:root {
  color-scheme: light dark;
  --bg: #f7f7f5;
  --card: #ffffff;
  --ink: #1b1b1a;
  --muted: #6b6b66;
  --line: #e2e2dd;
  --accent: #2f6f4f;
  --warn: #a8621b;
  --bad: #a32b2b;
  --ok: #2f6f4f;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16171a;
    --card: #1e2023;
    --ink: #e8e8e4;
    --muted: #9a9a94;
    --line: #2e3136;
    --accent: #6fbf8f;
    --warn: #d99a54;
    --bad: #e0736f;
    --ok: #6fbf8f;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
header, main, footer { max-width: 980px; margin: 0 auto; padding: 0 16px; }
header { padding-top: 28px; padding-bottom: 8px; }
h1 { font-size: 26px; margin: 0 0 4px; }
h2 { font-size: 17px; margin: 0 0 12px; }
h3 { font-size: 14px; margin: 18px 0 8px; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.sub, .hint { color: var(--muted); font-size: 14px; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 18px;
  margin: 16px 0;
}
.card.highlight { border-color: var(--accent); }
textarea, input {
  width: 100%;
  font: 13px/1.45 ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  background: var(--bg);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 8px 10px;
}
label { display: block; font-size: 13px; color: var(--muted); }
label input { margin-top: 4px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; margin-bottom: 10px; }
button {
  font: inherit;
  cursor: pointer;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  padding: 8px 14px;
}
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
button.link { border: none; background: none; color: var(--accent); padding: 2px 4px; text-decoration: underline; }
button:disabled { opacity: .5; cursor: default; }
.samples { font-size: 13px; color: var(--muted); margin-bottom: 8px; display: flex; flex-wrap: wrap; gap: 4px; align-items: center; }
.status { margin-left: 12px; color: var(--muted); font-size: 14px; }
.summary { font-size: 16px; font-weight: 600; margin: 0 0 12px; }
.metrics { display: flex; flex-wrap: wrap; gap: 18px; margin-bottom: 14px; }
.metric { min-width: 110px; }
.metric b { display: block; font-size: 20px; }
.metric span { color: var(--muted); font-size: 12px; }
pre {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 12px;
  overflow-x: auto;
  font: 12.5px/1.5 ui-monospace, Menlo, Consolas, monospace;
  margin: 0;
}
pre.wrap { white-space: pre-wrap; }
table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
th, td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 500; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
.json-head { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; }
.issue { padding: 8px 10px; border-left: 3px solid var(--line); margin-bottom: 8px; }
.issue.critical { border-color: var(--bad); }
.issue.major { border-color: var(--warn); }
.issue.info { border-color: var(--muted); }
.tree { font: 13px/1.6 ui-monospace, Menlo, Consolas, monospace; }
.tree .node { padding-left: 18px; border-left: 1px dotted var(--line); }
.tree .ok::before { content: "✓ "; color: var(--ok); }
.tree .error::before { content: "✗ "; color: var(--bad); }
.tree details summary { cursor: pointer; }
footer { padding: 20px 16px 40px; color: var(--muted); font-size: 12.5px; }
ul { padding-left: 18px; }
li { margin-bottom: 6px; }
svg { max-width: 100%; height: auto; }