/* =====================================================
   pc.css - PCレイアウト (1025px以上)
===================================================== */

/* ----- ヘッダー 2段構造 ----- */
.header {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 1920px;
  z-index: 1000;
  background: #fff;
  box-shadow: 0 2px 6px rgba(0,0,0,0.08);
  /* ヘッダー全高 = 上段(35px) + 下段(64px) */
  height: 99px;
}

/* ── ロゴ：ヘッダー全高に対して絶対配置で縦中央 ── */
.header__logo {
  position: absolute;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  flex-shrink: 0;
  z-index: 1;
}

.header__logo-img {
  height: 48px;
  width: auto;
}

/* ── 右カラム：上段ボタン＋下段ナビ ── */
.header__right {
  width: 100%;
  display: flex;
  flex-direction: column;
}

/* ── 上段：ボタンを右上に密着 ── */
.header__top {
  display: flex;
  justify-content: flex-end;
  width: 100%;
}

.header__actions {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.header__member-btn,
.header__clara-btn {
  display: block;
  line-height: 0;
  transition: opacity 0.2s;
}

.header__member-btn:hover,
.header__clara-btn:hover {
  opacity: 0.85;
}

/* 2倍書き出し画像を実寸35pxで表示 */
.header__btn-img {
  display: block;
  height: 35px;
  width: auto;
}

/* ── 下段：ナビ右寄せ ── */
.header__inner {
  display: flex;
  align-items: center;
  height: 64px;
  width: 100%;
}

/* ナビ：右寄せ */
.header__nav-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 16px;
}

.header__nav-list {
  display: flex;
}

.header__nav-item {
  position: relative;
}

.header__nav-link {
  display: flex;
  align-items: center;
  padding: 0 12px;
  font-family: var(--font-jp);
  font-size: 0.9375rem;
  font-weight: 400;
  color: #333;
  height: 64px;
  white-space: nowrap;
  transition: color 0.15s;
}

.header__nav-item.has-dropdown > .header__nav-link {
  cursor: pointer;
}

.header__nav-item:hover .header__nav-link {
  color: var(--color-green-mid);
}

.header__hamburger {
  display: none;
}

/* ----- ドロップダウン：ヘッダー全幅展開 + フェードイン ----- */
.dropdown {
  position: fixed;
  top: 99px;                /* 上段35px + 下段64px */
  /* 1段ヘッダー 80px */
  left: 0;
  width: 100%;
  background: #fff;
  border-top: 1px solid #e8e8e8;
  box-shadow: 0 8px 24px rgba(0,0,0,0.10);
  z-index: 1001;
  /* フェードイン制御 */
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition:
    opacity 0.22s ease,
    visibility 0.22s ease,
    transform 0.22s ease;
  pointer-events: none;
}

.header__nav-item:hover .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

/* ドロップダウン内部：左タイトル + 右グリッド */
.dropdown__inner {
  display: flex;
  align-items: flex-start;
  gap: 40px;
  max-width: 1366px;
  margin: 0 auto;
  padding: 28px 64px;
}

/* 左側：親メニュー名 */
.dropdown__title {
  font-family: var(--font-jp);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-green-dark);
  white-space: nowrap;
  min-width: 160px;
  padding-top: 4px;
  line-height: 1.4;
  flex-shrink: 0;
}

/* 右側：サブメニュー ピルボタン グリッド */
.dropdown__list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px 16px;
  flex: 1;
}

.dropdown__list li a {
  display: block;
  border: 1px solid var(--color-green-mid);
  border-radius: 50px;
  padding: 9px 18px;
  font-family: var(--font-jp);
  font-size: 0.875rem;
  color: #333;
  transition: background 0.15s, color 0.15s;
}

.dropdown__list li a:hover {
  background: var(--color-green-mid);
  color: #fff;
}

.dropdown__btn-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.dropdown__arrow {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-top: 1.5px solid currentColor;
  border-right: 1.5px solid currentColor;
  transform: rotate(45deg);
  flex-shrink: 0;
}

