaryBox p{margin:.25rem 0;font-size:.95rem}

.ltFrame{width:100%;height:82vh;flex:1 1 auto;min-height:420px;border:1px solid var(--gold-light);border-radius:var(--radius);box-shadow:var(--shadow);
  background:var(--parchment)}
.wbFrame{width:100%;height:82vh;flex:1 1 auto;min-height:420px;border:1px solid var(--gold-light);border-radius:var(--radius);box-shadow:var(--shadow);
  background:var(--parchment)}
.wbHint{text-align:center;font-size:.76rem;color:var(--text-soft);margin:.5rem 0 .8rem}

.siteFooter{text-align:center;padding:1.6rem 1rem 2rem;font-size:.8rem;color:var(--text-soft);
  border-top:1px solid var(--gold-light);margin-top:0;position:relative;z-index:1}
.siteFooter b{color:var(--mauve-deep)}
.siteFooter a{color:var(--mauve-deep);text-decoration:none}

/* ===================== BÀI KHÓA (mới, riêng cho HSK1 3.0) ===================== */
.bkMain{background:var(--parchment);border:1px solid var(--gold-light);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:2.2rem 1.8rem;text-align:center;margin-bottom:1.4rem}
.bkZh{font-family:'Noto Serif SC',serif;font-size:2.3rem;font-weight:700;color:var(--mauve-deep);line-height:1.55}
.bkSpeak{margin-top:.7rem;border:1px solid var(--mauve);background:#fff;color:var(--mauve-deep);font-weight:700;
  font-size:.85rem;padding:.4rem .95rem;border-radius:999px;cursor:pointer;box-shadow:var(--shadow)}
.bkSpeak:hover{background:var(--lavender-2)}
.bkPinyin{margin-top:.9rem;font-size:1.25rem;color:var(--mauve-dark);font-weight:600}
.bkVi{margin-top:.35rem;font-size:1.08rem;color:var(--text-soft)}
.bkDialogueTitle{font-family:'Noto Serif SC',serif;font-weight:700;color:var(--mauve-deep);font-size:1.1rem;
  margin:.3rem 0 .8rem;text-align:center}
.bkLine{background:rgba(255,255,255,.6);border:1px solid var(--gold-light);border-radius:12px;
  padding:.95rem 1.3rem;margin-bottom:.7rem}
.bkLine .zh{font-family:'Noto Serif SC',serif;font-size:1.35rem;color:var(--text);margin-bottom:.2rem}
.bkLine .py{font-size:.85rem;color:var(--mauve-dark)}
.bkLine .vi{font-size:.93rem;color:var(--text-soft);margin-top:.2rem}
.bkPlaceholder{text-align:center;color:var(--text-soft);font-size:.92rem;line-height:1.7;padding:1.5rem 1.2rem;
  border:1px dashed var(--mauve);border-radius:var(--radius);background:rgba(255,255,255,.4)}


/* ===================== TỪ MỚI dạng gộp theo Bài khóa (sidebar trái = Bài khóa 1/2/3;
   mỗi Bài khóa hiện đủ 4 phần luyện tập liền nhau, không cần bấm thêm) ===================== */
.vocabSection{display:none}
.vocabSection.active{display:block}
.vocabSecTitle{font-family:'Noto Serif SC',serif;font-weight:700;font-size:1.15rem;color:var(--mauve-deep);
  text-align:center;margin:0 0 1rem;padding-bottom:.5rem;border-bottom:2px solid var(--gold-light)}
.vocabSecTitle small{display:inline-block;margin-left:.4rem;font-size:.85rem;font-weight:600;color:var(--mauve)}

/* Tab ngang chọn chế độ (Thẻ từ/Điền từ/Sắp xếp câu/Viết chữ) bên trong 1 Bài khóa */
.modeTabBar{display:flex;justify-content:center;gap:.5rem;flex-wrap:wrap;margin:0 0 1.4rem}
.modeTabBtn{border:1.5px solid var(--mauve);background:#fff;color:var(--mauve-deep);font-weight:700;font-size:.9rem;
  padding:.55rem 1.1rem;border-radius:999px;cursor:pointer;box-shadow:var(--shadow);text-align:center}
.modeTabBtn small{display:block;font-size:.78rem;font-weight:600;color:var(--mauve);margin-top:.1rem}
.modeTabBtn.active{background:linear-gradient(135deg,var(--mauve),var(--mauve-dark));color:#fff;border-color:var(--mauve-dark)}
.modeTabBtn.active small{color:#fff}
.modeTabBtn:hover{background:var(--lavender-2)}
.modeTabBtn.active:hover{background:var(--mauve-dark)}

/* ===================== NỐI CHỮ HÁN — PHIÊN ÂM / NGHĨA (2 chế độ mới, sau tab Thẻ từ) ===================== */
.matchToolbar{display:flex;justify-content:center;margin-bottom:.6rem}
.matchResetBtn{border:1px solid var(--mauve);background:#fff;color:var(--mauve-deep);font-weight:700;font-size:.85rem;
  padding:.5rem 1rem;border-radius:10px;cursor:pointer;box-shadow:var(--shadow)}
.matchResetBtn:hover{background:var(--lavender-2)}
.matchHint{text-align:center;font-size:.88rem;color:var(--text-soft);margin-bottom:1.1rem}
.matchGrid{display:grid;grid-template-columns:1fr 1fr;gap:1rem 1.2rem;max-width:720px;margin:0 auto;align-items:stretch}
.matchCol{display:contents}
.matchItem{background:var(--parchment);border:2px solid var(--gold-light);border-radius:12px;
  padding:.75rem .9rem;text-align:center;cursor:pointer;user-select:none;box-shadow:var(--shadow);
  transition:.15s;font-weight:600;color:var(--text);
  display:flex;align-items:center;justify-content:center;min-height:3.3rem;line-height:1.3}
.matchItem.matchItem-zh{font-family:'Noto Serif SC',serif;font-size:1.35rem;color:var(--mauve-deep)}
.matchItem.matchItem-txt{font-size:1rem}
.matchItem:hover{border-color:var(--mauve)}
.matchItem.matchSelected{border-color:var(--mauve-dark);background:var(--lavender-2);box-shadow:0 0 0 2px rgba(142,111,184,.3)}
.matchItem.matchCorrect{border-color:var(--green);background:#EAF6EC;color:var(--green);cursor:default;pointer-events:none}
.matchItem.matchWrong{border-color:var(--red);background:#FBEAEC;color:var(--red)}
.matchScore{text-align:center;font-size:.85rem;color:var(--text-soft);margin-top:1rem}
@media(max-width:560px){.matchGrid{gap:.7rem}.matchItem{padding:.6rem .5rem;font-size:.92rem;min-height:2.9rem}.matchItem.matchItem-zh{font-size:1.15rem}}

/* ===================== THỐNG KÊ HỌC TẬP (không tính Thẻ từ) ===================== */
.statsBar{display:flex;justify-content:center;gap:1.2rem;flex-wrap:wrap;margin:0 0 1.4rem;
  padding:.6rem 1rem;background:var(--lavender-1);border:1px solid var(--gold-light);border-radius:999px;
  max-width:520px;margin-left:auto;margin-right:auto}
.statsItem{font-size:.88rem;font-weight:700;color:var(--mauve-deep)}
@media(max-width:480px){.statsBar{flex-direction:column;align-items:center;gap:.3rem;border-radius:14px}}

/* ===================== NGHE CHỌN ĐÁP ÁN (nghĩa / chữ Hán) ===================== */
.listenBox{display:flex;justify-content:center;margin-bottom:1.2rem}
.listenPlayBtn{border:none;background:linear-gradient(135deg,var(--mauve),var(--mauve-dark));color:#fff;
  font-weight:700;font-size:1rem;padding:.8rem 1.6rem;border-radius:999px;cursor:pointer;box-shadow:var(--shadow)}
.listenPlayBtn:hover{filter:brightness(1.06)}
.listenOptions{display:grid;grid-template-columns:1fr 1fr;gap:.8rem;max-width:640px;margin:0 auto}
.listenOpt{background:var(--parchment);border:2px solid var(--gold-light);border-radius:12px;
  padding:.9rem 1rem;font-weight:600;color:var(--text);cursor:pointer;box-shadow:var(--shadow);transition:.15s}
.listenOpt.listenOpt-zh{font-family:'Noto Serif SC',serif;font-size:1.6rem;color:var(--mauve-deep)}
.listenOpt:hover:not(:disabled){border-color:var(--mauve)}
.listenOpt.correct{border-color:var(--green);background:#EAF6EC;color:var(--green)}
.listenOpt.wrong{border-color:var(--red);background:#FBEAEC;color:var(--red)}
.listenOpt:disabled{cursor:default}
.listenOptions.awaitingListen .listenOpt{opacity:.48;cursor:not-allowed;filter:saturate(.65)}
@media(max-width:520px){.listenOptions{grid-template-columns:1fr}}

