/* about.css - レスポンシブ対応版 */

/* ========================================
   基本スタイル
   ======================================== */

.about_infos {
  border-radius: 1rem;
}

.about_year {
  border-radius: 4rem;
  width: 4rem;
  height: 4rem;
  flex-shrink: 0;
}

.about_history {
  margin: 1.5rem 0;
}

.about_month {
  color: #7d7d7d;
  font-size: 0.9rem;
  font-weight: bold;
  margin-bottom: 0.5rem;
}

.about_greeting {
  padding: 3rem 4rem;
}

.about_greeting_right {
  background-color: #e6ecfb;
  padding: 3rem 4rem;
}

.about_check {
  width: 2rem;
  height: 2rem;
  border-radius: 2rem;
}

.chart {
  width: 100%;
  height: auto;
}

/* ========================================
   ページ内ナビゲーション のレスポンシブ対応
   ======================================== */

.page-nav {
  position: sticky;
  top: 0;
  z-index: 40;
  background: white;
  border-bottom: 1px solid #e5e7eb;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.page-nav-container {
  display: flex;
  overflow-x: auto;
  padding: 1rem 0;
  gap: 0.75rem;
}

.nav-btn {
  white-space: nowrap;
  padding: 0.5rem 1.5rem;
  border-radius: 9999px;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
}

@media (max-width: 768px) {
  .page-nav-container {
    gap: 0.5rem;
    padding: 0.75rem 0;
  }

  .nav-btn {
    padding: 0.4rem 1rem;
    font-size: 0.8rem;
  }

  .nav-btn i {
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  .nav-btn {
    padding: 0.35rem 0.875rem;
    font-size: 0.75rem;
  }
}

/* ========================================
   協会概要セクション のレスポンシブ対応
   ======================================== */

.overview-section {
  padding: 5rem 0;
}

.overview-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4rem;
  align-items: start;
}

.about_info {
  display: flex;
  justify-content: space-between;
  padding: 0.75rem 0;
  border-bottom: 1px solid #e5e7eb;
}

@media (max-width: 1024px) {
  .overview-section {
    padding: 4rem 0;
  }

  .overview-grid {
    gap: 3rem;
  }
}

@media (max-width: 768px) {
  .overview-section {
    padding: 3rem 0;
  }

  .overview-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .about_info {
    flex-direction: column;
    gap: 0.5rem;
    padding: 0.625rem 0;
  }

  .about_info span:first-child {
    font-size: 0.9rem;
  }

  .about_info span:last-child {
    font-size: 0.875rem;
    text-align: left;
  }
}

@media (max-width: 480px) {
  .overview-section {
    padding: 2rem 0;
  }

  .about_info {
    padding: 0.5rem 0;
  }

  .about_info span:first-child {
    font-size: 0.85rem;
  }

  .about_info span:last-child {
    font-size: 0.8rem;
  }
}

/* ========================================
   会長挨拶セクション のレスポンシブ対応
   ======================================== */

.president-section {
  padding: 5rem 0;
}

.about_greetings {
  background: white;
  border-radius: 0.5rem;
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  overflow: hidden;
}

.greeting-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
}

@media (max-width: 1024px) {
  .president-section {
    padding: 4rem 0;
  }

  .about_greeting {
    padding: 2.5rem 3rem;
  }

  .about_greeting_right {
    padding: 2.5rem 3rem;
  }
}

@media (max-width: 768px) {
  .president-section {
    padding: 3rem 0;
  }

  .greeting-grid {
    grid-template-columns: 1fr;
  }

  .about_greeting {
    padding: 2rem;
  }

  .about_greeting_right {
    padding: 2rem;
  }

  .about_check {
    width: 1.75rem;
    height: 1.75rem;
  }
}

@media (max-width: 480px) {
  .president-section {
    padding: 2rem 0;
  }

  .about_greeting {
    padding: 1.5rem;
    font-size: 0.9rem;
  }

  .about_greeting_right {
    padding: 1.5rem;
  }

  .about_check {
    width: 1.5rem;
    height: 1.5rem;
  }

  .about_greeting p {
    font-size: 0.875rem;
    line-height: 1.6;
  }
}

/* ========================================
   事業内容セクション のレスポンシブ対応
   ======================================== */

