:root {
  --bg: #fbfaf7;
  --card: #ffffff;
  --text: #1d1d1f;
  --muted: #5f6368;
  --line: #e5e2dc;
  --accent: #c2410c;
  --accent-soft: #fff1e8;
  --draft: #fef3c7;
  --draft-text: #78350f;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17171a;
    --card: #212126;
    --text: #f2f2f4;
    --muted: #a4a4ad;
    --line: #34343b;
    --accent: #fb923c;
    --accent-soft: #2e2119;
    --draft: #3a2f12;
    --draft-text: #fde68a;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN",
    "Noto Sans JP", "Yu Gothic", sans-serif;
  font-size: 17px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); }

.draft-banner {
  background: var(--draft);
  color: var(--draft-text);
  font-size: 14px;
  text-align: center;
  padding: 8px 16px;
}

.wrap {
  max-width: 760px;
  margin: 0 auto;
  padding-inline: 20px;
}

header.site {
  border-bottom: 1px solid var(--line);
}

header.site .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-block: 14px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  font-size: 19px;
}

.brand img { width: 36px; height: 36px; }

nav.site { display: flex; gap: 18px; font-size: 15px; flex-wrap: wrap; }
nav.site a { color: var(--muted); text-decoration: none; }
nav.site a:hover { color: var(--text); }

main { padding-block: 40px 64px; }

.hero { text-align: center; padding-block: 24px 40px; }
.hero img { width: 112px; height: 112px; }
.hero h1 { font-size: 34px; line-height: 1.3; margin: 16px 0 8px; }
.hero p.lead { font-size: 19px; color: var(--muted); margin: 0 auto; max-width: 34em; }
.hero p.platform { font-size: 17px; font-weight: 600; margin: 14px auto 0; }

h1 { font-size: 28px; line-height: 1.4; }
h2 { font-size: 22px; line-height: 1.4; margin-top: 48px; }
h3 { font-size: 18px; margin-top: 28px; }

.steps {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
}

.steps li, .card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px 18px;
}

.steps li strong { display: block; color: var(--accent); font-size: 14px; }

.note { color: var(--muted); font-size: 14px; }

.todo {
  background: var(--accent-soft);
  border-left: 4px solid var(--accent);
  padding: 8px 12px;
  font-size: 15px;
}

table { width: 100%; border-collapse: collapse; font-size: 15px; }
th, td { border-bottom: 1px solid var(--line); padding: 10px 8px; text-align: left; vertical-align: top; }
th { width: 34%; color: var(--muted); font-weight: 600; }

.table-scroll { overflow-x: auto; }

footer.site {
  border-top: 1px solid var(--line);
  font-size: 14px;
  color: var(--muted);
}

footer.site .wrap { padding-block: 24px; display: flex; gap: 18px; flex-wrap: wrap; }
footer.site a { color: var(--muted); }