/* ===================== LUYỆN VIẾT NÉT (HanziWriter — không tính vào thống kê) ===================== */
.swWordHead{text-align:center;margin-bottom:1rem}
.swHanzi{font-family:'Noto Serif SC',serif;font-size:1.8rem;font-weight:700;color:var(--mauve-deep)}
.swPinyin{font-size:1rem;color:var(--mauve-dark);margin-top:.2rem}
.swMeaning{font-size:.95rem;color:var(--text-soft);margin-top:.15rem}
.swStage{display:flex;flex-wrap:wrap;justify-content:center;gap:1rem;margin-bottom:1rem;min-height:236px}
.swCharBox{background:var(--parchment);border:1px solid var(--gold-light);border-radius:14px;
  box-shadow:var(--shadow);padding:.5rem;cursor:pointer;transition:.15s;position:relative}
.swCharBox:hover{border-color:var(--mauve);transform:translateY(-2px)}
.swCharBox::after{content:"▶";position:absolute;bottom:6px;right:8px;font-size:.7rem;color:var(--mauve);opacity:.55}
@media(max-width:480px){.swStage{min-height:190px}}
/* ---- 🖼️ Hình minh họa từng nét (lưới 米字格 tĩnh, đúng màu ảnh mẫu người dùng gửi) ---- */
.swImgBlock{max-width:820px;margin:0 auto 1rem;background:var(--lavender-1);border:1px solid var(--gold-light);
  border-radius:var(--radius);padding:1rem 1.2rem}
.swImgTitle{font-weight:700;color:var(--mauve-deep);font-size:1.27rem;text-align:center;margin-bottom:.6rem}
.swImgChar{margin-bottom:.8rem}
.swImgChar:last-child{margin-bottom:0}
.swImgChar b{font-family:'Noto Serif SC',serif;font-size:2.2rem;color:var(--mauve-deep);display:block;
  margin-bottom:.4rem;text-align:center}
.swImgRow{display:flex;flex-wrap:wrap;gap:.5rem;justify-content:center;align-items:center;min-height:92px}
.swImgBox{width:92px;height:92px;flex:0 0 auto;border-radius:8px;display:block}
.swImgLoading{font-size:.85rem;color:var(--text-soft);font-style:italic}
@media(max-width:480px){.swImgBox{width:72px;height:72px}.swImgRow{min-height:72px}}
.swInfo{max-width:820px;margin:0 auto;background:var(--lavender-1);border:1px solid var(--gold-light);
  border-radius:var(--radius);padding:1rem 1.2rem;text-align:left}
.swStrokeCount{font-weight:700;color:var(--mauve-deep);font-size:1.27rem;text-align:center;margin-bottom:.6rem}
.swRadical{font-size:1.2rem;color:var(--text-soft);line-height:1.6}
.swRadChar{margin-bottom:.6rem}
.swRadChar b{font-family:'Noto Serif SC',serif;font-size:2.2rem;color:var(--mauve-deep)}
.swRadKx{font-size:1.13rem;color:var(--mauve-dark);margin:.2rem 0 .4rem;font-weight:600}
.swRadAtomic{font-size:1.17rem;color:var(--text-soft);font-style:italic}
.swRadList{margin:.25rem 0 0 0;padding-left:1.2rem}
.swRadList li{margin-bottom:.35rem}
.swRadSym{font-family:'Noto Serif SC',serif;font-weight:700;color:var(--mauve-deep)}
.swRadName{font-weight:700;color:var(--mauve-dark)}
.swRadNone{font-style:italic;color:var(--text-soft)}
.swRadSubLabel{font-size:1.09rem;color:var(--text-soft);margin-top:.3rem;font-style:italic}
.swRadList2{margin:.2rem 0 0 0;padding-left:1.1rem;border-left:2px solid var(--gold-light)}
.swRadList2 li{margin-bottom:.2rem;font-size:1.23rem}
.swSeqBlock{max-width:820px;margin:0 auto 1rem;background:var(--lavender-1);border:1px solid var(--gold-light);
  border-radius:var(--radius);padding:1rem 1.2rem}
.swSeqTitle{font-weight:700;color:var(--mauve-deep);font-size:1.27rem;text-align:center;margin-bottom:.6rem}
.swSeqChar{margin-bottom:.55rem}
.swSeqChar b{font-family:'Noto Serif SC',serif;font-size:2.2rem;color:var(--mauve-deep);margin-right:.4rem;display:block;margin-bottom:.3rem}
.swSeqSteps{display:inline-flex;flex-wrap:wrap;gap:.4rem;margin-top:.3rem}
.swSeqStep{background:var(--parchment);border:1px solid var(--gold-light);border-radius:999px;
  padding:.35rem .9rem;font-size:1.09rem;color:var(--text)}
.swNote{text-align:center;font-size:.78rem;color:var(--text-soft);margin-top:.8rem;font-style:italic}

/* V166: chừa khoảng trống bên phải cho nút thông tin cá nhân, tránh đè lên ô Chọn bài */
#hskNav select:last-child{
  margin-right:58px;
}
@media(max-width:600px){
  #hskNav select:last-child{margin-right:52px;}
}


/* V206 — theo dõi tiến độ học */
.learningOverview{max-width:760px;margin:10px auto 24px;padding:9px 15px;border:1px solid #e4c987;border-radius:999px;background:rgba(255,252,244,.86);display:flex;justify-content:center;align-items:center;gap:16px;flex-wrap:wrap;color:#6b4e8c;font-size:.92rem;box-shadow:0 8px 24px rgba(82,55,103,.06)}
.learningOverview.complete{background:#eef8ef;border-color:#b9ddbd;color:#2f733a}.learningOverview .learningRule{font-size:.78rem;color:#8a7798}
.learningMasterRow{display:flex;justify-content:center;align-items:center;margin:10px 0 4px}.learningMasterBtn{border:1px solid #cbb7df;background:#fff;color:#6b4e8c;border-radius:999px;padding:8px 18px;font:inherit;font-weight:800;cursor:pointer;box-shadow:0 7px 20px rgba(83,54,107,.08);transition:.16s ease}.learningMasterBtn:hover{transform:translateY(-1px);background:#faf6ff}.learningMasterBtn.mastered{background:#eaf7ec;border-color:#9ed0a5;color:#2f7d3b}.learningMasterBtn.mastered::after{content:' · đã ghi nhận';font-weight:600;font-size:.78em;opacity:.82}
@media(max-width:700px){.learningOverview{border-radius:18px;gap:8px 12px;font-size:.84rem;margin-left:10px;margin-right:10px}.learningOverview .learningRule{width:100%;text-align:center}.learningMasterBtn{padding:7px 14px}}

/* ============================================================
   BÀI KHÓA — tab "📖 Bài khóa" mới: Bài khóa 1/2/3 × 6 phần
   (avatar+tên đầu câu hội thoại, nghe đồng bộ nổi bật câu, luyện dịch, đánh chính tả)
   ============================================================ */
.bkGroupTabBar,.bkPartTabBar{display:flex;justify-content:center;gap:.5rem;flex-wrap:wrap;margin:0 0 .9rem}
.bkTabBtn2{border:1.5px solid var(--mauve-dark);background:#fff;color:var(--mauve-deep);font-weight:800;font-size:.95rem;
  border-radius:999px;padding:.55rem 1.3rem;cursor:pointer;transition:.15s ease}
.bkTabBtn2.active{background:linear-gradient(135deg,var(--mauve),var(--mauve-dark));color:#fff;border-color:var(--mauve-dark)}
.bkTabBtn2:hover{background:var(--lavender-2)}.bkTabBtn2.active:hover{background:var(--mauve-dark)}
.bkTabBtn3{border:1.5px solid var(--mauve);background:#fff;color:var(--mauve-deep);font-weight:700;font-size:.85rem;
  border-radius:12px;padding:.5rem .9rem;cursor:pointer;text-align:center;transition:.15s ease}
.bkTabBtn3 small{display:block;font-size:.72rem;font-weight:600;color:var(--mauve);margin-top:.15rem}
/* V261 · Đổi màu active sang mauve/tím giống hệt .modeTabBtn.active (mode tab của Từ
   mới) và .tabBtn.active (sidebar Bài khóa 1/2/3) — trước đó dùng màu vàng gold riêng,
   người dùng yêu cầu thống nhất 1 màu active cho toàn bộ tab của phần Bài khóa. */
.bkTabBtn3.active{background:linear-gradient(135deg,var(--mauve),var(--mauve-dark));color:#fff;border-color:var(--mauve-dark)}
.bkTabBtn3.active small{color:#fff}
.bkTabBtn3:hover{background:var(--lavender-2)}
.bkTabBtn3.active:hover{background:var(--mauve-dark)}

