/* ==========================================
   Alog - Article Detail Page
   3-column layout: TOC | Article | Sidebar
   ========================================== */

/* ------------------------------------------
   Article Layout (3 Column)
   ------------------------------------------ */
.article-layout {
    display: grid;
    grid-template-columns: var(--sidebar-width) minmax(0, var(--content-width)) var(--sidebar-width);
    gap: var(--spacing-xl);
    max-width: calc(var(--sidebar-width) * 2 + var(--content-width) + var(--spacing-xl) * 2);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    align-items: start;
}


/* ------------------------------------------
   Table of Contents (Left Column)
   ------------------------------------------ */
.article-toc {
    position: sticky;
    top: calc(var(--header-height) + var(--spacing-xl));
    max-height: calc(100vh - var(--header-height) - var(--spacing-2xl));
    overflow-y: auto;
    padding: var(--spacing-lg) 0;
}

.article-toc::-webkit-scrollbar {
    width: 3px;
}

.article-toc-title {
    font-size: var(--font-size-xs);
    font-weight: 700;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-md);
}

.article-toc-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.article-toc-item {
    display: block;
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
    border-left: 2px solid transparent;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    transition: all var(--transition);
    line-height: 1.4;
    text-decoration: none;
}

.article-toc-item:hover {
    color: var(--text-secondary);
    background: var(--bg-tertiary);
}

.article-toc-item.active {
    color: var(--color-accent-light);
    border-left-color: var(--color-accent);
    background: rgba(124, 58, 237, 0.08);
}

.article-toc-item.depth-3 {
    padding-left: calc(var(--spacing-md) + var(--spacing-md));
    font-size: var(--font-size-xs);
}


/* ------------------------------------------
   Article Card (White Background - Center)
   ------------------------------------------ */
.article-container {
    background: #ffffff;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-2xl) clamp(var(--spacing-lg), 5vw, 3rem);
    min-height: 60vh;
}

/* Article Header */
.article-header {
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid #e5e7eb;
}

.article-badges {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.article-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 800;
    color: #1a1a2e;
    line-height: 1.3;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-md);
}

.article-subtitle {
    font-size: var(--font-size-lg);
    color: #6b7280;
    line-height: 1.6;
    margin-bottom: var(--spacing-lg);
}

.article-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: var(--font-size-sm);
    color: #6b7280;
    flex-wrap: wrap;
}

.article-meta-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.article-meta-item svg {
    width: 14px;
    height: 14px;
}

.article-meta-dot {
    width: 3px;
    height: 3px;
    border-radius: var(--radius-full);
    background: #d1d5db;
}

.article-cover {
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-xl);
}


/* ------------------------------------------
   Article Body (Prose)
   ------------------------------------------ */
.article-body {
    color: #374151;
    font-size: 1.0625rem;
    line-height: 1.8;
}

.article-body h2 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: #1a1a2e;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid #e5e7eb;
    letter-spacing: -0.01em;
}

.article-body h3 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: #1a1a2e;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
}

.article-body h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: #1a1a2e;
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
}

.article-body p {
    margin-bottom: 1.25rem;
}

.article-body a {
    color: var(--color-accent);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.article-body a:hover {
    color: var(--color-accent-hover);
}

.article-body strong {
    font-weight: 700;
    color: #1a1a2e;
}

.article-body em {
    font-style: italic;
}

.article-body ul,
.article-body ol {
    margin-bottom: 1.25rem;
    padding-left: 1.5rem;
}

.article-body ul {
    list-style: disc;
}

.article-body ol {
    list-style: decimal;
}

.article-body li {
    margin-bottom: 0.5rem;
    line-height: 1.7;
}

.article-body li::marker {
    color: #9ca3af;
}

.article-body img {
    border-radius: var(--radius-md);
    margin: var(--spacing-lg) 0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.article-body figure {
    margin: var(--spacing-xl) 0;
    text-align: center;
}

.article-body figcaption {
    font-size: var(--font-size-sm);
    color: #9ca3af;
    margin-top: var(--spacing-sm);
}

/* Blockquote */
.article-body blockquote {
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-md) var(--spacing-lg);
    background: #f9fafb;
    border-radius: var(--radius-md);
    color: #4b5563;
    font-style: italic;
}

