/**
 * Activity Styles
 * Styling for interactive course activities
 */

/* ============================================
   CSS Variables (Theme Support)
   ============================================ */

.activity[data-theme="teal"] {
  --activity-primary: #14b8a6;
  --activity-primary-light: #2dd4bf;
  --activity-primary-dark: #0d9488;
  --activity-primary-bg: rgba(20, 184, 166, 0.1);
}

.activity[data-theme="indigo"] {
  --activity-primary: #6366f1;
  --activity-primary-light: #818cf8;
  --activity-primary-dark: #4f46e5;
  --activity-primary-bg: rgba(99, 102, 241, 0.1);
}

/* ============================================
   Base Activity Container
   ============================================ */

.activity {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  max-width: 800px;
  margin: 0 auto;
  padding: 24px;
  color: #1e293b;
  line-height: 1.6;
}

.activity-loading,
.activity-error {
  text-align: center;
  padding: 60px 24px;
  color: #64748b;
}

.activity-error h2 {
  color: #ef4444;
  margin-bottom: 16px;
}

.activity-error button {
  margin-top: 16px;
  padding: 12px 24px;
  background: #3b82f6;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
}

/* ============================================
   Mobile Gate
   ============================================ */

.activity-mobile-gate {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
}

.activity-mobile-gate__content {
  background: white;
  border-radius: 16px;
  padding: 40px 32px;
  max-width: 400px;
  text-align: center;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.1);
}

.activity-mobile-gate__icon {
  font-size: 48px;
  margin-bottom: 16px;
}

.activity-mobile-gate__title {
  font-size: 24px;
  font-weight: 700;
  color: #1e293b;
  margin: 0 0 16px 0;
}

.activity-mobile-gate__text {
  color: #64748b;
  margin: 0;
  font-size: 15px;
}

.activity-mobile-gate__buttons {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 32px;
}

.activity-mobile-gate__btn {
  padding: 16px 24px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
}

.activity-mobile-gate__btn--primary {
  background: #14b8a6;
  color: white;
}

.activity-mobile-gate__btn--primary:hover {
  background: #0d9488;
}

.activity-mobile-gate__btn--secondary {
  background: #f1f5f9;
  color: #475569;
  border: 1px solid #e2e8f0;
}

.activity-mobile-gate__btn--secondary:hover {
  background: #e2e8f0;
}

.activity-mobile-gate__btn-hint {
  display: block;
  font-size: 12px;
  font-weight: 400;
  opacity: 0.8;
  margin-top: 4px;
}

/* ============================================
   Activity Header
   ============================================ */

.activity__header {
  margin-bottom: 32px;
}

.activity__badge {
  display: inline-block;
  background: var(--activity-primary);
  color: white;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}

.activity__title {
  font-size: 28px;
  font-weight: 700;
  color: #0f172a;
  margin: 0 0 8px 0;
}

.activity__description {
  color: #64748b;
  font-size: 16px;
  margin: 0;
}

/* ============================================
   Progress Bar
   ============================================ */

.activity__progress {
  margin-bottom: 32px;
}

.activity__progress-bar {
  height: 8px;
  background: #e2e8f0;
  border-radius: 4px;
  overflow: hidden;
}

.activity__progress-fill {
  height: 100%;
  background: var(--activity-primary);
  border-radius: 4px;
  transition: width 0.3s ease;
  width: 0%;
}

.activity__progress-text {
  font-size: 13px;
  color: #64748b;
  margin-top: 8px;
}

/* ============================================
   Question Container
   ============================================ */

.activity__questions {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.activity-question {
  background: white;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.activity-question__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.activity-question__info-block {
  background: #f0f9ff;
  border: 1px solid #bae6fd;
  border-left: 4px solid var(--activity-primary, #6366f1);
  border-radius: 8px;
  padding: 16px 20px;
  margin-bottom: 16px;
  font-size: 15px;
  line-height: 1.6;
  color: #1e293b;
}

