.concept {
  padding: 140px 8% 160px;
}

.concept-title {
  text-align: center;
  transform: translateY(-70px);
}

.concept-title h1 {
  font-size: 42px;
  font-weight: 400;
  letter-spacing: 0.08em;
}
/* CONCEPT 01 / 02 / 03 */

.concept-item {
  display: grid;
  grid-template-columns: 10% 45% 45%;
  padding: 60px 0;
  border-top: none;
  position: relative;
}
.concept-item::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 65px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #999;
}
.concept-item::before {
  transition: transform 0.4s ease;
}

.concept-item.is-active::before {
  transform: scale(3);
}

.concept-number {
  font-size: 48px;
  font-weight: 300;
  line-height: 1;
}

.concept-text {
  padding-top: 0;
  transform: translateY(0);
}

.concept-en {
  font-size: 11px;
  letter-spacing: 0.2em;
  margin-bottom: 16px;
}

.concept-text h2 {
  font-size: 30px;
  font-weight: 400;
  letter-spacing: 0.08em;
  line-height: 1.7;
  margin-bottom: 20px;
}

.concept-text > p:last-child {
  font-size: 14px;
  line-height: 2;
  letter-spacing: 0.06em;
}
/* =========================
   CONCEPT
========================= */

.concept {
  max-width: 1000px;
  margin: 0 auto;
  padding: 120px 60px 20px;
}


/* CONCEPT メインビジュアル */
.concept-visual {
  width: 100%;
  height: 520px;
  overflow: hidden;
}

.concept-visual img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: left center;
}


.concept-title p {
  position: relative;
  left: 50%;
  width: max-content;
  transform: translateX(-50%);
}
.concept-item {
  width: 100%;
}
.concept-timeline {
  position: relative;
}

.concept-timeline::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 60px;
  bottom: 60px;
  width: 1px;
  background-color: #cfcfcf;
}
.concept-wide-image {
  display: none;
}

/* CONCEPT 写真と文字を重ねる */

.concept-visual {
  height: 0;
  overflow: visible;
}

.concept-visual img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 1100px;
  object-fit: cover;
  object-position: left center;
  transform: scale(2.0);
transform-origin: top left; 
  z-index: -1;
}

.concept {
  position: relative;
  z-index: 1;
  width: 90%;
  max-width: 1000px;
  margin: 0 auto;
  padding: 200px 60px 100px;
  transform: none;
  background: transparent;
}

/* 写真に薄い白フィルター */
.concept-visual::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 1100px;
  background: rgba(255, 255, 255, 0.20);
  pointer-events: none;
  z-index: 0;
}

/* 文字を写真より前に */
.concept {
  position: relative;
  z-index: 1;
}

/* メインタイトルの位置 */
.concept-title {
  text-align: left;
  transform: none;
  margin-bottom: 30px;
}

.concept-title h1 {
  font-size: 46px;
}

/* 01・02・03 */
.concept-number {
  font-size: 56px;
}

.concept-en {
  font-size: 14px;
}

.concept-text h2 {
  font-size: 36px;
}

.concept-text > p:last-child {
  font-size: 18px;
}

/* CONCEPT 背景写真の配置基準 */
.concept-main {
  position: relative;
  isolation: isolate;
}

/* 背景写真をCONCEPT全体に合わせる */
.concept-visual {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  pointer-events: none;
  z-index: -1;
}

.concept-visual img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: left top;
  transform: none;
  transform-origin: left top;
}

/* 白いフィルター */
.concept-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.25);
  pointer-events: none;
  z-index: 0;
}
/* ヘッダーとロゴを最前面に表示 */
.hero-header {
  position: absolute;
  z-index: 100;
}

@media (min-width: 768px) and (max-width: 1024px) {
  .concept-visual {
    position: relative;
    inset: auto;
    height: clamp(360px, 52vw, 540px);
    overflow: hidden;
    z-index: 0;
  }

  .concept-visual img {
    position: absolute;
    width: 100%;
    height: 100%;
    transform: none;
    object-position: center;
  }

  .concept-visual::after {
    height: 100%;
  }

  .concept {
    max-width: 900px;
    width: 90%;
    padding: 70px 0 80px;
    transform: none;
  }

  .concept-title h1 {
    font-size: clamp(34px, 4.2vw, 42px);
  }

  .concept-timeline {
    margin-left: 16px;
  }

  .concept-timeline::before {
    left: -20px;
  }

  .concept-item {
    grid-template-columns: 72px minmax(0, 1fr) minmax(180px, 38%);
    gap: 18px;
    padding: 44px 0;
  }

  .concept-item::before {
    left: -24px;
  }

  .concept-number {
    font-size: 42px;
  }

  .concept-en {
    font-size: 12px;
  }

  .concept-text h2 {
    font-size: clamp(24px, 3vw, 30px);
  }

  .concept-text > p:last-child {
    font-size: 16px;
  }
}

@media (max-width: 767px) {
  .concept-visual {
    position: relative;
    inset: auto;
    height: min(72svh, 520px);
    min-height: 340px;
    overflow: hidden;
    z-index: 0;
  }

  .concept-visual img {
    position: absolute;
    width: 100%;
    height: 100%;
    transform: none;
    object-position: center;
  }

  .concept-visual::after {
    height: 100%;
  }

  .concept {
    width: calc(100% - 40px);
    max-width: none;
    padding: 48px 0 64px;
    transform: none;
  }

  .concept-title {
    margin-bottom: 34px;
  }

  .concept-title h1 {
    font-size: clamp(26px, 7vw, 36px);
    line-height: 1.5;
  }

  .concept-timeline {
    margin-left: 12px;
  }

  .concept-timeline::before {
    left: -16px;
    top: 30px;
    bottom: 30px;
  }

  .concept-item {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 30px 0;
  }

  .concept-item::before {
    left: -20px;
    top: 36px;
    width: 7px;
    height: 7px;
  }

  .concept-number {
    font-size: 32px;
  }

  .concept-en {
    margin-bottom: 10px;
    font-size: 11px;
  }

  .concept-text h2 {
    margin-bottom: 12px;
    font-size: clamp(22px, 6vw, 28px);
    line-height: 1.6;
  }

  .concept-text > p:last-child {
    font-size: 15px;
    line-height: 1.9;
  }

  .concept-image {
    min-height: 190px;
    margin-top: 8px;
  }
}