/* Petri Dish — MiniMax M3
   Calm, subdued chrome so the chart's bright lines and the dish life pop. */

:root {
  --bg-deep: #0b0d11;
  --bg-soft: #14171d;
  --bg-panel: #181c23;
  --line-faint: #232832;
  --line-soft: #2d333d;
  --ink-mute: #6b7382;
  --ink: #c2c8d2;
  --ink-bright: #e8ecf2;
  --accent-prey: #2ed47a;     /* chart green */
  --accent-pred: #ff6f5e;     /* chart red/amber */
  --accent-prey-dim: #2ed47a33;
  --accent-pred-dim: #ff6f5e33;
  --shadow: 0 8px 28px rgba(0,0,0,.45);
  --radius: 10px;
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg-deep);
  color: var(--ink);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body {
  min-height: 100vh;
  background:
    radial-gradient(1200px 600px at 20% 0%, #14171d 0%, transparent 60%),
    radial-gradient(900px 500px at 100% 100%, #15171c 0%, transparent 55%),
    var(--bg-deep);
}

.stage {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 24px;
  align-items: start;
  padding: 24px;
  min-height: 100vh;
  max-width: 1480px;
  margin: 0 auto;
}

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

/* --- canvas region --- */
.canvas-wrap {
  position: relative;
  background: var(--bg-soft);
  border: 1px solid var(--line-faint);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  aspect-ratio: 4 / 3;
  min-height: 320px;
}

#dish {
  display: block;
  width: 100%;
  height: 100%;
}

.hud {
  position: absolute;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-mute);
  background: rgba(11, 13, 17, 0.55);
  border: 1px solid var(--line-faint);
  padding: 6px 10px;
  border-radius: 6px;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  user-select: none;
  pointer-events: none;
}

.hud-fps {
  top: 12px;
  right: 12px;
  color: var(--ink);
}

.hud-counts {
  bottom: 12px;
  left: 12px;
  color: var(--ink);
}

.hud-counts .prey-c { color: var(--accent-prey); }
.hud-counts .pred-c { color: var(--accent-pred); }

/* --- sidebar panel --- */
.panel {
  background: var(--bg-panel);
  border: 1px solid var(--line-faint);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  position: sticky;
  top: 24px;
}

.panel-head {
  border-bottom: 1px solid var(--line-faint);
  padding-bottom: 14px;
}

.panel-eyebrow {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-mute);
}

.panel-title {
  font-size: 22px;
  margin: 4px 0 2px;
  color: var(--ink-bright);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.panel-sub {
  margin: 0;
  font-size: 12px;
  color: var(--ink-mute);
}

.ctrl-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.ctrl-group.ctrl-slider {
  grid-template-columns: 1fr;
  gap: 8px;
  padding-top: 4px;
}

.btn {
  appearance: none;
  border: 1px solid var(--line-soft);
  background: #1d222b;
  color: var(--ink);
  font: inherit;
  text-align: left;
  padding: 10px 12px;
  border-radius: 8px;
  cursor: pointer;
  transition: transform .08s ease, background .15s ease, border-color .15s ease;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.btn:hover { background: #232934; border-color: #3a4150; }
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: 2px solid #5a6478; outline-offset: 2px; }

.btn-label {
  font-weight: 600;
  font-size: 13px;
  color: var(--ink-bright);
  letter-spacing: 0.01em;
}

.btn-meta {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-mute);
}

.btn-prey .btn-meta::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  background: var(--accent-prey);
  border-radius: 50%;
  margin-right: 6px;
  vertical-align: middle;
  opacity: 0.9;
}

.btn-pred .btn-meta::before {
  content: "";
  display: inline-block;
  width: 9px;
  height: 9px;
  background: var(--accent-pred);
  border-radius: 50%;
  margin-right: 6px;
  vertical-align: middle;
  opacity: 0.9;
}

.btn-toggle[data-state="pause"] .btn-label::before {
  content: "▶ ";
  color: var(--accent-prey);
  font-size: 11px;
}
.btn-toggle[data-state="run"] .btn-label::before {
  content: "❚❚ ";
  color: var(--accent-pred);
  font-size: 11px;
}

/* slider */
.slider-label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 12px;
  color: var(--ink-mute);
  font-family: var(--mono);
  letter-spacing: 0.06em;
}

.slider-label output {
  color: var(--ink-bright);
  font-weight: 600;
}

.slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: var(--line-soft);
  border-radius: 4px;
  outline: none;
  margin: 6px 0 2px;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink-bright);
  border: 2px solid var(--bg-deep);
  cursor: pointer;
  transition: transform .1s ease;
}
.slider::-webkit-slider-thumb:hover { transform: scale(1.1); }

.slider::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink-bright);
  border: 2px solid var(--bg-deep);
  cursor: pointer;
}

.slider-ticks {
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--ink-mute);
  margin-top: 2px;
}

/* panel footer */
.panel-foot {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-mute);
  border-top: 1px solid var(--line-faint);
  padding-top: 12px;
  letter-spacing: 0.06em;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ink-mute);
  display: inline-block;
}

.dot-live {
  background: var(--accent-prey);
  box-shadow: 0 0 0 0 var(--accent-prey);
  animation: pulse 1.8s ease-out infinite;
}

@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(46, 212, 122, 0.55); }
  70%  { box-shadow: 0 0 0 8px rgba(46, 212, 122, 0); }
  100% { box-shadow: 0 0 0 0 rgba(46, 212, 122, 0); }
}

/* Reduced motion users — dial the world down a notch */
@media (prefers-reduced-motion: reduce) {
  .dot-live { animation: none; }
}