body {
    font-family: Arial, Helvetica, sans-serif;
    text-align: center;
    background-color: #f4f6f8;
    margin: 0;
}

h1 {
    margin: 20px 0;
}

/* CONTENEDOR RESPONSIVE */
.contenedor-galeria {
    position: relative;
    width: 70%;
    max-width: 1100px;
    margin: auto;
    background-color: #ffffff;
    padding: 10px;
    border-radius: 18px;
}

/* IMAGEN: SE VE COMPLETA, SIN CORTES */
.contenedor-galeria img {
    width: 100%;
    height: auto;              /* Respeta proporción */
    max-height: none;          /* Nunca corta */
    
    display: block;
    margin: auto;
}

/* ANIMACIÓN SUAVE */
.fade {
    animation: fadeEffect 0.8s ease-in-out;
}

@keyframes fadeEffect {
    from { opacity: 0.3; }
    to { opacity: 1; }
}

/* BOTONES */
.btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    font-size: 36px;
    padding: 18px 24px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    background-color: rgba(33, 150, 243, 0.9);
    color: white;
    box-shadow: 0 6px 14px rgba(0,0,0,0.4);
    transition: transform 0.2s, background-color 0.2s;
}

.btn:hover {
    background-color: rgba(25, 118, 210, 1);
    transform: translateY(-50%) scale(1.15);
}

.btn-izq {
    left: 10px;
}

.btn-der {
    right: 10px;
}

/* CONTADOR */
#contador {
    margin: 15px 0 25px;
    font-weight: bold;
}

/* 📱 CELULARES */
@media (max-width: 600px) {
    .contenedor-galeria {
        width: 95%;
    }

    .contenedor-galeria img {
        max-height: none;
    }
}