:root{--bg-primary: #ffffff;--bg-secondary: #f9fafb;--bg-tertiary: #f3f4f6;--text-primary: #1f2937;--text-secondary: #6b7280;--text-tertiary: #9ca3af;--border: #e5e7eb;--border-light: #f3f4f6;--accent: #2563eb;--accent-hover: #1d4ed8;--accent-light: #dbeafe;--success: #10b981;--error: #ef4444;--radius: 8px}*,*:before,*:after{box-sizing:border-box}html,body{margin:0;padding:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,sans-serif;background:var(--bg-primary);color:var(--text-primary);line-height:1.6}body,#root{min-height:100vh}.app-shell{display:flex;flex-direction:column;min-height:100vh}.app-main{flex:1;width:100%;max-width:1024px;margin:0 auto;padding:60px 40px}@media (max-width: 768px){.app-main{padding:40px 20px}}.app-header{background:var(--bg-primary);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:10}.header-container{max-width:1024px;margin:0 auto;padding:20px 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textarea{min-height:120px;resize:vertical}.success-message{padding:12px 16px;background:#ecfdf5;color:#065f46;border-radius:var(--radius);font-size:14px;margin:0}.error-message{padding:12px 16px;background:#fef2f2;color:#991b1b;border-radius:var(--radius);font-size:14px;margin:0}.contact-info{background:var(--bg-secondary);padding:32px;border-radius:var(--radius);height:fit-content}.contact-info h3{margin-top:0}.contact-info p{color:var(--text-secondary);margin-bottom:12px}.contact-info code{background:var(--bg-primary);padding:4px 8px;border-radius:4px;font-family:Monaco,Courier New,monospace;font-size:13px;color:var(--accent)}.app-footer{background:var(--bg-secondary);border-top:1px solid var(--border);margin-top:auto}.footer-container{max-width:1024px;margin:0 auto;padding:40px;text-align:center}.app-footer p{font-size:14px;color:var(--text-secondary);margin:8px 0}@media (max-width: 768px){.hero-content h1{font-size:32px}.section h2{font-size:24px}.features-grid{grid-template-columns:1fr;gap:24px}.feature-card{padding:24px}}