@import url('https://fonts.googleapis.com/css2?family=Libre+Caslon+Text:ital,wght@0,400;0,700;1,400&family=Noto+Sans+JP:wght@100..900&family=Noto+Serif+JP:wght@200..900&display=swap');
@import url("https://cdnjs.cloudflare.com/ajax/libs/font-awesome/7.0.1/css/all.min.css");

:root {
  --ink: #111;
  --muted: #6f6c66;
  --line: #d8d3c8;
  --warm-white: #fdfcf9;
  --nav-active: #d1cec4;
  --accent: #886915;
  --link-hover: #007268;
  --sidebar-width: 260px;
  --content-width: 1020px;
  font-synthesis: none;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--warm-white);
  font-family: "Noto Sans JP", sans-serif;
  -webkit-font-smoothing: antialiased;
}

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

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

ul,
ol,
dl,
p,
h1,
h2 {
  margin-block: 0;
}

a:after {
  font-family: "Font Awesome 7 free";
  margin-left: 0.5em;
}

a.is-external:after {
  content: "\f35d";
}

a.is-pdf:after {
  content: "\f1c1";
}

a:before {
  font-family: "Font Awesome 7 free";
  margin-right: 0.25em;
}

a[href^="mailto:"]:before {
  content: "\f0e0";
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 8px;
  left: 8px;
  padding: 10px 16px;
  color: #fff;
  background: #111;
  transform: translateY(-160%);
  transition: transform 0.2s ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.page-top-button {
  position: fixed;
  z-index: 30;
  right: 28px;
  bottom: 28px;
  display: flex;
  width: 64px;
  height: 64px;
  padding: 8px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  border: 0px solid var(--ink);
  border-radius: 50%;
  color: #fff;
  background: rgba(17, 17, 17, 0.9);
  font-family: "Libre Caslon Text", serif;
  font-size: 0.75rem;
  line-height: 1;
  letter-spacing: 0.08em;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.25s ease, visibility 0.25s ease, transform 0.25s ease, background-color 0.2s ease;
}

.page-top-button.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.page-top-button:hover,
.page-top-button:focus-visible {
  background: var(--link-hover);
}

.page-top-button:focus-visible {
  outline: 3px solid #fff;
  outline-offset: -5px;
}

.page-top-button__arrow {
  width: 10px;
  height: 10px;
  border-top: 2px solid currentColor;
  border-left: 2px solid currentColor;
  transform: rotate(45deg);
}

.mobile-header {
  display: none;
}

.page-layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  z-index: 20;
  top: 0;
  align-self: start;
  width: var(--sidebar-width);
  min-height: 100vh;
  padding: 0 20px 40px 20px;
  border-right: 1px solid var(--line);
  background: #faf9f5;
}

.sidebar__logo {
  display: block;
  width: 100%;
  margin: 0;
  padding: 24px 0;
  font-family: "Libre Caslon Text", serif;
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1.6;
  text-align: center;
  white-space: nowrap;
}

.sidebar__logo::first-line {
  font-size: 0.8em;
}

.global-nav ul {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

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

.global-nav a {
  position: relative;
  display: flex;
  align-items: center;
  margin: 20px 0;
  min-height: 28px;
  padding: 0 30px 0 8px;
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.35;
  transition: background-color 0.2s ease;
}

.global-nav a::after {
  position: absolute;
  right: 7px;
  content: "→";
  color: #8c8d88;
  font-size: 1rem;
  font-weight: 400;
}

.global-nav a[href^="#"] {
  padding-right: 54px;
}

.global-nav a[href^="#"]::after {
  content: "準備中";
  padding: 2px 4px;
  border-radius: 2px;
  background: #8c8d88;
  color: #fff;
  font-size: 0.625rem;
  line-height: 1.2;
  white-space: nowrap;
}

.global-nav a:hover,
.global-nav a:focus-visible,
.global-nav a.is-current {
  background: var(--nav-active);
}

.content-column {
  display: flex;
  min-width: 0;
  min-height: 100vh;
  flex-direction: column;
}

