:root {
  --fg: #1a1a1a;
  --bg: #fafafa;
  --accent: #2c6e9b;
  --warning-bg: #fff4d6;
  --warning-border: #d8b144;
  --error: #b03030;
}

* { box-sizing: border-box; }
body {
  font-family: system-ui, -apple-system, sans-serif;
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}
main {
  width: 100%;
  max-width: 480px;
  padding: 32px;
  background: white;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  margin: 24px;
}
h1 { margin-top: 0; }
.banner-warning {
  background: var(--warning-bg);
  border: 1px solid var(--warning-border);
  padding: 12px;
  border-radius: 4px;
  margin-bottom: 24px;
  font-size: 14px;
}
form { display: flex; flex-direction: column; gap: 16px; }
label { display: flex; flex-direction: column; gap: 4px; font-size: 14px; }
input[type="text"], input[type="password"] {
  font-size: 16px;
  padding: 8px 10px;
  border: 1px solid #ccc;
  border-radius: 4px;
}
.row { display: flex; gap: 8px; }
.row input { flex: 1; }
button {
  font-size: 16px;
  padding: 10px 14px;
  background: var(--accent);
  color: white;
  border: 0;
  border-radius: 4px;
  cursor: pointer;
}
button[type="button"] {
  background: #eee;
  color: var(--fg);
  flex: 0 0 auto;
}
.hint { font-size: 12px; color: #666; min-height: 1em; }
.hint.ok { color: #2a7a4a; }
.hint.bad { color: var(--error); }
.error {
  background: #fde7e7;
  border: 1px solid var(--error);
  color: var(--error);
  padding: 10px;
  border-radius: 4px;
}
#submit:disabled { opacity: 0.5; cursor: not-allowed; }