:root {
  --paper: #f5f6f1;
  --ink: #21211f;
  --ink-deep: #1a1a1a;
  --mark: #f1f2ed;
  --mute: #7e7f7a;
  --rule: #d4d5d0;
  --ease-standard: cubic-bezier(.4, 0, .2, 1);
  --ease-pulse: cubic-bezier(.4, 0, .6, 1);
  --dur-fast: 150ms;
  --pulse-dot: 1.6s;
  --pulse: 2s;
}