/* Tab "① Nghe bài khóa" (gộp 3 phần nghe cũ) — 2 nút bật/tắt phiên âm + nghĩa */
.bkToggleRow{display:flex;justify-content:center;gap:.6rem;flex-wrap:wrap;margin:0 0 .9rem}
.bkToggleBtn{border:1.5px solid var(--gold);background:#fff;color:var(--mauve-deep);font-weight:700;
  font-size:.85rem;border-radius:999px;padding:.45rem 1rem;cursor:pointer;transition:.15s ease}
.bkToggleBtn.active{background:linear-gradient(135deg,var(--gold),#B98D3E);color:#fff;border-color:#B98D3E}
.bkToggleBtn:hover{background:var(--lavender-1)}.bkToggleBtn.active:hover{filter:brightness(1.05)}
.bkDlgWrap.hidePinyin .bkLinePy{display:none}
.bkDlgWrap.hideVi .bkLineVi{display:none}
/* V262 · Tên nhân vật (Pinyin · Hán tự · Tiếng Việt) ẩn/hiện theo đúng 2 nút toggle ở
   trên, giống hệt câu thoại — chỉ phần Hán tự (.bkSpNameZh) luôn hiện. */
.bkDlgWrap.hidePinyin .bkSpNamePy{display:none}
.bkDlgWrap.hideVi .bkSpNameVi{display:none}

.bkPlayer{background:var(--parchment);border:1px solid var(--gold-light);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:1rem 1.2rem;max-width:760px;margin:0 auto 1.2rem}
.bkPlayerRow{display:flex;align-items:center;gap:.6rem;flex-wrap:wrap;justify-content:center}
.bkPBtn{border:none;background:linear-gradient(135deg,var(--mauve-dark),var(--mauve-deep));color:#fff;
  font-weight:700;font-size:1rem;border-radius:999px;padding:.5rem .9rem;cursor:pointer}
.bkPBtn:hover{filter:brightness(1.08)}
.bkSeek{flex:1 1 140px;min-width:100px;accent-color:var(--mauve-dark)}
.bkTime{font-size:.82rem;color:var(--text-soft);white-space:nowrap}
.bkRate{border:1px solid var(--gold);border-radius:8px;padding:.3rem .4rem;font-size:.82rem;color:var(--mauve-deep);background:#fff}

.bkDlgWrap{max-width:760px;margin:0 auto;display:flex;flex-direction:column;gap:.8rem}
.bkDlgLine{display:flex;gap:.7rem;align-items:flex-start;padding:.5rem;border-radius:var(--radius);
  cursor:pointer;transition:background .2s ease,box-shadow .2s ease}
.bkDlgLine:hover{background:var(--lavender-1)}
.bkDlgLine.active{background:var(--lavender-2);box-shadow:0 0 0 2px var(--mauve) inset}
.bkAvatar{flex:0 0 auto;width:52px;height:52px}
.bkAvatarImg{width:52px;height:52px;border-radius:50%;object-fit:cover;border:2px solid var(--mauve);display:block}
.bkAvatarFallback{width:52px;height:52px;border-radius:50%;background:var(--lavender-2);border:2px solid var(--mauve);
  display:flex;align-items:center;justify-content:center;font-size:1.35rem}
.bkBubbleCol{flex:1 1 auto;min-width:0}
.bkSpeakerName{font-size:.8rem;font-weight:800;color:var(--mauve-dark);margin-bottom:.2rem}
.bkBubble{background:#fff;border:1px solid var(--gold-light);border-radius:14px;padding:.7rem .9rem}
.bkDlgLine.active .bkBubble{border-color:var(--mauve)}
.bkLineZh{font-family:'Noto Serif SC',serif;font-size:1.35rem;font-weight:700;color:var(--mauve-deep);line-height:1.5;transition:color .2s ease}
/* V261 · Câu đang được đọc (theo audio) — ngoài viền nổi bật (.bkDlgLine.active ở trên),
   chữ Hán cũng đổi sang màu đỏ (--red) để dễ nhận biết đúng câu đang phát. */
.bkDlgLine.active .bkLineZh{color:var(--red)}
.bkLinePy{margin-top:.25rem;font-size:1rem;color:var(--mauve-dark);font-weight:600}
.bkLineVi{margin-top:.2rem;font-size:.95rem;color:var(--text-soft)}

.bkTransBox,.bkDictBox{max-width:960px;margin:0 auto;padding:0 .2rem}
/* V266 · Chuẩn hóa bố cục luyện câu theo mẫu ô Điền từ: câu lớn, nét thường, hàng nhập cân đối. */
.bkTransBox .modeCounter,.bkDictBox .modeCounter{font-size:.92rem;margin-bottom:.7rem}
.bkTransBox .bkSpeakerName{font-size:.98rem;font-weight:700;text-align:left;margin:0 0 .35rem;color:var(--mauve-dark)}
.bkTransBox .fbSentence{
  min-height:152px;padding:1.65rem 2rem;display:flex;align-items:center;justify-content:center;
}
.bkTransPrompt{width:100%;text-align:center;color:var(--mauve-deep);font-weight:400}
.bkTransPromptZh{
  font-family:'Noto Serif SC',serif;font-size:2.55rem;line-height:1.55;font-weight:400;letter-spacing:.01em;
}
.bkTransPromptVi{font-family:inherit;font-size:1.62rem;line-height:1.65;font-weight:400;color:var(--text)}
.bkTransBox .fbInputRow,.bkDictBox .fbInputRow{
  display:grid;grid-template-columns:minmax(0,1fr) auto auto;gap:.65rem;width:100%;align-items:stretch;margin-top:1rem;
}
.bkSentenceInput{
  width:100%;min-width:0;max-width:none;min-height:48px;height:48px;overflow:hidden;resize:none;
  white-space:pre-wrap;overflow-wrap:anywhere;font-family:inherit;font-size:1.35rem;line-height:1.5;
  padding:.35rem 1rem;border-radius:12px;border:2px solid var(--gold);background:#fff;color:var(--text);
  text-align:left;outline:none;box-shadow:none;transition:border-color .15s ease,box-shadow .15s ease;
}
.bkSentenceInput::placeholder{color:#8d8990;opacity:.9}
.bkSentenceInput:focus{border-color:var(--mauve-dark);box-shadow:0 0 0 3px rgba(142,111,184,.12)}
.bkSentenceInput:disabled{opacity:.6;background:var(--lavender-1)}
.bkDictBox .fbFeedback{font-size:1.05rem;line-height:1.45;margin-top:.55rem;min-height:1.15rem}
.bkTransBox .fbInputRow button,.bkDictBox .fbInputRow button{
  min-width:140px;min-height:48px;padding:.45rem 1.15rem;font-size:1rem;border-radius:12px;white-space:nowrap;
}



