/* ------------------------------------------------------------------
   Shared styling for the interactive "Spatial Partition" demos.
   This file is loaded by the standalone demo pages that are embedded
   into the blog post through <iframe>.
   ------------------------------------------------------------------ */

:root {
  --bg: #0e131d;
  --panel: rgba(21, 29, 42, 0.88);
  --line: #2b3648;
  --fg: #e8eefb;
  --muted: #93a3c0;
  --accent: #4cc2ff;
  --accent-2: #ffb454;
  --good: #59d999;
  --bad: #ff6b81;
  --shadow: 0 8px 28px rgba(0, 0, 0, 0.38);
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  font: 13px/1.5 "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC",
        "Microsoft YaHei", sans-serif;
}

#stage { position: absolute; inset: 0; }

canvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
  cursor: crosshair;
}

.overlay { position: absolute; z-index: 2; }

.panel {
  top: 10px;
  left: 10px;
  width: 196px;
  padding: 10px 12px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.panel h4 {
  margin: 0 0 8px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin: 5px 0;
}

.row > label { color: var(--muted); white-space: nowrap; }

.row.col {
  display: block;
}

.row.col > label {
  display: block;
  margin-bottom: 3px;
}

input[type="range"] {
  width: 92px;
  height: 16px;
  accent-color: var(--accent);
  background: transparent;
}

select, button {
  font: inherit;
  padding: 3px 8px;
  color: var(--fg);
  background: #1d2637;
  border: 1px solid var(--line);
  border-radius: 6px;
  cursor: pointer;
}

select:hover, button:hover { border-color: var(--accent); color: #fff; }

button.on {
  background: rgba(76, 194, 255, 0.18);
  border-color: var(--accent);
  color: #cfeaff;
}

.btns {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 9px;
}

.btns button { flex: 1 1 auto; }

.stats {
  left: 10px;
  bottom: 10px;
  min-width: 196px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  box-shadow: var(--shadow);
  font-variant-numeric: tabular-nums;
}

.stats div { display: flex; justify-content: space-between; gap: 14px; }

.stats span { color: var(--muted); }

.stats b { font-weight: 600; color: var(--accent); }

.stats b.good { color: var(--good); }

.stats b.bad { color: var(--bad); }

.hint {
  right: 10px;
  bottom: 10px;
  max-width: 46%;
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  color: var(--muted);
  text-align: right;
}

.legend {
  top: 10px;
  right: 10px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  color: var(--muted);
  box-shadow: var(--shadow);
}

.legend i {
  display: inline-block;
  width: 9px;
  height: 9px;
  margin-right: 6px;
  border-radius: 2px;
  vertical-align: middle;
}

@media (max-width: 560px) {
  .panel { width: 168px; padding: 8px 10px; font-size: 12px; }
  .panel h4 { font-size: 10px; }
  input[type="range"] { width: 64px; }
  .stats { min-width: 168px; font-size: 12px; }
  .hint { display: none; }
  .legend { display: none; }
}