body{margin:0;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background-color:azure;color:#111}header{position:fixed;top:0;left:0;width:100%;background-color:#53769d;padding:12px 32px;display:flex;justify-content:space-between;align-items:center;box-shadow:0 4px 5px #358299cc;z-index:999;box-sizing:border-box}.logo{display:flex;align-items:center;gap:12px;color:#fff}.logo img{width:60px;height:60px}header nav{display:flex;gap:24px}header nav a{color:#fff;text-decoration:none}header nav a:hover{text-decoration:underline;color:bisque}footer{background-color:#53769d;text-align:center;padding:10px;color:#fff;margin-top:50px}.buku-container{margin-top:140px}.buku-grid{display:flex;flex-wrap:wrap;justify-content:center;gap:35px}.buku-card{width:280px;background-color:#eaeaea;border-radius:16px;padding:24px;border:2px solid #2165a4;text-align:center;box-shadow:0 4px 9px #2b2b2b}.judul-buku{font-size:19px;font-weight:700;color:#111}.card-header{display:flex;justify-content:space-between}.buku-image{width:128px;height:192px;border-radius:8px;margin:16px auto;box-shadow:8px 8px #0000001a}.heart-button{background:none;border:none;cursor:pointer}.heart-icon.suka{fill:#ff0026;color:#ff0026}.heart-icon.tidak{fill:#fff;color:#000}.info-btn{background-color:#293f4f;color:#fff;padding:8px 19px;border-radius:8px;cursor:pointer;border:2px solid #444}.info-btn:hover{background-color:#848484}.popup{position:fixed;top:0;right:0;bottom:0;left:0;display:flex;justify-content:center;align-items:center;z-index:3000;background-color:#0006}.popup-content{background-color:#fff;border-radius:16px;width:90%;max-width:320px;padding:24px;text-align:center;box-shadow:0 8px 24px #00000026}.popup-content h2{font-size:20px;margin-bottom:16px}.popup-content img{width:128px;height:192px;object-fit:cover;margin-bottom:16px;border-radius:8px}.popup-content p{font-size:14px;margin:6px 0;text-align:left}.popup-content p strong{display:inline-block;width:100px}.popup-content button:last-child{margin-top:19px;background-color:#53769d;color:#fff;padding:6px 19px;border-radius:8px;cursor:pointer;font-size:14px}