/* pages/courses/courses.wxss */
.container {
  background: linear-gradient(180deg, #f8f9fa 0%, #ffffff 100%);
  min-height: 100vh;
  /* 底部留出TabBar的空间 */
  padding-bottom: calc(env(safe-area-inset-bottom) + 150rpx);
}

/* 搜索栏 */
.search-bar {
  display: flex;
  padding: 20rpx 30rpx;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  gap: 20rpx;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 4rpx 12rpx rgba(102, 126, 234, 0.15);
}

.search-input-wrap {
  flex: 1;
  position: relative;
  animation: slideInLeft 0.5s ease-out;
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-20rpx);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.search-input {
  width: 100%;
  height: 70rpx;
  background-color: rgba(255, 255, 255, 0.95);
  border-radius: 35rpx;
  padding: 0 50rpx 0 30rpx;
  font-size: 28rpx;
  box-shadow: 0 2rpx 8rpx rgba(0, 0, 0, 0.08);
  transition: all 0.3s ease;
}

.search-input:focus {
  background-color: #ffffff;
  box-shadow: 0 4rpx 16rpx rgba(0, 0, 0, 0.12);
}

.search-icon {
  position: absolute;
  right: 30rpx;
  top: 50%;
  transform: translateY(-50%);
  font-size: 32rpx;
  color: #999999;
  transition: color 0.3s ease;
}

.clear-icon {
  position: absolute;
  right: 30rpx;
  top: 50%;
  transform: translateY(-50%);
  font-size: 32rpx;
  color: #999999;
  width: 40rpx;
  height: 40rpx;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #E0E0E0 0%, #BDBDBD 100%);
  border-radius: 50%;
  font-size: 24rpx;
  box-shadow: 0 2rpx 6rpx rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

.clear-icon:active {
  transform: translateY(-50%) scale(0.9);
  box-shadow: 0 1rpx 3rpx rgba(0, 0, 0, 0.15);
}

.filter-btn {
  display: flex;
  align-items: center;
  gap: 10rpx;
  padding: 0 30rpx;
  background: rgba(255, 255, 255, 0.25);
  color: #ffffff;
  border-radius: 35rpx;
  font-size: 28rpx;
  backdrop-filter: blur(10rpx);
  box-shadow: 0 2rpx 8rpx rgba(0, 0, 0, 0.08);
  transition: all 0.3s ease;
  animation: slideInRight 0.5s ease-out;
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(20rpx);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.filter-btn:active {
  background: rgba(255, 255, 255, 0.35);
  transform: scale(0.95);
}

.filter-icon {
  font-size: 32rpx;
}

/* 分类标签 */
.category-scroll {
  white-space: nowrap;
  background-color: #ffffff;
  padding: 20rpx 0;
  border-bottom: 1rpx solid #f0f0f0;
  box-shadow: 0 2rpx 8rpx rgba(0, 0, 0, 0.04);
}

.category-list {
  display: inline-flex;
  padding: 0 30rpx;
  gap: 20rpx;
}

.category-item {
  display: inline-block;
  padding: 14rpx 32rpx;
  background: linear-gradient(135deg, #f5f5f5 0%, #e8e8e8 100%);
  color: #666666;
  border-radius: 30rpx;
  font-size: 26rpx;
  font-weight: 500;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 2rpx 6rpx rgba(0, 0, 0, 0.06);
  position: relative;
  overflow: hidden;
}

.category-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(74, 144, 226, 0.1) 0%, rgba(102, 126, 234, 0.1) 100%);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.category-item:active::before {
  opacity: 1;
}

.category-item.active {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: #ffffff;
  box-shadow: 0 4rpx 12rpx rgba(102, 126, 234, 0.3);
  transform: translateY(-2rpx);
}

.category-item.active::before {
  opacity: 0;
}

/* 筛选面板 */
.filter-panel {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 200;
  pointer-events: none;
  transition: all 0.3s ease;
}

.filter-panel.show {
  pointer-events: auto;
}

.filter-panel::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  opacity: 0;
  transition: opacity 0.3s ease;
  backdrop-filter: blur(4rpx);
}

.filter-panel.show::before {
  opacity: 1;
}

.filter-content {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: #ffffff;
  border-radius: 30rpx 30rpx 0 0;
  padding: 40rpx 30rpx;
  transform: translateY(100%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 -4rpx 20rpx rgba(0, 0, 0, 0.1);
}

