/* Envelope Animation Styles */

#envelope-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--envelope-bg);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10000;
    transition: opacity 1.5s ease-out;
}

#envelope-container.fade-out {
    opacity: 0;
    pointer-events: none;
}

#envelope-container.zoom-in {
    animation: zoomIn 1.5s ease-in-out forwards;
}

@keyframes zoomIn {
    0% {
        transform: scale(1);
        opacity: 1;
    }
    100% {
        transform: scale(3);
        opacity: 0;
    }
}

/* Floating particles background */
#envelope-container::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background-image:
        radial-gradient(2px 2px at 20% 30%, rgba(255, 255, 255, 0.3), transparent),
        radial-gradient(2px 2px at 60% 70%, rgba(212, 175, 55, 0.2), transparent),
        radial-gradient(1px 1px at 50% 50%, rgba(255, 255, 255, 0.2), transparent),
        radial-gradient(1px 1px at 80% 10%, rgba(212, 175, 55, 0.3), transparent),
        radial-gradient(2px 2px at 90% 60%, rgba(255, 255, 255, 0.2), transparent);
    background-size: 200% 200%;
    animation: sparkle 15s ease-in-out infinite;
}

@keyframes sparkle {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.envelope-wrapper {
    perspective: 2000px;
    width: 90%;
    max-width: 550px;
    position: relative;
    z-index: 1;
    transition: transform 0.4s ease;
    animation: envelopeWiggle 3s ease-in-out infinite;
}

/* "You have mail" wiggle animation */
@keyframes envelopeWiggle {
    0%, 100% {
        transform: rotate(0deg);
    }
    15% {
        transform: rotate(-1.5deg) translateY(-2px);
    }
    30% {
        transform: rotate(1.5deg) translateY(-1px);
    }
    45% {
        transform: rotate(-1deg) translateY(-2px);
    }
    60% {
        transform: rotate(1deg);
    }
    75% {
        transform: rotate(-0.5deg);
    }
    85% {
        transform: rotate(0deg);
    }
}

/* Stop animation when envelope is opening */
.envelope-wrapper.opening {
    animation: none;
}

.envelope {
    position: relative;
    width: 100%;
    aspect-ratio: 1.6 / 1;
    transform-style: preserve-3d;
    filter: drop-shadow(0 25px 50px rgba(0, 0, 0, 0.35));
}

/* Envelope body - main rectangular area (the back of the envelope) */
.envelope-body {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--envelope-color, #f5e6d3);
    border-radius: 4px;
    box-shadow:
        inset 0 0 0 1px rgba(0, 0, 0, 0.06),
        inset 0 -40px 60px -30px rgba(0, 0, 0, 0.08);
    overflow: hidden;
}

/* Paper texture on envelope body */
.envelope-body::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%' height='100%' filter='url(%23noise)'/%3E%3C/svg%3E");
    opacity: 0.03;
    pointer-events: none;
    mix-blend-mode: multiply;
}

/* Inner liner pattern (visible inside the envelope) */
.envelope-body::after {
    content: '';
    position: absolute;
    top: 5%;
    left: 5%;
    width: 90%;
    height: 45%;
    background:
        linear-gradient(135deg, rgba(180, 140, 100, 0.08) 25%, transparent 25%),
        linear-gradient(-135deg, rgba(180, 140, 100, 0.08) 25%, transparent 25%),
        linear-gradient(45deg, rgba(180, 140, 100, 0.08) 25%, transparent 25%),
        linear-gradient(-45deg, rgba(180, 140, 100, 0.08) 25%, transparent 25%);
    background-size: 20px 20px;
    opacity: 0.5;
    pointer-events: none;
    border-radius: 2px;
}

/* Envelope folds container */
.envelope-folds {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
    border-radius: 4px;
}

