/* 教育ツール「このサイトについて」：education.css のトークンと黒板ヒーローを共用 */
.ab .ed-hero h1 { letter-spacing: 0.06em; }
.ab-layout { align-items: start; }
.ab-toc { padding-bottom: 0.4rem; }
.ab-toc .ed-block { border-bottom: 0; }
.ab-toc .ed-block h2 i { color: var(--ed-accent); }
.ab-toc-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 1px; }
.ab-toc-list a { display: flex; align-items: center; gap: 0.6rem; padding: 0.4rem 0.5rem; border-radius: var(--ed-radius); color: var(--ed-text); text-decoration: none; font-size: 0.88rem; }
.ab-toc-list a:hover { background: var(--ed-accent-bg); color: var(--ed-accent); }
.ab-toc-list b { flex: none; display: inline-flex; align-items: center; justify-content: center; width: 20px; height: 20px; border-radius: 4px; border: 1px solid var(--ed-border); background: var(--ed-surface); color: var(--ed-sub); font-size: 0.72rem; font-variant-numeric: tabular-nums; }
.ab-toc-list a:hover b { background: var(--ed-accent); border-color: var(--ed-accent); color: var(--ed-on-accent); }

.ab-main { min-width: 0; display: flex; flex-direction: column; gap: 1.2rem; }
.ab-sec { scroll-margin-top: 1rem; padding: 1.3rem 1.5rem 1.4rem; background: var(--ed-surface); border: 1px solid var(--ed-border); border-radius: var(--ed-radius); }
.ab-sec h2 { display: flex; align-items: center; gap: 0.65rem; margin: 0 0 0.9rem; padding-bottom: 0.7rem; border-bottom: 1px solid var(--ed-border); font-size: 1.15rem; font-weight: 700; line-height: 1.4; }
.ab-sec h2 b { flex: none; display: inline-flex; align-items: center; justify-content: center; width: 24px; height: 24px; border-radius: 4px; background: var(--ed-accent); color: var(--ed-on-accent); font-size: 0.82rem; font-variant-numeric: tabular-nums; }
.ab-sec h3 { margin: 1.4rem 0 0.5rem; font-size: 0.98rem; font-weight: 700; }
.ab-sec p { margin: 0 0 0.8rem; }
.ab-sec p:last-child { margin-bottom: 0; }
.ab-sec a { color: var(--ed-accent); text-underline-offset: 2px; }
.ab-sec strong { font-weight: 700; }
.ab-small { font-size: 0.82rem; color: var(--ed-sub); }

/* 目的：特長つきリスト */
.ab-points { list-style: none; margin: 1rem 0 0; padding: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 0.7rem; }
.ab-points li { display: grid; grid-template-columns: 2rem 1fr; gap: 0.7rem; padding: 0.8rem 0.9rem; border: 1px solid var(--ed-border); border-radius: var(--ed-radius); background: var(--ed-bg); }
.ab-points i { color: var(--ed-accent); font-size: 1.1rem; line-height: 1.7; text-align: center; }
.ab-points strong { display: block; font-size: 0.93rem; }
.ab-points span { display: block; font-size: 0.85rem; color: var(--ed-sub); line-height: 1.65; }

/* 使い方：手順 */
.ab-steps { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; }
.ab-steps li { position: relative; display: grid; grid-template-columns: 2rem 1fr; gap: 0.9rem; padding-bottom: 1rem; }
.ab-steps li:last-child { padding-bottom: 0; }
.ab-steps li::before { content: ""; position: absolute; left: 1rem; top: 2.1rem; bottom: 0.1rem; border-left: 2px dashed var(--ed-border); }
.ab-steps li:last-child::before { display: none; }
.ab-steps b { position: relative; z-index: 1; display: inline-flex; align-items: center; justify-content: center; width: 2rem; height: 2rem; border: 2px solid var(--ed-accent); border-radius: 6px; background: var(--ed-surface); color: var(--ed-accent); font-size: 0.95rem; font-variant-numeric: tabular-nums; }
.ab-steps strong { display: block; margin-top: 0.1rem; }
.ab-steps span { display: block; font-size: 0.88rem; color: var(--ed-sub); }

