/* 基础样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
    sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-color: #f5f5f5;
  color: #333;
}

/* 容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 头部样式 */
.header {
  background-color: #2c3e50;
  color: white;
  padding: 1rem 0;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.header h1 {
  font-size: 2rem;
  font-weight: 600;
}

/* 卡片样式 */
.card {
  background: white;
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 1rem;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  transition: transform 0.2s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

/* 按钮样式 */
.btn {
  display: inline-block;
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.2s ease;
}

.btn-primary {
  background-color: #3498db;
  color: white;
}

.btn-primary:hover {
  background-color: #2980b9;
}

.btn-secondary {
  background-color: #95a5a6;
  color: white;
}

.btn-secondary:hover {
  background-color: #7f8c8d;
}

.btn-danger {
  background-color: #e74c3c;
  color: white;
}

.btn-danger:hover {
  background-color: #c0392b;
}

/* 表单样式 */
.form-group {
  margin-bottom: 1rem;
}

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.form-control {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 1rem;
}

.form-control:focus {
  outline: none;
  border-color: #3498db;
  box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

/* 评论样式 */
.comments-section {
  margin-top: 2rem;
}

.comment {
  border-bottom: 1px solid #eee;
  padding: 1rem 0;
}

.comment:last-child {
  border-bottom: none;
}

.comment-author {
  font-weight: 600;
  color: #2c3e50;
  margin-bottom: 0.5rem;
}

.comment-content {
  line-height: 1.5;
  color: #555;
}

.comment-date {
  font-size: 0.8rem;
  color: #999;
  margin-top: 0.5rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .container {
    padding: 0 10px;
  }
  
  .header h1 {
    font-size: 1.5rem;
  }
  
  .card {
    padding: 1rem;
  }
}