body {
  background: #0d1117;
  color: #e6edf3;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-card {
  background: #161b22;
  border: 1px solid #30363d;
  border-radius: 0.75rem;
  width: 100%;
  max-width: 380px;
  padding: 2rem;
}

.brand {
  font-size: 1.3rem;
  font-weight: 700;
  color: #58a6ff;
  text-align: center;
  margin-bottom: 1.75rem;
}

.brand span { color: #e6edf3; }

.form-control { background: #0d1117; border: 1px solid #30363d; color: #e6edf3; }

.form-control:focus {
  background: #0d1117;
  border-color: #58a6ff;
  box-shadow: 0 0 0 3px rgba(88, 166, 255, .15);
  color: #e6edf3;
}

.btn-primary { background: #1f6feb; border-color: #1f6feb; width: 100%; }
.btn-primary:hover { background: #388bfd; border-color: #388bfd; }

.alert { border-radius: 0.5rem; }