/* ============================================
   Crypto Custody Landscape - EEA
   Enterprise Ethereum Alliance
   ============================================ */

/* CSS Variables */
:root {
    --color-primary: #3b82f6;
    --color-primary-dark: #2563eb;
    --color-secondary: #8b5cf6;
    --color-secondary-dark: #7c3aed;
    --color-success: #10b981;
    --color-success-dark: #059669;
    --color-warning: #f59e0b;
    --color-warning-dark: #d97706;
    --color-danger: #ef4444;
    --color-danger-dark: #dc2626;

    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;

    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;

    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

    --radius-sm: 0.25rem;
    --radius: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;

    --transition-fast: 150ms ease;
    --transition: 200ms ease;
    --transition-slow: 300ms ease;
}

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

* {
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-gray-800);
    background-color: #fff;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img, picture, video, canvas, svg {
    display: block;
    max-width: 100%;
}

input, button, textarea, select {
    font: inherit;
}

p, h1, h2, h3, h4, h5, h6 {
    overflow-wrap: break-word;
}

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

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

ul, ol {
    list-style-position: inside;
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Navigation */
.main-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-gray-200);
    transition: all var(--transition);
}

.main-nav.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
    color: var(--color-gray-900);
    text-decoration: none;
}

.nav-logo:hover {
    color: var(--color-gray-900);
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-divider {
    width: 1px;
    height: 24px;
    background: var(--color-gray-300);
}

.logo-subtitle {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-gray-600);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    list-style: none;
}

.nav-links li a {
    display: block;
    padding: 0.5rem 0.875rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-gray-600);
    border-radius: var(--radius);
    transition: all var(--transition-fast);
}

.nav-links li a:hover {
    color: var(--color-primary);
    background: var(--color-gray-50);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    cursor: pointer;
    gap: 5px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-gray-700);
    border-radius: 1px;
    transition: all var(--transition-fast);
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Hero Section */
.hero {
    padding: 8rem 1.5rem 5rem;
    background: linear-gradient(135deg, var(--color-gray-50) 0%, #fff 50%, #eff6ff 100%);
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-primary);
    background: rgba(59, 130, 246, 0.1);
    border-radius: var(--radius-xl);
    margin-bottom: 1.5rem;
}

.hero h1 {
    font-family: var(--font-serif);
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 600;
    line-height: 1.15;
    color: var(--color-gray-900);
    margin-bottom: 1.5rem;
}

.hero-subtitle {
    font-size: 1.25rem;
    line-height: 1.6;
    color: var(--color-gray-600);
    margin-bottom: 2rem;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

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

.hero-illustration {
    width: 100%;
    max-width: 400px;
    height: auto;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 1.75rem;
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: white;
    box-shadow: 0 4px 14px 0 rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px 0 rgba(59, 130, 246, 0.4);
    color: white;
}

.btn-secondary {
    background: white;
    color: var(--color-gray-700);
    border: 1px solid var(--color-gray-300);
}

.btn-secondary:hover {
    background: var(--color-gray-50);
    border-color: var(--color-gray-400);
    color: var(--color-gray-900);
}

/* Sections */
.section {
    padding: 5rem 0;
}

.section-alt {
    background: var(--color-gray-50);
}

.section-header {
    margin-bottom: 2rem;
}

.section-number {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 0.5rem;
}

.section-header h2 {
    font-family: var(--font-serif);
    font-size: clamp(1.75rem, 3vw, 2.5rem);
    font-weight: 600;
    color: var(--color-gray-900);
    line-height: 1.2;
}

.section-intro {
    font-size: 1.125rem;
    color: var(--color-gray-600);
    max-width: 800px;
    margin-bottom: 3rem;
}

/* Content Grid */
.content-grid {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 3rem;
}

.content-text {
    max-width: 700px;
}

.content-text .lead {
    font-size: 1.25rem;
    color: var(--color-gray-700);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.content-text p {
    margin-bottom: 1rem;
    color: var(--color-gray-600);
}

.content-text h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.content-sidebar {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Sidebar Cards */
.sidebar-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    border: 1px solid var(--color-gray-200);
    box-shadow: var(--shadow-sm);
}

.sidebar-card h4 {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-primary);
    margin-bottom: 0.75rem;
}

.sidebar-card p {
    font-size: 0.9375rem;
    color: var(--color-gray-600);
    line-height: 1.6;
}

.sidebar-card ul {
    list-style: none;
    font-size: 0.9375rem;
    color: var(--color-gray-600);
}

.sidebar-card ul li {
    padding: 0.375rem 0;
    padding-left: 1rem;
    position: relative;
}

