* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #fff;
    --bg-color: #ffebf2; /* Soft pink background */
    --bg-envelope-color: #ffe3ed; /* Light pink envelope */
    --envelope-tab: #ffccd5; /* Darker pink tab */
    --envelope-cover: #ffc1d1; /* Medium pink cover */
    --shadow-color: rgba(0, 0, 0, 0.2);
    --txt-color:  #003049; /* Deep red text */
    --heart-color: #ff477e; /* Bright pink heart */
}

body {
    background: var(--bg-color);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    height: 100vh;
}

h1 {
    font-family: "Marck Script", serif;
    text-align: center;
    font-size: 60px;
    margin-bottom: 50px;
    color: #444;
}

.container {
    width: 400px;
}

.container > .envelope-wrapper {
    position: relative;
    background-color: var(--bg-envelope-color);
    box-shadow: 0 0 40px var(--shadow-color);
    border-radius: 15px;
}

.envelope-wrapper > .envelope {
    position: relative;
    width: 400px;
    height: 300px;
}

.envelope-wrapper > .envelope::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    z-index: 4;
    border-top: 180px solid var(--envelope-tab);
    border-right: 200px solid transparent;
    border-left: 200px solid transparent;
    transform-origin: top;
    transition: all 0.5s ease-in-out 0.7s;
    border-radius: 10px;
}

.tap-right {
    position: absolute;
    top: 0;
    right: 0;
    width: 100%;
    height: 100%;
    clip-path: polygon(100% 0, 0 100%, 100% 100%);
    transform: rotate(-90deg,90deg);
    border-bottom-right-radius: 10px;
    border-top-right-radius: 10px;
    border-bottom-left-radius: 10px;
    background-color: var(--envelope-cover);
}

.tap-left {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    clip-path: polygon(0 0, 0% 100%, 100% 100%);
    background-color: var(--envelope-cover);
    transform: rotate(90deg, -90deg);
    border-top-left-radius: 10px;
    border-bottom-left-radius: 10px;
    border-bottom-right-radius: 10px;
}
  

.envelope-wrapper.disable-envelope .envelope::before {
    pointer-events: none;
}


.envelope > .letter {
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 100%;
    background: var(--primary);
    text-align: center;
    box-shadow: 0 0 5px var(--shadow-color);
    padding: 20px;
    border-radius: 10px;
    transition: transform .5s ease-in-out;

}

.envelope > .letter > .text {
    font-family: "Gill Sans", "Gill Sans MT", Calibri, "Trebuchet MS", sans-serif;
    color: var(--txt-color);
    text-align: left;
    font-size: 12px;
    border: 3px dotted var(--txt-color);
    padding: 10px;
    height: 100%;
    line-height: 16px;
    cursor: pointer;
    overflow: scroll;
}

.heart {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 30px;
    height: 30px;
    background: var(--heart-color);
    transform: translate(-50%, 0%) rotate(45deg);
    transition: transform 0.5s ease-in-out 1s;
    box-shadow: 0 1px 6px var(--shadow-color);
    cursor: pointer;
    z-index: 999;
}

.heart:before,
.heart:after {
    content: "";
    position: absolute;
    width: 30px;
    height: 30px;
    background-color: var(--heart-color);
    border-radius: 80%;
}

.heart:before {
    top: -15px;
}
  
.heart:after {
    right: 15px;
}

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

.flap > .heart {
    transform: rotate(90deg);
    transition-delay: 0.4s;
}

.letter.letter-opening {
    transform: translateY(-290px);
    transition: transform .5s ease-in-out;
}

.letter.closing-letter {
    transform: translateY(-290px);
    transition: transform .5s ease-in-out;
    z-index: 10000;
}

.letter.opened{
    z-index: 10000;
}

::-webkit-scrollbar {
    width: 8px; 
}

::-webkit-scrollbar-track {
    background: transparent; 
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--envelope-cover); 
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--heart-color); 
}

@media  screen and  (max-width: 400px){
    .container {
        width: 300px;
    }

    
    .envelope-wrapper > .envelope {
        position: relative;
        width: 300px;
        height: 250px;
    }

    .tap-left,
    .tap-right{
        width: 100%;
    }

    
    .envelope-wrapper > .envelope::before {
        border-top: 150px solid var(--envelope-tab);
        border-right: 150px solid transparent;
        border-left: 150px solid transparent;
}

}