/* V281 — Bài khóa ⑤ Nghe–nói lại · AI chấm phát âm */
.bkSpeakBox{max-width:960px;margin:0 auto;padding:0 .2rem}
.bkSpeakHead{display:flex;align-items:center;justify-content:space-between;gap:.8rem;flex-wrap:wrap;margin-bottom:.65rem}
.bkSpeakHead .modeCounter{margin:0}
.bkSpeakBest{font-size:.86rem;color:var(--text-soft)}
.bkSpeakSentence{background:var(--parchment);border:1px solid var(--gold-light);border-radius:18px;box-shadow:var(--shadow);padding:1.35rem 1.5rem;text-align:center}
.bkSpeakZh{font-family:'Noto Serif SC',serif;font-size:2.25rem;line-height:1.55;font-weight:400;color:var(--mauve-deep)}
.bkSpeakPy{margin-top:.35rem;font-size:1.02rem;line-height:1.5;color:var(--mauve-dark);font-weight:600}
.bkSpeakVi{margin-top:.28rem;font-size:.94rem;line-height:1.5;color:var(--text-soft)}
.bkSpeakSampleRow{display:flex;align-items:center;justify-content:center;gap:.65rem;flex-wrap:wrap;margin-top:1rem}
.bkSpeakSampleRow .bkPBtn:disabled{opacity:.45;cursor:default;filter:none}
.bkSpeakInstruction{text-align:center;margin:.85rem auto .65rem;color:var(--text-soft);font-size:.9rem;line-height:1.5}
.bkSpeakControls{display:flex;justify-content:center;gap:.65rem;flex-wrap:wrap}
.bkSpeakAction{border:1.5px solid var(--mauve);background:#fff;color:var(--mauve-deep);font:inherit;font-weight:800;border-radius:12px;min-height:48px;padding:.55rem 1rem;cursor:pointer;transition:.15s ease}
.bkSpeakAction:hover:not(:disabled){background:var(--lavender-2);transform:translateY(-1px)}
.bkSpeakAction.record,.bkSpeakAction.grade{background:linear-gradient(135deg,var(--mauve),var(--mauve-dark));color:#fff;border-color:var(--mauve-dark)}
.bkSpeakAction.recording{background:var(--red);border-color:var(--red);color:#fff}
.bkSpeakAction.secondary{border-color:var(--gold);background:#fff}
.bkSpeakAction:disabled{opacity:.42;cursor:default;transform:none}
.bkSpeakRecordStatus{text-align:center;min-height:1.4rem;margin-top:.7rem;font-size:.92rem;color:var(--text-soft);font-weight:600}
.bkSpeakResult{margin-top:.8rem}
.bkSpeakGrading,.bkSpeakError{text-align:center;font-weight:800;line-height:1.5;padding:.8rem;border-radius:12px;background:var(--lavender-1);color:var(--mauve-deep)}
.bkSpeakError{color:var(--red)}
.bkSpeakScore{display:flex;align-items:center;justify-content:center;gap:.7rem;flex-wrap:wrap;border:1px solid var(--gold-light);background:#fff;border-radius:16px;padding:.8rem 1rem;text-align:center}
.bkSpeakScore span{font-size:.9rem;color:var(--text-soft)}
.bkSpeakScore strong{font-size:1.8rem;color:var(--mauve-deep)}
.bkSpeakScore b{font-size:1rem}
.bkSpeakScore.pass{border-color:#a8d7af;background:#f2fbf3}.bkSpeakScore.pass b{color:var(--green)}
.bkSpeakScore.retry{border-color:#e7b5b8;background:#fff7f7}.bkSpeakScore.retry b{color:var(--red)}
.bkSpeakMetrics{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:.5rem;margin-top:.65rem}
.bkSpeakMetrics span{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.1rem;background:#fff;border:1px solid var(--gold-light);border-radius:12px;padding:.55rem .35rem;text-align:center}
.bkSpeakMetrics b{font-size:.72rem;color:var(--text-soft);font-weight:700}.bkSpeakMetrics em{font-style:normal;font-size:1.05rem;font-weight:900;color:var(--mauve-deep)}
.bkSpeakHeard,.bkSpeakFeedbackText{margin-top:.65rem;background:#fff;border:1px solid var(--gold-light);border-radius:12px;padding:.7rem .85rem;line-height:1.55;color:var(--text)}
.bkSpeakHeard{font-family:'Noto Serif SC','Noto Serif',serif;font-size:1.05rem}.bkSpeakHeard b{font-family:'Noto Serif','Noto Serif SC',serif;color:var(--mauve-deep)}
.bkSpeakFeedbackText{color:var(--mauve-deep);font-weight:700}
.bkSpeakProblems{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.55rem;margin-top:.65rem}
.bkSpeakProblem{display:flex;flex-direction:column;gap:.18rem;background:#fff;border:1px solid var(--gold-light);border-radius:12px;padding:.7rem .8rem;line-height:1.45}
.bkSpeakProblem b{font-family:'Noto Serif SC',serif;color:var(--red);font-size:1.05rem}.bkSpeakProblem span{font-size:.86rem;color:var(--text)}.bkSpeakProblem small{font-size:.82rem;color:var(--mauve-dark)}
.bkSpeakPassRule{text-align:center;margin-top:.65rem;color:var(--text-soft);font-size:.82rem}
@media(max-width:700px){
  .bkSpeakBox{padding:0}.bkSpeakSentence{padding:1rem .75rem}.bkSpeakZh{font-size:1.75rem}.bkSpeakPy{font-size:.92rem}.bkSpeakVi{font-size:.86rem}
  .bkSpeakControls{display:grid;grid-template-columns:1fr 1fr;gap:.5rem}.bkSpeakAction{width:100%;min-width:0;padding:.5rem .45rem;font-size:.84rem}
  .bkSpeakMetrics{grid-template-columns:repeat(2,minmax(0,1fr))}.bkSpeakMetrics span:last-child{grid-column:1/-1}
  .bkSpeakProblems{grid-template-columns:1fr}.bkSpeakHead{justify-content:center;text-align:center}
}

/* Từng chữ Hán được tra riêng; riêng tên người/tên riêng đã nhận diện được gom thành một cụm. */
.bkLookupSentence{cursor:default}
.bkLookupChar{
  appearance:none;-webkit-appearance:none;border:0;background:transparent;color:inherit;font:inherit;font-weight:400;
  display:inline;padding:.02em .035em;margin:0;border-radius:.2em;line-height:inherit;vertical-align:baseline;
  cursor:pointer;transition:background .12s ease,color .12s ease,transform .12s ease;
}
.bkLookupPhrase{white-space:nowrap}
.bkLookupChar:hover,.bkLookupChar:focus-visible{background:var(--lavender-2);color:var(--red);outline:none;transform:translateY(-1px)}
.bkCharMeaningPopup{
  position:fixed;z-index:3000;display:none;width:max-content;max-width:min(320px,calc(100vw - 20px));
  background:#fff;border:1.5px solid var(--gold);border-radius:12px;padding:.72rem 2rem .72rem .85rem;
  box-shadow:0 12px 34px rgba(74,59,99,.24);color:var(--text);text-align:left;
}
.bkCharMeaningPopup.show{display:block}
.bkCharPopupChar{font-family:'Noto Serif SC',serif;font-size:1.7rem;font-weight:600;color:var(--mauve-deep);line-height:1.2}
.bkCharPopupMeaning{margin-top:.28rem;font-size:.92rem;line-height:1.5;color:var(--text-soft)}
.bkCharPopupClose{position:absolute;top:.24rem;right:.38rem;border:0;background:transparent;color:var(--text-soft);font-size:1.2rem;cursor:pointer;padding:.1rem .25rem}
.bkCharPopupClose:hover{color:var(--red)}

.bkDiffLine{text-align:center;font-family:'Noto Serif SC',serif;font-size:1.55rem;margin-top:.55rem;line-height:1.65}
.diffSame{color:var(--green)}
.diffMissing{color:var(--red);text-decoration:none;opacity:.9}
.diffExtra{color:var(--red);text-decoration:line-through}

@media(max-width:700px){
  .bkTabBtn3{font-size:.78rem;padding:.45rem .6rem}
  .bkLineZh{font-size:1.2rem}
  .bkTransBox,.bkDictBox{padding:0}
  .bkTransBox .fbSentence{min-height:124px;padding:1.3rem 1rem}
  .bkTransPromptZh{font-size:2rem;line-height:1.55}
  .bkTransPromptVi{font-size:1.3rem;line-height:1.6}
  .bkTransBox .fbInputRow,.bkDictBox .fbInputRow{grid-template-columns:1fr 1fr;gap:.55rem}
  .bkSentenceInput{grid-column:1/-1;width:100%;min-width:0;max-width:100%;font-size:1.12rem;min-height:48px;height:48px}
  .bkTransBox .fbInputRow button,.bkDictBox .fbInputRow button{min-width:0;width:100%;min-height:52px;font-size:.9rem;padding:.55rem .65rem}
  .bkAvatarImg,.bkAvatarFallback,.bkAvatar{width:42px;height:42px}
}


