/* Standard Keyframe Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
    100% { transform: translateY(0px); }
}

@keyframes scaleUp {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes gradientBG {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

@keyframes flipPageForward {
    from { 
        transform: rotateY(0deg); 
        opacity: 1;
        box-shadow: inset 0 0 0 rgba(0,0,0,0);
    }
    to { 
        transform: rotateY(-180deg); 
        opacity: 0;
        box-shadow: inset 100px 0 100px -50px rgba(0,0,0,0.5);
    }
}

@keyframes flipPageBackward {
    from { 
        transform: rotateY(0deg); 
        opacity: 1;
        box-shadow: inset 0 0 0 rgba(0,0,0,0);
    }
    to { 
        transform: rotateY(180deg); 
        opacity: 0;
        box-shadow: inset -100px 0 100px -50px rgba(0,0,0,0.5);
    }
}

@keyframes revealPage {
    from { opacity: 0; transform: scale(1.05); filter: blur(10px); }
    to { opacity: 1; transform: scale(1); filter: blur(0); }
}

@keyframes slideInFromRight {
    from { opacity: 0; transform: translateX(50px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes slideInFromLeft {
    from { opacity: 0; transform: translateX(-50px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes zoomIn {
    from { opacity: 0; transform: scale(0.8); }
    to { opacity: 1; transform: scale(1); }
}

/* Page Flip Container */
body {
    /* NO perspective here — perspective on body breaks position:fixed (portal centering) */
    background-color: var(--darker);
}

/* Perspective wrapper sits between body and page-content-wrapper.
   This preserves the 3D flip effect WITHOUT affecting fixed-position elements. */
#perspective-wrapper {
    perspective: 2000px;
}

#page-content-wrapper {
    width: 100%;
    min-height: 100vh;
    transform-style: preserve-3d;
    transition: transform 0.8s cubic-bezier(0.645, 0.045, 0.355, 1);
}

.flipping-forward {
    animation: flipPageForward 0.8s cubic-bezier(0.645, 0.045, 0.355, 1) forwards;
    transform-origin: left;
}

.flipping-backward {
    animation: flipPageBackward 0.8s cubic-bezier(0.645, 0.045, 0.355, 1) forwards;
    transform-origin: right;
}

.revealing-page {
    animation: revealPage 0.6s ease-out forwards;
}

/* Animation Classes */
.animate {
    opacity: 0;
    transition: opacity 1s cubic-bezier(0.2, 0.8, 0.2, 1), transform 1s cubic-bezier(0.2, 0.8, 0.2, 1), filter 1s ease;
    will-change: transform, opacity, filter;
}

.animate.in-view {
    opacity: 1 !important;
    transform: translate(0, 0) scale(1) !important;
    filter: blur(0) !important;
}

.fade-in-up {
    transform: translateY(40px);
}

.fade-in-right {
    transform: translateX(40px);
}

.fade-in-left {
    transform: translateX(-40px);
}

.zoom-in {
    transform: scale(0.8);
}

.blur-in {
    filter: blur(10px);
}

.float {
    animation: float 4s ease-in-out infinite;
}

/* Glassmorphism Classes */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
}

/* Removing old shutter styles */
.page-shutter {
    display: none;
}