@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600&display=swap');

body {
  margin: 1rem;
  font-family: 'Inter', sans-serif;
  background: #fff;
  color: #111;
}

body > * + * {
  margin-top: 1rem;
}

h1 {
  font-size: 1.5rem;
  font-weight: 600;
  padding-bottom: 0.25em;
  border-bottom: 2px solid #10b981;
  display: inline-block;
}

button {
  cursor: pointer;
  font: inherit;
}

.btn {
  background: #f1f5f9;
  border: 1px solid #cbd5e1;
  border-radius: 4px;
  padding: 0.4em 0.8em;
  transition: background .2s, box-shadow .2s;
}

.btn:hover {
  background: #e2e8f0;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}