/* V267 — thanh điều hướng HSK: hiển thị rõ khung chương trình, dàn đều toàn chiều ngang */
#hskNav{
  width:100%;
  box-sizing:border-box;
  flex-wrap:nowrap;
  justify-content:space-between;
  gap:clamp(.38rem,.75vw,.8rem);
  padding-left:clamp(.65rem,1.25vw,1.2rem);
  padding-right:72px;
}
#hskNav .hskFrameworkBadge{
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:35px;
  padding:.3rem .7rem;
  border:1px solid var(--gold-light);
  border-radius:8px;
  background:rgba(255,252,244,.86);
  color:var(--mauve-deep);
  font-size:.8rem;
  font-weight:800;
  white-space:nowrap;
  box-shadow:0 2px 8px rgba(107,78,140,.07);
}
#hskNav .hskLevelSel{
  flex:1 1 250px;
  min-width:180px;
  max-width:365px;
}
#hskNav .ttl{
  flex:1 1 230px;
  min-width:150px;
  margin-right:0;
  text-align:center;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}
#hskNav select:last-child{
  flex:1 1 235px;
  min-width:175px;
  max-width:330px;
  margin-right:0!important;
}
#hskNav > a{flex:0 0 auto}
@media(max-width:1050px){
  #hskNav{flex-wrap:wrap;padding-right:66px}
  #hskNav .hskLevelSel{flex:1 1 260px;max-width:none}
  #hskNav .ttl{order:8;flex:1 1 48%;text-align:left}
  #hskNav select:last-child{order:9;flex:1 1 42%;max-width:none}
}
@media(max-width:640px){
  #hskNav{gap:.4rem;padding:.5rem 54px .5rem .55rem}
  #hskNav .hskFrameworkBadge{min-height:33px;padding:.26rem .55rem;font-size:.75rem}
  #hskNav .hskLevelSel{flex:1 1 170px;min-width:145px}
  #hskNav .ttl{order:8;width:auto;flex:1 1 100%;margin-bottom:0;text-align:center}
  #hskNav select:last-child{order:9;flex:1 1 100%;min-width:0;max-width:none}
}
/* V268 — cây tab trái: phân cấp rõ, chỉ hiện tab con của mục lớn đang mở */
.tabBar{
  gap:.65rem;
}
.tabGroup{
  position:relative;
  gap:.34rem;
}
.tabGroupHead,
.tabBar > .tabBtn[data-tab="workbook"],
.tabBar > .tabBtn[data-tab="luyentap"]{
  position:relative;
  width:100%;
  min-height:54px;
  box-sizing:border-box;
  border-radius:18px;
  border:1.5px solid var(--gold-light);
  background:rgba(255,255,255,.94);
  color:var(--mauve-deep);
  padding:.66rem 2.25rem .66rem 1rem;
  text-align:left;
  font-size:1rem;
  font-weight:800;
  line-height:1.25;
  box-shadow:0 5px 16px rgba(107,78,140,.10);
}
.tabGroupHead small,
.tabBar > .tabBtn[data-tab="workbook"] small,
.tabBar > .tabBtn[data-tab="luyentap"] small{
  display:block;
  margin-top:.12rem;
  font-size:.74rem;
  font-weight:650;
  color:var(--mauve);
}
.tabGroupHead::after{
  content:"›";
  position:absolute;
  right:1rem;
  top:50%;
  transform:translateY(-50%);
  font-size:1.35rem;
  line-height:1;
  color:var(--mauve);
}
.tabGroup.expanded > .tabGroupHead::after{
  content:"⌄";
  transform:translateY(-55%);
}
.tabGroupHead.active,
.tabBar > .tabBtn[data-tab="workbook"].active,
.tabBar > .tabBtn[data-tab="luyentap"].active{
  background:linear-gradient(135deg,var(--mauve),var(--mauve-dark));
  color:#fff;
  border-color:var(--mauve-dark);
}
.tabGroupHead.active small,
.tabBar > .tabBtn[data-tab="workbook"].active small,
.tabBar > .tabBtn[data-tab="luyentap"].active small,
.tabGroupHead.active::after{
  color:#fff;
}
.tabGroup:not(.expanded) > .tabBtn{
  display:none!important;
}
.tabGroup.expanded::before{
  content:"";
  position:absolute;
  left:11px;
  top:59px;
  bottom:10px;
  width:2px;
  border-radius:2px;
  background:linear-gradient(180deg,rgba(203,165,92,.75),rgba(183,159,212,.45));
}
.tabGroup .tabBtn{
  position:relative;
  display:block;
  margin-left:24px!important;
  width:calc(100% - 24px)!important;
  min-height:46px;
  box-sizing:border-box;
  border-radius:14px;
  border:1px solid rgba(203,165,92,.58);
  background:rgba(255,255,255,.88);
  color:var(--mauve-deep);
  padding:.52rem .7rem .52rem 2rem!important;
  text-align:left!important;
  font-size:.9rem!important;
  font-weight:700!important;
  line-height:1.2;
  box-shadow:0 3px 10px rgba(107,78,140,.07);
}
.tabGroup .tabBtn::before{
  content:"↳";
  position:absolute;
  left:.7rem;
  top:50%;
  transform:translateY(-50%);
  color:var(--gold);
  font-size:.95rem;
  font-weight:900;
}
.tabGroup .tabBtn small{
  display:block;
  margin-top:.08rem;
  font-size:.7rem!important;
  font-weight:600!important;
  color:var(--mauve);
}
.tabGroup .tabBtn.active{
  background:linear-gradient(135deg,#9d82c4,var(--mauve-dark));
  color:#fff;
  border-color:var(--mauve-dark);
  box-shadow:0 5px 14px rgba(107,78,140,.16);
}
.tabGroup .tabBtn.active::before,
.tabGroup .tabBtn.active small{
  color:#fff;
}
.tabBar > .tabBtn[data-tab="workbook"],
.tabBar > .tabBtn[data-tab="luyentap"]{
  margin:0;
  cursor:pointer;
}
.subTabBar:not(.subtabDim){
  position:relative;
  box-sizing:border-box;
  padding-left:24px;
  gap:.34rem;
}
.subTabBar:not(.subtabDim)::before{
  content:"";
  position:absolute;
  left:11px;
  top:4px;
  bottom:10px;
  width:2px;
  border-radius:2px;
  background:linear-gradient(180deg,rgba(203,165,92,.75),rgba(183,159,212,.45));
}
.subTabBtn{
  position:relative;
  margin-left:0!important;
  width:100%!important;
  min-height:46px;
  border-radius:14px;
  padding:.52rem .7rem .52rem 2rem!important;
  text-align:left!important;
  font-size:.9rem;
  font-weight:700;
  box-shadow:0 3px 10px rgba(107,78,140,.07);
}
.subTabBtn::before{
  content:"↳";
  position:absolute;
  left:.7rem;
  top:50%;
  transform:translateY(-50%);
  color:var(--gold);
  font-weight:900;
}
.subTabBtn.active::before{color:#fff}
.subTabBtn small{
  margin-top:.08rem;
  font-size:.7rem!important;
  font-weight:600!important;
}
@media(min-width:900px){
  .tabBar{width:214px!important;gap:.65rem!important}
  .subTabBar:not(.subtabDim){
    left:44px!important;
    width:190px!important;
    padding-left:12px;
  }
  .subTabBar:not(.subtabDim)::before{left:0}
}
@media(max-width:899px){
  .tabBar{align-items:stretch}
  .tabGroup,
  .tabBar > .tabBtn[data-tab="workbook"],
  .tabBar > .tabBtn[data-tab="luyentap"]{
    max-width:520px;
    margin-left:auto;
    margin-right:auto;
  }
  .subTabBar:not(.subtabDim){max-width:496px;margin-left:auto;margin-right:auto}
}


/* V269 — sửa font Việt ở cây tab + cho thanh đầu trang phủ toàn viewport trên desktop */
button,input,select,textarea{font-family:inherit}
.tabGroupHead,
.tabBtn,
.subTabBtn,
.modeTabBtn,
.tabGroupHead small,
.tabBtn small,
.subTabBtn small,
.modeTabBtn small{
  font-family:'Noto Serif','Noto Serif SC','Noto Serif CJK SC','Segoe UI',system-ui,sans-serif!important;
  font-synthesis:none;
}
@media(min-width:900px){
  #hskNav{
    margin-left:-230px;
    width:calc(100% + 230px);
  }
}