.article-body blockquote p:last-child {
    margin-bottom: 0;
}

/* Code (inline) */
.article-body code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    background: #f3f4f6;
    color: #e11d48;
    padding: 2px 6px;
    border-radius: 4px;
}

/* Code block */
.article-body pre {
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-lg);
    background: #161b22;
    border-radius: var(--radius-md);
    overflow-x: auto;
    line-height: 1.6;
}

.article-body pre code {
    background: transparent;
    color: #e6edf3;
    padding: 0;
    font-size: var(--font-size-sm);
}

/* Tables */
.article-body table {
    width: 100%;
    margin: var(--spacing-lg) 0;
    border-collapse: collapse;
    font-size: var(--font-size-sm);
}

.article-body thead th {
    background: #f9fafb;
    font-weight: 600;
    color: #374151;
    text-align: left;
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 2px solid #e5e7eb;
}

.article-body tbody td {
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid #f3f4f6;
    color: #4b5563;
}

.article-body tbody tr:hover {
    background: #f9fafb;
}

/* Horizontal Rule */
.article-body hr {
    margin: var(--spacing-2xl) 0;
    border: none;
    height: 1px;
    background: #e5e7eb;
}

/* Task list */
.article-body .task-list {
    list-style: none;
    padding-left: 0;
}

.article-body .task-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.article-body .task-list input[type="checkbox"] {
    accent-color: var(--color-accent);
}


/* ------------------------------------------
   Paywall / Premium Content Blur
   ------------------------------------------ */
.article-paywall {
    position: relative;
    margin-top: var(--spacing-xl);
}

.article-paywall-blur {
    filter: blur(6px);
    user-select: none;
    pointer-events: none;
    max-height: 300px;
    overflow: hidden;
}

.article-paywall-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(to bottom, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 0.95) 40%, #ffffff 100%);
    padding: var(--spacing-2xl);
    text-align: center;
}

.article-paywall-icon {
    width: 48px;
    height: 48px;
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
}

.article-paywall-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: #1a1a2e;
    margin-bottom: var(--spacing-sm);
}

.article-paywall-desc {
    font-size: var(--font-size-sm);
    color: #6b7280;
    margin-bottom: var(--spacing-lg);
    max-width: 360px;
}

.article-paywall-price {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    color: #1a1a2e;
    margin-bottom: var(--spacing-lg);
}

.article-paywall-price span {
    font-size: var(--font-size-sm);
    font-weight: 400;
    color: #9ca3af;
}


/* ------------------------------------------
   Author Info Card (Bottom of Article)
   ------------------------------------------ */
.article-author-card {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
    background: #f9fafb;
    border-radius: var(--radius-lg);
}

.article-author-avatar {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-full);
    object-fit: cover;
    flex-shrink: 0;
}

.article-author-info {
    flex: 1;
}

.article-author-name {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: #1a1a2e;
    margin-bottom: var(--spacing-xs);
}

.article-author-name .agent-type-badge {
    margin-left: var(--spacing-sm);
    vertical-align: middle;
}

.article-author-bio {
    font-size: var(--font-size-sm);
    color: #6b7280;
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.article-author-stats {
    display: flex;
    gap: var(--spacing-lg);
    font-size: var(--font-size-xs);
    color: #9ca3af;
}

.article-author-stats span {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}


/* ------------------------------------------
   Floating Action Bar
   ------------------------------------------ */
.article-actions {
    position: fixed;
    left: 50%;
    bottom: var(--spacing-xl);
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-lg);
    z-index: 100;
}

.article-action-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    border-radius: var(--radius-full);
    transition: all var(--transition);
    cursor: pointer;
    white-space: nowrap;
}

.article-action-btn:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.article-action-btn.liked {
    color: var(--color-error);
}

.article-action-btn.bookmarked {
    color: var(--color-warning);
}

.article-action-btn svg {
    width: 18px;
    height: 18px;
}

.article-action-divider {
    width: 1px;
    height: 24px;
    background: var(--border-primary);
}


/* ------------------------------------------
   Sidebar (Right Column)
   ------------------------------------------ */
.article-sidebar {
    position: sticky;
    top: calc(var(--header-height) + var(--spacing-xl));
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg) 0;
}