.activity-question__info-block h4 {
  margin: 0 0 8px 0;
  font-size: 16px;
  font-weight: 700;
  color: #0f172a;
}

.activity-question__info-block ul,
.activity-question__info-block ol {
  margin: 8px 0;
  padding-left: 20px;
}

.activity-question__info-block li {
  margin-bottom: 4px;
}

.activity-question__info-block strong {
  color: #0f172a;
}

.activity-question__number {
  font-size: 12px;
  font-weight: 700;
  color: var(--activity-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.activity-question__status {
  font-size: 12px;
  font-weight: 600;
  padding: 4px 8px;
  border-radius: 4px;
}

.activity-question__status--correct {
  background: #dcfce7;
  color: #16a34a;
}

.activity-question__status--incorrect {
  background: #fef2f2;
  color: #dc2626;
}

.activity-question__status--skipped {
  background: #fef3c7;
  color: #d97706;
}

.activity-question__status--answered {
  background: #dbeafe;
  color: #2563eb;
}

.activity-question__prompt {
  font-size: 16px;
  font-weight: 500;
  color: #1e293b;
  margin: 0 0 20px 0;
}

.activity-question__hint {
  background: #fef3c7;
  border-left: 4px solid #f59e0b;
  padding: 12px 16px;
  border-radius: 0 8px 8px 0;
  margin-top: 16px;
  font-size: 14px;
  color: #92400e;
}

.activity-question__explanation {
  background: #dcfce7;
  border-left: 4px solid #22c55e;
  padding: 12px 16px;
  border-radius: 0 8px 8px 0;
  margin-top: 16px;
  font-size: 14px;
  color: #166534;
}

.activity-question__skip {
  display: block;
  margin-top: 16px;
  padding: 8px 16px;
  background: transparent;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  color: #64748b;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
}

.activity-question__skip:hover {
  background: #f8fafc;
  border-color: #cbd5e1;
}

/* ============================================
   Multiple Choice
   ============================================ */

.activity-mc__options {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.activity-mc__option {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: #f8fafc;
  border: 2px solid #e2e8f0;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
  text-align: left;
  width: 100%;
}

.activity-mc__option:hover:not(:disabled) {
  border-color: var(--activity-primary);
  background: var(--activity-primary-bg);
}

.activity-mc__option--selected {
  border-color: var(--activity-primary);
  background: var(--activity-primary-bg);
}

.activity-mc__option--correct {
  border-color: #22c55e !important;
  background: #dcfce7 !important;
}

.activity-mc__option--incorrect {
  border-color: #ef4444 !important;
  background: #fef2f2 !important;
}

.activity-mc__option-letter {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: white;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  color: #64748b;
  flex-shrink: 0;
}

.activity-mc__option--selected .activity-mc__option-letter {
  background: var(--activity-primary);
  border-color: var(--activity-primary);
  color: white;
}

.activity-mc__option--correct .activity-mc__option-letter {
  background: #22c55e;
  border-color: #22c55e;
  color: white;
}

.activity-mc__option--incorrect .activity-mc__option-letter {
  background: #ef4444;
  border-color: #ef4444;
  color: white;
}

.activity-mc__option-text {
  font-size: 15px;
  color: #334155;
}

/* ============================================
   Open Ended
   ============================================ */

.activity-open__textarea {
  width: 100%;
  min-height: 120px;
  padding: 14px 16px;
  border: 2px solid #e2e8f0;
  border-radius: 8px;
  font-family: inherit;
  font-size: 15px;
  line-height: 1.6;
  resize: vertical;
  transition: border-color 0.2s;
}

.activity-open__textarea:focus {
  outline: none;
  border-color: var(--activity-primary);
}

.activity-open__textarea::placeholder {
  color: #94a3b8;
}

.activity-open__charcount {
  font-size: 13px;
  color: #64748b;
  margin-top: 8px;
}

