/* ===== ARTICLE LAYOUT — modern landing-page style ===== */
.dhf-article-hero {
    position: relative; overflow: hidden;
    background: linear-gradient(135deg, #0a2540 0%, #0d3a6b 50%, #0061af 100%);
    color: #fff; padding: 60px 0 80px;
}
.dhf-article-hero::before {
    content: ""; position: absolute; inset: 0;
    background: var(--dhf-article-hero-bg, linear-gradient(135deg, rgba(10,37,64,0.7), rgba(0,97,175,0.7)));
    background-size: cover; background-position: center;
    opacity: 0.6;
}
.dhf-article-hero::after {
    content: ""; position: absolute; inset: 0;
    background: linear-gradient(180deg, rgba(10,37,64,0.35) 0%, rgba(10,37,64,0.85) 100%);
}
.dhf-article-hero-inner { position: relative; z-index: 2; }
.dhf-article-eyebrow {
    display: inline-block; padding: 6px 14px; border-radius: 999px;
    background: rgba(255,255,255,0.12); backdrop-filter: blur(6px);
    color: #cfe6ff; font-size: 0.8rem; font-weight: 600;
    letter-spacing: 1px; text-transform: uppercase;
}
.dhf-article-title {
    font-size: 2.4rem; font-weight: 800; line-height: 1.25;
    margin: 12px 0 16px;
    text-shadow: 0 4px 20px rgba(0,0,0,0.45);
}
.dhf-article-meta {
    display: flex; gap: 18px; flex-wrap: wrap; align-items: center;
    color: #cfe6ff; font-size: 0.95rem;
}
.dhf-article-meta i { margin-right: 6px; color: #7be8ff; }
.dhf-article-breadcrumb {
    background: transparent; padding: 0; margin: 0 0 8px;
}
.dhf-article-breadcrumb a, .dhf-article-breadcrumb span {
    color: #cfe6ff; text-decoration: none; font-size: 0.9rem;
}
.dhf-article-breadcrumb a:hover { color: #7be8ff; text-decoration: underline; }
.dhf-article-breadcrumb .sep { margin: 0 8px; opacity: 0.6; }

/* Content card */
.dhf-article-shell { margin-top: -48px; position: relative; z-index: 3; }
.dhf-article-card {
    background: #fff; border-radius: 20px; padding: 36px 40px;
    box-shadow: 0 24px 60px rgba(10, 37, 64, 0.14);
}
.dhf-article-card .detail-content {
    font-size: 1.05rem; line-height: 1.85; color: #1f2937;
}
.dhf-article-card .detail-content img { max-width: 100%; height: auto; border-radius: 10px; margin: 16px 0; }
.dhf-article-card .detail-content h2, .dhf-article-card .detail-content h3 { color: #0a2540; margin-top: 1.4em; }
.dhf-article-card .detail-content blockquote {
    border-left: 4px solid #0061af; padding: 10px 20px; margin: 18px 0;
    background: rgba(0,97,175,0.04); border-radius: 0 12px 12px 0;
    font-style: italic; color: #334155;
}
.dhf-article-card .detail-content p { margin-bottom: 1.1em; }
.dhf-article-card .detail-content a { color: #0061af; }

/* Sidebar */
.dhf-article-sidebar { position: sticky; top: 90px; }
.dhf-article-sidebar-card {
    background: #fff; border-radius: 18px; padding: 22px;
    box-shadow: 0 8px 24px rgba(10, 37, 64, 0.08);
    margin-bottom: 20px;
}
.dhf-article-sidebar-title {
    font-weight: 800; color: #0a2540; font-size: 1rem;
    margin-bottom: 14px; padding-bottom: 10px;
    border-bottom: 2px solid rgba(0, 97, 175, 0.1);
}
.dhf-article-search .input-group .form-select,
.dhf-article-search .input-group .form-control {
    border-color: rgba(0,97,175,0.18);
}
.dhf-article-search .btn { background: #0061af; border: none; }

/* Floating tools (font size, share) */
.dhf-article-tools {
    position: sticky; top: 90px;
    display: flex; flex-direction: column; gap: 6px;
    background: #fff; padding: 10px 8px; border-radius: 999px;
    box-shadow: 0 8px 24px rgba(10, 37, 64, 0.1);
    width: 44px; align-items: center;
    margin-bottom: 20px;
}
.dhf-article-tools .tool-btn {
    width: 32px; height: 32px; border-radius: 50%;
    display: inline-flex; align-items: center; justify-content: center;
    background: rgba(0,97,175,0.08); color: #0061af;
    border: none; cursor: pointer; transition: background .2s ease, transform .15s ease;
    text-decoration: none; font-size: 0.85rem;
}
.dhf-article-tools .tool-btn:hover { background: #0061af; color: #fff; transform: translateY(-1px); }
.dhf-article-tools .tool-btn.active { background: #0061af; color: #fff; }

/* "Cùng chuyên mục" related grid section */
.dhf-related-section {
    background: linear-gradient(180deg, #f8fbff 0%, #eef5fc 100%);
    padding: 60px 0; margin-top: 60px;
}

@media (max-width: 991.98px) {
    .dhf-article-card { padding: 24px 22px; border-radius: 14px; }
    .dhf-article-title { font-size: 1.6rem; }
    .dhf-article-shell { margin-top: -32px; }
    .dhf-article-hero { padding: 40px 0 56px; }
    .dhf-article-sidebar, .dhf-article-tools { position: static; }
    .dhf-article-tools { flex-direction: row; width: auto; border-radius: 999px; }
}