:root {
  --bg: #fffaf5;
  --fg: #2b2320;
  --muted: #6d625c;
  --line: #eadfd6;
  --accent: #b3262e;
  --accent-bg: #fdecea;
  --card: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1816;
    --fg: #f1e9e3;
    --muted: #b3a79f;
    --line: #3a322e;
    --accent: #ff8d8f;
    --accent-bg: #3a2220;
    --card: #26201d;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.8 "Hiragino Sans", "Yu Gothic UI", "Meiryo", system-ui, sans-serif;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 0 16px; }
a { color: var(--accent); }
h1 { font-size: 1.55rem; line-height: 1.4; margin: 1.2rem 0 .6rem; }
h2 { font-size: 1.25rem; margin: 2.2rem 0 .6rem; padding-left: .6rem; border-left: 4px solid var(--accent); }
h3 { font-size: 1.05rem; margin: 1.4rem 0 .4rem; }
.lead { font-size: 1.05rem; }
.updated, .small { color: var(--muted); font-size: .85rem; }
.note { color: var(--muted); font-size: .92rem; }

.site-header { border-bottom: 1px solid var(--line); background: var(--card); }
.brand { display: block; padding: .7rem 0; text-decoration: none; color: var(--accent); font-weight: 700; font-size: 1.3rem; }
.brand span { margin-left: .8rem; font-size: .8rem; font-weight: 400; color: var(--muted); }
.site-footer { margin-top: 3rem; padding: 1.5rem 0 2.5rem; border-top: 1px solid var(--line); color: var(--muted); font-size: .88rem; }
.crumbs { font-size: .85rem; color: var(--muted); margin-top: .8rem; }

.tool { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 1rem; margin: 1.2rem 0; }
.grid { display: grid; gap: .8rem; grid-template-columns: 1fr; }
@media (min-width: 560px) { .grid { grid-template-columns: 1fr 1fr; } }
label { display: block; font-size: .85rem; color: var(--muted); }
select {
  display: block; width: 100%; margin-top: .25rem; padding: .6rem .5rem; font-size: 1rem;
  border: 1px solid var(--line); border-radius: 8px; background: var(--bg); color: var(--fg);
}
.result { margin-top: 1rem; }
.amount { background: var(--accent-bg); border-radius: 10px; padding: .9rem 1rem; text-align: center; }
.amount small { display: block; color: var(--muted); }
.amount strong { display: block; font-size: 2.2rem; line-height: 1.3; color: var(--accent); }
.amount span { color: var(--muted); font-size: .9rem; }
.region-box { border: 1px solid var(--line); border-left: 4px solid var(--accent); border-radius: 8px; padding: .2rem 1rem .8rem; margin: 1rem 0; background: var(--card); }
.tips ul { padding-left: 1.2rem; }

.tbl { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; background: var(--card); font-size: .95rem; }
th, td { border: 1px solid var(--line); padding: .5rem .6rem; text-align: right; white-space: nowrap; }
th:first-child, thead th { text-align: left; background: var(--accent-bg); }
tbody th { font-weight: 600; white-space: normal; }

.dl dt { font-weight: 700; margin-top: .8rem; }
.dl dd { margin: .1rem 0 0; }
details { border: 1px solid var(--line); border-radius: 8px; background: var(--card); margin: .5rem 0; padding: .1rem .8rem; }
summary { cursor: pointer; font-weight: 600; padding: .5rem 0; }

.chips, .cards { list-style: none; padding: 0; margin: .5rem 0; display: flex; flex-wrap: wrap; gap: .5rem; }
.chips a { display: inline-block; padding: .35rem .8rem; border: 1px solid var(--line); border-radius: 999px; text-decoration: none; background: var(--card); }
.chips a[aria-current] { background: var(--accent); color: #fff; border-color: var(--accent); }
.cards li { flex: 1 1 calc(50% - .5rem); }
.card { display: block; height: 100%; padding: .8rem; border: 1px solid var(--line); border-radius: 10px; background: var(--card); text-decoration: none; color: var(--fg); }
.card b { display: block; color: var(--accent); }
.card span { font-size: .85rem; color: var(--muted); }
.btn { display: inline-block; margin-top: .6rem; padding: .6rem 1.1rem; border-radius: 8px; background: var(--accent); color: #fff; text-decoration: none; }

.foot-h { font-size: 1rem; border: 0; padding: 0; margin: 0 0 .4rem; color: var(--fg); }
.foot-tools { list-style: none; padding: 0; margin: 0 0 1rem; }
.foot-tools li { margin: .25rem 0; }
.foot-tools span { margin-left: .6rem; font-size: .82rem; }