.online-activities-grid > .online-activity-column {
  display: flex;
  align-items: stretch;
}

.online-activity-card {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 520px;
  overflow: hidden;
  background: #fff;
  border: 1px solid #e5eaee;
  border-radius: 17px;
  box-shadow: 0 9px 27px rgba(18, 39, 64, .07);
  transition: transform .24s ease, border-color .24s ease, box-shadow .24s ease;
}

.online-activity-card:hover {
  transform: translateY(-5px);
  border-color: #d0e5d7;
  box-shadow: 0 17px 36px rgba(18, 39, 64, .13);
}

.online-activity-visual {
  position: relative;
  display: grid;
  flex: 0 0 220px;
  height: 220px;
  overflow: hidden;
  place-items: center;
  background: linear-gradient(135deg, #e5f2e9, #dce9f0);
}

.online-activity-visual::after {
  position: absolute;
  z-index: 1;
  inset: 35% 0 0;
  background: linear-gradient(180deg, transparent, rgba(8, 23, 35, .4));
  content: '';
  pointer-events: none;
}

.online-activity-visual > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .5s ease;
}

.online-activity-card:hover .online-activity-visual > img { transform: scale(1.045); }

.online-activity-placeholder {
  display: grid;
  width: 100%;
  height: 100%;
  place-items: center;
  color: #198754;
  background: radial-gradient(circle at 72% 24%, rgba(255,255,255,.8), transparent 33%), linear-gradient(135deg, #e6f2e9, #dce9f0);
  font-size: 54px;
}

.online-activity-badge {
  position: absolute;
  z-index: 2;
  top: 14px;
  left: 14px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  max-width: calc(100% - 28px);
  padding: 7px 10px;
  color: #fff;
  background: rgba(17, 35, 48, .74);
  border: 1px solid rgba(255,255,255,.23);
  border-radius: 24px;
  font-size: 11px;
  font-weight: 700;
  backdrop-filter: blur(8px);
}

.online-activity-content {
  display: flex;
  flex: 1 1 auto;
  flex-direction: column;
  min-height: 0;
  padding: 18px 20px 17px;
}

.online-activity-eyebrow {
  margin-bottom: 5px;
  color: #198754;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .12em;
}

.online-activity-title {
  display: -webkit-box;
  min-height: 50px;
  overflow: hidden;
  margin: 0 0 8px;
  color: #142238;
  font-size: 19px;
  font-weight: 750;
  line-height: 1.32;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.online-activity-description {
  display: -webkit-box;
  min-height: 55px;
  overflow: hidden;
  margin: 0 0 12px;
  color: #6c7888;
  font-size: 13px;
  line-height: 1.45;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
}

.online-activity-details {
  display: flex;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 7px;
  min-height: 35px;
  margin-bottom: 13px;
}

.online-activity-details > span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 9px;
  color: #5b6878;
  background: #f3f7f4;
  border: 1px solid #e7eee9;
  border-radius: 8px;
  font-size: 11px;
  line-height: 1.2;
}

.online-activity-details i { color: #198754; }
.online-activity-details strong { color: #26364a; font-size: 12px; }
.online-activity-details .online-activity-capacity { color: #8a6512; background: #fff8e6; border-color: #f4e8c5; }
.online-activity-details .online-activity-capacity.is-open { color: #257247; background: #eef7f0; border-color: #dceee1; }

.online-activity-action {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  min-height: 46px;
  margin-top: auto;
  padding: 11px 14px;
  color: #fff;
  background: #198754;
  border: 1px solid #198754;
  border-radius: 9px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 750;
  text-align: left;
  transition: background .2s ease, border-color .2s ease;
}

.online-activity-action:hover { color: #fff; background: #146c43; border-color: #146c43; }
.online-activity-action i { transition: transform .2s ease; }
.online-activity-action:hover i { transform: translateX(3px); }
.online-activity-action:focus-visible { outline: 3px solid rgba(25, 135, 84, .3); outline-offset: 3px; }

.online-activity-unavailable {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 46px;
  margin-top: auto;
  padding: 10px 12px;
  color: #697586;
  background: #f5f7f8;
  border: 1px solid #e7ebee;
  border-radius: 9px;
  font-size: 12px;
}

.online-activity-unavailable i { color: #8792a0; }

@media (max-width: 767px) {
  .online-activity-card { height: 510px; }
  .online-activity-visual { flex-basis: 205px; height: 205px; }
  .online-activity-content { padding: 17px 17px 16px; }
  .online-activity-title { font-size: 18px; }
}

@media (max-width: 380px) {
  .online-activity-card { height: 530px; }
}

@media (prefers-reduced-motion: reduce) {
  .online-activity-card,
  .online-activity-visual > img,
  .online-activity-action,
  .online-activity-action i { transition: none; }
}