/* css/blog.css */

/* ====================================================
   VARIABLES & COMMON (Inspired by Coursera Blog)
==================================================== */
:root {
    --blog-text: #373a3c;
    --blog-heading: #1F1F1F;
    --blog-bg: #ffffff;
    --blog-border: #e2e6ea;
    --blog-radius: 8px;
    --blog-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    --blog-shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.08);
    
    /* CTA Colors (Professional) */
    --cta-primary: #0056D2; /* Coursera Brand Blue */
    --cta-primary-hover: #0043A4;
    --cta-whatsapp: #25d366;
}

body {
    background-color: var(--blog-bg);
    color: var(--blog-text);
    font-family: 'Heebo', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.8;
    font-size: 18px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ====================================================
   BLOG HERO (HUB)
==================================================== */
.blog-hero {
    background-color: #F7F9FA;
    padding: 80px 20px;
    text-align: center;
    border-bottom: 1px solid var(--blog-border);
}
.blog-hero-label {
    display: inline-block;
    font-size: 0.8rem;
    text-transform: uppercase;
    font-weight: 700;
    color: #555;
    letter-spacing: 1.5px;
    margin-bottom: 20px;
}
.blog-hero h1 {
    font-size: clamp(2.2rem, 5vw, 3rem);
    color: var(--blog-heading);
    margin-bottom: 25px;
    font-weight: 800;
    line-height: 1.2;
}
.blog-hero p {
    font-size: 1.2rem;
    color: #4a4a4a;
    max-width: 650px;
    margin: 0 auto 35px;
    line-height: 1.6;
}
.blog-hero .btn-main {
    background-color: var(--cta-primary);
    color: #fff;
    padding: 14px 32px;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: background 0.2s ease;
    display: inline-block;
}
.blog-hero .btn-main:hover {
    background-color: var(--cta-primary-hover);
    color: #fff;
}

/* ====================================================
   BLOG GRID (HUB) - Strict 2 Columns on Desktop
==================================================== */
.blog-grid-container {
    max-width: 1000px;
    margin: 80px auto;
    padding: 0 20px;
}

.blog-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}

/* Tablet / small laptop */
@media (min-width: 768px) {
    .blog-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
    }
}

/* Laptop and up: STRICTLY 2 COLUMNS */
@media (min-width: 992px) {
    .blog-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 40px;
    }
}

.blog-card {
    background: #fff;
    border: 1px solid var(--blog-border);
    border-radius: var(--blog-radius);
    overflow: hidden;
    transition: box-shadow 0.2s ease, transform 0.2s ease;
    display: flex;
    flex-direction: column;
    height: 100%;
}
.blog-card:hover {
    box-shadow: var(--blog-shadow-hover);
    transform: translateY(-3px);
}
.blog-card__image-link {
    display: block;
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: #f0f0f0;
}
.blog-card__image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}
.blog-card__image.object-contain {
    object-fit: contain;
    background: #fff;
    padding: 10px;
}
.blog-card:hover .blog-card__image {
    transform: scale(1.03);
}
.blog-card__content {
    display: flex;
    flex-direction: column;
    flex: 1;
    padding: 30px;
}
.blog-card-category {
    font-size: 0.75rem;
    color: #666;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 15px;
}
.blog-card-title {
    font-size: 1.4rem;
    color: var(--blog-heading);
    margin-bottom: 15px;
    font-weight: 700;
    line-height: 1.35;
}
.blog-card-title a {
    color: inherit;
    text-decoration: none;
}
.blog-card-title a:hover {
    color: var(--cta-primary);
}
.blog-card-summary {
    font-size: 1rem;
    color: #555;
    margin-bottom: 25px;
    flex-grow: 1;
    line-height: 1.6;
}
.blog-card-link {
    color: var(--cta-primary);
    font-weight: 600;
    text-decoration: none;
    align-self: flex-start;
    font-size: 0.95rem;
}
.blog-card-link:hover {
    text-decoration: underline;
}

