/* =============================================================================== */
/* HOME.CSS - 首页个性化样式 (education-design-system.css配套版) */
/* =============================================================================== */

/* =============================================================================== */
/* 页面基础样式 */
/* =============================================================================== */
body {
  background-color: var(--white)!important;
}

.main-container,
.home-container {
  padding: 0 !important;
}

.section-card {
  margin-top: var(--space-8);
}

.section-subtitle {
  text-align: center;
  font-size: var(--text-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--text-color-primary);
  margin-bottom: var(--space-3);
}

/* =============================================================================== */
/* 区块通用样式 */
/* =============================================================================== */

/* 区块基础样式 */
.hero-section-wrapper,
.home-statistics-section,
.star-teachers-section,
.recommended-courses-section,
.how-to-learn-section,
.platform-advantages-section,
.student-feedback-section,
.home-faq-section,
.partners-section {
  position: relative;
  display: flex;
  align-items: center;
  padding: var(--space-20) 0 var(--space-20) 0;
  transition: background 0.5s ease;
}


/* 懒加载背景图片 */
.hero-section-wrapper,
.home-statistics-section.lazy-bg,
.star-teachers-section.lazy-bg,
.recommended-courses-section.lazy-bg,
.how-to-learn-section.lazy-bg,
.platform-advantages-section.lazy-bg,
.student-feedback-section.lazy-bg,
.home-faq-section.lazy-bg {
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    transition: background-image 0.3s ease;
}

/* Hero背景立即加载（关键内容） */
.hero-section-wrapper {
    background: url('../image/bg-10(3).png');
    /* 自适应图片大小，高度为100%，宽度拉伸到100%*/
    background-size: 100% 100%;
    background-position: center;
    background-repeat: no-repeat;
}

/* 其他背景通过JS懒加载，CSS中不设置默认背景 */
.star-teachers-section.lazy-bg:not(.bg-loaded),
.recommended-courses-section.lazy-bg:not(.bg-loaded),
.how-to-learn-section.lazy-bg:not(.bg-loaded),
.platform-advantages-section.lazy-bg:not(.bg-loaded),
.student-feedback-section.lazy-bg:not(.bg-loaded) {
    background-color: var(--bg-color-secondary, #f5f5f5);
}


.section-meta h2 {
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
  margin-bottom: var(--space-2);
}

/* 区块间距 */
.section-meta:nth-child(n) {
  text-align: center;
  margin-bottom: var(--space-6);
}

.section-meta .section-title-description {
  font-size: var(--text-sm);
  color: var(--text-color-tertiary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.section-meta .section-title-description::before {
  content: '';
  flex-grow: 1;
  height: 1px;
  background: linear-gradient(to left, var(--neutral-200), transparent);
}

.section-meta .section-title-description::after {
  content: '';
  flex-grow: 1;
  height: 1px;
  background: linear-gradient(to right, var(--neutral-200), transparent);
}

.advantages-wrapper > * {
  margin-bottom: var(--space-12);
}

.advantages-wrapper > *:last-child {
  margin-bottom: 0;
}

/* =============================================================================== */
/* 英雄区块样式 */
/* =============================================================================== */

.hero-section-wrapper {
  min-height: var(--space-100);
}

.hero-section {
  margin-top: var(--space-50);
}

.hero-section h1 {
  font-size: var(--text-5xl);
  color: var(--text-color-brand);
  font-weight: var(--font-weight-bold);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
  margin-bottom: var(--space-2)!important;
}

.hero-section p {
  font-size: var(--text-base);
  color: var(--text-color-secondary);
  max-width: 60ch;
  margin-bottom: var(--space-6);
}

/* =============================================================================== */
/* 教师卡片样式 */
/* =============================================================================== */
.teacher-card {
  max-width: 600px;
}

.section-card .card {
  padding: 0;
}

.star-teachers-section .card {
  border: none;
}

.star-teachers-section .section-card {
  place-items: center;
}

.teacher-image {
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background-color: var(--bg-color-secondary);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.teacher-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-transform);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.card:hover .teacher-image img {
  transform: scale(1.05);
}

.teacher-info {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-5) var(--space-6) var(--space-6) var(--space-6);
}

.teacher-info__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
}

.teacher-name {
  color: var(--neutral-600)!important;
  font-size: var(--text-lg);
  margin: 0;
}

.teacher-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.teacher-desc {
  font-size: var(--text-sm);
  line-height: var(--line-height-normal);
  flex-grow: 1;
  overflow: hidden;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  line-clamp: 2;
  -webkit-line-clamp: 2;
  min-height: calc(var(--text-sm) * 1.3 * 2);
  margin: 0;
  padding: 0;
}

.teacher-time {
  font-size: var(--text-sm);
  color: var(--text-color-tertiary);
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
}

.teacher-timeactions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.teacher-actions {
  display: flex;
  justify-content: flex-end;
}

/* =============================================================================== */
/* 推荐课程区块样式 - 轮播图 */
/* =============================================================================== */

