:root {
    --it-panel-width: 340px;
    /* Base Theme */
    --it-bg-primary: #111827;
    --it-bg-secondary: #1f2937;
    --it-border-color: #374151;
    --it-text-primary: #f9fafb;
    --it-text-secondary: #d1d5db;
    /* Custom Palette */
    --it-accent-cyan: #00ffff;
    --it-accent-magenta: #ff00ff;
    --it-accent-purple: #9400d3;

    /* Grayscale Button Colors */
    --it-button-border-light: #575757;
    --it-button-border-dark: #373737;
    --it-button-text-light: #d1d5db;
    --it-button-text-dark: #f9fafb;
    --it-button-hover-bg: #2d2d2d;
    --it-button-active-bg: #444444;

    /* Grayscale Text Colors */
    --it-text-gray-light: #d1d5db; /* For titles and prices */
    --it-text-gray-dark: #f9fafb; /* For hover states etc. */
}

/* --- WRAPPER & LAYOUT --- */
.it-ebooks-fullwidth {
    position: relative;
    width: calc(100vw - 15px);
    left: calc(50% + 7.5px);
    right: 50%;
    margin-left: calc(-50vw + 15px);
    margin-right: -50vw;
    box-sizing: border-box;
    padding: 2rem min(4vw, 32px);
    background-color: var(--it-bg-primary);
}

.it-ebooks-content {
    transition: margin-left 0.3s ease-in-out;
}
@media (min-width: 992px) {
    body.it-panel-open .it-ebooks-content {
        margin-left: var(--it-panel-width);
    }
}

/* --- SIDE RAIL (ICON BUTTONS) --- */
.it-side-rail {
    position: fixed;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    display: grid;
    gap: 8px;
    z-index: 100040;
    transition: left 0.3s ease-in-out;
}
.it-rail-tab {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
	opacity: 0.5;
    background-color: rgba(31, 41, 55, 0.5);
    color: var(--it-text-secondary);
    border: 1px solid var(--it-border-color);
    border-left: none;
    border-radius: 0 8px 8px 0;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
    transition: background-color 0.2s ease, color 0.2s ease;
}
.it-rail-tab:hover {
    background-color: var(--it-border-color);
    color: var(--it-text-primary);
}
.it-rail-tab[aria-expanded="true"] {
    background-color: var(--it-accent-cyan);
    color: var(--it-bg-primary);
}
body.it-panel-open .it-side-rail {
    left: min(var(--it-panel-width), 90vw);
}

/* Tooltip Styles */
.it-rail-tab::after {
    content: attr(data-tooltip);
    position: absolute;
    left: 100%;
    top: 50%;
    transform: translateY(-50%) translateX(10px);
    background-color: var(--it-bg-primary);
    color: var(--it-text-primary);
    padding: 0.25rem 0.6rem;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    white-space: nowrap;
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
    z-index: 1;
}
.it-rail-tab:hover::after {
    opacity: 1;
    transform: translateY(-50%) translateX(15px);
}


/* --- PANELS --- */
.it-panels {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    width: 0;
    z-index: 100030;
    pointer-events: none;
}
.it-panel {
    position: absolute;
    top: 0;
    left: 0;
    width: var(--it-panel-width);
    max-width: 90vw;
    height: 100%;
    background-color: var(--it-bg-secondary);
    color: var(--it-text-primary);
    box-shadow: 0 0 40px rgba(0,0,0,0.5);
    transform: translateX(-100%);
    transition: transform 0.3s ease-in-out;
    pointer-events: auto;
    display: flex;
    flex-direction: column;
}
.it-panel.is-open {
    transform: translateX(0);
}
.it-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    background-color: var(--it-bg-primary);
    flex-shrink: 0;
}
.it-panel-title {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 600;
}
.it-filter-reset {
    font-size: 0.85rem;
    color: var(--it-text-secondary);
    text-decoration: none;
}
.it-filter-reset:hover {
    color: var(--it-accent-cyan);
    text-decoration: underline;
}
.it-panel-body {
    padding: 1.25rem;
    flex-grow: 1;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

