/* Brand values deliberately copied from docs/design-guidelines.md. No build step. */
:root {
  color-scheme: light;
  --bg: #f7f4ef;
  --raised: #fdfbf7;
  --sunken: #efeae0;
  --ink: #1a1a1a;
  --muted: #5c564e;
  --line: #e2dcd0;
  --primary: #7a2e5d;
  --primary-hover: #642349;
  --accent: #b07a4a;
  font-family: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  color: var(--ink);
  background: var(--bg);
  font-synthesis: none;
  font-variant-numeric: tabular-nums;
  line-height: 1.8;
}
* { box-sizing: border-box; }
body { margin: 0; }
h1, h2, h3, p, figure { margin: 0; }
h1, h2, h3 { font-weight: 700; overflow-wrap: anywhere; }
h1 { font-size: 2rem; line-height: 1.5; letter-spacing: -.035em; }
h2 { font-size: 1.5rem; line-height: 1.55; letter-spacing: -.02em; }
h3 { font-size: 1.125rem; line-height: 1.6; }
p + p { margin-top: 1rem; }
a { color: var(--primary); text-underline-offset: .25em; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--primary); outline-offset: 5px; }
[tabindex="-1"]:focus { outline: none; }
section[id] { scroll-margin-top: 1.5rem; }
.wrap { width: min(100% - 2rem, 66rem); margin-inline: auto; }
.skip-link { position: absolute; left: 1rem; top: .5rem; padding: .75rem 1rem; background: var(--raised); z-index: 2; transform: translateY(-160%); }
.skip-link:focus { transform: none; }
.site-header { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: .5rem 2rem; padding-block: 1rem; border-bottom: 1px solid var(--ink); }
.wordmark { display: inline-flex; align-items: center; min-height: 44px; font-size: 1.5rem; font-weight: 700; letter-spacing: .04em; color: var(--ink); text-decoration: none; line-height: 1.3; }
.wordmark span { color: var(--primary); }
nav { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; }
nav a, .text-link { display: inline-flex; align-items: center; gap: .5rem; min-height: 44px; font-size: .875rem; }
.hero { padding-block: 2.5rem 3rem; display: grid; gap: 2.5rem; }
.eyebrow { font-size: .8125rem; color: var(--muted); font-weight: 500; letter-spacing: .04em; margin-bottom: 1rem; }
.lead { margin-block: 1.25rem 1.5rem; color: var(--muted); }
.button { display: inline-flex; align-items: center; justify-content: space-between; gap: 1.5rem; max-width: 100%; min-height: 52px; padding: .75rem 1.25rem; border: 1px solid var(--primary); border-radius: 6px; color: var(--raised); background: var(--primary); font-weight: 700; text-decoration: none; overflow-wrap: anywhere; line-height: 1.6; }
.button:hover { background: var(--primary-hover); text-decoration: underline; text-underline-offset: .25em; }
.button span { flex-shrink: 0; }
.cta-note { font-size: .8125rem; color: var(--muted); margin-top: .5rem; }
.hero .text-link { margin-top: .75rem; }
.wide-only { display: none; }
.ledger { background: var(--raised); border: 1px solid var(--ink); padding: 1.25rem; align-self: center; }
.ledger figcaption { font-size: .8125rem; color: var(--muted); padding-bottom: 1rem; }
.ledger figcaption span { display: block; font-size: .75rem; margin-top: .25rem; }
.ledger-heading { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .5rem; border-block: 1px solid var(--ink); padding-block: .75rem; font-size: .8125rem; }
.ledger-no { color: var(--primary); }
.ledger-name { padding-block: 1.25rem; font-size: 1.5rem; font-weight: 700; }
.ledger-name span, .ledger-entries dd span { display: block; font-size: .8125rem; font-weight: 400; color: var(--muted); margin-top: .25rem; }
.ledger-entries { margin: 0; }
.ledger-entries > div { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); gap: .75rem; padding-block: 1rem; border-top: 1px solid var(--line); }
