/* journey.css — 実証の軌跡ページ専用スタイル
   共通レイアウトは inner.css（.inner / .section-* 系）に集約。
   ここには年表（タイムライン）と書籍一覧のみを記述する。 */

/* ===== 03-01 Timeline ===== */
.journey-timeline {
  margin-top: 28px;
  list-style: none;
  position: relative;
}

/* 年カラムの右に余白を取った位置に縦線を通す */
.journey-timeline::before {
  content: '';
  position: absolute;
  left: 100px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background-color: #ccc;
}

/* 1つの年（年ラベル＋複数イベント） */
.journey-year {
  position: relative;
  padding-left: 134px;
  padding-bottom: 28px;
}

.journey-year:last-child {
  padding-bottom: 0;
}

.journey-year-label {
  position: absolute;
  left: 0;
  top: 0;
  width: 88px;
}

.journey-year-label .hero-num {
  font-size: clamp(2rem, 3vw, 2.6rem);
  line-height: 1.2;
  color: var(--base-color);
}

.journey-events {
  list-style: none;
}

.journey-event {
  position: relative;
  font-size: 1.3rem;
  line-height: 1.8;
  color: var(--base-color);
}

.journey-event + .journey-event {
  margin-top: 18px;
}

/* 縦線上のドット */
.journey-event::before {
  content: '';
  position: absolute;
  left: -34px;
  top: 0.6em;
  width: 9px;
  height: 9px;
  background-color: #fff;
  border: 2px solid #999;
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.journey-timeline-note {
  margin-top: 20px;
  padding-left: 134px;
  font-size: 1.2rem;
  color: var(--sub-color);
  line-height: 1.7;
}

/* ===== 03-03 Books ===== */
.journey-books {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 32px;
}

.journey-book-item {
  display: flex;
  flex-direction: column;
}

.journey-book-cover {
  border-radius: 2px;
  box-shadow: 2px 4px 12px rgba(0, 0, 0, 0.15);
}

.journey-book-cover img {
  width: 100%;
  height: auto;
  display: block;
}

.journey-book-year {
  text-align: center;
  font-size: 1.3rem;
  font-weight: 700;
  margin-top: 14px;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .journey-books {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .journey-timeline::before {
    left: 80px;
  }

  .journey-year {
    padding-left: 108px;
  }

  .journey-year-label {
    width: 72px;
  }

  .journey-year-label .hero-num {
    font-size: 1.8rem;
  }

  .journey-event::before {
    left: -28px;
  }

  .journey-timeline-note {
    padding-left: 108px;
  }
}

@media (max-width: 480px) {
  .journey-timeline::before {
    display: none;
  }

  .journey-event::before {
    display: none;
  }

  .journey-year {
    padding-left: 0;
  }

  .journey-year-label {
    position: static;
    width: auto;
    margin-bottom: 8px;
  }

  .journey-timeline-note {
    padding-left: 0;
  }

  .journey-books {
    grid-template-columns: repeat(2, 1fr);
  }
}