/* ================================
   Variables & Fonts
================================ */
:root {
  --bg: #ffffff;
  --text: #0b0b0f;
  --muted: #6b7280;
  --line: #e5e7eb;
  --brand: #82dee4;
  --brand-ink: #ffffff;
  --brand-gradient: linear-gradient(90deg, #1a2a6c, #4f66ff, #ff5ccd);
  --alt: #f7f7f9;

  --radius: 16px;
  --container: 960px;

  --font-mincho: "Shippori Mincho", "Noto Serif JP", "Hiragino Mincho ProN", serif;
  --font-round: "Zen Maru Gothic", "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic",
    sans-serif;
  --font-body: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  --font-latin: "Poppins", system-ui, sans-serif;

  /* セーフエリア */
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);

  /* stickyヘッダーの実効高さ（端末で微調整OK） */
  --header-h: 72px;
}
@media (min-width: 960px) {
  :root {
    --header-h: 88px;
  }
}

/* ページ内リンクの食い込み防止 */
html {
  scroll-padding-top: calc(var(--header-h) + 8px);
}

/* ================================
   Base / Reset
================================ */
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: var(--font-body);
}

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

/* Utilities */
.font-mincho {
  font-family: var(--font-mincho) !important;
}
.font-round {
  font-family: var(--font-round) !important;
}

/* ================================
   Typography
================================ */
h2 {
  font-family: "Yusei Magic", var(--font-body);
  font-weight: 400;
  font-size: 28px;
  letter-spacing: 0.02em;
  position: relative;
  display: inline-block;
  padding-bottom: 6px;
  text-align: center;
}
h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, #4facfe, #7366ff, #b75cff);
  border-radius: 2px;
}

/* 見出し系の丸ゴ適用対象 */
.event-date,
.card-title,
.btn,
nav a,
.chip {
  font-family: var(--font-round);
  font-weight: 700;
  letter-spacing: 0.02em;
}

/* 英字優先 */
.brand,
.btn {
  font-family: var(--font-latin), var(--font-round);
}

/* ================================
   Layout
================================ */
.container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 10px;
}
.section {
  padding: 72px 0;
}
.section-alt {
  padding: 72px 0;
  background: var(--alt);
}
.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 16px;
  margin-bottom: 24px;
}
.section-head.center {
  justify-content: center;
}

/* ================================
   Header
================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(180%) blur(8px);
  background: rgba(255, 255, 255, 0.85);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: auto;
  min-height: 64px;
  padding-block: 14px;
  gap: 16px;
}
.site-header .container {
  padding-inline: 16px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  text-decoration: none;
  color: inherit;
}
.brand-text {
  letter-spacing: 0.02em;
}
.nav {
  display: flex;
  align-items: center;
  gap: 16px;
  flex: 1 1 auto;
  min-width: 0;
}
.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: #fff;
  padding: 6px 10px;
  border-radius: 10px;
  font-size: 18px;
  cursor: pointer;
}
.nav-list {
  display: flex;
  gap: 20px;
  list-style: none;
  padding: 0;
  margin: 0;
}
.nav-list a {
  color: inherit;
  text-decoration: none;
  padding-block: 8px;
  white-space: nowrap;
}
.nav-list a:hover {
  text-decoration: underline;
}
.header-cta {
  margin-left: 12px;
  white-space: nowrap;
  flex: 0 0 auto;
  display: inline-flex;
}

/* ナビ全体：縦方向を中央に揃える */
.nav-list {
  align-items: center;
}

/* li自体も中央揃え */
.nav-list > li {
  display: flex;
  align-items: center;
}

/* 通常リンク中央揃え */
.nav-list a {
  display: inline-flex;
  align-items: center;
  line-height: 1;
  padding-block: 8px;
}

/* ドロップダウンのボタン */
.nav-dropbtn {
  display: inline-flex;
  align-items: center;
  line-height: 1;
  padding-block: 8px;
}