.ledger-entries dt { color: var(--muted); font-size: .8125rem; }
.ledger-entries dd { margin: 0; font-size: .9375rem; overflow-wrap: anywhere; }
.ledger-bottom { border-top: 1px solid var(--ink); padding-top: 1rem; font-size: .8125rem; color: var(--muted); }
.section { padding-block: 2.5rem; }
.intro { border-block: 1px solid var(--ink); display: grid; gap: 1.25rem; }
.intro p, .feature p:not(.feature-label), .steps p, .customer-section p:not(.eyebrow) { color: var(--muted); }
.section-heading { margin-bottom: 1.5rem; }
.section-heading .eyebrow { margin-bottom: .5rem; }
.feature-list { border-top: 1px solid var(--line); }
.feature { display: grid; grid-template-columns: 2rem minmax(0, 1fr); gap: .75rem; padding-block: 1.5rem; border-bottom: 1px solid var(--line); }
.index { color: var(--muted); font-size: .875rem; padding-top: .125rem; }
.feature-label { font-size: .8125rem; font-weight: 500; color: var(--primary); margin-bottom: .5rem; }
.feature h3 { margin-bottom: .75rem; }
.note { font-size: .8125rem; color: var(--muted); line-height: 1.8; }
.feature-list + .note, .steps + .note { margin-top: 1.5rem; }
.usage-band { background: var(--sunken); }
.steps { list-style: none; padding: 0; margin: 0; display: grid; gap: 1.5rem; }
.steps li { border-top: 1px solid var(--muted); padding-top: 1rem; }
.step-number { font-size: .8125rem; color: var(--primary); }
.steps h3 { margin-block: .75rem; }
.customer-section { display: grid; gap: 1.25rem; border-bottom: 1px solid var(--ink); }
.customer-section .button { margin-top: 1.5rem; }
.secondary { background: transparent; color: var(--ink); border-color: var(--ink); }
.secondary:hover { background: var(--sunken); }
.faq-list { border-top: 1px solid var(--ink); }
details { border-bottom: 1px solid var(--line); }
summary { padding: 1.25rem .25rem; min-height: 44px; font-weight: 500; cursor: pointer; }
summary::marker { color: var(--primary); }
details p { padding: 0 .25rem 1.5rem; color: var(--muted); }
.closing { background: var(--ink); color: var(--bg); }
.closing-inner { padding-block: 2.5rem; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1.5rem; }
.closing p { margin-top: 1rem; }
.closing .button { background: var(--bg); color: var(--ink); border-color: var(--bg); }
.closing .button:hover { background: var(--sunken); }
.closing :focus-visible { outline-color: var(--bg); }
.site-footer { display: flex; flex-direction: column; gap: 1.5rem; padding-block: 2rem; }
.site-footer .note { margin-top: .5rem; }
.site-footer nav { flex-direction: column; align-items: flex-start; gap: .5rem; }
.site-footer small { font-size: .75rem; color: var(--muted); }
.error-page { max-width: 30rem; padding-block: 4rem; }
.error-page h1 { font-size: 1.75rem; margin-block: 1rem; }
.error-page .button { margin-top: 1.5rem; }
@media (min-width: 48rem) {
  .wrap { width: min(100% - 4rem, 66rem); }
  .site-header { padding-block: 1.25rem; }
  h1 { font-size: clamp(2rem, 3.6vw, 2.75rem); }
  h2 { font-size: 1.75rem; }
  .hero { grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); align-items: center; gap: 2.5rem; padding-block: 3.5rem; }
  .wide-only { display: initial; }
  .ledger { padding: 1.5rem; }
  .section { padding-block: 3.5rem; }
  .intro, .customer-section { grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: 3rem; }
  .feature-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 3rem; }
  .steps { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 2rem; }
  .closing-inner { padding-block: 3rem; }
  .site-footer { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 1.5rem 3rem; }
  .site-footer small { grid-column: 1 / -1; }
}