:root {
  --brand-blue: #0f5483;
  --brand-blue-dark: #083a5a;
  --brand-sky: #dff2ff;
  --page-bg: #ececec;
  --ink: #1f2c39;
  --line: #cfd7de;
  --panel: #ffffff;
  --muted: #5f6d7a;
  --accent: #f0b400;
  --font-main: "Noto Sans JP", sans-serif;
  --font-head: "M PLUS 1p", sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--page-bg);
  font-family: var(--font-main);
  line-height: 1.7;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-head);
}

a {
  color: var(--brand-blue);
  text-decoration: none;
}

a:hover {
  color: var(--brand-blue-dark);
}

.site-header {
  border-bottom: 1px solid var(--line);
  box-shadow: 0 1px 8px rgba(0, 0, 0, 0.05);
  background: #fff;
}

.utility-bar {
  background: var(--brand-blue);
  color: #fff;
  font-size: 0.8rem;
}

.utility-inner {
  display: flex;
  justify-content: space-between;
  padding: 0.28rem 0;
}

.utility-bar a {
  color: #fff;
}

.main-nav {
  border-bottom: 1px solid var(--line);
}

.navbar-brand {
  display: flex;
  gap: 0.7rem;
  align-items: center;
  padding: 0.85rem 0;
  margin-left: 0.4rem;
  margin-right: 1rem;
}

.brand-mark {
  color: var(--brand-blue);
  font-size: 1.2rem;
}

.brand-text {
  display: grid;
}

.brand-text strong {
  font-size: 1rem;
  line-height: 1.2;
}

.brand-text small {
  color: var(--muted);
  font-size: 0.75rem;
}

.main-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.main-nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: stretch;
  flex-wrap: wrap;
}

.main-nav-list li {
  display: flex;
}

.main-nav-list a {
  border-right: 1px solid var(--line);
  color: #183248;
  font-size: 0.84rem;
  padding: 0.75rem 0.88rem;
  display: inline-flex;
  align-items: center;
  line-height: 1.2;
  transition: background-color 0.18s ease, color 0.18s ease;
}

.main-nav-list li:first-child a {
  border-left: 1px solid var(--line);
}

.main-nav-list a.active {
  color: #183248;
  background: #fff;
}

.main-nav-list a:hover {
  color: #fff;
  background: var(--brand-blue);
}

.hero-wrap {
  padding: 2rem 0 1.4rem;
}

.hero-panel {
  position: relative;
  background: linear-gradient(120deg, var(--brand-sky), #f8fcff 55%, #eaf6ff);
  border: 1px solid #d3e6f5;
  min-height: 320px;
  overflow: hidden;
}

.hero-bubbles span {
  position: absolute;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 20%, #9de2ff, #1299d1 65%, #067fb0);
  opacity: 0.85;
  animation: bob 7s ease-in-out infinite;
}

.hero-bubbles span:nth-child(1) { width: 130px; height: 130px; left: 5%; top: 16%; }
.hero-bubbles span:nth-child(2) { width: 70px; height: 70px; left: 2%; top: 54%; animation-delay: 1s; }
.hero-bubbles span:nth-child(3) { width: 44px; height: 44px; left: 16%; top: 68%; animation-delay: 1.6s; }
.hero-bubbles span:nth-child(4) { width: 26px; height: 26px; left: 12%; top: 35%; animation-delay: 2.2s; }
.hero-bubbles span:nth-child(5) { width: 90px; height: 90px; left: 19%; top: 8%; animation-delay: 2.7s; }

@keyframes bob {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-8px); }
}

.hero-copy {
  position: relative;
  z-index: 2;
  max-width: 640px;
  margin-left: auto;
  padding: 4rem 2.2rem 3rem;
}

.hero-copy-en {
  margin: 0;
  color: #48677f;
  letter-spacing: 0.02em;
  font-size: 0.9rem;
}

