/* CSS Variables for Light Theme (React.dev inspired) */
 :root {
     --bg-primary: #ffffff;
     --bg-secondary: #f3f4f6;
     --text-primary: #0f172a;
     --text-secondary: #334155;
     --accent-color: #087ea4;
     /* React Blue (Darker for light mode) */
     --accent-hover: #066888;
     --border-color: #e5e7eb;
     --code-bg: #f6f7f9;
     --card-bg: #ffffff;
     --nav-height: 60px;
     --font-sans: 'Vend Sans', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
     --font-mono: 'Space Mono', 'JetBrains Mono', 'Fira Code', monospace;
     --font-heading: 'Saira', sans-serif;
 }

 h1,
 h2,
 h3,
 h4,
 h5,
 h6,
 .hero-sub,
 .hero-title,
 .social-proof h2,
 .features h2,
 .infrastructure h2,
 .code-showcase h2,
 .resources h2 {
     font-family: var(--font-heading);
 }

 h2 {
     font-weight: 500;
 }

 h3,
 h4,
 h5,
 h6 {
     font-weight: 500;
 }

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

 body {
     background-color: var(--bg-primary);
     color: var(--text-primary);
     font-family: var(--font-sans);
     line-height: 1.6;
     -webkit-font-smoothing: antialiased;
 }

 a {
     color: var(--accent-color);
     text-decoration: none;
     transition: color 0.2s ease;
 }

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

 /* Hero Section */
 .hero {
     padding: 4rem 2rem 4rem;
     text-align: center;
     max-width: 1200px;
     margin: 0 auto;
 }

 .hero-title-container {
     display: flex;
     align-items: center;
     justify-content: center;
     gap: 1.5rem;
     margin-bottom: 1rem;
 }

 .logo-inline {
     height: 120px;
     width: auto;
 }

 .hero-title {
     font-size: 4rem;
     font-weight: 500;
     margin: 0;
     background: linear-gradient(120deg, #0f172a, #334155);
     background-clip: text;
     -webkit-background-clip: text;
     -webkit-text-fill-color: transparent;
 }

 .hero h1 {
     font-size: 4rem;
     font-weight: 500;
     margin-bottom: 0.5rem;
     background: linear-gradient(120deg, #0f172a, #334155);
     background-clip: text;
     -webkit-background-clip: text;
     -webkit-text-fill-color: transparent;
 }

 .hero-sub {
     font-size: 1.5rem;
     color: var(--text-secondary);
     margin-bottom: 1.5rem;
     font-weight: 400;
 }

 .hero-tagline {
     font-size: 1.1rem;
     color: var(--text-secondary);
     max-width: 700px;
     margin: 0 auto 2.5rem;
 }

 .cta-group {
     display: flex;
     gap: 1rem;
     justify-content: center;
     margin-bottom: 4rem;
 }

 .btn {
     display: inline-flex;
     align-items: center;
     justify-content: center;
     padding: 0.75rem 1.5rem;
     font-weight: 600;
     border-radius: 4px;
     transition: all 0.2s;
     text-decoration: none;
     cursor: pointer;
     font-size: 1rem;
     gap: 0.5rem;
 }

 .btn-icon {
     width: 1.25em;
     height: 1.25em;
     fill: currentColor;
 }

 .btn:hover {
     transform: translateY(-1px);
 }

 .btn-primary {
     background-color: var(--accent-color);
     color: #fff;
     border: none;
 }

 .btn-primary:hover {
     background-color: var(--accent-hover);
     box-shadow: 0 4px 14px rgba(20, 158, 202, 0.4);
 }

 .btn-secondary {
     background-color: var(--bg-secondary);
     color: var(--text-primary);
     border: 1px solid var(--border-color);
 }

 .btn-secondary:hover {
     background-color: var(--card-bg);
 }

 /* Social Proof */
 .social-proof {
     text-align: center;
     padding: 2rem;
     border-top: 1px solid var(--border-color);
     border-bottom: 1px solid var(--border-color);
     background-color: var(--bg-secondary);
 }

 .social-proof h2 {
     font-size: 1.6rem;
     letter-spacing: 1px;
     color: var(--text-secondary);
     margin-bottom: 3rem;
 }

 .logo-grid {
     display: flex;
     justify-content: center;
     gap: 2.5rem 3rem;
     flex-wrap: wrap;
     align-items: center;
     max-width: 900px;
     margin: 0 auto;
 }

 .company-logo {
     height: 40px;
     width: auto;
     max-width: 150px;
     min-width: 80px;
     object-fit: contain;
     opacity: 0.8;
     transition: all 0.3s ease;
 }

 .company-logo:hover {
     opacity: 1;
     transform: scale(1.05);
 }

 /* Features Grid */
 .features {
     padding: 4rem 2rem;
     max-width: 1200px;
     margin: 0 auto;
 }

 .feature-grid {
     display: grid;
     grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
     gap: 2rem;
     max-width: 900px;
     margin: 0 auto;
 }

 .feature-card {
     background-color: var(--card-bg);
     padding: 2rem;
     border-radius: 4px;
     border: 1px solid var(--border-color);
     transition: transform 0.2s ease;
 }

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

 .feature-icon {
     font-size: 1.5rem;
     margin-right: 0.5rem;
     color: #262cd9;
     vertical-align: middle;
 }

