/* ==========================================================================
   1. Design Token System & Global Variables
   ========================================================================== */
:root {
  /* Common Core Tokens */
  --cloze-radius-lg: 8px;
  --cloze-radius-md: 6px;
  --cloze-radius-sm: 4px;
  --cloze-transition-fast: all 0.1s ease;
  --cloze-transition-normal: all 0.15s ease;

  /* Pure White Theme Canvas Tokens (Default) */
  --cloze-white-bg: #ffffff;
  --cloze-white-border: #e2e8f0;

  /* Light Theme Canvas Tokens (Soft Slate 50 Runway) */
  --cloze-light-bg: #f8fafc;
  --cloze-light-border: #e3e6ea;

  /* Shared Text and UI Tokens */
  --cloze-text: #1e293b;
  --cloze-tray-bg: #f0fdfa; /* Teal Tint */
  --cloze-tray-border: #0d9488; /* Teal 600 */
  --cloze-title: #475569;
  --cloze-divider: #e2e8f0;

  /* Font Sizes */
  --cloze-base-font-size: 1.0em;
  --cloze-code-font-size: 1.1em;

  /* Draggable Item Tokens (Teal Engine) */
  --cloze-drag-bg: #ffffff;
  --cloze-drag-border: #0f766e;
  --cloze-drag-text: #111827;
  --cloze-drag-hover-bg: #ccfbf1;
  --cloze-drag-selected-bg: #99f6e4;
  --cloze-drag-selected-border: #0d9488;

  /* Drop Zone Interactive Tokens (Indigo Engine) */
  --cloze-drop-text: #4f46e5;
  --cloze-drop-bg: #eef2ff;
  --cloze-drop-border: #818cf8;
  --cloze-drop-hover-bg: #e0e7ff;

  /* Validation Feedback System Tokens */
  --cloze-correct-bg: #f0fdf4;
  --cloze-correct-border: #22c55e;
  --cloze-correct-text: #16a34a;

  --cloze-incorrect-bg: #ffe1e1;
  --cloze-incorrect-border: #ef4444;
  --cloze-incorrect-text: #dc2626;

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

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

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

/* ==========================================================================
   2. Core Layout Container & Theme Variants
   ========================================================================== */
.cloze-block {
  border-radius: var(--cloze-radius-lg);
  padding: 0.8rem;
  margin-bottom: 0.8rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  transition: var(--cloze-transition-normal);
}

/* Default Theme: Pure White (#ffffff) */
.cloze-block,
.cloze-block.theme-white {
  background-color: var(--cloze-white-bg);
  border: 1px solid var(--cloze-white-border);
}

/* Optional Light Theme: Soft Slate (#f8fafc) */
.cloze-block.theme-light {
  background-color: var(--cloze-light-bg);
  border: 1px solid var(--cloze-light-border);
}

.cloze-divider {
  border: 0;
  border-top: 1px solid var(--cloze-divider);
  margin: 1.4rem 0;
}

/* ==========================================================================
   3. Word Bank Tray & Draggable Items
   ========================================================================== */
.cloze-instructions {
  font-size: 0.95em;
  font-weight: 500;
  color: var(--cloze-text);
  margin-bottom: 0.8rem;
  line-height: 1.4;
}

.cloze-wordbank-title {
  font-size: 0.85em;
  font-weight: 700;
  color: var(--cloze-title);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.6rem;
  transition: var(--cloze-transition-normal);
}

.cloze-wordbank-tray {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  padding: 0.8rem;
  background-color: var(--cloze-tray-bg);
  border: 2px dashed var(--cloze-tray-border);
  border-radius: var(--cloze-radius-lg);
  min-height: 45px;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.03);
  align-items: center;
  cursor: pointer;
}

.cloze-draggable {
  padding: 0.2rem 0.6rem;
  background-color: var(--cloze-drag-bg);
  border: 1px solid var(--cloze-drag-border);
  color: var(--cloze-drag-text);
  border-radius: var(--cloze-radius-md);
  cursor: pointer;
  font-weight: 600;
  font-size: var(--cloze-base-font-size);
  line-height: 1.2;
  user-select: none;
  box-shadow: 0 2px 4px rgba(13, 148, 136, 0.12);
  transition: transform 0.1s ease, box-shadow 0.1s ease, background-color 0.1s ease, border-color 0.1s ease;
}

.cloze-draggable:hover {
  background-color: var(--cloze-drag-hover-bg);
  transform: translateY(-1px);
}

.cloze-draggable.selected {
  outline: 2px solid var(--cloze-drag-selected-border) !important;
  outline-offset: 1px !important;
  background-color: var(--cloze-drag-selected-bg) !important;
  border-color: var(--cloze-drag-selected-border) !important;
  transform: translateY(-2px) scale(1.03) !important;
  box-shadow: 0 4px 8px rgba(13, 148, 136, 0.25) !important;
}

