/* ============================================================
   Статьи и База знаний — стили раздела articles
   Дизайн-токены сайта «Техресурс» (трубы23.рф)
   ============================================================ */

.articles-wrap {
    max-width: 1400px;
    margin: 0 auto;
    padding: 40px 48px 80px;
}

/* ---------- Хлебные крошки ---------- */
.page-nav {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 28px;
}
.page-nav a { color: var(--text-muted); text-decoration: none; transition: var(--transition-fast); }
.page-nav a:hover { color: var(--accent); }
.page-nav .pn-sep { color: rgba(90, 111, 133, 0.4); }
.page-nav .pn-current { color: var(--text-secondary); font-weight: 600; }

/* ---------- Шапка статьи / хаба ---------- */
.art-kicker {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--primary-glow);
    border: 1px solid rgba(0, 85, 212, 0.12);
    padding: 7px 18px;
    border-radius: 50px;
    font-size: 12px;
    font-weight: 600;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 18px;
}
.art-kicker i { font-size: 13px; }

.art-title {
    font-size: 38px;
    line-height: 1.2;
    color: var(--text-white);
    margin-bottom: 16px;
}
.art-title .highlight { color: var(--primary); }

.art-lead {
    font-size: 17px;
    line-height: 1.75;
    color: var(--text-secondary);
    margin-bottom: 18px;
}

.art-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
    font-size: 13px;
    color: var(--text-muted);
    padding: 14px 0;
    border-top: 1px solid rgba(0, 85, 212, 0.08);
    border-bottom: 1px solid rgba(0, 85, 212, 0.08);
    margin-bottom: 28px;
}
.art-meta span { display: inline-flex; align-items: center; gap: 7px; }
.art-meta i { color: var(--accent); font-size: 13px; }

/* ---------- Главное изображение ---------- */
.art-featured {
    max-width: 920px;
    margin: 0 auto 36px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    position: relative;
}
.art-featured img { width: 100%; height: auto; display: block; }
.art-featured figcaption {
    font-size: 12px;
    color: var(--text-muted);
    padding: 10px 4px 0;
}

/* ---------- Оглавление ---------- */
.toc {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 20px 24px;
    margin-bottom: 40px;
}
.toc-title {
    font-family: 'Space Grotesk', 'Inter', sans-serif;
    font-size: 15px;
    font-weight: 700;
    color: var(--text-white);
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}
.toc-title i { color: var(--orange); font-size: 14px; }
.toc ol { list-style: none; counter-reset: toc; padding: 0; }
.toc li { counter-increment: toc; margin-bottom: 8px; }
.toc li::before {
    content: counter(toc);
    display: inline-block;
    width: 22px;
    height: 22px;
    line-height: 22px;
    text-align: center;
    border-radius: 6px;
    background: var(--primary-glow);
    color: var(--accent);
    font-size: 11px;
    font-weight: 700;
    margin-right: 10px;
}
.toc a { color: var(--text-secondary); text-decoration: none; font-size: 14px; transition: var(--transition-fast); }
.toc a:hover { color: var(--accent); }

/* ---------- Текст статьи ---------- */
.art-body { font-size: 16px; line-height: 1.75; color: var(--text-primary); }
.art-body p { margin-bottom: 18px; }
.art-body h2 {
    font-size: 26px;
    color: var(--text-white);
    margin: 44px 0 16px;
    padding-bottom: 10px;
    border-bottom: 2px solid rgba(0, 85, 212, 0.1);
    scroll-margin-top: 100px;
}
.art-body h3 {
    font-size: 19px;
    color: var(--primary);
    margin: 28px 0 12px;
    scroll-margin-top: 100px;
}
.art-body ul, .art-body ol { margin: 0 0 18px 22px; }
.art-body li { margin-bottom: 8px; }
.art-body li::marker { color: var(--accent); font-weight: 600; }
.art-body a { color: var(--accent); font-weight: 500; text-decoration: none; border-bottom: 1px solid rgba(46, 97, 184, 0.35); }
.art-body a:hover { color: var(--orange); border-bottom-color: var(--orange); }
.art-body strong { color: var(--text-white); }

.art-body table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-card);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    font-size: 14px;
    margin: 20px 0 26px;
}
.art-body th {
    background: var(--bg-surface);
    color: var(--text-white);
    font-weight: 700;
    text-align: left;
    padding: 12px 14px;
    border-bottom: 2px solid rgba(0, 85, 212, 0.12);
}
.art-body td {
    padding: 11px 14px;
    border-bottom: 1px solid rgba(0, 85, 212, 0.06);
    color: var(--text-secondary);
    vertical-align: top;
}
.art-body tr:last-child td { border-bottom: none; }
.art-body tr:nth-child(even) td { background: #F8FBFE; }