/* --- FILTER & OPTIONS FORM STYLES --- */
.it-filter-group, .it-option-group {
    border-bottom: 1px solid var(--it-border-color);
    padding-bottom: 1rem;
    margin-bottom: 1rem;
}
.it-filter-group:last-child, .it-option-group:last-child {
    border-bottom: none;
    margin-bottom: 0;
}
.it-filter-summary {
    font-weight: 600;
    font-size: 1rem;
    color: var(--it-text-primary);
    cursor: pointer;
    padding-bottom: 0.75rem;
    list-style: none;
}
.it-filter-summary::-webkit-details-marker { display: none; }
.it-cat-ul, .it-author-ul {
    list-style: none;
    padding: 0;
    margin: 0;
}
.it-cat-li, .it-author-li {
    display: block;
    margin-bottom: 6px;
}
.it-cat-root { font-weight: 500; }
.it-cat-ul .it-cat-ul { padding-left: 1.25rem; margin-top: 0.5rem; }
.it-cat-option, .it-author-option, .it-option-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 0;
    cursor: pointer;
    color: var(--it-text-secondary);
}
.it-cat-option:hover, .it-author-option:hover, .it-option-label:hover {
    color: var(--it-text-primary);
}
input[type="radio"], input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    width: 1.15em;
    height: 1.15em;
    border: 2px solid var(--it-border-color);
    border-radius: 50%;
    margin: 0;
    flex-shrink: 0;
    display: grid;
    place-content: center;
    transition: border-color 0.2s ease;
}
input[type="checkbox"] { border-radius: 4px; }
input[type="radio"]:hover, input[type="checkbox"]:hover {
    border-color: var(--it-accent-cyan);
}
input[type="radio"]::before, input[type="checkbox"]::before {
    content: '';
    width: 0.65em;
    height: 0.65em;
    border-radius: 50%;
    transform: scale(0);
    transition: 120ms transform ease-in-out;
    background-color: var(--it-accent-cyan);
}
input[type="checkbox"]::before { border-radius: 2px; }
input[type="radio"]:checked, input[type="checkbox"]:checked {
    border-color: var(--it-accent-cyan);
}
input[type="radio"]:checked::before, input[type="checkbox"]:checked::before {
    transform: scale(1);
}

/* --- PRODUCT GRID --- */
.it-ebooks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 1.5rem 1.5rem;
}
.it-ebooks-empty { color: var(--it-text-secondary); }

/* --- PRODUCT CARD --- */
.it-ebook-card {
    display: flex;
    flex-direction: column;
}
.it-ebook-thumb-link {
    display: block;
}
.it-ebook-thumb {
    aspect-ratio: 3 / 4;
    border-radius: 8px;
    overflow: hidden;
    background-color: var(--it-bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.it-ebook-thumb-link:hover .it-ebook-thumb {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.4);
}
.it-ebook-thumb img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}
.it-ebook-thumb-placeholder {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--it-text-secondary);
    padding: 1rem;
    text-align: center;
}
.it-ebook-meta {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}
.it-ebook-title {
    margin: 0;
    font-size: 1rem;
    font-weight: 500;
    line-height: 1.3;
    color: var(--it-text-gray-light);
}
.it-ebook-title a {
    color: inherit;
    text-decoration: none;
}
.it-ebook-title a:hover {
    color: var(--it-text-gray-dark);
}
.it-ebook-price {
    font-weight: 600;
    color: var(--it-text-gray-light);
    margin-top: 0.25rem;
}
.it-ebook-excerpt {
    font-size: 0.85rem;
    color: var(--it-text-secondary);
    line-height: 1.5;
    margin-top: 0.5rem;
}

