/* かいまわり計算機 — 白地・黒の太い数字・アクセント1色（深緑）・罫線ベース */
:root {
  --bg: #ffffff;
  --ink: #111111;
  --ink-2: #3d3d3d;
  --muted: #666666;
  --rule: #dcdcdc;
  --rule-strong: #111111;
  --accent: #0b6e4f;
  --accent-ink: #ffffff;
  --accent-tint: #edf5f1;
  --warn: #8a4b00;
  --warn-tint: #fff6e8;
  --focus: #0b6e4f;
  --font: system-ui, -apple-system, "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", "Meiryo", sans-serif;
  --num: "Noto Sans JP", system-ui, -apple-system, sans-serif;
  --gutter: 16px;
  --maxw: 760px;
  color-scheme: light;
}

*,
*::before,
*::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
}

img { max-width: 100%; height: auto; }

a { color: var(--accent); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }

:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter); }

/* ---------- header / footer ---------- */
.site-header { border-bottom: 2px solid var(--rule-strong); background: var(--bg); }
.site-header .wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; min-height: 52px; flex-wrap: wrap;
}
.brand {
  color: var(--ink); text-decoration: none; font-weight: 900; font-size: 18px; letter-spacing: .02em;
  display: inline-flex; align-items: center; gap: 8px;
}
.brand-mark {
  display: inline-block; width: 14px; height: 14px; background: var(--accent);
}
.site-nav { display: flex; gap: 16px; font-size: 14px; flex-wrap: wrap; }
.site-nav a { color: var(--ink); text-decoration: none; border-bottom: 2px solid transparent; padding: 2px 0; }
.site-nav a[aria-current="page"], .site-nav a:hover { border-bottom-color: var(--accent); }

.site-footer { border-top: 2px solid var(--rule-strong); margin-top: 48px; padding: 20px 0 32px; font-size: 13px; color: var(--ink-2); }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 6px 18px; margin-bottom: 10px; }
.site-footer a { color: var(--ink); }
.site-footer p { margin: 4px 0; }

/* ---------- headings / text ---------- */
h1 { font-size: 20px; line-height: 1.4; margin: 18px 0 6px; font-weight: 900; }
h2 { font-size: 18px; line-height: 1.45; margin: 32px 0 10px; padding-top: 12px; border-top: 1px solid var(--rule-strong); font-weight: 800; }
h3 { font-size: 16px; margin: 20px 0 6px; font-weight: 800; }
p { margin: 8px 0; }
.lead { color: var(--ink-2); font-size: 14px; margin: 0 0 12px; }
.small { font-size: 13px; color: var(--muted); }
.num { font-family: var(--num); font-variant-numeric: tabular-nums; }

/* ---------- result panel (sticky) ---------- */
.result {
  position: sticky; top: 0; z-index: 20;
  background: var(--bg);
  border-top: 3px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule-strong);
  margin: 0 calc(var(--gutter) * -1);
  padding: 8px var(--gutter) 10px;
}
.result-grid {
  display: grid; grid-template-columns: minmax(0, .85fr) minmax(0, .85fr) minmax(0, 1.3fr);
  border-bottom: 1px solid var(--rule);
}
.metric { padding: 2px 8px 6px; border-left: 1px solid var(--rule); min-width: 0; }
.metric:first-child { border-left: 0; padding-left: 0; }
.metric-label { display: block; font-size: 11px; color: var(--muted); letter-spacing: .04em; white-space: nowrap; }
.metric-value {
  display: block; font-family: var(--num); font-weight: 900; font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 8.4vw, 44px); line-height: 1.1; letter-spacing: -.01em;
  overflow-wrap: anywhere;
}
.metric-value small { font-size: .42em; font-weight: 700; margin-left: 2px; letter-spacing: 0; }
.metric.is-accent .metric-value { color: var(--accent); }

.next-line {
  margin: 8px 0 0; font-size: 15px; line-height: 1.5; font-weight: 700;
  display: flex; flex-wrap: wrap; gap: 2px 10px; align-items: baseline;
}
.next-line strong { font-family: var(--num); font-size: 22px; font-weight: 900; color: var(--accent); font-variant-numeric: tabular-nums; }
.next-line .cost { font-weight: 500; color: var(--ink-2); font-size: 14px; }
.next-line .cost b { font-family: var(--num); font-weight: 800; color: var(--ink); }
.sub-line { margin: 2px 0 0; font-size: 12.5px; color: var(--ink-2); line-height: 1.5; }

/* ---------- period banner ---------- */
.period-banner { margin: 0 0 10px; font-size: 13px; color: var(--ink-2); min-height: 1em; }
.period-banner a { font-weight: 700; }
.period-banner:empty { margin: 0; }

