/* Article Styles - Modern Readable Design 2025 */
/* No animations - clean, practical, readable */

/* ═══════════════════════════════════════════════════
   TYPOGRAPHY - Distinctive readable fonts
   ═══════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Source+Serif+4:opsz,wght@8..60,400;8..60,500;8..60,600;8..60,700&family=DM+Sans:wght@400;500;600;700&display=swap');

:root {
    /* Article-specific typography */
    --font-heading: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Source Serif 4', Georgia, 'Times New Roman', serif;
    --font-ui: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Warm professional palette */
    --article-bg: #FAFAF8;
    --article-surface: #FFFFFF;
    --article-text: #2D3748;
    --article-text-muted: #64748B;
    --article-heading: #1A365D;
    --article-accent: #2B6CB0;
    --article-accent-light: #EBF4FF;
    --article-success: #38A169;
    --article-success-light: #F0FFF4;
    --article-warning: #D69E2E;
    --article-warning-light: #FFFFF0;
    --article-border: #E2E8F0;
    --article-code-bg: #F7FAFC;
    
    /* Reading optimized spacing */
    --article-max-width: 720px;
    --toc-width: 260px;
    --reading-line-height: 1.85;
}

/* ═══════════════════════════════════════════════════
   PAGE LAYOUT
   ═══════════════════════════════════════════════════ */

.article-page {
    background: var(--article-bg) !important;
    min-height: 100vh;
    padding-bottom: 0 !important;
}

/* Disable the decorative body::before from styles-modern.css */
body.article-page::before {
    display: none !important;
    content: none !important;
}

/* Reset all page-surface styles */
.article-page .page-surface {
    background: transparent !important;
    box-shadow: none !important;
    border: none !important;
    max-width: none !important;
    margin: 0 !important;
    padding: 0 !important;
}

/* Ensure main has clean background */
.article-page main {
    background: var(--article-bg);
}

/* Reading Progress Bar */
.reading-progress {
    position: fixed;
    top: 73px;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--article-border);
    z-index: 100;
}

.reading-progress__bar {
    height: 100%;
    background: var(--article-accent);
    width: 0%;
}

/* ═══════════════════════════════════════════════════
   COMPACT HERO
   ═══════════════════════════════════════════════════ */

.article-hero-compact {
    background: var(--article-surface);
    border-bottom: 1px solid var(--article-border);
    padding: 2.5rem 0;
}

.article-hero-compact .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}


.article-hero-compact h1 {
    font-family: var(--font-heading);
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--article-heading);
    line-height: 1.2;
    margin: 0 0 1rem 0;
    letter-spacing: -0.02em;
}

.article-hero__lead {
    font-family: var(--font-body);
    font-size: 1.125rem;
    color: var(--article-text-muted);
    line-height: 1.6;
    margin: 0 0 1.25rem 0;
    max-width: 680px;
}

.article-hero__meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1rem;
    font-family: var(--font-ui);
    font-size: 0.875rem;
    color: var(--article-text-muted);
}

.article-hero__meta-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.article-hero__meta-item svg {
    width: 16px;
    height: 16px;
    stroke: currentColor;
}

/* ═══════════════════════════════════════════════════
   MAIN LAYOUT WITH TOC
   ═══════════════════════════════════════════════════ */

.article-layout {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2.5rem 1.5rem 4rem;
    display: grid;
    grid-template-columns: var(--toc-width) 1fr;
    gap: 3rem;
    align-items: start;
}

@media (max-width: 1024px) {
    .article-layout {
        grid-template-columns: 1fr;
        padding: 1.5rem 1rem 3rem;
    }
}

/* ═══════════════════════════════════════════════════
   TABLE OF CONTENTS (TOC)
   ═══════════════════════════════════════════════════ */

.article-toc {
    position: sticky;
    top: 100px;
    max-height: calc(100vh - 140px);
    overflow-y: auto;
    padding-right: 1rem;
}

@media (max-width: 1024px) {
    .article-toc {
        position: static;
        max-height: none;
        background: var(--article-surface);
        border-radius: 8px;
        padding: 1.25rem;
        border: 1px solid var(--article-border);
        margin-bottom: 2rem;
    }
}

.toc-header {
    font-family: var(--font-ui);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--article-text-muted);
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--article-border);
}

