@charset "UTF-8";

/* ==========================================================================
   慶應義塾大学医学部 百寿総合研究センター — トップページ デザインカンプ
   メイン：#C85A3E（テラコッタ） / 背景：#FBF7F2 / 文字：#2A2520
   見出し：Noto Serif JP / 本文：Noto Sans JP 17px / line-height 1.9
   ========================================================================== */

/* -----  カラー変数  ----- */
:root {
  --color-main: #C85A3E;          /* メイン：テラコッタ */
  --color-main-dark: #A6452C;     /* ホバー用ダーク */
  --color-main-light: #F4E4DC;    /* メイン薄色 */
  --color-bg: #FBF7F2;            /* オフホワイト背景 */
  --color-bg-alt: #F5EDE3;        /* 一段濃いめ背景 */
  --color-text: #2A2520;          /* 濃茶 */
  --color-text-soft: #4A3F35;     /* 補助文字（濃いめに） */
  --color-border: #E5DDD3;        /* 罫線 */
  --color-white: #FFFFFF;

  --ff-serif: "Noto Serif JP", "游明朝", "Yu Mincho", serif;
  --ff-sans:  "Noto Sans JP", "ヒラギノ角ゴ ProN", "Hiragino Kaku Gothic ProN", sans-serif;

  --container: 1200px;
  --radius: 8px;
  --radius-lg: 14px;
  --shadow: 0 6px 24px rgba(42, 37, 32, 0.08);
}

/* -----  リセット  ----- */
*, *::before, *::after { box-sizing: border-box; }
html { font-size: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--ff-sans);
  font-size: 17px;
  line-height: 1.9;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; transition: opacity .2s, color .2s; }
a:hover { opacity: 0.75; }
ul { list-style: none; padding: 0; margin: 0; }
button { font-family: inherit; cursor: pointer; }

.inner {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   トップバー（言語切替）
   ========================================================================== */
.top-bar {
  background: var(--color-text);
  color: #F5EDE3;
  font-size: 13px;
  padding: 6px 0;
}
.top-bar .inner {
  display: flex;
  justify-content: flex-end;
}
.lang-switch {
  display: flex;
  align-items: center;
  gap: 4px;
  font-family: var(--ff-serif);
  letter-spacing: 0.1em;
}
.lang-switch li {
  display: flex;
  align-items: center;
}
.lang-switch li + li::before {
  content: "/";
  color: rgba(255,255,255,0.35);
  margin: 0 8px;
  font-weight: 300;
}
.lang-switch a,
.lang-switch span {
  display: inline-block;
  padding: 2px 4px;
  color: rgba(255,255,255,0.75);
  font-size: 13px;
  font-weight: 500;
  transition: color .2s;
}
.lang-switch a:hover {
  color: #fff;
  opacity: 1;
}
.lang-switch .is-active span {
  color: #fff;
}

/* ==========================================================================
   ヘッダー
   ========================================================================== */
.site-header {
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.site-header .inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 90px;
  max-width: 1480px;
  padding: 0 40px;
  gap: 40px;
}

.logo {
  display: inline-flex;
  align-items: center;
}
.logo img {
  width: auto;
  height: 38px;
  display: block;
}
@media (max-width: 1200px) {
  .logo img { height: 32px; }
}
@media (max-width: 1024px) {
  .logo img { height: 30px; }
}
@media (max-width: 768px) {
  .logo img { height: 28px; }
}

.gnav ul {
  display: flex;
  align-items: center;
  gap: 38px;
  white-space: nowrap;
}
.gnav a {
  font-size: 16px;
  font-weight: 500;
  position: relative;
  padding: 8px 0;
  white-space: nowrap;
}
.gnav a:not(.btn-nav)::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 0;
  height: 2px;
  background: var(--color-main);
  transition: width .25s;
}
.gnav a:not(.btn-nav):hover {
  opacity: 1;
  color: var(--color-main);
}
.gnav a:not(.btn-nav):hover::after { width: 100%; }

