/* ---------- Quiz layout ---------- */
.quiz-main {
  max-width: 960px;
  margin: 0 auto;
  padding: 28px 20px 80px;
}
.quiz-screen { animation: fadeIn .25s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* hero */
.quiz-hero {
  text-align: center;
  padding: 24px 16px 32px;
}
.quiz-hero h1 {
  font-size: 32px;
  color: var(--primary);
  margin: 8px 0 12px;
}
.quiz-hero .lead {
  color: var(--text-muted);
  font-size: 15.5px;
  line-height: 1.7;
  max-width: 640px;
  margin: 0 auto;
}

/* category grid */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin: 28px 0;
}
.cat-card {
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  cursor: pointer;
  transition: all .2s;
  text-align: left;
  position: relative;
  font-family: inherit;
  font-size: 14px;
  color: var(--text);
  width: 100%;
}
.cat-card:hover {
  border-color: var(--primary);
  box-shadow: 0 4px 18px rgba(31, 78, 121, 0.15);
  transform: translateY(-2px);
}
.cat-card .cat-icon {
  font-size: 32px;
  margin-bottom: 8px;
  display: block;
}
.cat-card .cat-name {
  font-size: 17px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 4px;
}
.cat-card .cat-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
}
.cat-card .cat-arrow {
  position: absolute;
  right: 16px;
  bottom: 16px;
  color: var(--primary);
  font-weight: 700;
}

/* options */
.quiz-options {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
  margin: 8px 0 32px;
}
.switch {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 14px;
  color: var(--text);
  user-select: none;
}
.switch input { accent-color: var(--primary); transform: scale(1.15); }

/* stats */
.quiz-stats-box {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px 20px;
}
.quiz-stats-box h3 {
  margin: 0 0 12px;
  font-size: 15px;
  color: var(--primary);
}
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 12px;
  font-size: 13.5px;
}
.stat-item {
  text-align: center;
  padding: 10px;
  background: var(--bg-card);
  border-radius: 6px;
  border: 1px solid var(--border);
}
.stat-item .stat-label { font-size: 11px; color: var(--text-muted); display: block; margin-bottom: 4px; }
.stat-item .stat-value { font-size: 20px; font-weight: 700; color: var(--primary); }

/* ---------- Quiz running ---------- */
.quiz-progress-bar {
  margin-bottom: 20px;
}
.progress-info {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 8px;
  font-size: 14px;
  color: var(--text-muted);
}
.cat-badge {
  background: var(--primary);
  color: #fff;
  padding: 4px 12px;
  border-radius: 16px;
  font-size: 12px;
  font-weight: 600;
}
#timerValue { font-family: 'Courier New', monospace; font-weight: 700; color: var(--accent); }
.progress-track {
  height: 6px;
  background: var(--bg-soft);
  border-radius: 3px;
  overflow: hidden;
}
#progressFill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  width: 10%;
  transition: width .3s ease;
}

.question-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.04);
}
.question-card h2 {
  font-size: 19px;
  line-height: 1.6;
  color: var(--text);
  margin: 0 0 20px;
  font-weight: 600;
}
.choices {
  list-style: none;
  padding: 0;
  margin: 0;
}
.choices li {
  margin-bottom: 10px;
}
.choice-btn {
  width: 100%;
  text-align: left;
  padding: 14px 16px;
  background: var(--bg);
  border: 1.5px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  font-family: inherit;
  font-size: 14.5px;
  color: var(--text);
  transition: all .15s;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  line-height: 1.5;
}
.choice-btn:hover:not(:disabled) {
  border-color: var(--primary);
  background: var(--bg-soft);
}
.choice-btn .choice-letter {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 8px;
  font-weight: 700;
  font-size: 12.5px;
  color: var(--primary);
  flex-shrink: 0;
}
.choice-btn.selected {
  border-color: var(--primary);
  background: rgba(31, 78, 121, 0.08);
}
.choice-btn.correct {
  border-color: #16a34a;
  background: rgba(22, 163, 74, 0.1);
}
.choice-btn.correct .choice-letter {
  background: #16a34a;
  color: #fff;
  border-color: #16a34a;
}
.choice-btn.wrong {
  border-color: var(--accent);
  background: rgba(192, 0, 0, 0.08);
}
.choice-btn.wrong .choice-letter {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.choice-btn:disabled { cursor: default; }

