/**
 * Stylesheet for Interactive Parsons Problems (cs1302uga.sphinx.ext.parsons)
 * Fully compatible with Furo theme light and dark modes.
 */

:root {
  --parsons-border-color: var(--color-background-border, #d0d7de);
  --parsons-bg-subtle: var(--color-background-secondary, #f6f8fa);
  --parsons-text-primary: var(--color-foreground-primary, #1f2328);
  --parsons-text-secondary: var(--color-foreground-secondary, #57606a);
  --parsons-block-bg: #ffffff;
  --parsons-block-border: var(--color-brand-primary, #0969da);
  --parsons-block-distractor: #cf222e;
  --parsons-dropzone-bg: #ffffff;
  --parsons-dropzone-active-bg: #f0f7ff;
  --parsons-hover-bg: #ddf4ff;
  --parsons-focus-ring: var(--color-brand-primary, #0969da);
  --parsons-indent-stride: 32px;
  --parsons-guideline-color: rgba(31, 35, 40, 0.08);
  --parsons-tray-title-bg: #eaeef2;
  --parsons-btn-reset-bg: #f6f8fa;
  --parsons-btn-reset-text: #24292f;
  --parsons-btn-reset-border: rgba(31, 35, 40, 0.15);
  --parsons-btn-reset-hover: #eaeef2;
  --parsons-btn-check-bg: #1f883d;
  --parsons-btn-check-fg: #ffffff;
  --parsons-btn-check-hover: #1a7f37;
  --parsons-feedback-bg: #dafbe1;
  --parsons-feedback-border: #4ac26b;
  --parsons-feedback-text: #116329;
  --parsons-help-bg: #ffffff;
  --parsons-tour-card-bg: #ffffff;
  --parsons-tour-card-border: #d0d7de;
  --parsons-tour-badge-bg: #ddf4ff;
  --parsons-tour-badge-text: #0969da;
  --parsons-tour-backdrop-bg: rgba(15, 23, 42, 0.45);
  --parsons-status-success: #1a7f37;
  --parsons-status-error: #cf222e;
}

body[data-theme="dark"],
body:not([data-theme="light"]) {
  --parsons-border-color: var(--color-background-border, #303335);
  --parsons-bg-subtle: var(--color-background-secondary, #1a1c1e);
  --parsons-text-primary: var(--color-foreground-primary, #cfd0d0);
  --parsons-text-secondary: var(--color-foreground-secondary, #9ca0a5);
  --parsons-block-bg: var(--color-code-background, #2b2b2b);
  --parsons-block-border: var(--color-brand-primary, #3d94ff);
  --parsons-block-distractor: #f85149;
  --parsons-dropzone-bg: var(--color-background-primary, #131416);
  --parsons-dropzone-active-bg: #1c2636;
  --parsons-hover-bg: #343942;
  --parsons-focus-ring: var(--color-brand-primary, #3d94ff);
  --parsons-guideline-color: rgba(255, 255, 255, 0.08);
  --parsons-tray-title-bg: #21262d;
  --parsons-btn-reset-bg: #21262d;
  --parsons-btn-reset-text: #c9d1d9;
  --parsons-btn-reset-border: #30363d;
  --parsons-btn-reset-hover: #30363d;
  --parsons-btn-check-bg: #238636;
  --parsons-btn-check-fg: #ffffff;
  --parsons-btn-check-hover: #2ea043;
  --parsons-feedback-bg: rgba(46, 160, 67, 0.15);
  --parsons-feedback-border: rgba(46, 160, 67, 0.4);
  --parsons-feedback-text: #56d364;
  --parsons-help-bg: var(--color-background-primary, #131416);
  --parsons-tour-card-bg: var(--color-background-secondary, #1a1c1e);
  --parsons-tour-card-border: var(--color-background-border, #303335);
  --parsons-tour-badge-bg: rgba(61, 148, 255, 0.15);
  --parsons-tour-badge-text: #58a6ff;
  --parsons-tour-backdrop-bg: rgba(0, 0, 0, 0.65);
  --parsons-status-success: #3fb950;
  --parsons-status-error: #f85149;
}