.main-content {
  flex: 1;
  padding: 37px 60px 70px;
}

.content-inner {
  position: relative;
  width: min(100%, var(--content-width));
  margin-inline: auto;
  transform: translateX(-20px);
}

.event-hero {
  position: relative;
  width: 100%;
}

.event-hero__art,
.event-hero__art img {
  width: 100%;
}

.event-hero__art {
  display: block;
}

.event-hero__credit {
  margin-top: 4px;
  color: var(--muted);
  font-family: Arial, sans-serif;
  font-size: 10px;
  line-height: 1.4;
  text-align: right;
}

.event-hero__credit small {
  font-size: inherit;
}

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

.event-hero h1,
.event-theme {
  position: absolute;
  left: 0;
  font-weight: 500;
}

.event-hero h1 {
  margin: 0;
  letter-spacing: 0.07em;
}

.event-number {
  display: block;
}

.event-theme {
  display: flex;
  align-items: baseline;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.event-theme span {
  margin-left: 14px;
  font-size: 1.225rem;
  letter-spacing: 0.16em;
}

.event-hero--sub .event-theme span {
  font-size: 1.1375rem;
}

.event-meta {
  margin: 0;
}

.event-meta__item {
  position: absolute;
  left: 8.35%;
  display: flex;
  flex-direction: column;
  font-weight: 700;
  line-height: 1.12;
}

.event-meta dt,
.event-meta dd {
  margin: 0;
}

.event-meta dt {
  font-size: 0.8125rem;
}

.event-meta dd {
  font-size: 1.125rem;
}

.event-meta__item--date dd {
  display: flex;
  align-items: baseline;
  letter-spacing: -0.04em;
}

.event-meta__item--date dd strong {
  font-size: 2.25rem;
  line-height: 0.95;
}

.event-meta__item--date dd small {
  margin-left: 3px;
  font-size: 1.0625rem;
}

.event-meta__item--date dd i {
  margin: 0 6px;
  font-size: 1.75rem;
  font-style: normal;
  font-weight: 400;
}

.event-meta__item--chair dd {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.event-meta__item--chair dd strong {
  font-size: 1.4375rem;
  white-space: nowrap;
}

.event-meta__item--chair dd span {
  font-size: 0.8125rem;
  white-space: nowrap;
}

.event-hero--main {
  aspect-ratio: 1100 / 640;
}

.event-hero--main h1 {
  top: 5.5%;
  width: 52%;
  font-size: clamp(2.125rem, 3.05vw, 3.1875rem);
  line-height: 1.1;
}

.event-hero--main .event-theme {
  top: 40.5%;
  font-size: 1.75rem;
}

.event-hero--main .event-meta__item--date {
  top: 55.2%;
}

.event-hero--main .event-meta__item--venue {
  top: 71.1%;
}

.event-hero--main .event-meta__item--chair {
  top: 85.4%;
}

.event-hero--sub {
  aspect-ratio: 1101 / 420;
}

.event-hero--sub h1 {
  top: 0;
  width: 62%;
  font-size: clamp(1.6875rem, 2.3vw, 2.5rem);
  line-height: 1.25;
  white-space: nowrap;
}

.event-hero--sub .event-theme {
  top: 27.5%;
  font-size: 1.625rem;
}

.event-hero--sub .event-meta__item--date {
  top: 48.7%;
}

.event-hero--sub .event-meta__item--venue {
  top: 67.2%;
}

.event-hero--sub .event-meta__item--chair {
  top: 86.2%;
}

.news,
.overview,
.greeting,
.sponsor {
  margin-top: 24px;
}

.news h2,
.overview h2,
.greeting h2,
.sponsor h2 {
  margin-bottom: 35px;
  font-family: "Noto Serif JP", serif;
  font-size: 2rem;
  font-weight: 500;
  letter-spacing: 0.12em;
}

.news-list {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.news-list li {
  display: grid;
  grid-template-columns: 100px minmax(0, 1fr);
  gap: 0;
  align-items: center;
  min-height: 64px;
  border-bottom: 1px solid var(--line);
  font-family: "Noto Serif JP", serif;
  font-size: 1rem;
}

