:root {
  --ink: #1e293b;
  --muted: #64748b;
  --line: #dbe3ec;
  --surface: #ffffff;
  --surface-soft: #f5f8fb;
  --brand: #155e75;
  --brand-dark: #0e4b5f;
  --accent: #b45309;
  --danger: #b42318;
  --danger-bg: #fff1f0;
  --shadow: 0 14px 34px rgba(15, 23, 42, 0.08);
  --radius: 14px;
  --content: 1100px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--surface);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Yu Gothic", "YuGothic", Meiryo, sans-serif;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

.container {
  width: min(calc(100% - 40px), var(--content));
  margin-inline: auto;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}

.header-inner {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.site-brand {
  display: inline-flex;
  flex-direction: column;
  text-decoration: none;
  line-height: 1.25;
  white-space: nowrap;
}

.site-brand-main {
  font-weight: 800;
  letter-spacing: 0.04em;
}

.site-brand-sub {
  margin-top: 3px;
  color: var(--brand);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.global-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 2px;
  font-size: 0.82rem;
  font-weight: 700;
}

.global-nav a {
  padding: 10px 8px;
  border-radius: 7px;
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease;
}

.global-nav a:hover,
.global-nav a:focus-visible,
.global-nav a.is-current {
  color: var(--brand);
  background: #eef7f8;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  cursor: pointer;
}

.nav-toggle span:not(.sr-only) {
  display: block;
  height: 2px;
  margin: 5px 0;
  background: var(--ink);
}

.hero {
  position: relative;
  overflow: hidden;
  color: white;
  background: linear-gradient(135deg, #0f5368 0%, #155e75 58%, #2b7a8d 100%);
}

.hero::after {
  content: "";
  position: absolute;
  width: 360px;
  height: 360px;
  right: -100px;
  top: -180px;
  border: 70px solid rgba(255, 255, 255, 0.08);
  border-radius: 50%;
}

.hero-inner {
  position: relative;
  z-index: 1;
  padding-block: 72px 62px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 8px;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.eyebrow {
  color: #d8f2f6;
}

.hero h1 {
  max-width: 850px;
  margin: 0;
  font-size: clamp(2rem, 4.7vw, 3.8rem);
  line-height: 1.28;
  letter-spacing: 0.02em;
}

.event-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 30px;
  margin-top: 34px;
}

.event-meta p {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 10px;
}

.meta-label {
  display: inline-block;
  padding: 3px 9px;
  border: 1px solid rgba(255,255,255,0.45);
  border-radius: 999px;
  color: #e8f6f8;
  font-size: 0.72rem;
  font-weight: 700;
}

.page-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 54px;
  padding-block: 64px 80px;
}

.section-block + .section-block {
  margin-top: 64px;
}

.section-heading {
  margin-bottom: 24px;
}

.section-heading.compact {
  margin-bottom: 16px;
}

.section-kicker {
  color: var(--brand);
}

.section-heading h2 {
  margin: 0;
  font-size: 1.7rem;
  line-height: 1.3;
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.guide-card {
  min-height: 110px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 16px;
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  text-decoration: none;
  box-shadow: 0 3px 12px rgba(15, 23, 42, 0.03);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.guide-card:hover,
.guide-card:focus-visible {
  transform: translateY(-2px);
  border-color: #94c3cd;
  box-shadow: var(--shadow);
}

.guide-no {
  color: var(--brand);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.guide-title {
  font-size: 1.05rem;
  font-weight: 800;
}

.guide-arrow {
  color: var(--brand);
  font-size: 1.3rem;
}

.deadline-list {
  display: grid;
  gap: 12px;
}

.deadline-card {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: center;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface-soft);
}

.deadline-label,
.deadline-date {
  margin: 0;
}

.deadline-label {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}

.deadline-date {
  margin-top: 2px;
  font-weight: 800;
}

.deadline-action {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 5px;
}

.status {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 800;
}

.status-closed {
  color: var(--danger);
  background: var(--danger-bg);
}

.text-link {
  color: var(--brand);
  font-weight: 700;
}

.closed-link,
.disabled-link {
  color: var(--muted);
  font-size: 0.86rem;
  text-decoration: line-through;
}

.onsite-note {
  margin: 18px 0 0;
  padding: 14px 16px;
  border-left: 4px solid var(--accent);
  background: #fff8ed;
  font-weight: 800;
}

