/* Preloader Core */
#site-preloader {
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.preloader-content-wrapper {
    position: relative;
    z-index: 100;
}

/* Spinner */
.preloader-spinner {
    width: 50px;
    height: 50px;
    border: 5px solid rgba(255,255,255,0.3);
    border-top-color: currentColor; 
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* --- Slides / Tiles --- */
.preloader-tile-vertical {
    position: fixed;
    top: 0;
    height: 100%;
    z-index: 1; /* Below content (100) */
    transition: transform 0.8s ease-in-out;
    border-right: 1px solid rgba(0,0,0,0.05); /* Subtle divider */
    box-sizing: border-box; /* Crucial for width + border */
    transform: translateY(0); /* Start position */
    will-change: transform;
}

/* --- Curtain --- */
.preloader-panel-left, .preloader-panel-right {
    position: fixed;
    top: 0;
    width: 50%;
    height: 100%;
    z-index: 1;
    transition: transform 1.2s cubic-bezier(0.77, 0, 0.175, 1);
    will-change: transform;
}
.preloader-panel-left { left: 0; transform-origin: left; }
.preloader-panel-right { right: 0; transform-origin: right; }

/* --- Blinds --- */
.preloader-blind-horizontal {
    position: fixed;
    left: 0;
    width: 100%;
    z-index: 1;
    transition: transform 0.8s ease-in-out;
    transform-origin: top;
    will-change: transform;
}

/* --- Iris --- */
.preloader-anim-iris {
    /* Transitions handled by class addition or JS */
}

/* --- Diagonal --- */
.preloader-diagonal-part {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    transition: transform 1s cubic-bezier(0.7, 0, 0.3, 1);
    will-change: transform;
}

/* --- Checkerboard --- */
.preloader-checker-cell {
    position: fixed;
    z-index: 1;
    transition: transform 0.5s ease-in-out, opacity 0.5s ease-in-out;
    will-change: transform, opacity;
}

/* --- Glass Effect (Dark) --- */
.preloader-glass {
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: inset 0 0 100px rgba(0,0,0,0.7), inset 0 0 30px rgba(255,255,255,0.05) !important;
    background-image: 
        radial-gradient(circle at 20% 20%, rgba(255,255,255,0.05) 0%, transparent 25%),
        radial-gradient(circle at 80% 80%, rgba(0,0,0,0.6) 0%, transparent 40%);
    border: 1px solid rgba(255,255,255,0.05);
    position: fixed;
}

.preloader-glass::after {
    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='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.04'/%3E%3C/svg%3E");
    pointer-events: none;
    z-index: 0;
}

.preloader-glass::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 150vw;
    height: 150vw;
    background: radial-gradient(circle, rgba(0,0,0,0.6) 0%, transparent 70%);
    pointer-events: none;
    z-index: -1;
    animation: glassPulse 6s ease-in-out infinite alternate;
}

@keyframes glassPulse {
    0% { transform: translate(-50%, -50%) scale(0.9); opacity: 0.4; }
    100% { transform: translate(-50%, -50%) scale(1.2); opacity: 0.8; }
}

/* --- Glass Tiles --- */
.preloader-tile-glass {
    position: fixed;
    top: 0;
    height: 100%;
    z-index: 10;
    transition: transform 0.8s ease-in-out;
    /* Glass Effect */
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    background-color: rgba(15, 15, 20, 0.75);
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.04'/%3E%3C/svg%3E");
    border-right: 1px solid rgba(255,255,255,0.05); /* Separator */
    box-sizing: border-box;
    will-change: transform;
}