/* Scroll to Top Button */
.scroll-to-top {
    position: fixed;
    bottom: var(--spacing-2xl);
    right: var(--spacing-2xl);
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-smooth);
    box-shadow: var(--shadow-3);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
}

.scroll-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-to-top:hover {
    box-shadow: var(--shadow-4);
    transform: translateY(-4px);
}

.scroll-to-top:active {
    transform: translateY(-2px);
}

/* Loading Overlay */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    border-radius: inherit;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Sidebar Mobile Enhancements */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -280px;
        top: 0;
        height: 100vh;
        width: 260px;
        z-index: 1000;
        background: white;
        overflow-y: auto;
        transition: left var(--transition-smooth);
        box-shadow: var(--shadow-4);
    }

    .sidebar.sidebar-visible {
        left: 0;
    }

    .sidebar-open::before {
        content: '';
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 999;
    }

    .site-header {
        position: sticky;
        top: 0;
        z-index: 1001;
    }
}

/* Image Lazy Loading */
img[data-src] {
    opacity: 0;
    transition: opacity var(--transition-smooth);
}

img.loaded {
    opacity: 1;
}

/* Skeleton Loading States */
.skeleton {
    background: linear-gradient(90deg,
            var(--color-bg-secondary) 25%,
            #f0f0f0 50%,
            var(--color-bg-secondary) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
}

@keyframes skeleton-loading {
    0% {
        background-position: 200% 0;
    }

    100% {
        background-position: -200% 0;
    }
}

/* Enhanced Card Transitions */
.block-item,
.collection-item {
    transition: all var(--transition-smooth);
    position: relative;
}

.block-item:hover,
.collection-item:hover {
    z-index: 2;
}

/* Print Styles */
@media print {

    .site-header,
    .sidebar,
    .pagination,
    .scroll-to-top,
    .cart-link {
        display: none !important;
    }

    .main-content {
        width: 100% !important;
        margin: 0 !important;
    }

    .block-item,
    .collection-item {
        break-inside: avoid;
        page-break-inside: avoid;
    }

    body {
        background: white !important;
    }
}

/* Accessibility Improvements */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Focus Visible for Keyboard Navigation */
a:focus-visible,
button:focus-visible,
input:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Smooth Transitions for Theme Elements */
* {
    transition-property: background-color, border-color, color, fill, stroke, opacity, box-shadow, transform;
}

/* Mobile Menu Toggle Animation */
.menu-toggle {
    position: relative;
    overflow: hidden;
}

.menu-toggle::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    transform: translate(-50%, -50%);
    transition: width 0.3s, height 0.3s;
}

.menu-toggle:active::before {
    width: 200px;
    height: 200px;
}

/* Tooltip Styles */
[data-tooltip] {
    position: relative;
}

[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(-8px);
    background: var(--color-text);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-smooth), transform var(--transition-smooth);
    z-index: 1000;
}

[data-tooltip]:hover::after {
    opacity: 1;
    transform: translateX(-50%) translateY(-4px);
}