:root {
  color-scheme: light;
  font-family: "Noto Sans JP", sans-serif;
  color: #172033;
  background: #edf2f7;
}

* { box-sizing: border-box; }

body {
  min-height: 100vh;
  margin: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  background: radial-gradient(circle at top, #ffffff 0, #edf2f7 55%, #dde6ef 100%);
}

.login-card {
  width: min(100%, 420px);
  padding: 36px;
  border: 1px solid #d5dee8;
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 18px 50px rgb(23 32 51 / 12%);
}

.eyebrow {
  margin: 0 0 8px;
  color: #376b68;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .12em;
}

h1 { margin: 0; font-size: 28px; }
.lead { margin: 10px 0 28px; color: #607086; line-height: 1.7; }
.fields { display: grid; gap: 10px; }
label { margin-top: 6px; font-size: 14px; font-weight: 600; }

input {
  width: 100%;
  border: 1px solid #b8c5d2;
  border-radius: 10px;
  padding: 12px 13px;
  color: inherit;
  background: #fff;
  font: inherit;
}

input:focus { outline: 3px solid #bce1dd; border-color: #2c7771; }

button {
  margin-top: 12px;
  border: 0;
  border-radius: 10px;
  padding: 13px 18px;
  color: #fff;
  background: #245f5a;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

button:disabled { opacity: .55; cursor: wait; }
.error { min-height: 1.5em; margin: 16px 0 0; color: #a12d34; font-size: 14px; }

@media (max-width: 480px) {
  .login-card { padding: 28px 22px; }
}