:root {
  --bg: #f4f7fb;
  --surface: rgba(255, 255, 255, 0.9);
  --surface-strong: #ffffff;
  --line: rgba(31, 66, 120, 0.12);
  --line-strong: rgba(31, 66, 120, 0.2);
  --text: #17314f;
  --muted: #5e7494;
  --primary: #245e98;
  --primary-soft: #e9f2fb;
  --accent: #1d8f84;
  --accent-soft: #e7f6f4;
  --shadow: 0 18px 48px rgba(26, 55, 96, 0.12);
  --radius: 24px;
  --radius-sm: 18px;
  --container: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(47, 125, 196, 0.15), transparent 26%),
    radial-gradient(circle at top right, rgba(29, 143, 132, 0.12), transparent 24%),
    linear-gradient(180deg, #f9fbfe 0%, #f1f5fa 100%);
}

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

code {
  padding: 2px 6px;
  border-radius: 8px;
  background: var(--primary-soft);
  color: var(--primary);
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.94em;
}

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

.container {
  width: min(var(--container), calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(16px);
  background: rgba(249, 251, 254, 0.86);
  border-bottom: 1px solid var(--line);
}

.nav-wrap {
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  font-size: 1.34rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.brand-mark {
  width: 112px;
  height: 112px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 0;
  color: #fff;
  background: transparent;
  box-shadow: none;
}

.brand-mark img {
  width: 109px;
  height: 109px;
  object-fit: contain;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.nav-toggle,
.nav-submenu-toggle {
  display: none;
  border: 0;
  background: transparent;
  color: var(--primary);
  cursor: pointer;
}

.nav-submenu-toggle[hidden] {
  display: none !important;
}

.nav-toggle {
  width: 46px;
  height: 46px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.9);
}

.nav-toggle span {
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background: currentColor;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle.is-open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.is-open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.is-open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-nav a,
.nav-dropdown-trigger > a {
  padding: 10px 14px;
  border-radius: 999px;
  color: var(--muted);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
}

.site-nav a:hover,
.site-nav a.is-active,
.nav-dropdown:hover .nav-dropdown-trigger > a,
.nav-dropdown-trigger > a.is-active {
  color: var(--primary);
  background: var(--primary-soft);
}

.nav-dropdown {
  position: relative;
}

.nav-dropdown-trigger {
  display: flex;
  align-items: center;
}

.nav-submenu {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 160px;
  display: none;
  padding: 8px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid var(--line);
  box-shadow: 0 16px 36px rgba(26, 55, 96, 0.12);
  z-index: 100;
}

.nav-submenu a {
  width: 100%;
  border-radius: 12px;
}

.nav-dropdown:hover .nav-submenu {
  display: grid;
  gap: 6px;
}

.hero,
.page-hero {
  padding: 56px 0 28px;
}

.hero-home {
  min-height: calc(100vh - 78px);
  display: flex;
  align-items: center;
  background:
    linear-gradient(rgba(16, 37, 63, 0.34), rgba(16, 37, 63, 0.34)),
    url("images/frankfurt-sunset-main.jpg") center/cover no-repeat;
}

.hero-home .panel {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(255, 255, 255, 0.88));
}

.hero-grid,
.two-col,
.news-layout {
  display: grid;
  gap: 24px;
}

.hero-grid {
  grid-template-columns: minmax(0, 1.4fr) minmax(320px, 0.8fr);
}

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

.panel,
.content-block,
.program-day,
.news-card {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(255, 255, 255, 0.88));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.panel,
.content-block,
.program-day {
  padding: 28px;
}

.hero-copy {
  padding: 36px;
}

.hero-side {
  align-self: center;
}

.tag,
.section-kicker {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

h1,
h2,
h3,
h4,
p {
  margin-top: 0;
}

h1 {
  margin: 18px 0 16px;
  font-size: clamp(1.2rem, 3vw, 2.15rem);
  line-height: 1.02;
  letter-spacing: -0.04em;
}

h2 {
  margin: 16px 0 14px;
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.hero-side h2 {
  font-size: clamp(1.1rem, 2vw, 1.5rem);
}

h3 {
  margin-bottom: 10px;
  font-size: 1.5rem;
}

.lead,
.body-text,
.section-intro,
.block-head p,
.person-card p,
.logo-card p,
.committee-card span,
.timeline-item span,
.news-card p,
.day-head p {
  color: var(--muted);
  line-height: 1.75;
}

