@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700&display=swap');

:root {
  /* 设计令牌 - 颜色 */
  --color-primary: #ffffff;
  --color-secondary: #f5f5f5;
  --color-accent: #e0e0e0;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-text-lighter: #999999;
  
  /* 设计令牌 - 间距 */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  
  /* 设计令牌 - 圆角 */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  
  /* 设计令牌 - 阴影 */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
  
  /* 设计令牌 - 过渡 */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: var(--color-text);
  line-height: 1.6;
  background-color: var(--color-primary);
}

/* 导航动画 */
.nav-link {
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-text);
  transition: width var(--transition-normal);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* 图片悬停效果 */
.image-hover {
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  cursor: pointer;
}

.image-hover:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

/* 色块悬停效果 */
.color-block {
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  cursor: pointer;
}

.color-block:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-md);
}

/* 页面过渡动画 */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn 0.6s ease-out;
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.slide-in-left {
  animation: slideInLeft 0.6s ease-out;
}

/* 轮播图动画 */
.carousel-item {
  transition: opacity var(--transition-slow);
}

/* 按钮悬停效果 */
.btn-hover {
  transition: all var(--transition-fast);
  border: 1px solid transparent;
}

.btn-hover:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* 文字渐入效果 */
.text-reveal {
  overflow: hidden;
}

.text-reveal span {
  display: inline-block;
  animation: textReveal 0.8s ease-out forwards;
  opacity: 0;
}

@keyframes textReveal {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 响应式网格布局 */
.material-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-md);
  padding: var(--spacing-md);
}

/* 步骤指示器 */
.step-indicator {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: var(--color-accent);
  color: var(--color-text);
  font-weight: 500;
  transition: all var(--transition-fast);
}

.step-indicator.active {
  background-color: var(--color-text);
  color: var(--color-primary);
  transform: scale(1.1);
}

/* 加载动画 */
@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.loading-pulse {
  animation: pulse 1.5s ease-in-out infinite;
}

/* 滚动条样式 */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--color-accent);
  border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-light);
}