 .feature-card h3 {
     font-size: 1.25rem;
     margin-bottom: 0.75rem;
 }

 .feature-card p {
     color: var(--text-secondary);
     font-size: 0.95rem;
 }

 /* Infrastructure Section */
 .infrastructure {
     padding: 4rem 2rem;
     background-color: var(--bg-secondary);
     text-align: center;
 }

 .infra-container {
     max-width: 1000px;
     margin: 0 auto;
 }

 .infra-grid {
     display: grid;
     grid-template-columns: repeat(4, 1fr);
     gap: 2rem;
     margin-top: 3rem;
 }

 .infra-item {
     display: flex;
     flex-direction: column;
     align-items: center;
     gap: 1rem;
 }

 .infra-box {
     width: 80px;
     height: 80px;
     background-color: var(--card-bg);
     border-radius: 4px;
     display: flex;
     align-items: center;
     justify-content: center;
     border: 1px solid var(--border-color);
     font-size: 2rem;
 }

 /* Code Showcase */
 .code-showcase {
     padding: 4rem 2rem;
     max-width: 1000px;
     margin: 0 auto;
 }

 .code-showcase h2 {
     margin-bottom: 3rem;
 }

 .tabs {
     display: flex;
     gap: 1rem;
     margin-bottom: 1rem;
     border-bottom: 1px solid var(--border-color);
 }

 .tab-btn {
     background: none;
     border: none;
     color: var(--text-secondary);
     padding: 0.75rem 1rem;
     cursor: pointer;
     font-size: 1rem;
     font-weight: 500;
     position: relative;
 }

 .tab-btn.active {
     color: var(--accent-color);
 }

 .tab-btn.active::after {
     content: '';
     position: absolute;
     bottom: -1px;
     left: 0;
     width: 100%;
     height: 2px;
     background-color: var(--accent-color);
 }

 .code-panel {
     display: none;
     background-color: var(--code-bg);
     border-radius: 4px;
     padding: 1.5rem;
     border: 1px solid var(--border-color);
     overflow-x: auto;
 }

 .code-panel.active {
     display: block;
 }

 .code-context {
     margin-bottom: 1rem;
     color: var(--text-secondary);
     font-style: italic;
 }

 pre {
     font-family: var(--font-mono);
     font-size: 0.9rem;
     color: #23272f;
 }

 /* Syntax Highlighting (High Contrast) */
 .kw {
     color: #d73a49;
     font-weight: 600;
 }

 /* Keyword - Red */
 .str {
     color: #22863a;
 }

 /* String - Green */
 .fn {
     color: #6f42c1;
 }

 /* Function - Purple */
 .num {
     color: #005cc5;
 }

 /* Number - Blue */
 .cls {
     color: #e36209;
 }

 /* Class - Orange */

 /* Resources Section */
 .resources {
     padding: 4rem 2rem;
     max-width: 1000px;
     margin: 0 auto;
     background-color: var(--bg-secondary);
 }

 .resources h2 {
     text-align: center;
     margin-bottom: 3rem;
     font-size: 2.5rem;
 }

 .resource-grid {
     display: grid;
     grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
     gap: 2rem;
 }

 .resource-card {
     background-color: var(--card-bg);
     border: 1px solid var(--border-color);
     border-radius: 8px;
     padding: 2rem;
     transition: transform 0.2s, box-shadow 0.2s;
     display: flex;
     flex-direction: column;
     height: 100%;
     text-decoration: none;
     color: inherit;
 }

 .resource-card:hover {
     transform: translateY(-4px);
     box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
     border-color: var(--accent-color);
 }

 .resource-type {
     font-size: 0.8rem;
     text-transform: uppercase;
     letter-spacing: 1px;
     color: var(--accent-color);
     margin-bottom: 0.5rem;
     font-weight: 600;
 }

 .resource-card h3 {
     font-size: 1.25rem;
     margin-bottom: 1rem;
     line-height: 1.4;
     flex-grow: 1;
 }

 .resource-meta {
     font-size: 0.9rem;
     color: var(--text-secondary);
     margin-top: auto;
     display: flex;
     align-items: center;
     gap: 0.5rem;
 }

 /* Footer */
 footer {
     padding: 4rem 2rem;
     border-top: 1px solid var(--border-color);
     text-align: center;
     color: var(--text-secondary);
     font-size: 0.9rem;
 }

 .footer-links {
     display: flex;
     justify-content: center;
     gap: 2rem;
     margin-bottom: 2rem;
 }

 /* Responsive */
 @media (max-width: 768px) {
     .hero h1 {
         font-size: 2.5rem;
     }

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

     .nav-links {
         display: none;
     }

     /* Simplified mobile nav */
 }

 /* Infrastructure Logos */
 .infra-box {
     width: 120px;
     height: 120px;
     background-color: var(--card-bg);
     border-radius: 4px;
     display: flex;
     align-items: center;
     justify-content: center;
     border: 1px solid var(--border-color);
     padding: 1rem;
     overflow: hidden;
 }

 .infra-logo {
     max-width: 100%;
     max-height: 100%;
     object-fit: contain;
 }

 .logo-stack {
     display: flex;
     flex-wrap: wrap;
     justify-content: center;
     gap: 0.5rem;
 }

 .infra-logo-small {
     width: 40px;
     height: 40px;
     object-fit: contain;
 }