/* Left fold triangle - the left inner flap */
.fold-left {
    position: absolute;
    left: 0;
    top: 0;
    width: 35%;
    height: 100%;
    background: linear-gradient(to right,
        var(--envelope-color, #f5e6d3) 0%,
        color-mix(in srgb, var(--envelope-color, #f5e6d3) 95%, #000) 100%
    );
    clip-path: polygon(0 0, 100% 50%, 0 100%);
    z-index: 2;
    box-shadow: inset -5px 0 15px rgba(0, 0, 0, 0.1);
}

/* Left fold shadow line */
.fold-left::after {
    content: '';
    position: absolute;
    right: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to left, rgba(0, 0, 0, 0.15) 0%, transparent 30%);
    clip-path: polygon(0 0, 100% 50%, 0 100%);
}

/* Right fold triangle - the right inner flap */
.fold-right {
    position: absolute;
    right: 0;
    top: 0;
    width: 35%;
    height: 100%;
    background: linear-gradient(to left,
        var(--envelope-color, #f5e6d3) 0%,
        color-mix(in srgb, var(--envelope-color, #f5e6d3) 95%, #000) 100%
    );
    clip-path: polygon(100% 0, 0 50%, 100% 100%);
    z-index: 2;
    box-shadow: inset 5px 0 15px rgba(0, 0, 0, 0.1);
}

/* Right fold shadow line */
.fold-right::after {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to right, rgba(0, 0, 0, 0.15) 0%, transparent 30%);
    clip-path: polygon(100% 0, 0 50%, 100% 100%);
}

/* Bottom fold triangle - the bottom flap that holds the letter */
.fold-bottom {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 70%;
    background: linear-gradient(to top,
        var(--envelope-color, #f5e6d3) 0%,
        color-mix(in srgb, var(--envelope-color, #f5e6d3) 97%, #000) 60%,
        color-mix(in srgb, var(--envelope-color, #f5e6d3) 92%, #000) 100%
    );
    clip-path: polygon(0 100%, 50% 15%, 100% 100%);
    z-index: 3;
}

/* Bottom fold top edge shadow */
.fold-bottom::before {
    content: '';
    position: absolute;
    top: 15%;
    left: 0;
    width: 100%;
    height: 20%;
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.12), transparent);
    clip-path: polygon(0 100%, 50% 0, 100% 100%);
}

/* Bottom fold texture */
.fold-bottom::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%' height='100%' filter='url(%23noise)'/%3E%3C/svg%3E");
    opacity: 0.025;
    pointer-events: none;
    mix-blend-mode: multiply;
    clip-path: polygon(0 100%, 50% 15%, 100% 100%);
}

/* Top flap (closed state) - the main flap that opens */
.envelope-flap-closed {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 60%;
    background: linear-gradient(to bottom,
        var(--envelope-color, #f5e6d3) 0%,
        color-mix(in srgb, var(--envelope-color, #f5e6d3) 96%, #000) 70%,
        color-mix(in srgb, var(--envelope-color, #f5e6d3) 92%, #000) 100%
    );
    clip-path: polygon(0 0, 100% 0, 50% 100%);
    transform-origin: top center;
    transition: transform 0.8s ease-in-out, opacity 0.4s ease;
    z-index: 10;
}

/* Paper texture on flap */
.envelope-flap-closed::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%' height='100%' filter='url(%23noise)'/%3E%3C/svg%3E");
    opacity: 0.03;
    pointer-events: none;
    mix-blend-mode: multiply;
}

/* Shadow at the bottom of the flap (where it meets the envelope) */
.envelope-flap-closed::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 40%;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.15), transparent);
    clip-path: polygon(0 100%, 50% 0, 100% 100%);
    pointer-events: none;
}

/* Flap opening animation - smooth and natural */
.envelope-flap-closed.open {
    animation: flapOpen 0.7s ease-out forwards;
}

@keyframes flapOpen {
    0% {
        transform: rotateX(0deg);
    }
    100% {
        transform: rotateX(-180deg);
    }
}

/* Letter inside - starts hidden inside envelope, face UP (front visible) */
.letter {
    position: absolute;
    top: 8%;
    left: 8%;
    width: 84%;
    height: 80%;
    z-index: 5;
    opacity: 0;
    transform: translateY(0) translateZ(0) scale(1) rotateY(0deg);
    transform-style: preserve-3d;
    pointer-events: none;
}


