/* =============================================================================== */
/* COURSE_DETAIL.CSS - 课程详情页个性化样式 (education-design-system.css配套版) */
/* 该文件仅包含与education-design-system.css配套的个性化样式 */
/* 通用样式(颜色、字体、间距、组件等)均从education-design-system.css继承 */
/* 专注于课程详情页特有布局的个性化定制 */
/* =============================================================================== */

/* =============================================================================== */
/* 通用区块样式 */
/* =============================================================================== */

.cd-section {
  background-color: var(--bg-color-primary);
  padding: var(--space-8);
  margin-bottom: var(--space-5);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-opacity);
  border-radius: var(--radius-md);
  border: 1px solid var(--white);
}

.cd-section.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.cd-section p {
  text-align: center;
}

.cd-section-title {
  font-size: var(--text-3xl);
  color: var(--text-color-secondary);
  margin-bottom: var(--space-3);
  padding-bottom: var(--space-3);
  font-weight: var(--font-weight-semibold);
  width: 100%;
  text-align: center;
  position: relative;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-opacity);
  overflow: hidden;
}

.cd-section.is-visible .cd-section-title {
  opacity: 1;
  transform: translateY(0);
}

.cd-course-description-content {
  font-size: var(--text-lg);
  color: var(--text-color-secondary);
  margin-bottom: var(--space-3);
  font-weight: var(--font-weight-normal);
  text-align: left;
}

.cd-course-description-content p {
  font-size: var(--text-base);
}

.cd-section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 100%;
  height: 2px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--text-color-brand) 30%,
    var(--text-color-brand) 50%,
    var(--text-color-brand) 70%,
    transparent 100%
  );
  border-radius: var(--radius-xs);
  transform: translateX(-50%);
  transition: var(--transition-height);
}

.cd-section:hover .cd-section-title::after {
  height: 5px;
}

.cd-description-content {
  font-size: var(--text-base);
  color: var(--text-color-secondary);
  margin-bottom: var(--space-3);
  font-weight: var(--font-weight-normal);
  text-align: center;
  line-height: var(--line-height-normal);
}

/* =============================================================================== */
/* 头部横幅 */
/* =============================================================================== */

.cd-course-header-banner {
  background-color: var(--bg-color-brand-light);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  margin-bottom: var(--space-8);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-opacity);
  border-radius: var(--radius-md);
  border: 1px solid var(--bg-color-brand-light);
}

@media (max-width: 768px) {
  .cd-course-header-banner {
    padding: var(--space-5);
  }
}

.cd-course-header-banner.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.cd-header-content-wrapper {
  gap: var(--space-9);
  align-items: center;
}

.cd-header-main-info {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-3);
  height: 100%;
}

.cd-course-title {
  font-size: var(--text-4xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-color-primary);
  margin-top: var(--space-3);
  margin-bottom: var(--space-3);
}

.cd-course-subtitle {
  font-size: var(--text-xl);
  color: var(--text-color-secondary);
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--border-color-default);
}

.cd-course-category-tag {
  display: inline-block;
  background-color: var(--bg-color-brand);
  color: var(--white);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  font-weight: var(--font-weight-medium);
}

.cd-course-category-tag i {
  color: var(--white);
}

.cd-highlights-list {
  list-style: none;
  padding: 0;
  margin-top: var(--space-3);
  margin-bottom: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.cd-highlights-list li {
  font-size: var(--text-base);
  color: var(--text-color-primary);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.cd-header-cta-buttons .btn {
  font-weight: var(--font-weight-semibold);
}

/* =============================================================================== */
/* 侧边栏价格和报名小组件 */
/* =============================================================================== */

.cd-sidebar-widget.cd-price-enroll-box {
  background-color: var(--bg-color-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-7);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  text-align: center;
}

.cd-price-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: calc(var(--space-3) * -1);
}

.cd-original-price {
  font-weight: var(--font-weight-medium);
  font-size: var(--text-3xl);
  color: var(--text-color-tertiary);
  text-decoration: line-through;
}

.cd-discount-badge-wrapper {
  position: absolute;
  right: var(--space-16);
  width: calc(var(--space-20) + var(--space-4));
  height: calc(var(--space-20) + var(--space-4));
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background-image: url('/static/courses/img/%E7%88%86%E7%82%B8.svg');
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  padding: 0;
  transform: rotate(10deg);
}

.cd-discount-badge,
.cd-discount-saved {
  background-color: transparent !important;
  color: var(--text-color-error) !important;
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-title);
}