/* ---------- share row ---------- */
.share-row { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 10px; margin: 14px 0 0; }
.share-label { font-size: 13px; font-weight: 700; color: var(--ink-2); margin-right: 2px; }
.btn-share { font-size: 13px; padding: 7px 12px; }
.share-status { font-size: 12.5px; color: var(--accent); font-weight: 700; }

/* ---------- embed code (about page) ---------- */
.embed-code-block { display: grid; gap: 8px; margin: 10px 0 20px; }
.embed-code {
  width: 100%; min-height: 72px; resize: vertical;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 12.5px;
  padding: 10px; border: 1px solid var(--rule); background: #fafafa; color: var(--ink-2);
}

/* ---------- embed mode ---------- */
.embed-link { display: none; margin: 18px 0 0; font-size: 12.5px; text-align: center; }
html.is-embed .site-header,
html.is-embed .site-footer { display: none; }
html.is-embed .embed-link { display: block; }
html.is-embed .result { top: 0; }

/* ---------- tabs ---------- */
.tabs { display: flex; border-bottom: 1px solid var(--rule-strong); margin-top: 18px; }
.tab {
  appearance: none; background: none; border: 0; border-bottom: 3px solid transparent;
  padding: 10px 2px 8px; margin-right: 18px; font: inherit; font-size: 15px; font-weight: 700;
  color: var(--muted); cursor: pointer;
}
.tab[aria-selected="true"] { color: var(--ink); border-bottom-color: var(--accent); }

/* ---------- inputs ---------- */
.panel[hidden] { display: none; }
.shop-list { list-style: none; margin: 0; padding: 0; counter-reset: shop; }
.shop-row {
  display: grid; grid-template-columns: 4.6em minmax(0, 1fr) auto; align-items: center;
  gap: 8px; padding: 10px 0; border-bottom: 1px solid var(--rule);
}
.shop-row label { font-size: 13px; color: var(--ink-2); font-weight: 700; }
.shop-status { grid-column: 2 / 4; font-size: 12.5px; margin-top: -4px; color: var(--muted); }
.shop-status.ok { color: var(--accent); font-weight: 700; }
.shop-status.short { color: var(--warn); font-weight: 700; }

.yen-input { position: relative; display: flex; align-items: center; min-width: 0; }
.yen-input input { padding-right: 2.2em; }
.yen-input .unit { position: absolute; right: 10px; color: var(--muted); font-size: 14px; pointer-events: none; }

input[type="text"], input[type="number"], select {
  width: 100%; min-width: 0; font: inherit; font-size: 16px; /* iOS のズーム防止 */
  font-family: var(--num); font-variant-numeric: tabular-nums;
  padding: 9px 10px; border: 1px solid #9a9a9a; border-radius: 2px; background: #fff; color: var(--ink);
}
input:focus, select:focus { border-color: var(--accent); outline: 2px solid var(--accent); outline-offset: 0; }

.btn {
  appearance: none; font: inherit; font-size: 14px; font-weight: 700; cursor: pointer;
  padding: 9px 14px; border: 1px solid var(--rule-strong); background: #fff; color: var(--ink);
  border-radius: 2px; line-height: 1.3; text-decoration: none; display: inline-block;
}
.btn:hover { background: var(--accent-tint); }
.btn-primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn-primary:hover { background: #095c42; }
.btn-del { padding: 8px 10px; font-size: 13px; font-weight: 500; border-color: #9a9a9a; color: var(--ink-2); }
.row-actions { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0 4px; }

.field { display: grid; gap: 4px; margin: 12px 0; }
.field label { font-size: 14px; font-weight: 700; }
.field .hint { font-size: 12.5px; color: var(--muted); }
.check { display: flex; gap: 10px; align-items: flex-start; margin: 12px 0; font-size: 14px; }
.check input { width: 20px; height: 20px; margin: 2px 0 0; accent-color: var(--accent); flex: none; }

details.params { border-top: 1px solid var(--rule-strong); border-bottom: 1px solid var(--rule-strong); margin: 24px 0 0; }
details.params > summary {
  cursor: pointer; padding: 12px 0; font-weight: 800; list-style: none; display: flex; justify-content: space-between; gap: 8px;
}
details.params > summary::-webkit-details-marker { display: none; }
details.params > summary::after { content: "＋"; font-weight: 700; }
details.params[open] > summary::after { content: "－"; }
details.params .params-body { padding: 0 0 14px; }
.param-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 14px; }
@media (max-width: 420px) { .param-grid { grid-template-columns: minmax(0, 1fr); } }

.warn {
  border-left: 4px solid var(--warn); background: var(--warn-tint); padding: 8px 12px; font-size: 14px; margin: 10px 0;
}