.courses-carousel-container {
  overflow: hidden;
  position: relative;
  border-radius: var(--radius-lg);
  border: none;
}

.courses-carousel-slides-wrapper {
  position: relative;
  width: 100%;
  min-height: 380px;
}

.courses-carousel-slide {
  position: absolute;
  top: 0;
  left: 5%;
  width: 90%;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.8s ease-in-out, visibility 0.8s ease-in-out;
  box-sizing: border-box;
  border: none;
}

.courses-carousel-slide.active {
  opacity: 1;
  visibility: visible;
  position: relative;
}

.course-slide-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-radius: var(--radius-lg);
  overflow: hidden;
  height: 100%;
  background-color: var(--bg-color-primary);
}

.course-slide-image {
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}

.course-slide-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-transform);
  border-radius: var(--radius-lg);
}

.course-slide-card:hover .course-slide-image img {
  transform: scale(1.02);
}

.course-slide-details {
  padding: var(--space-6) var(--space-6) var(--space-6) 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.course-slide-title {
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-semibold);
  margin: var(--space-2) 0 var(--space-3);
  color: var(--neutral-600);
  /* 文字超出1行省略 */
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
}

.course-slide-title span {
  background: var(--info-50);
  font-size: var(--text-base);
  padding: var(--space-2) var(--space-4);
}

.course-slide-description {
  font-size: var(--text-base);
  color: var(--text-color-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-6);
}

.course-slide-actions {
  text-align: right;
}

.link-arrow {
  color: var(--text-color-brand);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  transition: var(--transition-color);
}

.link-arrow:hover {
  color: var(--brand-600);
}

.link-arrow::after {
  content: ' →';
  transition: transform 0.2s;
  display: inline-block;
}

.link-arrow:hover::after {
  transform: translateX(4px);
}

.link-arrow:focus {
  outline: 2px solid var(--brand-500);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.carousel-dots-wrapper {
  position: relative;
  width: 100%;
  padding: var(--space-3) 0;
}

.carousel-dots {
  display: flex;
  justify-content: center;
  gap: var(--space-2);
  margin: 0;
}

.courses-carousel-slide:not(.active) .carousel-dots-wrapper {
  display: none;
}

.dot {
  width: 10px;
  height: 10px;
  border: 1px solid var(--neutral-200);
  border-radius: var(--radius-base);
  cursor: pointer;
  transition: var(--transition-all);
}

.dot.active {
  width: var(--space-5);
  background-color: var(--neutral-400);
  transform: scale(1.2);
}

.dot:focus {
  outline: 2px solid var(--neutral-500);
  outline-offset: 2px;
}

/* 轮播图导航按钮 */
.carousel-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background-color: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--neutral-200);
  border-radius: 50%;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 10;
  transition: all 0.3s ease;
  font-size: var(--text-2xl);
  color: var(--neutral-700);
  padding: 0;
  min-width: 44px;
  min-height: 44px;
}

.carousel-nav:hover {
  background-color: var(--bg-color-primary);
  border-color: var(--brand-500);
  color: var(--brand-600);
  transform: translateY(-50%) scale(1.1);
}

.carousel-nav:focus {
  outline: 2px solid var(--brand-500);
  outline-offset: 2px;
}

.carousel-nav:active {
  transform: translateY(-50%) scale(0.95);
}

.carousel-nav-prev {
  left: var(--space-4);
}

.carousel-nav-next {
  right: var(--space-4);
}

/* =============================================================================== */
/* 平台优势区块样式 */
/* =============================================================================== */

.recommended-courses-section .grid-layout-1-2,
.platform-advantages-section .grid-layout-1-2,
.platform-advantages-section .grid-layout-2-1 {
  align-items: center;
}

.advantages-info {
  display: flex;
  flex-direction: column;
  justify-content: center;
  height: 100%;
  margin: var(--space-3) var(--space-6);
}

.advantages-info h4 {
  font-weight: var(--font-weight-normal);
  color: var(--neutral-500);
  margin-bottom: var(--space-3);
}

.advantages-info p {
  color: var(--text-color-primary);
  line-height: var(--line-height-relaxed);
}

.advantages-info-description {
  font-size: var(--text-sm);
  color: var(--text-color-secondary);
  line-height: var(--line-height-relaxed);
}

.advantages-image {
  border: none;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: var(--radius-lg);
  margin: var(--space-6);
}

.advantages-image:hover {
  transform: scale(1.01);
  transition: var(--transition-transform);
}

.advantages-image img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  margin-top: auto;
  border-radius: var(--radius-lg);
  /* 四周羽化遮罩：使用矩形边缘羽化 (Mask Composite) */
  /* 定义羽化边缘的宽度 */
  --mask-fade-size: 30px; 

  /* 水平方向遮罩：左右两边透明，中间实色 */
  --mask-horizontal: linear-gradient(to right, 
      transparent, 
      black var(--mask-fade-size), 
      black calc(100% - var(--mask-fade-size)), 
      transparent
  );

