/* ═══════════════════════════════════════════════════════════
   LMS — Learning Management System Styles
═══════════════════════════════════════════════════════════ */

/* ── Back Button ── */
.back-btn {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gray-200);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 18px;
  transition: background var(--transition);
  flex-shrink: 0;
}

.back-btn:hover {
  background: var(--gray-300);
}

/* ── Loading Spinner ── */
.loading-spinner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  gap: 16px;
  color: var(--text-muted);
}

.loading-spinner i {
  font-size: 32px;
  color: var(--gold);
}

/* ── Error & Empty States ── */
.error-state,
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  gap: 16px;
  text-align: center;
  color: var(--text-muted);
}

.error-state i,
.empty-state i {
  font-size: 48px;
  color: var(--text-muted);
}

.error-state p {
  color: var(--red);
}

/* ── LMS Header ── */
.lms-header-title {
  display: none;
}

.lms-header-title h1 {
  font-family: var(--font-display);
  font-size: 20px;
  letter-spacing: 1px;
}

/* ── Course List ── */
.course-list {
  padding-top: 8px;
}

.course-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.course-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
  border: 2px solid transparent;
}

.course-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.course-card:active {
  transform: scale(0.98);
}

.course-card.completed {
  border-color: var(--green);
}

.course-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 12px;
}

.course-card-icon {
  width: 48px;
  height: 48px;
  background: var(--gold);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 20px;
}

.course-card.completed .course-card-icon {
  background: var(--green);
}

.course-card-status {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
}

.course-card.completed .course-card-status {
  color: var(--green);
}

.course-card-title {
  font-family: var(--font-display);
  font-size: 22px;
  letter-spacing: 0.5px;
  color: var(--black);
  margin-bottom: 4px;
}

.course-card-meta {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.course-progress-bar {
  height: 6px;
  background: var(--gray-200);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: 8px;
}

.course-progress-fill {
  height: 100%;
  background: var(--gold);
  border-radius: var(--radius-full);
  transition: width 0.5s ease;
}

.course-card.completed .course-progress-fill {
  background: var(--green);
}

.course-card-footer {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
}

/* ── Course Detail ── */
.course-detail-container {
  padding-top: 8px;
}

.course-detail-header {
  margin-bottom: 24px;
}

.course-detail-title {
  font-family: var(--font-display);
  font-size: 28px;
  letter-spacing: 0.5px;
  color: var(--black);
}

.chapter-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.chapter-accordion {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.chapter-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  cursor: pointer;
  background: var(--white);
  transition: background var(--transition);
}

.chapter-header:hover {
  background: var(--gray-100);
}

.chapter-header-left {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.chapter-number {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--gold);
}

.chapter-name {
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: 0.5px;
  color: var(--black);
}

.chapter-arrow {
  font-size: 14px;
  color: var(--text-muted);
  transition: transform var(--transition);
}

.chapter-arrow.rotated {
  transform: rotate(180deg);
}

.chapter-content {
  display: none;
  padding: 0 20px 16px;
}

.chapter-content.open {
  display: block;
}

/* ── Item Rows (Lessons & Quizzes) ── */
.item-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition);
}

.item-row:hover:not(.locked) {
  background: var(--gray-100);
}

.item-row.locked {
  opacity: 0.5;
  cursor: not-allowed;
}

.item-icon {
  font-size: 20px;
  color: var(--text-muted);
  width: 24px;
  text-align: center;
}

.item-check {
  color: var(--green);
}

.item-lock {
  color: var(--text-muted);
}

.item-circle {
  color: var(--text-muted);
}

.item-quiz {
  color: var(--blue);
}

.item-info {
  flex: 1;
}

.item-name {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
}

.item-type {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.item-play {
  font-size: 14px;
  color: var(--text-muted);
}

/* ── Lesson View ── */
.lesson-container {
  padding-top: 8px;
}

.lesson-view {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.lesson-video-wrapper {
  width: 100%;
  background: var(--black);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.lesson-video {
  width: 100%;
  display: block;
  max-height: 400px;
  object-fit: contain;
}

.lesson-info {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}

.lesson-meta {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--gold);
  margin-bottom: 8px;
}