.news-panel {
  align-self: start;
  position: sticky;
  top: 106px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-soft);
}

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

.news-list li {
  padding: 15px 0;
  border-top: 1px solid var(--line);
}

.news-list li:first-child {
  border-top: 0;
  padding-top: 0;
}

.news-list time {
  display: block;
  color: var(--brand);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.news-list p {
  margin: 3px 0 0;
  font-size: 0.92rem;
  line-height: 1.6;
}

.site-footer {
  color: #d8e6ea;
  background: #153642;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 36px;
  padding-block: 34px;
  font-size: 0.84rem;
}

.footer-inner p {
  margin: 4px 0;
}

.copyright {
  align-self: end;
  color: #a9c0c7;
  text-align: right;
}

.mobile-only {
  display: none;
}

@media (max-width: 960px) {
  .nav-toggle {
    display: block;
  }

  .global-nav {
    display: none;
    position: absolute;
    left: 20px;
    right: 20px;
    top: 68px;
    flex-direction: column;
    align-items: stretch;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: white;
    box-shadow: var(--shadow);
  }

  .global-nav.is-open {
    display: flex;
  }

  .global-nav a {
    padding: 10px 12px;
  }

  .page-grid {
    grid-template-columns: 1fr;
    gap: 52px;
  }

  .news-panel {
    position: static;
  }
}

@media (max-width: 680px) {
  .container {
    width: min(calc(100% - 28px), var(--content));
  }

  .header-inner {
    min-height: 68px;
  }

  .site-brand-main {
    font-size: 0.92rem;
  }

  .site-brand-sub {
    font-size: 0.72rem;
  }

  .hero-inner {
    padding-block: 50px 44px;
  }

  .mobile-only {
    display: inline;
  }

  .event-meta {
    display: grid;
    gap: 14px;
  }

  .event-meta p {
    align-items: flex-start;
  }

  .page-grid {
    padding-block: 46px 60px;
  }

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

  .deadline-card {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .deadline-action {
    align-items: flex-start;
  }

  .news-panel {
    padding: 22px;
  }

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

  .copyright {
    align-self: auto;
    text-align: left;
  }
}
/* ===== Conference detail pages ===== */

.conference-subnav {
  border-bottom: 1px solid var(--line);
  background: var(--surface-soft);
}

.conference-subnav-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-block: 14px;
}

.conference-subnav a {
  padding: 7px 12px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 700;
  text-decoration: none;
}

.conference-subnav a:hover,
.conference-subnav a:focus-visible,
.conference-subnav a.is-current {
  color: var(--brand);
  background: var(--surface);
  box-shadow: 0 0 0 1px var(--line);
}

.subpage-hero .hero-inner {
  padding-block: 48px 42px;
}

.subpage-hero h1 {
  font-size: clamp(1.9rem, 4vw, 3rem);
}

.hero-parent {
  margin: 0 0 8px;
  color: #d8f2f6;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.content-wrap {
  max-width: 900px;
  padding-block: 56px 80px;
}

.content-section + .content-section {
  margin-top: 46px;
}

.content-section h2 {
  margin: 0 0 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--brand);
  font-size: 1.35rem;
  line-height: 1.4;
}

.content-section h3 {
  margin: 26px 0 8px;
  font-size: 1.05rem;
}

.info-card {
  padding: 24px 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 4px 16px rgba(15, 23, 42, 0.04);
}

.info-card + .info-card {
  margin-top: 14px;
}

.info-card p {
  margin: 6px 0;
}

.info-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.info-list li {
  padding: 16px 18px;
  border-left: 4px solid var(--brand);
  border-radius: 0 10px 10px 0;
  background: var(--surface-soft);
}

.fee-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 18px;
}

.fee-card {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface-soft);
}

.fee-card h3 {
  margin: 0 0 6px;
  font-size: 0.96rem;
}

.fee-card p {
  margin: 0;
}

.document-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.document-links a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 9px;
  color: var(--brand);
  background: var(--surface);
  font-weight: 800;
  text-decoration: none;
}

.document-links a:hover,
.document-links a:focus-visible {
  border-color: var(--brand);
  background: var(--surface-soft);
}

.notice-box {
  padding: 20px 22px;
  border-left: 5px solid var(--accent);
  border-radius: 0 12px 12px 0;
  background: #fff8eb;
}

