* {
  box-sizing: border-box;
  font-family: Arial, Helvetica, sans-serif;
}

body {
  margin: 0;
  background: #0f172a;
  color: #fff;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.card {
  background: #111827;
  padding: 24px;
  max-width: 420px;
  width: 100%;
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(0,0,0,.4);
  text-align: center;
}

h1 {
  font-size: 22px;
  margin-bottom: 8px;
}

.sub {
  color: #94a3b8;
  font-size: 14px;
  margin-bottom: 16px;
}

.desc {
  font-size: 14px;
  margin-bottom: 20px;
  line-height: 1.5;
}

button {
  width: 100%;
  padding: 14px;
  font-size: 16px;
  border: none;
  border-radius: 10px;
  background: #22c55e;
  color: #062e15;
  font-weight: bold;
  cursor: pointer;
}

button:hover {
  background: #16a34a;
}

footer {
  margin-top: 18px;
  font-size: 11px;
  color: #94a3b8;
  line-height: 1.4;
}