/**
 * Saphiar - Main Stylesheet
 * Dark theme, mobile-first responsive design
 */

/* CSS Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Dark Theme Colors */
    --primary-bg: #0a0a0a;
    --secondary-bg: #111111;
    --tertiary-bg: #1a1a1a;
    --accent-bg: #222222;
    
    --primary-text: #ffffff;
    --secondary-text: #cccccc;
    --muted-text: #888888;
    
    --accent-color: #00d4ff;
    --accent-hover: #00b8e6;
    --success-color: #00ff88;
    --warning-color: #ffaa00;
    --error-color: #ff4444;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    /* 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-width: 1200px;
    --border-radius: 8px;
    --border-radius-lg: 12px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.6);
}

/* Base Styles */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--primary-text);
    background-color: var(--primary-bg);
    overflow-x: hidden;
}

body.menu-open {
    overflow: hidden;
}

/* Container */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
    margin-bottom: var(--spacing-md);
    color: var(--secondary-text);
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--accent-bg);
    z-index: 1000;
    padding: var(--spacing-md) 0;
}

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

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    color: var(--primary-text);
}

.logo-img {
    width: 144px;
    height: 144px;
}

.logo-text {
    display: none;
}

.nav-toggle {
    display: block;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
    z-index: 1001;
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--primary-text);
    position: relative;
    transition: all 0.3s ease;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: var(--primary-text);
    transition: all 0.3s ease;
    left: 0;
}

.hamburger::before {
    top: -8px;
}

.hamburger::after {
    top: 8px;
}

.nav-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--secondary-bg);
    padding: var(--spacing-md);
    border: 1px solid var(--accent-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.2s ease;
    z-index: 1000;
    min-width: 200px;
    max-width: calc(100vw - 2rem);
}

.nav-menu.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav-list {
    display: flex;
    flex-direction: column;
    list-style: none;
    gap: var(--spacing-xs);
    padding: 0;
    margin: 0;
}

.nav-link {
    color: var(--secondary-text);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    display: block;
    white-space: nowrap;
}

.nav-item {
    display: block;
}

.nav-link:hover,
.nav-link.active {
    color: var(--accent-color);
    background: var(--accent-bg);
}

/* Main Content */
.main-content {
    margin-top: 200px;
}

/* Hero Section */
.hero {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, var(--primary-bg) 0%, var(--secondary-bg) 100%);
    position: relative;
    overflow: hidden;
}

.hero-content {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    text-align: center;
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    line-height: 1.1;
}

.hero-paper-heading {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--secondary-text);
    max-width: 900px;
    margin: 0 auto var(--spacing-lg);
    line-height: 1.35;
}

.highlight {
    color: var(--accent-color);
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--secondary-text);
    margin-bottom: var(--spacing-2xl);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.hero-visual {
    margin-top: var(--spacing-3xl);
    display: flex;
    justify-content: center;
}

.network-visualization {
    width: 100%;
    max-width: 600px;
    height: 300px;
    background: var(--tertiary-bg);
    border-radius: var(--border-radius-lg);
    position: relative;
    overflow: hidden;
}

.node-grid {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80%;
    height: 80%;
    background-image: 
        radial-gradient(circle at 20% 20%, var(--accent-color) 1px, transparent 1px),
        radial-gradient(circle at 80% 20%, var(--accent-color) 1px, transparent 1px),
        radial-gradient(circle at 20% 80%, var(--accent-color) 1px, transparent 1px),
        radial-gradient(circle at 80% 80%, var(--accent-color) 1px, transparent 1px),
        radial-gradient(circle at 50% 50%, var(--accent-color) 2px, transparent 2px);
    background-size: 100px 100px;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

/* Buttons */
.btn {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    font-size: var(--font-size-base);
    transition: all 0.3s ease;
    border: 2px solid transparent;
    cursor: pointer;
}

.btn-primary {
    background: var(--accent-color);
    color: var(--primary-bg);
    border-color: var(--accent-color);
}

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

.btn-secondary {
    background: var(--tertiary-bg);
    color: var(--primary-text);
    border-color: var(--accent-bg);
}

