:root {
  color-scheme: light;
  --ink: #18211d;
  --muted: #64706a;
  --surface: #ffffff;
  --soft: #eef3f0;
  --line: #d7ded9;
  --accent: #b42318;
  --accent-dark: #8f1c14;
  --focus: #176b87;
}

* { box-sizing: border-box; }
html { background: #f7f9f7; color: var(--ink); font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Noto Sans CJK SC", sans-serif; }
body { margin: 0; min-width: 320px; }
a { color: inherit; }
.site-header, footer { width: min(1120px, calc(100% - 40px)); margin: 0 auto; display: flex; align-items: center; justify-content: space-between; }
.site-header { min-height: 72px; border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; text-decoration: none; }
.brand-mark { display: grid; width: 34px; height: 34px; place-items: center; background: var(--ink); color: white; border-radius: 6px; }
nav { display: flex; gap: 24px; }
nav a, footer a { color: var(--muted); font-size: 14px; text-decoration: none; }
nav a:hover, footer a:hover { color: var(--ink); }
main { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.release-band { min-height: 530px; display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(300px, .65fr); gap: 72px; align-items: center; padding: 64px 0; }
.eyebrow { margin: 0 0 12px; color: var(--accent); font-size: 13px; font-weight: 700; text-transform: uppercase; }
h1, h2, p { letter-spacing: 0; }
h1 { margin: 0; font-size: 64px; line-height: 1.05; }
.summary { max-width: 650px; margin: 22px 0 30px; color: #34423b; font-size: 24px; line-height: 1.55; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.button { display: inline-flex; min-height: 44px; align-items: center; justify-content: center; padding: 0 18px; border: 1px solid var(--line); border-radius: 6px; font-weight: 650; text-decoration: none; }
.button.primary { border-color: var(--accent); background: var(--accent); color: white; }
.button.primary:hover { background: var(--accent-dark); }
.button.secondary { background: white; }
.button.is-disabled { border-color: #aeb8b2; background: #aeb8b2; cursor: default; }
.requirements { color: var(--muted); font-size: 13px; margin-top: 16px; }
.release-facts { margin: 0; background: var(--surface); border: 1px solid var(--line); border-radius: 8px; }
.release-facts div { padding: 18px 20px; border-bottom: 1px solid var(--line); }
.release-facts div:last-child { border-bottom: 0; }
.release-facts dt { color: var(--muted); font-size: 12px; }
.release-facts dd { margin: 7px 0 0; font-weight: 650; overflow-wrap: anywhere; }
.release-facts code { font-size: 11px; font-weight: 500; }
.steps { border-top: 1px solid var(--line); padding: 70px 0 84px; }
.section-heading h2 { margin: 0; font-size: 34px; }
.steps ol { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; margin: 34px 0 0; padding: 0; border: 1px solid var(--line); background: var(--line); list-style: none; }
.steps li { min-height: 160px; padding: 24px; background: var(--surface); }
.steps li::before { display: block; margin-bottom: 30px; color: var(--accent); font: 700 13px ui-monospace, monospace; content: "0" counter(list-item); }
.steps li strong, .steps li span { display: block; }
.steps li span { margin-top: 8px; color: var(--muted); line-height: 1.65; }
.trust-band { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; padding: 30px 0; border-top: 1px solid var(--line); }
.trust-band strong, .trust-band span { display: block; }
.trust-band span { margin-top: 6px; color: var(--muted); font-size: 14px; line-height: 1.6; }
footer { min-height: 84px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
.document { max-width: 760px; min-height: calc(100vh - 157px); padding: 72px 0 100px; }
.document h1 { max-width: 720px; font-size: 44px; }
.document section { padding: 30px 0; border-bottom: 1px solid var(--line); }
.document h2 { margin: 0 0 12px; font-size: 22px; }
.document p { margin: 0; color: #435049; line-height: 1.85; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }

@media (max-width: 760px) {
  .site-header, footer, main { width: min(100% - 28px, 1120px); }
  .site-header { align-items: flex-start; padding: 17px 0; }
  nav { gap: 12px; flex-wrap: wrap; justify-content: flex-end; }
  .release-band { min-height: auto; grid-template-columns: 1fr; gap: 36px; padding: 56px 0; }
  h1 { font-size: 46px; }
  .summary { font-size: 20px; }
  .steps ol, .trust-band { grid-template-columns: 1fr; }
  .steps li { min-height: 130px; }
  .document { padding-top: 52px; }
  .document h1 { font-size: 36px; }
}