/* 评论框装饰 — 企鹅背景 + 聚焦滑走效果 */
textarea#comment {
    background-color: transparent;
    background: linear-gradient(rgba(0,0,0,.05), rgba(0,0,0,.05)),
                var(--zm-comment-penguin, none) right 10px bottom 10px no-repeat;
    transition: background-position-y .45s ease-in-out;
}
textarea#comment:focus {
    background-position-y: 789px;
    transition: background-position-y .45s ease-in-out;
}