:root {
  color-scheme: light;
  --bg: #eaf8f3;
  --paper: #fffdf4;
  --paper-2: #f7fbf6;
  --ink: #123a36;
  --muted: #5b746d;
  --spruce: #0f6f54;
  --spruce-dark: #074638;
  --river: #0b7f8a;
  --moss: #6f8420;
  --cedar: #233d32;
  --clay: #6f311c;
  --line: rgba(15, 111, 84, 0.22);
  --shadow: 0 18px 50px rgba(7, 70, 56, 0.12);
  --radius: 8px;
  --body-font: "BIZ UDPGothic", "Yu Gothic", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  --display-font: "Yu Mincho", "Hiragino Mincho ProN", "Noto Serif JP", serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(90deg, rgba(15, 111, 84, 0.07) 1px, transparent 1px),
    linear-gradient(0deg, rgba(15, 111, 84, 0.06) 1px, transparent 1px),
    var(--bg);
  background-size: 42px 42px;
  font-family: var(--body-font);
  line-height: 1.7;
}

a {
  color: inherit;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

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

.skip-link {
  position: absolute;
  left: 16px;
  top: 12px;
  z-index: 20;
  transform: translateY(-160%);
  background: var(--spruce-dark);
  color: white;
  padding: 8px 12px;
  border-radius: var(--radius);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(234, 248, 243, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}

.header-inner {
  width: min(1160px, calc(100% - 28px));
  min-height: 76px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
}

.brand {
  flex: 0 0 auto;
  width: min(420px, 44vw);
}

.brand img {
  width: 100%;
  height: auto;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
}

.site-nav::-webkit-scrollbar {
  display: none;
}

.site-nav a {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 12px;
  border: 1px solid transparent;
  border-radius: 999px;
  color: var(--spruce-dark);
  font-size: 0.93rem;
  font-weight: 700;
  white-space: nowrap;
  text-decoration: none;
  transition: background 180ms ease, border-color 180ms ease, transform 180ms ease;
}

.site-nav a:hover,
.site-nav a.active {
  background: var(--paper);
  border-color: var(--line);
  transform: translateY(-1px);
}

.intro-band {
  width: min(1160px, calc(100% - 28px));
  margin: 38px auto 18px;
}

.intro-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 290px;
  gap: 26px;
  align-items: stretch;
}

.intro-copy {
  min-width: 0;
  padding: clamp(28px, 5vw, 60px);
  background: linear-gradient(135deg, rgba(255, 253, 244, 0.96), rgba(247, 251, 246, 0.94));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.kicker,
.section-label {
  margin: 0 0 8px;
  color: var(--moss);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 18px;
  color: var(--spruce-dark);
  font-family: var(--display-font);
  font-size: clamp(2.1rem, 4.6vw, 4.4rem);
  line-height: 1.05;
  letter-spacing: 0;
  word-break: keep-all;
}

h1 span {
  display: inline-block;
}

.lead {
  max-width: 850px;
  margin-bottom: 0;
  color: #174f47;
  font-size: clamp(1.02rem, 1.8vw, 1.26rem);
  overflow-wrap: anywhere;
}

.update-panel {
  display: flex;
  flex-direction: column;
  justify-content: end;
  gap: 18px;
  padding: 24px;
  min-height: 250px;
  color: white;
  background:
    linear-gradient(rgba(7, 70, 56, 0.45), rgba(7, 70, 56, 0.86)),
    url("assets/wetland-260709.jpg") center / cover;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.updated {
  margin: 0;
  font-weight: 700;
}

.domain-link {
  width: fit-content;
  max-width: 100%;
  padding: 8px 12px;
  overflow-wrap: anywhere;
  color: var(--spruce-dark);
  background: #d8fff1;
  border-radius: var(--radius);
  font-weight: 800;
  text-decoration: none;
}

.mission-band {
  width: min(1160px, calc(100% - 28px));
  margin: 0 auto 26px;
}

.mission-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.mission-list article {
  min-width: 0;
  min-height: 160px;
  padding: 22px;
  background: rgba(255, 253, 244, 0.88);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.mission-list .number {
  display: inline-flex;
  margin-bottom: 16px;
  color: var(--river);
  font-family: var(--display-font);
  font-size: 2rem;
  font-weight: 700;
}

.mission-list p {
  margin-bottom: 8px;
  font-weight: 800;
}

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

.portal-shell {
  width: min(1160px, calc(100% - 28px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: 280px minmax(320px, 1fr) 280px;
  gap: 18px;
  align-items: start;
}

.side-column,
.center-column {
  min-width: 0;
  display: grid;
  gap: 12px;
}

.legacy-tile,
.button-stack a {
  min-height: 58px;
  display: grid;
  align-content: center;
  gap: 2px;
  padding: 10px 14px;
  border-radius: var(--radius);
  color: white;
  text-align: center;
  text-decoration: none;
  box-shadow: 0 8px 20px rgba(7, 70, 56, 0.08);
  transition: transform 180ms ease, filter 180ms ease;
}