/* ヘッダー余白・ナビゲーションの拡張（デスクトップ） */
@media (min-width: 960px) {
  .site-header {
    --container: 1200px;
  }
  .header-inner {
    padding-block: 18px;
  }
  .site-header .container {
    padding-inline: 24px;
  }
  .nav {
    gap: clamp(12px, 1.5vw, 20px);
  }
  .nav-list {
    gap: clamp(14px, 2vw, 24px);
  }
  .header-cta {
    margin-left: clamp(12px, 1.6vw, 20px);
  }
}

/* ===== Header layout: 3-column grid ===== */
@media (min-width: 1025px) {
  .header-inner{
    display: grid;
    grid-template-columns: auto 1fr auto; /* 左（ロゴ+来場者）/ 中央メニュー / 右（発表者） */
    align-items: center;
    column-gap: 16px;
  }

  .header-left{
    display: flex;
    align-items: center;
    gap: 16px;
    justify-self: start;
    min-width: 0;
  }

  .nav{
    justify-self: center;
    width: max-content;
    flex: initial; /* flex:1 を無効化 */
  }

  .header-cta-right{
    justify-self: end;
  }

  /* Grid時は余計な左マージンを消す（ズレ防止） */
  .header-cta{
    margin-left: 0;
  }
	
  .header-left .header-cta { margin-left: 20px; } /* 来場者だけ少し右 */
  .header-cta-right { margin-right: 20px; }       /* 発表者だけ少し左（右端から離す）*/
}

@media (max-width: 960px) {
  .nav-toggle { z-index: 100; }
}

/* Xリンク */
.site-header a.hide-x-on-mobile {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px;
  min-width: 40px;
  min-height: 40px;
  border-radius: 8px;
  transition: opacity 0.15s ease, transform 0.12s ease, background-color 0.2s ease,
    box-shadow 0.2s ease, filter 0.2s ease;
}
.site-header a.hide-x-on-mobile:hover {
  opacity: 0.65;
}
.site-header .hide-x-on-mobile img {
  display: block;
  line-height: 0;
}

/* モバイル：ハンバーガー右端＆右寄せドロップ */
@media (max-width: 960px) {
  .site-header .header-inner {
    position: relative;
  }
  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
  }
  .nav-list {
    position: absolute;
    right: 10px;
    left: auto;
    top: calc(100% + 8px);
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 10px;
    display: none;
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    min-width: 180px;
    z-index: 60;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
  }
  .nav-list.show {
    display: flex;
  }
}

/* ===== Nav dropdown ===== */
.nav-dropdown {
  position: relative;
}

.nav-dropbtn {
  appearance: none;
  border: 0;
  background: transparent;
  color: inherit;
  cursor: pointer;
  padding-block: 8px;
  font: inherit;
  font-family: var(--font-round);
  font-weight: 700;
  letter-spacing: 0.02em;
  border-radius: 10px;
}

@media (max-width: 960px) {
  .nav-dropbtn {
    display: inline-flex;
    align-items: center;
    line-height: 1;
    padding: 8px 0;
    margin: 0;
  }
}

/* スマホ：ドロップダウン内を縦並びにして右ズレ防止 */
@media (max-width: 960px) {
  .nav-list > li {
    display: block;
  }

  /* ドロップダウンだけ縦に積む */
  .nav-dropdown {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
  }

  /* ボタンとサブメニューを全幅に */
  .nav-dropbtn,
  .nav-sublist {
    width: 100%;
  }

  /* インデント */
  .nav-sublist {
    padding-left: 12px;
  }
}

.nav-dropbtn:hover {
  text-decoration: underline;
}

.nav-sublist {
  list-style: none;
  margin: 0;
  padding: 10px;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 12px;
  display: none;
  flex-direction: column;
  gap: 10px;
  min-width: 180px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.06);
  z-index: 70;
}

/* PC: 位置はドロップダウン */
@media (min-width: 961px) {
  .nav-sublist {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
  }

  /* ホバー/フォーカスでも開く */
  .nav-dropdown:hover .nav-sublist,
  .nav-dropdown:focus-within .nav-sublist {
    display: flex;
  }
}

/* JSで開閉するクラス */
.nav-dropdown.open .nav-sublist {
  display: flex;
}

/* モバイル: ナビのドロップ内で展開（position: static） */
@media (max-width: 960px) {
  .nav-sublist {
    position: static;
    box-shadow: none;
    border-radius: 10px;
  }
}

