:root {
  --bg: #f6fbff;
  --paper: #ffffff;
  --soft: #f2f8fd;
  --ink: #243746;
  --muted: #617887;
  --line: #d8e7f2;
  --sky: #69aeda;
  --sky-deep: #3e8fca;
  --blue: #2d6e9f;
  --blue-deep: #1f577f;
  --shadow: 0 12px 30px rgba(54, 112, 153, 0.1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Noto Sans JP", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.8;
  padding-top: 148px;
}

img {
  max-width: 100%;
  display: block;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.35;
}

p,
ul,
figure {
  margin: 0;
}

.wrap {
  width: min(1360px, calc(100% - 24px));
  margin: 0 auto;
}

.site-header {
  background: #fff;
  border-top: 5px solid var(--sky);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}

.brand-logo {
  width: 180px;
  max-width: 32vw;
  height: auto;
}

.brand-copy {
  display: grid;
}

.brand-copy strong {
  font-size: 1.7rem;
  line-height: 1.2;
}

.brand-copy small {
  color: var(--muted);
  font-size: 0.95rem;
}

.contact-shortcut {
  color: var(--blue-deep);
  text-decoration: none;
  font-weight: 700;
}

.global-nav {
  background: linear-gradient(180deg, #f8fcff, #edf6fc);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  padding: 11px 0;
  align-items: center;
}

.nav-inner > a,
.nav-dropdown-toggle {
  color: var(--ink);
  text-decoration: none;
  font-size: 0.94rem;
}

.nav-dropdown {
  position: relative;
}

.nav-dropdown-toggle {
  padding: 0;
  background: transparent;
  border: 0;
  font: inherit;
  cursor: pointer;
}

.nav-dropdown-toggle::after {
  content: " ▾";
  color: var(--blue-deep);
}

.nav-dropdown-panel {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 320px;
  display: grid;
  gap: 2px;
  padding: 8px 8px 8px;
  margin-top: 0;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: 0 18px 36px rgba(31, 87, 127, 0.16);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(4px);
  transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s ease;
}

.nav-dropdown:hover .nav-dropdown-panel,
.nav-dropdown:focus-within .nav-dropdown-panel {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0);
}

.nav-dropdown-panel a {
  display: block;
  padding: 10px 12px;
  color: var(--ink);
  text-decoration: none;
  background: #fff;
}

.nav-dropdown-panel a:hover {
  background: #eef7fd;
  color: var(--blue-deep);
}

.hero {
  background: #fff;
  border-bottom: 1px solid var(--line);
}

.hero-visual-wide {
  width: 100%;
  height: clamp(320px, 44vw, 640px);
  overflow: hidden;
  position: relative;
  background: #0f2232;
}

.hero-visual-wide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: none;
  opacity: 1;
  filter: none;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 24px;
  padding: 32px 0 42px;
  align-items: start;
}

.hero-copy h1 {
  margin: 10px 0 14px;
  font-family: "Zen Old Mincho", serif;
  font-size: clamp(1.8rem, 4.2vw, 2.95rem);
  color: #214866;
}

.hero-lead {
  display: inline-block;
  padding: 5px 10px;
  background: #fff;
  border-left: 5px solid var(--sky);
  color: var(--blue);
  font-size: 0.9rem;
  font-weight: 700;
}

.hero-copy p {
  color: #486171;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 700;
  border: 0;
  cursor: pointer;
}

.button.primary {
  background: linear-gradient(180deg, var(--sky), var(--sky-deep));
  color: #fff;
}

.button.secondary {
  background: #fff;
  color: var(--blue-deep);
  border: 1px solid #cddfeb;
}

.hero-panel {
  background: #fff;
  border: 1px solid #d7e7f2;
  border-radius: 8px;
  padding: 20px;
  box-shadow: var(--shadow);
}

.hero-panel h2 {
  font-size: 1.3rem;
  color: var(--blue-deep);
  margin-bottom: 10px;
}

.hero-panel ul,
.feature-card ul,
.profile-card ul,
.meta-list {
  padding-left: 20px;
}

.hero-note {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px dashed #cfe0eb;
}

.purpose-section {
  padding: 42px 0 20px;
  background: linear-gradient(180deg, #ffffff 0%, #f8fbfe 100%);
}

.purpose-lead {
  max-width: 920px;
  font-size: 1.12rem;
  line-height: 1.9;
  color: var(--blue-deep);
}

.notice-section {
  background: #f7fbfe;
  border-bottom: 1px solid var(--line);
}

.notice-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 16px;
  padding: 22px 0;
}

.notice-grid article {
  background: #fff;
  border: 1px solid #dceaf3;
  padding: 18px;
  box-shadow: var(--shadow);
}

.notice-grid h2,
.section-title h2,
.footer-inner h2 {
  font-family: "Zen Old Mincho", serif;
}

.notice-grid h2 {
  font-size: 1.2rem;
  color: var(--blue-deep);
  margin-bottom: 8px;
}

.notice-grid ul {
  padding-left: 18px;
}

.fixed-visual-band {
  min-height: 320px;
  background:
    linear-gradient(rgba(11, 30, 46, 0.34), rgba(11, 30, 46, 0.56)),
    url("fixed-bg-v2.png") center center / cover no-repeat fixed;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
}

