/* blog.css — article listing + long-form article typography
 * Built on the SSSTuning design tokens (tokens.css). No new colours.
 */

/* ======================================================================
   BLOG HUB / LISTING
   ====================================================================== */
.blog-hero {
    position: relative;
    padding-top: calc(var(--header-h) + clamp(2.5rem, 7vw, 5rem));
    padding-bottom: clamp(1.5rem, 4vw, 2.5rem);
    overflow: clip;
    isolation: isolate;
}

.blog-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    z-index: -2;
    background: radial-gradient(60% 50% at 18% 0%, rgba(232, 87, 138, 0.10) 0%, transparent 62%);
}

.blog-hero .eyebrow { margin-bottom: var(--space-sm); }

.blog-hero h1 {
    font-size: var(--text-h1);
    font-weight: var(--weight-black);
    letter-spacing: -0.035em;
    margin-bottom: var(--space-md);
}

.blog-hero .hero-lead {
    color: var(--text-secondary);
    font-size: var(--text-lead);
    max-width: 60ch;
    margin-bottom: var(--space-lg);
}

/* search field */
.blog-search {
    position: relative;
    max-width: 480px;
}

.blog-search svg {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    stroke: var(--text-muted);
    fill: none;
    pointer-events: none;
}

.blog-search input {
    width: 100%;
    padding: 0.95rem 1rem 0.95rem 3rem;
    background: var(--bg-card);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-pill);
    color: var(--text-primary);
    font-size: 1rem;
    transition: border-color var(--dur-fast) var(--ease-out),
                box-shadow var(--dur-fast) var(--ease-out),
                background-color var(--dur-fast) var(--ease-out);
}

.blog-search input::placeholder { color: var(--text-muted); }

.blog-search input:hover { border-color: var(--border-accent); }

.blog-search input:focus {
    outline: none;
    border-color: var(--accent);
    background: var(--bg-card-hover);
    box-shadow: 0 0 0 3px var(--accent-dim);
}

/* stats strip */
.blog-stats {
    max-width: var(--content-max);
    margin-inline: auto;
    padding-inline: var(--gutter);
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
    padding-block: var(--space-lg);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.blog-stat-num {
    font-family: var(--font-display);
    font-size: clamp(1.6rem, 3vw, 2.2rem);
    font-weight: var(--weight-black);
    color: var(--white);
    line-height: 1;
    letter-spacing: -0.03em;
}

.blog-stat-num span { color: var(--accent); }

.blog-stat-label {
    margin-top: var(--space-3xs);
    font-size: var(--text-xs);
    color: var(--text-muted);
}

/* featured (pillar) article */
.featured-article {
    max-width: var(--content-max);
    margin-inline: auto;
    padding-inline: var(--gutter);
    padding-top: var(--space-2xl);
}

.featured-card {
    position: relative;
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: clamp(1.5rem, 4vw, 3rem);
    align-items: center;
    background: var(--bg-card);
    border: 1px solid var(--border-accent);
    border-radius: var(--radius-xl);
    padding: clamp(1.75rem, 4vw, 2.75rem);
    overflow: hidden;
}

.featured-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(60% 80% at 85% 20%, rgba(232, 87, 138, 0.14) 0%, transparent 65%);
    pointer-events: none;
}

.featured-card > * { position: relative; }

.featured-tag {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2xs);
    padding: 0.4rem 0.85rem;
    border-radius: var(--radius-pill);
    background: var(--accent);
    color: var(--bg-deep);
    font-family: var(--font-display);
    font-size: var(--text-label);
    font-weight: var(--weight-bold);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: var(--space-md);
}

.featured-card h2 {
    font-size: clamp(1.6rem, 3.6vw, 2.4rem);
    font-weight: var(--weight-black);
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-sm);
}

.featured-card h2 a { color: var(--white); }

.featured-card > div > p {
    color: var(--text-secondary);
    font-size: var(--text-body);
    max-width: 48ch;
    margin-bottom: var(--space-md);
}

.featured-visual {
    display: grid;
    place-items: center;
    min-height: 220px;
    border-radius: var(--radius-lg);
    background: radial-gradient(70% 70% at 50% 30%, rgba(232, 87, 138, 0.18) 0%, transparent 70%);
    border: 1px solid var(--border);
}

.featured-visual .featured-num {
    font-family: var(--font-display);
    font-weight: var(--weight-black);
    font-size: clamp(4rem, 10vw, 7rem);
    line-height: 1;
    letter-spacing: -0.05em;
    color: var(--white);
}

.featured-visual .featured-num span { color: var(--accent); }

.featured-visual .featured-sub {
    margin-top: var(--space-2xs);
    font-size: var(--text-xs);
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--text-muted);
}

