:root {
  color-scheme: light;
  --background: #F7F7F5;
  --surface: #FFFFFF;
  --text: #171717;
  --muted: #5F5F5A;
  --line: #D8D8D2;
  --verified: #45534C;
  --information: #2F6F87;
  --participation: #A52F50;
  --preparation: #6F5A1F;
  font-family: Inter, "Noto Sans JP", "Yu Gothic UI", "Segoe UI Variable", system-ui, sans-serif;
  color: var(--text);
  background: var(--background);
  font-synthesis: none;
  scroll-behavior: smooth;
}
* { box-sizing: border-box; }
body { margin: 0; font-size: 16px; line-height: 1.65; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 5px; }
button { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button, summary { cursor: pointer; }
button:disabled { cursor: not-allowed; }
:focus-visible { outline: 2px solid var(--information); outline-offset: 5px; }
[id] { scroll-margin-top: 24px; }
img { display: block; max-width: 100%; height: auto; }
svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.4; stroke-linecap: round; stroke-linejoin: round; flex: 0 0 auto; }
h1, h2, h3, p, figure, ol, dl { margin: 0; }
h1, h2, h3 { font-weight: 500; }
h1 { max-width: 850px; font-size: clamp(40px, 3.9vw, 56px); line-height: 1.16; letter-spacing: -.035em; text-wrap: balance; }
h2 { font-size: 30px; line-height: 1.3; letter-spacing: -.025em; text-wrap: balance; }
h3 { font-size: 17px; line-height: 1.45; }
p { color: var(--muted); }
p + p { margin-top: 16px; }
.shell { width: min(100% - 96px, 1480px); margin-inline: auto; }
.skip-link { position: absolute; left: 16px; top: 8px; padding: 12px 20px; background: var(--surface); z-index: 5; transform: translateY(-150%); }
.skip-link:focus { transform: none; }
.site-header { display: flex; align-items: center; min-height: 96px; gap: 32px; border-bottom: 1px solid var(--line); }
.brand { display: flex; min-height: 44px; align-items: center; flex-shrink: 0; }
.brand img { width: 148px; }
.site-nav { display: flex; align-items: center; gap: 28px; margin-left: auto; }
.site-nav a, .header-download { font-size: 13px; text-decoration: none; display: flex; align-items: center; min-height: 44px; }
.site-nav a:hover, .site-footer a:hover { text-decoration: underline; }
.header-tools { display: flex; gap: 24px; align-items: center; }
.language-switch { display: flex; align-items: center; color: var(--muted); font-size: 13px; }
.language-switch button { padding: 0; width: 44px; min-height: 44px; border: 0; background: transparent; color: var(--muted); font-size: 13px; }
.language-switch button[aria-pressed="true"] { color: var(--text); text-decoration: underline; text-underline-offset: 5px; }
.header-download { border: 1px solid var(--muted); padding: 0 16px; white-space: nowrap; }
.header-download:hover, .button:hover { background: var(--surface); }
.menu-toggle { display: none; }
.hero { padding: 80px 0 48px; }
.hero-japanese { margin-top: 24px; color: var(--text); font-size: 24px; line-height: 1.5; }
.hero-description { max-width: 440px; margin-top: 36px; font-size: 18px; line-height: 1.5; }
.hero-actions { display: flex; gap: 16px; margin-top: 32px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 16px; border: 1px solid var(--muted); padding: 10px 20px; min-height: 44px; font-size: 14px; text-decoration: none; }
.hero-bottom { display: grid; grid-template-columns: .85fr 1.15fr; align-items: end; gap: 32px; margin-top: 48px; }
.status { display: flex; gap: 16px; align-items: center; font-size: 13px; padding-bottom: 16px; }
.status::before { content: ""; width: 40px; height: 2px; background: var(--verified); flex-shrink: 0; }
.workflow-strip { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 16px; }
.workflow-strip li { position: relative; display: flex; align-items: flex-start; flex-direction: column; gap: 14px; font-size: 12px; line-height: 1.45; }
.step-dot { display: grid; place-items: center; width: 30px; height: 30px; border: 1px solid var(--muted); border-radius: 50%; font-size: 14px; }
