/* 実寸ラボ jissun-lab.com — 明るい比較メディアの文法（ライト固定） */
:root {
  color-scheme: light only;
  --bg: #ffffff;
  --bg-alt: #f5f7f9;
  --bg-tint: #eef4fb;
  --line: #e3e7eb;
  --ink: #22262c;
  --ink-2: #67707c;
  --accent: #2a78d6;      /* 図と見出しの計測ブルー */
  --accent-dark: #1c5cab;
  --cta: #d13212;         /* 白文字で5.0:1 */
  --cta-dark: #b02a0e;
  --warn: #e34948;        /* 図中の「はみ出し」 */
  --paper: #f1f3f5;       /* 図中の紙・札 */
  --ink-faint: #c4cad1;   /* 図中の補助線 */
  --grid: rgba(34, 38, 44, 0.05);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Hiragino Kaku Gothic ProN", "Yu Gothic Medium", "Yu Gothic", sans-serif;
  font-size: 16px;
  line-height: 1.95;
}
.mm, td.num {
  font-family: ui-monospace, "Cascadia Mono", "Osaka-Mono", "MS Gothic", monospace;
  font-variant-numeric: tabular-nums;
}

/* ヘッダー */
header.site {
  max-width: 840px;
  margin: 0 auto;
  padding: 20px 20px 14px;
}
.brand { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; text-decoration: none; color: var(--ink); }
.brand::before {
  content: "寸";
  display: grid;
  place-items: center;
  width: 2.1rem; height: 2.1rem;
  background: var(--accent);
  color: #fff;
  border-radius: 8px;
  font-size: 1.2rem;
  font-weight: 700;
}
.brand .name { font-size: 1.3rem; font-weight: 800; }
.brand .tag { font-size: .78rem; color: var(--ink-2); }
.ruler { height: 3px; background: var(--accent); border: none; margin: 0 auto; max-width: 840px; border-radius: 2px; }

main { max-width: 840px; margin: 0 auto; padding: 4px 20px 64px; }

/* PR表記（明瞭のまま軽く） */
.pr-notice {
  margin: 20px 0 0;
  padding: 10px 16px;
  background: var(--bg-alt);
  border-radius: 8px;
  font-size: .78rem;
  line-height: 1.8;
  color: var(--ink-2);
}

/* 見出し */
article h1, .hero h1 {
  font-size: clamp(1.35rem, 4vw, 1.7rem);
  font-weight: 800;
  line-height: 1.65;
  margin: 32px 0 8px;
  text-wrap: balance;
}
.meta { font-size: .78rem; color: var(--ink-2); margin: 0 0 28px; }
article h2 {
  font-size: 1.15rem;
  font-weight: 800;
  line-height: 1.7;
  margin: 56px 0 18px;
  padding: 10px 16px;
  background: var(--bg-tint);
  border-left: 4px solid var(--accent);
  border-radius: 6px;
  text-wrap: balance;
}
article h3 { font-size: 1rem; font-weight: 700; margin: 36px 0 8px; padding-left: 14px; position: relative; }
article h3::before {
  content: "";
  position: absolute;
  left: 0; top: .45em;
  width: 8px; height: 8px;
  background: var(--accent);
  border-radius: 2px;
}
article p { margin: 16px 0; text-wrap: pretty; }
article ul, article ol { padding-left: 1.5em; margin: 16px 0; }
article li { margin: 8px 0; }
strong { font-weight: 700; }

/* スペック表: 角丸カードの中に */
.tbl-wrap {
  overflow-x: auto;
  margin: 20px 0;
  border: 1px solid var(--line);
  border-radius: 10px;
}
table { border-collapse: collapse; width: 100%; font-size: .92rem; line-height: 1.8; }
th, td { padding: 10px 16px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); }
tr:last-child th, tr:last-child td { border-bottom: none; }
th { background: var(--bg-alt); font-weight: 600; font-size: .85rem; color: var(--ink-2); white-space: nowrap; }

/* 実寸比較図: 白カード＋薄い方眼 */
figure.jissun {
  margin: 28px 0;
  padding: 18px 14px 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, .06);
  background:
    linear-gradient(var(--grid) 1px, transparent 1px) 0 0 / 20px 20px,
    linear-gradient(90deg, var(--grid) 1px, transparent 1px) 0 0 / 20px 20px,
    #ffffff;
  overflow-x: auto;
  counter-increment: fig;
}
figure.jissun svg { display: block; max-width: 100%; height: auto; }
figure.jissun figcaption {
  font-size: .78rem;
  color: var(--ink-2);
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px solid var(--line);
}
figure.jissun figcaption::before {
  content: "図" counter(fig) "：";
  color: var(--accent);
  font-weight: 700;
}
body { counter-reset: fig; }

