:root {
  --navy: #062d68;
  --navy-2: #00458f;
  --blue: #1f7bc5;
  --sky: #eaf7ff;
  --green: #67bc8c;
  --ink: #10284d;
  --muted: #62718a;
  --line: #d8e5f4;
  --paper: #f8fcff;
  --white: #ffffff;
  --shadow: 0 16px 44px rgba(8, 56, 112, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Yu Gothic", "Hiragino Kaku Gothic ProN", Meiryo, system-ui, sans-serif;
  line-height: 1.75;
  letter-spacing: 0;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: minmax(340px, 0.72fr) minmax(0, 1fr);
  align-items: center;
  gap: 28px;
  min-height: 78px;
  padding: 0 clamp(22px, 4vw, 64px);
  background: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid rgba(11, 75, 153, 0.08);
  backdrop-filter: blur(18px);
}

.brand,
.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 900;
  color: var(--navy);
}

.brand strong,
.footer-brand strong {
  line-height: 1.55;
}

.brand-mark {
  position: relative;
  display: inline-block;
  width: 36px;
  height: 36px;
  flex: 0 0 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--navy), var(--blue));
}

.brand-mark::after {
  position: absolute;
  inset: 7px 8px 8px 6px;
  border: 3px solid #fff;
  border-right-color: transparent;
  border-radius: 50%;
  content: "";
}

.site-nav {
  display: flex;
  justify-content: center;
  gap: clamp(18px, 2.5vw, 38px);
  font-size: 14px;
  font-weight: 800;
}

.mobile-menu {
  display: none;
}

.site-nav a {
  position: relative;
  padding: 29px 0 24px;
}

.site-nav a.active::after,
.site-nav a:hover::after {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 16px;
  height: 2px;
  background: var(--navy);
  content: "";
}

.join-button,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  min-height: 48px;
  padding: 0 26px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-weight: 900;
}

.join-button,
.button.primary {
  color: var(--white);
  background: linear-gradient(135deg, var(--navy), var(--navy-2));
  box-shadow: 0 14px 28px rgba(3, 45, 104, 0.2);
}

.button.secondary {
  color: var(--navy);
  background: var(--white);
  border-color: var(--navy);
}

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

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(520px, 1.1fr);
  align-items: center;
  min-height: 560px;
  padding: 72px clamp(22px, 4vw, 64px) 68px;
  overflow: hidden;
  background:
    radial-gradient(circle at 80% 20%, rgba(76, 183, 234, 0.23), transparent 34%),
    linear-gradient(90deg, #fff 0%, #fff 36%, rgba(235, 248, 255, 0.78) 100%);
}

.hero::after {
  position: absolute;
  right: -120px;
  top: 40px;
  width: min(62vw, 780px);
  height: min(46vw, 560px);
  background: rgba(21, 127, 199, 0.13);
  border-radius: 50%;
  content: "";
}

.hero-copy {
  position: relative;
  z-index: 2;
  max-width: 610px;
}

.eyebrow {
  margin: 0 0 16px;
  color: var(--navy-2);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.08em;
}

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

.hero-copy,
.hero-art,
.site-header,
.site-nav,
.section,
.info-section,
.join-section,
.site-footer {
  min-width: 0;
}

h1 {
  margin-bottom: 24px;
  color: var(--navy);
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(42px, 5vw, 72px);
  line-height: 1.32;
  letter-spacing: 0;
}

.lead {
  max-width: 560px;
  margin-bottom: 32px;
  color: var(--ink);
  font-size: 18px;
  font-weight: 700;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.hero-art {
  position: relative;
  z-index: 1;
  min-height: 430px;
}

.landscape {
  position: absolute;
  right: -4vw;
  top: 0;
  width: min(760px, 70vw);
  height: 430px;
  object-fit: cover;
  clip-path: ellipse(76% 64% at 62% 48%);
  filter: saturate(1.05) brightness(1.07);
}

.hero-art::before {
  position: absolute;
  right: 6vw;
  top: 10px;
  width: 440px;
  height: 420px;
  border: 1px solid rgba(103, 188, 140, 0.5);
  border-radius: 50%;
  content: "";
}

.circle {
  position: absolute;
  display: grid;
  place-items: center;
  border-radius: 50%;
  overflow: hidden;
  box-shadow: 0 18px 42px rgba(0, 80, 146, 0.16);
}

.circle-large {
  left: 4vw;
  bottom: 30px;
  width: 220px;
  height: 220px;
  padding: 24px;
  color: var(--navy);
  background: rgba(255, 255, 255, 0.84);
  border: 1px solid rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
}

.circle-large span,
.circle-medium span {
  display: block;
  color: var(--navy-2);
  font-size: 13px;
  font-weight: 900;
  text-align: center;
}

.circle-large strong {
  display: block;
  margin-top: 8px;
  font-size: 26px;
  line-height: 1.35;
  text-align: center;
}

