wp-calypso/client/my-sites/subscribers/components/subscriber-details/skeleton.scss

.subscriber-details {
	// ... existing styles ...

	&--is-placeholder {
		.subscriber-details__header {
			display: flex;
			align-items: center;
			margin-bottom: 24px;
		}

		.subscriber-details__info {
			margin-left: 16px;
		}

		.subscriber-details__name {
			margin-bottom: 8px;
		}

		.subscriber-details__meta {
			margin: 24px 0;

			.subscriber-details__meta-item {
				margin-bottom: 16px;

				&:last-child {
					margin-bottom: 0;
				}
			}
		}

		.subscriber-details__actions {
			margin-top: 24px;
		}
	}
}

.subscriber-details-skeleton {
	.subscriber-details-skeleton__header {
		display: flex;
		align-items: center;
		margin-bottom: 24px;
	}

	.subscriber-details-skeleton__title-group {
		margin-left: 16px;
		flex-grow: 1;
	}

	.subscriber-details-skeleton__stats {
		display: flex;
		gap: 24px;
		margin-bottom: 32px;
		padding: 16px 0;
		border-top: 1px solid var(--color-border-subtle);
		border-bottom: 1px solid var(--color-border-subtle);
	}

	.subscriber-details-skeleton__stat {
		display: flex;
		align-items: flex-start;
		gap: 8px;
		flex: 1;
	}

	.subscriber-details-skeleton__stat-text {
		display: flex;
		flex-direction: column;
		gap: 4px;
		flex-grow: 1;
	}

	.subscriber-details-skeleton__section {
		margin-bottom: 24px;

		&:last-child {
			margin-bottom: 0;
		}
	}

	.subscriber-details-skeleton__label {
		margin-bottom: 8px;
	}

	.subscriber-details-skeleton__footer {
		margin-top: 32px;
		padding-top: 16px;
		border-top: 1px solid var(--color-border-subtle);
	}

	.subscriber-details-skeleton__block {
		box-sizing: border-box;
		background-color: var(--studio-gray-5);
		animation: subscriber-details-skeleton-shimmer 1.5s infinite;
		border-radius: 4px;

		&--circle {
			border-radius: 50%;
		}
	}
}

@keyframes subscriber-details-skeleton-shimmer {
	0% {
		opacity: 1;
	}
	50% {
		opacity: 0.5;
	}
	100% {
		opacity: 1;
	}
}