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

.toc-list li {
    margin-bottom: 0.25rem;
}

.toc-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    font-family: var(--font-ui);
    font-size: 0.875rem;
    color: var(--article-text-muted);
    text-decoration: none;
    border-radius: 4px;
    border-left: 2px solid transparent;
    margin-left: -2px;
}

.toc-link:hover {
    color: var(--article-accent);
    background: var(--article-accent-light);
}

.toc-link.active {
    color: var(--article-accent);
    background: var(--article-accent-light);
    border-left-color: var(--article-accent);
    font-weight: 500;
}

.toc-link::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--article-border);
    flex-shrink: 0;
}

.toc-link.active::before,
.toc-link:hover::before {
    background: var(--article-accent);
}

/* Reading stats in TOC */
.toc-stats {
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--article-border);
    font-family: var(--font-ui);
    font-size: 0.8rem;
    color: var(--article-text-muted);
}

.toc-stat {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.toc-stat svg {
    width: 14px;
    height: 14px;
}

/* ═══════════════════════════════════════════════════
   ARTICLE CONTENT
   ═══════════════════════════════════════════════════ */

.article-main {
    background: var(--article-surface);
    border-radius: 12px;
    padding: 2.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    border: 1px solid var(--article-border);
}

@media (max-width: 768px) {
    .article-main {
        padding: 1.5rem;
        border-radius: 8px;
    }
}

.article-body {
    font-family: var(--font-body);
    font-size: 1.0625rem;
    line-height: var(--reading-line-height);
    color: var(--article-text);
}

.article-body p {
    margin-bottom: 1.5rem;
}

.article-body > p:first-child {
    font-size: 1.125rem;
    color: var(--article-text-muted);
}

/* Headings */
.article-body h2 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--article-heading);
    margin: 3rem 0 1.25rem 0;
    padding-top: 1.5rem;
    border-top: 1px solid var(--article-border);
    letter-spacing: -0.01em;
    scroll-margin-top: 100px;
}

.article-body h2:first-child {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
}

.article-body h3 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--article-text);
    margin: 2rem 0 1rem 0;
    scroll-margin-top: 100px;
}

/* Lists */
.article-body ul,
.article-body ol {
    margin: 1.5rem 0;
    padding-left: 1.5rem;
}

.article-body li {
    margin-bottom: 0.75rem;
    padding-left: 0.5rem;
}

.article-body ul li::marker {
    color: var(--article-accent);
}

.article-body ol li::marker {
    color: var(--article-accent);
    font-weight: 600;
}

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

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

/* Strong & emphasis */
.article-body strong {
    font-weight: 600;
    color: var(--article-heading);
}

/* ═══════════════════════════════════════════════════
   SPECIAL BOXES
   ═══════════════════════════════════════════════════ */

/* Tip Box */
.tip-box {
    background: var(--article-accent-light);
    border-radius: 8px;
    padding: 1.25rem 1.5rem;
    margin: 2rem 0;
    border-left: 4px solid var(--article-accent);
}

.tip-box__header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-ui);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--article-accent);
    margin-bottom: 0.75rem;
}

.tip-box__header svg {
    width: 18px;
    height: 18px;
}

.tip-box p {
    margin: 0;
    font-size: 0.95rem;
}

/* Example Box */
.example-box {
    background: var(--article-code-bg);
    border: 1px solid var(--article-border);
    border-radius: 8px;
    padding: 1.25rem 1.5rem;
    margin: 2rem 0;
    position: relative;
}

.example-box::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--article-text-muted);
    border-radius: 8px 0 0 8px;
}

.example-box__header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-ui);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--article-text-muted);
    margin-bottom: 0.75rem;
}

.example-box__header svg {
    width: 18px;
    height: 18px;
}

.example-box p,
.example-box code {
    margin: 0;
    font-size: 0.95rem;
}

.example-box code {
    font-family: 'SF Mono', Monaco, monospace;
    background: white;
    padding: 0.75rem 1rem;
    display: block;
    border-radius: 4px;
    margin-top: 0.5rem;
    border: 1px solid var(--article-border);
}

/* Success/Info Box */
.info-box {
    background: var(--article-success-light);
    border-radius: 8px;
    padding: 1.25rem 1.5rem;
    margin: 2rem 0;
    border-left: 4px solid var(--article-success);
}

.info-box__header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-ui);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--article-success);
    margin-bottom: 0.75rem;
}

