:root {
  color-scheme: light dark;
  --bg: #fbfaf8;
  --panel: #ffffff;
  --border: #e6e2db;
  --text: #23201c;
  --muted: #6b645b;
  --accent: #9a482b;
  --accent-soft: #fbeee4;
  --code-bg: #f3f0eb;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1a1815;
    --panel: #22201c;
    --border: #35312b;
    --text: #ece7df;
    --muted: #a49b8f;
    --accent: #dd9264;
    --accent-soft: #2b241c;
    --code-bg: #2a2622;
  }
}

* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family:
    system-ui,
    -apple-system,
    "Hiragino Sans",
    "Noto Sans JP",
    sans-serif;
  line-height: 1.8;
  font-size: 16px;
}
main {
  max-width: 54rem;
  margin: 0 auto;
  padding: 0 1.5rem 5rem;
}
a {
  color: var(--accent);
}
h1,
h2,
h3 {
  line-height: 1.4;
  letter-spacing: 0.01em;
}
h2 {
  margin-top: 3.5rem;
  font-size: 1.4rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--border);
}
h3 {
  margin-top: 2.5rem;
  font-size: 1.08rem;
}
code {
  background: var(--code-bg);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  font-size: 0.9em;
}

header.hero {
  padding: 4rem 1.5rem 2.75rem;
  text-align: center;
  background: var(--accent-soft);
  border-bottom: 1px solid var(--border);
}
header.hero img {
  width: 7.5rem;
  height: 7.5rem;
  border-radius: 50%;
  display: block;
  margin: 0 auto 1.25rem;
  border: 3px solid var(--panel);
  box-shadow: 0 4px 16px rgb(0 0 0 / 0.14);
}
header.hero h1 {
  margin: 0 0 0.75rem;
  font-size: 2.1rem;
}
header.hero p {
  margin: 0 auto;
  max-width: 36rem;
  color: var(--muted);
  font-size: 1.05rem;
}
header.hero .back {
  display: inline-block;
  margin-top: 1.25rem;
  font-size: 0.9rem;
}

.lead {
  margin-top: 3rem;
  font-size: 1.05rem;
}

.steps {
  list-style: none;
  counter-reset: step;
  padding: 0;
  margin: 2rem 0 0;
}
.steps li {
  counter-increment: step;
  position: relative;
  padding: 0 0 0 3.25rem;
  margin-bottom: 1.75rem;
}
.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0.1rem;
  width: 2.1rem;
  height: 2.1rem;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 0.95rem;
}
.steps strong {
  display: block;
}

.note {
  border-left: 3px solid var(--accent);
  padding: 0.1rem 0 0.1rem 1rem;
  color: var(--muted);
  margin: 1.5rem 0;
}

.table-scroll {
  overflow-x: auto;
  margin: 1.5rem 0;
}
table {
  border-collapse: collapse;
  width: 100%;
  min-width: 30rem;
}
th,
td {
  text-align: left;
  padding: 0.65rem 0.8rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
th {
  font-size: 0.85rem;
  color: var(--muted);
  font-weight: 600;
}
td code {
  white-space: nowrap;
}

.chat {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  font-size: 0.95rem;
}
.chat .who {
  color: var(--accent);
  font-weight: 600;
}
.chat .buttons {
  margin-top: 0.75rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.chat .buttons span {
  border: 1px solid var(--border);
  background: var(--code-bg);
  border-radius: 6px;
  padding: 0.35rem 0.85rem;
  font-size: 0.85rem;
}

.perm {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0;
  margin: 1.25rem 0;
  list-style: none;
}
.perm li {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.3rem 0.9rem;
  font-size: 0.9rem;
  background: var(--panel);
}

.release {
  margin-top: 2.5rem;
}
.release h3 {
  margin: 0 0 0.25rem;
  font-size: 1.15rem;
}
.release .date {
  color: var(--muted);
  font-size: 0.85rem;
}
.release ul {
  margin: 0.9rem 0 0;
  padding-left: 1.3rem;
}
.release li {
  margin-bottom: 0.5rem;
}

footer {
  border-top: 1px solid var(--border);
  margin-top: 4rem;
  padding: 2rem 1.5rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
}
footer img {
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 50%;
  display: block;
  margin: 0 auto 0.6rem;
}
footer p {
  margin: 0;
}