/* ドロップダウン表示中の背景オーバーレイ */
.header__nav-item.has-dropdown:hover::after {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.3);
  z-index: 1000;
  pointer-events: none;
}

/* dropdownはオーバーレイより上 */
.dropdown {
  z-index: 1001;
}

/* ── モバイル非表示 ── */
.mobile-nav, .mobile-nav__overlay {
  display: none;
}

/* ----- MV ----- */
.mv {
  padding-top: 99px;
}

.mv__slider {
  position: relative;
  width: 100%;
  height: 690px;
  /* height: 628px; */
  overflow: hidden;
}

.mv__slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.8s ease;
}

.mv__slide--active {
  opacity: 1;
}

.mv__slide-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
}

.mv__dots {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  padding: 14px 0;
  background: #fff;
}

.mv__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: none;
  background: var(--color-green-mid);
  cursor: pointer;
  transition: background 0.2s, transform 0.2s;
}

.mv__dot--active {
  background: var(--color-green-dark);
  transform: scale(1.3);
}

.mv__dot:hover {
  transform: scale(1.2);
}

/* ----- お知らせ ----- */
.info {
  background: var(--color-bg-gray);
  padding: 64px 0 72px;
}

.info__inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 40px;
}

/* リスト：2段構造（上：日付＋タグ / 下：タイトル） */
.info__list {
  border-top: 1px solid var(--color-border);
}

.info__item {
  display: block;
  padding: 20px 10px 18px;
  border-bottom: 1px solid var(--color-border);
  font-family: var(--font-jp);
  font-size: 1rem;
  line-height: 1.7;
}

.info__item-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.info__date {
  font-family: var(--font-en);
  font-size: 0.9375rem;
  color: var(--color-green-mid);
  white-space: nowrap;
}

.info__tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-green-mid);
  color: #fff;
  font-family: var(--font-jp);
  font-size: 0.8125rem;
  padding: 4px 14px;
  border-radius: 4px;
  white-space: nowrap;
  min-width: 72px;
}

.info__link {
  display: inline;
  font-family: var(--font-jp);
  font-size: 1rem;
  color: var(--color-green-dark);
  line-height: inherit;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 0.2s;
}

.info__link:hover {
  color: var(--color-green-mid);
}

.info__item > img,
.info__link > img {
  display: inline-block;
  width: 16px;
  height: 16px;
  max-width: none;
  margin: 0 0.25em;
  vertical-align: -2px;
}

.info__file {
  display: inline-flex;
  align-items: center;
  gap: 0.25em;
  margin: 0 0.1em 0 0.25em;
  color: var(--color-text);
  white-space: nowrap;
  vertical-align: -2px;
}

.info__file > img {
  display: block;
  width: 16px;
  height: 16px;
  max-width: none;
  margin: 0;
  flex-shrink: 0;
}

/* 「一覧を見る」ボタン：細長いピル型・矢印は白丸に緑矢印 */
.info__btn-wrap {
  margin-top: 48px;
  text-align: center;
}

.info__more-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background: var(--color-green-dark);
  color: #fff;
  font-family: var(--font-jp);
  font-size: 1rem;
  font-weight: 500;
  padding: 9px 40px;
  /* 上下細め・左右均等でテキスト中央 */
  border-radius: 50px;
  min-width: 240px;
  transition: opacity 0.2s;
}

.info__more-btn:hover {
  opacity: 0.85;
}

.info__more-btn > span:first-child {
  margin-right: 0;
}

/* テキスト中央 */
.info__more-arrow {
  position: absolute;
  right: 14px;
  /* 8px → 14px で少し左に */
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  background: #fff;
  border-radius: 50%;
  flex-shrink: 0;
}

.info__more-arrow span {
  display: block;
  width: 4px;
  height: 4px;
  border-top: 1.5px solid var(--color-green-dark);
  border-right: 1.5px solid var(--color-green-dark);
  transform: rotate(45deg) translate(-1px, 1px);
  margin-left: 2px;
}

/* ----- 学会誌 + SNS 2カラム ----- */
.aj-sns {
  background: #fff;
  padding: 72px 0 64px;
}