.fixed-visual-overlay {
  min-height: 320px;
  display: flex;
  align-items: center;
}

.fixed-visual-copy {
  color: #fff;
}

.fixed-visual-copy p {
  display: inline-block;
  margin-bottom: 12px;
  padding: 4px 10px;
  background: rgba(105, 174, 218, 0.82);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.fixed-visual-copy h2 {
  max-width: 760px;
  font-family: "Zen Old Mincho", serif;
  font-size: clamp(2rem, 4.6vw, 3.6rem);
  line-height: 1.25;
}

.content-section {
  padding: 38px 0;
  background: #fff;
}

.content-section.pale {
  background: var(--soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-title {
  margin-bottom: 20px;
}

.section-title span {
  display: inline-block;
  margin-bottom: 8px;
  padding: 4px 10px;
  background: var(--sky);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 700;
}

.section-title h2 {
  font-size: clamp(1.6rem, 4vw, 2.5rem);
  color: #214866;
}

.feature-grid,
.book-grid,
.post-grid,
.issue-grid,
.profile-grid {
  display: grid;
  gap: 18px;
}

.two-col {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.three-col {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.feature-card,
.book-card,
.post-card,
.profile-card,
.issue-grid p,
.lecturer-card {
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.feature-card,
.book-card,
.post-card,
.profile-card {
  padding: 22px;
}

.feature-card h3,
.book-card h3,
.post-card h3,
.profile-card h3,
.lecturer-body h3 {
  font-size: 1.3rem;
  color: var(--blue-deep);
  margin-bottom: 10px;
}

.feature-card a {
  display: inline-block;
  margin-top: 14px;
  color: var(--blue-deep);
  font-weight: 700;
  text-decoration: none;
}

.feature-card.large {
  border-top: 4px solid var(--sky);
}

.feature-card.large.accent-blue,
.post-card {
  border-top: 4px solid var(--blue);
}

.book-grid {
  grid-template-columns: 1.2fr 1fr;
}

.book-card.featured {
  background: linear-gradient(180deg, #fafdff, #fff);
  border-left: 6px solid var(--sky);
}

.book-cover-card {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 20px;
  align-items: start;
}

.book-cover-wrap img,
.lecturer-photo-wrap img {
  width: 100%;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.book-tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 4px 10px;
  background: #e7f3fb;
  color: var(--blue-deep);
  font-size: 0.82rem;
  font-weight: 700;
}

.book-rank {
  display: inline-block;
  margin-bottom: 12px;
  padding: 6px 12px;
  background: linear-gradient(180deg, #f1b63f, #d8961f);
  color: #fff;
  font-size: 0.86rem;
  font-weight: 800;
}

.book-highlight {
  margin-top: 14px;
  padding: 12px 14px;
  background: #eef7fd;
  border-left: 4px solid var(--sky);
}

.book-actions {
  margin-top: 16px;
}

.meta-list {
  margin-top: 14px;
}

.lecturer-card {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 24px;
  padding: 22px;
}

.lecturer-role {
  font-weight: 700;
  color: var(--blue-deep);
}

.lecturer-body {
  display: grid;
  gap: 8px;
}

.post-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.training-link {
  color: var(--blue-deep);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.training-link:hover {
  color: var(--sky-deep);
  border-color: var(--sky-deep);
}

.issue-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.issue-grid p {
  padding: 18px;
  border-left: 4px solid var(--sky);
}

.profile-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.site-footer {
  background: #315d7c;
  color: rgba(255, 255, 255, 0.95);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 20px;
  padding: 34px 0;
}

.footer-title {
  margin-bottom: 8px;
  color: #d5ecfb;
  font-weight: 700;
}

.footer-inner h2 {
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  margin-bottom: 10px;
}

.footer-actions {
  display: grid;
  gap: 12px;
  align-content: start;
  padding-top: 52px;
}

.footer-actions .button.secondary {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.24);
}

@media (max-width: 900px) {
  .hero-inner,
  .notice-grid,
  .two-col,
  .three-col,
  .book-grid,
  .book-cover-card,
  .lecturer-card,
  .post-grid,
  .issue-grid,
  .profile-grid,
  .footer-inner,
  .nav-dropdown-panel {
    grid-template-columns: 1fr;
  }

  .header-top {
    align-items: flex-start;
    flex-direction: column;
  }

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

  .nav-dropdown-panel {
    position: static;
    min-width: 0;
    margin-top: 8px;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
  }

  .fixed-visual-band,
  .fixed-visual-overlay {
    min-height: 240px;
  }
}

@media (max-width: 640px) {
  body {
    padding-top: 136px;
  }

  .wrap {
    width: min(1360px, calc(100% - 16px));
  }

  .content-section,
  .footer-inner,
  .notice-grid {
    padding-top: 24px;
    padding-bottom: 24px;
  }

  .feature-card,
  .book-card,
  .post-card,
  .profile-card,
  .issue-grid p,
  .notice-grid article,
  .hero-panel,
  .lecturer-card {
    padding: 16px;
  }

  .nav-inner {
    gap: 12px;
  }

  .brand-logo {
    width: 130px;
    max-width: 44vw;
  }

  .fixed-visual-band {
    background-attachment: scroll;
  }
}