.btn-secondary:hover {
    background: var(--accent-bg);
    border-color: var(--accent-color);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--accent-color);
    border-color: var(--accent-color);
}

.btn-outline:hover {
    background: var(--accent-color);
    color: var(--primary-bg);
    transform: translateY(-2px);
}

/* Stats Section */
.stats-section {
    padding: var(--spacing-3xl) 0;
    background: var(--secondary-bg);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.stat-item {
    text-align: center;
    padding: var(--spacing-xl);
    background: var(--tertiary-bg);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--accent-bg);
}

.stat-number {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: var(--spacing-sm);
}

.stat-label {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--primary-text);
    margin-bottom: var(--spacing-xs);
}

.stat-description {
    font-size: var(--font-size-sm);
    color: var(--muted-text);
}

/* Section Styles */
.section-title {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
    color: var(--primary-text);
}

.dual-purpose {
    padding: var(--spacing-3xl) 0;
    background: var(--primary-bg);
}

.purpose-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-2xl);
}

.purpose-card {
    background: var(--tertiary-bg);
    padding: var(--spacing-2xl);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--accent-bg);
    text-align: center;
}

.card-icon {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-lg);
}

.purpose-card h3 {
    color: var(--accent-color);
    margin-bottom: var(--spacing-md);
}

.purpose-card ul {
    list-style: none;
    text-align: left;
    margin-top: var(--spacing-lg);
}

.purpose-card li {
    padding: var(--spacing-xs) 0;
    color: var(--secondary-text);
    position: relative;
    padding-left: var(--spacing-lg);
}

.purpose-card li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

.technology {
    padding: var(--spacing-3xl) 0;
    background: var(--secondary-bg);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    justify-items: center;
}

.tech-item {
    background: var(--tertiary-bg);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--accent-bg);
}

.tech-item h4 {
    color: var(--accent-color);
    margin-bottom: var(--spacing-md);
}

.market-opportunity {
    padding: var(--spacing-3xl) 0;
    background: var(--primary-bg);
}

.market-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
}

.market-item {
    text-align: center;
    padding: var(--spacing-xl);
    background: var(--tertiary-bg);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--accent-bg);
}

.market-value {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--success-color);
    margin-bottom: var(--spacing-sm);
}

.market-label {
    font-size: var(--font-size-base);
    color: var(--secondary-text);
}

.cta-section {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, var(--secondary-bg) 0%, var(--tertiary-bg) 100%);
    text-align: center;
}

.cta-section h2 {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-lg);
    color: var(--primary-text);
}

.cta-section p {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-2xl);
    color: var(--secondary-text);
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* Footer */
.footer {
    background: var(--secondary-bg);
    border-top: 1px solid var(--accent-bg);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.footer-logo {
    width: 120px;
    height: 120px;
}

.footer-tagline {
    color: var(--secondary-text);
    font-size: var(--font-size-sm);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-xl);
}

.footer-column h4 {
    color: var(--primary-text);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-base);
}

.footer-column ul {
    list-style: none;
}

.footer-column li {
    margin-bottom: var(--spacing-xs);
}

.footer-column a {
    color: var(--secondary-text);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: color 0.3s ease;
}

.footer-column a:hover {
    color: var(--accent-color);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--accent-bg);
    font-size: var(--font-size-sm);
    color: var(--muted-text);
}

.footer-legal {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-legal a {
    color: var(--muted-text);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-legal a:hover {
    color: var(--accent-color);
}

/* Additional Page Styles */
.market-overview, .financial-projections, .revenue-streams, .competitive-advantages, .investment-tiers, .risk-mitigation,
.security-benefits, .use-cases, .technology-features, .compliance-security, .cost-benefits, .implementation-timeline,
.isp-benefits, .network-capabilities, .service-offerings, .revenue-opportunities, .technical-specs, .partnership-model,
.scientific-mission, .scientific-capabilities, .research-applications, .cern-comparison, .open-science, .scientific-impact, .unification-theory {
    padding: var(--spacing-3xl) 0;
}

.market-overview, .financial-projections, .revenue-streams, .competitive-advantages, .investment-tiers, .risk-mitigation {
    background: var(--secondary-bg);
}