@media (prefers-color-scheme: dark) {
  body[data-theme="auto"] {
    --parsons-border-color: var(--color-background-border, #303335);
    --parsons-bg-subtle: var(--color-background-secondary, #1a1c1e);
    --parsons-text-primary: var(--color-foreground-primary, #cfd0d0);
    --parsons-text-secondary: var(--color-foreground-secondary, #9ca0a5);
    --parsons-block-bg: var(--color-code-background, #2b2b2b);
    --parsons-block-border: var(--color-brand-primary, #3d94ff);
    --parsons-block-distractor: #f85149;
    --parsons-dropzone-bg: var(--color-background-primary, #131416);
    --parsons-dropzone-active-bg: #1c2636;
    --parsons-hover-bg: #343942;
    --parsons-focus-ring: var(--color-brand-primary, #3d94ff);
    --parsons-guideline-color: rgba(255, 255, 255, 0.08);
    --parsons-tray-title-bg: #21262d;
    --parsons-btn-reset-bg: #21262d;
    --parsons-btn-reset-text: #c9d1d9;
    --parsons-btn-reset-border: #30363d;
    --parsons-btn-reset-hover: #30363d;
  --parsons-btn-check-bg: #238636;
  --parsons-btn-check-fg: #ffffff;
  --parsons-btn-check-hover: #2ea043;
    --parsons-feedback-bg: rgba(46, 160, 67, 0.15);
    --parsons-feedback-border: rgba(46, 160, 67, 0.4);
    --parsons-feedback-text: #56d364;
    --parsons-help-bg: var(--color-background-primary, #131416);
    --parsons-tour-card-bg: var(--color-background-secondary, #1a1c1e);
    --parsons-tour-card-border: var(--color-background-border, #303335);
    --parsons-tour-badge-bg: rgba(61, 148, 255, 0.15);
    --parsons-tour-badge-text: #58a6ff;
    --parsons-tour-backdrop-bg: rgba(0, 0, 0, 0.65);
    --parsons-status-success: #3fb950;
    --parsons-status-error: #f85149;
  }
}

.parsons-exercise {
  border: 1px solid var(--parsons-border-color);
  border-radius: 8px;
  background-color: var(--parsons-bg-subtle);
  color: var(--parsons-text-primary);
  padding: 0.875rem 1.25rem 1.25rem 1.25rem;
  margin: 1.75rem 0;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  position: relative;
}

.parsons-prompt-container {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: stretch;
  gap: 1rem;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--parsons-text-primary);
  margin-bottom: 0.5rem;
  padding-bottom: 0;
}

.parsons-prompt-content {
  flex-grow: 1;
  min-width: 0;
}

.parsons-prompt-content > *:first-child,
.parsons-prompt-content p:first-child {
  margin-top: 0;
}

.parsons-prompt-content > *:last-child,
.parsons-prompt-content p:last-child {
  margin-bottom: 0;
}

/* Header toolbar controls (Tour, Orientation, & Expand toggles) */
.parsons-header-controls {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-shrink: 0;
  margin-top: 0;
}

.parsons-header-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 28px;
  padding: 0;
  font-size: 15px;
  background-color: var(--parsons-block-bg);
  border: 1px solid var(--parsons-border-color);
  border-radius: 5px;
  cursor: pointer;
  color: var(--parsons-text-secondary);
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
  line-height: 1;
}

.parsons-header-btn:hover {
  background-color: var(--parsons-btn-reset-hover);
  color: var(--parsons-block-border);
  border-color: var(--parsons-block-border);
}

.parsons-header-btn:focus-visible {
  outline: 2px solid var(--parsons-focus-ring);
  outline-offset: 1px;
}

.parsons-header-btn.parsons-btn-exit {
  width: auto;
  height: 28px;
  padding: 0 0.55rem;
  font-size: 13px;
  font-weight: 600;
  gap: 0.25rem;
  background-color: var(--parsons-btn-reset-bg);
  border: 1px solid var(--parsons-border-color);
}

.parsons-header-btn.parsons-btn-exit:hover {
  color: #cf222e;
  border-color: #cf222e;
  background-color: var(--parsons-btn-reset-hover);
}