.news-list a,
.overview-list a,
.site-footer a {
  color: var(--accent);
  text-decoration: underline;
  font-weight: 700;
  transition: color 0.2s ease;
}

a[href^="#"]:not(.skip-link) {
  color: #AAA;
}

.news-list a:hover,
.news-list a:focus-visible,
.overview-list a:hover,
.overview-list a:focus-visible,
.site-footer a:hover,
.site-footer a:focus-visible {
  color: var(--link-hover);
}

.overview-list {
  width: 100%;
  border-collapse: collapse;
  border-top: 1px solid var(--line);
}

.overview-list tr {
  
  border-bottom: 1px solid var(--line);
  font-family: "Noto Serif JP", serif;
  font-size: 1rem;
  line-height: 1.45;
}

.overview-list th,
.overview-list td {
  padding: 2em;
  vertical-align: middle;
}

.overview-list th {
 text-align: center;
  font-weight: 400;
  white-space: nowrap;
}

.greeting__body {
  font-family: "Noto Serif JP", serif;
  font-size: 1rem;
  line-height: 2.1;
}

.sponsor__body {
  font-family: "Noto Serif JP", serif;
  font-size: 1rem;
  line-height: 2.1;
}

.sponsor__body > p {
  margin-bottom: 1.5em;
}

.sponsor-actions {
  display: grid;
  max-width: 680px;
  margin: 42px auto 0;
  padding: 0;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  list-style: none;
}

.sponsor-actions a {
  display: flex;
  min-height: 64px;
  padding: 12px 20px;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  text-align: center;
  text-decoration: none;
  font-family: "Noto Sans JP", sans-serif;
  font-weight: 700;
  line-height: 1.5;
  transition: background-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.sponsor-actions a:hover,
.sponsor-actions a:focus-visible {
  transform: translateY(-3px);
  background: var(--link-hover);
  box-shadow: 0 6px 14px rgba(0, 0, 0, 0.18);
}

.greeting__note {
  margin-bottom: 25px;
  color: var(--muted);
  font-family: "Noto Sans JP", sans-serif;
  font-size: 0.8125rem;
}

.greeting__body > p:not(.greeting__note) {
  margin-bottom: 1.5em;
  text-align: justify;
}

.greeting__closing {
  display: flex;
  max-width: 620px;
  margin: 48px 0 0 auto;
  align-items: flex-end;
  justify-content: flex-end;
  gap: 35px;
}

.greeting__signature {
  flex: 1;
  padding-bottom: 10px;
  text-align: right;
}

.greeting__role,
.greeting__affiliation {
  font-size: 0.9375rem;
  line-height: 1.7;
}

.greeting__name {
  margin: 10px 0 8px;
  font-size: 1.625rem;
  font-weight: 600;
  letter-spacing: 0.18em;
}

.greeting__portrait {
  width: 210px;
  margin: 0;
  flex: 0 0 auto;
}

.greeting__portrait img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
}

.greeting__portrait figcaption {
  margin-top: 7px;
  color: var(--muted);
  font-family: "Noto Sans JP", sans-serif;
  font-size: 0.75rem;
  text-align: center;
}

.site-footer {
  padding: 30px 40px 26px;
  text-align: center;
  font-size: 0.8125rem;
  font-weight: 600;
  line-height: 1.8;
}

.site-footer__heading {
  margin-bottom: 12px;
  font-size: 0.875rem;
}

.site-footer__copyright {
  margin-top: 42px;
  color: #888;
  font-weight: 400;
}

@media (max-width: 1200px) and (min-width: 768px) {
  .main-content {
    padding-inline: 40px;
  }

  .content-inner {
    transform: none;
  }

  .event-hero--main h1 {
    font-size: 2.25rem;
  }

  .event-hero--main .event-theme,
  .event-hero--sub .event-theme {
    font-size: 1.375rem;
  }

  .event-hero--main .event-theme span,
  .event-hero--sub .event-theme span {
    font-size: 0.9625rem;
  }