/* V270 — sidebar gọn hơn, không đè nội dung; nhãn Việt/Hán cân giữa và đồng cỡ */
.sidebarIcon{position:absolute;left:.72rem;top:50%;transform:translateY(-50%);width:1.15rem;text-align:center;font-size:.95rem;line-height:1}
.sidebarText{display:flex;flex-direction:column;align-items:center;justify-content:center;width:100%;min-width:0;text-align:center;line-height:1.12}
.sidebarVi{display:block;font-size:.92rem;font-weight:800;line-height:1.18}
.sidebarZh{display:block!important;margin:.08rem 0 0!important;font-family:'Noto Serif SC','Noto Serif CJK SC','Noto Serif',serif!important;font-size:.88rem!important;font-weight:650!important;line-height:1.12!important;text-align:center;color:var(--mauve)}
.tabGroupHead.active .sidebarZh,.tabBar > .tabBtn.active .sidebarZh,.subTabBtn.active .sidebarZh{color:#fff}
.tabGroupHead,.tabBar > .tabBtn[data-tab="workbook"],.tabBar > .tabBtn[data-tab="luyentap"]{min-height:48px!important;padding:.5rem 1.8rem .5rem 1.8rem!important;border-radius:16px!important;text-align:center!important;font-size:.92rem!important}
.tabGroupHead::after{right:.72rem!important;font-size:1.15rem!important}
.tabGroup{gap:.28rem!important}.tabBar{gap:.48rem!important}
.tabGroup.expanded::before{top:51px!important;left:8px!important}
.tabGroup .tabBtn{margin-left:17px!important;width:calc(100% - 17px)!important;min-height:42px!important;padding:.42rem .55rem .42rem 1.55rem!important;border-radius:13px!important;text-align:center!important;font-size:.84rem!important}
.tabGroup .tabBtn::before{left:.5rem!important;font-size:.82rem!important}
.tabGroup .tabBtn > span{display:block;text-align:center;font-size:.86rem;line-height:1.15}
.tabGroup .tabBtn small{display:block!important;margin:.06rem 0 0!important;text-align:center!important;font-family:'Noto Serif SC','Noto Serif CJK SC','Noto Serif',serif!important;font-size:.82rem!important;font-weight:600!important;line-height:1.12!important}
.tabBar > .subTabBar{position:relative!important;left:auto!important;top:auto!important;width:100%!important;margin:0!important;padding:0 0 0 17px!important;display:flex;flex-direction:column;align-items:stretch;gap:.28rem!important;box-sizing:border-box}
.tabBar > .subTabBar.subtabDim{display:none!important}
.tabBar > .subTabBar:not(.subtabDim)::before{left:8px!important;top:0!important;bottom:8px!important}
.tabBar > .subTabBar .subTabBtn{min-height:42px!important;margin:0!important;width:100%!important;padding:.42rem .55rem .42rem 1.55rem!important;border-radius:13px!important;text-align:center!important;font-size:.84rem!important}
.tabBar > .subTabBar .subTabBtn::before{left:.5rem!important;font-size:.82rem!important}
.tabBar > .subTabBar .sidebarVi{font-size:.86rem}
.tabBar > .subTabBar .sidebarZh{font-size:.82rem!important}
@media(min-width:900px){body{padding-left:210px!important}.tabBar{left:12px!important;top:94px!important;width:184px!important;padding:0!important;gap:.48rem!important}#hskNav{margin-left:-210px!important;width:calc(100% + 210px)!important}}
@media(max-width:899px){.tabBar{padding:.65rem .7rem!important}.tabGroup,.tabBar > .tabBtn[data-tab="workbook"],.tabBar > .tabBtn[data-tab="luyentap"],.tabBar > .subTabBar{max-width:460px!important;margin-left:auto!important;margin-right:auto!important}}


/* V271 — luôn hiển thị toàn bộ tab con để cây sidebar cân đối theo chiều dọc */
.tabGroup > .tabBtn{display:block!important}
.tabGroupHead::after{display:none!important}
.tabBar > .subTabBar.subtabDim{display:flex!important}
@media(min-width:900px){
  .tabBar{top:108px!important;gap:.54rem!important}
}

/* V274 — mọi phần “đánh chữ” dùng cùng cơ chế với Nghe–đánh chữ Hán:
   ô nhập chiếm khoảng 2/3 hàng, tự tăng CHIỀU CAO khi câu dài, không kéo ngang. */
.typingInputRow{
  display:grid!important;
  grid-template-columns:minmax(0,2fr) minmax(140px,.46fr) minmax(140px,.46fr)!important;
  gap:.65rem!important;
  width:min(100%,1160px)!important;
  margin:1rem auto 0!important;
  align-items:stretch!important;
}
.typingSentenceInput{
  box-sizing:border-box!important;
  width:100%!important;
  min-width:0!important;
  max-width:none!important;
  min-height:64px!important;
  height:64px;
  overflow:hidden!important;
  resize:none!important;
  white-space:pre-wrap!important;
  overflow-wrap:anywhere!important;
  padding:.72rem 1rem!important;
  border:2px solid var(--gold)!important;
  border-radius:12px!important;
  background:#fff!important;
  color:var(--text)!important;
  font-family:inherit!important;
  font-size:1.3rem!important;
  line-height:1.5!important;
  text-align:left!important;
  outline:none!important;
  box-shadow:none!important;
}
.typingSentenceInput:focus{
  border-color:var(--mauve-dark)!important;
  box-shadow:0 0 0 3px rgba(142,111,184,.12)!important;
}
.typingSentenceInput:disabled{opacity:.6;background:var(--lavender-1)!important}
.typingInputRow button{
  min-width:140px!important;
  min-height:64px!important;
  height:auto!important;
  padding:.65rem 1rem!important;
  border-radius:12px!important;
  font-size:1rem!important;
  white-space:nowrap!important;
}
@media(max-width:700px){
  .typingInputRow{
    grid-template-columns:1fr 1fr!important;
    gap:.55rem!important;
    width:100%!important;
  }
  .typingSentenceInput{
    grid-column:1/-1!important;
    min-height:58px!important;
    height:58px;
    font-size:1.12rem!important;
  }
  .typingInputRow button{
    min-width:0!important;
    width:100%!important;
    min-height:52px!important;
    font-size:.9rem!important;
  }
}


/* V273 — căn toàn bộ cây tab trái theo tâm dọc của viewport; tránh dồn lên phía trên */
@media(min-width:900px){
  .tabBar{
    top:50%!important;
    transform:translateY(-50%);
    max-height:calc(100vh - 160px);
    overflow-y:auto;
    overflow-x:hidden;
    scrollbar-width:thin;
    padding-right:2px!important;
  }
}



/* V275 — mọi bài luyện gõ dùng chung bố cục “Kiểm tra / Đánh lại / đáp án màu / Câu trước–Câu sau”. */
.typingInputRow{
  grid-template-columns:minmax(0,2fr) minmax(132px,.5fr) minmax(132px,.5fr)!important;
  width:min(100%,1120px)!important;
}
.typingDiffLine{
  min-height:1.2rem;margin:.6rem auto 0;text-align:center;font-family:'Noto Serif SC','Noto Serif',serif;
  font-size:1.55rem;line-height:1.65;max-width:1120px;overflow-wrap:anywhere;
}
.typingRowNav{margin-top:.6rem!important}
.typingRowNav button{min-width:118px}
.bkTransBox,.bkDictBox{max-width:1120px!important}
.bkTransBox .fbInputRow,.bkDictBox .fbInputRow{
  grid-template-columns:minmax(0,2fr) minmax(132px,.5fr) minmax(132px,.5fr)!important;
  width:min(100%,1120px)!important;margin:1rem auto 0!important;
}
.bkTransBox .bkSentenceInput,.bkDictBox .bkSentenceInput{width:100%!important;max-width:none!important}
@media(max-width:700px){
  .typingInputRow,.bkTransBox .fbInputRow,.bkDictBox .fbInputRow{grid-template-columns:1fr 1fr!important;width:100%!important}
  .typingSentenceInput,.bkTransBox .bkSentenceInput,.bkDictBox .bkSentenceInput{grid-column:1/-1!important}
  .typingDiffLine{font-size:1.35rem}
}


