/* Envelope Styles */
.envelope-wrapper {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    animation: bounceIn 1s ease forwards;
}

@keyframes bounceIn {
    0% {
        transform: scale(0.3);
        opacity: 0;
    }

    50% {
        transform: scale(1.05);
        opacity: 1;
    }

    70% {
        transform: scale(0.9);
    }

    100% {
        transform: scale(1);
        opacity: 1;
    }
}

.envelope {
    position: relative;
    width: 300px;
    height: 200px;
    background-color: #f0f0f0;
    margin-bottom: 2rem;
    transition: transform 0.5s ease;
    cursor: pointer;
}

.envelope::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 0;
    border-top: 100px solid #ddd;
    /* Top flap back color */
    border-right: 150px solid transparent;
    border-left: 150px solid transparent;
    transform-origin: top;
    transition: transform 0.5s 0.5s, z-index 0.2s 0.5s;
    z-index: 5;
}

.envelope.open::before {
    transform: rotateX(180deg);
    z-index: 0;
}

.envelope::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 0;
    border-bottom: 100px solid #ececec;
    /* Bottom flap */
    border-right: 150px solid transparent;
    border-left: 150px solid transparent;
    z-index: 4;
}

.front.flap {
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 0;
    border-top: 100px solid #e0e0e0;
    /* Top flap front color */
    border-right: 150px solid transparent;
    border-left: 150px solid transparent;
    z-index: 6;
    /* Hides letter initially */
    transform-origin: top;
    transition: transform 0.5s 0.5s, z-index 0.2s 0.5s;
}

.envelope.open .front.flap {
    transform: rotateX(180deg);
    z-index: 0;
}


.front.pocket {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: 3;
}

.front.pocket::before,
.front.pocket::after {
    content: '';
    position: absolute;
    bottom: 0;
    width: 0;
    height: 0;
    border-bottom: 100px solid #e6e6e6;
    /* Side flaps */
    border-top: 100px solid transparent;
    z-index: 3;
}

.front.pocket::before {
    left: 0;
    border-left: 0 solid transparent;
    border-right: 150px solid transparent;
    border-bottom-color: #e6e6e6;
}

.front.pocket::after {
    right: 0;
    border-right: 0 solid transparent;
    border-left: 150px solid transparent;
    border-bottom-color: #d9d9d9;
}


.letter {
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    width: 90%;
    height: 90%;
    background-color: white;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    z-index: 2;
    transition: transform 0.5s 1s ease-out;
    /* Delay until open */
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

.envelope.open .letter {
    transform: translateX(-50%) translateY(-100px);
    z-index: 7;
    /* Initial z-index change to appear above envelope */
    transition: transform 0.8s 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.letter .heart {
    color: #e52e71;
    font-size: 3rem;
    animation: beat 1s infinite alternate;
}

.letter .text {
    margin-top: 0.5rem;
    font-family: 'Courier New', Courier, monospace;
    color: #333;
    font-size: 1.2rem;
    font-weight: bold;
}

@keyframes beat {
    from {
        transform: scale(1);
    }

    to {
        transform: scale(1.2);
    }
}

#open-btn {
    padding: 1rem 2rem;
    font-size: 1.5rem;
    background: linear-gradient(to right, #ff8a00, #e52e71);
    color: white;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(229, 46, 113, 0.4);
    transition: transform 0.2s, box-shadow 0.2s;
    font-family: "JetBrainsMono", monospace;
    outline: none;
    animation: pulse 2s infinite;
}

#open-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 20px rgba(229, 46, 113, 0.6);
}

#open-btn:active {
    transform: scale(0.95);
}

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(229, 46, 113, 0.4);
    }

    70% {
        box-shadow: 0 0 0 20px rgba(229, 46, 113, 0);
    }

    100% {
        box-shadow: 0 0 0 0 rgba(229, 46, 113, 0);
    }
}