/* css/blog.css - Premium styling for ThermoFluidCalc Blog & Tutorials */

:root {
    --blog-font-serif: "Georgia", "Times New Roman", serif;
    --blog-primary: #1a5ff5;
    --blog-primary-glow: rgba(26, 95, 245, 0.15);
    --blog-success: #10b981;
    --blog-surface: #ffffff;
    --blog-bg: #f8fafc;
    --blog-border: #e2e8f0;
    --blog-text-primary: #0f172a;
    --blog-text-secondary: #475569;
    --blog-card-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05), 0 2px 8px -1px rgba(15, 23, 42, 0.03);
    --blog-card-hover-shadow: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 10px 10px -5px rgba(15, 23, 42, 0.04);
}

[data-theme="dark"] {
    --blog-surface: #1e293b;
    --blog-bg: #0f172a;
    --blog-border: #334155;
    --blog-text-primary: #f8fafc;
    --blog-text-secondary: #94a3b8;
    --blog-card-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.2), 0 2px 8px -1px rgba(0, 0, 0, 0.1);
    --blog-card-hover-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
}

/* Base Blog Layout */
.blog-layout {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: var(--space-8);
    margin-top: var(--space-6);
    align-items: start;
}

@media (max-width: 992px) {
    .blog-layout {
        grid-template-columns: 1fr;
    }
}

/* Category Filter Bar */
.blog-categories {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: var(--space-6);
    border-bottom: 1px solid var(--blog-border);
    padding-bottom: var(--space-4);
}

.category-pill {
    padding: 8px 18px;
    border-radius: 99px;
    background: var(--blog-surface);
    border: 1px solid var(--blog-border);
    color: var(--blog-text-secondary);
    text-decoration: none;
    font-size: 0.88rem;
    font-weight: 600;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
}

.category-pill:hover, .category-pill.active {
    background: var(--blog-primary);
    color: #ffffff;
    border-color: var(--blog-primary);
    box-shadow: 0 4px 12px var(--blog-primary-glow);
    transform: translateY(-1px);
}

/* Search Bar styling */
.blog-search-container {
    margin-bottom: var(--space-6);
    position: relative;
    max-width: 450px;
}

.blog-search-input {
    width: 100%;
    padding: 12px 20px;
    padding-left: 45px;
    border-radius: 8px;
    border: 1px solid var(--blog-border);
    background: var(--blog-surface);
    color: var(--blog-text-primary);
    font-size: 0.95rem;
    transition: all 0.2s ease;
}

.blog-search-input:focus {
    outline: none;
    border-color: var(--blog-primary);
    box-shadow: 0 0 0 3px var(--blog-primary-glow);
}

.blog-search-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--blog-text-secondary);
    pointer-events: none;
}

/* Blog List & Cards */
.blog-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.blog-card {
    background: var(--blog-surface);
    border: 1px solid var(--blog-border);
    border-radius: 12px;
    padding: var(--space-6);
    box-shadow: var(--blog-card-shadow);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.blog-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--blog-card-hover-shadow);
}

.blog-card-header {
    display: flex;
    flex-direction: column;
    gap: 6px;
    border-bottom: 1px solid var(--blog-border);
    padding-bottom: 12px;
}

.blog-card-title-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 12px;
    flex-wrap: wrap;
}

.blog-card-title {
    font-size: 1.45rem;
    font-weight: 800;
    line-height: 1.3;
    margin: 0;
    flex: 1;
    min-width: 250px;
}

.blog-card-title a {
    color: var(--blog-text-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.blog-card-title a:hover {
    color: var(--blog-primary);
}

.post-meta-badge {
    display: inline-block;
    padding: 4px 10px;
    background: var(--blog-primary-glow);
    color: var(--blog-primary);
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    width: fit-content;
}

.blog-card-meta {
    display: flex;
    gap: 16px;
    color: var(--blog-text-secondary);
    font-size: 0.82rem;
    font-weight: 500;
    flex-wrap: wrap;
    align-items: center;
}

.blog-card-body {
    display: grid;
    grid-template-columns: 180px 1fr;
    gap: var(--space-6);
    align-items: start;
    padding-top: 4px;
}

@media (max-width: 600px) {
    .blog-card-body {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }
}

.blog-card-img-wrapper {
    width: 180px;
    height: 120px;
    border-radius: 8px;
    overflow: hidden;
    flex-shrink: 0;
    border: 1px solid var(--blog-border);
}

@media (max-width: 600px) {
    .blog-card-img-wrapper {
        width: 100%;
        height: 180px;
    }
}

.blog-card-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.blog-card:hover .blog-card-img {
    transform: scale(1.05);
}

.blog-card-desc-col {
    display: flex;
    flex-direction: column;
    gap: 12px;
    height: 100%;
    justify-content: space-between;
}

.blog-card-excerpt {
    color: var(--blog-text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin: 0;
}

.blog-read-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--blog-primary);
    text-decoration: none;
    font-weight: 700;
    font-size: 0.9rem;
    transition: transform 0.2s ease;
    width: fit-content;
}

