#mi-interfaz {
    padding: 20px;
    border: 2px solid #333;
    background: #f9f9f9;
    width: 300px;
}
#resultado {
    margin-top: 10px;
    font-weight: bold;
    color: blue;
}

.mi-cuadro {
    border: 3px solid #198754;  /* borde de 3px */
    border-radius: 30px;     /* esquinas redondeadas */
    padding: 40px;
    background: #f9f9f9;
    max-width: 500px;        /* ancho máximo */
    width: 100%;
}

.btn-entrar {
    background: linear-gradient(45deg, #198754, #198754); /* degradado azul */
    color: #fff;
    font-size: 1.2rem;
    font-weight: bold;
    padding: 12px 40px;
    border: none;
    border-radius: 50px; /* bordes redondeados */
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease-in-out;
}

.btn-entrar:hover {
    background: linear-gradient(45deg, #198754, #198754);
    transform: scale(1.05);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
    color: #fff;
}

.btn-entrar:active {
    transform: scale(0.95);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}

/* pestaña */
.nav-tabs .nav-link {
    color: #198754;          /* texto normal */
    border: 2px solid #198754; /* borde de pestaña */
    border-bottom: none;      /* eliminar borde inferior para que se vea conectado con el contenido */
    border-radius: 5px 5px 0 0;
    margin-right: 5px;
}

.nav-tabs .nav-link.active {
    background-color: #198754;
    color: #fff;              /* texto blanco en pestaña activa */
    font-weight: bold;
}

.tab-content {
    border: 2px solid #198754; /* borde del contenido */
    border-radius: 0 5px 5px 5px;
    padding: 20px;
    margin-top: -1px; /* para que el borde quede continuo con la pestaña activa */
}

/* Estilo de las cards */
.card-hover {
    border-radius: 5px; /* bordes redondeados */
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
    flex-direction: column;
}
.card-img-top {
    padding: 10px;
    height: 100px;
    max-width: 80%;
    object-fit: cover;
}

/* Efecto hover */
.card-hover:hover {
    transform: translateY(-10px); /* levanta la card */
    box-shadow: 0 15px 25px rgba(0,0,0,0.3); /* sombra más intensa */
}


/* Card alargada */
.book-card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: 0.5rem;
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
    transition: transform 0.2s, box-shadow 0.2s;
}
.book-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}
.book-card .row > div {
    margin-bottom: 0.25rem;
}