/* AIHub 顶部活动通知栏 —— 前台样式 */
#aihubn-bar {
  --aihubn-bg: linear-gradient(90deg, #6d28d9, #a855f7);
  --aihubn-color: #fff;
  --aihubn-height: 40px;
  --aihubn-radius: 0px;
  --aihubn-interval: 5s;
  --aihubn-speed: 40s;
  --aihubn-maxwidth: 1200px;

  position: relative;
  width: 100%;
  min-height: var(--aihubn-height);
  background: var(--aihubn-bg);
  color: var(--aihubn-color);
  font-size: 14px;
  line-height: 1.4;
  z-index: 99998;
  box-shadow: 0 1px 6px rgba(0, 0, 0, .12);
  overflow: hidden;
}
#aihubn-bar.is-sticky { position: sticky; top: 0; }
#aihubn-bar[hidden] { display: none; }

/* 居中限宽模式：栏通栏，内容盒限宽 */
#aihubn-bar .aihubn-inner {
  height: var(--aihubn-height);
  display: flex;
  align-items: center;
  overflow: hidden;
}
#aihubn-bar.is-boxed .aihubn-inner {
  max-width: var(--aihubn-maxwidth);
  margin: 0 auto;
  padding: 0 16px;
}
#aihubn-bar.is-full .aihubn-inner { padding: 0 44px 0 16px; }

/* 轨道 + 单条 */
#aihubn-bar .aihubn-track {
  display: flex;
  align-items: center;
  gap: 32px;
  width: 100%;
}
#aihubn-bar .aihubn-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: inherit;
  text-decoration: none;
  white-space: nowrap;
  border-radius: var(--aihubn-radius);
  padding: 2px 0;
}
#aihubn-bar a.aihubn-item:hover .aihubn-text { text-decoration: underline; }
#aihubn-bar .aihubn-img {
  height: calc(var(--aihubn-height) - 16px);
  max-height: 26px;
  width: auto;
  border-radius: 4px;
  display: block;
}
#aihubn-bar .aihubn-text { display: inline-block; }

/* 关闭按钮 */
#aihubn-bar .aihubn-close {
  position: absolute;
  top: 50%;
  right: 12px;
  transform: translateY(-50%);
  width: 24px;
  height: 24px;
  line-height: 22px;
  text-align: center;
  font-size: 20px;
  color: inherit;
  background: transparent;
  border: 0;
  border-radius: 50%;
  cursor: pointer;
  opacity: .8;
}
#aihubn-bar .aihubn-close:hover { opacity: 1; background: rgba(255, 255, 255, .18); }

/* —— 静态：只显示第一条，居中 —— */
#aihubn-bar.aihubn-mode-static .aihubn-track { justify-content: center; }

/* —— 轮播：叠放，逐条淡入（由 JS 控制 .is-active）—— */
#aihubn-bar.aihubn-mode-carousel .aihubn-track {
  position: relative;
  display: block;
  height: var(--aihubn-height);
}
#aihubn-bar.aihubn-mode-carousel .aihubn-item {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  opacity: 0;
  visibility: hidden;
  transition: opacity .5s ease;
  pointer-events: none;
}
#aihubn-bar.aihubn-mode-carousel .aihubn-item.is-active {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

/* —— 跑马灯：轨道整体平移，无缝循环 —— */
#aihubn-bar.aihubn-mode-marquee .aihubn-track {
  width: max-content;
  animation: aihubn-scroll var(--aihubn-speed) linear infinite;
}
#aihubn-bar.aihubn-mode-marquee:hover .aihubn-track { animation-play-state: paused; }
@keyframes aihubn-scroll {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}
@media (prefers-reduced-motion: reduce) {
  #aihubn-bar.aihubn-mode-marquee .aihubn-track { animation: none; }
}

@media (max-width: 640px) {
  #aihubn-bar { font-size: 13px; }
  #aihubn-bar .aihubn-track { gap: 22px; }
}