/* Shared styling for all demos. Clean, light, honest — system fonts, no dark-tech glass.
   Every value is tokenized as a :root var for consistency across demos. */
:root {
  --bg: #f4f4f2;
  --bg-canvas: #1b1d21;        /* the 3D canvas wants a dark stage; UI chrome stays light */
  --panel-bg: #ffffff;
  --panel-border: #d6d6d2;
  --ink: #1a1a1a;
  --ink-soft: #5d5d5a;
  --accent: #1d6fe0;
  --accent-ink: #ffffff;
  --good: #1a8a3a;
  --warn: #c47f00;
  --bad: #c0392b;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --radius: 6px;
  --gap: 12px;
  --pad: 14px;
  --bar-h: 48px;
  --shadow: 0 1px 3px rgba(0,0,0,.12), 0 1px 2px rgba(0,0,0,.08);
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--bg);
  font-size: 14px;
  line-height: 1.45;
}
a { color: var(--accent); }

/* Top bar shared across demos */
.topbar {
  height: var(--bar-h);
  display: flex; align-items: center; gap: var(--gap);
  padding: 0 var(--pad);
  background: var(--panel-bg);
  border-bottom: 1px solid var(--panel-border);
  position: sticky; top: 0; z-index: 10;
}
.topbar .home { text-decoration: none; font-weight: 600; color: var(--ink); }
.topbar .home:hover { color: var(--accent); }
.topbar h1 { font-size: 15px; margin: 0; font-weight: 600; }
.topbar .tag {
  font-family: var(--mono); font-size: 11px; color: var(--ink-soft);
  border: 1px solid var(--panel-border); border-radius: 100px; padding: 2px 8px;
}
.topbar .spacer { flex: 1; }

/* Demo layout: stage + side control panel */
.stage-wrap { display: grid; grid-template-columns: 1fr 320px; height: calc(100vh - var(--bar-h)); }
.stage-wrap.no-panel { grid-template-columns: 1fr; }
.stage { position: relative; background: var(--bg-canvas); overflow: hidden; }
.stage canvas { display: block; width: 100%; height: 100%; }

.panel {
  background: var(--panel-bg);
  border-left: 1px solid var(--panel-border);
  overflow-y: auto; padding: var(--pad);
}
.panel section { margin-bottom: 20px; }
.panel h2 { font-size: 12px; text-transform: uppercase; letter-spacing: .04em; color: var(--ink-soft); margin: 0 0 8px; }

/* Controls */
.ctrl { margin-bottom: 10px; }
.ctrl label { display: flex; justify-content: space-between; font-size: 12px; margin-bottom: 3px; }
.ctrl label .val { font-family: var(--mono); color: var(--ink-soft); }
.ctrl input[type=range] { width: 100%; }
.btn {
  font: inherit; font-size: 13px; cursor: pointer;
  background: var(--accent); color: var(--accent-ink);
  border: none; border-radius: var(--radius); padding: 7px 12px;
}
.btn:hover { filter: brightness(1.05); }
.btn.secondary { background: #ececea; color: var(--ink); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-row { display: flex; flex-wrap: wrap; gap: 8px; }
input[type=text], select, textarea {
  font: inherit; width: 100%; padding: 7px 9px;
  border: 1px solid var(--panel-border); border-radius: var(--radius); background: #fff;
}
textarea { resize: vertical; min-height: 64px; }

/* Perf HUD overlay (positioned inside .stage) */
.perf-hud {
  position: absolute; top: 10px; left: 10px; z-index: 5;
  font-family: var(--mono); font-size: 11px; line-height: 1.5;
  background: rgba(0,0,0,.62); color: #d7f7d7;
  border-radius: var(--radius); padding: 8px 10px; pointer-events: none;
  min-width: 150px;
}
.perf-hud .k { color: #8fb7ff; }
.perf-hud .big { font-size: 18px; color: #fff; }
.perf-hud .fps-bar { height: 4px; background: #333; border-radius: 2px; margin: 4px 0 6px; overflow: hidden; }
.perf-hud .fps-bar i { display: block; height: 100%; background: var(--good); }

/* status / log line inside stage */
.stage-status {
  position: absolute; bottom: 10px; left: 10px; right: 10px; z-index: 5;
  font-family: var(--mono); font-size: 12px; color: #fff;
  background: rgba(0,0,0,.5); border-radius: var(--radius); padding: 6px 10px;
}

/* badges */
.badge { display: inline-block; font-size: 11px; padding: 1px 7px; border-radius: 100px; font-weight: 600; }
.badge.local { background: #e3f6e8; color: var(--good); }
.badge.server { background: #fdeede; color: var(--warn); }
.badge.network { background: #e7f0fd; color: var(--accent); }