.legacy-tile:hover,
.button-stack a:hover,
.story-link:hover,
.feature-card a:hover,
.activity-photo-card a:hover,
.ikuta-info a:hover,
.contact-actions a:hover {
  transform: translateY(-2px);
  filter: brightness(1.04);
}

.legacy-tile strong {
  overflow-wrap: anywhere;
  font-size: 1.12rem;
  line-height: 1.25;
}

.legacy-tile span {
  font-size: 0.78rem;
  line-height: 1.4;
}

.legacy-tile.slate {
  background: var(--cedar);
}

.legacy-tile.brown {
  background: var(--clay);
}

.legacy-tile.green {
  background: var(--spruce);
}

.legacy-tile.ink {
  background: #17436a;
}

.notice-box,
.document-list,
.ikuta-info,
.poster-panel,
.activity-photo-card,
.feature-card,
.feature-story {
  min-width: 0;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 8px 24px rgba(7, 70, 56, 0.08);
}

.notice-box,
.document-list,
.ikuta-info {
  padding: 18px;
}

.notice-box h2,
.document-list h2,
.ikuta-info h2,
.poster-panel h2,
.activity-photo-card h2,
.feature-card h2 {
  margin-bottom: 10px;
  color: var(--spruce-dark);
  font-family: var(--display-font);
  font-size: 1.35rem;
  line-height: 1.3;
  letter-spacing: 0;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.tag-list a {
  display: inline-flex;
  min-height: 30px;
  align-items: center;
  padding: 2px 8px;
  color: var(--spruce-dark);
  background: #e7f7ec;
  border: 1px solid rgba(15, 111, 84, 0.2);
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 700;
  text-decoration: none;
}

.notice-box p {
  overflow-wrap: anywhere;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.93rem;
}

.document-list {
  background: var(--moss);
  color: white;
}

.document-list h2 {
  color: white;
}

.document-list a {
  display: block;
  padding: 6px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.25);
  font-size: 0.9rem;
}

.button-stack {
  display: grid;
  gap: 8px;
}

.button-stack a {
  min-height: 48px;
  color: var(--spruce-dark);
  background: #fff;
  border: 2px solid var(--spruce);
  font-size: 1.04rem;
  font-weight: 800;
}

.feature-story {
  overflow: hidden;
  padding: clamp(20px, 4vw, 34px);
  background:
    linear-gradient(180deg, rgba(255, 253, 244, 0.96), rgba(255, 253, 244, 0.78)),
    linear-gradient(90deg, rgba(15, 111, 84, 0.12), transparent);
}

.story-heading {
  text-align: center;
}

.story-heading p {
  margin-bottom: 2px;
  color: #8b9178;
  font-weight: 800;
}

.story-heading h2,
.story-heading h3 {
  margin: 0;
  font-family: var(--display-font);
  line-height: 1.18;
  letter-spacing: 0;
}

.story-heading h2 {
  color: #8c918f;
  font-size: clamp(2rem, 4vw, 3.4rem);
}

.story-heading h3 {
  color: #9a9f9e;
  font-size: clamp(1.65rem, 3vw, 2.6rem);
}

.story-heading span {
  color: var(--moss);
  font-weight: 800;
}

.feature-story > p {
  margin: 18px 0 10px;
  color: var(--moss);
  font-weight: 700;
}

.story-link,
.feature-card a,
.activity-photo-card a,
.ikuta-info a {
  display: inline-flex;
  width: fit-content;
  max-width: 100%;
  min-height: 36px;
  align-items: center;
  margin-bottom: 12px;
  color: var(--spruce-dark);
  font-weight: 800;
  overflow-wrap: anywhere;
}

.feature-story figure,
.feature-card {
  margin: 0;
}

.feature-story figure {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid rgba(7, 70, 56, 0.16);
}

.feature-story figure img {
  width: 100%;
  min-height: 320px;
  max-height: 470px;
  object-fit: cover;
}

.feature-story figcaption {
  position: absolute;
  left: 16px;
  bottom: 12px;
  color: rgba(255, 255, 255, 0.9);
  font-family: var(--display-font);
  font-size: 1.4rem;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.4);
}

.feature-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 46%;
  gap: 16px;
  align-items: stretch;
  padding: 18px;
}

.feature-card.compact {
  grid-template-columns: 1fr;
  background: #f1fff8;
}

.feature-card p {
  overflow-wrap: anywhere;
  color: var(--moss);
}

.feature-card img {
  width: 100%;
  min-height: 210px;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius);
}