.security-benefits, .use-cases, .technology-features, .compliance-security, .cost-benefits, .implementation-timeline {
    background: var(--primary-bg);
}

.isp-benefits, .network-capabilities, .service-offerings, .revenue-opportunities, .technical-specs, .partnership-model {
    background: var(--secondary-bg);
}

.scientific-mission, .scientific-capabilities, .research-applications, .cern-comparison, .open-science, .scientific-impact, .unification-theory {
    background: var(--primary-bg);
}

/* Market Cards */
.market-grid, .projections-grid, .revenue-grid, .advantages-grid, .tiers-grid, .risk-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.market-card, .projection-card, .revenue-item, .advantage-item, .tier-card, .risk-item {
    background: var(--tertiary-bg);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--accent-bg);
    text-align: center;
}

.market-icon, .advantage-icon {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-lg);
}

.market-value, .projection-value, .revenue-potential {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--accent-color);
    margin: var(--spacing-md) 0;
}

.tier-card.featured {
    border-color: var(--accent-color);
    box-shadow: var(--shadow-lg);
    transform: scale(1.05);
}

/* Use Cases */
.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.use-case-item {
    background: var(--tertiary-bg);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--accent-bg);
}

.use-case-features {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.feature-tag {
    background: var(--accent-bg);
    color: var(--accent-color);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
}

/* Technology Features */
.features-grid, .capabilities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.feature-item, .capability-item {
    background: var(--tertiary-bg);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--accent-bg);
}

.capability-specs, .spec-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.spec, .capability-spec {
    background: var(--accent-bg);
    color: var(--accent-color);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
}

/* Service Cards */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.service-card {
    background: var(--tertiary-bg);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--accent-bg);
}

.service-features {
    margin-top: var(--spacing-md);
}

.service-features .feature {
    padding: var(--spacing-xs) 0;
    color: var(--secondary-text);
    border-bottom: 1px solid var(--accent-bg);
}

.service-features .feature:last-child {
    border-bottom: none;
}

/* Technical Specifications */
.specs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.spec-category {
    background: var(--tertiary-bg);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--accent-bg);
}

.spec-item {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--accent-bg);
}

.spec-item:last-child {
    border-bottom: none;
}

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

.spec-value {
    color: var(--accent-color);
    font-weight: 600;
}

/* Timeline */
.timeline {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.timeline-item {
    background: var(--tertiary-bg);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--accent-bg);
    position: relative;
}

.timeline-phase {
    background: var(--accent-color);
    color: var(--primary-bg);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    font-weight: 600;
    display: inline-block;
    margin-bottom: var(--spacing-md);
}

.timeline-duration {
    color: var(--accent-color);
    font-weight: 600;
    margin-top: var(--spacing-md);
}

/* Scientific Mission */
.mission-content {
    max-width: 1000px;
    margin: 0 auto;
}

.mission-intro {
    font-size: var(--font-size-xl);
    text-align: center;
    margin-bottom: var(--spacing-3xl);
    color: var(--secondary-text);
}

/* Inline links on dark theme content pages */
.main-content .content-link,
.main-content .mission-intro a:not(.btn),
.main-content .open-science-intro a:not(.btn),
.main-content .mission-content a:not(.btn) {
    color: var(--accent-color);
    text-decoration: underline;
    text-underline-offset: 3px;
    transition: color 0.2s ease;
}

.main-content .content-link:link,
.main-content .content-link:visited,
.main-content .mission-intro a:not(.btn):link,
.main-content .mission-intro a:not(.btn):visited,
.main-content .open-science-intro a:not(.btn):link,
.main-content .open-science-intro a:not(.btn):visited,
.main-content .mission-content a:not(.btn):link,
.main-content .mission-content a:not(.btn):visited {
    color: var(--accent-color);
}

.main-content .content-link:hover,
.main-content .content-link:focus,
.main-content .mission-intro a:not(.btn):hover,
.main-content .mission-intro a:not(.btn):focus,
.main-content .open-science-intro a:not(.btn):hover,
.main-content .open-science-intro a:not(.btn):focus,
.main-content .mission-content a:not(.btn):hover,
.main-content .mission-content a:not(.btn):focus {
    color: var(--primary-text);
}

