.sec-container {
  text-align: left;
}

.concept-main-container {
  width: 100%;
  max-width: 900px;
  margin: 0 auto 60px;
}

.concept-intro-box {
  background-color: rgba(0, 0, 0, 0.5);
  padding: 30px;
  margin-bottom: 40px;
  border-radius: 5px;
}

.concept-intro-text {
  font-size: 1.2rem;
  line-height: 1.8;
  margin: 0;
  font-weight: 500;
}

.concept-section-container {
  display: flex;
  flex-direction: column;
  gap: 30px;
}

.concept-section-item {
  background-color: rgba(0, 0, 0, 0.5);
  border-radius: 5px;
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.concept-section-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
}

.concept-section-title {
  background-color: rgba(255, 255, 255, 0.1);
  margin: 0;
  padding: 20px;
  font-size: 1.3rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  font-weight: 500;
}

.concept-section-content {
  padding: 25px;
}

.concept-image-wrapper {
  width: 100%;
  height: 240px;
  margin-bottom: 20px;
  overflow: hidden;
  border-radius: 4px;
  position: relative;
}

.concept-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
  filter: brightness(0.9);
}

.concept-section-item:hover .concept-image {
  transform: scale(1.05);
  filter: brightness(1);
}

.concept-section-text {
  line-height: 1.8;
  margin: 0;
  font-size: 1rem;
}

.concept-section-item {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease, box-shadow 0.3s ease;
}

.concept-section-item.visible {
  opacity: 1;
  transform: translateY(0);
}

.concept-btn-more {
  text-align: right;
  margin-top: 20px;
}

.concept-btn-more a {
  display: inline-block;
  color: #fff;
  text-decoration: none;
  padding: 16px 35px 16px 20px;
  background-color: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 4px;
  transition: all 0.3s ease;
  position: relative;
}

.concept-btn-more a::after {
  content: "";
  position: absolute;
  top: 52%;
  right: 20px;
  width: 6px;
  height: 6px;
  border-top: 2px solid #fff;
  border-right: 2px solid #fff;
  transform: translateY(-50%) rotate(45deg);
  transition: right 0.3s ease;
}

.concept-btn-more a:hover {
  background-color: rgba(255, 255, 255, 0.2);
}

.concept-btn-more a:hover::after {
  right: 15px;
}

@media screen and (max-width: 991px) {
}

@media screen and (max-width: 768px) {
  /* 古いconcept */
  .concept-area-container {
    padding: 0 12px;
  }
  /* 古いconcept */

  .concept-intro-box {
    padding: 20px;
  }

  .concept-intro-text {
    font-size: 1.1rem;
  }

  .concept-section-title {
    padding: 15px;
    font-size: 1.2rem;
  }

  .concept-section-content {
    padding: 20px;
  }

  .concept-section-text {
    font-size: 0.95rem;
  }

  .concept-image-wrapper {
    height: 200px;
  }
}

@media screen and (max-width: 479px) {
  /* concept */
  .concept-intro-box {
    padding: 15px;
  }

  .concept-intro-text {
    font-size: 1rem;
  }

  .concept-section-container {
    gap: 20px;
  }

  .concept-section-title {
    padding: 12px;
    font-size: 1.1rem;
  }

  .concept-section-content {
    padding: 15px;
  }

  .concept-section-text {
    font-size: 0.9rem;
  }

  .concept-image-wrapper {
    height: 160px;
    margin-bottom: 15px;
  }
}

@media screen and (max-width: 376px) {
}