.ab-list { margin: 0 0 0.8rem; padding-left: 1.2rem; }
.ab-list li { margin-bottom: 0.5rem; padding-left: 0.2rem; }
.ab-list li::marker { color: var(--ed-accent); }

/* 学年の色 */
.ab-bands { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 0.6rem 0 0.7rem; }
.ab-bands span { display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.35rem 0.7rem; border: 1px solid var(--ed-border); border-radius: var(--ed-radius); background: var(--ed-surface); font-size: 0.85rem; box-shadow: inset 0 -3px 0 var(--gb); }
.ab-bands i { display: block; width: 14px; height: 14px; border-radius: 3px; background: var(--gb); }

/* 教科 */
.ab-subjects { list-style: none; margin: 0.6rem 0 0.7rem; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0.45rem; }
.ab-subjects li { display: grid; grid-template-columns: 1.5em 1fr auto; align-items: center; gap: 0.45rem; padding: 0.45rem 0.65rem; border: 1px solid var(--ed-border); border-radius: var(--ed-radius); background: var(--ed-bg); font-size: 0.88rem; }
.ab-subjects i { color: var(--sc, var(--ed-sub)); text-align: center; }
.ab-subjects em { font-style: normal; font-size: 0.75rem; color: var(--ed-sub); font-variant-numeric: tabular-nums; }

/* 特長 */
.ab-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 0.7rem; }
.ab-cols > div { padding: 0.9rem 1rem; border: 1px solid var(--ed-border); border-radius: var(--ed-radius); background: var(--ed-bg); }
.ab-cols h3 { margin: 0 0 0.35rem; font-size: 0.95rem; }
.ab-cols h3::before { content: ""; display: inline-block; width: 6px; height: 1em; margin-right: 0.5em; vertical-align: -0.15em; border-radius: 1px; background: var(--ed-accent); }
.ab-cols p { font-size: 0.87rem; color: var(--ed-sub); }

/* よくある質問 */
.ab-sec details { border: 1px solid var(--ed-border); border-radius: var(--ed-radius); background: var(--ed-bg); margin-bottom: 0.5rem; }
.ab-sec details:last-child { margin-bottom: 0; }
.ab-sec summary { cursor: pointer; padding: 0.7rem 2.4rem 0.7rem 2.6rem; position: relative; font-weight: 700; font-size: 0.92rem; list-style: none; }
.ab-sec summary::-webkit-details-marker { display: none; }
.ab-sec summary::before { content: "Q"; position: absolute; left: 0.75rem; top: 0.7rem; width: 1.3rem; height: 1.3rem; display: inline-flex; align-items: center; justify-content: center; border-radius: 4px; background: var(--ed-accent); color: var(--ed-on-accent); font-size: 0.72rem; }
.ab-sec summary::after { content: "\f078"; font-family: "Font Awesome 6 Free"; font-weight: 900; position: absolute; right: 0.9rem; top: 0.85rem; font-size: 0.7rem; color: var(--ed-sub); }
.ab-sec details[open] summary::after { content: "\f077"; }
.ab-sec details p { padding: 0 1rem 0.9rem 2.6rem; margin: 0; font-size: 0.9rem; color: var(--ed-sub); }
.ab-sec summary:hover { color: var(--ed-accent); }

/* 問い合わせ */
.ab-links { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: 1rem; }
.ab-btn { display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.6rem 1rem; border: 1px solid var(--ed-border); border-radius: var(--ed-radius); background: var(--ed-surface); color: var(--ed-text) !important; font-size: 0.9rem; text-decoration: none; }
.ab-btn i { color: var(--ed-accent); }
.ab-btn:hover { border-color: var(--ed-accent); color: var(--ed-accent) !important; }
.ab-btn-main { background: var(--ed-accent); border-color: var(--ed-accent); color: var(--ed-on-accent) !important; }
.ab-btn-main i { color: inherit; }
.ab-btn-main:hover { color: var(--ed-on-accent) !important; opacity: 0.9; }