.mission-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.mission-item {
    background: var(--tertiary-bg);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--accent-bg);
}

/* Research Applications */
.applications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.application-item {
    background: var(--tertiary-bg);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--accent-bg);
}

.application-benefits {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.benefit {
    background: var(--accent-bg);
    color: var(--accent-color);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
}

/* CERN Comparison */
.comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-3xl);
}

.comparison-item {
    background: var(--tertiary-bg);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--accent-bg);
}

.comparison-item ul {
    list-style: none;
    margin-top: var(--spacing-md);
}

.comparison-item li {
    padding: var(--spacing-xs) 0;
    color: var(--secondary-text);
    position: relative;
    padding-left: var(--spacing-lg);
}

.comparison-item li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

.comparison-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
    text-align: center;
}

.stat {
    background: var(--tertiary-bg);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--accent-bg);
}

.stat-value {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: var(--spacing-sm);
}

.stat-label {
    color: var(--secondary-text);
    font-size: var(--font-size-sm);
}

/* Open Science */
.open-science-content {
    max-width: 1000px;
    margin: 0 auto;
}

.open-science-intro {
    font-size: var(--font-size-xl);
    text-align: center;
    margin-bottom: var(--spacing-3xl);
    color: var(--secondary-text);
}

.open-science-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.open-science-item {
    background: var(--tertiary-bg);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--accent-bg);
    text-align: center;
}

/* Impact Grid */
.impact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.impact-item {
    background: var(--tertiary-bg);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--accent-bg);
    text-align: center;
    display: block;
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

.impact-item:hover {
    border-color: var(--accent-color);
    transform: translateY(-2px);
}

.section-title a {
    color: var(--primary-text);
    text-decoration: none;
}

.section-title a:hover {
    color: var(--accent-color);
    transition: color 0.3s ease;
}

.unification-theory {
    margin-bottom: var(--spacing-3xl);
}

/* Unification Theory page: less vertical gap hero → The Theory → Core Ideas */
.page-unification-theory .hero {
    padding: var(--spacing-2xl) 0 var(--spacing-md);
}

.page-unification-theory .hero-paper-heading {
    margin: 0 auto var(--spacing-md);
}

.page-unification-theory .hero-subtitle {
    margin-bottom: 0;
}

.page-unification-theory .unification-theory {
    padding: var(--spacing-lg) 0 var(--spacing-md);
    margin-bottom: 0;
}

.page-unification-theory .unification-theory .section-title {
    margin-bottom: var(--spacing-lg);
}

.page-unification-theory .ut-intro-core-ideas {
    padding: var(--spacing-md) 0 var(--spacing-2xl);
}

.page-unification-theory .ut-intro-core-ideas .section-title {
    margin-bottom: var(--spacing-lg);
}

/* Paper Style for UT Sections and Appendices */
.paper-wrapper {
    background: var(--primary-bg);
    padding: var(--spacing-3xl) 0;
}

.read-more-prompt {
    background: var(--primary-bg);
    padding: var(--spacing-lg) 0 var(--spacing-2xl);
    text-align: center;
}

.read-more-below {
    margin: 0;
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--accent-color);
    letter-spacing: 0.02em;
}

.paper-content {
    background: #ffffff;
    max-width: 900px;
    margin: 0 auto;
    padding: 3rem 4rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    border-radius: 4px;
    color: #333333;
}

.paper-content h1,
.paper-content h2,
.paper-content h3,
.paper-content h4,
.paper-content h5,
.paper-content h6 {
    color: #222222;
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.paper-content h1 {
    font-size: 2.5rem;
    border-bottom: 2px solid #e0e0e0;
    padding-bottom: 0.5rem;
}

.paper-content h1.paper-main-title {
    font-size: unset;
    line-height: 1.25;
}

.paper-content h1.paper-main-title .paper-title-name {
    display: block;
    font-size: 1.85rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: #222222;
}

.paper-content h1.paper-main-title .paper-title-framework {
    display: block;
    font-size: 1.35rem;
    font-weight: 600;
    line-height: 1.35;
    color: #333333;
}

.paper-content .paper-abstract {
    margin-bottom: 1.75rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #e8e8e8;
}

