/* 自定义CSS变量 - 定义设计令牌 */
:root {
  --primary-beige: #f5f5f0;
  --light-gray: #e8e8e3;
  --oatmeal: #d4cfc7;
  --text-black: #1a1a1a;
  --text-gray: #666;
  --font-elegant: 'HarmonyOS Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* 全局字体设置 */
body {
  font-family: var(--font-elegant);
  color: var(--text-black);
}

/* 图片悬停放大效果 */
.image-hover {
  overflow: hidden;
  transition: all 0.3s ease;
}

.image-hover img {
  transition: transform 0.5s ease, filter 0.3s ease;
}

.image-hover:hover img {
  transform: scale(1.05);
  filter: brightness(0.95);
}

/* 页面切换动画 */
.page-transition {
  animation: fadeIn 0.6s ease-in-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* 导航栏样式优化 */
.nav-link {
  position: relative;
  transition: color 0.3s ease;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--text-black);
  transition: width 0.3s ease;
}

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

/* 全屏背景样式 */
.fullscreen-bg {
  min-height: 100vh;
  background: linear-gradient(135deg, var(--primary-beige) 0%, var(--light-gray) 100%);
}

/* 网格布局增强 */
.grid-enhanced {
  display: grid;
  gap: 2rem;
  transition: gap 0.3s ease;
}

/* 响应式网格调整 */
@media (min-width: 768px) {
  .grid-enhanced {
    gap: 3rem;
  }
}

/* 文字阴影效果 */
.text-shadow-light {
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

/* 加载动画 */
.loading-skeleton {
  background: linear-gradient(90deg, var(--light-gray) 25%, var(--oatmeal) 50%, var(--light-gray) 75%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
}

@keyframes loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* 自定义滚动条 */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--primary-beige);
}

::-webkit-scrollbar-thumb {
  background: var(--oatmeal);
  border-radius: 4px;
}

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

/* 焦点状态样式 */
.focus-ring:focus {
  outline: 2px solid var(--oatmeal);
  outline-offset: 2px;
}

/* 响应式文字大小 */
.text-responsive {
  font-size: clamp(1rem, 2.5vw, 1.5rem);
}

/* 卡片悬停效果 */
.card-hover {
  transition: all 0.3s ease;
  border: 1px solid transparent;
}

.card-hover:hover {
  border-color: var(--oatmeal);
  transform: translateY(-4px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

/* 移动端优化 */
@media (max-width: 640px) {
  .mobile-padding {
    padding: 1rem;
  }
  
  .mobile-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
}

/* 打印样式 */
@media print {
  .no-print {
    display: none !important;
  }
  
  body {
    background: white !important;
    color: black !important;
  }
}

/* 无障碍优化 */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
  :root {
    --text-black: #000;
    --text-gray: #333;
  }
}

/* 减少动画支持 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}