/* 课程列表页简约风格样式 */
:root {
  --primary-color: #3498db;
  --secondary-color: #2c3e50;
  --accent-color: #e74c3c;
  --background-color: #f8f9fa;
  --card-background: #ffffff;
  --text-color: #333333;
  --text-light: #666666;
  --border-color: #e1e4e8;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --border-radius: 8px;
  --transition: all 0.3s ease;
}

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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--background-color);
  padding: 0;
  margin: 0;
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 20px;
}

header {
  background-color: var(--secondary-color);
  color: white;
  padding: 20px 0;
  margin-bottom: 30px;
  box-shadow: var(--shadow);
}

.header-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 0 20px;
}

h1 {
  font-size: 2.2rem;
  margin-bottom: 15px;
  font-weight: 600;
}

.back-link {
  display: inline-block;
  margin-top: 10px;
  color: white;
  text-decoration: none;
  padding: 8px 15px;
  background-color: rgba(255, 255, 255, 0.2);
  border-radius: 20px;
  transition: var(--transition);
}

.back-link:hover {
  background-color: rgba(255, 255, 255, 0.3);
}

.back-link i {
  margin-right: 5px;
}

.course-list {
  background-color: var(--card-background);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.course-list ul {
  list-style: none;
  padding: 0;
}

.course-list li {
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

.course-list li:last-child {
  border-bottom: none;
}

.course-list li:hover {
  background-color: rgba(52, 152, 219, 0.05);
}

.course-list a {
  display: block;
  padding: 15px 20px;
  color: var(--text-color);
  text-decoration: none;
  transition: var(--transition);
}

.course-list a:hover {
  color: var(--primary-color);
}

footer {
  background-color: var(--secondary-color);
  color: white;
  text-align: center;
  padding: 20px;
  margin-top: 40px;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .container {
    padding: 15px;
  }
  
  h1 {
    font-size: 1.8rem;
  }
  
  .course-list a {
    padding: 12px 15px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 10px;
  }
  
  h1 {
    font-size: 1.5rem;
  }
  
  .course-list a {
    padding: 10px;
    font-size: 0.95rem;
  }
}