<template>
  <div class="courses-page">
    <!-- 页面头部横幅 -->
    <div class="page-header">
      <div class="header-content">
        <h1 class="page-title">粉丝</h1>
        <p class="page-subtitle">7832</p>
      </div>
      <div class="header-content">
        <h1 class="page-title">课程</h1>
        <p class="page-subtitle">12</p>
      </div>
      <div class="header-content">
        <h1 class="page-title">播放量</h1>
        <p class="page-subtitle">12.3万</p>
      </div>
    </div>

    <div class="title-lecturer">
      <img src="/images/Teachers/师资力量1.png" alt="">
      <h3>汪波</h3>
      <p>云南师范大学教授、平台签约讲师</p>
      <button :class="{ 'disabled': isFollowing }" @click="toggleFollow">
  {{ isFollowing ? '已关注' : '+ 关注' }}
</button>
    </div>

    <!-- 主要内容区域 -->
    <div class="main-content">
      <div class="container">


        <!-- 课程导航 -->
        <div class="text-wrapper_8 flex-row">
          <span class="text_24">全部课程</span>
          <div class="sort-options">
            <span class="text_25" :class="{ 'active': sortType === 'hot' }" @click="selectSortType('hot')">最热</span>
            <span class="text_26" :class="{ 'active': sortType === 'new' }" @click="selectSortType('new')">最新</span>
          </div>
        </div>

        <!-- 加载状态 -->
        <div class="loading-state" v-if="loading">
          <div class="loading-content">
            <p>正在加载课程...</p>
          </div>
        </div>

        <!-- 课程网格 -->
        <div class="courses-grid" v-else-if="allCourses.length > 0">
          <div class="course-card" v-for="course in allCourses" :key="course.id">
            <div class="course-image">
              <img :src="course.thumbnail" :alt="course.title" />
            </div>
            <div class="course-info">
              <h3 class="course-title">{{ getCourseTitle(course) }}</h3>
              <div class="course-meta">
                <div class="course-chapters">
                  <img src="/images/Teachers/chapter.png" alt="课程章节" class="meta-icon">
                  <span>共9章54节</span>
                </div>
                <div class="course-duration">
                  <img src="/images/Teachers/duration.png" alt="课程时长" class="meta-icon">
                  <span>12小时43分钟</span>
                </div>
              </div>
              <div class="course-footer">
                <div class="course-stats">
                  <span class="course-students">讲师: 刘莹</span>
                </div>
                <button class="enroll-btn" @click="goToCourseDetail(course)">去学习</button>
              </div>
            </div>
          </div>
        </div>

        <!-- 空状态 -->
        <div class="empty-state" v-else>
          <div class="empty-content">
            <p>暂无符合条件的课程</p>
            <button class="clear-filters-btn" @click="clearAllFilters">清除筛选条件</button>
          </div>
        </div>

        <!-- 分页组件 -->
        <div class="pagination">
          <span class="pagination-info">{{ currentPageText }} / 共{{ totalPages }}页 ({{ totalItems }}条数据)</span>
          <span class="pagination-link prev" @click="goToPrevPage" :class="{ disabled: currentPage === 1 }">上一页</span>

          <!-- 第一页 -->
          <button v-if="totalPages > 0" class="pagination-btn page-num" :class="{ active: currentPage === 1 }"
            @click="goToPage(1)">1</button>

          <!-- 左侧省略号 -->
          <span v-if="currentPage > 4" class="pagination-dots">...</span>

          <!-- 当前页附近的页码 -->
          <template v-for="page in visiblePages" :key="page">
            <button v-if="page !== 1 && page !== totalPages" class="pagination-btn page-num"
              :class="{ active: currentPage === page }" @click="goToPage(page)">{{ page }}</button>
          </template>

          <!-- 右侧省略号 -->
          <span v-if="currentPage < totalPages - 3" class="pagination-dots">...</span>

          <!-- 最后一页 -->
          <button v-if="totalPages > 1" class="pagination-btn page-num" :class="{ active: currentPage === totalPages }"
            @click="goToPage(totalPages)">{{ totalPages }}</button>

          <span class="pagination-link next" @click="goToNextPage"
            :class="{ disabled: currentPage === totalPages }">下一页</span>
          <span class="pagination-link last" @click="goToPage(totalPages)">尾页</span>
        </div>
      </div>
    </div>
  </div>
</template>

