/* Quiz Engine — visual skin matching QUIZ/AI Studio design */
:root {
  --qe-bg:         #f9efe1;
  --qe-panel:      #ffffff;
  --qe-rule:       #e8d4ba;
  --qe-ink:        #2d3142;
  --qe-ink-soft:   #5b5d75;
  --qe-muted:      #8a8aa3;
  --qe-rose:       #c47b8a;
  --qe-rose-deep:  #9c5c6e;
  --qe-rose-soft:  #f4d8de;
  --qe-plum:       #6d5b8a;
  --qe-plum-deep:  #4e4068;
  --qe-plum-soft:  #e3dbef;
  --qe-gold:       #d6a85f;
  --qe-gold-deep:  #a87f3f;
  --qe-gold-soft:  #f5e4c3;
  --qe-green:      #6b9b7c;
  --qe-green-soft: #d8e9dc;
  --qe-red:        #c4646b;
  --qe-red-soft:   #f5d8db;
  --qe-shadow:     0 4px 0 #e8d4ba;
  --qe-shadow-sm:  0 3px 0 #e8d4ba;
  --qe-shadow-xs:  0 1px 0 #e8d4ba;
}

/* ── Shell ─────────────────────────────────────────────── */
.qe-shell {
  background: var(--qe-panel);
  border: 2px solid var(--qe-rule);
  border-radius: 22px;
  box-shadow: var(--qe-shadow);
  overflow: hidden;
  margin-bottom: 24px;
}

/* ── Section header bar ─────────────────────────────────── */
.qe-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  background: var(--qe-bg);
  border-bottom: 2px solid var(--qe-rule);
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--qe-ink-soft);
}
.qe-header-divider {
  flex: 1;
  height: 2px;
  background: var(--qe-rule);
  border-radius: 1px;
}
.qe-dots {
  display: flex;
  gap: 5px;
  align-items: center;
}
.qe-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--qe-rule);
  transition: background 0.2s, transform 0.2s;
}
.qe-dot--current { background: var(--qe-plum); transform: scale(1.3); }
.qe-dot--ok      { background: var(--qe-green); }
.qe-dot--wrong   { background: var(--qe-red); }

/* ── Body pad ───────────────────────────────────────────── */
.qe-body { padding: 32px 36px; }
@media (max-width: 600px) { .qe-body { padding: 22px 18px; } }

/* ── Slide-in animation ─────────────────────────────────── */
@keyframes qe-in {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}
.qe-anim { animation: qe-in 0.22s ease; }

/* ── Start screen ───────────────────────────────────────── */
.qe-start { text-align: center; }
.qe-start-icon {
  width: 68px; height: 68px;
  margin: 0 auto 20px;
  background: var(--qe-plum-soft);
  border-radius: 18px;
  display: flex; align-items: center; justify-content: center;
  color: var(--qe-plum-deep);
}
.qe-start h2 {
  font-size: 24px; font-weight: 800;
  color: var(--qe-ink); margin: 0 0 10px;
}
.qe-start p {
  color: var(--qe-ink-soft); font-size: 15px;
  max-width: 380px; margin: 0 auto 28px;
}

/* ── Primary button ─────────────────────────────────────── */
.qe-btn {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 14px 32px;
  border-radius: 16px;
  background: var(--qe-rose);
  color: #fff;
  font-weight: 800; font-size: 16px;
  border: none; border-bottom: 4px solid var(--qe-rose-deep);
  cursor: pointer;
  transition: background 0.15s, transform 0.1s, border-bottom-width 0.1s;
}
.qe-btn:hover  { background: var(--qe-rose-deep); }
.qe-btn:active { transform: translateY(2px); border-bottom-width: 0; }
.qe-btn--full  { display: flex; width: 100%; justify-content: center; margin-top: 18px; }
.qe-btn--ghost {
  background: var(--qe-bg);
  color: var(--qe-ink);
  border-bottom-color: var(--qe-rule);
}
.qe-btn--ghost:hover { background: var(--qe-rule); }

