/* 基础样式和变量 */
:root {
  --primary-color: #2196F3;
  --primary-dark: #1976D2;
  --secondary-color: #FFC107;
  --success-color: #4CAF50;
  --error-color: #F44336;
  --warning-color: #FF9800;
  --text-primary: #212121;
  --text-secondary: #757575;
  --background: #ffffff;
  --surface: #f5f5f5;
  --border: #e0e0e0;
  --shadow: rgba(0, 0, 0, 0.1);
  --radius: 8px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 暗色主题 */
[data-theme="dark"] {
  --text-primary: #ffffff;
  --text-secondary: #b0b0b0;
  --background: #121212;
  --surface: #1e1e1e;
  --border: #333333;
  --shadow: rgba(0, 0, 0, 0.3);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--background);
  transition: var(--transition);
}

#app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* 头部样式 */
.app-header {
  background: var(--primary-color);
  color: white;
  padding: 1rem 0;
  box-shadow: 0 2px 8px var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

.app-header h1 {
  text-align: center;
  margin-bottom: 1rem;
  font-size: 1.8rem;
  font-weight: 600;
}

/* 导航样式 */
.nav {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  padding: 0 1rem;
}

.nav-link {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  transition: var(--transition);
  font-weight: 500;
}

.nav-link:hover {
  background: rgba(255, 255, 255, 0.1);
  color: white;
}

.nav-link.active {
  background: rgba(255, 255, 255, 0.2);
  color: white;
}

/* 主内容区域 */
.main-content {
  flex: 1;
  padding: 2rem 1rem;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.content-section {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: 0 2px 16px var(--shadow);
  margin-bottom: 2rem;
}

.hero {
  text-align: center;
  padding: 3rem 2rem;
}

.hero h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.hero p {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-bottom: 3rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* 功能网格 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin: 3rem 0;
}

.feature-card {
  background: var(--background);
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: 0 4px 12px var(--shadow);
  transition: var(--transition);
  border: 1px solid var(--border);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px var(--shadow);
}

.feature-card h3 {
  font-size: 1.3rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.feature-card p {
  color: var(--text-secondary);
}

/* 按钮样式 */
.btn-primary, .btn-secondary, .btn-outline, .btn-small {
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  display: inline-block;
  text-align: center;
}

.btn-primary {
  background: var(--primary-color);
  color: white;
}

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

.btn-secondary {
  background: var(--surface);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--border);
}

.btn-outline {
  background: transparent;
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
}

.btn-outline:hover {
  background: var(--primary-color);
  color: white;
}

.btn-small {
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
}

/* 操作按钮区域 */
.actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 2rem;
}

/* 功能列表样式 */
.features-list {
  display: grid;
  gap: 2rem;
  margin: 2rem 0;
}

.feature-item {
  background: var(--background);
  padding: 2rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: 0 2px 8px var(--shadow);
}

.feature-item h3 {
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.feature-item p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

/* 导航测试按钮 */
.nav-test-buttons {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.test-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin: 1rem 0;
}

/* 性能统计 */
.performance-stats {
  background: var(--surface);
  padding: 1rem;
  border-radius: var(--radius);
  margin-top: 1rem;
}

.stat-item {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.stat-label {
  color: var(--text-secondary);
}

.stat-value {
  font-weight: 600;
  color: var(--primary-color);
}

/* 技术标签 */
.tech-stack {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin: 1rem 0;
}

.tech-tag {
  background: var(--primary-color);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: calc(var(--radius) / 2);
  font-size: 0.875rem;
  font-weight: 500;
}

/* 联系表单 */
.contact-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  margin: 2rem 0;
}

.contact-form {
  background: var(--background);
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: 0 2px 12px var(--shadow);
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem;
  background: var(--background);
  color: var(--text-primary);
  transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.1);
}

.contact-info {
  background: var(--background);
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: 0 2px 12px var(--shadow);
}

.info-item {
  margin-bottom: 1rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
}

.info-item strong {
  color: var(--text-primary);
  margin-right: 0.5rem;
}

/* 导航测试区域 */
.nav-test-section {
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.history-info {
  margin-top: 1rem;
  padding: 1rem;
  background: var(--surface);
  border-radius: var(--radius);
}

.history-info p {
  margin: 0.25rem 0;
  font-size: 0.9rem;
}

/* 面包屑导航 */
.navigation-breadcrumb {
  margin-top: 2rem;
  padding: 1rem;
  background: var(--surface);
  border-radius: var(--radius);
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* 页脚 */
.app-footer {
  background: var(--surface);
  text-align: center;
  padding: 2rem;
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
}

/* 响应式设计 */
@media (max-width: 768px) {
  .contact-container {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .hero h2 {
    font-size: 2rem;
  }
  
  .nav {
    gap: 0.25rem;
  }
  
  .nav-link {
    padding: 0.4rem 0.8rem;
    font-size: 0.9rem;
  }
  
  .main-content {
    padding: 1rem;
  }
  
  .content-section {
    padding: 1.5rem;
  }
}

@media (max-width: 480px) {
  .actions {
    flex-direction: column;
    align-items: center;
  }
  
  .test-buttons {
    flex-direction: column;
  }
  
  .nav-test-buttons {
    flex-direction: column;
  }
}