.cloze-draggable:active {
  cursor: grabbing;
}

.cloze-draggable.dragging {
  opacity: 0.3;
}

/* ==========================================================================
   4. Main Content Passage & Preformatted Prose
   ========================================================================== */
.cloze-content {
  font-size: var(--cloze-base-font-size);
  line-height: 2.6;
  color: var(--cloze-text);
  transition: var(--cloze-transition-normal);
}

pre.cloze-content {
  font-family: "Consolas", "Courier New", Courier, monospace;
  font-size: var(--cloze-code-font-size);
  line-height: 1.6;
  margin: 0;
  padding: 0.5rem;
  background: transparent;
  white-space: pre-wrap;
  word-wrap: break-word;
  overflow-x: hidden;
}

/* ==========================================================================
   5. Sentence Drop Zones
   ========================================================================== */
.cloze-wrapper {
  display: inline-flex;
  align-items: center;
  vertical-align: middle;
}

.cloze-dropzone {
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  min-width: 100px;
  text-align: center;
  padding: 0.15rem 0.5rem !important;
  margin: 0;
  font-size: var(--cloze-base-font-size) !important;
  font-weight: 600;
  line-height: 1.2 !important;
  color: var(--cloze-drop-text);
  background-color: var(--cloze-drop-bg);
  border: 2px dashed var(--cloze-drop-border);
  border-radius: var(--cloze-radius-md);
  cursor: pointer;
  transition: var(--cloze-transition-normal);
  box-shadow: inset 0 1px 2px rgba(79, 70, 229, 0.05);
  box-sizing: border-box !important;
}

.cloze-block.theme-white .cloze-dropzone.occupied {
  background-color: var(--cloze-white-bg);
  border-style: solid;
}

.cloze-block.theme-light .cloze-dropzone.occupied {
  background-color: var(--cloze-light-bg);
  border-style: solid;
}

.cloze-dropped-token {
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  padding: 0;
  margin: 0;
  font-size: inherit !important;
  font-weight: 700;
  line-height: 1.2 !important;
  border-radius: var(--cloze-radius-sm);
}

pre.cloze-content .cloze-dropzone {
  font-size: var(--cloze-code-font-size) !important;
  padding: 0.1rem 0.4rem !important;
  min-width: 65px;
}

/* ==========================================================================
   6. Validation Feedback States
   ========================================================================== */
.cloze-dropzone.correct {
  border-color: var(--cloze-correct-border) !important;
  background-color: var(--cloze-correct-bg) !important;
}

.cloze-dropzone.correct .cloze-dropped-token {
  color: var(--cloze-correct-text) !important;
}

.cloze-dropzone.incorrect {
  border-color: var(--cloze-incorrect-border) !important;
  background-color: var(--cloze-incorrect-bg) !important;
}

.cloze-dropzone.incorrect .cloze-dropped-token {
  color: var(--cloze-incorrect-text) !important;
}

.cloze-inline-feedback {
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  font-weight: 700;
  font-size: var(--cloze-base-font-size) !important;
  line-height: 1.0 !important;
  margin-left: 0.35rem !important;
  height: 1em !important;
  vertical-align: middle !important;
  white-space: nowrap !important;
}

.cloze-inline-feedback.text-correct {
  color: var(--cloze-correct-text) !important;
}

.cloze-inline-feedback.text-incorrect {
  color: var(--cloze-incorrect-text) !important;
}

pre.cloze-content .cloze-inline-feedback {
  font-size: var(--cloze-code-font-size) !important;
  margin-left: 0.2rem !important;
}

/* ==========================================================================
   7. Global Control Panel & Evaluation Output
   ========================================================================== */
.cloze-global-panel {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-top: 1.2rem;
  padding: 1rem 0;
  border-top: 1px solid var(--cloze-divider);
  border-bottom: 1px solid var(--cloze-divider);
}

.cloze-global-panel button {
  font-size: var(--cloze-base-font-size);
  padding: 0.4rem 0.8rem;
  border-radius: var(--cloze-radius-md);
  border: none;
  cursor: pointer;
  font-weight: 500;
  transition: background-color 0.1s ease, transform 0.05s ease, opacity 0.15s ease;
}

.cloze-global-panel button:hover:not(:disabled) {
  filter: brightness(0.93);
}

.cloze-global-panel button:active:not(:disabled) {
  transform: scale(0.97);
}

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

.cloze-btn-score:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  filter: grayscale(40%);
}

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

.cloze-output {
  margin-left: auto;
  font-weight: 600;
  padding: 0.4em 0.9em;
  border-radius: var(--cloze-radius-md);
  display: none;
  border: 1px solid transparent;
}

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

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

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

/* ==========================================================================
   8. Completed Code Section
   ========================================================================== */
.cloze-completed-code {
  display: none;
  margin-top: 1rem;
  margin-bottom: 2rem;
  transition: opacity 0.2s ease-in-out;
}