/* ============================================================
   quiz.css — Interactive Quiz Styles
   Computing and AI Ethics, Brendan Shea PhD

   Depends on: styles.css (provides CSS custom properties)
   Used by:    quiz_NN.html pages

   Table of contents
   -----------------
   1.  Quiz shell & layout
   2.  Start screen
   3.  Progress bar
   4.  Question card
   5.  Option buttons
   6.  Feedback area
   7.  Results screen
   8.  Score circle
   9.  Breakdown table
  10.  Shared buttons
  11.  Utility & states
  12.  Responsive
  13.  Print
   ============================================================ */


/* ============================================================
   1. QUIZ SHELL & LAYOUT
   ============================================================ */
#quiz-app {
  max-width: 720px;
  margin: 0 auto;
  padding: var(--gap-lg) var(--gap-md);
  font-family: var(--font-body);
}

/* Give every quiz section room to breathe */
.qz-start,
.qz-results {
  display: flex;
  flex-direction: column;
  gap: var(--gap-md);
}


/* ============================================================
   2. START SCREEN
   ============================================================ */
.qz-meta {
  font-family: var(--font-ui);
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--chapter-color, var(--blue-mid));
  margin-bottom: 0;
}

.qz-title {
  /* Override the h1 border-bottom from styles.css */
  border-bottom: none !important;
  margin-top: 0 !important;
  font-size: clamp(1.4rem, 4vw, 1.9rem);
  color: var(--blue-dark);
}

.qz-description {
  font-size: 1rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
}
.qz-description + p { text-indent: 0; }

/* Previous-attempt badge */
.qz-prev-result {
  display: inline-flex;
  align-items: baseline;
  gap: .5rem;
  background: var(--blue-xlight);
  border: 1px solid var(--blue-light);
  border-radius: var(--radius);
  padding: .55rem 1rem;
  font-family: var(--font-ui);
  font-size: .88rem;
  width: fit-content;
}
.qz-prev-score {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--chapter-color, var(--blue-mid));
}
.qz-prev-label {
  color: var(--color-text-muted);
}

.qz-start-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  align-items: center;
}

.qz-tip {
  font-family: var(--font-ui);
  font-size: .8rem;
  color: var(--gray-mid);
  margin-bottom: 0;
}
.qz-tip + p { text-indent: 0; }

kbd {
  display: inline-block;
  padding: .1em .35em;
  font-family: var(--font-mono);
  font-size: .82em;
  background: var(--gray-light);
  border: 1px solid var(--color-border);
  border-radius: 3px;
  line-height: 1.4;
}


/* ============================================================
   3. PROGRESS BAR
   ============================================================ */
.qz-progress {
  position: relative;
  height: 8px;
  background: var(--gray-light);
  border-radius: 99px;
  margin-bottom: var(--gap-sm);
  overflow: visible;
}

.qz-progress-fill {
  height: 100%;
  background: var(--chapter-color, var(--blue-mid));
  border-radius: 99px;
  transition: width .35s ease;
  min-width: 4px;
}

.qz-progress-label {
  font-family: var(--font-ui);
  font-size: .78rem;
  color: var(--gray-mid);
  text-align: right;
  margin-top: .3rem;
  margin-bottom: var(--gap-sm);
}
.qz-progress-label + p { text-indent: 0; }


/* ============================================================
   4. QUESTION CARD
   ============================================================ */
.qz-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--gap-lg) var(--gap-lg);
  box-shadow: var(--shadow-sm);
}

.qz-question {
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--blue-dark);
  line-height: 1.5;
  margin-bottom: var(--gap-md);
  font-family: var(--font-ui);
}
.qz-question + p { text-indent: 0; }

.qz-options {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: .55rem;
}

.qz-options li {
  margin: 0;
}


/* ============================================================
   5. OPTION BUTTONS
   ============================================================ */
.qz-option {
  display: flex;
  align-items: flex-start;
  gap: .75rem;
  width: 100%;
  padding: .65rem .9rem;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
  font-family: var(--font-body);
  font-size: .97rem;
  color: var(--color-text);
  line-height: 1.5;
  text-align: left;
  transition: border-color .15s, background .15s, box-shadow .15s;
}

.qz-option:hover:not(:disabled) {
  border-color: var(--chapter-color, var(--blue-mid));
  background: var(--chapter-light, var(--blue-xlight));
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--chapter-color, var(--blue-mid)) 15%, transparent);
}

.qz-option:focus-visible {
  outline: 3px solid var(--chapter-color, var(--blue-mid));
  outline-offset: 2px;
}

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

/* Letter badge (A, B, C, D) */
.qz-letter {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.6rem;
  height: 1.6rem;
  border-radius: 50%;
  background: var(--gray-light);
  color: var(--gray-dark);
  font-family: var(--font-ui);
  font-size: .78rem;
  font-weight: 700;
  transition: background .15s, color .15s;
}