.workflow-strip li:not(:last-child)::after { content: ""; position: absolute; top: 15px; left: 42px; right: 0; border-top: 1px solid var(--line); }
.section { padding: 48px 0; border-top: 1px solid var(--line); }
.section-intro { display: grid; grid-template-columns: minmax(220px, .8fr) minmax(0, 1.65fr); gap: 64px; }
.section-intro > h2 { max-width: 330px; }
.steps-grid { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 48px; row-gap: 32px; }
.steps-grid li { padding: 0 32px; border-left: 1px solid var(--line); }
.steps-grid li:nth-child(3n + 1) { padding-left: 0; border-left: 0; }
.steps-grid li:nth-child(3n) { padding-right: 0; }
.steps-grid h3 { display: flex; align-items: baseline; gap: 20px; }
.number { font-size: 20px; font-variant-numeric: tabular-nums; }
.steps-grid p { margin-top: 16px; font-size: 14px; }
.project-note { display: grid; grid-template-columns: .8fr 1.65fr; gap: 64px; border-top: 1px solid var(--line); padding-top: 32px; margin-top: 40px; }
.project-note p { font-size: 14px; }
.workload-grid { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 40px; }
.workload-grid article { padding: 0 32px; border-left: 1px solid var(--line); }
.workload-grid article:first-child { padding-left: 0; border: 0; }
.workload-grid article:last-child { padding-right: 0; }
.workload-number { display: block; font-size: 24px; font-variant-numeric: tabular-nums; margin-bottom: 12px; }
.participation { color: var(--participation); }
.information { color: var(--information); }
.preparation, .coming-soon { color: var(--preparation); }
.workload-grid h3 { margin-bottom: 16px; }
.workload-grid p { font-size: 14px; }
.caption, .workload-grid .caption { font-size: 12px; line-height: 1.6; color: var(--muted); }
.device-note { display: flex; align-items: baseline; gap: 20px; margin-top: 36px; }
.device-note p { font-size: 13px; }
.note-label { font-size: 12px; color: var(--information); flex-shrink: 0; font-weight: 500; }
.section-description { font-size: 14px; max-width: 850px; margin-top: 20px; }
.product-grid { display: grid; grid-template-columns: 1.65fr 1fr; gap: 32px; align-items: start; margin-top: 32px; }
figure a { display: block; border: 1px solid var(--line); background: var(--surface); }
figure a:hover { border-color: var(--muted); }
figure img { width: 100%; }
figcaption { display: flex; flex-direction: column; gap: 6px; padding-top: 12px; font-size: 12px; line-height: 1.6; color: var(--muted); }
figcaption strong { color: var(--text); font-size: 14px; font-weight: 500; }
.product-side { display: grid; gap: 28px; }
.wallet-figure a { display: flex; justify-content: center; }
.wallet-figure img { width: auto; max-height: 380px; }
.additional-screens { margin-top: 32px; border-top: 1px solid var(--line); }
summary { min-height: 52px; padding: 14px 0; font-size: 14px; list-style-position: outside; margin-left: 18px; }
summary::marker { font-size: 11px; }
.additional-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; margin: 20px 0 0; align-items: start; }
.contribution-section { display: grid; grid-template-columns: repeat(2, 1fr); gap: 48px; }
.contribution-section article + article { border-left: 1px solid var(--line); padding-left: 48px; }
.small-rule { width: 64px; height: 2px; background: var(--verified); margin: 24px 0; }
.key-properties { font-size: 14px; color: var(--text); }
.fact-rows { margin-top: 24px; font-size: 14px; }
.fact-rows > div { display: grid; grid-template-columns: 1fr 1.8fr; gap: 24px; padding: 16px 0; border-top: 1px solid var(--line); }
dd { margin: 0; color: var(--muted); }
.technical-details { margin-top: 24px; }
.details-body { max-width: 850px; margin: 8px 0 0 auto; font-size: 14px; }
.film-reservation { display: flex; align-items: center; justify-content: center; border: 1px solid var(--line); min-height: 112px; padding: 24px; margin: 0 0 40px; text-align: center; }