.btn-nav {
  background: var(--color-main);
  color: #fff !important;
  padding: 12px 24px !important;
  border-radius: var(--radius);
  font-weight: 700;
  font-size: 15px;
}
.btn-nav:hover {
  background: var(--color-main-dark);
  opacity: 1;
}


.hamburger { display: none; }

/* ==========================================================================
   ヒーロー（上：キャッチ／下：フルワイド写真スライドショー）
   ========================================================================== */
.hero {
  position: relative;
  background: var(--color-bg);
  overflow: hidden;
}

/* 上段：キャッチコピー（コンパクト） */
.hero-headline {
  position: relative;
  padding: 50px 0 40px;
  overflow: hidden;
}
.hero-headline .inner {
  position: relative;
  z-index: 1;
  max-width: 1320px;
}

.hero-headline-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 32px;
  align-items: end;
}

.hero-sub {
  font-family: var(--ff-serif);
  color: var(--color-main);
  letter-spacing: 0.18em;
  font-size: 13px;
  margin: 0 0 14px;
}
.hero-title {
  font-family: var(--ff-serif);
  /* コンパクト版：抑えめサイズ */
  font-size: clamp(28px, 3.6vw, 52px);
  font-weight: 700;
  line-height: 1.4;
  margin: 0;
  color: var(--color-text);
  letter-spacing: 0.02em;
}
.hero-title em {
  color: var(--color-main);
  font-style: normal;
  font-size: 1.1em;
}

/* 右側の小さな英文タグライン */
.hero-tagline {
  font-family: var(--ff-serif);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--color-main);
  text-align: right;
  line-height: 1.6;
  margin: 0 0 8px;
  font-weight: 500;
}
.hero-tagline small {
  display: block;
  font-size: 10px;
  font-weight: 400;
  font-style: italic;
  color: var(--color-text-soft);
  letter-spacing: 0.06em;
  margin-top: 4px;
}

/* 下段：写真スライドショー（左右余白あり・写真は見切れない） */
.hero-visual {
  position: relative;
  width: 100%;
  max-width: 1480px;
  margin: 0 auto;
  padding: 0 40px 60px;
}
.hero-slides {
  position: relative;
  width: 100%;
  /* 写真の元サイズ 2220x1088 ≒ 2:1 に合わせる */
  aspect-ratio: 2 / 1;
  overflow: hidden;
  background: var(--color-bg-alt);
  border-radius: 4px;
}
.hero-slide {
  position: absolute;
  inset: 0;
  margin: 0;
  opacity: 0;
  transition: opacity 1.2s ease;
}
.hero-slide.is-active { opacity: 1; }
.hero-slide img {
  width: 100%;
  height: 100%;
  /* 上下を見切らないため contain ではなく cover だが、画像のアスペクトと一致するので実質ぴったり */
  object-fit: cover;
  object-position: center center;
  filter: brightness(1.02) saturate(1.02);
}
.hero-slide figcaption {
  position: absolute;
  left: 20px;
  bottom: 20px;
  margin: 0;
  padding: 8px 16px;
  background: rgba(255, 255, 255, 0.92);
  color: var(--color-text);
  font-family: var(--ff-serif);
  font-size: 12px;
  letter-spacing: 0.05em;
  border-left: 3px solid var(--color-main);
  opacity: 0;
  transition: opacity .8s ease .3s;
}
.hero-slide.is-active figcaption { opacity: 1; }

/* スライドナビ：写真右下に重ねる */
.hero-nav {
  position: absolute;
  z-index: 3;
  right: 20px;
  bottom: 20px;
  display: flex;
  gap: 18px;
}
.hero-dot {
  background: transparent;
  border: none;
  padding: 8px 0;
  color: rgba(255,255,255,0.65);
  font-family: var(--ff-serif);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  width: 130px;
  transition: color .3s;
}
.hero-dot:hover { color: #fff; }
.hero-dot.is-active { color: #fff; }

