```css
/* =========================================================
   PAGE ARTICLE - ONPA
   ========================================================= */

.article-page {
    width: 100%;
    min-height: 100vh;
    background: #f6f8fb;
    padding: 50px 0 80px;
    box-sizing: border-box;
}

.article-page .container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    box-sizing: border-box;
}

/* =========================================================
   EN-TÊTE DE L'ARTICLE
   ========================================================= */

.article-header {
    width: 100%;
    max-width: 900px;
    margin: 0 auto 30px;
}

.article-category {
    display: inline-block;
    margin-bottom: 12px;
    color: #075bd3;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 1.2px;
    text-transform: uppercase;
}

.article-header h1 {
    margin: 0 0 18px;
    color: #002b67;
    font-size: 32px !important;
    font-weight: 700;
    line-height: 1.35;
}

/* =========================================================
   MÉTADONNÉES
   ========================================================= */

.article-meta {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 22px;
    color: #718096;
    font-size: 13px;
}

.article-meta span {
    display: inline-flex;
    align-items: center;
    gap: 7px;
}

.article-meta i {
    color: #075bd3;
    font-size: 14px;
}

/* =========================================================
   LAYOUT PRINCIPAL
   ========================================================= */

.article-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 330px;
    align-items: start;
    gap: 35px;
}

/* =========================================================
   ARTICLE PRINCIPAL
   ========================================================= */

.article-content {
    min-width: 0;
    overflow: hidden;
    background: #ffffff;
    border: 1px solid #e2e7ee;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0, 43, 103, 0.06);
}

/* =========================================================
   IMAGE PRINCIPALE
   ========================================================= */

.article-image {
    width: 100%;
    height: 430px;
    overflow: hidden;
    background: #edf1f5;
}

.article-image img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.article-content:hover .article-image img {
    transform: scale(1.02);
}

/* =========================================================
   CORPS DE L'ARTICLE
   ========================================================= */

.article-body {
    padding: 32px 35px 35px;
}

.article-body > p {
    margin: 0 0 20px;
    color: #455568;
    font-size: 16px;
    line-height: 1.9;
}

/* Paragraphes ajoutés éventuellement dans le contenu */

.article-body p {
    color: #455568;
    font-size: 16px;
    line-height: 1.9;
}

.article-body strong {
    color: #002b67;
}

.article-body a {
    color: #075bd3;
    text-decoration: underline;
}

.article-body img {
    max-width: 100%;
    height: auto;
}

/* =========================================================
   PARTAGE
   ========================================================= */

.article-share {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    margin-top: 35px;
    padding-top: 25px;
    border-top: 1px solid #e3e8ee;
}

.article-share > span {
    color: #002b67;
    font-size: 14px;
    font-weight: 700;
}

.share-buttons {
    display: flex;
    align-items: center;
    gap: 8px;
}

.share-buttons button {
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;

    border: 1px solid #dce3eb;
    border-radius: 50%;

    background: #ffffff;
    color: #075bd3;

    font-size: 15px;
    cursor: pointer;

    transition:
        color 0.25s ease,
        background 0.25s ease,
        border-color 0.25s ease,
        transform 0.25s ease;
}

.share-buttons button:hover {
    color: #ffffff;
    background: #075bd3;
    border-color: #075bd3;
    transform: translateY(-2px);
}

/* =========================================================
   SIDEBAR
   ========================================================= */

.article-sidebar {
    width: 100%;
}

.sidebar-box {
    padding: 24px;
    background: #ffffff;
    border: 1px solid #e2e7ee;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0, 43, 103, 0.06);
}

.sidebar-box h3 {
    position: relative;
    margin: 0 0 22px;
    padding-bottom: 12px;

    color: #002b67;
    font-size: 19px;
    font-weight: 700;
}

.sidebar-box h3::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;

    width: 45px;
    height: 3px;

    border-radius: 3px;
    background: #ffd21c;
}

/* =========================================================
   ACTUALITÉ RÉCENTE
   ========================================================= */

.recent-news {
    display: flex;
    align-items: flex-start;
    gap: 13px;

    padding: 15px 0;

    border-bottom: 1px solid #e8edf2;

    text-decoration: none;

    transition: background 0.2s ease;
}

.recent-news:first-of-type {
    padding-top: 0;
}

.recent-news:last-of-type {
    border-bottom: none;
    padding-bottom: 0;
}

.recent-news img {
    flex: 0 0 82px;

    width: 82px;
    height: 65px;

    object-fit: cover;

    border-radius: 6px;
    background: #edf1f5;
}

.recent-news div {
    min-width: 0;
}

.recent-news h4 {
    margin: 0 0 7px;

    color: #002b67;
    font-size: 13px;
    font-weight: 700;
    line-height: 1.45;

    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 3;
    overflow: hidden;

    transition: color 0.2s ease;
}

.recent-news span {
    display: block;

    color: #8491a0;
    font-size: 11px;
}

.recent-news:hover h4 {
    color: #075bd3;
}

/* =========================================================
   BOUTON RETOUR
   ========================================================= */

.back-button {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 9px;

    width: 100%;
    margin-top: 18px;
    padding: 13px 16px;

    box-sizing: border-box;

    border: 1px solid #075bd3;
    border-radius: 7px;

    background: #075bd3;
    color: #ffffff;

    font-size: 13px;
    font-weight: 600;
    text-decoration: none;

    transition:
        background 0.25s ease,
        border-color 0.25s ease,
        transform 0.25s ease;
}

.back-button:hover {
    background: #002b67;
    border-color: #002b67;
    transform: translateY(-2px);
}

/* =========================================================
   TABLETTE
   ========================================================= */

@media (max-width: 950px) {

    .article-page {
        padding-top: 40px;
    }

    .article-layout {
        grid-template-columns: minmax(0, 1fr) 280px;
        gap: 25px;
    }

    .article-image {
        height: 360px;
    }

    .article-body {
        padding: 28px;
    }

    .article-header h1 {
        font-size: 27px !important;
    }

}

/* =========================================================
   MOBILE
   ========================================================= */

@media (max-width: 750px) {

    .article-page {
        padding: 30px 0 50px;
    }

    .article-page .container {
        padding: 0 14px;
    }

    .article-header {
        margin-bottom: 22px;
    }

    .article-header h1 {
        font-size: 24px !important;
        line-height: 1.4;
    }

    .article-meta {
        gap: 12px;
    }

    .article-layout {
        grid-template-columns: 1fr;
        gap: 25px;
    }

    .article-image {
        height: 300px;
    }

    .article-body {
        padding: 24px 20px;
    }

    .article-body p {
        font-size: 15px;
        line-height: 1.8;
    }

    .article-share {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }

    .article-sidebar {
        order: 2;
    }

}

/* =========================================================
   PETIT MOBILE
   ========================================================= */

@media (max-width: 450px) {

    .article-page .container {
        padding: 0 10px;
    }

    .article-category {
        font-size: 11px;
    }

    .article-header h1 {
        font-size: 21px !important;
    }

    .article-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .article-image {
        height: 230px;
    }

    .article-body {
        padding: 20px 16px;
    }

    .article-body p {
        font-size: 14px;
    }

    .sidebar-box {
        padding: 20px 16px;
    }

    .recent-news img {
        width: 75px;
        height: 60px;
        flex-basis: 75px;
    }

    .article-share {
        margin-top: 28px;
        padding-top: 20px;
    }

}
```