/* ============================================
   Article Page Specific Styles
   ============================================ */

.article-container {
    max-width: 1000px;
    margin: 80px auto 0;
    padding: 2rem;
}

.article-content {
    background-color: var(--bg-secondary);
    padding: 0;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    overflow: auto;
}

.article-header {
    margin: 0;
    padding: 3rem 4rem 2rem 4rem;
    border-bottom: 2px solid var(--border-color);
    background-color: var(--bg-primary);
}

.article-header time {
    display: block;
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.article-header h1 {
    font-size: 2.5rem;
    margin: 0 0 1rem 0;
    line-height: 1.2;
}

.article-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin: 0;
    font-weight: 400;
}

.article-section {
    padding: 2rem 4rem;
    margin-bottom: 0;
}

.article-section h2 {
    font-size: 1.75rem;
    margin: 2rem 0 1rem 0;
    color: var(--text-primary);
}

.article-section h3 {
    font-size: 1.35rem;
    margin: 1.5rem 0 0.75rem 0;
    color: var(--text-primary);
}

.article-section p {
    margin-bottom: 1.25rem;
    line-height: 1.8;
}

.article-section ul,
.article-section ol {
    margin: 1rem 0 1.5rem 2rem;
    line-height: 1.8;
}

.article-section li {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

/* Equations and Math */
.equation {
    margin: 1.5rem 0;
    padding: 1.5rem;
    background-color: var(--code-bg);
    border-radius: 6px;
    border-left: 4px solid var(--accent-highlight);
    overflow-x: auto;
}

.equation .MathJax {
    font-size: 1.1em;
}

/* Code Blocks */
.code-block {
    margin: 1.5rem 0;
    background-color: var(--code-bg);
    border-radius: 6px;
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.code-block pre {
    margin: 0;
    padding: 1.5rem;
    overflow-x: auto;
}

.code-block code {
    font-family: 'Courier New', 'Consolas', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    background: none;
    padding: 0;
    color: var(--text-primary);
}

/* Images and Diagrams */
.article-image {
    max-width: 100%;
    height: auto;
    margin: 2rem 0;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    display: block;
}

/* Back Button in Toolbar */
.back-btn {
    padding: 0.5rem 1rem;
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 4px;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: background-color 0.2s ease, border-color 0.2s ease;
    font-size: 0.95rem;
}

.back-btn:hover {
    background-color: var(--bg-secondary);
    border-color: var(--accent-highlight);
}

/* Author Badge */
.author-badge {
    margin-left: 1rem;
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-weight: 600;
    border-radius: 20px;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    border: 1px solid var(--border-color);
}

/* ============================================
   Table of Contents Sidebar
   ============================================ */

.toc-container {
    position: fixed;
    z-index: 900;
}

/* Toggle Button (Mobile) */
.toc-toggle {
    position: fixed;
    left: 1rem;
    bottom: 1rem;
    padding: 0.75rem 1rem;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    transition: all 0.2s ease;
    z-index: 901;
}

.toc-toggle:hover {
    background-color: var(--code-bg);
    border-color: var(--accent-highlight);
}

.toc-toggle i {
    color: var(--text-primary);
}

[data-theme="light"] .toc-toggle {
    background-color: var(--bg-secondary);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .toc-toggle i {
    color: var(--text-primary);
}

/* Sidebar */
.toc-sidebar {
    position: fixed;
    left: -320px;
    top: 0;
    width: 300px;
    height: 100vh;
    background-color: var(--bg-primary);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    transition: left 0.3s ease;
    z-index: 1000;
}

.toc-sidebar.open {
    left: 0;
}

/* TOC Header */
.toc-header {
    padding: 1rem 1.5rem;
    background-color: var(--header-bg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.toc-header h3 {
    font-size: 1rem;
    margin: 0;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.toc-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s ease;
}

.toc-close:hover {
    color: var(--accent-highlight);
}

/* TOC Content */
.toc-content {
    padding: 1.5rem;
}

.toc-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.toc-item,
.toc-item-sub {
    margin-bottom: 0.5rem;
}

.toc-item-sub {
    margin-left: 1rem;
}

.toc-link {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.5rem 0.75rem;
    border-radius: 4px;
    font-size: 0.9rem;
    line-height: 1.4;
    transition: all 0.2s ease;
    border-left: 3px solid transparent;
}

.toc-link:hover {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border-left-color: var(--accent-highlight);
}

.toc-link.active {
    background-color: var(--code-bg);
    color: var(--accent-highlight);
    border-left-color: var(--accent-highlight);
    font-weight: 600;
}

/* Overlay for mobile */
.toc-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    z-index: 999;
}

.toc-overlay.visible {
    opacity: 1;
    visibility: visible;
}

/* Desktop: Always show TOC */
@media (min-width: 1024px) {
    .toc-toggle {
        display: none;
    }

    .toc-sidebar {
        left: 0;
        top: 60px;
        height: calc(100vh - 60px);
    }

    .toc-sidebar.open {
        left: 0;
    }

    .toc-overlay {
        display: none;
    }

    .toc-close {
        display: none;
    }

    .toc-header {
        position: sticky;
        top: 0;
        left: 0;
    }

    /* Adjust article container to make room for TOC */
    .article-container {
        margin-left: 320px;
    }
}

/* Mobile: Author badge responsive */
@media (max-width: 768px) {
    .author-badge {
        font-size: 0.75rem;
        padding: 0.4rem 0.7rem;
        margin-left: 0.5rem;
    }
    
    .back-btn {
        font-size: 0.85rem;
        padding: 0.4rem 0.7rem;
    }
}

/* Very small screens: Hide author badge */
@media (max-width: 480px) {
    .author-badge {
        display: none;
    }
}

/* Article Footer */
.article-footer {
    margin-top: 0;
    padding: 2rem 4rem 3rem 4rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.article-footer a {
    color: var(--link-color);
    font-weight: 500;
}

/* Responsive Design for Articles */
@media (max-width: 768px) {
    .article-container {
        padding: 1rem;
        margin-top: 60px;
    }

    .article-content {
        padding: 0;
    }

    .article-header {
        padding: 2rem 1.5rem 1.5rem 1.5rem;
    }

    .article-header h1 {
        font-size: 1.75rem;
    }

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

    .article-section {
        padding: 1.5rem;
    }

    .article-footer {
        padding: 1.5rem;
    }

    .code-block pre {
        padding: 1rem;
        font-size: 0.85rem;
    }
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
}

table th,
table td {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    text-align: left;
}

table th {
    background-color: var(--code-bg);
    font-weight: 600;
    color: var(--text-primary);
}

table td {
    color: var(--text-secondary);
}

/* Blockquotes */
blockquote {
    margin: 1.5rem 0;
    padding: 1rem 1.5rem;
    border-left: 4px solid var(--accent-highlight);
    background-color: var(--code-bg);
    font-style: italic;
    color: var(--text-secondary);
}

/* Inline Code */
p code,
li code {
    background-color: var(--code-bg);
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-size: 0.9em;
    color: var(--accent-highlight);
}