:root {
  --ink: #17232b;
  --navy: #17364a;
  --green: #315d54;
  --paper: #f4f5f2;
  --white: #ffffff;
  --muted: #66737a;
  --line: #d8dedc;
  --container: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: "Noto Sans JP", "Yu Gothic", sans-serif;
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
}

body.menu-open {
  overflow: hidden;
}

a {
  color: inherit;
}

.container {
  width: min(var(--container), calc(100% - 48px));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  color: var(--navy);
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.97);
}

.header-inner {
  min-height: 82px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.brand {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  line-height: 1.45;
}

.brand small {
  color: var(--muted);
  font-size: 0.68rem;
}

.brand strong {
  font-family: "Noto Serif JP", "Yu Mincho", serif;
  font-size: 1.2rem;
  letter-spacing: 0.08em;
}

.global-nav {
  display: flex;
  align-items: center;
  gap: 30px;
}

.global-nav a {
  color: var(--navy);
  font-size: 0.82rem;
  font-weight: 700;
  text-decoration: none;
}

.menu-button {
  display: none;
}

.hero {
  color: var(--white);
  background: var(--navy);
}

.hero-inner {
  min-height: 520px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-block: 110px;
}

.organization-name {
  margin: 0 0 20px;
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.85rem;
}

.hero h1,
.section-heading h2 {
  font-family: "Noto Serif JP", "Yu Mincho", serif;
}

.hero h1 {
  margin: 0;
  font-size: clamp(3.8rem, 10vw, 7rem);
  line-height: 1.15;
  letter-spacing: 0.1em;
}

.hero-lead {
  max-width: 760px;
  margin: 34px 0 0;
  color: rgba(255, 255, 255, 0.82);
  font-size: 1.05rem;
  line-height: 2.15;
}

.section {
  padding: 100px 0;
}

.section-muted {
  background: var(--paper);
}

.section-layout {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: 90px;
}

.section-heading h2 {
  margin: 0;
  color: var(--navy);
  font-size: clamp(1.9rem, 3.5vw, 2.8rem);
  line-height: 1.45;
  letter-spacing: 0.04em;
}

.section-body {
  min-width: 0;
}

.section-intro,
.prose p {
  max-width: 760px;
}

.lead-copy {
  margin: 0 0 28px;
  color: var(--navy);
  font-family: "Noto Serif JP", "Yu Mincho", serif;
  font-size: clamp(1.2rem, 2vw, 1.55rem);
  line-height: 2;
}

.prose p:not(.lead-copy) {
  margin: 0;
  color: #4e5e66;
}

.overview-list {
  margin: 50px 0 0;
  border-top: 1px solid var(--line);
}

.overview-list div {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 30px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.overview-list dt {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}

.overview-list dd {
  margin: 0;
}

.calendar-placeholder {
  min-height: 420px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 40px;
  text-align: center;
  border: 1px solid var(--line);
}

.calendar-placeholder p {
  margin: 0;
  color: var(--navy);
  font-weight: 700;
}

.calendar-placeholder small {
  margin-top: 8px;
  color: var(--muted);
}

.member-list {
  margin-top: 36px;
  padding: 28px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.member-list p {
  margin: 0;
  color: var(--muted);
}

.report-list {
  margin-top: 36px;
  border-top: 1px solid var(--line);
}

.report-list article {
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr);
  gap: 8px 28px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

.report-list time {
  grid-row: 1 / span 2;
  color: var(--muted);
  font-size: 0.8rem;
}

.report-list h3 {
  margin: 0;
  color: var(--navy);
  font-family: "Noto Serif JP", "Yu Mincho", serif;
  font-size: 1.15rem;
}

.report-list p {
  margin: 4px 0 0;
  color: var(--muted);
}

.placeholder-item {
  opacity: 0.6;
}

.link-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.link-list li {
  display: flex;
  justify-content: space-between;
  gap: 30px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.link-list small {
  color: var(--muted);
}

.site-footer {
  padding: 54px 0 30px;
  color: rgba(255, 255, 255, 0.8);
  background: var(--navy);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 40px;
  align-items: end;
}

.footer-inner p {
  margin: 0;
}

.footer-inner strong {
  color: var(--white);
  font-family: "Noto Serif JP", "Yu Mincho", serif;
  font-size: 1.25rem;
  letter-spacing: 0.08em;
}

.copyright {
  font-size: 0.72rem;
}

@media (max-width: 850px) {
  .global-nav {
    position: fixed;
    inset: 0;
    z-index: 30;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 28px;
    color: var(--white);
    background: var(--navy);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
  }

  .global-nav.is-open {
    opacity: 1;
    pointer-events: auto;
  }

  .global-nav a {
    color: var(--white);
    font-size: 1.05rem;
  }

  .menu-button {
    position: relative;
    z-index: 40;
    display: inline-flex;
    min-height: 42px;
    align-items: center;
    padding: 8px 14px;
    color: var(--navy);
    border: 1px solid var(--line);
    background: var(--white);
    font: inherit;
    font-size: 0.78rem;
    font-weight: 700;
    cursor: pointer;
  }

  .menu-button[aria-expanded="true"] {
    color: var(--white);
    border-color: rgba(255, 255, 255, 0.45);
    background: transparent;
  }

  .section-layout {
    grid-template-columns: 1fr;
    gap: 38px;
  }
}

@media (max-width: 620px) {
  .container {
    width: min(var(--container), calc(100% - 32px));
  }

  .header-inner {
    min-height: 72px;
  }

  .brand small {
    font-size: 0.56rem;
  }

  .brand strong {
    font-size: 1rem;
  }

  .hero-inner {
    min-height: 440px;
    padding-block: 82px;
  }

  .hero h1 {
    font-size: clamp(3.2rem, 21vw, 5.2rem);
  }

  .hero-lead {
    font-size: 0.93rem;
    line-height: 2;
  }

  .section {
    padding: 76px 0;
  }

  .calendar-placeholder {
    min-height: 300px;
    padding: 28px;
  }

  .overview-list div {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .report-list article {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .report-list time {
    grid-row: auto;
  }

  .link-list li,
  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}