/**
 * 이어보기 기능 스타일
 * @author 윤찬 (TwentyOz Inc.)
 * @version 1.0
 */

/* CSS 변수 정의 - 이어보기 시스템용 */
:root {
  --continue-primary: #6366f1;
  --continue-primary-hover: #4f46e5;
  --continue-secondary: #8b5cf6;
  --continue-secondary-hover: #7c3aed;
  --continue-success: #10b981;
  --continue-success-hover: #059669;
  --continue-warning: #f59e0b;
  --continue-danger: #ef4444;
  --continue-bg: #ffffff;
  --continue-bg-secondary: #f8fafc;
  --continue-border: #e5e7eb;
  --continue-text: #374151;
  --continue-text-light: #6b7280;
  --continue-text-muted: #9ca3af;
  --continue-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --continue-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --continue-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --continue-radius: 8px;
  --continue-radius-lg: 12px;
  --continue-radius-xl: 16px;
  --continue-transition: all 0.2s ease-in-out;
}

/* 다크 테마 */
[data-theme="dark"] {
  --continue-primary: #818cf8;
  --continue-primary-hover: #6366f1;
  --continue-secondary: #a78bfa;
  --continue-secondary-hover: #8b5cf6;
  --continue-success: #34d399;
  --continue-success-hover: #10b981;
  --continue-bg: #1f2937;
  --continue-bg-secondary: #111827;
  --continue-border: #374151;
  --continue-text: #f9fafb;
  --continue-text-light: #d1d5db;
  --continue-text-muted: #9ca3af;
  --continue-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.3), 0 1px 2px 0 rgba(0, 0, 0, 0.2);
  --continue-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
  --continue-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
}

@media (prefers-color-scheme: dark) {
  :root {
    --continue-primary: #818cf8;
    --continue-primary-hover: #6366f1;
    --continue-secondary: #a78bfa;
    --continue-secondary-hover: #8b5cf6;
    --continue-success: #34d399;
    --continue-success-hover: #10b981;
    --continue-bg: #1f2937;
    --continue-bg-secondary: #111827;
    --continue-border: #374151;
    --continue-text: #f9fafb;
    --continue-text-light: #d1d5db;
    --continue-text-muted: #9ca3af;
    --continue-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.3), 0 1px 2px 0 rgba(0, 0, 0, 0.2);
    --continue-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
    --continue-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
  }
}

/* 이어보기 메인 버튼 (히어로 섹션) */
.continue-learning-section {
  margin-top: 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.continue-learning-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 16px 32px;
  background: linear-gradient(135deg, var(--continue-primary), var(--continue-secondary));
  color: white;
  border: none;
  border-radius: var(--continue-radius-lg);
  font-size: 18px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: var(--continue-transition);
  box-shadow: var(--continue-shadow-lg);
  position: relative;
  overflow: hidden;
  min-width: 200px;
}

.continue-learning-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--continue-shadow-xl);
  background: linear-gradient(135deg, var(--continue-primary-hover), var(--continue-secondary-hover));
}

.continue-learning-btn:active {
  transform: translateY(0);
}

.continue-learning-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
}

.continue-learning-btn .btn-icon {
  width: 20px;
  height: 20px;
  transition: var(--continue-transition);
}

.continue-learning-btn.pulse {
  animation: continuePulse 2s infinite;
}

@keyframes continuePulse {
  0% {
    box-shadow: var(--continue-shadow-lg), 0 0 0 0 rgba(99, 102, 241, 0.4);
  }

  70% {
    box-shadow: var(--continue-shadow-xl), 0 0 0 10px rgba(99, 102, 241, 0);
  }

  100% {
    box-shadow: var(--continue-shadow-lg), 0 0 0 0 rgba(99, 102, 241, 0);
  }
}

/* 이어보기 정보 표시 */
.continue-info {
  text-align: center;
  color: var(--continue-text-light);
  font-size: 14px;
  max-width: 400px;
}

.continue-info .course-name {
  font-weight: 600;
  color: var(--continue-primary);
}

.continue-info .lecture-name {
  font-weight: 500;
  color: var(--continue-text);
}

/* 코스 카드 내 이어보기 버튼 */
.course-card__continue-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--continue-primary);
  color: white;
  border: none;
  border-radius: var(--continue-radius);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: var(--continue-transition);
  width: 100%;
  margin-top: 12px;
}

.course-card__continue-btn:hover {
  background: var(--continue-primary-hover);
  transform: translateY(-1px);
}

.course-card__continue-btn:active {
  transform: translateY(0);
}

.course-card__continue-btn .btn-icon {
  width: 16px;
  height: 16px;
}

.course-card__continue-btn.disabled {
  opacity: 0.5;
  cursor: not-allowed;
  background: var(--continue-text-muted);
}

.course-card__continue-btn.disabled:hover {
  transform: none;
  background: var(--continue-text-muted);
}

/* 학습 통계 섹션 */
.learning-stats-section {
  background: var(--continue-bg);
  border: 1px solid var(--continue-border);
  border-radius: var(--continue-radius-lg);
  padding: 24px;
  margin: 32px 0;
  box-shadow: var(--continue-shadow);
}

