/* くらしの計算帳 — shared look for every tool on af-tools.pages.dev (served at /_site/site.css).
   Direction: a paper notebook / meter-reading slip. Thin rules instead of boxes, one accent color per tool,
   numbers set like a receipt. Tools add their own small style.css on top and may override --accent. */

:root {
  --paper: #f6f2e9;
  --sheet: #fffdf8;
  --ink: #1f1d1a;
  --sub: #6b655c;
  --rule: #d9d0c1;
  --rule-strong: #b9ad99;
  --accent: #1f5f4a;        /* deep ledger green; tools may override */
  --accent-soft: #e5efe9;
  --warn: #9a3412;
  --font: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", system-ui, sans-serif;
  --num: "SF Mono", ui-monospace, "Menlo", "Consolas", monospace;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; color: var(--ink); background: var(--paper);
  font: 16px/1.8 var(--font); font-feature-settings: "palt"; letter-spacing: .01em;
}
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
img { max-width: 100%; }

/* ---- page frame ---- */
.site-head, .site-main, .site-foot { max-width: 980px; margin: 0 auto; padding: 0 20px; }
.site-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 14px; padding-top: 18px; padding-bottom: 10px; border-bottom: 2px solid var(--ink); }
.brand { font-weight: 800; font-size: 1rem; color: var(--ink); text-decoration: none; letter-spacing: .08em; }
.brand::before { content: "■"; color: var(--accent); margin-right: .35em; font-size: .8em; }
.crumbs { font-size: .82rem; color: var(--sub); }
.crumbs a { color: var(--sub); }
.site-main { padding-top: 22px; padding-bottom: 48px; }
.site-foot { border-top: 1px solid var(--rule-strong); padding-top: 14px; padding-bottom: 40px; font-size: .8rem; color: var(--sub); }
.site-foot p { margin: .3em 0; }

/* ---- type ---- */
h1 { font-size: clamp(1.5rem, 1.2rem + 1.4vw, 2.1rem); line-height: 1.35; margin: .2em 0 .4em; letter-spacing: .02em; }
h2 { font-size: 1.15rem; margin: 2.2em 0 .6em; padding-bottom: .25em; border-bottom: 1px solid var(--rule); }
h3 { font-size: 1rem; margin: 1.6em 0 .4em; }
.lead { font-size: 1.02rem; color: var(--ink); max-width: 46em; }
.lead strong, .eg { font-family: var(--num); font-weight: 700; color: var(--accent); }
.small, .note { font-size: .84rem; color: var(--sub); }

/* ---- calculator layout: inputs | slip ---- */
.calc { display: grid; gap: 28px; align-items: start; margin-top: 18px; }
@media (min-width: 820px) { .calc { grid-template-columns: minmax(0, 1fr) 360px; } .slip { position: sticky; top: 16px; } }

.fieldset { border: 0; border-top: 1px solid var(--rule-strong); margin: 0; padding: 12px 0 4px; }
.fieldset > legend { font-size: .78rem; font-weight: 700; color: var(--sub); letter-spacing: .12em; padding: 0 .4em 0 0; }
.row { display: flex; flex-wrap: wrap; gap: 10px 18px; }
label { display: block; font-size: .88rem; }
label > input, label > select { display: block; margin-top: 4px; }
input, select, button { font: inherit; }
input[type=number], input[type=text], select {
  width: 100%; min-width: 7em; padding: 7px 9px; color: var(--ink); background: var(--sheet);
  border: 1px solid var(--rule-strong); border-radius: 3px;
}
input[type=number] { font-family: var(--num); text-align: right; }
input:focus, select:focus, button:focus-visible { outline: 3px solid var(--accent-soft); outline-offset: 1px; border-color: var(--accent); }
.btn { padding: 7px 14px; background: var(--ink); color: var(--paper); border: 0; border-radius: 3px; cursor: pointer; }
.btn:hover { background: var(--accent); }
.btn-quiet { padding: 3px 8px; background: none; color: var(--sub); border: 1px solid var(--rule-strong); border-radius: 3px; cursor: pointer; font-size: .8rem; }

/* ---- the slip (meter-reading / receipt) ---- */
.slip { background: var(--sheet); border: 1px solid var(--rule-strong); border-top: 6px solid var(--accent); padding: 16px 18px 14px; box-shadow: 0 1px 0 var(--rule); }
.slip-title { font-size: .78rem; letter-spacing: .14em; color: var(--sub); margin: 0; }
.slip-amount { font-family: var(--num); font-size: 2.3rem; font-weight: 700; line-height: 1.2; margin: .15em 0 .1em; color: var(--ink); }
.slip-amount small { font-size: .9rem; font-weight: 400; color: var(--sub); margin-left: .3em; }
.slip-sub { font-size: .8rem; color: var(--sub); margin: 0 0 .6em; }
.leaders { list-style: none; margin: 10px 0 0; padding: 10px 0 0; border-top: 1px dashed var(--rule-strong); font-size: .9rem; }
.leaders li { display: flex; align-items: baseline; gap: 6px; margin: 3px 0; }
.leaders li::after { content: none; }
.leaders .k { white-space: nowrap; }
.leaders .dots { flex: 1; border-bottom: 1px dotted var(--rule-strong); transform: translateY(-4px); }
.leaders .v { font-family: var(--num); white-space: nowrap; }

/* ---- tables ---- */
.table-wrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: .9rem; }
th, td { padding: 6px 8px; border-bottom: 1px solid var(--rule); text-align: right; white-space: nowrap; font-family: var(--num); }
th:first-child, td:first-child { text-align: left; font-family: var(--font); white-space: normal; }
thead th { font-family: var(--font); font-size: .78rem; color: var(--sub); font-weight: 700; border-bottom: 1px solid var(--rule-strong); }

/* ---- reading pages ---- */
.prose { max-width: 44em; }
.prose p { margin: .7em 0; }
.qa dt { font-weight: 700; margin-top: 1.4em; }
.qa dt::before { content: "Q. "; color: var(--accent); font-family: var(--num); }
.qa dd { margin: .3em 0 0; }
.qa dd::before { content: "A. "; color: var(--sub); font-family: var(--num); }
.formula { font-family: var(--num); background: var(--sheet); border-left: 3px solid var(--accent); padding: 8px 12px; overflow-x: auto; }

/* ---- monetization slot (PR) ---- */
.pr-box { margin: 26px 0; padding: 10px 14px; background: var(--sheet); border: 1px solid var(--rule-strong); font-size: .92rem; }
.pr-label { display: inline-block; font-size: .7rem; font-weight: 700; letter-spacing: .1em; color: var(--sub); border: 1px solid var(--sub); border-radius: 2px; padding: 0 5px; margin-right: 8px; }

/* ---- hub index ---- */
.toc { list-style: none; margin: 0; padding: 0; counter-reset: toc; }
.toc li { counter-increment: toc; display: grid; grid-template-columns: 3em 1fr; gap: 2px 10px; padding: 14px 0; border-bottom: 1px solid var(--rule); }
.toc li::before { content: counter(toc, decimal-leading-zero); font-family: var(--num); color: var(--accent); font-weight: 700; grid-row: span 2; padding-top: 2px; }
.toc a { font-weight: 700; font-size: 1.05rem; text-decoration: none; color: var(--ink); }
.toc a:hover { color: var(--accent); text-decoration: underline; }
.toc p { margin: 0; font-size: .88rem; color: var(--sub); }

@media print { .site-head nav, .btn, .btn-quiet, .pr-box { display: none; } body { background: #fff; } }