/* Цитата-вывод */
.art-quote {
    background: linear-gradient(135deg, rgba(0, 35, 90, 0.04), rgba(46, 97, 184, 0.05));
    border-left: 4px solid var(--accent);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    padding: 18px 22px;
    margin: 24px 0;
    font-size: 15px;
    color: var(--text-secondary);
}
.art-quote strong { color: var(--primary); }

/* Врезка-совет */
.art-tip {
    background: rgba(255, 94, 14, 0.05);
    border: 1px solid rgba(255, 94, 14, 0.18);
    border-radius: var(--radius-md);
    padding: 16px 20px;
    margin: 24px 0;
    font-size: 14.5px;
    color: var(--text-secondary);
    display: flex;
    gap: 14px;
    align-items: flex-start;
}
.art-tip i { color: var(--orange); font-size: 18px; margin-top: 3px; flex-shrink: 0; }

/* ---------- CTA ---------- */
.art-cta {
    background: var(--gradient-hero);
    border-radius: var(--radius-lg);
    padding: 36px 34px;
    color: #fff;
    margin: 48px 0;
    position: relative;
    overflow: hidden;
}
.art-cta::after {
    content: '';
    position: absolute;
    right: -60px;
    top: -60px;
    width: 220px;
    height: 220px;
    background: radial-gradient(circle, rgba(255, 94, 14, 0.25), transparent 70%);
}
.art-cta h3 {
    font-size: 22px;
    margin-bottom: 10px;
    color: #fff;
}
.art-cta p {
    font-size: 14.5px;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 22px;
    max-width: 620px;
}
.art-cta-buttons { display: flex; flex-wrap: wrap; gap: 14px; position: relative; z-index: 1; }
.art-cta-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: var(--transition);
}
.art-cta-btn.primary { background: var(--gradient-orange); color: #fff; box-shadow: 0 8px 24px rgba(255, 94, 14, 0.35); }
.art-cta-btn.primary:hover { transform: translateY(-3px); box-shadow: 0 12px 34px rgba(255, 94, 14, 0.45); }
.art-cta-btn.ghost { background: rgba(255, 255, 255, 0.12); color: #fff; border: 2px solid rgba(255, 255, 255, 0.4); }
.art-cta-btn.ghost:hover { background: rgba(255, 255, 255, 0.2); border-color: #fff; }

/* ---------- FAQ ---------- */
.faq { margin: 44px 0 0; }
.faq-title {
    font-size: 24px;
    color: var(--text-white);
    margin-bottom: 18px;
    display: flex;
    align-items: center;
    gap: 12px;
}
.faq-title i { color: var(--accent); }
.faq details {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    margin-bottom: 12px;
    overflow: hidden;
    transition: var(--transition);
}
.faq details[open] { border-color: rgba(0, 85, 212, 0.25); box-shadow: var(--shadow-sm); }
.faq summary {
    list-style: none;
    cursor: pointer;
    padding: 16px 20px;
    font-weight: 600;
    font-size: 15px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    transition: var(--transition-fast);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary:hover { color: var(--accent); }
.faq summary .faq-chevron { color: var(--accent); font-size: 13px; transition: transform 0.3s ease; flex-shrink: 0; }
.faq details[open] summary .faq-chevron { transform: rotate(180deg); }
.faq .faq-a {
    padding: 0 20px 18px 20px;
    font-size: 14.5px;
    line-height: 1.7;
    color: var(--text-secondary);
}

/* ---------- Дисклеймер ---------- */
.art-disclaimer {
    background: var(--bg-surface);
    border-radius: var(--radius-md);
    padding: 16px 20px;
    font-size: 12.5px;
    line-height: 1.65;
    color: var(--text-muted);
    margin-top: 40px;
    display: flex;
    gap: 12px;
}
.art-disclaimer i { color: var(--text-muted); font-size: 15px; margin-top: 2px; flex-shrink: 0; }

/* ---------- Читайте также ---------- */
.read-also { margin-top: 52px; }
.read-also-title {
    font-size: 22px;
    color: var(--text-white);
    margin-bottom: 18px;
    display: flex;
    align-items: center;
    gap: 12px;
}
.read-also-title i { color: var(--orange); }
.read-also-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.ra-card {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    text-decoration: none;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}
.ra-card:hover {
    transform: translateY(-6px);
    border-color: rgba(255, 94, 14, 0.3);
    box-shadow: 0 14px 40px rgba(255, 94, 14, 0.12), var(--shadow-md);
}
.ra-card-img { height: 140px; overflow: hidden; background: var(--bg-surface); position: relative; }
.ra-card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s ease; }
.ra-card:hover .ra-card-img img { transform: scale(1.06); }
.ra-card-img .ra-tag {
    position: absolute;
    top: 12px;
    left: 12px;
    background: var(--gradient-orange);
    color: #fff;
    padding: 4px 12px;
    border-radius: 50px;
    font-size: 10.5px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.ra-card-body { padding: 18px 18px 20px; display: flex; flex-direction: column; flex: 1; }
.ra-card-body h4 { font-size: 15px; color: var(--text-white); line-height: 1.4; margin-bottom: 8px; }
.ra-card-body p { font-size: 13px; color: var(--text-muted); line-height: 1.6; margin-bottom: 12px; flex: 1; }
.ra-card-body .ra-link {
    font-size: 12px;
    font-weight: 700;
    color: var(--orange);
    text-transform: uppercase;
    letter-spacing: 1px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.ra-card-body .ra-link i { font-size: 11px; transition: transform 0.3s ease; }
.ra-card:hover .ra-card-body .ra-link i { transform: translateX(5px); }

