:root {
  --bg: #0b0d10;
  --panel: #12161b;
  --text: #e6edf3;
  --muted: #8b949e;
  --accent: #4cc9f0;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f8fa;
    --panel: #ffffff;
    --text: #0b0d10;
    --muted: #57606a;
    --accent: #2f81f7;
  }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body { background: var(--bg); color: var(--text); display: grid; grid-template-rows: auto 1fr; }

header { background: var(--panel); border-bottom: 1px solid #1f2328; padding: 10px 16px; }
header h1 { margin: 0 0 8px 0; font-size: 18px; font-weight: 600; }
.controls { display: grid; gap: 8px; }
.control-group { display: flex; flex-wrap: wrap; gap: 12px 16px; align-items: center; }
/* Hide all advanced-only controls when advanced mode is off */
body.advanced-hidden .advanced-only { display: none; }
#advanced-group { justify-content: flex-end; }
label { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; color: var(--muted); }
input[type="range"] { width: 160px; }
input[type="number"] { width: 80px; }
select, input, button { background: var(--panel); color: var(--text); border: 1px solid #30363d; border-radius: 6px; padding: 6px 8px; }
button { cursor: pointer; }
.buttons #random { border-color: #fff; }
.buttons { display: flex; gap: 8px; align-items: center; }
#status { color: var(--muted); font-size: 12px; flex: 1; }

main { position: relative; min-height: 0; }
canvas { width: 100%; height: 100%; display: block; background: radial-gradient(ellipse at center, rgba(255,255,255,0.03), rgba(0,0,0,0.08)), var(--bg); }

footer { padding: 8px 16px; color: var(--muted); font-size: 12px; border-top: 1px solid #1f2328; background: var(--panel); }