/* ==========================================================================
   CALCULOVER BLOG STYLESHEET (assets/css/blog.css)
   Consolidated, modern styles for all blog articles (/blog/<slug>/)
   ========================================================================== */

/* ── Reset & Chrome ────────────────────────────────────────────────────── */
.brand-text {
    font-family: var(--calc-font-headline, 'Plus Jakarta Sans', sans-serif);
    font-weight: 800;
}

.fade-in {
    animation: fadeIn 0.4s ease-out forwards;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* ── Reading Progress Bar (Fixed Top) ─────────────────────────────────── */
.reading-progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    width: 0%;
    background: linear-gradient(90deg, var(--calc-cyan, #22d3ee), var(--calc-gold, #fbbf24));
    z-index: 9999;
    transition: width 0.08s linear;
    pointer-events: none;
}

/* ── Article Layout Container ─────────────────────────────────────────── */
.article-wrap {
    max-width: 760px;
    margin: 0 auto;
    padding: 3rem 1.5rem 5rem;
    position: relative;
}

.article-wrap.data-study-wrap {
    max-width: 880px;
}

/* Subtle category ambient glow behind header */
.article-wrap::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 700px;
    max-width: 100vw;
    height: 320px;
    background: radial-gradient(circle, rgba(var(--article-cat-rgb, 34, 211, 238), 0.07) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

/* ── Breadcrumbs ───────────────────────────────────────────────────────── */
.article-breadcrumb {
    font-size: 0.82rem;
    color: var(--calc-text-dim, #7b90a8);
    margin-bottom: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.45rem;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

.article-breadcrumb a {
    color: var(--calc-text-muted, #94a3b8);
    text-decoration: none;
    transition: color 0.2s ease;
}

.article-breadcrumb a:hover {
    color: var(--calc-gold, #fbbf24);
}

.article-breadcrumb .sep {
    color: rgba(255, 255, 255, 0.2);
    font-size: 0.8rem;
}

/* ── Category Badges ──────────────────────────────────────────────────── */
.article-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 0.28rem 0.75rem;
    border-radius: 9999px;
    margin-bottom: 1.1rem;
    width: fit-content;
    position: relative;
    z-index: 1;
    transition: all 0.2s ease;
    background: rgba(34, 211, 238, 0.12);
    color: var(--calc-cyan, #22d3ee);
    border: 1px solid rgba(34, 211, 238, 0.28);
}

.badge--finance {
    background: rgba(226, 184, 90, 0.15);
    color: #e2b85a;
    border-color: rgba(226, 184, 90, 0.3);
}

.badge--health {
    background: rgba(168, 85, 247, 0.15);
    color: #c084fc;
    border-color: rgba(168, 85, 247, 0.3);
}

.badge--business {
    background: rgba(96, 165, 250, 0.15);
    color: #60a5fa;
    border-color: rgba(96, 165, 250, 0.3);
}

.badge--construction {
    background: rgba(34, 211, 238, 0.15);
    color: #22d3ee;
    border-color: rgba(34, 211, 238, 0.3);
}

.badge--math {
    background: rgba(129, 140, 248, 0.15);
    color: #818cf8;
    border-color: rgba(129, 140, 248, 0.3);
}

.badge--daily {
    background: rgba(52, 211, 153, 0.15);
    color: #34d399;
    border-color: rgba(52, 211, 153, 0.3);
}

.badge--environment {
    background: rgba(163, 230, 53, 0.15);
    color: #a3e635;
    border-color: rgba(163, 230, 53, 0.3);
}

.badge--sports {
    background: rgba(251, 146, 60, 0.15);
    color: #fb923c;
    border-color: rgba(251, 146, 60, 0.3);
}

.badge--legal {
    background: rgba(251, 113, 133, 0.15);
    color: #fb7185;
    border-color: rgba(251, 113, 133, 0.3);
}

.badge--education {
    background: rgba(244, 114, 182, 0.15);
    color: #f472b6;
    border-color: rgba(244, 114, 182, 0.3);
}

/* ── Article Header & Title ───────────────────────────────────────────── */
.article-title {
    font-family: var(--calc-font-headline, 'Plus Jakarta Sans', sans-serif);
    font-size: clamp(1.9rem, 4vw, 2.75rem);
    font-weight: 800;
    line-height: 1.16;
    color: var(--calc-text-primary, #f8fafc);
    margin-bottom: 1.1rem;
    letter-spacing: -0.02em;
    position: relative;
    z-index: 1;
}

.article-title span {
    color: var(--calc-gold, #fbbf24);
}

/* ── Meta Byline Bar ──────────────────────────────────────────────────── */
.article-meta {
    font-family: var(--calc-font-mono, 'JetBrains Mono', monospace);
    font-size: 0.78rem;
    color: var(--calc-text-muted, #94a3b8);
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.75rem;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

.article-meta span {
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

.article-author {
    font-weight: 600;
    color: var(--calc-text-secondary, #cbd5e1);
}

.article-verified {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-weight: 600;
    color: var(--calc-emerald, #34d399);
}