.paper-content .paper-download-row {
    margin: 0 0 0.75rem;
}

.paper-content .paper-pdf-link {
    font-weight: 600;
    color: #1a56a8;
}

.paper-content .paper-author {
    margin-bottom: 1.25rem;
}

.paper-content .paper-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.25rem 0;
    font-size: 0.88rem;
}

.paper-content .paper-table td {
    border: 1px solid #ccc;
    padding: 0.45rem 0.55rem;
    vertical-align: top;
}

.paper-content .paper-bibliography dd {
    margin-bottom: 1rem;
}

.paper-content .tex-cite {
    color: #555;
    font-size: 0.95em;
}

.smb-intro {
    max-width: 52rem;
    margin: 0 auto 1.5rem;
    text-align: left;
    line-height: 1.75;
    color: var(--secondary-text);
}

.smb-pdf-sep {
    opacity: 0.75;
}

.paper-content h2 {
    font-size: 2rem;
    margin-top: 2.5rem;
}

.paper-content h3 {
    font-size: 1.5rem;
}

.paper-content p {
    line-height: 1.8;
    margin-bottom: 1rem;
    color: #444444;
}

.paper-content ul,
.paper-content ol {
    margin: 1rem 0;
    padding-left: 2rem;
}

.paper-content li {
    margin: 0.5rem 0;
    line-height: 1.7;
}

.paper-content blockquote {
    border-left: 4px solid #cccccc;
    padding-left: 1.5rem;
    margin: 1.5rem 0;
    font-style: italic;
    color: #666666;
}

.paper-content code {
    background: #f5f5f5;
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

.paper-content pre {
    background: #f5f5f5;
    padding: 1rem;
    border-radius: 4px;
    overflow-x: auto;
    margin: 1.5rem 0;
}

.paper-content pre code {
    background: none;
    padding: 0;
}

.paper-content dt {
    font-weight: 600;
    margin-top: 1rem;
}

.paper-content dd {
    margin-left: 1.5rem;
    margin-bottom: 0.5rem;
}

/* Bibliography Links */
.bibliography-section {
    max-width: 1000px;
    margin: 0 auto;
}

.bibliography-list {
    list-style: none;
    padding: 0;
    margin: 1.5rem 0;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 0.75rem;
}

.bibliography-list li {
    margin: 0;
}

.bibliography-list a {
    display: block;
    padding: 0.75rem 1rem;
    background: var(--tertiary-bg);
    border: 1px solid var(--accent-bg);
    border-radius: var(--border-radius);
    color: var(--primary-text);
    text-decoration: none;
    transition: all 0.3s ease;
    font-size: var(--font-size-sm);
}

.bibliography-list a:hover {
    background: var(--accent-bg);
    border-color: var(--accent-color);
    transform: translateX(4px);
}

.bibliography-section h3 {
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    color: var(--primary-text);
}

/* UT Navigation */
.ut-navigation {
    margin: 2rem 0 3rem;
    padding: 1.5rem 0;
    border-top: 2px solid #e0e0e0;
    border-bottom: 2px solid #e0e0e0;
}

.ut-nav-links {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    max-width: 900px;
    margin: 0 auto;
}

.ut-nav-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.875rem 1.25rem;
    background: #f5f5f5;
    border: 1px solid #dddddd;
    border-radius: var(--border-radius);
    color: #333333;
    text-decoration: none;
    transition: all 0.3s ease;
    flex: 1;
    min-width: 0;
}

.ut-nav-link:hover {
    background: #e8e8e8;
    border-color: #00d4ff;
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.ut-nav-link.ut-nav-home {
    flex: 0 0 auto;
    background: #00d4ff;
    border-color: #00d4ff;
    color: #ffffff;
}

.ut-nav-link.ut-nav-home:hover {
    background: #00b8e6;
    border-color: #00b8e6;
    color: #ffffff;
}

.ut-nav-link.ut-nav-disabled {
    opacity: 0.3;
    cursor: not-allowed;
    pointer-events: none;
}

.ut-nav-prev {
    text-align: left;
}

.ut-nav-next {
    text-align: right;
    flex-direction: row-reverse;
}

.ut-nav-text {
    display: flex;
    flex-direction: column;
    min-width: 0;
    flex: 1;
}