:is(.ab-toc-list a, .ab-sec summary, .ab-btn, .ab-sec a):focus-visible { outline: 2px solid var(--ed-accent); outline-offset: 2px; }

@media (max-width: 860px) {
  .ab-toc { display: block; position: static; max-height: none; }
  .ab-toc-list { display: grid; grid-template-columns: 1fr 1fr; }
  .ab-sec { padding: 1.05rem 1rem 1.15rem; }
  .ab-points, .ab-cols { grid-template-columns: 1fr; }
  .ab-subjects { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 420px) {
  .ab-toc-list, .ab-subjects { grid-template-columns: 1fr; }
}

/* ===== 図 ===== */
.ab-fig { margin: 1.1rem 0 0.4rem; padding: 1rem 1.1rem 1.1rem; border: 1px solid var(--ed-border); border-radius: var(--ed-radius); background: var(--ed-bg); }
.ab-fig[hidden] { display: none; }
.ab-figtitle { margin: 0 0 0.8rem; font-size: 0.85rem; font-weight: 700; color: var(--ed-sub); }
.ab-figtitle small { display: block; margin-top: 0.1rem; font-size: 0.74rem; font-weight: 400; }

/* 便利webツール ⊃ 教育ツール */
.aw-all { padding: 0.9rem 1rem; border: 2px solid var(--ed-border); border-radius: var(--ed-radius); background: var(--ed-surface); }
.aw-head { display: flex; align-items: baseline; gap: 0.5rem; flex-wrap: wrap; }
.aw-head i { align-self: center; color: var(--ed-accent); }
.aw-head strong { font-size: 0.98rem; }
.aw-head span { font-size: 0.8rem; color: var(--ed-sub); }
.aw-head b { font-size: 1.15rem; color: var(--ed-text); font-variant-numeric: tabular-nums; }
.aw-chips { list-style: none; margin: 0.6rem 0 0.9rem; padding: 0; display: flex; flex-wrap: wrap; gap: 0.35rem; }
.aw-chips li { padding: 0.2rem 0.55rem; border: 1px dashed var(--ed-border); border-radius: var(--ed-radius); font-size: 0.78rem; color: var(--ed-sub); }
.aw-edu { padding: 0.8rem 0.9rem 0.85rem; border: 2px solid var(--ed-accent); border-radius: var(--ed-radius); background: var(--ed-accent-bg); }
.aw-edu .aw-head b { color: var(--ed-accent); }
.aw-axes { list-style: none; margin: 0.65rem 0 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0.45rem; }
.aw-axes li { display: flex; align-items: center; justify-content: center; gap: 0.45rem; padding: 0.45rem 0.4rem; border: 1px solid var(--ed-accent); border-radius: var(--ed-radius); background: var(--ed-surface); color: var(--ed-accent); font-size: 0.86rem; font-weight: 700; }
.ab-sec .aw-note { margin: 0.55rem 0 0; font-size: 0.78rem; color: var(--ed-sub); }
.aw-meter { height: 8px; margin-top: 0.9rem; border-radius: 4px; background: var(--ed-off); overflow: hidden; }
.aw-meter i { display: block; height: 100%; width: var(--w, 0%); border-radius: 4px; background: var(--ed-accent); }
.ab-sec .aw-meter-l { margin: 0.35rem 0 0; font-size: 0.76rem; color: var(--ed-sub); }
.aw-meter-l b { color: var(--ed-text); font-variant-numeric: tabular-nums; }