.activity-open__charcount--insufficient {
  color: #dc2626;
}

.activity-open__save {
  display: block;
  margin-top: 12px;
  padding: 10px 20px;
  background: var(--activity-primary);
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

.activity-open__save:hover {
  background: var(--activity-primary-dark);
}

/* ============================================
   Fill in the Blank
   ============================================ */

.activity-fill__prompt {
  font-size: 16px;
  line-height: 2;
  color: #334155;
}

.activity-fill__input {
  display: inline-block;
  width: 120px;
  padding: 6px 12px;
  border: 2px solid #e2e8f0;
  border-radius: 6px;
  font-family: inherit;
  font-size: 15px;
  text-align: center;
  transition: all 0.2s;
}

.activity-fill__input:focus {
  outline: none;
  border-color: var(--activity-primary);
}

.activity-fill__input--correct {
  border-color: #22c55e !important;
  background: #dcfce7;
}

.activity-fill__input--incorrect {
  border-color: #ef4444 !important;
  background: #fef2f2;
}

.activity-fill__select {
  display: inline-block;
  padding: 6px 12px;
  border: 2px solid #e2e8f0;
  border-radius: 6px;
  font-family: inherit;
  font-size: 15px;
  background: white;
  cursor: pointer;
  transition: all 0.2s;
}

.activity-fill__select:focus {
  outline: none;
  border-color: var(--activity-primary);
}

.activity-fill__select--correct {
  border-color: #22c55e !important;
  background: #dcfce7;
}

.activity-fill__select--incorrect {
  border-color: #ef4444 !important;
  background: #fef2f2;
}

.activity-fill__check {
  display: block;
  margin-top: 16px;
  padding: 10px 20px;
  background: var(--activity-primary);
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

.activity-fill__check:hover {
  background: var(--activity-primary-dark);
}

/* ============================================
   Match Following
   ============================================ */

.activity-match__container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 16px;
}

@media (max-width: 600px) {
  .activity-match__container {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .activity-match__column--right {
    border-top: 1px solid #e2e8f0;
    padding-top: 16px;
  }
}

.activity-match__column {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.activity-match__item {
  padding: 12px 16px;
  background: #f8fafc;
  border: 2px solid #e2e8f0;
  border-radius: 8px;
  font-size: 14px;
  color: #334155;
  cursor: pointer;
  transition: all 0.2s;
  text-align: left;
}

.activity-match__item:hover:not(:disabled) {
  border-color: var(--activity-primary);
}

.activity-match__item--selected {
  border-color: var(--activity-primary) !important;
  background: var(--activity-primary-bg) !important;
  box-shadow: 0 0 0 3px rgba(20, 184, 166, 0.2);
}

.activity-match__item--matched {
  border-color: #94a3b8;
  background: #f1f5f9;
  opacity: 0.8;
}

.activity-match__item--correct {
  border-color: #22c55e !important;
  background: #dcfce7 !important;
  opacity: 1;
}

.activity-match__item--incorrect {
  border-color: #ef4444 !important;
  background: #fef2f2 !important;
  opacity: 1;
}

.activity-match__check,
.activity-match__clear {
  display: inline-block;
  margin-top: 16px;
  margin-right: 8px;
  padding: 10px 20px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.activity-match__check {
  background: var(--activity-primary);
  color: white;
  border: none;
}

.activity-match__check:hover {
  background: var(--activity-primary-dark);
}

.activity-match__clear {
  background: white;
  color: #64748b;
  border: 1px solid #e2e8f0;
}

.activity-match__clear:hover {
  background: #f8fafc;
  border-color: #cbd5e1;
}

/* ============================================
   Footer / Submit Section
   ============================================ */

.activity__footer {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 2px solid #e2e8f0;
}

.activity__submit-section {
  max-width: 500px;
}

.activity__submit-title {
  font-size: 20px;
  font-weight: 700;
  color: #0f172a;
  margin: 0 0 8px 0;
}

