:root{
  --qr-bg:var(--brand-background,#faf7f2); --qr-paper:var(--brand-surface,#fffdfa); --qr-ink:var(--brand-ink,#2b2523); --qr-muted:var(--brand-muted,#7d7169);
  --qr-line:var(--brand-line,#e9e0d6); --qr-line2:var(--brand-line,#e9e0d6); --qr-brand:var(--brand-primary,#8b2e2e); --qr-brand2:var(--brand-tint,#f5e7e4);
  --qr-green:#2f6b57; --qr-green2:#e8f2ed; --qr-gold:var(--brand-secondary,#b4864a);
  --qr-shadow:0 18px 45px -28px rgba(62,40,30,.35);
}
body.qr-redesign{background:
  radial-gradient(1200px 500px at 12% -8%, color-mix(in srgb,var(--brand-tint,#f5e7e4) 70%, #fff) 0%, transparent 55%),
  radial-gradient(900px 420px at 92% 4%, color-mix(in srgb,var(--brand-soft,#f7f0df) 60%, #fff) 0%, transparent 50%),
  var(--brand-background,#faf7f2) !important;}
body.qr-redesign main{padding-top:18px}
body.qr-redesign #practice .section-heading{max-width:100%;margin:0 auto 14px}
body.qr-redesign #practice > .practice-course-controls,
body.qr-redesign #practice > .domain-list,
body.qr-redesign #practice > .question-picker{max-width:100%;margin-left:auto;margin-right:auto}

/* question */
body.qr-redesign article.question.panel{
  max-width:100%;margin:0 auto;padding:0;border:0;background:transparent;box-shadow:none;
}
body.qr-redesign .qr-card{
  background:var(--qr-paper);border:1px solid var(--qr-line);border-radius:22px;
  box-shadow:var(--qr-shadow);position:relative;overflow:hidden;
}
body.qr-redesign .qr-question-card{padding:30px 36px 24px;margin-bottom:24px}
body.qr-redesign .qr-question-card:before{
  content:"";position:absolute;inset:0 0 auto 0;height:4px;
  background:linear-gradient(90deg,var(--qr-brand) 0%,color-mix(in srgb,var(--qr-brand) 58%, #fff) 45%,color-mix(in srgb,var(--qr-gold) 40%, #fff) 100%);
}
body.qr-redesign .qr-question-card .question-top{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  color:var(--qr-muted);font-size:13px;padding:0 0 14px;border-bottom:1px dashed var(--qr-line2);
}
body.qr-redesign .qr-question-card .question-top span:first-child{color:var(--qr-brand);font-weight:600}
body.qr-redesign .qr-question-card .question-top span:last-child{color:#9a8c81;font-size:12px}
body.qr-redesign #stem{
  font-family:"Noto Serif SC","Songti SC","STSong",serif;
  font-size:clamp(21px,2.7vw,28px);line-height:1.78;color:var(--qr-ink);
  padding:20px 0 10px;margin:0;
}
body.qr-redesign #stem .katex{font-size:1.02em}
body.qr-redesign #figures img{max-width:100%;border-radius:12px;margin:10px 0}
body.qr-redesign #stem:after{content:"";display:block;margin-top:18px;border-top:1px dashed var(--qr-line2)}
body.qr-redesign .qr-question-card .question-top{padding-top:2px}

