/* ══════════════════════════════════════════════
   AE-PLX-LANGSON – Module HỌC TIẾNG ANH
   static/css/quiz.css  (Phase 3)
   Dùng KÈM english.css + tái dùng vài class fc-* của flashcard.css
   (fc-topbar, fc-back, fc-title, fc-cats, fc-cat, fc-speak-big được
    định nghĩa lại ở đây để trang quiz KHÔNG phụ thuộc flashcard.css)
   ══════════════════════════════════════════════ */

/* ── Topbar + chip chủ đề (bản sao độc lập) ── */
.fc-topbar{display:flex;align-items:center;gap:16px;flex-wrap:wrap;}
.fc-back{
  font-size:12px;color:var(--muted);text-decoration:none;
  padding:7px 12px;border-radius:9px;
  border:1px solid var(--border);transition:.18s;
}
.fc-back:hover{color:#fff;border-color:rgba(42,127,255,.35);}
.fc-title{font-size:17px;font-weight:800;color:#fff;}
.fc-cats{display:flex;gap:8px;flex-wrap:wrap;}
.fc-cat{
  display:flex;align-items:center;gap:7px;
  padding:8px 14px;border-radius:12px;cursor:pointer;
  background:var(--surface2);
  border:1px solid var(--border);
  font-size:12px;font-weight:600;color:var(--muted);transition:.18s;
}
.fc-cat:hover{transform:translateY(-1px);color:#aac8e0;border-color:rgba(42,127,255,.3);}
.fc-cat.active{
  background:rgba(42,127,255,.15);color:#fff;
  border-color:rgba(42,127,255,.45);
  box-shadow:0 4px 14px rgba(42,127,255,.15);
}
.fc-cat .cat-count{
  font-size:10px;color:#3a6a8a;
  background:rgba(0,0,0,.25);border-radius:8px;padding:1px 7px;
}
.fc-cat.active .cat-count{color:#8ec0ff;}
.fc-speak-big{
  width:44px;height:44px;border-radius:50%;cursor:pointer;flex-shrink:0;
  background:rgba(42,127,255,.12);
  border:1px solid rgba(42,127,255,.3);
  font-size:19px;transition:.2s;
}
.fc-speak-big:hover{background:rgba(42,127,255,.25);transform:scale(1.1);}

.qz-screen{display:flex;flex-direction:column;gap:16px;animation:qzIn .3s ease;}
@keyframes qzIn{from{opacity:0;transform:translateY(8px);}to{opacity:1;transform:translateY(0);}}

/* ══ MÀN 1: CHỌN ĐỀ ═══════════════════════════ */
.qz-setup-card{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:16px;padding:22px;
  display:flex;flex-direction:column;gap:12px;
}
.qz-setup-title{font-size:13px;font-weight:700;color:#fff;}
.qz-socau{display:flex;gap:8px;flex-wrap:wrap;}
.qz-socau-btn{
  padding:9px 20px;border-radius:12px;cursor:pointer;
  background:var(--surface2);
  border:1px solid var(--border);
  font-size:13px;font-weight:700;color:var(--muted);transition:.18s;
}
.qz-socau-btn:hover{color:#aac8e0;border-color:rgba(42,127,255,.3);}
.qz-socau-btn.active{
  background:rgba(42,127,255,.15);color:#fff;
  border-color:rgba(42,127,255,.45);
}
.qz-rules{
  font-size:11px;color:var(--muted);
  background:rgba(42,127,255,.05);
  border:1px solid rgba(42,127,255,.1);
  border-radius:10px;padding:10px 14px;
}
.qz-start{
  align-self:flex-start;
  padding:13px 32px;border-radius:12px;cursor:pointer;border:none;
  background:linear-gradient(90deg,var(--blue2),var(--blue));
  font-size:15px;font-weight:800;color:#fff;
  box-shadow:0 8px 24px rgba(42,127,255,.3);
  transition:.2s;
}
.qz-start:hover{transform:translateY(-2px);box-shadow:0 12px 30px rgba(42,127,255,.4);}
.qz-start:disabled{opacity:.5;cursor:wait;transform:none;}

/* ══ MÀN 2: LÀM BÀI ═══════════════════════════ */
.qz-play-head{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:14px;padding:14px 18px;
  display:flex;flex-direction:column;gap:10px;
}
.qz-progress-info{
  display:flex;justify-content:space-between;
  font-size:13px;color:var(--muted);
}
.qz-progress-info b{color:#fff;}
.qz-score-live{font-size:12px;}
.qz-progress-track{
  height:8px;border-radius:6px;overflow:hidden;
  background:rgba(42,127,255,.1);
  border:1px solid rgba(42,127,255,.15);
}
.qz-progress-fill{
  height:100%;width:0;border-radius:6px;
  background:linear-gradient(90deg,var(--blue2),#00c8ff);
  transition:width .35s cubic-bezier(.22,1,.36,1);
}

