body {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-color);
    transition: background 0.3s ease;
}

:root {
    --bg-color: #f0f2f5;
    --card-bg: #ffffff;
    --text-color: #000000;
    --input-bg: #ffffff;
    --input-color: #000000;
    --input-border: #ced4da;
}

.card {
    border-radius: 1rem;
    box-shadow: 0px 0px 20px rgba(0, 0, 0, 0.1);
    padding: 2rem;
    background: var(--card-bg);
    color: var(--text-color);
    transition: background 0.3s ease, color 0.3s ease;
}

.form-control {
    background-color: var(--input-bg);
    color: var(--input-color);
    border-color: var(--input-border);
}

.form-control::placeholder {
    color: #bbb;
}

.logo {
    width: 60%;
    max-width: 300px;
    height: auto;
    margin-bottom: 20px;
}

.theme-toggle {
    position: absolute;
    top: 15px;
    right: 20px;
}

.footer-text {
    color: #6c757d; /* Color gris por defecto de Bootstrap */
}