@charset "UTF-8";
/* =========================================================
   第76回日本口腔衛生学会学術大会 (jsoh76)
   配色はトップ画像（ホームページ用.ai）から採色
   - 紺   : 大会名・下帯   #0a2e59 / #12325f
   - 青   : 流れ（波）     #306599 / #3c83bd
   - 空色 : 背景の空       #a9c4da / #d9eaf5 / #f1f5f8
   - 金   : 街の灯り・光   #c9a65a（差し色のみ）
   ========================================================= */

:root {
  --navy-900: #0a2e59;
  --navy-800: #12325f;
  --navy-700: #16396e;
  --blue-600: #306599;
  --blue-500: #3c83bd;
  --sky-300: #a9c4da;
  --sky-200: #d9eaf5;
  --sky-100: #eaf3fa;
  --sky-50: #f4f8fb;
  --gold: #c9a65a;
  --ink: #1c2a3d;
  --muted: #5d6b80;
  --line: #d5e2ee;
  --font-sans: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
  --font-mincho: 'Shippori Mincho B1', 'Hiragino Mincho ProN', 'Yu Mincho', serif;
  --font-en: 'Cormorant Garamond', 'Times New Roman', serif;
  --font-num: 'Barlow', 'Helvetica Neue', Arial, sans-serif;
  --wave: linear-gradient(90deg, var(--navy-900) 0%, var(--blue-600) 45%, var(--blue-500) 70%, var(--sky-300) 100%);
}

/* ---------- base ---------- */
html {
  scroll-behavior: smooth;
}
body {
  margin: 0 auto;
  padding: 0 !important;
  max-width: 1080px;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.85;
  letter-spacing: 0.04em;
  color: var(--ink);
  background-color: var(--sky-50);
  background-image:
    radial-gradient(1200px 500px at 85% -10%, rgba(169, 196, 218, 0.55), transparent 70%),
    radial-gradient(900px 600px at -10% 110%, rgba(60, 131, 189, 0.12), transparent 70%);
  background-attachment: fixed;
  box-shadow: 0 0 40px rgba(10, 46, 89, 0.08);
}
body.fixed02 {
  overflow: hidden;
}
a {
  color: var(--blue-600);
  text-underline-offset: 3px;
}
a:hover {
  color: var(--navy-900);
}
img {
  max-width: 100%;
  height: auto;
}
.pc {
  display: block;
}
.sp {
  display: none;
}
.dinb {
  display: inline-block;
}
/* 見出し・短い項目は文節の途中で改行しない（対応ブラウザのみ） */
h1,
h2,
.page-head__title,
.prep__title,
.news__item dd,
.overview__dd,
.greeting-top,
.access-info,
.footer-brand {
  word-break: auto-phrase;
}
.nw {
  white-space: nowrap;
}

/* ---------- header ---------- */
.site-header {
  position: relative;
  background: linear-gradient(180deg, #fff 0%, var(--sky-50) 100%);
}
.site-header::after {
  content: '';
  display: block;
  height: 4px;
  background: var(--wave);
}
.site-header .inner {
  padding: 10px 20px;
}
.header-brand {
  gap: 16px;
  min-width: 0;
  color: var(--navy-900);
  text-decoration: none;
}
.header-brand:hover {
  color: var(--navy-900);
}
.header-logo {
  flex: 0 0 auto;
}
.header-logo img {
  display: block;
  width: 58px;
  height: auto;
}
.header-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.header-tagline {
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  margin-bottom: 2px;
  font-family: var(--font-mincho);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  color: var(--blue-600);
}
.header-tagline::before {
  content: '';
  width: 28px;
  height: 1px;
  background: var(--gold);
}
.header-title {
  font-family: var(--font-mincho);
  font-weight: 800;
  font-size: clamp(1.2rem, 2vw, 1.55rem);
  line-height: 1.35;
  letter-spacing: 0.06em;
}
.header-title > span {
  display: inline-block;
}