  /* 垂直方向遮罩：上下两边透明，中间实色 */
  --mask-vertical: linear-gradient(to bottom, 
      transparent, 
      black var(--mask-fade-size), 
      black calc(100% - var(--mask-fade-size)), 
      transparent
  );

  /* 应用遮罩：取两个方向的交集，形成矩形羽化效果 */
  -webkit-mask-image: var(--mask-horizontal), var(--mask-vertical);
  -webkit-mask-composite: source-in;
  mask-image: var(--mask-horizontal), var(--mask-vertical);
  mask-composite: intersect;
}

/* =============================================================================== */
/* 数据统计区块样式 */
/* =============================================================================== */

.home-statistics-section {
  padding: var(--space-30) 0 var(--space-10) 0;
  /* 备用背景：如果背景图片加载失败，显示渐变背景 */
  background: linear-gradient(135deg, var(--brand-50, #eff6ff) 0%, var(--brand-100, #dbeafe) 100%);
}

.statistics-list {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  align-items: stretch;
  gap: var(--space-6);
}

.statistic-card {
  flex: 1 1 0;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: var(--space-6);
  background: var(--white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--neutral-100);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.statistic-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
  background: var(--bg-color-primary, #ffffff);
}

.statistic-icon-wrapper {
  width: var(--space-16);
  height: var(--space-16);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-50);
  border-radius: 50%;
}

.statistic-icon-wrapper i {
  font-size: var(--text-2xl);
  color: var(--primary-600);
}

.statistic-icon-wrapper img {
  width: var(--space-12);
  height: var(--space-12);
  object-fit: contain;
  border-radius: 50%;
}

.statistic-content {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.statistic-number {
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--primary-600);
  line-height: var(--line-height-tight);
}

.statistic-label {
  font-size: var(--text-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--text-color-primary);
}

.statistic-description {
  font-size: var(--text-ty);
  color: var(--text-color-secondary);
  line-height: var(--line-height-relaxed);
}

/* =============================================================================== */
/* 学习流程区块样式 */
/* =============================================================================== */

.learning-process-list {
  display: flex;
  flex-wrap: nowrap;
  justify-content: space-between;
  align-items: stretch;
  gap: var(--space-9);
  padding: var(--space-8) var(--space-4) var(--space-12) var(--space-4);
  background: hsla(0, 0%, 99%, .3);
  border: 2px solid hsla(0, 0%, 100%, .7);
  border-radius: var(--space-4);
}

.process-step {
  flex: 1 1 0;
  min-width: 0;
  position: relative;
  display: flex;
  align-items: stretch;
}

.process-step-content {
  flex: 1;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--space-4);
  background: var(--bg-color-primary, #ffffff);
  border-radius: var(--radius-lg);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  position: relative;
}


.process-step-content .active,
.process-step-content:hover {
  background: var(--primary-300);
  transform: translateY(-4px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
  color: var(--white);
}

.process-step-content .active svg,
.process-step-content:hover i {
  color: var(--primary-600);
}

.process-step-content .active h3,
.process-step-content:hover h3 {
  color: var(--white);
}

.process-step-content .active p,
.process-step-content:hover p {
  color: var(--white);
}

.step-actions a {
  font-size: var(--text-sm);
  text-decoration: none;
}
.step-actions a:hover {
  color: var(--info-700);
  text-decoration: underline;
}

.step-header {
  position: relative;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: var(--space-3);
}

.step-number {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  width: var(--space-8);
  height: var(--space-8);
  background: var(--brand-500, #3b82f6);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-bold);
  font-size: var(--text-sm);
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
  z-index: 1;
}

.step-icon-wrapper {
  width: var(--space-16);
  height: var(--space-16);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--brand-50, #eff6ff);
  border-radius: 50%;
  margin-top: var(--space-2);
  margin-bottom: var(--space-2);
}

.step-icon-wrapper i {
  font-size: var(--text-2xl);
  color: var(--primary-600);
}

.step-icon-wrapper img {
  width: var(--space-12);
  height: var(--space-12);
  object-fit: contain;
  border-radius: 50%;
}

.step-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  width: 100%;
  min-height: 0;
}

.step-title {
  font-size: var(--text-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--text-color-primary);
  margin-bottom: var(--space-2);
  line-height: var(--line-height-tight);
}

.step-description {
  font-size: var(--text-sm);
  color: var(--text-color-secondary);
  line-height: var(--line-height-relaxed);
  flex: 1;
  min-height: 0;
  margin-bottom: var(--space-3);
}

.step-connector {
  position: absolute;
  right: -40px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--neutral-400);
  font-size: var(--text-xl);
  z-index: 2;
  background: transparent;
  width: var(--space-10);
  height: var(--space-10);
}

.step-connector i {
  color: var(--neutral-400);
  animation: pulse 2s ease-in-out infinite;
}