.lesson-title {
  font-family: var(--font-display);
  font-size: 24px;
  letter-spacing: 0.5px;
  color: var(--black);
  margin-bottom: 12px;
}

.lesson-completed-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(34, 197, 94, 0.1);
  color: var(--green);
  font-size: 12px;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: var(--radius-full);
}

.lesson-nav {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.lesson-nav-btn {
  flex: 1;
  min-width: 140px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 20px;
  background: var(--white);
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition);
}

.lesson-nav-btn:hover {
  border-color: var(--gold);
  color: var(--gold);
}

.lesson-nav-quiz {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--white);
}

.lesson-nav-quiz:hover {
  background: var(--gold-dark);
  border-color: var(--gold-dark);
  color: var(--white);
}

.lesson-complete-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 16px;
  background: var(--green);
  color: var(--white);
  font-size: 16px;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
}

.lesson-complete-btn:hover {
  background: #1ca550;
}

.lesson-complete-btn:active {
  transform: scale(0.98);
}

.lesson-complete-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.lesson-complete-btn.completed {
  background: var(--gray-200);
  color: var(--green);
}

.lesson-back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
  padding: 8px 0;
}

.lesson-back-link:hover {
  color: var(--gold);
}

/* ── Quiz View ── */
.quiz-container {
  padding-top: 8px;
}

.quiz-view {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.quiz-header {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  text-align: center;
}

.quiz-meta {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--gold);
  margin-bottom: 8px;
}

.quiz-title {
  font-family: var(--font-display);
  font-size: 24px;
  letter-spacing: 0.5px;
  color: var(--black);
  margin-bottom: 8px;
}

.quiz-info {
  font-size: 13px;
  color: var(--text-muted);
}

.quiz-passed-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 12px;
  background: rgba(34, 197, 94, 0.1);
  color: var(--green);
  font-size: 14px;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: var(--radius-full);
}

.quiz-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.quiz-questions {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.quiz-question {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}

.question-number {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--gold);
  margin-bottom: 8px;
}

.question-text {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 16px;
  line-height: 1.6;
}

.question-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.question-option {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--gray-100);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition);
}

.question-option:hover {
  background: var(--gray-200);
}

.question-option input[type="radio"] {
  width: 20px;
  height: 20px;
  accent-color: var(--gold);
  cursor: pointer;
}

.option-text {
  font-size: 14px;
  color: var(--text-primary);
}

.quiz-submit-btn {
  padding: 16px;
  background: var(--gold);
  color: var(--white);
  font-size: 16px;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
}

.quiz-submit-btn:hover {
  background: var(--gold-dark);
}

.quiz-submit-btn:active {
  transform: scale(0.98);
}

.quiz-submit-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.quiz-results {
  text-align: center;
  padding: 20px;
}

.quiz-score-display {
  font-family: var(--font-display);
  font-size: 72px;
  margin-bottom: 16px;
}

.quiz-score-display.passed {
  color: var(--green);
}

.quiz-score-display.failed {
  color: var(--red);
}

.quiz-result-message {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.quiz-result-message i {
  font-size: 24px;
}

.quiz-result-details {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.quiz-completed {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 40px 20px;
  box-shadow: var(--shadow-sm);
  text-align: center;
}

.quiz-completed p {
  color: var(--text-muted);
  margin-bottom: 24px;
}

.quiz-action-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  background: var(--gold);
  color: var(--white);
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition);
}

.quiz-action-btn:hover {
  background: var(--gold-dark);
}

.quiz-back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
  padding: 8px 0;
}

/* ── Certificate View ── */
.certificate-container {
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.certificate-iframe-wrapper {
  width: 100%;
  max-width: 800px;
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.certificate-iframe {
  width: 100%;
  min-height: 600px;
  border: none;
  display: block;
}

/* ── Responsive ── */
@media (min-width: 480px) {
  .course-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .lesson-nav-btn {
    flex: none;
  }
}

@media (min-width: 768px) {
  .course-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .course-detail-container,
  .lesson-container,
  .quiz-container {
    max-width: 600px;
    margin: 0 auto;
  }
}