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

/* ---- Question navigation row ---- */
.question-nav-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 10px 0 14px;
  margin-bottom: 0;
  border-bottom: none;
}

.question-nav-row-letters {
  flex-wrap: wrap;
  gap: 8px;
}

/* Duolingo-style 3D cells (B1 Reading Part 2 reference) */
.question-nav-cell,
.question-nav-cell.question-nav-letter {
  min-width: 42px;
  height: 42px;
  border-radius: 14px;
  border: 2px solid var(--ex-duo-border, #e5e5e5);
  background: #fff;
  box-shadow: 0 3px 0 var(--ex-duo-border, #e5e5e5);
  color: var(--ex-duo-text, #4b4b4b);
  font-family: 'Fredoka', 'Nunito', sans-serif;
  font-weight: 800;
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, border-color 0.15s, box-shadow 0.1s, transform 0.1s, color 0.15s;
  padding: 0 8px;
}

.question-nav-cell:hover {
  background: var(--ex-duo-blue-light, #ddf4ff);
  border-color: var(--ex-duo-blue, #1cb0f6);
  box-shadow: 0 3px 0 var(--ex-duo-blue-dark, #1899d6);
  color: var(--ex-duo-blue-dark, #1899d6);
  transform: translateY(-1px);
}

.question-nav-cell:active {
  transform: translateY(2px);
  box-shadow: 0 1px 0 var(--ex-duo-border, #e5e5e5);
}

.question-nav-cell.answered {
  background: var(--ex-duo-blue-light, #ddf4ff);
  border-color: var(--ex-duo-blue, #1cb0f6);
  box-shadow: 0 3px 0 var(--ex-duo-blue-dark, #1899d6);
  color: var(--ex-duo-blue-dark, #1899d6);
}

.question-nav-cell.correct {
  background: #58cc02;
  border-color: #58a700;
  box-shadow: 0 3px 0 #58a700;
  color: #fff;
}

.question-nav-cell.incorrect {
  background: #ff4b4b;
  border-color: #ea2b2b;
  box-shadow: 0 3px 0 #ea2b2b;
  color: #fff;
}

.question-nav-cell.unanswered-checked {
  background: #ff4b4b;
  border-color: #ea2b2b;
  box-shadow: 0 3px 0 #ea2b2b;
  color: #fff;
  opacity: 1;
}

.question-nav-cell.show-correct {
  background: var(--ex-duo-purple, #ce82ff);
  border-color: var(--ex-duo-purple-dark, #a855f7);
  box-shadow: 0 3px 0 var(--ex-duo-purple-dark, #a855f7);
  color: #fff;
}

.question-nav-cell.correct:hover,
.question-nav-cell.incorrect:hover,
.question-nav-cell.unanswered-checked:hover,
.question-nav-cell.show-correct:hover {
  transform: translateY(-1px);
}

/* ---- Explanation mode styles ---- */
.question-nav-row.explanation-mode .question-nav-cell:not(.correct):not(.incorrect):not(.unanswered-checked):not(.show-correct) {
  border: 2px solid var(--ex-duo-border, #e5e5e5);
  background: #fff;
  box-shadow: 0 3px 0 var(--ex-duo-border, #e5e5e5);
  color: var(--ex-duo-text, #4b4b4b);
}

.question-nav-row.explanation-mode .question-nav-cell:not(.correct):not(.incorrect):not(.unanswered-checked):not(.show-correct):hover {
  background: var(--ex-duo-purple-light, #f3e8ff);
  border-color: var(--ex-duo-purple, #ce82ff);
  box-shadow: 0 3px 0 var(--ex-duo-purple-dark, #a855f7);
  color: var(--ex-duo-purple-dark, #a855f7);
  transform: translateY(-1px);
}

/* Keep correct/incorrect colours on non-active question cells in explanation mode */
.question-nav-row.explanation-mode .question-nav-cell.correct:not(.explanation-active) {
  background: #58cc02;
  border-color: #58a700;
  box-shadow: 0 3px 0 #58a700;
  color: #fff;
}

.question-nav-row.explanation-mode .question-nav-cell.incorrect:not(.explanation-active),
.question-nav-row.explanation-mode .question-nav-cell.unanswered-checked:not(.explanation-active) {
  background: #ff4b4b;
  border-color: #ea2b2b;
  box-shadow: 0 3px 0 #ea2b2b;
  color: #fff;
}

.question-nav-row.explanation-mode .question-nav-cell.show-correct:not(.explanation-active) {
  background: var(--ex-duo-purple, #ce82ff);
  border-color: var(--ex-duo-purple-dark, #a855f7);
  box-shadow: 0 3px 0 var(--ex-duo-purple-dark, #a855f7);
  color: #fff;
}

.question-nav-row.explanation-mode .question-nav-cell.correct:not(.explanation-active):hover {
  background: #58cc02;
  border-color: #58a700;
  box-shadow: 0 3px 0 #58a700;
  color: #fff;
  transform: translateY(-1px);
}

