/* ===================================
   CSS Variables & Base Styles
   =================================== */

:root {
    /* Color Palette - Deep teal & warm gold accent */
    --color-bg: #0a1a1f;
    --color-bg-elevated: #0f2329;
    --color-bg-card: #122a32;
    --color-text: #e8f0f2;
    --color-text-muted: #8ba3ab;
    --color-text-subtle: #5a7580;
    --color-accent: #d4a853;
    --color-accent-light: #e8c778;
    --color-accent-dim: rgba(212, 168, 83, 0.15);
    --color-border: rgba(139, 163, 171, 0.12);
    --color-border-accent: rgba(212, 168, 83, 0.3);
    
    /* Typography */
    --font-serif: 'Instrument Serif', Georgia, serif;
    --font-sans: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;
    
    /* 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 {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

/* Noise texture overlay */
.noise-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

/* ===================================
   Typography
   =================================== */

h1, h2, h3, h4 {
    font-family: var(--font-serif);
    font-weight: 400;
    line-height: 1.2;
}

h1 {
    font-size: clamp(3rem, 8vw, 6rem);
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    letter-spacing: -0.01em;
}

h3 {
    font-size: clamp(1.25rem, 2vw, 1.5rem);
}

p {
    max-width: 65ch;
}

.lead {
    font-size: 1.25rem;
    color: var(--color-text);
    line-height: 1.8;
}

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

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

em {
    font-style: italic;
    color: var(--color-accent);
}

strong {
    font-weight: 600;
}

/* ===================================
   Layout
   =================================== */

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.section {
    padding: var(--space-2xl) 0;
}

.section-header {
    margin-bottom: var(--space-xl);
}

.section-number {
    display: block;
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-accent);
    letter-spacing: 0.1em;
    margin-bottom: var(--space-sm);
}

.section-intro {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    max-width: 70ch;
    margin-bottom: var(--space-xl);
}

/* ===================================
   Navigation
   =================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--space-md) 0;
    background: linear-gradient(to bottom, var(--color-bg), transparent);
    transition: background var(--transition-base);
}

.navbar.scrolled {
    background: rgba(10, 26, 31, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--color-text);
    font-family: var(--font-serif);
    font-size: 1.125rem;
}

.logo-icon {
    color: var(--color-accent);
    font-size: 1.5rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.nav-links a {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    transition: color var(--transition-fast);
}

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

.nav-cta {
    padding: 0.6rem 1.2rem;
    background: var(--color-accent-dim);
    border: 1px solid var(--color-border-accent);
    border-radius: 6px;
    color: var(--color-accent) !important;
}

.nav-cta:hover {
    background: rgba(212, 168, 83, 0.25);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: var(--transition-fast);
}

/* ===================================
   Hero Section
   =================================== */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: var(--space-2xl) var(--space-md);
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(212, 168, 83, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(212, 168, 83, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 80% 70% at 50% 50%, black, transparent);
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 30%, rgba(212, 168, 83, 0.08), transparent 50%),
                radial-gradient(circle at 70% 70%, rgba(18, 42, 50, 0.5), transparent 50%);
    animation: heroGlow 20s ease-in-out infinite alternate;
}

@keyframes heroGlow {
    0% { transform: translate(0, 0); }
    100% { transform: translate(-5%, -5%); }
}

.hero-content {
    position: relative;
    text-align: center;
    max-width: 1000px;
}

.hero-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--color-accent-dim);
    border: 1px solid var(--color-border-accent);
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-accent);
    letter-spacing: 0.05em;
    margin-bottom: var(--space-lg);
    animation: fadeInUp 0.8s ease-out;
}

.hero h1 {
    margin-bottom: var(--space-md);
    animation: fadeInUp 0.8s ease-out 0.1s both;
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2vw, 1.375rem);
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto var(--space-xl);
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
    max-width: 800px;
    margin: 0 auto var(--space-xl);
    animation: fadeInUp 0.8s ease-out 0.3s both;
}

.stat {
    padding: var(--space-md);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: 12px;
}