/* ---------- Навигация предыдущая / следующая ---------- */
.art-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-top: 48px;
}
.art-nav a {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 18px 22px;
    text-decoration: none;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.art-nav a:hover { border-color: var(--accent); transform: translateY(-3px); }
.art-nav .an-label {
    font-size: 11px;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1.2px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.art-nav .an-label.next { justify-content: flex-end; }
.art-nav .an-title { font-size: 15px; font-weight: 600; color: var(--primary); line-height: 1.4; }

/* ============================================================
   ХАБ — стартовая страница раздела статей
   ============================================================ */
.hub-header {
    text-align: center;
    max-width: 780px;
    margin: 0 auto 48px;
}
.hub-header .section-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--primary-glow);
    border: 1px solid rgba(0, 85, 212, 0.12);
    padding: 8px 20px;
    border-radius: 50px;
    margin-bottom: 20px;
    font-size: 12px;
    font-weight: 600;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 2px;
}
.hub-header .section-badge i { color: var(--accent); }
.hub-title {
    font-size: 40px;
    color: var(--text-white);
    margin-bottom: 14px;
    line-height: 1.15;
}
.hub-title .highlight {
    background: var(--gradient-orange);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hub-lead {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.8;
}

.hub-filter {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 40px;
}
.hub-filter button {
    padding: 10px 22px;
    border-radius: 50px;
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: 'Inter', sans-serif;
}
.hub-filter button:hover, .hub-filter button.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
    box-shadow: 0 4px 16px rgba(0, 35, 90, 0.2);
}

.hub-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 56px;
}
.hub-card {
    background: var(--bg-card);
    border: 1px solid rgba(0, 85, 212, 0.08);
    border-radius: var(--radius-lg);
    overflow: hidden;
    text-decoration: none;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    position: relative;
}
.hub-card::after {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 4px;
    background: var(--gradient-orange);
    transform: scaleX(0);
    transition: transform 0.4s ease;
    transform-origin: left;
}
.hub-card:hover::after { transform: scaleX(1); }
.hub-card:hover {
    transform: translateY(-10px);
    border-color: rgba(255, 94, 14, 0.25);
    box-shadow: 0 20px 60px rgba(255, 94, 14, 0.13), 0 8px 32px rgba(0, 35, 90, 0.14);
}
.hub-card-img { height: 190px; overflow: hidden; background: var(--bg-surface); position: relative; }
.hub-card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s ease; }
.hub-card:hover .hub-card-img img { transform: scale(1.05); }
.hub-card-img .hc-tag {
    position: absolute;
    top: 14px;
    left: 14px;
    background: var(--gradient-orange);
    color: #fff;
    padding: 5px 14px;
    border-radius: 50px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.hub-card-body { padding: 24px; display: flex; flex-direction: column; flex: 1; }
.hub-card-body h3 { font-size: 17px; color: var(--text-white); line-height: 1.4; margin-bottom: 10px; }
.hub-card-body p { font-size: 13.5px; color: var(--text-secondary); line-height: 1.65; margin-bottom: 16px; flex: 1; }
.hub-card-foot {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
    color: var(--text-muted);
}
.hub-card-foot .hc-read {
    color: var(--orange);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 11.5px;
}
.hub-card-foot .hc-read i { font-size: 10px; transition: transform 0.3s ease; }
.hub-card:hover .hc-read i { transform: translateX(5px); }

/* Пустое состояние хаба */
.hub-empty {
    grid-column: 1 / -1;
    text-align: center;
    padding: 60px 24px;
    background: var(--bg-card);
    border: 2px dashed rgba(0, 85, 212, 0.18);
    border-radius: var(--radius-lg);
    color: var(--text-muted);
}
.hub-empty i { font-size: 40px; color: rgba(46, 97, 184, 0.4); margin-bottom: 18px; }
.hub-empty h3 { color: var(--text-secondary); font-size: 20px; margin-bottom: 10px; }
.hub-empty p { font-size: 14.5px; max-width: 560px; margin: 0 auto; line-height: 1.7; }

