:root {
  --bg: #0e1319;
  --panel: #151c24;
  --panel2: #1b2430;
  --border: #263241;
  --text: #dbe4ee;
  --muted: #8593a3;
  --accent: #3ddc84;
  --accent-ink: #062014;
  --c1: #ff5a5a;
  --c2: #4ea8ff;
  --warn: #ffd23f;
  --bad: #ff5a5a;
  --radius: 8px;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

button, select, input { font: inherit; color: inherit; }

button {
  background: var(--panel2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 12px;
  cursor: pointer;
}
button:hover:not(:disabled) { border-color: #3a4a5e; background: #212c39; }
button:disabled { opacity: 0.45; cursor: default; }
button.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 600; }
button.primary:hover:not(:disabled) { background: #5ee69c; }
button.danger { border-color: #6b2b2b; color: #ffb3b3; }

select {
  background: var(--panel2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 6px;
}
select:disabled { opacity: 0.45; }

.muted { color: var(--muted); }

/* ---- top bar ---- */
.topbar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
  flex-wrap: wrap;
}
.brand { font-weight: 700; font-size: 17px; letter-spacing: 0.2px; }
.brand span { font-weight: 400; color: var(--muted); }
.conn { display: flex; gap: 8px; }
.chips { display: flex; gap: 6px; flex-wrap: wrap; margin-left: auto; }
.chip {
  font-size: 12px;
  padding: 2px 9px;
  border-radius: 99px;
  border: 1px solid var(--border);
  background: var(--panel2);
}
.chip.on { border-color: #2f7a53; color: var(--accent); }
.chip.off { color: var(--muted); }
.chip.warn { border-color: #7a6a24; color: var(--warn); }
.chip.bad { border-color: #7a2f2f; color: var(--bad); }

.banner {
  margin: 10px 16px 0;
  padding: 8px 12px;
  border: 1px solid #7a6a24;
  background: #2a2510;
  color: #f4e3a1;
  border-radius: var(--radius);
}

/* ---- mode tabs ---- */
.modes { display: flex; gap: 4px; padding: 10px 16px 0; }
.modes button {
  border-radius: 6px 6px 0 0;
  border-bottom: none;
  padding: 7px 18px;
  background: transparent;
  color: var(--muted);
}
.modes button.active { background: var(--panel); color: var(--text); border-color: var(--border); }

/* ---- layout ---- */
main {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 290px;
  gap: 0;
  align-items: start;
}
.workspace { padding: 0 16px 16px; min-width: 0; }
.view { background: var(--panel); border: 1px solid var(--border); border-radius: 0 var(--radius) var(--radius) var(--radius); padding: 12px; }
.view.welcome { border-radius: var(--radius); margin-top: 16px; padding: 24px 28px; max-width: 720px; }
.welcome h1 { margin: 0 0 12px; font-size: 22px; }
.welcome li { margin: 4px 0; }

.sidebar {
  padding: 10px 16px 16px 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.sidebar section { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 12px; }
.sidebar h2 { margin: 0 0 8px; font-size: 13px; text-transform: uppercase; letter-spacing: 0.6px; color: var(--muted); }
.settings { display: grid; grid-template-columns: auto 1fr; gap: 6px 10px; align-items: center; }
.settings label { color: var(--muted); font-size: 13px; }
.settings select { width: 100%; }
.settings .hidden { display: none; }
#device-info { font-size: 12px; margin-bottom: 10px; white-space: pre-line; }

@media (max-width: 900px) {
  main { grid-template-columns: 1fr; }
  .sidebar { padding: 0 16px 16px; }
}

/* ---- toolbar ---- */
.toolbar { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-bottom: 10px; align-items: center; }
.toolbar .group { display: flex; gap: 6px; align-items: center; }
.toggle { display: inline-flex; gap: 5px; align-items: center; cursor: pointer; user-select: none; }
.toggle input { accent-color: var(--accent); }
button.active-toggle { border-color: var(--warn); color: var(--warn); }

/* ---- plots ---- */
.plots { display: grid; gap: 8px; }
.plot { position: relative; background: #0b0f14; border: 1px solid var(--border); border-radius: 6px; overflow: hidden; }
.plot canvas { display: block; width: 100%; height: 100%; touch-action: none; }
.plot.main { height: min(56vh, 520px); min-height: 280px; }
.plot.fft { height: 240px; }
.plot.strip { height: 220px; margin-top: 8px; }
.badge {
  position: absolute;
  right: 10px;
  top: 8px;
  font: 12px ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color: var(--muted);
  pointer-events: none;
  text-align: right;
}
.hint { margin: 6px 0 0; font-size: 12px; color: var(--muted); }

/* ---- readouts ---- */
.readouts { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 10px; align-items: flex-start; }
table { border-collapse: collapse; font: 13px ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
th, td { padding: 4px 9px; text-align: right; border-bottom: 1px solid var(--border); white-space: nowrap; }
thead th { color: var(--muted); font-weight: 500; }
tr.c1 th { color: var(--c1); }
tr.c2 th { color: var(--c2); }
#tbl-meas { overflow-x: auto; display: block; max-width: 100%; }
.cursor-read {
  font: 13px ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  padding: 6px 10px;
  border: 1px solid #2f7a53;
  border-radius: 6px;
  white-space: pre;
}

/* ---- panels ---- */
.panel { margin-top: 12px; border: 1px solid var(--border); border-radius: 6px; padding: 8px 12px; background: var(--panel2); }
.panel summary { cursor: pointer; font-weight: 600; }
.panel[open] summary { margin-bottom: 8px; }
.panel p { margin: 6px 0 0; font-size: 12px; }
.row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin: 8px 0; }
progress { width: 100%; accent-color: var(--accent); }

/* ---- meters ---- */
.cards { display: flex; flex-wrap: wrap; gap: 12px; }
.card { flex: 1 1 260px; background: var(--panel2); border: 1px solid var(--border); border-radius: var(--radius); padding: 12px 16px; }
.card h3 { margin: 0; font-size: 14px; }
.card.c1 h3 { color: var(--c1); }
.card.c2 h3 { color: var(--c2); }
.big { font: 600 44px/1.15 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; margin: 6px 0; }
.big.bad { color: var(--bad); }
.big.good { color: var(--accent); }
.minmax { color: var(--muted); font: 13px ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; min-height: 1.4em; }
.history { margin-top: 10px; }

/* ---- footer ---- */
.footer { padding: 6px 16px 12px; font-size: 12px; color: var(--muted); min-height: 1.5em; }
.footer.error { color: var(--bad); }