/* ── Question header row ────────────────────────────────── */
.qe-q-header {
  display: flex; align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}
.qe-q-left  { display: flex; align-items: center; gap: 10px; }
.qe-q-right { display: flex; align-items: center; gap: 8px; }

/* ── Streak chip ────────────────────────────────────────── */
.qe-streak-chip {
  display: flex; align-items: center; gap: 4px;
  padding: 5px 11px; border-radius: 999px;
  background: var(--qe-rose-soft);
  border: 2px solid var(--qe-rose);
  color: var(--qe-rose-deep);
  font-size: 13px; font-weight: 800;
  animation: qe-pop 0.25s ease;
}
@keyframes qe-pop {
  0%   { transform: scale(0.85); }
  60%  { transform: scale(1.08); }
  100% { transform: scale(1); }
}
.qe-num-badge {
  width: 30px; height: 30px; border-radius: 50%;
  background: var(--qe-plum); color: #fff;
  font-weight: 800; font-size: 13px;
  display: flex; align-items: center; justify-content: center;
}
.qe-num-label {
  font-size: 11px; font-weight: 800;
  text-transform: uppercase; letter-spacing: 0.1em;
  color: var(--qe-muted);
}

/* ── Timer chip ─────────────────────────────────────────── */
.qe-timer {
  display: flex; align-items: center; gap: 5px;
  padding: 5px 13px; border-radius: 999px;
  border: 2px solid var(--qe-rule);
  background: var(--qe-bg);
  font-size: 14px; font-weight: 700; font-family: monospace;
  color: var(--qe-ink);
  transition: background 0.3s, border-color 0.3s, color 0.3s;
}
.qe-timer--urgent {
  background: var(--qe-red-soft);
  border-color: var(--qe-red);
  color: var(--qe-red);
}

/* ── Timer progress bar ─────────────────────────────────── */
.qe-timer-track {
  height: 4px; background: var(--qe-rule);
  border-radius: 2px; overflow: hidden;
  margin-bottom: 22px;
}
.qe-timer-bar {
  height: 100%; background: var(--qe-plum);
  border-radius: 2px;
  transition: width 1s linear, background 0.3s;
}
.qe-timer-bar--urgent { background: var(--qe-red); }

/* ── Question text ──────────────────────────────────────── */
.qe-q-text {
  font-size: 19px; font-weight: 700;
  color: var(--qe-ink); line-height: 1.45;
  margin-bottom: 22px;
}

/* ── Options ────────────────────────────────────────────── */
.qe-opts {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 9px;
}
@media (max-width: 560px) { .qe-opts { grid-template-columns: 1fr; } }

.qe-opt {
  display: flex; align-items: center; gap: 10px;
  padding: 13px 15px;
  border-radius: 13px;
  border: 2px solid var(--qe-rule);
  background: var(--qe-panel);
  box-shadow: var(--qe-shadow-sm);
  cursor: pointer; text-align: left; width: 100%;
  font-size: 14px; font-weight: 500; color: var(--qe-ink);
  transition: border-color 0.14s, background 0.14s, transform 0.1s, box-shadow 0.1s, opacity 0.14s;
}
.qe-opt:hover:not(:disabled)  { border-color: var(--qe-rose); }
.qe-opt:active:not(:disabled) { transform: translateY(2px); box-shadow: var(--qe-shadow-xs); }
.qe-opt:disabled { cursor: default; }

.qe-opt-letter {
  width: 28px; height: 28px; border-radius: 7px; flex-shrink: 0;
  background: var(--qe-plum-soft); color: var(--qe-plum-deep);
  font-weight: 800; font-size: 12px;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.14s, color 0.14s;
}

/* Suspense — gold pulse */
.qe-opt--suspense {
  border-color: var(--qe-gold); background: var(--qe-gold-soft);
  transform: translateY(2px); box-shadow: var(--qe-shadow-xs);
  animation: qe-pulse 0.7s ease-in-out infinite;
}
.qe-opt--suspense .qe-opt-letter { background: var(--qe-gold); color: #fff; }
@keyframes qe-pulse { 0%,100%{opacity:1} 50%{opacity:.65} }