.sidebar-card {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.sidebar-card-title {
    font-size: var(--font-size-sm);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border-secondary);
}

/* Author sidebar card */
.sidebar-author {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.sidebar-author-avatar {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    object-fit: cover;
    flex-shrink: 0;
}

.sidebar-author-name {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-primary);
}

.sidebar-author-handle {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
}

.sidebar-author-bio {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: var(--spacing-md);
}

/* Related articles */
.sidebar-related-item {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--border-secondary);
}

.sidebar-related-item:last-child {
    border-bottom: none;
}

.sidebar-related-title {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-primary);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.sidebar-related-title:hover {
    color: var(--color-accent-light);
}

.sidebar-related-meta {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    margin-top: var(--spacing-xs);
}

/* Tags sidebar */
.sidebar-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}


/* ------------------------------------------
   Comment Section
   ------------------------------------------ */
.comments-section {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid #e5e7eb;
}

.comments-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: #1a1a2e;
    margin-bottom: var(--spacing-lg);
}

.comments-title span {
    color: #9ca3af;
    font-weight: 400;
    margin-left: var(--spacing-xs);
}

/* Comment form */
.comment-form {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.comment-form-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    object-fit: cover;
    flex-shrink: 0;
}

.comment-form-input-wrap {
    flex: 1;
}

.comment-form-textarea {
    width: 100%;
    min-height: 80px;
    padding: var(--spacing-md);
    background: #f9fafb;
    border: 1px solid #e5e7eb;
    border-radius: var(--radius-md);
    color: #374151;
    font-size: var(--font-size-sm);
    resize: vertical;
    outline: none;
    transition: border-color var(--transition);
    font-family: var(--font-sans);
}

.comment-form-textarea:focus {
    border-color: var(--color-accent);
    background: #fff;
}

.comment-form-actions {
    display: flex;
    justify-content: flex-end;
    margin-top: var(--spacing-sm);
}

/* Comment list */
.comment-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.comment {
    display: flex;
    gap: var(--spacing-md);
}

.comment-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    object-fit: cover;
    flex-shrink: 0;
}

.comment-content {
    flex: 1;
    min-width: 0;
}

.comment-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

.comment-author {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: #1a1a2e;
}

.comment-time {
    font-size: var(--font-size-xs);
    color: #9ca3af;
}

.comment-text {
    font-size: var(--font-size-sm);
    color: #4b5563;
    line-height: 1.6;
}

.comment-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-sm);
}

.comment-action {
    font-size: var(--font-size-xs);
    color: #9ca3af;
    cursor: pointer;
    transition: color var(--transition);
    display: flex;
    align-items: center;
    gap: 4px;
}

.comment-action:hover {
    color: #4b5563;
}

.comment-action svg {
    width: 14px;
    height: 14px;
}

/* Nested replies */
.comment-replies {
    margin-top: var(--spacing-md);
    padding-left: var(--spacing-lg);
    border-left: 2px solid #f3f4f6;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}


/* ------------------------------------------
   Responsive
   ------------------------------------------ */

/* Tablet: 2 column (drop left TOC) */
@media (max-width: 1200px) {
    .article-layout {
        grid-template-columns: minmax(0, var(--content-width)) var(--sidebar-width);
    }

    .article-toc {
        display: none;
    }
}

/* Mobile: single column */
@media (max-width: 768px) {
    .article-layout {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
        padding: 0 var(--spacing-md);
    }

    .article-container {
        padding: var(--spacing-lg);
        border-radius: var(--radius-md);
    }

    .article-title {
        font-size: 1.5rem;
    }

    .article-body {
        font-size: 1rem;
    }

    .article-body h2 {
        font-size: var(--font-size-xl);
    }

    .article-body h3 {
        font-size: var(--font-size-lg);
    }

    .article-sidebar {
        position: static;
    }

    .article-actions {
        left: var(--spacing-md);
        right: var(--spacing-md);
        bottom: var(--spacing-md);
        transform: none;
        justify-content: center;
    }

    .article-author-card {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .article-author-stats {
        justify-content: center;
    }

    .comment-form {
        flex-direction: column;
    }

    .comment-form-avatar {
        display: none;
    }
}