:root {
    --category-bg-color: #e2005e;
    --tag-bg-color: #00a6df;
}

.article-tags a {
    display: inline-block;
    height: 24px;
    line-height: 23px;
    position: relative;
    margin: 0 16px 4px 0;
    padding: 0 16px 0 6px;
    background: var(--tag-bg-color);
    border-bottom-left-radius: 5px;
    border-top-left-radius: 5px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
    color: #fff;
    font-size: 12px;
    text-decoration: none;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

.article-tags a::before {
    content: "";
    position: absolute;
    top: 10px;
    right: 1px;
    float: left;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: #fff;
    box-shadow: -1px -1px 2px rgba(0, 0, 0, 0.4);
}

.article-tags a::after {
    content: "";
    position: absolute;
    top: 0;
    right: -12px;
    width: 0;
    height: 0;
    border-color: transparent transparent transparent var(--tag-bg-color);
    border-style: solid;
    border-width: 12px 0 12px 12px;
}

.article-tags a:hover {
    /* 斜めに傾ける */
    transform: rotate(-5deg);
    filter: brightness(0.8);
}

/* カテゴリタグ */
.article-tags a.category {
    background: var(--category-bg-color);
}

.article-tags a.category::after {
    border-color: transparent transparent transparent var(--category-bg-color);
}

.article-tags a.category:hover {
    filter: brightness(0.8);
}