.hero-copy h1 {
  margin: 0.2rem 0 0.8rem;
  font-size: 2rem;
  line-height: 1.35;
  color: #112436;
}

.hero-tagline {
  margin: 0 0 1rem;
  color: #34556e;
}

.hero-meta {
  margin: 0;
  padding: 0;
  list-style: none;
  color: #22445f;
}

.hero-meta li {
  margin: 0.16rem 0;
}

.hero-meta i {
  margin-right: 0.4rem;
}

.home-main {
  padding-bottom: 1.3rem;
}

.home-grid {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(280px, 1fr);
  gap: 1rem;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
}

.panel h2 {
  margin: 0;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--line);
  font-size: 1.05rem;
  line-height: 1.35;
}

.panel h2 i {
  margin-right: 0.36rem;
  color: var(--accent);
}

.news-list {
  margin: 0;
  padding: 1rem;
  list-style: none;
}

.news-list li + li {
  margin-top: 1.15rem;
}

.news-head {
  margin: 0;
  font-size: 0.95rem;
}

.news-head time {
  color: var(--muted);
  margin-right: 0.6rem;
}

.news-head strong {
  color: #183750;
}

.badge-news {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  border-radius: 999px;
  padding: 0.04rem 0.52rem;
  font-size: 0.72rem;
  margin-right: 0.42rem;
}

.news-body {
  margin: 0.35rem 0 0;
  color: #465869;
  font-size: 0.92rem;
}

.side-stack {
  display: grid;
  gap: 1rem;
}

.event-card {
  padding: 1rem;
  background: linear-gradient(135deg, #294764, #0f243a);
  color: #fff;
}

.event-year {
  margin: 0;
  font-size: 1.9rem;
  font-weight: 800;
  letter-spacing: 0.03em;
}

.event-name {
  margin: 0.2rem 0 0.8rem;
  letter-spacing: 0.02em;
}

.event-link {
  display: inline-block;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.55);
  padding: 0.24rem 0.64rem;
  font-size: 0.9rem;
}

.event-link:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
}

.panel-sponsors ul {
  margin: 0;
  padding: 1rem 1rem 0.4rem;
  list-style: none;
}

.panel-sponsors li {
  margin-bottom: 0.55rem;
  font-weight: 600;
  color: #304d63;
}

.text-link {
  display: inline-block;
  margin: 0.3rem 1rem 1rem;
  font-size: 0.9rem;
}

.home-section {
  padding-bottom: 2rem;
}

.theme-grid {
  padding: 1rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.theme-grid article {
  border: 1px solid var(--line);
  padding: 0.8rem;
  background: #fafcff;
}

.theme-grid h3 {
  margin: 0 0 0.3rem;
  font-size: 1rem;
  color: #18334b;
}

.theme-grid p {
  margin: 0;
  color: #496176;
  font-size: 0.9rem;
}

.panel-action {
  margin: 0;
  padding: 0 1rem 1rem;
  text-align: right;
}

.panel-action a {
  font-size: 0.93rem;
  font-weight: 700;
}

.page-header-section {
  background: var(--page-bg);
  padding: 1rem 0 0.4rem !important;
}

.page-header-section .container {
  background: linear-gradient(120deg, var(--brand-sky), #f8fcff 60%, #eaf6ff);
  border: 1px solid #d3e6f5;
  padding: 0.95rem 1.25rem;
}

.page-title {
  margin: 0;
  color: #18334b;
  font-size: 1.7rem;
}

.page-subtitle {
  color: #4c6173;
}

.page-content-wrap {
  padding-top: 0.8rem !important;
}

.page-content {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 1.4rem 1.65rem;
}

.page-content h2 {
  margin-top: 0.4rem;
  margin-bottom: 1rem;
  color: #1a3146;
}

.about-block {
  background: #fafcff;
  border: 1px solid var(--line);
  padding: 1.1rem 1.2rem;
  margin-bottom: 1rem;
}