.qz-option:hover:not(:disabled) .qz-letter {
  background: var(--chapter-color, var(--blue-mid));
  color: #fff;
}

/* Correct answer state */
.qz-option.qz-correct {
  border-color: var(--green-mid);
  background: var(--green-light);
}
.qz-option.qz-correct .qz-letter {
  background: var(--green-mid);
  color: #fff;
}

/* Incorrect (chosen) state */
.qz-option.qz-incorrect {
  border-color: var(--red-mid);
  background: var(--red-light);
}
.qz-option.qz-incorrect .qz-letter {
  background: var(--red-mid);
  color: #fff;
}

.qz-opt-text {
  flex: 1;
}


/* ============================================================
   6. FEEDBACK AREA
   ============================================================ */
.qz-feedback {
  margin-top: var(--gap-md);
}

.qz-feedback-header {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: 1rem;
  padding: .55rem .9rem;
  border-radius: var(--radius);
  margin-bottom: .6rem;
}

.qz-fb-correct {
  background: var(--green-light);
  color: var(--green-dark);
  border: 1px solid var(--green-mid);
}

.qz-fb-incorrect {
  background: var(--red-light);
  color: var(--red-dark);
  border: 1px solid var(--red-mid);
}

.qz-fb-icon {
  font-size: 1.15rem;
  line-height: 1;
}

.qz-explanation {
  font-size: .93rem;
  color: var(--color-text);
  line-height: 1.65;
  margin-bottom: 0;
}
.qz-explanation + p { text-indent: 0; }

.qz-review-link {
  display: inline-block;
  margin-left: .25rem;
  font-family: var(--font-ui);
  font-size: .82rem;
  font-weight: 600;
  color: var(--chapter-color, var(--blue-mid));
  white-space: nowrap;
}

.qz-advance {
  margin-top: var(--gap-md);
}


/* ============================================================
   7. RESULTS SCREEN
   ============================================================ */
.qz-score-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--gap-sm);
  padding: var(--gap-lg) 0;
}

.qz-score-msg {
  font-family: var(--font-ui);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--blue-dark);
  margin-bottom: 0;
}
.qz-score-msg + p { text-indent: 0; }

.qz-overall {
  font-family: var(--font-ui);
  font-size: .88rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
}
.qz-overall + p { text-indent: 0; }

.qz-result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  align-items: center;
  padding-top: var(--gap-sm);
}


/* ============================================================
   8. SCORE CIRCLE
   ============================================================ */
.qz-score-circle {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  border: 5px solid currentColor;
  line-height: 1;
}

.qz-sc-great { color: var(--green-mid); }
.qz-sc-ok    { color: var(--gold-mid);  }
.qz-sc-low   { color: var(--red-mid);   }

.qz-sc-num {
  font-family: var(--font-ui);
  font-size: 2.6rem;
  font-weight: 700;
  color: inherit;
  display: block;
}

.qz-sc-denom {
  font-family: var(--font-ui);
  font-size: .85rem;
  color: var(--color-text-muted);
  display: block;
}


/* ============================================================
   9. BREAKDOWN TABLE
   ============================================================ */
.qz-breakdown-wrap {
  width: 100%;
}

.qz-breakdown-heading {
  font-size: 1rem;
  margin-top: 0 !important;
  margin-bottom: var(--gap-sm) !important;
  padding-bottom: .3rem;
  border-bottom: 2px solid var(--chapter-color, var(--blue-mid)) !important;
}

.qz-breakdown {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-ui);
  font-size: .88rem;
}

.qz-breakdown thead th {
  background: var(--blue-dark);
  color: #fff;
  padding: .45rem .7rem;
  text-align: left;
  font-weight: 600;
}

.qz-breakdown tbody tr {
  border-bottom: 1px solid var(--gray-light);
}

.qz-breakdown tbody tr:last-child {
  border-bottom: none;
}

.qz-row-ok   { background: var(--green-xlight); }
.qz-row-miss { background: var(--red-xlight);   }

.qz-breakdown td {
  padding: .55rem .7rem;
  vertical-align: top;
}

.qz-bd-status {
  text-align: center;
  font-size: 1rem;
  width: 2rem;
}

.qz-row-ok   .qz-bd-status { color: var(--green-mid); }
.qz-row-miss .qz-bd-status { color: var(--red-mid);   }

.qz-bd-q {
  color: var(--color-text);
  line-height: 1.45;
}

.qz-bd-ans {
  color: var(--color-text);
  min-width: 120px;
}

.qz-bd-wrong {
  color: var(--red-mid);
  text-decoration: line-through;
  display: block;
}

.qz-bd-right {
  color: var(--green-dark);
  font-weight: 600;
  display: block;
}


