/* css/components/question-nav.css */

/* ---- Question navigation row ---- */
.question-nav-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 12px 0 16px;
  margin-bottom: 0;
  border-bottom: none;
}

.question-nav-cell {
  min-width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 2px solid var(--border-light);
  background: #f8fafc;
  color: var(--text-medium);
  font-weight: 700;
  font-size: 0.85rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.18s;
  padding: 0 6px;
}

.question-nav-cell:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: #eff6ff;
  transform: translateY(-1px);
}

.question-nav-cell.answered {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.question-nav-cell.correct {
  background: var(--correct);
  border-color: var(--correct);
  color: #fff;
}

.question-nav-cell.incorrect {
  background: var(--incorrect);
  border-color: var(--incorrect);
  color: #fff;
}

.question-nav-cell.unanswered-checked {
  border-color: var(--text-light);
  color: var(--text-light);
  opacity: 0.6;
}

/* ---- Explanation mode styles ---- */
.question-nav-row.explanation-mode .question-nav-cell {
  border-color: #f97316;
  color: #f97316;
}

.question-nav-row.explanation-mode .question-nav-cell:hover {
  background: #fff7ed;
  border-color: #ea580c;
  color: #ea580c;
  transform: translateY(-1px);
}

.question-nav-cell.explanation-active {
  background: #f97316 !important;
  border-color: #f97316 !important;
  color: #fff !important;
}

/* ---- Bottom question panel overlay ---- */
#question-nav-overlay {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: auto;
  background: transparent !important;
  pointer-events: none;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  z-index: 21000;
}

.question-nav-panel {
  pointer-events: auto;
  background: white;
  width: 100%;
  max-width: 860px;
  max-height: 55vh;
  overflow-y: auto;
  border-radius: 12px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
  border: 1px solid #e2e8f0;
  padding: 20px 24px 28px;
  box-sizing: border-box;
  animation: qnav-slide-up 0.25s ease;
}

@keyframes qnav-slide-up {
  from { transform: translateY(100%); }
  to   { transform: translateY(0); }
}

.qnav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 15px;
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 2px solid transparent;
  border-image: linear-gradient(90deg, var(--primary), var(--secondary)) 1;
}

.qnav-header-main {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
  min-width: 0;
}

.qnav-title {
  background: #2D2E5F;
  color: white;
  padding: 5px 15px;
  border-radius: 20px;
  font-weight: bold;
  font-size: 1.1rem;
}

.qnav-close-btn {
  background: none;
  border: none;
  color: var(--text-light);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
  transition: all 0.15s;
}

.qnav-close-btn:hover {
  color: var(--text-dark);
  background: var(--bg-light, #f8fafc);
}

.qnav-body {
  /* inner content area */
}

.qnav-question-text {
  color: var(--text-medium);
  font-size: 0.95rem;
  margin: 0 0 14px;
  line-height: 1.5;
}

.qnav-question-text-header {
  margin: 0;
  font-size: 1.08rem;
  color: #1f2937;
  font-weight: 600;
}

/* Part 5: full-width option rows */
.qnav-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.qnav-option {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: #f8fafc;
  border: 2px solid var(--border-light);
  border-radius: 10px;
  padding: 12px 15px;
  margin-bottom: 8px;
  text-align: left;
  cursor: pointer;
  transition: all 0.18s;
  font-size: 0.9rem;
  color: var(--text-dark);
}

.qnav-option:hover:not(.disabled) {
  border-color: var(--primary);
  background: #eff6ff;
}

.qnav-option.selected {
  border-color: var(--primary);
  background: #eff6ff;
}

.qnav-option.correct {
  border-color: var(--correct);
  background: #ecfdf5;
  color: var(--correct);
}

.qnav-option.incorrect {
  border-color: var(--incorrect);
  background: #fef2f2;
  color: var(--incorrect);
}

.qnav-option.disabled {
  cursor: default;
}

.qnav-option-letter {
  font-weight: 800;
  font-size: 1rem;
  min-width: 20px;
  flex-shrink: 0;
}

.qnav-option-text {
  font-size: 1.15rem;
  line-height: 1.5;
  color: #334155;
}

/* Parts 6, 7, 8: grid of letter buttons */
.qnav-opts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(70px, 1fr));
  gap: 12px;
}

.qnav-opts-grid-part8 {
  grid-template-columns: repeat(4, minmax(70px, 90px));
  justify-content: center;
}

.qnav-opt-btn {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 14px 8px;
  border-radius: 10px;
  font-weight: 800;
  font-size: 1rem;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.18s;
  letter-spacing: 0.5px;
}

.qnav-opt-btn:hover:not(.disabled) {
  background: var(--primary-light);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(45, 46, 95, 0.3);
}

.qnav-opt-btn.selected {
  background: var(--primary-light);
  box-shadow: 0 2px 8px rgba(45, 46, 95, 0.35);
}

.qnav-opt-btn.correct {
  background: var(--correct);
}

.qnav-opt-btn.incorrect {
  background: var(--incorrect);
}

.qnav-opt-btn.disabled {
  cursor: default;
  opacity: 0.85;
}

.qnav-opt-btn.used {
  background: #9ca3af;
}

.qnav-opt-btn.used:hover {
  background: #6b7280;
}

@media (max-width: 480px) {
  .question-nav-panel {
    max-height: calc(70dvh - env(safe-area-inset-bottom));
    border-radius: 18px 18px 0 0;
    padding: 16px 14px max(18px, env(safe-area-inset-bottom));
  }

  #question-nav-overlay .qnav-title {
    font-size: 0.88rem;
    padding: 4px 10px;
  }

  #question-nav-overlay .qnav-option {
    font-size: 0.82rem;
    padding: 10px 12px;
    border-radius: 8px;
  }

  #question-nav-overlay .qnav-option-text {
    font-size: 0.88rem;
    line-height: 1.45;
  }

  #question-nav-overlay .qnav-option-letter {
    font-size: 0.85rem;
    min-width: 1rem;
  }

  #question-nav-overlay .qnav-question-text-header {
    font-size: 0.82rem;
    line-height: 1.35;
    margin-top: 4px;
    display: block;
    font-weight: 600;
  }

  #question-nav-overlay .qnav-header-main {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .qnav-opt-btn.selected {
    box-shadow: none;
  }

  .qnav-header {
    align-items: flex-start;
  }

  .question-nav-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(42px, 1fr));
  }

  .question-nav-cell {
    min-height: 42px;
  }

  .qnav-options-grid {
    grid-template-columns: 1fr;
  }
}