/* 🌸 Nền gradient pastel nhẹ nhàng */
body {
  margin: 0;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(-45deg, #a7c5eb, #d5e8d4, #fce1e4, #e2f0cb);
  background-size: 400% 400%;
  animation: gradientMove 15s ease infinite;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

@keyframes gradientMove {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* 🌿 Thẻ login */
.login-card {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  border-radius: 16px;
  box-shadow: 0 8px 25px rgba(0,0,0,0.1);
  padding: 2.5rem;
  width: 100%;
  max-width: 420px;
  animation: fadeIn 1s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

h4 {
  text-align: center;
  font-weight: 700;
  color: #1e3a8a;
}

.text-muted {
  color: #64748b !important;
}

.btn-primary {
  background-color: #2563eb;
  border: none;
  font-weight: 600;
  transition: all 0.3s ease;
}
.btn-primary:hover {
  background-color: #1d4ed8;
  transform: translateY(-1px);
}

input.form-control {
  border-radius: 10px;
  border: 1px solid #cbd5e1;
  padding: 10px 12px;
}
input.form-control:focus {
  border-color: #2563eb;
  box-shadow: 0 0 0 0.2rem rgba(37,99,235,0.25);
}

footer {
  text-align: center;
  margin-top: 1.5rem;
  color: #64748b;
  font-size: 0.85rem;
}

.login-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  color: #1e3a8a;
  margin-bottom: 1rem;
}

.login-logo i {
  font-size: 2rem;
  margin-right: 8px;
  color: #2563eb;
}