/* PC以外は非表示、PCのみ表示 */
.header-cta {
  display: none !important;
}
@media (min-width: 1025px) {
  .header-cta {
    display: inline-flex !important;
  }
}

/* Xアイコンを狭幅で隠す（任意） */
@media (max-width: 1100px) {
  .hide-x-on-mobile {
    display: none !important;
  }
}

/* Contact内のXロゴ：ホバーで薄く */
#contact a[href*="x.com"] img {
  transition: opacity 0.15s ease;
}
#contact a[href*="x.com"]:hover img {
  opacity: 0.65;
}

/* ================================
   Hero
================================ */
.hero {
  display: flex;
  align-items: center;
  justify-content: center;

  /* 背景 */
  background-position: center;
  background-repeat: no-repeat;
  background-size: contain; /* ← cover → contain に変更 */
  background-color: #cedde8;	
	
  /* 高さは画面全体からヘッダー分を引く */
  min-height: calc(100dvh - var(--header-h));
}

.hero{
  position: relative;
}

@supports not (height: 100dvh) {
  .hero {
    min-height: calc(100svh - var(--header-h));
  }
}

/* 背景画像の切替（必要に応じてパスは調整） */
@media (min-width: 641px) {
  .hero {
    background-image: url("images/main_800x600.png");
  }
}
@media (max-width: 640px) {
  .hero {
    background-image: url("images/main_390x500.png");
    min-height: 500px; /* ← 画像の高さに固定 */
    background-size: contain; /* 欠けないように表示 */
    background-position: top center;
    background-repeat: no-repeat;
  }
}

/* 内側 */
.hero-inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding-top: max(16px, var(--safe-top));
  padding-bottom: max(20px, var(--safe-bottom));
  padding-left: 16px;
  padding-right: 16px;
  text-align: center;
}

.hero { position: relative; }

/* Hero左上：来場者募集のお知らせバッジ（これだけ残す） */
.hero-float-badge{
  position: absolute;
  top: calc(var(--safe-top) + 16px);
  left: 16px;
  max-width: calc(100% - 32px);

  display: inline-flex;
  align-items: center;
  gap: 8px;

  padding: 10px 14px;
  border-radius: 999px;

  background: rgba(255,255,255,0.92);
  border: 1px solid rgba(220, 38, 38, 0.35);
  color: #dc2626;
  text-decoration: none;

  font-family: var(--font-round);
  font-weight: 700;
  letter-spacing: 0.02em;

  box-shadow: 0 10px 24px rgba(0,0,0,0.10);
  backdrop-filter: blur(6px);
  z-index: 2;
}

@media (min-width: 641px){
  .hero-float-badge{
    left: calc((100vw - var(--container)) / 2 + 32px);
    top: calc(var(--safe-top) + 100px);

    font-size: 18px;        /* ← 文字を大きく */
    padding: 12px 18px;     /* ← バッジ自体を大きく */
    gap: 10px;              /* ← 中の間隔も少し広げる */
  }
}

@media (max-width: 640px){
  .hero-float-badge{
    top: 72px;
    padding: 8px 12px;
    font-size: 12px;
    gap: 6px;
    max-width: calc(100% - 24px);
  }
}

@media (max-width: 390px){
  .hero-float-badge{
	top: 72px;
	  
    font-size: 12px;
    padding: 7px 10px;
  }
}

/* 見出し */
.hero h1 {
  font-size: clamp(28px, 7vw, 64px);
  line-height: 1.2;
  margin: 0 0 1rem;
  color: #fff;
  text-shadow: none;
}

.hero h1 img {
  width: 100%;
  max-width: 800px;
  height: auto;
  margin-bottom: 0.5rem;
}

/* 日付プレート */
.hero h1.event-date {
  display: inline-block;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: #fff;
  background: rgba(0, 0, 0, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: 16px;
  margin-top: 35px;
  padding: 0.3em 1rem;