.cd-discount-badge {
  font-size: var(--text-base);
}

.cd-discount-saved {
  font-size: var(--text-sm);
}

.cd-price-info {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: var(--space-3);
}

.cd-current-price {
  font-size: var(--text-5xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-color-brand);
}

.cd-enroll-deadline {
  font-size: var(--text-sm);
  color: var(--text-color-secondary);
  margin-bottom: 0;
}

.cd-enroll-tip {
  font-size: var(--text-xs);
  color: var(--text-color-secondary);
  padding: var(--space-3);
  background-color: var(--bg-color-secondary);
  border-radius: var(--radius-md);
}

.cd-header-contact-advisor {
  margin-top: auto;
  font-size: var(--text-sm);
  color: var(--text-color-secondary);
}

.cd-header-contact-advisor a {
  color: var(--text-color-brand);
  text-decoration: underline;
  font-weight: var(--font-weight-medium);
}

/* =============================================================================== */
/* 讲师与学员评价卡片 */
/* =============================================================================== */

.cd-instructor-card {
  display: flex;
  flex-direction: inherit;
  gap: var(--space-5);
}

.cd-instructor-card, .cd-review-card, .cd-highlight-item {
  padding: var(--space-5);
}

.cd-instructor-avatar {
  width: var(--space-20);
  height: var(--space-20);
  border-radius: 50%;
  object-fit: cover;
  box-shadow: var(--shadow-sm);
  border: 2px solid var(--bg-color-primary);
}

.cd-instructor-name {
  font-size: var(--text-xl);
  color: var(--text-color-primary);
  margin-bottom: var(--space-3);
  font-weight: var(--font-weight-semibold);
}

.cd-instructor-title {
  font-size: var(--text-sm);
  color: var(--text-color-brand);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-3);
}

.cd-instructor-bio {
  font-size: var(--text-sm);
  color: var(--text-color-secondary);
  line-height: var(--line-height-normal);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
  min-height: calc(var(--line-height-normal) * 3 * 1em);
}

.cd-review-card-header {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-5);
  margin-bottom: var(--space-3);
}

.cd-review-avatar {
  width: var(--space-20);
  height: var(--space-20);
  border-radius: 50%;
  object-fit: cover;
}

.cd-reviewer-name {
  font-size: var(--text-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-3);
}

.cd-review-stars {
  display: block;
  color: var(--text-color-warning);
  font-weight: var(--font-weight-medium);
}

.cd-review-text {
  font-size: var(--text-sm);
  line-height: var(--line-height-normal);
  color: var(--text-color-secondary);
}

/* =============================================================================== */
/* 课程大纲 - 手风琴 */
/* =============================================================================== */

.accordion .accordion-item {
  border: 1px solid var(--border-color-default);
  border-radius: var(--radius-base);
  margin-bottom: var(--space-3);
  overflow: hidden;
  transition: var(--transition-base);
}

.accordion .accordion-item:hover {
  border-color: var(--border-color-brand);
  box-shadow: var(--shadow-sm);
}

.accordion .accordion-item.is-open {
  border-color: var(--border-color-brand);
}

.accordion .accordion-header {
  background-color: var(--bg-color-secondary);
  padding: var(--space-5);
  width: 100%;
  text-align: left;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--space-5);
  font-size: var(--text-base);
  font-weight: var(--font-weight-semibold);
  color: var(--text-color-primary);
  transition: var(--transition-colors);
}

.accordion .accordion-item.is-open .accordion-header {
  background-color: var(--bg-color-brand-light);
  color: var(--text-color-brand);
}

.accordion .accordion-header:hover {
  background-color: var(--bg-color-tertiary);
}

.accordion .accordion-icon {
  margin-left: auto;
  font-size: var(--text-sm);
  transition: var(--transition-transform);
}

.accordion .accordion-item.is-open .accordion-icon {
  transform: rotate(180deg);
}

.accordion .accordion-content {
  background-color: var(--bg-color-primary);
  max-height: 0;
  overflow: hidden;
  transition: var(--transition-max-width);
}

.accordion .accordion-content-inner {
  padding: var(--space-5);
}

.cd-module-number {
  background-color: var(--bg-color-brand);
  color: var(--white);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-base);
  font-size: var(--text-base);
}

.accordion .accordion-item.is-open .cd-module-number {
  background-color: var(--bg-color-brand-dark);
}

