:root {
  color-scheme: light;
  --bg: #f6f7f9;
  --panel: #ffffff;
  --text: #20242a;
  --muted: #667085;
  --line: #d7dce3;
  --accent: #146c5c;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 32px;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
}
h1, h2, h3, p { margin: 0; }
h1 { font-size: 28px; }
h2 { font-size: 18px; margin-bottom: 12px; }
p { color: var(--muted); margin-top: 4px; }
a, button {
  color: #fff;
  background: var(--accent);
  border: 0;
  border-radius: 6px;
  padding: 10px 14px;
  text-decoration: none;
  font-weight: 650;
}
nav { display: flex; gap: 8px; flex-wrap: wrap; }
main { padding: 24px 32px; display: grid; gap: 24px; }
.narrow { max-width: 760px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; }
.node, form, section {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
}
table {
  width: 100%;
  border-collapse: collapse;
  background: var(--panel);
  border: 1px solid var(--line);
}
th, td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
}
label { display: grid; gap: 6px; margin-bottom: 14px; color: var(--muted); }
input, textarea, pre {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px;
  font: 14px ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  background: #fff;
  color: var(--text);
}
.error {
  background: #fff1f0;
  color: #9f1f17;
  border: 1px solid #f0b8b3;
  border-radius: 8px;
  padding: 12px;
}
.success {
  background: #effaf5;
  color: #116149;
  border: 1px solid #9edcc8;
  border-radius: 8px;
  padding: 12px;
}
@media (max-width: 720px) {
  header { padding: 18px; }
  main { padding: 18px; }
}