body {
background: radial-gradient(circle at 20% 20%, #e6cf23 0%, transparent 40%),
radial-gradient(circle at 80% 30%, #0095e6 0%, transparent 40%),
radial-gradient(circle at 50% 80%, #e70d49 0%, transparent 40%),
#0d1117; /* base oscura para resaltar */
color: #f3f4f6;
font-family: 'Poppins', sans-serif;
min-height: 100vh;
position: relative;
overflow: hidden;
}

/* Para que las tarjetas resalten sobre el arte */
.card-signin {
position: relative;
z-index: 1;
border: 0;
border-radius: 10px;
background: rgba(31,41,55,0.9);
box-shadow: 0 8px 20px rgba(0, 0, 0, 0.6);
}


@media (max-width: 768px) {
body::before {
top: -100px;
left: -100px;
height: 300px;
width: 300px;
}

body::after {
bottom: -100px;
right: -100px;
height: 300px;
width: 300px;
}
}

.logo {
max-width: 150px;
border-radius: 15px;
margin-bottom: 10px;
margin-top: -20px;
transform: translateX(-50%);
margin-left: 50%;
padding: 10px;
}

.custom-control-label {
margin-bottom: 0;
margin-top: 1px;
user-select: none;
}

.card-signin {
border: 0;
border-radius: 10px;
background: #1f293785;
box-shadow: 0 8px 20px rgba(0, 0, 0, 0.6);
}

.card-signin .card-header {
font-weight: 300;
font-size: 1.5rem;
border-top-left-radius: 10px;
border-top-right-radius: 10px;
background: #1f2937;
color: #f3f4f6;
}

.login-form-head {
text-align: center;
background: #1f2937;
padding: 30px 15px;
border-bottom: 1px solid #374151;
}

.login-form-head h4 {
letter-spacing: 0;
text-transform: uppercase;
font-weight: 600;
color: #f9fafb;
margin: 0;
}

.card-signin .card-body {
padding: 2rem;
}

.form-signin,
.form-signup {
font-family: 'Poppins', sans-serif;
width: 100%;
text-align: center;
}

.form-signup .btn {
font-size: 14px;
letter-spacing: .1rem;
padding: 12px 20px;
transition: all 0.2s;
background: #2563eb;
color: #fff;
border: none;
border-radius: 8px;
}

.form-signin .form-control,
.form-signup .form-control,
select.form-control {
background: #111827;
border: 1px solid #374151;
color: #f3f4f6;
padding: 12px 20px;
text-align: center;
border-radius: 8px;
height: auto;
}

.form-signin .form-control:focus,
.form-signup .form-control:focus,
select.form-control:focus {
border-color: #2563eb;
box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.3);
outline: none;
}

select.form-control {
height: 51px !important;
}

.custom-control-label:before {
background: #374151;
border-radius: 50% !important;
}