/* 絞り込みの流れ */
.af-rows { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 0.5rem; }
.af-row { display: grid; grid-template-columns: 11.5em minmax(0, 1fr) 2.6em; align-items: center; gap: 0.7rem; font-size: 0.85rem; }
.af-l { display: flex; align-items: center; gap: 0.45rem; min-width: 0; }
.af-l em { flex: none; display: inline-flex; align-items: center; justify-content: center; width: 1.25rem; height: 1.25rem; border-radius: 4px; background: var(--ed-accent); color: var(--ed-on-accent); font-style: normal; font-size: 0.72rem; font-weight: 700; }
.af-bar { height: 22px; border-radius: var(--ed-radius); background: var(--ed-off); overflow: hidden; }
.af-bar i { display: block; height: 100%; width: var(--w, 0%); border-radius: var(--ed-radius); background: var(--ed-range); }
.af-row:last-child .af-bar i { background: var(--ed-accent); }
.af-n { text-align: right; font-size: 1.05rem; font-variant-numeric: tabular-nums; color: var(--ed-text); }
.af-replay { margin-top: 0.8rem; display: inline-flex; align-items: center; gap: 0.4rem; padding: 0.3rem 0.7rem; border: 1px solid var(--ed-border); border-radius: var(--ed-radius); background: var(--ed-surface); color: var(--ed-sub); font: inherit; font-size: 0.78rem; cursor: pointer; }
.af-replay:hover { border-color: var(--ed-accent); color: var(--ed-accent); }
.af-replay:focus-visible { outline: 2px solid var(--ed-accent); outline-offset: 2px; }

/* 学年の範囲 */
.ar-row { display: grid; grid-template-columns: 7.2em minmax(0, 1fr) 8.2em; align-items: end; gap: 0.7rem; padding: 0.4rem 0; }
.ar-row + .ar-row { border-top: 1px dashed var(--ed-border); }
.ar-pick, .ar-res { line-height: 26px; font-size: 0.85rem; font-weight: 700; }
.ar-cells { display: grid; grid-template-columns: repeat(10, minmax(0, 1fr)); gap: 3px; padding-top: 1.1rem; }
.ar-c { position: relative; height: 26px; border-radius: 4px; background: var(--ed-off); color: var(--ed-sub); font-size: 0.66rem; line-height: 26px; text-align: center; }
.ar-c.on { background: var(--gb); color: var(--gb-on); }
.ar-c.sel { outline: 2px solid var(--ed-text); outline-offset: 1px; font-weight: 700; }
.ar-c.sel::after { content: "▼"; position: absolute; left: 0; right: 0; top: -1.15rem; line-height: 1; text-align: center; font-size: 0.7rem; color: var(--ed-text); }
.ar-res { display: inline-flex; align-items: center; gap: 0.35rem; font-size: 0.82rem; }
.ar-res.ok { color: var(--ed-accent); }
.ar-res.ng { color: var(--ed-sub); }
.ar-axis { margin-top: 0.3rem; padding: 0 calc(8.2em + 0.7rem) 0 calc(7.2em + 0.7rem); display: flex; font-size: 0.72rem; color: var(--ed-sub); }
.ar-axis span { text-align: center; }
.ar-axis span:nth-child(1) { width: 60%; }
.ar-axis span:nth-child(2) { width: 30%; }
.ar-axis span:nth-child(3) { width: 10%; }

/* 現在位置の目次 */
.ab-toc-list a.is-cur { background: var(--ed-accent-bg); color: var(--ed-accent); font-weight: 700; }
.ab-toc-list a.is-cur b { background: var(--ed-accent); border-color: var(--ed-accent); color: var(--ed-on-accent); }

/* 読み進めの目盛り */
.ab-progress { position: fixed; top: 0; left: 0; right: 0; z-index: 60; height: 3px; pointer-events: none; }
.ab-progress i { display: block; height: 100%; width: 100%; background: var(--ed-accent); transform: scaleX(0); transform-origin: 0 50%; }

/* ===== 動き（JS が ab-anim を付けたときだけ。動きを減らす設定・軽量モードでは付かない） ===== */
@keyframes abPop { 0% { transform: scale(0.5); opacity: 0; } 70% { transform: scale(1.12); opacity: 1; } 100% { transform: scale(1); } }


