/* ==========================================================================
   Market Macrostructure Website Styles
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Variables & Reset
   -------------------------------------------------------------------------- */
:root {
    /* Colors */
    --color-primary: #4A90A4;
    --color-primary-dark: #3A7A8E;
    --color-secondary: #7FB069;
    --color-accent: #E07A5F;
    --color-purple: #9B5DE5;
    --color-orange: #F4A261;

    /* Neutrals */
    --color-text: #2D3748;
    --color-text-light: #4A5568;
    --color-text-muted: #718096;
    --color-bg: #FFFFFF;
    --color-bg-alt: #F7FAFC;
    --color-bg-dark: #1A202C;
    --color-border: #E2E8F0;

    /* Typography */
    --font-sans: 'Source Sans Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-serif: 'Source Serif Pro', Georgia, serif;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Layout */
    --container-max: 1200px;
    --container-narrow: 800px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px rgba(0,0,0,0.15);
}

/* Reset */
*, *::before, *::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
    margin: 0 0 var(--spacing-md) 0;
    font-weight: 600;
    line-height: 1.3;
}

p {
    margin: 0 0 var(--spacing-md) 0;
}

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

a:hover {
    color: var(--color-primary-dark);
}

ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

.section {
    padding: var(--spacing-3xl) 0;
}

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

.section-title {
    font-size: 2.25rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.section-intro {
    font-size: 1.125rem;
    text-align: center;
    max-width: var(--container-narrow);
    margin: 0 auto var(--spacing-2xl) auto;
    color: var(--color-text-light);
}

/* --------------------------------------------------------------------------
   Navigation
   -------------------------------------------------------------------------- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
}

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

.nav-logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
}

.nav-logo:hover {
    color: var(--color-primary);
}

.nav-menu {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-menu a {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-light);
    transition: color var(--transition-fast);
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--color-primary);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: var(--transition-base);
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    min-height: 100vh;
    padding: calc(80px + var(--spacing-3xl)) var(--spacing-xl) var(--spacing-3xl);
    max-width: var(--container-max);
    margin: 0 auto;
}

.hero-content {
    max-width: 560px;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-purple) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
    line-height: 1.3;
}

.hero-description {
    font-size: 1.0625rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-diagram {
    width: 100%;
    max-width: 500px;
    height: auto;
}

.hero-diagram .node circle {
    transition: transform var(--transition-base);
}

.hero-diagram .node:hover circle {
    transform: scale(1.05);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
    font-weight: 600;
    border-radius: 8px;
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--color-primary);
    color: white;
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: white;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-secondary:hover {
    background: var(--color-primary);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* --------------------------------------------------------------------------
   Pillars Grid (Overview Section)
   -------------------------------------------------------------------------- */
.pillars-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.pillar-card {
    background: white;
    border-radius: 12px;
    padding: var(--spacing-xl);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.pillar-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.pillar-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-lg);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.pillar-icon.who {
    background: #E8F4F8;
    color: var(--color-primary);
}

.pillar-icon.how {
    background: #E8F8E8;
    color: var(--color-secondary);
}

.pillar-icon.what {
    background: #FFE8E5;
    color: var(--color-accent);
}

.pillar-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.pillar-card p {
    color: var(--color-text-light);
    margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   Philosophy Quote
   -------------------------------------------------------------------------- */
.philosophy-quote {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.philosophy-quote blockquote {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-style: italic;
    color: var(--color-primary-dark);
    margin: 0 0 var(--spacing-md) 0;
    padding: var(--spacing-xl);
    border-left: 4px solid var(--color-primary);
    background: var(--color-bg-alt);
    border-radius: 0 12px 12px 0;
}

.quote-caption {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   Key Insight Section
   -------------------------------------------------------------------------- */
.insight-grid {
    margin-bottom: var(--spacing-2xl);
}

.insight-comparison {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.comparison-card {
    background: white;
    border-radius: 12px;
    padding: var(--spacing-xl);
    max-width: 320px;
    box-shadow: var(--shadow-md);
}

.comparison-card h4 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-muted);
}

.comparison-card.macrostructure h4 {
    color: var(--color-primary);
}

.comparison-equation {
    font-family: 'Georgia', serif;
    font-size: 1rem;
    background: var(--color-bg-alt);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 6px;
    margin-bottom: var(--spacing-md);
}

.comparison-equation .highlight {
    color: var(--color-accent);
    font-weight: 600;
}

.comparison-arrow {
    color: var(--color-text-muted);
}

/* When Does It Matter? */
.when-it-matters {
    margin-top: var(--spacing-2xl);
}

.when-it-matters h3 {
    text-align: center;
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xl);
}

.conditions-grid {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.condition-card {
    background: white;
    border-radius: 12px;
    padding: var(--spacing-xl);
    max-width: 260px;
    box-shadow: var(--shadow-md);
    text-align: center;
}

.condition-number {
    width: 40px;
    height: 40px;
    margin: 0 auto var(--spacing-md);
    border-radius: 50%;
    background: var(--color-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
}