.stat-number {
    display: block;
    font-family: var(--font-serif);
    font-size: clamp(2rem, 4vw, 2.5rem);
    color: var(--color-accent);
    margin-bottom: var(--space-xs);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    line-height: 1.4;
}

.scroll-indicator {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    color: var(--color-text-muted);
    font-size: 0.85rem;
    animation: fadeInUp 0.8s ease-out 0.4s both, bounce 2s ease-in-out infinite 1.2s;
}

.scroll-indicator svg {
    opacity: 0.6;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(8px); }
}

/* ===================================
   Overview Section
   =================================== */

.section-overview {
    background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-elevated) 100%);
}

.overview-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
    align-items: center;
}

.overview-text p {
    margin-bottom: var(--space-md);
    color: var(--color-text-muted);
}

.overview-text p.lead {
    color: var(--color-text);
}

/* Diffusion Diagram */
.overview-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.diffusion-diagram {
    position: relative;
    width: 400px;
    height: 400px;
}

.core-city {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80px;
    height: 80px;
    background: var(--color-accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 4;
    box-shadow: 0 0 40px rgba(212, 168, 83, 0.4);
}

.core-city span {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--color-bg);
    text-align: center;
}

.diffusion-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    border-radius: 50%;
    border: 1px dashed;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 8px;
}

.diffusion-ring span {
    font-size: 0.65rem;
    color: var(--color-text-muted);
    background: var(--color-bg-elevated);
    padding: 2px 8px;
    border-radius: 4px;
}

.ring-1 {
    width: 160px;
    height: 160px;
    margin-left: -80px;
    margin-top: -80px;
    border-color: rgba(212, 168, 83, 0.4);
    animation: pulse 4s ease-in-out infinite;
}

.ring-2 {
    width: 260px;
    height: 260px;
    margin-left: -130px;
    margin-top: -130px;
    border-color: rgba(212, 168, 83, 0.25);
    animation: pulse 4s ease-in-out infinite 0.5s;
}

.ring-3 {
    width: 360px;
    height: 360px;
    margin-left: -180px;
    margin-top: -180px;
    border-color: rgba(212, 168, 83, 0.12);
    animation: pulse 4s ease-in-out infinite 1s;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: translate(-50%, -50%) scale(1); }
    50% { opacity: 0.6; transform: translate(-50%, -50%) scale(1.02); }
}

.diffusion-arrows {
    position: absolute;
    inset: 0;
}

.arrow {
    position: absolute;
    width: 60px;
    height: 2px;
    background: linear-gradient(90deg, var(--color-accent), transparent);
}

.arrow-1 { top: 50%; left: 55%; transform: rotate(0deg); }
.arrow-2 { top: 30%; left: 55%; transform: rotate(-45deg); }
.arrow-3 { top: 70%; left: 55%; transform: rotate(45deg); }
.arrow-4 { top: 50%; right: 55%; transform: rotate(180deg); }

/* ===================================
   Mechanisms Section
   =================================== */

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

.mechanisms-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.mechanism-card {
    padding: var(--space-lg);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    transition: transform var(--transition-base), border-color var(--transition-base);
}

.mechanism-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-border-accent);
}

.mechanism-icon {
    width: 48px;
    height: 48px;
    margin-bottom: var(--space-md);
}

.mechanism-icon svg {
    width: 100%;
    height: 100%;
    stroke: var(--color-accent);
}

.mechanism-card h3 {
    margin-bottom: var(--space-sm);
    color: var(--color-text);
}

.mechanism-card p {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
}

.mechanism-points {
    list-style: none;
}

.mechanism-points li {
    position: relative;
    padding-left: var(--space-md);
    font-size: 0.85rem;
    color: var(--color-text-subtle);
    margin-bottom: var(--space-xs);
}

.mechanism-points li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-accent);
}

/* ===================================
   Quote Section
   =================================== */

.section-quote {
    background: var(--color-bg);
    padding: var(--space-2xl) 0;
}

.section-quote blockquote {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.section-quote p {
    font-family: var(--font-serif);
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-style: italic;
    color: var(--color-text);
    line-height: 1.5;
    max-width: none;
}

