/* CloudSkillAcademy2026Z9 - 垫齿科技在线教育平台样式表 */
/* 创建日期: 2026年 */

:root {
  --primary-color: #667eea;
  --secondary-color: #764ba2;
  --accent-color: #f093fb;
  --dark-bg: #1a1c2e;
  --light-bg: #f8f9fc;
  --text-dark: #2d3748;
  --text-light: #718096;
  --success-color: #48bb78;
  --warning-color: #ed8936;
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-accent: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --shadow-sm: 0 2px 8px rgba(102, 126, 234, 0.15);
  --shadow-md: 0 8px 24px rgba(102, 126, 234, 0.2);
  --shadow-lg: 0 16px 48px rgba(102, 126, 234, 0.25);
  --border-radius: 16px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--light-bg);
  color: var(--text-dark);
  line-height: 1.7;
  min-height: 100vh;
}

/* 容器 */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 头部导航 */
.header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  box-shadow: var(--shadow-sm);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.logo-icon {
  width: 44px;
  height: 44px;
  background: var(--gradient-primary);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: bold;
  font-size: 20px;
}

.logo-text {
  font-size: 22px;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 8px;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-dark);
  padding: 10px 20px;
  border-radius: 10px;
  font-weight: 500;
  transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  background: var(--gradient-primary);
  color: white;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 28px;
  cursor: pointer;
  color: var(--text-dark);
}

/* 主横幅 */
.hero {
  padding: 140px 0 80px;
  background: var(--gradient-primary);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
  border-radius: 50%;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-text {
  color: white;
}

.hero-badge {
  display: inline-block;
  background: rgba(255, 255, 255, 0.2);
  padding: 8px 20px;
  border-radius: 50px;
  font-size: 14px;
  margin-bottom: 24px;
  backdrop-filter: blur(10px);
}

.hero-title {
  font-size: 48px;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 24px;
}

.hero-desc {
  font-size: 18px;
  opacity: 0.9;
  margin-bottom: 36px;
  line-height: 1.8;
}

.hero-btns {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: white;
  color: var(--primary-color);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.btn-outline {
  background: transparent;
  color: white;
  border: 2px solid rgba(255, 255, 255, 0.5);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: white;
}

.btn-gradient {
  background: var(--gradient-primary);
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-gradient:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.hero-image {
  position: relative;
}

.hero-image img {
  width: 100%;
  border-radius: 24px;
  box-shadow: var(--shadow-lg);
}

/* 统计数据 */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: -40px;
  position: relative;
  z-index: 10;
}

.stat-card {
  background: white;
  padding: 32px;
  border-radius: var(--border-radius);
  text-align: center;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.stat-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.stat-number {
  font-size: 42px;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  color: var(--text-light);
  font-size: 15px;
  margin-top: 8px;
}

/* 课程区域 */
.section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-tag {
  display: inline-block;
  background: rgba(102, 126, 234, 0.1);
  color: var(--primary-color);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 16px;
}

.section-title {
  font-size: 38px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-dark);
}

.section-desc {
  font-size: 18px;
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto;
}

/* 课程卡片 */
.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 32px;
}

.course-card {
  background: white;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  display: block;
}

.course-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.course-image {
  position: relative;
  height: 200px;
  overflow: hidden;
}

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

.course-card:hover .course-image img {
  transform: scale(1.08);
}

.course-badge {
  position: absolute;
  top: 16px;
  left: 16px;
  background: var(--gradient-accent);
  color: white;
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 600;
}

.course-content {
  padding: 24px;
}

.course-category {
  font-size: 13px;
  color: var(--primary-color);
  font-weight: 600;
  margin-bottom: 8px;
}

.course-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.4;
}

.course-desc {
  font-size: 14px;
  color: var(--text-light);
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.course-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 16px;
  border-top: 1px solid #edf2f7;
}

.course-info {
  display: flex;
  gap: 16px;
  font-size: 13px;
  color: var(--text-light);
}