/* answer */
body.qr-redesign .qr-answer-card{padding:22px 26px 24px;margin-bottom:26px}
body.qr-redesign .qr-answer-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px}
body.qr-redesign .qr-h2{font-family:"Noto Serif SC","Songti SC",serif;font-size:19px;margin:0;display:flex;align-items:center;gap:9px}
body.qr-redesign .qr-h2:before{content:"";width:8px;height:8px;border-radius:50%;background:var(--qr-brand);box-shadow:0 0 0 4px var(--qr-brand2)}
body.qr-redesign .qr-autosave{font-size:12px;color:#9a8c81}
body.qr-redesign .qr-autosave:before{content:"●";color:#7aa58f;font-size:8px;margin-right:5px;vertical-align:middle}
body.qr-redesign .qr-tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:0}
body.qr-redesign .qr-tabs button{
  border:1px solid #e7dbcf;border-bottom:0;background:#fff;color:#6d6057;
  border-radius:10px 10px 0 0;padding:9px 14px;font:inherit;font-size:13px;cursor:pointer;
}
body.qr-redesign .qr-tabs button.on{background:var(--qr-brand2);border-color:#e3cbc5;color:var(--qr-brand);font-weight:600}
body.qr-redesign .qr-panel{border:1px solid #e7dbcf;border-radius:0 14px 14px 14px;background:#fffdfb;overflow:hidden}
body.qr-redesign .qr-panel label[for="answer"]{display:none}
body.qr-redesign #answer{
  width:100%;min-height:150px;border:0;outline:none;resize:vertical;padding:16px;
  font:inherit;font-size:14.5px;line-height:1.85;background:transparent;color:#332b26;display:block;
}
body.qr-redesign #answer::placeholder{color:#b0a398}
body.qr-redesign .qr-panel details.handwriting-panel{border:0}
body.qr-redesign .qr-panel details.handwriting-panel summary{padding:14px 16px;color:#6d6057;font-size:13px;cursor:pointer}
body.qr-redesign .qr-panel .ink-toolbar{padding:0 14px 12px;display:flex;flex-wrap:wrap;gap:8px;align-items:center}
body.qr-redesign .qr-panel #handwriting{width:100%;max-height:320px;border-top:1px solid #f0e8dd;background:#fff}
body.qr-redesign .qr-panel .work-upload{padding:18px 16px}
body.qr-redesign .qr-panel .work-upload p{margin-top:8px}
body.qr-redesign .qr-answer-card .actions{
  display:flex;align-items:center;gap:10px;margin-top:14px;justify-content:flex-end;
}
body.qr-redesign .qr-answer-card .actions .primary{
  background:var(--qr-brand);border-color:var(--qr-brand);border-radius:10px;padding:10px 18px;
}
body.qr-redesign .qr-answer-card .actions .primary:hover{background:var(--brand-hover,#6f2222)}
body.qr-redesign .qr-answer-card .actions .secondary{border-radius:10px;padding:10px 16px}

/* teaching */
body.qr-redesign .teaching-panel{margin-top:0}
body.qr-redesign .qr-teach-grid{display:grid;grid-template-columns:minmax(0,1.62fr) minmax(280px,.9fr);gap:24px;align-items:start}
body.qr-redesign .qr-main{
  align-self:start;
  background:var(--qr-paper);border:1px solid var(--qr-line);border-radius:20px;padding:22px 26px 20px;
  box-shadow:0 10px 30px -26px rgba(62,40,30,.4);
}
body.qr-redesign .qr-side{
  background:var(--qr-paper);border:1px solid var(--qr-line);border-radius:20px;padding:22px;
  box-shadow:0 10px 30px -26px rgba(62,40,30,.4);position:sticky;top:18px;
}
body.qr-redesign .teaching-heading{padding:0 0 12px}
body.qr-redesign .teaching-heading .eyebrow{display:none}
body.qr-redesign #teachingTitle{display:none}
body.qr-redesign .qr-main:before{content:"解析与提示";display:block;font-family:"Noto Serif SC","Songti SC",serif;font-size:19px;margin:0 0 12px;padding-left:10px;border-left:5px solid var(--qr-brand)}
body.qr-redesign #teachingKnowledge{font-size:13.5px;color:#4b403a}
body.qr-redesign #teachingKnowledge:before{content:"知识与难点";display:block;font-family:"Noto Serif SC","Songti SC",serif;font-size:16px;margin-bottom:12px;padding-left:10px;border-left:5px solid var(--qr-brand)}
body.qr-redesign #teachingKnowledge a,body.qr-redesign #teachingKnowledge .chip{font-size:12.5px}
body.qr-redesign #teachingNotice{font-size:12.5px;color:#9a8c81;margin:10px 0}
body.qr-redesign #selfReport{border-top:1px dashed var(--qr-line2);margin-top:14px;padding-top:12px}
body.qr-redesign #selfReport .self-report-title,body.qr-redesign #selfReport p{font-size:13px;color:#6b5f56}
body.qr-redesign #reportStatus{font-size:12px;color:#9a8c81}
body.qr-redesign #hintList{margin-top:8px}
body.qr-redesign .teaching-actions{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:16px 0 10px}
body.qr-redesign .teaching-actions button{
  border:1px solid #e5d9cd;background:#fff;color:#5e534b;border-radius:10px;padding:9px 13px;font-size:13px;
}
body.qr-redesign .teaching-actions button:hover{border-color:var(--qr-brand);color:var(--qr-brand)}
body.qr-redesign #unlockNotice{flex-basis:100%;font-size:12px;color:#9a8c81;margin:0}
body.qr-redesign #teachingBody{border-top:1px dashed var(--qr-line2);padding-top:16px;margin-top:6px;font-size:15px;line-height:1.85}
body.qr-redesign #teachingBody .math-content{font-size:15px}
body.qr-redesign #teachingMapping{font-size:11.5px;color:#a4968b}

