/* exam.css - Giao diện Tạo bài kiểm tra & Màn hình Làm bài liên tục trên 1 trang */
.config-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 1.25rem;
}
.config-section {
  margin-bottom: 1.35rem;
}
.config-label {
  display: block;
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 0.55rem;
}
.checkbox-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.chip-option {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: var(--bg-surface);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  user-select: none;
  transition: all 0.15s;
}
.chip-option:hover {
  border-color: var(--primary-500);
  color: var(--primary-600);
}
.chip-option.selected {
  background: var(--primary-50);
  border-color: var(--primary-500);
  color: var(--primary-600);
  box-shadow: 0 0 0 1px var(--primary-500);
}

/* Bộ điều khiển đồng bộ Ô nhập số & Thanh kéo (Lỗi 3) */
.custom-control-bar {
  margin-top: 0.7rem;
  padding: 0.75rem 0.95rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 0.9rem;
  flex-wrap: wrap;
}
.custom-control-bar.is-custom-focused {
  border-color: var(--primary-500);
  background: var(--primary-50);
}
.custom-number-input {
  width: 96px;
  padding: 0.45rem 0.65rem;
  border-radius: 8px;
  border: 1.5px solid var(--border-strong);
  background: var(--bg-surface);
  font-weight: 700;
  font-size: 0.95rem;
  text-align: center;
  color: var(--primary-600);
  transition: border-color 0.15s, box-shadow 0.15s;
}
.custom-number-input:focus {
  border-color: var(--primary-500);
  box-shadow: 0 0 0 3px var(--primary-100);
}
.custom-range-slider {
  flex: 1;
  min-width: 150px;
  height: 6px;
  accent-color: var(--primary-500);
  background: var(--border-strong);
  border-radius: 999px;
  cursor: pointer;
}

/* Màn hình làm bài (Exam & Practice Workspace) */
.workspace-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 310px;
  gap: 1.25rem;
  align-items: start;
}
.workspace-top-bar {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 0.9rem 1.25rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.timer-box {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-sm);
  background: var(--primary-50);
  color: var(--primary-600);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1rem;
}
.timer-box.warning {
  background: var(--danger-50);
  color: var(--danger-600);
  animation: pulse 1s infinite;
}

/* Phân nhóm theo Part & Đề liên tục trên một trang (Lỗi 1 & Lỗi 2) */
.workspace-part-section {
  margin-bottom: 2rem;
}
.workspace-part-banner {
  background: var(--gradient-soft);
  border: 1px solid var(--primary-200);
  border-left: 5px solid var(--primary-500);
  border-radius: var(--radius-md);
  padding: 0.9rem 1.25rem;
  margin-bottom: 1.15rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.workspace-test-group {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-sm);
}
.workspace-test-group-header {
  padding-bottom: 0.75rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.workspace-questions-stack {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* Khung bài đọc (Passage Container) hiển thị toàn bộ liên tục, không cuộn riêng (Lỗi 2.A) */
.passage-container {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem 1.2rem;
  margin-bottom: 1.25rem;
  max-height: none !important;
  height: auto !important;
  overflow: visible !important;
  overflow-y: visible !important;
  font-size: 0.96rem;
  line-height: 1.8;
  position: relative;
}
.passage-header {
  position: static;
  background: transparent;
  padding: 0 0 0.65rem;
  margin-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.6rem;
}
.passage-header-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.passage-header-actions {
  display: none !important;
}
.btn-passage-toggle {
  display: none !important;
}
.passage-body {
  color: var(--text-primary);
  word-break: break-word;
}
.passage-text-content {
  white-space: pre-line;
}

/* Ô trống Cloze Test (Part V) */
.cloze-blank {
  display: inline-flex;
  align-items: center;
  gap: 0.28rem;
  padding: 0.08rem 0.55rem;
  margin: 0.08rem 0.16rem;
  border-radius: 6px;
  font-weight: 700;
  font-size: 0.88rem;
  line-height: 1.4;
  border: 1.5px dashed var(--primary-500);
  background: var(--bg-surface);
  color: var(--primary-600);
  cursor: pointer;
  vertical-align: baseline;
  transition: all 0.2s ease;
  user-select: none;
  scroll-margin-top: calc(var(--header-height) + 28px);
}
.cloze-blank:hover {
  border-style: solid;
  background: var(--primary-50);
  transform: translateY(-1px);
}
.cloze-blank.is-current {
  background: var(--primary-500);
  color: #ffffff;
  border: 1.5px solid var(--primary-600);
  box-shadow: 0 2px 8px rgba(79, 70, 229, 0.32);
}
.cloze-blank.is-answered:not(.is-current) {
  background: var(--primary-50);
  color: var(--primary-700);
  border: 1.5px solid var(--primary-500);
}
.cloze-blank.is-correct {
  background: var(--success-600);
  color: #ffffff;
  border: 1.5px solid var(--success-600);
}
.cloze-blank.is-wrong {
  background: var(--danger-500);
  color: #ffffff;
  border: 1.5px solid var(--danger-600);
}
.cloze-blank-num {
  font-weight: 800;
}
.cloze-blank-val {
  font-weight: 600;
  text-decoration: none;
}

