:root {
  --bg: #f6f7f9; --card: #fff; --fg: #1b1f24; --muted: #667085; --line: #e4e7ec;
  --accent: #2563eb; --ok: #12805c; --bad: #b42318; --code-bg: #0f1115; --code-fg: #d7dde5;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115; --card: #181b21; --fg: #e6e8eb; --muted: #98a2b3; --line: #2a2f37;
    --accent: #6ea8ff; --ok: #47cd89; --bad: #f97066; --code-bg: #0b0d10; --code-fg: #d7dde5;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.5 system-ui, -apple-system, sans-serif; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

nav.top { border-bottom: 1px solid var(--line); background: var(--card); }
nav.top .in { max-width: 860px; margin: 0 auto; padding: 10px 16px; display: flex; gap: 18px; align-items: center; flex-wrap: wrap; }
nav.top .brand { font-weight: 650; color: var(--fg); margin-right: auto; }
nav.top a.on { color: var(--fg); font-weight: 600; }

main { max-width: 860px; margin: 0 auto; padding: 32px 16px 48px; }
h1 { font-size: 1.4rem; margin: 0 0 6px; }
.sub { color: var(--muted); margin: 0 0 24px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 16px 18px; margin-bottom: 12px; }
.label { color: var(--muted); font-size: .8rem; text-transform: uppercase; letter-spacing: .04em; }
.row { display: flex; align-items: center; gap: 12px; justify-content: space-between; flex-wrap: wrap; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 12px; }
.mono, .ip { font-family: ui-monospace, Menlo, monospace; }
.ip { font-size: 1.2rem; word-break: break-all; }
.ok { color: var(--ok); } .bad { color: var(--bad); } .muted { color: var(--muted); }

dl.kv { display: grid; grid-template-columns: max-content 1fr; gap: 6px 16px; margin: 8px 0 0; }
dl.kv dt { color: var(--muted); }
dl.kv dd { margin: 0; font-family: ui-monospace, Menlo, monospace; word-break: break-all; }

button, input, select { font: inherit; font-size: .95rem; padding: 7px 10px; border-radius: 7px; border: 1px solid var(--line); background: var(--card); color: var(--fg); }
button { cursor: pointer; }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button:disabled { opacity: .5; cursor: default; }
form.inline { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; margin-top: 8px; }
form.inline input[type=text] { flex: 1 1 220px; min-width: 0; }

pre.out { background: var(--code-bg); color: var(--code-fg); border-radius: 10px; padding: 14px 16px; overflow-x: auto; min-height: 120px; font: 13px/1.45 ui-monospace, Menlo, monospace; margin: 12px 0 0; white-space: pre; }
details summary { cursor: pointer; color: var(--muted); }
code { font-family: ui-monospace, Menlo, monospace; font-size: .9em; }
footer { color: var(--muted); font-size: .85rem; margin-top: 32px; }