/* Letter front (with names) */
.letter-front {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--letter-bg);
    border-radius: 3px;
    box-shadow:
        0 15px 50px rgba(0, 0, 0, 0.3),
        inset 0 0 0 1px rgba(0, 0, 0, 0.05);
    backface-visibility: hidden;
    overflow: hidden;
}

/* Paper texture on letter front */
.letter-front::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%' height='100%' filter='url(%23noise)'/%3E%3C/svg%3E");
    opacity: 0.025;
    pointer-events: none;
    mix-blend-mode: multiply;
    border-radius: 3px;
}

/* Letter back (decorative) - this is what user sees before zoom */
.letter-back {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--letter-bg);
    border-radius: 3px;
    box-shadow:
        0 15px 50px rgba(0, 0, 0, 0.3),
        inset 0 0 0 1px rgba(0, 0, 0, 0.05);
    backface-visibility: hidden;
    transform: rotateY(180deg);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

/* Decorative border on back of letter */
.letter-back::before {
    content: '';
    position: absolute;
    inset: 6%;
    border: 2px solid var(--primary-accent);
    border-radius: 2px;
    opacity: 0.4;
}

/* Wax seal imprint on back */
.letter-back-seal {
    width: 90px;
    height: 90px;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%,
        var(--primary-accent) 0%,
        color-mix(in srgb, var(--primary-accent) 70%, #000) 100%
    );
    opacity: 0.25;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: 'Playfair Display', serif;
    font-size: 2.2rem;
    color: var(--secondary-accent);
    box-shadow: inset 0 2px 4px rgba(255,255,255,0.2),
                inset 0 -2px 4px rgba(0,0,0,0.2);
}

/* Corner flourishes on back */
.letter-back::after {
    content: '❧';
    position: absolute;
    bottom: 10%;
    right: 10%;
    font-size: 1.8rem;
    color: var(--primary-accent);
    opacity: 0.25;
}

.letter-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 15px;
    box-sizing: border-box;
}

/* Phase 1: Letter rises from envelope - face UP (front showing) */
.letter.rising {
    z-index: 25;
    animation: letterRise 0.8s ease-out forwards;
}

@keyframes letterRise {
    0% {
        opacity: 0;
        transform: translateY(0) translateZ(0) scale(1) rotateY(0deg);
    }
    30% {
        opacity: 1;
        transform: translateY(-30px) translateZ(80px) scale(1) rotateY(0deg);
    }
    100% {
        opacity: 1;
        transform: translateY(-90px) translateZ(150px) scale(1.05) rotateY(0deg);
    }
}

/* State after rise completes - hold position */
.letter.risen {
    z-index: 25;
    opacity: 1;
    transform: translateY(-90px) translateZ(150px) scale(1.05) rotateY(0deg);
}

/* Phase 2: Letter flips to show BACK (user checks the back of letter) */
.letter.flipping {
    z-index: 25;
    opacity: 1;
    animation: letterFlipToBack 0.7s ease-in-out forwards;
}

@keyframes letterFlipToBack {
    0% {
        transform: translateY(-90px) translateZ(150px) scale(1.05) rotateY(0deg);
    }
    100% {
        transform: translateY(-90px) translateZ(150px) scale(1.05) rotateY(180deg);
    }
}

/* State after flip completes - hold position showing back */
.letter.flipped {
    z-index: 25;
    opacity: 1;
    transform: translateY(-90px) translateZ(150px) scale(1.05) rotateY(180deg);
}

/* Phase 3: Zoom into the letter back (draws user in) */
.letter.zooming {
    z-index: 25;
    opacity: 1;
    animation: letterZoomIn 1s ease-in forwards;
}

@keyframes letterZoomIn {
    0% {
        transform: translateY(-90px) translateZ(150px) scale(1.05) rotateY(180deg);
    }
    100% {
        transform: translateY(-90px) translateZ(800px) scale(4) rotateY(180deg);
    }
}