.header-meta {
  flex: 0 0 auto;
  padding-left: 20px;
  border-left: 1px solid var(--line);
}
.meta-row {
  display: flex;
  align-items: center;
  gap: 10px;
  line-height: 1.6;
}
.meta-row + .meta-row {
  margin-top: 6px;
}
.meta-label {
  flex: 0 0 auto;
  padding: 0 0.6em;
  background: var(--navy-900);
  color: #fff;
  font-size: 0.72rem;
  letter-spacing: 0.3em;
  text-indent: 0.3em;
  line-height: 1.8;
}
.meta-value {
  font-family: var(--font-mincho);
  font-weight: 700;
  color: var(--navy-900);
  font-size: 0.88rem;
  white-space: nowrap;
}
.meta-num {
  font-size: 1.35em;
  padding: 0 0.04em;
}
.meta-value .text-primary {
  color: var(--blue-600) !important;
}

/* ---------- layout ---------- */
#wrapper {
  background: rgba(255, 255, 255, 0.55);
}
#society-aside {
  padding: 20px 0 0 16px;
}
#society-main {
  padding: 20px 16px 0 20px;
  min-height: 60vh;
}

/* ---------- side menu ---------- */
#society-main-menu ul {
  list-style: none;
  margin: 0;
  padding: 0;
  background: #fff;
  border: 1px solid var(--line);
  border-top: 3px solid var(--navy-900);
}
#society-main-menu li + li {
  border-top: 1px solid var(--sky-100);
}
#society-main-menu a {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px 9px 14px;
  font-weight: 500;
  font-size: 0.86rem;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--navy-900);
  text-decoration: none;
  transition: background-color 0.2s, color 0.2s, padding-left 0.2s;
}
#society-main-menu a::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--blue-500);
  transform: scaleY(0);
  transition: transform 0.2s;
}
#society-main-menu a:hover {
  background: var(--sky-50);
  padding-left: 20px;
}
#society-main-menu a:hover::before {
  transform: scaleY(1);
}
#society-main-menu .menu-ico {
  font-size: 0.75rem;
  color: var(--blue-500);
}
#society-main-menu li.society-active > a {
  background: var(--navy-900);
  color: #fff;
  padding-left: 16px;
}
#society-main-menu li.society-active > a::before {
  transform: none;
  background: var(--gold);
}
#society-main-menu li.society-active .menu-ico {
  color: var(--sky-300);
}
#society-main-menu li.preparation > a {
  color: #a3adba;
  pointer-events: none;
  cursor: default;
}
#society-main-menu li.preparation .menu-ico {
  color: #c7cfd9;
}
#society-main-menu li.preparation > a::after {
  content: '準備中';
  margin-left: auto;
  padding: 0 0.5em;
  border: 1px solid #ccd4de;
  font-size: 0.56rem;
  font-weight: 400;
  font-feature-settings: 'palt';
  letter-spacing: 0;
  color: #a3adba;
  white-space: nowrap;
}

/* ---------- poster download ---------- */
.flyer-dl {
  display: flex;
  align-items: stretch;
  margin-top: 20px;
  background: #fff;
  border: 1px solid var(--line);
  color: var(--navy-900);
  text-decoration: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.flyer-dl:hover {
  color: var(--navy-900);
  border-color: var(--sky-300);
  box-shadow: 0 4px 14px rgba(10, 46, 89, 0.1);
}
.flyer-dl__thumb {
  flex: 0 0 44%;
  padding: 12px 0 12px 12px;
}
.flyer-dl__thumb img {
  display: block;
  width: 100%;
  height: auto;
  box-shadow: 0 1px 4px rgba(10, 46, 89, 0.18);
}
.flyer-dl__body {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 10px 8px;
  text-align: center;
}
.flyer-dl__title {
  font-family: var(--font-en);
  font-weight: 700;
  font-size: 1.3rem;
  line-height: 1.15;
  letter-spacing: 0.02em;
  color: var(--navy-900);
  transition: color 0.2s;
}
.flyer-dl:hover .flyer-dl__title {
  color: var(--blue-600);
}
.flyer-dl__icon {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  margin-top: 12px;
  border: 1px solid var(--sky-300);
  border-radius: 50%;
  font-size: 0.95rem;
  color: var(--blue-600);
  transition: background-color 0.2s, border-color 0.2s, color 0.2s;
}
.flyer-dl:hover .flyer-dl__icon {
  background: var(--navy-900);
  border-color: var(--navy-900);
  color: #fff;
}