/* =============================================================================== */
/* 学员反馈区块样式 */
/* =============================================================================== */

.testimonial {
  border:none;
  box-shadow: 0px 4px 20px 0px rgba(0, 0, 0, 0.1);
}

.testimonial-list {
  padding: 0 var(--space-6);
}

.testimonial-item {
  margin-bottom: var(--space-6);
}

.testimonial-item:last-child {
  margin-bottom: 0;
}

.testimonial .card-body {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.testimonial-avatar {
  width: var(--space-30);
  height: var(--space-30);
  border-radius: 50%;
  object-fit: cover;
  box-shadow: var(--shadow-base);
  padding: var(--space-1);
  border: 2px solid var(--neutral-100);
  image-rendering: auto; 
  place-self: center;
}

.testimonial-content {
  font-style: italic;
  margin-top: var(--space-3);
  color: var(--text-color-secondary);
  flex-grow: 1;
  position: relative;
  padding: var(--space-3);
}

.testimonial-content::before,
.testimonial-content::after {
  content: '"';
  font-size: var(--text-4xl);
  color: var(--primary-200);
  position: absolute;
  line-height: var(--line-height-none);
  margin-top: auto;
}

.testimonial-content::before {
  top: -0.5rem;
  left: -0.5rem;
}

.testimonial-content::after {
  content: '"';
  bottom: -1.5rem;
  right: -0.5rem;
}

.testimonial-author {
  color: var(--neutral-400);
  margin-top: auto;
  text-align: end;
}

.testimonial-author span {
  color: var(--neutral-400);
  text-decoration: none;
}

.testimonial-author span:hover {
  color: var(--brand-500);
}

/* =============================================================================== */
/* 学员反馈3D金字塔卡片堆叠转轮效果 */
/* =============================================================================== */

.testimonial-carousel-wrapper {
  position: relative;
  width: 100%;
  height: 500px;
  overflow: hidden;
  margin: var(--space-3) 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.testimonial-carousel-container {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.testimonial-carousel-track {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.testimonial-carousel-item {
  position: absolute;
  width: 900px;
  height: var(--space-80);
  left: 50%;
  top: 50%;
  margin-left: -400px;
  margin-top: -150px;
  transform: translateX(var(--carousel-translate-x, 0)) scale(var(--carousel-scale, 1));
  opacity: var(--carousel-opacity, 1);
  z-index: var(--carousel-z-index, 1);
  transition: transform 0.8s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.8s ease, z-index 0.8s ease;
  will-change: transform, opacity, z-index;
  pointer-events: auto;
}

.testimonial-carousel-wrapper:hover .testimonial-carousel-item {
  transition-duration: 0.3s;
}

.testimonial-carousel-item .testimonial-item {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  background-color: var(--bg-color-primary);
  transition: transform 0.3s ease;
  backface-visibility: hidden;
}


/* =============================================================================== */
/* 常见问题区块样式 */
/* =============================================================================== */

.faq-list {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.faq-item {
  margin-bottom: var(--space-3);
  background: var(--bg-color-primary, #ffffff);
  border-radius: var(--radius-lg);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  overflow: hidden;
  transition: box-shadow 0.3s ease;
}

.faq-item:hover {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-4) var(--space-5);
  background: transparent;
  border: none;
  text-align: left;
  cursor: pointer;
  font-size: var(--text-base);
  font-weight: var(--font-weight-semibold);
  color: var(--text-color-primary);
  transition: background-color 0.3s ease;
}

.faq-question:hover {
  background-color: var(--neutral-50, #fafafa);
}

.faq-question:focus {
  outline-offset: -2px;
}

.faq-question-text {
  flex: 1;
  padding-right: var(--space-3);
}

.faq-icon {
  flex-shrink: 0;
  transition: transform 0.3s ease;
  color: var(--neutral-600);
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0 var(--space-5);
}

.faq-item.active .faq-answer {
  max-height: 1000px;
  padding: 0 var(--space-5) var(--space-4) var(--space-5);
}

.faq-answer-content {
  color: var(--text-color-secondary);
  line-height: var(--line-height-relaxed);
  padding-top: var(--space-2);
}


/* =============================================================================== */
/* 占位符样式覆盖 */
/* =============================================================================== */

.advantages-image.placeholder-image {
  aspect-ratio: 16 / 9;
}

.testimonial .placeholder-avatar {
  width: var(--space-20);
  height: var(--space-20);
  border-radius: 50%;
}

/* =============================================================================== */
/* 响应式优化 */
/* =============================================================================== */

/* 焦点状态优化 */
button:focus-visible,
a:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid var(--brand-500);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* 跳过链接（无障碍） */
.skip-to-main {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--brand-600);
  color: white;
  padding: var(--space-2) var(--space-4);
  text-decoration: none;
  z-index: 1000;
  border-radius: 0 0 var(--radius-md) 0;
}

.skip-to-main:focus {
  top: 0;
}

/* =============================================================================== */
/* 合作伙伴区块样式 */
/* =============================================================================== */