.qz-question-card{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:16px;padding:26px 22px;
  display:flex;flex-direction:column;align-items:center;gap:18px;
}
.qz-direction{
  font-size:11px;font-weight:700;color:#4a9fff;
  background:rgba(42,127,255,.1);
  border:1px solid rgba(42,127,255,.2);
  border-radius:12px;padding:4px 14px;
  text-transform:uppercase;letter-spacing:1.5px;
}
.qz-prompt-row{display:flex;align-items:center;gap:14px;}
.qz-prompt{
  font-size:36px;font-weight:800;color:#fff;text-align:center;line-height:1.2;
  text-shadow:0 4px 24px rgba(42,127,255,.3);
}
.qz-options{
  display:grid;grid-template-columns:1fr 1fr;gap:10px;
  width:100%;max-width:620px;
}
.qz-option{
  display:flex;align-items:center;gap:11px;
  padding:14px 16px;border-radius:12px;cursor:pointer;
  background:var(--surface2);
  border:1px solid var(--border);
  font-size:14px;font-weight:600;color:#c0d8ee;
  text-align:left;transition:.18s;
}
.qz-option:hover:not(:disabled){
  border-color:rgba(42,127,255,.4);transform:translateY(-2px);
}
.qz-option:disabled{cursor:default;}
.qz-option .opt-key{
  width:26px;height:26px;border-radius:8px;flex-shrink:0;
  background:rgba(42,127,255,.12);
  display:flex;align-items:center;justify-content:center;
  font-size:11px;font-weight:800;color:#4a9fff;
}
.qz-option.correct{
  background:rgba(0,200,100,.12);
  border-color:rgba(0,232,122,.5);color:#fff;
  animation:optPop .3s ease;
}
.qz-option.correct .opt-key{background:#00c864;color:#fff;}
.qz-option.wrong{
  background:rgba(255,77,77,.1);
  border-color:rgba(255,77,77,.45);color:#ff9a9a;
  animation:optShake .35s ease;
}
.qz-option.wrong .opt-key{background:#e04848;color:#fff;}
.qz-option.dim{opacity:.4;}
@keyframes optPop{50%{transform:scale(1.03);}}
@keyframes optShake{20%{transform:translateX(-5px);}40%{transform:translateX(5px);}
  60%{transform:translateX(-3px);}80%{transform:translateX(3px);}}

.qz-feedback{
  min-height:20px;font-size:13px;font-weight:700;text-align:center;
}
.qz-feedback.good{color:#00e87a;}
.qz-feedback.bad{color:#ff8a8a;}
.qz-feedback .fb-word{color:#8ec0ff;}
.qz-next{
  padding:11px 28px;border-radius:12px;cursor:pointer;border:none;
  background:linear-gradient(90deg,var(--blue2),var(--blue));
  font-size:13px;font-weight:700;color:#fff;transition:.2s;
}
.qz-next:hover{transform:translateY(-2px);box-shadow:0 8px 22px rgba(42,127,255,.35);}

/* ══ MÀN 3: KẾT QUẢ ═══════════════════════════ */
.qz-result-card{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:16px;padding:32px 24px;
  display:flex;flex-direction:column;align-items:center;gap:12px;
  max-width:640px;margin:0 auto;width:100%;
}
.qz-result-icon{font-size:52px;animation:rsPop .5s cubic-bezier(.22,1.4,.36,1);}
@keyframes rsPop{from{transform:scale(0);}to{transform:scale(1);}}
.qz-result-title{font-size:22px;font-weight:800;color:#fff;}
.qz-result-score{display:flex;align-items:baseline;gap:6px;}
.rs-big{font-size:46px;font-weight:900;color:#00e87a;}
.rs-small{font-size:16px;color:var(--muted);font-weight:600;}
.qz-result-bar{
  width:100%;max-width:360px;height:10px;border-radius:6px;overflow:hidden;
  background:rgba(42,127,255,.1);
  border:1px solid rgba(42,127,255,.15);
}
.qz-result-fill{
  height:100%;width:0;border-radius:6px;
  background:linear-gradient(90deg,#00c864,#00e87a);
  transition:width 1s cubic-bezier(.22,1,.36,1) .2s;
}
.qz-result-xp{
  font-size:19px;font-weight:800;color:#ffb340;
  text-shadow:0 0 16px rgba(255,179,64,.4);
}
.qz-result-note{font-size:12px;color:var(--muted);text-align:center;}

.qz-wrong-list{width:100%;display:flex;flex-direction:column;gap:7px;margin-top:6px;}
.qz-wrong-item{
  display:flex;align-items:center;gap:10px;
  background:rgba(255,77,77,.05);
  border-left:2px solid rgba(255,77,77,.5);
  border-radius:9px;padding:9px 13px;
  font-size:12px;color:#c0d8ee;
}
.qz-wrong-item b{color:#fff;}
.qz-wrong-item .wr-mean{color:#8ec0ff;}
.qz-wrong-title{
  font-size:11px;font-weight:700;color:#ff8a8a;
  text-transform:uppercase;letter-spacing:1px;margin-top:8px;
}

.qz-result-actions{display:flex;gap:10px;margin-top:10px;flex-wrap:wrap;justify-content:center;}
.qz-again{
  padding:11px 26px;border-radius:12px;cursor:pointer;border:none;
  background:linear-gradient(90deg,var(--blue2),var(--blue));
  font-size:13px;font-weight:700;color:#fff;transition:.2s;
}
.qz-again:hover{transform:translateY(-2px);}
.qz-home{
  padding:11px 26px;border-radius:12px;text-decoration:none;
  background:rgba(255,255,255,.04);
  border:1px solid var(--border);
  font-size:13px;font-weight:700;color:var(--muted);transition:.2s;
}
.qz-home:hover{color:#fff;border-color:rgba(42,127,255,.35);}

/* ══ RESPONSIVE ═══════════════════════════════ */
@media(max-width:800px){
  .qz-options{grid-template-columns:1fr;}
  .qz-prompt{font-size:28px;}
  .qz-start{align-self:stretch;text-align:center;}
}