.article-divider {
    border: none;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    margin: 1.5rem 0 2rem;
}

/* ── Social Share Bar ─────────────────────────────────────────────────── */
.article-share {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin-bottom: 2.25rem;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

.article-share__label {
    font-family: var(--calc-font-mono, 'JetBrains Mono', monospace);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--calc-text-dim, #7b90a8);
}

.article-share__btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-family: var(--calc-font-mono, 'JetBrains Mono', monospace);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.35rem 0.75rem;
    border-radius: 9999px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: rgba(255, 255, 255, 0.04);
    color: var(--calc-text-secondary, #cbd5e1);
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
}

.article-share__btn:hover {
    border-color: rgba(34, 211, 238, 0.4);
    color: var(--calc-cyan, #22d3ee);
    background: rgba(34, 211, 238, 0.08);
    transform: translateY(-1px);
}

/* ── Table of Contents ─────────────────────────────────────────────────── */
.article-toc {
    background: rgba(255, 255, 255, 0.035);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    padding: 1.25rem 1.5rem;
    margin: 1.75rem 0 2.5rem;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.article-toc__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.article-toc__title {
    font-family: var(--calc-font-headline, 'Plus Jakarta Sans', sans-serif);
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--calc-gold, #fbbf24);
    margin: 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.article-toc__list {
    margin: 0.85rem 0 0;
    padding-left: 1.35rem;
    list-style: decimal;
}

.article-toc__list li {
    margin-bottom: 0.5rem;
    font-size: 0.92rem;
    color: var(--calc-text-muted, #94a3b8);
}

.article-toc__list a {
    color: var(--calc-text-secondary, #cbd5e1);
    text-decoration: none;
    transition: all 0.2s ease;
}

.article-toc__list a:hover,
.article-toc__list a.active {
    color: var(--calc-cyan, #22d3ee);
    font-weight: 600;
    padding-left: 2px;
}

/* ── Article Body & Typography ────────────────────────────────────────── */
.article-body {
    color: var(--calc-text-secondary, #cbd5e1);
    line-height: 1.8;
    font-size: 1.05rem;
}

.article-body p {
    margin-bottom: 1.4rem;
}

.lede {
    font-size: 1.18rem;
    line-height: 1.75;
    color: var(--calc-text-primary, #f8fafc);
    font-weight: 450;
    margin-bottom: 1.75rem;
}

.article-body h2 {
    font-family: var(--calc-font-headline, 'Plus Jakarta Sans', sans-serif);
    font-size: 1.55rem;
    font-weight: 700;
    color: var(--calc-text-primary, #f8fafc);
    margin: 3rem 0 1rem;
    scroll-margin-top: 90px;
    position: relative;
    letter-spacing: -0.01em;
}

.article-body h3 {
    font-family: var(--calc-font-headline, 'Plus Jakarta Sans', sans-serif);
    font-size: 1.22rem;
    font-weight: 700;
    color: #e2e8f0;
    margin: 2.25rem 0 0.75rem;
    scroll-margin-top: 90px;
}

.article-body strong {
    color: #ffffff;
    font-weight: 700;
}

.article-body a {
    color: var(--calc-cyan, #22d3ee);
    text-decoration: underline;
    text-underline-offset: 3px;
    transition: color 0.2s ease;
}

.article-body a:hover {
    color: var(--calc-gold, #fbbf24);
}

.article-body ul,
.article-body ol {
    margin: 0 0 1.5rem 1.5rem;
}

.article-body ul li,
.article-body ol li {
    margin-bottom: 0.5rem;
    color: var(--calc-text-secondary, #cbd5e1);
}

/* Heading anchor permalinks */
.heading-anchor {
    opacity: 0;
    color: var(--calc-text-dim, #7b90a8);
    text-decoration: none !important;
    margin-left: 0.4rem;
    font-size: 0.85em;
    font-weight: 400;
    transition: opacity 0.2s ease, color 0.2s ease;
}

.article-body h2:hover .heading-anchor,
.article-body h3:hover .heading-anchor {
    opacity: 0.75;
}

.heading-anchor:hover {
    color: var(--calc-cyan, #22d3ee) !important;
    opacity: 1 !important;
}

/* ── Callout Boxes ────────────────────────────────────────────────────── */
.callout {
    background: rgba(255, 255, 255, 0.035);
    border-left: 3.5px solid var(--calc-gold, #fbbf24);
    border-radius: 0 12px 12px 0;
    padding: 1.25rem 1.5rem;
    margin: 2rem 0;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
}

.callout-label {
    font-family: var(--calc-font-mono, 'JetBrains Mono', monospace);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--calc-gold, #fbbf24);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.callout code {
    display: block;
    font-family: var(--calc-font-mono, 'JetBrains Mono', monospace);
    font-size: 0.95rem;
    color: var(--calc-cyan, #22d3ee);
    line-height: 1.6;
    white-space: pre-wrap;
    overflow-wrap: break-word;
    background: rgba(0, 0, 0, 0.25);
    padding: 0.6rem 0.8rem;
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.06);
    margin: 0.4rem 0;
}

