/* ========================================
   Technology Diffusion & Education Access
   Professional Economist Aesthetic
   ======================================== */

:root {
    --color-bg: #fafaf7;
    --color-bg-alt: #f2f1ec;
    --color-bg-dark: #1a1f2e;
    --color-text: #2c2c2c;
    --color-text-muted: #6b6b6b;
    --color-text-light: #999;
    --color-accent: #1e3a5f;
    --color-accent-light: #2d5a8e;
    --color-accent-subtle: #e8eef5;
    --color-border: #ddd9d0;
    --color-border-light: #eae6de;
    --color-positive: #2d7d46;
    --color-positive-bg: #e8f5ec;
    --color-warning: #c4720a;
    --color-warning-bg: #fff4e5;
    --color-critical: #b5443a;
    --color-critical-bg: #fde8e6;
    --color-chart-1: #1e3a5f;
    --color-chart-2: #c4720a;
    --color-chart-3: #2d7d46;
    --color-chart-4: #8b5e3c;
    --color-chart-5: #6b4c8a;
    --color-chart-6: #b5443a;
    --font-serif: 'Crimson Text', Georgia, 'Times New Roman', serif;
    --font-sans: 'Source Sans 3', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --max-width: 1200px;
    --section-padding: 5rem;
}

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

/* ---- Navigation ---- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(250, 250, 247, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border-light);
    transition: box-shadow 0.3s ease;
}

.nav.scrolled {
    box-shadow: 0 1px 8px rgba(0,0,0,0.06);
}

.nav-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
}

.nav-brand {
    font-family: var(--font-mono);
    font-weight: 500;
    font-size: 0.875rem;
    letter-spacing: 0.15em;
    color: var(--color-accent);
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-text-muted);
    text-decoration: none;
    letter-spacing: 0.02em;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--color-accent);
}

.nav-hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 4px;
}

.nav-hamburger span {
    display: block;
    width: 20px;
    height: 1.5px;
    background: var(--color-text);
    transition: all 0.3s;
}

.nav-mobile {
    display: none;
    flex-direction: column;
    padding: 1rem 2rem 1.5rem;
    border-top: 1px solid var(--color-border-light);
}

.nav-mobile.open {
    display: flex;
}

.nav-mobile a {
    padding: 0.5rem 0;
    font-size: 0.875rem;
    color: var(--color-text-muted);
    text-decoration: none;
}

/* ---- Hero ---- */
.hero {
    position: relative;
    min-height: 85vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #1a1f2e 0%, #2a3550 50%, #1e3a5f 100%);
    padding-top: 56px;
    overflow: hidden;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(45, 90, 142, 0.15) 0%, transparent 70%),
        radial-gradient(ellipse at 80% 20%, rgba(196, 114, 10, 0.08) 0%, transparent 60%);
    pointer-events: none;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    padding: 4rem 2rem;
}

.hero-tag {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: rgba(255,255,255,0.5);
    margin-bottom: 1.5rem;
}

.hero h1 {
    font-family: var(--font-serif);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    color: #fff;
    line-height: 1.15;
    margin-bottom: 1.25rem;
    max-width: 700px;
}

.hero-sub {
    font-size: 1.15rem;
    font-weight: 300;
    color: rgba(255,255,255,0.65);
    max-width: 560px;
    line-height: 1.6;
    margin-bottom: 3.5rem;
}

.hero-stats {
    display: flex;
    align-items: center;
    gap: 2.5rem;
    padding: 2rem 2.5rem;
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 8px;
    backdrop-filter: blur(8px);
    max-width: fit-content;
}

.hero-stat-value {
    display: block;
    font-family: var(--font-mono);
    font-size: 2rem;
    font-weight: 500;
    color: #fff;
    letter-spacing: -0.02em;
}

.hero-stat-label {
    display: block;
    font-size: 0.775rem;
    color: rgba(255,255,255,0.45);
    margin-top: 0.25rem;
    max-width: 180px;
    line-height: 1.4;
}

.hero-stat-divider {
    width: 1px;
    height: 48px;
    background: rgba(255,255,255,0.1);
}

/* ---- Sections ---- */
.section {
    padding: var(--section-padding) 0;
}

.section-alt {
    background: var(--color-bg-alt);
}

.section-dark {
    background: var(--color-bg-dark);
    color: #e0e0e0;
}

.section-header {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--color-accent);
    display: flex;
    align-items: baseline;
    gap: 1rem;
}

.section-dark .section-header {
    border-bottom-color: rgba(255,255,255,0.2);
}

.section-number {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    color: var(--color-text-light);
    flex-shrink: 0;
}

.section-dark .section-number {
    color: rgba(255,255,255,0.35);
}

.section h2 {
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-text);
    line-height: 1.2;
}

