:root {
  color-scheme: light;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", sans-serif;
  background: #f5f5f7;
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overscroll-behavior: none;
}

body {
  min-height: 100dvh;
  background: #f5f5f7;
}

main {
  display: grid;
  min-height: 100dvh;
  place-items: center;
  padding: max(24px, env(safe-area-inset-top)) max(24px, env(safe-area-inset-right))
    max(24px, env(safe-area-inset-bottom)) max(24px, env(safe-area-inset-left));
}

button {
  width: min(72vw, 280px);
  aspect-ratio: 1;
  border: 0;
  border-radius: 50%;
  background: #111;
  color: #fff;
  font: inherit;
  font-size: clamp(72px, 25vw, 128px);
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 18px 45px rgb(0 0 0 / 18%);
  touch-action: manipulation;
  user-select: none;
  -webkit-user-select: none;
  transition: transform 80ms ease, background 120ms ease;
}

button:active {
  transform: scale(0.96);
  background: #2c2c2e;
}

button:focus-visible {
  outline: 4px solid #0a84ff;
  outline-offset: 6px;
}