.callout p {
    margin: 0.5rem 0 0;
    font-size: 0.94rem;
    color: var(--calc-text-secondary, #cbd5e1);
}

.formula-copy-btn {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.12);
    color: var(--calc-text-muted, #94a3b8);
    font-size: 0.72rem;
    padding: 0.2rem 0.55rem;
    border-radius: 4px;
    cursor: pointer;
    font-family: var(--calc-font-mono, 'JetBrains Mono', monospace);
    transition: all 0.2s;
}

.formula-copy-btn:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.16);
    border-color: rgba(34, 211, 238, 0.4);
}

.callout--tip {
    border-left-color: var(--calc-teal, #2dd4bf);
}
.callout--tip .callout-label {
    color: var(--calc-teal, #2dd4bf);
}

.callout--warning {
    border-left-color: var(--calc-amber, #f59e0b);
}
.callout--warning .callout-label {
    color: var(--calc-amber, #f59e0b);
}

.callout.disclaimer {
    border-left-color: #64748b;
    background: rgba(255, 255, 255, 0.02);
}
.callout.disclaimer .callout-label {
    color: #94a3b8;
}

/* ── Key Takeaways Card ───────────────────────────────────────────────── */
.key-takeaways-card {
    background: rgba(251, 191, 36, 0.04);
    border: 1px solid rgba(251, 191, 36, 0.2);
    border-radius: 14px;
    padding: 1.5rem 1.75rem;
    margin: 2.5rem 0;
}

.key-takeaways-card h2,
.key-takeaways-card h3 {
    color: var(--calc-gold, #fbbf24) !important;
    margin-top: 0 !important;
    font-size: 1.15rem !important;
}

.key-takeaways-card ul {
    margin: 0.75rem 0 0 1.25rem;
}

.key-takeaways-card li {
    margin-bottom: 0.5rem;
    color: var(--calc-text-secondary, #cbd5e1);
}

/* ── Responsive Data Tables & Stat Cards ──────────────────────────────── */
.table-scroll {
    overflow-x: auto;
    margin: 1.75rem 0;
    -webkit-overflow-scrolling: touch;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    background: rgba(255, 255, 255, 0.02);
}

.data-table,
.key-facts {
    width: 100%;
    border-collapse: collapse;
    margin: 0;
    font-size: 0.9rem;
}

.data-table caption {
    caption-side: top;
    text-align: left;
    font-size: 0.8rem;
    color: var(--calc-text-muted, #94a3b8);
    padding: 0.6rem 0.8rem;
    font-style: italic;
}

.data-table th,
.key-facts th {
    background: rgba(255, 255, 255, 0.06);
    color: #ffffff;
    font-weight: 700;
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
    font-family: var(--calc-font-headline, 'Plus Jakarta Sans', sans-serif);
    font-size: 0.85rem;
}

.data-table td,
.key-facts td {
    padding: 0.7rem 1rem;
    color: var(--calc-text-secondary, #cbd5e1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.data-table tr:last-child td,
.key-facts tr:last-child td {
    border-bottom: none;
}

.data-table tr:hover td,
.key-facts tr:hover td {
    background: rgba(255, 255, 255, 0.03);
}

.data-table td strong,
.key-facts td strong {
    color: #ffffff;
}

/* Stat Cards */
.shs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
    margin: 2rem 0 2.5rem;
}

.shs-card {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.09);
    border-radius: 14px;
    padding: 1.25rem 1.3rem;
}

.shs-num {
    font-family: var(--calc-font-mono, 'JetBrains Mono', monospace);
    font-size: 1.85rem;
    font-weight: 800;
    color: var(--calc-gold, #fbbf24);
    line-height: 1.05;
    letter-spacing: -0.02em;
}

.shs-card.teal .shs-num { color: var(--calc-teal, #2dd4bf); }
.shs-card.rose .shs-num { color: var(--calc-rose, #fb7185); }

.shs-label {
    font-size: 0.82rem;
    color: var(--calc-text-muted, #94a3b8);
    margin-top: 0.55rem;
    line-height: 1.45;
}

/* Charts (for data studies) */
.study-fig { margin: 2rem 0; }
.study-chart-wrap {
    position: relative;
    background: rgba(255, 255, 255, 0.025);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 14px;
    padding: 1.2rem 1rem 0.8rem;
}
.study-figcaption {
    font-size: 0.8rem;
    color: var(--calc-text-muted, #94a3b8);
    margin-top: 0.75rem;
    line-height: 1.5;
}

/* ── Standout Typography & Highlights ────────────────────────────────── */
.pull-quote {
    position: relative;
    margin: 2.25rem 0;
    padding: 1.25rem 1.75rem 1.25rem 2rem;
    border-left: 4px solid var(--calc-cyan, #22d3ee);
    background: rgba(34, 211, 238, 0.04);
    border-radius: 0 12px 12px 0;
    font-size: 1.12rem;
    line-height: 1.65;
    color: var(--calc-text-primary, #f8fafc);
    font-style: italic;
}