<script setup lang="ts">
import { ref, computed, onMounted } from 'vue'

// 关注状态
const isFollowing = ref(false)

// 切换关注状态
const toggleFollow = () => {
  isFollowing.value = !isFollowing.value
}
import { useRouter } from 'vue-router'
import type { Course } from '@/api/types'
// import { mockCourses } from '@/data/mockCourses'

const router = useRouter()

// 课程数据和加载状态
const courses = ref<Course[]>([])
const loading = ref(false)
const total = ref(0)

// 筛选和排序状态
const selectedSubject = ref('全部')
const selectedMajor = ref('全部')
const selectedDifficulty = ref('全部')
const sortType = ref('all') // all: 全部课程, hot: 最热, new: 最新

// 分页相关状态
const currentPage = ref(1)
const itemsPerPage = 20
const totalItems = computed(() => total.value)
const totalPages = computed(() => Math.ceil(totalItems.value / itemsPerPage))

// 已移除未使用的广告显隐逻辑，避免构建时报未使用错误

// 数字转中文
const numberToChinese = (num: number): string => {
  const chineseNumbers = ['', '一', '二', '三', '四', '五', '六', '七', '八', '九', '十']
  if (num <= 10) {
    return chineseNumbers[num]
  } else if (num < 20) {
    return '十' + chineseNumbers[num - 10]
  } else if (num < 100) {
    const tens = Math.floor(num / 10)
    const ones = num % 10
    return chineseNumbers[tens] + '十' + (ones > 0 ? chineseNumbers[ones] : '')
  }
  return num.toString()
}

// 当前页面文本
const currentPageText = computed(() => {
  if (currentPage.value === 1) {
    return '首页'
  } else {
    return `第${numberToChinese(currentPage.value)}页`
  }
})

// 可见的页码范围
const visiblePages = computed(() => {
  const pages = []
  const current = currentPage.value
  const total = totalPages.value

  // 显示当前页前后2页
  const start = Math.max(2, current - 2)
  const end = Math.min(total - 1, current + 2)

  for (let i = start; i <= end; i++) {
    pages.push(i)
  }

  return pages
})

// 加载课程数据（使用模拟数据）
const loadCourses = async () => {
  try {
    loading.value = true

    // 模拟网络延迟
    await new Promise(resolve => setTimeout(resolve, 500))

