:root {
  --bg: #f6f3ee;
  --text: #1d2430;
  --muted: #667085;
  --line: #d7dde7;
  --line-strong: #c5cedb;
  --accent: #b18d5b;
  --container: 1380px;
  --nav-height: 76px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(34, 76, 137, 0.05), transparent 24%),
    radial-gradient(circle at top right, rgba(143, 50, 65, 0.04), transparent 22%),
    linear-gradient(180deg, #efeae2 0, #f8f5ef 220px, var(--bg) 100%);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.72;
}

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

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

button {
  font: inherit;
}

.container {
  width: min(calc(100% - 48px), var(--container));
  margin: 0 auto;
}

/* NAV */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  min-height: var(--nav-height);
  background: rgba(246, 243, 238, 0.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(197, 206, 219, 0.85);
}

.nav-inner {
  position: relative;
  min-height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-menu {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.nav-menu a {
  padding: 10px 14px;
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--muted);
  transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.nav-menu a:hover,
.nav-menu a.is-active {
  background: rgba(255, 255, 255, 0.88);
  color: var(--text);
}

.nav-menu a:hover {
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  margin: 5px auto;
  background: #151b25;
  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);
}

/* HEADER */

.site-header {
  padding: 42px 0 28px;
}

.intl-heading {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  text-align: center;
  max-width: 980px;
  margin: 0 auto 26px;
}

.intl-heading::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--accent);
  transform: translateX(-50%);
}

.intl-heading > span {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 130px;
  padding: 0 36px;
  font-family: "Baskerville", "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  font-size: clamp(2.4rem, 4.5vw, 4.2rem);
  line-height: 1.05;
  letter-spacing: -0.04em;
  font-weight: 700;
  color: #151b25;
}

.event-title {
  margin: 0;
  text-align: center;
  font-family: "Baskerville", "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  font-size: clamp(3.3rem, 6.5vw, 6.6rem);
  line-height: 0.95;
  letter-spacing: -0.055em;
  font-weight: 700;
  color: #151b25;
}

.theme-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  margin-top: 30px;
  padding-top: 26px;
  border-top: 1px solid var(--line-strong);
}

.theme-column {
  min-width: 0;
}

.theme-text {
  margin: 0;
  font-size: 1.08rem;
  line-height: 1.8;
  color: var(--text);
}

.logo-band {
  margin-top: 32px;
  padding: 24px 0;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.logo-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 36px;
  align-items: center;
}

.logo-item {
  margin: 0;
  min-height: 170px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.org-logo {
  max-height: 132px;
  width: auto;
  height: auto;
  object-fit: contain;
}

/* MAIN */

.site-main {
  padding: 18px 0 64px;
}

.dual-section {
  scroll-margin-top: calc(var(--nav-height) + 24px);
  padding: 34px 0 40px;
  margin-top: 100px;
}

.dual-section:first-child {
  padding-top: 0;
}

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

.section-title-pair {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  align-items: center;
}

.section-title-pair::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 12%;
  bottom: 12%;
  width: 1px;
  background: var(--line-strong);
  transform: translateX(-50%);
}

.section-title-pair > span {
  display: block;
  text-align: center;
  font-family: "Baskerville", "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  font-size: clamp(1.7rem, 2.7vw, 2.4rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
  font-weight: 700;
  color: #151b25;
}

.dual-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 72px;
}

.dual-grid::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  background: linear-gradient(180deg, transparent, var(--line-strong), transparent);
}

.language-block {
  min-width: 0;
}

.language-block p {
  margin: 0;
  color: var(--text);
}

.schedule-list,
.price-list,
.topic-list,
.bullet-list,
.name-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.schedule-list li,
.name-list li {
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  color: var(--text);
}

.schedule-list li strong {
  color: #151b25;
  font-weight: 700;
}

.price-list li {
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.price-list li strong {
  text-align: right;
  color: #151b25;
  font-weight: 700;
}

.topic-list {
  counter-reset: item;
}

.topic-list li {
  position: relative;
  padding: 12px 0 12px 50px;
  border-bottom: 1px solid var(--line);
}

.topic-list li::before {
  counter-increment: item;
  content: counter(item) ".";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  font-family: "Baskerville", "Iowan Old Style", Georgia, serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
}

.bullet-list li {
  position: relative;
  padding: 12px 0 12px 18px;
  border-bottom: 1px solid var(--line);
}

.bullet-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
}

.meta-item {
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.meta-item + .meta-item,
.committee-group + .committee-group {
  margin-top: 18px;
}

.meta-item span,
.committee-group h3 {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.asterisk {
  display: inline;
  color: #c62828;
}

.footnote {
  margin-top: 16px;
}

/* RESPONSIVE */

@media (max-width: 1180px) {
  .theme-grid,
  .section-title-pair,
  .dual-grid {
    grid-template-columns: 1fr;
  }

  .section-title-pair::before,
  .dual-grid::before {
    display: none;
  }

  .dual-grid {
    gap: 34px;
  }

  .language-block + .language-block {
    padding-top: 10px;
    border-top: 1px solid var(--line);
  }
}

@media (max-width: 900px) {
  .nav-inner {
    padding: 14px 0;
  }

  .nav-toggle {
    display: block;
    box-shadow: 0 8px 20px rgba(21, 27, 37, 0.06);
    border-radius: 14px;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: calc(100% - 6px);
    left: 0;
    right: 0;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
    padding: 10px;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.95);
    border: 1px solid rgba(197, 206, 219, 0.95);
    box-shadow: 0 18px 40px rgba(21, 27, 37, 0.1);
  }

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

  .nav-menu a {
    padding: 12px 14px;
    border-radius: 14px;
  }
}

@media (max-width: 760px) {
  .container {
    width: min(calc(100% - 28px), var(--container));
  }

  .site-header {
    padding-top: 26px;
  }

  .intl-heading {
    grid-template-columns: 1fr;
    gap: 12px;
    margin-bottom: 18px;
  }

  .intl-heading::before {
    display: none;
  }

  .intl-heading > span {
    min-height: auto;
    padding: 0;
    font-size: clamp(1.9rem, 8vw, 2.8rem);
  }

  .event-title {
    font-size: clamp(2.5rem, 10vw, 4.5rem);
  }

  .theme-grid {
    gap: 24px;
  }

  .logo-row {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .logo-item {
    min-height: 120px;
  }

  .org-logo {
    max-height: 92px;
  }

}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .nav-menu a,
  .nav-toggle span {
    transition: none;
  }
}

.venue-map {
  margin-top: 32px;
  border: 1px solid var(--line-strong);
  border-radius: 20px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.72);
}

.venue-map iframe {
  display: block;
  width: 100%;
  height: 340px;
  border: 0;
}

@media (max-width: 760px) {
  .venue-map {
    margin-top: 24px;
    border-radius: 16px;
  }

  .venue-map iframe {
    height: 280px;
  }
}