.about-block h2 {
  margin-top: 0.1rem;
}

.about-block-tools {
  margin-top: -0.3rem;
}

.page-content p,
.page-content li,
.page-content td,
.page-content th {
  color: #2b3f52;
}

.page-content hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 1.4rem 0;
  opacity: 1;
}

.page-content table {
  width: 100%;
}

.page-content .card {
  border: 0px solid var(--line) !important;
  box-shadow: none !important;
  background: #fafcff;
}

.page-content .badge.bg-navy {
  background: var(--brand-blue);
  color: #fff;
}

.faq-page .faq-intro-block,
.faq-page .faq-category-block,
.faq-page .faq-footer-cta {
  background: #fafcff;
  border: 1px solid var(--line);
  padding: 1rem 1.15rem;
  margin-bottom: 1rem;
}

.faq-page .faq-category-title {
  margin: 0 0 0.9rem;
  color: #18334b;
  display: flex;
  align-items: center;
}

.faq-page .faq-category-title i {
  color: var(--accent);
}

.faq-page .faq-accordion {
  --bs-accordion-border-color: #dce7f0;
  --bs-accordion-btn-bg: #ffffff;
  --bs-accordion-active-bg: #eef7ff;
  --bs-accordion-active-color: #16344c;
  --bs-accordion-btn-color: #223a4f;
  --bs-accordion-color: #324c60;
  --bs-accordion-border-radius: 0;
  margin-bottom: 0;
}

.faq-page .faq-accordion .accordion-item {
  border-left: 1px solid #dce7f0;
  border-right: 1px solid #dce7f0;
}

.faq-page .faq-accordion .accordion-item + .accordion-item {
  margin-top: 0.45rem;
}

.faq-page .faq-accordion .accordion-button {
  font-weight: 600;
  line-height: 1.45;
  box-shadow: none;
}

.faq-page .faq-accordion .accordion-button:not(.collapsed) {
  border-bottom: 1px solid #dce7f0;
}

.faq-page .faq-accordion .accordion-button:focus {
  box-shadow: 0 0 0 0.18rem rgba(15, 84, 131, 0.14);
}

.faq-page .faq-accordion .accordion-body {
  background: #fff;
  color: #445a6d !important;
}

.faq-page .faq-footer-cta {
  background: #fff;
}

.faq-question {
  border-top: 1px solid #dce7f0;
  padding-top: 1rem;
  margin-top: 1rem;
}

.event-page .event-ribbon-block,
.event-page .event-announcement-block,
.event-page .event-records-block,
.event-page .event-program-block {
  background: #fafcff;
  border: 1px solid var(--line);
  padding: 1rem 1.15rem;
  margin-bottom: 1rem;
}

.event-page .event-ribbon-block {
  background: linear-gradient(120deg, #d9efff, #eef8ff 65%, #e3f2ff);
  border-color: #d3e6f5;
  padding: 0.8rem 1rem;
}

.event-page .event-ribbon-title {
  margin: 0;
  color: #18334b;
  font-size: 1.2rem;
}

.event-page .event-announcement-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  border-bottom: 1px solid #dce7f0;
  padding-bottom: 0.75rem;
  margin-bottom: 0.8rem;
}

.event-page .event-announcement-head h3 {
  margin: 0;
  font-size: 1.35rem;
  color: #18334b;
}

.event-page .event-updated {
  color: #52687a;
  font-size: 0.92rem;
  white-space: nowrap;
}

.event-page .event-announcement-body {
  color: #2d4355;
}

.event-page .event-section-title {
  margin: 0 0 0.9rem;
  color: #18334b;
  font-size: 1.15rem;
  padding: 0.6rem 0.8rem;
  border: 1px solid #dce7f0;
  background: #fff;
}

.event-page .event-records-table {
  --bs-table-bg: transparent;
  --bs-table-striped-bg: #f5faff;
  --bs-table-striped-color: #243a4d;
  color: #2b3f52;
  border-color: #dce7f0;
}

