/* ==========================================================================
   1. Design Token System & Global Variables
   ========================================================================== */
:root {
  /* Common Core Structural Tokens */
  --mcq-radius-lg: 10px;
  --mcq-radius-md: 7px;
  --mcq-radius-sm: 6px;
  --mcq-transition: background 0.12s ease, transform 0.05s ease, border-color 0.12s ease;

  /* Shared Core Core Typography & Interface Colors */
  --mcq-light-bg: #ffffff;
  --mcq-light-border: #e3e6ea;
  --mcq-light-text: #1e293b;
  --mcq-light-letter: #333333;
  --mcq-light-explanation: #555555;
  --mcq-light-hover-bg: #f6f9ff;
  --mcq-light-selected-bg: #eaf2ff;
  --mcq-light-selected-border: #3a8bfd;
  --mcq-light-divider: #e3e6ea;

  /* Dark Theme Structural Alterations (ONLY Canvas BG & Border Override) */
  --mcq-dark-bg: #d8f1ff;        /* Soft light blue tint container background */
  --mcq-dark-border: #334155;    /* Dark border framing layout line */
  --mcq-dark-divider: #334155;   /* Aligned with dark border for panel division rules */

  /* Validation Feedback States */
  --mcq-answer-bg: #f6fff8;
  --mcq-answer-border: #bbf7d0;
  --mcq-answer-marker: #22c55e;

  --mcq-correct-bg: #edfdf3;
  --mcq-correct-border: #bbf7d0;
  --mcq-correct-accent: #22c55e;
  --mcq-correct-text: #16a34a;

  --mcq-incorrect-bg: #fff1f1;
  --mcq-incorrect-border: #fecdd3;
  --mcq-incorrect-accent: #ef4444;
  --mcq-incorrect-text: #dc2626;

  /* Global Score Performance Badges */
  --mcq-tier-high-bg: #edfdf3;
  --mcq-tier-high-border: #22c55e;
  --mcq-tier-high-text: #166534;

  --mcq-tier-mid-bg: #fff7ed;
  --mcq-tier-mid-border: #f59e0b;
  --mcq-tier-mid-text: #9a3412;

  --mcq-tier-low-bg: #fff1f2;
  --mcq-tier-low-border: #ef4444;
  --mcq-tier-low-text: #9f1239;
}

/* ==========================================================================
   2. MCQ Block Core Containers
   ========================================================================== */
.multichoice-block {
  background-color: var(--mcq-light-bg);
  border: 1px solid var(--mcq-light-border);
  border-radius: var(--mcq-radius-lg);
  padding: 1.1em 1.2em;
  margin-bottom: 1.6em;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
  transition: var(--mcq-transition);
}

.multichoice-question {
  font-weight: 600;
  margin-bottom: 0.9em;
  font-size: 1.08em;
  line-height: 1.4;
  color: var(--mcq-light-text);
}

/* ==========================================================================
   3. MCQ Answer Card Choice Items
   ========================================================================== */
.multichoice-choice {
  margin: 0.45em 0;
  border-radius: var(--mcq-radius-md);
  cursor: pointer;
  display: block;
  transition: var(--mcq-transition);
  border: 1px solid transparent;
  border-left: 4px solid transparent;
}

.multichoice-choice label {
  display: flex;
  align-items: flex-start;
  gap: 0.5em;
  padding: 0.6em 0.9em;
  width: 100%;
  cursor: pointer;
  color: var(--mcq-light-text);
}

.multichoice-letter {
  font-weight: 600;
  min-width: 1.4em;
  color: var(--mcq-light-letter);
}

.multichoice-choice-label {
  line-height: 1.4;
  flex: 1;
}

.multichoice-explanation {
  margin-top: 0rem;
  font-size: 0.9em;
  color: var(--mcq-light-explanation);
  padding: 0 0.9em 0.8em 2.8em;
  line-height: 1.45;
  display: none;
}

/* --- Choice Interactive Hover States --- */
.multichoice-choice:not(.multichoice-disabled):hover {
  background-color: var(--mcq-light-hover-bg);
}

