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

body {
  font-family: 'Segoe UI', sans-serif;
  background: #f0f2f5;
  line-height: 1.6;
}

.navbar {
  background: #2c3e50;
  color: white;
  padding: 2rem;
  text-align: center;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.navbar h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

/* 工具网格布局 */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  padding: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

/* 工具卡片样式 */
.tool-card {
  background: white;
  border-radius: 12px;
  padding: 2rem;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  cursor: pointer;
  text-decoration: none;
  color: #333;
  display: block;
}

.tool-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 16px rgba(0,0,0,0.1);
}

.tool-card i {
  font-size: 2.5rem;
  color: #3498db;
  margin-bottom: 1rem;
}

.tool-card h2 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: #2c3e50;
}

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