/* ============================================================
  10. SHARED BUTTONS
   ============================================================ */
.qz-btn {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .55rem 1.2rem;
  border: 2px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-ui);
  font-size: .9rem;
  font-weight: 600;
  line-height: 1.3;
  cursor: pointer;
  text-decoration: none;
  transition: background .15s, border-color .15s, box-shadow .15s, opacity .15s;
  white-space: nowrap;
}

.qz-btn:hover { text-decoration: none; opacity: .88; }

.qz-btn:focus-visible {
  outline: 3px solid var(--chapter-color, var(--blue-mid));
  outline-offset: 2px;
}

.qz-btn-primary {
  background: var(--chapter-color, var(--blue-mid));
  color: #fff;
  border-color: var(--chapter-color, var(--blue-mid));
}

.qz-btn-secondary {
  background: transparent;
  color: var(--chapter-color, var(--blue-mid));
  border-color: var(--chapter-color, var(--blue-mid));
}

.qz-btn-ghost {
  background: transparent;
  color: var(--color-text-muted);
  border-color: var(--color-border);
}

.qz-badge {
  display: inline-block;
  background: rgba(255,255,255,.25);
  border-radius: 99px;
  padding: .05em .5em;
  font-size: .8em;
  font-weight: 600;
  letter-spacing: .02em;
}

.qz-btn-secondary .qz-badge {
  background: color-mix(in srgb, var(--chapter-color, var(--blue-mid)) 12%, transparent);
}

.qz-btn-ghost .qz-badge {
  background: var(--gray-light);
  color: var(--gray-mid);
}


/* ============================================================
  10b. TYPE TAG (Matching / Select-all label)
   ============================================================ */
.qz-type-tag {
  display: inline-block;
  margin-bottom: var(--gap-sm);
  padding: .2em .65em;
  background: var(--blue-xlight);
  border: 1px solid var(--blue-light);
  border-radius: 99px;
  font-family: var(--font-ui);
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--blue-mid);
}


/* ============================================================
  10c. MULTIPLE RESPONSE (checkboxes)
   ============================================================ */
.qz-checkboxes {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: .5rem;
}

.qz-checkboxes li { margin: 0; }

.qz-cb-label {
  display: flex;
  align-items: flex-start;
  gap: .65rem;
  padding: .6rem .85rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
  font-family: var(--font-body);
  font-size: .97rem;
  color: var(--color-text);
  line-height: 1.5;
  transition: border-color .15s, background .15s;
}

.qz-cb-label:hover {
  border-color: var(--chapter-color, var(--blue-mid));
  background: var(--chapter-light, var(--blue-xlight));
}

/* Hide the native checkbox visually while keeping it accessible */
.qz-cb-input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

/* Custom square checkbox */
.qz-cb-box {
  flex-shrink: 0;
  width: 1.1rem;
  height: 1.1rem;
  margin-top: .15rem;
  border: 2px solid var(--color-border);
  border-radius: 3px;
  background: var(--color-surface);
  transition: border-color .15s, background .15s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.qz-cb-input:checked + .qz-cb-box {
  background: var(--chapter-color, var(--blue-mid));
  border-color: var(--chapter-color, var(--blue-mid));
}

/* Checkmark inside box */
.qz-cb-input:checked + .qz-cb-box::after {
  content: '';
  display: block;
  width: .35rem;
  height: .6rem;
  border: 2px solid #fff;
  border-top: none;
  border-left: none;
  transform: rotate(45deg) translate(-1px, -1px);
}

.qz-cb-input:focus-visible + .qz-cb-box {
  outline: 3px solid var(--chapter-color, var(--blue-mid));
  outline-offset: 2px;
}

.qz-cb-letter {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  background: var(--gray-light);
  font-family: var(--font-ui);
  font-size: .75rem;
  font-weight: 700;
  color: var(--gray-dark);
  margin-top: .05rem;
}

.qz-cb-text { flex: 1; }

/* Post-submit states */
.qz-cb-hit {                          /* correct + selected */
  border-color: var(--green-mid);
  background: var(--green-light);
}
.qz-cb-hit .qz-cb-box {
  background: var(--green-mid);
  border-color: var(--green-mid);
}
.qz-cb-hit .qz-cb-letter {
  background: var(--green-mid);
  color: #fff;
}

.qz-cb-missed {                       /* correct but NOT selected */
  border-color: var(--gold-mid);
  background: var(--gold-light);
}
.qz-cb-missed .qz-cb-box {
  border-color: var(--gold-mid);
}
.qz-cb-missed .qz-cb-letter {
  background: var(--gold-mid);
  color: #fff;
}
.qz-cb-missed::after {
  content: ' ← should have selected this';
  font-family: var(--font-ui);
  font-size: .75rem;
  font-style: italic;
  color: var(--gold-dark);
  margin-left: .25rem;
}