/* ---------- tables ---------- */
.table-scroll { overflow-x: auto; }
table.rows { width: 100%; border-collapse: collapse; font-size: 14px; }
table.rows th, table.rows td { border-bottom: 1px solid var(--rule); padding: 8px 4px; text-align: left; vertical-align: top; }
table.rows td.n { text-align: right; font-family: var(--num); font-variant-numeric: tabular-nums; font-weight: 700; white-space: nowrap; }
table.rows tr.total th, table.rows tr.total td { border-top: 2px solid var(--rule-strong); border-bottom: 2px solid var(--rule-strong); font-weight: 900; }

/* ---------- notes / formula ---------- */
ul.notes { margin: 8px 0; padding-left: 1.2em; }
ul.notes li { margin: 6px 0; font-size: 14px; }
.formula {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 13px; line-height: 1.8;
  border: 1px solid var(--rule); padding: 10px 12px; background: #fafafa; overflow-x: auto; white-space: pre-wrap; overflow-wrap: anywhere;
}

.cta-block {
  border: 2px solid var(--rule-strong); padding: 14px 14px; margin: 28px 0 0;
  display: grid; gap: 8px;
}
.cta-block p { margin: 0; }
.cta-block .btn { justify-self: start; }

/* ---------- PR notice ---------- */
.pr-notice {
  border: 2px solid var(--rule-strong); padding: 10px 12px; margin: 12px 0; font-size: 14px; line-height: 1.6;
}
.pr-notice b { display: inline-block; background: var(--ink); color: #fff; padding: 0 6px; margin-right: 6px; font-size: 12px; letter-spacing: .08em; }
.note { border: 2px solid var(--rule-strong); padding: 10px 12px; margin: 12px 0; font-size: 14px; line-height: 1.6; }
.note .prbadge { display: inline-block; background: var(--ink); color: #fff; padding: 0 6px; margin-right: 6px; font-size: 12px; letter-spacing: .08em; }

/* ---------- item list ---------- */
.controls { display: grid; gap: 10px; margin: 12px 0; border-top: 1px solid var(--rule-strong); border-bottom: 1px solid var(--rule); padding: 10px 0; }
.seg { display: flex; flex-wrap: wrap; gap: 6px 14px; border: 0; padding: 0; margin: 0; }
.seg legend { font-size: 13px; color: var(--muted); padding: 0; margin-bottom: 4px; }
.seg label { display: inline-flex; gap: 6px; align-items: center; font-size: 14px; cursor: pointer; }
.seg input { accent-color: var(--accent); width: 18px; height: 18px; margin: 0; }
.sort-row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; font-size: 14px; }
.sort-row select { width: auto; max-width: 100%; }

.status { font-size: 14px; color: var(--ink-2); margin: 10px 0; }
.status.is-error { border-left: 4px solid var(--warn); background: var(--warn-tint); padding: 10px 12px; }

.items { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); border-top: 1px solid var(--rule); border-left: 1px solid var(--rule); }
.item { border-right: 1px solid var(--rule); border-bottom: 1px solid var(--rule); padding: 10px; display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.item-img { width: 100%; aspect-ratio: 1 / 1; object-fit: contain; background: #fff; display: block; }
.item-name {
  font-size: 13px; line-height: 1.5; margin: 0; overflow-wrap: anywhere;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}
.item-price { font-family: var(--num); font-weight: 900; font-size: 20px; line-height: 1.2; font-variant-numeric: tabular-nums; }
.item-price small { font-size: 12px; font-weight: 700; margin-left: 2px; }
.item-meta { font-size: 12px; color: var(--ink-2); line-height: 1.5; overflow-wrap: anywhere; }
.tag { display: inline-block; border: 1px solid var(--accent); color: var(--accent); font-size: 11px; font-weight: 700; padding: 0 5px; margin-right: 4px; }
.item .btn { margin-top: auto; text-align: center; font-size: 13px; padding: 8px 6px; }

.credit { margin: 18px 0 0; font-size: 13px; }

/* ---------- article ---------- */
.article p, .article li { font-size: 15.5px; }
.article ul, .article ol { padding-left: 1.3em; }
.article .meta { font-size: 13px; color: var(--muted); border-bottom: 1px solid var(--rule); padding-bottom: 10px; }
.sources { font-size: 13.5px; }
.sources li { margin: 6px 0; overflow-wrap: anywhere; }

.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

@media (min-width: 720px) {
  h1 { font-size: 24px; }
  .result { margin: 0; padding: 10px 0 12px; }
}

/* 低い画面（横向き・キーボード表示で縦が縮む端末）では固定パネルの補足行を省く */
@media (max-height: 560px) {
  .sub-line { display: none; }
  .metric-value { font-size: 26px; }
}

@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; } }