/**
 * Collection Page CSS
 * Styles specific to collection pages (individual and index)
 */

/* ==========================================================================
   Collection Header
   ========================================================================== */

.collection-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 3rem 1rem;
    text-align: center;
}

.collection-title {
    font-size: 2rem;
    font-weight: 700;
    margin: 0 0 0.75rem;
    line-height: 1.2;
}

@media (min-width: 768px) {
    .collection-title {
        font-size: 2.5rem;
    }
}

.collection-description {
    font-size: 1.1rem;
    opacity: 0.9;
    margin: 0 0 1rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.5;
}

.collection-stats {
    font-size: 1rem;
    opacity: 0.8;
}

/* ==========================================================================
   Collection Navigation
   ========================================================================== */

.collection-page .main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

.collection-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 2rem;
}

.collection-page .back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
}

.collection-page .back-link:hover {
    color: var(--color-primary-dark);
}

.sort-dropdown {
    padding: 0.5rem 1rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background: white;
    font-size: 0.9rem;
    cursor: pointer;
}

/* ==========================================================================
   Results Info
   ========================================================================== */

.results-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding: 0.75rem 1rem;
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
}

.results-count {
    font-weight: 600;
    color: var(--color-text);
}

/* ==========================================================================
   Collection Books Grid
   ========================================================================== */

.collection-page .books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 1.5rem;
}

@media (min-width: 640px) {
    .collection-page .books-grid {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    }
}

.collection-page .book-card {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s, box-shadow 0.2s;
}

.collection-page .book-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.collection-page .book-link {
    text-decoration: none;
    color: inherit;
    display: block;
}

.collection-page .book-cover {
    position: relative;
    aspect-ratio: 2/3;
    overflow: hidden;
}

.collection-page .book-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Book Rank Badge */
.collection-page .book-rank {
    position: absolute;
    top: 0.5rem;
    left: 0.5rem;
    background: rgba(0,0,0,0.7) !important;
    color: white !important;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-full);
}

/* Effort Badge Override */
.collection-page .effort-badge {
    position: absolute;
    bottom: 0.5rem;
    right: 0.5rem;
    background: rgba(0,0,0,0.7) !important;
    color: white !important;
    font-size: 0.7rem;
    font-weight: 500;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-full);
    top: auto;
    left: auto;
}

/* ==========================================================================
   Book Info
   ========================================================================== */

.collection-page .book-info {
    padding: 1rem;
}

.collection-page .book-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text);
    margin: 0 0 0.25rem;
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.collection-page .book-author {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin: 0 0 0.5rem;
}

.collection-page .book-rating {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.collection-page .book-rating .star {
    color: #fbbf24;
}

.why-snippet {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-top: 0.5rem;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ==========================================================================
   No Results State
   ========================================================================== */

.collection-page .no-results {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--color-text-muted);
}

.collection-page .no-results h3 {
    font-size: 1.5rem;
    color: var(--color-text);
    margin-bottom: 1rem;
}

/* ==========================================================================
   Other Collections Section
   ========================================================================== */

.other-collections {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border-light);
}

.other-collections h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.collection-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.collection-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--color-bg-secondary);
    border-radius: var(--radius-full);
    text-decoration: none;
    color: var(--color-text);
    font-size: 0.9rem;
    transition: background 0.2s;
}

.collection-chip:hover {
    background: var(--color-primary);
    color: white;
}

.collection-chip.active {
    background: var(--color-primary);
    color: white;
}

/* ==========================================================================
   Collections Index Page
   ========================================================================== */

.collections-header {
    background: linear-gradient(135deg, #1e3a5f 0%, #2d5a7b 50%, #1e3a5f 100%);
    color: white;
    padding: 3rem 1rem;
    text-align: center;
}

.collections-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin: 0 0 0.75rem;
}

@media (min-width: 768px) {
    .collections-title {
        font-size: 3rem;
    }
}

.collections-subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    margin: 0;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.collections-index-page .main-content {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

.collections-index-page .back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
    margin-bottom: 2rem;
}

.collections-index-page .back-link:hover {
    color: var(--color-primary-dark);
}

.collections-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

@media (min-width: 640px) {
    .collections-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.collection-card {
    background: white;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex;
    flex-direction: column;
}

.collection-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.collection-link {
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.collection-covers {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2px;
    background: var(--color-border-light);
    aspect-ratio: 4/1.5;
}

.collection-covers img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.collection-content {
    padding: 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.collection-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
    margin: 0 0 0.5rem;
}

.collection-desc {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    margin: 0 0 1rem;
    line-height: 1.5;
    flex: 1;
}

.collection-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid var(--color-border-light);
}

.collection-count {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    font-weight: 500;
}

.collection-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.9rem;
    color: var(--color-primary);
    font-weight: 600;
}

.section-intro {
    text-align: center;
    margin-bottom: 2rem;
}

.section-intro p {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}