.pull-quote cite {
    display: block;
    font-size: 0.82rem;
    font-style: normal;
    font-weight: 600;
    color: var(--calc-text-muted, #94a3b8);
    margin-top: 0.6rem;
    letter-spacing: 0.02em;
}

.key-stat {
    display: inline-flex;
    align-items: baseline;
    gap: 0.35rem;
    padding: 0.15rem 0.5rem;
    margin: 0 0.2rem;
    border-radius: 6px;
    background: rgba(251, 191, 36, 0.12);
    border: 1px solid rgba(251, 191, 36, 0.28);
    color: var(--calc-gold, #fbbf24);
    font-family: var(--calc-font-mono, 'JetBrains Mono', monospace);
    font-size: 0.9em;
    font-weight: 700;
    white-space: nowrap;
}

.key-stat--cyan {
    background: rgba(34, 211, 238, 0.12);
    border-color: rgba(34, 211, 238, 0.28);
    color: var(--calc-cyan, #22d3ee);
}

.key-stat--emerald {
    background: rgba(52, 211, 153, 0.12);
    border-color: rgba(52, 211, 153, 0.28);
    color: var(--calc-emerald, #34d399);
}

/* ── Inline SVG Diagrams / Charts ────────────────────────────────────── */
.article-visual {
    margin: 2.25rem 0;
    background: rgba(255, 255, 255, 0.025);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 14px;
    padding: 1.25rem 1.25rem 1rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.article-visual__header {
    margin-bottom: 0.85rem;
}

.article-visual__title {
    font-family: var(--calc-font-headline, 'Plus Jakarta Sans', sans-serif);
    font-size: 0.98rem;
    font-weight: 700;
    color: var(--calc-text-primary, #f8fafc);
    margin: 0 0 0.25rem;
}

.article-visual__subtitle {
    font-size: 0.82rem;
    color: var(--calc-text-muted, #94a3b8);
    margin: 0;
}

.article-visual__svg-wrap {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.article-visual svg {
    display: block;
    width: 100%;
    height: auto;
    max-width: 100%;
}

.article-visual__caption {
    font-size: 0.78rem;
    color: var(--calc-text-dim, #7b90a8);
    margin-top: 0.75rem;
    line-height: 1.45;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 0.6rem;
}

/* ── Related Reading (Blog-to-Blog) ──────────────────────────────────── */
.related-reading {
    margin-top: 3.5rem;
    padding-top: 2.25rem;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.related-reading h2 {
    font-family: var(--calc-font-headline, 'Plus Jakarta Sans', sans-serif);
    font-size: 1.25rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.related-reading-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
}

.related-reading-card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 1.15rem 1.25rem;
    background: rgba(255, 255, 255, 0.035);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    text-decoration: none;
    color: var(--calc-text-secondary, #cbd5e1);
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.related-reading-card:hover {
    border-color: rgba(34, 211, 238, 0.4);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35), 0 0 16px rgba(34, 211, 238, 0.1);
    color: #ffffff;
}

.reading-card-title {
    color: #ffffff;
    font-weight: 700;
    font-size: 0.95rem;
    margin-bottom: 0.4rem;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 0.5rem;
    line-height: 1.35;
}

.reading-card-title::after {
    content: '→';
    font-family: var(--calc-font-mono, 'JetBrains Mono', monospace);
    font-size: 0.9rem;
    color: var(--calc-cyan, #22d3ee);
    flex-shrink: 0;
    transition: transform 0.2s;
}

.related-reading-card:hover .reading-card-title::after {
    transform: translateX(3px);
}

.reading-card-desc {
    font-size: 0.82rem;
    color: var(--calc-text-muted, #94a3b8);
    line-height: 1.5;
    margin-bottom: 0.75rem;
    flex: 1;
}

.reading-card-tag {
    font-family: var(--calc-font-mono, 'JetBrains Mono', monospace);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--calc-text-dim, #7b90a8);
}

/* ── Screen-Reader Utility ───────────────────────────────────────────── */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ── Interactive FAQ Accordions ───────────────────────────────────────── */
.faq-section {
    margin-top: 3rem;
}

.faq-item {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 10px;
    margin-bottom: 0.75rem;
    overflow: hidden;
    transition: border-color 0.2s, background 0.2s;
}

.faq-item:hover {
    border-color: rgba(255, 255, 255, 0.16);
    background: rgba(255, 255, 255, 0.045);
}

.faq-question {
    padding: 1rem 1.25rem;
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-family: var(--calc-font-headline, 'Plus Jakarta Sans', sans-serif);
    font-size: 1.05rem;
    font-weight: 700;
    color: #ffffff;
    user-select: none;
}

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

.faq-question::after {
    content: '+';
    font-family: var(--calc-font-mono, 'JetBrains Mono', monospace);
    font-size: 1.25rem;
    color: var(--calc-text-dim, #7b90a8);
    transition: transform 0.2s ease, color 0.2s ease;
}