.narrow {
  max-width: 760px;
}

.meta-row,
.action-row,
.stack-list,
.timeline,
.feature-grid,
.logo-grid,
.people-grid,
.committee-grid,
.clean-list,
.info-columns,
.poster-notes,
.contact-grid {
  display: grid;
  gap: 14px;
}

.meta-row {
  margin: 24px 0 0;
  display: flex;
  flex-wrap: wrap;
}

.meta-pill {
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.84);
  border: 1px solid var(--line);
  color: var(--text);
  font-weight: 600;
}

.action-row {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
}

.button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 18px;
  border-radius: 14px;
  font-weight: 700;
}

.button-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--accent));
}

.button-secondary {
  background: #fff;
  border: 1px solid var(--line-strong);
}

.section {
  padding: 28px 0;
}

.section-heading {
  margin-bottom: 22px;
}

.content-block + .content-block,
.program-day + .program-day {
  margin-top: 24px;
}

.callout-banner,
.text-card,
.interest-box,
.info-panel {
  border-radius: var(--radius-sm);
  border: 1px solid rgba(31, 66, 120, 0.08);
}

.callout-banner {
  margin-top: 16px;
  padding: 22px 24px;
  background: linear-gradient(135deg, rgba(36, 94, 152, 0.1), rgba(29, 143, 132, 0.08));
}

.callout-label {
  display: inline-block;
  margin-bottom: 10px;
  color: var(--primary);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.callout-banner h4,
.text-card h4,
.interest-box h4,
.info-panel h4 {
  margin: 0 0 10px;
  font-size: 1.18rem;
}

.callout-banner p,
.text-card p,
.interest-box p,
.info-panel p,
.number-list,
.bullet-list {
  color: var(--muted);
  line-height: 1.75;
}

.info-columns {
  margin-top: 16px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.info-panel,
.text-card,
.interest-box {
  padding: 20px 22px;
  background: rgba(255, 255, 255, 0.86);
}

.highlight-panel {
  background: linear-gradient(180deg, rgba(233, 242, 251, 0.9), rgba(231, 246, 244, 0.7));
}

.interest-box,
.text-card {
  margin-top: 16px;
}

.number-list,
.bullet-list {
  margin: 0;
  padding-left: 22px;
}

.inline-link {
  color: var(--primary);
  font-weight: 700;
}

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

.compact-grid {
  display: grid;
  gap: 12px;
  margin-top: 16px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.compact-panel {
  padding: 16px 18px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid rgba(31, 66, 120, 0.08);
}

.compact-panel h4 {
  margin: 0 0 8px;
  font-size: 1.02rem;
}

.compact-panel p,
.compact-list {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
  font-size: 0.96rem;
}

.compact-hero {
  background: linear-gradient(135deg, rgba(36, 94, 152, 0.1), rgba(29, 143, 132, 0.08));
}

.compact-span-2 {
  grid-column: span 2;
}

.compact-list {
  padding-left: 18px;
}

.contact-grid {
  margin-top: 16px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.contact-card {
  padding: 20px 22px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid rgba(31, 66, 120, 0.08);
}

.contact-card h4 {
  margin: 0 0 10px;
  font-size: 1.18rem;
}

.contact-card p {
  color: var(--muted);
  line-height: 1.75;
}

.venue-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.hotel-list {
  display: grid;
  gap: 16px;
  margin-top: 16px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.hotel-card {
  padding: 20px 22px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid rgba(31, 66, 120, 0.08);
}

.hotel-photo {
  width: 100%;
  height: 220px;
  margin-bottom: 16px;
  border-radius: 16px;
  object-fit: cover;
  background: #eef4fb;
}

.hotel-card h4 {
  margin: 0 0 10px;
  font-size: 1.18rem;
}

.hotel-card p,
.detail-list {
  color: var(--muted);
  line-height: 1.75;
}

.map-card {
  margin-top: 18px;
  padding: 20px 22px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid rgba(31, 66, 120, 0.08);
}

.map-card h4 {
  margin: 0 0 12px;
  font-size: 1.18rem;
}

.map-frame {
  overflow: hidden;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: #eef4fb;
}

.map-frame iframe {
  display: block;
  width: 100%;
  height: 420px;
  border: 0;
}

.feature-grid {
  margin-top: 20px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.feature-chip,
.timeline-item,
.committee-card,
.info-box {
  padding: 16px 18px;
  border-radius: var(--radius-sm);
  background: rgba(245, 249, 254, 0.88);
  border: 1px solid rgba(31, 66, 120, 0.08);
}