.hero-dot-num {
  font-size: 12px;
  letter-spacing: 0.1em;
}
.hero-dot-bar {
  flex: 1;
  height: 2px;
  background: rgba(255,255,255,0.3);
  position: relative;
  overflow: hidden;
}
.hero-dot-bar span {
  position: absolute;
  inset: 0;
  background: var(--color-main);
  transform: scaleX(0);
  transform-origin: left;
}
.hero-dot.is-active .hero-dot-bar span {
  animation: hero-progress 6s linear forwards;
}
@keyframes hero-progress {
  from { transform: scaleX(0); }
  to   { transform: scaleX(1); }
}

/* ==========================================================================
   共通ボタン
   ========================================================================== */
.btn-primary,
.btn-secondary,
.btn-outline {
  display: inline-block;
  font-weight: 700;
  padding: 18px 36px;
  border-radius: var(--radius);
  font-size: 16px;
  letter-spacing: 0.05em;
  transition: all .25s;
  min-width: 220px;
  text-align: center;
}
.btn-primary {
  background: var(--color-main);
  color: #fff;
  box-shadow: 0 4px 12px rgba(200, 90, 62, 0.25);
}
.btn-primary:hover {
  background: var(--color-main-dark);
  transform: translateY(-2px);
  opacity: 1;
  box-shadow: 0 8px 18px rgba(200, 90, 62, 0.35);
}
.btn-secondary {
  background: #fff;
  color: var(--color-text);
  border: 2px solid var(--color-text);
}
.btn-secondary:hover {
  background: var(--color-text);
  color: #fff;
  opacity: 1;
  transform: translateY(-2px);
}
.btn-outline {
  background: transparent;
  color: var(--color-main);
  border: 2px solid var(--color-main);
}
.btn-outline:hover {
  background: var(--color-main);
  color: #fff;
  opacity: 1;
}

/* ==========================================================================
   背景グロー（ホワンとした光彩で温かみを演出）
   ========================================================================== */
.glow {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
  filter: blur(80px);
  opacity: 0.55;
}
.glow--peach   { background: radial-gradient(circle, #F4B89C 0%, rgba(244,184,156,0) 70%); }
.glow--apricot { background: radial-gradient(circle, #F2C29A 0%, rgba(242,194,154,0) 70%); }
.glow--cream   { background: radial-gradient(circle, #F5D7B8 0%, rgba(245,215,184,0) 70%); }
.glow--terra   { background: radial-gradient(circle, #E8A48C 0%, rgba(232,164,140,0) 70%); }

/* ==========================================================================
   セクション共通
   ========================================================================== */
.section {
  padding: 110px 0;
  position: relative;
  overflow: hidden;
}
.section .inner { position: relative; z-index: 1; }

.section-head {
  text-align: center;
  margin-bottom: 64px;
}
.kicker {
  font-family: var(--ff-serif);
  color: var(--color-main);
  letter-spacing: 0.18em;
  font-size: 14px;
  font-weight: 500;
  margin: 0 0 18px;
  text-transform: uppercase;
}
.section-title {
  font-family: var(--ff-serif);
  font-size: clamp(28px, 3.4vw, 40px);
  font-weight: 700;
  line-height: 1.5;
  margin: 0;
  color: var(--color-text);
  letter-spacing: 0.03em;
}
.section-desc {
  margin: 24px auto 0;
  max-width: 680px;
  font-size: 17px;
  color: var(--color-text-soft);
}
.section-foot {
  text-align: center;
  margin-top: 56px;
}

/* ==========================================================================
   長寿の科学
   ========================================================================== */
.about {
  background: var(--color-bg);
  /* 下の柱カードが小さくなったぶん、下余白を詰める */
  padding-bottom: 80px;
}

.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 64px;
  align-items: center;
  margin-bottom: 64px;
}
.about-text p {
  margin: 0 0 24px;
  font-size: 18px;
  line-height: 2.0;
}
.about-text p:last-child { margin-bottom: 0; }
.about-text strong {
  color: var(--color-main);
  background: linear-gradient(transparent 65%, rgba(200,90,62,0.18) 65%);
  padding: 0 2px;
}
.about-image img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  /* 暗めの写真を明るく＋彩度アップ */
  filter: brightness(1.18) contrast(1.04) saturate(1.08);
}

.pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.pillar {
  position: relative;
  background: #fff;
  padding: 28px 28px 26px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  z-index: 1;
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 18px;
  align-items: start;
}
.pillar-icon {
  width: 44px;
  height: 44px;
  margin: 4px 0 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-main-light);
  color: var(--color-main);
  border-radius: 50%;
  grid-row: span 2;
}
.pillar-icon svg {
  width: 22px;
  height: 22px;
}
.pillar h3 {
  font-family: var(--ff-serif);
  font-size: 19px;
  margin: 0 0 6px;
  color: var(--color-text);
  font-weight: 700;
  line-height: 1.4;
}
.pillar p {
  margin: 0;
  color: var(--color-text-soft);
  font-size: 16px;
  line-height: 1.85;
}

/* ==========================================================================
   研究プロジェクト
   ========================================================================== */
.research { background: var(--color-bg-alt); }

.research-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}
.research-card {
  display: block;
  background: #fff;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(42,37,32,.05);
  border: 1px solid var(--color-border);
  border-top: 4px solid var(--color-main);
  transition: transform .3s, box-shadow .3s;
}
.research-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 32px rgba(42,37,32,.12);
  opacity: 1;
}

.research-body {
  padding: 40px 40px 36px;
  position: relative;
}
.research-num {
  font-family: var(--ff-serif);
  font-size: 64px;
  font-weight: 500;
  color: var(--color-main);
  line-height: 1;
  position: absolute;
  top: 32px;
  right: 36px;
  opacity: 0.85;
  letter-spacing: 0.02em;
}
.research-region {
  display: inline-block;
  font-family: var(--ff-serif);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--color-main);
  margin: 0 0 14px;
  padding: 4px 12px;
  background: var(--color-main-light);
  border-radius: 999px;
  font-weight: 500;
}
.research-body h3 {
  font-family: var(--ff-serif);
  font-size: 26px;
  margin: 0 0 18px;
  color: var(--color-text);
  letter-spacing: 0.02em;
  padding-right: 70px;  /* 番号と被らないよう */
}
.research-body p {
  margin: 0 0 24px;
  color: var(--color-text-soft);
  font-size: 16px;
  line-height: 1.9;
}
.link-arrow {
  display: inline-block;
  color: var(--color-main);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.05em;
}

/* ==========================================================================
   コラム
   ========================================================================== */
.column { background: var(--color-bg); }

.column-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 36px;
}
.column-card {
  background: #fff;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: transform .3s, box-shadow .3s;
  cursor: pointer;
}
.column-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
}
.column-img {
  aspect-ratio: 4 / 3;
  overflow: hidden;
}
.column-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s; }
.column-card:hover .column-img img { transform: scale(1.05); }

.column-body { padding: 28px 28px 32px; }
.column-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 0 0 14px;
  font-size: 13px;
}
.column-meta .cat {
  background: var(--color-main-light);
  color: var(--color-main-dark);
  padding: 4px 12px;
  border-radius: 3px;
  font-weight: 700;
}
.column-meta time {
  color: var(--color-text-soft);
  font-family: var(--ff-serif);
}
.column-body h3 {
  font-family: var(--ff-serif);
  font-size: 20px;
  line-height: 1.6;
  margin: 0 0 12px;
  color: var(--color-text);
}
.column-body p {
  margin: 0;
  font-size: 16px;
  color: var(--color-text-soft);
  line-height: 1.8;
}

/* ==========================================================================
   お知らせ / オプトアウト
   ========================================================================== */
.news { background: var(--color-bg-alt); }

.tabs {
  display: flex;
  gap: 4px;
  border-bottom: 2px solid var(--color-border);
  margin-bottom: 0;
  flex-wrap: wrap;
}
.tab {
  background: transparent;
  border: none;
  padding: 18px 28px;
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text-soft);
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: color .2s, border-color .2s;
  font-family: var(--ff-serif);
}
.tab small {
  display: block;
  font-size: 12px;
  font-weight: 400;
  color: var(--color-text-soft);
  margin-top: 2px;
  font-family: var(--ff-sans);
}
.tab:hover { color: var(--color-main); }
.tab.is-active {
  color: var(--color-main);
  border-bottom-color: var(--color-main);
}