.qz-cb-wrong {                        /* incorrect + selected */
  border-color: var(--red-mid);
  background: var(--red-light);
}
.qz-cb-wrong .qz-cb-box {
  background: var(--red-mid);
  border-color: var(--red-mid);
}
.qz-cb-wrong .qz-cb-letter {
  background: var(--red-mid);
  color: #fff;
}

.qz-cb-label:has(.qz-cb-input:disabled) { cursor: default; }
.qz-cb-label:has(.qz-cb-input:disabled):hover {
  border-color: inherit;
  background: inherit;
}
/* Override hover-inherit for the state classes */
.qz-cb-hit:hover    { background: var(--green-light); border-color: var(--green-mid); }
.qz-cb-missed:hover { background: var(--gold-light);  border-color: var(--gold-mid); }
.qz-cb-wrong:hover  { background: var(--red-light);   border-color: var(--red-mid); }


/* ============================================================
  10d. MATCHING (dropdowns)
   ============================================================ */
.qz-match-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-ui);
  font-size: .92rem;
  margin-bottom: var(--gap-md);
}

.qz-match-table thead th {
  background: var(--blue-dark);
  color: #fff;
  font-weight: 600;
  padding: .4rem .75rem;
  text-align: left;
}

.qz-match-table tbody tr {
  border-bottom: 1px solid var(--gray-light);
  transition: background .15s;
}

.qz-match-table tbody tr:last-child { border-bottom: none; }

.qz-match-left {
  padding: .6rem .75rem;
  font-weight: 500;
  color: var(--blue-dark);
  width: 40%;
  vertical-align: middle;
}

.qz-match-right {
  padding: .5rem .75rem;
  vertical-align: middle;
  white-space: nowrap;
}

.qz-match-select {
  flex: 1;
  min-width: 0;
  padding: .4rem .6rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  font-family: var(--font-ui);
  font-size: .88rem;
  color: var(--color-text);
  background: var(--color-surface);
  cursor: pointer;
  transition: border-color .15s;
}

.qz-match-select:focus {
  outline: 3px solid var(--chapter-color, var(--blue-mid));
  outline-offset: 1px;
  border-color: var(--chapter-color, var(--blue-mid));
}

.qz-match-select:disabled { cursor: default; background: var(--gray-xlight); }

/* Row state after submit */
.qz-match-table tr.qz-row-ok   { background: var(--green-xlight); }
.qz-match-table tr.qz-row-miss { background: var(--red-xlight); }

.qz-match-verdict {
  font-family: var(--font-ui);
  font-size: .88rem;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: .3rem;
}

.qz-verdict-ok   { color: var(--green-dark); font-weight: 700; }
.qz-verdict-miss { color: var(--red-dark);   font-weight: 700; }

.qz-correct-ans {
  font-weight: 600;
  font-size: .82rem;
  color: var(--green-dark);
  background: var(--green-light);
  border: 1px solid var(--green-mid);
  border-radius: 3px;
  padding: .05em .35em;
}

.qz-match-hint {
  font-family: var(--font-ui);
  font-size: .85rem;
  color: var(--red-mid);
  margin: .3rem 0 0;
}
.qz-match-hint + button { margin-top: var(--gap-sm); }

/* Submit button for matching/multiple — sits below the input area */
.qz-submit-btn { margin-top: var(--gap-md); }


/* ============================================================
  11. UTILITY & STATES
   ============================================================ */
.qz-error {
  background: var(--red-light);
  border: 1px solid var(--red-mid);
  border-radius: var(--radius);
  color: var(--red-dark);
  padding: var(--gap-md);
  font-family: var(--font-ui);
  font-size: .9rem;
}


/* ============================================================
  12. RESPONSIVE
   ============================================================ */
@media (max-width: 600px) {
  #quiz-app {
    padding: var(--gap-md) var(--gap-sm);
  }

  .qz-card {
    padding: var(--gap-md);
  }

  .qz-score-circle {
    width: 100px;
    height: 100px;
  }

  .qz-sc-num { font-size: 2.1rem; }

  .qz-breakdown thead { display: none; }

  .qz-breakdown,
  .qz-breakdown tbody,
  .qz-breakdown tr,
  .qz-breakdown td {
    display: block;
    width: 100%;
  }

  .qz-breakdown tr {
    padding: .5rem;
    margin-bottom: .4rem;
    border-radius: var(--radius);
  }

  .qz-bd-status { text-align: left; font-weight: 700; }
  .qz-bd-q      { font-weight: 500; }
}


/* ============================================================
  13. PRINT
   ============================================================ */
@media print {
  #quiz-app { max-width: 100%; padding: 0; }
  .qz-btn,
  .qz-start-actions,
  .qz-result-actions,
  .qz-progress { display: none; }
  .qz-option   { border: 1px solid #ccc; }
  .qz-card     { box-shadow: none; border: 1px solid #ccc; }
}