/*
  Page-specific stylesheet for the Post Detail page
  Version: 2.1 - "The Polished Reading Room"
*/

/* --- 1. Reading Progress Bar --- */
.reading-progress-bar {
    position: fixed;
    top: var(--header-height);
    left: 0;
    height: 4px;
    background-color: var(--color-primary);
    width: 0%;
    z-index: 1001;
    transition: width 0.1s linear;
}

/* --- 2. Main Layout --- */
.post-detail-container {
    padding: var(--section-padding);
    background-color: var(--color-light);
}

.post-detail-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 4rem;
    max-width: 1100px;
    margin: 0 auto;
}

@media (min-width: 1024px) {
    .post-detail-grid {
        grid-template-columns: 1fr 280px;
    }
}

.post-content-area {
    max-width: 720px;
}

/* --- 3. Article Header & Cover Image --- */
.post-header {
    margin-bottom: 3rem;
}

.post-category {
    display: block;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--color-primary);
    text-transform: uppercase;
    margin-bottom: 1rem;
}

.post-header h1 {
    font-size: clamp(2.5rem, 6vw, 3.5rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

.post-meta {
    color: var(--color-secondary);
    font-size: 0.9rem;
}

.post-cover-image {
    margin-bottom: 3rem;
    border-radius: 12px;
    overflow: hidden;
    line-height: 0;
}

.post-cover-image img {
    width: 100%;
    height: auto;
}

/* --- 4. Article Body Typography --- */
.post-body {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #343a40;
}

.post-body p,
.post-body ul,
.post-body ol,
.post-body blockquote {
    margin-bottom: 1.5rem;
}

.post-body h2 {
    font-size: 1.8rem;
    font-weight: 700;
    margin: 3.5rem 0 1.5rem 0;
    line-height: 1.3;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--color-border);
}

.post-body h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 2.5rem 0 1.5rem 0;
}

.post-body ul,
.post-body ol {
    list-style-position: outside;
    padding-left: 1.5rem;
}

.post-body li {
    margin-bottom: 0.75rem;
}

.post-body blockquote {
    border-left: 3px solid var(--color-primary);
    padding-left: 2rem;
    margin: 2.5rem 0;
    font-size: 1.2rem;
    font-style: italic;
    color: var(--color-secondary);
}

.in-article-image {
    margin: 3rem 0;
}

.in-article-image img {
    border-radius: 8px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
}

.in-article-image figcaption {
    font-size: 0.9rem;
    text-align: center;
    color: var(--color-secondary);
    margin-top: 1rem;
}

/* --- 5. Article Footer --- */
.post-footer {
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.post-tags span {
    font-weight: 700;
}

.post-tags a {
    display: inline-block;
    background-color: var(--color-light-grey);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.85rem;
    margin-left: 0.5rem;
    transition: background-color 0.3s ease;
}

.post-tags a:hover {
    background-color: #e9f2ff;
    color: var(--color-primary);
}

.post-share {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.post-share img {
    height: 20px;
    width: 20px;
    opacity: 0.6;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.post-share a:hover img {
    opacity: 1;
    transform: scale(1.1);
}


/* --- 6. Sidebar --- */
.post-sidebar {
    width: 100%;
}

.sidebar-sticky-content {
    position: -webkit-sticky;
    position: sticky;
    /* ★ MODIFIED: Increased top margin for better spacing */
    top: calc(var(--header-height) + 2rem);
}

.sidebar-widget {
    margin-bottom: 3rem;
    opacity: 0;
    transition: opacity 0.5s ease;
}

.sidebar-widget.is-hidden {
    display: none;
}

.sidebar-widget.is-visible {
    opacity: 1;
}

.widget-title {
    font-size: 1.1rem;
    font-weight: 700;
    padding-bottom: 1rem;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--color-border);
}

/* Table of Contents */
.table-of-contents {
    list-style: none;
}

.table-of-contents a {
    display: block;
    padding: 0.6rem 0;
    color: var(--color-secondary);
    font-size: 0.9rem;
    transition: all 0.2s ease-in-out;
    border-left: 2px solid var(--color-border);
    padding-left: 1rem;
}

.table-of-contents a:hover {
    color: var(--color-primary);
    padding-left: 1.25rem;
}

.table-of-contents a.is-active {
    color: var(--color-primary);
    font-weight: 600;
    border-left-color: var(--color-primary);
    transform: translateX(5px);
}

/* Related Posts */
.related-posts-list {
    list-style: none;
}

.related-posts-list li {
    margin-bottom: 0.5rem;
}

.related-posts-list a {
    display: flex;
    gap: 1rem;
    align-items: center;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--color-border);
}

.related-posts-list li:last-child a {
    border-bottom: none;
}

.related-post-image {
    width: 80px;
    height: 50px;
    flex-shrink: 0;
    border-radius: 6px;
    object-fit: cover;
}

.related-post-title {
    font-size: 0.9rem;
    line-height: 1.4;
    color: var(--color-dark);
    transition: color 0.3s ease;
}

.related-posts-list a:hover .related-post-title {
    color: var(--color-primary);
}

/* --- Final CTA --- */
.final-cta-section {
    background-image: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('../images/backgrounds/bg-knowledge-hall.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}