.faq-item[open] .faq-question::after {
    content: '−';
    color: var(--calc-cyan, #22d3ee);
}

.faq-answer {
    padding: 0 1.25rem 1.15rem;
    color: var(--calc-text-secondary, #cbd5e1);
    font-size: 0.96rem;
    line-height: 1.7;
}

.faq-answer p {
    margin: 0;
}

/* ── Author Bio Card (E-E-A-T) ────────────────────────────────────────── */
.article-author-card {
    background: rgba(255, 255, 255, 0.035);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 14px;
    padding: 1.5rem;
    margin: 3.5rem 0 2rem;
    display: flex;
    gap: 1.25rem;
    align-items: flex-start;
}

.article-author-avatar {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(34, 211, 238, 0.2), rgba(168, 85, 247, 0.2));
    border: 1px solid rgba(255, 255, 255, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: var(--calc-gold, #fbbf24);
}

.article-author-info h3 {
    margin: 0 0 0.35rem;
    font-size: 1.05rem;
    font-family: var(--calc-font-headline, 'Plus Jakarta Sans', sans-serif);
    color: #ffffff;
}

.article-author-bio {
    font-size: 0.88rem;
    color: var(--calc-text-muted, #94a3b8);
    line-height: 1.6;
    margin: 0;
}

.article-author-bio a {
    color: var(--calc-cyan, #22d3ee);
    text-decoration: underline;
}

/* ── Sources & Citations Section ──────────────────────────────────────── */
.sources-section {
    margin-top: 2.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.source-list {
    font-size: 0.88rem;
    line-height: 1.7;
    color: var(--calc-text-muted, #94a3b8);
    padding-left: 1.25rem;
}

.source-list li {
    margin-bottom: 0.6rem;
}

.source-list a {
    color: var(--calc-cyan, #22d3ee);
    word-break: break-all;
}

/* ── Related Calculators ──────────────────────────────────────────────── */
.related-calcs {
    margin-top: 3.5rem;
    padding-top: 2.25rem;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.related-calcs h2 {
    font-family: var(--calc-font-headline, 'Plus Jakarta Sans', sans-serif);
    font-size: 1.25rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 1.25rem;
}

.related-calcs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
    gap: 1rem;
}

.related-calc-link {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 1.15rem 1.25rem;
    background: rgba(255, 255, 255, 0.035);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    text-decoration: none;
    color: var(--calc-text-secondary, #cbd5e1);
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.related-calc-link:hover {
    border-color: rgba(34, 211, 238, 0.4);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35), 0 0 16px rgba(34, 211, 238, 0.1);
    color: #ffffff;
}

.related-calc-link .calc-link-name {
    color: #ffffff;
    font-weight: 700;
    font-size: 0.95rem;
    margin-bottom: 0.35rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.related-calc-link .calc-link-name::after {
    content: '↗';
    font-family: var(--calc-font-mono, 'JetBrains Mono', monospace);
    font-size: 0.9rem;
    color: var(--calc-cyan, #22d3ee);
    transition: transform 0.2s;
}

.related-calc-link:hover .calc-link-name::after {
    transform: translate(2px, -2px);
}

.related-calc-link .calc-link-desc {
    font-size: 0.82rem;
    color: var(--calc-text-muted, #94a3b8);
    line-height: 1.5;
    font-weight: 400;
}

/* ── Next-Step Affiliate / Resource Section ────────────────────────────── */
.blog-next-step {
    margin-top: 2.5rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.blog-next-step h3 {
    font-family: var(--calc-font-headline, 'Plus Jakarta Sans', sans-serif);
    font-size: 1.1rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 0.5rem;
}

.blog-next-step__disclosure {
    font-size: 0.75rem;
    color: var(--calc-text-muted, #94a3b8);
    font-style: italic;
    margin-bottom: 1rem;
}

.blog-next-step__disclosure a {
    color: var(--calc-text-secondary, #cbd5e1);
    text-decoration: underline;
}

.next-step-card {
    display: block;
    padding: 1.1rem 1.3rem;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 10px;
    text-decoration: none;
    transition: border-color 0.2s, background 0.2s;
}

.next-step-card:hover {
    border-color: rgba(34, 211, 238, 0.3);
    background: rgba(255, 255, 255, 0.06);
}

.next-step-card__title {
    display: block;
    font-weight: 700;
    color: #fff;
    font-size: 0.95rem;
    margin-bottom: 0.3rem;
}

.next-step-card__desc {
    display: block;
    font-size: 0.82rem;
    color: var(--calc-text-muted, #94a3b8);
    line-height: 1.6;
    margin-bottom: 0.4rem;
}

.next-step-card__type {
    display: inline-block;
    font-family: var(--calc-font-mono, 'JetBrains Mono', monospace);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--calc-text-muted, #94a3b8);
    background: rgba(255, 255, 255, 0.06);
    padding: 0.15rem 0.5rem;
    border-radius: 10px;
}