.condition-card h4 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
}

.condition-card p {
    font-size: 0.9375rem;
    color: var(--color-text-light);
    margin-bottom: 0;
}

.condition-plus,
.condition-equals {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-text-muted);
}

.condition-result {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-purple) 100%);
    border-radius: 12px;
    padding: var(--spacing-lg) var(--spacing-xl);
    max-width: 260px;
}

.condition-result p {
    color: white;
    font-weight: 700;
    font-size: 1.125rem;
    margin-bottom: 0;
    text-align: center;
}

/* --------------------------------------------------------------------------
   Applications / Three Forces Section
   -------------------------------------------------------------------------- */
.applications-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.application-card {
    background: white;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.application-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.app-header {
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.app-header.intermediaries {
    background: linear-gradient(135deg, #FFE5E5 0%, #FFF0ED 100%);
}

.app-header.intermediaries .app-icon {
    color: var(--color-accent);
}

.app-header.passive {
    background: linear-gradient(135deg, #E8F8E8 0%, #F0FFF0 100%);
}

.app-header.passive .app-icon {
    color: var(--color-secondary);
}

.app-header.central-banks {
    background: linear-gradient(135deg, #F0E8FF 0%, #F8F0FF 100%);
}

.app-header.central-banks .app-icon {
    color: var(--color-purple);
}

.app-header h3 {
    font-size: 1.125rem;
    margin-bottom: 0;
}

.app-content {
    padding: var(--spacing-lg);
}

/* Stat callout in application cards */
.app-stat {
    background: var(--color-bg-alt);
    border-radius: 8px;
    padding: var(--spacing-md) var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: baseline;
    gap: var(--spacing-sm);
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-light);
    line-height: 1.4;
}

.app-description {
    font-size: 0.9375rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
}

.app-visual {
    background: var(--color-bg-alt);
    border-radius: 8px;
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.app-diagram {
    width: 100%;
    height: auto;
    display: block;
}

.app-papers h5 {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-sm);
}

.app-papers ul {
    font-size: 0.8125rem;
}

.app-papers li {
    padding: var(--spacing-xs) 0;
    color: var(--color-text-light);
    border-bottom: 1px solid var(--color-border);
    line-height: 1.5;
}

.app-papers li:last-child {
    border-bottom: none;
}

/* --------------------------------------------------------------------------
   Playbook Section
   -------------------------------------------------------------------------- */
.playbook-steps {
    margin-bottom: var(--spacing-2xl);
}

.playbook-recipe {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-xl);
}

.recipe-step {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    background: white;
    border-radius: 12px;
    padding: var(--spacing-lg) var(--spacing-xl);
    box-shadow: var(--shadow-md);
    max-width: 280px;
}

.recipe-number {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--color-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1rem;
    flex-shrink: 0;
}

.recipe-text {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text);
}

.recipe-arrow {
    font-size: 1.5rem;
    color: var(--color-text-muted);
}

.methods-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.method-card {
    background: white;
    border-radius: 16px;
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.method-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.method-icon {
    width: 64px;
    height: 64px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.method-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.method-card p {
    font-size: 0.9375rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
}

.method-examples {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.method-examples span {
    font-size: 0.75rem;
    background: var(--color-bg-alt);
    color: var(--color-text-muted);
    padding: 2px 8px;
    border-radius: 4px;
}

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

.playbook-cta p {
    font-size: 1.125rem;
    color: var(--color-text-light);
}

.playbook-cta strong {
    color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   Open Questions Section
   -------------------------------------------------------------------------- */
.questions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.question-card {
    background: white;
    border-radius: 16px;
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.question-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.question-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
}

.question-card h3 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.question-card p {
    font-size: 0.9375rem;
    color: var(--color-text-light);
    margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   Papers Section
   -------------------------------------------------------------------------- */
.papers-container {
    display: grid;
    gap: var(--spacing-2xl);
}

.paper-category {
    background: white;
    border-radius: 16px;
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
}

.category-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.category-description {
    color: #666;
    font-size: 0.95rem;
    margin-bottom: var(--spacing-lg);
    padding-left: 2rem;
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-border);
}

.category-icon {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.category-icon.foundational { background: var(--color-primary); }
.category-icon.intermediaries { background: var(--color-accent); }
.category-icon.passive { background: var(--color-secondary); }
.category-icon.central-banks { background: var(--color-purple); }
.category-icon.demand { background: var(--color-orange); }
.category-icon.related { background: #264653; }

.paper-list {
    display: grid;
    gap: var(--spacing-md);
}

.paper-item {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--spacing-lg);
    padding: var(--spacing-md);
    border-radius: 8px;
    transition: background var(--transition-fast);
}

.paper-item:hover {
    background: var(--color-bg-alt);
}

.paper-info h4 {
    font-size: 1rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
}

.paper-info h4 a {
    color: var(--color-text);
}

.paper-info h4 a:hover {
    color: var(--color-primary);
}

.paper-authors {
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xs) !important;
}

