:root {
    --bg-color: #fcebd5;
    --envelope-color: #f69d3c;
    --envelope-flap: #e88d2d;
    --paper-color: #fffdf0;
    --text-color: #4a4a4a;
    --accent-red: #d00000;
}

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

body {
    background-color: var(--bg-color);
    background-image:
        radial-gradient(#e5cea8 1px, transparent 1px),
        radial-gradient(#e5cea8 1px, transparent 1px);
    background-size: 20px 20px;
    background-position: 0 0, 10px 10px;
    font-family: 'Playfair Display', serif;
    display: flex;
    justify-content: center;
    align-items: center;
    align-items: center;
    min-height: 100vh;
    min-height: 100dvh;
    overflow: hidden;
}

.container {
    perspective: 1000px;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

.envelope-wrapper {
    position: relative;
    cursor: pointer;
    transition: transform 0.6s;
    will-change: transform;
}

.envelope-wrapper:hover {
    transform: scale(1.02);
}

.envelope-wrapper.open {
    cursor: default;
    transform: scale(1);
}

/* Instruction Text */
.instruction {
    text-align: center;
    margin-top: 15px;
    font-family: 'Dancing Script', cursive;
    font-size: 1.5rem;
    color: #888;
    animation: bounce 2s infinite;
}

.envelope-wrapper.open .instruction {
    display: none;
}

@keyframes bounce {

    0%,
    20%,
    50%,
    80%,
    100% {
        transform: translateY(0);
    }

    40% {
        transform: translateY(-10px);
    }

    60% {
        transform: translateY(-5px);
    }
}

.envelope {
    position: relative;
    width: 300px;
    height: 200px;
    background-color: var(--envelope-color);
    border-radius: 0 0 10px 10px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

/* Front Flap (Top) */
.front.flap {
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 0;
    border-left: 150px solid transparent;
    border-right: 150px solid transparent;
    border-top: 110px solid var(--envelope-flap);
    transform-origin: top;
    transform-origin: top;
    transition: transform 0.6s 0.2s, z-index 0.2s;
    will-change: transform;
    z-index: 5;
    border-radius: 5px;
}

/* Pocket (Bottom/Sides) */
.front.pocket {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 0;
    border-left: 150px solid var(--envelope-color);
    border-right: 150px solid var(--envelope-color);
    border-bottom: 110px solid #e08b2c;
    border-radius: 0 0 10px 10px;
    z-index: 4;
    border-top: 90px solid transparent;
}

/* The Letter */
.letter {
    position: absolute;
    top: 10px;
    left: 15px;
    width: 270px;
    height: 180px;
    background-color: var(--paper-color);
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    margin-left: 0;
    /* Explicit start for transition */

    /* 
       Animation Strategy:
       1. Flap opens (0s - 0.6s)
       2. Letter moves UP only (0.6s - 1.1s)
       3. Letter expands and centers (1.1s - 1.7s)
    */
    transition:
        top 0.5s 0.6s ease-in-out,
        z-index 0.1s 0.6s,
        transform 0.6s 1.1s ease-in-out,
        width 0.6s 1.1s ease-in-out,
        left 0.6s 1.1s ease-in-out,
        margin-left 0.6s 1.1s ease-in-out,
        /* Added for mobile centering */
        height 0.6s 1.1s ease-in-out;

    z-index: 1;
    overflow: hidden;
    padding: 20px;
    display: flex;
    flex-direction: column;
}

.letter-content {
    opacity: 0;
    transition: opacity 0.5s 1.8s;
    height: 100%;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.greeting {
    font-weight: bold;
    font-size: 1.2rem;
    margin-bottom: 10px;
    align-self: flex-start;
}

.date {
    font-size: 0.8rem;
    color: #888;
    align-self: flex-end;
    margin-bottom: 10px;
}

.body-text {
    font-family: "Google Sans", sans-serif;
    font-optical-sizing: auto;
    font-style: normal;
    font-size: 1rem;
    line-height: 1.5;
    margin-bottom: 15px;
    text-align: left;
}