.question-nav-row.explanation-mode .question-nav-cell.incorrect:not(.explanation-active):hover,
.question-nav-row.explanation-mode .question-nav-cell.unanswered-checked:not(.explanation-active):hover {
  background: #ff4b4b;
  border-color: #ea2b2b;
  box-shadow: 0 3px 0 #ea2b2b;
  color: #fff;
  transform: translateY(-1px);
}

.question-nav-row.explanation-mode .question-nav-cell.show-correct:not(.explanation-active):hover {
  background: var(--ex-duo-purple, #ce82ff);
  border-color: var(--ex-duo-purple-dark, #a855f7);
  box-shadow: 0 3px 0 var(--ex-duo-purple-dark, #a855f7);
  color: #fff;
  transform: translateY(-1px);
}

.question-nav-cell.explanation-active {
  background: var(--ex-duo-purple, #ce82ff) !important;
  border-color: var(--ex-duo-purple-dark, #a855f7) !important;
  box-shadow: 0 3px 0 var(--ex-duo-purple-dark, #a855f7) !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: #fff;
  width: 100%;
  max-width: 860px;
  max-height: 55vh;
  overflow-y: auto;
  border: 2px solid var(--ex-duo-border, #e5e5e5);
  border-bottom: none;
  border-radius: 20px 20px 0 0;
  box-shadow: 0 -4px 0 var(--ex-duo-border, #e5e5e5);
  padding: 18px 22px max(22px, env(safe-area-inset-bottom));
  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: 16px;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--ex-duo-border, #e5e5e5);
}

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

.qnav-title {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 42px;
  height: 42px;
  padding: 0 14px;
  border-radius: 14px;
  background: var(--ex-duo-blue, #1cb0f6);
  color: #fff;
  font-family: 'Fredoka', 'Nunito', sans-serif;
  font-weight: 800;
  font-size: 1.1rem;
  box-shadow: 0 3px 0 var(--ex-duo-blue-dark, #1899d6);
}

.qnav-close-btn {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  border: 2px solid var(--ex-duo-border, #e5e5e5);
  background: #fff;
  box-shadow: 0 3px 0 var(--ex-duo-border, #e5e5e5);
  color: #afafaf;
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.qnav-header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.qnav-collapse-btn {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  border: 2px solid var(--ex-duo-border, #e5e5e5);
  background: #fff;
  box-shadow: 0 3px 0 var(--ex-duo-border, #e5e5e5);
  color: #afafaf;
  font-size: 1.1rem;
  cursor: pointer;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.qnav-collapse-btn:hover {
  background: var(--ex-duo-blue-light, #ddf4ff);
  border-color: var(--ex-duo-blue, #1cb0f6);
  color: var(--ex-duo-blue-dark, #1899d6);
}

.question-nav-panel.qnav-collapsed {
  max-height: none;
  overflow: hidden;
}

.question-nav-panel.qnav-collapsed .qnav-body {
  display: none;
}

.question-nav-panel.qnav-collapsed .qnav-header {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.qnav-close-btn:hover {
  background: #fff5f5;
  border-color: #fca5a5;
  color: var(--incorrect, #ff4b4b);
}

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

.qnav-question-text {
  color: var(--ex-duo-text, #4b4b4b);
  font-family: 'Fredoka', 'Nunito', sans-serif;
  font-weight: 700;
  font-size: 1.05rem;
  margin: 0 0 14px;
  line-height: 1.5;
}

.qnav-question-text-header {
  margin: 0;
  font-size: 1.05rem;
  color: var(--ex-duo-text, #4b4b4b);
  font-weight: 700;
}

/* 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: #fff;
  border: 2px solid var(--ex-duo-border, #e5e5e5);
  border-radius: 14px;
  box-shadow: 0 3px 0 var(--ex-duo-border, #e5e5e5);
  padding: 12px 15px;
  margin-bottom: 0;
  text-align: left;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, box-shadow 0.1s, transform 0.1s;
  font-size: 0.9rem;
  color: var(--ex-duo-text, #3c3c3c);
}

.qnav-option:hover:not(.disabled) {
  background: var(--ex-duo-blue-light, #ddf4ff);
  border-color: var(--ex-duo-blue, #1cb0f6);
  box-shadow: 0 3px 0 var(--ex-duo-blue-dark, #1899d6);
  transform: translateY(-1px);
}

.qnav-option.selected {
  border-color: var(--ex-duo-blue, #1cb0f6);
  background: var(--ex-duo-blue-light, #ddf4ff);
  box-shadow: 0 3px 0 var(--ex-duo-blue-dark, #1899d6);
}

.qnav-option.correct {
  border-color: #58cc02;
  background: #ecfdf5;
  box-shadow: 0 3px 0 #58a700;
  color: #166534;
}

.qnav-option.incorrect {
  border-color: #ff4b4b;
  background: #fef2f2;
  box-shadow: 0 3px 0 #ea2b2b;
  color: #991b1b;
}

.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: 1.05rem;
  line-height: 1.5;
  color: var(--ex-duo-text, #3c3c3c);
}

