:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --border: #dfe3e8;
  --text: #1c2530;
  --muted: #63707f;
  --accent: #1f6feb;
  --ok: #1a7f52;
  --warn: #b26a00;
  --bad: #c0392b;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12161c;
    --surface: #1a1f27;
    --border: #2c333d;
    --text: #e6eaf0;
    --muted: #9aa7b5;
    --accent: #58a6ff;
    --ok: #3fb950;
    --warn: #d29922;
    --bad: #f85149;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}

/* Top bar ---------------------------------------------------------------- */
.topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand { display: flex; align-items: center; gap: 10px; }
.brand h1 { font-size: 16px; margin: 0; font-weight: 650; }

.scenario {
  font-size: 12px;
  color: var(--muted);
  padding: 2px 8px;
  border: 1px solid var(--border);
  border-radius: 999px;
}

.dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--muted);
  flex: 0 0 auto;
}
.dot.ok { background: var(--ok); }
.dot.warn { background: var(--warn); }
.dot.bad { background: var(--bad); }

.tabs { display: flex; gap: 4px; }
.tab {
  background: none;
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 6px 12px;
  font: inherit;
  color: var(--muted);
  cursor: pointer;
}
.tab:hover { color: var(--text); }
.tab.active {
  color: var(--text);
  background: var(--bg);
  border-color: var(--border);
  font-weight: 600;
}

main { padding: 20px; max-width: 1200px; margin: 0 auto; }
.panel { display: none; }
.panel.active { display: block; }

h2 { font-size: 14px; margin: 24px 0 8px; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); }
.hint { color: var(--muted); font-size: 13px; margin: 0 0 12px; max-width: 70ch; }

/* Cards ------------------------------------------------------------------ */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 12px; }
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
}
.card .value { font-size: 22px; font-weight: 650; font-variant-numeric: tabular-nums; }
.card .label { font-size: 12px; color: var(--muted); }

/* Components ------------------------------------------------------------- */
.components { display: flex; flex-direction: column; gap: 6px; }
.component {
  display: grid;
  grid-template-columns: 14px 150px 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
}
.component .name { font-weight: 600; font-family: var(--mono); font-size: 13px; }
.component .desc { color: var(--muted); font-size: 13px; }
.component .state { font-family: var(--mono); font-size: 12px; }
.component .state.ok { color: var(--ok); }
.component .state.bad { color: var(--bad); }
.component .detail { grid-column: 3 / -1; color: var(--warn); font-size: 12px; }

.detail {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  font-size: 13px;
}
.detail dl { display: grid; grid-template-columns: max-content 1fr; gap: 4px 16px; margin: 0; }
.detail dt { color: var(--muted); }
.detail dd { margin: 0; font-family: var(--mono); }

/* Controls --------------------------------------------------------------- */
.controls { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; margin-bottom: 14px; }
.controls label { display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--muted); }
select, input[type="text"] {
  font: inherit;
  padding: 5px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  color: var(--text);
}

/* Traces ----------------------------------------------------------------- */
.trace {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 12px;
  margin-bottom: 8px;
}
.trace-head {
  display: flex; justify-content: space-between; align-items: baseline;
  font-family: var(--mono); font-size: 12px; margin-bottom: 4px;
}
.trace-head .meta { color: var(--muted); }
.trace svg { display: block; width: 100%; height: 70px; }
.trace svg path { fill: none; stroke: var(--accent); stroke-width: 1; vector-effect: non-scaling-stroke; }
.trace svg rect.gap { fill: var(--bad); opacity: .15; }

/* Tables ----------------------------------------------------------------- */
.table-scroll { overflow-x: auto; border: 1px solid var(--border); border-radius: 8px; background: var(--surface); }
table { border-collapse: collapse; width: 100%; font-size: 13px; }
th, td { text-align: left; padding: 8px 12px; border-bottom: 1px solid var(--border); white-space: nowrap; }
th { color: var(--muted); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: .03em; }
tbody tr:last-child td { border-bottom: none; }
td.num { font-family: var(--mono); font-variant-numeric: tabular-nums; text-align: right; }

/* Configuration ---------------------------------------------------------- */
.config-group {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 12px;
  overflow: hidden;
}
.config-group > summary {
  cursor: pointer;
  padding: 12px 14px;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  gap: 12px;
}
.config-group > summary .file { font-family: var(--mono); font-size: 12px; color: var(--muted); font-weight: 400; }
.param {
  display: grid;
  grid-template-columns: minmax(200px, 1fr) minmax(160px, 220px);
  gap: 10px 16px;
  padding: 10px 14px;
  border-top: 1px solid var(--border);
  align-items: start;
}
.param.locked { opacity: .6; }
.param .pname { font-weight: 600; font-size: 13px; }
.param .pkey { font-family: var(--mono); font-size: 11px; color: var(--muted); }
.param .pnote { font-size: 12px; color: var(--muted); margin-top: 2px; max-width: 60ch; }
.param input, .param select { width: 100%; font-family: var(--mono); font-size: 13px; }
.param input.changed { border-color: var(--accent); box-shadow: 0 0 0 2px rgb(31 111 235 / .15); }
.param .lock { font-size: 11px; color: var(--muted); font-style: italic; }
.param .range { font-size: 11px; color: var(--muted); margin-top: 4px; font-family: var(--mono); }

/* Apply bar -------------------------------------------------------------- */
.apply-bar {
  position: sticky;
  bottom: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 12px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 -2px 12px rgb(0 0 0 / .08);
  margin-top: 16px;
}
.apply-summary { font-size: 13px; }
.apply-actions { display: flex; gap: 8px; }
button.primary, button.secondary {
  font: inherit; padding: 7px 14px; border-radius: 6px; cursor: pointer; border: 1px solid var(--border);
}
button.primary { background: var(--accent); color: #fff; border-color: transparent; font-weight: 600; }
button.primary:disabled { opacity: .5; cursor: default; }
button.secondary { background: var(--surface); color: var(--text); }

.result { margin-top: 14px; padding: 12px 14px; border-radius: 8px; border: 1px solid var(--border); background: var(--surface); font-size: 13px; }
.result.ok { border-color: var(--ok); }
.result.bad { border-color: var(--bad); }
.result h3 { margin: 0 0 8px; font-size: 13px; }
.result ul { margin: 4px 0 0; padding-left: 20px; }
.result code { font-family: var(--mono); font-size: 12px; }

.empty { color: var(--muted); padding: 24px; text-align: center; }

/* Pick overlay ------------------------------------------------------------ */
/* P and S are distinguished by hue and by the letter, not by hue alone, so the
   overlay still reads for a colour-blind viewer. */
.pick { stroke-width: 1.2; opacity: 0.9; }
.pick-p { stroke: #2f7bd6; }
.pick-s { stroke: #d1651c; stroke-dasharray: 4 3; }
.pick-p-label,
.pick-s-label { font-size: 10px; font-weight: 600; }
.pick-p-label { fill: #2f7bd6; }
.pick-s-label { fill: #d1651c; }

.controls label.check {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-weight: 500;
}
.controls label.check input { margin: 0; }