.partners-section {
  padding: var(--space-12) 0 var(--space-16) 0;
}

.partners-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-6);
  margin-top: var(--space-8);
  align-items: center;
}

.partner-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: transform 0.3s ease;
}

.partner-item:hover {
  transform: translateY(-4px);
}

.partner-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  text-decoration: none;
  color: inherit;
  transition: opacity 0.3s ease;
}

.partner-link:hover {
  opacity: 0.8;
}

.partner-link:focus {
  outline: 2px solid var(--brand-500);
  outline-offset: var(--space-5);
  border-radius: var(--radius-base);
}

.partner-logo-wrapper {
  width: 100%;
  max-width: var(--space-50);
  height: var(--space-30);
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-color-primary, #ffffff);
  border-radius: var(--radius-base);
  padding: var(--space-4);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  transition: box-shadow 0.3s ease;
  overflow: hidden;
}

.partner-item:hover .partner-logo-wrapper {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
}

.partner-logo-wrapper img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  filter: grayscale(100%);
  opacity: 0.7;
  transition: all 0.3s ease;
}

.partner-item:hover .partner-logo-wrapper img {
  filter: grayscale(0%);
  opacity: 1;
}

.partner-logo-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--neutral-100) 0%, var(--neutral-50) 100%);
  border-radius: var(--radius-sm);
}

.partner-name-text {
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  color: var(--neutral-600);
  text-align: center;
  padding: var(--space-2);
  word-break: break-word;
}

.partner-description {
  margin-top: var(--space-3);
  font-size: var(--text-xs);
  color: var(--text-color-secondary);
  text-align: center;
  line-height: var(--line-height-relaxed);
  max-width: var(--space-50);
}

/* =============================================================================== */
/* Slot转轮式选项卡样式 */
/* =============================================================================== */

/* slot-wrapper 基础样式 */
.slot-wrapper {
  position: relative;
  width: 100%;
  margin-top: var(--space-8);
}

/* slot-nav 转轮导航样式 - 连续滚动 */
.slot-nav {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  overflow: hidden;
}

.slot-nav-container {
  display: flex;
  align-items: center;
  justify-content: center;
  will-change: transform;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

.slot-nav-item {
  flex: 0 0 auto;
  width: 46%;
  cursor: pointer;
  transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  user-select: none;
  transform: translateX(var(--slot-translate-x, 0)) scale(var(--slot-scale, 1));
}

/* 清晰度控制：50% 75% 100% 75% 50% */
.slot-nav-item[data-position="0"] {
  opacity: 0.25;
}

.slot-nav-item[data-position="1"] {
  opacity: 0.75;
}

.slot-nav-item[data-position="2"] {
  z-index: 2;
}

.slot-nav-item[data-position="3"] {
  opacity: 0.75;
}

.slot-nav-item[data-position="4"] {
  opacity: 0.25;
}

.slot-nav-item:hover {
  border-color: var(--brand-300);
}

.slot-nav-item.active {
  opacity: 1;
  border-color: var(--brand-500);
  z-index: 2;
  transform: translateX(var(--slot-translate-x, 0)) scale(var(--slot-scale, 1.02));
}

.slot-nav-item .advantages-info {
  pointer-events: none;
}

.slot-nav-item.active .advantages-info h4 {
  color: var(--brand-500);
}

/* 描述文本基础样式 */
.slot-nav-item .advantages-info-description {
  max-height: 0;
  overflow: hidden;
  transition: opacity 0.5s cubic-bezier(0.4, 0, 0.2, 1), max-height 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.slot-nav-item.active .advantages-info-description {
  max-height: var(--space-50); /* 足够大的值 */
  /* 最多显示3行，超出显示... */
  display: -webkit-box;
  -webkit-box-orient: vertical;
  line-clamp: 3;
  -webkit-line-clamp: 3;
  overflow: hidden;
  text-overflow: ellipsis;
  word-break: break-all;
  word-wrap: break-word;
}

/* 切换过程中的动画控制 */
.slot-nav-item.hiding .advantages-info-description {
  opacity: 0;
  max-height: 0;
}

.slot-nav-item.showing .advantages-info-description {
  opacity: 1;
  max-height: var(--space-50);
}


/* slot-content 轮播内容样式 */
.slot-content {
  position: relative;
  width: 100%;
  min-height: var(--space-100);
  overflow: hidden;
  border-radius: var(--radius-lg);
}

.slot-content-item {
  padding: var(--space-4);
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.8s ease-in-out, visibility 0.8s ease-in-out;
}

.slot-content-item.active {
  opacity: 1;
  visibility: visible;
  position: relative;
}

.slot-content-item .advantages-image {
  width: 60%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: var(--radius-lg);
  margin: 0;
  place-self: center;
}

.slot-content-item .advantages-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
  position: relative;
  z-index: 2;
}