/* --- ACTION BUTTONS (INCREASED SPECIFICITY + GRAYSCALE) --- */
.it-ebooks-wrap .it-ebooks-grid .it-ebook-actions {
    display: flex !important;
    gap: 0.5rem !important;
    margin: 0.75rem 0 !important;
}
.it-ebooks-wrap .it-ebooks-grid .it-ebook-actions .button {
    flex: 1 !important;
    text-align: center !important;
    padding: 0.3rem 0.5rem !important;
    font-size: 0.8rem !important;
    font-weight: 600 !important;
    text-decoration: none !important;
    text-transform: uppercase !important;
    letter-spacing: 0.05em !important;
    border-radius: 8px !important;
    border: 2px solid var(--it-button-border-dark) !important;
    background: transparent !important;
    color: var(--it-button-text-light) !important;
    transition: all 0.2s ease !important;
    cursor: pointer !important;
    box-shadow: none !important;
    text-shadow: none !important;
}
.it-ebooks-wrap .it-ebooks-grid .it-ebook-actions .button:hover {
    color: var(--it-button-text-dark) !important;
    border-color: var(--it-button-border-light) !important;
    background: var(--it-button-hover-bg) !important;
    box-shadow: none !important;
}
.it-ebooks-wrap .it-ebooks-grid .it-ebook-actions .ajax_add_to_cart.loading {
    opacity: 0.7 !important;
    background: var(--it-button-active-bg) !important;
}
.it-ebooks-wrap .it-ebooks-grid .it-ebook-actions .ajax_add_to_cart.added {
    background: var(--it-button-active-bg) !important;
    border-color: var(--it-button-border-light) !important;
    color: var(--it-button-text-dark) !important;
    box-shadow: none !important;
}
.it-ebooks-wrap .it-ebooks-grid .it-ebook-actions .ajax_add_to_cart.added::after {
    font-family: WooCommerce !important;
    content: '\e017' !important;
    margin-left: 0.5em !important;
}
.it-ebooks-wrap .it-ebooks-grid .it-ebook-actions .ajax_add_to_cart {
    border-color: var(--it-button-border-light) !important;
    color: var(--it-button-text-dark) !important;
}
.it-ebooks-wrap .it-ebooks-grid .it-ebook-actions .ajax_add_to_cart:hover {
    border-color: var(--it-button-border-light) !important;
    background: var(--it-button-hover-bg) !important;
}
.it-ebooks-wrap .it-ebooks-grid .it-ebook-actions .it-view-button {
    border-color: var(--it-button-border-dark) !important;
}
.it-ebooks-wrap .it-ebooks-grid .it-ebook-actions .it-view-button:hover {
    border-color: var(--it-button-border-light) !important;
}


/* --- OPTIONS PANEL FUNCTIONALITY --- */
.it-ebooks-wrap.hide-price .it-ebook-price {
    display: none;
}
.it-ebooks-wrap .it-ebook-excerpt {
    display: none;
}
.it-ebooks-wrap.show-excerpt .it-ebook-excerpt {
    display: block;
}
/* Rule for showing/hiding titles */
.it-ebooks-wrap .it-ebook-title {
    display: none; /* Hidden by default */
}
.it-ebooks-wrap.show-title .it-ebook-title {
    display: block; /* Shown when 'show-title' class is active */
}


/* --- PAGINATION --- */
.it-ebooks-pagination {
    margin-top: 2.5rem;
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}
.it-ebooks-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0.25rem 0.5rem;
    border: 1px solid var(--it-border-color);
    border-radius: 8px;
    text-decoration: none;
    color: var(--it-text-secondary);
    transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.it-ebooks-page:hover {
    border-color: var(--it-accent-cyan);
    color: var(--it-text-primary);
}
.it-ebooks-page.is-active {
    background-color: var(--it-accent-cyan);
    border-color: var(--it-accent-cyan);
    color: var(--it-bg-primary);
    font-weight: 600;
}