/* 商品リンク: CTAボタン */
.buy { margin: 18px 0 6px; display: flex; flex-wrap: wrap; gap: 10px; }
.buy a {
  display: inline-block;
  padding: 11px 26px;
  background: var(--cta);
  border-radius: 999px;
  color: #ffffff;
  text-decoration: none;
  font-size: .92rem;
  font-weight: 700;
  box-shadow: 0 1px 3px rgba(0, 0, 0, .12);
}
.buy a::after { content: " ›"; }
.buy a:hover, .buy a:focus-visible { background: var(--cta-dark); }

a { color: var(--accent); text-underline-offset: 3px; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* トップ: ヒーロー */
.hero {
  margin: 24px -20px 0;
  padding: 36px 20px 32px;
  background: var(--bg-tint);
  border-radius: 16px;
  text-align: center;
}
.hero h1 { margin: 0 auto 12px; max-width: 34em; }
.hero p { max-width: 36em; margin: 0 auto; text-align: left; }

/* トップ: セクション見出し */
.sec-title {
  font-size: 1.2rem;
  font-weight: 800;
  margin: 56px 0 18px;
  padding-bottom: 10px;
  border-bottom: 3px solid var(--accent);
  text-wrap: balance;
}

/* トップ: 使い方3ステップ */
.steps {
  list-style: none;
  padding: 0;
  margin: 16px 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.steps li {
  display: grid;
  gap: 4px;
  justify-items: start;
  padding: 18px 18px 16px;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, .06);
  font-size: .88rem;
  line-height: 1.8;
  color: var(--ink-2);
}
.steps li strong { color: var(--ink); font-size: .98rem; }
.step-no {
  display: grid;
  place-items: center;
  width: 2rem; height: 2rem;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  font-weight: 800;
  margin-bottom: 6px;
}

/* トップ: 記事カード（サムネ付き） */
.cards { list-style: none; padding: 0; margin: 12px 0; display: grid; gap: 14px; }
.cards a {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 2px 18px;
  align-items: center;
  padding: 16px 20px 16px 16px;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, .06);
  text-decoration: none;
  color: var(--ink);
  transition: box-shadow .15s, border-color .15s;
}
.thumb {
  grid-row: 1 / span 2;
  width: 96px; height: 96px;
  background: var(--bg-alt);
  border-radius: 10px;
  overflow: hidden;
}
.thumb svg { display: block; width: 100%; height: 100%; }
.cards .t { display: block; font-weight: 700; line-height: 1.7; }
.cards .d { display: block; grid-column: 2; font-size: .84rem; color: var(--ink-2); }
.cards a:hover, .cards a:focus-visible {
  border-color: var(--accent);
  box-shadow: 0 4px 12px rgba(42, 120, 214, .18);
}
.cards a:hover .t { color: var(--accent); }

/* トップ: 約束 */
.promise-list { list-style: none; padding: 0; margin: 16px 0; display: grid; gap: 12px; }
.promise-list li {
  display: grid;
  gap: 2px;
  padding: 16px 20px;
  background: var(--bg-alt);
  border-radius: 12px;
  font-size: .88rem;
  line-height: 1.8;
  color: var(--ink-2);
}
.promise-list strong { color: var(--ink); font-size: .98rem; }
.promise-list strong::before { content: "✓ "; color: var(--accent); font-weight: 800; }

/* フッター: 薄グレー帯 */
footer.site {
  background: var(--bg-alt);
  border-top: 1px solid var(--line);
  padding: 28px max(20px, calc((100% - 840px) / 2 + 20px)) 44px;
  font-size: .78rem;
  line-height: 1.9;
  color: var(--ink-2);
}
footer.site p { margin: 6px 0; }

@media (prefers-reduced-motion: reduce) {
  .cards a, .buy a, a { transition: none; }
}
@media (max-width: 640px) {
  .steps { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .buy a { width: 100%; text-align: center; }
  .cards a { grid-template-columns: 72px 1fr; gap: 2px 14px; }
  .thumb { width: 72px; height: 72px; }
}