/* Professional Article Design System */

/* Article Layout */
.article-main {
    margin-top: 80px;
    min-height: 100vh;
    background: var(--neutral-50);
}

.article-container {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-3xl) var(--spacing-xl);
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.breadcrumb {
    margin-bottom: var(--spacing-xl);
    font-size: 0.875rem;
    color: var(--neutral-500);
    font-weight: 500;
}

.breadcrumb a {
    color: var(--primary-600);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.breadcrumb a:hover {
    color: var(--primary-700);
}

/* Article Header */
.article-header {
    margin-bottom: var(--spacing-3xl);
    text-align: center;
    border-bottom: 1px solid var(--neutral-200);
    padding-bottom: var(--spacing-2xl);
}

.article-meta-top {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    align-items: center;
    flex-wrap: wrap;
}

.article-meta-top .category {
    background: var(--primary-100);
    color: var(--primary-700);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.reading-time {
    color: var(--neutral-500);
    font-size: 0.875rem;
    padding: 0.5rem 1rem;
    background: var(--neutral-100);
    border-radius: var(--radius-md);
    font-weight: 500;
}

.article-header h1 {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 800;
    color: var(--neutral-900);
    line-height: 1.1;
    letter-spacing: -0.025em;
    margin-bottom: var(--spacing-xl);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.article-author-info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
}

.author-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-500) 0%, var(--accent-600) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: white;
    font-weight: 700;
    border: 3px solid white;
    box-shadow: var(--shadow-md);
}

.author-details {
    text-align: left;
}

.author-name {
    font-family: var(--font-display);
    font-weight: 700;
    color: var(--neutral-900);
    margin-bottom: 0.25rem;
    font-size: 1.125rem;
}

.author-title {
    font-size: 0.875rem;
    color: var(--neutral-600);
    margin-bottom: 0.25rem;
    font-weight: 500;
}

.article-date {
    font-size: 0.875rem;
    color: var(--neutral-500);
    font-weight: 500;
}

/* Article Content */
.article-content {
    margin-bottom: var(--spacing-3xl);
}

.article-image-hero {
    margin-bottom: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.image-placeholder {
    height: 400px;
    background: linear-gradient(135deg, var(--neutral-800) 0%, var(--neutral-700) 100%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: white;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.image-placeholder::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 30% 70%, rgba(59, 130, 246, 0.2) 0%, transparent 50%),
        radial-gradient(circle at 70% 30%, rgba(14, 165, 233, 0.2) 0%, transparent 50%);
}

.image-icon {
    font-size: 5rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.9;
    position: relative;
    z-index: 1;
}

.image-placeholder p {
    font-size: 1.25rem;
    opacity: 0.8;
    margin: 0;
    position: relative;
    z-index: 1;
    font-weight: 500;
}

/* Article Body Typography */
.article-body {
    line-height: 1.8;
    color: var(--neutral-700);
    font-size: 1.125rem;
    font-weight: 400;
}

.lead-paragraph {
    font-size: 1.375rem;
    font-weight: 400;
    line-height: 1.7;
    color: var(--neutral-600);
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-xl);
    background: var(--primary-50);
    border-left: 4px solid var(--primary-500);
    border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
    font-style: italic;
}

.article-body h2 {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--neutral-900);
    margin: var(--spacing-3xl) 0 var(--spacing-lg) 0;
    border-bottom: 2px solid var(--neutral-200);
    padding-bottom: var(--spacing-md);
    letter-spacing: -0.025em;
}

.article-body h2:first-child {
    margin-top: 0;
}

.article-body h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--neutral-900);
    margin: var(--spacing-2xl) 0 var(--spacing-lg) 0;
    letter-spacing: -0.025em;
}

.article-body h4 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--neutral-900);
    margin: var(--spacing-xl) 0 var(--spacing-md) 0;
    letter-spacing: -0.025em;
}

.article-body p {
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

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

.article-body li {
    margin-bottom: var(--spacing-sm);
    line-height: 1.7;
}

.article-body li strong {
    color: var(--neutral-900);
    font-weight: 600;
}

.article-body blockquote {
    background: var(--neutral-50);
    border-left: 4px solid var(--primary-500);
    margin: var(--spacing-2xl) 0;
    padding: var(--spacing-xl);
    border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
    font-style: italic;
    position: relative;
}

.article-body blockquote::before {
    content: '"';
    position: absolute;
    top: -10px;
    left: var(--spacing-xl);
    font-size: 4rem;
    color: var(--primary-300);
    line-height: 1;
    font-family: Georgia, serif;
}

.article-body blockquote p {
    margin-bottom: var(--spacing-md);
    font-size: 1.1875rem;
    color: var(--neutral-600);
    line-height: 1.7;
}

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

.article-body blockquote cite {
    display: block;
    text-align: right;
    font-size: 0.9375rem;
    color: var(--neutral-500);
    font-style: normal;
    font-weight: 600;
    margin-top: var(--spacing-md);
}

.case-study {
    background: var(--error-50);
    border: 1px solid var(--error-200);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin: var(--spacing-2xl) 0;
    position: relative;
}

.case-study::before {
    content: '⚠';
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    font-size: 1.5rem;
    opacity: 0.5;
}