.course-info span {
  display: flex;
  align-items: center;
  gap: 4px;
}

.course-price {
  font-size: 22px;
  font-weight: 700;
  color: var(--secondary-color);
}

.course-price-original {
  font-size: 14px;
  color: var(--text-light);
  text-decoration: line-through;
  margin-left: 8px;
}

/* 特色区域 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
}

.feature-card {
  background: white;
  padding: 40px 32px;
  border-radius: var(--border-radius);
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.feature-icon {
  width: 72px;
  height: 72px;
  background: var(--gradient-primary);
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
  font-size: 32px;
}

.feature-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}

.feature-desc {
  font-size: 15px;
  color: var(--text-light);
  line-height: 1.7;
}

/* 评价区域 */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 32px;
}

.review-card {
  background: white;
  padding: 32px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
}

.review-stars {
  color: #ffc107;
  font-size: 18px;
  margin-bottom: 16px;
}

.review-text {
  font-size: 15px;
  color: var(--text-dark);
  line-height: 1.8;
  margin-bottom: 20px;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 16px;
}

.review-avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  object-fit: cover;
}

.review-info h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
}

.review-info p {
  font-size: 13px;
  color: var(--text-light);
}

/* 页脚 */
.footer {
  background: var(--dark-bg);
  color: white;
  padding: 80px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 60px;
  margin-bottom: 60px;
}

.footer-brand {
  max-width: 320px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.footer-logo-icon {
  width: 48px;
  height: 48px;
  background: var(--gradient-primary);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: bold;
}

.footer-logo-text {
  font-size: 22px;
  font-weight: 700;
}

.footer-brand p {
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.8;
  margin-bottom: 20px;
}

.footer-contact {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
}

.footer-contact p {
  margin-bottom: 8px;
}

.footer-column h4 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 24px;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 14px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  font-size: 15px;
  transition: var(--transition);
}

.footer-links a:hover {
  color: white;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-copyright {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
}

.footer-icp a {
  color: rgba(255, 255, 255, 0.6);
  text-decoration: none;
  font-size: 14px;
  transition: var(--transition);
}

.footer-icp a:hover {
  color: white;
}

/* 返回顶部按钮 */
.back-to-top {
  position: fixed;
  bottom: 100px;
  right: 30px;
  width: 52px;
  height: 52px;
  background: var(--gradient-primary);
  border: none;
  border-radius: 50%;
  color: white;
  font-size: 22px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  box-shadow: var(--shadow-md);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

/* AI客服按钮 */
.ai-chat-btn {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 64px;
  height: 64px;
  background: var(--gradient-accent);
  border: none;
  border-radius: 50%;
  color: white;
  font-size: 28px;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  z-index: 999;
  transition: var(--transition);
  animation: pulse 2s infinite;
}

.ai-chat-btn:hover {
  transform: scale(1.1);
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(240, 147, 251, 0.4); }
  50% { box-shadow: 0 0 0 15px rgba(240, 147, 251, 0); }
}

.chat-box {
  position: fixed;
  bottom: 110px;
  right: 30px;
  width: 380px;
  background: white;
  border-radius: 20px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  z-index: 1000;
  display: none;
  animation: slideUp 0.3s ease;
}

.chat-box.active {
  display: block;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.chat-header {
  background: var(--gradient-primary);
  color: white;
  padding: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.chat-header h3 {
  font-size: 18px;
  font-weight: 600;
}

.chat-close {
  background: none;
  border: none;
  color: white;
  font-size: 24px;
  cursor: pointer;
}

.chat-messages {
  height: 300px;
  overflow-y: auto;
  padding: 20px;
  background: #f8f9fc;
}

.chat-message {
  margin-bottom: 16px;
}

.chat-message.bot {
  display: flex;
  gap: 12px;
}

.chat-avatar {
  width: 36px;
  height: 36px;
  background: var(--gradient-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
}

