/* ========================================
   KallyAI Blog Styles
   Extends main styles.css
   ======================================== */

/* ========== Blog Hero ========== */
.blog-hero {
    position: relative;
    padding: 160px 0 80px;
    text-align: center;
    overflow: hidden;
}

.blog-hero-content {
    position: relative;
    z-index: 1;
    max-width: 700px;
    margin: 0 auto;
}

.blog-hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.1;
}

.blog-hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ========== Category Filter ========== */
.blog-categories {
    padding: 0 0 40px;
}

.category-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
}

.category-pill {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 10px 20px;
    border-radius: var(--border-radius-full);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: inherit;
}

.category-pill:hover {
    border-color: var(--border-hover);
    color: var(--text-primary);
}

.category-pill.active {
    background: var(--accent-gradient);
    border-color: transparent;
    color: white;
}

/* ========== Blog Grid ========== */
.blog-grid-section {
    padding: 40px 0 80px;
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 32px;
}

/* ========== Article Card ========== */
.article-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
}

.article-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.article-card.coming-soon {
    opacity: 0.6;
    pointer-events: none;
}

.article-card.featured {
    grid-column: 1 / -1;
    flex-direction: row;
}

.article-card-link {
    display: flex;
    flex-direction: column;
    flex: 1;
    text-decoration: none;
    color: inherit;
}

.article-card.featured .article-card-link {
    flex-direction: row;
}

.article-card-image {
    position: relative;
    aspect-ratio: 16 / 10;
    background: var(--bg-secondary);
    overflow: hidden;
}

.article-card.featured .article-card-image {
    width: 45%;
    aspect-ratio: auto;
    min-height: 300px;
}

.article-card-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
}

.placeholder-emoji {
    font-size: 4rem;
    opacity: 0.5;
}

.article-badge {
    position: absolute;
    top: 16px;
    left: 16px;
    background: var(--accent-gradient);
    color: white;
    padding: 6px 12px;
    border-radius: var(--border-radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.article-card-content {
    padding: 24px;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.article-card.featured .article-card-content {
    width: 55%;
    padding: 32px;
    justify-content: center;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    font-size: 0.85rem;
}

.article-category {
    color: var(--accent-cyan);
    font-weight: 500;
}

.article-date {
    color: var(--text-muted);
}

.article-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 12px;
    line-height: 1.4;
    color: var(--text-primary);
}

.article-card.featured .article-title {
    font-size: 1.75rem;
}

.article-excerpt {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 16px;
    flex: 1;
}

.article-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: auto;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.article-author {
    display: flex;
    align-items: center;
    gap: 10px;
}

.author-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
}

.author-name {
    font-size: 0.9rem;
    font-weight: 500;
}

.article-read-time {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ========== Newsletter Section ========== */
.blog-newsletter {
    padding: 60px 0;
}

.newsletter-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 48px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
}

.newsletter-content {
    flex: 1;
}

.newsletter-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.newsletter-description {
    color: var(--text-secondary);
    font-size: 1rem;
}

.newsletter-form {
    display: flex;
    gap: 12px;
}

.newsletter-input {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 14px 20px;
    font-size: 1rem;
    color: var(--text-primary);
    font-family: inherit;
    width: 280px;
    transition: border-color var(--transition-fast);
}

.newsletter-input::placeholder {
    color: var(--text-muted);
}

.newsletter-input:focus {
    outline: none;
    border-color: var(--accent-cyan);
}

/* ========== Reading Progress Bar ========== */
.reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: var(--accent-gradient);
    width: 0%;
    z-index: 9999;
    transition: width 0.1s linear;
}

/* ========== Article Page Styles ========== */
.article-header {
    padding: 160px 0 60px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.article-header-content {
    max-width: 800px;
    margin: 0 auto;
}

.back-to-blog {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 24px;
    transition: color var(--transition-fast);
}

.back-to-blog:hover {
    color: var(--accent-cyan);
}

.article-meta-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
}

.article-category-tag {
    background: var(--accent-gradient);
    color: white;
    padding: 6px 14px;
    border-radius: var(--border-radius-full);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.article-read-time-header {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.article-title-main {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
}

.article-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 32px;
}

.article-author-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.author-avatar-large {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    object-fit: cover;
}

.author-info {
    flex: 1;
}

.author-name-large {
    font-weight: 600;
    font-size: 1rem;
    display: block;
}

.author-title {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.article-date-header {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Share Buttons */
.share-buttons {
    display: flex;
    align-items: center;
    gap: 12px;
}

.share-label {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.share-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    cursor: pointer;
}

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

/* ========== Article Body ========== */
.article-body {
    padding: 80px 0;
}

.article-content {
    max-width: 720px;
    margin: 0 auto;
    font-size: 1.125rem;
    line-height: 1.8;
}

.article-lead {
    font-size: 1.375rem;
    color: var(--text-primary);
    font-weight: 500;
    line-height: 1.6;
    margin-bottom: 2rem;
    padding-left: 1.5rem;
    border-left: 3px solid var(--accent-cyan);
}

.article-content p {
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
}

.article-content h2 {
    font-size: 1.75rem;
    font-weight: 600;
    margin: 3rem 0 1.5rem;
    color: var(--text-primary);
}

.article-content h3 {
    font-size: 1.375rem;
    font-weight: 600;
    margin: 2.5rem 0 1rem;
    color: var(--text-primary);
}

.article-content strong {
    color: var(--text-primary);
    font-weight: 600;
}

