body { font-family: system-ui, sans-serif; max-width: 860px; margin: 0 auto;
       padding: 16px; line-height: 1.5; color: #222; }
header { border-bottom: 1px solid #ddd; padding-bottom: 8px; margin-bottom: 16px; }
header a { text-decoration: none; color: #222; font-weight: 600; }
input[type=text], input[type=password], textarea { width: 100%; padding: 8px;
       margin: 4px 0; box-sizing: border-box; }
button { padding: 8px 16px; margin: 8px 0; cursor: pointer; }
button.primary { background: #b45309; color: #fff; border: none; }
table { border-collapse: collapse; width: 100%; }
td { border-bottom: 1px solid #eee; padding: 6px 8px; }
.error { color: #dc2626; }
.muted { color: #6b7280; }
.summary { border: 1px solid #ddd; padding: 16px; margin: 12px 0; }
pre { white-space: pre-wrap; }