:is([data-wedding-envelope], .wedding-envelope-overlay) {
    --envelope-ink: #593c44;
    --envelope-rose: #a76570;
    --envelope-paper: #fffaf5;
    --envelope-gold: #c39a68;
    position: fixed;
    z-index: 1200;
    inset: 0;
    display: none;
    place-items: center;
    box-sizing: border-box;
    overflow: hidden;
    padding:
        max(24px, env(safe-area-inset-top, 0px))
        max(20px, env(safe-area-inset-right, 0px))
        max(24px, env(safe-area-inset-bottom, 0px))
        max(20px, env(safe-area-inset-left, 0px));
    color: var(--envelope-ink);
    background:
        radial-gradient(ellipse at 50% 43%, rgba(255, 252, 248, .96), rgba(247, 233, 225, .95) 72%),
        #f4e8e1;
    opacity: 1;
    visibility: visible;
    transition: opacity .48s ease, visibility .48s ease;
    isolation: isolate;
}

:is([data-wedding-envelope], .wedding-envelope-overlay).is-ready {
    display: grid;
}

:is([data-wedding-envelope], .wedding-envelope-overlay):not(.is-ready),
:is([data-wedding-envelope], .wedding-envelope-overlay)[hidden] {
    display: none !important;
}

:is([data-wedding-envelope], .wedding-envelope-overlay)::before,
:is([data-wedding-envelope], .wedding-envelope-overlay)::after {
    position: absolute;
    z-index: -1;
    pointer-events: none;
    content: "";
}

:is([data-wedding-envelope], .wedding-envelope-overlay)::before {
    inset: 18px;
    border: 1px solid rgba(163, 113, 107, .18);
    border-radius: 3px;
}

:is([data-wedding-envelope], .wedding-envelope-overlay)::after {
    inset: 0;
    opacity: .16;
    background-image: repeating-linear-gradient(
        118deg,
        transparent 0,
        transparent 3px,
        rgba(104, 66, 60, .12) 3.5px,
        transparent 4px
    );
    mask-image: linear-gradient(to bottom, transparent, #000 24%, #000 76%, transparent);
}

:is([data-wedding-envelope], .wedding-envelope-overlay).is-opening {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

[data-envelope-scene],
.wedding-envelope-scene {
    position: relative;
    display: grid;
    width: min(100%, 420px);
    justify-items: center;
    gap: clamp(24px, 6vh, 42px);
    text-align: center;
    animation: wedding-envelope-float 4.8s ease-in-out infinite;
}

[data-envelope-heading],
.wedding-envelope-heading {
    margin: 0;
    color: #76545a;
    font-family: "Cormorant Garamond", "Palatino Linotype", Georgia, serif;
    font-size: clamp(1.35rem, 5vw, 1.9rem);
    font-weight: 500;
    letter-spacing: .055em;
    line-height: 1.2;
}

[data-envelope-subtitle],
.wedding-envelope-subtitle {
    margin: -16px 0 0;
    color: #927a76;
    font-family: "DM Sans", "Trebuchet MS", sans-serif;
    font-size: .78rem;
    letter-spacing: .18em;
    line-height: 1.5;
    text-transform: uppercase;
}

[data-envelope],
.wedding-envelope {
    position: relative;
    width: min(82vw, 350px);
    aspect-ratio: 1.58;
    perspective: 1000px;
    filter: drop-shadow(0 23px 26px rgba(87, 53, 52, .17));
}

[data-envelope-back],
.wedding-envelope-back {
    position: absolute;
    inset: 0;
    overflow: hidden;
    border: 1px solid rgba(135, 85, 83, .26);
    border-radius: 8px;
    background: #dbaeb0;
}

[data-envelope-letter],
.wedding-envelope-letter {
    position: absolute;
    z-index: 1;
    inset: 7% 8% 5%;
    display: grid;
    place-items: start center;
    box-sizing: border-box;
    padding: 12% 8% 8%;
    border: 1px solid rgba(177, 147, 120, .34);
    border-radius: 3px;
    color: #76545a;
    background:
        linear-gradient(135deg, rgba(255, 255, 255, .8), transparent 40%),
        var(--envelope-paper);
    box-shadow: 0 2px 8px rgba(91, 58, 51, .08);
    transition: transform .8s cubic-bezier(.2, .76, .25, 1);
}

[data-envelope-letter]::before,
.wedding-envelope-letter::before {
    width: 36px;
    height: 36px;
    border: 1px solid rgba(195, 154, 104, .65);
    border-radius: 50%;
    background:
        radial-gradient(circle at center, #b9787d 0 18%, transparent 19%),
        radial-gradient(circle at 35% 36%, #c58c8c 0 13%, transparent 14%),
        radial-gradient(circle at 65% 36%, #c58c8c 0 13%, transparent 14%),
        #f7e9df;
    box-shadow: 0 2px 5px rgba(83, 49, 47, .12);
    content: "";
}