.aj-sns__inner {
  max-width: 1088px;
  margin: 0 auto;
  padding: 0 64px;
  display: flex;
  gap: 80px;
  align-items: flex-start;
}

/* ── 学会誌 カラム ── */
.aj-sns__col--journal {
  flex: 0 0 auto;
}

/* 見出し：books幅（180px×2+gap24px=384px）に揃えてセンター */
.aj-sns__col--journal .section-header,
.aj-sns__col--journal .section-header--left {
  text-align: center;
  width: 384px;
}

.journal__books {
  display: flex;
  gap: 24px;
  margin-top: 24px;
  width: 384px;
}

.journal__book {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  flex: 1;
}

.journal__book-link {
  display: block;
  transition: opacity 0.2s;
}

.journal__book-link:hover {
  opacity: 0.85;
}

.journal__book-img {
  width: 180px;
  height: auto;
  display: block;
  margin-bottom: 10px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.12);
}

/* タイトルボタン：画像と同幅・pill型・2行対応 */
.journal__book-name-btn {
  display: block;
  width: 180px;
  background: transparent;
  border: 1px solid var(--color-green-dark);
  border-radius: 50px;
  padding: 8px 12px;
  font-family: var(--font-jp);
  font-size: 0.75rem;
  color: var(--color-green-dark);
  line-height: 1.5;
  text-align: center;
  transition: background 0.2s;
}

.journal__book-name-btn:hover {
  background: var(--color-green-light);
}

/* ── SNS カラム ── */
.aj-sns__col--sns {
  flex: 1;
  align-self: flex-start;
  margin-top: 32px;
}

/* 見出し：カラム全体にセンター揃え */
.aj-sns__col--sns .section-header,
.aj-sns__col--sns .section-header--left {
  text-align: center;
}

.aj-sns__col--sns .x_link {
  width: 320px;
  margin: 18px auto 0;
}
.aj-sns__col--sns .x_link img {
  width: 100%;
  height: auto;
}
.aj-sns__col--sns .x_link img:hover {
  opacity: .6;
}



/* .sns__content {
  background: #fff;
  border: 1px solid #ddd;
  min-height: 300px;
  display: block;
  overflow: hidden;
  margin-top: 24px;
} */

/* Xタイムライン ウィジェット調整 */
/* .sns__content .twitter-timeline,
.sns__content iframe {
  display: block !important;
  width: 100% !important;
}

.sns__placeholder {
  font-family: var(--font-jp);
  font-size: 1.625rem;
  color: var(--color-green-dark);
} */

/* ----- 学術研究会 ----- */
/* ----- 学術研究会 ----- */
.research-group {
  background: var(--color-bg-gray);
  padding: 48px 0;
}

.research-group__inner {
  max-width: 1088px;
  margin: 0 auto;
  padding: 0 64px;
  display: flex;
  align-items: stretch;
  height: 280px;
}

/* 左：顕微鏡写真 */
.research-group__photo {
  flex: 0 0 42%;
  overflow: hidden;
}

.research-group__photo-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* 右：緑パネル */
.research-group__panel {
  flex: 1;
  position: relative;
  background: var(--color-green-dark);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 36px 48px;
  overflow: hidden;
  text-decoration: none;
}

.research-group__panel:hover .research-group__texture {
  opacity: 0.18;
}

/* テクスチャ（bg画像をoverlay） */
.research-group__texture {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0.12;
  transition: opacity 0.3s;
}

.research-group__content {
  position: relative;
  z-index: 1;
}

.research-group__en {
  font-family: var(--font-en);
  font-size: 1.25rem;
  font-weight: 400;
  color: rgba(255,255,255,0.9);
  display: block;
  margin-bottom: 8px;
  letter-spacing: 0.04em;
}

.research-group__title {
  font-family: var(--font-jp);
  font-size: 2.25rem;
  font-weight: 700;
  color: #fff;
}

/* 矢印ボタン：右下固定 */
.research-group__arrow-btn {
  position: absolute;
  right: 32px;
  bottom: 24px;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 2px solid rgba(255,255,255,0.8);
  border-radius: 50%;
  color: #fff;
  transition: background 0.2s, border-color 0.2s;
}