.info-label,
.person-role,
.news-date {
  display: block;
  margin-bottom: 6px;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.logo-grid {
  margin-top: 16px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.host-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.logo-grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.coorg-grid .logo-card h4 {
  font-size: 0.95rem;
  line-height: 1.45;
  min-height: 4.8em;
}

.coorg-grid .logo-card img {
  height: 145px;
}

.sponsorship-grid {
  grid-template-columns: minmax(220px, 320px);
  justify-content: start;
}

.sponsorship-grid .logo-card img {
  height: 145px;
}

.logo-card,
.person-card {
  overflow: hidden;
  border-radius: 20px;
  background: var(--surface-strong);
  border: 1px solid var(--line);
}

.logo-card img,
.person-card img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  background:
    linear-gradient(135deg, rgba(36, 94, 152, 0.14), rgba(29, 143, 132, 0.14)),
    #eef4fb;
}

.logo-card img {
  object-fit: contain;
  padding: 16px;
  background: #ffffff;
}

.logo-card img.logo-scale-two-thirds {
  width: 66.6667%;
  margin-left: auto;
  margin-right: auto;
}

#speakers .person-card img,
.committee-people-grid .person-card img {
  object-fit: contain;
  padding: 12px;
  background: #ffffff;
}

.logo-card h4,
.logo-card p,
.person-body {
  padding-left: 18px;
  padding-right: 18px;
}

.logo-card h4 {
  margin: 16px 0 8px;
  font-size: 1rem;
  line-height: 1.5;
  text-align: center;
  min-height: 3.2em;
}

.logo-card p {
  padding-bottom: 18px;
}

.people-grid {
  margin-top: 16px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.person-body {
  padding-top: 16px;
  padding-bottom: 18px;
  text-align: center;
}

.committee-grid {
  margin-top: 16px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.committee-people-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.committee-people-grid {
  gap: 12px;
}

.committee-person-card {
  border-radius: 0;
  border: none;
  box-shadow: none;
  background: transparent;
}

.committee-people-grid .person-card img {
  height: 180px;
  padding: 4px;
  border-radius: 16px;
  background: #ffffff;
}

.committee-people-grid .person-body h4 {
  margin: 0 0 4px;
  font-size: 0.9rem;
  line-height: 1.35;
}

.committee-people-grid .person-body {
  padding: 10px 8px 6px;
}

.committee-people-grid .person-body p {
  margin: 0;
  font-size: 0.78rem;
  line-height: 1.4;
}

.committee-card p {
  margin-bottom: 8px;
  font-weight: 700;
  color: var(--text);
}

.news-layout {
  grid-template-columns: minmax(0, 1.5fr) minmax(280px, 0.7fr);
  align-items: start;
}

.news-main {
  display: grid;
  gap: 20px;
}

.news-card {
  padding: 26px;
}

.news-card a {
  color: var(--primary);
  font-weight: 700;
}

.news-expand {
  margin-top: 14px;
}

.news-expand summary {
  display: inline-flex;
  align-items: center;
  cursor: pointer;
  color: var(--primary);
  font-weight: 700;
  list-style: none;
}

.news-expand summary::-webkit-details-marker {
  display: none;
}

.news-expand summary::after {
  content: "+";
  margin-left: 8px;
  font-size: 1rem;
  line-height: 1;
}

.news-expand[open] summary::after {
  content: "-";
}

.news-expand-body {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.clean-list {
  padding-left: 18px;
  margin: 0;
  color: var(--muted);
}

.small {
  font-size: 0.95rem;
}

.schedule-table {
  margin-top: 18px;
  border: 1px solid var(--line);
  border-radius: 20px;
  overflow: hidden;
}

.schedule-row {
  display: grid;
  grid-template-columns: 180px 1fr 1.2fr;
}

.schedule-row > div {
  padding: 16px 18px;
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--line);
}

.schedule-row > div:not(:last-child) {
  border-right: 1px solid var(--line);
}

.schedule-header > div {
  background: var(--primary-soft);
  color: var(--primary);
  font-weight: 700;
}

.helper-panel {
  margin-top: 24px;
}

.program-section + .program-section {
  margin-top: 24px;
}

.program-section-head {
  margin-bottom: 14px;
}

.program-section-head p,
.program-note p {
  color: var(--muted);
  line-height: 1.75;
}

