/* ============================================================
   Creation Structure & Development Economics
   Design System: Scientific Editorial (Stitch-generated)
   Tokens: Dark Navy #0a0e14 / Gold #c9a84c / Steel Blue #7eb8da
   Typography: Space Grotesk (headlines) / Source Serif 4 (body) / IBM Plex Sans (labels)
   ============================================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300;400;500;600;700&family=Source+Serif+4:ital,opsz,wght@0,8..60,300;0,8..60,400;0,8..60,500;0,8..60,600;0,8..60,700;1,8..60,300;1,8..60,400;1,8..60,500&family=IBM+Plex+Sans:wght@300;400;500;600;700&display=swap');

/* --- CSS Custom Properties --- */
:root {
    /* Backgrounds */
    --bg-primary: #0a0e14;
    --bg-secondary: #11161e;
    --bg-card: #161c26;
    --bg-card-hover: #1c2430;
    --bg-equation: #131a24;
    --bg-chart: #0d1117;

    /* Text */
    --text-primary: #e8ecf1;
    --text-secondary: #b0b8c4;
    --text-muted: #8892a0;
    --text-inverse: #0a0e14;

    /* Accent — Gold */
    --gold-primary: #c9a84c;
    --gold-light: #d4b860;
    --gold-dark: #a88a30;
    --gold-glow: rgba(201, 168, 76, 0.15);
    --gold-glow-strong: rgba(201, 168, 76, 0.25);

    /* Accent — Steel Blue */
    --steel: #7eb8da;
    --steel-light: #a0d0ec;
    --steel-dark: #5a94b8;
    --steel-glow: rgba(126, 184, 218, 0.12);

    /* Borders & Dividers */
    --hairline: rgba(126, 184, 218, 0.15);
    --hairline-gold: rgba(201, 168, 76, 0.2);
    --border-card: rgba(126, 184, 218, 0.1);
    --border-strong: rgba(126, 184, 218, 0.2);

    /* Typography */
    --font-headline: 'Space Grotesk', -apple-system, sans-serif;
    --font-body: 'Source Serif 4', Georgia, 'Times New Roman', serif;
    --font-label: 'IBM Plex Sans', -apple-system, sans-serif;
    --font-mono: 'IBM Plex Mono', 'SF Mono', 'Fira Code', monospace;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;
    --space-5xl: 8rem;

    /* Sizing */
    --max-width: 1200px;
    --nav-height: 64px;
    --border-radius: 4px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
}

/* --- Reset & Base --- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.7;
    min-height: 100vh;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-headline);
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.25rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 3vw, 1.75rem); }
h4 { font-size: 1.125rem; }

p {
    margin-bottom: var(--space-lg);
    color: var(--text-secondary);
}

a {
    color: var(--gold-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--gold-light);
}

/* --- Masthead / Navigation --- */
.masthead {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 14, 20, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--hairline);
    height: var(--nav-height);
}

.masthead-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-xl);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.masthead-brand {
    font-family: var(--font-headline);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.01em;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.masthead-brand .brand-accent {
    color: var(--gold-primary);
    font-weight: 700;
}

.masthead-nav {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    list-style: none;
}

.masthead-nav a {
    font-family: var(--font-label);
    font-size: 0.8125rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--border-radius);
    transition: all var(--transition-fast);
}

.masthead-nav a:hover,
.masthead-nav a.active {
    color: var(--gold-primary);
    background: var(--gold-glow);
}

/* --- Hero Section --- */
.hero {
    padding: var(--space-5xl) var(--space-xl) var(--space-4xl);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle at center, var(--gold-glow) 0%, transparent 70%);
    pointer-events: none;
}

.hero-inner {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero-title {
    color: var(--gold-primary);
    margin-bottom: var(--space-md);
}

.hero-subtitle {
    font-family: var(--font-body);
    font-size: clamp(1.125rem, 2.5vw, 1.375rem);
    font-style: italic;
    font-weight: 400;
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
}

