/**
 * 沿革（年表）ブロック — フロント／エディター共通
 */
.tcf-history-timeline {
  --tcf-hist-line: var(--tbt-enzhi, #7f2629);
  --tcf-hist-year: var(--tbt-enzhi, #7f2629);
  --tcf-hist-title: var(--tbt-shouzumi, #3f3f3f);
  --tcf-hist-body: var(--tbt-shouzumi, #3f3f3f);
  /* ドットと縦線の位置計算用（リストと値を揃える） */
  --tcf-hist-line-w: 3px;
  --tcf-hist-pad-left: 1.35rem;
  font-family: var(--tbt-font-body, "Noto Sans JP", sans-serif);
  box-sizing: border-box;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  /* 和紙背景上でも読みやすい薄いベース */
  padding: 1.35rem 1.5rem 1.5rem;
  border-radius: 10px;
  background: rgba(255, 252, 247, 0.88);
  box-shadow: inset 0 0 0 1px rgba(127, 38, 41, 0.06);
}

.tcf-history-timeline__empty,
.tcf-history-timeline-editor .tcf-history-timeline__empty {
  margin: 0;
  padding: 1rem 1.25rem;
  color: var(--tcf-hist-body);
  font-size: 1.05rem;
  border: 1px dashed rgba(127, 38, 41, 0.35);
  border-radius: 6px;
  background: rgba(248, 244, 237, 0.6);
}

.tcf-history-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 var(--tcf-hist-pad-left);
  position: relative;
  border-left: var(--tcf-hist-line-w) solid var(--tcf-hist-line);
}

.tcf-history-timeline__item {
  position: relative;
  margin: 0 0 1.75rem;
  padding: 0;
}

.tcf-history-timeline__item:last-child {
  margin-bottom: 0;
}

.tcf-history-timeline__dot {
  position: absolute;
  /* li の左端（リストのコンテンツ左端）から、縦線の中心まで戻す */
  left: calc(-1 * var(--tcf-hist-pad-left) - var(--tcf-hist-line-w) / 2);
  top: 0.4em;
  width: 12px;
  height: 12px;
  margin: 0;
  border-radius: 50%;
  background: var(--tcf-hist-line);
  transform: translateX(-50%);
  box-shadow: 0 0 0 3px rgba(255, 252, 247, 0.95);
}

.tcf-history-timeline__content {
  padding-left: 0.35rem;
}

.tcf-history-timeline__year {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--tcf-hist-year);
}

.tcf-history-timeline__title {
  margin: 0 0 0.55rem;
  font-size: 1.3rem;
  font-weight: 600;
  font-family: var(--tbt-font-heading, var(--tbt-font-serif, "Shippori Mincho", serif));
  color: var(--tcf-hist-title);
  line-height: 1.45;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.tcf-history-timeline__body {
  margin: 0;
  font-size: 1.08rem;
  line-height: 1.8;
  color: var(--tcf-hist-body);
}

.tcf-history-timeline__body p {
  margin: 0 0 0.65em;
}

.tcf-history-timeline__body p:last-child {
  margin-bottom: 0;
}

/* エディター内フォーム */
.tcf-history-timeline-editor {
  padding: 1rem;
  background: var(--tbt-washi-cream, #f8f4ed);
  border: 1px solid rgba(63, 63, 63, 0.12);
  border-radius: 8px;
}

.tcf-history-timeline-editor__row {
  margin-bottom: 1.25rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid rgba(63, 63, 63, 0.1);
}

.tcf-history-timeline-editor__row:last-of-type {
  border-bottom: none;
  margin-bottom: 1rem;
  padding-bottom: 0;
}

.tcf-history-timeline-editor__row-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 0.75rem;
}

@media (max-width: 781px) {
  .tcf-history-timeline {
    --tcf-hist-pad-left: 1.1rem;
    padding: 1.05rem clamp(0.72rem, 3.2vw, 1rem) 1.15rem;
  }

  .tcf-history-timeline__content {
    padding-left: 0.25rem;
    min-width: 0;
  }

  .tcf-history-timeline__body {
    overflow-wrap: anywhere;
    word-break: break-word;
  }
}