.toast{position:fixed;bottom:20px;right:20px;padding:1rem;border-radius:4px;display:flex;align-items:center;gap:1rem;animation:slideIn .3s ease;z-index:1000}.toast-success{background-color:#2ecc71;color:#fff}.toast-error{background-color:#e74c3c;color:#fff}.toast-warning{background-color:#f1c40f;color:#000}.toast-close{background:none;border:none;color:inherit;cursor:pointer;font-size:1.2rem;padding:0;opacity:.8;transition:opacity .3s ease}.toast-close:hover{opacity:1}@keyframes slideIn{0%{transform:translate(100%);opacity:0}to{transform:translate(0);opacity:1}}.navbar{background-color:#2c3e50;padding:1rem 2rem;position:fixed;top:0;left:0;right:0;z-index:1000;box-shadow:0 2px 4px #0000001a;height:80px}.nav-container{max-width:1200px;margin:0 auto;display:flex;justify-content:space-between;align-items:center;height:100%}.nav-left,.nav-center,.nav-right{display:flex;align-items:center;gap:1.5rem}.nav-brand{color:#fff;font-size:1.5rem;font-weight:700;text-decoration:none;transition:color 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#0000001a;margin-bottom:2rem;padding:2rem;display:flex;align-items:center;gap:2rem;position:relative;overflow:hidden}.popular-book-rank{display:flex;flex-direction:column;align-items:center;justify-content:center;min-width:80px;height:80px;background:#3498db;color:#fff;border-radius:50%;position:relative;z-index:1}.rank-number{font-size:2rem;font-weight:700;line-height:1}.rank-label{font-size:.8rem;text-transform:uppercase}.popular-book-content{display:flex;gap:2rem;flex:1}.popular-book-image{flex:0 0 200px}.popular-book-image img{width:100%;height:300px;object-fit:cover;border-radius:8px;box-shadow:0 2px 4px #0000001a}.popular-book-info{flex:1}.popular-book-info h3{font-size:1.5rem;color:#2c3e50;margin-bottom:1rem}.popular-book-info p{margin-bottom:.5rem;color:#666}.popular-book-info .author{font-weight:500;color:#3498db}.popular-book-info .category{font-style:italic}.popular-book-info .description{margin:1rem 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p{font-size:1.2rem;color:#666;margin-bottom:2rem}.home-link{display:inline-block;padding:.8rem 1.5rem;background-color:#3498db;color:#fff;text-decoration:none;border-radius:4px;transition:background-color .3s}.home-link:hover{background-color:#2980b9}.App{text-align:center}.App-logo{height:40vmin;pointer-events:none}@media (prefers-reduced-motion: no-preference){.App-logo{animation:App-logo-spin infinite 20s linear}}.App-header{background-color:#282c34;min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;font-size:calc(10px + 2vmin);color:#fff}.App-link{color:#61dafb}@keyframes App-logo-spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.app{min-height:100vh;display:flex;flex-direction:column}main{flex:1;padding-top:80px;padding-bottom:2rem;width:100%;max-width:1200px;margin:0 auto;padding-left:1rem;padding-right:1rem}@media (max-width: 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