:root {
    --base-paper: #fff6d1;
    --paper-left: 0.9;
    --paper-right: 0.9;
    --paper-bottom: 1;
    --text-color: #e7a200;
    --speed: 7s;
    --texture-repeat:150vh;
    --texture: url("https://img.freepik.com/free-vector/gradient-golden-linear-background_23-2148957754.jpg");
}

/* https://www.transparenttextures.com/patterns/gray-floral.png */
/* https://wallpaper.dog/large/20364527.jpg */

html{
    scrollbar-gutter: stable;
}

body{
    overflow-x: hidden !important;
}

.envelope-container {
    margin: 0;
    padding: 0;
    z-index: 10000;
    /* width: 100vw; height: 100vh; */
    position: absolute;
    top: 0;
    left: 0;
    overflow: hidden;
    /* background-color: #fffdc6; */
    transition: 2s ease;
    display: flex;
    justify-content: center;
    align-items: center;
    perspective: 1800px; /* Increased perspective for better 3D realism */
    font-family: "Georgia", serif;
}

.invitation-text {
    position: absolute;
    bottom: 12vh;
    width: 100%;
    text-align: center;
    z-index: 6;
    color: var(--theme-burgundy);
    font-family: "Mea Culpa", cursive;
    font-size: 8vh;
    font-style: italic;
    padding: 5px 10px;
    /* text-shadow: 1px 1px 13px #890505; */
    /* background-color: #7f323c; */
    transition: opacity 0.5s;
}

.envelope-wrapper {
    position: relative;
    width: 100vw;
    height: 100vh;
    cursor: pointer;
    transform-style: preserve-3d;
    -webkit-transform-style: preserve-3d;
    perspective: 1800px;
}

/* --- THE BACKGROUND REVEAL CARD --- */
.invitation-card {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9) translateZ(-50px);
    width: 85vw;
    max-width: 500px;
    padding: 40px;
    background: #fff;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8);
    text-align: center;
    z-index: 0;
    opacity: 0;
    transition: all 1s cubic-bezier(0.2, 0.8, 0.2, 1) 0.7s;
}

.envelope-wrapper.open .invitation-card {
    opacity: 1;
    /* Brings it forward slightly as it appears */
    transform: translate(-50%, -50%) scale(1) translateZ(0);
}

.shad{
    filter: drop-shadow(10px 8px 6px rgba(0, 0, 0, 0.4));
}

/* --- THE MOVING BODY SECTION (Bottom Half) --- */
.envelope-main-body {
    position: absolute;
    inset: 0;
    z-index: 0;
    /* Delayed slide down */
    filter: drop-shadow(10px 10px 10px rgba(0, 0, 0, 0.4));
    transition: opacity 2s cubic-bezier(0.7, 0, 0.3, 1) 0.4s;
    transform-style: preserve-3d;
    -webkit-transform-style: preserve-3d;
}

.flap {
    position: absolute;
    background-image: var(--texture);
    background-repeat: auto;
    filter: contrast(0.3) brightness(1.5);
    background-size: var(--texture-repeat);
    pointer-events: none;
}

/* The bottom three flaps */
.flap-left {
    top: 0;
    left: 0;
    width: 50%;
    height: 100%;
    filter: contrast(0.3) brightness(1.5);
    background-color: var(--base-paper);
    clip-path: polygon(0% 0%, 100% 60%, 0% 100%);
    z-index: 1;
    /* box-shadow: inset -20px 0px 60px 20px rgba(0, 0, 0, 0.8); */
    filter: drop-shadow(4px 0 6px rgba(0, 0, 0, 0.1)) contrast(0.2) brightness(1.5);
}
.flap-right {
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background-color: var(--base-paper);
    clip-path: polygon(100% 0%, 100% 100%, 0% 60%);
    z-index: 1;
    /* box-shadow: inset 20px 0px 60px 20px rgba(0, 0, 0, 0.8); */
    filter: drop-shadow(4px 0 6px rgba(0, 0, 0, 0.1)) contrast(0.2) brightness(1.5);
}
.flap-bottom {
    bottom: 0;
    left: 0;
    width: 100%;
    height: 50%;
    background-color: var(--base-paper);
    clip-path: polygon(0% 100%, 40% 0%, 60% 0%, 100% 100%);
    z-index: 2;
    /* filter: drop-shadow(0 -10px 15px rgba(0, 0, 0, 0.15)) contrast(var(--paper-bottom)); */
}