.hero-abstract {
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--text-secondary);
    max-width: 680px;
    margin: 0 auto var(--space-2xl);
}

.hero-abstract .drop-cap::first-letter {
    font-family: var(--font-headline);
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--gold-primary);
    float: left;
    line-height: 0.8;
    margin-right: var(--space-sm);
    margin-top: 0.1em;
}

/* --- Stat Row --- */
.stat-row {
    max-width: var(--max-width);
    margin: 0 auto var(--space-4xl);
    padding: 0 var(--space-xl);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--space-lg);
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-top: 2px solid var(--gold-primary);
    border-radius: var(--border-radius);
    padding: var(--space-xl);
    transition: all var(--transition-base);
}

.stat-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--hairline-gold);
    transform: translateY(-2px);
}

.stat-card-label {
    font-family: var(--font-label);
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--gold-primary);
    margin-bottom: var(--space-sm);
}

.stat-card-title {
    font-family: var(--font-headline);
    font-size: 1.375rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.stat-card-desc {
    font-size: 0.875rem;
    color: var(--text-muted);
    line-height: 1.6;
}

/* --- Prose Section --- */
.prose-section {
    max-width: var(--max-width);
    margin: 0 auto var(--space-4xl);
    padding: 0 var(--space-xl);
}

.prose-section h2 {
    color: var(--gold-primary);
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--hairline);
}

.prose-section h3 {
    color: var(--text-primary);
    margin: var(--space-2xl) 0 var(--space-md);
}

.prose-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
}

@media (max-width: 768px) {
    .prose-columns {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
}

.prose-columns p {
    font-size: 0.9375rem;
    line-height: 1.85;
}

/* --- Equation Display --- */
.equation-display {
    max-width: var(--max-width);
    margin: 0 auto var(--space-3xl);
    padding: var(--space-3xl) var(--space-xl);
    text-align: center;
}

.equation-box {
    display: inline-block;
    background: var(--bg-equation);
    border: 1px solid var(--hairline-gold);
    border-radius: var(--border-radius);
    padding: var(--space-2xl) var(--space-3xl);
    position: relative;
}

.equation-box::before {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: var(--border-radius);
    background: var(--gold-glow);
    z-index: -1;
    filter: blur(8px);
}

.equation-box .eq-main {
    font-family: var(--font-headline);
    font-size: clamp(1.5rem, 3.5vw, 2rem);
    font-weight: 700;
    color: var(--gold-primary);
    letter-spacing: -0.01em;
}

.equation-box .eq-mappings {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
    margin-top: var(--space-xl);
    text-align: left;
}

@media (max-width: 768px) {
    .equation-box .eq-mappings {
        grid-template-columns: 1fr;
    }
}

.eq-mapping {
    padding: var(--space-md);
    border-left: 2px solid var(--hairline-gold);
}

.eq-mapping .map-label {
    font-family: var(--font-label);
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--steel);
    margin-bottom: var(--space-xs);
}

.eq-mapping .map-arrow {
    font-family: var(--font-headline);
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--gold-primary);
    margin-bottom: var(--space-xs);
}

.eq-mapping .map-desc {
    font-size: 0.8125rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* --- Viz Container --- */
.viz-container {
    max-width: var(--max-width);
    margin: 0 auto var(--space-3xl);
    padding: 0 var(--space-xl);
}

.viz-frame {
    background: var(--bg-chart);
    border: 1px solid var(--hairline);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.viz-frame-header {
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--hairline);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.viz-frame-title {
    font-family: var(--font-label);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--steel);
}

.viz-frame-badge {
    font-family: var(--font-label);
    font-size: 0.625rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    background: var(--bg-card);
    padding: 2px 8px;
    border-radius: 2px;
}

.viz-frame-body {
    padding: 0;
    min-height: 420px;
    position: relative;
    width: 100%;
}

