.activity {
  padding-top: calc(var(--header-height) + var(--spacing-xl));
  padding-bottom: var(--spacing-2xl);
  min-height: calc(100vh - var(--header-height) - 200px);
}

.page-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.page-title {
  text-align: center;
  font-size: var(--font-size-2xl);
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.page-subtitle {
  text-align: center;
  font-size: var(--font-size-base);
  color: var(--color-gray-700);
  margin-bottom: var(--spacing-md);
}

.activity-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: var(--spacing-lg);
  grid-auto-rows: auto auto 1fr auto;
}

.activity-card {
  background: var(--color-white);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  cursor: pointer;
  display: grid;
  grid-template-rows: subgrid;
  grid-row: span 4;
  gap: var(--spacing-md);
}

.activity-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.activity-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-sm);
}

.activity-card-date {
  font-size: var(--font-size-sm);
  color: var(--color-gray-600);
  font-weight: 500;
}

.activity-card-badge {
  display: inline-block;
  padding: 4px 12px;
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--border-radius-full);
  font-size: var(--font-size-xs);
  font-weight: 600;
}

.activity-card-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-gray-900);
  line-height: 1.4;
  margin: 0;
}

.activity-card-excerpt {
  font-size: var(--font-size-sm);
  color: var(--color-gray-600);
  line-height: 1.6;
}

.activity-card-button {
  padding: var(--spacing-sm) var(--spacing-lg);
  background: var(--color-white);
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
  border-radius: var(--border-radius-md);
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  width: fit-content;
}

.activity-card-button:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

.activity-dialog {
  max-width: 800px;
  width: 90%;
  border: none;
  border-radius: var(--border-radius-lg);
  padding: 0;
  margin-inline: auto;
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.2);
}

.activity-dialog::backdrop {
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
}

.activity-dialog-content {
  display: flex;
  flex-direction: column;
}

.activity-dialog-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-lg) var(--spacing-xl);
  border-bottom: 1px solid var(--color-gray-200);
  gap: var(--spacing-md);
}

.activity-dialog-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-gray-900);
  margin: 0;
  flex: 1;
  line-height: 1.4;
}

.activity-dialog-close {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: var(--color-gray-100);
  color: var(--color-gray-600);
  border-radius: var(--border-radius-full);
  font-size: 28px;
  cursor: pointer;
  transition: all 0.2s ease;
  flex-shrink: 0;
  line-height: 1;
}

.activity-dialog-close:hover {
  background: var(--color-gray-200);
  color: var(--color-gray-900);
}

.activity-dialog-body {
  padding: var(--spacing-xl);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.activity-dialog-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--color-gray-200);
}

.activity-dialog-meta time {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-primary);
}

.activity-dialog-meta time::before {
  content: "📅";
  font-size: 16px;
}

.activity-dialog-location {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-gray-700);
}

.activity-dialog-location::before {
  content: "📍";
  font-size: 16px;
}

.activity-dialog-text {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.activity-dialog-text h3 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-gray-900);
  margin: 0;
}

.activity-dialog-text p {
  font-size: var(--font-size-base);
  color: var(--color-gray-700);
  line-height: 1.8;
  margin: 0;
}

.activity-dialog-images {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.activity-dialog-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--border-radius-md);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.activity-dialog-image:hover {
  transform: scale(1.02);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

@media (width < 1024px) {
  .activity-grid {
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  }
}

@media (width < 768px) {
  .activity {
    padding-top: calc(var(--header-height) + var(--spacing-lg));
  }

  .activity-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .activity-card {
    padding: var(--spacing-md);
  }

  .activity-card-title {
    font-size: var(--font-size-base);
  }

  .activity-dialog {
    width: 95%;
  }

  .activity-dialog-header {
    padding: var(--spacing-md) var(--spacing-lg);
  }

  .activity-dialog-title {
    font-size: var(--font-size-lg);
  }

  .activity-dialog-body {
    padding: var(--spacing-lg);
  }

  .activity-dialog-meta {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .activity-dialog-images {
    grid-template-columns: 1fr;
  }
}