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

.section-intro {
    font-size: 1.05rem;
    color: var(--color-text-muted);
    max-width: 780px;
    margin-bottom: 2.5rem;
    line-height: 1.75;
}

.section-intro-light {
    color: rgba(255,255,255,0.6);
}

/* ---- Grid Layouts ---- */
.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

/* ---- Prose ---- */
.prose .lead {
    font-size: 1.1rem;
    line-height: 1.75;
    color: var(--color-text);
    margin-bottom: 1.25rem;
}

.prose p {
    margin-bottom: 1rem;
    color: var(--color-text-muted);
    line-height: 1.75;
}

.prose em {
    font-family: var(--font-serif);
    font-style: italic;
    color: var(--color-text);
}

/* ---- Key Findings ---- */
.key-findings h3 {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--color-text-light);
    margin-bottom: 1.25rem;
}

.finding {
    display: flex;
    gap: 1rem;
    padding: 1rem 0;
    border-bottom: 1px solid var(--color-border-light);
}

.finding:last-child {
    border-bottom: none;
}

.finding-icon {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    color: var(--color-accent);
    margin-top: 2px;
}

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

.finding strong {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.finding p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* ---- Charts ---- */
.chart-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.chart-card {
    background: #fff;
    border: 1px solid var(--color-border-light);
    border-radius: 6px;
    padding: 1.75rem;
}

.section-alt .chart-card {
    background: #fff;
}

.chart-title h3 {
    font-family: var(--font-serif);
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.chart-title p {
    font-size: 0.8rem;
    color: var(--color-text-light);
    margin-bottom: 1.25rem;
}

.chart-container {
    position: relative;
    height: 320px;
}

.chart-container-wide {
    height: 400px;
}

.chart-footnote {
    font-size: 0.75rem;
    color: var(--color-text-light);
    margin-top: 1rem;
    line-height: 1.6;
    border-top: 1px solid var(--color-border-light);
    padding-top: 0.75rem;
}

/* ---- Callout ---- */
.callout {
    display: flex;
    gap: 1.25rem;
    background: #fff;
    border: 1px solid var(--color-border-light);
    border-radius: 6px;
    padding: 1.5rem;
}

.callout-bar {
    width: 3px;
    flex-shrink: 0;
    background: var(--color-accent);
    border-radius: 2px;
}

.callout-bar-green {
    background: var(--color-positive);
}

.callout-bar-red {
    background: var(--color-critical);
}

.callout strong {
    display: block;
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
}

.callout p {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* ---- Mechanism Cards ---- */
.mechanism-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.mechanism-card {
    background: #fff;
    border: 1px solid var(--color-border-light);
    border-radius: 6px;
    padding: 2rem;
    transition: box-shadow 0.3s ease;
}

.mechanism-card:hover {
    box-shadow: 0 4px 20px rgba(0,0,0,0.06);
}

.mechanism-number {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-accent);
    opacity: 0.3;
    margin-bottom: 0.75rem;
}

.mechanism-card h3 {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.mechanism-card p {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    line-height: 1.7;
    margin-bottom: 1.25rem;
}

.mechanism-stat {
    padding-top: 1rem;
    border-top: 1px solid var(--color-border-light);
}

.mechanism-stat-value {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--color-accent);
    display: block;
}

.mechanism-stat-label {
    font-size: 0.75rem;
    color: var(--color-text-light);
}

/* ---- Region Cards ---- */
.region-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.region-card {
    background: #fff;
    border: 1px solid var(--color-border-light);
    border-radius: 6px;
    padding: 2rem;
}

.region-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.25rem;
}

.region-header h3 {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    font-weight: 600;
}

.region-tag {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    padding: 0.25rem 0.625rem;
    border-radius: 3px;
    font-weight: 500;
}

.region-tag.critical {
    background: var(--color-warning-bg);
    color: var(--color-warning);
}

.region-tag.moderate {
    background: var(--color-accent-subtle);
    color: var(--color-accent);
}

.region-tag.advanced {
    background: var(--color-positive-bg);
    color: var(--color-positive);
}

.region-stats {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1.25rem;
    padding-bottom: 1.25rem;
    border-bottom: 1px solid var(--color-border-light);
}

.region-stat-value {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--color-text);
    display: block;
}

.region-stat-label {
    font-size: 0.7rem;
    color: var(--color-text-light);
}

.region-card > p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    line-height: 1.7;
    margin-bottom: 1.25rem;
}

.region-progress {
    margin-top: auto;
}

.region-progress-label {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--color-text-light);
    margin-bottom: 0.5rem;
}

.region-progress-bar {
    height: 6px;
    background: var(--color-bg-alt);
    border-radius: 3px;
    overflow: hidden;
}

.region-progress-fill {
    height: 100%;
    width: var(--fill);
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light));
    border-radius: 3px;
    transition: width 1.5s ease;
}