.viz-frame-body svg {
    display: block;
    width: 100%;
    height: 100%;
}

.viz-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 420px;
    color: var(--text-muted);
    font-family: var(--font-label);
    font-size: 0.8125rem;
}

.viz-frame-body svg {
    display: block;
    width: 100%;
}

.viz-frame-body svg:focus-visible {
    outline: 2px solid var(--gold-primary);
    outline-offset: 2px;
}

/* --- Skip Link (Accessibility) --- */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-md);
    background: var(--gold-primary);
    color: var(--bg-primary);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--border-radius);
    font-family: var(--font-label);
    font-size: 0.8125rem;
    font-weight: 600;
    z-index: 200;
    transition: top var(--transition-fast);
    text-decoration: none;
}

.skip-link:focus {
    top: var(--space-md);
}

/* --- Main content wrapper for skip link target --- */
#main-content {
    outline: none;
}

/* --- Insight Cards --- */
.insight-grid {
    max-width: var(--max-width);
    margin: 0 auto var(--space-4xl);
    padding: 0 var(--space-xl);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-lg);
}

.insight-card {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--border-radius);
    padding: var(--space-xl);
    transition: all var(--transition-base);
}

.insight-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--hairline-gold);
}

.insight-card .insight-icon {
    display: block;
    width: 28px;
    height: 28px;
    margin-bottom: var(--space-md);
    color: var(--gold-primary);
}

.insight-card .insight-icon svg {
    display: block;
    width: 100%;
    height: 100%;
}

/* --- Brand Hexagon Icon --- */
.brand-hex {
    display: inline-block;
    width: 22px;
    height: 22px;
    vertical-align: middle;
    margin-right: 2px;
    color: var(--gold-primary);
}

.brand-hex svg {
    display: block;
    width: 100%;
    height: 100%;
}

.insight-card h4 {
    font-family: var(--font-headline);
    font-size: 1rem;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.insight-card p {
    font-size: 0.875rem;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 0;
}

/* --- CTA Row --- */
.cta-row {
    max-width: var(--max-width);
    margin: 0 auto var(--space-4xl);
    padding: var(--space-2xl) var(--space-xl);
    text-align: center;
    border-top: 1px solid var(--hairline);
    border-bottom: 1px solid var(--hairline);
}

.cta-row p {
    font-family: var(--font-headline);
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

.cta-button {
    display: inline-block;
    font-family: var(--font-label);
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--bg-primary);
    background: var(--gold-primary);
    padding: var(--space-md) var(--space-2xl);
    border-radius: var(--border-radius);
    transition: all var(--transition-fast);
}

.cta-button:hover {
    background: var(--gold-light);
    color: var(--bg-primary);
    transform: translateY(-1px);
}

.cta-button .arrow {
    margin-left: var(--space-sm);
    transition: transform var(--transition-fast);
}

.cta-button:hover .arrow {
    transform: translateX(4px);
}

/* --- Footer --- */
.site-footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--hairline);
    padding: var(--space-3xl) var(--space-xl) var(--space-xl);
}

.footer-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--space-3xl);
}

@media (max-width: 768px) {
    .footer-inner {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
}

.footer-brand {
    font-family: var(--font-headline);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.footer-brand .brand-accent {
    color: var(--gold-primary);
}

.footer-desc {
    font-size: 0.8125rem;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 0;
}

.footer-col h4 {
    font-family: var(--font-label);
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    margin-bottom: var(--space-md);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--space-sm);
}

.footer-links a {
    font-family: var(--font-label);
    font-size: 0.8125rem;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--gold-primary);
}

.footer-bottom {
    max-width: var(--max-width);
    margin: var(--space-2xl) auto 0;
    padding-top: var(--space-lg);
    border-top: 1px solid var(--hairline);
    text-align: center;
}

.footer-bottom p {
    font-family: var(--font-label);
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0;
}

