/* 首页活动预告：跟手轮播、彩色马赛克页码和原图保存。 */

/* 每个轨道面板占一个视口，首尾克隆用于连续循环。 */
.activity-stage,
.activity-viewer-surface {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 7;
  touch-action: pan-y pinch-zoom;
}
.activity-track {
  display: flex;
  width: 100%;
  height: 100%;
  will-change: transform;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}
.activity-track > * {
  flex: 0 0 100%;
  min-width: 0;
  height: 100%;
}
.activity-board .activity-slide {
  display: block;
  width: 100%;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: zoom-in;
  -webkit-tap-highlight-color: transparent;
}
.activity-track img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  -webkit-user-drag: none;
}
.activity-board .activity-slide img {
  user-select: none;
  -webkit-user-select: none;
}

/* 半透明像素箭头，手机及平板只在交互时短暂显示。 */
.activity-arrow {
  position: absolute;
  top: 50%;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid #ffffffc7;
  color: #181818;
  background: #ffffff91;
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transform: translateY(-50%);
}
.activity-arrow:hover,
.activity-arrow:focus-visible {
  background: #ffffffdc;
}
.activity-arrow[data-activity-prev] {
  left: 18px;
}
.activity-arrow[data-activity-next] {
  right: 18px;
}
.activity-arrow svg {
  width: 22px;
  height: 22px;
}

/* 方块面积表示选中状态，每张海报有独立的马赛克颜色。 */
.activity-dots {
  display: flex;
  justify-content: center;
  gap: 0;
  margin-top: 4px;
}
.activity-dot {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  padding: 0;
  border: 0;
  background: transparent;
}
.activity-dot::before {
  content: "";
  width: 10px;
  height: 10px;
  background: var(--activity-color);
  opacity: 0.55;
  transition: opacity 140ms ease;
}
.activity-dot[aria-current="true"]::before {
  width: 14px;
  height: 14px;
  opacity: 1;
  outline: 1px solid #181818;
  outline-offset: 3px;
}

/* 原图弹窗：红色关闭和保存按钮；图片保留系统长按菜单。 */
dialog.activity-dialog {
  width: min(1440px, calc(100% - 32px));
  max-width: none;
  max-height: calc(100vh - 32px);
  max-height: calc(100dvh - 32px);
  padding: 18px;
  overflow: auto;
}
.activity-dialog .activity-toolbar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding-bottom: 14px;
}
.activity-dialog .activity-heading {
  flex: 1;
  min-width: 0;
}
.activity-dialog .activity-title {
  font-family: var(--pixel-font);
  font-size: clamp(1rem, 2vw, 1.5rem);
  font-weight: 700;
  line-height: 1.35;
}
.activity-dialog .activity-count {
  font-family: var(--pixel-font);
  font-size: 0.75rem;
}
.activity-dialog .dialog-close {
  position: static;
  flex: 0 0 44px;
  width: 44px;
  height: 44px;
  margin: 0;
  border: 1px solid #a41e30;
  background: #bd3042;
  color: #fff;
}
.activity-dialog .dialog-close svg {
  stroke-width: 2.5;
}
.activity-viewer {
  position: relative;
}
.activity-viewer-surface {
  width: 100%;
  max-height: calc(100vh - 204px);
  max-height: calc(100dvh - 204px);
}
.activity-save-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding-top: 14px;
}
.activity-save-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 16px;
  flex-shrink: 0;
}
.activity-save {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 9px;
  min-height: 44px;
  padding: 8px 16px;
  border: 1px solid #a41e30;
  background: #bd3042;
  color: #fff;
  font-family: var(--pixel-font);
  font-weight: 700;
  line-height: 1.4;
}
.activity-save:hover,
.activity-dialog .dialog-close:hover {
  background: #a41e30;
}
.activity-save:disabled {
  opacity: 0.65;
  cursor: progress;
}
.activity-save svg {
  width: 20px;
  height: 20px;
}
.activity-download {
  color: #a41e30;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  text-decoration: underline;
  text-underline-offset: 4px;
  font-family: var(--pixel-font);
  font-size: 0.875rem;
}
.activity-save-hint {
  font-size: 0.75rem;
  line-height: 1.6;
}

@media (max-width: 1024px), (hover: none) and (pointer: coarse) {
  .activity-board .activity-arrow,
  .activity-dialog .activity-arrow {
    width: 32px;
    height: 32px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 140ms ease;
  }
  .activity-arrow svg {
    width: 16px;
    height: 16px;
  }
  /* 小图标保留 44px 触摸区域；隐藏时不拦截图片。 */
  .activity-arrow::after {
    content: "";
    position: absolute;
    inset: -6px;
  }
  .activity-board[data-arrows-visible] .activity-arrow,
  .activity-dialog[data-arrows-visible] .activity-arrow,
  .activity-board .activity-arrow:focus-visible,
  .activity-dialog .activity-arrow:focus-visible {
    opacity: 1;
    pointer-events: auto;
  }
  .activity-arrow[data-activity-prev] {
    left: 9px;
  }
  .activity-arrow[data-activity-next] {
    right: 9px;
  }
}
@media (max-width: 600px) {
  dialog.activity-dialog {
    width: calc(100% - 16px);
    padding: 12px;
  }
  .activity-dialog .activity-toolbar {
    gap: 8px;
    padding-bottom: 10px;
  }
  .activity-save-row {
    flex-wrap: wrap;
    gap: 8px;
  }
  .activity-save-actions {
    gap: 8px 12px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .activity-arrow,
  .activity-dot::before {
    transition: none;
  }
}