/* 寸法の計算サイト。見た目は「巻尺（メジャー）」の案（デザイン案/ の B）。廊下で片手でメジャーを持ちながら使う前提で、
   大きい入力・強いコントラスト・大きい判定の文字にする。図は「製図」の案（A）の線と方眼を借りる。 */
:root {
  --ink: #151515;
  --sub: #5c5c5c;
  --yellow: #ffc400;
  --yellow-soft: #fff4c7;
  --paper: #fffdf5;
  --card: #ffffff;
  --line: #151515;
  --line-soft: #e5dfcc;
  --ok: #0a7f4f;
  --ng: #c62d28;
  --warn: #b35c00;
  --blue: #2457c5;
  --radius: 14px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic UI", Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  overflow-wrap: anywhere;
}
a { color: var(--blue); }
h1 { font-size: 1.5rem; line-height: 1.4; margin: 0.5em 0 0.3em; }
h2 { font-size: 1.2rem; margin: 2em 0 0.6em; line-height: 1.4; padding: 2px 0 6px; border-bottom: 3px solid var(--ink); position: relative; }
h2::after { content: ""; position: absolute; left: 0; bottom: -9px; width: 100%; height: 6px; background: repeating-linear-gradient(90deg, var(--ink) 0 1px, transparent 1px 10px); }
h3 { font-size: 1.05rem; margin: 1.5em 0 0.3em; }

/* ヘッダー: 巻尺のテープ（目盛り） */
.site-header { background: var(--yellow); padding: 10px 16px 12px; position: relative; }
.site-header::after { content: ""; position: absolute; left: 0; right: 0; bottom: -8px; height: 8px;
  background: repeating-linear-gradient(90deg, var(--ink) 0 1px, transparent 1px 10px) 0 0 / 100% 5px no-repeat,
              repeating-linear-gradient(90deg, var(--ink) 0 2px, transparent 2px 50px) 0 0 / 100% 8px no-repeat, var(--yellow); }
.brand { display: flex; align-items: center; gap: 8px; color: var(--ink); text-decoration: none; max-width: 760px; margin: 0 auto; flex-wrap: wrap; }
.brand-mark { display: grid; place-items: center; width: 32px; height: 32px; border-radius: 50%; background: var(--ink); color: var(--yellow); font-weight: 900; }
.brand-name { font-weight: 900; font-size: 1.1rem; }
.brand-tag { font-size: 0.78rem; }
.crumbs { max-width: 760px; margin: 0 auto; padding: 16px 16px 0; font-size: 0.82rem; color: var(--sub); }
.crumbs a { color: var(--sub); }
.wrap { max-width: 760px; margin: 0 auto; padding: 4px 16px 48px; }

.lead { margin: 0 0 4px; }
.meta { font-size: 0.8rem; color: var(--sub); margin: 0 0 14px; }
.small { font-size: 0.85rem; color: var(--sub); }
.card { background: var(--card); border: 2px solid var(--line); border-radius: var(--radius); padding: 16px; margin: 16px 0; box-shadow: 0 3px 0 var(--ink); }

/* 入力 */
.field { display: block; border: 0; margin: 0 0 16px; padding: 0; min-width: 0; }
.field > span:first-child, .field legend, .lbl { display: block; font-weight: 800; margin-bottom: 6px; }
.field small, .hint { display: block; color: var(--sub); font-size: 0.82rem; margin-top: 4px; line-height: 1.5; }
.num { display: flex; align-items: center; gap: 6px; }
.dims { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 6px; }
.dims label { display: block; font-size: 0.78rem; font-weight: 700; color: var(--sub); }
input[type="number"], input[type="text"], select {
  width: 100%;
  min-height: 52px;
  font: inherit;
  font-size: 1.35rem;
  font-weight: 800;
  padding: 6px 10px;
  border: 2px solid var(--ink);
  border-radius: 10px;
  background: #fffbe6;
  color: var(--ink);
  -moz-appearance: textfield;
}
input[type="text"] { font-size: 1.05rem; font-weight: 700; }
select { font-size: 1.05rem; }
input:focus, select:focus { outline: 3px solid var(--blue); outline-offset: 1px; background: #fff; }
.unit { font-weight: 800; white-space: nowrap; }
.seg { display: flex; flex-wrap: wrap; gap: 6px; }
.seg label { position: relative; }
.seg input { position: absolute; opacity: 0; pointer-events: none; }
.seg span { display: inline-block; padding: 9px 14px; border: 2px solid var(--ink); border-radius: 999px; font-weight: 700; cursor: pointer; background: #fff; min-height: 44px; }
.seg input:checked + span { background: var(--ink); color: var(--yellow); }
.seg input:focus-visible + span { outline: 3px solid var(--blue); }
.btn { display: block; width: 100%; min-height: 56px; border: 0; border-radius: 12px; background: var(--ink); color: var(--yellow); font: inherit; font-size: 1.15rem; font-weight: 900; cursor: pointer; }
.btn-sub { display: inline-block; min-height: 44px; padding: 8px 14px; border: 2px solid var(--ink); border-radius: 10px; background: #fff; font: inherit; font-weight: 800; cursor: pointer; color: var(--ink); }
.btn-sub.small { min-height: 36px; padding: 4px 10px; font-size: 0.85rem; }
.btn-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0; }