/* --- Section Divider --- */
.section-divider {
    max-width: var(--max-width);
    margin: 0 auto var(--space-3xl);
    padding: 0 var(--space-xl);
    border: none;
    border-top: 1px solid var(--hairline);
}

/* --- Highlight text --- */
.highlight {
    color: var(--gold-primary);
}

.highlight-blue {
    color: var(--steel);
}

/* --- Responsive nav (mobile) --- */
@media (max-width: 768px) {
    .masthead-inner {
        flex-direction: column;
        height: auto;
        padding: var(--space-md) var(--space-lg);
        gap: var(--space-sm);
    }

    .masthead-nav {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0;
    }

    .masthead-nav a {
        font-size: 0.6875rem;
        padding: var(--space-xs) var(--space-sm);
    }

    .masthead {
        height: auto;
    }

    :root {
        --nav-height: auto;
    }

    .hero {
        padding: var(--space-3xl) var(--space-lg) var(--space-2xl);
    }

    .stat-row {
        grid-template-columns: 1fr;
    }

    .insight-grid {
        grid-template-columns: 1fr;
    }
}

/* --- Page Hero (interior pages) --- */
.page-hero {
    padding: var(--space-4xl) var(--space-xl) var(--space-3xl);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 400px;
    height: 400px;
    background: radial-gradient(circle at center, var(--gold-glow) 0%, transparent 70%);
    pointer-events: none;
}

.page-hero-inner {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.page-hero h1 {
    color: var(--gold-primary);
    margin-bottom: var(--space-md);
}

.page-hero .subtitle {
    font-family: var(--font-body);
    font-size: 1.125rem;
    font-style: italic;
    font-weight: 400;
    color: var(--text-secondary);
}

/* --- Timeline --- */
.timeline {
    max-width: var(--max-width);
    margin: 0 auto var(--space-3xl);
    padding: 0 var(--space-xl);
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    top: 0;
    bottom: 0;
    width: 1px;
    background: var(--hairline);
}

.timeline-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
    margin-bottom: var(--space-2xl);
    position: relative;
}

.timeline-item:nth-child(even) {
    direction: rtl;
}

.timeline-item:nth-child(even) .timeline-content {
    direction: ltr;
}

.timeline-dot {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 12px;
    height: 12px;
    background: var(--gold-primary);
    border-radius: 50%;
    border: 2px solid var(--bg-primary);
    z-index: 2;
    top: 0.5rem;
}

.timeline-era {
    font-family: var(--font-label);
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--gold-primary);
    margin-bottom: var(--space-xs);
}

.timeline-content {
    padding: var(--space-lg);
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--border-radius);
}

.timeline-content h4 {
    margin-bottom: var(--space-sm);
}

.timeline-content p {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 0;
}

@media (max-width: 768px) {
    .timeline::before {
        left: 24px;
    }
    .timeline-item {
        grid-template-columns: 1fr;
        gap: 0;
        padding-left: 48px;
    }
    .timeline-item:nth-child(even) {
        direction: ltr;
    }
    .timeline-dot {
        left: 24px;
    }
}

/* --- Active nav state --- */
.masthead-nav a.active {
    color: var(--gold-primary);
    background: var(--gold-glow);
    border-radius: var(--border-radius);
}

/* --- Navigation implication cards --- */
.nav-implications {
    max-width: var(--max-width);
    margin: 0 auto var(--space-3xl);
    padding: 0 var(--space-xl);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--space-lg);
}

.nav-implication {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--border-radius);
    padding: var(--space-xl);
    border-left: 3px solid var(--gold-primary);
    transition: all var(--transition-base);
}

.nav-implication:hover {
    background: var(--bg-card-hover);
    border-color: var(--hairline-gold);
    transform: translateX(4px);
}

.nav-implication .num {
    font-family: var(--font-headline);
    font-size: 2rem;
    font-weight: 700;
    color: var(--gold-primary);
    opacity: 0.3;
    line-height: 1;
    margin-bottom: var(--space-sm);
}

