:root { color-scheme: light; }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: #fffff0;
  color: #000;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 17px;
  line-height: 1.5;
}
.page {
  width: min(100%, 640px);
  margin: 0 auto;
  padding: 48px 24px;
  text-align: center;
}
.page > * { margin-top: 0; margin-bottom: 12px; }
.page > :last-child { margin-bottom: 0; }
.logo, .poster, .portrait, .qr { display: block; height: auto; margin-left: auto; margin-right: auto; }
.logo { width: 100%; border: 1px solid #000; padding: 2px; margin-bottom: 16px; }
h1 { font-size: 34px; line-height: 1.25; margin-bottom: 18px; }
p { margin-top: 0; margin-bottom: 18px; }
hr { border: 0; height: 1px; background: #000; margin: 24px 0; }
.poster { width: 100%; border: 4px solid #000; border-radius: 12px; padding: 2px; }
.portrait { width: min(100%, 320px); border: 4px solid #000; border-radius: 12px; padding: 2px; }
.qr { width: min(100%, 260px); border: 4px solid #000; border-radius: 12px; padding: 2px; }
.button {
  display: inline-block;
  max-width: 100%;
  padding: 8px 20px;
  border: 1px solid #730000;
  border-radius: 16px;
  background: #cfb53b;
  box-shadow: 3px 3px 2px #000;
  color: #000;
  font-weight: 700;
  text-decoration: none;
}
.button:hover { background: #fff; }
.button:focus-visible, a:focus-visible { outline: 3px solid #730000; outline-offset: 3px; }
.concert-copy p { margin-bottom: 18px; }
.concert-copy a { color: inherit; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; }
@media (max-width: 480px) {
  body { font-size: 16px; }
  .page { padding: 36px 24px; }
  h1 { font-size: 28px; }
  .button { width: 100%; }
}