/* Shared styling for Brain/graphics demos. Dark, legible, no dependencies. */

:root {
  --bg: #0f1115;
  --panel: #171a21;
  --panel-2: #1e222b;
  --line: #2b313d;
  --ink: #e6e9ef;
  --ink-dim: #9aa3b2;
  --ink-faint: #6b7483;
  --accent: #6aa9ff;
  --accent-2: #ffb86b;
  --good: #5fd3a0;
  --bad: #ff6b81;
  --radius: 10px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 24px 16px 56px;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 980px; margin: 0 auto; }

header { margin-bottom: 20px; }

h1 {
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 6px;
}

.lede {
  margin: 0;
  color: var(--ink-dim);
  max-width: 62ch;
}

.stage {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px;
  margin: 18px 0;
}

canvas {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 6px;
  background: #0b0d11;
  touch-action: none;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 22px;
  align-items: center;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.ctl { display: flex; flex-direction: column; gap: 4px; min-width: 160px; }

.ctl > label {
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  display: flex;
  justify-content: space-between;
  gap: 10px;
}

.ctl .val { color: var(--accent); font-family: var(--mono); text-transform: none; letter-spacing: 0; }

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 20px;
  background: transparent;
  margin: 0;
}
input[type="range"]::-webkit-slider-runnable-track {
  height: 4px; border-radius: 2px; background: var(--panel-2);
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 14px; height: 14px; margin-top: -5px;
  border-radius: 50%; background: var(--accent); border: none; cursor: pointer;
}
input[type="range"]::-moz-range-track { height: 4px; border-radius: 2px; background: var(--panel-2); }
input[type="range"]::-moz-range-thumb {
  width: 14px; height: 14px; border: none; border-radius: 50%; background: var(--accent); cursor: pointer;
}

.ctl.check { flex-direction: row; align-items: center; gap: 8px; min-width: 0; }
.ctl.check label { text-transform: none; letter-spacing: 0; font-size: 0.9rem; color: var(--ink); }
input[type="checkbox"] { accent-color: var(--accent); width: 15px; height: 15px; }

button, select {
  font: inherit;
  color: var(--ink);
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 7px 13px;
  cursor: pointer;
}
button:hover, select:hover { border-color: var(--accent); }
button.on { background: var(--accent); color: #0b0d11; border-color: var(--accent); font-weight: 600; }

.readout {
  font-family: var(--mono);
  font-size: 0.84rem;
  color: var(--ink-dim);
  background: var(--panel-2);
  border-radius: 6px;
  padding: 10px 12px;
  margin-top: 12px;
  white-space: pre-wrap;
}

.note {
  margin: 18px 0 0;
  padding: 13px 15px;
  border-left: 3px solid var(--accent);
  background: var(--panel);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--ink-dim);
}
.note strong { color: var(--ink); font-weight: 600; }

.hint { color: var(--ink-faint); font-size: 0.85rem; margin-top: 10px; }

.legend { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 12px; font-size: 0.85rem; color: var(--ink-dim); }
.legend span { display: flex; align-items: center; gap: 7px; }
.legend i { width: 11px; height: 11px; border-radius: 3px; display: inline-block; }

.cols { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

.back { display: inline-block; margin-top: 28px; color: var(--ink-faint); text-decoration: none; font-size: 0.85rem; }
.back:hover { color: var(--accent); }

code { font-family: var(--mono); font-size: 0.88em; background: var(--panel-2); padding: 1px 5px; border-radius: 4px; }

@media (max-width: 560px) {
  .ctl { min-width: 100%; }
}