/* =========================================================
   BCJ Scholarship — layout.css
   コンテナ / ヘッダ / ナビ / フッタ / セクション枠組み
   ========================================================= */

/* --- Containers ------------------------------------------------------- */
.bcj-container {
  width: 100%;
  max-width: var(--bcj-wide); /* ヘッダー・フッターと左端をそろえる。読みやすさは本文側（.bcj-prose）の幅で保つ */
  margin-inline: auto;
  padding-inline: var(--bcj-gutter);
}

.bcj-container--wide { max-width: var(--bcj-wide); }
.bcj-container--narrow { max-width: 760px; }

/* --- Section ---------------------------------------------------------- */
.bcj-section {
  position: relative;
  padding-block: var(--bcj-section-y);
  background-color: var(--bcj-bg);
}

.bcj-section--tight { padding-block: var(--bcj-section-y-sm); }

/* 白とごく薄いブルーグレーを交互に使い、面の変化でリズムをつくる */
.bcj-section--soft { background-color: var(--bcj-bg-soft); }

/* 同じ色の面が続くとき（間のセクションが 0 件で非表示になったときなど）に、
   余白が二重になって「何もない時間」が長くなるのを防ぐ */
.bcj-section--soft + .bcj-section--soft,
.bcj-section:not(.bcj-section--soft):not(.bcj-section--pillars) + .bcj-section:not(.bcj-section--soft):not(.bcj-section--pillars) {
  padding-top: 0;
}

/* Intro → 3カードのように、続けて読ませたいセクションは間を詰める */
.bcj-section--intro { padding-block: var(--bcj-section-y) 0; }
.bcj-section--pillars { padding-block: var(--bcj-section-y-sm) var(--bcj-section-y); }

/* --- Section header --------------------------------------------------- */
.bcj-section__head {
  max-width: 820px;
  margin-bottom: clamp(2.25rem, 1.5rem + 3vw, 4rem);
}

.bcj-section__head--center {
  margin-inline: auto;
  text-align: center;
}

.bcj-section__title {
  font-size: var(--bcj-fs-h2);
  margin-bottom: 0.6em;
}

/* 英語の大見出し＋日本語の補足見出しの組み */
.bcj-title-en {
  display: block;
  font-family: var(--bcj-font-en);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.005em;
  line-height: 1.05;
}

.bcj-title-ja {
  display: block;
  margin-top: 0.5rem;
  font-size: clamp(1rem, 0.85rem + 0.6vw, 1.25rem);
  font-weight: 500;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--bcj-text-dim);
}

/* --- Site header ------------------------------------------------------ */
.bcj-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--bcj-header-h);
  display: flex;
  align-items: center;
}

/* 背景のぼかしは、ヘッダー本体ではなく疑似要素に付ける。
   backdrop-filter を持つ要素は、中の fixed 配置（モバイルのメニュー）の基準になってしまい、
   メニューがヘッダーの高さに閉じ込められるため。 */
.bcj-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: saturate(180%) blur(18px);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--bcj-ease), background-color 0.3s var(--bcj-ease);
}

.admin-bar .bcj-header { top: 32px; }
@media (max-width: 782px) { .admin-bar .bcj-header { top: 46px; } }

.bcj-header.is-scrolled::before {
  background: rgba(255, 255, 255, 0.94);
  border-bottom-color: var(--bcj-line);
}

.bcj-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  width: 100%;
  max-width: var(--bcj-wide);
  margin-inline: auto;
  padding-inline: var(--bcj-gutter);
}

/* --- ロゴ（文字） ------------------------------------------------------- */
.bcj-brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.55rem;
  color: var(--bcj-navy);
  white-space: nowrap;
}
.bcj-brand__name {
  font-family: var(--bcj-font-en);
  font-weight: 800;
  font-size: 1.4rem;
  letter-spacing: 0.02em;
  line-height: 1;
}
.bcj-brand__sub {
  font-family: var(--bcj-font-en);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--bcj-text-dim);
}
.bcj-brand img,
.bcj-brand__logo { max-height: 36px; width: auto; }

/* --- Global nav ------------------------------------------------------- */
.bcj-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 0.2rem + 2vw, 2.25rem);
  margin: 0;
  padding: 0;
  list-style: none;
}

.bcj-nav__item { position: relative; display: flex; align-items: center; }

.bcj-nav__link,
.bcj-nav a {
  font-family: var(--bcj-font-en);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  white-space: nowrap;
  color: var(--bcj-text);
}
.bcj-nav__ja { display: none; }

.bcj-nav__link:hover,
.bcj-nav__item:focus-within > .bcj-nav__link { color: var(--bcj-navy); }