.activity__submit-text {
  color: #64748b;
  font-size: 15px;
  margin: 0 0 24px 0;
}

.activity__name-input-wrapper {
  margin-bottom: 16px;
}

.activity__name-label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: #334155;
  margin-bottom: 8px;
}

.activity__name-input {
  width: 100%;
  padding: 14px 16px;
  border: 2px solid #e2e8f0;
  border-radius: 8px;
  font-size: 16px;
  transition: border-color 0.2s;
}

.activity__name-input:focus {
  outline: none;
  border-color: var(--activity-primary);
}

.activity__name-input:disabled {
  background: #f1f5f9;
  color: #64748b;
}

.activity__warning {
  background: #fef3c7;
  border: 1px solid #fcd34d;
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 20px;
  font-size: 14px;
  color: #92400e;
}

.activity__download-btn {
  display: block;
  width: 100%;
  padding: 16px 24px;
  background: var(--activity-primary);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.activity__download-btn:hover:not(:disabled) {
  background: var(--activity-primary-dark);
}

.activity__download-btn:disabled {
  background: #cbd5e1;
  cursor: not-allowed;
}

.activity__canvas-link {
  display: inline-block;
  margin-top: 16px;
  padding: 12px 24px;
  background: #3b82f6;
  color: white;
  text-decoration: none;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  transition: background 0.2s;
}

.activity__canvas-link:hover {
  background: #2563eb;
}

/* ============================================
   Version Footer
   ============================================ */

.activity__version {
  margin-top: 48px;
  padding-top: 16px;
  border-top: 1px solid #e2e8f0;
  font-size: 12px;
  color: #94a3b8;
  text-align: center;
}

/* ============================================
   AI Discussion Question Type
   Three-phase: Enter → AI Questions → Summarize
   ============================================ */

.activity-ai-discussion__instructions {
  background: #eff6ff;
  border-left: 4px solid #3b82f6;
  padding: 12px 16px;
  margin-bottom: 16px;
  border-radius: 0 8px 8px 0;
  font-size: 14px;
  color: #1e40af;
  line-height: 1.5;
}

.activity-ai-discussion__generate-btn {
  display: inline-block;
  background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  color: white;
  border: none;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  margin-top: 12px;
  transition: opacity 0.2s ease, transform 0.1s ease;
}

.activity-ai-discussion__generate-btn:hover:not(:disabled) {
  opacity: 0.9;
  transform: translateY(-1px);
}

.activity-ai-discussion__generate-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Loading state */
.activity-ai-discussion__loading {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 20px;
  margin: 16px 0;
  background: #faf5ff;
  border: 1px solid #e9d5ff;
  border-radius: 8px;
  color: #7c3aed;
}

.activity-ai-discussion__spinner {
  width: 24px;
  height: 24px;
  border: 3px solid #e9d5ff;
  border-top-color: #7c3aed;
  border-radius: 50%;
  animation: ai-spin 0.8s linear infinite;
}

@keyframes ai-spin {
  to { transform: rotate(360deg); }
}

.activity-ai-discussion__loading p {
  margin: 0;
  font-size: 14px;
  font-weight: 500;
}

/* Error state */
.activity-ai-discussion__error {
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: 8px;
  padding: 16px;
  margin: 16px 0;
  color: #991b1b;
  font-size: 14px;
}

.activity-ai-discussion__error p {
  margin: 0 0 12px 0;
}

.activity-ai-discussion__retry-btn {
  background: #991b1b;
  color: white;
  border: none;
  padding: 6px 16px;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
}

/* AI-generated questions display */
.activity-ai-discussion__observation {
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  border-radius: 8px;
  padding: 14px 16px;
  margin-bottom: 16px;
  font-size: 14px;
  color: #166534;
  line-height: 1.5;
}

.activity-ai-discussion__observation:empty {
  display: none;
}

.activity-ai-discussion__questions-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}