/* Envelope container fades out during zoom */
#envelope-container.fading {
    animation: envelopeFadeOut 1.2s ease-in forwards;
}

@keyframes envelopeFadeOut {
    0% {
        opacity: 1;
    }
    100% {
        opacity: 0;
    }
}

.letter h1 {
    font-family: 'Playfair Display', serif;
    font-size: clamp(1.4rem, 4vw, 2.8rem);
    color: var(--secondary-accent);
    margin: 2px 0;
    font-weight: 700;
    letter-spacing: 2px;
    line-height: 1.1;
}

.letter .ampersand {
    font-size: clamp(1.8rem, 5vw, 3.2rem);
    color: var(--primary-accent);
    margin: 5px 0;
    font-family: 'Playfair Display', serif;
    font-style: italic;
    font-weight: 400;
    text-shadow: 0 2px 10px rgba(212, 175, 55, 0.3);
    line-height: 1;
}

.letter .date {
    font-size: clamp(0.7rem, 2vw, 1.1rem);
    color: var(--text-muted);
    margin-top: 8px;
    font-weight: 400;
    letter-spacing: 4px;
    text-transform: uppercase;
    white-space: nowrap;
    display: block;
    width: 100%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

.letter .ornament {
    color: var(--primary-accent);
    font-size: clamp(0.9rem, 2.5vw, 1.6rem);
    margin: 3px 0;
    opacity: 0.7;
    line-height: 1;
}

/* Wax seal using actual image */
.wax-seal {
    position: absolute;
    top: 55%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100px;
    height: 100px;
    z-index: 20;
    cursor: pointer;
    transition: all 0.3s ease;
    filter: drop-shadow(0 6px 15px rgba(80, 0, 0, 0.4))
            drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
}

.wax-seal img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* Glowing pulse effect under seal */
.wax-seal::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 150%;
    height: 150%;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(212, 175, 55, 0.6) 0%, rgba(212, 175, 55, 0.3) 30%, rgba(212, 175, 55, 0) 70%);
    animation: sealGlow 2s ease-in-out infinite;
    pointer-events: none;
    z-index: -1;
}

@keyframes sealGlow {
    0%, 100% {
        opacity: 0.4;
        transform: translate(-50%, -50%) scale(1);
    }
    50% {
        opacity: 0.8;
        transform: translate(-50%, -50%) scale(1.2);
    }
}

.wax-seal:hover {
    transform: translate(-50%, -50%) scale(1.08);
    filter: drop-shadow(0 12px 30px rgba(80, 0, 0, 0.7));
}

.wax-seal:hover::before {
    animation-play-state: paused;
    opacity: 0;
}

.envelope-flap-closed.open ~ .wax-seal {
    animation: sealBreak 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}

@keyframes sealBreak {
    0% {
        transform: translate(-50%, -50%) scale(1) rotate(0deg);
        opacity: 1;
        filter: drop-shadow(0 6px 15px rgba(80, 0, 0, 0.4))
                drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
    }
    15% {
        transform: translate(-50%, -50%) scale(1.15) rotate(-5deg);
        filter: drop-shadow(0 10px 25px rgba(80, 0, 0, 0.5))
                drop-shadow(0 0 20px rgba(212, 175, 55, 0.6));
    }
    30% {
        transform: translate(-50%, -50%) scale(1.2) rotate(8deg);
        opacity: 1;
    }
    50% {
        transform: translate(-50%, -50%) scale(1.1) rotate(-3deg);
        opacity: 0.8;
    }
    100% {
        transform: translate(-50%, -50%) scale(0) rotate(45deg) translateY(-30px);
        opacity: 0;
        filter: drop-shadow(0 0 0 transparent);
    }
}

/* Seal glow burst on break */
.envelope-flap-closed.open ~ .wax-seal::before {
    animation: sealGlowBurst 0.6s ease-out forwards;
}

