/* ============================================
   経済クラブとはページ スタイル
   ============================================ */

/* --- Section 1: 歴史・歩み --- */
.about-history-section {
  background-color: var(--color-white);
}

.about-history {
  display: flex;
  gap: 56px;
  align-items: center;
  max-width: 1000px;
  margin: 0 auto;
}

.about-history-image {
  flex: 0 0 420px;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  position: relative;
}

.about-history-image img {
  width: 100%;
  height: auto;
  display: block;
}

.about-history-body {
  flex: 1;
  min-width: 0;
}

.about-history-badge {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 20px;
  padding: 12px 24px;
  border: 2px solid var(--color-primary);
  border-radius: 12px;
}

.about-history-since {
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.15em;
}

.about-history-year {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.1;
  letter-spacing: 0.05em;
}

.about-history-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 20px;
  line-height: 1.4;
}

.about-history-body p {
  font-size: 0.9375rem;
  line-height: 2.2;
  color: var(--color-text);
  margin-bottom: 16px;
}

.about-history-body p:last-child {
  margin-bottom: 0;
}

/* --- Section 2: 5つのポイント --- */
.about-points-section {
  background-color: var(--color-bg-light);
}

.about-points {
  display: flex;
  flex-direction: column;
  gap: 56px;
  margin-top: 56px;
}

.about-point {
  display: flex;
  gap: 48px;
  align-items: center;
  max-width: 960px;
  margin: 0 auto;
  width: 100%;
}

.about-point.about-point-reverse {
  flex-direction: row-reverse;
}

.about-point-image {
  flex: 0 0 400px;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.about-point-image:hover {
  transform: scale(1.02);
}

.about-point-image img {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.about-point-body {
  flex: 1;
  min-width: 0;
}

.about-point-number {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 8px;
  padding: 4px 14px;
  background: var(--color-primary-light);
  border-radius: 100px;
}

.about-point-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 12px;
  line-height: 1.5;
}

.about-point-text {
  font-size: 0.9375rem;
  line-height: 2;
  color: var(--color-text-light);
}

/* --- Section 3: チャート --- */
.about-chart-section {
  background-color: var(--color-white);
}

.about-chart {
  margin-top: 40px;
  text-align: center;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  background: var(--color-white);
}

.about-chart img {
  width: 100%;
  height: auto;
  display: block;
}

/* --- Section 4: 活動と実績 --- */
.about-activity-section {
  background-color: var(--color-bg-light);
}

/* 活動カードグリッド */
.activity-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-top: 8px;
}

.activity-card {
  background: var(--color-white);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.4s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.activity-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-6px);
}

.activity-card-image {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
}

.activity-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.6s ease;
}

.activity-card:hover .activity-card-image img {
  transform: scale(1.05);
}

.activity-card-freq {
  position: absolute;
  top: 12px;
  left: 12px;
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--color-white);
  background: var(--color-primary);
  padding: 4px 14px;
  border-radius: 4px;
  letter-spacing: 0.04em;
}

.activity-card-body {
  padding: 20px 24px 28px;
}

.activity-card-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 10px;
  line-height: 1.5;
}

.activity-card-text {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  line-height: 1.9;
}

/* 近年の講師 */
.activity-speakers {
  margin-top: 56px;
  padding: 36px 40px;
  background: var(--color-white);
  border-radius: 16px;
  box-shadow: var(--shadow-sm);
}

.activity-speakers-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-primary);
}

.activity-speakers-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.activity-speakers-list span {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text);
  padding: 6px 16px;
  background: var(--color-bg-light);
  border-radius: 100px;
  white-space: nowrap;
}

.activity-speakers-note {
  margin-top: 16px;
  font-size: 0.75rem;
  color: var(--color-text-light);
}

/* 実績タイムライン */
.activity-timeline {
  margin-top: 56px;
}

.activity-timeline-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 32px;
  text-align: center;
}

.activity-timeline-title::after {
  content: "";
  display: block;
  width: 40px;
  height: 3px;
  background: var(--color-primary);
  margin: 12px auto 0;
  border-radius: 2px;
}

.activity-timeline-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
  padding-left: 160px;
}

/* 縦ライン */
.activity-timeline-list::before {
  content: "";
  position: absolute;
  left: 145px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(to bottom, var(--color-primary) 0%, rgba(180, 59, 59, 0.15) 100%);
  border-radius: 2px;
}

.activity-timeline-item {
  position: relative;
  padding: 0 0 40px 32px;
}

.activity-timeline-item:last-child {
  padding-bottom: 0;
}

/* ドット */
.activity-timeline-item::before {
  content: "";
  position: absolute;
  left: -21px;
  top: 20px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-white);
  border: 3px solid var(--color-primary);
  z-index: 1;
}

.activity-timeline-date {
  position: absolute;
  left: -155px;
  top: 16px;
  width: 110px;
  text-align: right;
}

.activity-timeline-year {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.02em;
}

.activity-timeline-content {
  display: flex;
  gap: 20px;
  background: var(--color-white);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.3s, transform 0.3s;
}

.activity-timeline-content:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.activity-timeline-image {
  flex: 0 0 160px;
  aspect-ratio: 1 / 1;
  overflow: hidden;
}

.activity-timeline-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.activity-timeline-body {
  flex: 1;
  padding: 20px 24px 20px 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.activity-timeline-body h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 8px;
  line-height: 1.5;
}

.activity-timeline-body p {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  line-height: 1.8;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .about-history {
    gap: 40px;
  }

  .about-history-image {
    flex: 0 0 340px;
  }

  .about-point {
    gap: 36px;
  }

  .about-point-image {
    flex: 0 0 320px;
  }

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

@media (max-width: 768px) {
  /* Section 1 */
  .about-history {
    flex-direction: column;
    gap: 32px;
  }

  .about-history-image {
    flex: none;
    width: 100%;
  }

  .about-history-title {
    font-size: 1.25rem;
  }

  /* Section 2 */
  .about-points {
    gap: 40px;
    margin-top: 40px;
  }

  .about-point,
  .about-point.about-point-reverse {
    flex-direction: column;
    gap: 20px;
  }

  .about-point-image {
    flex: none;
    width: 100%;
  }

  .about-point-title {
    font-size: 1.0625rem;
  }

  /* Section 3 */
  .about-chart {
    border-radius: 12px;
  }

  /* Section 4 */
  .activity-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .activity-speakers {
    padding: 24px 20px;
  }

  .activity-speakers-list span {
    font-size: 0.75rem;
    padding: 5px 12px;
  }

  /* タイムライン */
  .activity-timeline-list {
    padding-left: 0;
  }

  .activity-timeline-list::before {
    left: 16px;
  }

  .activity-timeline-item {
    padding-left: 48px;
  }

  .activity-timeline-item::before {
    left: 10px;
  }

  .activity-timeline-date {
    position: static;
    width: auto;
    text-align: left;
    margin-bottom: 8px;
  }

  .activity-timeline-content {
    flex-direction: row;
  }

  .activity-timeline-image {
    flex: 0 0 100px;
    aspect-ratio: 1 / 1;
    height: auto;
  }

  .activity-timeline-image img {
    min-height: 100%;
  }

  .activity-timeline-body {
    padding: 12px 16px 12px 0;
  }

  .activity-timeline-body h4 {
    font-size: 0.875rem;
    margin-bottom: 4px;
  }

  .activity-timeline-body p {
    font-size: 0.75rem;
    line-height: 1.6;
  }
}