  /* 横あふれ防止 */
  max-inline-size: min(92%, 28ch);
  text-wrap: balance;
  white-space: normal;
  word-break: keep-all;
  overflow-wrap: anywhere;

  font-size: clamp(22px, 5vw, 40px);
  line-height: 1.15;
}
@media (max-width: 640px) {
  .hero h1.event-date {
    font-size: clamp(18px, 5.2vw, 28px);
    padding: 0.25em 0.8rem;
	margin-top: -15px;
  }
}

/* Heroの開催日時：3行にする */
.hero h1.event-date .event-label,
.hero h1.event-date .event-time{
  display: block;     /* ← これが決定打 */
}

.hero h1.event-date .event-label{
  font-size: 0.55em;
  font-weight: 500;
  opacity: 0.9;
  letter-spacing: 0.04em;
}

.hero h1.event-date .event-time{
  margin-top: 8px;
  font-size: 0.7em;
  font-weight: 600;
  opacity: 0.9;
}

/* hero-2024 */
.hero-2024 {
  background-image: url("images/2024/2024_hero.png"); /* ←差し替え */
  background-size: cover;
  background-position: center;
}

.hero-2024 { position: relative; }

.hero-2024::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.45); /* 暗さ：0.35〜0.55で調整 */
  z-index: 0;
}

.hero-2024-inner {
  position: relative;
  z-index: 1;

  min-height: calc(55vh - var(--header-h)); /* ← 半分ちょい */
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.hero.hero-2024 h1.hero-2024-title {
  font-family: var(--font-round);
  font-size: clamp(22px, 4vw, 40px);
  font-weight: 600;
  letter-spacing: 0.03em;
  line-height: 1.35;
  text-wrap: balance;

  color: #fff;
  padding: 0.6em 1.2em;
  border-radius: 18px;

  background: rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(4px);
}

@media (max-width: 640px){
  .hero.hero-2024 h1.hero-2024-title{
    font-size: 18px;
    padding: 0.3em 0.6em;
    background: rgba(0,0,0,0.25);
  }
}

/* PC */
@media (min-width: 641px) {
  .hero-2024-inner {
    min-height: calc(55vh - var(--header-h));
  }
}

/* スマホ */
@media (max-width: 640px) {
  .hero-2024-inner {
    min-height: 38vh;   /* スマホはさらにコンパクトでOK */
    padding-top: 24px;
    padding-bottom: 24px;
  }
}

.hero-2024::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 40px;
  background: linear-gradient(to bottom, rgba(0,0,0,0), #fff);
}

.hero.hero-2024 {
  min-height: calc(55vh - var(--header-h));
}
@media (max-width: 640px){
  .hero.hero-2024 {
    min-height: 38vh;
  }
}

/* ================================
   Buttons & Links
================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  border-radius: 12px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  font-weight: 600;
}
.btn-lg {
  padding: 14px 18px;
  font-size: 16px;
  border-radius: 14px;
}
.btn-primary {
  background: var(--brand-gradient);
  color: #fff;
  border: none;
  transition: filter 0.2s ease;
}

/* 小さいほう */
.btn-primary-big{
  padding: 0.8rem 1.1rem;   /* お好みで微調整 */
}

/* 大きいほう*/
.btn-primary-big2{
  padding: 1.08rem 1.5rem;
}

.btn-primary:hover {
  filter: brightness(1.1);
}
.btn-outline {
  background: #fff;
}
.link-inline {
  position: relative;
  color: #111;
  text-decoration: none;
  padding-bottom: 2px;
}
.link-inline::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--brand-gradient);
}
.btn-center {
  display: block;
  width: fit-content;
  margin: 16px auto 0;
}

/* 白抜き＋グラデ枠 */
.btn-gradient-outline {
  border: 2px solid transparent;
  background:
    linear-gradient(#fff, #fff) padding-box,
    var(--brand-gradient) border-box;
}

/* 文字をグラデに */
.btn-text-gradient {
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent; /* Safari対策 */
}

a.btn.btn-gradient-outline{
  transition: opacity .12s ease;
}

a.btn.btn-gradient-outline:hover,
a.btn.btn-gradient-outline:focus-visible{
  opacity: .75;
}