    // 筛选逻辑
    let filteredCourses: Course[] = [
      {
        id: '1',
        title: '教育心理学基础课程',
        description: '本课程深入讲解教育心理学的基本理论和实践应用，帮助学生理解学习过程中的心理机制。',
        thumbnail: '/images/courses/course1.png',
        price: 0,
        currency: 'CNY',
        rating: 4.8,
        ratingCount: 125,
        studentsCount: 1250,
        duration: '12小时43分钟',
        totalLessons: 54,
        level: 'beginner',
        language: 'zh-CN',
        category: { id: 1, name: '教育培训', slug: 'education-training' },
        tags: ['心理学', '教育', '基础'],
        skills: ['心理分析', '教育理论'],
        requirements: ['无特殊要求'],
        objectives: ['掌握教育心理学基础理论'],
        instructor: {
          id: 1,
          name: '汪波',
          avatar: '/images/Teachers/师资力量1.png',
          title: '云南师范大学教授',
          bio: '资深教育心理学专家',
          rating: 4.8,
          studentsCount: 1250,
          coursesCount: 6,
          experience: '15年',
          education: ['云南师范大学', '教育心理学博士'],
          certifications: ['高级心理咨询师', '教育技术专家']
        },
        status: 'published',
        createdAt: '2024-01-15T10:00:00Z',
        updatedAt: '2024-01-15T10:00:00Z'
      },
      {
        id: '2',
        title: '现代教育技术应用',
        description: '探索现代教育技术在课堂教学中的应用，包括多媒体教学、在线教育平台等。',
        thumbnail: '/images/courses/course2.png',
        price: 0,
        currency: 'CNY',
        rating: 4.6,
        ratingCount: 89,
        studentsCount: 890,
        duration: '10小时20分钟',
        totalLessons: 42,
        level: 'intermediate',
        language: 'zh-CN',
        category: { id: 2, name: '技术应用', slug: 'tech-application' },
        tags: ['教育技术', '多媒体', '在线教育'],
        skills: ['多媒体制作', '在线教学'],
        requirements: ['基础计算机操作'],
        objectives: ['掌握现代教育技术应用'],
        instructor: {
          id: 1,
          name: '汪波',
          avatar: '/images/Teachers/师资力量1.png',
          title: '云南师范大学教授',
          bio: '资深教育技术专家',
          rating: 4.6,
          studentsCount: 890,
          coursesCount: 6,
          experience: '15年',
          education: ['云南师范大学', '教育技术博士'],
          certifications: ['高级教育技术专家', '多媒体制作师']
        },
        status: 'published',
        createdAt: '2024-02-20T14:30:00Z',
        updatedAt: '2024-02-20T14:30:00Z'
      },
      {
        id: '3',
        title: '课程设计与开发',
        description: '学习如何设计和开发高质量的课程内容，包括教学目标制定、教学内容组织等。',
        thumbnail: '/images/courses/course3.png',
        price: 0,
        currency: 'CNY',
        rating: 4.7,
        ratingCount: 67,
        studentsCount: 567,
        duration: '15小时30分钟',
        totalLessons: 68,
        level: 'advanced',
        language: 'zh-CN',
        category: { id: 3, name: '课程设计', slug: 'course-design' },
        tags: ['课程设计', '教学开发', '教育'],
        skills: ['课程规划', '教学设计'],
        requirements: ['教育理论基础'],
        objectives: ['掌握课程设计方法'],
        instructor: {
          id: 1,
          name: '汪波',
          avatar: '/images/Teachers/师资力量1.png',
          title: '云南师范大学教授',
          bio: '课程设计专家',
          rating: 4.7,
          studentsCount: 567,
          coursesCount: 6,
          experience: '15年',
          education: ['云南师范大学', '课程设计博士'],
          certifications: ['高级课程设计师', '教育专家']
        },
        status: 'published',
        createdAt: '2024-03-10T09:15:00Z',
        updatedAt: '2024-03-10T09:15:00Z'
      },
      {
        id: '4',
        title: '教育研究方法论',
        description: '系统介绍教育研究的基本方法和技巧，培养学生进行教育研究的能力。',
        thumbnail: '/images/courses/course4.png',
        price: 0,
        currency: 'CNY',
        rating: 4.5,
        ratingCount: 43,
        studentsCount: 432,
        duration: '8小时15分钟',
        totalLessons: 36,
        level: 'intermediate',
        language: 'zh-CN',
        category: { id: 4, name: '研究方法', slug: 'research-methods' },
        tags: ['研究方法', '教育', '学术'],
        skills: ['研究设计', '数据分析'],
        requirements: ['统计学基础'],
        objectives: ['掌握教育研究方法'],
        instructor: {
          id: 1,
          name: '汪波',
          avatar: '/images/Teachers/师资力量1.png',
          title: '云南师范大学教授',
          bio: '教育研究专家',
          rating: 4.5,
          studentsCount: 432,
          coursesCount: 6,
          experience: '15年',
          education: ['云南师范大学', '教育研究博士'],
          certifications: ['高级教育研究专家', '学术顾问']
        },
        status: 'published',
        createdAt: '2024-01-25T16:45:00Z',
        updatedAt: '2024-01-25T16:45:00Z'
      },
      {
        id: '5',
        title: '学生心理辅导技巧',
        description: '学习如何对学生进行心理辅导，掌握基本的心理咨询和辅导技巧。',
        thumbnail: '/images/courses/course5.png',
        price: 0,
        currency: 'CNY',
        rating: 4.9,
        ratingCount: 78,
        studentsCount: 678,
        duration: '6小时45分钟',
        totalLessons: 28,
        level: 'beginner',
        language: 'zh-CN',
        category: { id: 5, name: '心理辅导', slug: 'psychological-counseling' },
        tags: ['心理辅导', '学生', '技巧'],
        skills: ['心理咨询', '沟通技巧'],
        requirements: ['心理学基础'],
        objectives: ['掌握心理辅导技巧'],
        instructor: {
          id: 1,
          name: '汪波',
          avatar: '/images/Teachers/师资力量1.png',
          title: '云南师范大学教授',
          bio: '心理咨询专家',
          rating: 4.9,
          studentsCount: 678,
          coursesCount: 6,
          experience: '15年',
          education: ['云南师范大学', '心理学博士'],
          certifications: ['高级心理咨询师', '心理治疗师']
        },
        status: 'published',
        createdAt: '2024-02-05T11:20:00Z',
        updatedAt: '2024-02-05T11:20:00Z'
      },
      {
        id: '6',
        title: '教育评估与测量',
        description: '学习教育评估的基本理论和方法，掌握教育测量的技术和工具。',
        thumbnail: '/images/courses/course5.png',
        price: 0,
        currency: 'CNY',
        rating: 4.4,
        ratingCount: 34,
        studentsCount: 345,
        duration: '9小时20分钟',
        totalLessons: 40,
        level: 'advanced',
        language: 'zh-CN',
        category: { id: 6, name: '教育评估', slug: 'education-assessment' },
        tags: ['教育评估', '测量', '技术'],
        skills: ['评估设计', '测量技术'],
        requirements: ['教育统计学'],
        objectives: ['掌握教育评估方法'],
        instructor: {
          id: 1,
          name: '汪波',
          avatar: '/images/Teachers/师资力量1.png',
          title: '云南师范大学教授',
          bio: '教育评估专家',
          rating: 4.4,
          studentsCount: 345,
          coursesCount: 6,
          experience: '15年',
          education: ['云南师范大学', '教育评估博士'],
          certifications: ['高级教育评估师', '测量技术专家']
        },
        status: 'published',
        createdAt: '2024-03-15T13:10:00Z',
        updatedAt: '2024-03-15T13:10:00Z'
      }
    ] // 使用模拟数据，后续可以从API获取

