/* ==========================================================================
   KHẢO THÍ VIỆT - PHÒNG THI TRỰC TUYẾN & CÁC THÀNH PHẦN KHẢO THÍ
   Thiết kế chuẩn phòng thi quốc gia: trang nghiêm, rõ ràng, không phân tâm
   ========================================================================== */

/* ==========================================================================
   EXAM ROOM WRAPPER & HEADER
   ========================================================================== */
.exam-room-wrapper {
  background-color: var(--bg-primary);
  min-height: calc(100vh - 120px);
  display: flex;
  flex-direction: column;
}

.exam-room-header {
  background-color: var(--bg-surface);
  border-bottom: 2px solid var(--border-color);
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 57px;
  z-index: 90;
  box-shadow: var(--shadow-sm);
  gap: 20px;
}

.exam-header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.btn-text-back {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-family: var(--font-main);
  font-size: 13px;
  font-weight: 600;
  padding: 7px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s;
}

.btn-text-back:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
}

.badge-school {
  font-size: 11px;
  font-weight: 700;
  color: var(--primary-navy);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.exam-main-title {
  font-size: 17px;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.3;
}

.exam-sub-info {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 3px;
}

.info-pill {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.exam-header-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* ĐỒNG HỒ ĐẾM NGƯỢC CHUẨN KHẢO THÍ */
.exam-clock-card {
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 6px 14px;
  text-align: center;
  min-width: 140px;
}

.clock-label {
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  display: block;
}

.clock-time {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 800;
  color: var(--primary-navy);
  line-height: 1.2;
}

.clock-time.urgent {
  color: var(--accent-crimson);
  animation: pulse-urgent 1s infinite;
}

@keyframes pulse-urgent {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.timer-progress-track {
  height: 4px;
  background-color: var(--border-color);
  border-radius: 2px;
  margin-top: 4px;
  overflow: hidden;
}

.timer-progress-fill {
  height: 100%;
  background-color: var(--primary-navy);
  transition: width 1s linear;
}

.btn-submit-exam {
  background-color: var(--bg-surface);
  color: var(--primary-navy);
  border: 1.5px solid var(--border-subtle);
  font-family: var(--font-main);
  font-size: 13.5px;
  font-weight: 750;
  padding: 9px 16px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  box-shadow: var(--shadow-sm);
  transition: all 0.15s ease;
}

.btn-submit-exam:hover {
  background-color: var(--primary-navy-surface);
  border-color: var(--primary-navy-light);
  color: var(--primary-navy-light);
}

.btn-submit-exam:hover {
  background-color: #991b1b;
}

/* ==========================================================================
   EXAM ROOM BODY: 2 COLUMNS
   ========================================================================== */
.exam-room-body {
  display: flex;
  max-width: 1240px;
  margin: 0 auto;
  padding: 24px 20px 60px 20px;
  gap: 28px;
  width: 100%;
}

.exam-questions-scroll {
  flex: 1;
  min-width: 0;
}

.exam-part-banner {
  margin: 24px 0 16px 0;
}

.exam-part-banner:first-child {
  margin-top: 0;
}

.part-title {
  font-size: 15px;
  font-weight: 800;
  color: var(--primary-navy);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.part-divider {
  height: 2px;
  background-color: var(--border-color);
  margin-top: 6px;
}

/* THẺ CÂU HỎI TRONG PHÒNG THI */
.question-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.question-card.highlight-pulse {
  border-color: var(--primary-navy);
  box-shadow: 0 0 0 2px var(--primary-navy-surface);
}

.question-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.q-badge-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.q-number {
  font-size: 15px;
  font-weight: 800;
  color: var(--primary-navy);
}

.q-points {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 600;
}

.q-topic {
  background-color: var(--bg-subtle);
  color: var(--text-secondary);
  font-size: 11.5px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
}

.btn-flag {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-family: var(--font-main);
  font-size: 12px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: all 0.15s;
}

.btn-flag.flagged {
  background-color: var(--accent-amber-bg);
  border-color: var(--accent-amber);
  color: var(--accent-amber);
}

.question-prompt {
  font-size: 16.5px;
  line-height: 1.65;
  color: var(--text-primary);
  margin-bottom: 18px;
  font-weight: 450;
}

.question-prompt p {
  margin-bottom: 8px;
}

/* LỰA CHỌN A, B, C, D */
.options-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.option-card {
  background-color: var(--bg-subtle);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 14px;
  cursor: pointer;
  user-select: none;
  transition: all 0.15s ease;
}

.option-card:hover {
  background-color: var(--bg-hover);
  border-color: var(--border-subtle);
}

.option-card input[type="radio"] {
  display: none;
}

.option-key {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background-color: var(--bg-surface);
  border: 1.5px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 13px;
  color: var(--text-secondary);
  flex-shrink: 0;
  transition: all 0.15s;
}

.option-text {
  font-size: 15px;
  color: var(--text-primary);
  line-height: 1.4;
}

.option-card.selected {
  background-color: var(--primary-navy-surface);
  border-color: var(--primary-navy);
}

.option-card.selected .option-key {
  background-color: var(--primary-navy);
  border-color: var(--primary-navy);
  color: #FFFFFF;
}

/* BẢNG ĐÚNG / SAI (PART II) */
.tf-table-container {
  overflow-x: auto;
}

.tf-question-table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
}

.tf-question-table th {
  background-color: var(--bg-subtle);
  padding: 10px 14px;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-color);
  text-align: left;
}

.tf-question-table th.col-action {
  width: 80px;
  text-align: center;
}

.tf-question-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border-color);
  font-size: 14.5px;
}

.tf-question-table td.action-cell {
  text-align: center;
}

.btn-tf {
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-color);
  font-family: var(--font-main);
  font-size: 12.5px;
  font-weight: 700;
  padding: 6px 14px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s;
  color: var(--text-secondary);
}

.btn-tf:hover {
  background-color: var(--bg-hover);
}

.btn-tf.btn-true.active {
  background-color: var(--accent-emerald);
  color: #FFFFFF;
  border-color: var(--accent-emerald);
}

.btn-tf.btn-false.active {
  background-color: var(--accent-crimson);
  color: #FFFFFF;
  border-color: var(--accent-crimson);
}

/* TRẢ LỜI NGẮN (PART III) */
.short-answer-box {
  background-color: var(--bg-subtle);
  padding: 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.sa-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-secondary);
  display: block;
  margin-bottom: 8px;
}

.sa-input {
  background-color: var(--bg-surface);
  border: 1.5px solid var(--border-color);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  width: 100%;
  max-width: 320px;
  outline: none;
}

