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

body {
  background-color: #ffffff;
  color: #111111;
  font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic", YuGothic, "Meiryo", sans-serif;
  line-height: 1.85;
  overflow-x: hidden;
}

a {
  color: inherit;
}

.page {
  max-width: 920px;
  width: 100%;
  margin: 0 auto;
  padding: 40px 28px 80px;
}

.logo {
  text-align: center;
  margin-bottom: 48px;
}

.logo img {
  display: inline-block;
  height: 88px;
  width: auto;
  max-width: 100%;
}

.intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
  margin-bottom: 72px;
}

.intro-photo img {
  width: 100%;
  height: auto;
  display: block;
}

.intro-text p {
  font-size: 15px;
  letter-spacing: 0.02em;
  margin-bottom: 1.6em;
}

.intro-text p:last-child {
  margin-bottom: 0;
}

.nav-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  row-gap: 48px;
  width: 100%;
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: #111111;
  flex: 0 0 25%;
  max-width: 25%;
  min-width: 0;
  box-sizing: border-box;
  padding: 0 8px;
}

.nav-icon {
  width: 100%;
  max-width: 148px;
  aspect-ratio: 1;
  height: auto;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-icon svg,
.nav-icon img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: contain;
  min-width: 0;
}

.nav-icon-ig img {
  width: 70%;
  height: 70%;
}

.nav-label {
  font-size: 16px;
  letter-spacing: 0.02em;
  max-width: 100%;
  overflow-wrap: break-word;
}

.nav-item:hover .nav-label,
.nav-item:focus-visible .nav-label {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.nav-item:focus-visible {
  outline: 2px solid #285aeb;
  outline-offset: 8px;
}

@media (max-width: 720px) {
  .page {
    padding: 28px 20px 64px;
  }

  .logo {
    margin-bottom: 32px;
  }

  .logo img {
    height: 64px;
  }

  .intro {
    grid-template-columns: 1fr;
    gap: 24px;
    margin-bottom: 48px;
  }

  .nav-grid {
    row-gap: 32px;
  }

  .nav-item {
    flex: 0 0 50%;
    max-width: 50%;
    padding: 0 4px;
  }

  .nav-icon {
    max-width: 92px;
  }

  .nav-label {
    font-size: 12px;
  }
}

.breadcrumb {
  font-size: 14px;
  margin-bottom: 40px;
}

.breadcrumb a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.about-content {
  max-width: 700px;
}

.about-content h1 {
  font-size: 22px;
  font-weight: 500;
  letter-spacing: 0.08em;
  margin-bottom: 28px;
}

.about-content p {
  font-size: 15px;
  letter-spacing: 0.02em;
  margin-bottom: 1.6em;
}

.collaborators {
  margin-top: 48px;
}

.collaborators h2 {
  font-size: 18px;
  font-weight: 500;
  margin-bottom: 16px;
}

.collaborators p {
  margin-bottom: 0.2em;
}

.collaborators .name {
  font-weight: 700;
}

.about-contact {
  margin-top: 32px;
}

.about-contact p {
  margin-bottom: 0.3em;
}

.about-contact a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.hero {
  width: 100%;
  margin-bottom: 28px;
}

.hero img {
  width: 100%;
  height: auto;
  display: block;
}

.page-lead {
  font-size: 15px;
  letter-spacing: 0.02em;
  margin-bottom: 32px;
}

.subpage h1 {
  font-size: 22px;
  font-weight: 500;
  letter-spacing: 0.08em;
  margin-bottom: 20px;
}

.index-list {
  list-style: none;
}

.index-list li {
  margin-bottom: 1.2em;
}

.index-list a {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.index-meta {
  display: block;
  font-size: 13px;
  color: #555;
  margin-top: 2px;
}

.badge-new {
  color: #c00;
  font-size: 13px;
  margin-left: 6px;
}

.pub-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px 24px;
  margin-bottom: 40px;
}

.pub-item {
  text-align: center;
}

.pub-item img {
  width: 100%;
  height: auto;
  display: block;
  margin-bottom: 10px;
}

.pub-item figcaption {
  font-style: italic;
  font-size: 15px;
}

.pub-note {
  font-size: 14px;
  margin-top: 8px;
}

.pub-more {
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 12px;
}

.pub-more img {
  width: 90px;
  height: auto;
}

.seminar-flyer {
  width: 100%;
  max-width: 640px;
  height: auto;
  display: block;
  margin: 24px 0 32px;
}

.seminar-block {
  margin-bottom: 28px;
}

.seminar-block h2 {
  font-size: 20px;
  font-weight: 500;
  margin-bottom: 16px;
}

.offer-button {
  display: inline-block;
  min-width: 200px;
  text-align: center;
  border: 2px solid #111;
  border-radius: 8px;
  background: rgba(254, 222, 204, 0.4);
  font-size: 20px;
  padding: 10px 16px;
  margin: 8px 0 24px;
  text-decoration: none;
}

.newbook-cover {
  width: 100%;
  max-width: 350px;
  height: auto;
  display: block;
  margin-bottom: 28px;
}

.newbook-quote {
  font-family: "Times New Roman", "YuMincho", "Hiragino Mincho ProN", serif;
  font-size: 18px;
  line-height: 1.9;
  margin-bottom: 24px;
}

.newbook-credit {
  margin-top: 36px;
  font-size: 14px;
}

@media (max-width: 720px) {
  .pub-grid {
    grid-template-columns: 1fr;
  }
}