/* 使用伪元素创建左右模糊边框效果 */
.slot-content-item .advantages-image img::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  /* 创建左右两侧模糊遮罩，中间80%保持清晰 */
  background: linear-gradient(
    to right,
    rgba(0, 0, 0, 0.7) 0%,
    rgba(0, 0, 0, 0.7) 10%,
    transparent 10%,
    transparent 90%,
    rgba(0, 0, 0, 0.7) 90%,
    rgba(0, 0, 0, 0.7) 100%
  );
  /* 对遮罩应用模糊效果 */
  filter: blur(10px);
  z-index: 1;
}

.slot-content-item.active .advantages-image:hover img {
  transform: scale(1.02);
}

/* slot-indicator 指示器样式 */
.slot-indicator {
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  transform: translateY(-50%);
  display: flex;
  justify-content: space-between;
  padding: 0 var(--space-4);
  pointer-events: none;
  z-index: 10;
}

.slot-indicator-item {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--neutral-200);
  border-radius: 50%;
  cursor: pointer;
  pointer-events: all;
  transition: all 0.3s ease;
  color: var(--neutral-700);
  font-size: var(--text-xl);
}

.slot-indicator-item:hover {
  background-color: var(--bg-color-primary);
  border-color: var(--brand-500);
  color: var(--brand-600);
  transform: scale(1.1);
}

.slot-indicator-item:active {
  transform: scale(0.95);
}

.slot-indicator-item:focus {
  outline: 2px solid var(--brand-500);
  outline-offset: 2px;
}

.slot-indicator-item i {
  display: inline-block;
}

/* =============================================================================== */
/* 移动端响应式适配 - 按区块组织 */
/* =============================================================================== */

/* =============================================================================== */
/* 1. 英雄区块移动端适配 */
/* =============================================================================== */

@media (max-width: 768px) {
  .hero-section {
    margin-top: var(--space-20);
  }

  .hero-section h1 {
    font-size: var(--text-3xl);
    margin-bottom: var(--space-3) !important;
  }

  .hero-section p {
    font-size: var(--text-base);
    max-width: 100%;
    margin-bottom: var(--space-4);
  }
}

@media (max-width: 480px) {
  .hero-section {
    margin-top: var(--space-16);
  }

  .hero-section h1 {
    font-size: var(--text-2xl);
  }

  .hero-section p {
    font-size: var(--text-sm);
  }
}

/* =============================================================================== */
/* 2. 区块通用样式移动端适配 */
/* =============================================================================== */

@media (max-width: 768px) {
  .hero-section-wrapper,
  .home-statistics-section,
  .star-teachers-section,
  .recommended-courses-section,
  .how-to-learn-section,
  .platform-advantages-section,
  .student-feedback-section,
  .home-faq-section,
  .partners-section {
    padding: var(--space-8) 0 var(--space-16) 0;
  }

  .section-meta h2.section-title {
    font-size: var(--text-2xl);
    margin-bottom: var(--space-4);
  }

  .section-meta .section-title-description {
    font-size: var(--text-sm);
    margin-top: var(--space-2);
  }
}

@media (max-width: 480px) {
  .hero-section-wrapper,
  .home-statistics-section,
  .star-teachers-section,
  .recommended-courses-section,
  .how-to-learn-section,
  .platform-advantages-section,
  .student-feedback-section,
  .home-faq-section,
  .partners-section {
    padding: var(--space-6) 0 var(--space-12) 0;
  }

  .section-meta h2.section-title {
    font-size: var(--text-xl);
  }

  .section-meta .section-title-description {
    font-size: var(--text-xs);
  }
}

/* =============================================================================== */
/* 3. 数据统计区块移动端适配 */
/* =============================================================================== */

@media (max-width: 768px) {
  .home-statistics-section {
    padding: var(--space-8) 0 var(--space-16) 0;
  }

  .statistics-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-4);
  }

  .statistic-card {
    max-width: 100%;
    width: 100%;
    padding: var(--space-5);
  }

  .statistic-icon-wrapper {
    width: var(--space-14);
    height: var(--space-14);
  }

  .statistic-icon-wrapper img {
    width: var(--space-10);
    height: var(--space-10);
  }

  .statistic-icon-wrapper i {
    font-size: var(--text-xl);
  }

  .statistic-number {
    font-size: var(--text-xl);
  }

  .statistic-label {
    font-size: var(--text-sm);
  }
}

@media (max-width: 480px) {
  .statistic-card {
    padding: var(--space-4);
  }

  .statistic-icon-wrapper {
    width: var(--space-12);
    height: var(--space-12);
  }

  .statistic-icon-wrapper img {
    width: var(--space-9);
    height: var(--space-9);
  }

  .statistic-number {
    font-size: var(--text-lg);
  }

  .statistic-label {
    font-size: var(--text-xs);
  }
}

/* =============================================================================== */
/* 4. 教师卡片区块移动端适配 */
/* =============================================================================== */