.event-page .event-records-table thead th {
  background: #eef7ff;
  color: #1c374d;
  border-bottom-width: 1px;
}

.event-page .event-records-table th,
.event-page .event-records-table td {
  vertical-align: middle;
  text-align: center;
}

.event-page .event-record-link {
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.event-page .event-program-alert {
  border-color: #f3dd9a;
  background: #fff8df;
}

.event-page .event-tab-list {
  border-bottom: 1px solid #dce7f0;
}

.event-page .event-tab-list .nav-link {
  border: 1px solid #dce7f0;
  border-bottom: none;
  color: #254257;
  background: #f7fbff;
  margin-right: 0.35rem;
}

.event-page .event-tab-list .nav-link.active {
  background: #fff;
  color: #16344c;
  font-weight: 700;
}

.event-page #programTabContent {
  border: 1px solid #dce7f0;
  background: #fff;
  padding: 0.8rem;
}

.event-page .event-subsection-title {
  margin: 0 0 0.35rem;
  color: #1f3a50;
  font-size: 1rem;
}

.event-page .event-legend-wrap {
  margin-top: 1rem;
  border-top: 1px solid #dce7f0;
  padding-top: 0.9rem;
}

.site-footer {
  background: var(--brand-blue);
  color: #fff;
  margin-top: 2rem;
  padding: 2rem 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 1.2rem;
  padding: 0 0.8rem;
}

.footer-brand h2 {
  color: #fff;
  margin: 0 0 0.5rem;
  font-size: 1.2rem;
}

.footer-brand p,
.footer-meta p {
  margin: 0.25rem 0;
}

.footer-brand .small {
  color: #d6e9f7;
  font-size: 0.86rem;
  max-width: 520px;
}

.footer-meta {
  text-align: right;
  color: #d6e9f7;
  margin-top: 40px;
  font-size: 0.92rem;
}

.contact .contact-ribbon-block,
.contact .contact-category-block,
.contact .contact-footer-cta {
  background: #fafcff;
  border: 1px solid var(--line);
  padding: 1rem 1.15rem;
  margin-bottom: 1rem;
}

.contact .contact-ribbon-block {
  background: linear-gradient(120deg, #d9efff, #eef8ff 65%, #e3f2ff);
  border-color: #d3e6f5;
  padding: 0.8rem 1rem;
}

.contact .contact-category-block-head {
  color: #2d4355;
  border-bottom: 1px solid #dce7f0;
}

.contact .contact-category-block-body {
  color: #2d4355;
}

@media (max-width: 991px) {
  .main-nav .container {
    flex-direction: column;
    align-items: flex-start;
  }

  .main-nav-list {
    width: 100%;
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 0.35rem;
  }

  .main-nav-list a {
    white-space: nowrap;
  }

  .hero-copy {
    margin: 0;
    max-width: 100%;
    padding-top: 3rem;
  }

  .hero-copy h1 {
    font-size: 1.65rem;
  }

  .home-grid {
    grid-template-columns: 1fr;
  }

  .theme-grid {
    grid-template-columns: 1fr;
  }

}

@media (max-width: 767px) {
  .utility-inner {
    flex-direction: column;
    gap: 0.1rem;
    align-items: flex-start;
  }

  .hero-panel {
    min-height: 270px;
  }

  .hero-bubbles {
    display: none;
  }

  .hero-copy {
    padding: 2rem 1.1rem 1.6rem;
  }

  .page-header-section .container,
  .page-content {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .event-page .event-announcement-head {
    flex-direction: column;
    gap: 0.4rem;
  }

  .event-page .event-updated {
    white-space: normal;
  }

  .hero-meta {
    font-size: 0.9rem;
  }

  .panel h2 {
    font-size: 1.24rem;
  }

  .footer-inner {
    flex-direction: column;
  }

  .footer-meta {
    text-align: left;
  }
}