.nav-implication h4 {
    font-family: var(--font-headline);
    font-size: 1rem;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.nav-implication p {
    font-size: 0.8125rem;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 0;
}

/* --- Section with hairline divider --- */
.stacked-section {
    padding: var(--space-2xl) 0;
    border-top: 1px solid var(--hairline);
}

.stacked-section:first-child {
    border-top: none;
}

.stacked-section h3 {
    color: var(--steel-light);
    margin-bottom: var(--space-lg);
    font-size: 1.375rem;
}

/* --- Subtle animation for stat cards --- */
@keyframes pulse {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 1; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.stat-card {
    animation: fadeInUp 0.5s ease forwards;
}

.stat-card:nth-child(2) { animation-delay: 0.1s; }
.stat-card:nth-child(3) { animation-delay: 0.2s; }
.stat-card:nth-child(4) { animation-delay: 0.3s; }

/* ============================================================
   Stitch-Matched Design Elements
   ============================================================ */

/* --- Journal / Monograph Volume Label --- */
.volume-label {
    font-family: var(--font-label);
    font-size: 0.625rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--steel);
    margin-bottom: var(--space-lg);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.volume-label::before {
    content: '';
    display: inline-block;
    width: 12px;
    height: 1px;
    background: var(--steel);
    opacity: 0.5;
}

/* --- KPI Sub-Label Row --- */
.stat-card-sub {
    font-family: var(--font-label);
    font-size: 0.5625rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--steel-dark);
    margin-bottom: var(--space-xs);
    display: flex;
    align-items: center;
    gap: 4px;
}

.stat-card-value {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-top: var(--space-sm);
    letter-spacing: 0.02em;
}

/* --- Equation Display (LaTeX-style) --- */
.equation-math {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    color: var(--steel-light);
    text-align: center;
    padding: var(--space-md) 0;
    letter-spacing: 0.03em;
    border-left: 2px solid var(--steel-dark);
    margin: var(--space-lg) 0;
    padding-left: var(--space-lg);
}

.equation-ref {
    font-family: var(--font-label);
    font-size: 0.625rem;
    color: var(--text-muted);
    text-align: right;
    font-style: italic;
}

/* --- Figure Labels --- */
.figure-label {
    font-family: var(--font-label);
    font-size: 0.625rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--steel-dark);
    margin-bottom: var(--space-sm);
}

.figure-caption {
    font-family: var(--font-label);
    font-size: 0.6875rem;
    color: var(--text-muted);
    margin-top: var(--space-sm);
    font-style: italic;
}

/* --- Quote Block --- */
.quote-block {
    border-left: 3px solid var(--gold-primary);
    padding: var(--space-md) var(--space-lg);
    margin: var(--space-2xl) 0;
    background: var(--bg-equation);
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
}

.quote-block p {
    font-family: var(--font-body);
    font-size: 1.0625rem;
    font-style: italic;
    color: var(--text-primary);
    margin-bottom: 0;
    line-height: 1.7;
}

/* --- Cross-Sector Tabs --- */
.sector-tabs {
    display: flex;
    gap: 0;
    margin-bottom: 0;
    border-bottom: 1px solid var(--hairline);
}

.sector-tab {
    font-family: var(--font-label);
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    padding: var(--space-sm) var(--space-lg);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all var(--transition-fast);
    background: none;
    border-top: none;
    border-left: none;
    border-right: none;
}

.sector-tab:hover,
.sector-tab.active {
    color: var(--gold-primary);
    border-bottom-color: var(--gold-primary);
}

/* --- Newsletter CTA --- */
.newsletter-cta {
    max-width: var(--max-width);
    margin: 0 auto var(--space-4xl);
    padding: var(--space-3xl) var(--space-xl);
    text-align: center;
    background: var(--bg-card);
    border: 1px solid var(--hairline-gold);
    border-radius: var(--border-radius);
}

