.plan-page {
  min-height: 100vh;
  background: #fff;
}

.cooper-content {
  position: relative;
  padding: 40px 0;
  background: #fff;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  position: relative;
}

/* 知识区域样式 */
.knowledge-section {
  margin-bottom: 60px;
}

.knowledge-layout {
  display: flex;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  overflow: hidden;
  min-height: 400px;
}

/* 左侧导航样式 */
.knowledge-nav {
  width: 300px;
  background: #40E0D0;
  padding: 0;
  flex-shrink: 0;
}

.nav-title {
  background: #2acbd8;
  color: white;
  padding: 20px;
  font-size: 18px;
  font-weight: bold;
  text-align: center;
  margin: 0;
}

.nav-list {
  padding: 0;
  margin: 0;
}

.nav-item {
  padding: 15px 20px;
  color: white;
  cursor: pointer;
  transition: all 0.3s ease;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 14px;
  line-height: 1.4;
}

.nav-item:hover {
  background: rgba(255, 255, 255, 0.1);
}

.nav-item.active {
  background: rgba(255, 255, 255, 0.25);
  font-weight: bold;
}

.nav-item.empty {
  cursor: default;
  opacity: 0.8;
}

/* 右侧内容样式 */
.knowledge-content {
  flex: 1;
  padding: 40px;
  background: white;
  display: flex;
  align-items: flex-start;
}

.content-text {
  color: #333;
  font-size: 16px;
  line-height: 1.8;
  white-space: pre-line;
  width: 100%;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .cooper-content {
    padding: 20px 0;
  }

  .container {
    padding: 0 10px;
  }

  .knowledge-layout {
    flex-direction: column;
    min-height: auto;
  }

  .knowledge-nav {
    width: 100%;
  }

  .nav-title {
    padding: 15px;
    font-size: 16px;
  }

  .nav-item {
    padding: 12px 15px;
    font-size: 13px;
  }

  .knowledge-content {
    padding: 20px;
  }

  .content-text {
    font-size: 14px;
    line-height: 1.6;
  }
}

@media (max-width: 480px) {
  .knowledge-content {
    padding: 15px;
  }

  .content-text {
    font-size: 13px;
  }
}