/* 通り道の一覧 */
.spot { border: 2px dashed var(--ink); border-radius: 12px; padding: 12px; margin: 0 0 12px; background: var(--paper); }
.spot-head { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.spot-head select { min-height: 44px; font-size: 1rem; flex: 1; }
.spot-n { display: grid; place-items: center; min-width: 30px; height: 30px; border-radius: 50%; background: var(--ink); color: var(--yellow); font-weight: 900; }
.pair { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 6px; }
.pair label, .trio label { display: block; font-size: 0.78rem; font-weight: 700; color: var(--sub); }
.trio { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 6px; }
.trio select, .pair select { font-size: 0.92rem; padding: 4px 6px; }
.live { margin: 8px 0 0; padding: 8px 12px; border-radius: 10px; background: var(--ink); color: #fff; font-weight: 700; }
.live.ng { background: var(--ng); }
.live.warn { background: #6b4a00; }

/* 結果 */
.result { background: var(--ink); color: #fff; border-color: var(--ink); }
.result a { color: var(--yellow); }
.r-label { margin: 0; font-size: 0.8rem; letter-spacing: 0.2em; color: var(--yellow); }
.r-big { margin: 0; font-size: 3rem; line-height: 1.2; font-weight: 900; color: var(--yellow); }
.r-big.ng { color: #ff8a80; }
.r-big.tight { color: #ffd27a; }
.r-big small { font-size: 1rem; color: #fff; margin-left: 8px; font-weight: 700; }
.r-sub { margin: 4px 0 12px; }
.r-list { list-style: none; padding: 0; margin: 12px 0; }
.r-list li { background: #262626; border-radius: 10px; padding: 10px 12px; margin: 0 0 8px; border-left: 8px solid var(--yellow); }
.r-list li.ng { border-left-color: #ff8a80; }
.r-list li.tight { border-left-color: #ffd27a; }
.r-list li.warn { border-left-color: #ffd27a; }
.r-list b { display: block; }
.r-list .why { display: block; font-size: 0.88rem; color: #ddd; }
.joke { font-size: 0.85rem; color: #cfcfcf; border-top: 1px dashed #555; padding-top: 8px; margin-top: 12px; }
.fig { background: var(--paper); border-radius: 10px; padding: 6px; margin: 10px 0; }
.fig svg, .fig img { display: block; width: 100%; height: auto; }
.fig-cap { font-size: 0.82rem; color: var(--sub); margin: 4px 0 0; }
.result .fig-cap { color: #ccc; }

/* 配置の図 */
.board { position: relative; background: #fff; border: 2px solid var(--ink); border-radius: 12px; padding: 6px; touch-action: none; }
.board svg { display: block; width: 100%; height: auto; max-height: 70vh; }
.board .it { cursor: grab; }
.tabs { display: flex; gap: 6px; margin: 0 0 8px; }
.tabs button { flex: 1; min-height: 44px; border: 2px solid var(--ink); border-radius: 10px; background: #fff; font: inherit; font-weight: 800; color: var(--ink); cursor: pointer; }
.tabs button[aria-pressed="true"] { background: var(--ink); color: var(--yellow); }
.items-list { list-style: none; padding: 0; margin: 0; }
.items-list li { border: 2px solid var(--line-soft); border-radius: 12px; padding: 10px; margin: 0 0 10px; background: #fff; }
.items-list li.sel { border-color: var(--blue); }
.items-list .row { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.items-list input[type="number"] { min-height: 44px; font-size: 1.1rem; }
.badge { display: inline-block; font-size: 0.75rem; font-weight: 800; padding: 1px 8px; border-radius: 999px; background: var(--yellow); color: var(--ink); }
.badge.ng { background: var(--ng); color: #fff; }
.badge.warn { background: #ffd27a; }
details.more { border: 2px solid var(--line-soft); border-radius: 12px; padding: 8px 12px; margin: 10px 0; background: #fff; }
details.more summary { font-weight: 800; cursor: pointer; min-height: 36px; }

