/* 全局样式重置 */
* {
  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: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
}

.App {
  min-height: 100vh;
  color: #333;
}

/* 头部样式 */
.main-header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  padding: 1rem 2rem;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 100;
}

.main-header .title {
  font-size: 1.5rem;
  font-weight: 700;
  color: #4a5568;
  margin-bottom: 0.5rem;
}

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

.nav-link {
  text-decoration: none;
  color: #4a5568;
  font-weight: 500;
  transition: color 0.3s ease;
}

.nav-link:hover {
  color: #667eea;
}

/* 主要内容区域 */
.main-content {
  padding: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

/* 英雄区域 */
.hero-section {
  text-align: center;
  padding: 4rem 0;
  margin-bottom: 3rem;
}

.hero-content {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(20px);
  border-radius: 20px;
  padding: 3rem;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.hero-title {
  font-size: 3rem;
  font-weight: 800;
  color: white;
  margin-bottom: 1.5rem;
  text-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

.hero-description {
  font-size: 1.2rem;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 2rem;
  line-height: 1.6;
}

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

.hero-btn {
  padding: 0.75rem 2rem;
  border: none;
  border-radius: 50px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  display: inline-block;
}

.hero-btn.primary {
  background: linear-gradient(45deg, #ff6b6b, #ee5a24);
  color: white;
  box-shadow: 0 4px 15px rgba(255, 107, 107, 0.4);
}

.hero-btn.secondary {
  background: rgba(255, 255, 255, 0.2);
  color: white;
  border: 2px solid rgba(255, 255, 255, 0.3);
}

.hero-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

/* 计数器组件 */
.counter-container {
  background: white;
  border-radius: 15px;
  padding: 2rem;
  margin: 2rem 0;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  text-align: center;
}

.counter-container h2 {
  margin-bottom: 1.5rem;
  color: #4a5568;
}

.counter-display {
  font-size: 2rem;
  font-weight: 700;
  color: #667eea;
  margin-bottom: 2rem;
  padding: 1rem;
  background: #f7fafc;
  border-radius: 10px;
}

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

.counter-btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 10px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  min-width: 80px;
}

.counter-btn.increment {
  background: linear-gradient(45deg, #48bb78, #38a169);
  color: white;
}

.counter-btn.decrement {
  background: linear-gradient(45deg, #f56565, #e53e3e);
  color: white;
}

.counter-btn.reset {
  background: linear-gradient(45deg, #a0aec0, #718096);
  color: white;
}

.counter-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

/* 特性区域 */
.features-section {
  margin: 3rem 0;
}

.section-title {
  text-align: center;
  font-size: 2.5rem;
  font-weight: 700;
  color: white;
  margin-bottom: 3rem;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  padding: 0 1rem;
}

.feature-card {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(20px);
  border-radius: 15px;
  padding: 2rem;
  text-align: center;
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: all 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
  background: rgba(255, 255, 255, 0.15);
}

.feature-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.feature-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: white;
  margin-bottom: 1rem;
}

.feature-description {
  color: rgba(255, 255, 255, 0.9);
  line-height: 1.6;
}

/* 动态内容区域 */
.dynamic-section {
  background: white;
  border-radius: 15px;
  padding: 2rem;
  margin: 2rem 0;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.dynamic-controls {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.toggle-btn, .add-item-btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 10px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.toggle-btn {
  background: linear-gradient(45deg, #667eea, #764ba2);
  color: white;
}

.add-item-btn {
  background: linear-gradient(45deg, #48bb78, #38a169);
  color: white;
}

.dynamic-content {
  animation: fadeIn 0.3s ease-in;
}

.items-list {
  list-style: none;
}

.list-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  margin-bottom: 0.5rem;
  background: #f7fafc;
  border-radius: 8px;
  border-left: 4px solid #667eea;
}

.item-text {
  font-weight: 500;
}

.remove-btn {
  background: #f56565;
  color: white;
  border: none;
  border-radius: 50%;
  width: 24px;
  height: 24px;
  cursor: pointer;
  font-weight: bold;
  transition: all 0.3s ease;
}

.remove-btn:hover {
  background: #e53e3e;
  transform: scale(1.1);
}

/* 表单区域 */
.form-section {
  background: white;
  border-radius: 15px;
  padding: 2rem;
  margin: 2rem 0;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.contact-form {
  max-width: 500px;
  margin: 0 auto;
}

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

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: #4a5568;
}

.form-input, .form-textarea {
  width: 100%;
  padding: 0.75rem;
  border: 2px solid #e2e8f0;
  border-radius: 8px;
  font-size: 1rem;
  transition: border-color 0.3s ease;
  font-family: inherit;
}

.form-input:focus, .form-textarea:focus {
  outline: none;
  border-color: #667eea;
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

.submit-btn {
  width: 100%;
  padding: 0.75rem;
  background: linear-gradient(45deg, #667eea, #764ba2);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.submit-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

/* 页脚 */
.main-footer {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(20px);
  text-align: center;
  padding: 2rem;
  color: white;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
}

/* 动画 */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 响应式设计 */
@media (max-width: 768px) {
  .main-content {
    padding: 1rem;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-content {
    padding: 2rem 1rem;
  }
  
  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .hero-btn {
    width: 200px;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  
  .counter-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .dynamic-controls {
    flex-direction: column;
  }
  
  .navigation .nav-list {
    flex-direction: column;
    gap: 0.5rem;
  }
}

/* 设计模式高亮样式（当启用设计模式时显示） */
[data-source-info]:hover {
  outline: 2px dashed #667eea !important;
  outline-offset: 2px !important;
  cursor: pointer !important;
  position: relative !important;
}

[data-source-info]:hover::after {
  content: attr(data-source-info);
  position: absolute;
  bottom: 100%;
  left: 0;
  background: #333;
  color: white;
  padding: 0.5rem;
  border-radius: 4px;
  font-size: 0.8rem;
  white-space: nowrap;
  z-index: 1000;
  opacity: 0;
  animation: fadeIn 0.3s ease-in forwards;
}