  .event-meta__item--date dd strong {
    font-size: 1.8125rem;
  }

  .event-meta__item--date dd small,
  .event-meta dd {
    font-size: 0.875rem;
  }
}

@media (max-width: 767px) {
  :root {
    --mobile-gutter: 25px;
    --mobile-nav-item-margin-top: 1rem;
    --mobile-nav-item-margin-bottom: 1rem;
    --mobile-nav-item-padding-top: 0rem;
    --mobile-nav-item-padding-bottom: 0rem;
  }

  body {
    min-width: 320px;
  }

  .page-top-button {
    right: 16px;
    bottom: 16px;
    width: 54px;
    height: 54px;
    font-size: 0.6875rem;
  }

  .mobile-header {
    position: relative;
    z-index: 50;
    display: flex;
    height: 51px;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--mobile-gutter) 0 27px;
    border-bottom: 1px solid #c8c5be;
    background: var(--warm-white);
  }

  .site-logo {
    font-family: "Libre Caslon Text", serif;
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: -0.03em;
  }

  .menu-button {
    display: grid;
    width: 32px;
    height: 46px;
    padding: 7px 0 2px;
    border: 0;
    color: #111;
    background: transparent;
    cursor: pointer;
    place-items: center;
  }

  .menu-button__lines {
    display: grid;
    width: 30px;
    gap: 5px;
  }

  .menu-button__lines span {
    display: block;
    height: 1px;
    background: currentColor;
    transition: transform 0.2s ease, opacity 0.2s ease;
  }

  .menu-button__label {
    font-family: Arial, sans-serif;
    font-size: 0.625rem;
    line-height: 1;
  }

  .menu-button[aria-expanded="true"] .menu-button__lines span:first-child {
    transform: translateY(6px) rotate(45deg);
  }

  .menu-button[aria-expanded="true"] .menu-button__lines span:nth-child(2) {
    opacity: 0;
  }

  .menu-button[aria-expanded="true"] .menu-button__lines span:last-child {
    transform: translateY(-6px) rotate(-45deg);
  }

  .page-layout {
    display: block;
    min-height: calc(100vh - 51px);
  }

  .sidebar {
    position: absolute;
    z-index: 40;
    top: 51px;
    right: 0;
    left: 0;
    display: none;
    width: auto;
    min-height: 0;
    padding: 0;
    border: 0;
    background: rgba(253, 252, 249, 0.98);
    box-shadow: 0 8px 18px rgba(0, 0, 0, 0.12);
  }

  .sidebar.is-open {
    display: block;
  }

  .sidebar__logo {
    display: none;
  }

  .global-nav ul {
    border-top: 0;
  }

  .global-nav a {
    margin-top: var(--mobile-nav-item-margin-top);
    margin-bottom: var(--mobile-nav-item-margin-bottom);
    min-height: 24px;
    padding-top: var(--mobile-nav-item-padding-top);
    padding-bottom: var(--mobile-nav-item-padding-bottom);
    padding-inline: var(--mobile-gutter) 45px;
    font-size: 0.8125rem;
  }

  .global-nav a::after {
    right: var(--mobile-gutter);
  }

  .content-column {
    min-height: calc(100vh - 51px);
  }

  .main-content {
    padding: 22px var(--mobile-gutter) 24px;
  }

  .content-inner {
    width: 100%;
    transform: none;
  }

  .event-hero {
    width: 100vw;
    margin-left: calc(var(--mobile-gutter) * -1);
  }

  .event-hero__art,
  .event-hero__art img {
    width: 100vw;
    max-width: none;
  }

  .event-hero__credit {
    padding-inline: var(--mobile-gutter);
  }

  .event-hero h1,
  .event-theme {
    left: 6.4vw;
  }

  .event-hero h1 {
    top: 0;
    width: auto;
    font-size: clamp(1.0625rem, 5.1vw, 1.25rem);
    line-height: 1.2;
    letter-spacing: 0.06em;
    white-space: nowrap;
  }

  .event-number {
    display: inline;
    margin-right: 0.28em;
    font-family: "Noto Sans JP", sans-serif;
    font-size: clamp(0.690625rem, 3.315vw, 0.8125rem);
    font-weight: 600;
    letter-spacing: 0;
  }

