:root {
  --fg: #1c1c1e;
  --fg-soft: #5a5a5f;
  --bg: #ffffff;
  --bg-soft: #f5f5f7;
  --accent: #e8590c;
  --border: #e3e3e6;
  --code-bg: #f0f0f2;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--fg);
  background: var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif;
  line-height: 1.8;
  font-size: 16px;
}

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

header.site .inner {
  max-width: 760px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: baseline;
  gap: 20px;
  flex-wrap: wrap;
}

header.site .brand {
  font-weight: 700;
  font-size: 18px;
  color: var(--fg);
  text-decoration: none;
}

header.site nav a {
  color: var(--fg-soft);
  text-decoration: none;
  margin-right: 14px;
  font-size: 14px;
}

header.site nav a:hover { color: var(--accent); }

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}

h1 { font-size: 28px; line-height: 1.4; }
h2 { font-size: 20px; margin-top: 2.2em; border-bottom: 1px solid var(--border); padding-bottom: 6px; }
h3 { font-size: 16px; margin-top: 1.8em; }

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

p.lead { font-size: 18px; color: var(--fg-soft); }

code {
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.88em;
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
}

pre {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  overflow-x: auto;
  line-height: 1.6;
}

pre code { background: none; padding: 0; font-size: 13px; }

table {
  border-collapse: collapse;
  width: 100%;
  font-size: 14px;
  margin: 1em 0;
}

th, td {
  border: 1px solid var(--border);
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
}

th { background: var(--bg-soft); }

.note {
  background: var(--bg-soft);
  border-left: 4px solid var(--accent);
  border-radius: 0 8px 8px 0;
  padding: 10px 16px;
  margin: 1.2em 0;
  font-size: 14px;
}

.steps { counter-reset: step; list-style: none; padding-left: 0; }
.steps li {
  counter-increment: step;
  margin: 14px 0;
  padding-left: 44px;
  position: relative;
}
.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 2px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
}

footer.site {
  border-top: 1px solid var(--border);
  color: var(--fg-soft);
  font-size: 13px;
}
footer.site .inner {
  max-width: 760px;
  margin: 0 auto;
  padding: 20px;
}
footer.site a { color: var(--fg-soft); margin-right: 14px; }