:root {
  font-family: Arial, Helvetica, sans-serif;
  color-scheme: light;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: #f6f7f9;
  color: #111827;
  padding: 24px;
}

.login-card {
  width: min(100%, 420px);
  background: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 16px;
  padding: 32px 24px;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.06);
}

h1 {
  margin: 0 0 8px;
  font-size: 24px;
  line-height: 1.25;
  text-align: center;
}

.subtitle,
.note {
  margin: 0;
  text-align: center;
  color: #4b5563;
  line-height: 1.5;
}

.divider {
  height: 1px;
  background: #e5e7eb;
  margin: 28px 0;
}

.google-button {
  display: flex;
  justify-content: center;
  min-height: 44px;
}

.note {
  margin-top: 16px;
  min-height: 20px;
  font-size: 13px;
  color: #6b7280;
}

.note.is-working { color: #374151; }
.note.is-success { color: #166534; }
.note.is-error { color: #991b1b; }

@media (max-width: 480px) {
  body { padding: 16px; }

  .login-card {
    padding: 28px 20px;
    border-radius: 14px;
  }

  h1 { font-size: 22px; }

  .google-button {
    overflow: hidden;
  }
}