:root {
  --ink: #12141a;
  --muted: #4a5160;
  --line: #d6dbe6;
  --bg: #f3f5f8;
  --panel: #ffffff;
  --accent: #0b5fff;
  --danger: #9b1c1c;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Helvetica Neue", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 10% -10%, #dfe8ff 0%, transparent 55%),
    radial-gradient(900px 400px at 90% 0%, #e7f4ef 0%, transparent 50%),
    var(--bg);
  line-height: 1.45;
}

main {
  max-width: 28rem;
  margin: 2.75rem auto;
  padding: 0 1.25rem 3rem;
}

h1 {
  font-size: 1.7rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 0.4rem;
}

.lead {
  margin: 0;
  color: var(--muted);
}

.note {
  margin: 0.85rem 0 0;
  font-size: 0.92rem;
  color: var(--muted);
}

form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1.5rem;
  padding: 1.25rem;
  background: var(--panel);
  border: 1px solid var(--line);
}

label {
  font-weight: 600;
}

input {
  font-size: 1.75rem;
  letter-spacing: 0.35rem;
  padding: 0.65rem 0.8rem;
  text-align: center;
  border: 1px solid var(--line);
}

button {
  font-size: 1rem;
  padding: 0.75rem 1rem;
  border: 0;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
}

.status {
  margin-top: 1.25rem;
  color: var(--danger);
}

.card {
  margin-top: 1.5rem;
  padding: 1.25rem;
  background: var(--panel);
  border: 1px solid var(--line);
}

.card h2 {
  margin: 0 0 0.75rem;
  font-size: 1.15rem;
}

dl {
  display: grid;
  grid-template-columns: 8rem 1fr;
  gap: 0.45rem 0.75rem;
  margin: 0;
}

dt {
  color: var(--muted);
}

dd {
  margin: 0;
  font-weight: 600;
}

.expire {
  margin: 1rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}