.article-header {
    background: #ffffff;
    padding: 12px 7%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.06);
    position: sticky;
    top: 0;
    z-index: 100;
}

.article-header img {
    width: 160px;
    height: 55px;
    object-fit: contain;
}

.article-nav {
    display: flex;
    align-items: center;
    gap: 25px;
    flex-wrap: wrap;
}

.article-nav a {
    color: #26384d;
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
}

.article-nav a:hover {
    color: #0878c9;
}

.article-hero {
    background: linear-gradient(120deg, #eef7ff, #ffffff);
    padding: 65px 8%;
    text-align: center;
}

.article-hero .category {
    color: #0878c9;
    font-weight: bold;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.article-hero h1 {
    max-width: 950px;
    margin: 18px auto;
    color: #173b61;
    font-size: 38px;
    line-height: 1.3;
}

.article-meta {
    color: #718096;
    font-size: 14px;
}

.article-cover {
    width: 100%;
    max-width: 1050px;
    height: 350px;
    object-fit: cover;
    display: block;
    margin: 35px auto 0;
    border-radius: 12px;
}

.article-layout {
    max-width: 1050px;
    margin: 55px auto;
    padding: 0 25px;
    display: grid;
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: 45px;
}

.article-body {
    color: #43546a;
    font-size: 16px;
    line-height: 1.85;
}

.article-body h2 {
    color: #173b61;
    font-size: 25px;
    margin: 35px 0 12px;
}

.article-body h3 {
    color: #0878c9;
    font-size: 19px;
    margin: 24px 0 8px;
}

.article-body p {
    margin-bottom: 18px;
}

.article-body ul {
    padding-left: 25px;
    margin-bottom: 20px;
}

.article-body li {
    margin-bottom: 9px;
}

.article-highlight {
    background: #eef7ff;
    border-left: 4px solid #0878c9;
    padding: 20px;
    margin: 25px 0;
    border-radius: 5px;
}

.article-sidebar {
    background: #f6f9fc;
    padding: 25px;
    border-radius: 10px;
    height: fit-content;
}

.article-sidebar h3 {
    color: #173b61;
    margin-bottom: 15px;
}

.article-sidebar a {
    display: block;
    color: #0878c9;
    text-decoration: none;
    margin-bottom: 14px;
    line-height: 1.5;
}

.article-sidebar a:hover {
    text-decoration: underline;
}

.article-cta {
    background: #eef7ff;
    padding: 35px;
    text-align: center;
    border-radius: 10px;
    margin: 40px 0;
}

.article-cta h2 {
    margin-top: 0;
}

.article-cta a {
    display: inline-block;
    background: #0878c9;
    color: white;
    padding: 12px 25px;
    border-radius: 5px;
    text-decoration: none;
    margin-top: 12px;
}

.article-footer {
    background: #173b61;
    color: white;
    padding: 25px;
    text-align: center;
    font-size: 14px;
}

.back-link {
    display: inline-block;
    color: #0878c9;
    text-decoration: none;
    margin-top: 25px;
    font-weight: bold;
}

@media (max-width: 768px) {
    .article-header {
        flex-direction: column;
    }

    .article-nav {
        justify-content: center;
        gap: 14px;
    }

    .article-hero {
        padding: 45px 6%;
    }

    .article-hero h1 {
        font-size: 28px;
    }

    .article-cover {
        height: 220px;
    }

    .article-layout {
        grid-template-columns: 1fr;
        margin: 30px auto;
    }

    .article-sidebar {
        order: 2;
    }
}