.boton_busqueda {
    display: inline-flex;
    padding: 6px;
    width: 50px;
    align-items: center;
    justify-content: center;
    background: linear-gradient(45deg, #0159b8, #0288d1);
    color: white;
    border-radius: 5px; 
    border-top-right-radius: 15px; 
    border-bottom-right-radius: 15px;
    text-decoration: none;
    font-size: 18px;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
}

.boton_busqueda:hover {
    transform: scale(1.07);
    box-shadow: 0 0 10px rgba(1, 89, 184, 0.7);
    background: linear-gradient(45deg, #0277bd, #039be5);
}
.boton_busqueda:active {
    transform: scale(0.96);
}

/* Tooltip oculto por defecto */
.boton_busqueda .tooltip-text {
    visibility: hidden;
    width: max-content;     
    background-color: #0042889b;
    color: #fff;
    text-align: center;
    padding: 6px 10px;
    border-radius: 4px;
    position: absolute;
    bottom: 125%; /* aparece arriba del botón */
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    opacity: 0;
    transition: opacity 0.3s;
}

/* Flecha del tooltip */
.boton_busqueda .tooltip-text::after {
    content: "";
    position: absolute;
    top: 100%; /* justo debajo del tooltip */
    left: 50%;
    transform: translateX(-50%);
    border-width: 5px;
    border-style: solid;
    border-color: rgba(0, 74, 154, 0.712) transparent transparent transparent; /* flecha negra apuntando hacia abajo */
}

.boton_busqueda:hover .tooltip-text {
    visibility: visible;
    opacity: 1;
}