:root {
  color-scheme: light;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

/* Shared "clean business" theme for all auth pages (sign-in + error pages):
   a centered white card on a near-white background. */
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #f8fafc;
  color: #1a2433;
}

main {
  max-width: 26rem;
  width: calc(100% - 2rem);
  padding: 2.5rem 2.25rem;
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 0.75rem;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  text-align: center;
}

h1 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  color: #15355e;
}

.tagline {
  color: #55627a;
  margin-bottom: 1.5rem;
  line-height: 1.5;
  text-wrap: balance;
}

.btn {
  display: inline-block;
  padding: 0.7rem 1.4rem;
  background: #0f62b5;
  color: #ffffff;
  font-weight: 600;
  text-decoration: none;
  border-radius: 0.5rem;
  transition: background 0.15s ease;
}

.btn:hover,
.btn:focus {
  background: #0d5299;
}