:root {
  color-scheme: light dark;
  --bg: #f6f5f2;
  --fg: #1d1d1f;
  --muted: #6b6b70;
  --panel: #ffffff;
  --border: #e2e0da;
  --accent: #2f6fed;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141416;
    --fg: #ececef;
    --muted: #9a9aa2;
    --panel: #1d1d21;
    --border: #2e2e34;
    --accent: #7aa5ff;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}
main { max-width: 860px; margin: 0 auto; padding: 48px 16px; }
h1 { font-size: 1.4rem; margin: 0 0 4px; letter-spacing: -0.01em; }
header p { margin: 0 0 24px; color: var(--muted); }

gesture-textbox {
  --gesture-trace: var(--accent);
  font-size: 24px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 18px;
  min-height: 240px;
}
gesture-textbox:focus-within { border-color: var(--accent); }

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  align-items: center;
  margin-top: 16px;
  color: var(--muted);
  font-size: 0.9rem;
}
.controls label { display: flex; align-items: center; gap: 8px; }
.controls input[type="range"] { width: 120px; accent-color: var(--accent); }
.controls button {
  font: inherit;
  color: var(--fg);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 12px;
  cursor: pointer;
}
.controls button:hover { border-color: var(--accent); }