/* --- THE DYNAMIC SHADOW LAYER --- */

/* --- THE TOP LIP & SEAL CONTAINER --- */
.top-lip-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 62%;
    z-index: 10;
    transform-origin: top;
    transition:
        transform var(--speed) cubic-bezier(0.5, 0, 0.2, 1),
        opacity 0.5s ease var(--speed);
    /* transform-style: preserve-3d; */
    /* Crucial: hides the back so it doesn't look upside down at the end */
    /* Force 3D hardware acceleration in Safari */
    -webkit-transform-style: preserve-3d;
    transform-style: preserve-3d;
    -webkit-backface-visibility: hidden; 
    backface-visibility: hidden;
}

.shadow {
    z-index: 4 !important; /* Must be behind the body flaps */
    filter: brightness(0) blur(10px); /* Pitch black and blurry */
    opacity: 0.3;
    height: 62%;
    pointer-events: none;
    /* We only want to animate height and transform independently of the main flap */
    transition:
        height var(--speed) ease-out,
        transform var(--speed) ease-out,
        opacity 1s ease-out;
}

@media only screen and (max-width: 600px) {
  .top-lip-container{
    height: 50%;
  }

  .shadow {
    height: 50%;
  }

  .flap{
    background-size: 120vh;
  }

  .flap-left {
    clip-path: polygon(0% 20%, 100% 40%, 0% 100%);
  }

  .flap-bottom {
   height: 70%;
   clip-path: polygon(100% 100%, 100% 20%, 50% 0%, 0% 20%, 0% 100%);
  }

    .flap-right {
    clip-path: polygon(100% 20%, 100% 100%, 0% 40%);
  }

  .invitation-text {
    bottom: 25vh;
    font-size: 5vh;
  }
}


.top-lip-shape {
    width: 100%;
    height: 100%;
    background-color: var(--base-paper);
    background-image: var(--texture);
    background-size: var(--texture-repeat);
    filter: contrast(0.3) brightness(1.5);
    /* clip-path: polygon(0% 0%, 100% 0%, 50% 100%); */
    clip-path: polygon(100% 0%, 100% 55%, 50% 90%, 0% 55%, 0% 0%);;
    /* No drop-shadow here, we use the dynamic-shadow-overlay instead */
}

.wax-seal-circle {
    position: absolute;
    bottom: -55px;
    left: 50%;
    width: 180px;
    height: 180px;
    margin-left: -90px;
    border-radius: 50%;
    background-image: url("/assets/img/wax-seal-golden-burgundy.png");
    background-color: transparent;
    background-size: cover;
    background-position: center;
    /* box-shadow: 0 5px 10px rgba(0,0,0,0.4); */
    z-index: 12;
    /* FIX: Place it slightly above the paper in 3D space */
    transform: translateZ(2px);
    /* FIX: No independent transition needed, it rides the container */
}

/* --- OPEN STATE ANIMATIONS --- */

.envelope-wrapper.open .top-lip-container {
    /* Rotate 180deg to flip up. scaleY(0) flattens it out of view */
    -webkit-transform: rotateX(120deg);
    transform: rotateX(120deg);
    opacity: 0;
}

.hinge-shadow {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 20px;
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.35), transparent);
    opacity: 1;
    z-index: 8;
    transition: opacity 0.6s ease;
    pointer-events: none;
}

.envelope-wrapper.open .hinge-shadow {
    opacity: 0;
}

/* The shadow fades out as the flap lifts */
.envelope-wrapper.open .dynamic-shadow-overlay {
    opacity: 0;
    transition-duration: 0.8s; /* Fades faster than the flap moves */
}

.envelope-wrapper.open .envelope-main-body {
    /* transform: translateY(105vh); */
    opacity: 0;
}

.envelope-wrapper.open .invitation-text {
    opacity: 0;
}



/* Shadow Animation: Grow and Fade */
.envelope-wrapper.open .shadow {
    height: 100%; /* Grow to 100% height */
    /* opacity: 0;   Fade out */
    /* We stretch it downwards slightly to simulate the shadow moving away */
    transform: scaleY(1.2) translateY(20px);
}