.program-note {
  margin-top: 24px;
  padding: 18px 20px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(233, 242, 251, 0.9), rgba(231, 246, 244, 0.7));
  border: 1px solid rgba(31, 66, 120, 0.08);
}

.program-note strong,
.program-note span {
  display: block;
}

.program-note strong {
  margin-bottom: 6px;
  font-size: 1.05rem;
}

.program-note span {
  margin-bottom: 8px;
  color: var(--primary);
  font-weight: 700;
}

.parallel-wrap {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin-top: 24px;
}

.archive-grid {
  margin-top: 8px;
}

.archive-actions {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.detail-paragraph {
  margin: 0;
  color: var(--muted);
  line-height: 1.75;
}

.topic-note {
  margin: -4px 0 14px;
  color: var(--muted);
  font-size: 0.96rem;
}

.previous-inline {
  margin-top: 16px;
}

.previous-inline p {
  margin: 0;
}

.hero-home .panel h2 {
  font-size: clamp(1.35rem, 2.2vw, 1.75rem);
}

.closing-note {
  margin-top: 20px;
}

.site-footer {
  padding: 20px 0 40px;
}

.footer-wrap {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

@media (max-width: 1080px) {
  .hero-grid,
  .two-col,
  .news-layout,
  .logo-grid,
  .logo-grid-4,
  .people-grid,
  .committee-grid,
  .info-columns,
  .poster-notes,
  .compact-grid,
  .contact-grid,
  .parallel-wrap,
  .venue-grid,
  .hotel-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .nav-wrap,
  .footer-wrap,
  .hero-grid,
  .two-col,
  .news-layout,
  .feature-grid,
  .logo-grid,
  .logo-grid-4,
  .people-grid,
  .committee-grid,
  .info-columns,
  .poster-notes,
  .compact-grid,
  .contact-grid,
  .parallel-wrap,
  .venue-grid,
  .hotel-list,
  .schedule-row {
    grid-template-columns: 1fr;
  }


  .nav-wrap,
  .footer-wrap {
    display: grid;
  }

  .nav-wrap {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 10px 0 12px;
  }

  .hero-home {
    min-height: auto;
  }

  .hero,
  .page-hero,
  .section {
    padding: 22px 0;
  }

  .panel,
  .content-block,
  .program-day,
  .news-card,
  .hero-copy {
    padding: 22px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    display: none;
    width: 100%;
    grid-column: 1 / -1;
    margin-top: 8px;
    padding: 12px;
    gap: 8px;
    border-radius: 20px;
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.96);
    box-shadow: 0 12px 30px rgba(26, 55, 96, 0.1);
  }

  .site-nav.is-open {
    display: grid;
  }

  .site-nav a {
    width: 100%;
    padding: 12px 14px;
    border-radius: 14px;
    font-size: 0.95rem;
  }

  .nav-dropdown {
    width: 100%;
  }

  .nav-dropdown-trigger {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 8px;
    align-items: center;
  }

  .nav-dropdown-trigger > a {
    min-width: 0;
  }

  .nav-submenu-toggle {
    display: inline-flex !important;
    align-items: center;
    justify-content: center;
    width: 44px;
    min-height: 44px;
    border-radius: 14px;
    border: 1px solid var(--line);
    background: rgba(233, 242, 251, 0.8);
  }

  .nav-submenu-toggle::before,
  .nav-submenu-toggle::after {
    content: "";
    position: absolute;
    width: 12px;
    height: 2px;
    border-radius: 999px;
    background: currentColor;
    transition: transform 0.2s ease, opacity 0.2s ease;
  }

  .nav-submenu-toggle {
    position: relative;
  }

  .nav-submenu-toggle::after {
    transform: rotate(90deg);
  }

  .nav-dropdown.is-open .nav-submenu-toggle::after {
    opacity: 0;
  }

  .nav-submenu {
    position: static;
    display: none;
    min-width: 0;
    margin-top: 6px;
    padding: 6px;
    border-radius: 16px;
    box-shadow: none;
    background: rgba(244, 247, 251, 0.96);
  }

  .nav-dropdown:hover .nav-submenu,
  .nav-dropdown.is-open .nav-submenu {
    display: grid;
    gap: 6px;
  }

  .nav-submenu a {
    padding-left: 16px;
  }

  .brand-mark {
    width: 91px;
    height: 91px;
  }

  .brand-mark img {
    width: 88px;
    height: 88px;
  }

  .brand {
    min-width: 0;
    font-size: 1.16rem;
  }

  .schedule-row > div {
    border-right: none;
  }
}