/* assets/css/book-cards.css */
/* 3D Book Card Container */
.book-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 40px;
    justify-content: center;
    padding: 40px 0;
}

.book-card-wrapper {
    perspective: 1500px;
    margin-bottom: 50px;
    display: flex;
    justify-content: center;
}

.book-card {
    position: relative;
    width: 280px;
    height: 400px;
    transform-style: preserve-3d;
    transform: rotateY(-20deg) rotateX(10deg);
    transition: transform 0.6s ease;
    cursor: pointer;
    box-shadow: -10px 20px 30px rgba(0,0,0,0.2);
    border-radius: 4px 8px 8px 4px;
}

.book-card:hover {
    transform: rotateY(0deg) rotateX(0deg) scale(1.05);
    box-shadow: 0px 20px 40px rgba(0,0,0,0.3);
}

.book-card .book-front, 
.book-card .book-spine {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    transform-style: preserve-3d;
    backface-visibility: hidden;
    border-radius: 4px 8px 8px 4px;
}

.book-card .book-front {
    width: 100%;
    background-color: var(--theme-color, #1a237e);
    z-index: 2;
    transform: translateZ(15px);
    display: flex;
    flex-direction: column;
    padding: 30px 20px;
    color: #fff;
    border-left: 3px solid rgba(255,255,255,0.3);
    background-image: linear-gradient(90deg, rgba(255,255,255,0.1) 0%, transparent 10%);
    overflow: hidden;
}

/* Geometric pattern overlay for the book cover */
.book-card .book-front::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image: linear-gradient(45deg, rgba(255,255,255,0.05) 25%, transparent 25%, transparent 75%, rgba(255,255,255,0.05) 75%, rgba(255,255,255,0.05)),
                      linear-gradient(45deg, rgba(255,255,255,0.05) 25%, transparent 25%, transparent 75%, rgba(255,255,255,0.05) 75%, rgba(255,255,255,0.05));
    background-size: 20px 20px;
    background-position: 0 0, 10px 10px;
    opacity: 0.5;
    z-index: -1;
}

.book-card .book-spine {
    width: 30px;
    background-color: var(--theme-color-dark, #0d1245);
    transform: rotateY(-90deg) translateZ(15px);
    transform-origin: left;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: bold;
    letter-spacing: 2px;
    border-radius: 4px 0 0 4px;
    box-shadow: inset -5px 0 10px rgba(0,0,0,0.3);
}

.book-card .book-spine-text {
    transform: rotate(-90deg);
    white-space: nowrap;
    text-transform: uppercase;
    font-size: 14px;
    opacity: 0.8;
}

/* Book pages edge */
.book-card .book-pages {
    position: absolute;
    top: 5px;
    bottom: 5px;
    right: -14px;
    width: 14px;
    background: #f0f0f0;
    transform: rotateY(90deg);
    transform-origin: right;
    border-radius: 0 4px 4px 0;
    box-shadow: inset 2px 0 5px rgba(0,0,0,0.1);
    background-image: repeating-linear-gradient(to right, #fff, #fff 1px, #e0e0e0 1px, #e0e0e0 2px);
    z-index: 1;
}

/* Book pages bottom edge */
.book-card .book-pages-bottom {
    position: absolute;
    bottom: -14px;
    left: 2px;
    right: 2px;
    height: 14px;
    background: #e0e0e0;
    transform: rotateX(-90deg);
    transform-origin: bottom;
    background-image: repeating-linear-gradient(to bottom, #fff, #fff 1px, #d0d0d0 1px, #d0d0d0 2px);
    border-radius: 0 0 4px 4px;
    z-index: 1;
}

/* Content inside the book */
.book-badge {
    background: var(--accent-color, #ffb300);
    color: #000;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 700;
    align-self: flex-start;
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.book-title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 10px;
    line-height: 1.3;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: #fff;
}

.book-subtitle {
    font-size: 13px;
    font-weight: 400;
    opacity: 0.8;
    margin-bottom: auto;
    line-height: 1.5;
    color: #e0e0e0;
}

.book-author {
    font-size: 13px;
    font-weight: 600;
    margin-top: 20px;
    color: #fff;
    display: flex;
    align-items: center;
    gap: 10px;
}

.book-author::before {
    content: '';
    display: block;
    width: 30px;
    height: 2px;
    background-color: var(--accent-color, #ffb300);
}

.book-footer {
    display: flex;
    flex-direction: column;
    margin-top: 20px;
}

.book-btn {
    display: inline-block;
    padding: 10px 0;
    background-color: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.3);
    color: #fff;
    text-decoration: none;
    border-radius: 4px;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.3s ease;
    text-align: center;
    backdrop-filter: blur(5px);
}

.book-btn:hover {
    background-color: #fff;
    color: var(--theme-color-dark, #0d1245);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

/* Color variations */
.book-blue {
    --theme-color: #1e3c72;
    --theme-color-dark: #122446;
    --accent-color: #ffd700;
}

.book-red {
    --theme-color: #8E0E00;
    --theme-color-dark: #580900;
    --accent-color: #ffb300;
}

.book-green {
    --theme-color: #11998e;
    --theme-color-dark: #0a5f58;
    --accent-color: #f2c94c;
}

.book-purple {
    --theme-color: #4776E6;
    --theme-color-dark: #2a4aa1;
    --accent-color: #0cebeb;
}

.book-dark {
    --theme-color: #232526;
    --theme-color-dark: #111112;
    --accent-color: #e0e0e0;
}