/* 『自由エネルギー原理を哲学する』Web付録の部品。site.css の後に読み込む。
   数式はHTMLだけで組む（外部ライブラリなし）。 */

body.appendix .site { max-width: 1160px; }
body.appendix .column { max-width: 44em; }

/* ---------- 数式の基本 ---------- */

var, .v {
  font-family: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, serif;
  font-style: italic;
}
sub, sup { font-size: .72em; line-height: 0; }
.rm { font-style: normal; }

.eq {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin: 1.2rem 0;
  padding: .9rem 1.1rem;
  background: var(--paper-deep);
  font-family: var(--serif);
  font-size: 1.08rem;
  line-height: 1.6;
  overflow-x: auto;
}
.eq .expr { white-space: nowrap; }
.eq .no { flex: none; color: var(--muted); font-size: .9rem; }
.eq.key { border-left: 3px solid var(--ai); }

.frac {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  vertical-align: middle;
  margin: 0 .15em;
  font-size: .92em;
  line-height: 1.3;
}
.frac > span:first-child { padding: 0 .3em .05em; border-bottom: 1px solid currentColor; }
.frac > span:last-child { padding: .05em .3em 0; }

.ub {
  display: inline-grid;
  justify-items: center;
  vertical-align: top;
  margin: 0 .2em;
}
.ub > .e { white-space: nowrap; }
.ub > small {
  margin-top: .35em;
  padding-top: .2em;
  border-top: 1px solid var(--rule-strong);
  font-family: var(--sans);
  font-size: .72rem;
  font-style: normal;
  letter-spacing: .08em;
  color: var(--ai);
  white-space: nowrap;
}

.say {
  margin: 1rem 0 0;
  padding: .7rem 1rem;
  border-left: 2px solid var(--ai);
}
.say strong {
  display: block;
  margin-bottom: .2rem;
  font-size: .8rem;
  letter-spacing: .1em;
  color: var(--ai);
}
.say p { margin: 0; }

.note strong { display: block; margin-bottom: .2rem; color: var(--ink); }

/* ---------- ページ冒頭 ---------- */

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: .3rem 1.4rem;
  margin: 1.1rem 0 0;
  padding: 0;
  list-style: none;
  color: var(--muted);
  font-size: .88rem;
}
.prose :is(.meta, .tags) > li + li { margin-top: 0; } /* 横並びは gap で間をあける */

.contents {
  margin: 1.8rem 0 0;
  padding: 1rem 1.2rem;
  border: 1px solid var(--rule);
}
.contents p {
  margin: 0 0 .4rem;
  color: var(--muted);
  font-size: .8rem;
  letter-spacing: .12em;
}
.contents ol {
  margin: 0;
  padding-left: 1.5em;
  columns: 2;
  column-gap: 2rem;
  font-size: .95rem;
}
.contents li { break-inside: avoid; }
.contents a { text-decoration: none; }
.contents a:hover { text-decoration: underline; }

.section > h2 .chap {
  margin-left: .8em;
  font-family: var(--sans);
  font-size: .78rem;
  font-weight: 400;
  letter-spacing: .06em;
  color: var(--muted);
}

/* ---------- 図解の部品 ---------- */

.flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .6rem;
  margin: 1.2rem 0;
}
.flow > div {
  flex: 1 1 9rem;
  padding: .8rem 1rem;
  border: 1px solid var(--rule-strong);
  text-align: center;
}
.flow b { display: block; font-family: var(--serif); font-size: 1.3rem; font-weight: 500; }
.flow span { font-size: .85rem; color: var(--muted); }
.flow .arrow { color: var(--rule-strong); font-size: 1.4rem; }

.symbols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .8rem 1.2rem;
  margin: 1.2rem 0 0;
}
.symbols > div { padding: .7rem .9rem; background: var(--paper-deep); }
.symbols dt { font-family: var(--serif); font-size: 1.1rem; }
.symbols dd { margin: .2rem 0 0; font-size: .9rem; color: var(--ink-soft); }

.steps {
  margin: 1.2rem 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}
.steps > li {
  position: relative;
  padding: .9rem 0 .9rem 2.6rem;
  border-top: 1px solid var(--rule);
}
.steps > li:last-child { border-bottom: 1px solid var(--rule); }
.steps > li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 0;
  top: 1rem;
  width: 1.7rem;
  height: 1.7rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--ai);
  border-radius: 50%;
  color: var(--ai);
  font-family: var(--serif);
  font-size: .9rem;
}
.steps .label { margin: 0 0 .3rem; color: var(--muted); font-size: .9rem; }
.steps .formula { font-family: var(--serif); font-size: 1.05rem; overflow-x: auto; white-space: nowrap; }
.steps p { margin: .4rem 0 0; font-size: .92rem; }
.steps > li.result .formula { color: var(--ai); font-weight: 600; }

