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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: #333;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
}

/* 导航栏 */
header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 100;
}

nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: #667eea;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-links a {
  text-decoration: none;
  color: #333;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  transition: all 0.3s ease;
}

.nav-links a:hover,
.nav-links a.active {
  background: #667eea;
  color: white;
}

/* 主要内容 */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
  background: white;
  border-radius: 16px;
  margin: 2rem;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

/* 首页英雄区域 */
.hero {
  text-align: center;
  padding: 4rem 2rem;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border-radius: 12px;
  margin-bottom: 3rem;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.2rem;
  margin-bottom: 2rem;
  opacity: 0.9;
}

.cta-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* 按钮样式 */
.btn {
  display: inline-block;
  padding: 1rem 2rem;
  text-decoration: none;
  border-radius: 8px;
  font-weight: 500;
  transition: all 0.3s ease;
  border: 2px solid transparent;
}

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

.btn.primary:hover {
  background: #f8f9fa;
  transform: translateY(-2px);
}

.btn.secondary {
  background: transparent;
  color: white;
  border-color: white;
}

.btn.secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}

/* 特性卡片 */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

.feature-card {
  background: #f8f9fa;
  padding: 2rem;
  border-radius: 12px;
  text-align: center;
  transition: transform 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-5px);
}

.feature-card h3 {
  color: #667eea;
  margin-bottom: 1rem;
}

/* 统计数据 */
.stats {
  text-align: center;
  margin-bottom: 3rem;
}

.stats h2 {
  margin-bottom: 2rem;
  color: #333;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
}

.stat-item {
  background: #f8f9fa;
  padding: 2rem;
  border-radius: 12px;
}

.stat-number {
  display: block;
  font-size: 2.5rem;
  font-weight: bold;
  color: #667eea;
}

.stat-label {
  display: block;
  color: #666;
  font-size: 1.1rem;
}

/* 工具网格 */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

.tool-card {
  background: #f8f9fa;
  padding: 2rem;
  border-radius: 12px;
  text-align: center;
  transition: transform 0.3s ease;
}

.tool-card:hover {
  transform: translateY(-5px);
}

.tool-card h3 {
  color: #667eea;
  margin-bottom: 1rem;
}

.tool-btn {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.8rem 1.5rem;
  background: #667eea;
  color: white;
  text-decoration: none;
  border-radius: 8px;
  transition: background 0.3s ease;
}

.tool-btn:hover {
  background: #5a67d8;
}

/* 页面头部 */
.page-header {
  text-align: center;
  margin-bottom: 3rem;
}

.page-header h1 {
  font-size: 2.5rem;
  color: #333;
  margin-bottom: 1rem;
}

.page-header p {
  color: #666;
  font-size: 1.1rem;
}

/* 关于页面 */
.about-content {
  max-width: 800px;
  margin: 0 auto;
}

.about-section {
  margin-bottom: 2rem;
  padding: 2rem;
  background: #f8f9fa;
  border-radius: 12px;
}

.about-section h2 {
  color: #667eea;
  margin-bottom: 1rem;
}

.about-section ul {
  margin-left: 2rem;
  margin-top: 1rem;
}

.about-section li {
  margin-bottom: 0.5rem;
}

/* API 页面 */
.api-content {
  max-width: 800px;
  margin: 0 auto;
}

.api-section {
  margin-bottom: 2rem;
  padding: 2rem;
  background: #f8f9fa;
  border-radius: 12px;
}

.api-section h2 {
  color: #667eea;
  margin-bottom: 1rem;
}

.code-block {
  background: #2d3748;
  color: #e2e8f0;
  padding: 1rem;
  border-radius: 8px;
  margin: 1rem 0;
  font-family: 'Courier New', monospace;
  overflow-x: auto;
}

/* 页脚 */
footer {
  text-align: center;
  padding: 2rem;
  color: white;
  margin-top: 2rem;
}

footer p {
  margin-bottom: 0.5rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
  nav {
    flex-direction: column;
    gap: 1rem;
    padding: 1rem;
  }
  
  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  main {
    margin: 1rem;
    padding: 1rem;
  }
  
  .cta-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
}