    // 按学科筛选
    if (selectedSubject.value !== '全部') {
      filteredCourses = filteredCourses.filter(course => {
        switch (selectedSubject.value) {
          case '计算机':
            return course.category.name === '编程开发' || course.category.name === '前端开发' || course.category.name === '后端开发'
          case '教育学':
            return course.category.name === '教育培训'
          default:
            return true
        }
      })
    }

    // 排序逻辑
    if (sortType.value === 'hot') {
      // 按热度排序（假设课程有studentsCount字段表示学生数量）
      filteredCourses.sort((a, b) => {
        const studentsA = a.studentsCount || 0;
        const studentsB = b.studentsCount || 0;
        return studentsB - studentsA;
      });
    } else if (sortType.value === 'new') {
      // 按最新排序（假设课程有createdAt字段表示创建时间）
      filteredCourses.sort((a, b) => {
        const dateA = new Date(a.createdAt || 0);
        const dateB = new Date(b.createdAt || 0);
        return dateB.getTime() - dateA.getTime();
      });
    } else {
      // 默认排序（按课程ID）
      filteredCourses.sort((a, b) => a.id.localeCompare(b.id));
    }

    // 按专业筛选
    if (selectedMajor.value !== '全部') {
      filteredCourses = filteredCourses.filter(course =>
        course.title.includes(selectedMajor.value) ||
        course.description.includes(selectedMajor.value) ||
        course.tags?.some((tag: string) => tag.includes(selectedMajor.value))
      )
    }

    // 按难度筛选
    if (selectedDifficulty.value !== '全部') {
      const difficultyMap: { [key: string]: string } = {
        '初级': 'beginner',
        '中级': 'intermediate',
        '高级': 'advanced'
      }
      const targetLevel = difficultyMap[selectedDifficulty.value]
      if (targetLevel) {
        filteredCourses = filteredCourses.filter(course => course.level === targetLevel)
      }
    }

    // 分页处理
    total.value = filteredCourses.length
    const startIndex = (currentPage.value - 1) * itemsPerPage
    const endIndex = startIndex + itemsPerPage
    courses.value = filteredCourses.slice(startIndex, endIndex)

    console.log('课程加载成功:', courses.value.length, '条课程，总计:', total.value)
  } catch (error) {
    console.error('加载课程失败:', error)
    courses.value = []
    total.value = 0
  } finally {
    loading.value = false
  }
}

