:root {
    --bg-color: #0d0a15;
    --text-color: #ffe6f0;
    --primary-color: #ff4d85;
    --envelope-bg: #ffb3c6;
    --envelope-dark: #ff8fab;
    --envelope-shadow: #ff7aa2;
    --flap-color: #ff9db5;
    --letter-bg: #fff0f5;
    --env-w: 600px;
    --env-h: 340px;
    --env-border-x: 300px;
    --env-border-y: 170px;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Quicksand', sans-serif;
    height: 100vh;
    overflow: hidden;
    position: relative;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    cursor: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='28' height='28' viewBox='0 0 100 100'><text y='.9em' font-size='80'>💖</text></svg>") 14 14, auto;
}

/* FIREFLIES BACKGROUND */
#fireflies {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.firefly {
    position: absolute;
    border-radius: 50%;
    pointer-events: none;
    animation: fireflyDrift linear infinite, fireflyGlow ease-in-out infinite alternate;
}

@keyframes fireflyDrift {
    0% { transform: translate(0, 0); }
    25% { transform: translate(var(--dx1), var(--dy1)); }
    50% { transform: translate(var(--dx2), var(--dy2)); }
    75% { transform: translate(var(--dx3), var(--dy3)); }
    100% { transform: translate(0, 0); }
}

@keyframes fireflyGlow {
    0% { opacity: 0.15; box-shadow: 0 0 4px 1px var(--glow-color); }
    100% { opacity: 0.8; box-shadow: 0 0 12px 4px var(--glow-color); }
}

.firefly-heart {
    position: absolute;
    pointer-events: none;
    font-size: 14px;
    opacity: 0;
    animation: fireflyHeartFloat linear infinite;
}

@keyframes fireflyHeartFloat {
    0% { transform: translateY(0) scale(0.8); opacity: 0; }
    10% { opacity: 0.5; }
    50% { opacity: 0.3; }
    90% { opacity: 0.1; }
    100% { transform: translateY(-100vh) scale(0.4); opacity: 0; }
}

#flower-container,
#photo-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
}

.instruction {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 90%;
    text-align: center;
    font-size: 1.5rem;
    font-weight: 500;
    z-index: 10;
    animation: pulse 2s infinite;
    pointer-events: none;
    color: #ffb3c6;
    text-shadow: 0 0 15px rgba(255, 105, 180, 0.4);
    transition: opacity 0.5s ease;
}

@keyframes pulse {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.8; }
    50% { transform: translate(-50%, -50%) scale(1.05); opacity: 1; }
}

.counter {
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 1.5rem;
    font-weight: bold;
    color: #fff;
    background: rgba(255, 77, 133, 0.4);
    padding: 10px 25px;
    border-radius: 25px;
    z-index: 100;
    pointer-events: none;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    backdrop-filter: blur(5px);
    transition: opacity 0.5s;
    font-family: 'Quicksand', sans-serif;
}

.hidden {
    display: none !important;
    opacity: 0;
    pointer-events: none;
}

/* FLOWERS & PHOTO ICONS */
.flower-emoji,
.photo-icon {
    position: absolute;
    transform: translate(-50%, -50%) scale(0) rotate(0deg);
    animation: popBloom 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
    user-select: none;
    pointer-events: none;
    filter: drop-shadow(0 5px 15px rgba(255, 105, 180, 0.4));
    z-index: 2;
}

.photo-icon {
    pointer-events: auto;
    cursor: pointer;
    z-index: 5;
    transition: filter 0.2s;
}

.photo-icon:hover {
    filter: drop-shadow(0 5px 25px rgba(255, 105, 180, 0.8)) brightness(1.2);
    animation: none;
    transform: translate(-50%, -50%) scale(1.2) rotate(var(--rot));
}