/* ---- Evidence Table ---- */
.evidence-table-wrapper {
    overflow-x: auto;
    border: 1px solid var(--color-border-light);
    border-radius: 6px;
    background: #fff;
}

.evidence-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.evidence-table thead {
    background: var(--color-bg-alt);
}

.evidence-table th {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-text-light);
    padding: 0.875rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
    white-space: nowrap;
}

.evidence-table td {
    padding: 0.875rem 1rem;
    border-bottom: 1px solid var(--color-border-light);
    vertical-align: top;
}

.evidence-table tbody tr:last-child td {
    border-bottom: none;
}

.evidence-table tbody tr:hover {
    background: rgba(30, 58, 95, 0.02);
}

.table-cite {
    font-size: 0.75rem;
    color: var(--color-text-light);
}

.effect-positive {
    font-family: var(--font-mono);
    font-weight: 500;
    color: var(--color-positive);
}

.effect-null {
    font-family: var(--font-mono);
    font-weight: 500;
    color: var(--color-text-light);
}

/* ---- Policy ---- */
.policy-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.policy-card {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 6px;
    padding: 2rem;
}

.policy-icon {
    width: 48px;
    height: 48px;
    color: rgba(255,255,255,0.4);
    margin-bottom: 1rem;
}

.policy-card h3 {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    font-weight: 600;
    color: #fff;
    margin-bottom: 1.25rem;
}

.policy-actions {
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
}

.policy-action {
    font-size: 0.825rem;
    color: rgba(255,255,255,0.55);
    padding-left: 1rem;
    border-left: 2px solid rgba(255,255,255,0.1);
    line-height: 1.6;
}

/* ---- Closing ---- */
.closing-content {
    max-width: 780px;
    margin: 0 auto;
    text-align: center;
}

.closing-content blockquote {
    font-family: var(--font-serif);
    font-size: 1.35rem;
    font-weight: 400;
    font-style: italic;
    line-height: 1.6;
    color: var(--color-text);
    margin-bottom: 2.5rem;
    position: relative;
    padding: 0 1rem;
}

.closing-content blockquote::before {
    content: '\201C';
    position: absolute;
    left: -1.5rem;
    top: -0.5rem;
    font-size: 4rem;
    color: var(--color-accent);
    opacity: 0.15;
    font-family: var(--font-serif);
}

.closing-meta {
    text-align: left;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border-light);
}

.closing-meta > p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
}

.closing-sources h4 {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-light);
    margin-bottom: 0.75rem;
}

.source-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.source-grid span {
    font-size: 0.775rem;
    color: var(--color-text-muted);
    background: var(--color-bg-alt);
    padding: 0.375rem 0.75rem;
    border-radius: 3px;
    border: 1px solid var(--color-border-light);
}

/* ---- Footer ---- */
.footer {
    background: var(--color-bg-dark);
    padding: 1.5rem 0;
    border-top: 1px solid rgba(255,255,255,0.06);
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: rgba(255,255,255,0.4);
    font-size: 0.8rem;
}

.footer-logo {
    font-family: var(--font-mono);
    font-weight: 500;
    letter-spacing: 0.15em;
    color: rgba(255,255,255,0.6);
}

.footer-right {
    font-size: 0.75rem;
    color: rgba(255,255,255,0.3);
}

/* ---- Animations ---- */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ---- Responsive ---- */
@media (max-width: 968px) {
    :root {
        --section-padding: 3.5rem;
    }

    .nav-links {
        display: none;
    }

    .nav-hamburger {
        display: flex;
    }

    .grid-2,
    .chart-grid,
    .mechanism-grid,
    .region-grid,
    .policy-grid {
        grid-template-columns: 1fr;
    }

    .hero-stats {
        flex-direction: column;
        gap: 1.5rem;
        width: 100%;
    }

    .hero-stat-divider {
        width: 100%;
        height: 1px;
    }

    .hero h1 {
        font-size: 2.25rem;
    }
}

@media (max-width: 600px) {
    :root {
        --section-padding: 2.5rem;
    }

    .container {
        padding: 0 1.25rem;
    }

    .hero-content {
        padding: 3rem 1.25rem;
    }

    .hero-stats {
        padding: 1.5rem;
    }

    .hero-stat-value {
        font-size: 1.5rem;
    }

    .section h2 {
        font-size: 1.5rem;
    }

    .evidence-table {
        font-size: 0.75rem;
    }

    .evidence-table th,
    .evidence-table td {
        padding: 0.625rem 0.5rem;
    }

    .mechanism-card,
    .region-card,
    .policy-card,
    .chart-card {
        padding: 1.25rem;
    }

    .closing-content blockquote {
        font-size: 1.1rem;
    }
}