:root {
    --primary-pink: #d66574;
    --highlight-pink: #f8838e;
    --deep-rose: #bd597a;
    --muted-rose: #d2738b;
    --neutral-grey: #aaaaaa;
    --bg-gradient: linear-gradient(135deg, #fdfbfb 0%, #ebedee 100%);
    --font-main: 'Dancing Script', cursive;
}

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

body {
    font-family: var(--font-main);
    background: var(--bg-gradient);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    /* Prevent scrolling initially */
    color: #333;
}

.container {
    width: 100%;
    height: 100%;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Helper Class */
.hidden {
    display: none !important;
    opacity: 0;
    pointer-events: none;
}

/* --- Envelope Styles --- */
.envelope-container {
    cursor: pointer;
    text-align: center;
    animation: float 3s ease-in-out infinite;
    z-index: 10;
    transition: opacity 1s ease, transform 1s ease;
}

.envelope-container.fade-out {
    opacity: 0;
    transform: scale(1.5);
    pointer-events: none;
}

.envelope {
    width: 300px;
    height: 200px;
    background-color: var(--deep-rose);
    position: relative;
    border-radius: 10px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    display: flex;
    justify-content: center;
    align-items: center;
    transition: transform 0.5s ease;
}

.envelope:hover {
    transform: scale(1.05);
}

.envelope.open .flap {
    transform: rotateX(180deg);
    z-index: 1;
    /* Move behind the body/letter when open */
    transition-delay: 0s;
}

.envelope.open .heart-seal {
    opacity: 0;
    transition: opacity 0.2s ease;
}

.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(--primary-pink);
    border-radius: 10px;
    transform-origin: top;
    transition: transform 0.6s ease 0s;
    z-index: 5;
}

.body {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 0;
    border-left: 150px solid var(--muted-rose);
    border-right: 150px solid var(--muted-rose);
    border-bottom: 100px solid var(--deep-rose);
    border-radius: 0 0 10px 10px;
    z-index: 4;
    pointer-events: none;
}

.heart-seal {
    position: absolute;
    top: 60%;
    /* Adjusted for visual balance */
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 50px;
    color: #e91e63;
    z-index: 6;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275), opacity 0.3s;
    animation: heartbeat 1.5s infinite;
    cursor: pointer;
}

@keyframes heartbeat {
    0% {
        transform: translate(-50%, -50%) scale(1);
    }

    15% {
        transform: translate(-50%, -50%) scale(1.15);
    }

    30% {
        transform: translate(-50%, -50%) scale(1);
    }

    45% {
        transform: translate(-50%, -50%) scale(1.15);
    }

    60% {
        transform: translate(-50%, -50%) scale(1);
    }

    100% {
        transform: translate(-50%, -50%) scale(1);
    }
}

.click-instruction {
    margin-top: 40px;
    font-size: 1.4rem;
    color: var(--deep-rose);
    opacity: 0.8;
    animation: pulseText 2s infinite;
    transition: opacity 0.5s;
}

.envelope.open+.click-instruction {
    opacity: 0;
}

@keyframes pulseText {

    0%,
    100% {
        opacity: 0.8;
    }

    50% {
        opacity: 0.4;
    }
}

/* --- Letter Styles --- */
.letter-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    /* Dim background */
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 20;
    opacity: 0;
    transition: opacity 1s ease;
}

.letter-content {
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    animation: unfold 1s forwards ease-in-out;
    perspective: 1000px;
}

.paper {
    background: #fff;
    padding: 30px;
    border-radius: 5px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    font-size: 1.1rem;
    line-height: 1.6;
    overflow-y: auto;
    max-height: 70vh;
    border: 1px solid #eee;
    /* Paper texture effect could go here */
}

#typewriter-text {
    white-space: pre-wrap;
    /* Preserve formatting */
    margin-bottom: 20px;
}

@keyframes unfold {
    0% {
        transform: scaleY(0.1) scaleX(0.1);
        opacity: 0;
    }

    50% {
        transform: scaleY(0.1) scaleX(1);
        opacity: 1;
    }

    100% {
        transform: scaleY(1) scaleX(1);
    }
}

/* --- Question Section --- */
.question-section {
    text-align: center;
    margin-top: 30px;
    opacity: 0;
    transition: opacity 1s ease;
}

.question-section h3 {
    margin-bottom: 20px;
    color: var(--primary-pink);
    font-size: 2rem;
}

.buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.btn {
    padding: 12px 24px;
    font-family: var(--font-main);
    font-size: 1.2rem;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    color: white;
}

.btn-yes {
    background: linear-gradient(45deg, var(--primary-pink), var(--highlight-pink));
    box-shadow: 0 4px 10px rgba(214, 101, 116, 0.4);
}

.btn-no {
    background: var(--neutral-grey);
    box-shadow: 0 4px 10px rgba(170, 170, 170, 0.4);
}

.btn:active {
    transform: scale(0.95);
}

/* --- Celebration Styles --- */
.celebration-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    z-index: 30;
    background: radial-gradient(circle, #fff0f3 0%, #ffe6eb 100%);
}

.love-text {
    font-size: 4rem;
    color: var(--primary-pink);
    text-shadow: 2px 2px 5px rgba(0, 0, 0, 0.1);
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.1);
    }

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

/* Floating Hearts will be added via JS */
.floating-heart {
    position: absolute;
    color: var(--primary-pink);
    animation: floatUp 4s linear backwards;
    opacity: 0;
    pointer-events: none;
}

@keyframes floatUp {
    0% {
        transform: translateY(100vh) scale(0.5);
        opacity: 1;
    }

    100% {
        transform: translateY(-10vh) scale(1.2);
        opacity: 0;
    }
}

/* Background Hearts */
.bg-heart {
    position: absolute;
    color: var(--highlight-pink);
    opacity: 0.1;
    /* Very subtle */
    animation: floatBg 15s linear infinite;
    z-index: 0;
    pointer-events: none;
    font-size: 20px;
}

@keyframes floatBg {
    0% {
        transform: translateY(105vh) rotate(0deg);
        opacity: 0;
    }

    10% {
        opacity: 0.2;
    }

    90% {
        opacity: 0.2;
    }

    100% {
        transform: translateY(-10vh) rotate(360deg);
        opacity: 0;
    }
}

.hearts-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
}