:root {
  --bg: #09090a;
  --surface: #16161a;
  --text: #ebebeb;
  --muted: #b4b3b5;
  --accent: #8b5cf6;
}
html,
body {
  height: 100%;
  margin: 0;
  overflow: hidden; /* prevent scrolling */
  background: radial-gradient(
    1200px 800px at 50% -10%,
    #1a1a25 0%,
    var(--bg) 60%
  );
  color: var(--text);
  font:
    400 16px/1.6 system-ui,
    -apple-system,
    Segoe UI,
    Roboto,
    Ubuntu,
    Cantarell,
    Noto Sans,
    sans-serif;
}
.wrap {
  height: 100vh; /* exact viewport height */
  display: grid;
  place-items: center;
  text-align: center;
}
.card {
  max-width: 600px;
  background: color-mix(in oklab, var(--surface) 92%, black);
  border: 1px solid color-mix(in oklab, var(--surface), white 6%);
  border-radius: 16px;
  padding: clamp(1.5rem, 2.5vw + 1rem, 3rem);
  box-shadow:
    0 10px 30px rgba(0, 0, 0, 0.35),
    inset 0 1px 0 rgba(255, 255, 255, 0.02);
  text-align: left;
}
h1 {
  margin: 0 0 1rem 0;
  font-size: clamp(1.6rem, 3.5vw + 0.5rem, 2.2rem);
  text-align: center;
  background: linear-gradient(
    180deg,
    var(--text),
    color-mix(in oklab, var(--text), var(--accent) 24%)
  );
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
p {
  margin: 0.5rem 0;
  font-size: 1rem;
  color: var(--text);
  line-height: 1.5;
}
.note {
  position: fixed;
  bottom: 2rem; /* sits just above footer */
  left: 0;
  right: 0;
  text-align: center;
  font-size: 0.75rem;
  color: var(--muted);
  opacity: 0.8;
}
footer {
  position: fixed;
  bottom: 0.75rem;
  left: 0;
  right: 0;
  text-align: center;
  font-size: 0.75rem;
  color: color-mix(in oklab, var(--muted), white 10%);
  opacity: 0.7;
  user-select: none;
}