/**
 * Enhanced Exact Question Styles - F-030 Phase 4
 *
 * Complete styling for exact/numeric answer questions:
 * - Container glass card design
 * - Question stem with metadata
 * - Input field with unit display
 * - Correct/incorrect states
 * - Result feedback badge
 * - Explanation display
 * - Dark mode, responsive, accessibility
 *
 * Created: 2026-01-22
 */

/* ==================== EXACT CONTAINER ==================== */
/* Note: Container frame comes from parent .question-display */

.quiz-exact {
  /* Uses unified .quiz-container system */
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center; /* Center the simple input vertically */
}

@keyframes exactContentFadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* ==================== QUESTION STEM ==================== */

.quiz-exact .quiz-question-stem {
  margin-bottom: var(--space-lg, 1.5rem);
  animation: exactStemFadeIn 350ms ease-out;
}

@keyframes exactStemFadeIn {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.quiz-exact .quiz-question-text {
  font-size: var(--font-lg, 1.125rem);
  font-weight: 500;
  color: var(--text-primary, #1f2937);
  line-height: 1.6;
  margin: 0 0 var(--space-sm, 0.5rem) 0;
}

.quiz-exact .quiz-question-marks {
  display: inline-block;
  font-size: var(--font-sm, 0.875rem);
  color: var(--text-muted, #64748b);
  font-weight: 500;
}

/* ==================== INPUT CONTAINER ==================== */

.quiz-exact-input-container {
  display: flex;
  align-items: center;
  gap: var(--space-md, 1rem);
  margin-bottom: var(--space-lg, 1.5rem);
  animation: exactInputSlideIn 300ms ease-out 150ms both;
}

@keyframes exactInputSlideIn {
  from {
    opacity: 0;
    transform: translateX(-16px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Input wrapper for input + unit */
.quiz-exact-input-wrapper {
  display: flex;
  align-items: center;
  gap: var(--space-sm, 0.5rem);
}

/* ==================== INPUT FIELD ==================== */

.quiz-exact-input {
  width: 180px;
  height: 52px;
  padding: var(--space-sm, 0.5rem) var(--space-md, 1rem);
  background: var(--bg-secondary, #f3f4f6);
  color: var(--text-primary, #1f2937);
  border: 2px solid var(--border, #e5e7eb);
  border-radius: var(--radius-md, 8px);
  font-size: var(--font-lg, 1.125rem);
  font-weight: 600;
  text-align: center;
  transition: all var(--transition-fast, 150ms);
}

.quiz-exact-input::placeholder {
  color: var(--text-muted, #9ca3af);
  font-weight: 400;
}

.quiz-exact-input:hover {
  border-color: var(--border-light, #d1d5db);
}

.quiz-exact-input:focus {
  outline: none;
  border-color: var(--accent, #2563EB);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
  background: var(--bg-primary, #ffffff);
}

/* Remove number input spinners */
.quiz-exact-input[type="number"]::-webkit-inner-spin-button,
.quiz-exact-input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.quiz-exact-input[type="number"] {
  -moz-appearance: textfield;
}

/* ==================== UNIT LABEL ==================== */

.quiz-exact-unit {
  font-size: var(--font-base, 1rem);
  font-weight: 600;
  color: var(--text-secondary, #6b7280);
}

/* ==================== POST-SUBMISSION STATES ==================== */

/* Disable input after submission */
.quiz-exact.quiz-submitted .quiz-exact-input {
  cursor: not-allowed;
  pointer-events: none;
}

/* Correct answer */
.quiz-exact.answer-correct .quiz-exact-input {
  border-color: var(--success, #22c55e);
  background: rgba(34, 197, 94, 0.1);
  color: var(--success, #22c55e);
}

/* Incorrect answer */
.quiz-exact.answer-incorrect .quiz-exact-input {
  border-color: var(--error, #ef4444);
  background: rgba(239, 68, 68, 0.1);
  color: var(--error, #ef4444);
}

/* ==================== SUBMIT BUTTON ==================== */

.quiz-exact .quiz-submit-container {
  margin-bottom: var(--space-lg, 1.5rem);
}

.quiz-exact .quiz-btn-submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm, 0.5rem);
  padding: var(--space-sm, 0.75rem) var(--space-xl, 2rem);
  background: var(--accent, #2563EB);
  color: white;
  border: none;
  border-radius: var(--radius-md, 0.5rem);
  font-size: var(--font-base, 1rem);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast, 150ms);
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
}

.quiz-exact .quiz-btn-submit:hover {
  background: var(--accent-hover, #2563eb);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

.quiz-exact .quiz-btn-submit:active {
  transform: translateY(0);
}

.quiz-exact .quiz-btn-submit:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* ==================== RESULT FEEDBACK BADGE ==================== */

.quiz-exact .quiz-feedback {
  margin-bottom: var(--space-md, 1rem);
}

.quiz-exact .quiz-feedback:empty {
  display: none;
}

.quiz-exact-result {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm, 0.5rem);
  padding: var(--space-sm, 0.5rem) var(--space-md, 1rem);
  border-radius: var(--radius-md, 0.5rem);
  font-weight: 600;
  font-size: var(--font-base, 1rem);
  animation: exactResultFadeIn 300ms ease-out;
}

.quiz-exact-result--correct {
  background: rgba(34, 197, 94, 0.15);
  color: var(--success, #22c55e);
  border: 1px solid var(--success, #22c55e);
}

.quiz-exact-result--incorrect {
  background: rgba(239, 68, 68, 0.15);
  color: var(--error, #ef4444);
  border: 1px solid var(--error, #ef4444);
}