/* feedback */
body.qr-redesign #questionFeedback{
  max-width:100%;margin:24px auto 0;background:var(--qr-paper);border:1px solid var(--qr-line);
  border-radius:18px;box-shadow:0 8px 24px -26px rgba(62,40,30,.4);overflow:hidden;
}
body.qr-redesign #questionFeedback details summary{
  list-style:none;cursor:pointer;display:flex;align-items:center;gap:12px;
  padding:16px 22px;font-size:14px;color:#5b4f47;
}
body.qr-redesign #questionFeedback details summary::-webkit-details-marker{display:none}
body.qr-redesign #questionFeedback details summary:before{
  content:"!";width:24px;height:24px;border-radius:8px;background:#f7ece8;color:var(--qr-brand);
  display:inline-flex;align-items:center;justify-content:center;font-weight:700;font-size:13px;
}
body.qr-redesign #questionFeedback details[open] summary{border-bottom:1px solid #f0e8dd;background:#fbf7f1}
body.qr-redesign #questionFeedback details form{padding:18px 22px 22px}
body.qr-redesign #questionFeedback fieldset{border:0;padding:0;margin:0 0 12px}
body.qr-redesign #questionFeedback legend{font-size:12.5px;color:#9a8c81;margin-bottom:8px}
body.qr-redesign #questionFeedback fieldset label{display:inline-flex;align-items:center;gap:6px;margin:0 14px 8px 0;font-size:13px}
body.qr-redesign #questionFeedback textarea{width:100%;border:1px solid #e5d9cd;border-radius:10px;padding:10px 12px;font:inherit;font-size:13.5px;background:#fffdfb}
body.qr-redesign #questionFeedback button[type="submit"]{margin-top:10px;background:var(--qr-brand);color:#fff;border:0;border-radius:9px;padding:9px 16px}

/* existing #feedback (after submit) */
body.qr-redesign #feedback{margin-top:24px;background:var(--qr-paper);border:1px solid var(--qr-line);border-radius:20px;padding:24px 26px;box-shadow:var(--qr-shadow)}
body.qr-redesign #feedback .eyebrow{display:none}
body.qr-redesign #feedbackTitle{font-family:"Noto Serif SC","Songti SC",serif;font-size:19px;margin:0 0 12px}
body.qr-redesign #feedback #solution{font-size:15px;line-height:1.9}

@media(max-width:900px){
  body.qr-redesign .qr-teach-grid{grid-template-columns:1fr}
  body.qr-redesign .qr-side{position:static}
}
@media(max-width:640px){
  body.qr-redesign main{padding-left:12px;padding-right:12px}
  body.qr-redesign #practice .section-heading{margin-bottom:10px}
  body.qr-redesign .qr-question-card{padding:22px 18px 18px;border-radius:18px}
  body.qr-redesign #stem{font-size:21px;line-height:1.7}
  body.qr-redesign .qr-answer-card{padding:18px 14px}
  body.qr-redesign .qr-answer-head{margin-bottom:10px}
  body.qr-redesign .qr-tabs button{padding:8px 10px;font-size:12px}
  body.qr-redesign .qr-answer-card .actions{justify-content:stretch}
  body.qr-redesign .qr-answer-card .actions button{flex:1}
  body.qr-redesign .qr-main,body.qr-redesign .qr-side{padding:18px 16px}
  body.qr-redesign #questionFeedback{margin-top:18px}
  body.qr-redesign #questionFeedback details summary{padding:14px 16px;font-size:13px}
}

/* existing answer editor */
body.qr-redesign .qr-answer-card .as-practice-editor{padding:0;border:0;background:transparent}
body.qr-redesign .qr-answer-card .as-practice-editor > h3{display:none}
body.qr-redesign .as-seg{display:flex;gap:6px;flex-wrap:wrap;margin:0 0 12px}
body.qr-redesign .as-seg button{border:1px solid #e7dbcf;border-radius:10px;background:#fff;color:#6d6057;padding:8px 12px;font:inherit;font-size:13px;cursor:pointer}
body.qr-redesign .as-seg button.on{background:var(--qr-brand2);border-color:#e3cbc5;color:var(--qr-brand);font-weight:600}
body.qr-redesign .as-practice-editor textarea{border:1px solid #e7dbcf;border-radius:12px;padding:14px;font:inherit;font-size:14.5px;line-height:1.8;background:#fffdfb;width:100%}
body.qr-redesign .as-practice-block{border:1px solid #eee5db;border-radius:12px;padding:10px;margin-bottom:10px;background:#fffdfb}
body.qr-redesign .as-row{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}
body.qr-redesign .as-row button,body.qr-redesign .as-secondary{border:1px solid #e5d9cd;background:#fff;color:#5e534b;border-radius:9px;padding:7px 11px;font-size:12.5px}