.research-group__panel:hover .research-group__arrow-btn {
  background: rgba(255,255,255,0.15);
  border-color: #fff;
}

/* ----- 地域研究会 ----- */
.geographical {
  background: #fff;
  padding: 72px 0 64px;
}

.geographical__inner {
  max-width: 1088px;
  margin: 0 auto;
  padding: 0 64px;
}

.geographical__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px 24px;
}

.geographical__item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--color-green-light);
  border: 1px solid var(--color-green-mid);
  padding: 20px 24px 20px 28px;
  border-radius: 12px;
  font-family: var(--font-jp);
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--color-green-mid);
  min-height: 80px;
  transition: background 0.2s, box-shadow 0.2s;
}

.geographical__item:hover {
  background: #c8eacf;
  box-shadow: 0 2px 10px rgba(31,170,57,0.18);
}

/* 丸付き矢印アイコン */
.geographical__item-arrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  background: var(--color-green-mid);
  border-radius: 50%;
  position: relative;
}

.geographical__item-arrow::after {
  content: '';
  display: block;
  width: 7px;
  height: 7px;
  border-top: 2px solid #fff;
  border-right: 2px solid #fff;
  transform: rotate(45deg) translate(-1px, 1px);
}

/* ----- バナー（3カラム） ----- */
.bnr-3col {
  background: var(--color-bg-gray);
  padding: 32px 0;
}

.bnr-3col__inner {
  max-width: 1088px;
  margin: 0 auto;
  padding: 0 64px;
  display: flex;
  gap: 28px;
  align-items: center;
  justify-content: center;
}

.bnr-3col__item {
  display: block;
  transition: opacity 0.2s;
}

.bnr-3col__item:hover {
  opacity: 0.85;
}

.bnr-3col__img {
  height: 90px;
  width: auto;
  max-width: 400px;
  object-fit: contain;
}

/* ----- バナーサンプル ----- */
.bnr-sample {
  background: var(--color-bg-bnr);
  padding: 56px 0;
}

.bnr-sample__inner {
  max-width: 1088px;
  margin: 0 auto;
  padding: 0 64px;
}

.bnr-sample__row--wide {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 20px;
}

.bnr-sample__row--small {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.bnr-sample__item {
  display: flex;
  align-items: center;
  justify-content: center;
  background: #fff;
}

.bnr-sample__item:hover {
  opacity: 0.85;
}

.bnr-sample__item--wide {
  width: 470px;
  height: 164px;
}

.bnr-sample__item--small {
  height: 62px;
}

.bnr-sample__text {
  font-family: var(--font-jp);
  font-size: 1.375rem;
  color: #aaa;
}