.sa-input:focus {
  border-color: var(--border-focus);
}

.sa-hint {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 6px;
}

/* BÀI TẬP TỰ LUẬN */
.essay-box {
  background-color: var(--bg-subtle);
  padding: 16px;
  border-radius: var(--radius-sm);
}

.essay-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-secondary);
  display: block;
  margin-bottom: 8px;
}

.essay-textarea {
  width: 100%;
  background-color: var(--bg-surface);
  border: 1.5px solid var(--border-color);
  color: var(--text-primary);
  font-family: var(--font-main);
  font-size: 14.5px;
  line-height: 1.6;
  padding: 12px;
  border-radius: var(--radius-sm);
  outline: none;
  resize: vertical;
}

.essay-note {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12.5px;
  color: var(--primary-navy);
  margin-top: 8px;
  font-weight: 500;
}

/* ==========================================================================
   PALETTE SIDEBAR: PHIẾU TÔ CÂU HỎI
   ========================================================================== */
.exam-palette-sidebar {
  width: 300px;
  flex-shrink: 0;
}

.palette-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  position: sticky;
  top: 154px;
  box-shadow: var(--shadow-sm);
}

.palette-header {
  margin-bottom: 12px;
}

.palette-header h3 {
  font-size: 15px;
  font-weight: 800;
  color: var(--text-primary);
}

.palette-stat {
  font-size: 12.5px;
  color: var(--primary-navy);
  font-weight: 700;
}

.palette-legend {
  display: flex;
  gap: 10px;
  padding: 8px 0;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.legend-item {
  font-size: 11px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
}

.legend-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.dot-answered { background-color: var(--primary-navy); }
.dot-flagged { background-color: var(--accent-amber); }
.dot-empty { background-color: var(--border-subtle); }

.palette-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  margin-bottom: 18px;
}

.palette-btn {
  height: 38px;
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--text-secondary);
  cursor: pointer;
  position: relative;
  transition: all 0.15s;
}

.palette-btn:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
}

.palette-btn.answered {
  background-color: var(--primary-navy);
  color: #FFFFFF;
  border-color: var(--primary-navy);
}

.palette-btn.flagged {
  border-color: var(--accent-amber);
  background-color: var(--accent-amber-bg);
  color: var(--accent-amber);
}

.palette-btn.flagged.answered {
  background-color: var(--primary-navy);
  border: 2px solid var(--accent-amber);
  color: #FFFFFF;
}

.palette-flag-icon {
  position: absolute;
  top: 1px;
  right: 2px;
  font-size: 8px;
  color: var(--accent-amber);
}

.btn-primary-action {
  background-color: var(--primary-navy);
  color: #FFFFFF;
  border: none;
  font-family: var(--font-main);
  font-size: 13.5px;
  font-weight: 700;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: background-color 0.15s;
}

.btn-primary-action:hover {
  background-color: #1d4ed8;
}

.btn-primary-action.full-width {
  width: 100%;
}

.btn-secondary-action {
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-family: var(--font-main);
  font-size: 13px;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-secondary-action:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
}

/* ==========================================================================
   RESULT VIEWER & REPORT CARD
   ========================================================================== */
.result-page-wrapper {
  max-width: 1000px;
  margin: 0 auto;
  padding: 24px 20px 80px 20px;
}

.result-top-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.result-top-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.report-card {
  background-color: var(--bg-surface);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-md);
  margin-bottom: 36px;
  position: relative;
}

.report-header {
  display: flex;
  align-items: center;
  gap: 16px;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 20px;
  margin-bottom: 24px;
}

.school-national-seal {
  width: 56px;
  height: 56px;
  background-color: var(--primary-navy-surface);
  border: 2px solid var(--primary-navy);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-navy);
}

.school-national-seal .icon {
  font-size: 32px;
}

.report-sup-title {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--text-muted);
}

.report-title {
  font-size: 24px;
  font-weight: 800;
  color: var(--text-primary);
  margin-top: 2px;
}

.report-subtitle {
  font-size: 14px;
  color: var(--text-secondary);
}

.report-summary-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 32px;
  align-items: center;
}

.score-spotlight-box {
  background: linear-gradient(135deg, var(--primary-navy-surface) 0%, var(--bg-surface) 100%);
  border: 1.5px solid var(--primary-navy);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
}

.score-label {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.8px;
  color: var(--primary-navy);
  display: block;
}

.big-score-display {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
  margin: 8px 0;
}

.score-num {
  font-size: 54px;
  font-weight: 900;
  font-family: var(--font-mono);
  color: var(--primary-navy);
  line-height: 1;
}

.score-max {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-muted);
}

.rank-pill {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 12.5px;
  font-weight: 800;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.rank-excellent { background-color: var(--accent-emerald-bg); color: var(--accent-emerald); }
.rank-good { background-color: var(--primary-navy-surface); color: var(--primary-navy); }
.rank-fair { background-color: var(--accent-amber-bg); color: var(--accent-amber); }
.rank-pass { background-color: var(--bg-subtle); color: var(--text-secondary); }
.rank-average { background-color: var(--accent-crimson-bg); color: var(--accent-crimson); }

.teacher-comment {
  font-size: 12.5px;
  font-style: italic;
  color: var(--text-secondary);
  line-height: 1.5;
}

.metrics-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.metric-item {
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 14px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.metric-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.metric-icon.correct { background-color: var(--accent-emerald-bg); color: var(--accent-emerald); }
.metric-icon.incorrect { background-color: var(--accent-crimson-bg); color: var(--accent-crimson); }
.metric-icon.skipped { background-color: var(--bg-hover); color: var(--text-muted); }
.metric-icon.time { background-color: var(--primary-navy-surface); color: var(--primary-navy); }

.metric-val {
  font-size: 20px;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--text-primary);
  display: block;
  line-height: 1.2;
}

.metric-name {
  font-size: 12px;
  color: var(--text-muted);
}

.mistake-sync-banner {
  margin-top: 24px;
  background-color: var(--accent-amber-bg);
  border: 1.5px solid var(--accent-amber);
  border-radius: var(--radius-sm);
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.banner-left {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--accent-amber);
}

.banner-left p {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 2px;
}

.btn-accent-action {
  background-color: var(--accent-amber);
  color: #FFFFFF;
  border: none;
  font-family: var(--font-main);
  font-size: 13px;
  font-weight: 700;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

/* REVIEW QUESTIONS SECTION */
.review-questions-section {
  margin-top: 36px;
}

.section-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 12px;
}

.section-title-row h2 {
  font-size: 18px;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-primary);
}

