:root {
  color-scheme: dark;
  font-family: Arial, Helvetica, sans-serif;
  background: #141414;
  color: #fff;
}

* { box-sizing: border-box; }

html, body { margin: 0; min-height: 100%; }

body {
  min-height: 100vh;
  background: #141414;
}

.prototype-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.prototype-header {
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 16px 20px;
}

.prototype-title {
  margin: 0 0 10px;
  color: #fff;
  font-size: 26px;
  line-height: 1.2;
  font-weight: 400;
  text-align: center;
}

.prototype-stage {
  width: 100%;
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 0 16px 24px;
}

.prototype-frame {
  display: block;
  width: 375px;
  height: 812px;
  max-width: 100%;
  border: 0;
  background: #141414;
}

@media (max-width: 430px) {
  .prototype-header { padding-inline: 12px; }
  .prototype-title { font-size: 23px; }
  .prototype-stage { padding-inline: 0; }
  .prototype-frame { width: 100vw; }
}