body {
    background: url('img/fondo_sistema.webp') no-repeat center center fixed;
    background-size: cover;
    background-attachment: fixed;
    background-color: #f2f2f2; /* color de respaldo */
}

.neu-container {
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.neu-card {
    width: 380px;
    padding: 40px;
    border-radius: 25px;
    background: #e0e5ec;
    box-shadow: 
        10px 10px 30px #c5c9d3,
        -10px -10px 30px #ffffff;
    animation: fadeIn .8s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(15px); }
    to   { opacity: 1; transform: translateY(0); }
}

.neu-label {
    font-weight: 600;
    margin-bottom: 6px;
}

.neu-input-group {
    position: relative;
    display: flex;
    align-items: center;
    background: #e0e5ec;
    border-radius: 15px;
    padding: 12px 15px;
    box-shadow: inset 5px 5px 10px #c5c9d3, inset -5px -5px 10px #ffffff;
}

.neu-input-group input {
    width: 100%;
    border: none;
    background: transparent;
    outline: none;
    font-size: 16px;
}

.neu-icon {
    margin-right: 10px;
    color: #6f7a8a;
    font-size: 20px;
}

.neu-icon-right {
    position: absolute;
    right: 15px;
    cursor: pointer;
    color: #6f7a8a;
    font-size: 20px;
    transition: 0.2s;
}

.neu-icon-right:hover {
    color: #3f51b5;
}

.neu-btn {
    padding: 12px;
    background: #e0e5ec;
    border: none;
    border-radius: 25px;
    box-shadow:
        5px 5px 12px #c5c9d3,
        -5px -5px 12px #ffffff;
    font-size: 16px;
    font-weight: bold;
    color: #3f51b5;
    transition: 0.2s;
}

.neu-btn:hover {
    box-shadow:
        inset 5px 5px 12px #c5c9d3,
        inset -5px -5px 12px #ffffff;
}