.newsletter-cta h3 {
    color: var(--gold-primary);
    margin-bottom: var(--space-md);
}

.newsletter-cta p {
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
    font-size: 0.9375rem;
}

.newsletter-cta .cta-button {
    background: transparent;
    color: var(--gold-primary);
    border: 1px solid var(--gold-primary);
}

.newsletter-cta .cta-button:hover {
    background: var(--gold-primary);
    color: var(--bg-primary);
}

/* --- Interactive Slider Controls --- */
.slider-group {
    margin-bottom: var(--space-lg);
}

.slider-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-xs);
    font-family: var(--font-label);
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.slider-label .name {
    color: var(--text-secondary);
}

.slider-label .value {
    color: var(--gold-primary);
    font-family: var(--font-mono);
}

.slider-track {
    width: 100%;
    height: 6px;
    background: var(--bg-card);
    border-radius: 3px;
    position: relative;
    cursor: pointer;
}

.slider-fill {
    height: 100%;
    background: var(--gold-primary);
    border-radius: 3px;
    transition: width var(--transition-fast);
}

.slider-thumb {
    width: 16px;
    height: 16px;
    background: var(--gold-primary);
    border-radius: 50%;
    position: absolute;
    top: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0 0 8px var(--gold-glow-strong);
}

/* --- Status Indicators --- */
.status-indicators {
    display: flex;
    gap: var(--space-lg);
    flex-wrap: wrap;
    justify-content: center;
    margin: var(--space-lg) 0;
}

.status-indicator {
    text-align: center;
}

.status-indicator .pct {
    font-family: var(--font-headline);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gold-primary);
}

.status-indicator .label {
    font-family: var(--font-label);
    font-size: 0.5625rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
}

/* --- GPT Trajectory Timeline --- */
.gpt-trajectory {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    padding: var(--space-xl) 0;
    position: relative;
    min-height: 160px;
}

.gpt-trajectory::before {
    content: '';
    position: absolute;
    bottom: 20px;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, var(--hairline), var(--hairline-gold), var(--hairline));
}

.gpt-node {
    text-align: center;
    position: relative;
    z-index: 1;
}

.gpt-node .dot {
    width: 10px;
    height: 10px;
    background: var(--gold-primary);
    border-radius: 50%;
    margin: 0 auto var(--space-sm);
    position: relative;
    z-index: 2;
}

.gpt-node .era {
    font-family: var(--font-headline);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.gpt-node .date {
    font-family: var(--font-label);
    font-size: 0.5625rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.gpt-node .bar {
    width: 2px;
    background: var(--gold-primary);
    margin: var(--space-sm) auto 0;
    opacity: 0.3;
}

/* --- Section Eyebrow --- */
.section-eyebrow {
    font-family: var(--font-label);
    font-size: 0.5625rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--steel-dark);
    margin-bottom: var(--space-xs);
}

/* --- Insight CTA links --- */
.insight-card .insight-cta {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-family: var(--font-label);
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--gold-primary);
    margin-top: var(--space-md);
    transition: gap var(--transition-fast);
}

.insight-card .insight-cta:hover {
    gap: 8px;
}

/* --- Icon-Labeled Equation Mappings --- */
.eq-mapping-icon {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
}

.eq-mapping-icon .mapping-icon {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    color: var(--gold-primary);
}

.eq-mapping-icon .mapping-icon svg {
    width: 100%;
    height: 100%;
}

/* --- Mobile adjustments for new elements --- */
@media (max-width: 768px) {
    .gpt-trajectory {
        flex-wrap: wrap;
        gap: var(--space-lg);
        justify-content: center;
    }

    .gpt-trajectory::before {
        display: none;
    }

    .status-indicators {
        gap: var(--space-md);
    }

    .equation-math {
        font-size: 1rem;
        padding-left: var(--space-md);
    }
}