/* single-post.css — Blog article single page */

/* --- Breadcrumbs --- */
.art-crumbs {
    background: var(--color-bg-alt);
    border-bottom: 1px solid var(--color-border-light);
    padding: 14px 0;
}

/* --- Hero (dark) --- */
.art-hero {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    color: #fff;
    padding: 60px 0 52px;
}

.art-hero__cats {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 22px;
}

.art-hero__cat {
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .08em;
    color: #ff8a80;
    background: rgba(192, 57, 43, .18);
    border: 1px solid rgba(192, 57, 43, .35);
    padding: 5px 14px;
    border-radius: var(--radius-full);
    transition: background var(--transition);
}

.art-hero__cat:hover {
    background: rgba(192, 57, 43, .3);
    color: #ff8a80;
}

.art-hero__h1 {
    font-size: clamp(28px, 3.5vw, 48px);
    font-weight: 800;
    color: #fff;
    line-height: 1.12;
    letter-spacing: -.025em;
    max-width: 860px;
    margin-bottom: 28px;
}

.art-hero__meta {
    display: flex;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
    font-size: 13px;
    color: rgba(255, 255, 255, .5);
}

.art-hero__meta time { color: rgba(255, 255, 255, .6); }

.art-hero__author {
    display: flex;
    align-items: center;
    gap: 10px;
    color: rgba(255, 255, 255, .85);
    font-weight: 500;
}

.art-hero__author-dot {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: var(--color-primary);
    flex-shrink: 0;
}

/* --- Cover image --- */
.art-cover {
    padding: 40px 0 0;
    background: var(--color-bg-alt);
}

.art-cover__img {
    width: 100%;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    display: block;
    max-height: 520px;
    object-fit: cover;
}

/* =====================================================
   TWO-COLUMN LAYOUT: TOC + MAIN CONTENT
   ===================================================== */
.art-layout {
    display: grid;
    grid-template-columns: 1fr;
    max-width: 1280px;
    margin: 0 auto;
}

.art-layout--has-toc {
    grid-template-columns: 240px 1fr;
    gap: 0 48px;
}

/* --- TOC sidebar --- */
.art-toc {
    border-right: 1px solid var(--color-border-light);
}

.art-toc__sticky {
    position: sticky;
    top: 96px;
    padding: 40px 24px 40px 32px;
    max-height: calc(100vh - 130px);
    overflow-y: auto;
}

.art-toc__label {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .12em;
    color: var(--color-text-muted);
    margin-bottom: 16px;
}

.art-toc__nav {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.art-toc__link {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 8px 10px;
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: all .2s;
    border-left: 2px solid transparent;
}

.art-toc__link:hover {
    background: var(--color-bg-alt);
    border-left-color: var(--color-border);
}

.art-toc__link.is-active {
    background: var(--color-primary-light);
    border-left-color: var(--color-primary);
}

.art-toc__num {
    flex-shrink: 0;
    font-size: 10px;
    font-weight: 700;
    color: var(--color-primary);
    margin-top: 3px;
    letter-spacing: .05em;
}

.art-toc__link.is-active .art-toc__num { color: var(--color-primary); }

.art-toc__text {
    font-size: 13px;
    line-height: 1.45;
    color: var(--color-text-muted);
    transition: color .2s;
}

.art-toc__link:hover .art-toc__text,
.art-toc__link.is-active .art-toc__text {
    color: var(--color-secondary);
}

/* H3 sub-items in TOC */
.art-toc__link--sub {
    padding-left: 28px;
}
.art-toc__link--sub .art-toc__num {
    font-size: 10px;
    opacity: .6;
}
.art-toc__link--sub .art-toc__text {
    font-size: 12px;
}

/* --- Main content column --- */
.art-main {
    min-width: 0;
}

/* When no TOC — limit content width for readability */
.art-layout:not(.art-layout--has-toc) .art-main {
    max-width: 860px;
    margin-left: auto;
    margin-right: auto;
    width: 100%;
}

/* --- Intro block --- */
.art-intro-wrap {
    padding: 56px 64px 48px;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border-light);
}

.art-intro {
    font-size: 19px;
    line-height: 1.85;
    color: var(--color-text);
    font-weight: 400;
    padding-left: 24px;
    border-left: 4px solid var(--color-primary);
    max-width: 680px;
}

/* =====================================================
   CONTENT SECTIONS — ALTERNATING LIGHT / DARK
   ===================================================== */
.art-section {
    padding: 64px 64px 64px;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border-light);
    position: relative;
    overflow: hidden;
}