/* Thẻ từng câu hỏi & hiệu ứng cuộn mượt + làm nổi bật (Lỗi 2.C) */
.question-card-item {
  scroll-margin-top: calc(var(--header-height) + 24px);
  transition: border-color 0.25s ease, box-shadow 0.25s ease, background-color 0.25s ease;
}
.question-card-item.is-active-question {
  border-color: var(--primary-500);
}
@keyframes highlightPulse {
  0% {
    box-shadow: 0 0 0 0 rgba(79, 70, 229, 0.45);
    border-color: var(--primary-500);
  }
  50% {
    box-shadow: 0 0 0 6px rgba(79, 70, 229, 0.18);
    border-color: var(--primary-600);
  }
  100% {
    box-shadow: var(--shadow-sm);
  }
}
.question-highlight-flash {
  animation: highlightPulse 1.3s ease-out;
  border-color: var(--primary-500) !important;
}
.cloze-context-snippet {
  background: var(--bg-elevated);
  border-left: 3px solid var(--primary-500);
  padding: 0.55rem 0.85rem;
  border-radius: 6px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.passage-item-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  margin-bottom: 0.65rem;
}
.passage-item-card:last-child {
  margin-bottom: 0;
}
.question-image-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.65rem;
  background: var(--bg-elevated);
  padding: 1rem;
  border-radius: var(--radius-md);
  margin-bottom: 1.1rem;
  border: 1px solid var(--border-color);
}
.question-image-box img {
  max-height: 320px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  background: #fff;
  padding: 0.35rem;
}
.options-list {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin: 0.85rem 0 0.5rem;
}
.option-btn {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  width: 100%;
  text-align: left;
  padding: 0.85rem 1.05rem;
  border-radius: var(--radius-md);
  border: 2px solid var(--border-color);
  background: var(--bg-surface);
  transition: all 0.16s ease;
  font-size: 0.94rem;
}
.option-btn:hover:not(:disabled) {
  border-color: var(--primary-500);
  background: var(--primary-50);
}
.option-key {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: var(--bg-elevated);
  color: var(--text-secondary);
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  border: 1px solid var(--border-strong);
}
.option-btn.selected {
  border-color: var(--primary-500);
  background: var(--primary-50);
}
.option-btn.selected .option-key {
  background: var(--primary-500);
  color: #fff;
  border-color: var(--primary-500);
}
.option-btn.correct {
  border-color: var(--success-500);
  background: var(--success-50);
}
.option-btn.correct .option-key {
  background: var(--success-500);
  color: #fff;
  border-color: var(--success-500);
}
.option-btn.wrong {
  border-color: var(--danger-500);
  background: var(--danger-50);
}
.option-btn.wrong .option-key {
  background: var(--danger-500);
  color: #fff;
  border-color: var(--danger-600);
}

/* Bảng điều hướng số câu cố định bên phải (Lỗi 2.B) */
.nav-palette-card {
  position: sticky;
  top: calc(var(--header-height) + 1rem);
  max-height: calc(100vh - var(--header-height) - 2rem);
  overflow-y: auto;
  z-index: 20;
}
.palette-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.45rem;
  margin: 0.85rem 0;
}
.palette-cell {
  height: 36px;
  border-radius: 8px;
  font-size: 0.82rem;
  font-weight: 700;
  border: 1px solid var(--border-strong);
  background: var(--bg-surface);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: all 0.15s;
}
.palette-cell:hover {
  border-color: var(--primary-500);
  color: var(--primary-600);
}
.palette-cell.current {
  outline: 2px solid var(--primary-500);
  outline-offset: 1px;
  font-weight: 800;
}
.palette-cell.answered {
  background: var(--primary-500);
  color: #fff;
  border-color: var(--primary-500);
}
.palette-cell.flagged::after {
  content: '';
  position: absolute;
  top: 3px;
  right: 3px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--warning-500);
}
.palette-cell.correct {
  background: var(--success-500);
  color: #fff;
  border-color: var(--success-500);
}
.palette-cell.wrong {
  background: var(--danger-500);
  color: #fff;
  border-color: var(--danger-500);
}