:root {
  --ink: #1f2328;
  --muted: #6b7280;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--ink);
  background: #ffffff;
  overflow: hidden; /* No scrolling */
  -webkit-text-size-adjust: 100%;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
}

.center { height: 100dvh; display: grid; place-items: center; gap: 16px; padding: 16px; position: relative; }
.brand { margin: 0; font-weight: 800; letter-spacing: 0.2px; text-align: center; font-size: clamp(18px, 4vw, 24px); color: var(--muted); position: fixed; top: 12px; left: 50%; transform: translateX(-50%); z-index: 2; }
.canvas { width: min(94vw, 680px); height: auto; display: block; border: 0; background: transparent; touch-action: none; user-select: none; -webkit-user-select: none; }

.reset-btn {
  position: fixed;
  top: 10px;
  right: 10px;
  z-index: 3;
  padding: 8px 12px;
  border: 1px solid #d1d5db;
  border-radius: 999px;
  background: #ffffff;
  color: #374151;
  font: 600 13px ui-sans-serif, system-ui, -apple-system;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}
.reset-btn:hover { background: #f9fafb; }