/* ── Resources CTA ─────────────────────────────────────────────────────── */
.article-resources-cta {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    font-size: 0.88rem;
    color: var(--calc-text-muted, #94a3b8);
}

.article-resources-cta a {
    color: var(--calc-cyan, #22d3ee);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.article-resources-cta a:hover {
    color: var(--calc-gold, #fbbf24);
}

/* ══════════════════════════════════════════════════════════════════════
   LIGHT MODE PALETTE
   ══════════════════════════════════════════════════════════════════════ */
[data-theme='light'] .article-wrap::before {
    background: radial-gradient(circle, rgba(var(--article-cat-rgb, 8, 145, 178), 0.05) 0%, transparent 70%);
}

[data-theme='light'] .article-breadcrumb {
    color: #64748b;
}

[data-theme='light'] .article-breadcrumb a {
    color: #475569;
}

[data-theme='light'] .article-breadcrumb a:hover {
    color: var(--calc-cyan-accessible, #0891b2);
}

[data-theme='light'] .article-breadcrumb .sep {
    color: #94a3b8;
}

[data-theme='light'] .article-badge {
    background: rgba(8, 145, 178, 0.08);
    color: var(--calc-cyan-accessible, #0891b2);
    border-color: rgba(8, 145, 178, 0.25);
}

[data-theme='light'] .badge--finance {
    background: rgba(180, 83, 9, 0.08);
    color: #b45309;
    border-color: rgba(180, 83, 9, 0.25);
}

[data-theme='light'] .badge--health {
    background: rgba(124, 58, 237, 0.08);
    color: var(--calc-purple-accessible, #7c3aed);
    border-color: rgba(124, 58, 237, 0.25);
}

[data-theme='light'] .badge--business {
    background: rgba(37, 99, 235, 0.08);
    color: #2563eb;
    border-color: rgba(37, 99, 235, 0.25);
}

[data-theme='light'] .badge--construction {
    background: rgba(15, 118, 110, 0.08);
    color: #0f766e;
    border-color: rgba(15, 118, 110, 0.25);
}

[data-theme='light'] .badge--math {
    background: rgba(8, 145, 178, 0.08);
    color: var(--calc-cyan-accessible, #0891b2);
    border-color: rgba(8, 145, 178, 0.25);
}

[data-theme='light'] .badge--daily {
    background: rgba(180, 83, 9, 0.08);
    color: #92400e;
    border-color: rgba(180, 83, 9, 0.25);
}

[data-theme='light'] .badge--environment {
    background: rgba(21, 128, 61, 0.08);
    color: #15803d;
    border-color: rgba(21, 128, 61, 0.25);
}

[data-theme='light'] .badge--sports {
    background: rgba(194, 65, 12, 0.08);
    color: #c2410c;
    border-color: rgba(194, 65, 12, 0.25);
}

[data-theme='light'] .badge--legal {
    background: rgba(124, 58, 237, 0.08);
    color: #6d28d9;
    border-color: rgba(124, 58, 237, 0.25);
}

[data-theme='light'] .badge--education {
    background: rgba(37, 99, 235, 0.08);
    color: #1d4ed8;
    border-color: rgba(37, 99, 235, 0.25);
}

[data-theme='light'] .article-title {
    color: #0f172a;
}

[data-theme='light'] .article-title span {
    color: var(--calc-cyan-accessible, #0891b2);
}

[data-theme='light'] .article-meta {
    color: #64748b;
}

[data-theme='light'] .article-author {
    color: #334155;
}

[data-theme='light'] .article-divider {
    border-top-color: rgba(0, 0, 0, 0.12);
}

[data-theme='light'] .article-share__label {
    color: #64748b;
}

[data-theme='light'] .article-share__btn {
    border-color: rgba(0, 0, 0, 0.12);
    background: rgba(0, 0, 0, 0.03);
    color: #475569;
}

[data-theme='light'] .article-share__btn:hover {
    border-color: rgba(8, 145, 178, 0.4);
    color: var(--calc-cyan-accessible, #0891b2);
    background: rgba(8, 145, 178, 0.06);
}

[data-theme='light'] .article-toc {
    background: #f0f4f9;
    border-color: rgba(0, 0, 0, 0.1);
}

[data-theme='light'] .article-toc__title {
    color: var(--calc-cyan-accessible, #0891b2);
}

[data-theme='light'] .article-toc__list li {
    color: #475569;
}

[data-theme='light'] .article-toc__list a {
    color: #475569;
}

[data-theme='light'] .article-toc__list a:hover,
[data-theme='light'] .article-toc__list a.active {
    color: var(--calc-cyan-accessible, #0891b2);
}

[data-theme='light'] .article-body {
    color: #475569;
}

[data-theme='light'] .lede {
    color: #1e293b;
}

[data-theme='light'] .article-body h2 {
    color: #0f172a;
}

[data-theme='light'] .article-body h3 {
    color: #1e293b;
}

[data-theme='light'] .article-body strong {
    color: #0f172a;
}

[data-theme='light'] .article-body a {
    color: var(--calc-cyan-accessible, #0891b2);
}