.cd-module-title {
  flex-grow: 1;
  margin: 0;
  font-size: var(--text-lg);
}

.cd-module-duration {
  font-size: var(--text-sm);
  color: var(--text-color-secondary);
}

.cd-module-description {
  margin-bottom: var(--space-3);
  font-size: var(--text-base);
  color: var(--text-color-secondary);
}

.cd-lessons-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.cd-lesson-item {
  display: flex;
  align-items: center;
  padding: var(--space-2) 0;
  border-bottom: 1px dashed var(--border-color-default);
  font-size: var(--text-sm);
}

.cd-lesson-item:last-child {
  border-bottom: none;
}

.cd-lesson-title {
  flex-grow: 1;
}

/* =============================================================================== */
/* 学员评价 */
/* =============================================================================== */

.cd-reviews-summary-overall {
  text-align: center;
  margin-bottom: var(--space-5);
  background-color: var(--bg-color-brand-light);
  padding: var(--space-5);
  border-radius: var(--radius-base);
  border: 1px solid var(--bg-color-brand-light);
}

.cd-overall-rating-value {
  font-size: var(--text-4xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-color-brand);
  line-height: var(--line-height-none);
}

.cd-overall-stars {
  font-size: var(--text-3xl);
  color: var(--text-color-warning);
  margin-top: var(--space-3);
}

.cd-overall-stars i {
  color: var(--text-color-brand);
}

/* =============================================================================== */
/* 最终行动号召 */
/* =============================================================================== */

.cd-final-cta-section {
  text-align: center;
  padding: var(--space-16) 0 var(--space-10) 0;
  background: var(--bg-color-brand);
  color: var(--text-color-primary);
  border-radius: var(--radius-lg);
}

.cd-final-cta-section .cd-section-title {
  color: var(--white);
  white-space: nowrap;
  border-bottom-color: var(--border-color-light);
}

.cd-final-cta-section .cd-section-subtitle {
  color: var(--white);
}

.cd-final-cta-section p {
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

/* =============================================================================== */
/* 往期上课图集 */
/* =============================================================================== */

.cd-previous-student-item {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-base);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-base);
  aspect-ratio: 16 / 9;
}

.cd-previous-student-item:hover {
  transform: translateY(calc(var(--space-1) * -1.25));
  box-shadow: var(--shadow-lg);
}

.cd-previous-student-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-transform);
}

.cd-previous-student-image:hover {
  transform: scale(1.05);
}

/* =============================================================================== */
/* 响应式调整 */
/* =============================================================================== */

@media (max-width: 767px) {
  .cd-section {
    padding: var(--space-5);
  }

  .cd-section-title {
    font-size: var(--text-2xl);
  }

  .cd-course-title {
    font-size: var(--text-3xl);
  }

  .cd-course-subtitle {
    font-size: var(--text-lg);
  }

  .cd-highlight-item,
  .cd-instructor-card {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .cd-highlight-icon-wrapper {
    margin-right: 0;
    margin-bottom: var(--space-3);
  }
}

@media (max-width: 480px) {
  .cd-course-title {
    font-size: var(--text-2xl);
  }

  .cd-price-enroll-box .cd-current-price {
    font-size: var(--text-4xl);
  }
}

/* =============================================================================== */
/* 可访问性增强 */
/* =============================================================================== */

@media (prefers-reduced-motion: reduce) {
  .cd-section,
  .cd-course-header-banner,
  .cd-instructor-card,
  .cd-review-card,
  .cd-highlight-item {
    transition: none;
  }
}

@media (prefers-contrast: high) {
  .cd-section {
    border: 2px solid var(--border-color-default);
  }
  
  .cd-course-category-tag {
    border: 2px solid var(--border-color-brand);
  }
}

/* =============================================================================== */
/* 打印样式 */
/* =============================================================================== */

@media print {
  .cd-course-header-banner {
    background: none;
    box-shadow: none;
  }
  
  .cd-sidebar-widget.cd-price-enroll-box {
    display: none;
  }
  
  .cd-final-cta-section {
    background: none;
    color: var(--text-color-primary);
  }
}

/* =============================================================================== */
/* 性能优化 */
/* =============================================================================== */

.cd-section {
  contain: layout style paint;
}

.cd-section,
.cd-course-header-banner,
.cd-instructor-card,
.cd-review-card,
.cd-highlight-item {
  will-change: transform, opacity;
}

.cd-section {
  text-rendering: optimizeSpeed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.cd-course-header-banner {
  contain: layout;
}