/* Glassmorphism Theme Additions */
.glass-panel {
    background: rgba(30, 41, 59, 0.6);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.checkerboard {
    background-image: linear-gradient(45deg, #1e293b 25%, transparent 25%),
                      linear-gradient(-45deg, #1e293b 25%, transparent 25%),
                      linear-gradient(45deg, transparent 75%, #1e293b 75%),
                      linear-gradient(-45deg, transparent 75%, #1e293b 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}

/* Animations */
@keyframes float {
    0% { transform: translateY(0px) scale(1); }
    50% { transform: translateY(-20px) scale(1.05); }
    100% { transform: translateY(0px) scale(1); }
}

@keyframes float-delayed {
    0% { transform: translateY(0px) scale(1); }
    50% { transform: translateY(20px) scale(0.95); }
    100% { transform: translateY(0px) scale(1); }
}

.animate-float {
    animation: float 15s ease-in-out infinite;
}

.animate-float-delayed {
    animation: float-delayed 18s ease-in-out infinite;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in-up {
    animation: fadeInUp 0.6s ease-out forwards;
}

/* Crop Handles UI */
.crop-handle {
    width: 32px;
    height: 32px;
    background-color: rgba(59, 130, 246, 0.3);
    border: 3px solid #3b82f6;
    border-radius: 50%;
    position: absolute;
    transform: translate(-50%, -50%);
    pointer-events: auto;
    cursor: grab;
    touch-action: none; /* Critical for mobile dragging */
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 10px rgba(0,0,0,0.5);
}

.crop-handle::after {
    content: '';
    width: 8px;
    height: 8px;
    background: #fff;
    border-radius: 50%;
}

.crop-handle:active {
    cursor: grabbing;
    background-color: rgba(59, 130, 246, 0.8);
    transform: translate(-50%, -50%) scale(1.2);
}

/* Page Thumbnail */
.page-thumbnail {
    cursor: grab;
    transition: transform 0.2s;
}

.page-thumbnail:active {
    cursor: grabbing;
}

.sortable-ghost {
    opacity: 0.4;
}

.sortable-drag {
    box-shadow: 0 10px 25px rgba(0,0,0,0.5);
}