.business-section {
  padding: 5rem 0;
}

.business-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 2rem;
}

@media (max-width: 1024px) {
  .business-section {
    padding: 4rem 0;
  }

  .business-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.5rem;
  }
}

@media (max-width: 768px) {
  .business-section {
    padding: 3rem 0;
  }

  .business-grid {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
}

@media (max-width: 480px) {
  .business-section {
    padding: 2rem 0;
  }

  .business-grid {
    gap: 1rem;
  }
}

/* ========================================
   アクセス情報セクション のレスポンシブ対応
   ======================================== */

.access-section {
  padding: 5rem 0;
}

.access-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4rem;
}

@media (max-width: 1024px) {
  .access-section {
    padding: 4rem 0;
  }

  .access-grid {
    gap: 3rem;
  }
}

@media (max-width: 768px) {
  .access-section {
    padding: 3rem 0;
  }

  .access-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

@media (max-width: 480px) {
  .access-section {
    padding: 2rem 0;
  }
}

/* ========================================
   組織構成セクション のレスポンシブ対応
   ======================================== */

.organization-section {
  padding: 5rem 0;
}

.organization-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4rem;
}

.chart {
  width: 100%;
  height: auto;
  object-fit: contain;
  border-radius: 0.75rem;
}

@media (max-width: 1024px) {
  .organization-section {
    padding: 4rem 0;
  }

  .organization-grid {
    gap: 3rem;
  }
}

@media (max-width: 768px) {
  .organization-section {
    padding: 3rem 0;
  }

  .organization-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
}

@media (max-width: 480px) {
  .organization-section {
    padding: 2rem 0;
  }

  .organization-grid {
    gap: 2rem;
  }
}

/* ========================================
   沿革セクション のレスポンシブ対応
   ======================================== */

.history-section {
  padding: 5rem 0;
}

.history-item {
  display: flex;
  align-items: center;
  gap: 2rem;
  margin-bottom: 3rem;
}

.about_year {
  font-size: 1.125rem;
}

@media (max-width: 1024px) {
  .history-section {
    padding: 4rem 0;
  }

  .history-item {
    gap: 1.5rem;
  }
}

@media (max-width: 768px) {
  .history-section {
    padding: 3rem 0;
  }

  .history-item {
    gap: 1.25rem;
    margin-bottom: 2.5rem;
  }

  .about_year {
    width: 3.5rem;
    height: 3.5rem;
    font-size: 1rem;
  }

  .about_history {
    padding: 1.5rem;
  }

  .about_history h3 {
    font-size: 1.125rem;
  }

  .about_history p {
    font-size: 0.9rem;
  }
}

@media (max-width: 480px) {
  .history-section {
    padding: 2rem 0;
  }

  .history-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 2rem;
  }

  .about_year {
    width: 3rem;
    height: 3rem;
    font-size: 0.9rem;
  }

  .about_history {
    padding: 1.25rem;
    width: 100%;
  }

  .about_month {
    font-size: 0.8rem;
  }

  .about_history h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
  }

  .about_history p {
    font-size: 0.85rem;
    line-height: 1.6;
  }
}

/* ========================================
   セクション共通スタイル のレスポンシブ対応
   ======================================== */

.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.section-description {
  font-size: 1.25rem;
  color: #4b5563;
}

@media (max-width: 768px) {
  .section-title {
    font-size: 1.875rem;
  }

  .section-description {
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  .section-title {
    font-size: 1.5rem;
  }

  .section-description {
    font-size: 0.9rem;
  }
}