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

body {
    font-family: "Quicksand", sans-serif;
    min-height: 100vh;
    background: linear-gradient(160deg, #ffe4ec 0%, #ffd6e8 100%);
    background-attachment: fixed;
    overflow-x: hidden;
}

.envelope {
    animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translate(-50%, -40%);
    }
    to {
        opacity: 1;
        transform: translate(-50%, -50%);
    }
}

/* Yüzen kalpler */
.floating-hearts {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.heart {
    position: absolute;
    font-size: 1.2rem;
    color: rgba(255, 182, 193, 0.5);
    animation: float 12s ease-in-out infinite;
}

.heart-1 { left: 10%; top: 20%; animation-delay: 0s; font-size: 1rem; }
.heart-2 { left: 25%; top: 70%; animation-delay: -2s; font-size: 1.4rem; }
.heart-3 { left: 50%; top: 40%; animation-delay: -4s; font-size: 0.9rem; }
.heart-4 { left: 70%; top: 15%; animation-delay: -6s; font-size: 1.3rem; }
.heart-5 { left: 85%; top: 60%; animation-delay: -8s; font-size: 1.1rem; }
.heart-6 { left: 40%; top: 85%; animation-delay: -10s; font-size: 1rem; }

@keyframes float {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
        opacity: 0.4;
    }
    50% {
        transform: translateY(-25px) rotate(10deg);
        opacity: 0.7;
    }
}

.hint {
    position: fixed;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.85rem;
    color: #c75b7a;
    opacity: 0.9;
    z-index: 5;
    transition: opacity 0.4s ease;
    text-align: center;
    padding: 0 1rem;
}

body.envelope-active .hint {
    opacity: 0;
    pointer-events: none;
}

.envelope.open .card-wrapper { animation: show-card 1000ms 600ms forwards; }
.envelope.open .envelope-lid-secondary {
    transform: rotateX(180deg);
    transition-delay: 100ms;
    animation: open-lid-stacking 500ms forwards;
}
.envelope.open .card { transform: rotateY(-15deg); transition-delay: 1750ms; }
.envelope.open .card-cover { transform: rotateY(-135deg); transition-delay: 2250ms; }
.envelope.open .heart-seal { opacity: 0; }

.card-wrapper {
    perspective: 1000px;
    transform: rotate(-90deg);
}

.card {
    width: 200px;
    height: 300px;
    background: linear-gradient(180deg, #fffbfc 0%, #fff5f7 100%);
    border: 1px solid rgba(255, 182, 193, 0.4);
    transform-style: preserve-3d;
    will-change: transform;
    transition: transform 250ms;
    box-shadow: inset 6px 0 12px rgba(255, 182, 193, 0.15), 0 8px 24px rgba(255, 105, 135, 0.12);
}

.envelope:hover .card {
    transform: rotateY(-15deg);
    transition-delay: 1750ms;
}

.card-cover {
    position: absolute;
    inset: 0;
    text-align: center;
    outline: 1px solid rgba(255, 182, 193, 0.3);
    transform-style: preserve-3d;
    transform-origin: left;
    transition: transform 500ms 0ms;
}

.envelope:hover .card-cover {
    transform: rotateY(-135deg);
    transition-delay: 2250ms;
}

.card-side {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    background: linear-gradient(180deg, #fffbfc 0%, #fff0f5 100%);
    display: grid;
    place-items: center;
}

.card-side-secondary {
    background: linear-gradient(180deg, #fff5f7 0%, #ffe8f0 100%);
    transform: rotateY(180deg);
    box-shadow: inset -6px 0 12px rgba(255, 182, 193, 0.12);
}

.card-title {
    position: relative;
    font-weight: 400;
    text-align: center;
    user-select: none;
    color: #b84d6a;
}

.card-title span {
    display: block;
}

.card-title-secondary {
    font-size: 14px;
    letter-spacing: 4px;
    text-transform: uppercase;
    font-weight: 500;
    color: #c75b7a;
}

.card-title-main {
    font-family: "Petemoss", serif;
    font-size: 52px;
    font-weight: 400;
    color: #b84d6a;
}