.bcj-nav__item.is-current > .bcj-nav__link { color: var(--bcj-navy); box-shadow: inset 0 -2px 0 var(--bcj-navy); padding-block: 0.25rem; }

/* SUPPORT：目立たせるボタン */
.bcj-nav__item.is-cta > .bcj-nav__link {
  padding: 0.6rem 1.35rem;
  border-radius: var(--bcj-radius-pill);
  background: var(--bcj-navy);
  color: var(--bcj-white);
}
.bcj-nav__item.is-cta > .bcj-nav__link:hover { background: var(--bcj-navy-hover); color: var(--bcj-white); }

/* サブメニュー（SCHOLARSHIP の下：奨学金制度 / BCJ Fellow） */
.bcj-nav__toggle {
  display: none; /* 開閉ボタンは狭い画面でのみ出す */
  width: 44px;
  height: 44px;
  padding: 0;
  background: none;
  border: 0;
  cursor: pointer;
  position: relative;
}
.bcj-nav__toggle span::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 8px;
  height: 8px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: translate(-50%, -70%) rotate(45deg);
  transition: transform 0.25s var(--bcj-ease);
}
.bcj-nav__toggle[aria-expanded="true"] span::before { transform: translate(-50%, -30%) rotate(225deg); }

.bcj-subnav {
  position: absolute;
  left: -1rem;
  top: 100%;
  min-width: 220px;
  margin: 0;
  padding: 0.5rem;
  list-style: none;
  background: var(--bcj-white);
  border: 1px solid var(--bcj-line);
  border-radius: 16px;
  box-shadow: var(--bcj-shadow-hover);
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity 0.2s var(--bcj-ease), transform 0.2s var(--bcj-ease), visibility 0.2s;
}
/* 親とサブメニューの間のすき間でも閉じないようにする */
.bcj-subnav::before { content: ""; position: absolute; left: 0; right: 0; top: -14px; height: 14px; }

.bcj-nav__item.has-children:hover > .bcj-subnav,
.bcj-nav__item.has-children:focus-within > .bcj-subnav,
.bcj-nav__item.has-children.is-open > .bcj-subnav {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.bcj-subnav__link {
  display: block;
  padding: 0.7rem 1rem;
  border-radius: 10px;
  font-family: var(--bcj-font-ja);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--bcj-text);
}
.bcj-subnav__link:hover { background: var(--bcj-bg-soft); color: var(--bcj-navy); }
.bcj-subnav__link[aria-current="page"] { color: var(--bcj-navy); font-weight: 700; }

/* --- Mobile nav ------------------------------------------------------- */
.bcj-navtoggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  background: none;
  border: 0;
  cursor: pointer;
  position: relative;
  color: var(--bcj-ink);
}
.bcj-navtoggle span {
  position: absolute;
  left: 11px;
  width: 22px;
  height: 1.75px;
  background: currentColor;
  transition: transform 0.3s var(--bcj-ease), opacity 0.2s var(--bcj-ease);
}
.bcj-navtoggle span:nth-child(1) { top: 17px; }
.bcj-navtoggle span:nth-child(2) { top: 25px; }
.bcj-navtoggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(4px) rotate(45deg); }
.bcj-navtoggle[aria-expanded="true"] span:nth-child(2) { transform: translateY(-4px) rotate(-45deg); }

@media (max-width: 980px) {
  .bcj-navtoggle { display: block; }

  .bcj-nav {
    position: fixed;
    inset: var(--bcj-header-h) 0 0 0;
    overflow-y: auto;
    background: var(--bcj-white);
    padding: 0.5rem var(--bcj-gutter) 3rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 0.25s var(--bcj-ease), transform 0.25s var(--bcj-ease), visibility 0.25s;
  }
  .admin-bar .bcj-nav { top: calc(var(--bcj-header-h) + 46px); }
  .bcj-nav.is-open { opacity: 1; visibility: visible; transform: none; }

  .bcj-nav__list { flex-direction: column; align-items: stretch; gap: 0; }
  .bcj-nav__item { flex-wrap: wrap; border-bottom: 1px solid var(--bcj-line-soft); }

  .bcj-nav__link {
    flex: 1 1 0;
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    padding: 1.1rem 0.25rem;
    font-size: 1rem;
    letter-spacing: 0.06em;
  }
  .bcj-nav__ja {
    display: block;
    font-family: var(--bcj-font-ja);
    font-size: 0.8rem;
    font-weight: 400;
    letter-spacing: 0.04em;
    color: var(--bcj-text-faint);
  }
  .bcj-nav__item.is-current > .bcj-nav__link { box-shadow: none; padding-block: 1.1rem; }