.quiz-exact-result-icon {
  font-size: 1.2em;
}

@keyframes exactResultFadeIn {
  from {
    opacity: 0;
    transform: translateY(-8px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* ==================== EXPLANATION BOX ==================== */

.quiz-exact-explanation {
  margin-top: var(--space-md, 1rem);
  padding: var(--space-md, 1rem);
  background: rgba(59, 130, 246, 0.08);
  border-left: 3px solid var(--accent, #2563EB);
  border-radius: var(--radius-md, 0.5rem);
  font-size: var(--font-sm, 0.875rem);
  line-height: 1.6;
  color: var(--text-secondary, #6b7280);
  animation: exactExplanationFadeIn 300ms ease-in;
}

/* Explanation styling based on answer correctness */
.quiz-exact.answer-correct .quiz-exact-explanation,
.quiz-exact.answer-correct .quiz-feedback {
  background: rgba(34, 197, 94, 0.08);
  border-left-color: var(--success, #22c55e);
}

.quiz-exact.answer-incorrect .quiz-exact-explanation,
.quiz-exact.answer-incorrect .quiz-feedback {
  background: rgba(239, 68, 68, 0.08);
  border-left-color: var(--error, #ef4444);
}

.quiz-exact-explanation-title {
  display: flex;
  align-items: center;
  gap: var(--space-sm, 0.5rem);
  font-weight: 600;
  color: var(--accent, #2563EB);
  margin-bottom: var(--space-sm, 0.5rem);
}

.quiz-exact.answer-correct .quiz-exact-explanation-title {
  color: var(--success, #22c55e);
}

.quiz-exact.answer-incorrect .quiz-exact-explanation-title {
  color: var(--error, #ef4444);
}

.quiz-exact-explanation-text {
  color: var(--text-primary, #1f2937);
}

@keyframes exactExplanationFadeIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ==================== DARK MODE ==================== */

@media (prefers-color-scheme: dark) {
  .quiz-exact .quiz-question-text {
    color: var(--text-primary-dark, #f9fafb);
  }

  .quiz-exact .quiz-question-marks {
    color: var(--text-muted-dark, #6b7280);
  }

  .quiz-exact-input {
    background: var(--bg-secondary-dark, #1f2937);
    border-color: var(--border-dark, #374151);
    color: var(--text-primary-dark, #f9fafb);
  }

  .quiz-exact-input:hover {
    border-color: var(--border-light-dark, #4b5563);
  }

  .quiz-exact-input:focus {
    background: var(--bg-primary-dark, #111827);
  }

  .quiz-exact-unit {
    color: var(--text-secondary-dark, #9ca3af);
  }

  .quiz-exact.answer-correct .quiz-exact-input {
    background: rgba(34, 197, 94, 0.2);
  }

  .quiz-exact.answer-incorrect .quiz-exact-input {
    background: rgba(239, 68, 68, 0.2);
  }

  /* Result badge dark mode */
  .quiz-exact-result--correct {
    background: rgba(34, 197, 94, 0.2);
  }

  .quiz-exact-result--incorrect {
    background: rgba(239, 68, 68, 0.2);
  }

  /* Explanation dark mode */
  .quiz-exact-explanation {
    background: rgba(59, 130, 246, 0.15);
    color: var(--text-secondary-dark, #9ca3af);
  }

  .quiz-exact.answer-correct .quiz-exact-explanation {
    background: rgba(34, 197, 94, 0.15);
  }

  .quiz-exact.answer-incorrect .quiz-exact-explanation {
    background: rgba(239, 68, 68, 0.15);
  }

  .quiz-exact-explanation-title {
    color: var(--accent-light, #60a5fa);
  }

  .quiz-exact.answer-correct .quiz-exact-explanation-title {
    color: var(--success-light, #4ade80);
  }

  .quiz-exact.answer-incorrect .quiz-exact-explanation-title {
    color: var(--error-light, #f87171);
  }

  .quiz-exact-explanation-text {
    color: var(--text-primary-dark, #f9fafb);
  }
}

/* ==================== MOBILE RESPONSIVE ==================== */

@media (max-width: 640px) {
  .quiz-exact .quiz-question-text {
    font-size: var(--font-base, 1rem);
  }

  .quiz-exact-input-container {
    flex-direction: column;
    align-items: stretch;
  }

  .quiz-exact-input-wrapper {
    width: 100%;
    justify-content: center;
  }

  .quiz-exact-input {
    width: 100%;
    max-width: 200px;
    height: 48px;
    font-size: var(--font-base, 1rem);
  }

  .quiz-exact .quiz-btn-submit {
    width: 100%;
    padding: var(--space-md, 0.75rem);
  }

  .quiz-exact-result {
    font-size: var(--font-sm, 0.875rem);
    padding: var(--space-xs, 0.375rem) var(--space-sm, 0.5rem);
  }

  .quiz-exact-explanation {
    font-size: 0.8125rem;
    padding: var(--space-sm, 0.5rem);
  }
}

/* ==================== ACCESSIBILITY ==================== */

/* High contrast mode support */
@media (prefers-contrast: high) {
  .quiz-exact-input {
    border-width: 3px;
  }

  .quiz-exact.answer-correct .quiz-exact-input,
  .quiz-exact.answer-incorrect .quiz-exact-input {
    border-width: 4px;
  }

  .quiz-exact-result {
    border-width: 2px;
  }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  .quiz-exact,
  .quiz-exact-input-container,
  .quiz-exact-input,
  .quiz-exact-explanation,
  .quiz-exact-result,
  .quiz-exact .quiz-question-stem {
    transition: none;
    animation: none;
  }

  .quiz-exact .quiz-btn-submit:hover {
    transform: none;
  }
}

/* Screen reader only text */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}