.sidebar-card ul li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.75rem;
    width: 4px;
    height: 4px;
    background: var(--color-primary);
    border-radius: 50%;
}

.sidebar-card-warning {
    background: #fffbeb;
    border-color: var(--color-warning);
}

.sidebar-card-warning h4 {
    color: var(--color-warning-dark);
}

.sidebar-card-warning ul li::before {
    background: var(--color-warning);
}

/* Info Cards */
.info-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin: 1.5rem 0;
}

.info-card {
    background: white;
    border-radius: var(--radius);
    padding: 1.25rem;
    border: 1px solid var(--color-gray-200);
    transition: all var(--transition);
}

.info-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.info-card-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(139, 92, 246, 0.1));
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 0.75rem;
}

.info-card-icon svg {
    width: 20px;
    height: 20px;
    color: var(--color-primary);
}

.info-card h4 {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: 0.5rem;
}

.info-card p {
    font-size: 0.875rem;
    color: var(--color-gray-500);
    margin-bottom: 0;
}

/* Highlight Box */
.highlight-box {
    background: linear-gradient(135deg, #eff6ff 0%, #f5f3ff 100%);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin: 1.5rem 0;
    border-left: 4px solid var(--color-primary);
}

.highlight-box h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: 1rem;
}

.highlight-box ul {
    list-style: none;
}

.highlight-box ul li {
    padding: 0.5rem 0;
    font-size: 0.9375rem;
    color: var(--color-gray-600);
}

.highlight-box ul li strong {
    color: var(--color-gray-800);
}

/* Diagrams */
.diagram-container {
    margin: 3rem 0;
    background: white;
    border-radius: var(--radius-lg);
    padding: 2rem;
    border: 1px solid var(--color-gray-200);
    box-shadow: var(--shadow);
}

.diagram-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: 1.5rem;
    text-align: center;
}

.diagram-wrapper {
    overflow-x: auto;
    padding: 1rem 0;
}

.diagram-wrapper svg {
    display: block;
    margin: 0 auto;
    min-width: 600px;
}

/* SVG Diagram Styles */
.diagram-header {
    font-size: 18px;
    font-weight: 600;
    fill: var(--color-gray-800);
}

.axis-label {
    font-size: 12px;
    fill: var(--color-gray-500);
}

.model-title {
    font-size: 16px;
    font-weight: 600;
}

.model-subtype {
    font-size: 13px;
    font-weight: 600;
    fill: var(--color-gray-800);
}

.model-desc {
    font-size: 11px;
    fill: var(--color-gray-500);
}

.model-trait {
    font-size: 11px;
    fill: var(--color-gray-600);
}

.decision-text {
    font-size: 13px;
    font-weight: 500;
    fill: var(--color-gray-700);
}

.branch-label {
    font-size: 11px;
    fill: var(--color-gray-500);
}

.flow-text {
    font-size: 14px;
    font-weight: 500;
}

.box-title {
    font-size: 13px;
    font-weight: 600;
    fill: var(--color-gray-800);
}

.box-subtitle {
    font-size: 11px;
    fill: var(--color-gray-500);
}

.category-title {
    font-size: 14px;
    font-weight: 600;
}

.provider-name {
    font-size: 13px;
    font-weight: 600;
    fill: var(--color-gray-800);
}

.provider-type {
    font-size: 11px;
    fill: var(--color-gray-600);
}

.provider-detail {
    font-size: 10px;
    fill: var(--color-gray-400);
}

.stack-title {
    font-size: 14px;
    font-weight: 600;
}

.stack-desc {
    font-size: 11px;
}

.layer-num {
    font-size: 14px;
    font-weight: 700;
}

.side-label {
    font-size: 12px;
    fill: var(--color-gray-400);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.diagram-footer {
    font-size: 12px;
    fill: var(--color-gray-500);
    font-style: italic;
}

/* Model Details */
.model-details {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 2rem;
}

.model-detail-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    border: 1px solid var(--color-gray-200);
}

.model-detail-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: 1rem;
}

.model-detail-card p {
    font-size: 0.9375rem;
    color: var(--color-gray-600);
    margin-bottom: 0.75rem;
}

.model-detail-card p:last-child {
    margin-bottom: 0;
}

/* Criteria Grid */
.criteria-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 2rem;
}

.criteria-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    border: 1px solid var(--color-gray-200);
    transition: all var(--transition);
}

.criteria-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.criteria-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(139, 92, 246, 0.1));
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
}

.criteria-icon svg {
    width: 24px;
    height: 24px;
    color: var(--color-primary);
}

.criteria-card h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: 0.75rem;
}

