* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* bodyのフォント指定を削除し、.musictribe-mainに限定 */
.musictribe-main {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: #333;
  background-color: #fff;
  min-height: 100vh;
  padding-top: 20px;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.hero-section {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  padding: 80px 0;
  margin-bottom: 40px;
}

.hero-content {
  text-align: center;
  color: white;
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 10px;
}

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

.page-nav {
  background: #f8f9fa;
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  margin-bottom: 40px;
}

.nav-list {
  display: flex;
  list-style: none;
  justify-content: center;
  flex-wrap: wrap;
}

.nav-link {
  display: block;
  padding: 15px 30px;
  color: #555;
  text-decoration: none;
  font-weight: 500;
  transition: all 0.3s;
  border-bottom: 3px solid transparent;
}

.nav-link:hover {
  background: #fff;
  color: #667eea;
}

.nav-link.active {
  background: #fff;
  color: #667eea;
  border-bottom-color: #667eea;
}

.musictribe-main .section-title {
  font-size: 2rem;
  color: #333;
  margin-bottom: 30px;
  padding-bottom: 10px;
  border-bottom: 3px solid #667eea;
  display: inline-block;
}

.content-block {
  margin-bottom: 40px;
}

.musictribe-main .content-block h3 {
  font-size: 1.5rem;
  color: #444;
  margin-bottom: 20px;
  margin-top: 30px;
}

.musictribe-main .content-block h4 {
  font-size: 1.2rem;
  color: #555;
  margin: 25px 0 15px;
  font-weight: 600;
}

.musictribe-main .content-block h5 {
  font-size: 1.1rem;
  color: #666;
  margin: 20px 0 10px;
  font-weight: 600;
}

.musictribe-main .content-block p {
  margin-bottom: 15px;
  line-height: 1.8;
}

.alert-box {
  background: #e8f4fd;
  border-left: 4px solid #2196F3;
  padding: 20px;
  margin: 20px 0;
  border-radius: 4px;
}

.alert-box.warning {
  background: #fff3cd;
  border-left-color: #ffc107;
}

.alert-box strong {
  color: #1976D2;
}

.alert-box.warning strong {
  color: #856404;
}

.product-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin: 30px 0;
}

.product-item {
  background: #f8f9fa;
  padding: 20px;
  border-radius: 8px;
  border: 1px solid #e0e0e0;
}

.product-item h4 {
  color: #667eea;
  margin-bottom: 10px;
  font-size: 1.3rem;
}

.product-item p {
  font-weight: 500;
  color: #555;
  margin-bottom: 10px;
}

.product-item ul {
  margin-left: 20px;
  color: #666;
}

.product-item li {
  margin: 5px 0;
}

.btn-primary {
  display: inline-block;
  background: #667eea;
  color: white;
  padding: 12px 30px;
  border-radius: 5px;
  text-decoration: none;
  font-weight: 500;
  transition: all 0.3s;
  margin: 20px 0;
}

.btn-primary:hover {
  background: #5a67d8;
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(102, 126, 234, 0.3);
}

.numbered-list {
  margin: 20px 0 20px 20px;
  line-height: 1.8;
}

.numbered-list li {
  margin: 10px 0;
  padding-left: 10px;
}

.warranty-detail {
  background: #f8f9fa;
  padding: 20px;
  border-radius: 8px;
  margin: 20px 0;
}

.warranty-detail ul {
  margin: 10px 0 20px 30px;
}

.warranty-detail li {
  margin: 5px 0;
}

.warning-text {
  color: #d32f2f;
  font-weight: 500;
  background: #ffebee;
  padding: 15px;
  border-radius: 4px;
  margin: 20px 0;
}

.repair-company {
  background: white;
  border: 2px solid #e0e0e0;
  border-radius: 8px;
  padding: 30px;
  margin: 30px 0;
}

.repair-company h3 {
  color: #667eea;
  margin-bottom: 20px;
}

.company-info h4 {
  font-size: 1.3rem;
  color: #333;
  margin-bottom: 15px;
}

.contact-list {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 10px;
  margin: 20px 0;
}

.contact-list dt {
  font-weight: 600;
  color: #555;
}

.contact-list dd {
  color: #333;
}

.contact-list a {
  color: #667eea;
  text-decoration: none;
}

.contact-list a:hover {
  text-decoration: underline;
}

.notice {
  background: #f0f4f8;
  padding: 15px;
  border-radius: 4px;
  margin-top: 20px;
  font-size: 0.95rem;
  color: #666;
}

/* セクションごとのマージン調整 */
.support-section,
.warranty-section,
.out-warranty-section {
  padding: 40px 0;
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 1.8rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .nav-list {
    flex-direction: column;
  }

  .nav-link {
    padding: 12px 20px;
  }

  .product-list {
    grid-template-columns: 1fr;
  }

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

  .contact-list dt {
    margin-top: 10px;
  }

  .musictribe-main .section-title {
    font-size: 1.5rem;
  }
}