.case-study h4 {
    color: var(--error-700);
    margin-top: 0;
    margin-bottom: var(--spacing-lg);
    font-family: var(--font-display);
    font-weight: 700;
}

.case-study p {
    color: var(--neutral-700);
    margin-bottom: 0;
    line-height: 1.7;
}

/* Article Footer */
.article-footer {
    border-top: 2px solid var(--neutral-200);
    padding-top: var(--spacing-2xl);
    margin-top: var(--spacing-3xl);
}

.article-tags {
    margin-bottom: var(--spacing-2xl);
}

.tag {
    display: inline-block;
    background: var(--neutral-100);
    color: var(--neutral-700);
    padding: 0.5rem 0.875rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    margin-right: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    transition: all var(--transition-fast);
}

.tag:hover {
    background: var(--primary-100);
    color: var(--primary-700);
}

.share-section {
    margin-bottom: var(--spacing-2xl);
}

.share-section h4 {
    margin-bottom: var(--spacing-lg);
    color: var(--neutral-900);
    font-family: var(--font-display);
    font-weight: 700;
}

.share-buttons {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.share-btn {
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-lg);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.875rem;
    transition: all var(--transition-normal);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.share-btn.twitter {
    background: #1da1f2;
    color: white;
}

.share-btn.linkedin {
    background: #0077b5;
    color: white;
}

.share-btn.reddit {
    background: #ff4500;
    color: white;
}

.share-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Author Bio */
.author-bio {
    display: flex;
    gap: var(--spacing-xl);
    background: var(--neutral-50);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--neutral-200);
}

.author-avatar-large {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-500) 0%, var(--accent-600) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: white;
    font-weight: 700;
    flex-shrink: 0;
    box-shadow: var(--shadow-lg);
}

.bio-content h4 {
    margin-top: 0;
    margin-bottom: var(--spacing-md);
    color: var(--neutral-900);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.25rem;
}

.bio-content p {
    color: var(--neutral-600);
    margin: 0;
    line-height: 1.7;
    font-size: 0.9375rem;
}

/* Related Articles */
.related-articles {
    background: var(--neutral-50);
    padding: var(--spacing-3xl) 0;
    margin-top: var(--spacing-3xl);
}

.related-articles h3 {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    font-size: 2rem;
    color: var(--neutral-900);
    font-family: var(--font-display);
    font-weight: 700;
    letter-spacing: -0.025em;
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

.related-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    transition: all var(--transition-normal);
    border: 1px solid var(--neutral-200);
    box-shadow: var(--shadow-md);
}

.related-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-300);
}

.related-card a {
    text-decoration: none;
    color: inherit;
}

.related-image {
    font-size: 3rem;
    margin-bottom: var(--spacing-lg);
    text-align: center;
    color: var(--primary-500);
}

.related-card h4 {
    margin-bottom: var(--spacing-md);
    color: var(--neutral-900);
    font-size: 1.1875rem;
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.3;
}

.related-card p {
    color: var(--neutral-600);
    margin: 0;
    font-size: 0.9375rem;
    line-height: 1.6;
}

/* Logo link styling */
.logo a {
    text-decoration: none;
    color: inherit;
    transition: opacity var(--transition-fast);
}

.logo a:hover {
    opacity: 0.8;
}

/* Reading Progress Bar */
.reading-progress {
    position: fixed;
    top: 80px;
    left: 0;
    width: 0%;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-500), var(--accent-600));
    z-index: 1001;
    transition: width 0.1s ease;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .article-container {
        margin: var(--spacing-lg);
        padding: var(--spacing-2xl) var(--spacing-lg);
    }
    
    .related-grid {
        padding: 0 var(--spacing-lg);
    }
}

@media (max-width: 768px) {
    .article-container {
        margin: 0;
        border-radius: 0;
        padding: var(--spacing-xl) var(--spacing-md);
    }
    
    .article-header h1 {
        font-size: 2.25rem;
    }
    
    .article-meta-top {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .article-author-info {
        flex-direction: column;
        text-align: center;
    }
    
    .author-details {
        text-align: center;
    }
    
    .article-body {
        font-size: 1rem;
    }
    
    .lead-paragraph {
        font-size: 1.1875rem;
        padding: var(--spacing-lg);
    }
    
    .author-bio {
        flex-direction: column;
        text-align: center;
    }
    
    .share-buttons {
        justify-content: center;
    }
    
    .related-grid {
        grid-template-columns: 1fr;
        padding: 0 var(--spacing-md);
    }

    .case-study {
        padding: var(--spacing-lg);
    }
    
    .case-study::before {
        top: var(--spacing-md);
        right: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .article-header h1 {
        font-size: 1.875rem;
    }
    
    .author-bio {
        padding: var(--spacing-lg);
    }
    
    .image-placeholder {
        height: 250px;
    }
    
    .image-icon {
        font-size: 3rem;
    }
}

/* Performance optimizations */
.related-card,
.case-study {
    will-change: transform;
}

/* Accessibility */
.article-body a {
    color: var(--primary-600);
    font-weight: 600;
    text-decoration: underline;
    text-decoration-color: var(--primary-300);
    text-underline-offset: 2px;
    transition: all var(--transition-fast);
}

.article-body a:hover {
    color: var(--primary-700);
    text-decoration-color: var(--primary-600);
}

.article-body a:focus {
    outline: 2px solid var(--primary-500);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}