/* hover（ほんのり反応） */
.btn-gradient-outline:hover {
  filter: brightness(1.02);
}

/* キーボード操作のフォーカス見やすく */
.btn-gradient-outline:focus-visible {
  outline: 3px solid rgba(79, 172, 254, 0.35);
  outline-offset: 2px;
}

/* ================================
   Grids & Cards
================================ */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
@media (min-width: 768px) {
  .grid-2 {
    grid-template-columns: 1fr 1fr;
  }
}
@media (min-width: 640px) {
  .grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (min-width: 960px) {
  .grid-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.cards {
  gap: 16px;
}
.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.02);
}
.card-title {
  margin: 6px 0;
  font-size: 20px;
}
.card-meta {
  font-size: 16px;
  color: var(--muted);
}
.card-text {
  color: #374151;
  line-height: 1.7;
}

/* ================================
   About（左 縦書き × 右 本文）
================================ */
#about {
  background: #fff !important;
}
#about .about-main {
  background: transparent;
  border: 0;
  text-align: left !important;
}

.about-grid {
  display: grid;
  grid-template-columns: clamp(72px, 9vw, 140px) 1fr;
  gap: 20px;
  align-items: stretch;
}
.about-catch {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #fff;
  overflow: hidden;
}
.catch-vert {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-round);
  font-weight: 400;
  font-size: clamp(22px, 3.6vw, 34px);
  letter-spacing: 0.12em;
  line-height: 2;
  color: #0a1f44;
  padding: 12px 6px;
}
.about-main .about-text {
  font-size: 18px;
  line-height: 1.9;
  color: #444;
}

/* 見出しだけ中央、本文は左寄せ */
#about .about-main h2 {
  display: table;
  margin: 0 auto 12px;
  text-align: center;
}
#about .about-main .about-text,
#about .about-main p,
#about .about-main ul,
#about .about-main ol {
  text-align: left !important;
  margin-inline: 0 !important;
}

@media (max-width: 640px){
  #about .about-main .about-text{
    font-size: 15px;
    line-height: 1.85;
  }
}

/* スマホ：横書き＆中央に切替 */
@media (max-width: 768px) {
  .about-grid {
    grid-template-columns: 1fr;
  }
  .about-catch {
    padding: 8px 0;
    justify-content: center;
    align-items: center;
    background: transparent;
  }
  .catch-vert {
    writing-mode: horizontal-tb !important;
    text-orientation: initial !important;
    text-align: center;
    margin-left: 0 !important;
    transform: none !important;
    font-size: 20px;
    line-height: 1.6;
    letter-spacing: 0.02em;
    display: inline-block;
  }
}

/* ================================
   Section subtitle / CTA
================================ */
.section-subtitle {
  display: block;
  text-align: center;
  margin: 6px 0 22px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: #0a1f44;
  font-size: 1.1rem;
}
.section-subtitle time {
  font-variant-numeric: tabular-nums;
}

.program-cta {
  text-align: center;
  margin: 28px auto 0;
  padding: 18px 20px;
  max-width: 880px;
  font-family: var(--font-body);
  font-size: clamp(18px, 2.2vw, 20px);
  letter-spacing: 0.02em;
  line-height: 1.9;
  color: #0a1f44;
  border: 2px solid transparent;
  border-radius: 16px;
  background: linear-gradient(#fff, #fff) padding-box, var(--brand-gradient) border-box;
  box-shadow: 0 8px 24px rgba(17, 24, 39, 0.06);
}
@media (max-width: 640px) {
  .program-cta {
    padding: 14px 16px;
    font-size: 18px;
  }
}

.notice{
  max-width: 900px;
  margin: 10px auto 18px;
  padding: 12px 14px;
  border-radius: 12px;
  line-height: 1.7;
  font-weight: 700;
}

.notice-danger{
  color: #b91c1c;
  background: rgba(185, 28, 28, 0.08);
  border: 1px solid rgba(185, 28, 28, 0.35);
}

/* Proposal セクションの背景と余白 */
#proposal {
  background: var(--alt) !important;
  padding-top: 1px;
}
@media (max-width: 640px) {
  #proposal {
    padding-top: 1px;
  }
}