/* SP メニュー内のポスター */
.menu-content .menu-flyer {
  font-family: var(--font-en);
  font-size: 1.05rem;
  letter-spacing: 0.08em;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 20px;
  padding: 11px;
  border: 1px solid rgba(255, 255, 255, 0.6);
  color: #fff;
  font-weight: 500;
}

/* ---------- side secretariat ---------- */
#society-aside address {
  margin: 24px 0 0;
  font-style: normal;
}
#society-aside .secretariat {
  list-style: none;
  margin: 0;
  padding: 16px;
  background: #fff;
  border: 1px solid var(--line);
  font-size: 0.78rem;
  line-height: 1.75;
}
.secretariat__title {
  display: inline-block;
  margin-bottom: 6px;
  padding: 0 0.8em;
  background: var(--navy-900);
  color: #fff;
  font-size: 0.75rem;
  letter-spacing: 0.15em;
}
.secretariat__name {
  font-weight: 700;
  color: var(--navy-900);
}
#society-aside .secretariat a {
  word-break: break-all;
}

/* ---------- top ---------- */
.topimg {
  box-shadow: 0 10px 30px rgba(10, 46, 89, 0.18);
}
.topimg img {
  display: block;
  width: 100%;
}

.news {
  margin-top: 28px;
}
.news__heading {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mincho);
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--navy-900);
  position: relative;
}
.news__heading::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 120px;
  height: 3px;
  background: var(--wave);
}
.news__en {
  font-family: var(--font-en);
  font-weight: 700;
  font-size: 1.9rem;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--blue-500);
}
.news__list {
  background: #fff;
  border: 1px solid var(--line);
  max-height: 360px;
  overflow-y: auto;
}
.news__item {
  display: flex;
  gap: 24px;
  margin: 0;
  padding: 16px 20px;
}
.news__item + .news__item {
  border-top: 1px dashed var(--line);
}
.news__item dt {
  flex: 0 0 auto;
  font-family: var(--font-num);
  font-weight: 500;
  font-size: 0.95rem;
  font-variant-numeric: tabular-nums;
  color: var(--blue-600);
  letter-spacing: 0.08em;
}
.news__item dd {
  margin: 0;
}

/* ---------- sub page heading ---------- */
.page-head {
  position: relative;
  margin-bottom: 28px;
  padding: 20px 24px 17px;
  overflow: hidden;
  color: #fff;
  background:
    radial-gradient(420px 160px at 92% 0%, rgba(169, 196, 218, 0.45), transparent 70%),
    linear-gradient(115deg, var(--navy-900) 0%, var(--navy-700) 55%, var(--blue-600) 100%);
}
.page-head::before {
  /* 流れのライン */
  content: '';
  position: absolute;
  right: -40px;
  top: -30px;
  width: 340px;
  height: 160px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.18);
  box-shadow:
    0 0 0 12px rgba(255, 255, 255, 0.04),
    0 0 0 26px rgba(255, 255, 255, 0.03);
  transform: rotate(-12deg);
}
.page-head::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--gold) 0 64px, transparent 64px);
}
.page-head__en {
  position: relative;
  margin: 0 0 2px;
  font-family: var(--font-en);
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: 0.14em;
  color: var(--sky-300);
}
.page-head__title {
  position: relative;
  margin: 0;
  font-family: var(--font-mincho);
  font-weight: 800;
  font-size: clamp(1.3rem, 2.4vw, 1.6rem);
  letter-spacing: 0.08em;
  line-height: 1.4;
}

.page-body {
  padding: 28px;
  background: #fff;
  border: 1px solid var(--line);
}

