/* 首页样式 */
main {
  padding: 30px 0;
}

/* 学习统计卡片 */
.stats-card {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 30px;
}

.stat-item {
  background: white;
  border-radius: 16px;
  padding: 30px 20px;
  text-align: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.stat-value {
  font-size: 2.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
}

.stat-label {
  color: #7f8c8d;
  font-size: 0.95rem;
}

/* 每日推荐 */
.recommend-card {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 16px;
  padding: 30px;
  display: flex;
  align-items: center;
  gap: 30px;
  color: white;
}

.recommend-icon {
  font-size: 4rem;
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.recommend-content h3 {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.recommend-content p {
  opacity: 0.9;
  margin-bottom: 20px;
  font-size: 1.1rem;
}

.recommend-content .btn-primary {
  background: white;
  color: #667eea;
}

.recommend-content .btn-primary:hover {
  background: #f0f0f0;
}

/* 模块卡片网格 */
.module-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
}

.module-card {
  color: white;
  padding: 30px 20px;
  border-radius: 16px;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 15px;
  transition: transform 0.3s, box-shadow 0.3s;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.module-card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.module-icon {
  font-size: 3rem;
}

.module-title {
  font-size: 1.4rem;
  font-weight: 600;
}

.module-desc {
  opacity: 0.9;
  font-size: 0.95rem;
}

/* OPW Level 卡片 */
.level-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 15px;
}

.level-card {
  background: white;
  border-radius: 12px;
  padding: 25px;
  text-align: center;
  text-decoration: none;
  color: inherit;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  transition: all 0.3s;
  border-left: 5px solid;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.level-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.level-1 { border-left-color: #FF6B6B; }
.level-2 { border-left-color: #FF8E53; }
.level-3 { border-left-color: #FFD93D; }
.level-4 { border-left-color: #6BCB77; }
.level-5 { border-left-color: #4D96FF; }

.level-number {
  font-size: 1.3rem;
  font-weight: 700;
  color: #2c3e50;
}

.level-name {
  color: #7f8c8d;
  font-size: 0.95rem;
}

.level-progress {
  font-size: 0.85rem;
  color: #667eea;
  font-weight: 500;
}

/* 快速入口 */
.quick-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 20px;
}

.quick-item {
  background: white;
  border-radius: 12px;
  padding: 30px 20px;
  text-align: center;
  text-decoration: none;
  color: inherit;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  transition: all 0.3s;
}

.quick-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.quick-icon {
  font-size: 2.5rem;
  margin-bottom: 10px;
}

.quick-name {
  font-size: 1.1rem;
  font-weight: 500;
  color: #2c3e50;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .stats-card {
    grid-template-columns: 1fr;
  }

  .recommend-card {
    flex-direction: column;
    text-align: center;
  }

  .module-grid {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  }

  .level-cards {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  }
}