/**
 * Article Content Styles
 * 
 * Comprehensive styling for article content including:
 * - Headings with proper hierarchy
 * - Code blocks with syntax highlighting
 * - Blockquotes and callouts
 * - Tables with responsive design
 * - Lists (ordered, unordered, task lists)
 * - Images and figures
 * - Horizontal rules
 * - Custom containers/alerts
 */

/* =================================================================
   Article Body Container
   ================================================================= */

.article-body {
    font-size: var(--font-size-base);
    line-height: 1.7;
    color: var(--color-text-primary);
    word-wrap: break-word;
}

.article-body ul {
    line-height: 1.5;
}

/* Add scrollable space so last content can reach the detection line (40% from top)
   Spacer should be approximately the reading position offset, not full viewport */
.article-body::after {
    content: '';
    display: block;
    height: 50vh;
    /* Just enough to scroll last content to reading position */
}

/* =================================================================
   Headings
   ================================================================= */

.article-body h1:not(.page-h1),
.article-body h2,
.article-body h3,
.article-body h4,
.article-body h5,
.article-body h6 {
    margin-top: var(--spacing-4);
    margin-bottom: var(--spacing-2);
    font-weight: 600;
    line-height: 1.25;
    color: var(--color-text-emphasis);
}

.article-body h1:first-child {
    margin-top: 0;
}

.article-body h1:not(.page-h1) {
    padding-bottom: var(--spacing-2);
}

.article-body h2 {
    border-bottom: none;
    padding-bottom: var(--spacing-1);
    background: linear-gradient(to right, var(--color-purple-dark), transparent);
    background-size: 100% 1px;
    background-position: bottom;
    background-repeat: no-repeat;
}

.article-body h3 {
    padding-bottom: var(--spacing-1);
}

.article-body h4 {
    padding-bottom: var(--spacing-1);
}

.article-body h5 {
    padding-bottom: var(--spacing-1);
}

.article-body h6 {
    color: var(--color-text-muted);
    padding-bottom: var(--spacing-1);
}

/* =================================================================
   Paragraphs and Text
   ================================================================= */

.article-body p {
    margin-top: 0;
    margin-bottom: var(--spacing-2);
}

.article-body strong {
    font-weight: 600;
}

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

/* =================================================================
   Links
   ================================================================= */

.article-body a {
    color: var(--color-purple-bright);
    text-decoration: none;
}

@media (hover: hover) {
  .article-body a:hover {
    text-decoration: underline;
    text-decoration-color: var(--color-purple-bright);
    text-underline-offset: 2px;
  }

  .article-body a[class*="badge"]:hover,
  .article-body a[class*="btn"]:hover,
  .article-body a.button:hover {
    text-decoration: none;
  }
}

.article-body a:focus-visible {
    outline: 2px solid var(--color-purple-bright);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* =================================================================
   Code Blocks and Inline Code
   ================================================================= */

.article-body code {
    font-family: var(--font-family-mono);
    font-size: 0.875em;
    background: var(--color-purple-bg-subtle);
    border: 1px solid var(--color-purple-border-subtle);
    border-radius: var(--radius-sm);
    padding: 0.125rem 0.375rem;
}

.article-body pre {
    background: var(--color-bg-default);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-md);
    padding: var(--spacing-3);
    overflow-x: auto;
    margin: var(--spacing-3) 0;
    line-height: 1.5;
}

.article-body pre code {
    background: none;
    border: none;
    padding: 0;
    font-size: 0.875rem;
    color: var(--color-text-primary);
}

/* Syntax highlighting adjustments */
.article-body pre code.hljs {
    display: block;
    padding: 0;
    background: transparent;
}

/* =================================================================
   Blockquotes
   ================================================================= */

.article-body blockquote {
    margin: var(--spacing-3) 0;
    padding: 0 var(--spacing-2);
    border-left: 4px solid var(--color-purple-bright);
    color: var(--color-text-muted);
    font-style: italic;
}

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

.article-body blockquote cite {
    display: block;
    margin-top: var(--spacing-1);
    font-size: var(--font-size-sm);
    font-style: normal;
    color: var(--color-text-muted);
}

