.bookshelf{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:20px;margin-top:20px;min-height:400px;}.book-item{background-color:#fff;border-radius:8px;overflow:hidden;box-shadow:0 2px 8px rgba(0,0,0,0.1);transition:transform 0.3s,box-shadow 0.3s;cursor:pointer;}.book-item:hover{transform:translateY(-5px);box-shadow:0 8px 16px rgba(0,0,0,0.15);}.book-cover{width:100%;height:220px;object-fit:cover;display:block;}.book-info{padding:12px;}.book-title{font-size:16px;font-weight:500;margin-bottom:5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}.book-author{font-size:14px;color:#666;margin-bottom:8px;}.book-details{display:flex;justify-content:space-between;font-size:12px;color:#999;}.empty-bookshelf{display:flex;flex-direction:column;align-items:center;justify-content:center;grid-column:1 / -1;padding:50px 0;text-align:center;background-color:#fff;border-radius:12px;box-shadow:0 2px 10px rgba(0,0,0,0.05);min-height:400px;}.empty-bookshelf img{width:180px;margin-bottom:20px;opacity:0.8;animation:float 3s ease-in-out infinite;}@keyframes float{0%{transform:translateY(0px);}50%{transform:translateY(-10px);}100%{transform:translateY(0px);}}.empty-bookshelf p{font-size:16px;color:#666;margin-bottom:10px;}.empty-bookshelf .login-tip{font-size:14px;color:#999;margin-bottom:20px;}.empty-bookshelf .button-container{display:flex;gap:15px;margin-top:10px;}.empty-bookshelf .login-link,.empty-bookshelf .explore-link{display:inline-block;padding:8px 20px;border-radius:20px;text-decoration:none;font-size:14px;transition:all 0.3s;}.empty-bookshelf .login-link{background-color:#f0f0f0;color:#666;}.empty-bookshelf .explore-link{background-color:#5D9968;color:#fff;}.empty-bookshelf .login-link:hover{background-color:#e5e5e5;transform:translateY(-2px);}.empty-bookshelf .explore-link:hover{background-color:#4C8055;transform:translateY(-2px);}.error-message{grid-column:1 / -1;background-color:#fff8f8;border:1px solid #ffebeb;border-radius:8px;padding:30px;text-align:center;color:#f44336;}.error-message i{font-size:48px;margin-bottom:15px;}.error-message p{font-size:16px;margin-bottom:20px;}.error-message button{background-color:#5D9968;color:white;border:none;padding:8px 20px;border-radius:4px;cursor:pointer;font-size:14px;transition:background-color 0.3s;}.error-message button:hover{background-color:#4C8055;}.main-content{margin-top:0;padding:30px 0;background-color:#f8f8f8;min-height:calc(100vh - 60px);}@media (max-width:768px){.bookshelf{grid-template-columns:repeat(2,1fr);gap:15px;}.book-cover{height:180px;}.empty-bookshelf .button-container{flex-direction:column;gap:10px;}}