/**
 * Book Reader Styles - StPageFlip In-Place Animation
 * v4 - State-based centering + maximize size
 */

/* ==========================================================================
   CSS Variables
   ========================================================================== */

:root {
    --book-page-ratio: 0.65;
    --book-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    --book-page-color: #f8f5ed;
    --book-transition-duration: 0.4s;
    --book-transition-easing: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================================================
   Book Stage - Centers the book, provides available space
   ========================================================================== */

.book-stage {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    max-width: 85vw;
    max-height: 80vh;
    /* No padding - container already has padding */
    overflow: visible;
}

/* ==========================================================================
   Book Wrapper - Handles translateX for centering different states
   ========================================================================== */

.book-wrapper {
    position: relative;
    height: 100%;
    transition: transform var(--book-transition-duration) var(--book-transition-easing);
}

/* ==========================================================================
   Book Container
   ========================================================================== */

.book-container {
    position: relative;
    height: 100%;
}

/* ==========================================================================
   Book Cover - Closed State (clickable)
   ========================================================================== */

.book-cover {
    position: relative;
    cursor: pointer;
    transition: transform 0.3s ease;
    height: 100%;
    display: flex;
    align-items: center;

    /* 3D perspective tilt */
    transform-style: preserve-3d;
    transform: perspective(1000px) rotateY(-5deg);
}

.book-cover:hover {
    transform: perspective(1000px) rotateY(-10deg) translateY(-5px);
}

.book-cover img {
    display: block;
    max-height: 100%;
    width: auto;
    object-fit: contain;
    box-shadow: var(--book-shadow);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* Click hint - inside image, not below */
.book-cover-hint {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    font-size: var(--font-size-sm);
    color: #fff;
    background: rgba(0, 0, 0, 0.7);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    opacity: 0;
    transition: opacity 0.3s ease;
    white-space: nowrap;
}

.book-cover:hover .book-cover-hint {
    opacity: 1;
}

/* Hide cover when book is open */
.book-wrapper.is-open .book-cover {
    display: none;
}

/* ==========================================================================
   Flipbook - StPageFlip container
   ========================================================================== */

.book-flipbook {
    display: none;
}

.book-wrapper.is-open .book-flipbook {
    display: block;
}

/* Page styling for StPageFlip */
.book-flipbook .page {
    background: var(--book-page-color);
    box-shadow: inset 0 0 30px rgba(0, 0, 0, 0.05);
    overflow: hidden;
}

.book-flipbook .page img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    background: var(--book-page-color);
}

/* Cover pages styling */
.book-flipbook .page-cover {
    background: linear-gradient(135deg, #3a2a1a 0%, #2a1f1a 100%);
}

.book-flipbook .page-cover img {
    object-fit: cover;
}

/* ==========================================================================
   Book Controls
   ========================================================================== */

.book-controls {
    display: none;
    justify-content: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) 0;
}

.book-entry.is-reading .book-controls {
    display: flex;
}

.book-controls button {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-full);
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
    font-size: var(--font-size-xl);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.book-controls button:hover {
    background: var(--color-accent);
    color: var(--color-bg-primary);
    border-color: var(--color-accent);
    transform: scale(1.1);
}

.book-controls button:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* ==========================================================================
   Responsive - Mobile
   ========================================================================== */

@media (max-width: 767px), (orientation: portrait) {
    .book-cover img {
        max-width: 90vw;
    }

    .book-controls button {
        width: 44px;
        height: 44px;
        font-size: var(--font-size-lg);
    }
}

/* ==========================================================================
   Reduced Motion
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
    .book-wrapper,
    .book-cover,
    .book-controls button {
        transition: none;
    }

    .book-cover:hover {
        transform: perspective(1000px) rotateY(-5deg);
    }
}

/* ==========================================================================
   StPageFlip Overrides
   ========================================================================== */

/* Library container - remove any default margins */
.stf__parent {
    margin: 0 !important;
}

/* Shadow on individual pages - hidden page = no shadow */
.stf__item.--left.--simple {
    box-shadow: -5px 5px 20px rgba(0, 0, 0, 0.3);
}

.stf__item.--right.--simple {
    box-shadow: 5px 5px 20px rgba(0, 0, 0, 0.3);
}