:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --text: #1c2330;
  --muted: #667085;
  --border: #e3e6eb;
  --accent: #2f5bea;
  --accent-text: #ffffff;
  --danger: #c4320a;
  --ok: #067647;
  --code-bg: #f2f4f7;
  --radius: 10px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151b;
    --surface: #1a1f27;
    --text: #e6e9ef;
    --muted: #98a2b3;
    --border: #2b323d;
    --accent: #6d8dff;
    --accent-text: #0d1117;
    --danger: #ff8a65;
    --ok: #4ade80;
    --code-bg: #222934;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
header {
  display: flex; align-items: center; gap: 24px; flex-wrap: wrap;
  padding: 12px 24px; background: var(--surface); border-bottom: 1px solid var(--border);
}
header .brand { font-weight: 650; }
header nav a { color: var(--muted); text-decoration: none; margin-right: 16px; }
header nav a.active { color: var(--text); font-weight: 600; }
header .who { margin-left: auto; color: var(--muted); font-size: 13px; display: flex; gap: 8px; align-items: center; }
main { max-width: 1100px; margin: 24px auto; padding: 0 16px; }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; margin-bottom: 16px;
}
h1 { font-size: 22px; margin: 0 0 4px; }
h2 { font-size: 18px; margin: 20px 0 8px; }
.card > h2:first-child { margin-top: 0; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.row { display: flex; gap: 12px; flex-wrap: wrap; align-items: end; }
.row > label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted); }
input[type=text], input[type=password], input[type=date], select, textarea {
  font: inherit; color: var(--text); background: var(--surface);
  border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px;
}
textarea { width: 100%; min-height: 220px; font-family: ui-monospace, Consolas, monospace; font-size: 13px; resize: vertical; }
button {
  font: inherit; border: 1px solid var(--border); background: var(--surface); color: var(--text);
  border-radius: 8px; padding: 8px 14px; cursor: pointer;
}
button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); font-weight: 600; }
button:disabled { opacity: .55; cursor: progress; }
.seg { display: inline-flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.seg label { padding: 8px 14px; cursor: pointer; color: var(--text); font-size: 14px; }
.seg input { display: none; }
.seg label:has(input:checked) { background: var(--accent); color: var(--accent-text); }
.badge { display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: 12px; border: 1px solid var(--border); color: var(--muted); }
.badge.ok { color: var(--ok); border-color: currentColor; }
.error { color: var(--danger); white-space: pre-wrap; }
.meta { display: flex; gap: 16px; flex-wrap: wrap; font-size: 13px; color: var(--muted); margin-bottom: 12px; }
.meta b { color: var(--text); font-weight: 600; }
.result h2 { font-size: 16px; border-top: 1px solid var(--border); padding-top: 14px; }
.result h2:first-child { border-top: 0; padding-top: 0; margin-top: 0; }
.result code { background: var(--code-bg); padding: 1px 5px; border-radius: 4px; font-size: 13px; }
.result pre { background: var(--code-bg); padding: 10px; border-radius: 8px; overflow-x: auto; }
.result pre code { padding: 0; }
.table-wrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: 14px; }
th, td { text-align: left; padding: 7px 10px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { color: var(--muted); font-weight: 600; font-size: 13px; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
tfoot td { font-weight: 650; }
.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; margin-bottom: 16px; }
.tile { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 16px; }
.tile .v { font-size: 22px; font-weight: 650; font-variant-numeric: tabular-nums; }
.tile .l { font-size: 13px; color: var(--muted); }
.feedback { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-top: 16px; padding-top: 12px; border-top: 1px solid var(--border); }
.feedback input[type=text] { flex: 1; min-width: 200px; }
.hidden { display: none !important; }
@media (max-width: 640px) {
  header { padding: 10px 16px; gap: 12px; }
  .card { padding: 14px; }
}