/* Exit button is hidden when collapsed */
.parsons-exercise:not(.parsons-expanded) .parsons-btn-exit {
  display: none !important;
}

/* Inline Collapsed Mode (Launch Bar) */
.parsons-exercise[data-fullscreen-mode="required"]:not(.parsons-expanded) .parsons-header-controls,
.parsons-exercise[data-fullscreen-mode="required"]:not(.parsons-expanded) .parsons-board,
.parsons-exercise[data-fullscreen-mode="required"]:not(.parsons-expanded) .parsons-actions,
.parsons-exercise[data-fullscreen-mode="required"]:not(.parsons-expanded) .parsons-action-toolbar,
.parsons-exercise[data-fullscreen-mode="required"]:not(.parsons-expanded) .parsons-feedback-panel,
.parsons-exercise[data-fullscreen-mode="required"]:not(.parsons-expanded) .parsons-keyboard-help {
  display: none !important;
}

.parsons-exercise.parsons-expanded .parsons-launch-bar {
  display: none !important;
}

.parsons-launch-bar {
  margin-top: 0.85rem;
  display: flex;
  align-items: center;
}

.parsons-btn-launch {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.55rem 1.25rem;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.5;
  border-radius: 6px;
  cursor: pointer;
  user-select: none;
  vertical-align: middle;
  background-color: var(--parsons-btn-check-bg);
  color: var(--parsons-btn-check-fg);
  border: 1px solid var(--parsons-btn-check-bg);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.08);
  transition: background-color 0.15s ease-in-out, border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out, transform 0.1s ease;
}

.parsons-btn-launch:hover {
  background-color: var(--parsons-btn-check-hover);
  border-color: var(--parsons-btn-check-hover);
  box-shadow: 0 3px 6px rgba(0, 0, 0, 0.15), 0 2px 4px rgba(0, 0, 0, 0.1);
  transform: translateY(-1px);
}

.parsons-btn-launch:active {
  transform: translateY(0);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.parsons-btn-launch:focus-visible {
  outline: 2px solid var(--parsons-focus-ring);
  outline-offset: 2px;
}

.parsons-launch-icon {
  display: inline-flex;
  align-items: center;
  line-height: 1;
}

.parsons-launch-badge {
  display: none;
  margin-left: 0.4rem;
  padding: 0.15rem 0.5rem;
  font-size: 0.72rem;
  font-weight: 600;
  border-radius: 10px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.parsons-btn-launch.in-progress {
  background-color: var(--parsons-btn-reset-bg);
  color: var(--parsons-block-border);
  border-color: var(--parsons-block-border);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.parsons-btn-launch.in-progress:hover {
  background-color: var(--parsons-hover-bg);
  border-color: var(--parsons-block-border);
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.12);
}

.parsons-btn-launch.in-progress .parsons-launch-badge {
  display: inline-block;
  background-color: var(--parsons-bg-subtle);
  color: var(--parsons-text-secondary);
  border: 1px solid var(--parsons-border-color);
}

.parsons-btn-launch.solved {
  background-color: #238636;
  border-color: #238636;
  color: #ffffff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
}

.parsons-btn-launch.solved:hover {
  background-color: #2ea043;
  border-color: #2ea043;
  box-shadow: 0 3px 6px rgba(0, 0, 0, 0.15);
}

.parsons-btn-launch.solved .parsons-launch-badge {
  display: inline-block;
  background-color: rgba(255, 255, 255, 0.25);
  color: #ffffff;
}

body.parsons-modal-open {
  overflow: hidden !important;
}

/* Full Viewport Overlay Mode */
.parsons-exercise.parsons-expanded {
  position: fixed !important;
  inset: 0 !important;
  z-index: 99999 !important;
  margin: 0 !important;
  border: none !important;
  border-radius: 0 !important;
  width: 100vw !important;
  max-width: 100vw !important;
  height: 100vh !important;
  box-sizing: border-box !important;
  padding: 1.25rem 2rem !important;
  display: flex !important;
  flex-direction: column !important;
  background-color: var(--parsons-bg-subtle) !important;
  box-shadow: none !important;
  overflow-y: auto !important;
}