// 根据学科获取分类ID（这里需要根据实际后端分类来映射）
// const getCategoryIdBySubject = (subject: string): number | undefined => {
//   const categoryMap: Record<string, number> = {
//     '必修课': 1,
//     '高分课': 2,
//     '名师课堂': 3,
//     '训练营': 4,
//     '无考试': 5,
//     '专题讲座': 6
//   }
//   return categoryMap[subject]
// }

// 跳转到指定页面
const goToPage = (page: number) => {
  if (page >= 1 && page <= totalPages.value) {
    currentPage.value = page
    loadCourses()
  }
}

// 上一页
const goToPrevPage = () => {
  if (currentPage.value > 1) {
    goToPage(currentPage.value - 1)
  }
}

// 下一页
const goToNextPage = () => {
  if (currentPage.value < totalPages.value) {
    goToPage(currentPage.value + 1)
  }
}

// 清除所有筛选条件
const clearAllFilters = () => {
  selectedSubject.value = '全部'
  selectedMajor.value = '全部'
  selectedDifficulty.value = '全部'
  currentPage.value = 1
  loadCourses()
}

// 已移除未使用的筛选函数，避免构建时报未使用错误

// 排序功能
const selectSortType = (type: string) => {
  sortType.value = type
  currentPage.value = 1 // 重置到第一页
  loadCourses()
}

// 当前页显示的课程数据（直接使用从API获取的数据）
const allCourses = computed(() => {
  return courses.value
})

// 获取课程标题的函数
const getCourseTitle = (course: Course) => {
  return course.title
}

// 跳转到课程详情页
const goToCourseDetail = (course: Course) => {
  router.push({
    name: 'CourseDetail',
    params: { id: course.id }
  })
}

// 组件挂载时加载数据
onMounted(() => {
  loadCourses()
})
</script>

<style scoped>
.courses-page {
  min-height: 100vh;
  background: #fff;
}

.page-header {
  background-image: url('/images/Teachers/teacher-bg.png');
  background-size: cover;
  background-position: center;
  text-align: center;
  color: #000;
  position: relative;
  overflow: hidden;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  padding-right: 320px;
  height: 165px;
}

.page-header::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 300px;
  height: 100%;
  background: url('/images/header-decoration.png') no-repeat center right;
  background-size: contain;
  opacity: 0.3;
}

.header-content {
  height: 40px;
  padding: 0 20px;
  position: relative;
  z-index: 1;
  border-right: 1px solid #D8D8D8;
}

/* 最后一个 */
.header-content:last-child {
  border-right: none;
}

.page-title {
  font-size: 16px;
  margin: -10px 0 5px 0;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.page-subtitle {
  font-size: 24px;
  opacity: 0.9;
  margin-bottom: 35px;
  font-weight: 700;
}

.main-content {
  padding: 40px 0;
}

.container {
  max-width: 1420px;
  margin: 0 auto;
  padding: 0 0;
  box-sizing: border-box;
}

.text-wrapper_8 {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.flex-row {
  flex-direction: row;
}

.sort-options {
  display: flex;
  justify-content: flex-end;
}

.text_24 {
  font-size: 24px;
  color: #333;
  margin-right: 0;
}

.text_25, 
.text_26 {
  margin-left: 30px;
  cursor: pointer;
  font-size: 14px;
  padding-bottom: 5px;
  position: relative;
  color: #666;
}

.text_25.active, 
.text_26.active {
  color: #1890ff;
  font-weight: 500;
}

.text_25.active::after, 
.text_26.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: #1890ff;
}

.text_25,
.text_26 {
  color: #666;
}

.text_25:hover,
.text_26:hover {
  color: #1890ff;
}

.sort-tab.active {
  color: #1890ff;
  border-bottom-color: #1890ff;
  font-weight: 500;
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
  margin-bottom: 40px;
  width: 100%;
  box-sizing: border-box;
}

.course-card {
  background: white;
  border-radius: 2px;
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
  cursor: pointer;
  /* min-height: 350px; */
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.course-image {
  width: 100%;
  height: 200px;
  overflow: hidden;
  border-radius: 5px 5px 0 0;
}

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

.course-info {
  padding: 16px;
}



.course-title {
  font-size: 16px;
  font-weight: 500;
  color: #333;
  margin: 0 0 12px 0;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.course-meta {
  display: flex;
  justify-content: left;
  gap: 10px;
  font-size: 12px;
  color: #999;
  margin-bottom: 16px;
}