.criteria-card ul {
    list-style: none;
}

.criteria-card ul li {
    font-size: 0.875rem;
    color: var(--color-gray-600);
    padding: 0.375rem 0;
    padding-left: 1rem;
    position: relative;
}

.criteria-card ul li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.75rem;
    width: 4px;
    height: 4px;
    background: var(--color-primary);
    border-radius: 50%;
}

/* Landscape Note */
.landscape-note {
    background: #fffbeb;
    border-radius: var(--radius);
    padding: 1rem 1.5rem;
    margin-top: 2rem;
    border-left: 4px solid var(--color-warning);
}

.landscape-note p {
    font-size: 0.9375rem;
    color: var(--color-gray-600);
    margin: 0;
}

.landscape-note strong {
    color: var(--color-warning-dark);
}

/* Category Details */
.category-details {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-top: 2rem;
}

.category-detail {
    background: white;
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    border: 1px solid var(--color-gray-200);
}

.category-badge {
    display: inline-block;
    padding: 0.375rem 0.875rem;
    font-size: 0.75rem;
    font-weight: 600;
    color: white;
    border-radius: var(--radius);
    margin-bottom: 1rem;
}

.category-detail p {
    font-size: 0.9375rem;
    color: var(--color-gray-600);
    line-height: 1.6;
    margin: 0;
}

/* Stack Explanation */
.stack-explanation {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-top: 2rem;
}

.stack-item {
    background: white;
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    border: 1px solid var(--color-gray-200);
}

.stack-item h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: 0.75rem;
}

.stack-item p {
    font-size: 0.9375rem;
    color: var(--color-gray-600);
    line-height: 1.6;
    margin: 0;
}

/* Use Cases */
.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.use-case-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    border: 1px solid var(--color-gray-200);
    transition: all var(--transition);
}

.use-case-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-lg);
}

.use-case-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--color-gray-100);
}

.use-case-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(139, 92, 246, 0.1));
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.use-case-icon svg {
    width: 24px;
    height: 24px;
    color: var(--color-primary);
}

.use-case-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin: 0;
}

.use-case-content p {
    font-size: 0.875rem;
    color: var(--color-gray-600);
    margin-bottom: 1rem;
}

.use-case-content h4 {
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-gray-500);
    margin-bottom: 0.5rem;
    margin-top: 1rem;
}

.use-case-content ul {
    list-style: none;
    font-size: 0.875rem;
    color: var(--color-gray-600);
}

.use-case-content ul li {
    padding: 0.25rem 0;
    padding-left: 1rem;
    position: relative;
}

.use-case-content ul li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.625rem;
    width: 4px;
    height: 4px;
    background: var(--color-primary);
    border-radius: 50%;
}

/* Use Cases Note */
.use-cases-note {
    margin-top: 3rem;
    background: linear-gradient(135deg, #eff6ff 0%, #f5f3ff 100%);
    border-radius: var(--radius-lg);
    padding: 2rem;
    border: 1px solid rgba(59, 130, 246, 0.2);
}

.use-cases-note h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: 1rem;
}

.use-cases-note ol {
    list-style: none;
    counter-reset: steps;
}

.use-cases-note ol li {
    counter-increment: steps;
    padding: 0.75rem 0;
    padding-left: 2.5rem;
    position: relative;
    font-size: 0.9375rem;
    color: var(--color-gray-600);
    border-bottom: 1px solid rgba(59, 130, 246, 0.1);
}

.use-cases-note ol li:last-child {
    border-bottom: none;
}

.use-cases-note ol li::before {
    content: counter(steps);
    position: absolute;
    left: 0;
    top: 0.75rem;
    width: 24px;
    height: 24px;
    background: var(--color-primary);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.use-cases-note ol li strong {
    color: var(--color-gray-800);
}

/* Methodology */
.methodology-content {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 3rem;
}

.methodology-main h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.methodology-main h3:first-child {
    margin-top: 0;
}

.methodology-main p {
    font-size: 0.9375rem;
    color: var(--color-gray-600);
    margin-bottom: 1rem;
}

.methodology-main ul {
    list-style: none;
    margin-bottom: 1rem;
}

.methodology-main ul li {
    font-size: 0.9375rem;
    color: var(--color-gray-600);
    padding: 0.375rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.methodology-main ul li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.75rem;
    width: 6px;
    height: 6px;
    background: var(--color-primary);
    border-radius: 50%;
}

.methodology-main ul li strong {
    color: var(--color-gray-800);
}

.methodology-sidebar {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Engagement */
.engagement-content {
    max-width: 100%;
}