@keyframes popBloom {
    0% { transform: translate(-50%, -50%) scale(0) rotate(calc(var(--rot) - 45deg)); opacity: 0; }
    50% { transform: translate(-50%, -50%) scale(1.1) rotate(calc(var(--rot) + 10deg)); opacity: 1; }
    100% { transform: translate(-50%, -50%) scale(1) rotate(var(--rot)); opacity: 1; }
}


/* ENVELOPE CONTAINER */
#envelope-container {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 20;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
    background: rgba(13, 10, 21, 0.85);
    backdrop-filter: blur(8px);
    opacity: 0;
    animation: fadeIn 1s ease forwards;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.envelope {
    position: relative;
    width: var(--env-w);
    height: var(--env-h);
    background: var(--envelope-bg);
    border-radius: 0 0 10px 10px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.5);
    cursor: pointer;
    transition: transform 0.4s ease;
}

.envelope:hover {
    transform: translateY(-5px);
}

.envelope-front {
    position: absolute;
    width: 100%;
    height: 100%;
    z-index: 3;
    pointer-events: none;
}

.envelope-front::before {
    content: '';
    position: absolute;
    bottom: 0; left: 0;
    width: 0; height: 0;
    border-left: var(--env-border-x) solid var(--envelope-dark);
    border-right: var(--env-border-x) solid var(--envelope-dark);
    border-top: var(--env-border-y) solid transparent;
    border-bottom: var(--env-border-y) solid var(--envelope-dark);
    border-radius: 0 0 10px 10px;
}

.envelope-front::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0;
    width: 0; height: 0;
    border-left: var(--env-border-x) solid transparent;
    border-right: var(--env-border-x) solid transparent;
    border-bottom: var(--env-border-y) solid var(--envelope-shadow);
    border-radius: 0 0 10px 10px;
}

.flap {
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 0;
    border-left: var(--env-border-x) solid transparent;
    border-right: var(--env-border-x) solid transparent;
    border-top: var(--env-border-y) solid var(--flap-color);
    z-index: 4;
    transform-origin: top;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.envelope.open .flap {
    transform: rotateX(180deg);
    z-index: 1;
}

.heart-stamp {
    position: absolute;
    top: calc(var(--env-border-y) - 20px);
    left: 50%;
    transform: translateX(-50%);
    font-size: 40px;
    z-index: 5;
    transition: opacity 0.3s ease;
    filter: drop-shadow(0 2px 5px rgba(0,0,0,0.2));
    animation: heartBeat 1.5s infinite;
}

@keyframes heartBeat {
    0% { transform: translateX(-50%) scale(1); }
    15% { transform: translateX(-50%) scale(1.1); }
    30% { transform: translateX(-50%) scale(1); }
    45% { transform: translateX(-50%) scale(1.1); }
    60% { transform: translateX(-50%) scale(1); }
}

.envelope.open .heart-stamp {
    opacity: 0;
    animation: none;
}

.letter {
    position: absolute;
    width: 560px;
    height: 300px;
    background: var(--letter-bg);
    top: 15px;
    left: 20px;
    z-index: 2;
    padding: 25px 30px;
    border-radius: 8px;
    transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.envelope.open .letter {
    transform: translateY(-200px);
    height: 520px;
    z-index: 5;
    overflow-y: auto;
}

/* Custom scrollbar for letter */
.letter::-webkit-scrollbar {
    width: 6px;
}
.letter::-webkit-scrollbar-thumb {
    background: rgba(255, 77, 133, 0.3);
    border-radius: 3px;
}

#letter-text {
    font-family: 'Dancing Script', cursive;
    font-size: 1.6rem;
    color: #333;
    line-height: 1.5;
    white-space: pre-wrap;
    display: inline;
}

.cursor {
    font-family: 'Quicksand', sans-serif;
    color: var(--primary-color);
    animation: blink 1s infinite;
    font-weight: bold;
    font-size: 1.2rem;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

.sparkle {
    position: absolute;
    background: radial-gradient(circle, #fff, #ffd1dc);
    border-radius: 50%;
    animation: floatUp linear forwards;
    pointer-events: none;
    z-index: 100;
}

