:root {
  --bg: #f4f4f1;
  --surface: #ffffff;
  --surface-2: #fafaf8;
  --border: #dcdcd5;
  --border-strong: #c6c6be;
  --text: #17181a;
  --dim: #676c73;
  --accent: #1a4fd6;
  --ok: #1a7f43;
  --warn: #a45a06;
  --down: #b42318;
  --strip-bg: #17181a;
  --strip-text: #c9ccd1;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d0e10;
    --surface: #141619;
    --surface-2: #101215;
    --border: #262a30;
    --border-strong: #333941;
    --text: #e6e7e9;
    --dim: #8b919a;
    --accent: #6c9bff;
    --ok: #4ac07a;
    --warn: #d99031;
    --down: #e5695f;
    --strip-bg: #08090a;
    --strip-text: #9aa0a8;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.55;
  color: var(--text);
  background: var(--bg);
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { font-weight: 620; letter-spacing: -0.012em; margin: 0; }
h1 { font-size: 27px; line-height: 1.25; }
h2 { font-size: 17px; margin: 34px 0 12px; }
h3 { font-size: 14px; }
p { margin: 0 0 12px; }
code { font-family: var(--mono); font-size: 0.9em; }
.mono, .num { font-family: var(--mono); font-variant-numeric: tabular-nums; }
.dim { color: var(--dim); }

/* ---------- top strip: live node line ---------- */
.strip {
  background: var(--strip-bg);
  color: var(--strip-text);
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.01em;
  padding: 5px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}
.strip a { color: var(--strip-text); text-decoration: underline; text-underline-offset: 2px; }
.strip-in { display: flex; align-items: center; gap: 8px; min-width: 0; }
.strip span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ---------- header ---------- */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 20px;
  padding: 0 20px;
  height: 52px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.brand {
  display: flex; align-items: center; gap: 8px;
  font-size: 15px; font-weight: 600; letter-spacing: -0.02em;
  color: var(--text); text-decoration: none;
}
.brand:hover { text-decoration: none; }
.brand-dim { color: var(--dim); font-weight: 450; }
.mark {
  width: 15px; height: 15px; flex: none;
  background: var(--text);
  clip-path: polygon(50% 0, 100% 26%, 100% 74%, 50% 100%, 0 74%, 0 26%);
}
.nav { display: flex; align-items: center; gap: 20px; font-size: 13.5px; }
.nav a { color: var(--dim); }
.nav a:hover { color: var(--text); text-decoration: none; }
.nav a.on { color: var(--text); }
.nav a.act {
  color: var(--text);
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  padding: 4px 11px;
  background: var(--surface-2);
}

/* ---------- layout ---------- */
.page { max-width: 1000px; margin: 0 auto; padding: 30px 20px 60px; }
.wide { max-width: 1100px; }
.lead { color: var(--dim); max-width: 62ch; margin-bottom: 22px; }
.crumbs { font-family: var(--mono); font-size: 12px; color: var(--dim); margin-bottom: 10px; }
.crumbs a { color: var(--dim); }

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 400px;
  gap: 34px;
  align-items: start;
}
@media (max-width: 880px) {
  .split { grid-template-columns: 1fr; gap: 24px; }
  .nav .opt { display: none; }
}

/* ---------- panel ---------- */
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 5px;
  overflow: hidden;
}
.panel-head {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 9px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-2);
  font-family: var(--mono);
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--dim);
}
.panel-body { padding: 14px; }
.panel-foot {
  padding: 8px 14px;
  border-top: 1px solid var(--border);
  background: var(--surface-2);
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--dim);
}

/* ---------- metric rows ---------- */
.kv { display: grid; grid-template-columns: 1fr auto; gap: 4px 12px; }
.kv > div { padding: 7px 0; border-bottom: 1px dashed var(--border); font-size: 13.5px; }
.kv > div:nth-last-child(-n+2) { border-bottom: none; }
.kv .k { color: var(--dim); }
.kv .v { font-family: var(--mono); font-variant-numeric: tabular-nums; text-align: right; }

.tiles { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.tiles > div {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 12px 14px;
}
@media (max-width: 880px) { .tiles { grid-template-columns: 1fr 1fr; } }
.tiles .k {
  font-family: var(--mono); font-size: 11px; text-transform: uppercase;
  letter-spacing: 0.06em; color: var(--dim);
}
.tiles .v {
  font-family: var(--mono); font-size: 21px; font-variant-numeric: tabular-nums;
  margin-top: 3px; letter-spacing: -0.02em;
}
.tiles .s { font-size: 11.5px; color: var(--dim); margin-top: 2px; }

/* ---------- tables ---------- */
table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
th, td { text-align: left; padding: 8px 14px; border-bottom: 1px solid var(--border); }
thead th {
  font-family: var(--mono); font-size: 11px; font-weight: 500;
  text-transform: uppercase; letter-spacing: 0.06em; color: var(--dim);
  background: var(--surface-2);
}
tbody tr:last-child td { border-bottom: none; }
td.num, th.num { text-align: right; font-family: var(--mono); font-variant-numeric: tabular-nums; }
.scroll { overflow-x: auto; }

