:root {
  --nav-margin: 20px;
  --nav-size: 64px;
}

@media (max-width: 428px) {
  :root {
    --nav-margin: 12px;
    --nav-size: 44px;
  }
}

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: #eb4125;
  font-family: -apple-system, sans-serif;
  color: #fdf3be;
  -webkit-user-select: none;
  user-select: none;
  touch-action: none;
}

#home, #stage {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

#home[hidden], #stage[hidden], #nav[hidden] {
  display: none;
}

#play-button {
  margin-top: 24px;
  width: 200px;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
}

#play-button svg {
  width: 100%;
  height: auto;
  display: block;
}

#nav {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

#nav button {
  position: absolute;
  bottom: var(--nav-margin);
  width: var(--nav-size);
  height: var(--nav-size);
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  pointer-events: auto;
}

#nav button svg {
  width: 100%;
  height: 100%;
  display: block;
}

#nav [data-action="back"] {
  left: var(--nav-margin);
  width: auto;
  padding: 0 20px;
  border: 3px solid #fdf3be;
  border-radius: 999px;
  color: #fdf3be;
  font: 700 18px -apple-system, sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
}

#nav [data-action="skip"] {
  right: var(--nav-margin);
}

#nav button:disabled {
  opacity: 0.3;
  pointer-events: none;
}

.ant-dance {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  padding: 40px 20px;
  box-sizing: border-box;
}

.ant-dance__ants {
  display: flex;
  gap: 40px;
  align-items: flex-end;
  height: 35%;
}

.ant-dance__ant {
  height: 100%;
}

.ant-dance__ant svg {
  height: 100%;
  width: auto;
  display: block;
}

.ant-dance__keyboard {
  position: relative;
  width: 100%;
  max-width: 700px;
  height: 45%;
}

.ant-dance__naturals {
  display: flex;
  width: 100%;
  height: 100%;
  gap: 2px;
}

.ant-dance__key {
  touch-action: none;
}

.ant-dance__key--natural {
  flex: 1;
}

.ant-dance__key--natural svg {
  width: 100%;
  height: 100%;
  display: block;
}

.ant-dance__key--sharp {
  position: absolute;
  top: 0;
  width: calc(100% / 7 * 0.6);
  height: 65%;
  transform: translateX(-50%);
  z-index: 2;
}

.ant-dance__key--sharp svg {
  width: 100%;
  height: 100%;
  display: block;
}