.section-quote cite {
    display: block;
    margin-top: var(--space-md);
    font-size: 1rem;
    font-style: normal;
    color: var(--color-text-muted);
}

/* ===================================
   Cities Section
   =================================== */

.section-cities {
    background: linear-gradient(180deg, var(--color-bg-elevated) 0%, var(--color-bg) 100%);
}

.cities-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
}

.city-card {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    overflow: hidden;
    transition: transform var(--transition-base), border-color var(--transition-base);
}

.city-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-border-accent);
}

.city-image {
    min-height: 280px;
    background-size: cover;
    background-position: center;
    position: relative;
}

.city-image::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent 50%, rgba(10, 26, 31, 0.8));
}

.city-shenzhen .city-image {
    background: linear-gradient(135deg, #1a3a4a, #0d1f28);
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23d4a853' fill-opacity='0.08'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.city-bangalore .city-image {
    background: linear-gradient(135deg, #2a1a3a, #1a0d28);
    background-image: url("data:image/svg+xml,%3Csvg width='20' height='20' viewBox='0 0 20 20' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%23d4a853' fill-opacity='0.08' fill-rule='evenodd'%3E%3Ccircle cx='3' cy='3' r='3'/%3E%3Ccircle cx='13' cy='13' r='3'/%3E%3C/g%3E%3C/svg%3E");
}

.city-lagos .city-image {
    background: linear-gradient(135deg, #3a2a1a, #281a0d);
    background-image: url("data:image/svg+xml,%3Csvg width='40' height='40' viewBox='0 0 40 40' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%23d4a853' fill-opacity='0.08' fill-rule='evenodd'%3E%3Cpath d='M0 40L40 0H20L0 20M40 40V20L20 40'/%3E%3C/g%3E%3C/svg%3E");
}

.city-nairobi .city-image {
    background: linear-gradient(135deg, #1a3a2a, #0d281a);
    background-image: url("data:image/svg+xml,%3Csvg width='52' height='26' viewBox='0 0 52 26' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23d4a853' fill-opacity='0.08'%3E%3Cpath d='M10 10c0-2.21-1.79-4-4-4-3.314 0-6-2.686-6-6h2c0 2.21 1.79 4 4 4 3.314 0 6 2.686 6 6 0 2.21 1.79 4 4 4 3.314 0 6 2.686 6 6 0 2.21 1.79 4 4 4v2c-3.314 0-6-2.686-6-6 0-2.21-1.79-4-4-4-3.314 0-6-2.686-6-6zm25.464-1.95l8.486 8.486-1.414 1.414-8.486-8.486 1.414-1.414z' /%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.city-content {
    padding: var(--space-lg);
    display: flex;
    flex-direction: column;
}

.city-meta {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
}

.city-region,
.city-growth {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
}

.city-region {
    background: var(--color-accent-dim);
    color: var(--color-accent);
}

.city-growth {
    background: rgba(139, 163, 171, 0.1);
    color: var(--color-text-muted);
}

.city-card h3 {
    margin-bottom: var(--space-sm);
    color: var(--color-text);
}

.city-card > .city-content > p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    flex-grow: 1;
}

.city-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-sm);
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border);
}

.city-stat .value {
    display: block;
    font-family: var(--font-serif);
    font-size: 1.1rem;
    color: var(--color-accent);
}

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

/* ===================================
   Poverty Section
   =================================== */

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

.poverty-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
    align-items: start;
}

.poverty-text p {
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
}

.poverty-mechanism {
    margin-top: var(--space-lg);
    padding: var(--space-md);
    background: var(--color-bg-elevated);
    border-left: 3px solid var(--color-accent);
    border-radius: 0 8px 8px 0;
}

.poverty-mechanism h4 {
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-accent);
    margin-bottom: var(--space-xs);
}

.poverty-mechanism p {
    font-size: 0.9rem;
    margin-bottom: 0;
}

/* Bar Chart */
.poverty-chart {
    background: var(--color-bg-elevated);
    padding: var(--space-lg);
    border-radius: 16px;
    border: 1px solid var(--color-border);
}