.circle-medium {
  right: 110px;
  bottom: 64px;
  width: 130px;
  height: 130px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.82), rgba(180, 233, 255, 0.86));
}

.circle-small {
  left: 20px;
  bottom: 70px;
  width: 18px;
  height: 18px;
  background: #7ed36d;
  box-shadow: none;
}

.section {
  padding: 56px clamp(22px, 6vw, 82px);
}

.section-title {
  text-align: center;
}

.section-title h2,
.block-heading h2 {
  margin-bottom: 24px;
  color: var(--navy);
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(28px, 3vw, 38px);
  line-height: 1.3;
}

.section-title h2::after {
  display: block;
  width: 46px;
  height: 2px;
  margin: 12px auto 0;
  background: var(--blue);
  content: "";
}

.activity-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  max-width: 1120px;
  margin: 0 auto;
}

.activity-card {
  position: relative;
  min-height: 230px;
  padding: 32px 26px;
  border: 1px solid #e2ebf6;
  border-radius: 8px;
  background: var(--white);
  box-shadow: var(--shadow);
}

.icon,
.stat-icon {
  display: grid;
  place-items: center;
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  border-radius: 50%;
  color: var(--navy-2);
  background: #eef6ff;
  font-weight: 900;
}

.activity-card.accent-green .icon,
.stat-icon.green {
  color: #22805b;
  background: #eaf8f0;
}

.activity-card h3 {
  margin-bottom: 10px;
  color: var(--navy);
  font-size: 19px;
  text-align: center;
}

.activity-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.activity-card > a {
  position: absolute;
  right: 18px;
  bottom: 18px;
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  color: var(--navy-2);
  background: #eff7fb;
  font-size: 24px;
}

.info-section {
  display: grid;
  grid-template-columns: minmax(300px, 0.48fr) minmax(0, 1fr);
  gap: 42px;
  padding: 8px clamp(22px, 6vw, 82px) 44px;
}

.block-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.block-heading a {
  color: var(--navy);
  font-size: 14px;
  font-weight: 900;
}

.news-list {
  display: grid;
  gap: 14px;
}

.news-list a {
  display: grid;
  grid-template-columns: 98px 1fr 18px;
  gap: 16px;
  align-items: center;
  min-height: 74px;
  padding: 0 20px;
  border: 1px solid #e2ebf6;
  border-radius: 8px;
  background: var(--white);
  box-shadow: 0 10px 26px rgba(8, 56, 112, 0.08);
}

.news-list time {
  color: var(--navy-2);
  font-size: 13px;
  font-weight: 900;
}

.news-list span {
  color: var(--ink);
  font-size: 14px;
  font-weight: 800;
}

.event-feature {
  position: relative;
  min-height: 250px;
  overflow: hidden;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.event-feature img {
  width: 100%;
  height: 100%;
  min-height: 250px;
  object-fit: cover;
}

.event-feature::after {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(0, 37, 92, 0.88), rgba(0, 73, 140, 0.48), rgba(0, 73, 140, 0.12));
  content: "";
}

.event-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  max-width: 520px;
  padding: 36px;
  color: var(--white);
}

.event-overlay h3 {
  margin-bottom: 20px;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(26px, 3vw, 36px);
  line-height: 1.35;
}

.event-overlay p {
  margin-bottom: 8px;
  font-weight: 800;
}

.event-overlay .button {
  margin-top: 18px;
}

.result-section {
  background: var(--white);
}

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  max-width: 1100px;
  margin: 12px auto 0;
}

.stats div {
  display: grid;
  grid-template-columns: 72px 1fr;
  align-items: center;
  gap: 18px;
  padding: 14px 28px;
  border-left: 1px solid var(--line);
}

.stats div:last-child {
  border-right: 1px solid var(--line);
}

.stats p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.stats strong {
  display: block;
  color: var(--navy);
  font-family: Georgia, serif;
  font-size: 34px;
  font-weight: 500;
  line-height: 1.15;
}

.join-section {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 0.65fr) minmax(280px, 0.35fr);
  gap: 24px;
  align-items: center;
  max-width: 1120px;
  margin: 10px auto 46px;
  overflow: hidden;
  border: 1px solid #8bc4ee;
  border-radius: 12px;
  background: linear-gradient(90deg, #f6fbff 0%, #e7f6ff 100%);
  box-shadow: var(--shadow);
}

.join-section > div {
  padding: 42px 52px;
}

.join-section h2 {
  margin-bottom: 14px;
  color: var(--navy);
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: 30px;
}

.join-section p {
  max-width: 680px;
  color: var(--ink);
  font-weight: 700;
}

.join-section img {
  width: 100%;
  height: 100%;
  min-height: 210px;
  object-fit: cover;
  opacity: 0.88;
}

.contact-section {
  background: var(--white);
}

.contact-section .section-title p {
  margin-top: -10px;
  color: var(--muted);
  font-weight: 700;
}

.contact-form {
  display: grid;
  gap: 16px;
  max-width: 760px;
  margin: 0 auto;
  padding: 30px;
  border: 1px solid #e2ebf6;
  border-radius: 8px;
  background: var(--paper);
}