/* 測る順のチェック */
.measure { counter-reset: m; list-style: none; padding: 0; }
.measure li { counter-increment: m; position: relative; padding: 8px 8px 8px 44px; border-bottom: 1px dashed var(--line-soft); }
.measure li::before { content: counter(m); position: absolute; left: 4px; top: 8px; width: 28px; height: 28px; border-radius: 50%; background: var(--yellow); display: grid; place-items: center; font-weight: 900; }

/* 次の1本 */
.next { margin: 16px 0 4px; }
.next-label { font-size: 0.8rem; color: var(--yellow); letter-spacing: 0.15em; margin: 0 0 6px; }
.next a.next-card { display: block; background: var(--yellow); color: var(--ink); text-decoration: none; border-radius: 12px; padding: 12px 14px; margin: 0 0 8px; font-weight: 800; }
.next a.next-card span { display: block; font-weight: 400; font-size: 0.88rem; }
.wrap > .next .next-label { color: var(--sub); }
.share { margin-top: 14px; display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.share-label { width: 100%; margin: 0; font-size: 0.8rem; color: #ccc; }
.btn-share { display: inline-block; min-height: 40px; padding: 7px 12px; border-radius: 999px; border: 1px solid #666; background: #222; color: #fff; text-decoration: none; font: inherit; font-size: 0.88rem; cursor: pointer; }
.result .btn-share { color: #fff; }

/* 本文 */
.explain p, .explain li { line-height: 1.85; }
.formula { background: #fff; border: 2px solid var(--ink); border-radius: 10px; padding: 10px 12px; font-family: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace; font-size: 0.95rem; overflow-x: auto; white-space: pre; }
.note { background: var(--yellow-soft); border-left: 6px solid var(--yellow); padding: 10px 12px; border-radius: 0 10px 10px 0; margin: 12px 0; }
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; margin: 12px 0; }
table { border-collapse: collapse; width: 100%; font-size: 0.92rem; background: #fff; }
th, td { border: 1px solid #cfc7ad; padding: 6px 8px; text-align: right; white-space: nowrap; }
th { background: var(--yellow-soft); text-align: center; }
td.l, th.l { text-align: left; white-space: normal; min-width: 5.5em; }
td.na { color: #aaa; text-align: center; }
.faq dt { font-weight: 800; margin-top: 12px; }
.faq dd { margin: 4px 0 0; }
.sources ul { padding-left: 1.2em; }
.sources li { margin: 4px 0; font-size: 0.9rem; }

.tool-list { list-style: none; padding: 0; margin: 0; }
.tool-list li { margin: 0 0 10px; }
.tool-list a { display: block; background: #fff; border: 2px solid var(--ink); border-radius: 12px; padding: 12px 14px; text-decoration: none; color: var(--ink); box-shadow: 0 3px 0 var(--ink); }
.tool-list strong { display: block; font-size: 1.05rem; }
.tool-list span { display: block; color: var(--sub); font-size: 0.88rem; }
.hero { background: var(--ink); color: #fff; border-radius: var(--radius); padding: 18px 16px; margin: 18px 0; }
.hero h1 { color: var(--yellow); margin-top: 0; word-break: keep-all; }
.hero p { margin: 0; }

/* 楽天の紹介の枠 */
.slot { border: 2px dashed #999; border-radius: 12px; padding: 12px; margin: 16px 0; background: #fff; color: var(--ink); }
.slot.empty { color: #777; font-size: 0.85rem; text-align: center; }
.slot .pr { display: inline-block; font-size: 0.75rem; font-weight: 800; border: 1px solid var(--ink); padding: 0 6px; border-radius: 4px; margin-right: 6px; }
.slot ul { padding-left: 1.2em; margin: 8px 0 0; }

.site-footer { border-top: 3px solid var(--ink); background: #fff; padding: 18px 16px 30px; font-size: 0.86rem; }
.site-footer nav { max-width: 760px; margin: 0 auto 10px; display: flex; flex-wrap: wrap; gap: 6px 14px; }
.site-footer a { color: var(--ink); }
.foot-note { max-width: 760px; margin: 6px auto; color: var(--sub); }
.page dl.info dt { font-weight: 800; margin-top: 10px; }
.page dl.info dd { margin: 0; }
@media (min-width: 640px) { h1 { font-size: 1.8rem; } }
@media print { .site-header::after, .share, .slot, .next { display: none; } }