.chat-bubble {
  background: white;
  padding: 14px 18px;
  border-radius: 16px;
  border-top-left-radius: 4px;
  font-size: 14px;
  line-height: 1.6;
  box-shadow: var(--shadow-sm);
}

.chat-input-area {
  padding: 16px;
  border-top: 1px solid #edf2f7;
  display: flex;
  gap: 12px;
}

.chat-input {
  flex: 1;
  padding: 12px 16px;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  font-size: 14px;
  outline: none;
  transition: var(--transition);
}

.chat-input:focus {
  border-color: var(--primary-color);
}

.chat-send {
  width: 48px;
  height: 48px;
  background: var(--gradient-primary);
  border: none;
  border-radius: 10px;
  color: white;
  font-size: 18px;
  cursor: pointer;
  transition: var(--transition);
}

.chat-send:hover {
  transform: scale(1.05);
}

/* 订单页面 */
.order-page {
  padding: 120px 0 80px;
  min-height: 100vh;
}

.order-container {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: start;
}

.order-form-section {
  background: white;
  padding: 40px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-md);
}

.order-form-section h2 {
  font-size: 26px;
  margin-bottom: 32px;
  padding-bottom: 16px;
  border-bottom: 2px solid #edf2f7;
}

.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text-dark);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 14px 18px;
  border: 2px solid #e2e8f0;
  border-radius: 12px;
  font-size: 15px;
  transition: var(--transition);
  background: #f8f9fc;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  background: white;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.order-summary {
  background: white;
  padding: 40px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 100px;
}

.order-summary h3 {
  font-size: 22px;
  margin-bottom: 24px;
}

.order-item {
  display: flex;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid #edf2f7;
}

.order-item-image {
  width: 80px;
  height: 60px;
  border-radius: 8px;
  object-fit: cover;
}

.order-item-info h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
}

.order-item-info p {
  font-size: 13px;
  color: var(--text-light);
}

.order-totals {
  padding-top: 20px;
}

.order-total-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 12px;
  font-size: 15px;
}

.order-total-row.final {
  font-size: 20px;
  font-weight: 700;
  color: var(--secondary-color);
  padding-top: 16px;
  border-top: 2px solid #edf2f7;
  margin-top: 16px;
}

.order-submit-btn {
  width: 100%;
  padding: 18px;
  font-size: 18px;
  margin-top: 24px;
}

/* 课程详情页 */
.course-detail-page {
  padding: 100px 0 60px;
}

.course-detail-header {
  background: var(--gradient-primary);
  padding: 60px 0;
  margin-top: -100px;
  padding-top: 160px;
}

.course-detail-header .container {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 60px;
  align-items: center;
}

.course-detail-image {
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.course-detail-image img {
  width: 100%;
  display: block;
}

.course-detail-info {
  color: white;
}

.course-detail-category {
  display: inline-block;
  background: rgba(255, 255, 255, 0.2);
  padding: 8px 18px;
  border-radius: 30px;
  font-size: 14px;
  margin-bottom: 20px;
}

.course-detail-title {
  font-size: 38px;
  font-weight: 800;
  margin-bottom: 20px;
  line-height: 1.3;
}

.course-detail-desc {
  font-size: 17px;
  opacity: 0.9;
  line-height: 1.8;
  margin-bottom: 28px;
}

.course-detail-meta {
  display: flex;
  gap: 32px;
  margin-bottom: 32px;
}

.course-detail-meta span {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  opacity: 0.9;
}

.course-detail-price-box {
  display: flex;
  align-items: center;
  gap: 24px;
}

.course-detail-price {
  font-size: 38px;
  font-weight: 800;
}

.course-detail-price-original {
  font-size: 20px;
  opacity: 0.6;
  text-decoration: line-through;
}

.course-detail-content {
  padding: 60px 0;
}

.course-detail-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 48px;
}

.course-outline {
  background: white;
  padding: 36px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
}

.course-outline h3 {
  font-size: 24px;
  margin-bottom: 28px;
}

.outline-item {
  padding: 18px 0;
  border-bottom: 1px solid #edf2f7;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

