body {
  font-family: system-ui, sans-serif;
  background: #f0f2f5;
  margin:0;
  padding: 30px;
}
.container {
  max-width: 420px;
  margin: 40px auto;
  background: white;
  padding: 2.5rem;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}
h1 { text-align:center; margin-bottom: 1.8rem; }
.form-group { margin-bottom: 1.4rem; }
label { display:block; margin-bottom: 0.4rem; font-weight:500; }
input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #ddd;
  border-radius: 6px;
  box-sizing: border-box;
}
.btn {
  width: 100%;
  padding: 12px;
  background: #0066cc;
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 1.05rem;
  cursor: pointer;
}
.btn:hover { background: #0055aa; }
.btn.logout { background: #c41e3b; }
.btn.logout:hover { background: #a51830; }
.error  { color: #c41e3b; margin-bottom: 1rem; }
.success { color: #2e7d32; margin-bottom: 1rem; }