.engagement-intro {
    margin-bottom: 2.5rem;
}

.engagement-intro .lead {
    font-size: 1.25rem;
    color: var(--color-gray-600);
    line-height: 1.7;
}

.engagement-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.engagement-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 2rem;
    border: 1px solid var(--color-gray-200);
}

.engagement-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: 1rem;
}

.engagement-card p {
    font-size: 0.9375rem;
    color: var(--color-gray-600);
    margin-bottom: 1rem;
}

.engagement-card ul {
    list-style: none;
    margin-bottom: 1rem;
}

.engagement-card ul li {
    font-size: 0.9375rem;
    color: var(--color-gray-600);
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.engagement-card ul li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.875rem;
    width: 6px;
    height: 6px;
    background: var(--color-primary);
    border-radius: 50%;
}

.engagement-card ul li strong {
    color: var(--color-gray-800);
}

.engagement-cta {
    background: linear-gradient(135deg, var(--color-gray-900), #1e3a5f);
    border-radius: var(--radius-lg);
    padding: 3rem;
    color: white;
}

.engagement-cta h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.engagement-cta p {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 1rem;
    max-width: 700px;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.engagement-cta .btn-primary {
    background: white;
    color: var(--color-gray-900);
    box-shadow: none;
}

.engagement-cta .btn-primary:hover {
    background: var(--color-gray-100);
    transform: translateY(-2px);
}

.engagement-cta .btn-secondary {
    background: transparent;
    color: white;
    border-color: rgba(255, 255, 255, 0.3);
}

.engagement-cta .btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
    color: white;
}

/* Footer */
.main-footer {
    background: var(--color-gray-900);
    color: white;
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 4rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand {
    max-width: 400px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.footer-logo .logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #60a5fa, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-logo .logo-divider {
    background: rgba(255, 255, 255, 0.3);
}

.footer-logo .logo-subtitle {
    color: rgba(255, 255, 255, 0.7);
}

.footer-brand p {
    font-size: 0.9375rem;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.6;
}

.footer-links {
    display: flex;
    gap: 4rem;
}

.footer-column h4 {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: rgba(255, 255, 255, 0.5);
    margin-bottom: 1rem;
}

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

.footer-column ul li {
    padding: 0.375rem 0;
}

.footer-column ul li a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9375rem;
    transition: color var(--transition-fast);
}

.footer-column ul li a:hover {
    color: white;
}

.footer-bottom {
    padding-top: 2rem;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.5);
    margin-bottom: 0.5rem;
}

.footer-disclaimer {
    font-size: 0.8125rem;
    color: rgba(255, 255, 255, 0.4);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .content-grid {
        grid-template-columns: 1fr;
    }

    .content-sidebar {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
    }

    .model-details {
        grid-template-columns: 1fr;
    }

    .criteria-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .use-cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .methodology-content {
        grid-template-columns: 1fr;
    }

    .methodology-sidebar {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
    }

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

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .footer-links {
        gap: 2rem;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 1rem;
        border-bottom: 1px solid var(--color-gray-200);
        box-shadow: var(--shadow-lg);
    }

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

    .nav-links li a {
        padding: 0.75rem 1rem;
        width: 100%;
    }

    .nav-toggle {
        display: flex;
    }

    .hero {
        padding: 6rem 1.5rem 3rem;
        min-height: auto;
    }

    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

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

    .hero-visual {
        order: -1;
    }

    .hero-illustration {
        max-width: 280px;
    }

    .section {
        padding: 3rem 0;
    }

    .info-cards {
        grid-template-columns: 1fr;
    }

    .content-sidebar {
        grid-template-columns: 1fr;
    }

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

    .category-details {
        grid-template-columns: 1fr;
    }

    .stack-explanation {
        grid-template-columns: 1fr;
    }

    .use-cases-grid {
        grid-template-columns: 1fr;
    }

    .methodology-sidebar {
        grid-template-columns: 1fr;
    }

    .engagement-cta {
        padding: 2rem;
    }

    .cta-buttons {
        flex-direction: column;
    }

    .footer-links {
        flex-direction: column;
        gap: 1.5rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    .hero h1 {
        font-size: 1.75rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .btn {
        padding: 0.75rem 1.25rem;
        font-size: 0.875rem;
        width: 100%;
    }

    .diagram-container {
        padding: 1rem;
    }

    .engagement-cta {
        padding: 1.5rem;
    }
}

/* Print Styles */
@media print {
    .main-nav {
        display: none;
    }

    .hero {
        padding-top: 2rem;
        min-height: auto;
    }

    .btn {
        display: none;
    }

    .section {
        page-break-inside: avoid;
    }

    .diagram-container {
        page-break-inside: avoid;
    }
}