/* シリーズの目次（色はテーマの変数。yozora 以外のテーマでは括弧内の色） */
.yb-series { margin: 2em 0; padding: 14px 16px; border: 1px solid var(--c-line, #e3e6eb); border-radius: var(--radius, 8px); background: var(--c-bg-soft, #f5f6f8); font-size: .9rem; line-height: 1.7; }
.yb-series__head { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 10px; margin: 0 0 8px; }
.yb-series__label { padding: 0 .6em; border-radius: 3px; background: var(--c-accent, #2a5ba8); color: var(--c-on-accent, #fff); font-size: .72rem; font-weight: 700; letter-spacing: .08em; }
.yb-series__name { font-weight: 700; color: var(--c-heading, inherit); text-decoration: none; }
.yb-series__count { font-size: .78rem; color: var(--c-sub, #5c6474); }
.yb-series__more summary { cursor: pointer; font-size: .82rem; color: var(--c-sub, #5c6474); }
.yb-series__list { margin: 6px 0 0; padding-left: 1.6em; }
.yb-series__list li { margin-block: 2px; }
.yb-series__list a { color: inherit; }
.yb-series__list .is-current { font-weight: 700; color: var(--c-accent, #2a5ba8); }
.yb-series__nav { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 12px; }
.yb-series__nav a { display: block; padding: 8px 10px; border: 1px solid var(--c-line, #e3e6eb); border-radius: 6px; background: var(--c-bg, #fff); color: inherit; font-size: .82rem; line-height: 1.5; text-decoration: none; }
.yb-series__nav a span { display: block; font-size: .7rem; color: var(--c-sub, #5c6474); }
.yb-series__next { text-align: right; grid-column: 2; }
.entry-content .yb-series__nav a, .entry-content .yb-series__name { text-decoration: none; }