/* ---------- code ---------- */
.code pre {
  margin: 0; padding: 14px; overflow-x: auto;
  font-family: var(--mono); font-size: 12.5px; line-height: 1.65;
  background: var(--surface);
}
.code .c { color: var(--dim); }
.tabs { display: flex; gap: 0; }
.tabs button {
  font: inherit; font-size: 12px; font-family: var(--mono);
  background: none; border: none; border-right: 1px solid var(--border);
  color: var(--dim); padding: 8px 13px; cursor: pointer;
}
.tabs button[aria-selected="true"] { color: var(--text); background: var(--surface); }
.copy {
  font: inherit; font-size: 11px; font-family: var(--mono);
  background: none; border: 1px solid var(--border); border-radius: 3px;
  color: var(--dim); padding: 2px 8px; cursor: pointer;
}
.copy:hover { color: var(--text); }

/* ---------- status bits ---------- */
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--ok); flex: none; }
.dot.warn { background: var(--warn); }
.dot.down { background: var(--down); }
.state { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; }
.chart { display: block; width: 100%; height: 90px; }
.chart-legend {
  display: flex; gap: 16px; font-family: var(--mono); font-size: 11.5px; color: var(--dim);
  padding: 0 14px 12px;
}
.chart-legend i { display: inline-block; width: 10px; height: 2px; vertical-align: middle; margin-right: 5px; }

/* ---------- buttons and forms ---------- */
.btn {
  display: inline-block; font-size: 13.5px; font-weight: 500;
  padding: 7px 14px; border-radius: 4px; cursor: pointer;
  border: 1px solid var(--accent); background: var(--accent); color: #fff;
}
.btn:hover { text-decoration: none; filter: brightness(1.08); }
.btn.sec { background: var(--surface); color: var(--text); border-color: var(--border-strong); }
.btns { display: flex; gap: 8px; flex-wrap: wrap; margin: 18px 0 8px; }

form label { display: block; font-size: 12.5px; color: var(--dim); margin-bottom: 12px; }
form label span { display: block; margin-bottom: 5px; }
input[type="email"], input[type="password"], input[type="text"] {
  width: 100%; padding: 8px 10px; font: inherit; font-size: 14px;
  border: 1px solid var(--border-strong); border-radius: 4px;
  background: var(--surface-2); color: var(--text);
}
input:focus { outline: 2px solid var(--accent); outline-offset: -1px; border-color: var(--accent); }
form button[type="submit"], button.wide-btn {
  width: 100%; font: inherit; font-size: 14px; font-weight: 500;
  padding: 9px 14px; border-radius: 4px; cursor: pointer;
  border: 1px solid var(--accent); background: var(--accent); color: #fff;
}
button.wide-btn.sec { background: var(--surface); color: var(--text); border-color: var(--border-strong); }
form button[disabled] { opacity: 0.6; cursor: not-allowed; }
.formrow { display: flex; justify-content: space-between; align-items: center; font-size: 12.5px; margin: -2px 0 14px; }
.check { display: flex; align-items: center; gap: 7px; color: var(--dim); margin: 0; }
.check input { margin: 0; }
.msg { min-height: 17px; font-size: 12.5px; color: var(--down); margin: 9px 0 0; }
.msg.ok { color: var(--ok); }
.sep { display: flex; align-items: center; gap: 10px; color: var(--dim); font-size: 11.5px; margin: 14px 0; }
.sep::before, .sep::after { content: ""; flex: 1; height: 1px; background: var(--border); }
.narrow { max-width: 380px; margin: 44px auto; padding: 0 20px; }
.note { font-size: 12.5px; color: var(--dim); margin-top: 14px; }

/* ---------- feature list ---------- */
.cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px 30px; }
@media (max-width: 880px) { .cols { grid-template-columns: 1fr; gap: 18px; } }
.cols h3 { margin-bottom: 4px; }
.cols p { font-size: 13.5px; color: var(--dim); margin: 0; }

/* ---------- footer ---------- */
footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
  margin-top: 50px;
}
.footin {
  max-width: 1000px; margin: 0 auto; padding: 26px 20px;
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 22px;
  font-size: 13px;
}
@media (max-width: 880px) { .footin { grid-template-columns: 1fr 1fr; } }
.footin strong { display: block; font-size: 11px; font-family: var(--mono); text-transform: uppercase; letter-spacing: 0.06em; color: var(--dim); font-weight: 500; margin-bottom: 7px; }
.footin a { display: block; color: var(--text); margin-bottom: 4px; }
.footin p { color: var(--dim); font-size: 12.5px; }
.colophon {
  border-top: 1px solid var(--border);
  font-family: var(--mono); font-size: 11.5px; color: var(--dim);
  padding: 10px 20px; text-align: center;
}