.film-reservation h2 { font-size: 20px; letter-spacing: 0; }
.download-rows { margin-top: 24px; }
.download-rows > div { display: grid; grid-template-columns: minmax(0, 1.5fr) .7fr auto; align-items: center; gap: 24px; padding: 18px 0; border-bottom: 1px solid var(--line); }
.download-rows h3 { font-size: 14px; }
.download-rows span { font-size: 12px; }
.download-rows button { min-height: 44px; min-width: 128px; font-size: 13px; border: 1px solid var(--line); color: var(--muted); padding: 8px 16px; background: transparent; opacity: 1; }
.download-rows a.download-button { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; min-width: 176px; padding: 8px 16px; font-size: 13px; font-weight: 600; border: 1px solid var(--text); color: var(--text); background: transparent; text-decoration: none; }
.download-rows a.download-button:hover, .download-rows a.download-button:focus-visible { background: var(--surface); border-color: var(--verified); color: var(--verified); }
.download-rows .release-version { color: var(--muted); }
.release-details { margin-top: 16px; }
.release-fields { font-size: 13px; margin: 8px 0; }
.release-fields > div { display: grid; grid-template-columns: 1fr 1fr; padding: 8px 0; gap: 16px; }
.release-fields code, .release-hash { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 12px; overflow-wrap: anywhere; }
.release-notes { font-size: 13px; margin: 8px 0 0; max-width: 72ch; }
.smartscreen-note { max-width: 82ch; margin-top: 8px; }
.faq { margin-top: 48px; }
.faq > h3 { margin-bottom: 16px; }
.faq details { border-top: 1px solid var(--line); }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { font-size: 16px; min-height: 56px; }
.faq details p { padding: 0 24px 24px 18px; max-width: 950px; font-size: 14px; }
.site-footer { display: flex; justify-content: space-between; gap: 48px; padding: 32px 0 48px; border-top: 1px solid var(--line); }
.footer-brand { display: inline-flex; align-items: center; min-height: 44px; font-size: 24px; text-decoration: none; }
.site-footer .caption { max-width: 300px; }
.site-footer nav { display: flex; flex-wrap: wrap; align-content: start; justify-content: flex-end; gap: 0 28px; max-width: 680px; }
.site-footer nav a { display: inline-flex; align-items: center; min-height: 44px; font-size: 13px; text-decoration: none; }
html[lang="ja"] h1 { max-width: 900px; letter-spacing: -.025em; line-height: 1.35; }
html[lang="ja"] .hero-japanese { font-size: 20px; }
html[lang="ja"] h2 { line-height: 1.5; }
@media (max-width: 1180px) {
  .site-header { gap: 24px; }
  .site-nav { gap: 20px; }
  .header-tools { gap: 12px; }
  .header-download { font-size: 12px; padding-inline: 12px; }
  .hero-bottom { grid-template-columns: .7fr 1.3fr; }
  .section-intro, .project-note { gap: 40px; }
  .download-rows > div { gap: 16px; }
}
@media (max-width: 1000px) {
  .shell { width: calc(100% - 48px); }
  .site-header { flex-wrap: wrap; gap: 8px 24px; padding-block: 16px; min-height: 88px; }
  .brand { margin-right: auto; }
  .header-tools { margin-left: auto; }
  .site-nav { order: 3; width: 100%; justify-content: flex-end; }
  .hero { padding-top: 64px; }
  .hero-bottom { grid-template-columns: 1fr; margin-top: 40px; }
  .workflow-strip { max-width: 640px; margin-left: auto; width: 100%; }
  .status { padding-bottom: 0; }
  .section-intro, .project-note { grid-template-columns: .9fr 1.5fr; gap: 32px; }
  .steps-grid li, .workload-grid article { padding-inline: 24px; }
  .steps-grid h3 { gap: 12px; }
  .product-grid { gap: 24px; }
  .contribution-section { gap: 32px; }
  .contribution-section article + article { padding-left: 32px; }
  .download-rows > div { grid-template-columns: 1fr auto; }
  .download-rows span { grid-column: 1; }
  .download-rows button { grid-column: 2; grid-row: 1 / span 2; }
