/* ============================================
   3D PAPER ANIMATIONS - CODEX & CLOUD V1
   ============================================ */

/* ── 3D Container ── */
.anim-3d-perspective {
    perspective: 1200px;
    perspective-origin: center;
}

/* ── Crumpled Paper Unfold ── */
.paper-unfold {
    transform-style: preserve-3d;
    transform: rotateX(15deg) rotateY(-10deg) scale(0.85);
    opacity: 0;
    filter: brightness(0.7) contrast(1.1);
    transition: transform 0.8s cubic-bezier(0.23, 1, 0.32, 1),
                opacity 0.8s ease,
                filter 0.8s ease;
}
.paper-unfold.is-revealed {
    transform: rotateX(0) rotateY(0) scale(1);
    opacity: 1;
    filter: brightness(1) contrast(1);
}

/* ── Torn Paper Effect ── */
.torn-container {
    position: relative;
    overflow: visible;
}
.torn-left, .torn-right {
    transition: transform 1s cubic-bezier(0.23, 1, 0.32, 1), opacity 0.8s ease;
}
.torn-left {
    clip-path: polygon(0 0, 100% 0, 96% 8%, 100% 15%, 94% 22%, 100% 30%, 95% 38%, 100% 45%, 96% 52%, 100% 60%, 94% 68%, 100% 75%, 97% 82%, 100% 90%, 95% 100%, 0 100%);
}
.torn-right {
    clip-path: polygon(4% 0, 100% 0, 100% 100%, 5% 100%, 0 90%, 3% 82%, 0 75%, 6% 68%, 0 60%, 4% 52%, 0 45%, 5% 38%, 0 30%, 6% 22%, 0 15%, 4% 8%);
}

/* ── Fragment Assembly ── */
.fragment {
    transition: transform 1.2s cubic-bezier(0.23, 1, 0.32, 1),
                opacity 1s ease,
                filter 0.8s ease;
    transform-style: preserve-3d;
}
.fragment.is-scattered {
    opacity: 0;
    filter: blur(2px) brightness(0.8);
}
.fragment.is-assembled {
    opacity: 1;
    filter: blur(0) brightness(1);
}

/* ── Flying Component ── */
.fly-from-left {
    transform: translateX(-120vw) rotate(-15deg);
    opacity: 0;
    transition: transform 1s cubic-bezier(0.23, 1, 0.32, 1),
                opacity 0.6s ease;
}
.fly-from-right {
    transform: translateX(120vw) rotate(15deg);
    opacity: 0;
    transition: transform 1s cubic-bezier(0.23, 1, 0.32, 1),
                opacity 0.6s ease;
}
.fly-from-top {
    transform: translateY(-100vh) rotate(10deg);
    opacity: 0;
    transition: transform 1s cubic-bezier(0.23, 1, 0.32, 1),
                opacity 0.6s ease;
}
.fly-from-bottom {
    transform: translateY(100vh) rotate(-10deg);
    opacity: 0;
    transition: transform 1s cubic-bezier(0.23, 1, 0.32, 1),
                opacity 0.6s ease;
}
.fly-landed {
    transform: translateX(0) translateY(0) rotate(0) !important;
    opacity: 1 !important;
}

/* ── Paper Texture Overlay ── */
.paper-texture::before {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        repeating-linear-gradient(
            45deg,
            transparent,
            transparent 2px,
            rgba(0,0,0,0.015) 2px,
            rgba(0,0,0,0.015) 4px
        );
    pointer-events: none;
    z-index: 1;
    border-radius: inherit;
}

/* ── Crumple Wrinkle Lines ── */
.crumple-lines::after {
    content: '';
    position: absolute;
    inset: 0;
    background:
        linear-gradient(137deg, transparent 40%, rgba(0,0,0,0.04) 40.5%, transparent 41%),
        linear-gradient(43deg, transparent 55%, rgba(0,0,0,0.03) 55.5%, transparent 56%),
        linear-gradient(97deg, transparent 30%, rgba(0,0,0,0.025) 30.5%, transparent 31%),
        linear-gradient(163deg, transparent 65%, rgba(0,0,0,0.035) 65.5%, transparent 66%);
    pointer-events: none;
    z-index: 1;
    border-radius: inherit;
    opacity: 0;
    transition: opacity 0.6s ease;
}
.crumple-lines.is-revealed::after {
    opacity: 1;
}

/* ── Shadow for depth during animation ── */
.anim-shadow {
    box-shadow: 0 25px 60px -12px rgba(0,0,0,0.25),
                0 0 0 1px rgba(0,0,0,0.03);
}
.anim-shadow.is-settled {
    box-shadow: var(--shadow);
}

/* ── Shimmer on reveal ── */
@keyframes shimmer-reveal {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}
.shimmer-reveal {
    position: relative;
    overflow: hidden;
}
.shimmer-reveal::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        90deg,
        transparent 0%,
        rgba(255,255,255,0.15) 50%,
        transparent 100%
    );
    background-size: 200% 100%;
    animation: shimmer-reveal 1.5s ease forwards;
    animation-play-state: paused;
    pointer-events: none;
}
.shimmer-reveal.is-shimmering::after {
    animation-play-state: running;
}

/* ── Card Slice (like paper being cut) ── */
.slice-top, .slice-bottom {
    overflow: hidden;
    transition: transform 0.8s cubic-bezier(0.23, 1, 0.32, 1);
}
.slice-top {
    clip-path: inset(0 0 50% 0);
}
.slice-bottom {
    clip-path: inset(50% 0 0 0);
}

/* ── Mosaic Assembly ── */
.mosaic-piece {
    transition: transform 1s cubic-bezier(0.23, 1, 0.32, 1),
                opacity 0.8s ease;
    transform-style: preserve-3d;
}

/* ── Scroll-triggered 3D rotation ── */
.rotate-in-left {
    transform: perspective(1000px) rotateY(25deg) translateX(-80px);
    opacity: 0;
}
.rotate-in-right {
    transform: perspective(1000px) rotateY(-25deg) translateX(80px);
    opacity: 0;
}
.rotate-in-top {
    transform: perspective(1000px) rotateX(-20deg) translateY(-60px);
    opacity: 0;
}
.rotate-in-bottom {
    transform: perspective(1000px) rotateX(20deg) translateY(60px);
    opacity: 0;
}

/* ── Particle Scatter ── */
.particle {
    position: absolute;
    border-radius: 2px;
    background: var(--primary);
    opacity: 0;
    pointer-events: none;
}

/* ── Fold Crease Line ── */
.fold-crease {
    position: relative;
}
.fold-crease::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    width: 1px;
    height: 100%;
    background: linear-gradient(
        to bottom,
        transparent 0%,
        rgba(0,0,0,0.08) 20%,
        rgba(0,0,0,0.12) 50%,
        rgba(0,0,0,0.08) 80%,
        transparent 100%
    );
    z-index: 2;
    opacity: 0;
    transition: opacity 0.5s ease;
}
.fold-crease.is-crease-visible::before {
    opacity: 1;
}

/* ── Mobile adjustments ── */
@media (max-width: 768px) {
    .fly-from-left, .fly-from-right {
        transform: translateX(0) !important;
        opacity: 1 !important;
    }
    .paper-unfold {
        transform: scale(0.95) !important;
    }
}