.tab-panel { display: none; padding-top: 16px; }
.tab-panel.is-active { display: block; }

.optout-intro {
  background: var(--color-main-light);
  border-left: 4px solid var(--color-main);
  padding: 20px 28px;
  border-radius: 4px;
  margin: 16px 0 24px;
}
.optout-intro p {
  margin: 0;
  font-size: 16px;
  color: var(--color-text);
  line-height: 1.9;
}

.news-list li {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 22px 12px;
  border-bottom: 1px solid var(--color-border);
  font-size: 16px;
}
.news-list time {
  flex-shrink: 0;
  font-family: var(--ff-serif);
  color: var(--color-text-soft);
  width: 110px;
  font-size: 16px;
}
.news-cat {
  flex-shrink: 0;
  display: inline-block;
  width: 100px;
  text-align: center;
  background: #fff;
  border: 1px solid var(--color-main);
  color: var(--color-main);
  font-size: 12px;
  font-weight: 700;
  padding: 4px 0;
  border-radius: 3px;
  letter-spacing: 0.05em;
}
.news-cat.optout {
  background: var(--color-main);
  color: #fff;
}
.news-list a {
  flex: 1;
  font-weight: 500;
  color: var(--color-text);
}
.news-list a:hover {
  color: var(--color-main);
  opacity: 1;
}

/* ==========================================================================
   研究参加者の皆様へ
   ========================================================================== */
.participant {
  background: var(--color-main);
  color: #fff;
  padding: 0;
}
.participant .inner {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 0;
  align-items: stretch;
  padding: 0;
  max-width: none;
}
.participant-text {
  padding: 90px 8% 90px 8%;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.participant .kicker {
  color: #fff;
  opacity: 0.85;
  margin-bottom: 16px;
}
.participant h2 {
  font-family: var(--ff-serif);
  font-size: clamp(28px, 3.4vw, 40px);
  margin: 0 0 24px;
  line-height: 1.5;
  letter-spacing: 0.03em;
}
.participant p {
  font-size: 17px;
  line-height: 2.0;
  margin: 0 0 36px;
  max-width: 540px;
}
.participant .btn-primary {
  background: #fff;
  color: var(--color-main);
  box-shadow: 0 4px 16px rgba(0,0,0,.15);
  align-self: flex-start;
}
.participant .btn-primary:hover {
  background: var(--color-text);
  color: #fff;
}
.participant-image {
  position: relative;
  min-height: 460px;
}
.participant-image img {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
}

/* ==========================================================================
   お問い合わせ
   ========================================================================== */
.contact { background: var(--color-bg); }

.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.contact-card {
  display: block;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 48px 32px 40px;
  text-align: center;
  transition: transform .3s, box-shadow .3s, border-color .3s;
}
.contact-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  border-color: var(--color-main);
  opacity: 1;
}
.contact-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 24px;
  background: var(--color-main-light);
  color: var(--color-main);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.contact-icon svg { width: 32px; height: 32px; }
.contact-card h3 {
  font-family: var(--ff-serif);
  font-size: 20px;
  margin: 0 0 16px;
}
.contact-card p {
  font-size: 16px;
  color: var(--color-text-soft);
  line-height: 1.9;
  margin: 0 0 24px;
}