/* Proposal 左カラムの背景を薄灰に */
#proposal .about-catch {
  background: var(--alt) !important;
}
@media (max-width: 768px) {
  #proposal .about-catch {
    background: var(--alt) !important;
  }
}

/* 提案リスト直下の注意文を整える */
#proposal .proposal-list + .section-note {
  max-width: 600px;
  margin: 8px auto 0;
  text-align: center;
  font-size: 0.95rem;
  color: #6b7280;
}

/* ================================
   Proposal list
================================ */
.proposal-list {
  max-width: 600px;
  margin: 1rem auto;
  padding: 0;
  list-style: none;
  text-align: left;
}
.proposal-list li {
  margin: 8px 0;
  position: relative;
  line-height: 1.8;
  border: 1px solid #a5bcc2;
  border-radius: 6px;
  padding: 10px 15px 10px 50px;
  background: #f2f6f7;
  color: #333;
  font-size: 1rem;
  transition: background-color 0.3s ease;
}
.proposal-list li:hover {
  background: #e1eaec;
}
.proposal-list li::before {
  content: "✓";
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  line-height: 28px;
  background: #a5bcc2;
  color: #fff;
  font-size: 1rem;
  font-weight: bold;
  border-radius: 50%;
  text-align: center;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

/* ================================
   Speakers: Auto scroll gallery
================================ */
#speakers .auto-scroll-gallery {
  margin-top: 30px;
}
@media (max-width: 640px) {
  #speakers .auto-scroll-gallery {
    margin-top: 16px;
  }
}

.auto-scroll-gallery {
  overflow: hidden;
  position: relative;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
}
.auto-scroll-gallery .track {
  display: flex;
  align-items: center;
  gap: 16px;
  will-change: transform;
}
.auto-scroll-gallery img {
  width: clamp(160px, 28vw, 320px);
  aspect-ratio: 4/3;
  object-fit: cover;
  border-radius: 14px;
  border: 1px solid var(--line);
  display: block;
  transition: transform 0.25s ease;
}
.auto-scroll-gallery img:hover {
  transform: scale(1.03);
}
@media (max-width: 640px) {
  .auto-scroll-gallery .track {
    gap: 12px;
  }
  .auto-scroll-gallery img {
    border-radius: 12px;
  }
}

/* ================================
   Access / Map
================================ */
#access {
  background: #eaf6ff !important;
}
@media (min-width: 768px) {
  #access .grid-2 {
    align-items: stretch;
  }
  #access .card,
  #access .map-placeholder {
    height: 100%;
  }
  #access .map-placeholder {
    aspect-ratio: auto;
  }
  #access .map-placeholder iframe {
    width: 100%;
    height: 100%;
  }
}

/* 角丸とクリッピング */
#access .card,
#access .map-placeholder {
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid var(--line);
}
/* 念のためiframeも継承 */
#access .map-placeholder iframe {
  border-radius: inherit;
}
/* スマホは16:9 */
@media (max-width: 767px) {
  #access .map-placeholder {
    aspect-ratio: 16/9;
  }
}

/* ================================
   Contact
================================ */
.actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* actions が連続したときだけ間をあける */
.actions + .actions {
  margin-top: 20px;
}

.faq {
  list-style: none;
  padding: 0;
  margin: 12px 0 0;
}
.faq li {
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}
.faq strong {
  margin-right: 4px;
}

/* Contact：スマホは中央寄せ */
@media (max-width: 640px) {
  #contact .grid-2 > div:first-child {
    text-align: center;
  }
  #contact .grid-2 > div:first-child .actions {
    justify-content: center;
  }
  #contact .grid-2 > div:first-child a img {
    display: block;
    margin-inline: auto;
  }
}

/* ================================
   Footer
================================ */
.site-footer {
  text-align: center;
}
.site-footer .footer-inner {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  gap: 5px;
  padding-block: 1px;
}
@media (min-width: 768px) {
  .site-footer .footer-inner {
    flex-direction: row;
    align-items: center;
  }
}
.site-footer .copyright {
  display: block;
  text-align: center;
  margin-block: 16px 24px;
  padding-block: 6px;
}