/* ── 下層ページ ── */
/*「雑草学」って何？*/
.what_ws {
  padding-top: 138px;
}
.what_ws .anchor_nav {
}
.what_ws .anchor_nav .section_inner {
  width: 80%;
  max-width: 960px;
  margin: 0 auto;
}
.what_ws .anchor_nav .section_inner > h2 {
  text-align: center;
  font-size: 2.125rem;
  color: #0f9900;
}
.what_ws .anchor_nav .section_inner > h3 {
  color: #666;
  font-weight: 500;
  text-align: center;
}
.what_ws .anchor_nav .section_inner .nav_wrap {
  margin-top: 46px;
}
.what_ws .anchor_nav .section_inner .nav_wrap > h3 {
  font-size: 1.5rem;
  font-weight: 700;
}
.what_ws .anchor_nav .section_inner .nav_wrap > ul {
  display: -webkit-box;
  display: flex;
  flex-wrap: wrap;
  -webkit-box-pack: justify;
  justify-content: space-between;
  margin-top: 14px;
}
.what_ws .anchor_nav .section_inner .nav_wrap > ul li {
  width: 32%;
  border: solid 1px #ddd;
  border-radius: 4px;
  margin-bottom: 16px;
}
.what_ws .anchor_nav .section_inner .nav_wrap > ul li a {
  display: block;
  padding: 12px 24px;
}
.what_ws .anchor_nav .section_inner .nav_wrap > ul li a:hover {
  background-color: #ddd;
}
.what_ws .anchor_nav .section_inner .nav_wrap > ul li a span {
  padding: 2px 6px;
  border-radius: 4px;
  background-color: #0f9900;
  color: #fff;
  margin-right: 8px;
}
.what_ws .content_wrap {
  width: 80%;
  max-width: 960px;
  margin: 0 auto;
  padding-bottom: 56px;
  border-bottom: solid 1px #ccc;
}
.what_ws .content_wrap .section_inner {
  padding-top: 120px;
}
.what_ws .content_wrap .section_inner .return_nav {
  width: 100%;
  text-align: right;
}
.what_ws .content_wrap .section_inner .return_nav a {
  font-size: 1.125rem;
  color: #004d99;
  text-decoration: underline;
}
.what_ws .content_wrap .section_inner .return_nav a:hover {
  text-decoration: none;
}
.what_ws .content_wrap .section_inner > h2 {
  font-size: 1.75rem;
  line-height: 1.5em;
  font-weight: 700;
  text-align: center;
  margin-bottom: 68px;
}
.what_ws .content_wrap .section_inner > h2 span {
  font-size: 1.5rem;
  background-color: #0f9900;
  color: #fff;
  border-radius: 6px;
  padding: 3px 8px;
  margin-right: 12px;
}
.what_ws .content_wrap .section_inner > h3 {
  font-size: 1.25rem;
  line-height: 1.5em;
  font-weight: 700;
  margin-bottom: 18px;
}
.what_ws .content_wrap .section_inner .two_column {
  display: -webkit-box;
  display: flex;
  -webkit-box-pack: justify;
  justify-content: space-between;
  margin-bottom: 86px;
}
.what_ws .content_wrap .section_inner .two_column .text_wrap {
  width: 52%;
}
.what_ws .content_wrap .section_inner .two_column .text_wrap > h4 {
  font-weight: 600;
  margin-bottom: 8px;
}
.what_ws .content_wrap .section_inner .two_column .text_wrap > p {
  line-height: 1.7em;
  margin-bottom: 16px;
}
.what_ws .content_wrap .section_inner .two_column .photo_wrap {
  width: 44%;
}
.what_ws .content_wrap .section_inner .two_column .photo_wrap .photo {
  width: 100%;
}
.what_ws .content_wrap .section_inner .two_column .photo_wrap .photo img {
  width: 100%;
  height: auto;
}
.what_ws .content_wrap .section_inner .two_column .photo_wrap .caption {
  font-size: 0.875rem;
  color: #555;
  text-align: center;
  margin-top: 6px;
}
.what_ws .content_wrap .section_inner .one_column {
  margin-bottom: 86px;
}
.what_ws .content_wrap .section_inner .one_column > p {
  line-height: 1.7em;
  margin-bottom: 16px;
}
.what_ws .content_wrap .section_inner .one_column .photo_wrap {
  width: 56%;
  margin: 56px auto 0;
}
.what_ws .content_wrap .section_inner .one_column .photo_wrap .photo {
  width: 100%;
}
.what_ws .content_wrap .section_inner .one_column .photo_wrap .photo img {
  width: 100%;
  height: auto;
}
.what_ws .content_wrap .section_inner .one_column .photo_wrap .caption {
  font-size: 0.875rem;
  color: #555;
  text-align: center;
  margin-top: 6px;
}
.one_column a {
  font-weight: 600;
  color: #004d99;
  text-decoration: underline;
}
.one_column a:hover {
  text-decoration: none;
}
.ending {
  text-align: right;
  line-height: 1.7em;
}
.copyright {
  text-align: center;
  font-size: 0.875rem;
  line-height: 1.7em;
  margin: 56px 0 36px;
}
.return_top {
  width: 400px;
  margin: 68px auto 24px;
}
.return_top a {
  display: block;
  text-align: center;
  border: solid 1px #ccc;
  border-radius: 8px;
  padding: 10px 14px;
}
.return_top a:hover {
  background-color: #ccc;
}