.bound {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1rem;
  margin: 1.2rem 0;
  text-align: center;
}
.bound > div { padding: .9rem; border: 1px solid var(--rule-strong); }
.bound span { display: block; font-size: .8rem; letter-spacing: .08em; color: var(--muted); }
.bound strong { font-family: var(--serif); font-size: 1.25rem; font-weight: 500; }
.bound .sign { font-family: var(--serif); font-size: 1.8rem; color: var(--ai); }

.pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 1.2rem 0;
}
.pair > div { padding: .8rem 1rem; border-top: 2px solid var(--ai); }
.pair h3 { margin: 0 0 .3rem; font-family: var(--serif); font-size: 1.05rem; }
.pair p { margin: 0; font-size: .92rem; color: var(--ink-soft); }

.compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 1.2rem 0;
}
.compare > div { padding: .9rem 1rem; border: 1px solid var(--rule-strong); }
.compare span { display: block; font-size: .8rem; letter-spacing: .1em; color: var(--muted); }
.compare b { display: block; font-weight: 500; font-size: .95rem; }
.compare strong { display: block; margin-top: .4rem; font-family: var(--serif); color: var(--ai); }

.map2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 1.2rem 0;
}
.map2 > div { padding: .9rem 1rem; border: 1px solid var(--rule-strong); text-align: center; }
.map2 span { display: block; font-size: .78rem; letter-spacing: .08em; color: var(--muted); }
.map2 b { font-family: var(--serif); font-size: 1.3rem; font-weight: 500; margin: 0 .5rem; }
.map2 .arrow { display: inline; margin: 0 .2rem; color: var(--ai); font-family: var(--serif); font-size: 1.1rem; }
.map2 p { margin: .3rem 0 0; font-size: .9rem; }

.timeline {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: .5rem .6rem;
  align-items: center;
  margin: 1.2rem 0;
  text-align: center;
}
.timeline .t { font-size: .78rem; letter-spacing: .1em; color: var(--muted); }
.timeline .s, .timeline .o { padding: .6rem .3rem; border: 1px solid var(--rule-strong); font-family: var(--serif); font-size: 1.1rem; }
.timeline .o { background: var(--paper-deep); border-color: var(--rule); }
.timeline small { display: block; font-family: var(--sans); font-size: .74rem; color: var(--muted); }
.timeline .act { font-size: .8rem; color: var(--ai); white-space: nowrap; }
.timeline .down { color: var(--rule-strong); font-size: 1rem; }

.parts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .8rem;
  margin: 1.2rem 0;
}
.parts > div { padding: .8rem 1rem; border-top: 2px solid var(--ai); }
.parts b { margin-right: .6rem; font-family: var(--serif); font-size: 1.3rem; font-weight: 500; }
.parts p { margin: .2rem 0 0; font-size: .9rem; }
.parts span { display: block; margin-top: .15rem; font-family: var(--serif); color: var(--muted); }

.values {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 1.2rem 0;
}
.values > div { padding: 1rem 1.1rem; border: 1px solid var(--rule-strong); }
.values span { font-size: .78rem; letter-spacing: .1em; color: var(--muted); }
.values h3 { margin: .2rem 0 .5rem; font-family: var(--serif); font-size: 1.15rem; }
.values p { margin: 0 0 .5rem; font-size: .92rem; }
.values p:last-child { margin-bottom: 0; }

details.deriv { margin: 1rem 0; border: 1px solid var(--rule); }
details.deriv summary { padding: .7rem 1rem; cursor: pointer; color: var(--ai); font-weight: 600; font-size: .95rem; }
details.deriv > div { padding: 0 1rem 1rem; }
details.deriv .eq { margin: .8rem 0; }

.prefs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
  align-items: start;
  margin: 1.2rem 0;
}
.bars > div {
  display: grid;
  grid-template-columns: 6.5em minmax(0, 1fr) auto;
  align-items: baseline; /* 項目名と数値は文字の底で、棒は中央でそろえる */
  gap: .6rem;
  margin: .4rem 0;
  font-size: .9rem;
}
.bars i { display: block; align-self: center; height: .8rem; width: var(--w); background: var(--ai); }
.bars em { font-style: normal; font-family: var(--serif); font-variant-numeric: tabular-nums; }
.prefs h3 { margin: 0 0 .3rem; font-family: var(--serif); font-size: 1.05rem; }
.prefs p { margin: 0; font-size: .92rem; color: var(--ink-soft); }

.maze {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: .4rem;
  max-width: 22rem;
  margin: 1.2rem auto;
  text-align: center;
  font-size: .9rem;
}
.maze > div { padding: .6rem .4rem; border: 1px solid var(--rule-strong); }
.maze .start { background: var(--paper-deep); }
.maze .stem { grid-column: 1 / -1; justify-self: center; width: 1.6rem; height: 1.4rem; padding: 0; border: 0; border-left: 1px dashed var(--rule-strong); border-right: 1px dashed var(--rule-strong); }
.maze .cue { grid-column: 1 / -1; justify-self: center; min-width: 9.5rem; border-color: var(--ai); color: var(--ai); }
.maze small { display: block; color: var(--muted); font-size: .75rem; }
.maze .cue small { color: var(--ai); }