/* =================================================================
   Lists
   ================================================================= */

.article-body ul,
.article-body ol {
    margin: var(--spacing-2) 0;
    padding-left: var(--spacing-4);
}

.article-body li {
    margin-bottom: var(--spacing-1);
}

.article-body li > p {
    margin-bottom: var(--spacing-1);
}

.article-body ul ul,
.article-body ul ol,
.article-body ol ul,
.article-body ol ol {
    margin-top: var(--spacing-1);
    margin-bottom: var(--spacing-1);
}

/* Task Lists (GitHub-style checkboxes) */
.article-body .task-list-item {
    list-style-type: none;
    margin-left: calc(-1 * var(--spacing-3));
}

.article-body .task-list-item input[type="checkbox"] {
    margin-right: var(--spacing-1);
}

/* =================================================================
   Tables
   ================================================================= */

.article-body table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-3) 0;
    overflow-x: auto;
    display: block;
}

.article-body thead {
    border-bottom: 2px solid var(--color-border-emphasis);
}

.article-body thead tr {
    background: var(--color-bg-emphasis);
}

.article-body th,
.article-body td {
    padding: var(--spacing-2);
    border: 1px solid var(--color-border-default);
    text-align: left;
}

.article-body th {
    font-weight: 600;
    color: var(--color-text-emphasis);
}

.article-body tbody tr:nth-child(odd) {
    background: var(--color-bg-default);
}

.article-body tbody tr:nth-child(even) {
    background: var(--color-bg-emphasis);
}

@media (hover: hover) {
  .article-body tr:hover {
    background: var(--color-purple-bg-subtle) !important;
  }
}

/* =================================================================
   Horizontal Rules
   ================================================================= */

.article-body hr {
    height: 0;
    margin: var(--spacing-4) 0;
    border: 0;
    border-top: 1px solid var(--color-border-default);
}

/* =================================================================
   Images and Figures
   ================================================================= */

.article-body img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin: var(--spacing-2) 0;
}

.article-body figure {
    margin: var(--spacing-3) 0;
    text-align: center;
}

.article-body figcaption {
    margin-top: var(--spacing-1);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    font-style: italic;
}

/* =================================================================
   Custom Containers / Alerts (Markdig)
   ================================================================= */

.article-body .alert {
    padding: var(--spacing-2) var(--spacing-3);
    margin: var(--spacing-3) 0;
    border-left: 4px solid;
    border-radius: var(--radius-md);
    background: var(--color-bg-emphasis);
}

.article-body .alert-note {
    border-color: var(--color-blue-light);
    background: var(--color-blue-light-bg);
}

.article-body .alert-tip {
    border-color: var(--color-green-dark);
    background: var(--color-green-dark-bg);
}

.article-body .alert-important {
    border-color: var(--color-purple-dark);
    background: var(--color-purple-bg-subtle);
}

.article-body .alert-warning {
    border-color: var(--color-ochre);
    background: var(--color-ochre-bg);
}

.article-body .alert-caution {
    border-color: var(--color-red);
    background: var(--color-red-bg);
}

/* =================================================================
   Abbreviations and Definitions
   ================================================================= */

.article-body abbr {
    text-decoration: underline dotted;
    cursor: help;
}

.article-body dl {
    margin: var(--spacing-2) 0;
}

.article-body dt {
    font-weight: 600;
    margin-top: var(--spacing-2);
}

.article-body dd {
    margin-left: var(--spacing-4);
    margin-bottom: var(--spacing-1);
}

/* =================================================================
   Footnotes
   ================================================================= */

.article-body .footnotes {
    margin-top: var(--spacing-5);
    padding-top: var(--spacing-3);
    border-top: 1px solid var(--color-border-default);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.article-body .footnote-ref {
    font-size: 0.75em;
    vertical-align: super;
}

/* =================================================================
   Mermaid Diagrams
   ================================================================= */

/* Neutralize ALL global or article "pre" styling for mermaid blocks 
   so the diagram behaves like the raw HTML test page */
pre.mermaid, .article-body pre.mermaid {
    all: unset !important;
    display: block !important;
    position: relative !important;
    width: 100% !important;
    text-align: center !important;
    margin: var(--spacing-2) 0 0 0 !important;
    overflow: visible !important;
    background: transparent !important;
    border: none !important;
    padding: 0 !important;
}