/* 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(--ex-duo-blue, #1cb0f6);
  color: #fff;
  border: 2px solid var(--ex-duo-blue-dark, #1899d6);
  padding: 14px 8px;
  border-radius: 14px;
  font-family: 'Fredoka', 'Nunito', sans-serif;
  font-weight: 800;
  font-size: 1rem;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s, box-shadow 0.1s;
  letter-spacing: 0.5px;
  box-shadow: 0 3px 0 var(--ex-duo-blue-dark, #1899d6);
}

.qnav-opt-btn:hover:not(.disabled) {
  background: #47c4ff;
  transform: translateY(-1px);
}

.qnav-opt-btn:active:not(.disabled) {
  transform: translateY(2px);
  box-shadow: 0 1px 0 var(--ex-duo-blue-dark, #1899d6);
}

.qnav-opt-btn.selected {
  background: var(--ex-duo-blue-light, #ddf4ff);
  color: var(--ex-duo-blue-dark, #1899d6);
  border-color: var(--ex-duo-blue, #1cb0f6);
  box-shadow: 0 3px 0 var(--ex-duo-blue-dark, #1899d6);
}

.qnav-opt-btn.correct {
  background: #58cc02;
  border-color: #58a700;
  box-shadow: 0 3px 0 #58a700;
  color: #fff;
}

.qnav-opt-btn.incorrect {
  background: #ff4b4b;
  border-color: #ea2b2b;
  box-shadow: 0 3px 0 #ea2b2b;
  color: #fff;
}

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

.qnav-opt-btn.used {
  background: #e5e5e5;
  border-color: #afafaf;
  box-shadow: 0 3px 0 #afafaf;
  color: #777;
}

.qnav-opt-btn.used:hover {
  background: #d4d4d4;
}

/* B1 Reading Part 4 — compact letter row in question panel */
.question-nav-panel.qnav-b1r4 {
  max-width: 420px;
  padding: 14px 16px max(18px, env(safe-area-inset-bottom));
}

.qnav-b1r4 .qnav-header {
  margin-bottom: 12px;
  padding-bottom: 10px;
}

.qnav-b1r4 .qnav-title {
  min-width: 38px;
  height: 38px;
  padding: 0 12px;
  font-size: 1rem;
}

.qnav-b1r4 .qnav-close-btn,
.qnav-b1r4 .qnav-collapse-btn {
  width: 38px;
  height: 38px;
}

.qnav-b1r4 .qnav-opts-grid-b1r4 {
  display: flex;
  flex-wrap: nowrap;
  justify-content: center;
  align-items: center;
  gap: 6px;
  padding: 4px 0 2px;
}

.qnav-b1r4 .qnav-opt-btn {
  flex: 0 0 auto;
  min-width: 0;
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: 12px;
  font-size: 0.82rem;
  letter-spacing: 0;
  text-transform: none;
  background: #fff;
  color: var(--ex-duo-text, #4b4b4b);
  border: 2px solid var(--ex-duo-border, #e5e5e5);
  box-shadow: 0 2px 0 var(--ex-duo-border, #e5e5e5);
}

.qnav-b1r4 .qnav-opt-btn:hover:not(.disabled):not(.selected) {
  background: var(--ex-duo-blue-light, #ddf4ff);
  border-color: var(--ex-duo-blue, #1cb0f6);
  box-shadow: 0 2px 0 var(--ex-duo-blue-dark, #1899d6);
  color: var(--ex-duo-blue-dark, #1899d6);
  transform: translateY(-1px);
}

.qnav-b1r4 .qnav-opt-btn:active:not(.disabled) {
  transform: translateY(1px);
  box-shadow: 0 1px 0 var(--ex-duo-border, #e5e5e5);
}

.qnav-b1r4 .qnav-opt-btn.selected {
  background: var(--ex-duo-blue, #1cb0f6);
  color: #fff;
  border-color: var(--ex-duo-blue-dark, #1899d6);
  box-shadow: 0 2px 0 var(--ex-duo-blue-dark, #1899d6);
}

.qnav-b1r4 .qnav-opt-btn.used {
  background: #f7f7f7;
  border-color: #dcdcdc;
  box-shadow: 0 2px 0 #dcdcdc;
  color: #b0b0b0;
}

.qnav-b1r4 .qnav-opt-btn.used:hover:not(.disabled) {
  background: #efefef;
  transform: none;
}

@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-panel.qnav-b1r4 {
    max-width: 100%;
    padding: 12px 12px max(16px, env(safe-area-inset-bottom));
  }

  .qnav-b1r4 .qnav-opts-grid-b1r4 {
    gap: 4px;
  }

  .qnav-b1r4 .qnav-opt-btn {
    width: 40px;
    height: 40px;
    font-size: 0.85rem;
    border-radius: 11px;
  }

  #question-nav-overlay .qnav-title {
    font-size: 0.95rem;
    min-width: 38px;
    height: 38px;
    padding: 0 12px;
  }

  #question-nav-overlay .qnav-close-btn,
  #question-nav-overlay .qnav-collapse-btn {
    width: 38px;
    height: 38px;
  }

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

  #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: 0.9rem;
    line-height: 1.35;
    margin-top: 4px;
    display: block;
    font-weight: 700;
  }

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

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

  .question-nav-row {
    gap: 6px;
  }

  .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;
  }
}