/* final sizing fixes */
body.qr-redesign .teaching-panel{min-height:0 !important}
body.qr-redesign .qr-main,body.qr-redesign .qr-side{min-height:0 !important;height:auto !important}
body.qr-redesign #teachingBody:empty{display:none}
body.qr-redesign #teachingMapping:empty{display:none}
body.qr-redesign #questionFeedback{width:100%}
body.qr-redesign .qr-teach-grid{align-items:start}

body.qr-redesign article.question.panel{max-width:100% !important;margin-left:auto !important;margin-right:auto !important;width:auto !important}

/* focused practice */
body.qr-redesign.qr-focus #practice .section-heading,
body.qr-redesign.qr-focus .practice-course-controls,
body.qr-redesign.qr-focus .domain-list,
body.qr-redesign.qr-focus #questionPicker{display:none !important}
body.qr-redesign.qr-show-picker #practice .section-heading,
body.qr-redesign.qr-show-picker .practice-course-controls,
body.qr-redesign.qr-show-picker .domain-list,
body.qr-redesign.qr-show-picker #questionPicker{display:block !important}
body.qr-redesign .qr-picker-toggle{
  border:1px solid #e3d5c8;background:#fff;color:#6d6057;border-radius:999px;
  padding:5px 12px;font:inherit;font-size:12px;cursor:pointer;margin-left:auto;
}
body.qr-redesign .qr-picker-toggle:hover{border-color:var(--qr-brand);color:var(--qr-brand)}
body.qr-redesign .qr-question-card{padding-top:22px}
body.qr-redesign .question-top{flex-wrap:wrap;gap:8px}
body.qr-redesign .question-top span:last-child{display:none}

/* compact answer */
body.qr-redesign .qr-answer-card{padding:18px 22px 20px}
body.qr-redesign .qr-answer-head{margin-bottom:10px}
body.qr-redesign .qr-answer-card .as-practice-editor > h3{display:none}
body.qr-redesign .as-practice-block{padding:8px;margin-bottom:8px}
body.qr-redesign .as-practice-editor textarea{min-height:104px;max-height:220px}
body.qr-redesign .as-row{margin:8px 0 4px}
body.qr-redesign .qr-answer-card .actions{margin-top:10px;padding-top:10px;border-top:1px dashed #eee5db}
body.qr-redesign .qr-answer-card .actions .primary{padding:9px 16px;font-size:13px}
body.qr-redesign .qr-answer-card .actions .secondary{padding:9px 14px;font-size:13px}

/* compact sidebar */
body.qr-redesign #teachingNotice{display:none}
body.qr-redesign #teachingKnowledge{font-size:13px}
body.qr-redesign #teachingKnowledge a{
  display:inline-block;background:#f6f1ea;border:1px solid #e9dfd3;color:#5e534b;
  border-radius:8px;padding:4px 8px;margin:0 6px 6px 0;text-decoration:none;font-size:12.5px;
}
body.qr-redesign #teachingKnowledge a:hover{border-color:var(--qr-gold);color:#8a5c19}
body.qr-redesign .qr-collapse{border-top:1px dashed var(--qr-line2);margin-top:12px;padding-top:10px}
body.qr-redesign .qr-collapse summary{cursor:pointer;font-size:12.5px;color:var(--brand-muted,#7d7169);list-style:none}
body.qr-redesign .qr-collapse summary::-webkit-details-marker{display:none}
body.qr-redesign .qr-collapse summary:before{content:"▸";color:var(--qr-gold);margin-right:6px}
body.qr-redesign .qr-collapse[open] summary:before{content:"▾"}
body.qr-redesign .qr-empty-hint{margin:8px 0 0;color:#9a8c81;font-size:12px}
body.qr-redesign #questionFeedback{margin-top:18px}

/* polish pass */
body.qr-redesign #teachingRevision{display:none !important}
body.qr-redesign .as-practice-block > .as-ghost{display:none !important}
body.qr-redesign .qr-collapse summary{list-style:none}
body.qr-redesign .qr-collapse summary:before{content:"▸";display:inline-block;color:var(--qr-gold);margin-right:6px}
body.qr-redesign .qr-collapse[open] summary:before{content:"▾"}
body.qr-redesign .qr-answer-card .as-row button{font-size:12px;padding:6px 10px;color:#8a7d72;background:#fbf7f1}
body.qr-redesign .qr-answer-card .as-practice-editor > p.muted{font-size:12px;color:#9a8c81}

