/* Petri Dish — page chrome, theme and controls.
   Everything inside the dish (agents, trails, chart) is drawn in js/. */

*, *::before, *::after { box-sizing: border-box; }

:root {
  color-scheme: light dark;

  --bg: #f2f5f3;
  --panel: #ffffff;
  --panel-2: #eef3f0;
  --text: #121a16;
  --muted: #5c7068;
  --line: #d9e2dd;
  --accent: #0f766e;
  --prey: #1f7a45;
  --pred: #a8462f;
  --shadow-sm: 0 1px 2px rgba(14, 28, 21, 0.06);
  --shadow-lg: 0 10px 30px rgba(14, 28, 21, 0.09);

  --radius: 14px;
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #070a09;
    --panel: #0f1513;
    --panel-2: #151d19;
    --text: #e4eee8;
    --muted: #8ba79a;
    --line: #1f2a26;
    --accent: #4ade80;
    --prey: #86c79c;
    --pred: #e08a72;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 14px 36px rgba(0, 0, 0, 0.45);
  }
}

html { height: 100%; }

body {
  margin: 0;
  min-height: 100%;
  height: 100vh;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 var(--font);
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}

/* ---------- header ---------- */

.topbar {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 4px 16px;
  padding: 16px 24px 12px;
}

.topbar h1 {
  margin: 0;
  font-size: 17px;
  font-weight: 650;
  letter-spacing: 0.005em;
}

.tagline {
  margin: 0;
  max-width: 88ch;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

/* ---------- layout ---------- */

.layout {
  flex: 1 1 auto;
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 16px;
  padding: 0 24px 24px;
}

.stage { min-width: 0; min-height: 0; }

.canvas-wrap {
  position: relative;
  width: 100%;
  height: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: #080b0a;
  box-shadow: var(--shadow-lg);
}

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

/* ---------- heads-up display ---------- */

.hud {
  position: absolute;
  margin: 0;
  padding: 5px 9px;
  border-radius: 8px;
  background: rgba(7, 11, 9, 0.66);
  border: 1px solid rgba(206, 232, 220, 0.12);
  color: rgba(219, 236, 227, 0.82);
  font: 500 12px/1.2 var(--mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
  pointer-events: none;
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
}

.hud--fps { top: 14px; right: 14px; display: flex; gap: 7px; align-items: baseline; }
.hud--fps .hud__key { color: rgba(219, 236, 227, 0.5); font-size: 10.5px; letter-spacing: 0.09em; }
.hud--fps .hud__val { min-width: 2ch; text-align: right; }

.hud--counts { bottom: 14px; left: 14px; display: flex; gap: 7px; align-items: baseline; }
.hud--counts .hud__val { color: #cfe8dc; }
.hud--counts .hud__sep { color: rgba(219, 236, 227, 0.35); }

.hud--paused {
  top: 14px;
  left: 14px;
  color: rgba(255, 232, 200, 0.92);
  border-color: rgba(255, 210, 150, 0.24);
  background: rgba(28, 20, 8, 0.7);
}

/* ---------- sidebar ---------- */

.sidebar {
  min-height: 0;
  overflow-y: auto;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow-sm);
}

.sidebar h2 {
  margin: 0 0 4px;
  font-size: 13px;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.sidebar__intro {
  margin: 0 0 14px;
  font-size: 12.5px;
  line-height: 1.45;
  color: var(--muted);
}

.control + .control { margin-top: 16px; }

.btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel-2);
  color: var(--text);
  font: inherit;
  font-size: 14px;
  font-weight: 550;
  text-align: left;
  cursor: pointer;
  transition: background-color 0.14s ease, border-color 0.14s ease, transform 0.06s ease;
}

.btn:hover { background: color-mix(in srgb, var(--panel-2) 82%, var(--text)); }
.btn:active { transform: translateY(1px); }

.btn:focus-visible,
input[type="range"]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.btn--prey { border-color: color-mix(in srgb, var(--prey) 34%, var(--line)); }
.btn--pred { border-color: color-mix(in srgb, var(--pred) 34%, var(--line)); }

.btn__count {
  min-width: 3.2ch;
  padding: 1px 7px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--text) 8%, transparent);
  color: var(--muted);
  font: 600 12.5px/1.5 var(--mono);
  font-variant-numeric: tabular-nums;
  text-align: center;
}

.btn--prey .btn__count { color: var(--prey); }
.btn--pred .btn__count { color: var(--pred); }

.label {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 6px;
  font-size: 14px;
  font-weight: 550;
}

.label__value {
  color: var(--muted);
  font: 600 12.5px/1.4 var(--mono);
  font-variant-numeric: tabular-nums;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  display: block;
  width: 100%;
  height: 22px;
  margin: 0;
  background: transparent;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 4px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--text) 14%, transparent);
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  margin-top: -6px;
  border: 0;
  border-radius: 50%;
  background: var(--accent);
}

input[type="range"]::-moz-range-track {
  height: 4px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--text) 14%, transparent);
}

input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border: 0;
  border-radius: 50%;
  background: var(--accent);
}

.hint {
  margin: 6px 2px 0;
  font-size: 12px;
  line-height: 1.45;
  color: var(--muted);
}

.note {
  margin: 18px 2px 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  line-height: 1.45;
  color: var(--muted);
}

.noscript {
  margin: 0;
  padding: 12px 24px 24px;
  color: var(--muted);
}

/* ---------- utilities ---------- */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -48px;
  z-index: 10;
  padding: 8px 14px;
  border-radius: 0 0 10px 10px;
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--line);
  text-decoration: none;
  font-size: 13px;
  transition: top 0.12s ease;
}

.skip-link:focus { top: 0; }

/* ---------- responsive ---------- */

@media (max-width: 900px) {
  body { height: auto; overflow: auto; }
  .layout { grid-template-columns: minmax(0, 1fr); }
  .canvas-wrap { height: auto; aspect-ratio: 1 / 1; }
  .sidebar { overflow: visible; }
  .topbar { padding: 14px 16px 10px; }
  .layout { padding: 0 16px 20px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}