.filter-review-pills {
  display: flex;
  gap: 6px;
}

.pill-btn {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  font-family: var(--font-main);
  font-size: 12.5px;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: 14px;
  color: var(--text-secondary);
  cursor: pointer;
}

.pill-btn.active {
  background-color: var(--primary-navy);
  color: #FFFFFF;
  border-color: var(--primary-navy);
}

.review-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
}

.review-card.card-correct {
  border-left: 4px solid var(--accent-emerald);
}

.review-card.card-incorrect {
  border-left: 4px solid var(--accent-crimson);
}

.review-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
}

.q-title-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.q-num {
  font-weight: 800;
  color: var(--text-primary);
  font-size: 15px;
}

.q-topic-tag {
  font-size: 11px;
  color: var(--text-muted);
  background-color: var(--bg-subtle);
  padding: 2px 8px;
  border-radius: 4px;
}

.review-status-badge {
  font-size: 12px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.review-status-badge.correct { background-color: var(--accent-emerald-bg); color: var(--accent-emerald); }
.review-status-badge.incorrect { background-color: var(--accent-crimson-bg); color: var(--accent-crimson); }
.review-status-badge.skipped { background-color: var(--bg-hover); color: var(--text-muted); }

.review-prompt {
  font-size: 15px;
  color: var(--text-primary);
  line-height: 1.6;
  margin-bottom: 16px;
}

.answer-comparison-box {
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 14px;
  margin-bottom: 16px;
}

.ans-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.ans-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-muted);
  display: block;
  margin-bottom: 4px;
}

.ans-value {
  font-size: 14.5px;
  font-weight: 600;
}

.col-correct .ans-value { color: var(--accent-emerald); }
.col-wrong .ans-value { color: var(--accent-crimson); }
.col-official .ans-value { color: var(--primary-navy); }

/* BẢNG ĐỐI CHIẾU ĐÚNG SAI REVIEW */
.tf-review-table-wrapper {
  overflow-x: auto;
}

.tf-review-table {
  width: 100%;
  border-collapse: collapse;
}

.tf-review-table th, .tf-review-table td {
  padding: 8px 10px;
  font-size: 13px;
  border-bottom: 1px solid var(--border-color);
}

.row-sub-correct { background-color: var(--accent-emerald-bg); }
.row-sub-wrong { background-color: var(--accent-crimson-bg); }

.good-icon { color: var(--accent-emerald); }
.bad-icon { color: var(--accent-crimson); }

.explanation-box {
  background-color: var(--primary-navy-surface);
  border-left: 3px solid var(--primary-navy);
  padding: 14px 18px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 12px;
}

.exp-title {
  font-size: 13px;
  font-weight: 800;
  color: var(--primary-navy);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 5px;
}

.exp-content {
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-primary);
}

.trap-alert-box {
  background-color: var(--accent-amber-bg);
  border-left: 3px solid var(--accent-amber);
  padding: 12px 18px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.trap-title {
  font-size: 13px;
  font-weight: 800;
  color: var(--accent-amber);
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 5px;
}

.trap-text {
  font-size: 13.5px;
  color: var(--text-primary);
  line-height: 1.5;
}

/* ==========================================================================
   MISTAKE BOOK (SỔ TAY CÂU SAI)
   ========================================================================== */
.mistake-book-wrapper {
  max-width: 1000px;
  margin: 0 auto;
  padding: 24px 20px 80px 20px;
}

.mistake-header {
  margin-bottom: 24px;
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11.5px;
  font-weight: 700;
  color: var(--accent-crimson);
  background-color: var(--accent-crimson-bg);
  padding: 3px 8px;
  border-radius: 4px;
  margin-bottom: 8px;
}

.main-heading {
  font-size: 26px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.sub-heading {
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.mistake-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 14px;
  flex-wrap: wrap;
  gap: 12px;
}

.subject-chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.chip-btn {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  font-family: var(--font-main);
  font-size: 13px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 20px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s;
}

.chip-btn.active {
  background-color: var(--primary-navy);
  color: #FFFFFF;
  border-color: var(--primary-navy);
}

.stat-badge {
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 5px;
}

.mistake-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
  transition: opacity 0.2s;
}

.mistake-card.resolved {
  opacity: 0.65;
  background-color: var(--bg-subtle);
}

.mistake-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 10px;
  flex-wrap: wrap;
  gap: 8px;
}

.meta-tags {
  display: flex;
  align-items: center;
  gap: 8px;
}

.meta-tag {
  font-size: 11px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 4px;
}

.tag-subject { background-color: var(--primary-navy-surface); color: var(--primary-navy); }
.tag-exam { background-color: var(--bg-subtle); color: var(--text-muted); }
.meta-date { font-size: 11px; color: var(--text-muted); }

.card-top-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-resolve-toggle {
  background: transparent;
  border: 1px solid var(--border-color);
  font-family: var(--font-main);
  font-size: 12px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--text-secondary);
}

.btn-resolve-toggle.is-resolved {
  background-color: var(--accent-emerald-bg);
  border-color: var(--accent-emerald);
  color: var(--accent-emerald);
}

.btn-delete-mistake {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
}

.btn-delete-mistake:hover {
  color: var(--accent-crimson);
}

.mistake-prompt {
  margin-bottom: 14px;
}

.q-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.q-text {
  font-size: 15px;
  color: var(--text-primary);
  line-height: 1.5;
}

.mistake-answers-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 14px;
}

.m-ans-box {
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.ans-wrong { background-color: var(--accent-crimson-bg); border-color: rgba(185, 28, 28, 0.2); }
.ans-correct { background-color: var(--accent-emerald-bg); border-color: rgba(21, 128, 61, 0.2); }

.box-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  display: block;
}

.box-val {
  font-size: 13.5px;
  margin-top: 2px;
}

.m-explanation {
  background-color: var(--bg-subtle);
  border-left: 3px solid var(--primary-navy);
  padding: 12px 16px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 10px;
}

.m-trap {
  background-color: var(--accent-amber-bg);
  border-left: 3px solid var(--accent-amber);
  padding: 12px 16px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 14px;
}

.user-note-area {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--border-color);
}

.note-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 4px;
  margin-bottom: 6px;
}

.note-input-row {
  display: flex;
  gap: 8px;
}

.note-input {
  flex: 1;
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-family: var(--font-main);
  font-size: 13px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  outline: none;
}

.btn-save-note {
  background-color: var(--primary-navy);
  color: #FFFFFF;
  border: none;
  font-family: var(--font-main);
  font-size: 12.5px;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.empty-state-box {
  text-align: center;
  padding: 60px 20px;
  background-color: var(--bg-surface);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-md);
}

