/* 活动页整体布局 */
body {
  background:
    radial-gradient(circle at 10% 0%, rgba(0, 212, 255, 0.25), transparent 60%),
    radial-gradient(circle at 90% 100%, rgba(255, 0, 255, 0.2), transparent 55%),
    linear-gradient(135deg, rgba(0, 5, 20, 0.95), rgba(3, 12, 30, 0.97));
  color: #f5f5f5;
  overflow-x: hidden;
}

.activity-page {
  margin-left: 240px; /* ❗确保不会被左侧导航遮挡 */
  padding: 60px 5vw;
  position: relative;
  z-index: 2;
}

.activity-title {
  font-size: clamp(28px, 3vw, 36px);
  color: #00d4ff;
  text-shadow: 0px 0px 14px rgba(0, 212, 255, 0.9);
}

.activity-desc {
  font-size: 14px;
  margin-bottom: 40px;
  color: rgba(230, 230, 230, 0.8);
  max-width: 600px;
}

/* 无限轮播外层容器 */
.activity-flow-wrapper {
  width: calc(100% - 240px);
  overflow: hidden;
}

/* 无限滚动轨道 */
.activity-flow {
  display: flex;
  gap: 40px;
  will-change: transform;
}

/* 卡片（海报式） */
.activity-card {
  flex: 0 0 auto;
  width: clamp(320px, 32vw, 600px);
  background: rgba(8, 8, 20, 0.85);
  border-radius: 18px;
  border: 1px solid rgba(0, 212, 255, 0.35);
  box-shadow: 0 18px 45px rgba(0, 0, 0, 0.6);
  padding: 26px 24px;
  backdrop-filter: blur(10px);

  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

/* 悬浮效果（如你截图） */
.activity-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 25px 60px rgba(0, 212, 255, 0.45);
  border-color: rgba(0, 212, 255, 0.9);
}

/* 卡片内部格式 */
.card-header {
  display: flex;
  justify-content: space-between;
  color: #00d4ff;
  font-size: 13px;
  margin-bottom: 10px;
}

.card-title {
  font-size: 22px;
  margin-bottom: 12px;
  color: #00eaff;
  text-shadow: 0 0 10px rgba(0, 212, 255, 0.7);
}

.card-tags {
  font-size: 13px;
  margin-bottom: 18px;
  color: rgba(220, 220, 220, 0.9);
}

.card-body {
  font-size: 14px;
  line-height: 1.7;
}

/* markdown 标题 */
.card-body h2,
.card-body h3 {
  color: #00d4ff;
  margin: 18px 0 6px;
}

.activity-flow {
    position: relative;
    overflow: hidden;
    width: 100%;
    height: auto;
}