.ab-anim .ab-rv { opacity: 0; translate: 0 36px; transition: opacity 0.8s var(--ease-out), translate 1s var(--ease-out); }
.ab-anim .ab-rv.is-in { opacity: 1; translate: 0 0; }
.ab-anim .ab-rv.is-in > h2 b { animation: abPop 0.6s var(--ease-out) 0.2s both; }
.ab-anim .ab-rv > h2 { background: linear-gradient(var(--ed-accent), var(--ed-accent)) left bottom / 0 2px no-repeat; transition: background-size 1s var(--ease-out) 0.3s; }
.ab-anim .ab-rv.is-in > h2 { background-size: 100% 2px; }

.ab-anim [data-stg] > * { opacity: 0; translate: 0 24px; transition: opacity 0.7s var(--ease-out), translate 0.9s var(--ease-out); transition-delay: calc(var(--i, 0) * var(--stg, 70ms)); }
.ab-anim [data-stg].is-in > * { opacity: 1; translate: 0 0; }
.ab-anim .ab-steps li::before { transform: scaleY(0); transform-origin: 50% 0; transition: transform 0.4s ease; transition-delay: calc(var(--i, 0) * var(--stg, 70ms) + 0.2s); }
.ab-anim .ab-steps.is-in li::before { transform: scaleY(1); }
.ab-anim .ab-steps.is-in b { animation: abPop 0.4s ease both; animation-delay: calc(var(--i, 0) * var(--stg, 70ms)); }

.ab-anim .aw-meter i, .ab-anim .af-bar i { transition: width 0.9s cubic-bezier(.2,.7,.2,1); transition-delay: calc(var(--i, 0) * 0.35s); }
.ab-anim .ar-c { transition: background-color 0.35s ease, color 0.35s ease; transition-delay: calc(var(--i, 0) * 70ms); }
.ab-anim .ab-range:not(.is-in) .ar-c.on { background: var(--ed-off); color: var(--ed-sub); }
.ab-anim .ar-c.sel::after, .ab-anim .ar-res { opacity: 0; transition: opacity 0.4s ease; }
.ab-anim .ab-range.is-in .ar-c.sel::after, .ab-anim .ab-range.is-in .ar-res { opacity: 1; transition-delay: calc(var(--rd, 0) * 1ms + 700ms); }

@media (max-width: 860px) {
  .aw-axes { grid-template-columns: 1fr; }
  .af-row { grid-template-columns: minmax(0, 1fr) 2.4em; row-gap: 0.25rem; }
  .af-bar { grid-column: 1 / -1; grid-row: 2; }
  .ar-row { grid-template-columns: minmax(0, 1fr) auto; gap: 0.2rem 0.7rem; }
  .ar-cells { grid-column: 1 / -1; grid-row: 2; }
  .ar-axis { padding-left: 0; padding-right: 0; }
}

/* 目次・図・FAQ の動き */
.ab-anim .ab-toc { animation: edRise 0.8s var(--ease-out) 0.3s both; }
.ab-anim .ab-toc-list li { animation: edRise 0.7s var(--ease-out) calc(var(--i, 0) * 70ms + 0.5s) both; }
.ab-anim .ab-fig { opacity: 0; scale: 0.97; transition: opacity 0.8s var(--ease-out), scale 1s var(--ease-out); }
.ab-anim .ab-fig.is-in { opacity: 1; scale: 1; }
.ab-anim .aw-chips li { opacity: 0; scale: 0.8; transition: opacity 0.5s var(--ease-out), scale 0.6s var(--ease-out); transition-delay: calc(var(--i, 0) * 60ms + 0.2s); }
.ab-anim .ab-fig.is-in .aw-chips li { opacity: 1; scale: 1; }
.ab-anim .aw-axes li { opacity: 0; translate: 0 12px; transition: opacity 0.6s var(--ease-out), translate 0.7s var(--ease-out); }
.ab-anim .ab-fig.is-in .aw-axes li { opacity: 1; translate: 0 0; }
.ab-anim .ab-fig.is-in .aw-axes li:nth-child(2) { transition-delay: 0.15s; }
.ab-anim .ab-fig.is-in .aw-axes li:nth-child(3) { transition-delay: 0.3s; }
.ab-anim details[open] > :not(summary) { animation: edRise 0.5s var(--ease-out) both; }