.parsons-exercise.parsons-expanded .parsons-prompt-container {
  flex-shrink: 0;
  margin-bottom: 0.85rem;
  padding-bottom: 0.65rem;
}

.parsons-exercise.parsons-expanded .parsons-board {
  flex: 1 1 0;
  min-height: 0;
  margin-bottom: 0.85rem;
}

.parsons-exercise.parsons-expanded .parsons-tray {
  min-height: 0;
  height: 100%;
}

.parsons-exercise.parsons-expanded .parsons-dropzone {
  min-height: 0;
  overflow-y: auto;
}

.parsons-exercise.parsons-expanded .parsons-actions {
  flex-shrink: 0;
  margin-top: 0;
}

.parsons-exercise.parsons-expanded .parsons-feedback-panel {
  flex-shrink: 0;
}

/* Stacked Layout Mode */
.parsons-exercise.parsons-stacked .parsons-board {
  flex-direction: column !important;
}

.parsons-exercise.parsons-stacked .parsons-tray {
  min-height: 200px;
}

.parsons-exercise.parsons-expanded.parsons-stacked .parsons-tray {
  flex: 1 1 0;
  min-height: 0;
}

.parsons-board {
  display: flex;
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}

@media (max-width: 768px) {
  .parsons-board {
    flex-direction: column;
  }
}

.parsons-tray {
  flex: 1;
  background: var(--parsons-dropzone-bg);
  border: 1px solid var(--parsons-border-color);
  border-radius: 6px;
  min-height: 280px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.parsons-tray-title {
  background: var(--parsons-tray-title-bg);
  padding: 0.5rem 0.85rem;
  font-size: 0.825rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--parsons-text-secondary);
  border-bottom: 1px solid var(--parsons-border-color);
}

.parsons-dropzone {
  flex-grow: 1;
  padding: 0.75rem;
  min-height: 240px;
  transition: background-color 0.15s ease;
  box-sizing: border-box;
}

.parsons-dropzone.drop-target-active {
  background-color: var(--parsons-dropzone-active-bg);
  outline: 2px dashed var(--parsons-block-border);
  outline-offset: -2px;
}

/* 2D Indentation vertical guidelines in Target Dropzone */
.parsons-exercise[data-parsons-config*='"layout": "2d"'] .target-dropzone {
  background-image: repeating-linear-gradient(
    to right,
    transparent,
    transparent calc(var(--parsons-indent-stride) - 1px),
    var(--parsons-guideline-color) calc(var(--parsons-indent-stride) - 1px),
    var(--parsons-guideline-color) var(--parsons-indent-stride)
  );
  background-position: 0.75rem 0;
}

/* Parsons Blocks */
.parsons-block {
  background-color: var(--parsons-block-bg);
  color: var(--parsons-text-primary);
  border: 1px solid var(--parsons-border-color);
  border-left: 5px solid var(--parsons-block-border);
  border-radius: 4px;
  padding: 0.45rem 0.75rem;
  margin-bottom: 0.55rem;
  min-height: 52px;
  scroll-margin-bottom: 76px;
  cursor: grab;
  user-select: none;
  touch-action: manipulation;
  transition: background-color 0.15s ease, box-shadow 0.15s ease, margin-left 0.1s ease;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-sizing: border-box;
}

.parsons-block-content {
  flex-grow: 1;
  overflow-x: auto;
}

.parsons-block:hover {
  background-color: var(--parsons-hover-bg);
}

.parsons-block:focus-visible {
  outline: 3px solid var(--parsons-focus-ring);
  outline-offset: 2px;
}

.parsons-block.in-drag {
  opacity: 0.45;
  cursor: grabbing;
}

.parsons-block.is-grabbed,
.parsons-block.is-selected {
  box-shadow: 0 0 0 3px var(--parsons-focus-ring), 0 4px 12px rgba(0, 0, 0, 0.25);
  background-color: var(--parsons-hover-bg);
  cursor: grab;
}

.parsons-block .highlight {
  background: transparent !important;
  margin: 0 !important;
  padding: 0 !important;
}

