:root { color-scheme: light dark; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, rgba(120,120,255,.25), rgba(0,0,0,0));
}
.card {
  width: min(720px, calc(100% - 32px));
  border-radius: 16px;
  padding: 28px;
  border: 1px solid rgba(127,127,127,.35);
  backdrop-filter: blur(6px);
  box-shadow: 0 10px 30px rgba(0,0,0,.15);
}
h1 { margin: 0 0 10px; font-size: 2rem; }
p { margin: 0 0 10px; line-height: 1.5; }
.meta { opacity: .85; font-size: .95rem; }