:root {
  color-scheme: dark;
  --bg: #141313;
  --panel: #1e1c1a;
  --ink: #f3ece1;
  --muted: #bdb2a4;
  --gold: #d8b980;
  --edge: #484034;
  --serif: "Songti SC","Noto Serif CJK SC",Georgia,serif;
  --sans: system-ui,-apple-system,"PingFang SC",sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(ellipse at 74% 0%,#36241c 0,transparent 46%),var(--bg);
  color: var(--ink);
  font: 15px/1.65 var(--sans);
}

main {
  width: min(100% - 40px,980px);
  margin: auto;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border-bottom: 1px solid var(--edge);
  padding: 15px 0;
  color: var(--muted);
  font-size: 12px;
}

.brand {
  color: var(--gold);
  font: 600 12px/1.3 Georgia,serif;
  letter-spacing: .23em;
}

.layout {
  display: grid;
  grid-template-columns: minmax(0,1fr) minmax(0,.55fr);
  gap: 64px;
  margin: 28px 0 32px;
  align-items: start;
}

.platform {
  color: var(--gold);
  font-size: 12px;
  letter-spacing: .16em;
  margin: 0 0 7px;
}

h1,h2,p,ol {
  margin: 0;
}

h1 {
  font: 600 clamp(46px,7.6vw,76px)/1.12 var(--serif);
  letter-spacing: .055em;
}

.intro {
  margin: 12px 0 23px;
  color: var(--muted);
  font-size: 15px;
}

.action {
  background: var(--panel);
  border: 1px solid var(--edge);
  border-top: 2px solid #9b7851;
  border-radius: 9px;
  padding: 24px;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3,minmax(0,1fr));
  list-style: none;
  gap: 10px;
  padding: 0 0 17px;
  border-bottom: 1px solid var(--edge);
  margin-bottom: 19px;
  font-size: 12px;
  color: var(--muted);
}

.steps li {
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}

.steps li[aria-current] {
  color: var(--gold);
  font-weight: 650;
}

.steps li[data-done] {
  color: #e3d4be;
}

.dot {
  flex: none;
  width: 20px;
  height: 20px;
  border: 1px solid #72624e;
  display: inline-grid;
  place-items: center;
  border-radius: 50%;
  font-size: 10px;
}

[aria-current] .dot {
  background: var(--gold);
  color: #231b11;
  border-color: var(--gold);
}

h2 {
  font: 600 23px/1.35 var(--serif);
}

.action p {
  margin: 8px 0 17px;
  color: var(--muted);
}

.button {
  min-height: 48px;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gold);
  color: #20170f;
  font: 700 15px var(--sans);
  border: 1px solid var(--gold);
  border-radius: 6px;
  padding: 9px 12px;
  text-decoration: none;
  text-align: center;
  cursor: pointer;
}

.aux {
  display: block;
  margin: 8px auto 0;
  min-height: 36px;
  padding: 4px 10px;
  background: none;
  border: 0;
  text-decoration: underline;
  text-underline-offset: 3px;
  color: var(--gold);
  font: 13px/1.7 var(--sans);
  cursor: pointer;
}

aside {
  margin-top: 65px;
}

.specs {
  display: grid;
  gap: 14px;
  padding: 0;
  margin: 0 0 19px;
}

.specs div {
  display: grid;
  gap: 2px;
}

dt {
  font-size: 12px;
  color: var(--muted);
}

dd {
  margin: 0;
  font-size: 14px;
}

details {
  border-top: 1px solid var(--edge);
  padding: 10px 0;
  font-size: 13px;
  color: var(--muted);
}

summary {
  color: var(--ink);
  min-height: 32px;
  padding: 2px 0;
  cursor: pointer;
}

details p {
  margin: 4px 0 8px;
}

footer {
  border-top: 1px solid var(--edge);
  padding: 13px 0 22px;
  font-size: 12px;
  color: var(--muted);
}

:focus-visible {
  outline: 2px solid #f4dba9;
  outline-offset: 4px;
}

[hidden] {
  display: none!important;
}

@media (max-width: 700px) {
  main {
    width: min(100% - 36px,480px);
  }
  .layout {
    display: block;
    margin: 18px 0 18px;
  }
  .action {
    padding: 16px;
  }
  .intro {
    margin: 9px 0 17px;
  }
  .steps {
    margin-bottom: 13px;
    padding-bottom: 13px;
    gap: 4px;
  }
  .steps li {
    gap: 4px;
  }
  aside {
    margin-top: 22px;
  }
  .specs {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 14px;
  }
}

@media (max-width: 360px) {
  main {
    width: calc(100% - 28px);
  }
  .steps {
    font-size: 11px;
  }
  .dot {
    width: 17px;
    height: 17px;
  }
}