/* Viewer Styles - Shared by /view page */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    overflow: hidden;
    background: linear-gradient(135deg, #0f0f0f 0%, #1a1a1a 100%);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: white;
}

#loading {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    flex-direction: column;
    gap: 1rem;
}

#viewer-container {
    display: none;
    width: 100%;
    height: 100vh;
    position: relative;
    background: linear-gradient(135deg, #0f0f0f 0%, #1a1a1a 100%);
}

#viewer-container.active {
    display: flex;
    flex-direction: column;
}

#viewer-container:fullscreen {
    background: #0f0f0f;
}

#viewer-container:fullscreen .viewer-header {
    opacity: 0;
    transition: opacity 0.3s ease;
}

#viewer-container:fullscreen:hover .viewer-header {
    opacity: 1;
}

/* Viewer header */
.viewer-header {
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(20px);
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    z-index: 100;
}

.viewer-controls {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.control-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.875rem;
    font-weight: 500;
}

.control-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-1px);
}

.page-info {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.875rem;
    font-weight: 500;
}

/* Flipbook container */
.flipbook-wrapper {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 2rem;
    position: relative;
    z-index: 1;
}

#flipbook-container {
    position: relative;
    z-index: 1;
}

#flipbook-container .page {
    background: white;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

#flipbook-container .page canvas {
    width: 100%;
    height: 100%;
    object-fit: fill;  /* Fill the entire page without gaps */
    display: block;  /* Remove any inline spacing */
}

/* Thumbnail panel */
.thumbnail-panel {
    display: none;
    position: fixed;
    top: 80px;
    right: 20px;
    width: 300px;
    max-height: calc(100vh - 100px);
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 15px;
    z-index: 1000;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 1rem;
}

/* Mobile Responsive Styles */
@media (max-width: 768px) {
    .viewer-header {
        padding: 0.75rem 1rem;
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .viewer-controls {
        width: 100%;
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .viewer-controls > div {
        display: flex;
        justify-content: center;
        flex-wrap: wrap;
        gap: 0.5rem;
        width: 100%;
    }
    
    .control-btn {
        padding: 0.5rem;
        font-size: 1rem;
        min-width: 44px;
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .page-info {
        text-align: center;
        font-size: 0.8rem;
    }
    
    .flipbook-wrapper {
        padding: 0.5rem;
    }
    
    .thumbnail-panel {
        top: auto;
        bottom: 0;
        right: 0;
        left: 0;
        width: 100%;
        max-height: 50vh;
        border-radius: 15px 15px 0 0;
        border-bottom: none;
    }
}

/* Mobile Fullscreen Support */
@media (max-width: 768px) {
    #viewer-container:fullscreen .viewer-header,
    #viewer-container:-webkit-full-screen .viewer-header,
    #viewer-container:-moz-full-screen .viewer-header {
        opacity: 1;
        position: sticky;
        top: 0;
    }
    
    #viewer-container:fullscreen .flipbook-wrapper,
    #viewer-container:-webkit-full-screen .flipbook-wrapper,
    #viewer-container:-moz-full-screen .flipbook-wrapper {
        padding: 0.25rem;
    }
}

.thumbnail-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.thumbnail-grid.book-mode {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    width: 100%;
}

.thumbnail-row {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    align-items: flex-start;
    width: 100%;
}

.thumbnail-row .thumbnail-item {
    flex: 0 1 auto;
    max-width: 48%;
    min-width: 0;
}

.thumbnail-row .thumbnail-item:only-child {
    max-width: 60%;
}

.thumbnail-item {
    position: relative;
    cursor: pointer;
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.2s ease;
}

.thumbnail-item:hover {
    border-color: rgba(255, 255, 255, 0.5);
    transform: scale(1.05);
}

.thumbnail-item.active {
    border-color: #3b82f6;
    box-shadow: 0 0 15px rgba(59, 130, 246, 0.5);
}

.thumbnail-item canvas {
    width: 100%;
    display: block;
}

.thumbnail-label {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.8);
    padding: 0.25rem;
    text-align: center;
    font-size: 0.75rem;
}