.policies {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: .8rem;
  margin: 1.2rem 0;
}
.policies > div { padding: .8rem .9rem; border: 1px solid var(--rule); }
.policies > .best { border: 2px solid var(--ai); padding: calc(.8rem - 1px) calc(.9rem - 1px); } /* 太い枠のぶん中身が下がらないように */
.policies span { font-size: .78rem; letter-spacing: .1em; color: var(--muted); }
.policies strong { display: block; margin: .2rem 0 .3rem; font-family: var(--serif); font-size: 1.02rem; }
.policies p { margin: 0; font-size: .88rem; color: var(--ink-soft); }

.takeaway {
  margin-top: 2.6rem;
  padding: 1.2rem 1.3rem;
  border: 1px solid var(--ai);
}
.takeaway h2 { margin-bottom: .6rem; font-size: 1.2rem; letter-spacing: .08em; }
.takeaway ol { margin: 0; padding-left: 1.4em; }
.takeaway li + li { margin-top: .3em; }

/* ---------- 計算機 ---------- */

.calc {
  margin: 1.2rem 0;
  padding: 1.2rem 1.3rem;
  border: 1px solid var(--rule-strong);
}
.calc label {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: .1rem 1rem;
  align-items: center;
  margin-bottom: .9rem;
}
.calc label > span { font-size: .95rem; }
.calc output { font-family: var(--serif); font-size: 1.05rem; font-variant-numeric: tabular-nums; color: var(--ai); }
.calc input[type="range"] { grid-column: 1 / -1; width: 100%; margin: 0; accent-color: var(--ai); }
.calc .fixed { margin: .2rem 0 1rem; font-size: .88rem; color: var(--muted); }
.calc .results { display: grid; grid-template-columns: repeat(4, 1fr); gap: .6rem; }
.calc .results > div { padding: .6rem .7rem; background: var(--paper-deep); }
.calc .results span { display: block; font-size: .78rem; color: var(--muted); }
.calc .results strong { font-family: var(--serif); font-size: 1.2rem; font-weight: 500; font-variant-numeric: tabular-nums; }
.calc .results .featured { background: var(--ai); color: var(--paper); }
.calc .results .featured span { color: rgba(255, 255, 255, .78); }
.calc .obs { margin: .9rem 0 0; font-size: .92rem; color: var(--ink-soft); }
.caption { margin: .5rem 0 0; font-size: .85rem; color: var(--muted); }

/* ---------- 付録トップ ---------- */

.entries { display: grid; gap: 1rem; margin: 1.2rem 0; }
.entry { padding: 1.1rem 1.2rem; border: 1px solid var(--rule-strong); }
.entry .kicker { margin-bottom: .3rem; }
.entry h3 { margin: 0 0 .4rem; font-size: 1.25rem; letter-spacing: .04em; }
.entry h3 a { color: var(--ink); text-decoration: none; }
.entry h3 a:hover { color: var(--ai); }
.entry p { margin: 0 0 .6rem; font-size: .95rem; }
.entry .tags { display: flex; flex-wrap: wrap; gap: .3rem .8rem; margin: 0 0 .7rem; padding: 0; list-style: none; font-size: .82rem; color: var(--muted); }
.entry .tags li::before { content: "・"; color: var(--rule-strong); }

.table-wrap { margin: 1.2rem 0; overflow-x: auto; }
.notation { width: 100%; border-collapse: collapse; font-size: .92rem; }
.notation th, .notation td { padding: .55rem .6rem; border-top: 1px solid var(--rule); text-align: left; vertical-align: top; }
.notation th { color: var(--muted); font-size: .8rem; font-weight: 600; letter-spacing: .06em; white-space: nowrap; }
.notation td { overflow-wrap: normal; word-break: keep-all; } /* 文節（<wbr>）で折り、式や閉じ括弧の手前では折らない */
.notation tr:last-child td { border-bottom: 1px solid var(--rule); }
.notation td:first-child { white-space: nowrap; }
.notation .f { white-space: nowrap; } /* 式は途中で折らない */

.pager {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-end; /* 右の「付録トップへ」を左の題名の行にそろえる */
  gap: .6rem 1.5rem;
  margin-top: 3rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--rule-strong);
}
.pager span { display: block; font-size: .78rem; letter-spacing: .1em; color: var(--muted); }

/* ---------- 小さな画面 ---------- */

@media (max-width: 640px) {
  .contents ol { columns: 1; }
  .notation td:first-child { white-space: normal; } /* 狭い画面では式の列に幅を譲る */
  .symbols, .pair, .compare, .map2, .parts, .values, .prefs { grid-template-columns: 1fr; }
  .policies { grid-template-columns: 1fr; }
  .calc .results { grid-template-columns: 1fr 1fr; }
  .bound { grid-template-columns: 1fr; gap: .4rem; }
  .eq { font-size: 1rem; padding: .8rem .9rem; }
  .timeline { gap: .4rem .3rem; }
  .timeline .s, .timeline .o { font-size: 1rem; padding: .5rem .2rem; }
}