  .bcj-nav__toggle { display: block; }

  /* サブメニューは開閉式の縦並びにする */
  .bcj-subnav {
    position: static;
    flex: 0 0 100%;
    display: none;
    min-width: 0;
    padding: 0 0 0.75rem 1rem;
    border: 0;
    border-radius: 0;
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    transform: none;
  }
  .bcj-subnav::before { display: none; }
  .bcj-nav__item.has-children.is-open > .bcj-subnav { display: block; }
  .bcj-nav__item.has-children:hover > .bcj-subnav,
  .bcj-nav__item.has-children:focus-within > .bcj-subnav { display: none; }
  .bcj-nav__item.has-children.is-open:hover > .bcj-subnav,
  .bcj-nav__item.has-children.is-open:focus-within > .bcj-subnav { display: block; }

  /* SUPPORT は下にボタンとして置く */
  .bcj-nav__item.is-cta { border-bottom: 0; padding-top: 1.5rem; }
  .bcj-nav__item.is-cta > .bcj-nav__link {
    flex-direction: row;
    justify-content: center;
    padding: 1rem 1.5rem;
    text-align: center;
  }
  .bcj-nav__item.is-cta .bcj-nav__ja { display: none; }
}

/* --- Footer ----------------------------------------------------------- */
.bcj-footer {
  background: var(--bcj-bg-tint);
  border-top: 1px solid var(--bcj-line);
  padding: clamp(3.5rem, 2rem + 5vw, 6rem) 0 2.25rem;
  font-size: var(--bcj-fs-small);
  color: var(--bcj-text-dim);
}

.bcj-footer__grid {
  display: grid;
  grid-template-columns: minmax(240px, 1.6fr) repeat(5, minmax(0, 1fr));
  gap: clamp(2rem, 1rem + 3vw, 3.5rem) clamp(1.25rem, 0.5rem + 2vw, 2.5rem);
  padding-bottom: 2.75rem;
  border-bottom: 1px solid var(--bcj-line);
}

.bcj-footer__brand .bcj-brand { margin-bottom: 1.1rem; }
.bcj-footer__desc { max-width: 28em; line-height: 1.9; }

.bcj-footer__heading {
  margin-bottom: 1rem;
  font-family: var(--bcj-font-en);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--bcj-ink);
}

.bcj-footer ul { margin: 0; padding: 0; list-style: none; }
.bcj-footer li + li { margin-top: 0.65rem; }
.bcj-footer a:hover { color: var(--bcj-navy); }

.bcj-footer__social {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  margin-top: 1.25rem !important;
}
.bcj-footer__social li + li { margin-top: 0; }
.bcj-footer__social a { font-weight: 600; color: var(--bcj-navy); }

.bcj-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 1.75rem;
  font-size: 0.8125rem;
  color: var(--bcj-text-faint);
}

.bcj-footer__address {
  margin-top: 1.25rem;
  font-style: normal;
  line-height: 1.8;
}

.bcj-footer__addressline {
  display: block;
  margin-bottom: 0.25rem;
  color: inherit;
}

@media (max-width: 1100px) {
  .bcj-footer__grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .bcj-footer__brand { grid-column: 1 / -1; }
}
@media (max-width: 560px) {
  .bcj-footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* --- 下層ページ -------------------------------------------------------- */
.bcj-pagehead {
  padding: clamp(3rem, 2rem + 4vw, 6rem) 0 clamp(2rem, 1.25rem + 2.5vw, 3.5rem);
  background: var(--bcj-bg-soft);
  border-bottom: 1px solid var(--bcj-line);
}
.bcj-pagehead__title { font-size: var(--bcj-fs-h2); }

.bcj-prose { max-width: 760px; }
.bcj-prose h2 { font-size: var(--bcj-fs-h3); margin: 2.5em 0 0.9em; }
.bcj-prose h3 { font-size: 1.25rem; margin: 2.2em 0 0.8em; }
.bcj-prose ul,
.bcj-prose ol { margin: 0 0 1.5em; padding-left: 1.4em; }
.bcj-prose li { margin-bottom: 0.5em; }
.bcj-prose img { border-radius: var(--bcj-radius); margin: 2rem 0; }
.bcj-prose blockquote {
  margin: 2rem 0;
  padding-left: 1.5rem;
  border-left: 3px solid var(--bcj-navy);
  color: var(--bcj-text-dim);
}
.bcj-prose table { width: 100%; border-collapse: collapse; margin: 2rem 0; }
.bcj-prose th,
.bcj-prose td {
  padding: 0.9rem 1rem;
  border-bottom: 1px solid var(--bcj-line);
  text-align: left;
  vertical-align: top;
}
.bcj-prose th { width: 30%; font-weight: 700; color: var(--bcj-ink); }

.bcj-prose > :first-child { margin-top: 0; }