.poverty-chart h4 {
    font-family: var(--font-sans);
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.chart-subtitle {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-lg);
}

.bar-chart {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.bar-row {
    display: grid;
    grid-template-columns: 60px 1fr;
    align-items: center;
    gap: var(--space-sm);
}

.bar-label {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    text-align: right;
}

.bar-container {
    background: rgba(139, 163, 171, 0.1);
    border-radius: 4px;
    height: 32px;
    overflow: hidden;
}

.bar {
    height: 100%;
    width: var(--width);
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light));
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: var(--space-sm);
    animation: barGrow 1s ease-out;
    animation-fill-mode: backwards;
}

.bar-row:nth-child(1) .bar { animation-delay: 0.1s; }
.bar-row:nth-child(2) .bar { animation-delay: 0.2s; }
.bar-row:nth-child(3) .bar { animation-delay: 0.3s; }
.bar-row:nth-child(4) .bar { animation-delay: 0.4s; }
.bar-row:nth-child(5) .bar { animation-delay: 0.5s; }

@keyframes barGrow {
    from { width: 0; }
}

.bar-value {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-bg);
}

.chart-note {
    font-size: 0.75rem;
    color: var(--color-text-subtle);
    margin-top: var(--space-md);
    font-style: italic;
}

/* ===================================
   Research Section
   =================================== */

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

.research-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

.research-category h4 {
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-accent);
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--color-border);
}

.research-list {
    list-style: none;
}

.research-list li {
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--color-border);
}

.research-list li:last-child {
    border-bottom: none;
}

.research-author {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text);
}

.research-title {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    font-style: italic;
}

/* ===================================
   CTA Section
   =================================== */

.section-cta {
    background: linear-gradient(180deg, var(--color-bg-elevated) 0%, var(--color-bg) 100%);
    padding: var(--space-2xl) 0;
}

.cta-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.cta-content h2 {
    margin-bottom: var(--space-md);
}

.cta-content p {
    color: var(--color-text-muted);
    margin: 0 auto var(--space-lg);
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 1rem 2rem;
    background: var(--color-accent);
    color: var(--color-bg) !important;
    font-weight: 600;
    border-radius: 8px;
    transition: transform var(--transition-fast), background var(--transition-fast);
}

.cta-button:hover {
    background: var(--color-accent-light);
    transform: translateY(-2px);
}

.cta-button svg {
    transition: transform var(--transition-fast);
}

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

/* ===================================
   Footer
   =================================== */

.footer {
    background: var(--color-bg);
    padding: var(--space-lg) 0;
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-family: var(--font-serif);
    color: var(--color-text);
}

.footer-links {
    display: flex;
    gap: var(--space-lg);
}

.footer-links a {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.footer-copyright {
    width: 100%;
    text-align: center;
    font-size: 0.85rem;
    color: var(--color-text-subtle);
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border);
}

/* ===================================
   Responsive Design
   =================================== */

@media (max-width: 1024px) {
    .mechanisms-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .cities-grid {
        grid-template-columns: 1fr;
    }
    
    .city-card {
        grid-template-columns: 1fr 2fr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
        gap: var(--space-sm);
    }
    
    .overview-grid,
    .poverty-content {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
    
    .overview-visual {
        order: -1;
    }
    
    .diffusion-diagram {
        width: 300px;
        height: 300px;
    }
    
    .ring-1 { width: 120px; height: 120px; margin-left: -60px; margin-top: -60px; }
    .ring-2 { width: 200px; height: 200px; margin-left: -100px; margin-top: -100px; }
    .ring-3 { width: 280px; height: 280px; margin-left: -140px; margin-top: -140px; }
    
    .mechanisms-grid,
    .research-grid {
        grid-template-columns: 1fr;
    }
    
    .city-card {
        grid-template-columns: 1fr;
    }
    
    .city-image {
        min-height: 160px;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    :root {
        --space-lg: 2rem;
        --space-xl: 3rem;
        --space-2xl: 4rem;
    }
    
    .hero {
        padding-top: 100px;
    }
    
    .section-quote p {
        font-size: 1.25rem;
    }
}