* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  align-items: center;
  background: #0f172a;
  color: #e2e8f0;
  display: flex;
  font-family: system-ui, sans-serif;
  justify-content: center;
  min-height: 100vh;
  padding: 16px;
}
.card {
  background: #1e293b;
  border: 2px solid #334155;
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, .4);
  max-width: 380px;
  padding: 32px;
  width: 100%;
}
h1 { font-size: 20px; margin-bottom: 24px; text-align: center; }
label { color: #94a3b8; display: block; font-size: 13px; margin: 12px 0 6px; }
input {
  background: #0f172a;
  border: 1px solid #475569;
  border-radius: 8px;
  color: #e2e8f0;
  font-size: 14px;
  padding: 10px 12px;
  width: 100%;
}
button {
  background: #6366f1;
  border: none;
  border-radius: 8px;
  color: #fff;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  margin-top: 20px;
  padding: 11px;
  width: 100%;
}
button:hover { background: #4f46e5; }
.err { color: #f87171; font-size: 13px; margin-top: 12px; min-height: 18px; text-align: center; }