* { box-sizing: border-box; }
body { margin: 0; font-family: system-ui, sans-serif; background: #f5f5f5; color: #222; }
main {
  max-width: 480px; margin: 0 auto; padding: 2rem 1.25rem; min-height: 100vh;
  display: flex; flex-direction: column; gap: 1rem;
}
h1 { font-size: 1.5rem; }
form { display: flex; flex-direction: column; gap: 1rem; }
label { display: flex; flex-direction: column; gap: 0.35rem; font-size: 0.9rem; }
input { padding: 0.75rem; font-size: 1rem; border: 1px solid #ccc; border-radius: 6px; }
button {
  padding: 1rem; font-size: 1.1rem; border: none; border-radius: 8px;
  background: #2563eb; color: white; cursor: pointer;
}
button:disabled { background: #9ca3af; cursor: not-allowed; }
.spinner {
  display: inline-block; width: 1em; height: 1em; margin-right: 0.5em;
  border: 2px solid rgba(255, 255, 255, 0.4); border-top-color: white;
  border-radius: 50%; vertical-align: middle; animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.banner { padding: 0.75rem; border-radius: 6px; text-align: center; }
.banner-ok { background: #dcfce7; color: #166534; }
.banner-error { background: #fee2e2; color: #991b1b; }
.logout-link { text-align: center; color: #666; font-size: 0.85rem; }