feat: enhance theme functionality and add social sharing metadata
- Added new UI strings for theme toggle, copy functionality, and navigation. - Implemented dynamic theme color for mobile browsers based on user selection. - Introduced Open Graph and Twitter Card metadata for improved social sharing. - Added JSON-LD structured data for articles to enhance SEO. - Created a new JavaScript file for theme behavior, including theme picker, reading progress bar, back-to-top button, and image lightbox functionality. - Enhanced code blocks with copy-to-clipboard buttons and improved tabbed code block functionality. - Implemented a random navigation order feature and a table of contents generator for articles.
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@@ -1539,6 +1539,165 @@ footer.footer-modern a:hover {
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text-decoration: none;
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}
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/* ========================================
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SKIP-TO-CONTENT LINK (keyboard / a11y)
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======================================== */
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.skip-link {
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position: fixed;
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top: -120px;
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left: 1rem;
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z-index: 3000;
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padding: 0.6rem 1rem;
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background: var(--accent);
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color: var(--accent-contrast);
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border-radius: var(--radius-sm);
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font-weight: 600;
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text-decoration: none;
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box-shadow: var(--shadow-md);
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transition: top 0.15s ease;
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}
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.skip-link:focus {
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top: 1rem;
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color: var(--accent-contrast);
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text-decoration: none;
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outline: 2px solid var(--accent-contrast);
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outline-offset: 2px;
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}
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/* The skip target shouldn't paint a focus ring when jumped to */
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#main-content:focus {
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outline: none;
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}
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/* ========================================
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READING PROGRESS BAR
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======================================== */
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.reading-progress {
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position: fixed;
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top: 0;
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left: 0;
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right: 0;
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height: 3px;
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z-index: 1040; /* above the fixed-top navbar (Bootstrap z-index 1030) */
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background: transparent;
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pointer-events: none;
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}
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.reading-progress-fill {
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height: 100%;
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width: 0;
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background: var(--accent);
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transition: width 0.05s linear;
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}
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/* ========================================
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BACK-TO-TOP BUTTON
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======================================== */
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.back-to-top {
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position: fixed;
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bottom: 1.5rem;
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right: 1.5rem;
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z-index: 1035;
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width: 44px;
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height: 44px;
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padding: 0;
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border: none;
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border-radius: 50%;
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background: var(--accent);
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color: var(--accent-contrast);
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font-size: 1.25rem;
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display: flex;
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align-items: center;
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justify-content: center;
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cursor: pointer;
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box-shadow: var(--shadow-md);
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opacity: 0;
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visibility: hidden;
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transform: translateY(10px);
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transition: opacity 0.2s ease, transform 0.2s ease, visibility 0s linear 0.2s, background 0.15s ease;
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}
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.back-to-top.is-visible {
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opacity: 1;
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visibility: visible;
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transform: translateY(0);
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transition: opacity 0.2s ease, transform 0.2s ease, visibility 0s linear 0s, background 0.15s ease;
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}
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.back-to-top:hover {
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background: var(--accent-hover);
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}
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/* ========================================
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COPY-TO-CLIPBOARD ON CODE BLOCKS
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======================================== */
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.code-block {
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position: relative;
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}
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.code-copy {
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position: absolute;
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top: 0.5rem;
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right: 0.5rem;
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z-index: 2;
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width: 32px;
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height: 32px;
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padding: 0;
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display: inline-flex;
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align-items: center;
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justify-content: center;
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border: 1px solid var(--border-color);
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border-radius: var(--radius-sm);
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background: var(--bg-subtle);
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color: var(--text-secondary);
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cursor: pointer;
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opacity: 0;
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transition: opacity 0.15s ease, color 0.15s ease, background 0.15s ease, border-color 0.15s ease;
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}
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.code-block:hover .code-copy,
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.code-copy:focus {
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opacity: 1;
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}
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.code-copy:hover {
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color: var(--text-primary);
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border-color: var(--accent);
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}
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.code-copy.is-copied {
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opacity: 1;
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color: var(--accent-contrast);
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background: var(--accent);
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border-color: var(--accent);
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}
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.code-copy i {
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font-size: 0.95rem;
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line-height: 1;
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}
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/* Touch devices have no hover — keep the button discoverable */
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@media (hover: none) {
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.code-copy { opacity: 0.7; }
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}
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/* ========================================
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GPU HINTS — promote animated layers ahead of time
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======================================== */
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.lightbox-overlay img,
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.carousel-slide img {
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will-change: transform;
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}
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/* Respect users who prefer reduced motion */
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@media (prefers-reduced-motion: reduce) {
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.reading-progress-fill { transition: none; }
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.back-to-top,
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.back-to-top.is-visible { transform: none; }
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}
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/* ========================================
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RESPONSIVE
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======================================== */
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