  .desktop-only {
    display: none;
  }

  .event-theme {
    top: 8.8%;
    font-size: clamp(0.9375rem, 4.1vw, 1.0625rem);
    letter-spacing: 0.06em;
  }

  .event-hero--main .event-theme span,
  .event-hero--sub .event-theme span {
    margin-left: 8px;
    font-size: clamp(0.6375rem, 2.788vw, 0.7225rem);
    letter-spacing: 0.15em;
  }

  .event-meta__item {
    left: 21.2%;
  }

  .event-meta dt {
    font-size: clamp(0.625rem, 2.8vw, 0.75rem);
  }

  .event-meta dd {
    font-size: clamp(0.8125rem, 3.8vw, 1rem);
  }

  .event-meta__item--date dd strong {
    font-size: clamp(1.3125rem, 6.1vw, 1.5625rem);
  }

  .event-meta__item--date dd small {
    margin-left: 2px;
    font-size: clamp(0.625rem, 2.8vw, 0.75rem);
  }

  .event-meta__item--date dd i {
    margin: 0 3px;
    font-size: clamp(0.9375rem, 4vw, 1.125rem);
  }

  .event-meta__item--chair dd {
    gap: 6px;
  }

  .event-meta__item--chair dd strong {
    font-size: clamp(1rem, 4.8vw, 1.1875rem);
  }

  .event-meta__item--chair dd span {
    font-size: clamp(0.5625rem, 2.55vw, 0.6875rem);
  }

  .event-hero--main {
    aspect-ratio: 780 / 931;
  }

  .event-hero--main .event-meta__item--date {
    top: 68.1%;
  }

  .event-hero--main .event-meta__item--venue {
    top: 80.3%;
  }

  .event-hero--main .event-meta__item--chair {
    top: 91.6%;
  }

  .event-hero--sub {
    aspect-ratio: 780 / 581;
  }

  .event-hero--sub .event-theme {
    top: 10.1%;
  }

  .event-hero--sub .event-meta__item--date {
    top: 62.6%;
  }

  .event-hero--sub .event-meta__item--venue {
    top: 76.2%;
  }

  .event-hero--sub .event-meta__item--chair {
    top: 89.9%;
  }

  .news,
  .overview,
  .greeting,
  .sponsor {
    margin-top: 28px;
  }

  .news h2,
  .overview h2,
  .greeting h2,
  .sponsor h2 {
    margin-bottom: 9px;
    font-size: 1.5rem;
    letter-spacing: 0.12em;
  }

  .news-list li {
    grid-template-columns: 87px minmax(0, 1fr);
    font-size: 1rem;
    line-height: 1.6;
  }

  .overview-list tr {
  }

  .overview-list th,
  .overview-list td {
    padding: 1em;

  }

  .greeting__body {
    font-size: 0.9375rem;
    line-height: 1.95;
  }

  .sponsor__body {
    font-size: 0.9375rem;
    line-height: 1.95;
  }

  .sponsor-actions {
    margin-top: 30px;
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .sponsor-actions a {
    min-height: 56px;
  }

  .greeting__note {
    margin-bottom: 18px;
    font-size: 0.75rem;
  }

  .greeting__body > p:not(.greeting__note) {
    margin-bottom: 1.35em;
  }

  .greeting__closing {
    max-width: none;
    margin-top: 34px;
    align-items: center;
    gap: 18px;
  }

  .greeting__signature {
    padding-bottom: 0;
  }

  .greeting__role,
  .greeting__affiliation {
    font-size: 0.75rem;
  }

  .greeting__name {
    margin-block: 7px 5px;
    font-size: 1.25rem;
    letter-spacing: 0.12em;
  }

  .greeting__portrait {
    width: min(38vw, 150px);
  }

  .site-footer {
    padding: 0 20px 27px;
    line-height: 1.7;
  }

  .site-footer__heading {
    margin-bottom: 8px;
  }

  .site-footer__copyright {
    margin-top: 15px;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}