[data-envelope-flap],
.wedding-envelope-flap {
    position: absolute;
    z-index: 3;
    inset: 0 0 auto;
    height: 58%;
    transform-origin: 50% 0;
    transform: rotateX(0);
    clip-path: polygon(0 0, 100% 0, 50% 100%);
    border: 1px solid rgba(133, 79, 79, .3);
    background: linear-gradient(145deg, #e8c2bc, #d39da1);
    backface-visibility: visible;
    transition: transform .72s cubic-bezier(.2, .76, .25, 1), z-index 0s .36s;
}

[data-envelope-front],
.wedding-envelope-front {
    position: absolute;
    z-index: 2;
    inset: 0;
    overflow: hidden;
    border-radius: 8px;
    clip-path: polygon(0 0, 50% 52%, 100% 0, 100% 100%, 0 100%);
    background: linear-gradient(150deg, #e8c0ba, #d59fa2);
    pointer-events: none;
}

[data-envelope-front]::before,
.wedding-envelope-front::before {
    position: absolute;
    inset: 0;
    background: linear-gradient(34deg, rgba(255, 248, 241, .25), transparent 48%);
    content: "";
}

[data-envelope-seal],
.wedding-envelope-seal {
    position: absolute;
    z-index: 4;
    top: 50%;
    left: 50%;
    display: grid;
    width: 42px;
    aspect-ratio: 1;
    place-items: center;
    transform: translate(-50%, -35%);
    border: 1px solid rgba(255, 245, 228, .75);
    border-radius: 50%;
    color: #fff8ed;
    background: #a76570;
    box-shadow: 0 3px 8px rgba(98, 47, 55, .2);
    font-family: "Cormorant Garamond", Georgia, serif;
    font-size: 1.2rem;
    pointer-events: none;
}

button[data-wedding-open] {
    position: absolute;
    z-index: 5;
    display: inline-flex;
    min-height: 48px;
    align-items: center;
    justify-content: center;
    gap: 10px;
    top: 50%;
    left: 50%;
    padding: 12px 23px;
    border: 1px solid rgba(153, 99, 98, .5);
    border-radius: 999px;
    color: #fffaf5;
    background: linear-gradient(135deg, #a76570, #814a56);
    box-shadow: 0 7px 18px rgba(116, 60, 67, .2);
    font: 600 .88rem/1.2 "DM Sans", "Trebuchet MS", sans-serif;
    letter-spacing: .045em;
    cursor: pointer;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    transform: translate(-50%, -50%);
    transition: background-color .2s ease, box-shadow .2s ease;
}

button[data-wedding-open]::before {
    width: 7px;
    height: 7px;
    transform: rotate(45deg);
    border: 1px solid rgba(255, 244, 228, .85);
    content: "";
}

button[data-wedding-open]:hover {
    background: linear-gradient(135deg, #b5747e, #8c505d);
    box-shadow: 0 10px 22px rgba(116, 60, 67, .25);
}

button[data-wedding-open]:active {
    filter: brightness(.94);
}

button[data-wedding-open]:focus-visible {
    outline: 3px solid var(--envelope-gold);
    outline-offset: 4px;
}

[data-wedding-envelope].is-opened [data-envelope-letter],
[data-wedding-envelope].is-opened .wedding-envelope-letter {
    transform: translateY(-36%) scale(1.02);
}

[data-wedding-envelope].is-opened [data-envelope-flap],
[data-wedding-envelope].is-opened .wedding-envelope-flap {
    z-index: 0;
    transform: rotateX(180deg);
}

[data-wedding-envelope].is-opened [data-envelope-seal],
[data-wedding-envelope].is-opened .wedding-envelope-seal {
    opacity: 0;
    transition: opacity .18s ease;
}

@keyframes wedding-envelope-float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

@media (max-width: 480px) {
    :is([data-wedding-envelope], .wedding-envelope-overlay)::before {
        inset: 12px;
    }

    [data-envelope-scene],
    .wedding-envelope-scene {
        gap: clamp(24px, 5vh, 36px);
    }

    [data-envelope],
    .wedding-envelope {
        width: min(84vw, 340px);
    }

    button[data-wedding-open] {
        min-height: 50px;
        padding-inline: 25px;
        font-size: .92rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    :is([data-wedding-envelope], .wedding-envelope-overlay),
    [data-envelope-letter],
    .wedding-envelope-letter,
    [data-envelope-flap],
    .wedding-envelope-flap,
    [data-envelope-seal],
    .wedding-envelope-seal,
    button[data-wedding-open] {
        scroll-behavior: auto;
        animation: none !important;
        transition-duration: .01ms !important;
    }
}