.flipbook-viewer-container {
    position: relative;
    background: #2c2c2c;
    border-radius: 8px;
    overflow: hidden;
    margin: 20px auto;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.flipbook-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: #fff;
    gap: 15px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-left-color: #3498db;
    border-radius: 50%;
    animation: fb-spin 1s linear infinite;
}

@keyframes fb-spin {
    to { transform: rotate(360deg); }
}

.flipbook-canvas-container {
    width: 100%;
    height: calc(100% - 50px);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: auto; /* Enable scroll/panning when zoomed */
    background: #1a1a1a;
    position: relative;
}

/* StPageFlip Canvas Wrapper */
.stPageFlip {
    box-shadow: 0 0 20px rgba(0,0,0,0.5);
    transition: transform 0.2s ease; /* Smooth zoom transition */
}

.flipbook-toolbar {
    width: 100%;
    height: 50px;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    padding: 0 15px;
    box-sizing: border-box;
    z-index: 100;
}

.fb-btn {
    background: transparent;
    border: none;
    color: #ccc;
    cursor: pointer;
    padding: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    border-radius: 4px;
}

.fb-btn:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.1);
}

.fb-btn .dashicons {
    font-size: 20px;
    width: 20px;
    height: 20px;
}

.fb-page-info {
    color: #fff;
    margin: 0 15px;
    font-size: 14px;
    font-family: sans-serif;
    min-width: 60px;
    text-align: center;
}

.fb-spacer {
    flex-grow: 1;
}

/* Realistic Page Effects */
.fb-page {
    background-color: #fff;
    box-shadow: inset 3px 0 10px rgba(0,0,0,0.1);
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .flipbook-viewer-container {
        height: 500px !important;
    }
    
    .fb-page-info {
        margin: 0 5px;
    }
    
    .fb-btn {
        padding: 5px;
    }
}

/* Fullscreen Mode */
.flipbook-viewer-container:fullscreen {
    width: 100% !important;
    height: 100% !important;
    border-radius: 0;
}

.flipbook-viewer-container:-webkit-full-screen {
    width: 100% !important;
    height: 100% !important;
}