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.feature-card .feature-icon-wrapper .feature-icon{font-size:2.5rem;color:var(--feature-color);transition:all .3s ease}.features-section .feature-card .feature-title{font-size:1.5rem;font-weight:700;color:#1e293b;margin-bottom:1rem;position:relative;z-index:2}.features-section .feature-card .feature-description{font-size:1rem;color:#64748b;line-height:1.7;position:relative;z-index:2;flex-grow:1}.testimonials-section{background:linear-gradient(135deg,#f8fafc,#e2e8f0)}.testimonials-section .testimonials-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(350px,1fr));gap:2rem;max-width:1200px;margin:0 auto;padding:0 2rem}.testimonials-section .testimonial-card{background:#fff;border-radius:20px;padding:2.5rem;border:1px solid rgba(0,0,0,.06);transition:all .3s ease;position:relative;overflow:hidden}.testimonials-section .testimonial-card:before{content:'"';position:absolute;top:1rem;left:2rem;font-size:4rem;color:#667eea15;font-family:serif;line-height:1}.testimonials-section 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.author-role{font-size:.875rem;color:#64748b}.cta-section{background:linear-gradient(135deg,#1a1a1a,#2d2d2d);color:#fff;position:relative;overflow:hidden}.cta-section:before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 20% 80%,rgba(102,126,234,.1) 0%,transparent 50%),radial-gradient(circle at 80% 20%,rgba(118,75,162,.1) 0%,transparent 50%)}.cta-section .cta-content{text-align:center;max-width:700px;margin:0 auto;padding:0 2rem;position:relative;z-index:1}.cta-section .cta-content .cta-title{font-size:clamp(2rem,5vw,3rem);font-weight:800;margin-bottom:1.5rem;line-height:1.2}.cta-section .cta-content .cta-subtitle{font-size:1.25rem;opacity:.9;margin-bottom:3rem;line-height:1.6}.cta-section .cta-content .cta-buttons{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap}@media (max-width: 768px){.stats-section .stats-grid{grid-template-columns:repeat(2,1fr);gap:1.5rem;padding:0 1rem}.features-section .features-grid{grid-template-columns:1fr;gap:2rem;padding:0 1rem}.features-section .feature-card{padding:2rem 1.5rem}.testimonials-section .testimonials-grid{grid-template-columns:1fr;gap:1.5rem;padding:0 1rem}.cta-section .cta-content{padding:0 1rem}.cta-section .cta-content .cta-buttons{flex-direction:column;align-items:center}}@media (max-width: 480px){.stats-section .stats-grid{grid-template-columns:1fr}.stats-section .stat-card{padding:2rem 1.5rem}}.books-page{min-height:100vh;background:#fff}@media (max-width: 768px){.books-page .book-card .MuiCardContent-root>.MuiBox-root:first-of-type{flex-direction:column;gap:1.5rem;text-align:center}.books-page .book-card .MuiCardContent-root>.MuiBox-root:first-of-type .MuiBox-root:first-of-type{align-self:center}.books-page .book-card .MuiCardContent-root>.MuiBox-root:first-of-type .MuiBox-root:nth-of-type(2){text-align:left}}.add-book-page{min-height:100vh;background:#fafafa}.add-book-page .page-container{max-width:600px;margin:0 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.form-actions{display:flex;justify-content:flex-end;gap:1rem;padding:0 2rem}.add-book-page .form-actions .action-button{min-width:120px;height:44px;border-radius:8px;font-weight:600;text-transform:none;font-size:.95rem;transition:all .2s ease}.add-book-page .form-actions .action-button.secondary{background:#fff;border:1px solid #d1d5db;color:#64748b}.add-book-page .form-actions .action-button.secondary:hover{background:#f8fafc;border-color:#9ca3af}.add-book-page .form-actions .action-button.primary{background:#0f172a;color:#fff;box-shadow:0 1px 2px #0000000d}.add-book-page .form-actions .action-button.primary:hover{background:#1e293b;box-shadow:0 4px 6px -1px #0000001a;transform:translateY(-1px)}.add-book-page .form-actions .action-button.primary:disabled{background:#94a3b8;transform:none;box-shadow:none}@media (max-width: 640px){.add-book-page .form-actions{flex-direction:column;padding:0 1rem}.add-book-page .form-actions .action-button{width:100%}}.add-book-page 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.stat-card{margin-bottom:1rem}}*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth}body{font-family:Inter,Segoe UI,Tahoma,Geneva,Verdana,sans-serif;line-height:1.6;overflow-x:hidden;transition:background-color .3s ease,color .3s ease}.app{min-height:100vh;display:flex;flex-direction:column}.main-content{flex:1}.main-content.auth-page{min-height:100vh;padding-top:0}button{font-family:inherit;cursor:pointer}a{color:inherit;text-decoration:none}input,textarea,select{font-family:inherit}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:#f1f1f1}::-webkit-scrollbar-thumb{background:linear-gradient(135deg,#667eea,#764ba2);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:linear-gradient(135deg,#5a6fd8,#6a4190)}::selection{background:#667eea33;color:#333}::-moz-selection{background:#667eea33;color:#333}*:focus{outline:2px solid 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