/* ---------- greeting ---------- */
.greeting-top {
  margin-bottom: 28px;
  padding: 20px 24px;
  background: var(--sky-50);
  border-left: 4px solid var(--navy-900);
}
.greeting-top__conf {
  font-size: 0.85rem;
  color: var(--muted);
}
.greeting-top__conf > span {
  display: inline-block;
}
.greeting-top__role {
  margin-top: 4px;
  font-family: var(--font-mincho);
  font-weight: 700;
  color: var(--navy-900);
}
.greeting-top__role > span {
  margin-left: 0.8em;
  font-size: 1.6rem;
  letter-spacing: 0.15em;
}
.greeting-top__org {
  font-size: 0.88rem;
  color: var(--muted);
}
.greeting-body p {
  margin: 0 0 1.2em;
  text-indent: 1em;
  text-align: justify;
}
.greeting-body p:last-child {
  margin-bottom: 0;
}

/* ---------- 公募企画（本文ページ共通パーツ） ---------- */
.lead-text {
  margin: 0 0 32px;
  padding: 18px 22px;
  background: var(--sky-50);
  border-left: 4px solid var(--blue-500);
}
.sec-title {
  position: relative;
  margin: 0 0 24px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mincho);
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: 0.08em;
  color: var(--navy-900);
}
.sec-title::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 96px;
  height: 3px;
  background: var(--wave);
}
.item-block {
  margin-bottom: 32px;
}
.item-block p {
  margin: 0 0 0.6em;
}
.item-title {
  display: flex;
  align-items: baseline;
  gap: 0.4em;
  margin: 0 0 12px;
  padding: 8px 14px;
  background: linear-gradient(90deg, var(--sky-100) 0%, rgba(234, 243, 250, 0) 100%);
  border-left: 3px solid var(--navy-900);
  font-family: var(--font-mincho);
  font-weight: 700;
  font-size: 1.12rem;
  color: var(--navy-900);
  word-break: auto-phrase;
}
.item-title__num {
  font-family: var(--font-num);
  font-weight: 600;
  color: var(--blue-600);
}
.item-tag {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 10px;
}
.item-tag__label {
  flex: 0 0 auto;
  padding: 0 0.7em;
  background: var(--navy-900);
  color: #fff;
  font-size: 0.78rem;
  letter-spacing: 0.15em;
  line-height: 1.9;
}
.item-tag__text {
  font-weight: 700;
  color: var(--navy-900);
}
.note {
  font-size: 0.85rem;
  color: var(--muted);
}
/* 「※」で始まる注記：2行目以降は※の幅だけ字下げ（ぶら下げ） */
.kome {
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 0.25em;
}
.kome__mark {
  line-height: inherit;
}
.schedule {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 12px;
  margin: 4px 0 12px !important;
  padding: 10px 16px;
  background: var(--sky-50);
  border: 1px solid var(--line);
}
.schedule__label {
  flex: 0 0 auto;
  padding: 0 0.7em;
  background: var(--navy-900);
  color: #fff;
  font-size: 0.78rem;
  letter-spacing: 0.15em;
  line-height: 1.9;
}
.schedule__text {
  font-weight: 700;
  color: var(--navy-900);
}
.sub-title {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  margin: 22px 0 8px;
  padding-left: 14px;
  position: relative;
  font-weight: 700;
  font-size: 1rem;
  color: var(--navy-900);
  word-break: auto-phrase;
}
.sub-title::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.45em;
  width: 6px;
  height: 6px;
  background: var(--blue-500);
  transform: rotate(45deg);
}
.item-tag + .sub-title,
.item-title + .sub-title {
  margin-top: 4px;
}
.ext-link {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: baseline;
  column-gap: 0;
  font-weight: 500;
}
.ext-link .bi {
  margin-left: 0.4em;
  font-size: 0.8em;
}
.contact-box {
  margin: 0;
  padding: 14px 18px;
  background: var(--sky-50);
  border: 1px solid var(--line);
  font-style: normal;
  line-height: 1.9;
}
.contact-box__name {
  font-weight: 700;
  color: var(--navy-900);
}
.contact-box__label {
  display: inline-block;
  min-width: 4.2em;
  margin-right: 0.6em;
  font-family: var(--font-num);
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--blue-600);
}
.contact-box > div {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
}
.contact-box__val {
  white-space: nowrap; /* 番号・アドレスは途中で切らない（入らなければ次の行へ） */
}
.deadline {
  display: inline-block;
  margin: 2px 0 10px !important;
  padding: 10px 20px;
  border: 2px solid var(--navy-900);
  background: #fff;
}
.deadline__date {
  font-family: var(--font-mincho);
  font-weight: 800;
  font-size: 1.3rem;
  letter-spacing: 0.06em;
  color: var(--navy-900);
}
.entry-btns {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  margin-top: 8px;
  padding: 28px 16px;
  background: var(--sky-50);
  border: 1px solid var(--line);
}
.entry-btn {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 4px 10px;
  width: 100%;
  max-width: 440px;
  padding: 15px 44px;
  background: var(--navy-900);
  border: 1px solid var(--navy-900);
  color: #fff;
  font-weight: 700;
  line-height: 1.5;
  text-align: center;
  text-decoration: none;
  transition: background-color 0.2s, border-color 0.2s;
  word-break: auto-phrase;
}
#society-main a.entry-btn:hover {
  background: var(--blue-600);
  border-color: var(--blue-600);
  color: #fff;
}
.entry-btn .bi {
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.85em;
  opacity: 0.85;
}
.entry-btn__text {
  min-width: 0;
}
.entry-btn--sub {
  background: #fff;
  color: var(--navy-900);
}
.entry-btn.is-disabled {
  background: #f1f3f6;
  border-color: #d5dbe3;
  color: #9aa4b2;
  pointer-events: none;
  cursor: default;
}
.entry-btn__badge {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  padding: 0 0.5em;
  border: 1px solid #ccd4de;
  font-size: 0.68rem;
  font-weight: 400;
  font-feature-settings: 'palt';
  letter-spacing: 0;
}