.article-body .mermaid-caption,
.article-body p.mermaid-caption,
.article-body em.mermaid-caption {
    display: block;
    text-align: right;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    font-style: italic;
    margin: 0.25rem 0 var(--spacing-3) 0;
    padding-right: var(--spacing-1);
}

.mermaid-expand-btn {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    background: var(--color-bg-emphasis);
    border: 1px solid var(--color-text-secondary);
    border-radius: 6px;
    padding: 0.5rem 0.75rem;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    line-height: 1;
    color: var(--color-text-primary);
    display: flex;
    align-items: center;
    gap: 0.375rem;
    transition: all 0.2s;
    z-index: 10;
    box-shadow: var(--shadow-sm);
}

/* Hide expand button on mobile/tablet - diagrams are already full-width */
@media (max-width: 768px) {
    .mermaid-expand-btn {
        display: none;
    }
}

.mermaid-expand-btn svg {
    flex-shrink: 0;
}

@media (hover: hover) {
  .mermaid-expand-btn:hover {
    background: var(--color-purple-dark);
    border-color: var(--color-purple-bright);
    color: var(--color-text-on-emphasis);
    box-shadow: var(--shadow-md);
  }
}

.mermaid-expand-btn:active {
    background: var(--color-purple-medium);
}

/* Mermaid fullscreen modal */
.mermaid-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 9999;
    display: none;
    align-items: center;
    justify-content: center;
}

.mermaid-modal.active {
    display: flex;
}

.mermaid-modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-black-backdrop-strong);
    cursor: pointer;
}

.mermaid-modal-content {
    position: relative;
    max-width: 95vw;
    max-height: 95vh;
    overflow: auto;
    z-index: 10000;
    padding: 2rem;
}

.mermaid-modal-close {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 10001;
    background: var(--color-purple-dark);
    border: 1px solid var(--color-purple-bright);
    border-radius: var(--radius-md);
    padding: var(--spacing-2) var(--spacing-4);
    cursor: pointer;
    color: var(--color-text-on-emphasis);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    transition: all var(--duration-fast) var(--easing-ease);
    text-decoration: none;
}

@media (hover: hover) {
  .mermaid-modal-close:hover {
    background: var(--color-purple-medium);
    border-color: var(--color-purple-bright);
  }
}

.mermaid-modal-close:active {
    background: var(--color-purple-medium);
}

.mermaid-modal-close svg {
    flex-shrink: 0;
}

.mermaid-modal-diagram {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    min-height: 80vh;
}

.mermaid-modal-diagram .mermaid {
    position: relative;
    padding: var(--spacing-3);
    margin: 0;
}

.mermaid-modal-diagram .mermaid svg {
    max-width: none !important;
    max-height: 85vh;
    width: 85vw;
    height: auto !important;
}

/* =================================================================
   Math Blocks
   ================================================================= */

.article-body .math {
    overflow-x: auto;
    margin: var(--spacing-2) 0;
}

/* =================================================================
   Responsive Adjustments
   ================================================================= */

@media (max-width: 768px) {

    .article-body table {
        font-size: var(--font-size-sm);
    }

    .article-body pre {
        padding: var(--spacing-2);
    }

}

/* =================================================================
   Video Embeds (YouTube)
   ================================================================= */

.article-body .video-container {
    position: relative;
    width: 100%;
    max-width: 960px;
    aspect-ratio: 16 / 9;
    margin: var(--spacing-6) 0;
    border-radius: var(--radius-lg);
    background: var(--color-bg-default);
    overflow: clip;
}

.article-body .video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
    border-radius: var(--radius-lg);
}

/* =================================================================
   Print Styles
   ================================================================= */

@media print {

    .article-body {
        color: var(--color-print-text);
    }

    .article-body a {
        color: var(--color-print-text);
        text-decoration: underline;
    }

    .article-body pre {
        border: 1px solid var(--color-print-border);
        page-break-inside: avoid;
    }
}