.ut-nav-label {
    font-size: var(--font-size-xs);
    color: #888888;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.25rem;
}

.ut-nav-link:hover .ut-nav-label {
    color: #00d4ff;
}

.ut-nav-link.ut-nav-home .ut-nav-label {
    color: rgba(255, 255, 255, 0.8);
}

.ut-nav-title {
    font-size: var(--font-size-sm);
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.ut-nav-arrow {
    font-size: 1.25rem;
    font-weight: 600;
    flex-shrink: 0;
}

@media (max-width: 768px) {
    .paper-content {
        padding: 2rem 1.5rem;
        margin: 0 1rem;
    }
    
    .bibliography-list {
        grid-template-columns: 1fr;
    }
    
    .ut-nav-links {
        flex-direction: column;
    }
    
    .ut-nav-link {
        width: 100%;
    }
    
    .ut-nav-link.ut-nav-home {
        order: -1;
    }
    
    .ut-nav-next {
        flex-direction: row;
    }
}

/* Cost Benefits */
.cost-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.cost-item {
    background: var(--tertiary-bg);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--accent-bg);
    text-align: center;
}

.cost-savings {
    color: var(--success-color);
    font-weight: 700;
    font-size: var(--font-size-lg);
    margin-top: var(--spacing-md);
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .logo-img {
        width: 96px;
        height: 96px;
    }
    
    .nav-toggle {
        display: block;
        position: fixed;
        top: 20px;
        right: 100px;
        background: none;
        border: none;
        cursor: pointer;
        padding: var(--spacing-sm);
        z-index: 1001;
    }
    
    .nav-menu {
        position: fixed;
        top: 60px;
        right: 50px;
        background: var(--secondary-bg);
        padding: var(--spacing-md);
        border: 1px solid var(--accent-bg);
        border-radius: var(--border-radius);
        box-shadow: var(--shadow-lg);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-10px);
        transition: all 0.2s ease;
        z-index: 1000;
        width: 200px;
    }
    
    .nav-menu.active {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }
    
    .main-content {
        margin-top: 200px;
    }
    
    .hero-title {
        font-size: var(--font-size-4xl);
    }

    .hero-paper-heading {
        font-size: var(--font-size-lg);
        padding: 0 var(--spacing-sm);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 300px;
        text-align: center;
    }
    
    .purpose-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .logo-img {
        width: 96px;
        height: 96px;
    }
    
    .footer-logo {
        width: 80px;
        height: 80px;
    }
}

/* Mission Page Styles */
.mission-section, .charge-section {
    padding: var(--spacing-3xl) 0;
    background: var(--primary-bg);
}

.charge-section {
    background: var(--secondary-bg);
}

.mission-text {
    font-size: var(--font-size-lg);
    line-height: 1.8;
    color: var(--secondary-text);
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.charge-content {
    max-width: 900px;
    margin: 0 auto;
}

.charge-subtitle {
    font-size: var(--font-size-2xl);
    color: var(--accent-color);
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    font-weight: 600;
}

.charge-text {
    font-size: var(--font-size-base);
    line-height: 1.7;
    color: var(--primary-text);
}

.charge-text p {
    margin-bottom: var(--spacing-lg);
    text-align: left;
}

.charge-conclusion {
    font-size: var(--font-size-lg);
    font-style: italic;
    color: var(--accent-color);
    text-align: center;
    margin-top: var(--spacing-2xl);
    padding: var(--spacing-xl);
    background: var(--accent-bg);
    border-radius: var(--border-radius-lg);
    border-left: 4px solid var(--accent-color);
}

@media (max-width: 768px) {
    .mission-text {
        font-size: var(--font-size-base);
        padding: 0 var(--spacing-md);
    }
    
    .charge-text {
        font-size: var(--font-size-sm);
        padding: 0 var(--spacing-md);
    }
    
    .charge-conclusion {
        font-size: var(--font-size-base);
        padding: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero {
        padding: var(--spacing-2xl) 0;
    }
    
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .tech-grid {
        grid-template-columns: 1fr;
    }
    
    .market-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}