:root{
  --bg:#0b1220;
  --panel:#0f1b32;
  --panel2:#0d1830;
  --border:rgba(255,255,255,.08);
  --text:rgba(255,255,255,.9);
  --muted:rgba(255,255,255,.65);
  --muted2:rgba(255,255,255,.45);
  --good:#32d583;
  --bad:#f97066;
  --accent:#7c3aed;
  --accent2:#22d3ee;
  --shadow: 0 18px 55px rgba(0,0,0,.55);
  --radius: 14px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
}

*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family:var(--sans);
  color:var(--text);
  background:
    radial-gradient(1200px 700px at 15% 10%, rgba(124,58,237,.28), transparent 60%),
    radial-gradient(900px 600px at 85% 25%, rgba(34,211,238,.18), transparent 60%),
    radial-gradient(900px 600px at 60% 100%, rgba(50,213,131,.08), transparent 60%),
    var(--bg);
}

.app{
  width:min(1200px, 96vw);
  margin:24px auto 40px;
}

.header{
  display:flex;
  justify-content:space-between;
  align-items:flex-start;
  gap:18px;
  padding:18px 18px 0;
}

.title{
  font-weight:800;
  letter-spacing:-.02em;
  font-size:28px;
  line-height:1.1;
}

.subtitle{
  margin-top:6px;
  color:var(--muted);
  font-size:14px;
  line-height:1.35;
  max-width:560px;
}

.pill-row{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  justify-content:flex-end;
}

.pill{
  border:1px solid var(--border);
  background:rgba(255,255,255,.04);
  padding:8px 10px;
  border-radius:999px;
  font-size:12px;
  color:var(--muted);
  box-shadow: 0 10px 30px rgba(0,0,0,.25);
}

.main{
  display:grid;
  grid-template-columns: 340px 1fr;
  grid-template-rows: auto auto;
  gap:14px;
  padding:14px 18px 0;
}

.panel{
  background: linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,.02));
  border:1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding:14px;
}

.panel-title{
  font-size:13px;
  color:rgba(255,255,255,.85);
  font-weight:700;
  letter-spacing:.02em;
  text-transform:uppercase;
  margin-bottom:12px;
}

.controls{
  grid-row:1 / span 2;
}

.viz{
  grid-column:2;
}

.charts{
  grid-column:2;
}

.slider{
  padding:10px 10px 12px;
  background:rgba(11,18,32,.55);
  border:1px solid rgba(255,255,255,.06);
  border-radius:12px;
  margin-bottom:10px;
}

.slider-top{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  margin-bottom:8px;
}

.label{
  font-size:13px;
  color:rgba(255,255,255,.82);
  font-weight:650;
}
.value{
  font-size:12px;
  color:var(--muted);
  font-variant-numeric: tabular-nums;
}
.mono{ font-family: var(--mono); }

input[type="range"]{
  width:100%;
  accent-color: var(--accent2);
}

.row{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:6px 2px;
}
.subtle .label{ color: var(--muted); font-weight:600; }
.subtle .value{ color: var(--muted2); }

.hint{
  color:var(--muted2);
  font-size:12px;
  line-height:1.35;
  margin:2px 2px 10px;
}

.divider{
  height:1px;
  background: rgba(255,255,255,.08);
  margin:12px 0;
}

.controls-row{
  display:flex;
  gap:10px;
  margin-bottom:10px;
}

.btn{
  border:1px solid rgba(255,255,255,.12);
  background:rgba(255,255,255,.06);
  color:rgba(255,255,255,.85);
  padding:10px 12px;
  border-radius:12px;
  cursor:pointer;
  font-weight:700;
  letter-spacing:.01em;
  transition: transform .08s ease, background .15s ease, border-color .15s ease;
  user-select:none;
}
.btn:hover{ background:rgba(255,255,255,.085); border-color: rgba(255,255,255,.18); }
.btn:active{ transform: translateY(1px); }
.btn.primary{
  background: linear-gradient(135deg, rgba(124,58,237,.95), rgba(34,211,238,.75));
  border-color: rgba(255,255,255,.18);
}
.btn.danger{
  background: rgba(249,112,102,.12);
  border-color: rgba(249,112,102,.35);
}

canvas{
  display:block;
  width:100%;
  height:auto;
  border-radius: 12px;
  background: rgba(5,10,18,.55);
  border: 1px solid rgba(255,255,255,.06);
}

/* Fix initial “growing” layout by giving canvases stable CSS heights. */
#c-flow{ height:420px; }
#c-hist, #c-output{ height:240px; }

.tooltip{
  position: fixed;
  z-index: 9999;
  pointer-events: none;
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid rgba(255,255,255,.14);
  background: rgba(10,16,30,.92);
  color: rgba(255,255,255,.9);
  box-shadow: 0 18px 55px rgba(0,0,0,.55);
  font-size: 12px;
  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);
}

.legend{
  display:flex;
  gap:12px;
  align-items:center;
  margin-top:10px;
  color:var(--muted2);
  font-size:12px;
}
.legend-item{ display:flex; align-items:center; gap:8px; }
.swatch{
  width:12px;
  height:12px;
  border-radius:4px;
  border:1px solid rgba(255,255,255,.12);
}
.swatch.muted{ background: rgba(255,255,255,.08); }

.chart-grid{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap:12px;
}
.chart-card{
  padding:10px;
  border: 1px solid rgba(255,255,255,.06);
  background: rgba(11,18,32,.35);
  border-radius: 12px;
}
.chart-head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  margin:0 0 8px;
}
.chart-title{
  font-size:12px;
  color: var(--muted);
  margin:0;
  font-weight:650;
}
.chart-controls{
  display:flex;
  gap:6px;
  flex-wrap: wrap;
}
.mini-btn{
  border:1px solid rgba(255,255,255,.12);
  background:rgba(255,255,255,.06);
  color:rgba(255,255,255,.82);
  padding:6px 8px;
  border-radius:10px;
  cursor:pointer;
  font-weight:800;
  line-height:1;
}
.mini-btn:hover{ background:rgba(255,255,255,.085); border-color: rgba(255,255,255,.18); }

.details{
  margin-top:6px;
  border:1px solid rgba(255,255,255,.06);
  background: rgba(11,18,32,.45);
  border-radius: 12px;
  padding: 8px 10px;
}
.details summary{
  cursor:pointer;
  color: rgba(255,255,255,.8);
  font-weight:700;
  font-size:13px;
}
.details-body{
  color: var(--muted);
  font-size:12px;
  line-height:1.4;
}
.details-body ul{ margin:10px 0 0 18px; padding:0; }
.details-body li{ margin:6px 0; }

.footer{
  margin:14px 18px 0;
  color: var(--muted2);
  font-size:12px;
  text-align:center;
}

@media (max-width: 980px){
  .main{
    grid-template-columns: 1fr;
  }
  .controls{ grid-row:auto; }
  .viz, .charts{ grid-column:1; }
  .chart-grid{ grid-template-columns: 1fr; }
  .header{ flex-direction:column; align-items:flex-start; padding-bottom: 6px; }
  .pill-row{ justify-content:flex-start; }
}