/* Decorative background number */
.art-section::before {
    content: var(--sec-num, '');
    position: absolute;
    right: -12px;
    bottom: -20px;
    font-size: 200px;
    font-weight: 900;
    line-height: 1;
    color: rgba(0, 0, 0, .04);
    pointer-events: none;
    user-select: none;
    letter-spacing: -.05em;
}

/* DARK sections */
.art-section--dark {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    border-bottom-color: rgba(255, 255, 255, .06);
}

.art-section--dark::before {
    color: rgba(255, 255, 255, .04);
}

/* Content width limiter */
.art-section__inner {
    max-width: 860px;
    position: relative;
    z-index: 1;
}

/* Section title — red bar decoration */
.art-section__title {
    font-size: clamp(22px, 2.5vw, 30px);
    font-weight: 800;
    color: var(--color-secondary);
    line-height: 1.2;
    margin-bottom: 28px;
    letter-spacing: -.02em;
}

.art-section__title::before {
    content: '';
    display: block;
    width: 44px;
    height: 4px;
    background: var(--color-primary);
    border-radius: 2px;
    margin-bottom: 16px;
}

/* Dark section title */
.art-section--dark .art-section__title {
    color: #fff;
}

/* Section content typography */
.art-section__content p {
    font-size: 16px;
    line-height: 1.85;
    color: var(--color-text);
    margin-bottom: 18px;
}

.art-section--dark .art-section__content p {
    color: rgba(255, 255, 255, .8);
}

.art-section__content h2 {
    font-size: clamp(20px, 2.2vw, 26px);
    font-weight: 800;
    color: var(--color-secondary);
    line-height: 1.25;
    margin: 48px 0 20px;
    letter-spacing: -.02em;
}

.art-section__content h2::before {
    content: '';
    display: block;
    width: 36px;
    height: 3px;
    background: var(--color-primary);
    border-radius: 2px;
    margin-bottom: 14px;
}

.art-section--dark .art-section__content h2 { color: #fff; }

.art-section__content h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-secondary);
    margin: 36px 0 14px;
}

.art-section--dark .art-section__content h3 {
    color: #fff;
}

.art-section__content h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-secondary);
    margin: 26px 0 10px;
}

.art-section--dark .art-section__content h4 {
    color: rgba(255, 255, 255, .9);
}

.art-section__content ul,
.art-section__content ol {
    margin-bottom: 18px;
    padding-left: 24px;
    list-style: disc;
}

.art-section__content ol { list-style: decimal; }

.art-section__content li {
    font-size: 16px;
    line-height: 1.8;
    color: var(--color-text);
    margin-bottom: 8px;
}

.art-section--dark .art-section__content li {
    color: rgba(255, 255, 255, .78);
}

.art-section__content strong { color: var(--color-secondary); }
.art-section--dark .art-section__content strong { color: #fff; }

.art-section__content a {
    color: var(--color-primary);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.art-section--dark .art-section__content a { color: #ff8a80; }
.art-section__content a:hover { opacity: .8; }

.art-section__content blockquote {
    background: var(--color-primary-light);
    border-left: 4px solid var(--color-primary);
    padding: 20px 24px;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    margin: 28px 0;
    font-style: italic;
    color: var(--color-secondary);
}

.art-section--dark .art-section__content blockquote {
    background: rgba(192, 57, 43, .12);
    border-left-color: var(--color-primary);
    color: rgba(255, 255, 255, .9);
}

.art-section__content img {
    width: 100%;
    border-radius: var(--radius-md);
    margin: 28px 0;
}

.art-section__content table {
    width: 100%;
    border-collapse: collapse;
    margin: 28px 0;
    font-size: 15px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.art-section__content th {
    background: var(--color-secondary);
    color: #fff;
    padding: 12px 16px;
    text-align: left;
    font-weight: 600;
}

.art-section__content td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--color-border-light);
    color: var(--color-text);
    vertical-align: top;
}

.art-section__content tr:last-child td { border-bottom: none; }
.art-section__content tr:hover td { background: var(--color-bg-alt); }

/* =====================================================
   EXPERT BLOCK (dark)
   ===================================================== */
.art-expert {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    padding: 56px 64px;
    position: relative;
    overflow: hidden;
}

.art-expert::after {
    content: '✦';
    position: absolute;
    right: 40px;
    bottom: 20px;
    font-size: 100px;
    color: rgba(255, 255, 255, .04);
    pointer-events: none;
}

.art-expert__card {
    max-width: 680px;
    position: relative;
    z-index: 1;
}