.outline-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--gradient-primary);
  color: white;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  margin-right: 16px;
}

.outline-title {
  font-size: 16px;
  font-weight: 500;
}

.outline-duration {
  font-size: 14px;
  color: var(--text-light);
}

.course-sidebar {
  position: sticky;
  top: 100px;
}

.instructor-card {
  background: white;
  padding: 32px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  text-align: center;
  margin-bottom: 24px;
}

.instructor-avatar {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 20px;
}

.instructor-name {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}

.instructor-title {
  font-size: 14px;
  color: var(--text-light);
  margin-bottom: 16px;
}

.instructor-bio {
  font-size: 14px;
  color: var(--text-dark);
  line-height: 1.7;
}

.course-action-card {
  background: white;
  padding: 32px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
}

.course-action-card .price-box {
  text-align: center;
  margin-bottom: 24px;
}

.course-action-card .price {
  font-size: 36px;
  font-weight: 800;
  color: var(--secondary-color);
}

.course-action-card .price-original {
  font-size: 18px;
  color: var(--text-light);
  text-decoration: line-through;
  margin-left: 12px;
}

.course-action-card .btn {
  width: 100%;
  margin-bottom: 12px;
}

.course-benefits {
  list-style: none;
  margin-top: 24px;
}

.course-benefits li {
  padding: 10px 0;
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.course-benefits li::before {
  content: '✓';
  color: var(--success-color);
  font-weight: bold;
}

/* 详情页评价 */
.course-reviews {
  background: white;
  padding: 36px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  margin-top: 32px;
}

.course-reviews h3 {
  font-size: 24px;
  margin-bottom: 28px;
}

/* 关于页面 */
.about-page {
  padding: 100px 0 60px;
}

.about-header {
  background: var(--gradient-primary);
  padding: 80px 0;
  margin-top: -100px;
  padding-top: 180px;
  text-align: center;
  color: white;
}

.about-header h1 {
  font-size: 48px;
  font-weight: 800;
  margin-bottom: 20px;
}

.about-header p {
  font-size: 20px;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto;
}

.about-content {
  padding: 80px 0;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  margin-bottom: 80px;
}

.about-image {
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.about-image img {
  width: 100%;
  display: block;
}

.about-text h2 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 20px;
}

.about-text p {
  font-size: 16px;
  color: var(--text-light);
  line-height: 1.9;
  margin-bottom: 16px;
}

.team-section {
  text-align: center;
}

.team-section h2 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 48px;
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 32px;
}

.team-card {
  background: white;
  padding: 32px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.team-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.team-avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 20px;
}

.team-name {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}

.team-role {
  font-size: 14px;
  color: var(--primary-color);
  margin-bottom: 16px;
}

.team-bio {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.7;
}

/* 响应式 */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-image {
    order: -1;
    max-width: 500px;
    margin: 0 auto;
  }
  
  .stats {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .order-container {
    grid-template-columns: 1fr;
  }
  
  .course-detail-header .container {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .course-detail-meta {
    justify-content: center;
  }
  
  .course-detail-price-box {
    justify-content: center;
  }
  
  .course-detail-grid {
    grid-template-columns: 1fr;
  }
  
  .about-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: 20px;
    box-shadow: var(--shadow-md);
  }
  
  .nav-links.active {
    display: flex;
  }
  
  .mobile-menu-btn {
    display: block;
  }
  
  .hero-title {
    font-size: 32px;
  }
  
  .hero-btns {
    justify-content: center;
  }
  
  .stats {
    grid-template-columns: 1fr;
  }
  
  .section-title {
    font-size: 28px;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  
  .chat-box {
    right: 16px;
    left: 16px;
    width: auto;
  }
  
  .form-row {
    grid-template-columns: 1fr;
  }
  
  .course-detail-title {
    font-size: 28px;
  }
  
  .about-header h1 {
    font-size: 32px;
  }
  
  .reviews-grid {
    grid-template-columns: 1fr;
  }
}