.activity-ai-discussion__question-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 14px 16px;
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  font-size: 15px;
  line-height: 1.5;
  color: #1f2937;
  transition: border-color 0.2s ease;
}

.activity-ai-discussion__question-item:hover {
  border-color: #a78bfa;
}

.activity-ai-discussion__question-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  min-width: 28px;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  color: white;
  border-radius: 50%;
  font-size: 13px;
  font-weight: 700;
}

.activity-ai-discussion__discuss-prompt {
  font-size: 14px;
  color: #6b7280;
  font-style: italic;
  margin: 16px 0 8px 0;
  padding: 12px 16px;
  background: #fffbeb;
  border-left: 4px solid #f59e0b;
  border-radius: 0 8px 8px 0;
}

/* Summary phase */
.activity-ai-discussion__summary-label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: #374151;
  margin-bottom: 8px;
  margin-top: 8px;
}

.activity-ai-discussion__summary-textarea {
  margin-bottom: 12px;
}

/* Dig deeper iteration button */
.activity-ai-discussion__dig-deeper-btn {
  display: inline-block;
  background: transparent;
  color: #6366f1;
  border: 2px solid #6366f1;
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  margin-top: 8px;
  margin-left: 8px;
  transition: background 0.2s ease, color 0.2s ease;
}

.activity-ai-discussion__dig-deeper-btn:hover:not(:disabled) {
  background: #6366f1;
  color: white;
}

.activity-ai-discussion__dig-deeper-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.activity-ai-discussion__iteration-info {
  font-size: 13px;
  color: #6b7280;
  margin-top: 8px;
  font-style: italic;
}

/* Question selector dropdown (choose 1 of N) */
.activity-ai-discussion__selector {
  margin-bottom: 16px;
}

.activity-ai-discussion__selector-label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: #374151;
  margin-bottom: 8px;
}

.activity-ai-discussion__selector-dropdown {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid #e2e8f0;
  border-radius: 8px;
  font-family: inherit;
  font-size: 15px;
  color: #1e293b;
  background: white;
  cursor: pointer;
  transition: border-color 0.2s;
  appearance: auto;
}

.activity-ai-discussion__selector-dropdown:focus {
  outline: none;
  border-color: var(--activity-primary);
}

.activity-ai-discussion__selector-dropdown:disabled {
  background: #f1f5f9;
  color: #64748b;
  cursor: not-allowed;
}

/* Phase transitions */
.activity-ai-discussion__phase--discuss,
.activity-ai-discussion__phase--summarize {
  border-top: 1px solid #e5e7eb;
  padding-top: 20px;
  margin-top: 20px;
}

/* ============================================
   Author Name Section (roster-based activities)
   ============================================ */

.activity__author-section {
  background: var(--activity-primary-bg);
  border: 2px solid var(--activity-primary);
  border-radius: 12px;
  padding: 20px 24px;
  margin-bottom: 24px;
}

.activity__author-label {
  display: block;
  font-size: 16px;
  font-weight: 700;
  color: #1e293b;
  margin-bottom: 4px;
}

.activity__author-hint {
  font-size: 14px;
  color: #64748b;
  margin: 0 0 12px 0;
}

.activity__author-input {
  width: 100%;
  padding: 14px 16px;
  border: 2px solid #e2e8f0;
  border-radius: 8px;
  font-size: 16px;
  font-family: inherit;
  background: white;
  transition: border-color 0.2s;
}

.activity__author-input:focus {
  outline: none;
  border-color: var(--activity-primary);
}

/* ============================================
   Responsive Adjustments
   ============================================ */

@media (max-width: 600px) {
  .activity {
    padding: 16px;
  }

  .activity__title {
    font-size: 24px;
  }

  .activity-question {
    padding: 16px;
  }

  .activity-mc__option {
    padding: 12px 14px;
  }

  .activity__download-btn,
  .activity__canvas-link {
    padding: 14px 20px;
    font-size: 15px;
  }
}