.empty-icon {
  font-size: 48px;
  color: var(--accent-emerald);
  margin-bottom: 12px;
}

.empty-state-box h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

.empty-state-box p {
  color: var(--text-muted);
  margin-bottom: 18px;
  font-size: 14px;
}

/* ==========================================================================
   CHEAT SHEETS & STUDY PLAN
   ========================================================================== */
.cheat-sheets-wrapper, .study-plan-wrapper {
  padding: 32px 0 80px 0;
}

.cheat-header, .plan-header {
  margin-bottom: 32px;
}

.cheat-cards-stack {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.cheat-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}

.cheat-card-header {
  margin-bottom: 20px;
  border-bottom: 1.5px solid var(--border-color);
  padding-bottom: 14px;
}

.cheat-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  color: var(--accent-crimson);
  background-color: var(--accent-crimson-bg);
  padding: 2px 8px;
  border-radius: 4px;
  margin-bottom: 6px;
}

.cheat-card-header h2 {
  font-size: 20px;
  font-weight: 800;
  color: var(--text-primary);
}

.cheat-section-block {
  margin-bottom: 20px;
}

.cheat-section-block h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--primary-navy);
  margin-bottom: 8px;
}

.markdown-prose {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text-primary);
}

.markdown-prose p { margin-bottom: 8px; }
.markdown-prose li { margin-left: 20px; margin-bottom: 4px; }

/* STUDY PLAN TIMELINE */
.plan-days-timeline {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.timeline-day-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  gap: 20px;
  box-shadow: var(--shadow-sm);
}

.day-circle {
  width: 44px;
  height: 44px;
  background-color: var(--primary-navy);
  color: #FFFFFF;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 800;
  font-family: var(--font-mono);
}

.day-content-col {
  flex: 1;
}

.day-title {
  font-size: 16px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.task-checklist {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 12px;
}

.task-checkbox-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-primary);
  cursor: pointer;
  user-select: none;
}

.task-checkbox-item.done .task-text {
  text-decoration: line-through;
  color: var(--text-muted);
}

.task-input {
  display: none;
}

.custom-check {
  width: 20px;
  height: 20px;
  border: 1.5px solid var(--border-subtle);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: transparent;
  transition: all 0.15s;
}

.task-input:checked + .custom-check {
  background-color: var(--accent-emerald);
  border-color: var(--accent-emerald);
  color: #FFFFFF;
}

.custom-check .icon {
  font-size: 14px;
  font-weight: bold;
}

.day-tip-box {
  background-color: var(--bg-subtle);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-size: 12.5px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.day-tip-box .icon {
  color: var(--accent-amber);
}

/* ==========================================================================
   EXAM TOAST NOTIFICATION
   ========================================================================== */
.exam-toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background-color: #0F172A;
  color: #FFFFFF;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13.5px;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.exam-toast.show {
  transform: translateY(0);
  opacity: 1;
}

.exam-toast.toast-warning {
  background-color: var(--accent-crimson);
}

/* ==========================================================================
   ADVANCED TOOLS: TOOL PILL, KEYBOARD BAR, SCRATCHPAD & MASTERY TIERS
   ========================================================================== */
.btn-tool-pill {
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-family: var(--font-main);
  font-size: 13px;
  font-weight: 600;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s;
}

.btn-tool-pill:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
}

.keyboard-hints-bar {
  background-color: var(--bg-subtle);
  border-bottom: 1px solid var(--border-color);
  padding: 6px 24px;
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.keyboard-hints-bar strong {
  color: var(--primary-navy);
}

.question-card.keyboard-focused {
  border-color: var(--primary-navy);
  box-shadow: 0 0 0 2px var(--primary-navy-surface);
}

/* SCRATCHPAD DRAWER (BẢNG NHÁP ĐIỆN TỬ) */
.scratchpad-drawer {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 580px;
  max-width: 90vw;
  background-color: var(--bg-surface-elevated);
  border: 2px solid var(--primary-navy);
  border-radius: var(--radius-md);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
  z-index: 500;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.scratchpad-drawer.hidden {
  display: none;
}

.scratchpad-header {
  background-color: var(--primary-navy);
  color: #FFFFFF;
  padding: 8px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sp-title {
  font-size: 13px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 6px;
}

.sp-toolbar {
  display: flex;
  align-items: center;
  gap: 6px;
}

.sp-tool-btn {
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #FFFFFF;
  padding: 4px 8px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 12px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.sp-tool-btn.active {
  background-color: #FFFFFF;
  color: var(--primary-navy);
}

#sp-color-picker {
  width: 24px;
  height: 24px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  padding: 0;
  background: transparent;
}

.scratchpad-canvas-wrap {
  background-color: #FFFFFF;
  height: 320px;
  width: 100%;
}

#scratchpad-canvas {
  width: 100%;
  height: 100%;
  cursor: crosshair;
  touch-action: none;
}

/* MASTERY ANALYSIS 4 COGNITIVE TIERS */
.mastery-analysis-section {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px dashed var(--border-color);
}

.mastery-title {
  font-size: 14.5px;
  font-weight: 800;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 14px;
}

.mastery-bars-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.m-bar-card {
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
}

.m-bar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.m-name {
  font-size: 12.5px;
  font-weight: 700;
  color: var(--text-primary);
}

.m-score {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 800;
  color: var(--primary-navy);
}

.m-track {
  height: 6px;
  background-color: var(--border-color);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 6px;
}

.m-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 0.5s ease-out;
}

.rec-fill { background-color: #3B82F6; }
.comp-fill { background-color: #10B981; }
.app-fill { background-color: #F59E0B; }
.adv-fill { background-color: #8B5CF6; }

.m-status {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
}

/* ==========================================================================
   TỐI ƯU TIỂU HỌC: BÀN PHÍM SỐ ẢO, LINH VẬT ĐỒNG HÀNH & GÓC PHỤ HUYNH
   ========================================================================== */

/* 1. NÚT ĐỌC ĐỀ CHO BÉ (SPEECH SYNTHESIS) */
.btn-read-aloud {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background-color: #FEF3C7;
  border: 1px solid #F59E0B;
  color: #B45309;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 700;
  padding: 5px 12px;
  border-radius: 9999px;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-read-aloud:hover {
  background-color: #FDE68A;
  transform: scale(1.02);
}

.btn-read-aloud.reading {
  background-color: #10B981;
  color: #FFFFFF;
  border-color: #059669;
  animation: pulse-read 1s infinite alternate;
}

@keyframes pulse-read {
  from { transform: scale(1); }
  to { transform: scale(1.05); }
}