.art-expert__icon {
    font-size: 28px;
    color: var(--color-primary);
    margin-bottom: 14px;
    display: block;
}

.art-expert__title {
    font-size: 12px;
    font-weight: 700;
    color: #ff8a80;
    text-transform: uppercase;
    letter-spacing: .12em;
    margin-bottom: 18px;
}

.art-expert__text {
    font-size: 16px;
    line-height: 1.85;
    color: rgba(255, 255, 255, .82);
}

.art-expert__text p { margin-bottom: 14px; }
.art-expert__text p:last-child { margin-bottom: 0; }
.art-expert__text strong { color: #fff; }

/* =====================================================
   FAQ
   ===================================================== */
.art-faq {
    padding: 56px 64px;
    background: var(--color-bg-alt);
    border-bottom: 1px solid var(--color-border-light);
}

.art-faq__title {
    font-size: clamp(20px, 2.2vw, 26px);
    font-weight: 800;
    color: var(--color-secondary);
    margin-bottom: 28px;
    letter-spacing: -.02em;
}

.art-faq__title::before {
    content: '';
    display: block;
    width: 36px;
    height: 4px;
    background: var(--color-primary);
    border-radius: 2px;
    margin-bottom: 14px;
}

.art-faq__list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-width: 680px;
}

/* =====================================================
   SOURCES
   ===================================================== */
.art-sources {
    padding: 32px 64px 40px;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border-light);
}

.art-sources__title {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .1em;
    color: var(--color-text-muted);
    margin-bottom: 12px;
}

.art-sources__list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 6px;
    max-width: 680px;
}

.art-sources__list li { font-size: 13px; color: var(--color-text-muted); }

.art-sources__list a {
    color: var(--color-primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}

/* =====================================================
   TAGS FOOTER
   ===================================================== */
.art-footer {
    background: var(--color-bg-alt);
    border-bottom: 1px solid var(--color-border);
    padding: 24px 64px 32px;
}

.art-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.art-tag {
    font-size: 13px;
    color: var(--color-primary);
    background: var(--color-primary-light);
    padding: 5px 14px;
    border-radius: var(--radius-full);
    transition: all var(--transition);
}

.art-tag:hover {
    background: var(--color-primary);
    color: #fff;
}

/* =====================================================
   AUTHOR CARD (внутри article, под контентом)
   ===================================================== */
.art-author-card {
    grid-column: 1 / -1;
    background: var(--color-bg-alt);
    border-top: 1px solid var(--color-border-light);
    padding: 32px 0;
}

.auc {
    display: flex;
    align-items: flex-start;
    gap: 24px;
    background: #fff;
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    padding: 24px 28px;
    box-shadow: 0 2px 12px rgba(0,0,0,.04);
    max-width: 860px;
}

.auc__avatar {
    flex: 0 0 72px;
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary) 0%, #c0392b 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.auc__initials {
    font-size: 24px;
    font-weight: 800;
    color: #fff;
    letter-spacing: -.02em;
}

.auc__body { flex: 1 1 0; min-width: 0; overflow: hidden; }

.auc__label {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .1em;
    color: var(--color-primary);
    margin-bottom: 4px;
}

.auc__name {
    display: block;
    font-size: 18px;
    font-weight: 700;
    color: var(--color-secondary);
    text-decoration: none;
    margin-bottom: 2px;
    transition: color .2s;
}
.auc__name:hover { color: var(--color-primary); }

.auc__pos {
    font-size: 13px;
    color: var(--color-text-muted);
    margin-bottom: 8px;
}

.auc__bio {
    font-size: 14px;
    line-height: 1.6;
    color: var(--color-text);
    margin: 0;
}

.auc__link {
    flex-shrink: 0;
    font-size: 13px;
    font-weight: 600;
    color: var(--color-primary);
    text-decoration: none;
    white-space: nowrap;
    transition: opacity .2s;
}
.auc__link:hover { opacity: .75; }

@media (max-width: 640px) {
    .auc { flex-wrap: wrap; gap: 16px; }
    .auc__link { width: 100%; text-align: center; }
}

/* =====================================================
   SERVICES CTA (blog → service pages interlinking)
   ===================================================== */
.art-services {
    padding: 48px 0;
    background: var(--color-bg-alt, #f8fafc);
}

.art-services__title {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-heading);
    margin-bottom: 20px;
}

.art-services__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.art-services__card {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 20px;
    background: #fff;
    border: 1px solid var(--color-border, #e2e8f0);
    border-radius: 10px;
    text-decoration: none;
    color: inherit;
    transition: border-color .2s, transform .2s;
}