/* filter bar (pill buttons) */
.filter-bar {
    position: sticky;
    top: var(--header-h);
    z-index: 50;
    background: color-mix(in srgb, var(--bg-deep) 88%, transparent);
    backdrop-filter: blur(14px) saturate(140%);
    -webkit-backdrop-filter: blur(14px) saturate(140%);
    border-bottom: 1px solid var(--border);
}

.filter-bar-inner {
    max-width: var(--content-max);
    margin-inline: auto;
    padding-block: var(--space-sm);
    padding-inline: var(--gutter);
    display: flex;
    gap: var(--space-2xs);
    overflow-x: auto;
    scrollbar-width: none;
}

.filter-bar-inner::-webkit-scrollbar { display: none; }

.filter-btn {
    flex-shrink: 0;
    padding: 0.55rem 1.1rem;
    font-family: var(--font-display);
    font-size: var(--text-sm);
    font-weight: var(--weight-semibold);
    color: var(--text-secondary);
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-pill);
    white-space: nowrap;
    transition:
        color var(--dur-fast) var(--ease-out),
        background-color var(--dur-fast) var(--ease-out),
        border-color var(--dur-fast) var(--ease-out);
}

.filter-btn:hover {
    color: var(--text-primary);
    border-color: var(--border-strong);
}

.filter-btn.is-active {
    color: var(--bg-deep);
    background: var(--accent);
    border-color: var(--accent);
}

/* article listing */
.article-listing {
    max-width: var(--content-max);
    margin-inline: auto;
    padding-block: var(--space-2xl);
    padding-inline: var(--gutter);
}

.listing-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.listing-head h2 {
    font-size: var(--text-h2);
    font-weight: var(--weight-black);
}

.listing-count {
    font-size: var(--text-sm);
    color: var(--text-muted);
    font-family: var(--font-display);
    font-weight: var(--weight-medium);
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
    gap: var(--space-lg);
}

/* card */
.article-card {
    position: relative;
    display: flex;
    flex-direction: column;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: clamp(1.4rem, 2.6vw, 1.85rem);
    overflow: hidden;
    transition:
        transform var(--dur-mid) var(--ease-out),
        border-color var(--dur-mid) var(--ease-out),
        background-color var(--dur-mid) var(--ease-out),
        box-shadow var(--dur-mid) var(--ease-out);
}

.article-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    height: 2px;
    width: 100%;
    background: var(--gradient-accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--dur-mid) var(--ease-out);
}

.article-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-accent);
    background: var(--bg-card-hover);
    box-shadow: var(--shadow-card);
}

.article-card:hover::before { transform: scaleX(1); }

.article-card.is-hidden { display: none; }

.article-card-cat {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2xs);
    font-family: var(--font-display);
    font-size: var(--text-label);
    font-weight: var(--weight-semibold);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: var(--space-sm);
}

.cat-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent);
    flex-shrink: 0;
}

.article-card h3 {
    font-size: clamp(1.15rem, 2vw, 1.35rem);
    font-weight: var(--weight-bold);
    line-height: 1.2;
    margin-bottom: var(--space-2xs);
}

.article-card h3 a { color: var(--white); }

.article-card p {
    color: var(--text-secondary);
    font-size: var(--text-sm);
    flex-grow: 1;
    margin-bottom: var(--space-md);
}

.article-card-foot {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-sm);
    padding-top: var(--space-sm);
    border-top: 1px solid var(--border);
}

.article-card-read {
    font-family: var(--font-display);
    font-size: var(--text-sm);
    font-weight: var(--weight-semibold);
    color: var(--accent);
    transition: gap var(--dur-fast) var(--ease-out);
}

.article-card:hover .article-card-read { color: var(--accent-bright); }

.article-card-time {
    font-size: var(--text-xs);
    color: var(--text-muted);
}

/* empty state when filter/search yields nothing */
.no-results {
    text-align: center;
    padding: var(--space-2xl) var(--gutter);
    color: var(--text-muted);
    display: none;
}

.no-results.is-visible { display: block; }

.no-results h3 {
    font-size: var(--text-h4);
    color: var(--text-secondary);
    margin-bottom: var(--space-2xs);
}

@media (max-width: 900px) {
    .featured-card { grid-template-columns: 1fr; }
    .featured-visual { min-height: 160px; order: -1; }
    .blog-stats { grid-template-columns: repeat(2, 1fr); gap: var(--space-lg); }
}

@media (max-width: 560px) {
    .blog-stats { grid-template-columns: 1fr 1fr; }
    .listing-head { flex-direction: column; align-items: flex-start; gap: var(--space-2xs); }
}

/* ======================================================================
   ARTICLE DETAIL PAGE
   ====================================================================== */
.article-page { padding-top: var(--header-h); }