.explanation {
  margin-top: 18px;
  padding: 14px 16px;
  background: var(--bg-soft);
  border-left: 4px solid var(--primary-light);
  border-radius: 4px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--text);
}
.explanation strong { color: var(--primary); }

.quiz-actions {
  margin-top: 20px;
  display: flex;
  gap: 10px;
  justify-content: flex-end;
}
.btn-primary, .btn-secondary {
  padding: 10px 18px;
  border-radius: 8px;
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all .15s;
  text-decoration: none;
  display: inline-block;
  text-align: center;
}
.btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.btn-primary:hover:not(:disabled) { background: var(--primary-light); border-color: var(--primary-light); }
.btn-primary:disabled { opacity: 0.45; cursor: not-allowed; }
.btn-secondary {
  background: var(--bg-card);
  color: var(--primary);
  border-color: var(--primary);
}
.btn-secondary:hover { background: var(--bg-soft); }

/* ---------- Result ---------- */
.result-hero {
  text-align: center;
  padding: 32px 16px;
  background: linear-gradient(135deg, var(--bg-soft), var(--bg));
  border-radius: 12px;
  margin-bottom: 24px;
}
.result-emoji { font-size: 56px; margin-bottom: 12px; }
.result-hero h1 {
  font-size: 48px;
  color: var(--primary);
  margin: 0 0 8px;
  font-weight: 800;
}
.result-meta {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-top: 16px;
  font-size: 13.5px;
  color: var(--text-muted);
}

.result-percentile {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 24px;
}
.result-percentile h3 {
  margin: 0 0 16px;
  color: var(--primary);
  font-size: 16px;
}
.percentile-bar {
  position: relative;
  height: 36px;
  background: linear-gradient(90deg, #fee2e2, #fef9c3, #d1fae5);
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 10px;
}
.percentile-fill {
  position: absolute;
  top: 0; bottom: 0;
  background: rgba(31, 78, 121, 0.15);
  border-right: 3px solid var(--primary);
  transition: width 1s cubic-bezier(.34,1.56,.64,1);
}
.percentile-label {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  right: 10px;
  font-weight: 700;
  color: var(--primary);
  font-size: 14px;
}
.percentile-info {
  margin: 0;
  font-size: 13px;
  color: var(--text-muted);
  text-align: center;
}

.result-radar {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 24px;
  text-align: center;
}
.result-radar h3 {
  margin: 0 0 16px;
  color: var(--primary);
  font-size: 16px;
}
#radarChart { max-width: 100%; height: auto; }

.result-review {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 24px;
}
.result-review h3 {
  margin: 0 0 16px;
  color: var(--primary);
  font-size: 16px;
}
.review-item {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  margin-bottom: 10px;
  font-size: 13.5px;
  line-height: 1.55;
}
.review-item.correct { border-left: 4px solid #16a34a; }
.review-item.wrong { border-left: 4px solid var(--accent); }
.review-item .rv-q { font-weight: 600; color: var(--text); margin-bottom: 8px; }
.review-item .rv-mark { float: right; font-weight: 700; }
.review-item .rv-mark.ok { color: #16a34a; }
.review-item .rv-mark.no { color: var(--accent); }
.review-item .rv-ans { font-size: 12.5px; color: var(--text-muted); margin: 4px 0; }
.review-item .rv-exp { font-size: 12.5px; color: var(--text-muted); border-top: 1px dashed var(--border); padding-top: 8px; margin-top: 8px; }

.result-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  margin: 24px 0;
}

/* ---------- mobile ---------- */
@media (max-width: 600px) {
  .quiz-hero h1 { font-size: 26px; }
  .result-hero h1 { font-size: 38px; }
  .question-card { padding: 18px; }
  .question-card h2 { font-size: 16px; }
  .choice-btn { font-size: 13.5px; padding: 12px 14px; }
  .quiz-actions { flex-direction: column; }
  .quiz-actions button { width: 100%; }
}