:root {
  color: #18181b;
  background: #ecebea;
  font-family: "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
}

.preview-shell {
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr;
  justify-items: center;
  gap: 18px;
  padding: 18px;
}

header {
  width: min(100%, 900px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

header div { display: grid; gap: 2px; }
header span { color: #f36b21; font-size: 12px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
header strong { font-size: 18px; }
header a { color: #18181b; font-size: 14px; font-weight: 700; }

.phone {
  box-sizing: content-box;
  width: 411px;
  height: 868px;
  overflow: hidden;
  border: 8px solid #18181b;
  border-radius: 34px;
  background: #fff;
  box-shadow: 0 24px 70px rgba(24, 24, 27, .22);
}

iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
  background: #fff;
}

@media (max-width: 520px) {
  .preview-shell { display: block; padding: 0; }
  header { display: none; }
  .phone { box-sizing: border-box; width: 100vw; height: 100dvh; border: 0; border-radius: 0; box-shadow: none; }
}