/* ---------- outline ---------- */
.overview {
  margin: 0;
  border-top: 1px solid var(--line);
}
.overview__row {
  display: flex;
  border-bottom: 1px solid var(--line);
}
.overview__dt {
  flex: 0 0 9.5em;
  padding: 16px 18px;
  background: var(--sky-50);
  font-weight: 700;
  color: var(--navy-900);
  border-right: 3px solid var(--sky-200);
}
.overview__dd {
  flex: 1 1 auto;
  margin: 0;
  padding: 16px 20px;
  min-width: 0;
}
.overview__aff {
  /* 所属は1行で表示（途中で改行させない） */
  display: inline-block;
  margin-left: 0.3em;
  white-space: nowrap;
  font-size: 0.85em;
  letter-spacing: 0;
  font-feature-settings: 'palt';
  color: var(--muted);
}
.overview__dd address {
  margin: 0;
  font-style: normal;
}

/* ---------- access ---------- */
.access-info address {
  margin: 0;
  font-style: normal;
}
.access-info .fw-bold {
  font-family: var(--font-mincho);
  font-size: 1.25rem;
  color: var(--navy-900);
}
.access-map {
  margin-top: 20px;
  position: relative;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--line);
}
.access-map iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* ---------- links ---------- */
.link-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.link-list li {
  border-bottom: 1px solid var(--line);
}
.link-list a {
  display: block;
  padding: 16px 8px;
  font-weight: 500;
  text-decoration: none;
}
.link-list a:hover {
  background: var(--sky-50);
}