/* Chấm nói nghiêm: ẩn câu mẫu trước khi chấm, hiển thị lỗi theo từng âm tiết sau khi chấm. */
.bkSpeakBlindPrompt{
  max-width:760px;margin:.35rem auto 0;padding:1.2rem 1rem;text-align:center;
  border:1px dashed var(--gold-light);border-radius:16px;background:rgba(255,255,255,.58);
  color:var(--mauve-deep);font-size:1rem;font-weight:750;line-height:1.55;
}
.bkSpeakReveal{
  margin:0 0 .75rem;background:var(--parchment);border:1px solid var(--gold-light);border-radius:18px;
  box-shadow:var(--shadow);padding:1.1rem 1.25rem;text-align:center;
}
.bkSpeakRevealLabel{
  display:inline-block;margin-bottom:.3rem;padding:.18rem .6rem;border-radius:999px;
  background:var(--lavender-2);color:var(--mauve-deep);font-size:.78rem;font-weight:850;
}
.bkSpeakErrorRatio{
  margin-top:.65rem;padding:.55rem .75rem;text-align:center;border:1px solid var(--gold-light);border-radius:12px;
  background:#fff;color:var(--text-soft);font-size:.86rem;line-height:1.5;
}
.bkSpeakErrorRatio b{color:var(--mauve-deep)}
.bkSpeakTranscript{
  margin-top:.35rem;font-family:'Noto Serif SC','Noto Serif',serif;font-size:1.35rem;line-height:1.7;
  overflow-wrap:anywhere;
}
.bkSpeakTranscriptOk{color:var(--green);font-weight:750}
.bkSpeakTranscriptBad,.bkSpeakTranscriptMissing{
  color:var(--red);font-weight:850;background:rgba(199,85,89,.09);border-radius:5px;padding:0 .08em;
}
.bkSpeakRecognizedPy{margin-top:.2rem;color:var(--text-soft);font-size:.9rem}
.bkSpeakExtra{margin-top:.3rem;color:var(--red);font-size:.88rem;font-weight:700}
.bkSpeakSyllableTitle{
  display:flex;align-items:baseline;justify-content:space-between;gap:.7rem;flex-wrap:wrap;
  margin:.8rem 0 .45rem;color:var(--mauve-deep);font-weight:900;font-size:1rem;
}
.bkSpeakSyllableTitle small{font-size:.76rem;font-weight:650;color:var(--text-soft)}
.bkSpeakSyllables{
  display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.6rem;
}
.bkSpeakSyllable{
  background:#fff;border:1.5px solid var(--gold-light);border-radius:14px;padding:.7rem .75rem;
  box-shadow:0 4px 14px rgba(80,50,105,.05);
}
.bkSpeakSyllable.good{border-color:#a9d9b0;background:#f6fcf7}
.bkSpeakSyllable.bad{border-color:#e3aeb2;background:#fffafa}
.bkSpeakSyllableTop{
  display:flex;align-items:center;gap:.4rem;flex-wrap:wrap;padding-bottom:.45rem;margin-bottom:.45rem;
  border-bottom:1px solid rgba(126,89,159,.12);
}
.bkSpeakSyllableTop strong{
  font-family:'Noto Serif SC','Noto Serif',serif;font-size:1.65rem;color:var(--mauve-deep);font-weight:650;
}
.bkSpeakSyllableTop span,.bkSpeakSyllableTop em{font-style:normal;font-size:.9rem;font-weight:750;color:var(--text-soft)}
.bkSpeakSyllableTop i{font-style:normal;color:var(--mauve)}
.bkSpeakSyllable.bad .bkSpeakSyllableTop em{color:var(--red)}
.bkSpeakPhoneme{
  display:grid;grid-template-columns:78px minmax(35px,auto) 18px minmax(35px,auto) 58px;
  align-items:center;gap:.3rem;margin:.25rem 0;padding:.32rem .4rem;border-radius:8px;font-size:.82rem;
}
.bkSpeakPhoneme span{color:var(--text-soft);font-weight:700}
.bkSpeakPhoneme code{font-family:inherit;font-size:.9rem;font-weight:850;text-align:center;color:var(--text)}
.bkSpeakPhoneme i{font-style:normal;text-align:center;color:var(--text-soft)}
.bkSpeakPhoneme b{text-align:right;font-size:.78rem}
.bkSpeakPhoneme.correct{background:#f0faf2}.bkSpeakPhoneme.correct b{color:var(--green)}
.bkSpeakPhoneme.incorrect,.bkSpeakPhoneme.omitted{background:#fff0f1}.bkSpeakPhoneme.incorrect b,.bkSpeakPhoneme.omitted b{color:var(--red)}
.bkSpeakPhoneme.unclear{background:#fff9e9}.bkSpeakPhoneme.unclear b{color:#a77416}
.bkSpeakPhoneme.incorrect code:last-of-type,.bkSpeakPhoneme.omitted code:last-of-type{color:var(--red)}
.bkSpeakSyllableIssue{
  margin-top:.42rem;padding:.45rem .5rem;border-radius:8px;background:rgba(199,85,89,.07);
  color:var(--red);font-size:.82rem;font-weight:750;line-height:1.45;
}
@media(max-width:700px){
  .bkSpeakBlindPrompt{padding:.9rem .7rem;font-size:.9rem}
  .bkSpeakReveal{padding:.9rem .7rem}.bkSpeakReveal .bkSpeakZh{font-size:1.7rem}
  .bkSpeakTranscript{font-size:1.16rem}
  .bkSpeakSyllables{grid-template-columns:1fr}
  .bkSpeakPhoneme{grid-template-columns:70px minmax(32px,auto) 16px minmax(32px,auto) 54px;font-size:.78rem}
}
.bkSpeakPronunciationLine{
  display:flex;align-items:center;gap:.6rem;flex-wrap:wrap;margin-top:.45rem;padding-top:.45rem;
  border-top:1px solid rgba(126,89,159,.12);
}
.bkSpeakPronunciationLine > span{font-family:'Noto Serif','Noto Serif SC',serif;font-size:.82rem;font-weight:800;color:var(--mauve-deep)}
.bkSpeakPronunciationLine > div{display:flex;align-items:center;gap:.12rem;flex-wrap:wrap}
.bkSpeakPronToken{
  display:inline-flex;align-items:center;justify-content:center;min-width:1.55em;padding:.05em .14em;border-radius:5px;
  font-family:'Noto Serif SC','Noto Serif',serif;font-size:1.35rem;font-weight:750;
}
.bkSpeakPronToken.good{color:var(--green);background:#f0faf2}
.bkSpeakPronToken.bad{color:var(--red);background:#fff0f1;text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:3px}
.bkSpeakPronToken.unclear{color:#a77416;background:#fff9e9;text-decoration:underline dotted;text-underline-offset:3px}

/* Speaking v3: blind acoustic evidence + explicit correction guidance */
.bkSpeakAcousticLine{display:flex;flex-wrap:wrap;gap:.35rem;align-items:center;margin:.35rem 0 .45rem;font-size:1rem}
.bkSpeakSemanticNote{margin-top:.35rem;padding-top:.35rem;border-top:1px dashed rgba(132,92,166,.22);color:var(--text-soft);font-size:.84rem}
.bkSpeakSemanticNote>span{font-weight:700;color:var(--mauve-dark)}
.bkSpeakSemanticNote .bkSpeakTranscript{display:inline;margin-left:.25rem}
.bkSpeakSyllableTip{margin-top:.45rem;padding:.48rem .58rem;border-radius:10px;background:rgba(244,232,255,.52);color:var(--mauve-dark);font-size:.86rem;line-height:1.5}
.bkSpeakProblems{margin-top:.7rem}
.bkSpeakProblem small{line-height:1.5}


