:root {
  --bg: #f6f7f9; --panel: #ffffff; --text: #111827; --muted: #6b7280;
  --border: #e5e7eb; --accent: #2563eb;
  --ok: #15803d; --ok-bg: #dcfce7; --fail: #b91c1c; --fail-bg: #fee2e2;
  --warn: #b45309; --warn-bg: #fef3c7;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0f17; --panel: #131a24; --text: #e5e7eb; --muted: #9ca3af;
    --border: #263141; --accent: #60a5fa;
    --ok: #4ade80; --ok-bg: #06331d; --fail: #f87171; --fail-bg: #3a0f0f;
    --warn: #fbbf24; --warn-bg: #3a2c05;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 15px/1.5 system-ui, "Segoe UI", Roboto, Arial, sans-serif;
}
header {
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px;
  padding: 16px 22px; border-bottom: 1px solid var(--border); background: var(--panel);
}
header h1 { font-size: 20px; margin: 0; }
.controls { display: flex; align-items: center; gap: 14px; }
#clock { color: var(--muted); font-variant-numeric: tabular-nums; }
button {
  background: var(--accent); color: #fff; border: 0; border-radius: 8px;
  padding: 8px 14px; font-size: 14px; cursor: pointer;
}
button:disabled { opacity: .5; cursor: default; }
.link-btn { color: var(--accent); text-decoration: none; font-size: 14px; border: 1px solid var(--border); padding: 7px 12px; border-radius: 8px; }
main { max-width: 1000px; margin: 0 auto; padding: 22px; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
.card {
  background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 16px;
}
.card .name { font-weight: 600; font-size: 17px; }
.card .host { color: var(--muted); font-size: 13px; }
.badge {
  display: inline-block; padding: 3px 10px; border-radius: 999px; font-size: 13px; font-weight: 600; margin: 10px 0;
}
.badge.ok { color: var(--ok); background: var(--ok-bg); }
.badge.fail { color: var(--fail); background: var(--fail-bg); }
.badge.warn, .badge.unreach { color: var(--warn); background: var(--warn-bg); }
.method { text-transform: uppercase; font-size: 11px; letter-spacing: .04em; opacity: .8; }
.kv { display: flex; flex-wrap: wrap; gap: 6px 16px; font-size: 14px; margin-top: 6px; }
.kv b { font-variant-numeric: tabular-nums; }
.issues { color: var(--warn); font-size: 13px; margin-top: 8px; }
.note { color: var(--muted); font-size: 13px; margin-top: 6px; }
.ts { color: var(--muted); font-size: 12.5px; margin-top: 10px; padding-top: 8px; border-top: 1px solid var(--border); font-variant-numeric: tabular-nums; }
#clock { font-weight: 600; }
.panel {
  background: var(--panel); border: 1px solid var(--border); border-radius: 12px;
  padding: 16px; margin-top: 22px;
}
.panel h2 { font-size: 15px; margin: 0 0 12px; }
.panel-head { display: flex; justify-content: space-between; align-items: center; }
select {
  background: var(--bg); color: var(--text); border: 1px solid var(--border);
  border-radius: 8px; padding: 6px 10px;
}
.matrix { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: 13.5px; }
th, td { padding: 6px 10px; text-align: left; border-bottom: 1px solid var(--border); white-space: nowrap; }
th { color: var(--muted); font-weight: 600; }
.dot { display: inline-block; width: 9px; height: 9px; border-radius: 50%; }
.dot.ok { background: var(--ok); } .dot.fail { background: var(--fail); } .dot.warn { background: var(--warn); }
.cell-ok { color: var(--ok); } .cell-fail { color: var(--muted); }
td .c-ok { color: var(--ok); font-weight: 700; }
td .c-exc { color: var(--accent); font-weight: 700; }
td .c-crc { color: var(--warn); font-weight: 700; }
td .c-to { color: var(--muted); }
td .c0 { color: var(--muted); opacity: .45; }
footer { max-width: 1000px; margin: 0 auto; padding: 16px 22px; color: var(--muted); font-size: 13px; }