:root {
  --bg: #0b0f14;
  --panel: #131a22;
  --panel-2: #1a232d;
  --border: #243140;
  --text: #d7e0ea;
  --muted: #8c9aa9;
  --accent: #46d39a;
  --accent-2: #3aa0ff;
  --warn: #e0b341;
  --error: #e0584b;
  --radius: 8px;
  --gap: 14px;
}

* { box-sizing: border-box; }

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

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}
.app-header h1 { font-size: 18px; margin: 0; font-weight: 600; }
.global-info { color: var(--muted); font-size: 13px; }

.codec-bar {
  margin: var(--gap) var(--gap) 0;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
}
.codec-bar .field { margin-bottom: 8px; }
.codec-note { color: var(--muted); font-size: 12px; font-style: italic; }

.panels {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
  padding: var(--gap);
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}
.panel h2 {
  margin: 0 0 14px;
  font-size: 15px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
}
.panel-rx h2 { color: var(--accent-2); }

.field {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
}
.field-label {
  width: 84px;
  flex: none;
  color: var(--muted);
  font-size: 13px;
}
.selector-slot { flex: 1; }

select, input[type="text"], input[type="number"] {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 8px;
  font: inherit;
}
select { width: 100%; }

.params-slot { margin: 0 0 10px; }
.param-panel {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 8px 10px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
}
.param-panel:empty { display: none; }
.param-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
}
.param-label { width: 90px; flex: none; color: var(--muted); }
.param-number { display: flex; align-items: center; gap: 8px; flex: 1; }
.param-number input[type="range"] { flex: 1; }
.param-number input[type="number"] { width: 72px; }
.param-unit { color: var(--muted); width: 30px; }
.param-bool { justify-content: flex-start; }
.param-none { color: var(--muted); font-size: 12px; font-style: italic; }

.view-mount { margin: 4px 0 12px; }
.data-text {
  width: 100%;
  min-height: 90px;
  resize: vertical;
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px;
  font: inherit;
}
.hex-input { min-height: 50px; font-family: ui-monospace, monospace; }
.hex-output {
  margin: 8px 0 0;
  max-height: 160px;
  overflow: auto;
  background: #0d141b;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px;
  font: 12px/1.4 ui-monospace, monospace;
  color: var(--accent);
  white-space: pre;
}
.image-view { display: flex; flex-direction: column; gap: 8px; align-items: flex-start; }
.image-canvas {
  image-rendering: pixelated;
  width: 160px; height: 160px;
  background: #0d141b;
  border: 1px solid var(--border);
  border-radius: 6px;
}
.image-label { color: var(--muted); font-size: 12px; }
.file-input { margin-top: 6px; color: var(--muted); font-size: 12px; }

/* Streaming image: square pixels by default — the picture keeps its true proportions
   and just grows taller as rows arrive. The .fit modifier stretches it into a square
   box instead (toggled by a button). */
.stream-canvas-wrap {
  width: 100%;             /* fill the column (the flex parent uses align-items:flex-start) */
  height: 400px;          /* initial window height; user-resizable via the drag handle */
  min-height: 120px;
  max-height: 90vh;       /* keep Stop reachable no matter how far it's dragged */
  resize: vertical;       /* native drag handle (bottom-right corner) */
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: 6px;
}
.stream-canvas {
  display: block;
  width: 100%;
  height: auto;
  image-rendering: pixelated;
  background: #0d141b;
}
/* Stretch into a square box that fills the current window height (no scroll in fit mode). */
.stream-canvas.fit { aspect-ratio: 1 / 1; height: 100%; width: auto; }

.actions { display: flex; gap: 10px; margin-top: 12px; }
.btn {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 16px;
  font: inherit;
  cursor: pointer;
}
.btn:hover { border-color: var(--accent); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: #07120d; border-color: var(--accent); font-weight: 600; }
.panel-rx .btn-primary { background: var(--accent-2); color: #04121f; border-color: var(--accent-2); }

.status-row { margin-top: 10px; color: var(--muted); font-size: 13px; }
.status-dot {
  display: inline-block; width: 10px; height: 10px; border-radius: 50%;
  background: #555; vertical-align: middle; margin: 0 4px;
}
.status-idle { background: #555; }
.status-searching { background: var(--warn); animation: pulse 1s infinite; }
.status-synced { background: var(--accent); }
@keyframes pulse { 50% { opacity: 0.3; } }

.viz, .log-section {
  margin: 0 var(--gap) var(--gap);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
}
.viz-head, .log-head {
  display: flex; justify-content: space-between; align-items: center;
  color: var(--muted); font-size: 13px; margin-bottom: 10px;
  text-transform: uppercase; letter-spacing: 0.05em;
}
.spec-controls { display: flex; gap: 18px; align-items: center; }
.spec-ctl {
  display: flex; align-items: center; gap: 8px;
  color: var(--muted); font-size: 12px;
  text-transform: none; letter-spacing: 0;
}
.spec-ctl output { color: var(--text); min-width: 56px; }
.viz figure { margin: 0; }
.viz figcaption { font-size: 12px; margin-bottom: 4px; }
.cap-tx { color: var(--accent); }
.cap-rx { color: var(--accent-2); }
.viz canvas {
  width: 100%; display: block;
  background: #000; border: 1px solid var(--border); border-radius: 6px;
}

/* Oscilloscopes: side by side, each half width. */
.scope-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--gap); }
.scope-row canvas { height: 140px; }

/* Spectrograms: side by side on one line, filling the width and tall enough to read.
   The "Freq span" slider controls the frequency span (vertical axis); "Speed" the
   horizontal scroll rate. Axes are label gutters around the heatmap canvas. */
.spec-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--gap); margin-top: var(--gap); }
.spec-plot {
  display: grid;
  grid-template-columns: 46px 1fr;
  grid-template-rows: 300px 18px;
  column-gap: 4px;
}
.spec-plot canvas { grid-area: 1 / 2; height: 300px; }
.spec-yaxis { grid-area: 1 / 1; position: relative; }
.spec-xaxis { grid-area: 2 / 2; position: relative; }
.axis-tick { position: absolute; font-size: 10px; color: var(--muted); white-space: nowrap; }
.spec-yaxis .axis-tick { right: 3px; }
.spec-yaxis .axis-tick::after {
  content: ''; position: absolute; right: -4px; top: 50%; width: 3px;
  border-top: 1px solid var(--border);
}

.log-body {
  height: 150px; overflow: auto;
  background: #0d141b; border: 1px solid var(--border); border-radius: 6px;
  padding: 8px; font: 12px/1.5 ui-monospace, monospace;
}
.log-line { white-space: pre-wrap; }
.log-ts { color: var(--muted); }
.log-info { color: var(--text); }
.log-ok { color: var(--accent); }
.log-warn { color: var(--warn); }
.log-error { color: var(--error); }

@media (max-width: 820px) {
  .panels { grid-template-columns: 1fr; }
  .scope-row { grid-template-columns: 1fr; }
}