.notice-box h2,
.notice-box h3 {
  margin-top: 0;
}

.notice-box p {
  margin: 6px 0;
}

.schedule-outline {
  display: grid;
  gap: 10px;
}

.schedule-item {
  padding: 17px 20px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
}

.schedule-item h3 {
  margin: 0;
  font-size: 1rem;
}

.schedule-item p {
  margin: 5px 0 0;
  color: var(--muted);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 26px;
  color: var(--brand);
  font-weight: 800;
  text-decoration: none;
}

.back-link:hover,
.back-link:focus-visible {
  text-decoration: underline;
  text-underline-offset: 3px;
}

@media (max-width: 680px) {
  .content-wrap {
    padding-block: 40px 56px;
  }

  .conference-subnav-inner {
    gap: 4px;
  }

  .conference-subnav a {
    padding: 6px 9px;
    font-size: 0.78rem;
  }

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

  .info-card {
    padding: 20px;
  }

  .document-links {
    flex-direction: column;
    align-items: stretch;
  }

  .document-links a {
    justify-content: space-between;
  }
}
/* ===== Access page ===== */
.access-route-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.access-route {
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
}

.access-route h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.access-route p {
  margin: 4px 0;
}

.access-route strong {
  color: var(--brand);
}

.map-link-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface-soft);
  text-decoration: none;
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.map-link-card + .map-link-card {
  margin-top: 10px;
}

.map-link-card:hover,
.map-link-card:focus-visible {
  transform: translateY(-1px);
  border-color: var(--brand);
  box-shadow: 0 8px 22px rgba(15, 23, 42, 0.07);
}

.map-link-card strong {
  display: block;
  margin-bottom: 2px;
}

.map-link-card span {
  color: var(--muted);
  font-size: 0.9rem;
}

.map-link-arrow {
  flex: 0 0 auto;
  color: var(--brand) !important;
  font-size: 1.35rem !important;
  font-weight: 800;
}

.venue-address {
  font-style: normal;
}

@media (max-width: 680px) {
  .access-route-grid {
    grid-template-columns: 1fr;
  }
}
/* ===== Timetable page ===== */
.pdf-viewer-wrap {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 5px 18px rgba(15, 23, 42, 0.05);
}

.pdf-viewer {
  display: block;
  width: 100%;
  height: 760px;
  border: 0;
  background: #f4f6f8;
}

.pdf-fallback {
  margin: 0;
  padding: 14px 18px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
  background: var(--surface-soft);
}

.timetable-note {
  margin-top: 16px;
  color: var(--muted);
  font-size: 0.92rem;
}

@media (max-width: 680px) {
  .pdf-viewer {
    height: 620px;
  }
}
/* ===== Call for papers page ===== */
.call-step-grid {
  display: grid;
  gap: 16px;
}

.call-step {
  position: relative;
  padding: 24px 24px 22px 72px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.call-step-number {
  position: absolute;
  top: 22px;
  left: 22px;
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  color: #fff;
  background: var(--brand);
  font-weight: 800;
}

.call-step h3 {
  margin: 0 0 8px;
}

.deadline-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.deadline-box {
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface-soft);
}

.deadline-box .label {
  display: block;
  margin-bottom: 4px;
  color: var(--muted);
  font-size: .85rem;
  font-weight: 700;
}

.deadline-box strong {
  color: var(--brand);
  font-size: 1.2rem;
}

.action-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  padding: 10px 14px;
  border-radius: 9px;
  color: #fff;
  background: var(--brand);
  font-weight: 800;
  text-decoration: none;
}

.action-link:hover,
.action-link:focus-visible {
  background: var(--brand-dark);
}

.action-link.is-disabled {
  color: var(--muted);
  background: #edf2f4;
  cursor: default;
}

.format-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 14px;
}

.format-table th,
.format-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.format-table th {
  width: 32%;
  background: var(--surface-soft);
  font-weight: 800;
}

.reference-links {
  display: grid;
  gap: 8px;
  margin-top: 12px;
}

.reference-links a {
  color: var(--brand);
  font-weight: 700;
}

@media (max-width: 680px) {
  .call-step {
    padding: 62px 20px 20px;
  }

  .call-step-number {
    top: 18px;
    left: 20px;
  }

  .deadline-list {
    grid-template-columns: 1fr;
  }

  .format-table,
  .format-table tbody,
  .format-table tr,
  .format-table th,
  .format-table td {
    display: block;
    width: 100%;
  }

  .format-table th {
    border-bottom: 0;
  }
}