/* ── PC専用明示改行 — スマホでは自然折り返し ── */
.line-pc-only {
  display: block;
}

.br-pc-only {
  display: inline; /* <br>のデフォルト確認用、mobile側でnoneにする */
}

@media (max-width: 768px) {
  .line-pc-only {
    display: inline;
  }
  .br-pc-only {
    display: none;
  }
}

@media (max-width: 768px) {
  body {
    font-size: 15px;
    line-height: 1.9;
  }

  .page-hero .subtext {
    font-size: 15px;
    line-height: 2;
    letter-spacing: .05em;
  }

  .phase-row .phase-body {
    font-size: 15px;
    line-height: 2;
  }

  .concept-row .def {
    font-size: 14.5px;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .nav-hamburger {
    display: flex;
  }

  .nav-logo img {
    width: clamp(100px, 36vw, 160px);
  }

  .footer-logo img {
    width: clamp(110px, 40vw, 170px);
  }

  .two-col {
    grid-template-columns: 1fr;
  }

  .two-col .col-img {
    order: -1;
  }

  .grid-surface.two-up {
    grid-template-columns: 1fr;
  }

  .grid-surface.three-up {
    grid-template-columns: 1fr;
  }

  .gates-grid {
    grid-template-columns: 1fr;
  }

  .phase-row {
    grid-template-columns: 1fr;
  }

  .concept-row-inner {
    grid-template-columns: 1fr;
  }

  .corp-row {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .footer-links {
    flex-direction: column;
    gap: 24px;
  }

  .footer-inner {
    flex-direction: column;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 8px;
  }
}

@media (max-width: 768px) {
  .book-top {
    padding: clamp(48px, 8vh, 72px) var(--section-x-wide);
  }

  .book-top__label {
    font-size: clamp(16px, 4.5vw, 20px);
    gap: 0.8em;
  }

  .book-top__label::before,
  .book-top__label::after {
    width: clamp(24px, 6vw, 40px);
  }

  .book-top__grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .book-top__cover-col {
    max-width: 240px;
    margin: 0 auto;
    text-align: center;
  }

  .book-top__cover img {
    width: 100%;
    max-width: 240px;
    height: auto;
    margin: 0 auto;
  }

  .book-top__body {
    font-size: clamp(15px, 4vw, 17px);
  }

  .book-toc-pickup--left {
    text-align: left;
  }
}

@media (max-width: 480px) {
  .page-hero {
    padding: 100px 16px 64px;
  }

  .cta-block .links {
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 768px) {
  .news-teaser {
    padding: clamp(56px, 10vh, 80px) var(--section-x-wide);
  }

  .news-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .news-teaser__row {
    flex-wrap: wrap;
    row-gap: 8px;
  }

  .news-teaser__row-title {
    flex-basis: 100%;
  }

  .news-page {
    padding: 0 20px clamp(72px, 12vh, 110px);
  }

  .news-detail {
    padding: 100px 20px clamp(72px, 12vh, 110px);
  }

  .news-detail__title {
    font-size: clamp(21px, 6vw, 26px);
  }
}