body {
    background: linear-gradient(135deg, #ff9a9e, #fad0c4);
}
h1 {
    animation: latido 2s infinite;
}

.sobre { /* CONTENEDOR SOBRE */
    position: relative;
    overflow: hidden;
    cursor: pointer;
    border-radius: 10px;
}
.sobre .abrir-label {
    position: absolute;
    top: 55%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 2rem;
    font-weight: bold;
    color: #ff4d6d;
    transition: opacity 0.4s ease;
}
.sobre.open .abrir-label {
    opacity: 0;
}
.sobre::before { /* TAPA DEL SOBRE */
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #ff4d6d;
    clip-path: polygon(0 0, 100% 0, 50% 50%);
    transform-origin: top;
    transition: transform 0.8s ease;
    z-index: 2;
}
.sobre.open::before { /* EFECTO AL ABRIR */
    transform: rotateX(180deg);
}
.sobre h1, 
.sobre p { /* CONTENIDO OCULTO AL INICIO */
    opacity: 0;
    transform: translateY(20px);
    transition: all 2s ease;
}
.sobre.open h1,
.sobre.open p { /* CUANDO SE ABRE */
    opacity: 1;
    transform: translateY(0);
}

.galeria-collage-interactivo {
    display: none;
}

.sobre.open ~ .galeria-collage-interactivo {
    display: block;
}

/******************** AMOR Y AMISTAD ****************************/
@keyframes latido {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}
.heart {
    position: absolute;
    bottom: -50px;
    font-size: 24px;
    animation: flotar linear forwards;
}

@keyframes flotar {
    from {
        transform: translateY(0) rotate(var(--rot));
        opacity: 1;
    }
    to {
        transform: translateY(-110vh) rotate(var(--rot));
        opacity: 0.3;
    }
}