/*
FILENAME: cg-bookshelf.css
CG-BookShelf
File-Description: Complete bookshelf styling with realistic wood grain, preloader, and 3D support.
License: Proprietary.
(C) The CollabGadget Co. / All Rights Reserved.
*/

/* ==== CSS Variables for Shelf Colors ==== */
:root {
    --cg-shelf-base: #d3a15d;      /* Maple default */
    --cg-shelf-highlight: #f0c98b; /* Lighter streaks */
    --cg-shelf-shadow: #b38c5e;    /* Dark streaks */
}

/* ==== GENERAL BOOKSHELF STYLES ==== */

/* Bookshelf Wrapper */
.cg-bookshelf-wrapper {
    position: relative;
    padding: 40px;
    background: #f5f2e9;
    overflow: hidden;
    min-height: 400px;
}

.cg-book-detail-3d {
    width: 300px;
    height: 450px;
    perspective: 1000px;
}


.cg-book-3d {
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    border-radius: 6px;
    transform-style: preserve-3d;
    transform: rotateY(0deg) rotateX(0deg);
    transition: transform 0.5s ease;
}

.cg-book-3d:hover {
    transform: rotateY(10deg) rotateX(2deg);
}

/* 3D Mode specific wrapper */
.cg-bookshelf-wrapper[data-mode="3d"] {
    padding: 20px;
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
}

.cg-bookshelf-wrapper[data-mode="3d"] canvas {
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

/* ==== 2D BOOKSHELF STYLES ==== */

/* Shelf background with pure CSS wood grain */
.cg-bookshelf-shelf {
    display: flex;
    align-items: flex-end;
    padding: 30px 0;
    perspective: 1500px;
    position: relative;
    border-radius: 4px;

    /* Base wood color */
    background-color: var(--cg-shelf-base);

    /* Grain streaks and highlights */
    background-image: 
        repeating-linear-gradient(
            90deg,
            var(--cg-shelf-shadow),
            var(--cg-shelf-shadow) 1px,
            var(--cg-shelf-base) 2px,
            var(--cg-shelf-base) 6px
        ),
        linear-gradient(
            to bottom,
            var(--cg-shelf-highlight) 0%,
            var(--cg-shelf-base) 50%,
            var(--cg-shelf-shadow) 100%
        );
    box-shadow: inset 0 4px 12px rgba(0,0,0,0.3);
}

/* Optional knots for more realism */
.cg-bookshelf-shelf::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle, rgba(0,0,0,0.1) 2%, transparent 2%) 20px 30px / 40px 40px repeat,
        radial-gradient(circle, rgba(0,0,0,0.08) 2%, transparent 2%) 60px 70px / 50px 50px repeat;
    pointer-events: none;
    opacity: 0.3;
}

/* ==== 2D Books on the shelf ==== */
.cg-bookshelf-book {
    position: relative;
    width: 140px;
    height: 210px;
    margin: 0 15px;
    background-size: cover;
    background-position: center;
    box-shadow: 0 8px 18px rgba(0,0,0,0.4);
    transform: rotateY(-10deg) translateZ(0);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border-radius: 4px;
    cursor: pointer;
}

.cg-bookshelf-book:hover {
    transform: rotateY(0) scale(1.05);
    box-shadow: 0 12px 22px rgba(0,0,0,0.6);
}

/* Shine effect */
.cg-bookshelf-book::after {
    content: '';
    position: absolute;
    top: 0;
    left: -50%;
    width: 200%;
    height: 100%;
    background: linear-gradient(120deg, rgba(255,255,255,0.3) 0%, transparent 60%);
    transform: skewX(-25deg);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.cg-bookshelf-book:hover::after {
    opacity: 1;
    animation: shine 1s forwards;
}

@keyframes shine {
    from { transform: translateX(-100%) skewX(-25deg); }
    to   { transform: translateX(100%) skewX(-25deg); }
}

/* ==== Slider row ==== */
.cg-bookshelf-slider {
    display: flex;
    gap: 20px;
    overflow-x: auto;
    scroll-behavior: smooth;
    padding-bottom: 20px;
    scrollbar-width: thin;
    scrollbar-color: var(--cg-shelf-base) transparent;
}

.cg-bookshelf-slider::-webkit-scrollbar {
    height: 8px;
}

.cg-bookshelf-slider::-webkit-scrollbar-track {
    background: transparent;
}

.cg-bookshelf-slider::-webkit-scrollbar-thumb {
    background: var(--cg-shelf-base);
    border-radius: 4px;
}

.cg-bookshelf-slider::-webkit-scrollbar-thumb:hover {
    background: var(--cg-shelf-shadow);
}