.ikuta-info {
  background: #fffce0;
  border-color: rgba(111, 132, 32, 0.42);
}

.ikuta-info h2 {
  text-align: center;
}

.ikuta-info h2 span {
  font-family: var(--body-font);
  font-size: 0.82rem;
}

.ikuta-info a {
  margin-bottom: 4px;
}

.poster-panel {
  overflow: hidden;
  padding: 10px;
  text-align: center;
}

.poster-panel h2 {
  margin: 2px 0 10px;
  font-size: 1rem;
}

.poster-panel img {
  width: 100%;
  border: 1px solid rgba(15, 111, 84, 0.22);
  border-radius: 4px;
}

.activity-photo-card {
  overflow: hidden;
  padding: 14px;
}

.activity-photo-card h2 {
  margin-bottom: 4px;
  text-align: center;
}

.activity-photo-card img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius);
}

.contact-band {
  width: min(1160px, calc(100% - 28px));
  margin: 32px auto 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 30px;
  color: white;
  background: var(--spruce-dark);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.contact-band h2 {
  margin-bottom: 8px;
  font-family: var(--display-font);
  font-size: clamp(1.8rem, 4vw, 3rem);
  letter-spacing: 0;
}

.contact-band p {
  max-width: 680px;
  margin-bottom: 0;
}

.contact-band .section-label {
  color: #c4e17c;
}

.contact-details {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  max-width: 680px;
  margin: 18px 0 0;
}

.contact-details div {
  min-width: 0;
  padding: 12px 14px;
  color: var(--spruce-dark);
  background: rgba(255, 255, 255, 0.94);
  border-radius: var(--radius);
}

.contact-details dt {
  color: var(--moss);
  font-size: 0.78rem;
  font-weight: 800;
}

.contact-details dd {
  margin: 2px 0 0;
  overflow-wrap: anywhere;
  font-weight: 800;
}

.contact-details a {
  text-decoration: none;
}

.contact-actions {
  display: grid;
  gap: 10px;
  min-width: min(280px, 100%);
}

.contact-actions a {
  display: flex;
  min-height: 52px;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  color: var(--spruce-dark);
  background: white;
  border-radius: var(--radius);
  font-weight: 800;
  text-decoration: none;
  transition: transform 180ms ease, filter 180ms ease;
}

.contact-actions img {
  width: 64px;
  height: 32px;
  object-fit: cover;
  border-radius: 4px;
}

.site-footer {
  width: min(1160px, calc(100% - 28px));
  margin: 24px auto 42px;
  padding: 24px 0;
  color: var(--moss);
  text-align: center;
}

.site-footer p {
  margin-bottom: 12px;
}

.counter {
  color: var(--ink);
}

.counter span {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  margin: 0 4px;
  padding: 0 8px;
  color: #fff;
  background: #171717;
  border-radius: 4px;
  font-family: "Courier New", monospace;
  font-size: 1.1rem;
  letter-spacing: 0;
}

.floating-top {
  position: fixed;
  right: 18px;
  bottom: 18px;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 50%;
  color: white;
  background: var(--river);
  box-shadow: 0 14px 34px rgba(7, 70, 56, 0.24);
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity 180ms ease, transform 180ms ease;
}

.floating-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

@media (max-width: 980px) {
  .header-inner {
    min-height: 94px;
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    gap: 8px;
    padding: 10px 0;
  }

  .brand {
    width: min(420px, 84vw);
  }

  .site-nav {
    width: 100%;
    padding-bottom: 2px;
  }

  .intro-grid,
  .mission-list,
  .portal-shell {
    grid-template-columns: 1fr;
  }

  .portal-shell {
    gap: 22px;
  }

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

  .notice-box,
  .document-list,
  .button-stack,
  .ikuta-info,
  .poster-panel,
  .activity-photo-card {
    grid-column: span 2;
  }

  .contact-band {
    align-items: stretch;
    flex-direction: column;
  }

  .contact-details {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 620px) {
  .intro-band {
    margin-top: 20px;
  }

  .intro-copy,
  .update-panel,
  .contact-band {
    padding: 22px;
  }

  h1 {
    font-size: clamp(1.85rem, 8.8vw, 2.35rem);
    line-height: 1.12;
  }

  .site-nav {
    flex-wrap: wrap;
    overflow-x: visible;
  }

  .site-nav a {
    flex: 1 1 calc(33.333% - 6px);
    padding: 0 8px;
    font-size: 0.86rem;
  }

  .mission-list article {
    min-height: auto;
  }

  .side-column,
  .feature-card {
    grid-template-columns: 1fr;
  }

  .notice-box,
  .document-list,
  .button-stack,
  .ikuta-info,
  .poster-panel,
  .activity-photo-card {
    grid-column: span 1;
  }

  .feature-story figure img {
    min-height: 240px;
  }

  .floating-top {
    width: 42px;
    height: 42px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}