/* ===== HERO ===== */
#concept-hero {
    padding: 16rem 4rem 6rem;
  background: #F7F9FB;
}

.concept-hero__inner {
  max-width: 1100px;
  margin: 0 auto;
}

.concept-hero__catch {
  display: inline-block;
    padding: 0em 2rem;
    margin-bottom: 2rem;
    background: #ffffff80;
      box-shadow: 0px 0px 0px -2px #eeeeee, 3px 3px 8px rgba(255, 255, 255, 0.8) inset;
}

.concept-hero__heading {
font-size: clamp(21px, 2vw, 32px);
  font-weight: 400;
  letter-spacing: 0.1em;
}

.concept-hero__desc {
    font-size: 16px;
    color: #444;
    line-height: 2;
    padding-left: 30px;
}

/* ===== 3つの最善 ===== */
#concept-best {
  padding: 6rem 4rem;
  background: #fff;
}

.concept-best__inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  gap: 12rem;
}

.concept-best__label {
  writing-mode: vertical-rl;
  /* font-size: clamp(28px, 4vw, 48px); */
  color: #C7D6E2;
  font-weight: 300;
  letter-spacing: 0.1em;
  flex-shrink: 0;
  /* padding-right: 2rem; */
  border-right: 0.5px solid #C7D6E2;
   align-self: flex-start;
}

.concept-best__label p {
  font-size: clamp(28px, 4vw, 48px);
  margin: 0;
  font-weight: 300;
  letter-spacing: 15px;
}
.concept-best__list {
  flex: 1;
}

.best-item {
  display: flex;
  gap: 2rem;
  align-items: center;
  padding: 2.5rem 0;
  border-bottom: 0.5px solid #C7D6E2;
}

.best-item:last-child {
  border-bottom: none;
}

.best-item__img {
  width: 180px;
  flex-shrink: 0;
}

.best-item__img img {
  width: 100%;
  height: auto;
  display: block;
}

.best-item__title {
  font-size: clamp(22px, 2.5vw, 32px);
  color: #444444;
  font-weight: 400;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.best-item__sub {
  font-size: 13px;
  color: #666666;
  font-weight: 400;
  letter-spacing: 0.05em;
}

.best-item__desc {
  font-size: 13px;
  color: #444;
  line-height: 2;
}


.best-item__img {
  width: 220px;
  flex-shrink: 0;
  aspect-ratio: 4/3;
  overflow: hidden;
}

.best-item__img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ===== 開発ストーリー ===== */
#concept-story {
  padding: 6rem 4rem;
  background-size: cover;
  background-position: center;
}

.concept-story__inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  gap: 4rem;
  align-items: flex-start;
}

.concept-story__text {
  flex: 1;
}

.concept-story__text p {
  font-size: 14px;
  color: #444;
  line-height: 2.2;
  margin-bottom: 1.5rem;
}

.concept-story__btn {
  display: inline-block;
  background: #2F4A6D;
  color: #fff;
  font-size: 13px;
  padding: 1rem 2rem;
  text-decoration: none;
  letter-spacing: 0.05em;
  margin-top: 1rem;
  transition: opacity 0.2s;
}

.concept-story__btn:hover {
  opacity: 0.8;
}
.concept-story__title {
  display: flex;
  flex-direction: column;
  writing-mode: vertical-rl;
  color: #2F4A6D;
  font-weight: 300;
  letter-spacing: 0.15em;
  line-height: 1.6;
  flex-shrink: 0;
  align-items: flex-end;  /* ← 追加 */
}

.concept-story__title p {
  border-right: 0.5px solid #a6b9c9;
  padding-left: 1.5rem;
    font-size: clamp(22px, 3vw, 32px);
          margin: 0;
}

.concept-story__title p:first-child {
  border-left: none;
  padding-left: 0;

}

/* ===== PNAとは ===== */
#concept-pna {
  padding: 6rem 4rem;
  background: #F7F9FB;
}

.concept-pna__inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  gap: 4rem;
  align-items: flex-start;
  margin-bottom: 4rem;
}

.concept-pna__text {
  flex: 1;
}

.concept-pna__heading {
  font-size: clamp(20px, 2vw, 28px);
  color: #2F4A6D;
  font-weight: 400;
  margin-bottom: 1.5rem;
}

.concept-pna__desc {
  font-size: 14px;
  color: #444;
  line-height: 2.2;
  margin-bottom: 1.25rem;
}

.concept-pna__logo {
    max-width: 400px;
    flex-shrink: 0;
    opacity: 0.8;
}

.concept-pna__logo img {
  width: 100%;
  height: auto;
}

.concept-pna__achievement {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  gap: 3rem;
  align-items: flex-start;
  margin-bottom: 3rem;
}

.concept-pna__achievement-img {
  width: 45%;
  flex-shrink: 0;
}

.concept-pna__achievement-img img {
  width: 100%;
  height: auto;
  display: block;
}

.concept-pna__achievement-label {
  font-size: 12px;
  color: #6F8FA6;
  margin-bottom: 0.75rem;
}

.concept-pna__achievement-desc {
  font-size: 14px;
  color: #444;
  line-height: 2.2;
}

.concept-pna__footer {
  max-width: 1100px;
      margin: 64px auto;
}

.concept-pna__btn {
  display: inline-block;
  background: #2F4A6D;
  color: #fff;
  font-size: 13px;
  padding: 1.25rem 3rem;
  text-decoration: none;
  letter-spacing: 0.05em;
  transition: opacity 0.2s;
}

.concept-pna__btn:hover {
  opacity: 0.8;
}

/* ===== スマホ ===== */
@media (max-width: 768px) {
    #concept-hero{
    padding: 10rem 1.5rem 5rem;
  }

  #concept-best,
  #concept-story,
  #concept-pna {
    padding: 4rem 1.5rem;
  }

  .concept-best__inner {
    flex-direction: column;
    gap: 1.5rem;
  }

.concept-hero__desc {
  font-size: 14.5px;
    padding-left: 0px;
}



  .concept-best__label {
    writing-mode: horizontal-tb;
    border-right: none;
    border-bottom: 0.5px solid #C7D6E2;
    padding-right: 0;
    padding-bottom: 1rem;
    font-size: 24px;
  }
.concept-best__label p {
  font-size:21px;
  letter-spacing: 6px;
}
  .best-item {
    flex-direction: column;
    align-items: flex-start;
  }

  .best-item__img {
    width: 100%;
  }

  .concept-story__inner {
    flex-direction: column-reverse;
    gap: 2rem;
  }

  .concept-story__title {
    writing-mode: horizontal-tb;
    justify-content: flex-end;
    font-size: 21px;    
    width: 95%;
  }


  .concept-story__title p {
    border-right: none;
    padding-left: 0;
  }

  .concept-pna__inner,
  .concept-pna__achievement {
    flex-direction: column;
    gap: 2rem;
  }
.concept-pna__heading {
  margin: 0;
}
  .concept-pna__logo{
    width: 40%;
    margin-left: auto;
  }
  .concept-pna__achievement-img {
    width: 100%;
  }

  .concept-pna__footer {
    text-align: center;
  }
}