.pdf-flipbook-cover {
    cursor: pointer;
    transition: transform 0.2s;
}

.pdf-flipbook-cover:hover {
    transform: scale(1.05);
}

.pdf-flipbook-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.85);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.pdf-flipbook-inner {
    position: relative;
    width: 80%;
    height: 90%;
    background: #111;
    padding: 20px;
}

#flipbook {
    width: 100%;
    height: 100%;
}

.pdf-flipbook-close {
    position: absolute;
    top: 10px;
    right: 15px;
    font-size: 30px;
    color: #fff;
    cursor: pointer;
}

.pdf-flipbook-loader {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #fff;
}

.pdf-loader-spinner {
    width: 50px;
    height: 50px;
    border: 5px solid rgba(255,255,255,0.2);
    border-top: 5px solid #fff;
    border-radius: 50%;
    animation: pdfSpin 1s linear infinite;
    margin-bottom: 15px;
}

@keyframes pdfSpin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.pdf-loader-text {
    font-size: 16px;
}