.article-content blockquote {
    margin: 2rem 0;
    padding: 1.5rem 2rem;
    background: var(--bg-card);
    border-left: 4px solid var(--accent-cyan);
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
}

.article-content blockquote p {
    font-size: 1.25rem;
    font-style: italic;
    color: var(--text-primary);
    margin-bottom: 0;
}

.article-content ul,
.article-content ol {
    margin: 1.5rem 0;
    padding-left: 1.5rem;
}

.article-content li {
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
}

.article-content a {
    color: var(--accent-cyan);
    text-decoration: underline;
    text-underline-offset: 3px;
}

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

/* ========== Article CTA Box ========== */
.article-cta-box {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 32px;
    margin: 3rem 0;
    text-align: center;
}

.cta-box-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.cta-logo {
    width: 48px;
    height: 48px;
}

.article-cta-box h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.article-cta-box p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.article-cta-box .btn {
    margin-top: 8px;
}

/* ========== Author Bio Section ========== */
.author-bio-section {
    padding: 0 0 80px;
    border-bottom: 1px solid var(--border-color);
}

.author-bio-card {
    max-width: 720px;
    margin: 0 auto;
    display: flex;
    gap: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 32px;
}

.author-bio-avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
}

.author-bio-content {
    flex: 1;
}

.author-bio-name {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.author-bio-title {
    color: var(--accent-cyan);
    font-size: 0.9rem;
    margin-bottom: 12px;
}

.author-bio-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 16px;
}

.author-bio-links {
    display: flex;
    gap: 16px;
}

.author-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

.author-link:hover {
    color: var(--accent-cyan);
}

/* ========== Responsive ========== */
@media (max-width: 900px) {
    .article-card.featured {
        flex-direction: column;
    }
    
    .article-card.featured .article-card-link {
        flex-direction: column;
    }
    
    .article-card.featured .article-card-image {
        width: 100%;
        min-height: 200px;
    }
    
    .article-card.featured .article-card-content {
        width: 100%;
    }
    
    .newsletter-card {
        flex-direction: column;
        text-align: center;
    }
    
    .newsletter-form {
        flex-direction: column;
        width: 100%;
    }
    
    .newsletter-input {
        width: 100%;
    }
}

@media (max-width: 768px) {
    .blog-hero {
        padding: 140px 0 60px;
    }
    
    .blog-grid {
        grid-template-columns: 1fr;
    }
    
    .article-header {
        padding: 120px 0 40px;
    }
    
    .article-author-header {
        flex-wrap: wrap;
    }
    
    .article-date-header {
        width: 100%;
        margin-top: 8px;
    }
    
    .share-buttons {
        margin-top: 16px;
        width: 100%;
    }
    
    .article-body {
        padding: 60px 0;
    }
    
    .article-content {
        font-size: 1.0625rem;
    }
    
    .author-bio-card {
        flex-direction: column;
        text-align: center;
    }
    
    .author-bio-avatar {
        margin: 0 auto;
    }
    
    .author-bio-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .category-pills {
        gap: 8px;
    }
    
    .category-pill {
        padding: 8px 14px;
        font-size: 0.8rem;
    }
    
    .article-card-content {
        padding: 20px;
    }
    
    .newsletter-card {
        padding: 32px 24px;
    }
}

/* ========================================
   Article Content Extended Styles
   ======================================== */

/* Table of Contents Box */
.toc-box {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 24px 32px;
    margin: 2rem 0 3rem;
}

.toc-box h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.toc-box ol {
    margin: 0;
    padding-left: 1.5rem;
}

.toc-box li {
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.toc-box a {
    color: var(--accent-cyan);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.toc-box a:hover {
    color: var(--accent-purple);
    text-decoration: underline;
}

/* Statistics Highlight Box */
.stats-highlight {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin: 2rem 0;
}

.stat-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 24px;
    text-align: center;
    transition: all var(--transition-normal);
}

.stat-item:hover {
    border-color: var(--accent-cyan);
    transform: translateY(-2px);
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
    margin-bottom: 8px;
}

.stat-desc {
    display: block;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.4;
    margin-bottom: 8px;
}

.stat-source {
    display: block;
    color: var(--text-muted);
    font-size: 0.8rem;
}

.stat-source a {
    color: var(--text-muted);
    text-decoration: underline;
}

.stat-source a:hover {
    color: var(--accent-cyan);
}

/* Article Tables */
.article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
    background: var(--bg-card);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.article-content th,
.article-content td {
    padding: 16px 20px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.article-content th {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.95rem;
}

.article-content td {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

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

.article-content tr:hover td {
    background: rgba(0, 212, 255, 0.03);
}

/* References List */
.references {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 24px 32px;
    margin: 2rem 0;
}

.references li {
    margin-bottom: 12px;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.references li:last-child {
    margin-bottom: 0;
}

.references strong {
    color: var(--text-primary);
}

.references a {
    color: var(--accent-cyan);
    word-break: break-word;
}

/* H2 Anchor Links */
.article-content h2[id] {
    scroll-margin-top: 100px;
}

.article-content h3[id] {
    scroll-margin-top: 100px;
}

/* Responsive for new elements */
@media (max-width: 768px) {
    .stats-highlight {
        grid-template-columns: 1fr 1fr;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .toc-box {
        padding: 20px 24px;
    }
    
    .article-content table {
        font-size: 0.9rem;
    }
    
    .article-content th,
    .article-content td {
        padding: 12px 14px;
    }
}

@media (max-width: 480px) {
    .stats-highlight {
        grid-template-columns: 1fr;
    }
    
    .references {
        padding: 20px 24px;
    }
}