.q-header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* 2. BÀN PHÍM SỐ TRỰC QUAN CHO BÉ (KID NUMPAD) */
.kid-numpad {
  margin-top: 10px;
  background-color: #F8FAFC;
  border: 1px solid #E2E8F0;
  border-radius: var(--radius-md);
  padding: 8px;
  max-width: 280px;
}

.numpad-row {
  display: flex;
  gap: 6px;
  margin-bottom: 6px;
}

.numpad-row:last-child {
  margin-bottom: 0;
}

.num-key {
  flex: 1;
  height: 42px;
  background-color: #FFFFFF;
  border: 1.5px solid #CBD5E1;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 800;
  color: var(--primary-navy);
  cursor: pointer;
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
  transition: all 0.1s;
  display: flex;
  align-items: center;
  justify-content: center;
  user-select: none;
}

.num-key:hover {
  background-color: #EFF6FF;
  border-color: #3B82F6;
  transform: translateY(-1px);
}

.num-key:active {
  transform: translateY(1px);
  background-color: #DBEAFE;
}

.num-key-op {
  background-color: #FEF3C7;
  color: #B45309;
  border-color: #FCD34D;
}

.num-key-del {
  background-color: #FEE2E2;
  color: #B91C1C;
  border-color: #FCA5A5;
  font-size: 13px;
  font-weight: 700;
}

.num-key-clear {
  background-color: #F1F5F9;
  color: #64748B;
  font-size: 12px;
  font-weight: 700;
}

/* 3. LINH VẬT ĐỒNG HÀNH TRONG PHÒNG THI: CHẾ ĐỘ BẠN HỌC TẬP TRUNG (QUIET STUDY COMPANION) */
.kid-mascot-floating {
  position: fixed;
  bottom: 18px;
  right: 22px;
  z-index: 95;
  display: flex;
  align-items: center;
  gap: 8px;
  pointer-events: auto;
}

.mascot-avatar {
  width: 52px;
  height: 52px;
  background: var(--bg-surface, #FFFFFF);
  border: 2px solid var(--beelio-gold, #F6B91A);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  box-shadow: 0 6px 16px rgba(36, 50, 74, 0.14);
  cursor: pointer;
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.mascot-avatar:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: 0 8px 20px rgba(246, 185, 26, 0.28);
}

.mascot-avatar img {
  width: 90%;
  height: 90%;
  object-fit: contain;
  display: block;
}

.mascot-speech {
  max-width: 210px;
  background-color: rgba(255, 255, 255, 0.96);
  border: 1.5px solid var(--border-color, #D9E2EC);
  border-radius: 12px 12px 2px 12px;
  padding: 8px 12px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-primary, #24324A);
  line-height: 1.35;
  box-shadow: 0 4px 12px rgba(36, 50, 74, 0.08);
  position: relative;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.kid-mascot-floating.quiet-collapsed:not(:hover) .mascot-speech {
  opacity: 0;
  pointer-events: none;
  transform: translateX(8px) scale(0.95);
}

.mascot-speech::after {
  content: '';
  position: absolute;
  bottom: 8px;
  right: -8px;
  width: 0;
  height: 0;
  border-top: 6px solid transparent;
  border-bottom: 6px solid transparent;
  border-left: 8px solid #F59E0B;
}

/* 4. RESULT VIEWER: TABS BÉ VS PHỤ HUYNH & BAREM */
.result-tab-switch {
  display: flex;
  gap: 12px;
  margin: 24px 0 16px 0;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 8px;
}

.result-tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border: 1px solid transparent;
  background-color: transparent;
  border-radius: 8px 8px 0 0;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
}

.result-tab-btn:hover {
  color: var(--primary-navy);
  background-color: var(--bg-hover);
}

.result-tab-btn.active {
  color: var(--primary-navy);
  background-color: #EFF6FF;
  border-color: #BFDBFE #BFDBFE transparent #BFDBFE;
  box-shadow: 0 -2px 0 var(--primary-navy) inset;
}

.badge-new {
  font-size: 10px;
  background-color: #EF4444;
  color: #FFFFFF;
  padding: 2px 6px;
  border-radius: 9999px;
  text-transform: uppercase;
}

.flower-cheer-row {
  font-size: 24px;
  letter-spacing: 4px;
  margin: 6px 0;
}

.kid-cheer-message {
  font-size: 13.5px;
  font-weight: 600;
  color: #047857;
  font-style: italic;
  margin-top: 4px;
}

/* 5. GÓC PHỤ HUYNH & BAREM CHẤM */
.parent-guide-panel {
  background-color: #FFFDF5;
  border: 1.5px solid #FDE68A;
  border-radius: var(--radius-md);
  padding: 20px;
  margin-top: 16px;
}

.parent-card-header {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  border-bottom: 1px dashed #FCD34D;
  padding-bottom: 12px;
  margin-bottom: 16px;
}

.parent-card-header .icon {
  font-size: 28px;
  color: #D97706;
}

.parent-card-header h3 {
  margin: 0 0 4px 0;
  font-size: 16px;
  color: #92400E;
}

.parent-card-header p {
  margin: 0;
  font-size: 12.5px;
  color: #78350F;
}

.parent-diagnostic-box {
  background-color: #FFFFFF;
  border: 1px solid #E2E8F0;
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  margin-bottom: 20px;
}

.parent-diagnostic-box h4 {
  margin: 0 0 12px 0;
  font-size: 13.5px;
  color: #1E293B;
}

.diagnostic-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.diag-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.diag-label {
  font-size: 12px;
  font-weight: 700;
  color: #334155;
}

.diag-bar-track {
  height: 6px;
  background-color: #E2E8F0;
  border-radius: 3px;
  overflow: hidden;
}

.diag-bar-fill {
  height: 100%;
  background-color: #10B981;
  border-radius: 3px;
}

.diag-status {
  font-size: 11px;
  color: #64748B;
  font-weight: 500;
}

.rubric-item-card {
  background-color: #FFFFFF;
  border: 1px solid #CBD5E1;
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  margin-bottom: 10px;
}

.rubric-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  margin-bottom: 6px;
}

.rubric-tag {
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 9999px;
}

.tag-correct {
  background-color: #D1FAE5;
  color: #065F46;
}

.tag-incorrect {
  background-color: #FEE2E2;
  color: #991B1B;
}

.rubric-content p {
  margin: 2px 0;
  font-size: 12.5px;
  color: #334155;
}

.correct-text {
  font-weight: 800;
  color: #1E40AF;
}

.parent-advice-bubble {
  margin-top: 8px;
  background-color: #EFF6FF;
  border-left: 3px solid #3B82F6;
  padding: 6px 10px;
  border-radius: 0 4px 4px 0;
  font-size: 12px;
  color: #1E3A8A;
}

