/* Premium 3D Flipbook Viewer Styles */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&display=swap');

:root {
    --fb-bg-dark: #0f172a;
    --fb-bg-light: #f8fafc;
    --fb-panel-dark: rgba(30, 41, 59, 0.7);
    --fb-panel-light: rgba(255, 255, 255, 0.85);
    --fb-text-dark: #f1f5f9;
    --fb-text-light: #0f172a;
    --fb-accent: #f59e0b; /* Amber gold for highlights */
    --fb-accent-rgb: 245, 158, 11;
    --fb-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
    --fb-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.premium-flipbook-container {
    font-family: 'Outfit', sans-serif;
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 1200px;
    height: 750px;
    margin: 20px auto;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--fb-shadow);
    position: relative;
    transition: var(--fb-transition);
}

/* Theme Options */
.premium-flipbook-container.theme-dark {
    background-color: var(--fb-bg-dark);
    color: var(--fb-text-dark);
}
.premium-flipbook-container.theme-light {
    background-color: var(--fb-bg-light);
    color: var(--fb-text-light);
}

/* Premium Toolbar */
.premium-flipbook-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 25px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    z-index: 10;
}

.theme-dark .premium-flipbook-toolbar {
    background-color: var(--fb-panel-dark);
}
.theme-light .premium-flipbook-toolbar {
    background-color: var(--fb-panel-light);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

/* Buttons styling */
.tb-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    color: inherit;
    padding: 10px;
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: var(--fb-transition);
    margin: 0 4px;
    outline: none;
}

.theme-dark .tb-btn:hover {
    background-color: rgba(255, 255, 255, 0.06);
    color: var(--fb-accent);
}
.theme-light .tb-btn:hover {
    background-color: rgba(0, 0, 0, 0.04);
    color: var(--fb-accent);
}

.tb-btn.active {
    background-color: var(--fb-accent) !important;
    color: #000 !important;
    box-shadow: 0 0 15px rgba(var(--fb-accent-rgb), 0.4);
}

.tb-btn span {
    font-size: 20px;
    width: 20px;
    height: 20px;
}

.page-indicator {
    font-size: 14px;
    font-weight: 500;
    margin: 0 10px;
    opacity: 0.8;
}

.book-title {
    font-weight: 600;
    font-size: 16px;
    letter-spacing: 0.5px;
}

/* Viewport Stage */
.premium-flipbook-viewport {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
    padding: 20px;
}

.premium-flipbook-canvas-wrapper {
    display: flex;
    position: relative;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.55);
    border-radius: 8px;
    overflow: hidden;
    transform-origin: center center;
    transition: transform 0.2s ease-out;
}

.flipbook-page-container {
    position: relative;
    background: #fff;
}

.flipbook-page-container canvas {
    display: block;
    max-height: 100%;
}

.flipbook-page-container .drawing-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 5;
    pointer-events: none;
    cursor: crosshair;
}

.premium-flipbook-container.drawing-mode .drawing-canvas {
    pointer-events: auto;
}

/* Fullscreen styling */
.premium-flipbook-container:fullscreen {
    max-width: none !important;
    width: 100% !important;
    height: 100% !important;
    border-radius: 0 !important;
}

.premium-flipbook-container:-webkit-full-screen {
    max-width: none !important;
    width: 100% !important;
    height: 100% !important;
    border-radius: 0 !important;
}