@keyframes floatUp {
    0% { transform: translateY(0) scale(1) rotate(0deg); opacity: 1; }
    100% { transform: translateY(-150vh) scale(0) rotate(360deg); opacity: 0; }
}

/* PHOTO MODAL */
.photo-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 200;
    background: rgba(13, 10, 21, 0.9);
    backdrop-filter: blur(12px);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
    cursor: pointer;
}

.photo-modal.active {
    opacity: 1;
    pointer-events: auto;
}

.photo-modal-content {
    text-align: center;
    transform: scale(0.8);
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.photo-modal.active .photo-modal-content {
    transform: scale(1);
}

.photo-modal-content img {
    max-width: 85vw;
    max-height: 70vh;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(255, 77, 133, 0.3), 0 0 80px rgba(255, 105, 180, 0.15);
    border: 4px solid rgba(255, 255, 255, 0.2);
}

.photo-modal-content p {
    font-family: 'Dancing Script', cursive;
    font-size: 1.8rem;
    color: #ffb3c6;
    margin-top: 20px;
    text-shadow: 0 0 15px rgba(255, 105, 180, 0.5);
}

/* CONFETTI */
.confetti {
    position: fixed;
    z-index: 150;
    pointer-events: none;
    animation: confettiFall linear forwards;
}

@keyframes confettiFall {
    0% {
        opacity: 1;
        transform: translateY(0) rotate(0deg) scale(1);
    }
    100% {
        opacity: 0;
        transform: translateY(100vh) rotate(var(--spin)) scale(0.3);
    }
}

/* SECRET HEART EASTER EGG */
.secret-heart {
    cursor: pointer;
    transition: transform 0.2s;
    display: inline-block;
}

.secret-heart:hover {
    transform: scale(1.3);
}

.beating-heart-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 300;
    background: rgba(13, 10, 21, 0.92);
    backdrop-filter: blur(15px);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.6s ease;
    cursor: pointer;
}

.beating-heart-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.big-heart {
    font-size: 150px;
    animation: bigHeartBeat 0.8s ease-in-out infinite;
    filter: drop-shadow(0 0 40px rgba(255, 77, 133, 0.6))
           drop-shadow(0 0 80px rgba(255, 105, 180, 0.3));
    transform: scale(0);
    transition: transform 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.beating-heart-overlay.active .big-heart {
    transform: scale(1);
}

@keyframes bigHeartBeat {
    0% { transform: scale(1); }
    15% { transform: scale(1.15); }
    30% { transform: scale(1); }
    45% { transform: scale(1.15); }
    60% { transform: scale(1); }
}

/* ========== MOBILE RESPONSIVE ========== */
@media (max-width: 768px) {
    :root {
        --env-w: 90vw;
        --env-h: 52vw;
        --env-border-x: 45vw;
        --env-border-y: 26vw;
    }

    .instruction {
        font-size: 1.1rem;
        padding: 0 15px;
    }

    .letter {
        width: calc(90vw - 40px);
        height: calc(52vw - 30px);
        padding: 15px 18px;
    }

    .envelope.open .letter {
        transform: translateY(-45vw);
        height: 70vh;
    }

    #letter-text {
        font-size: 1.2rem;
        line-height: 1.4;
    }

    .heart-stamp {
        font-size: 30px;
    }

    .photo-modal-content img {
        max-width: 92vw;
        max-height: 60vh;
    }

    .photo-modal-content p {
        font-size: 1.3rem;
    }

    .counter {
        font-size: 1.1rem;
        padding: 8px 18px;
    }
}

@media (max-width: 400px) {
    .instruction {
        font-size: 1rem;
    }

    #letter-text {
        font-size: 1rem;
    }

    .letter {
        padding: 12px 14px;
    }

    .heart-stamp {
        font-size: 24px;
    }
}