.paper-venue {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    font-style: italic;
    margin-bottom: 0 !important;
}

.paper-tags {
    display: flex;
    gap: var(--spacing-xs);
    flex-shrink: 0;
}

.tag {
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 4px;
}

.tag.survey {
    background: #E8F4F8;
    color: var(--color-primary);
}

.tag.start-here {
    background: #E8F8E8;
    color: var(--color-secondary);
}

.tag.theory {
    background: #F0E8FF;
    color: var(--color-purple);
}

.tag.empirical {
    background: #FFF3E8;
    color: var(--color-orange);
}

/* --------------------------------------------------------------------------
   Talk Section
   -------------------------------------------------------------------------- */
.talk-content {
    max-width: var(--container-narrow);
    margin: 0 auto;
}

.talk-card {
    background: white;
    border-radius: 16px;
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-md);
    text-align: center;
}

.talk-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.talk-meta {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-lg) !important;
}

.talk-card > p {
    font-size: 0.9375rem;
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto var(--spacing-lg) auto;
}

.talk-links {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
}

/* --------------------------------------------------------------------------
   About Section
   -------------------------------------------------------------------------- */
.about-content {
    max-width: var(--container-narrow);
    margin: 0 auto;
}

.about-content > p {
    font-size: 1.0625rem;
    color: var(--color-text-light);
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.authors-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
}

.author-card {
    background: var(--color-bg-alt);
    border-radius: 12px;
    padding: var(--spacing-xl);
    text-align: center;
}

.author-card h4 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
}

.author-title {
    font-size: 0.9375rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xs) !important;
}

.author-affiliation {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xs) !important;
}

.author-card a {
    font-size: 0.875rem;
    font-weight: 600;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
    background: var(--color-bg-dark);
    color: white;
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.footer p {
    font-size: 0.875rem;
    color: rgba(255,255,255,0.6);
    margin-bottom: 0;
}

.footer a {
    color: rgba(255,255,255,0.8);
}

.footer a:hover {
    color: white;
}

/* --------------------------------------------------------------------------
   Responsive Design
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
        min-height: auto;
        padding-top: calc(80px + var(--spacing-2xl));
    }

    .hero-content {
        max-width: 100%;
    }

    .hero-buttons {
        justify-content: center;
    }

    .btn {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: 0.9rem;
    }

    .hero-visual {
        order: -1;
    }

    .hero-diagram {
        max-width: 400px;
    }

    .pillars-grid,
    .methods-grid,
    .applications-grid,
    .questions-grid {
        grid-template-columns: 1fr;
    }

    .insight-comparison,
    .conditions-grid {
        flex-direction: column;
    }

    .comparison-card,
    .condition-card {
        max-width: 100%;
        width: 100%;
    }

    .comparison-arrow {
        transform: rotate(90deg);
    }

    .playbook-recipe {
        flex-direction: column;
    }

    .recipe-arrow {
        transform: rotate(90deg);
    }

    .recipe-step {
        max-width: 100%;
        width: 100%;
    }

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

@media (max-width: 768px) {
    :root {
        --spacing-3xl: 3rem;
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-lg);
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.25rem;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .philosophy-quote blockquote {
        font-size: 1.25rem;
        padding: var(--spacing-lg);
    }

    .paper-item {
        flex-direction: column;
    }

    .paper-tags {
        margin-top: var(--spacing-sm);
    }

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

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    .hero h1 {
        font-size: 2rem;
    }

    .pillar-card,
    .method-card,
    .paper-category,
    .question-card {
        padding: var(--spacing-lg);
    }

    .condition-plus,
    .condition-equals {
        font-size: 1.5rem;
    }
}

/* --------------------------------------------------------------------------
   Animations
   -------------------------------------------------------------------------- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-content,
.hero-visual {
    animation: fadeInUp 0.6s ease-out forwards;
}

.hero-visual {
    animation-delay: 0.2s;
}

/* Intersection Observer animations */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease-out;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --------------------------------------------------------------------------
   Data/Charts Section
   -------------------------------------------------------------------------- */
.charts-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.chart-container {
    background: white;
    border-radius: 12px;
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    min-height: 400px;
}

.chart {
    width: 100%;
    height: 380px;
}

.data-notes {
    background: white;
    border-radius: 12px;
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
}

.data-notes h4 {
    font-size: 1.125rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.data-notes ul {
    list-style: disc;
    padding-left: var(--spacing-xl);
}

.data-notes li {
    font-size: 0.9375rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
    line-height: 1.5;
}

.data-notes li strong {
    color: var(--color-text);
}

@media (max-width: 1024px) {
    .charts-grid {
        grid-template-columns: 1fr;
    }

    .chart-container {
        min-height: 350px;
    }

    .chart {
        height: 330px;
    }
}

@media (max-width: 480px) {
    .chart-container {
        padding: var(--spacing-md);
        min-height: 300px;
    }

    .chart {
        height: 280px;
    }
}