/* Correct */
.qe-opt--ok {
  border-color: var(--qe-green); background: var(--qe-green-soft);
  transform: translateY(2px); box-shadow: var(--qe-shadow-xs);
}
.qe-opt--ok .qe-opt-letter { background: var(--qe-green); color: #fff; }

/* Incorrect */
.qe-opt--wrong {
  border-color: var(--qe-red); background: var(--qe-red-soft);
  transform: translateY(2px); box-shadow: var(--qe-shadow-xs);
}
.qe-opt--wrong .qe-opt-letter { background: var(--qe-red); color: #fff; }

/* Dimmed */
.qe-opt--dim { opacity: 0.4; box-shadow: none; border-color: var(--qe-rule); background: var(--qe-bg); }
.qe-opt--dim .qe-opt-letter { background: var(--qe-rule); color: var(--qe-muted); }

/* ── Feedback banner ────────────────────────────────────── */
.qe-feedback {
  display: flex; gap: 11px; align-items: flex-start;
  padding: 14px 16px; border-radius: 14px; border: 2px solid;
  font-size: 14px; font-weight: 500;
  margin-top: 18px;
  animation: qe-in 0.18s ease;
}
.qe-feedback--ok  { background: var(--qe-green-soft); border-color: var(--qe-green); color: var(--qe-ink); }
.qe-feedback--err { background: var(--qe-red-soft);   border-color: var(--qe-red);   color: var(--qe-ink); }
.qe-feedback svg  { flex-shrink: 0; margin-top: 2px; }
.qe-explain {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  opacity: 0.85;
  font-style: italic;
}
.qe-xp-tag {
  display: inline-block; margin-left: 6px;
  padding: 1px 8px; border-radius: 8px;
  background: var(--qe-gold-soft); color: var(--qe-gold-deep);
  font-weight: 800; font-size: 12px; border: 1px solid var(--qe-gold);
}

/* ── Summary ────────────────────────────────────────────── */
.qe-summary { text-align: center; }
.qe-summary-icon {
  width: 72px; height: 72px; border-radius: 50%;
  margin: 0 auto 18px;
  background: var(--qe-gold-soft);
  border: 2px solid var(--qe-gold);
  color: var(--qe-gold-deep);
  display: flex; align-items: center; justify-content: center;
}
.qe-summary h2 { font-size: 24px; font-weight: 800; color: var(--qe-ink); margin: 0 0 8px; }
.qe-summary > p { color: var(--qe-ink-soft); font-size: 15px; margin: 0 0 22px; }
.qe-stats {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 10px; margin-bottom: 20px;
}
.qe-stat {
  background: var(--qe-bg); border: 2px solid var(--qe-rule);
  border-radius: 16px; padding: 18px 10px;
  box-shadow: var(--qe-shadow-sm);
  display: flex; flex-direction: column; align-items: center; gap: 5px;
}
.qe-stat-icon {
  width: 38px; height: 38px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
}
.qe-stat-icon--green { background: var(--qe-green-soft); color: var(--qe-green); }
.qe-stat-icon--rose  { background: var(--qe-rose-soft);  color: var(--qe-rose-deep); }
.qe-stat-icon--gold  { background: var(--qe-gold-soft);  color: var(--qe-gold-deep); }
.qe-stat-val  { font-size: 26px; font-weight: 800; color: var(--qe-ink); line-height: 1; }
.qe-stat-lbl  { font-size: 9px; font-weight: 800; text-transform: uppercase; letter-spacing: 0.12em; color: var(--qe-muted); }
.qe-badge {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 8px 18px; border-radius: 13px; margin-bottom: 18px;
  background: var(--qe-gold-soft); border: 2px solid var(--qe-gold);
  color: var(--qe-gold-deep); font-weight: 800; font-size: 13px;
}
.qe-badge svg { flex-shrink: 0; }