:root {
  --bg: #ffffff;
  --text: #1a1a2e;
  --muted: #55596b;
  --border: #e2e4ea;
  --accent: #2952e3;
  --card-bg: #f7f8fb;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
}
.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
}
header {
  border-bottom: 1px solid var(--border);
  padding-bottom: 1.5rem;
  margin-bottom: 2rem;
}
h1 {
  font-size: 1.6rem;
  margin: 0 0 0.4rem;
}
.subtitle {
  color: var(--muted);
  font-size: 1rem;
}
h2 {
  font-size: 1.15rem;
  margin-top: 2.2rem;
  margin-bottom: 0.6rem;
}
p, li { color: var(--text); }
.muted { color: var(--muted); }
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  margin: 1rem 0;
}
.sample-msg {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.9rem 1.1rem;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
nav.site-nav {
  margin-top: 1rem;
  font-size: 0.92rem;
}
nav.site-nav a { margin-right: 1rem; }
footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.88rem;
}
footer nav a { margin-right: 1rem; }
ul { padding-left: 1.3rem; }