:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --text: #16181d;
  --muted: #5f6672;
  --line: #e2e5ea;
  --accent: #2f6fed;
  --accent-text: #ffffff;
  --ok: #1f8a4c;
  --warn: #b26a00;
  --err: #c62f3a;
  --code: #eef1f5;
  --radius: 12px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1115;
    --card: #181b21;
    --text: #e8eaee;
    --muted: #9aa2ae;
    --line: #2a2f38;
    --accent: #5b8ff9;
    --code: #222731;
  }
}
:root[data-theme="dark"] {
  --bg: #0f1115;
  --card: #181b21;
  --text: #e8eaee;
  --muted: #9aa2ae;
  --line: #2a2f38;
  --accent: #5b8ff9;
  --code: #222731;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
a { color: var(--accent); }
header.top {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  max-width: 880px; margin: 0 auto; padding: 16px;
}
header.top { flex-wrap: wrap; }
header.top .brand { font-weight: 700; font-size: 17px; text-decoration: none; color: var(--text); white-space: nowrap; }
header.top nav { display: flex; gap: 14px; flex-wrap: wrap; font-size: 14px; }
header.top nav a { text-decoration: none; color: var(--muted); white-space: nowrap; }
header.top nav a.on { color: var(--text); font-weight: 600; }
main { max-width: 880px; margin: 0 auto; padding: 0 16px 48px; }
main.narrow { max-width: 560px; }
h1 { font-size: 24px; margin: 8px 0 4px; }
h2 { font-size: 18px; margin: 28px 0 8px; }
p.sub { color: var(--muted); margin: 0 0 20px; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px; margin-bottom: 16px;
}
label { display: block; font-weight: 600; margin: 12px 0 6px; font-size: 14px; }
input, select, textarea {
  width: 100%; padding: 10px 12px; font: inherit; color: var(--text);
  background: var(--bg); border: 1px solid var(--line); border-radius: 8px;
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
button {
  font: inherit; font-weight: 600; cursor: pointer; border-radius: 8px; padding: 10px 16px;
  border: 1px solid var(--accent); background: var(--accent); color: var(--accent-text);
}
button.ghost { background: transparent; color: var(--text); border-color: var(--line); }
button:disabled { opacity: .6; cursor: default; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: end; }
.row > * { flex: 1 1 160px; }
.seg { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-bottom: 4px; }
.seg button { background: transparent; color: var(--text); border-color: var(--line); }
.seg button.on { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
.full { width: 100%; margin-top: 16px; }
.msg { margin-top: 14px; padding: 10px 12px; border-radius: 8px; display: none; }
.msg.show { display: block; }
.msg.err { background: color-mix(in srgb, var(--err) 12%, transparent); color: var(--err); }
.msg.ok { background: color-mix(in srgb, var(--ok) 12%, transparent); color: var(--ok); }
.msg.warn { background: color-mix(in srgb, var(--warn) 14%, transparent); color: var(--warn); }
.keybox {
  display: flex; gap: 8px; align-items: center; margin: 10px 0;
  background: var(--code); border-radius: 8px; padding: 10px 12px;
}
.keybox code { flex: 1; word-break: break-all; font-size: 14px; }
.keybox button { padding: 6px 12px; flex: none; }
code, pre { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
pre {
  background: var(--code); border-radius: 8px; padding: 12px; overflow-x: auto;
  font-size: 13px; margin: 8px 0;
}
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; }
.stat { background: var(--bg); border: 1px solid var(--line); border-radius: 10px; padding: 12px; }
.stat .k { color: var(--muted); font-size: 13px; }
.stat .v { font-size: 20px; font-weight: 700; margin-top: 2px; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 8px 6px; border-bottom: 1px solid var(--line); white-space: nowrap; }
th { color: var(--muted); font-weight: 600; }
.pill { display: inline-block; padding: 2px 8px; border-radius: 99px; font-size: 12px; background: var(--code); }
.pill.ok { color: var(--ok); }
.pill.err { color: var(--err); }
.muted { color: var(--muted); }
.hidden { display: none !important; }
ol.steps { padding-left: 20px; }
ol.steps li { margin: 6px 0; }
footer { text-align: center; color: var(--muted); font-size: 12px; padding: 24px 16px; }