.parsons-block pre,
.parsons-block-content .highlight pre {
  margin: 0;
  background: transparent !important;
  color: inherit;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.875rem;
  line-height: 1.45;
  white-space: pre-wrap;
  word-break: break-word;
  text-wrap: nowrap;
}

/* Indentation buttons on target blocks in 2D layout */
.parsons-indent-controls {
  display: none;
  align-items: center;
  gap: 2px;
  margin-left: 0.75rem;
  flex-shrink: 0;
}

.parsons-exercise[data-parsons-config*='"layout": "2d"'] .target-dropzone .parsons-indent-controls {
  display: inline-flex;
}

.parsons-indent-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 24px;
  padding: 0;
  font-size: 13px;
  font-family: inherit;
  background-color: var(--parsons-btn-reset-bg);
  border: 1px solid var(--parsons-border-color);
  border-radius: 4px;
  cursor: pointer;
  color: var(--parsons-text-secondary);
  transition: background-color 0.15s ease, color 0.15s ease;
  line-height: 1;
}

.parsons-indent-btn:hover:not(:disabled) {
  background-color: var(--parsons-block-border);
  color: #ffffff;
  border-color: var(--parsons-block-border);
}

.parsons-indent-btn:disabled {
  opacity: 0.25;
  cursor: not-allowed;
}

/* Micro Parsons mode (horizontal token arrangement) */
.parsons-exercise[data-parsons-config*='\"layout\": \"micro\"'] .parsons-dropzone {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-content: flex-start;
}

.parsons-exercise[data-parsons-config*='\"layout\": \"micro\"'] .parsons-block {
  display: inline-flex;
  margin-bottom: 0;
  border-left: 1px solid var(--parsons-border-color);
  border-bottom: 3px solid var(--parsons-block-border);
  padding: 0.35rem 0.6rem;
}

/* Fill-in-the-blank input fields in Faded Parsons */
.parsons-blank-field {
  border: 1px dashed var(--parsons-block-border);
  background-color: var(--parsons-dropzone-bg);
  color: var(--parsons-block-border);
  border-radius: 4px;
  padding: 0.1rem 0.35rem;
  font-family: ui-monospace, monospace;
  font-size: 0.85rem;
  font-weight: 600;
  outline: none;
  vertical-align: baseline;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.parsons-blank-field:focus {
  border-color: var(--parsons-status-success);
  box-shadow: 0 0 0 2px rgba(46, 160, 67, 0.3);
}

.parsons-blank-field.blank-error {
  border-color: var(--parsons-status-error);
  background-color: rgba(248, 81, 73, 0.15);
}

/* Action Controls & Buttons */
.parsons-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.parsons-btn {
  padding: 0.4rem 0.95rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
  border: 1px solid rgba(31, 35, 40, 0.15);
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

.parsons-btn-check {
  background-color: #1f883d;
  color: #ffffff;
  border-color: #1f883d;
}

.parsons-btn-check:hover {
  background-color: #1a7f37;
}

.parsons-btn-reset {
  background-color: var(--parsons-btn-reset-bg);
  color: var(--parsons-btn-reset-text);
  border: 1px solid var(--parsons-btn-reset-border);
}

.parsons-btn-reset:hover {
  background-color: var(--parsons-btn-reset-hover);
}

.parsons-btn-help,
.parsons-btn-tour {
  background-color: transparent;
  color: var(--parsons-text-secondary);
  border-color: transparent;
  text-decoration: underline;
  padding: 0.4rem 0.5rem;
}

.parsons-btn-help:hover,
.parsons-btn-tour:hover {
  color: var(--parsons-block-border);
}

.parsons-status-message {
  font-size: 0.875rem;
  font-weight: 600;
  margin-left: 0.25rem;
  flex-basis: 100%;
  padding-top: 0.25rem;
}

.status-success {
  color: var(--parsons-status-success);
}

.status-error {
  color: var(--parsons-status-error);
}

/* Pedagogical Debrief / Feedback Panel */
.parsons-feedback-panel {
  margin-top: 1rem;
  margin-bottom: 0.75rem;
  padding: 0.65rem 1rem;
  background-color: var(--parsons-feedback-bg);
  border: 1px solid var(--parsons-feedback-border);
  border-radius: 6px;
  color: var(--parsons-feedback-text);
  font-size: 0.925rem;
  line-height: 1.5;
}