/* 6. GIỎ HOA ĐIỂM 10 TRÊN HEADER */
.gio-hoa-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: linear-gradient(135deg, #FFE4E6, #FECDD3);
  border: 1px solid #FDA4AF;
  color: #BE123C;
  font-size: 12.5px;
  font-weight: 800;
  padding: 4px 12px;
  border-radius: 9999px;
  margin-left: 8px;
  box-shadow: 0 1px 3px rgba(225, 29, 72, 0.15);
}

/* 7. BADGES CHO CÁC MÔN HỌC MỚI */
.badge-subject.subj-his {
  background-color: #FFFBEB;
  color: #B45309;
  border: 1.5px solid #FDE68A;
}

.badge-subject.subj-sci {
  background-color: #ECFEFF;
  color: #0E7490;
  border: 1.5px solid #A5F3FC;
}

.badge-subject.subj-tin {
  background-color: #F3F4F6;
  color: #374151;
  border: 1.5px solid #E5E7EB;
}

.badge-subject.subj-chem {
  background-color: #FFF7ED;
  color: #C2410C;
  border: 1.5px solid #FED7AA;
}

/* ==========================================================================
   TỐI ƯU HÓA GIAO DIỆN & TRẢI NGHIỆM TRÊN MỌI THIẾT BỊ DI ĐỘNG (RESPONSIVE)
   ========================================================================== */

/* Công cụ hiển thị có điều kiện */
.mobile-only-tool {
  display: none !important;
}

.desktop-only-tool {
  display: inline-flex !important;
}

.palette-close-mobile {
  background: none;
  border: none;
  color: #64748B;
  cursor: pointer;
  padding: 4px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.palette-close-mobile:hover {
  background-color: #F1F5F9;
  color: #0F172A;
}

/* MÀN HÌNH MÁY TÍNH BẢNG & ĐIỆN THOẠI (< 900px) */
@media (max-width: 900px) {
  .exam-room-body {
    display: block;
    position: relative;
    padding: 0 !important;
  }

  .exam-questions-scroll {
    width: 100% !important;
    padding: 14px 12px 90px 12px;
  }

  /* Chuyển Bảng Phiếu Trả Lời thành Bottom Drawer trên điện thoại */
  .exam-palette-sidebar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    max-height: 80vh;
    background: #FFFFFF;
    border-top: 2px solid #2563EB;
    border-radius: 20px 20px 0 0;
    box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.25);
    z-index: 1050;
    transform: translateY(110%);
    transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    overflow-y: auto;
    padding: 16px 20px 24px 20px;
  }

  .exam-palette-sidebar.mobile-open {
    transform: translateY(0);
  }

  .palette-card {
    border: none;
    box-shadow: none;
    padding: 0;
  }

  .palette-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
    padding-bottom: 10px;
    border-bottom: 1px solid #E2E8F0;
  }

  .mobile-only-tool {
    display: inline-flex !important;
  }

  .desktop-only-tool {
    display: none !important;
  }
}

/* MÀN HÌNH ĐIỆN THOẠI SMARTPHONE (< 768px) */
@media (max-width: 768px) {
  /* Ẩn thanh gợi ý phím tắt vật lý (vì trên điện thoại không có bàn phím máy tính) */
  .keyboard-hints-bar {
    display: none !important;
  }

  /* Header phòng thi tối ưu cho màn hình nhỏ: ghim sát top, thu gọn diện tích */
  .exam-room-header {
    position: sticky !important;
    top: 0 !important;
    padding: 6px 10px !important;
    gap: 6px !important;
    z-index: 95 !important;
    background-color: var(--bg-surface) !important;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08) !important;
  }

  .exam-header-left {
    gap: 6px !important;
    min-width: 0 !important;
    flex: 1 1 auto !important;
  }

  .btn-text-back {
    padding: 6px 8px !important;
    font-size: 12px !important;
    gap: 2px !important;
    white-space: nowrap !important;
    min-width: 32px !important;
    justify-content: center !important;
  }

  .btn-text-back > span:not(.icon) {
    display: none !important; /* Ẩn chữ 'Thoát' chỉ giữ icon trên điện thoại, bảo toàn .beelio-svg-icon bên trong .icon */
  }

  .exam-meta-title {
    min-width: 0 !important;
    overflow: hidden !important;
    flex: 1 1 auto !important;
  }

  .badge-school {
    font-size: 9.5px !important;
    font-weight: 700 !important;
    white-space: nowrap !important;
    overflow: hidden !important;
    text-overflow: ellipsis !important;
    display: block !important;
    max-width: 140px !important;
    color: var(--primary-navy) !important;
  }

  .exam-main-title {
    font-size: 12px !important;
    font-weight: 700 !important;
    white-space: nowrap !important;
    overflow: hidden !important;
    text-overflow: ellipsis !important;
    max-width: 140px !important;
    margin: 0 !important;
    line-height: 1.2 !important;
    color: var(--text-primary) !important;
  }

  .exam-sub-info {
    display: none !important; /* Ẩn các pill phụ trong tiêu đề phòng thi trên điện thoại */
  }

  .exam-header-right {
    gap: 5px !important;
    flex-shrink: 0 !important;
  }

  .btn-tool-pill {
    padding: 4px 6px !important;
    font-size: 11px !important;
  }

  .btn-tool-pill .tool-label {
    display: none !important; /* Chỉ hiện icon để tiết kiệm diện tích */
  }

  .exam-clock-card {
    padding: 3px 6px !important;
    min-width: 52px !important;
  }

  .clock-label {
    display: none !important;
  }

  .clock-time {
    font-size: 13px !important;
    font-weight: 800 !important;
  }

  .btn-submit-exam {
    background-color: var(--accent-crimson, #DC2626) !important;
    color: #FFFFFF !important;
    padding: 5px 8px !important;
    font-size: 12px !important;
    white-space: nowrap !important;
    border-radius: 6px !important;
    border: none !important;
    box-shadow: 0 2px 4px rgba(220, 38, 38, 0.3) !important;
    display: inline-flex !important;
    align-items: center !important;
    gap: 3px !important;
  }

  .btn-submit-exam .icon {
    font-size: 16px !important;
  }

  /* Câu hỏi & Đáp án chạm bấm to, ngón tay bé dễ bấm */
  .question-card {
    padding: 14px 14px;
    border-radius: 12px;
    margin-bottom: 16px;
  }