@keyframes sealGlowBurst {
    0% {
        opacity: 0.8;
        transform: translate(-50%, -50%) scale(1);
    }
    50% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(2);
        background: radial-gradient(circle, rgba(212, 175, 55, 0.8) 0%, rgba(212, 175, 55, 0.4) 40%, transparent 70%);
    }
    100% {
        opacity: 0;
        transform: translate(-50%, -50%) scale(2.5);
    }
}

/* Envelope audio controls - visible on envelope page */
.envelope-audio-hint {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
    text-align: center;
    z-index: 5;
}

/* Heart Drawing Canvas */
#heart-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10001;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.8s ease-out;
}

#heart-canvas.active {
    opacity: 1;
}

#heart-canvas.fading {
    opacity: 0;
}

@media (max-width: 768px) {
    .envelope-wrapper {
        max-width: 95%;
    }

    .wax-seal {
        width: 80px;
        height: 80px;
    }

    .fold-left,
    .fold-right {
        width: 32%;
    }
}

/* Mobile phones */
@media (max-width: 480px) {
    .envelope-wrapper {
        max-width: 92%;
        animation: envelopeWiggle 4s ease-in-out infinite;
    }

    .wax-seal {
        width: 70px;
        height: 70px;
        /* Larger touch target */
        padding: 10px;
        margin: -10px;
    }

    /* Increase tap area without changing visual size */
    .wax-seal::after {
        content: '';
        position: absolute;
        top: -15px;
        left: -15px;
        right: -15px;
        bottom: -15px;
    }

    .letter h1 {
        font-size: clamp(1.1rem, 5vw, 1.8rem);
        letter-spacing: 1px;
    }

    .letter .ampersand {
        font-size: clamp(1.4rem, 6vw, 2rem);
        margin: 3px 0;
    }

    .letter .date {
        font-size: clamp(0.55rem, 2.5vw, 0.8rem);
        letter-spacing: 2px;
        margin-top: 5px;
    }

    .letter .ornament {
        font-size: clamp(0.7rem, 3vw, 1rem);
        margin: 2px 0;
    }

    .letter-content {
        padding: 10px;
    }

    .letter-back-seal {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }

    .envelope-audio-hint {
        bottom: 20px;
        font-size: 0.8rem;
        padding: 0 20px;
    }

    /* Adjust letter animation for smaller screens */
    @keyframes letterRise {
        0% {
            opacity: 0;
            transform: translateY(0) translateZ(0) scale(1) rotateY(0deg);
        }
        30% {
            opacity: 1;
            transform: translateY(-20px) translateZ(50px) scale(1) rotateY(0deg);
        }
        100% {
            opacity: 1;
            transform: translateY(-60px) translateZ(100px) scale(1.03) rotateY(0deg);
        }
    }

    .letter.risen {
        transform: translateY(-60px) translateZ(100px) scale(1.03) rotateY(0deg);
    }

    @keyframes letterFlipToBack {
        0% {
            transform: translateY(-60px) translateZ(100px) scale(1.03) rotateY(0deg);
        }
        100% {
            transform: translateY(-60px) translateZ(100px) scale(1.03) rotateY(180deg);
        }
    }

    .letter.flipped {
        transform: translateY(-60px) translateZ(100px) scale(1.03) rotateY(180deg);
    }

    @keyframes letterZoomIn {
        0% {
            transform: translateY(-60px) translateZ(100px) scale(1.03) rotateY(180deg);
        }
        100% {
            transform: translateY(-60px) translateZ(500px) scale(3) rotateY(180deg);
        }
    }
}

/* Extra small phones */
@media (max-width: 375px) {
    .envelope-wrapper {
        max-width: 95%;
    }

    .wax-seal {
        width: 60px;
        height: 60px;
    }

    .letter h1 {
        font-size: clamp(0.95rem, 5vw, 1.4rem);
    }

    .letter .ampersand {
        font-size: clamp(1.2rem, 6vw, 1.6rem);
    }

    .letter .date {
        font-size: clamp(0.5rem, 2.5vw, 0.65rem);
        letter-spacing: 1px;
    }

    .letter-back-seal {
        width: 50px;
        height: 50px;
        font-size: 1.2rem;
    }
}