/* #region Chapters Page Layout */
main {
    display: flex;
    flex-direction: column;
    align-items: center;
}

#chapters-container {
    width: 90vw;
    max-width: 800px;
    margin-bottom: 2em;
}

#chapters-title {
    font-size: 28px;
    color: var(--primary-light-color);
    background-color: black;
    text-align: center;
    padding: 10px;
    margin-bottom: 1em;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
}

#last-updated {
    font-size: 16px;
    color: var(--primary-light-color);
    background-color: black;
    text-align: center;
    padding: 5px;
    margin-bottom: 1em;
}

#loading {
    text-align: center;
    color: var(--primary-light-color);
    font-size: 22px;
    padding: 2em;
}
/* #endregion */

/* #region Chapter Accordion */
.chapter-section {
    margin-bottom: 1em;
}

.chapter-header {
    background-color: black;
    color: var(--primary-light-color);
    padding: 12px 16px;
    cursor: pointer;
    font-size: 22px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 2px solid var(--complementary-color);
    transition: background-color 0.2s ease;
}

.chapter-header:hover {
    background-color: #1a1a1a;
}

.chapter-header .arrow {
    transition: transform 0.3s ease;
    font-size: 16px;
}

.chapter-header.open .arrow {
    transform: rotate(90deg);
}

.chapter-pages {
    display: none;
    background-color: #D2D2D2;
    border: 2px solid black;
    border-top: none;
    padding: 12px;
}

.chapter-pages.open {
    display: block;
}
/* #endregion */

/* #region Pages Grid */
.pages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 12px;
}

.page-card {
    background-color: #f0f0f0;
    border: 2px solid #000;
    border-radius: 5px;
    cursor: pointer;
    text-decoration: none;
    color: black;
    overflow: hidden;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    display: flex;
    flex-direction: column;
}

.page-card:hover {
    transform: scale(1.03);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
    border-color: var(--complementary-color);
}

.page-card:active {
    transform: scale(0.98);
}

.page-card-thumb {
    width: 100%;
    aspect-ratio: 1 / 1;
    background-color: #ccc;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

.page-card-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.page-card-thumb .thumb-placeholder {
    font-size: 36px;
    color: #888;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
}

.page-card-thumb .video-badge {
    font-size: 14px;
    color: #fff;
    background-color: rgba(0, 0, 0, 0.7);
    padding: 2px 8px;
    border-radius: 3px;
    position: absolute;
    bottom: 4px;
    right: 4px;
}

.page-card-label {
    text-align: center;
    padding: 8px 4px;
    font-size: 16px;
    font-weight: 600;
    background-color: black;
    color: var(--primary-light-color);
}

/* #endregion */

/* #region Back Button */
.back-btn {
    display: inline-block;
    margin-bottom: 1em;
    padding: 8px 20px;
    background-color: #00B800;
    color: white;
    font-size: 18px;
    border: 3px solid #fff;
    border-radius: 8px;
    cursor: pointer;
    text-decoration: none;
    box-shadow: 0 0 8px rgba(0, 0, 0, 0.4);
    transition: background-color 0.2s ease;
}

.back-btn:hover {
    background-color: #00FF00;
    color: black;
}

.back-btn:active {
    background-color: #666;
}
/* #endregion */

/* #region Responsive */
@media (max-width: 430px) {
    #chapters-container {
        width: 95vw;
    }

    .pages-grid {
        grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
        gap: 8px;
    }

    .chapter-header {
        font-size: 18px;
        padding: 10px 12px;
    }

    #chapters-title {
        font-size: 22px;
    }
}

@media (max-width: 344px) {
    .pages-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}
/* #endregion */