.course-duration {
  color: #666;
}

.course-price {
  color: #ff4d4f;
  font-weight: 500;
}

.course-stats {
  display: flex;
  align-items: center;
}

.course-students {
  color: #999;
  font-size: 14px;
}

.course-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.course-chapters,
.course-duration {
  display: flex;
  align-items: center;
  font-size: 14px;
  color: #666;
}

.meta-icon {
  width: 16px;
  height: 16px;
  margin-right: 4px;
  vertical-align: middle;
}

.course-teacher {
  font-size: 12px;
  color: #999;
  margin-bottom: 12px;
}

.course-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.course-tag {
  background: transparent;
  color: #999;
  padding: 0;
  border-radius: 0;
  font-size: 12px;
  white-space: nowrap;
}

.enroll-btn {
  background: #0286D5;
  color: white;
  border: none;
  padding: 6px 10px;
  border-radius: 20px;
  cursor: pointer;
  font-size: 12px;
  transition: background 0.2s;
  white-space: nowrap;
}

.enroll-btn:hover {
  background: #40a9ff;
}

.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px 0;
  margin-top: 40px;
}

.pagination-info {
  color: #666;
  font-size: 14px;
  margin-right: 20px;
}

.pagination-btn {
  padding: 8px 12px;
  border: 1px solid #d9d9d9;
  background: white;
  color: #666;
  border-radius: 4px;
  cursor: pointer;
  font-size: 14px;
  transition: all 0.2s;
  min-width: 40px;
  text-align: center;
  margin: 0 6px;
}

.pagination-btn:hover {
  border-color: #1890ff;
  color: #1890ff;
}

.pagination-btn.active {
  background: #1890ff;
  border-color: #1890ff;
  color: white;
}

/* 移除了 .pagination-btn.last 样式，因为现在尾页是文本链接 */

.pagination-btn:disabled {
  background: #f5f5f5;
  color: #ccc;
  border-color: #e6e6e6;
  cursor: not-allowed;
}

.pagination-btn:disabled:hover {
  background: #f5f5f5;
  color: #ccc;
  border-color: #e6e6e6;
}

.pagination-link {
  color: #666;
  font-size: 14px;
  cursor: pointer;
  padding: 8px 12px;
  margin: 0 6px;
  transition: color 0.2s;
  user-select: none;
}

.pagination-link:hover {
  color: #1890ff;
}

.pagination-link.disabled {
  color: #ccc;
  cursor: not-allowed;
}

.pagination-link.disabled:hover {
  color: #ccc;
}

.pagination-dots {
  color: #999;
  padding: 0 8px;
  font-size: 14px;
  margin: 0 6px;
}

.stats-grid {
  display: flex;
  align-items: center;
  width: 100%;
  margin: 0 auto;
  padding: 0 247px;
}

.stat-item {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 0 45px 0 25px;
}

.stat-item:last-child {
  border-right: none;
}

.stat-item:last-child {
  border-right: none;
}

.line {
  width: 1px;
  height: 50px;
  background: #D0E8F5;
}

.stat-icon {
  flex-shrink: 0;
  width: 74px;
  height: 74px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.stat-icon img {
  width: 74px;
  height: 74px;
  object-fit: contain;
  display: block;
}

.title-lecturer {
  position: relative;
  text-align: center;
}

.title-lecturer img {
  position: absolute;
  left: 50%;
  top: -32%;
  transform: translateX(-50%);
  width: 128px;
  height: 128px;
  border-radius: 50%;
}

.title-lecturer h3 {
  padding-top: 80px;
  font-size: 24px;
  font-weight: 600;
}

.title-lecturer p {
  font-size: 14px;
  color: #999;
  margin-bottom: 20px;
}

.title-lecturer button {
  width: 96px;
  height: 40px;
  background: #0088D1;
  border: none;
  border-radius: 5px;
  font-size: 16px;
  color: white;
}

.title-lecturer .disabled {
  border: 1px solid #0088D1;
  background-color: #E2F5FF;
  color: #0088D1;
}

@media (max-width: 768px) {
  .container {
    margin: 0 20px;
  }
}

@media (max-width: 480px) {
  .courses-grid {
    grid-template-columns: 1fr;
  }

  .container {
    margin: 0 16px;
  }

  .filter-section {
    padding: 16px;
  }
}
</style>