/* ---------- preparation ---------- */
.prep {
  padding: 40px 16px;
  text-align: center;
}
.prep__icon {
  display: inline-grid;
  place-items: center;
  width: 72px;
  height: 72px;
  margin-bottom: 14px;
  border-radius: 50%;
  background: var(--sky-100);
  font-size: 2rem;
  color: var(--blue-600);
}
.prep__title {
  margin: 0 0 8px;
  font-family: var(--font-mincho);
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--navy-900);
  letter-spacing: 0.1em;
}
.prep__text {
  max-width: 34em;
  margin: 0 auto;
  font-size: 0.92rem;
  color: var(--muted);
}

/* ---------- footer ---------- */
#footer-area {
  position: relative;
  margin-top: 20vh; /* 本文とフッターの間（15〜25vh の中間） */
  padding: 36px 24px 28px;
  color: #fff;
  background:
    radial-gradient(600px 200px at 100% 0%, rgba(60, 131, 189, 0.35), transparent 70%),
    linear-gradient(180deg, var(--navy-800) 0%, var(--navy-900) 100%);
}
#footer-area::before {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 4px;
  background: var(--wave);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.footer-brand {
  font-family: var(--font-mincho);
  font-weight: 700;
  line-height: 1.6;
}
.footer-brand__title {
  font-size: 1.15rem;
  letter-spacing: 0.06em;
}
.footer-brand__meta {
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: 0.85rem;
  color: var(--sky-300);
}
#footer-area .secretariat {
  list-style: none;
  margin: 0;
  padding: 0 0 0 24px;
  border-left: 1px solid rgba(255, 255, 255, 0.25);
  font-size: 0.85rem;
  line-height: 1.8;
}
#footer-area .secretariat__title {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.6);
}
#footer-area a {
  color: #fff;
}
footer {
  padding: 12px;
  text-align: center;
  background: #071f3d;
  color: var(--sky-300);
  font-family: var(--font-en);
  letter-spacing: 0.1em;
}

/* ---------- page top ---------- */
#pagetop-scroll {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 50;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--navy-900);
  color: #fff;
  text-align: center;
  line-height: 46px;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(10, 46, 89, 0.3);
}
#pagetop-scroll:hover {
  background: var(--blue-600);
}

/* ---------- hamburger (SP) ---------- */
.hamburger-menu input {
  display: none;
}
.menu-btn {
  position: absolute;
  top: 50%;
  right: 12px;
  z-index: 90;
  width: 48px;
  height: 48px;
  margin-top: -26px;
  background: var(--navy-900);
  cursor: pointer;
}
.menu-btn span,
.menu-btn span::before,
.menu-btn span::after {
  content: '';
  position: absolute;
  left: 50%;
  width: 22px;
  height: 2px;
  margin-left: -11px;
  background: #fff;
  transition: transform 0.25s, background-color 0.25s;
}
.menu-btn span {
  top: 50%;
}
.menu-btn span::before {
  top: -7px;
  margin-left: -11px;
  left: 50%;
}
.menu-btn span::after {
  top: 7px;
  margin-left: -11px;
  left: 50%;
}
#menu-btn-check:checked ~ .menu-btn span {
  background: transparent;
}
#menu-btn-check:checked ~ .menu-btn span::before {
  transform: translateY(7px) rotate(45deg);
}
#menu-btn-check:checked ~ .menu-btn span::after {
  transform: translateY(-7px) rotate(-45deg);
}
.menu-content {
  position: fixed;
  top: 0;
  left: 100%;
  z-index: 80;
  width: 100%;
  height: 100%;
  overflow-y: auto;
  padding: 68px 24px 32px;
  background: linear-gradient(170deg, var(--navy-900) 0%, var(--navy-700) 60%, var(--blue-600) 100%);
  transition: left 0.3s;
}
#menu-btn-check:checked ~ .menu-content {
  left: 0;
}
.menu-content ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.menu-content li {
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}
.menu-content a {
  display: block;
  padding: 11px 6px;
  color: #fff;
  text-decoration: none;
  font-weight: 500;
}
.menu-content li.preparation a {
  color: rgba(255, 255, 255, 0.4);
  pointer-events: none;
}
.menu-content li.preparation a::after {
  content: '準備中';
  margin-left: 0.8em;
  font-size: 0.7rem;
}