/* breadcrumb */
.breadcrumb {
    max-width: 820px;
    margin-inline: auto;
    padding: var(--space-md) var(--gutter) 0;
    font-size: var(--text-xs);
    color: var(--text-muted);
}

.breadcrumb ol {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.35rem;
}

.breadcrumb li { display: flex; align-items: center; gap: 0.35rem; }
.breadcrumb li::after { content: '›'; color: var(--text-muted); opacity: 0.6; }
.breadcrumb li:last-child::after { display: none; }

.breadcrumb a { color: var(--text-secondary); transition: color var(--dur-fast) var(--ease-out); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb li[aria-current] { color: var(--text-secondary); }

/* article hero */
.article-hero {
    max-width: 820px;
    margin-inline: auto;
    padding: var(--space-md) var(--gutter) var(--space-lg);
    text-align: center;
}

.article-hero .article-card-cat {
    justify-content: center;
    margin-bottom: var(--space-md);
}

.article-hero h1 {
    font-size: clamp(2rem, 5.4vw, 3.3rem);
    font-weight: var(--weight-black);
    letter-spacing: -0.035em;
    line-height: 1.08;
    margin-bottom: var(--space-md);
}

.article-hero .article-subtitle {
    color: var(--text-secondary);
    font-size: var(--text-lead);
    max-width: 56ch;
    margin-inline: auto;
    margin-bottom: var(--space-md);
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    color: var(--text-muted);
    font-size: var(--text-sm);
    padding-top: var(--space-md);
    border-top: 1px solid var(--border);
}

.article-meta-item { display: inline-flex; align-items: center; gap: var(--space-2xs); }
.article-meta-item strong { color: var(--text-secondary); font-weight: var(--weight-semibold); }

/* table of contents */
.toc {
    max-width: 820px;
    margin: var(--space-md) auto 0;
    padding: var(--space-md) clamp(1.5rem, 4vw, 2rem);
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
}

.toc-title {
    font-family: var(--font-display);
    font-size: var(--text-label);
    font-weight: var(--weight-semibold);
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: var(--space-sm);
}

.toc ol {
    list-style: none;
    counter-reset: toc;
    display: grid;
    gap: var(--space-2xs);
}

.toc li {
    counter-increment: toc;
    font-size: var(--text-sm);
    line-height: 1.4;
}

.toc li a {
    display: flex;
    gap: var(--space-2xs);
    color: var(--text-secondary);
    transition: color var(--dur-fast) var(--ease-out);
}

.toc li a::before {
    content: counter(toc, decimal-leading-zero);
    font-family: var(--font-display);
    font-weight: var(--weight-bold);
    color: var(--accent);
    flex-shrink: 0;
}

.toc li a:hover { color: var(--accent); }

/* ======================================================================
   PROSE — long-form readable typography
   ====================================================================== */
.article-body {
    max-width: 760px;
    margin-inline: auto;
    padding: var(--space-xl) var(--gutter);
    font-size: clamp(1.0625rem, 1.4vw, 1.18rem);
    line-height: 1.78;
    color: var(--text-secondary);
}

.article-body > * { margin-block: 0; }
.article-body > * + * { margin-top: 1.4em; }
.article-body > h2 + *,
.article-body > h3 + * { margin-top: 0.8em; }

.article-body h2 {
    font-size: clamp(1.5rem, 3.2vw, 2.05rem);
    font-weight: var(--weight-black);
    color: var(--white);
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-top: 2.4em;
    padding-top: 1.6em;
    border-top: 1px solid var(--border);
    scroll-margin-top: calc(var(--header-h) + 1rem);
}

.article-body h2:first-child {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
}

.article-body h3 {
    font-size: clamp(1.2rem, 2.2vw, 1.5rem);
    font-weight: var(--weight-bold);
    color: var(--white);
    line-height: 1.25;
    margin-top: 2em;
    scroll-margin-top: calc(var(--header-h) + 1rem);
}

.article-body h4 {
    font-size: 1.08rem;
    font-weight: var(--weight-semibold);
    color: var(--white);
    margin-top: 1.6em;
    letter-spacing: 0;
}

.article-body p { color: var(--text-secondary); }

.article-body p > strong,
.article-body strong { color: var(--text-primary); font-weight: var(--weight-semibold); }

.article-body a {
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 3px;
    text-decoration-thickness: 1px;
    text-decoration-color: var(--accent-dim);
    transition: text-decoration-color var(--dur-fast) var(--ease-out);
}

.article-body a:hover { text-decoration-color: var(--accent); }

/* lists */
.article-body ul,
.article-body ol {
    padding-left: 1.4em;
    display: grid;
    gap: 0.55em;
}

.article-body li { color: var(--text-secondary); }
.article-body li::marker { color: var(--accent); }

