/**
 * 优化的网格样式 - 替代JavaScript中的样式操作
 * 使用CSS类而不是JavaScript直接操作样式，提高性能
 */

/* 基础网格样式 */
.portfolio__grid {
  display: grid;
  transition: all 0.3s ease;
}

/* 移动端 - 1列 */
.portfolio-grid--mobile {
  grid-template-columns: 1fr;
  gap: 1rem;
  padding: 1rem 0.5rem;
}

.portfolio-grid--mobile .portfolio__container {
  padding: 0 0.75rem;
}

.portfolio-grid--mobile .portfolio__title {
  font-size: 1.25rem;
}

/* 平板端 - 2列 */
.portfolio-grid--tablet {
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  padding: 1.5rem 0;
}

.portfolio-grid--tablet .portfolio__container {
  padding: 0 1rem;
}

.portfolio-grid--tablet .portfolio__title {
  font-size: 1rem;
}

/* 桌面端 - 3列 */
.portfolio-grid--desktop {
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
  padding: 2rem 0;
}

.portfolio-grid--desktop .portfolio__container {
  padding: 0 1.5rem;
}

.portfolio-grid--desktop .portfolio__title {
  font-size: 1rem;
}

/* 大屏幕 - 4列 */
.portfolio-grid--large {
  grid-template-columns: repeat(4, 1fr);
  gap: 0.25rem;
  padding: 2rem 0;
}

.portfolio-grid--large .portfolio__container {
  padding: 0 0.938rem;
}

.portfolio-grid--large .portfolio__title {
  font-size: 1rem;
}

/* 媒体保护优化 */
.protected-media {
  pointer-events: none;
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  -webkit-touch-callout: none;
  -webkit-user-drag: none;
  -khtml-user-drag: none;
  -moz-user-drag: none;
  -o-user-drag: none;
}

/* 返回顶部按钮优化 */
.back-to-top {
  transition: opacity 0.3s ease;
  will-change: opacity;
}

/* 性能优化：减少重绘 */
.portfolio__item {
  will-change: transform;
}

.portfolio__overlay {
  will-change: opacity;
}

/* 加载状态优化 */
.portfolio__empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: 2rem;
  color: #666;
  font-size: 1.1rem;
}