/* V276 · Luyện nói toàn bài khóa — một bản ghi duy nhất cho toàn bộ Bài khóa hiện tại. */
.bkWholeSpeakBox{max-width:1040px}
.bkWholeSpeakMeta{
  display:flex;justify-content:center;gap:.75rem 1.2rem;flex-wrap:wrap;margin:.7rem auto .15rem;
  color:var(--text-soft);font-size:.86rem;text-align:center
}
.bkWholeSpeakMeta span{
  display:inline-flex;align-items:center;gap:.25rem;padding:.35rem .65rem;border-radius:999px;
  background:rgba(255,255,255,.62);border:1px solid rgba(190,157,222,.48)
}
.bkWholeSpeakMeta b{color:var(--mauve-deep)}
.bkWholeSpeakRecognized{margin-top:.75rem}
.bkWholeSpeakLines{display:grid;grid-template-columns:1fr;gap:.65rem;margin-top:.45rem}
.bkWholeSpeakLine{
  background:#fff;border:1.5px solid var(--gold-light);border-radius:15px;padding:.8rem .9rem;
  box-shadow:0 4px 14px rgba(80,50,105,.05)
}
.bkWholeSpeakLine.good{border-color:#a9d9b0;background:#f7fcf8}
.bkWholeSpeakLine.needs_work{border-color:#e7c878;background:#fffdf5}
.bkWholeSpeakLine.missing{border-color:#e3aeb2;background:#fffafa}
.bkWholeSpeakLineHead{display:flex;align-items:center;justify-content:space-between;gap:.7rem;margin-bottom:.3rem}
.bkWholeSpeakLineHead b{color:var(--mauve-deep);font-size:.88rem}
.bkWholeSpeakLineHead span{font-size:.76rem;font-weight:850;border-radius:999px;padding:.18rem .55rem;background:var(--lavender-2);color:var(--mauve-deep)}
.bkWholeSpeakLine.good .bkWholeSpeakLineHead span{background:#eaf7ed;color:#397847}
.bkWholeSpeakLine.needs_work .bkWholeSpeakLineHead span{background:#fff4d7;color:#956614}
.bkWholeSpeakLine.missing .bkWholeSpeakLineHead span{background:#fdebed;color:#a43f48}
.bkWholeSpeakZh{font-family:'Noto Serif SC','Noto Serif',serif;font-size:1.28rem;line-height:1.6;color:var(--text)}
.bkWholeSpeakPy{margin-top:.1rem;color:var(--mauve-deep);font-size:.88rem;line-height:1.55}
.bkWholeSpeakVi{margin-top:.08rem;color:var(--text-soft);font-size:.84rem;line-height:1.5}
.bkWholeSpeakHeard,.bkWholeSpeakIssue,.bkWholeSpeakTip{margin-top:.42rem;padding-top:.38rem;border-top:1px dashed rgba(132,92,166,.18);font-size:.83rem;line-height:1.5}
.bkWholeSpeakHeard{color:var(--text-soft)}
.bkWholeSpeakHeard b{color:var(--mauve-deep)}
.bkWholeSpeakIssue{color:#a77416;font-weight:700}
.bkWholeSpeakLine.missing .bkWholeSpeakIssue{color:var(--red)}
.bkWholeSpeakTip{color:var(--mauve-dark)}
@media(max-width:700px){
  .bkWholeSpeakMeta{gap:.4rem;font-size:.8rem}.bkWholeSpeakMeta span{width:100%;justify-content:center}
  .bkWholeSpeakLine{padding:.72rem .68rem}.bkWholeSpeakZh{font-size:1.15rem}
}

/* V284 — QUY CÁCH CHUNG CHO MỌI Ô GÕ CÂU.
   Mặc định khung gọn; JS chỉ nở ngang khi câu nhập dài hơn khung hiện tại.
   Khi đạt chiều rộng tối đa thì mới xuống dòng/tăng chiều cao.
   Dùng chung cho Điền từ, Sắp xếp câu, Viết chữ, dịch, nghe-đánh chữ, trả lời câu hỏi và dạng mới sau này. */
.typingInputRow,
.bkTransBox .typingInputRow,
.bkDictBox .typingInputRow{
  grid-template-columns:minmax(0,var(--typing-input-width,520px)) minmax(132px,150px) minmax(132px,150px)!important;
  width:fit-content!important;
  max-width:1120px!important;
  justify-content:center!important;
  align-items:stretch!important;
}
.typingInputRow .typingSentenceInput,
.bkTransBox .typingInputRow .typingSentenceInput,
.bkDictBox .typingInputRow .typingSentenceInput{
  width:var(--typing-input-width,520px)!important;
  max-width:820px!important;
  min-height:64px!important;
  height:64px;
  padding:.62rem 1rem!important;
  font-family:'Noto Serif SC','Noto Serif','Noto Serif CJK SC','Segoe UI',system-ui,sans-serif!important;
  font-size:1.5rem!important;
  line-height:1.5!important;
  letter-spacing:.01em;
}
@media(max-width:700px){
  .typingInputRow,
  .bkTransBox .typingInputRow,
  .bkDictBox .typingInputRow{
    grid-template-columns:1fr 1fr!important;
    width:100%!important;
    max-width:100%!important;
  }
  .typingInputRow .typingSentenceInput,
  .bkTransBox .typingInputRow .typingSentenceInput,
  .bkDictBox .typingInputRow .typingSentenceInput{
    grid-column:1/-1!important;
    width:100%!important;
    max-width:100%!important;
    min-height:58px!important;
    height:58px;
    font-size:1.28rem!important;
  }
}

/* V286 — QUY CÁCH CHUNG TOÀN BỘ TAB/CARD CHỌN NỘI DUNG
   Mọi khung chọn chế độ/bài học dùng hình chữ nhật bo góc 12px, không dùng dạng pill/tròn.
   Các nút hành động nhỏ, badge trạng thái và avatar không thuộc quy tắc này.
   Khi thêm tab/card lựa chọn mới, phải dùng --ui-select-radius để giữ đồng bộ toàn website. */
:root{--ui-select-radius:12px}
.tabGroupHead,
.tabBtn,
.subTabBtn,
.modeTabBtn,
.bkTabBtn2,
.bkTabBtn3{border-radius:var(--ui-select-radius)!important}

/* V277 — lớp đầu trang phải phủ toàn viewport và nằm TRÊN cây tab dọc.
   #pageHeaderStack cần overflow:hidden để animation thu gọn header hoạt động; vì vậy
   không để #hskNav tự dùng margin âm (sẽ bị wrapper cắt). Thay vào đó kéo chính wrapper
   phủ qua phần body dành cho sidebar, rồi trả .lessonHead về đúng cột nội dung. */
@media(min-width:900px){
  #pageHeaderStack{
    margin-left:-210px;
    width:calc(100% + 210px);
    box-sizing:border-box;
  }
  #pageHeaderStack > #hskNav{
    margin-left:0!important;
    width:100%!important;
  }
  #pageHeaderStack > .lessonHead{
    margin-left:210px;
  }
}
/* Chỉ thanh điều hướng đầu trang cần thắng stacking của sidebar (sidebar z-index:20). */
#hskNav{
  position:relative;
  z-index:40;
}



/* V287 — ô nhập Bài khóa: câu dài luôn hiển thị đầy đủ, không bị nút Kiểm tra/Đánh lại che.
   Riêng Dịch câu và Nghe–đánh chữ: khóa chiều rộng vào cột còn lại của hàng;
   khi nội dung dài thì textarea tự xuống dòng và tăng chiều cao. */
.bkTransBox .typingInputRow,
.bkDictBox .typingInputRow{
  display:grid!important;
  grid-template-columns:minmax(0,1fr) minmax(132px,150px) minmax(132px,150px)!important;
  width:min(100%,1120px)!important;
  max-width:1120px!important;
  margin:1rem auto 0!important;
  align-items:stretch!important;
}
.bkTransBox .typingInputRow .typingSentenceInput,
.bkDictBox .typingInputRow .typingSentenceInput{
  box-sizing:border-box!important;
  width:100%!important;
  max-width:none!important;
  min-width:0!important;
  min-height:64px!important;
  height:auto;
  overflow-x:hidden!important;
  overflow-y:hidden!important;
  white-space:pre-wrap!important;
  overflow-wrap:anywhere!important;
  word-break:break-word!important;
}
@media(max-width:700px){
  .bkTransBox .typingInputRow,
  .bkDictBox .typingInputRow{
    grid-template-columns:1fr 1fr!important;
    width:100%!important;
    max-width:100%!important;
  }
  .bkTransBox .typingInputRow .typingSentenceInput,
  .bkDictBox .typingInputRow .typingSentenceInput{
    grid-column:1/-1!important;
    width:100%!important;
    min-height:58px!important;
  }
}