.info-box__header svg {
    width: 18px;
    height: 18px;
}

.info-box p {
    margin: 0;
    font-size: 0.95rem;
}

/* Warning Box */
.warning-box {
    background: var(--article-warning-light);
    border-radius: 8px;
    padding: 1.25rem 1.5rem;
    margin: 2rem 0;
    border-left: 4px solid var(--article-warning);
}

.warning-box__header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-ui);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--article-warning);
    margin-bottom: 0.75rem;
}

.warning-box__header svg {
    width: 18px;
    height: 18px;
}

.warning-box p {
    margin: 0;
    font-size: 0.95rem;
}

/* Key Takeaway Box */
.key-takeaway {
    background: linear-gradient(135deg, var(--article-accent-light) 0%, #F0FFF4 100%);
    border-radius: 12px;
    padding: 1.75rem;
    margin: 2.5rem 0;
    border: 1px solid var(--article-border);
    text-align: center;
}

.key-takeaway__icon {
    width: 48px;
    height: 48px;
    background: var(--article-surface);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.key-takeaway__icon svg {
    width: 24px;
    height: 24px;
    stroke: var(--article-accent);
}

.key-takeaway__title {
    font-family: var(--font-ui);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--article-accent);
    margin-bottom: 0.75rem;
}

.key-takeaway p {
    font-family: var(--font-heading);
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--article-heading);
    margin: 0;
    line-height: 1.5;
}

/* ═══════════════════════════════════════════════════
   TABLES
   ═══════════════════════════════════════════════════ */

.article-table-wrapper {
    overflow-x: auto;
    margin: 2rem 0;
    border-radius: 8px;
    border: 1px solid var(--article-border);
}

.article-table {
    width: 100%;
    border-collapse: collapse;
    font-family: var(--font-ui);
    font-size: 0.9rem;
}

.article-table th {
    background: var(--article-code-bg);
    font-weight: 600;
    text-align: left;
    padding: 1rem;
    color: var(--article-heading);
    border-bottom: 2px solid var(--article-border);
    white-space: nowrap;
}

.article-table td {
    padding: 0.875rem 1rem;
    border-bottom: 1px solid var(--article-border);
    color: var(--article-text);
}

.article-table tr:last-child td {
    border-bottom: none;
}

.article-table tr:nth-child(even) {
    background: var(--article-code-bg);
}

.article-table .highlight-row {
    background: var(--article-success-light) !important;
}

.article-table .highlight-row td {
    font-weight: 500;
}

/* ═══════════════════════════════════════════════════
   CARDS GRID
   ═══════════════════════════════════════════════════ */

.article-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.25rem;
    margin: 2rem 0;
}

.article-card {
    background: var(--article-surface);
    border: 1px solid var(--article-border);
    border-radius: 8px;
    padding: 1.25rem;
}

.article-card--accent {
    border-top: 3px solid var(--article-accent);
}

.article-card--success {
    border-top: 3px solid var(--article-success);
}

.article-card--warning {
    border-top: 3px solid var(--article-warning);
}

.article-card__icon {
    width: 40px;
    height: 40px;
    background: var(--article-accent-light);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
}

.article-card__icon svg {
    width: 20px;
    height: 20px;
    stroke: var(--article-accent);
}

.article-card h4 {
    font-family: var(--font-ui);
    font-size: 1rem;
    font-weight: 600;
    color: var(--article-heading);
    margin: 0 0 0.5rem 0;
}

.article-card p {
    font-size: 0.9rem;
    color: var(--article-text-muted);
    margin: 0;
    line-height: 1.5;
}

/* ═══════════════════════════════════════════════════
   STEPS / PROCESS FLOW
   ═══════════════════════════════════════════════════ */

.article-steps {
    margin: 2rem 0;
}

.article-step {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--article-border);
}

.article-step:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.article-step__number {
    width: 36px;
    height: 36px;
    background: var(--article-accent);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-ui);
    font-weight: 700;
    font-size: 0.9rem;
    flex-shrink: 0;
}

.article-step__content h4 {
    font-family: var(--font-ui);
    font-size: 1rem;
    font-weight: 600;
    color: var(--article-heading);
    margin: 0 0 0.5rem 0;
}

.article-step__content p {
    font-size: 0.95rem;
    color: var(--article-text-muted);
    margin: 0;
    line-height: 1.6;
}