.blog-read-link:hover {
    transform: translateX(4px);
    text-decoration: underline;
}

/* Sidebar Widgets */
.blog-sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.widget {
    background: var(--blog-surface);
    border: 1px solid var(--blog-border);
    border-radius: 8px;
    padding: var(--space-5);
}

.widget-title {
    font-size: 0.95rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--blog-text-primary);
    margin-bottom: var(--space-4);
    border-bottom: 2px solid var(--blog-border);
    padding-bottom: 6px;
}

.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.tag-item {
    font-size: 0.78rem;
    padding: 4px 10px;
    border-radius: 4px;
    background: var(--blog-bg);
    border: 1px solid var(--blog-border);
    color: var(--blog-text-secondary);
    text-decoration: none;
    transition: all 0.2s ease;
}

.tag-item:hover {
    background: var(--blog-primary-glow);
    color: var(--blog-primary);
    border-color: var(--blog-primary);
}

.newsletter-box {
    background: linear-gradient(135deg, rgba(26,95,245,0.08) 0%, rgba(26,95,245,0.02) 100%);
    border-color: rgba(26,95,245,0.2);
}

.newsletter-box h4 {
    margin-bottom: 8px;
    color: var(--blog-text-primary);
}

.newsletter-box p {
    font-size: 0.82rem;
    color: var(--blog-text-secondary);
    margin-bottom: 12px;
}

.newsletter-form input {
    width: 100%;
    padding: 8px 12px;
    border-radius: 6px;
    border: 1px solid var(--blog-border);
    margin-bottom: 8px;
    font-size: 0.85rem;
}

.newsletter-form button {
    width: 100%;
    padding: 8px;
    background: var(--blog-primary);
    color: #fff;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
}

/* Post view styling */
.post-header {
    background: var(--blog-surface);
    border-bottom: 1px solid var(--blog-border);
    padding: var(--space-8) 0;
    margin-bottom: var(--space-8);
}

.post-title {
    font-size: 2.3rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--space-4);
    color: var(--blog-text-primary);
}

.post-article {
    background: var(--blog-surface);
    border: 1px solid var(--blog-border);
    border-radius: 12px;
    padding: var(--space-8);
    box-shadow: var(--blog-card-shadow);
}

.post-content {
    font-family: var(--blog-font-serif);
    font-size: 1.15rem;
    line-height: 1.75;
    color: var(--blog-text-primary);
}

.post-content p {
    margin-bottom: var(--space-5);
}

.post-content h3 {
    font-family: var(--font-sans);
    font-size: 1.5rem;
    font-weight: 700;
    margin-top: var(--space-6);
    margin-bottom: var(--space-3);
    color: var(--blog-text-primary);
}

.post-content ul, .post-content ol {
    margin-bottom: var(--space-5);
    padding-left: var(--space-6);
}

.post-content li {
    margin-bottom: 6px;
}

/* Equations and math formatting */
.blog-equation {
    display: flex;
    justify-content: center;
    margin: var(--space-6) 0;
    padding: var(--space-4);
    background: var(--blog-bg);
    border-radius: 8px;
    overflow-x: auto;
}

/* Tables inside blog */
.blog-table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--space-6) 0;
    font-family: var(--font-sans);
    font-size: 0.95rem;
}

.blog-table th, .blog-table td {
    padding: 12px;
    border-bottom: 1px solid var(--blog-border);
    text-align: left;
}

.blog-table th {
    background: var(--blog-bg);
    font-weight: 700;
}

/* Blog Back button */
.blog-back-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--blog-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: var(--space-6);
    transition: transform 0.2s ease;
}

.blog-back-btn:hover {
    transform: translateX(-4px);
}

/* Admin Blog Manager Form Elements */
.admin-blog-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--surface);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    overflow: hidden;
    margin-top: var(--space-4);
}

.admin-blog-table th, .admin-blog-table td {
    padding: var(--space-3) var(--space-4);
    text-align: left;
    border-bottom: 1px solid var(--border-light);
}

.admin-blog-table th {
    background: rgba(255, 255, 255, 0.02);
    font-weight: 700;
}

.admin-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 4px;
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    border: 1px solid transparent;
}

.admin-btn-primary {
    background: var(--primary);
    color: #fff;
}

.admin-btn-danger {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    border-color: rgba(239, 68, 68, 0.2);
}

.admin-btn-danger:hover {
    background: #ef4444;
    color: #fff;
}

.admin-btn-edit {
    background: rgba(245, 158, 11, 0.1);
    color: #f59e0b;
    border-color: rgba(245, 158, 11, 0.2);
}

.admin-btn-edit:hover {
    background: #f59e0b;
    color: #fff;
}

.blog-form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
    margin-top: var(--space-4);
}

.blog-form-field {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.blog-form-field.full-width {
    grid-column: span 2;
}

.blog-form-field label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.blog-form-field input, .blog-form-field select, .blog-form-field textarea {
    padding: 10px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-light);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.blog-form-field textarea {
    resize: vertical;
    font-family: var(--font-sans);
}