.premium-envelope {
    position: relative;
    width: 100%;
    max-width: 100%;
    aspect-ratio: 1.42;
    margin-inline: auto;
    perspective: 90rem;
    transform-style: preserve-3d;
}

.premium-envelope__shadow {
    position: absolute;
    width: 82%;
    height: 13%;
    right: 9%;
    bottom: -3%;
    border-radius: 50%;
    opacity: 0.34;
    filter: blur(1.1rem);
    background: rgba(45, 53, 37, 0.42);
    transform: translateZ(-3rem);
}

.premium-envelope__scene {
    position: relative;
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
}

.premium-envelope__back {
    position: absolute;
    inset: 0;
    z-index: 1;
    overflow: hidden;
    border-radius: 1rem;
    background: linear-gradient( 145deg, var(--olive-500), var(--olive-700) );
    box-shadow: 0 1.6rem 4rem rgba(48, 57, 40, 0.21);
}

.premium-envelope__interior {
    position: absolute;
    inset: 0.7rem;
    overflow: hidden;
    border-radius: 0.6rem;
    background: linear-gradient( 145deg, #536044, #414b36 );
}

.premium-envelope__interior-pattern {
    position: absolute;
    inset: 0;
    opacity: 0.18;
    background-image: repeating-linear-gradient( 45deg, transparent 0, transparent 0.55rem, rgba(255, 255, 255, 0.12) 0.55rem, rgba(255, 255, 255, 0.12) 0.62rem );
}

.premium-envelope__flap {
    position: absolute;
    z-index: 4;
    width: 100%;
    height: 56%;
    top: 0;
    left: 0;
    transform-origin: 50% 0%;
    transform-style: preserve-3d;
    backface-visibility: visible;
}

.premium-envelope__flap-face {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    transform-style: preserve-3d;
}

.premium-envelope__flap-face--front {
    z-index: 2;
}

.premium-envelope__flap-face--back {
    z-index: 1;
    transform: rotateX(180deg);
    clip-path: polygon(0 0, 100% 0, 53% 92%, 50% 100%, 47% 92%);
    background: linear-gradient( 165deg, #49543c 0%, #5a6649 55%, #6a7753 100% );
    box-shadow: inset 0 0 0 1px rgba(255,255,255,0.06), 0 0.8rem 1.8rem rgba(42, 50, 35, 0.14);
}

.premium-envelope__flap-svg {
    width: 100%;
    height: 100%;
    display: block;
    overflow: visible;
}

.premium-envelope__front {
    position: absolute;
    inset: 0;
    z-index: 5;
    overflow: hidden;
    border-radius: 1rem;
    filter: drop-shadow(0 1.2rem 2rem rgba(41, 49, 34, 0.18));
}

.premium-envelope__front-svg {
    width: 100%;
    height: 100%;
    display: block;
}

.premium-envelope__paper-texture {
    position: absolute;
    inset: 0;
    opacity: 0.18;
    mix-blend-mode: soft-light;
    pointer-events: none;
    background-image: repeating-radial-gradient( circle at 0 0, rgba(255, 255, 255, 0.25) 0, rgba(255, 255, 255, 0.25) 1px, transparent 1px, transparent 5px );
    background-size: 8px 8px;
}

.premium-envelope__address {
    position: absolute;
    z-index: 2;
    display: flex;
    left: 50%;
    bottom: 17%;
    flex-direction: column;
    align-items: center;
    color: rgba(248, 245, 238, 0.68);
    transform: translateX(-50%);
}

.premium-envelope__address-small {
    font-family: var(--font-heading);
    font-size: clamp(0.7rem, 2.3vw, 0.9rem);
    font-style: italic;
    letter-spacing: 0.06em;
}

.premium-envelope__address-line {
    width: clamp(4rem, 17vw, 6.4rem);
    height: 1px;
    margin-top: 0.45rem;
    background: linear-gradient( 90deg, transparent, rgba(248, 245, 238, 0.5), transparent );
}

.premium-envelope__seal-holder {
    position: absolute;
    z-index: 7;
    top: 51%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.premium-envelope[data-envelope-state="closed"]
.envelope-letter {
    z-index: 2;
}

.premium-envelope[data-envelope-state="closed"]
.premium-envelope__flap {
    z-index: 4;
}

.premium-envelope[data-envelope-state="closed"]
.premium-envelope__front {
    z-index: 5;
}

.premium-envelope[data-envelope-state="closed"]
.premium-envelope__seal-holder {
    z-index: 7;
}

@media (max-width: 30rem) {
    .premium-envelope {
        width: min(100%, 25rem);
    }

    .premium-envelope__back,
    .premium-envelope__front {
        border-radius: 0.75rem;
    }

    .premium-envelope[data-envelope-state="opened"]
    .premium-envelope__flap {
        transform: scaleY(-1) !important;
        transform-origin: 50% 0%;
    }

    .premium-envelope[data-envelope-state="opened"]
    .premium-envelope__flap-face--back {
        visibility: hidden;
    }
}

@media (max-width: 30rem) {

    .premium-envelope__seal-holder {
        top: 51%;
        left: 50%;
        transform: translate(-50%, -50%);
    }
}

@media (min-width: 48rem) {
    .premium-envelope {
        width: min(100%, 32rem);
    }
}

@media (prefers-reduced-motion: reduce) {
    .premium-envelope *,
    .premium-envelope *::before,
    .premium-envelope *::after {
        animation: none !important;
        transition: none !important;
    }
}

.premium-envelope__scene,
.premium-envelope__flap,
.premium-envelope__front,
.premium-envelope__seal-holder,
.envelope-letter {
    will-change: transform, opacity;
}

.premium-envelope[data-envelope-state="opening"] {
    pointer-events: none;
}

    .premium-envelope[data-envelope-state="opening"]
    .wax-seal,
    .premium-envelope[data-envelope-state="opened"]
    .wax-seal {
        pointer-events: none;
    }

.premium-envelope[data-envelope-state="opened"]
.premium-envelope__flap {
    z-index: 1;
    transform: rotateX(-175deg);
}

.premium-envelope[data-envelope-state="opened"]
.envelope-letter {
    z-index: 7;
    transform: none !important;
}

.premium-envelope[data-envelope-state="opened"]
.premium-envelope__scene {
    top: 0.5rem;
    transform: none !important;
}

.premium-envelope[data-envelope-state="opened"]
.premium-envelope__seal-holder {
    visibility: hidden;
}

.premium-envelope[data-envelope-state="opened"]
.premium-envelope__front {
    z-index: 5;
}

.premium-envelope[data-envelope-state="opened"]
.premium-envelope__shadow {
    opacity: 0.24;
}