/* ==========================================================================
   フッター
   ========================================================================== */
.site-footer {
  background: var(--color-text);
  color: #E8E0D4;
  padding: 80px 0 32px;
  font-size: 16px;
}
.footer-main {
  display: grid;
  grid-template-columns: 1fr 2.5fr;
  gap: 64px;
  padding-bottom: 56px;
  border-bottom: 1px solid #4A413A;
}
.footer-logo {
  font-family: var(--ff-serif);
  font-size: 13px;
  color: #F5EDE3;
  line-height: 1.6;
  margin: 0 0 20px;
}
.footer-logo strong {
  display: inline-block;
  font-size: 19px;
  font-weight: 700;
  margin-top: 4px;
}
.footer-brand address {
  font-style: normal;
  font-size: 16px;
  line-height: 1.9;
  color: #DCD2C4;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}
.footer-nav h4 {
  font-family: var(--ff-serif);
  color: #F5EDE3;
  font-size: 16px;
  margin: 0 0 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-main);
  display: inline-block;
}
.footer-nav ul li {
  margin-bottom: 10px;
}
.footer-nav a {
  font-size: 16px;
  color: #DCD2C4;
}
.footer-nav a:hover {
  color: #fff;
  opacity: 1;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  font-size: 14px;
}
.footer-links a { color: #DCD2C4; }
.footer-links a:hover { color: #fff; opacity: 1; }
.copyright {
  font-size: 13px;
  color: #B8AE9F;
  margin: 0;
  font-family: var(--ff-serif);
}

/* ==========================================================================
   レスポンシブ：タブレット
   ========================================================================== */
@media (max-width: 1280px) {
  .site-header .inner { gap: 24px; padding: 0 24px; }
  .gnav ul { gap: 24px; }
  .gnav a { font-size: 15px; }
}

@media (max-width: 1024px) {
  .site-header .inner { height: 80px; gap: 16px; }
  .gnav ul { gap: 18px; }
  .gnav a { font-size: 15px; }

  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .research-grid { grid-template-columns: 1fr; }
  .column-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .pillars { grid-template-columns: 1fr; gap: 20px; }

  .participant .inner { grid-template-columns: 1fr; }
  .participant-image { min-height: 320px; order: -1; }
  .participant-text { padding: 60px 24px; }

  .footer-main { grid-template-columns: 1fr; gap: 40px; }
  .footer-nav { grid-template-columns: repeat(2, 1fr); }
}

/* ==========================================================================
   レスポンシブ：スマートフォン
   ========================================================================== */
@media (max-width: 768px) {
  body { font-size: 16px; }

  .top-bar { font-size: 12px; }
  .top-bar p { padding: 0 16px; }

  /* ハンバーガー */
  .hamburger {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    width: 28px;
    height: 22px;
    background: transparent;
    border: none;
    padding: 0;
  }
  .hamburger span {
    width: 100%;
    height: 2px;
    background: var(--color-text);
  }
  .gnav {
    position: fixed;
    inset: 80px 0 0 0;
    background: #fff;
    transform: translateX(100%);
    transition: transform .3s;
    padding: 32px 24px;
  }
  .gnav.is-open { transform: translateX(0); }
  .gnav ul { flex-direction: column; align-items: stretch; gap: 0; }
  .gnav li { border-bottom: 1px solid var(--color-border); }
  .gnav a { display: block; padding: 18px 0; font-size: 17px; }
  .btn-nav { display: inline-block !important; margin-top: 16px; }

  .hero-headline { padding: 30px 0 24px; }
  .hero-headline-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .hero-tagline { text-align: left; }

  .hero-visual { padding: 0 16px 40px; }
  .hero-slides { aspect-ratio: 2 / 1; }
  .hero-slide figcaption {
    left: 12px;
    bottom: 12px;
    font-size: 11px;
    padding: 6px 12px;
  }
  .hero-nav {
    right: 12px;
    bottom: 12px;
  }
  .hero-dot { width: 80px; gap: 8px; }
  .hero-dot-num { font-size: 11px; }

  .section { padding: 70px 0; }
  .section-head { margin-bottom: 40px; }

  .column-grid { grid-template-columns: 1fr; }

  .news-list li {
    flex-wrap: wrap;
    gap: 8px 16px;
  }
  .news-list time { width: auto; }
  .news-list a { flex-basis: 100%; }

  .btn-primary, .btn-secondary, .btn-outline {
    min-width: 0;
    width: 100%;
    padding: 16px 24px;
  }
  .hero-cta { flex-direction: column; }

  .footer-nav { grid-template-columns: 1fr 1fr; gap: 24px 20px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}