* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", Arial, sans-serif;
  background: linear-gradient(145deg, #081833, #14386e);
  color: #16253b;
}

.shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 20px;
}

.card {
  width: min(420px, 100%);
  background: white;
  border-radius: 16px;
  padding: 22px;
  box-shadow: 0 12px 28px rgba(0, 7, 18, 0.35);
}

.eyebrow {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: #58708f;
}

h1 {
  margin: 8px 0;
}

.subtitle {
  margin-top: 0;
  color: #58708f;
  font-size: 14px;
}

form {
  display: grid;
  gap: 10px;
}

label {
  font-size: 13px;
  color: #516783;
}

input {
  height: 42px;
  border: 1px solid #d7e3f3;
  border-radius: 10px;
  padding: 0 10px;
}

button {
  margin-top: 8px;
  border: none;
  border-radius: 10px;
  height: 42px;
  background: #0e5fc7;
  color: white;
  font-weight: 700;
  cursor: pointer;
}

#message {
  min-height: 20px;
  margin-top: 10px;
  font-size: 13px;
}