.article-body ul li::marker { content: '—  '; }

/* lead paragraph — emphasised opener */
.article-body .lead {
    font-size: clamp(1.15rem, 1.8vw, 1.4rem);
    line-height: 1.6;
    color: var(--text-primary);
    font-weight: var(--weight-medium);
}

/* callout / highlight box */
.callout {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border-accent);
    border-left: 3px solid var(--accent);
    border-radius: var(--radius-md);
    padding: clamp(1.1rem, 2.4vw, 1.5rem);
    margin-block: 2em;
}

.callout-title {
    display: flex;
    align-items: center;
    gap: var(--space-2xs);
    font-family: var(--font-display);
    font-size: var(--text-sm);
    font-weight: var(--weight-bold);
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: var(--space-2xs);
}

.callout p:last-child { margin-bottom: 0; }
.callout p { color: var(--text-secondary); font-size: 1rem; line-height: 1.65; }

/* blockquote */
.article-body blockquote {
    border-left: 3px solid var(--accent);
    padding: var(--space-2xs) 0 var(--space-2xs) var(--space-md);
    color: var(--text-primary);
    font-style: italic;
    font-size: 1.05em;
}

/* tables */
.article-body table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    font-size: 0.95rem;
}

.article-body thead { background: var(--bg-surface); }

.article-body th {
    text-align: left;
    font-family: var(--font-display);
    font-weight: var(--weight-semibold);
    color: var(--white);
    padding: var(--space-sm) var(--space-md);
    font-size: var(--text-sm);
    letter-spacing: 0.02em;
}

.article-body td {
    padding: var(--space-sm) var(--space-md);
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
}

.article-body tbody tr { transition: background-color var(--dur-fast) var(--ease-out); }
.article-body tbody tr:hover { background: var(--bg-card-hover); }
.article-body td strong { color: var(--white); }

/* FAQ block */
.faq-block {
    max-width: 760px;
    margin-inline: auto;
    padding: var(--space-xl) var(--gutter);
}

.faq-list {
    display: grid;
    gap: var(--space-sm);
}

.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: border-color var(--dur-fast) var(--ease-out);
}

.faq-item[open] { border-color: var(--border-accent); }

.faq-item summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
    padding: var(--space-md);
    font-family: var(--font-display);
    font-weight: var(--weight-semibold);
    font-size: clamp(1rem, 1.5vw, 1.1rem);
    color: var(--white);
    cursor: pointer;
    list-style: none;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
    content: '+';
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: var(--accent-dim);
    border: 1px solid var(--border-accent);
    color: var(--accent);
    font-size: 1.3rem;
    font-weight: var(--weight-regular);
    line-height: 1;
    transition: transform var(--dur-fast) var(--ease-out),
                background-color var(--dur-fast) var(--ease-out);
}

.faq-item[open] summary::after { content: '−'; background: var(--accent); color: var(--bg-deep); }

.faq-item .faq-answer {
    padding: 0 var(--space-md) var(--space-md);
    color: var(--text-secondary);
    line-height: 1.7;
}

.faq-item .faq-answer p + p { margin-top: 0.8em; }

/* ======================================================================
   ARTICLE CTA + RELATED
   ====================================================================== */
.article-cta {
    max-width: 820px;
    margin-inline: auto;
    padding: var(--space-md) var(--gutter) var(--space-2xl);
}

.article-cta-inner {
    position: relative;
    overflow: hidden;
    background: var(--bg-card);
    border: 1px solid var(--border-accent);
    border-radius: var(--radius-xl);
    padding: clamp(1.75rem, 4vw, 2.75rem);
    text-align: center;
}

.article-cta-inner::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(70% 80% at 50% 0%, rgba(232, 87, 138, 0.14) 0%, transparent 70%);
    pointer-events: none;
}

.article-cta-inner > * { position: relative; }

.article-cta-inner .eyebrow { justify-content: center; }

.article-cta-inner h2 {
    font-size: var(--text-h3);
    font-weight: var(--weight-black);
    margin-block: var(--space-sm) var(--space-2xs);
}

.article-cta-inner p {
    color: var(--text-secondary);
    max-width: 50ch;
    margin-inline: auto;
    margin-bottom: var(--space-md);
}

.article-cta-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    justify-content: center;
}

/* related articles */
.related {
    max-width: var(--content-max);
    margin-inline: auto;
    padding: var(--space-lg) var(--gutter) var(--space-section);
}

.related-head {
    margin-bottom: var(--space-xl);
    text-align: center;
}

.related-head .eyebrow { justify-content: center; margin-bottom: var(--space-2xs); }
.related-head h2 { font-size: var(--text-h2); font-weight: var(--weight-black); }

.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
}

/* responsive */
@media (max-width: 560px) {
    .article-body { font-size: 1.0625rem; }
    .article-meta { gap: var(--space-sm); }
}