:root {
  color-scheme: light dark;
}
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family:
    system-ui,
    -apple-system,
    "Segoe UI",
    Roboto,
    sans-serif;
  background: #f4f6f8;
  color: #1a2733;
}
.card {
  max-width: 32rem;
  margin: 1rem;
  padding: 2.5rem 2rem;
  background: #fff;
  border-radius: 0.75rem;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  text-align: center;
}
h1 {
  font-size: 1.35rem;
  margin: 0 0 1rem;
}
p {
  line-height: 1.5;
  margin: 0.5rem 0;
}
.target {
  font-weight: 600;
  word-break: break-all;
}
.countdown {
  display: inline-block;
  margin-top: 1.25rem;
  font-size: 1.5rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.continue {
  display: inline-block;
  margin-top: 1rem;
  color: #0b5fa5;
}
@media (prefers-color-scheme: dark) {
  body {
    background: #14181d;
    color: #e6ebf0;
  }
  .card {
    background: #1e242b;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
  }
  .continue {
    color: #6db3f2;
  }
}