:root {
  --bg: #0b1220;
  --panel: #0f1b32;
  --border: rgba(255,255,255,.08);
  --text: rgba(255,255,255,.9);
  --muted: rgba(255,255,255,.55);
  --accent2: #22d3ee;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
}

*, *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  font-family: var(--sans);
  color: var(--text);
  background: var(--bg);
  overflow-x: hidden;
}

.app {
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* Toolbar: sliders + controls in one row */
.toolbar {
  display: flex;
  gap: 10px;
  align-items: flex-end;
}

.sliders {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px 10px;
}

.slider {
  display: flex;
  align-items: center;
  gap: 6px;
}

.slider .label {
  font-size: 11px;
  font-weight: 650;
  color: var(--muted);
  min-width: 46px;
}

.slider input[type="range"] {
  flex: 1;
  min-width: 0;
  accent-color: var(--accent2);
}

.slider .value {
  font-size: 11px;
  color: var(--muted);
  font-family: var(--mono);
  min-width: 22px;
  text-align: right;
}

.controls {
  display: flex;
  align-items: flex-end;
  gap: 6px;
  flex-shrink: 0;
}

.speed {
  display: flex;
  align-items: center;
  gap: 4px;
}

.speed .label {
  font-size: 11px;
  color: var(--muted);
  font-weight: 600;
}

.speed input[type="range"] {
  width: 60px;
  accent-color: var(--accent2);
}

.btn {
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(255,255,255,.06);
  color: rgba(255,255,255,.85);
  padding: 6px 10px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 700;
  font-size: 12px;
  letter-spacing: .01em;
  transition: background .12s ease;
  user-select: none;
  white-space: nowrap;
}
.btn:hover { background: rgba(255,255,255,.09); }
.btn.primary {
  background: linear-gradient(135deg, rgba(124,58,237,.9), rgba(34,211,238,.7));
  border-color: rgba(255,255,255,.18);
}
.btn.danger {
  background: rgba(249,112,102,.12);
  border-color: rgba(249,112,102,.3);
}

/* Metrics row */
.metrics {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.pill {
  border: 1px solid var(--border);
  background: rgba(255,255,255,.04);
  padding: 4px 8px;
  border-radius: 999px;
  font-size: 11px;
  color: var(--muted);
}

/* Canvases */
.canvases {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.canvas-wrap {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: rgba(5,10,18,.55);
  overflow: hidden;
}

canvas {
  display: block;
  width: 100%;
  height: auto;
}

#c-flow { height: 280px; }
#c-output { height: 150px; }

.legend {
  display: flex;
  gap: 10px;
  padding: 4px 10px 6px;
  font-size: 11px;
  color: var(--muted);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 5px;
}

.swatch {
  width: 10px;
  height: 10px;
  border-radius: 3px;
  border: 1px solid rgba(255,255,255,.1);
}
.swatch.good { background: #32d583; }
.swatch.bad { background: #f97066; }
.swatch.muted { background: rgba(255,255,255,.08); }

/* Tooltip (shared, appended to body by JS) */
.tooltip {
  position: fixed;
  z-index: 9999;
  pointer-events: none;
  padding: 6px 8px;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,.14);
  background: rgba(10,16,30,.92);
  color: rgba(255,255,255,.9);
  box-shadow: 0 12px 40px rgba(0,0,0,.5);
  font-size: 11px;
  line-height: 1.25;
  white-space: nowrap;
  opacity: 0;
  transform: translateY(2px);
  transition: opacity .08s ease, transform .08s ease;
}
.tooltip.show {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 520px) {
  .toolbar { flex-direction: column; }
  .controls { flex-wrap: wrap; }
}