  .question-header {
    gap: 8px;
    flex-wrap: wrap;
  }

  .q-number-badge {
    font-size: 12.5px;
    padding: 3px 8px;
  }

  .btn-read-aloud {
    padding: 4px 8px;
    font-size: 11.5px;
  }

  .btn-flag {
    padding: 4px 8px;
    font-size: 11.5px;
  }

  .btn-flag > span:last-child {
    display: none; /* Chỉ hiện icon cờ, bảo toàn .beelio-svg-icon bên trong .icon */
  }

  .prompt-content {
    font-size: 15px;
    line-height: 1.6;
  }

  /* Lựa chọn đáp án A, B, C, D: Nút chạm lớn, rõ ràng */
  .options-grid {
    grid-template-columns: 1fr !important;
    gap: 10px;
  }

  .option-card {
    padding: 12px 14px;
    min-height: 52px;
    border-radius: 10px;
    -webkit-tap-highlight-color: transparent;
  }

  .option-letter {
    width: 32px;
    height: 32px;
    font-size: 14px;
  }

  .option-text {
    font-size: 14.5px;
  }

  /* Bảng Đúng/Sai trên điện thoại: Cho phép cuộn ngang hoặc responsive */
  .tf-table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .table-tf {
    min-width: 320px;
  }

  .btn-tf {
    min-width: 44px;
    min-height: 40px;
    font-size: 13px;
  }

  /* Bàn phím số cho bé trên điện thoại: Nút to, ngón tay dễ bấm */
  .kid-numpad {
    max-width: 100%;
  }

  .numpad-row {
    gap: 8px;
    margin-bottom: 8px;
  }

  .num-key {
    min-height: 48px;
    font-size: 18px;
    font-weight: 700;
    border-radius: 8px;
    -webkit-tap-highlight-color: transparent;
  }

  /* Bảng nháp điện tử trên điện thoại: Trượt từ dưới lên toàn chiều rộng */
  .scratchpad-drawer {
    bottom: 0;
    right: 0;
    left: 0;
    width: 100%;
    max-width: 100%;
    border-radius: 16px 16px 0 0;
    border-bottom: none;
    border-left: none;
    border-right: none;
  }

  .scratchpad-canvas-wrap {
    height: 280px;
  }

  /* Màn hình kết quả bài thi */
  .result-hero-card {
    padding: 20px 14px;
  }

  .score-display-box {
    width: 90px;
    height: 90px;
  }

  .score-number {
    font-size: 32px;
  }

  .result-actions-row {
    flex-direction: column;
    gap: 10px;
  }

  .btn-result-action {
    width: 100%;
    justify-content: center;
  }

  /* Sổ tay ghi nhớ & Lịch học trên điện thoại */
  .cheat-sheets-grid,
  .plan-timeline {
    grid-template-columns: 1fr !important;
  }

  .cheat-sheet-card {
    padding: 16px 14px;
  }
}

/* ==========================================================================
   THEO DÕI TIẾN ĐỘ THI & THỐNG KÊ ĐỀ ĐÃ LÀM (EXAM PROGRESS & REVIEW TRACKER)
   ========================================================================== */

/* 1. THANH TỔNG QUAN TIẾN ĐỘ HỌC TẬP (PROGRESS OVERVIEW STRIP) */
.exam-progress-overview-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
  margin-bottom: 20px;
}

.progress-stat-card {
  background: #FFFFFF;
  border: 1px solid #E2E8F0;
  border-radius: 12px;
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.progress-stat-card:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}

.stat-card-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 22px;
}

.icon-progress {
  background: #EFF6FF;
  color: #2563EB;
}

.icon-average {
  background: #FEF3C7;
  color: #D97706;
}

.icon-mistakes {
  background: #FFF1F2;
  color: #E11D48;
}

.stat-card-info {
  flex: 1;
  min-width: 0;
}

.stat-card-label {
  font-size: 12px;
  font-weight: 600;
  color: #64748B;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  margin-bottom: 2px;
}

.stat-card-value {
  font-size: 18px;
  font-weight: 800;
  color: #0F172A;
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.stat-card-sub {
  font-size: 12px;
  color: #64748B;
  font-weight: normal;
}

.stat-progress-bar {
  height: 6px;
  background: #E2E8F0;
  border-radius: 3px;
  overflow: hidden;
  margin-top: 6px;
}

.stat-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #3B82F6, #10B981);
  border-radius: 3px;
  transition: width 0.4s ease;
}

.btn-link-mistakes {
  background: none;
  border: none;
  color: #2563EB;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  padding: 0;
  display: inline-flex;
  align-items: center;
  gap: 3px;
  margin-top: 3px;
}

.btn-link-mistakes:hover {
  text-decoration: underline;
}

/* 2. BỘ LỌC TRẠNG THÁI ĐỀ THI (STATUS FILTER PILLS) */
.catalog-status-filter-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed #E2E8F0;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  box-sizing: border-box;
}

.status-pill-btn {
  background: #F8FAFC;
  border: 1px solid #CBD5E1;
  color: #475569;
  font-size: 12.5px;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: 20px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: all 0.15s ease;
}

.status-pill-btn:hover {
  background: #F1F5F9;
  border-color: #94A3B8;
  color: #0F172A;
}

.status-pill-btn.active {
  background: #1E40AF;
  border-color: #1E40AF;
  color: #FFFFFF;
  box-shadow: 0 2px 4px rgba(30, 64, 175, 0.2);
}

.status-count-bubble {
  background: rgba(0, 0, 0, 0.08);
  padding: 1px 6px;
  border-radius: 10px;
  font-size: 11px;
  font-weight: 700;
}

.status-pill-btn.active .status-count-bubble {
  background: rgba(255, 255, 255, 0.25);
  color: #FFFFFF;
}

/* 3. HUY HIỆU TRẠNG THÁI ĐỀ TRÊN CARD */
.badge-status-completed {
  background: #DCFCE7;
  color: #15803D;
  border: 1px solid #86EFAC;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  gap: 3px;
}

.badge-status-completed .icon {
  font-size: 13px;
}

.badge-status-unattempted {
  background: #F1F5F9;
  color: #64748B;
  border: 1px solid #E2E8F0;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  gap: 3px;
}

.badge-status-unattempted .icon {
  font-size: 13px;
}

/* 4. DẢI ĐIỂM SỐ & THỐNG KÊ LẦN THI TRÊN CARD (CÓ THỂ BẤM ĐỂ XEM LẠI) */
.exam-completed-strip {
  background: #F8FAFC;
  border-radius: 8px;
  padding: 10px 12px;
  margin: 10px 0;
  border-left: 4px solid #3B82F6;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  transition: all 0.15s ease;
  user-select: none;
}