.multichoice-choice:active {
  transform: scale(0.995);
}

/* --- Active/Selected Selection Intermediary States --- */
.multichoice-choice.selected {
  background-color: var(--mcq-light-selected-bg);
  border-left-color: var(--mcq-light-selected-border);
}

.multichoice-choice input {
  margin-right: 0.3em;
  margin-top: 0.22em;
  pointer-events: none;
}

/* --- Disabled Cards Layout --- */
.multichoice-choice.multichoice-disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.multichoice-choice.multichoice-disabled:hover {
  background: none;
}

/* ==========================================================================
   4. Live Evaluation Feedback Engine Styling
   ========================================================================== */
.multichoice-choice.multichoice-answer {
  border-color: var(--mcq-answer-border);
  background-color: var(--mcq-answer-bg);
}

.multichoice-choice.multichoice-correct {
  background-color: var(--mcq-correct-bg) !important;
  border-color: var(--mcq-correct-border);
  border-left: 6px solid var(--mcq-correct-accent) !important;
}

.multichoice-choice.multichoice-incorrect {
  background-color: var(--mcq-incorrect-bg) !important;
  border-color: var(--mcq-incorrect-border);
  border-left: 6px solid var(--mcq-incorrect-accent);
}

/* --- Pseudo-elements Validation Icon Mappings --- */
.multichoice-choice label::after {
  font-weight: 600;
  padding-left: 0.5em;
  font-size: 1.1em;
}

.multichoice-choice.multichoice-answer label::after {
  content: "•";
  color: var(--mcq-answer-marker);
}

.multichoice-choice.multichoice-correct label::after {
  content: "✓";
  color: var(--mcq-correct-text);
}

.multichoice-choice.multichoice-incorrect label::after {
  content: "✕";
  color: var(--mcq-incorrect-text);
}

/* ==========================================================================
   5. Action Controls Global Panel & Scoring Output
   ========================================================================== */
.multichoice-global-panel {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-top: 1.2rem;
  padding: 0.8rem 0;
  margin-bottom: 1.2rem;
  border-top: 1px solid var(--mcq-light-divider);
  border-bottom: 1px solid var(--mcq-light-divider);
  transition: border-color 0.12s ease;
}

.multichoice-global-panel button {
  font-size: 0.95em;
  padding: 0.5em 1em;
  border-radius: var(--mcq-radius-sm);
  border: none;
  cursor: pointer;
  font-weight: 500;
  transition: var(--mcq-transition);
}

.multichoice-global-panel button:hover {
  filter: brightness(0.92);
}

.multichoice-global-panel button:active {
  transform: scale(0.97);
}

.multichoice-btn-score {
  background: #2563eb;
  color: #ffffff;
}

.multichoice-btn-reset {
  background: #f3f4f6;
  color: #4b5563;
  border: 1px solid #e5e7eb !important;
}

.multichoice-global-panel button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* --- Score Badge Metric Class Blocks --- */
.multichoice-output {
  margin-left: auto;
  font-weight: 600;
  padding: 0.4em 0.8em;
  border-radius: var(--mcq-radius-sm);
  display: none;
  border: 1px solid transparent;
}

.multichoice-output.high {
  background-color: var(--mcq-tier-high-bg) !important;
  border-color: var(--mcq-tier-high-border) !important;
  color: var(--mcq-tier-high-text) !important;
}

.multichoice-output.medium {
  background-color: var(--mcq-tier-mid-bg) !important;
  border-color: var(--mcq-tier-mid-border) !important;
  color: var(--mcq-tier-mid-text) !important;
}

.multichoice-output.low {
  background-color: var(--mcq-tier-low-bg) !important;
  border-color: var(--mcq-tier-low-border) !important;
  color: var(--mcq-tier-low-text) !important;
}

/* ==========================================================================
   6. Explicit Dark Theme Target Variant Configuration
   ========================================================================== */
.multichoice-block.theme-dark {
  background-color: var(--mcq-dark-bg);
  border-color: var(--mcq-dark-border);
}

.multichoice-block.theme-dark .multichoice-global-panel {
  border-top-color: var(--mcq-dark-divider);
  border-bottom-color: var(--mcq-dark-divider);
}