.art-services__card:hover {
    border-color: var(--color-primary, #e63946);
    transform: translateY(-2px);
}

.art-services__card-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-heading);
}

.art-services__card-note {
    font-size: 13px;
    color: var(--color-primary, #e63946);
    font-weight: 500;
}

@media (max-width: 640px) {
    .art-services__grid { grid-template-columns: 1fr; }
    .art-services { padding: 32px 0; }
}

/* =====================================================
   RELATED POSTS (outside layout)
   ===================================================== */
.art-related {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    padding: 64px 0 72px;
}

.art-related__title {
    font-size: clamp(22px, 2.5vw, 30px);
    font-weight: 800;
    color: #fff;
    letter-spacing: -.02em;
    margin-bottom: 8px;
}

.art-related__sub {
    font-size: 15px;
    color: rgba(255, 255, 255, .5);
    margin-bottom: 40px;
}

.art-related__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

/* Post cards inside related block */
.art-related .post-card {
    display: flex;
    flex-direction: column;
    background: rgba(255, 255, 255, .05);
    border: 1px solid rgba(255, 255, 255, .1);
    border-radius: var(--radius-lg);
    overflow: hidden;
    text-decoration: none;
    transition: all .25s;
}

.art-related .post-card:hover {
    background: rgba(255, 255, 255, .09);
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, .35);
}

.art-related .post-card__img {
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: rgba(255, 255, 255, .06);
    position: relative;
}

.art-related .post-card__img::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(10, 20, 50, 0.45);
    pointer-events: none;
}

.art-related .post-card__img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .35s;
}

.art-related .post-card:hover .post-card__img img {
    transform: scale(1.05);
}

.art-related .post-card__img--placeholder {
    background: linear-gradient(135deg, rgba(192, 57, 43, .15), rgba(255, 255, 255, .05));
}

.art-related .post-card__body {
    padding: 20px 22px 24px;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.art-related .post-card__cat {
    display: block;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .1em;
    color: #ff8a80;
    margin-bottom: 10px;
}

.art-related .post-card__title {
    font-size: 16px;
    font-weight: 700;
    color: #fff;
    line-height: 1.4;
    margin-bottom: 16px;
    flex: 1;
    transition: color .2s;
}

.art-related .post-card:hover .post-card__title {
    color: #ffd0cc;
}

.art-related .post-card__footer {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: auto;
}

.art-related .post-card__date {
    font-size: 12px;
    color: rgba(255, 255, 255, .4);
}

.art-related .post-card__read {
    font-size: 12px;
    color: rgba(255, 255, 255, .35);
}

/* =====================================================
   RESPONSIVE
   ===================================================== */
@media (max-width: 1100px) {
    .art-layout--has-toc {
        grid-template-columns: 200px 1fr;
    }
    .art-toc__sticky { padding: 32px 16px 32px 24px; }
    .art-section,
    .art-expert,
    .art-faq,
    .art-sources,
    .art-footer { padding-left: 36px; padding-right: 36px; }
    .art-intro-wrap { padding: 48px 36px; }
}

@media (max-width: 960px) {
    .art-layout {
        grid-template-columns: 1fr;
        gap: 0;
    }
    .art-toc {
        border-right: none;
        border-bottom: 1px solid var(--color-border-light);
    }
    .art-toc__sticky {
        position: static;
        padding: 20px 24px;
        max-height: none;
    }
    .art-toc__label { margin-bottom: 10px; }
    .art-toc__nav { flex-direction: row; flex-wrap: wrap; gap: 4px; }
    .art-toc__link { padding: 5px 10px; font-size: 12px; }
    .art-toc__num { display: none; }
    .art-section,
    .art-expert,
    .art-faq,
    .art-sources,
    .art-footer { padding-left: 24px; padding-right: 24px; }
    .art-intro-wrap { padding: 36px 24px; }
    .art-related__grid { grid-template-columns: repeat(2, 1fr); }
    .art-related { padding: 48px 0 56px; }
}

@media (max-width: 640px) {
    .art-hero { padding: 40px 0 36px; }
    .art-intro { font-size: 16px; }
    .art-section { padding: 40px 20px; }
    .art-section__title { font-size: 22px; }
    .art-expert,
    .art-faq { padding: 40px 20px; }
    .art-sources,
    .art-footer { padding-left: 20px; padding-right: 20px; }
    .art-related__grid { grid-template-columns: 1fr; }
}