/* ====================================================
   ARTICLE LAYOUT
==================================================== */
.article-container {
    max-width: 760px;
    margin: 60px auto 100px;
    padding: 0 20px;
}
.breadcrumb {
    font-size: 0.85rem;
    color: #777;
    margin-bottom: 40px;
}
.breadcrumb a {
    color: #333;
    text-decoration: none;
}
.breadcrumb a:hover {
    text-decoration: underline;
}
.breadcrumb span {
    margin: 0 10px;
    color: #ccc;
}
.article-header {
    margin-bottom: 30px;
    border-bottom: none;
    padding-bottom: 10px;
}
.article-hero-image {
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    border-radius: var(--blog-radius);
    margin-bottom: 40px;
    border: 1px solid var(--blog-border);
}
.article-hero-image.object-contain {
    object-fit: contain;
    background: #fff;
    padding: 20px;
}
.article-category {
    font-size: 0.8rem;
    color: #555;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 20px;
    display: inline-block;
}
.article-title {
    font-size: clamp(2.2rem, 5vw, 2.8rem);
    color: var(--blog-heading);
    font-weight: 800;
    line-height: 1.25;
    margin-bottom: 20px;
    letter-spacing: -0.5px;
}
.article-intro {
    font-size: 1.25rem;
    color: #444;
    line-height: 1.7;
    font-weight: 400;
}
.article-content a {
    color: var(--cta-primary);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
}
.article-content a:hover {
    color: var(--cta-primary-hover);
}
.article-content h2 {
    font-size: 1.8rem;
    color: var(--blog-heading);
    margin: 60px 0 25px;
    font-weight: 700;
    line-height: 1.3;
}
.article-content h3 {
    font-size: 1.4rem;
    color: var(--blog-heading);
    margin: 40px 0 20px;
    font-weight: 700;
}
.article-content p {
    margin-bottom: 25px;
}
.article-content ul, .article-content ol {
    margin-bottom: 30px;
    padding-left: 25px;
}
.article-content li {
    margin-bottom: 12px;
}

/* ====================================================
   TABLE OF CONTENTS (SOMMAIRE)
==================================================== */
.toc {
    background: #F8F9FA;
    border: none;
    border-left: 4px solid #E2E6EA;
    padding: 30px;
    margin: 50px 0;
}
.toc-title {
    font-size: 1.1rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 20px;
    color: var(--blog-heading);
}
.toc-list {
    list-style: none;
    padding: 0;
    margin: 0;
}
.toc-list li {
    margin-bottom: 12px;
}
.toc-list a {
    color: #444;
    text-decoration: none;
    font-weight: 500;
}
.toc-list a:hover {
    color: var(--cta-primary);
    text-decoration: underline;
}

/* ====================================================
   VISUAL BLOCKS (Monochrome & Elegant)
==================================================== */
.block {
    padding: 25px 30px;
    margin: 40px 0;
    background: #FAFAFA;
    border-left: 3px solid #1F1F1F;
}
.block-title {
    font-weight: 700;
    margin-bottom: 12px;
    font-size: 1.1rem;
    color: #1F1F1F;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.block p:last-child {
    margin-bottom: 0;
}

/* ====================================================
   TABLES
==================================================== */
.table-responsive {
    overflow-x: auto;
    margin: 40px 0;
}
.table-responsive table {
    width: 100%;
    border-collapse: collapse;
}
.table-responsive th, .table-responsive td {
    padding: 16px 20px;
    border-bottom: 1px solid var(--blog-border);
    text-align: left;
}
.table-responsive th {
    background: #fff;
    font-weight: 700;
    color: var(--blog-heading);
    border-bottom: 2px solid var(--blog-heading);
}

/* ====================================================
   CTA COURSERA PLUS (Colored & Prominent)
==================================================== */
.article-cta {
    background: #F7F9FA;
    border: 1px solid var(--blog-border);
    padding: 50px 40px;
    border-radius: var(--blog-radius);
    text-align: center;
    margin: 70px 0;
}
.article-cta h3 {
    font-size: 1.6rem;
    margin-bottom: 15px;
    color: var(--blog-heading);
    font-weight: 700;
}
.article-cta p {
    font-size: 1.1rem;
    margin-bottom: 25px;
    color: #555;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}
.article-cta .cta-price {
    font-size: 2rem;
    font-weight: 800;
    color: #1F1F1F;
    display: block;
    margin-bottom: 30px;
}
.article-cta .btn-group {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}
.article-cta .btn-primary {
    background: var(--cta-primary);
    color: #fff;
    padding: 14px 28px;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 600;
    transition: background 0.2s ease;
}
.article-cta .btn-primary:hover {
    background: var(--cta-primary-hover);
}
.article-cta .btn-whatsapp {
    background: var(--cta-whatsapp);
    color: #fff;
    padding: 14px 28px;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 600;
    transition: background 0.2s ease;
}
.article-cta .btn-whatsapp:hover {
    background: #20b858;
}

/* ====================================================
   RELATED ARTICLES
==================================================== */
.related-articles {
    border-top: 1px solid var(--blog-border);
    padding-top: 50px;
    margin-top: 50px;
}
.related-articles h3 {
    font-size: 1.4rem;
    color: var(--blog-heading);
    margin-bottom: 25px;
    font-weight: 700;
}
.related-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 15px;
}
.related-list a {
    color: var(--cta-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
}
.related-list a:hover {
    text-decoration: underline;
}

/* ====================================================
   RESPONSIVE
==================================================== */
@media (max-width: 768px) {
    body { font-size: 16px; }
    .blog-hero { padding: 50px 15px; }
    .blog-hero h1 { font-size: 2rem; }
    .article-container { margin: 40px auto 60px; }
    .article-title { font-size: 1.8rem; }
    .article-cta { padding: 40px 20px; }
    .article-cta .btn-group { flex-direction: column; }
    .article-cta .btn-group a { width: 100%; }
}