@media (max-width: 768px) {
  .teacher-info {
    padding: var(--space-5);
    gap: var(--space-3);
  }

  .teacher-info__header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
  }

  .teacher-name {
    font-size: var(--text-lg);
    width: 100%;
  }

  .teacher-tags {
    gap: var(--space-2);
    width: 100%;
  }

  .teacher-desc {
    font-size: var(--text-sm);
    margin-bottom: var(--space-3);
  }

  .teacher-timeactions {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
    width: 100%;
  }

  .teacher-actions {
    width: 100%;
    justify-content: flex-start;
  }

  .teacher-actions button,
  .teacher-actions .button {
    min-height: 44px;
    width: 100%;
  }
}

@media (max-width: 480px) {
  .teacher-info {
    padding: var(--space-4);
    gap: var(--space-2);
  }

  .teacher-name {
    font-size: var(--text-base);
  }

  .teacher-desc {
    font-size: var(--text-xs);
  }
}

/* =============================================================================== */
/* 5. 推荐课程轮播移动端适配 */
/* =============================================================================== */

@media (max-width: 768px) {
  .courses-carousel-slides-wrapper {
    min-height: 450px;
  }

  .courses-carousel-slide {
    left: 0;
    width: 100%;
  }

  .course-slide-card {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
  }

  .course-slide-image {
    padding: var(--space-4);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  }

  .course-slide-details {
    padding: var(--space-5);
    gap: var(--space-4);
  }

  .course-slide-title {
    font-size: var(--text-xl);
    margin: 0 0 var(--space-3) 0;
  }

  .course-slide-description {
    font-size: var(--text-base);
    margin-bottom: var(--space-4);
    line-height: var(--line-height-relaxed);
  }

  .carousel-dots {
    gap: var(--space-3);
    padding: var(--space-2) 0;
  }

  .dot {
    width: var(--space-3);
    height: var(--space-3);
    min-width: 44px;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .dot.active {
    width: var(--space-6);
  }

  .carousel-nav-prev {
    left: var(--space-2);
  }

  .carousel-nav-next {
    right: var(--space-2);
  }
}

@media (max-width: 480px) {
  .courses-carousel-slides-wrapper {
    min-height: 380px;
  }

  .course-slide-details {
    padding: var(--space-4);
  }

  .course-slide-title {
    font-size: var(--text-lg);
  }

  .course-slide-description {
    font-size: var(--text-sm);
  }
}

/* =============================================================================== */
/* 6. 学习流程区块移动端适配 */
/* =============================================================================== */

@media (max-width: 768px) {
  .learning-process-list {
    flex-direction: column;
    gap: var(--space-6);
    padding: var(--space-6) var(--space-3);
  }

  .process-step {
    flex: 1 1 100%;
    min-width: 100%;
    max-width: 100%;
    width: 100%;
  }

  .process-step-content {
    padding: var(--space-5);
  }

  .step-connector {
    right: auto;
    bottom: -24px;
    top: auto;
    left: 50%;
    transform: translateX(-50%) rotate(90deg);
    padding: var(--space-2) 0;
    width: var(--space-8);
    height: var(--space-8);
  }

  .step-connector i {
    animation: pulse-vertical 2s ease-in-out infinite;
  }

  @keyframes pulse-vertical {
    0%, 100% {
      opacity: 1;
      transform: translateY(0);
    }
    50% {
      opacity: 0.6;
      transform: translateY(4px);
    }
  }

  .step-number {
    width: var(--space-7);
    height: var(--space-7);
    font-size: var(--text-xs);
    top: -10px;
  }

  .step-icon-wrapper {
    width: var(--space-14);
    height: var(--space-14);
    margin-top: var(--space-3);
    margin-bottom: var(--space-3);
  }

  .step-icon-wrapper i {
    font-size: var(--text-xl);
  }

  .step-title {
    font-size: var(--text-lg);
  }

  .step-description {
    font-size: var(--text-sm);
  }

  .step-actions a {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .learning-process-list {
    padding: var(--space-4) var(--space-2);
    gap: var(--space-5);
  }

  .process-step-content {
    padding: var(--space-4);
  }

  .step-icon-wrapper {
    width: var(--space-12);
    height: var(--space-12);
  }

  .step-title {
    font-size: var(--text-base);
  }

  .step-description {
    font-size: var(--text-xs);
  }
}

/* =============================================================================== */
/* 7. 平台优势区块移动端适配 */
/* =============================================================================== */

@media (max-width: 768px) {
  .advantages-info {
    margin: var(--space-5);
  }

  .advantages-info h4 {
    font-size: var(--text-lg);
    margin-bottom: var(--space-3);
  }

  .advantages-info p {
    font-size: var(--text-base);
  }

  .advantages-info-description {
    font-size: var(--text-sm);
  }

  .advantages-image {
    margin: var(--space-5);
  }

  .slot-content {
    min-height: 350px;
  }

  .slot-content-item .advantages-image {
    width: 100%;
    margin: var(--space-5) 0;
  }