.parsons-feedback-heading {
  font-weight: 700;
  margin-top: 0;
  margin-bottom: 0.25rem;
  font-size: 0.95rem;
}

.parsons-feedback-panel p {
  margin-top: 0.25rem;
  margin-bottom: 0.4rem;
}

.parsons-feedback-panel > *:last-child,
.parsons-feedback-panel p:last-child {
  margin-bottom: 0;
}

/* Keyboard Help Panel */
.parsons-keyboard-help {
  margin-top: 0.75rem;
  padding: 0.5rem 0.85rem;
  background: var(--parsons-help-bg);
  border: 1px solid var(--parsons-border-color);
  border-radius: 6px;
  color: var(--parsons-text-secondary);
}

.parsons-keyboard-help p {
  margin: 0;
  line-height: 1.45;
}

/* Interactive Tour Styles */
.parsons-tour-backdrop {
  position: fixed;
  inset: 0;
  background-color: var(--parsons-tour-backdrop-bg);
  z-index: 999998;
  backdrop-filter: blur(1px);
  pointer-events: auto;
}

.parsons-tour-target {
  position: relative !important;
  z-index: 999999 !important;
  box-shadow: 0 0 0 4px var(--parsons-block-border), 0 8px 24px rgba(9, 105, 218, 0.25) !important;
  border-radius: 6px;
  background-color: var(--parsons-bg-subtle) !important;
  transition: box-shadow 0.2s ease;
}

.parsons-tour-card {
  position: fixed;
  z-index: 1000000;
  width: 320px;
  max-width: calc(100vw - 32px);
  background: var(--parsons-tour-card-bg);
  border: 1px solid var(--parsons-tour-card-border);
  border-radius: 8px;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
  padding: 1rem 1.15rem;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  color: var(--parsons-text-primary);
  box-sizing: border-box;
}

.parsons-tour-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.parsons-tour-step-badge {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--parsons-tour-badge-text);
  background-color: var(--parsons-tour-badge-bg);
  padding: 0.2rem 0.5rem;
  border-radius: 12px;
}

.parsons-tour-close {
  background: transparent;
  border: none;
  font-size: 1.1rem;
  line-height: 1;
  color: var(--parsons-text-secondary);
  cursor: pointer;
  padding: 0.2rem 0.35rem;
  border-radius: 4px;
}

.parsons-tour-close:hover {
  background-color: var(--parsons-btn-reset-hover);
  color: var(--parsons-text-primary);
}

.parsons-tour-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
  color: var(--parsons-text-primary);
}

.parsons-tour-body {
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--parsons-text-secondary);
  margin-bottom: 1rem;
}

.parsons-tour-body p {
  margin: 0;
}

.parsons-tour-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
}

.parsons-tour-footer-right {
  display: flex;
  gap: 0.5rem;
}

.parsons-tour-btn {
  padding: 0.35rem 0.75rem;
  font-size: 0.825rem;
  font-weight: 600;
  border-radius: 5px;
  cursor: pointer;
  border: 1px solid var(--parsons-btn-reset-border);
  transition: background-color 0.15s ease;
}

.parsons-tour-btn-primary {
  background-color: var(--parsons-block-border);
  color: #ffffff;
  border-color: var(--parsons-block-border);
}

.parsons-tour-btn-primary:hover {
  opacity: 0.9;
}

.parsons-tour-btn-secondary {
  background-color: var(--parsons-btn-reset-bg);
  color: var(--parsons-btn-reset-text);
}

.parsons-tour-btn-secondary:hover:not(:disabled) {
  background-color: var(--parsons-btn-reset-hover);
}

.parsons-tour-btn-secondary:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* Print Styles */
@media print {
  .parsons-launch-bar,
  .parsons-header-controls,
  .parsons-actions,
  .parsons-keyboard-help {
    display: none !important;
  }

  .parsons-exercise[data-fullscreen-mode="required"] .parsons-board {
    display: flex !important;
  }
}

