/* 白い地・角なし・影なし・細い線。色はチャコールと木の色だけ */
:root {
  --bg: #FFFFFF;
  --panel: #F5F5F3;
  --ink: #333333;
  --muted: #777777;
  --wood: #9A7A55;
  --line: #E3E3E3;
  --max: 1080px;
  --text: 680px;
  color-scheme: light;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-padding-top: 24px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Noto Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.8;
  -webkit-tap-highlight-color: rgba(154, 122, 85, .2);
}

h1, h2, h3 { text-wrap: balance; font-weight: 700; }
p, li, figcaption { text-wrap: pretty; overflow-wrap: break-word; }

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

a { color: var(--ink); text-decoration: none; touch-action: manipulation; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }

.skip-link { position: absolute; left: 16px; top: -60px; background: var(--ink); color: #fff; padding: 10px 16px; z-index: 10; }
.skip-link:focus { top: 12px; color: #fff; }

/* header / footer */
.site-header { border-bottom: 1px solid var(--line); padding: 14px 0; }
.site-header .inner, .site-footer .inner {
  max-width: var(--max); margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
}
.site-header .logo img { height: 30px; width: auto; }
.site-nav { display: flex; align-items: center; gap: 24px; font-size: 14px; }
.site-nav a { padding: 6px 0; }
.site-nav a[aria-current="page"] { font-weight: 700; }
.site-nav .nav-cta { padding: 7px 16px; border: 1px solid var(--ink); }
.site-nav .nav-cta:hover { background: var(--ink); color: #fff; text-decoration: none; }
.site-footer { background: var(--panel); margin-top: 96px; padding: 32px 0; font-size: 13px; color: var(--muted); }
.site-footer a { color: var(--muted); }

/* buttons */
.button {
  display: inline-flex; align-items: center; justify-content: center; min-height: 48px; min-width: 240px;
  background: var(--ink); color: #fff; border: 1px solid var(--ink);
  padding: 12px 28px; font-size: 15px; font-weight: 700; letter-spacing: .02em;
  transition: background-color .15s ease, color .15s ease;
}
.button:hover { background: #000; color: #fff; text-decoration: none; }
.text-link { font-size: 14px; text-decoration: underline; text-underline-offset: 3px; }

/* home */
.eyebrow { font-size: 13px; letter-spacing: .08em; color: var(--muted); margin: 0 0 14px; }

.hero { max-width: var(--max); margin: 40px auto 0; padding: 0 24px; display: grid; grid-template-columns: 1fr 1.25fr; gap: 56px; align-items: center; }
.hero h1 { font-size: 34px; line-height: 1.35; margin: 0 0 20px; }
.hero .sub { color: var(--muted); margin: 0 0 32px; font-size: 15px; }
.hero .actions { display: flex; align-items: center; gap: 24px; flex-wrap: wrap; }

.trust { max-width: var(--max); margin: 56px auto 0; padding: 0 24px; }
.trust ul { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--line); }
.trust li { padding: 22px 16px; text-align: center; font-size: 14px; font-weight: 700; }
.trust li + li { border-left: 1px solid var(--line); }

.section { max-width: var(--max); margin: 80px auto 0; padding: 0 24px; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin: 0 0 20px; }
.section > h2, .section-head h2 { font-size: 20px; line-height: 1.4; margin: 0 0 20px; }
.section-head h2 { margin: 0; }
.section-head a { font-size: 13px; color: var(--wood); white-space: nowrap; }
.section > .intro { color: var(--muted); max-width: var(--text); margin: -8px 0 24px; font-size: 14px; }

.product { display: grid; grid-template-columns: 1.2fr 1fr; gap: 48px; align-items: center; }
.product img { aspect-ratio: 4 / 3; object-fit: cover; width: 100%; }
.product h3 { font-size: 22px; line-height: 1.4; margin: 0 0 8px; }
.product p { margin: 0 0 20px; color: var(--muted); font-size: 15px; }
.specs { margin: 0 0 28px; display: grid; grid-template-columns: auto 1fr; font-size: 14px; border-top: 1px solid var(--line); }
.specs dt, .specs dd { padding: 10px 0; border-bottom: 1px solid var(--line); }
.specs dt { font-weight: 700; padding-right: 20px; }
.specs dd { margin: 0; color: var(--muted); font-variant-numeric: tabular-nums; }

.pages { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin: 0; }
.pages figure { margin: 0; }
.pages img { border: 1px solid var(--line); }
.pages figcaption { margin-top: 10px; font-size: 13px; color: var(--muted); line-height: 1.6; }
.pages figcaption strong { display: block; color: var(--ink); font-size: 14px; }

.steps { list-style: none; counter-reset: step; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--line); }
.steps li { counter-increment: step; padding: 28px 24px; }
.steps li + li { border-left: 1px solid var(--line); }
.steps li::before { content: "0" counter(step); display: block; font-size: 13px; letter-spacing: .1em; color: var(--wood); margin-bottom: 8px; }
.steps h3 { font-size: 16px; margin: 0 0 6px; }
.steps p { margin: 0; color: var(--muted); font-size: 14px; }