  .slot-nav-item {
    width: var(--space-70);
    margin: 0 var(--space-2);
    padding: var(--space-4);
  }
}

@media (max-width: 640px) {
  .slot-nav-item {
    width: var(--space-60);
    padding: var(--space-3);
  }
}

@media (max-width: 480px) {
  .advantages-info {
    margin: var(--space-4);
  }

  .advantages-info h4 {
    font-size: var(--text-base);
  }

  .advantages-info-description {
    font-size: var(--text-xs);
  }

  .advantages-image {
    margin: var(--space-4);
  }

  .slot-content {
    min-height: var(--space-80);
  }

  .slot-content-item .advantages-image {
    margin: var(--space-4) 0;
  }

  .slot-nav-item {
    width: var(--space-50);
  }
}

/* =============================================================================== */
/* 8. 学员反馈区块移动端适配 */
/* =============================================================================== */

/* 8.1 学员反馈转轮移动端回退处理 */
@media (max-width: 767px) {
  .testimonial-carousel-wrapper {
    height: auto;
    overflow: visible;
    margin: var(--space-4) 0;
  }

  .testimonial-carousel-container {
    position: static;
  }

  .testimonial-carousel-track {
    position: static;
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-6);
    flex-direction: column;
  }

  .testimonial-carousel-item {
    position: static;
    width: 100%;
    height: auto;
    margin: 0;
    opacity: 1 !important;
    transform: none !important;
  }

  .testimonial-carousel-item .testimonial-item {
    transform: none !important;
    opacity: 1 !important;
  }
}

/* 8.2 学员反馈普通列表移动端优化 */
@media (max-width: 768px) {
  .testimonial-list {
    padding: 0 var(--space-4);
  }

  .testimonial-item {
    margin-bottom: var(--space-5);
  }

  .testimonial .card-body {
    padding: var(--space-5);
  }

  .testimonial .card-body .w-80 {
    flex-direction: column;
    align-items: center;
    gap: var(--space-4);
    width: 100%;
  }

  .testimonial-avatar-wrapper {
    width: 100%;
    display: flex;
    justify-content: center;
  }

  .testimonial-avatar {
    width: var(--space-24);
    height: var(--space-24);
  }

  .testimonial-content-wrapper {
    width: 100%;
    text-align: center;
  }

  .testimonial-content {
    font-size: var(--text-base);
    padding: var(--space-3);
    margin-top: 0;
  }

  .testimonial-content::before {
    font-size: var(--text-3xl);
    top: -0.4rem;
    left: 0;
  }

  .testimonial-content::after {
    font-size: var(--text-3xl);
    bottom: -1.2rem;
    right: 0;
  }

  .testimonial-author {
    font-size: var(--text-sm);
    text-align: center;
    margin-top: var(--space-3);
  }
}

@media (max-width: 480px) {
  .testimonial-list {
    padding: 0 var(--space-3);
  }

  .testimonial-item {
    margin-bottom: var(--space-4);
  }

  .testimonial .card-body {
    padding: var(--space-4);
  }

  .testimonial-avatar {
    width: var(--space-20);
    height: var(--space-20);
  }

  .testimonial-content {
    font-size: var(--text-sm);
    padding: var(--space-2);
  }

  .testimonial-content::before {
    font-size: var(--text-2xl);
    top: -0.3rem;
  }

  .testimonial-content::after {
    font-size: var(--text-2xl);
    bottom: -1rem;
  }

  .testimonial-author {
    font-size: var(--text-xs);
  }
}

/* =============================================================================== */
/* 9. 常见问题区块移动端适配 */
/* =============================================================================== */

@media (max-width: 768px) {
  .faq-list {
    padding: 0 var(--space-3);
  }

  .faq-question {
    padding: var(--space-4) var(--space-4);
    font-size: var(--text-base);
    min-height: 44px;
  }

  .faq-answer {
    padding: 0 var(--space-4);
  }

  .faq-item.active .faq-answer {
    padding: 0 var(--space-4) var(--space-4) var(--space-4);
  }

  .faq-answer-content {
    font-size: var(--text-sm);
  }
}

@media (max-width: 480px) {
  .faq-list {
    padding: 0 var(--space-2);
  }

  .faq-question {
    padding: var(--space-3) var(--space-3);
    font-size: var(--text-sm);
  }

  .faq-answer {
    padding: 0 var(--space-3);
  }

  .faq-item.active .faq-answer {
    padding: 0 var(--space-3) var(--space-3) var(--space-3);
  }

  .faq-answer-content {
    font-size: var(--text-xs);
  }
}

/* =============================================================================== */
/* 10. 合作伙伴区块移动端适配 */
/* =============================================================================== */

@media (max-width: 768px) {
  .partners-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (max-width: 480px) {
  .partners-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* =============================================================================== */
/* 11. 通用移动端优化 */
/* =============================================================================== */

@media (max-width: 768px) {
  .link-arrow {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
}