.music-toggle {
    position: fixed;
    right: 16px;
    bottom: 76px;
    z-index: 120;
    display: grid;
    place-items: center;
    width: 46px;
    height: 46px;
    border: 1px solid #343B29;
    border-radius: 50%;
    background: #efefef;
    color: #343B29;
    font: 22px/1 Arial, sans-serif;
    letter-spacing: 0;
    cursor: pointer;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.16);
    transition: transform 180ms ease, background-color 180ms ease, color 180ms ease;
}

.music-consent {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 24px;
    padding: 24px;
    box-sizing: border-box;
    overflow: hidden;
    background: #343B29;
    color: #efefef;
    opacity: 0;
    visibility: hidden;
    transition: opacity 1200ms ease, visibility 1200ms ease;
}

.music-consent[hidden] {
    display: none;
}

.music-consent-open {
    overflow: hidden;
}

.music-consent.is-visible {
    opacity: 1;
    visibility: visible;
    transition: none;
}

.letter-scene {
    position: relative;
    width: min(520px, calc(100vw - 64px));
    height: 400px;
    perspective: 1200px;
}

.letter-envelope {
    position: absolute;
    right: 0;
    bottom: 0;
    left: 0;
    height: 280px;
    overflow: hidden;
    filter: drop-shadow(0 18px 24px rgba(0, 0, 0, 0.18));
}

.letter-envelope__back {
    position: absolute;
    inset: 0;
    z-index: 1;
    border: 1px solid #929989;
    background: #cfd2c8;
}

.letter-card {
    position: absolute;
    right: 7%;
    bottom: 20px;
    left: 7%;
    z-index: 2;
    height: 228px;
    padding: 36px 28px;
    border: 1px solid #b9bdb2;
    background: #efefef;
    color: #343B29;
    text-align: center;
    transform: translateY(16px) scale(0.97);
    transform-origin: center bottom;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.14);
}

.letter-card__caption,
.letter-card__date {
    display: block;
    font: 14px/1.4 "SMTextsFont", sans-serif;
    letter-spacing: 0;
    text-transform: uppercase;
}

.letter-card__caption,
.letter-card__names,
.letter-card__date {
    opacity: 0;
}

.letter-card__names {
    display: block;
    margin: 28px 0;
    font: 44px/1.1 "SMHeadersFont", serif;
    letter-spacing: 0;
    text-transform: uppercase;
}

.letter-envelope__flap {
    position: absolute;
    inset: 0 0 auto;
    z-index: 5;
    height: 184px;
    background: #d9dbd3;
    clip-path: polygon(0 0, 100% 0, 50% 100%);
    transform-origin: center top;
    backface-visibility: hidden;
}

.letter-envelope__front {
    position: absolute;
    inset: 0;
    z-index: 4;
    border: 1px solid #929989;
    background: #b8bdae;
    clip-path: polygon(0 24%, 50% 68%, 100% 24%, 100% 100%, 0 100%);
}

.letter-envelope__seal {
    position: absolute;
    top: 118px;
    left: 50%;
    z-index: 6;
    display: grid;
    place-items: center;
    width: 58px;
    height: 58px;
    border: 1px solid #efefef;
    border-radius: 50%;
    background: #343B29;
    color: #efefef;
    font: 15px/1 "SMHeadersFont", serif;
    letter-spacing: 0;
    transform: translateX(-50%);
}

.music-consent.is-opening .letter-envelope__flap {
    animation: envelope-flap-open 650ms cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.music-consent.is-releasing .letter-envelope {
    overflow: visible;
}

.music-consent.is-opening .letter-card {
    animation: letter-rise 900ms 450ms cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.music-consent.is-opening .letter-card__caption,
.music-consent.is-opening .letter-card__names,
.music-consent.is-opening .letter-card__date {
    animation: letter-content-show 420ms 700ms ease forwards;
}

.music-consent.is-opening .letter-envelope__seal,
.music-consent.is-opening .music-consent__button {
    pointer-events: none;
    animation: letter-control-hide 240ms ease forwards;
}

@keyframes envelope-flap-open {
    0% {
        z-index: 5;
        transform: rotateX(0deg);
    }
    49% {
        z-index: 5;
    }
    50%,
    100% {
        z-index: 1;
        transform: rotateX(180deg);
    }
}

@keyframes letter-rise {
    0% {
        transform: translateY(16px) scale(0.97);
    }
    100% {
        transform: translateY(-132px) scale(1);
    }
}

@keyframes letter-control-hide {
    to {
        opacity: 0;
    }
}

@keyframes letter-content-show {
    to {
        opacity: 1;
    }
}

.music-consent__button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    min-height: 50px;
    padding: 0 24px;
    border: 1px solid #efefef;
    border-radius: 5px;
    background: transparent;
    color: #efefef;
    font: 16px/1.2 "SMTextsFont", sans-serif;
    letter-spacing: 0;
    cursor: pointer;
}

.music-consent__button:hover {
    background: #efefef;
    color: #343B29;
}

.music-consent__button:focus-visible {
    outline: 2px solid #efefef;
    outline-offset: 4px;
}

.music-toggle:hover {
    transform: translateY(-2px);
}

.music-toggle:focus-visible {
    outline: 2px solid #efefef;
    outline-offset: 3px;
}

.music-toggle.is-playing {
    background: #343B29;
    color: #efefef;
}

@media (min-width: 501px) {
    .music-toggle {
        right: 24px;
        bottom: 24px;
    }
}

@media (max-width: 500px) {
    .music-consent {
        padding: 16px;
    }

    .letter-scene {
        width: 100%;
        max-width: 390px;
        height: 320px;
    }

    .music-consent__button {
        max-width: 100%;
    }

    .letter-envelope {
        height: 220px;
    }

    .letter-card {
        right: 6%;
        bottom: 16px;
        left: 6%;
        height: 184px;
        padding: 28px 18px;
        transform: translateY(14px) scale(0.97);
    }

    .letter-card__names {
        margin: 21px 0;
        font-size: 34px;
    }

    .letter-envelope__flap {
        height: 145px;
    }

    .letter-envelope__seal {
        top: 91px;
        width: 50px;
        height: 50px;
        font-size: 13px;
    }

    @keyframes letter-rise {
        0% {
            transform: translateY(14px) scale(0.97);
        }
        100% {
            transform: translateY(-104px) scale(1);
        }
    }
}

@media (prefers-reduced-motion: reduce) {
    .music-toggle,
    .music-consent {
        transition: none;
    }

    .music-consent.is-opening .letter-envelope__flap,
    .music-consent.is-opening .letter-card,
    .music-consent.is-opening .letter-card__caption,
    .music-consent.is-opening .letter-card__names,
    .music-consent.is-opening .letter-card__date,
    .music-consent.is-opening .letter-envelope__seal,
    .music-consent.is-opening .music-consent__button {
        animation-duration: 1ms;
        animation-delay: 0ms;
    }

    .music-consent.is-releasing .letter-envelope {
        overflow: visible;
    }
}