:root {
  --ink: #1f2a30;
  --muted: #55636b;
  --line: #cfd8dc;
  --bg: #ffffff;
  --soft: #f3f6f7;
  --brand: #37474f;
  --accent: #b5651d;
  --yes: #1b6e3c;
  --yes-bg: #e4f3e9;
  --no: #a32a22;
  --no-bg: #fbe9e7;
  --warn: #7a4f00;
  --warn-bg: #fff3d6;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Meiryo", sans-serif;
  font-size: 17px;
  line-height: 1.8;
}

a { color: #0b5a8a; }

.wrap { max-width: 1040px; margin: 0 auto; padding: 0 16px; }
.narrow { max-width: 720px; }

.site-header { border-bottom: 3px solid var(--brand); }
.site-header .wrap { display: flex; flex-wrap: wrap; gap: 4px 20px; align-items: center; justify-content: space-between; padding-top: 10px; padding-bottom: 10px; }
.site-name { font-weight: 700; color: var(--brand); text-decoration: none; }
.site-nav { display: flex; flex-wrap: wrap; gap: 2px 16px; font-size: 15px; }

main { padding: 24px 0 40px; }

h1 { font-size: 1.55rem; line-height: 1.45; margin: 0 0 12px; }
h2 { font-size: 1.25rem; line-height: 1.5; margin: 40px 0 10px; padding-bottom: 4px; border-bottom: 1px solid var(--line); }
h3 { font-size: 1.05rem; line-height: 1.5; margin: 24px 0 6px; }
p { margin: 0 0 12px; }
ul, ol { padding-left: 1.4em; margin: 0 0 12px; }

.notice {
  border-left: 5px solid var(--accent);
  background: #fdf5ec;
  padding: 10px 14px;
  margin: 0 0 12px;
  font-weight: 700;
}
.privacy { color: var(--muted); font-size: 15px; }

/* 計算 */
.calc { display: grid; gap: 20px; margin-top: 16px; }
@media (min-width: 880px) {
  .calc { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: start; }
  .calc-output { position: sticky; top: 12px; max-height: calc(100vh - 24px); overflow-y: auto; }
}
fieldset { border: 1px solid var(--line); border-radius: 6px; margin: 0 0 14px; padding: 8px 14px 14px; min-width: 0; }
legend { font-weight: 700; padding: 0 6px; color: var(--brand); }
.field { margin-top: 10px; }
.field label, .field .label { display: block; font-size: 15px; font-weight: 700; }
.hint { display: block; font-size: 14px; color: var(--muted); line-height: 1.5; }
.lead-hint { margin: 0 0 12px; font-size: 15px; line-height: 1.6; font-weight: 700; }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
input[type="text"], select {
  width: 100%;
  min-height: 44px;
  padding: 6px 8px;
  border: 1px solid #90a4ae;
  border-radius: 4px;
  background: #fff;
  color: var(--ink);
  font: inherit;
  font-size: 16px;
}
input:focus-visible, select:focus-visible, button:focus-visible, a:focus-visible { outline: 3px solid #4d90c4; outline-offset: 1px; }
.fraction { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.fraction input { width: 5.5em; }
.buttons { display: flex; flex-wrap: wrap; gap: 10px; }
button {
  min-height: 44px;
  padding: 6px 14px;
  border: 1px solid var(--brand);
  border-radius: 4px;
  background: #fff;
  color: var(--brand);
  font: inherit;
  font-size: 15px;
  cursor: pointer;
}
[hidden] { display: none !important; }
input[aria-invalid="true"] { border: 2px solid var(--no); background: var(--no-bg); }
.sr-only { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
.calc-output:focus-visible { outline: 3px solid #4d90c4; outline-offset: 1px; }

.calc-output { border: 2px solid var(--brand); border-radius: 6px; padding: 4px 14px 12px; background: var(--soft); }
.calc-output > h2 { margin: 8px 0 0; border: 0; font-size: 1.1rem; }
.result-block { padding: 10px 0; border-bottom: 1px solid var(--line); }
.result-block h3 { margin: 0; }
.result-block h4 { margin: 10px 0 2px; font-size: 14px; color: var(--muted); }
.result-head { display: flex; flex-wrap: wrap; gap: 6px 10px; align-items: center; justify-content: space-between; }
.badge { display: inline-block; padding: 2px 10px; border-radius: 4px; font-weight: 700; font-size: 15px; background: #e3e8ea; color: var(--brand); }
.badge-yes { background: var(--yes-bg); color: var(--yes); border: 1px solid var(--yes); }
.badge-no { background: var(--no-bg); color: var(--no); border: 1px solid var(--no); }
.badge-warn { background: var(--warn-bg); color: var(--warn); border: 1px solid var(--warn); }
.metrics { display: flex; flex-wrap: wrap; gap: 8px 24px; margin: 8px 0; }
.metric-label { display: block; font-size: 13px; color: var(--muted); }
.metric-value { display: block; font-size: 1.6rem; font-weight: 700; line-height: 1.3; }
.basis { font-size: 15px; line-height: 1.6; margin: 6px 0; }
.steps { font-size: 15px; line-height: 1.6; margin: 0; }
.cautions { margin: 8px 0 0; padding: 6px 10px 6px 1.6em; background: var(--warn-bg); color: var(--warn); font-size: 15px; line-height: 1.6; border-radius: 4px; }
.result-note { font-size: 14px; color: var(--muted); margin: 10px 0 0; }

/* 表 */
.table-scroll { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: 15px; line-height: 1.6; margin: 0 0 12px; }
th, td { border: 1px solid var(--line); padding: 6px 8px; text-align: left; vertical-align: top; }
thead th { background: var(--soft); }
.num { text-align: right; white-space: nowrap; font-variant-numeric: tabular-nums; }
th.num { white-space: normal; }
table.compact { margin: 8px 0 0; background: #fff; }

/* カード */
.cards { display: grid; gap: 14px; margin: 18px 0; }
@media (min-width: 680px) { .cards { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.card { border: 1px solid var(--line); border-radius: 6px; padding: 14px 16px; }
.card h2, .card h3 { margin: 0 0 6px; border: 0; padding: 0; font-size: 1.1rem; }
.card p:last-child { margin-bottom: 0; }

.download { display: inline-block; min-height: 44px; padding: 8px 14px; border-radius: 4px; background: var(--brand); color: #fff; font-weight: 700; text-decoration: none; }

.kit-guide { margin-top: 44px; border-top: 1px solid var(--line); padding-top: 12px; font-size: 15px; color: var(--muted); }
.kit-guide h2 { font-size: 1rem; margin: 0 0 4px; border: 0; padding: 0; color: var(--ink); }

.site-footer { border-top: 1px solid var(--line); background: var(--soft); font-size: 14px; color: var(--muted); padding: 16px 0 24px; }
.site-footer p { margin: 0 0 6px; }