*{margin:0;padding:0;box-sizing:border-box}:root{--primary-color: #6366f1;--primary-dark: #4f46e5;--secondary-color: #8b5cf6;--success-color: #10b981;--danger-color: #ef4444;--warning-color: #f59e0b;--dark-color: #1e293b;--light-color: #f8fafc;--border-color: #e2e8f0;--text-primary: #0f172a;--text-secondary: #64748b;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1);--radius: 8px;--radius-lg: 16px}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;color:var(--text-primary);line-height:1.6}.app{display:flex;flex-direction:column;min-height:100vh}.main-content{flex:1;padding:2rem 0}.container{max-width:1200px;margin:0 auto;padding:0 2rem}.header{background:#fff;border-bottom:1px solid var(--border-color);padding:1rem 0;position:sticky;top:0;z-index:100}.header .container{display:flex;justify-content:space-between;align-items:center}.logo{display:flex;align-items:center;gap:.5rem;text-decoration:none;color:var(--text-primary);font-weight:700;font-size:1.25rem}.logo-icon{font-size:2rem}.nav{display:flex;gap:2rem;align-items:center}.nav a{text-decoration:none;color:var(--text-secondary);font-weight:500;transition:color .2s}.nav a:hover{color:var(--primary-color)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.75rem 1.5rem;border-radius:var(--radius);font-weight:600;text-decoration:none;transition:all .2s;border:none;cursor:pointer;font-size:1rem}.btn-primary{background:var(--primary-color);color:#fff}.btn-primary:hover{background:var(--primary-dark);transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn-secondary{background:var(--light-color);color:var(--text-primary);border:1px solid var(--border-color)}.btn-secondary:hover{background:#fff;border-color:var(--primary-color);color:var(--primary-color)}.btn-large{padding:1rem 2rem;font-size:1.125rem}.hero{padding:4rem 0;text-align:center;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.hero-title{font-size:3.5rem;font-weight:800;margin-bottom:1.5rem;line-height:1.1}.gradient-text{background:linear-gradient(135deg,#f093fb,#f5576c);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero-subtitle{font-size:1.25rem;margin-bottom:2rem;opacity:.9;max-width:600px;margin-left:auto;margin-right:auto}.hero-actions{display:flex;gap:1rem;justify-content:center;margin-bottom:3rem}.spreadsheet-preview{background:#fff;border-radius:var(--radius-lg);padding:2rem;box-shadow:var(--shadow-lg);display:flex;gap:1rem;justify-content:center;flex-wrap:wrap}.cell{display:flex;align-items:center;gap:1rem;padding:1rem;border-radius:var(--radius);background:var(--light-color);min-width:200px}.cell-icon{font-size:2rem}.cell-content{flex:1}.cell-formula{font-family:Courier New,monospace;font-size:.875rem;color:var(--text-secondary);margin-bottom:.25rem}.cell-status{font-size:.75rem;color:var(--success-color);font-weight:600}.cell-value{font-weight:600;color:var(--text-primary)}.features-overview,.use-cases{padding:4rem 0}.section-title{font-size:2.5rem;font-weight:700;text-align:center;margin-bottom:1rem}.page-title{font-size:3rem;font-weight:800;text-align:center;margin-bottom:1rem}.page-subtitle{font-size:1.25rem;text-align:center;color:var(--text-secondary);margin-bottom:3rem}.features-grid,.use-cases-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:2rem;margin-top:3rem}.feature-card,.use-case{background:#fff;padding:2rem;border-radius:var(--radius-lg);box-shadow:var(--shadow-md);transition:transform .2s,box-shadow .2s}.feature-card:hover,.use-case:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}.feature-icon{font-size:3rem;margin-bottom:1rem}.feature-card h3,.use-case h3{font-size:1.5rem;margin-bottom:.5rem;color:var(--text-primary)}.feature-card p,.use-case p{color:var(--text-secondary);line-height:1.6}.cta-section{background:var(--primary-color);color:#fff;padding:4rem 0;text-align:center}.cta-section h2{font-size:2.5rem;margin-bottom:1rem}.cta-section p{font-size:1.25rem;margin-bottom:2rem;opacity:.9}.footer{background:var(--dark-color);color:#fff;padding:3rem 0 1rem}.footer-content{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:2rem;margin-bottom:2rem}.footer-section h3,.footer-section h4{margin-bottom:1rem}.footer-section ul{list-style:none}.footer-section li{margin-bottom:.5rem}.footer-section a{color:#ffffffb3;text-decoration:none;transition:color .2s}.footer-section a:hover{color:#fff}.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:1rem;text-align:center;color:#ffffff80}@media (max-width: 768px){.hero-title{font-size:2.5rem}.nav{gap:1rem}.features-grid,.use-cases-grid{grid-template-columns:1fr}.spreadsheet-preview{flex-direction:column}}