.learning-stats-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--continue-text);
  margin-bottom: 20px;
  text-align: center;
}

.learning-stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 16px;
}

.learning-stat-item {
  text-align: center;
  padding: 16px;
  background: var(--continue-bg-secondary);
  border-radius: var(--continue-radius);
  border: 1px solid var(--continue-border);
}

.learning-stat-value {
  display: block;
  font-size: 24px;
  font-weight: 700;
  color: var(--continue-primary);
  margin-bottom: 4px;
}

.learning-stat-label {
  font-size: 12px;
  color: var(--continue-text-light);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* 학습 추천 섹션 */
.learning-recommendations {
  margin: 32px 0;
}

.learning-recommendations-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--continue-text);
  margin-bottom: 16px;
}

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

.recommendation-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px;
  background: var(--continue-bg);
  border: 1px solid var(--continue-border);
  border-radius: var(--continue-radius);
  transition: var(--continue-transition);
}

.recommendation-item:hover {
  border-color: var(--continue-primary);
  box-shadow: var(--continue-shadow);
}

.recommendation-info {
  flex: 1;
}

.recommendation-course {
  font-size: 14px;
  font-weight: 600;
  color: var(--continue-text);
  margin-bottom: 4px;
}

.recommendation-lecture {
  font-size: 12px;
  color: var(--continue-text-light);
}

.recommendation-progress {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: 16px;
}

.recommendation-progress-bar {
  width: 60px;
  height: 4px;
  background: var(--continue-border);
  border-radius: 2px;
  overflow: hidden;
}

.recommendation-progress-fill {
  height: 100%;
  background: var(--continue-primary);
  transition: width 0.3s ease;
}

.recommendation-btn {
  padding: 8px 16px;
  background: var(--continue-primary);
  color: white;
  border: none;
  border-radius: var(--continue-radius);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--continue-transition);
  margin-left: 16px;
}

.recommendation-btn:hover {
  background: var(--continue-primary-hover);
}

/* 설정 및 관리 섹션 */
.learning-management {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--continue-border);
}

.learning-management-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--continue-text);
  margin-bottom: 16px;
}

.management-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.management-btn {
  padding: 10px 16px;
  border: 1px solid var(--continue-border);
  border-radius: var(--continue-radius);
  background: var(--continue-bg);
  color: var(--continue-text);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--continue-transition);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.management-btn:hover {
  border-color: var(--continue-primary);
  color: var(--continue-primary);
}

.management-btn.danger {
  color: var(--continue-danger);
  border-color: var(--continue-danger);
}

.management-btn.danger:hover {
  background: var(--continue-danger);
  color: white;
}

.management-btn .btn-icon {
  width: 16px;
  height: 16px;
}

/* 빈 상태 표시 */
.continue-empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--continue-text-light);
}

.continue-empty-state .empty-icon {
  font-size: 48px;
  margin-bottom: 16px;
  opacity: 0.5;
}

.continue-empty-state .empty-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--continue-text);
  margin-bottom: 8px;
}

.continue-empty-state .empty-description {
  font-size: 14px;
  max-width: 400px;
  margin: 0 auto;
}

/* 모바일 대응 */
@media (max-width: 768px) {
  .continue-learning-btn {
    font-size: 16px;
    padding: 14px 24px;
    min-width: 180px;
  }

  .learning-stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .learning-stat-item {
    padding: 12px;
  }

  .learning-stat-value {
    font-size: 20px;
  }

  .recommendation-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .recommendation-progress,
  .recommendation-btn {
    margin-left: 0;
  }

  .management-actions {
    flex-direction: column;
  }

  .management-btn {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .continue-learning-section {
    margin-top: 24px;
  }

  .continue-learning-btn {
    font-size: 15px;
    padding: 12px 20px;
    min-width: 160px;
  }

  .learning-stats-section {
    padding: 16px;
  }

  .learning-stats-grid {
    grid-template-columns: 1fr;
  }

  .learning-stat-value {
    font-size: 18px;
  }
}

/* 로딩 상태 */
.continue-loading {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  opacity: 0.7;
}

.continue-loading .loading-spinner {
  width: 16px;
  height: 16px;
  border: 2px solid currentColor;
  border-top: 2px solid transparent;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }

  to {
    transform: rotate(360deg);
  }
}

/* 접근성 개선 */
@media (prefers-reduced-motion: reduce) {

  .continue-learning-btn,
  .course-card__continue-btn,
  .recommendation-item,
  .management-btn {
    transition: none;
    animation: none;
  }

  .continue-learning-btn.pulse {
    animation: none;
  }
}

/* 고대비 모드 */
@media (prefers-contrast: high) {

  .continue-learning-btn,
  .course-card__continue-btn,
  .recommendation-btn,
  .management-btn {
    border: 2px solid currentColor;
  }
}

/* 포커스 스타일 */
.continue-learning-btn:focus-visible,
.course-card__continue-btn:focus-visible,
.recommendation-btn:focus-visible,
.management-btn:focus-visible {
  outline: 2px solid var(--continue-primary);
  outline-offset: 2px;
}