/* ═══════════════════════════════════════════════════
   CTA SECTION
   ═══════════════════════════════════════════════════ */

.article-cta {
    background: var(--article-heading);
    border-radius: 12px;
    padding: 2rem;
    margin: 3rem 0 2rem;
    text-align: center;
}

.article-cta h3 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
    color: white;
    margin: 0 0 0.75rem 0;
}

.article-cta p {
    font-family: var(--font-ui);
    color: rgba(255, 255, 255, 0.85);
    margin: 0 0 1.25rem 0;
    font-size: 0.95rem;
}

.article-cta .btn-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: white;
    color: var(--article-heading);
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    font-family: var(--font-ui);
    font-weight: 600;
    font-size: 0.9rem;
    text-decoration: none;
}

.article-cta .btn-cta:hover {
    background: var(--article-accent-light);
}

.article-cta .btn-cta svg {
    width: 16px;
    height: 16px;
}

/* ═══════════════════════════════════════════════════
   ARTICLE NAVIGATION (Bottom)
   ═══════════════════════════════════════════════════ */

.article-nav-bottom {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--article-border);
}

@media (max-width: 640px) {
    .article-nav-bottom {
        flex-direction: column;
    }
}

.article-nav-link {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    padding: 1rem;
    background: var(--article-code-bg);
    border: 1px solid var(--article-border);
    border-radius: 8px;
    text-decoration: none;
    flex: 1;
    max-width: 280px;
}

@media (max-width: 640px) {
    .article-nav-link {
        max-width: none;
    }
}

.article-nav-link:hover {
    border-color: var(--article-accent);
    background: var(--article-accent-light);
}

.article-nav-link__label {
    font-family: var(--font-ui);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--article-text-muted);
}

.article-nav-link__title {
    font-family: var(--font-ui);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--article-heading);
}

.article-nav-link--next {
    text-align: right;
    margin-left: auto;
}

/* Back to articles */
.article-back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-ui);
    font-size: 0.875rem;
    color: var(--article-text-muted);
    text-decoration: none;
    margin-top: 1.5rem;
}

.article-back-link:hover {
    color: var(--article-accent);
}

.article-back-link svg {
    width: 16px;
    height: 16px;
}

/* ═══════════════════════════════════════════════════
   FOOTER (Article specific)
   ═══════════════════════════════════════════════════ */

.article-footer {
    background: var(--article-surface);
    border-top: 1px solid var(--article-border);
    margin-top: 3rem;
    padding: 2rem 0;
}

.article-footer .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    text-align: center;
}

.article-footer p {
    font-family: var(--font-ui);
    font-size: 0.875rem;
    color: var(--article-text-muted);
    margin: 0;
}

/* ═══════════════════════════════════════════════════
   DARK MODE
   ═══════════════════════════════════════════════════ */

@media (prefers-color-scheme: dark) {
    :root {
        --article-bg: #0F172A;
        --article-surface: #1E293B;
        --article-text: #E2E8F0;
        --article-text-muted: #94A3B8;
        --article-heading: #F1F5F9;
        --article-accent: #60A5FA;
        --article-accent-light: rgba(96, 165, 250, 0.15);
        --article-success: #4ADE80;
        --article-success-light: rgba(74, 222, 128, 0.15);
        --article-warning: #FBBF24;
        --article-warning-light: rgba(251, 191, 36, 0.15);
        --article-border: #334155;
        --article-code-bg: #0F172A;
    }
    
    .article-cta {
        background: var(--article-accent);
    }
    
    .article-cta h3,
    .article-cta p {
        color: #0F172A;
    }
    
    .article-cta .btn-cta {
        background: #0F172A;
        color: white;
    }
}

/* ═══════════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════════ */

@media (max-width: 768px) {
    .article-hero-compact {
        padding: 1.5rem 0;
    }
    
    .article-hero-compact h1 {
        font-size: 1.5rem;
    }
    
    .article-hero__lead {
        font-size: 1rem;
    }
    
    .article-body {
        font-size: 1rem;
    }
    
    .article-body h2 {
        font-size: 1.25rem;
        margin: 2rem 0 1rem 0;
    }
    
    .article-body h3 {
        font-size: 1.1rem;
    }
    
    .article-cards-grid {
        grid-template-columns: 1fr;
    }
}