/* ---------- Пагинация хаба ---------- */
.hub-pager {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 14px;
    flex-wrap: wrap;
    margin: 0 0 56px;
}
.hub-pager .hp-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 50px;
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
}
.hub-pager .hp-btn:hover { border-color: var(--accent); color: var(--accent); }
.hub-pager .hp-btn.disabled { opacity: 0.4; pointer-events: none; }
.hub-pager .hp-pages { display: flex; gap: 6px; flex-wrap: wrap; }
.hub-pager .hp-num {
    min-width: 38px;
    height: 38px;
    padding: 0 8px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
}
.hub-pager .hp-num:hover { border-color: var(--accent); color: var(--accent); }
.hub-pager .hp-num.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

/* CTA «Не нашли ответ?» */
.hub-cta {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-left: 5px solid var(--orange);
    border-radius: var(--radius-lg);
    padding: 32px 34px;
    display: flex;
    align-items: center;
    gap: 28px;
    flex-wrap: wrap;
    box-shadow: var(--shadow-sm);
}
.hub-cta-text { flex: 1; min-width: 260px; }
.hub-cta-text h3 { font-size: 20px; color: var(--text-white); margin-bottom: 8px; }
.hub-cta-text p { font-size: 14px; color: var(--text-secondary); }
.hub-cta-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.hub-cta-actions .art-cta-btn { padding: 12px 24px; }
.hub-cta-actions .art-cta-btn.solid {
    background: var(--primary);
    color: #fff;
}
.hub-cta-actions .art-cta-btn.solid:hover { background: var(--primary-light); transform: translateY(-3px); }

/* ---------- Адаптив ---------- */
@media (max-width: 1200px) {
    .hub-grid { grid-template-columns: repeat(3, 1fr); }
    .read-also-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 992px) {
    .hub-grid { grid-template-columns: repeat(2, 1fr); }
    .read-also-grid { grid-template-columns: repeat(2, 1fr); }
    .art-title { font-size: 32px; }
    .hub-title { font-size: 34px; }
}
@media (max-width: 768px) {
    .articles-wrap { padding: 28px 16px 64px; }
    .hub-grid { grid-template-columns: 1fr; }
    .read-also-grid { grid-template-columns: 1fr; }
    .art-nav { grid-template-columns: 1fr; }
    .art-title { font-size: 27px; }
    .hub-title { font-size: 28px; }
    .art-body { font-size: 15.5px; }
    .art-body h2 { font-size: 22px; }
    .art-cta { padding: 28px 22px; }
    .art-cta-buttons .art-cta-btn { width: 100%; justify-content: center; }
    .hub-cta { padding: 24px 20px; }
    .art-body table { display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; }
    .toc { padding: 16px 18px; }
}
@media (max-width: 480px) {
    .art-title { font-size: 24px; }
    .art-meta { gap: 12px; font-size: 12px; }
    .toc { padding: 16px 18px; }
}

/* ---------- Появление карточек (IntersectionObserver) ---------- */
.hub-card, .ra-card { opacity: 0; transform: translateY(26px); transition: opacity 0.6s ease, transform 0.6s ease, border-color 0.4s ease, box-shadow 0.4s ease; }
.hub-card.shown, .ra-card.shown { opacity: 1; transform: translateY(0); }
.hub-card:hover, .ra-card:hover { transform: translateY(-10px); }
.hub-card.shown:hover, .ra-card.shown:hover { transform: translateY(-10px); }
/* без JS карточки видны */
.no-js .hub-card, .no-js .ra-card { opacity: 1; transform: none; }

/* Пагинация: карточки не прятать на страницах 2+ (анимация оставлена, но пагинатор всегда виден) */
.hub-pager { opacity: 1; }


/* Полезные материалы: контекстные ссылки */
.useful-block {
    margin: 32px 0;
    padding: 24px 28px;
    background: var(--bg-card, #fff);
    border: 1px solid var(--glass-border, rgba(0,35,90,.12));
    border-left: 4px solid var(--orange, #FF5E0E);
    border-radius: var(--radius-md, 12px);
}
.useful-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 18px;
    margin: 0 0 14px;
    color: var(--text-primary, #0B1B2D);
}
.useful-title i { color: var(--orange, #FF5E0E); }
.useful-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.useful-list li { display: flex; align-items: baseline; gap: 8px; }
.useful-list i { color: var(--orange, #FF5E0E); font-size: 12px; }
.useful-list a {
    color: var(--primary-light, #1F4F9F);
    text-decoration: none;
    border-bottom: 1px dashed rgba(31,79,159,.4);
    transition: all .2s;
}
.useful-list a:hover { color: var(--orange, #FF5E0E); border-bottom-color: var(--orange, #FF5E0E); }