.faq { max-width: var(--text); }
.faq details { border-bottom: 1px solid var(--line); }
.faq details:first-child { border-top: 1px solid var(--line); }
.faq summary { cursor: pointer; list-style: none; padding: 16px 36px 16px 0; font-size: 15px; font-weight: 700; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 4px; top: 13px; font-size: 20px; font-weight: 400; color: var(--muted); }
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: 0 0 18px; color: var(--muted); font-size: 14px; }

.closing { max-width: var(--max); margin: 80px auto 0; padding: 0 24px; }
.closing .inner { background: var(--panel); padding: 48px 32px; text-align: center; }
.closing h2 { font-size: 20px; line-height: 1.4; margin: 0 0 8px; }
.closing p { margin: 0 auto 24px; max-width: 520px; color: var(--muted); font-size: 14px; }

.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(300px, 100%), 1fr)); gap: 32px 24px; }
.card { display: flex; flex-direction: column; }
.card img { aspect-ratio: 4 / 3; object-fit: cover; width: 100%; }
.card .body { padding: 14px 0 0; display: flex; flex-direction: column; gap: 6px; flex: 1; }
.card h3 { font-size: 16px; margin: 0; line-height: 1.5; }
.card p { margin: 0; color: var(--muted); font-size: 14px; }
.card .more { margin-top: auto; padding-top: 4px; font-size: 13px; color: var(--wood); }
.cards:has(> .card-wide) { grid-template-columns: 1fr; }
.card-wide { display: grid; grid-template-columns: 1fr 1.2fr; gap: 32px; align-items: center; }
.card-wide .body { padding: 0; }
.card-wide h3 { font-size: 20px; }
.card-wide .more { margin-top: 8px; }

/* article */
.article { max-width: var(--text); margin: 40px auto 0; padding: 0 24px; }
.article .meta { color: var(--muted); font-size: 13px; margin: 0 0 8px; }
.article h1 { font-size: 30px; line-height: 1.35; margin: 0 0 20px; }
.article .lead { font-size: 17px; color: var(--muted); }
.article h2 { font-size: 22px; line-height: 1.4; margin: 64px 0 12px; padding-bottom: 10px; border-bottom: 1px solid var(--line); }
.article h3 { font-size: 17px; margin: 32px 0 8px; }
.article a { text-decoration: underline; text-underline-offset: 3px; text-decoration-color: var(--wood); }
.article figure { margin: 32px 0; }
.article figure.wide { margin-left: -60px; margin-right: -60px; }
.article figure img { width: 100%; }
.article figure.drawing img { border: 1px solid var(--line); padding: 8px; }
.article figcaption { font-size: 13px; color: var(--muted); margin-top: 8px; }
.article ul, .article ol { padding-left: 1.3em; }
.article li { margin: 4px 0; }
.table-wrap { overflow-x: auto; margin: 16px 0; }
.article table { border-collapse: collapse; width: 100%; font-size: 14px; font-variant-numeric: tabular-nums; border-top: 1px solid var(--ink); }
.article th, .article td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
.article thead th, .article thead td { background: var(--panel); font-weight: 700; }
.article tbody th { font-weight: 700; white-space: nowrap; }
.note { background: var(--panel); padding: 14px 18px; margin: 24px 0; }
.cta { background: var(--panel); padding: 32px; margin: 64px 0 0; }
.cta h2 { margin-top: 0; border-bottom: 0; padding-bottom: 0; }
.article .cta .button { text-decoration: none; }

.page { max-width: var(--text); margin: 40px auto 0; padding: 0 24px; }
.page h1 { font-size: 28px; line-height: 1.35; }
.page h2 { font-size: 18px; margin: 36px 0 8px; }
.page a:not(.button) { text-decoration: underline; text-underline-offset: 3px; }

.visually-h2 { font-size: 20px; line-height: 1.4; margin: 0 0 20px; }

@media (max-width: 820px) {
  .hero { grid-template-columns: 1fr; gap: 24px; margin-top: 0; padding: 0; }
  .hero > div { padding: 0 20px; }
  .hero h1 { font-size: 26px; }
  .hero img { order: -1; }
  .hero .actions { justify-content: center; }
  .hero .actions .button { width: 100%; }
  .section, .closing, .trust, .article, .page { padding: 0 20px; }
  .trust ul { grid-template-columns: 1fr 1fr; }
  .trust li:nth-child(3) { border-left: 0; }
  .trust li:nth-child(n+3) { border-top: 1px solid var(--line); }
  .section, .closing { margin-top: 64px; }
  .product { grid-template-columns: 1fr; gap: 20px; }
  .product .button { width: 100%; }
  .pages, .steps { grid-template-columns: 1fr; }
  .pages { gap: 28px; }
  .steps li + li { border-left: 0; border-top: 1px solid var(--line); }
  .card-wide { grid-template-columns: 1fr; gap: 0; }
  .card-wide .body { padding-top: 14px; }
  .closing .inner { padding: 36px 20px; }
  .closing .button, .cta .button { width: 100%; min-width: 0; }
  .article h1 { font-size: 25px; }
  .article figure.wide { margin-left: -20px; margin-right: -20px; }
  .cta { padding: 24px 20px; }
  .site-header .logo img { height: 26px; }
  .site-nav { gap: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  .button { transition: none; }
}