  .download-rows a.download-button { grid-column: 2; grid-row: 1 / span 2; }
  .site-footer { gap: 32px; }
}
@media (max-width: 700px) {
  .shell { width: calc(100% - 32px); }
  body { font-size: 15px; line-height: 1.75; }
  .site-header { gap: 8px 12px; padding-block: 12px; }
  .brand img { width: 124px; }
  .header-tools { margin-left: 0; gap: 8px; }
  .header-download { display: none; }
  .language-switch button { width: 36px; min-width: 44px; }
  .js .menu-toggle { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; padding: 0 8px; border: 0; background: transparent; font-size: 13px; order: 2; }
  .site-nav { flex-wrap: wrap; gap: 0 24px; justify-content: flex-start; border-top: 1px solid var(--line); padding-top: 8px; }
  .js .site-nav { display: none; }
  .js .site-nav.is-open { display: flex; }
  .site-nav a { font-size: 14px; }
  h1 { font-size: 34px; line-height: 1.2; letter-spacing: -.03em; }
  h2 { font-size: 28px; }
  h3 { font-size: 16px; }
  .hero { padding: 48px 0 40px; }
  .hero-japanese { font-size: 19px; margin-top: 24px; }
  .hero-description { font-size: 16px; margin-top: 28px; max-width: 360px; }
  .hero-actions { margin-top: 24px; gap: 12px; }
  .button { padding-inline: 16px; font-size: 13px; gap: 10px; }
  .hero-bottom { gap: 28px; margin-top: 32px; }
  .status { font-size: 12px; gap: 12px; }
  .status::before { width: 24px; }
  .workflow-strip { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px 16px; margin: 0; }
  .workflow-strip li { font-size: 12px; gap: 8px; }
  .workflow-strip li:nth-child(3)::after { display: none; }
  .section { padding: 36px 0; }
  .section-intro, .project-note { grid-template-columns: 1fr; gap: 24px; }
  .section-intro > h2 { max-width: 390px; }
  .steps-grid { grid-template-columns: 1fr; margin-top: 28px; row-gap: 0; }
  .steps-grid li, .steps-grid li:nth-child(3n + 1), .steps-grid li:nth-child(3n) { border-left: 0; border-top: 1px solid var(--line); padding: 20px 0; }
  .steps-grid h3 { gap: 18px; }
  .steps-grid p { margin-top: 10px; padding-left: 42px; }
  .project-note { margin-top: 12px; padding-top: 24px; gap: 12px; }
  .workload-grid { grid-template-columns: 1fr; margin-top: 24px; gap: 24px; }
  .workload-grid article, .workload-grid article:first-child, .workload-grid article:last-child { padding: 20px 0 0; border-left: 0; border-top: 1px solid var(--line); }
  .workload-number { font-size: 22px; margin-bottom: 8px; }
  .workload-grid h3 { margin-bottom: 12px; }
  .device-note { align-items: start; gap: 12px; margin-top: 28px; }
  .product-grid { grid-template-columns: 1fr; margin-top: 24px; gap: 28px; }
  .product-side { grid-template-columns: 1fr; }
  .wallet-figure img { max-height: 440px; }
  .additional-grid { grid-template-columns: 1fr; gap: 28px; }
  .contribution-section { grid-template-columns: 1fr; gap: 32px; }
  .contribution-section article + article { padding: 32px 0 0; border-left: 0; border-top: 1px solid var(--line); }
  .small-rule { margin: 20px 0; width: 48px; }
  .fact-rows > div { grid-template-columns: 1fr; gap: 6px; padding: 16px 0; }
  .film-reservation { min-height: 100px; padding: 24px 16px; margin-bottom: 32px; }
  .film-reservation h2 { font-size: 18px; line-height: 1.5; }
  .download-rows > div { gap: 4px 16px; }
  .download-rows button { min-width: 112px; font-size: 12px; padding-inline: 12px; }
  .download-rows a.download-button { min-width: 148px; font-size: 12px; padding-inline: 12px; }
  .faq { margin-top: 32px; }
  .faq summary { font-size: 15px; }
  .site-footer { flex-direction: column; gap: 20px; padding-bottom: 32px; }
  .site-footer nav { justify-content: flex-start; gap: 0 24px; }
  html[lang="ja"] h1 { font-size: 32px; }
  html[lang="ja"] .hero-japanese { font-size: 16px; max-width: 340px; }
}
@media (prefers-reduced-motion: reduce) { :root { scroll-behavior: auto; } }