.exam-completed-strip:hover {
  filter: brightness(0.97);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  transform: translateY(-1px);
}

.exam-completed-strip:active {
  transform: scale(0.99);
}

.review-strip-chevron {
  font-size: 20px;
  color: #64748B;
  flex-shrink: 0;
  transition: transform 0.15s ease;
}

.exam-completed-strip:hover .review-strip-chevron {
  transform: translateX(2px);
  color: #1E40AF;
}

.exam-completed-strip.strip-excellent {
  background: #F0FDF4;
  border-left-color: #10B981;
}

.exam-completed-strip.strip-good {
  background: #EFF6FF;
  border-left-color: #3B82F6;
}

.exam-completed-strip.strip-average {
  background: #FFFBEB;
  border-left-color: #F59E0B;
}

.exam-completed-strip.strip-weak {
  background: #FFF1F2;
  border-left-color: #EF4444;
}

.completed-score-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.score-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 800;
  white-space: nowrap;
}

.score-badge.score-excellent {
  background: #DCFCE7;
  color: #15803D;
  border: 1px solid #86EFAC;
}

.score-badge.score-good {
  background: #DBEAFE;
  color: #1D4ED8;
  border: 1px solid #93C5FD;
}

.score-badge.score-average {
  background: #FEF3C7;
  color: #B45309;
  border: 1px solid #FCD34D;
}

.score-badge.score-weak {
  background: #FEE2E2;
  color: #B91C1C;
  border: 1px solid #FCA5A5;
}

.score-badge .icon {
  font-size: 16px;
}

.completed-stats-meta {
  flex: 1;
  min-width: 0;
}

.stats-line-1 {
  font-size: 13px;
  font-weight: 700;
  color: #0F172A;
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.score-rank-text {
  color: #1E40AF;
}

.best-score-tag {
  font-size: 11.5px;
  font-weight: 600;
  color: #D97706;
}

.stats-line-2 {
  font-size: 11.5px;
  color: #64748B;
  display: flex;
  align-items: center;
  gap: 5px;
  margin-top: 2px;
  flex-wrap: wrap;
}

/* 5. HỘP CẢNH BÁO LỖI SAI & BẪY TRÊN CARD (BẤM VÀO XEM CHI TIẾT NGAY) */
.exam-card-mistakes-box {
  background: #FFFBEB;
  border: 1px solid #FDE68A;
  border-radius: 8px;
  padding: 10px 12px;
  margin: 10px 0;
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
  display: block;
}

.exam-card-mistakes-box:hover {
  background: #FEF3C7;
  border-color: #F59E0B;
  box-shadow: 0 3px 10px rgba(217, 119, 6, 0.15);
  transform: translateY(-1px);
}

.exam-card-mistakes-box:active {
  background: #FDE68A;
  transform: scale(0.99);
}

.mistakes-box-header {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 700;
  color: #92400E;
  margin-bottom: 8px;
}

.mistakes-box-header .icon {
  font-size: 15px;
  color: #D97706;
}

.mistakes-box-header .mistake-box-arrow {
  margin-left: auto;
  font-size: 14px;
  color: #B45309;
}

.mistakes-preview-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.mistake-preview-item {
  font-size: 12px;
  line-height: 1.4;
  color: #451A03;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 8px;
  border-radius: 6px;
  background: rgba(254, 243, 199, 0.5);
  border: 1px solid rgba(253, 230, 138, 0.7);
  cursor: pointer;
  transition: all 0.12s ease;
}

.mistake-preview-item:hover {
  background: #FEF3C7;
  border-color: #F59E0B;
}

.mistake-preview-item .mistake-link-icon {
  margin-left: auto;
  font-size: 16px;
  color: #D97706;
  flex-shrink: 0;
}

.q-num-tag {
  background: #FEF3C7;
  color: #B45309;
  font-weight: 700;
  font-size: 11px;
  padding: 1px 5px;
  border-radius: 4px;
  flex-shrink: 0;
}

.q-topic-tag {
  font-weight: 600;
  color: #1E293B;
}

.q-trap-alert {
  font-size: 11px;
  color: #DC2626;
  font-style: italic;
  display: inline-flex;
  align-items: center;
  gap: 2px;
}

.q-trap-alert .icon {
  font-size: 12px;
}

.more-mistakes-row {
  font-size: 11.5px;
  color: #B45309;
  font-style: italic;
  font-weight: 700;
  text-decoration: underline;
  padding: 4px 6px;
  cursor: pointer;
}

/* Hiệu ứng nhấp nháy làm nổi bật câu hỏi mục tiêu khi bấm từ Card đề */
@keyframes pulseHighlight {
  0% { box-shadow: 0 0 0 0 rgba(37, 99, 235, 0.6); }
  50% { box-shadow: 0 0 0 8px rgba(37, 99, 235, 0); }
  100% { box-shadow: 0 0 0 0 rgba(37, 99, 235, 0); }
}

.highlight-target-question {
  animation: pulseHighlight 1.5s ease-out 2 !important;
  border-color: #2563EB !important;
  background: #EFF6FF !important;
}

.exam-card-perfect-box {
  background: #F0FDF4;
  border: 1px solid #86EFAC;
  color: #166534;
  border-radius: 8px;
  padding: 8px 12px;
  margin: 10px 0;
  font-size: 12.5px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
}

.exam-card-perfect-box .icon {
  color: #10B981;
  font-size: 16px;
}

/* 6. NÚT HÀNH ĐỘNG TRÊN CARD ĐÃ HOÀN THÀNH */
.completed-footer {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.btn-review-exam {
  flex: 1.2;
  background: #2563EB;
  color: #FFFFFF;
  border: none;
  font-size: 12.5px;
  font-weight: 700;
  padding: 8px 10px;
  border-radius: 6px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  transition: background 0.15s ease;
}

.btn-review-exam:hover {
  background: #1D4ED8;
}

.btn-retake-exam {
  flex: 1;
  background: #F8FAFC;
  color: #334155;
  border: 1px solid #CBD5E1;
  font-size: 12.5px;
  font-weight: 600;
  padding: 8px 10px;
  border-radius: 6px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  transition: all 0.15s ease;
}

.btn-retake-exam:hover {
  background: #E2E8F0;
  color: #0F172A;
}

@media (max-width: 768px) {
  .exam-progress-overview-strip {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .completed-footer {
    flex-direction: column;
  }

  .btn-review-exam,
  .btn-retake-exam,
  .completed-footer .btn-print-exam {
    width: 100%;
    justify-content: center;
  }
}