.contact-form label {
  display: grid;
  gap: 8px;
  color: var(--ink);
  font-weight: 900;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  border: 1px solid #c9d8eb;
  border-radius: 8px;
  padding: 12px 13px;
  background: var(--white);
  font: inherit;
}

.contact-form button {
  min-height: 50px;
  border: 0;
  border-radius: 999px;
  color: var(--white);
  background: var(--navy);
  font: inherit;
  font-weight: 900;
  cursor: pointer;
}

.site-footer {
  display: grid;
  grid-template-columns: minmax(260px, 0.8fr) minmax(0, 1fr);
  gap: 36px;
  padding: 34px clamp(22px, 6vw, 82px);
  color: var(--white);
  background: linear-gradient(135deg, #003172, #0055a8);
}

.site-footer .brand-mark {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.4);
}

.site-footer .footer-brand,
.site-footer a {
  color: var(--white);
}

.site-footer p,
.site-footer small {
  margin: 8px 0 0;
  color: rgba(255, 255, 255, 0.86);
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 24px 42px;
  align-content: start;
  padding-top: 10px;
  font-weight: 800;
}

.site-footer small {
  grid-column: 2;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  padding-top: 14px;
}

@media (max-width: 980px) {
  .site-header {
    grid-template-columns: 1fr auto;
    gap: 16px;
    padding-block: 16px;
  }

  .site-nav {
    display: none;
  }

  .mobile-menu {
    position: relative;
    display: block;
    justify-self: end;
    grid-column: 2;
    grid-row: 1;
  }

  .mobile-menu summary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 0 18px;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--navy);
    background: var(--white);
    font-weight: 900;
    cursor: pointer;
    list-style: none;
  }

  .mobile-menu summary::-webkit-details-marker {
    display: none;
  }

  .mobile-menu nav {
    position: absolute;
    right: 0;
    top: calc(100% + 10px);
    z-index: 30;
    display: grid;
    width: 210px;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--white);
    box-shadow: var(--shadow);
  }

  .mobile-menu nav a {
    padding: 12px 16px;
    color: var(--ink);
    font-weight: 900;
    border-bottom: 1px solid var(--line);
  }

  .mobile-menu nav a:last-child {
    border-bottom: 0;
  }

  .hero,
  .info-section,
  .join-section,
  .site-footer {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 42px;
  }

  .hero-art {
    min-height: 360px;
  }

  .landscape {
    right: -22vw;
    width: 112vw;
  }

  .activity-grid,
  .stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .site-footer small {
    grid-column: 1;
  }
}

@media (max-width: 620px) {
  .site-header {
    grid-template-columns: 1fr;
    align-items: center;
  }

  .mobile-menu {
    grid-column: 1;
    grid-row: auto;
    justify-self: stretch;
    width: 100%;
  }

  .join-button {
    grid-column: 1 / -1;
    width: 100%;
  }

  .brand {
    gap: 8px;
    font-size: 14px;
  }

  .brand-mark {
    width: 32px;
    height: 32px;
    flex: 0 0 32px;
  }

  .mobile-menu summary {
    width: 100%;
    min-height: 38px;
    padding: 0 13px;
    font-size: 13px;
  }

  .mobile-menu nav {
    left: 0;
    right: 0;
    width: 100%;
  }

  .hero {
    padding: 34px 22px 44px;
    overflow: hidden;
    max-width: 100vw;
  }

  h1 {
    font-size: 34px;
  }

  .lead {
    font-size: 16px;
    max-width: 100%;
  }

  .hero-copy,
  .hero-actions {
    width: 100%;
    max-width: 100%;
    padding-right: 18px;
  }

  .hero .button {
    width: min(320px, 88%);
    max-width: 320px;
  }

  .button,
  .hero-actions {
    width: 100%;
  }

  .hero-art {
    width: 100%;
    min-height: 340px;
    overflow: hidden;
  }

  .landscape {
    top: 16px;
    left: 0;
    right: auto;
    width: 100%;
    max-width: none;
    height: 300px;
  }

  .hero-art::before {
    right: -80px;
    width: 300px;
    height: 300px;
  }

  .circle-large {
    left: 10px;
    bottom: 8px;
    width: 156px;
    height: 156px;
  }

  .circle-large strong {
    font-size: 20px;
  }

  .circle-medium {
    display: none;
  }

  .activity-grid,
  .stats {
    grid-template-columns: 1fr;
  }

  .stats div,
  .stats div:last-child {
    border-right: 0;
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .news-list a {
    grid-template-columns: 1fr 18px;
  }

  .news-list time {
    grid-column: 1 / -1;
  }

  .event-overlay {
    padding: 26px;
  }

  .join-section {
    margin-inline: 22px;
  }

  .join-section > div {
    padding: 30px 24px;
  }

  .site-footer nav {
    gap: 16px 24px;
  }
}