.filter-panel.show .filter-content {
  transform: translateY(0);
}

/* 课程列表 */
.course-list {
  padding: 20rpx 30rpx;
}

.result-count {
  font-size: 26rpx;
  color: #999999;
  margin-bottom: 20rpx;
  animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.course-card {
  background: linear-gradient(135deg, #ffffff 0%, #fafafa 100%);
  border-radius: 20rpx;
  padding: 30rpx;
  margin-bottom: 20rpx;
  box-shadow: 0 4rpx 16rpx rgba(0, 0, 0, 0.08);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
  animation: slideInUp 0.5s ease-out both;
}

.course-card:nth-child(1) { animation-delay: 0.05s; }
.course-card:nth-child(2) { animation-delay: 0.1s; }
.course-card:nth-child(3) { animation-delay: 0.15s; }
.course-card:nth-child(4) { animation-delay: 0.2s; }
.course-card:nth-child(5) { animation-delay: 0.25s; }

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

.course-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 6rpx;
  height: 100%;
  background: linear-gradient(180deg, #667eea 0%, #764ba2 100%);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.course-card:active {
  transform: scale(0.98);
  box-shadow: 0 8rpx 24rpx rgba(102, 126, 234, 0.15);
}

.course-card:active::before {
  opacity: 1;
}

/* 筛选面板 */
.filter-panel {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 200;
  display: none;
}

.filter-panel.show {
  display: block;
}

.filter-content {
  position: absolute;
  top: 200rpx;
  left: 30rpx;
  right: 30rpx;
  background-color: #ffffff;
  border-radius: 16rpx;
  padding: 40rpx;
}

.filter-item {
  display: flex;
  align-items: center;
  margin-bottom: 30rpx;
}

.filter-label {
  font-size: 28rpx;
  color: #333333;
  margin-right: 20rpx;
}

.picker-value {
  flex: 1;
  padding: 20rpx;
  background-color: #F5F5F5;
  border-radius: 8rpx;
  font-size: 28rpx;
}

.filter-actions {
  display: flex;
  gap: 20rpx;
  margin-top: 40rpx;
}

.reset-btn, .confirm-btn {
  flex: 1;
  height: 80rpx;
  line-height: 80rpx;
  border-radius: 40rpx;
  font-size: 28rpx;
}

.reset-btn {
  background-color: #F5F5F5;
  color: #666666;
}

.confirm-btn {
  background-color: #4A90E2;
  color: #ffffff;
}

/* 课程列表 */
.course-list {
  padding: 20rpx 30rpx;
}

.result-count {
  font-size: 26rpx;
  color: #999999;
  margin-bottom: 20rpx;
}

.count-number {
  color: #4A90E2;
  font-weight: bold;
}

.course-card {
  background-color: #ffffff;
  border-radius: 16rpx;
  padding: 30rpx;
  margin-bottom: 20rpx;
  box-shadow: 0 4rpx 20rpx rgba(0, 0, 0, 0.06);
}

.course-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 20rpx;
}

.course-title {
  flex: 1;
  font-size: 32rpx;
  font-weight: bold;
  color: #333333;
}

.favorite-btn {
  padding: 10rpx;
}

.favorite-icon {
  font-size: 36rpx;
}

.course-info {
  margin-bottom: 20rpx;
}

.info-row {
  display: flex;
  margin-bottom: 12rpx;
  font-size: 26rpx;
}

.info-label {
  color: #999999;
  width: 150rpx;
}

.info-value {
  flex: 1;
  color: #666666;
}

.course-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 20rpx;
  border-top: 1rpx solid #EEEEEE;
}

.course-tags {
  display: flex;
  gap: 10rpx;
}

.tag {
  padding: 8rpx 16rpx;
  border-radius: 6rpx;
  font-size: 22rpx;
}

.category-tag {
  background-color: #E8F4FF;
  color: #4A90E2;
}

.credit-tag {
  background-color: #FFF0E6;
  color: #FF8C42;
}

.enrollment-info {
  font-size: 24rpx;
  color: #999999;
}

/* 空状态 */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 100rpx 0;
}

.empty-icon {
  font-size: 100rpx;
  margin-bottom: 20rpx;
}

.empty-text {
  font-size: 28rpx;
  color: #999999;
}