[data-theme='light'] .article-body a:hover {
    color: #0c5e75;
}

[data-theme='light'] .article-body ul li,
[data-theme='light'] .article-body ol li {
    color: #475569;
}

[data-theme='light'] .callout {
    background: #fffbeb;
    border-left-color: #d97706;
}

[data-theme='light'] .callout-label {
    color: #92400e;
}

[data-theme='light'] .callout code {
    color: var(--calc-cyan-accessible, #0891b2);
    background: #f8fafc;
    border-color: rgba(0, 0, 0, 0.08);
}

[data-theme='light'] .callout p {
    color: #475569;
}

[data-theme='light'] .callout--tip {
    background: #f0fdfa;
    border-left-color: #0f766e;
}
[data-theme='light'] .callout--tip .callout-label {
    color: #0f766e;
}

[data-theme='light'] .callout--warning {
    background: #fffbeb;
    border-left-color: #d97706;
}
[data-theme='light'] .callout--warning .callout-label {
    color: #92400e;
}

[data-theme='light'] .callout.disclaimer {
    background: #f1f5f9;
    border-left-color: #64748b;
}
[data-theme='light'] .callout.disclaimer .callout-label {
    color: #475569;
}

[data-theme='light'] .key-takeaways-card {
    background: #fffbeb;
    border-color: rgba(217, 119, 6, 0.25);
}
[data-theme='light'] .key-takeaways-card h2,
[data-theme='light'] .key-takeaways-card h3 {
    color: #92400e !important;
}
[data-theme='light'] .key-takeaways-card li {
    color: #475569;
}

[data-theme='light'] .table-scroll {
    border-color: rgba(0, 0, 0, 0.1);
    background: #ffffff;
}

[data-theme='light'] .data-table caption,
[data-theme='light'] .study-figcaption,
[data-theme='light'] .source-list {
    color: #64748b;
}

[data-theme='light'] .data-table th,
[data-theme='light'] .key-facts th {
    background: #edf2f9;
    color: #0f172a;
    border-bottom-color: rgba(0, 0, 0, 0.12);
}

[data-theme='light'] .data-table td,
[data-theme='light'] .key-facts td {
    color: #334155;
    border-bottom-color: rgba(0, 0, 0, 0.07);
}

[data-theme='light'] .data-table td strong,
[data-theme='light'] .key-facts td strong {
    color: #0f172a;
}

[data-theme='light'] .data-table tr:hover td,
[data-theme='light'] .key-facts tr:hover td {
    background: #f0f4f9;
}

[data-theme='light'] .shs-card {
    background: #ffffff;
    border-color: rgba(0, 0, 0, 0.1);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

[data-theme='light'] .shs-num {
    color: #b45309;
}

[data-theme='light'] .shs-card.teal .shs-num { color: #0f766e; }
[data-theme='light'] .shs-card.rose .shs-num { color: #be123c; }
[data-theme='light'] .shs-label { color: #64748b; }

[data-theme='light'] .study-chart-wrap {
    background: #ffffff;
    border-color: rgba(0, 0, 0, 0.1);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

[data-theme='light'] .faq-item {
    background: #ffffff;
    border-color: rgba(0, 0, 0, 0.1);
}

[data-theme='light'] .faq-item:hover {
    border-color: rgba(0, 0, 0, 0.2);
    background: #f8fafc;
}

[data-theme='light'] .faq-question {
    color: #0f172a;
}

[data-theme='light'] .faq-question::after {
    color: #64748b;
}

[data-theme='light'] .faq-item[open] .faq-question::after {
    color: var(--calc-cyan-accessible, #0891b2);
}

[data-theme='light'] .faq-answer {
    color: #475569;
}

[data-theme='light'] .article-author-card {
    background: #ffffff;
    border-color: rgba(0, 0, 0, 0.1);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

[data-theme='light'] .article-author-avatar {
    background: #f0f4f9;
    border-color: rgba(0, 0, 0, 0.12);
    color: #b45309;
}

[data-theme='light'] .article-author-info h3 {
    color: #0f172a;
}

[data-theme='light'] .article-author-bio {
    color: #64748b;
}

[data-theme='light'] .sources-section {
    border-top-color: rgba(0, 0, 0, 0.1);
}

[data-theme='light'] .related-calcs {
    border-top-color: rgba(0, 0, 0, 0.12);
}

[data-theme='light'] .related-calcs h2 {
    color: #0f172a;
}

[data-theme='light'] .related-calc-link {
    background: #ffffff;
    border-color: rgba(0, 0, 0, 0.12);
    color: #475569;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

[data-theme='light'] .related-calc-link:hover {
    border-color: rgba(8, 145, 178, 0.35);
    color: #0f172a;
    box-shadow: 0 2px 10px rgba(8, 145, 178, 0.08);
}

[data-theme='light'] .related-calc-link .calc-link-name {
    color: #0f172a;
}

[data-theme='light'] .related-calc-link .calc-link-name::after {
    color: var(--calc-cyan-accessible, #0891b2);
}