.card-title-apostrophe {
    position: absolute;
    top: 28px;
    right: 4px;
    font-size: 10px;
}

.card-body {
    font-family: "Caveat", cursive;
    padding: 18px 16px;
    color: #6b3d4d;
}

.card-body p {
    font-size: 14px;
    font-weight: 500;
}

.card-body p + p {
    margin-top: 12px;
}

.card-body p:first-child {
    font-weight: 600;
    font-size: 18px;
    color: #b84d6a;
}

.card-body .ps {
    margin-top: 14px;
    font-style: italic;
    font-size: 13px;
    color: #c75b7a;
}

.card-body .signature {
    margin-top: 8px;
    font-size: 16px;
    font-weight: 600;
    color: #b84d6a;
    text-align: right;
}

.envelope.open .card,
.envelope:hover .card {
    box-shadow: inset 6px 0 12px rgba(255, 182, 193, 0.15), 0 8px 32px rgba(255, 105, 135, 0.18), 0 0 40px rgba(255, 182, 193, 0.2);
}

.envelope {
    width: 320px;
    height: 210px;
    background: linear-gradient(180deg, #fff8fa 0%, #ffdfeb 100%);
    display: grid;
    place-content: center;
    cursor: pointer;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0 4px 20px rgba(255, 105, 135, 0.2), 0 0 0 1px rgba(255, 182, 193, 0.5);
    z-index: 1;
}

.envelope::after {
    content: '';
    position: absolute;
    inset: 0;
    border-top: 78px solid transparent;
    border-right: 160px solid #fff8fa;
    border-bottom: 132px solid #fff5f8;
    border-left: 160px solid #fff5f8;
}

.envelope:hover .card-wrapper,
.envelope.open .card-wrapper {
    animation: show-card 1000ms 600ms forwards;
}

.envelope:not(:hover):not(.open) .card-wrapper {
    animation: hide-card 1000ms forwards;
}

@keyframes show-card {
    50% {
        transform: translateY(-75%) rotate(-90deg);
        z-index: -1;
    }

    100% {
        transform: translateY(0) rotate(0deg);
        z-index: 10;
    }
}

@keyframes hide-card {
    0% {
        z-index: 10;
        transform: rotate(0deg);
    }

    50% {
        transform: translateY(-75%) rotate(-90deg);
        z-index: -1;
    }

    100% {
        transform: translateY(0) rotate(-90deg);

    }
}

.envelope-lid {
    position: absolute;
    inset: 0;
    z-index: 1;
}

.envelope-lid::before,
.envelope-lid::after {
    content: '';
    position: absolute;
    top: 0;
    width: 1px;
    height: calc(100% - 33px);
    background: linear-gradient(180deg, transparent, rgba(255, 182, 193, 0.5));
}

.envelope-lid::before {
    left: 0;
    transform: rotate(-63.1deg);
    transform-origin: top left;
}

.envelope-lid::after {
    right: 0;
    transform: rotate(63.1deg);
    transform-origin: top right;
}

.envelope-lid-secondary {
    background: linear-gradient(180deg, #ffdfeb 0%, #fff0f5 100%);
    clip-path: polygon(50% 38%, 0 0, 100% 0);
    transition: transform 500ms 1000ms;
    transform-origin: top;
}

.envelope:hover .envelope-lid-secondary {
    transform: rotateX(180deg);
    transition-delay: 100ms;
    animation: open-lid-stacking 500ms forwards;

}

.envelope:not(:hover):not(.open) .envelope-lid-secondary {
    animation: close-lid-stacking 1250ms forwards;
}

@keyframes open-lid-stacking {
    50% {
        z-index: 1;
    }

    100% {
        z-index: -1;
    }
}

@keyframes close-lid-stacking {

    0%,
    50% {
        z-index: -2;

    }

    100% {
        z-index: 1;
    }
}


.heart-seal {
    position: absolute;
    top: 37%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 36px;
    height: 32px; 
    background-image: url("heart-seal.png");
    background-size: cover; 
    background-repeat: no-repeat;
    z-index: 2;
    opacity: 1;
    transition: opacity 2s ease;
}