.about-main {
  padding-top: 80px;
  min-height: 100vh;
}

/* ヒーローセクション */
.about-hero {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
  color: white;
  padding: 4rem var(--mobile-padding);
  text-align: center;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
}

.hero-subtitle {
  font-size: 1.2rem;
  opacity: 0.9;
  line-height: 1.6;
}

/* 新しいセクション用のスタイル */
.purpose-section {
  padding: 80px 0;
  background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.purpose-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.welcome-message {
  margin-bottom: 2rem;
}

.welcome-text {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: 1rem;
}

.purpose-text p {
  font-size: 1.1rem;
  line-height: 1.8;
  margin-bottom: 1.5rem;
  color: #495057;
}

.closing-message {
  font-size: 1.2rem !important;
  font-weight: 500;
  color: var(--primary-color) !important;
  margin-top: 2rem !important;
}

.activities-section {
  padding: 80px 0;
  background: #fff;
}

.section-subtitle {
  text-align: center;
  font-size: 1.1rem;
  color: #6c757d;
  margin-bottom: 3rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.activities-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.activity-card {
  background: #fff;
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  border: 1px solid #e9ecef;
}

.activity-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
}

.activity-icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--accent-color), #45a049);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
}

.activity-icon i {
  font-size: 1.5rem;
  color: white;
}

.activity-card h3 {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: 1rem;
}

.activity-card p {
  color: #6c757d;
  line-height: 1.6;
}

.organization-section {
  padding: 80px 0;
  background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.organization-content {
  max-width: 800px;
  margin: 0 auto;
}

.organization-text {
  text-align: center;
  margin-bottom: 3rem;
}

.organization-text p {
  font-size: 1.1rem;
  line-height: 1.8;
  color: #495057;
  margin-bottom: 1.5rem;
}

.event-announcement {
  background: #fff;
  border-radius: 12px;
  padding: 2.5rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  border-left: 4px solid var(--accent-color);
}

.event-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.event-header i {
  font-size: 1.5rem;
  color: var(--accent-color);
}

.event-header h3 {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--primary-color);
  margin: 0;
}

.event-details p {
  color: #6c757d;
  line-height: 1.6;
  margin-bottom: 1rem;
}

.event-cta {
  text-align: center;
  margin-top: 2rem;
}

.event-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 12px 24px;
  background: var(--accent-color);
  color: white;
  text-decoration: none;
  border-radius: 8px;
  font-weight: 500;
  transition: background-color 0.3s ease;
}

.event-btn:hover {
  background: #45a049;
  color: white;
  text-decoration: none;
}

.future-section {
  padding: 80px 0;
  background: #fff;
}

.future-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.future-text p {
  font-size: 1.1rem;
  line-height: 1.8;
  color: #495057;
  margin-bottom: 1.5rem;
}

.action-circle {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  max-width: 300px;
  margin: 0 auto;
}

.circle-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 1.5rem;
  background: linear-gradient(135deg, #f8f9fa, #e9ecef);
  border-radius: 12px;
  transition: transform 0.3s ease;
}

.circle-item:hover {
  transform: scale(1.05);
}

.circle-item i {
  font-size: 2rem;
  color: var(--accent-color);
}

.circle-item span {
  font-weight: 500;
  color: var(--primary-color);
}

/* セクション共通 */
.contact-section {
  padding: 4rem 0;
  background: var(--surface);
}

/* お問い合わせ */
.contact-content {
  display: grid;
  gap: 3rem;
}

.contact-info {
  display: grid;
  gap: 1.5rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  background: var(--background);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
}

.contact-item i {
  width: 50px;
  height: 50px;
  background: var(--accent-color);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.contact-item h3 {
  color: var(--primary-color);
  margin-bottom: 0.25rem;
}

.contact-item p {
  color: var(--text-secondary);
  margin: 0;
}

.contact-form {
  background: var(--background);
  padding: 2rem;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
}

/* フッター */
.footer {
  background: var(--text-primary);
  color: white;
  padding: 3rem 0 1rem;
}

.footer-content {
  display: grid;
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-section h3,
.footer-section h4 {
  margin-bottom: 1rem;
  color: var(--accent-color);
}

.footer-section ul {
  list-style: none;
}

.footer-section ul li {
  margin-bottom: 0.5rem;
}

.footer-section a {
  color: white;
  text-decoration: none;
  transition: var(--transition);
}

.footer-section a:hover {
  color: var(--accent-color);
}

.social-links {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

.social-links a {
  width: 40px;
  height: 40px;
  background: var(--accent-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.social-links a:hover {
  transform: translateY(-2px);
  background: var(--primary-color);
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  opacity: 0.7;
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
  .hero-title {
    font-size: 2rem;
  }

  .activities-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

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

  .event-announcement {
    padding: 1.5rem;
  }

  .event-header {
    flex-direction: column;
    text-align: center;
    gap: 0.5rem;
  }

  .purpose-text p,
  .organization-text p,
  .future-text p {
    font-size: 1rem;
  }

  .welcome-text {
    font-size: 1.2rem;
  }

  .closing-message {
    font-size: 1.1rem !important;
  }

  .contact-content {
    grid-template-columns: 1fr;
  }

  .footer-content {
    grid-template-columns: 1fr;
  }
}

/* タブレット以上 */
@media (min-width: 768px) {
  .hero-title {
    font-size: 3rem;
  }

  .contact-content {
    grid-template-columns: 1fr 1fr;
  }

  .footer-content {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* デスクトップ */
@media (min-width: 1024px) {
  .activities-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}