:root {
  font-family: Arial, Helvetica, sans-serif;
  color: #000;
  background: #fff;
}

* { box-sizing: border-box; }

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

body {
  min-height: 100vh;
  background: #fff;
  color: #000;
  transition: background-color 320ms ease;
}

.app, .reader {
  min-height: 100vh;
}

.reader {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 18px;
  text-align: center;
  padding: 24px;
}

.uid {
  font-size: 72pt;
  line-height: 1.05;
  font-weight: 700;
  letter-spacing: 0.03em;
  overflow-wrap: anywhere;
}

.elapsed {
  font-size: 22pt;
  font-weight: 600;
}

.login-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.login-card {
  width: min(360px, 100%);
  display: grid;
  gap: 14px;
  padding: 30px;
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 16px;
  box-shadow: 0 14px 40px rgb(0 0 0 / 12%);
}

.login-card h1, .login-card p { margin: 0; }

.login-card input, .login-card button {
  min-height: 46px;
  border-radius: 8px;
  font: inherit;
}

.login-card input { border: 1px solid #999; padding: 0 12px; }
.login-card button { border: 0; background: #000; color: #fff; cursor: pointer; }
.error { min-height: 1.2em; color: #b00020; }

@media (max-width: 700px) {
  .uid { font-size: 42pt; }
  .elapsed { font-size: 16pt; }
}