/* Bootstrap SVG Icons Styling & Sizing */
.parsons-exercise svg.bi,
.parsons-tour-card svg.bi {
  display: inline-block;
  vertical-align: -0.125em;
  fill: currentColor;
  flex-shrink: 0;
}

.parsons-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.parsons-btn svg.bi {
  width: 1em;
  height: 1em;
  margin-right: 0.35rem;
}

.parsons-btn-launch svg.bi {
  width: 1.15em;
  height: 1.15em;
}

.parsons-header-btn svg.bi {
  width: 15px;
  height: 15px;
}

.parsons-indent-btn svg.bi {
  width: 12px;
  height: 12px;
}

.parsons-tour-close svg.bi {
  width: 13px;
  height: 13px;
}

/* Sticky Docked Accessible Action Toolbar */
.parsons-action-toolbar {
  position: sticky;
  bottom: 0;
  z-index: 15;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  align-items: center;
  padding: 0.5rem 0.75rem;
  margin-top: 0.75rem;
  background-color: var(--parsons-bg-subtle);
  border-top: 1px solid var(--parsons-border-color);
  border-radius: 0 0 6px 6px;
  box-shadow: 0 -2px 6px rgba(0, 0, 0, 0.04);
}

.parsons-toolbar-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 48px;
  min-height: 48px;
  padding: 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: 6px;
  border: 1px solid var(--parsons-btn-reset-border);
  background-color: var(--parsons-btn-reset-bg);
  color: var(--parsons-btn-reset-text);
  cursor: pointer;
  touch-action: manipulation;
  user-select: none;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease, opacity 0.15s ease, transform 0.1s ease;
}

.parsons-toolbar-btn:hover:not(:disabled) {
  background-color: var(--parsons-btn-reset-hover);
  color: var(--parsons-btn-reset-text);
  border-color: var(--parsons-btn-reset-border);
}

.parsons-toolbar-btn:active:not(:disabled) {
  background-color: var(--parsons-btn-reset-hover);
  transform: translateY(1px);
}

.parsons-toolbar-btn:focus-visible {
  outline: 3px solid var(--parsons-focus-ring);
  outline-offset: 2px;
}

.parsons-toolbar-btn:disabled,
.parsons-toolbar-btn[aria-disabled="true"] {
  opacity: 0.4;
  cursor: not-allowed;
}

.parsons-toolbar-btn svg.bi {
  width: 20px;
  height: 20px;
  margin-right: 0;
}

/* Hide Indent/Dedent controls in 1D layout */
.parsons-exercise[data-parsons-config*='"layout": "1d"'] .parsons-toolbar-indent,
.parsons-exercise[data-parsons-config*='"layout": "1d"'] .parsons-toolbar-dedent {
  display: none !important;
}

/* Unified Tree / Adaptive Responsive Layout */
.parsons-exercise[data-parsons-config*='"layout": "unified"'] .parsons-board {
  flex-direction: column !important;
}

/* Mobile Responsive Optimization (<= 768px) */
@media (max-width: 768px) {
  .parsons-exercise.parsons-expanded {
    padding: 0.75rem 0.75rem !important;
  }

  .parsons-action-toolbar {
    padding: 0.35rem 0.5rem;
    gap: 0.35rem;
  }
}

/* Component-Scoped High-Contrast Syntax Tokens for WCAG 2.2 AAA (>= 7:1) */
.parsons-exercise .parsons-block code span.k,
.parsons-exercise .parsons-block code span.kd,
.parsons-exercise .parsons-block code span.kn,
.parsons-exercise .parsons-block code span.kp,
.parsons-exercise .parsons-block code span.kr {
  color: #0550ae;
  font-weight: 600;
}

.parsons-exercise .parsons-block code span.s,
.parsons-exercise .parsons-block code span.s1,
.parsons-exercise .parsons-block code span.s2,
.parsons-exercise .parsons-block code span.sa,
.parsons-exercise .parsons-block code span.sb,
.parsons-exercise .parsons-block code span.sc {
  color: #08601e;
}

.parsons-exercise .parsons-block code span.c,
.parsons-exercise .parsons-block code span.c1,
.parsons-exercise .parsons-block code span.ch,
.parsons-exercise .parsons-block code span.cm {
  color: #4c5561;
  font-style: italic;
}

