body {
    margin: 0;
    padding: 0;
    height: 100vh;
    background: radial-gradient(circle at center, #1a2a4f 0%, #0b1224 70%);
    font-family: "Georgia", serif;
    color: #cfd8ff;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;

    animation: fadeIn 3s ease-in-out;
}

/* Título principal */
h1 {
    font-size: 70px;
    margin: 0;
    color: #9bbcff;
    text-shadow: 0 0 20px rgba(100, 150, 255, 0.4);
    opacity: 0.85;
}

/* Subtítulo */
h2 {
    font-weight: normal;
    margin-top: 10px;
    color: #7f9bd9;
    opacity: 0.6;
    letter-spacing: 1px;
}

/* Audio minimalista y oscuro */
audio {
    margin-top: 40px;
    filter: hue-rotate(180deg) brightness(0.8) contrast(1.2);
    opacity: 0.7;
}

/* Transición lenta tipo recuerdo */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Oscurecimiento progresivo leve */
body::after {
    content: "";
    position: absolute;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, transparent 60%, rgba(0,0,0,0.5) 100%);
    pointer-events: none;
}
.back-btn {
    margin-top: 40px;
    padding: 10px 25px;
    font-family: "Georgia", serif;
    font-size: 16px;
    background-color: transparent;
    color: #9bbcff;
    border: 1px solid #7f9bd9;
    cursor: pointer;
    opacity: 0.6;
    transition: 0.3s ease;
}

.back-btn:hover {
    opacity: 1;
    background-color: rgba(100, 150, 255, 0.1);
}