/*
 * page-nav.css
 * ----
 * フッターのページナビゲーション (リスト型セマンティクス、Bootstrap 非依存)。
 *
 * 構造:
 *   <nav class="page-nav">
 *     <ul>
 *       <li><a class="page-nav-link page-nav-prev">…</a></li>   (任意)
 *       <li><a class="page-nav-link page-nav-top">…</a></li>    (常時)
 *       <li><a class="page-nav-link page-nav-next">…</a></li>   (任意)
 *     </ul>
 *   </nav>
 *
 * <li> は display: contents で透過させ、<a> を直接グリッド項目にする。
 * グリッド列は <a> のクラスから決定するため、prev / next が欠けても
 * top は中央、prev は左、next は右の位置を保つ。
 */

.page-nav {
  width: 100%;
  margin: 0.5rem 0;
  padding: 0.5rem 0;
  border-top: 1px solid #e4e4e7;
}

.page-nav ul {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: stretch;
  gap: 1rem;
  width: 100%;
  margin: 0;
  padding: 0;
  list-style: none;
}

/*
 * <li> をレイアウトから抜き、<a> を <ul> のグリッド項目に昇格。
 * リスト・セマンティクス (role=list / listitem) はモダンブラウザでは
 * display: contents 越しでも保持される (Firefox 70+, Chrome 105+, Safari 17+)。
 */
.page-nav li {
  display: contents;
}

/* グリッド列の固定割り当て (XSL の出力順に依存しない) */
.page-nav-prev { grid-column: 1; }
.page-nav-top  { grid-column: 2; }
.page-nav-next { grid-column: 3; }

/* ====== prev / next: カード ====== */

.page-nav-prev,
.page-nav-next {
  display: grid;
  grid-template-rows: auto auto;
  align-items: center;
  column-gap: 1rem;
  padding: 1rem 1.25rem;
  background: #f5f5f7;
  border: 1px solid #e4e4e7;
  border-radius: 0.75rem;
  color: #18181b;
  text-decoration: none;
  transition: border-color .15s, background-color .15s;
}

.page-nav-prev { grid-template-columns: auto 1fr; }
.page-nav-next { grid-template-columns: 1fr auto; }

.page-nav-prev:hover, .page-nav-prev:focus-visible,
.page-nav-next:hover, .page-nav-next:focus-visible {
  background: #ffffff;
  border-color: #a5b4fc;
  color: #18181b;
  text-decoration: none;
}

/* 矢印ボックス (擬似要素で生成) */
.page-nav-prev::before,
.page-nav-next::after {
  content: "";
  width: 2.5rem;
  height: 2.5rem;
  background-color: #e0e7ff;
  border-radius: 0.5rem;
  background-repeat: no-repeat;
  background-position: center;
  background-size: 1.25rem 1.25rem;
  grid-row: 1 / 3;
  align-self: center;
}

.page-nav-prev::before {
  grid-column: 1;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2318181b' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><line x1='19' y1='12' x2='5' y2='12'/><polyline points='12 19 5 12 12 5'/></svg>");
}

.page-nav-next::after {
  grid-column: 2;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2318181b' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><line x1='5' y1='12' x2='19' y2='12'/><polyline points='12 5 19 12 12 19'/></svg>");
}

/* テキスト配置 */
.page-nav-prev > .page-nav-label,
.page-nav-prev > .page-nav-title { grid-column: 2; text-align: left;  }
.page-nav-next > .page-nav-label,
.page-nav-next > .page-nav-title { grid-column: 1; text-align: right; }

.page-nav-prev > .page-nav-label,
.page-nav-next > .page-nav-label { grid-row: 1; }
.page-nav-prev > .page-nav-title,
.page-nav-next > .page-nav-title { grid-row: 2; }

.page-nav-label {
  font-size: 0.72rem;
  font-weight: 500;
  color: #71717a;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  line-height: 1.4;
  white-space: nowrap;
}

.page-nav-title {
  margin-top: 0.15rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: #18181b;
  line-height: 1.35;
}

/* ====== top: 中央、ボーダーレス、円形アイコン ====== */

.page-nav-top {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.5rem 1.5rem;
  color: #18181b;
  text-decoration: none;
  white-space: nowrap;
}

.page-nav-top:hover, .page-nav-top:focus-visible {
  text-decoration: none;
  color: #18181b;
}

.page-nav-top::after {
  content: "";
  width: 2.5rem;
  height: 2.5rem;
  border: 1.5px solid #d4d4d8;
  border-radius: 50%;
  background-repeat: no-repeat;
  background-position: center;
  background-size: 1rem 1rem;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2318181b' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><line x1='12' y1='19' x2='12' y2='5'/><polyline points='5 12 12 5 19 12'/></svg>");
  transition: border-color .15s, background-color .15s;
}

.page-nav-top:hover::after,
.page-nav-top:focus-visible::after {
  border-color: #a5b4fc;
  background-color: #f5f5f7;
}

/* ====== モバイル: 縦積み ====== */

@media (max-width: 575.98px) {
  .page-nav ul {
    grid-template-columns: 1fr minmax(max-content, auto) 1fr ;
  }
  .page-nav-prev,
  .page-nav-top,
  .page-nav-next {
    grid-column: 1;     /* 全項目を 1 列に揃える (auto-flow が行に積む) */
  }
}