.parsons-exercise .parsons-block code span.nf,
.parsons-exercise .parsons-block code span.fm {
  color: #6639ba;
}

.parsons-exercise .parsons-block code span.m,
.parsons-exercise .parsons-block code span.mi,
.parsons-exercise .parsons-block code span.mf {
  color: #8a4600;
}

body[data-theme="dark"] .parsons-exercise .parsons-block code span.k,
body[data-theme="dark"] .parsons-exercise .parsons-block code span.kd,
body[data-theme="dark"] .parsons-exercise .parsons-block code span.kn,
body[data-theme="dark"] .parsons-exercise .parsons-block code span.kp,
body[data-theme="dark"] .parsons-exercise .parsons-block code span.kr,
body:not([data-theme="light"]) .parsons-exercise .parsons-block code span.k,
body:not([data-theme="light"]) .parsons-exercise .parsons-block code span.kd,
body:not([data-theme="light"]) .parsons-exercise .parsons-block code span.kn,
body:not([data-theme="light"]) .parsons-exercise .parsons-block code span.kp,
body:not([data-theme="light"]) .parsons-exercise .parsons-block code span.kr {
  color: #79c0ff;
}

body[data-theme="dark"] .parsons-exercise .parsons-block code span.s,
body[data-theme="dark"] .parsons-exercise .parsons-block code span.s1,
body[data-theme="dark"] .parsons-exercise .parsons-block code span.s2,
body[data-theme="dark"] .parsons-exercise .parsons-block code span.sa,
body[data-theme="dark"] .parsons-exercise .parsons-block code span.sb,
body[data-theme="dark"] .parsons-exercise .parsons-block code span.sc,
body:not([data-theme="light"]) .parsons-exercise .parsons-block code span.s,
body:not([data-theme="light"]) .parsons-exercise .parsons-block code span.s1,
body:not([data-theme="light"]) .parsons-exercise .parsons-block code span.s2,
body:not([data-theme="light"]) .parsons-exercise .parsons-block code span.sa,
body:not([data-theme="light"]) .parsons-exercise .parsons-block code span.sb,
body:not([data-theme="light"]) .parsons-exercise .parsons-block code span.sc {
  color: #7ee787;
}

body[data-theme="dark"] .parsons-exercise .parsons-block code span.c,
body[data-theme="dark"] .parsons-exercise .parsons-block code span.c1,
body[data-theme="dark"] .parsons-exercise .parsons-block code span.ch,
body[data-theme="dark"] .parsons-exercise .parsons-block code span.cm,
body:not([data-theme="light"]) .parsons-exercise .parsons-block code span.c,
body:not([data-theme="light"]) .parsons-exercise .parsons-block code span.c1,
body:not([data-theme="light"]) .parsons-exercise .parsons-block code span.ch,
body:not([data-theme="light"]) .parsons-exercise .parsons-block code span.cm {
  color: #b1bac4;
}

body[data-theme="dark"] .parsons-exercise .parsons-block code span.nf,
body[data-theme="dark"] .parsons-exercise .parsons-block code span.fm,
body:not([data-theme="light"]) .parsons-exercise .parsons-block code span.nf,
body:not([data-theme="light"]) .parsons-exercise .parsons-block code span.fm {
  color: #d2a8ff;
}

body[data-theme="dark"] .parsons-exercise .parsons-block code span.m,
body[data-theme="dark"] .parsons-exercise .parsons-block code span.mi,
body[data-theme="dark"] .parsons-exercise .parsons-block code span.mf,
body:not([data-theme="light"]) .parsons-exercise .parsons-block code span.m,
body:not([data-theme="light"]) .parsons-exercise .parsons-block code span.mi,
body:not([data-theme="light"]) .parsons-exercise .parsons-block code span.mf {
  color: #ffa675;
}

/* Respect user preference for reduced motion (WCAG 2.2 SC 2.3.3) */
@media (prefers-reduced-motion: reduce) {
  .parsons-exercise,
  .parsons-block,
  .parsons-toolbar-btn,
  .parsons-btn,
  .parsons-dropzone {
    transition: none !important;
    animation: none !important;
  }
}