/* ---------- responsive ---------- */
@media (max-width: 991.98px) {
  .pc {
    display: none;
  }
  .sp {
    display: block;
  }
  .site-header {
    position: sticky;
    top: 0;
    z-index: 70;
  }
  .site-header .inner {
    padding: 10px 72px 10px 14px;
  }
  .header-logo img {
    width: 52px;
  }
  .header-brand {
    gap: 10px;
  }
  #society-main {
    padding: 20px 14px 0;
  }
  #footer-area {
    margin-top: 15vh;
  }
}
@media (max-width: 767.98px) {
  /* スマホ：ヘッダーは大会名1行だけにして縦幅を詰める */
  .site-header .inner {
    min-height: 52px;
    padding: 8px 60px 8px 14px;
  }
  .header-logo,
  .header-tagline {
    display: none;
  }
  .header-title {
    font-size: clamp(0.85rem, 4.4vw, 1.1rem);
    letter-spacing: 0.02em;
    white-space: nowrap;
  }
  /* ハンバーガーは右上に余白なしでぴったり付ける */
  .menu-btn {
    top: 0;
    right: 0;
    bottom: 4px;
    width: 52px;
    height: auto;
    margin-top: 0;
  }
  /* ページ見出しも薄く */
  .page-head {
    display: flex;
    align-items: baseline;
    flex-direction: row-reverse;
    justify-content: flex-end;
    gap: 10px;
    margin-bottom: 16px;
    padding: 12px 16px 11px;
  }
  .page-head::before {
    display: none;
  }
  .page-head::after {
    height: 2px;
  }
  .page-head__en {
    margin: 0;
    font-size: 0.82rem;
  }
  .page-head__title {
    font-size: 1.2rem;
    letter-spacing: 0.06em;
  }
  #society-main {
    padding-top: 14px;
  }
  /* 住所は〒の後で改行し、2行目から住所 */
  .zip {
    display: block;
  }
  /* 所属は名前の下の行に、画面幅に合わせて縮めて1行で */
  .overview__aff {
    display: block;
    margin-left: 0;
    font-size: min(0.85em, 3.5vw);
  }
  .greeting-top__org {
    white-space: nowrap;
    letter-spacing: 0;
    font-feature-settings: 'palt';
    font-size: min(0.88rem, 3.6vw);
  }
  /* フッターの会期｜会場は2行に分け、区切り線は出さない */
  .footer-sep {
    display: none;
  }
  .footer-brand__meta .dinb {
    display: block;
  }
}
@media (max-width: 576px) {
  body {
    font-size: 15px;
  }
  .page-body {
    padding: 20px 16px;
  }
  .news__item {
    flex-direction: column;
    gap: 2px;
    padding: 14px 16px;
  }
  .overview__row {
    flex-direction: column;
  }
  .overview__dt {
    flex-basis: auto;
    padding: 8px 14px;
    border-right: 0;
  }
  .overview__dd {
    padding: 12px 14px;
  }
  .greeting-top {
    padding: 16px;
  }
  .lead-text {
    padding: 14px 16px;
  }
  .sec-title {
    font-size: 1.2rem;
  }
  .item-title {
    font-size: 1.02rem;
    padding: 7px 10px;
  }
  .deadline {
    padding: 8px 14px;
  }
  .deadline__date {
    font-size: 1.12rem;
  }
  .entry-btns {
    padding: 16px 10px;
  }
  .entry-btn {
    padding: 13px 38px 13px 14px;
    font-size: 0.9rem;
  }
  .entry-btn--sub {
    padding-right: 52px;
  }
  .entry-btn .bi {
    right: 14px;
  }
  .entry-btn__badge {
    right: 8px;
  }
  #footer-area .secretariat {
    padding-left: 0;
    border-left: 0;
  }
}

/* 最大幅（1080px）以上ではメニューを1行に固定。それより狭い時は折り返しを許す */
@media (min-width: 1080px) {
  #society-main-menu a {
    white-space: nowrap;
  }
}