.body-text2 {
    font-family: "Google Sans", sans-serif;
    font-style: normal;
    font-size: 1.6rem;
    line-height: 1.5;
    margin-bottom: 10px;
    text-align: center;
}

.question {
    font-family: 'Dancing Script', cursive;
    color: var(--accent-red);
    font-size: 1.8rem;
    margin: 5px 0 15px 0;
    /* Reduced top margin significantly */
}

.photo-clip {
    width: 200px;
    height: 200px;
    background: white;
    padding: 5px;
    box-shadow: 2px 2px 5px rgba(0, 0, 0, 0.2);
    transform: rotate(3deg);
    margin: 5px auto 0 auto;
    /* Reduced margins */
}

.photo-clip img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Buttons */
.buttons {
    display: flex-wrap;
    gap: 15px;
    margin-top: 10px;
    padding-bottom: 10px;
}

.btn {
    padding: 8px 16px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-family: 'Playfair Display', serif;
    font-weight: bold;
    transition: all 0.3s;
}

.yes {
    font-family: "Google Sans", sans-serif;
    font-optical-sizing: auto;
    font-style: normal;
    font-size: 1rem;
    background-color: var(--accent-red);
    color: white;
}

.yes:hover {
    background-color: #a00000;
}

.no {
    font-family: "Google Sans", sans-serif;
    font-optical-sizing: auto;
    font-style: normal;
    font-size: 1rem;
    background-color: #ccc;
    color: #555;
    position: relative;
}

/* Heart Seal */
.heart-seal {
    position: absolute;
    top: 90px;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 3rem;
    color: var(--accent-red);
    z-index: 6;
    transition: opacity 0.4s;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* Animation State: Open */
.envelope-wrapper.open .front.flap {
    transform: rotateX(180deg);
    z-index: 0;
}

.envelope-wrapper.open .heart-seal {
    opacity: 0;
    pointer-events: none;
}

.envelope-wrapper.open .letter {
    /* Step 1: Move Up */
    top: 50%;
    z-index: 10;

    /* Step 2: Expand & Center */
    left: 50%;
    width: 350px;
    height: 78vh;
    max-height: 800px;

    /* True centering */
    transform: translate(-50%, -50%);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
}

.envelope-wrapper.open .letter-content {
    opacity: 1;
}

/* Celebration Overlay */
.celebration {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.95);
    z-index: 100;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.celebration.hidden {
    display: none;
}

.celebration h1 {
    font-family: 'Dancing Script', cursive;
    font-size: 4rem;
    color: var(--accent-red);
}

/* Responsive adjustments */
@media (max-width: 480px) {
    .envelope {
        width: 280px;
    }

    .front.flap {
        border-left-width: 140px;
        border-right-width: 140px;
    }

    .front.pocket {
        border-left-width: 140px;
        border-right-width: 140px;
    }

    .letter {
        width: 250px;
    }

    .envelope-wrapper.open .letter {
        /* Fit in one screen logic with true centering */
        top: 50%;
        /* Center of envelope */
        left: 50%;
        /* Center of envelope */
        width: 90vw;
        height: 78vh;
        max-height: 800px;
        margin-left: 0;
        /* Reset desktop margin logic */

        /*
           Translate (-50%, -50%) moves the element's own center to the top/left coordinates.
           Since top/left are at the envelope's center, the letter becomes centered on the envelope.
        */
        transform: translate(-50%, -50%);
    }

    .question {
        font-size: 1.5rem;
    }

    .celebration h1 {
        font-size: 2.5rem;
    }

    .celebration h1 {
        font-size: 2.5rem;
    }
}

/* Animations moved from JS */
@keyframes shake {
    0% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-5px) rotate(-5deg);
    }

    50% {
        transform: translateX(5px) rotate(5deg);
    }

    75% {
        transform: translateX(-5px) rotate(-5deg);
    }

    100% {
        transform: translateX(0);
    }
}

@keyframes fall {
    to {
        transform: translateY(110vh) rotate(360deg);
    }
}