* { box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  max-width: 720px;
  margin: 2rem auto;
  padding: 0 1rem;
  color: #1a1a1a;
  background: #fafafa;
}
nav { margin-bottom: 2rem; padding-bottom: 1rem; border-bottom: 1px solid #ddd; display: flex; gap: 1rem; align-items: center; }
nav a { color: #333; text-decoration: none; }
nav a:hover { text-decoration: underline; }
nav form { margin-left: auto; }
h1 { font-size: 1.4rem; }
table { width: 100%; border-collapse: collapse; margin-top: 1rem; }
th, td { text-align: left; padding: 0.5rem; border-bottom: 1px solid #e0e0e0; }
label { display: block; margin-top: 1rem; font-weight: 600; font-size: 0.9rem; }
input[type=text], input[type=email], input[type=password], input[type=url], textarea, select {
  width: 100%; padding: 0.5rem; margin-top: 0.25rem; border: 1px solid #ccc; border-radius: 4px; font-size: 1rem;
}
textarea { min-height: 6rem; font-family: inherit; }
button, input[type=submit] {
  margin-top: 1.5rem; padding: 0.6rem 1.2rem; border: none; border-radius: 4px;
  background: #2563eb; color: #fff; font-size: 1rem; cursor: pointer;
}
button:hover { background: #1d4ed8; }
.error { color: #b91c1c; margin-top: 1rem; }
.saved { color: #15803d; margin-top: 1rem; }
.muted { color: #666; font-size: 0.9rem; }
.checkbox-row { display: flex; align-items: center; gap: 0.5rem; margin-top: 0.5rem; font-weight: normal; }
.checkbox-row input { width: auto; }
.badge { display: inline-block; padding: 0.1rem 0.5rem; border-radius: 3px; font-size: 0.8rem; }
.badge.active { background: #dcfce7; color: #166534; }
.badge.inactive { background: #fee2e2; color: #991b1b; }
.howto {
  background: #fff; border: 1px solid #e0e0e0; border-radius: 6px;
  padding: 1rem 1.25rem; margin-bottom: 1.5rem; font-size: 0.92rem; line-height: 1.5;
}
.howto h2 { font-size: 1rem; margin: 1rem 0 0.3rem; }
.howto h2:first-child { margin-top: 0; }
.howto ol, .howto ul { margin: 0.3rem 0; padding-left: 1.3rem; }
.howto li { margin-bottom: 0.3rem; }
.howto code { background: #f1f1f1; padding: 0.1rem 0.3rem; border-radius: 3px; font-size: 0.88rem; }
.howto .warn { color: #92400e; background: #fffbeb; border-left: 3px solid #f59e0b; padding: 0.5rem 0.75rem; margin: 0.5rem 0; }