/* Dragging state */
.cg-bookshelf-slider.dragging {
    cursor: grabbing;
    scroll-behavior: auto;
}

/* Individual book container */
.cg-book {
    position: relative;
    flex: 0 0 auto;
    width: 150px;
    perspective: 800px;
}

.cg-book-cover {
    position: relative;
    width: 100%;
    height: 220px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.5);
    overflow: hidden;
    transform-style: preserve-3d;
    transition: transform 0.4s ease;
    border-radius: 4px;
    background-size: cover;
    background-position: center;
}

.cg-book:hover .cg-book-cover {
    transform: rotateY(15deg) translateY(-5px);
}

.cg-book-shine {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(120deg, rgba(255,255,255,0.4), transparent 60%);
    transform: skewX(-20deg);
    opacity: 0;
    transition: opacity 0.4s ease;
    pointer-events: none;
}

.cg-book:hover .cg-book-shine {
    opacity: 1;
}

.cg-book-title {
    text-align: center;
    margin-top: 10px;
    font-weight: bold;
    font-size: 14px;
    color: #333;
    line-height: 1.3;
    padding: 0 5px;
}

.cg-book-meta {
    text-align: center;
    margin-top: 5px;
    font-size: 12px;
    color: #666;
    line-height: 1.2;
}

/* ==== Preloader shimmer (Instagram-style) ==== */
.cg-preloader {
    display: flex;
    gap: 20px;
    padding: 30px 0;
}

.cg-preloader .book-placeholder {
    width: 140px;
    height: 210px;
    border-radius: 4px;
    background: linear-gradient(
        90deg,
        #e0e0e0 25%,
        #f5f5f5 37%,
        #e0e0e0 63%
    );
    background-size: 400% 100%;
    animation: shimmer 1.4s ease infinite;
}

@keyframes shimmer {
    0% { background-position: -400px 0; }
    100% { background-position: 400px 0; }
}

/* ==== 3D BOOKSHELF SPECIFIC STYLES ==== */
.cg-bookshelf-wrapper[data-mode="3d"] .cg-preloader,
.cg-bookshelf-wrapper[data-mode="3d"] .cg-bookshelf-slider,
.cg-bookshelf-wrapper[data-mode="3d"] .cg-bookshelf-shelf {
    display: none;
}


/* 3D Loading indicator */
.cg-bookshelf-3d-loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: #fff;
    font-size: 16px;
    z-index: 10;
}

.cg-bookshelf-3d-loading::after {
    content: '';
    display: block;
    width: 40px;
    height: 40px;
    margin: 10px auto;
    border: 3px solid transparent;
    border-top: 3px solid #fff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ==== RESPONSIVE DESIGN ==== */
@media (max-width: 768px) {
    .cg-bookshelf-wrapper {
        padding: 20px;
    }
    
    .cg-bookshelf-book,
    .cg-preloader .book-placeholder {
        width: 100px;
        height: 150px;
        margin: 0 8px;
    }
    
    .cg-book {
        width: 120px;
    }
    
    .cg-book-cover {
        height: 180px;
    }
    
    .cg-book-title {
        font-size: 12px;
    }
    
    .cg-bookshelf-slider {
        gap: 15px;
    }
}

@media (max-width: 480px) {
    .cg-bookshelf-wrapper {
        padding: 15px;
    }
    
    .cg-bookshelf-book,
    .cg-preloader .book-placeholder {
        width: 80px;
        height: 120px;
        margin: 0 5px;
    }
    
    .cg-book {
        width: 100px;
    }
    
    .cg-book-cover {
        height: 140px;
    }
    
    .cg-bookshelf-slider {
        gap: 10px;
    }
}

/* ==== ACCESSIBILITY ==== */
@media (prefers-reduced-motion: reduce) {
    .cg-bookshelf-book,
    .cg-book-cover,
    .cg-book-shine {
        transition: none;
    }
    
    .cg-preloader .book-placeholder {
        animation: none;
        background: #e0e0e0;
    }
    
    @keyframes shine,
    @keyframes shimmer,
    @keyframes spin {
        animation-duration: 0s;
    }
}

/* Focus states for accessibility */
.cg-book:focus,
.cg-bookshelf-book:focus {
    outline: 2px solid #007cba;
    outline-offset: 2px;
}

/* Print styles */
@media print {
    .cg-bookshelf-wrapper {
        background: none;
        box-shadow: none;
    }
    
    .cg-preloader {
        display: none;
    }
    
    .cg-bookshelf-book::after,
    .cg-book-shine {
        display: none;
    }
}