/* final marker fix */
body.qr-redesign .qr-collapse summary{list-style:none}
body.qr-redesign .qr-collapse summary::-webkit-details-marker{display:none}
body.qr-redesign .qr-collapse summary::marker{content:"";font-size:0}
body.qr-redesign .qr-answer-card{padding-bottom:14px}

/* compact final */
body.qr-redesign .qr-collapse{display:none !important}
body.qr-redesign #answerForm{display:block !important;min-height:0 !important}
body.qr-redesign .as-practice-editor{min-height:0 !important}
body.qr-redesign .qr-answer-card .as-practice-editor > p.muted{display:none}

/* shell + compact v203 */
body.qr-redesign .desktop-use-note{display:none !important}
body.qr-redesign .tabs{
  width:max-content;max-width:100%;margin:0 auto 16px;display:inline-flex;gap:4px;
  background:var(--brand-surface,#fffdfa);border:1px solid var(--qr-line);border-radius:999px;padding:4px;
  box-shadow:0 8px 24px -26px rgba(62,40,30,.4);
}
body.qr-redesign .tabs button{
  border:0;background:transparent;border-radius:999px;padding:8px 16px;font:inherit;font-size:13px;
  color:#6d6057;cursor:pointer;
}
body.qr-redesign .tabs button.active{background:var(--qr-brand);color:#fff}
body.qr-redesign .tabs button:hover:not(.active){color:var(--qr-brand);background:var(--qr-brand2)}
body.qr-redesign .as-practice-editor > p.as-muted{display:none !important}
body.qr-redesign .as-pr-status{display:none !important}
body.qr-redesign .teaching-heading{display:none !important}
body.qr-redesign .qr-main{padding:18px 22px 16px}
body.qr-redesign .teaching-actions{margin:0 0 4px}
body.qr-redesign #hintList:empty{display:none}
body.qr-redesign #teachingError:empty{display:none}

/* mobile nav no wrap */
@media(max-width:640px){
  body.qr-redesign .tabs{
    width:100% !important;max-width:100% !important;display:flex !important;flex-wrap:nowrap;
    overflow-x:auto;justify-content:flex-start;border-radius:14px;padding:4px;margin-bottom:12px;
    -webkit-overflow-scrolling:touch;
  }
  body.qr-redesign .tabs button{flex:0 0 auto;white-space:nowrap;padding:8px 12px;font-size:12.5px}
}

/* picker mode */
body.qr-redesign .qr-picker-bar{display:none}
body.qr-redesign.qr-show-picker .qr-picker-bar{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  max-width:100%;margin:0 auto 14px;padding:10px 16px;
  background:var(--brand-surface,#fffdfa);border:1px solid var(--qr-line);border-radius:14px;
  box-shadow:0 8px 24px -26px rgba(62,40,30,.35);font-size:13.5px;color:#6d6057;
}
body.qr-redesign.qr-show-picker .qr-picker-bar span{font-family:"Noto Serif SC","Songti SC",serif;font-size:16px;color:#3b332f}
body.qr-redesign .qr-picker-close{
  border:1px solid #e3d5c8;background:#fff;color:#6d6057;border-radius:999px;
  padding:6px 13px;font:inherit;font-size:12.5px;cursor:pointer;
}
body.qr-redesign .qr-picker-close:hover{border-color:var(--qr-brand);color:var(--qr-brand)}
body.qr-redesign.qr-show-picker article.question.panel{display:none !important}
body.qr-redesign.qr-show-picker .domain-list{
  display:grid !important;grid-template-columns:repeat(4,minmax(0,1fr)) !important;gap:18px !important;
}
@media(max-width:900px){
  body.qr-redesign.qr-show-picker .domain-list{grid-template-columns:repeat(2,minmax(0,1fr)) !important}
}
@media(max-width:640px){
  body.qr-redesign.qr-show-picker .domain-list{grid-template-columns:1fr !important}
}

/* remove custom picker toggle; selector stays native */
body.qr-redesign .qr-picker-toggle,body.qr-redesign .qr-picker-bar{display:none !important}
body.qr-redesign.qr-focus .practice-course-controls,body.qr-redesign.qr-focus .domain-list,body.qr-redesign.qr-focus #questionPicker{display:revert !important}