[data-theme='light'] .related-calc-link .calc-link-desc {
    color: #64748b;
}

[data-theme='light'] .blog-next-step {
    border-top-color: rgba(0, 0, 0, 0.1);
}

[data-theme='light'] .blog-next-step h3 {
    color: #0f172a;
}

[data-theme='light'] .blog-next-step__disclosure {
    color: #64748b;
}

[data-theme='light'] .blog-next-step__disclosure a {
    color: #475569;
}

[data-theme='light'] .next-step-card {
    background: #ffffff;
    border-color: rgba(0, 0, 0, 0.12);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

[data-theme='light'] .next-step-card:hover {
    border-color: rgba(8, 145, 178, 0.35);
    box-shadow: 0 2px 10px rgba(8, 145, 178, 0.08);
}

[data-theme='light'] .next-step-card__title {
    color: #0f172a;
}

[data-theme='light'] .next-step-card__desc {
    color: #475569;
}

[data-theme='light'] .next-step-card__type {
    color: #64748b;
    background: #f0f4f9;
}

[data-theme='light'] .article-resources-cta {
    border-top-color: rgba(0, 0, 0, 0.08);
    color: #475569;
}

[data-theme='light'] .article-resources-cta a {
    color: var(--calc-cyan-accessible, #0891b2);
}

[data-theme='light'] .article-resources-cta a:hover {
    color: #0c5e75;
}

[data-theme='light'] .pull-quote {
    border-left-color: var(--calc-cyan-accessible, #0891b2);
    background: #f0fdfa;
    color: #0f172a;
}

[data-theme='light'] .pull-quote cite {
    color: #64748b;
}

[data-theme='light'] .key-stat {
    background: #fef3c7;
    border-color: rgba(217, 119, 6, 0.35);
    color: #b45309;
}

[data-theme='light'] .key-stat--cyan {
    background: #ecfeff;
    border-color: rgba(8, 145, 178, 0.35);
    color: var(--calc-cyan-accessible, #0891b2);
}

[data-theme='light'] .key-stat--emerald {
    background: #ecfdf5;
    border-color: rgba(16, 185, 129, 0.35);
    color: #047857;
}

[data-theme='light'] .article-visual {
    background: #ffffff;
    border-color: rgba(0, 0, 0, 0.1);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

[data-theme='light'] .article-visual__title {
    color: #0f172a;
}

[data-theme='light'] .article-visual__subtitle {
    color: #64748b;
}

[data-theme='light'] .article-visual__caption {
    color: #64748b;
    border-top-color: rgba(0, 0, 0, 0.06);
}

[data-theme='light'] .related-reading {
    border-top-color: rgba(0, 0, 0, 0.12);
}

[data-theme='light'] .related-reading h2 {
    color: #0f172a;
}

[data-theme='light'] .related-reading-card {
    background: #ffffff;
    border-color: rgba(0, 0, 0, 0.12);
    color: #475569;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

[data-theme='light'] .related-reading-card:hover {
    border-color: rgba(8, 145, 178, 0.35);
    color: #0f172a;
    box-shadow: 0 2px 10px rgba(8, 145, 178, 0.08);
}

[data-theme='light'] .reading-card-title {
    color: #0f172a;
}

[data-theme='light'] .reading-card-title::after {
    color: var(--calc-cyan-accessible, #0891b2);
}

[data-theme='light'] .reading-card-desc {
    color: #64748b;
}

[data-theme='light'] .reading-card-tag {
    color: #94a3b8;
}

/* ── Print Styles ─────────────────────────────────────────────────────── */
@media print {
    .glass-navbar,
    .article-share,
    .reading-progress-bar,
    .calc-back-to-top,
    .foot,
    .related-calcs,
    .blog-next-step,
    .formula-copy-btn,
    .heading-anchor {
        display: none !important;
    }

    .article-wrap {
        max-width: 100% !important;
        padding: 0 !important;
    }

    body {
        background: #ffffff !important;
        color: #000000 !important;
    }

    .article-body {
        color: #111111 !important;
        font-size: 11pt !important;
        line-height: 1.6 !important;
    }

    .faq-item {
        border: none !important;
        background: none !important;
    }

    .faq-item[open],
    .faq-item {
        display: block !important;
    }

    .faq-answer {
        display: block !important;
        padding: 0.5rem 0 !important;
    }
}

/* ── Mobile Polish (< 640px) ─────────────────────────────────────────── */
@media (max-width: 640px) {
    .article-wrap {
        padding: 2rem 1.1rem 4rem;
    }

    .article-title {
        font-size: 1.85rem;
    }

    .article-body {
        font-size: 1rem;
        line-height: 1.75;
    }

    .article-body h2 {
        font-size: 1.35rem;
        margin: 2.25rem 0 0.75rem;
    }

    .article-body h3 {
        font-size: 1.1rem;
    }

    .shs-num {
        font-size: 1.55rem;
    }

    .article-author-card {
        flex-direction: column;
        gap: 0.75rem;
    }
}