/* Browse Page Specific Styles */

.page-header {
    background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-secondary) 100%);
    padding: var(--space-2xl) 0;
    border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: var(--space-sm);
    color: var(--color-primary);
    text-align: center;
}

.page-header .lead {
    text-align: center;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
}

.search-section {
    max-width: 700px;
    margin: 0 auto var(--space-xl);
}

.controls-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md) 0;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.results-info {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
}

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

.controls-right {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.sort-control {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.sort-control label {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
}

.sort-control select {
    padding: 0.5rem 2rem 0.5rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.9375rem;
    background: white;
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L6 6L11 1' stroke='%234a4a4a' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
}

.view-toggle {
    display: flex;
    gap: 0.25rem;
    background: var(--color-bg-secondary);
    padding: 0.25rem;
    border-radius: var(--radius-sm);
}

.view-btn {
    padding: 0.5rem;
    background: transparent;
    border: none;
    cursor: pointer;
    border-radius: var(--radius-sm);
    color: var(--color-text-tertiary);
    transition: var(--transition);
}

.view-btn:hover {
    color: var(--color-text);
}

.view-btn.active {
    background: white;
    color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

/* Browse Layout */

.browse-section {
    padding: var(--space-xl) 0 var(--space-3xl);
}

.browse-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: var(--space-2xl);
}

/* Filters Sidebar */

.filters-sidebar {
    position: sticky;
    top: 90px;
    height: fit-content;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
    padding-right: var(--space-md);
}

.filters-sidebar::-webkit-scrollbar {
    width: 6px;
}

.filters-sidebar::-webkit-scrollbar-track {
    background: var(--color-bg-secondary);
    border-radius: 3px;
}

.filters-sidebar::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 3px;
}

.filters-sidebar::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-tertiary);
}

.filters-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-lg);
}

.filters-header h3 {
    font-size: 1.25rem;
    color: var(--color-primary);
}

.clear-filters-btn {
    font-size: 0.875rem;
    color: var(--color-accent-dark);
    font-weight: 600;
    cursor: pointer;
    padding: 0.25rem 0.5rem;
    transition: var(--transition);
}

.clear-filters-btn:hover {
    color: var(--color-primary);
}

.filter-group {
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--color-border-light);
}

.filter-group:last-child {
    border-bottom: none;
}

.filter-group h4 {
    font-size: 0.9375rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: var(--color-text);
    font-family: var(--font-sans);
}

.filter-checkbox {
    display: flex;
    align-items: center;
    padding: 0.5rem 0;
    cursor: pointer;
    position: relative;
}

.filter-checkbox input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.checkmark {
    width: 18px;
    height: 18px;
    border: 2px solid var(--color-border);
    border-radius: 3px;
    margin-right: var(--space-sm);
    transition: var(--transition);
    flex-shrink: 0;
    position: relative;
}

.filter-checkbox input:checked ~ .checkmark {
    background: var(--color-primary);
    border-color: var(--color-primary);
}

.filter-checkbox input:checked ~ .checkmark::after {
    content: '';
    position: absolute;
    left: 5px;
    top: 2px;
    width: 4px;
    height: 8px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.label-text {
    flex: 1;
    font-size: 0.9375rem;
    color: var(--color-text);
}

.count {
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
}

/* Year Slider */

.year-slider-container {
    padding: var(--space-sm) 0;
}

.year-values {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--space-sm);
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--color-text);
}

.year-range {
    width: 100%;
    height: 6px;
    background: var(--color-border);
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
    margin: var(--space-sm) 0;
}

.year-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    background: var(--color-primary);
    border-radius: 50%;
    cursor: pointer;
}

.year-range::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: var(--color-primary);
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

/* Papers Grid/List */

.papers-main {
    min-height: 600px;
}

.papers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: var(--space-xl);
}

.papers-grid.list-view {
    grid-template-columns: 1fr;
}

.papers-grid.list-view .paper-card {
    display: grid;
    grid-template-columns: 1fr 200px;
    gap: var(--space-lg);
}

.papers-grid.list-view .paper-actions {
    flex-direction: column;
}

.paper-actions {
    display: flex;
    gap: var(--space-sm);
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border-light);
}

.btn-paper {
    flex: 1;
    padding: 0.625rem 1rem;
    background: var(--color-primary);
    color: white;
    font-weight: 600;
    font-size: 0.875rem;
    border-radius: var(--radius-sm);
    text-align: center;
    transition: var(--transition);
}

.btn-paper:hover {
    background: var(--color-primary-light);
}

.btn-paper-secondary {
    flex: 1;
    padding: 0.625rem 1rem;
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
    font-weight: 600;
    font-size: 0.875rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.btn-paper-secondary:hover {
    background: var(--color-primary);
    color: white;
}

/* Pagination */

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-md);
    margin-top: var(--space-2xl);
    padding-top: var(--space-xl);
    border-top: 1px solid var(--color-border);
}

.pagination-btn {
    padding: 0.75rem 1.25rem;
    background: white;
    border: 1px solid var(--color-border);
    color: var(--color-text);
    font-weight: 600;
    font-size: 0.9375rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
}

.pagination-btn:hover:not(:disabled) {
    background: var(--color-bg-secondary);
    border-color: var(--color-primary);
}

.pagination-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination-numbers {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.page-num {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: white;
    border: 1px solid var(--color-border);
    color: var(--color-text);
    font-weight: 600;
    font-size: 0.9375rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
}

.page-num:hover {
    background: var(--color-bg-secondary);
    border-color: var(--color-primary);
}

.page-num.active {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.page-dots {
    color: var(--color-text-tertiary);
    font-weight: 600;
}

/* No Results */

.no-results {
    text-align: center;
    padding: var(--space-3xl) var(--space-lg);
}

.no-results-icon {
    font-size: 4rem;
    margin-bottom: var(--space-lg);
}

.no-results h3 {
    font-size: 1.75rem;
    margin-bottom: var(--space-sm);
    color: var(--color-primary);
}

.no-results p {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
}

.no-results-actions {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* Responsive */

@media (max-width: 1024px) {
    .browse-layout {
        grid-template-columns: 240px 1fr;
        gap: var(--space-lg);
    }
}

@media (max-width: 768px) {
    .browse-layout {
        grid-template-columns: 1fr;
    }
    
    .filters-sidebar {
        position: relative;
        top: 0;
        max-height: none;
        padding-right: 0;
        margin-bottom: var(--space-xl);
    }
    
    .controls-bar {
        flex-direction: column;
        align-items: stretch;
    }
    
    .controls-right {
        flex-direction: column;
        gap: var(--space-md);
    }
    
    .sort-control {
        width: 100%;
    }
    
    .sort-control select {
        flex: 1;
    }
    
    .papers-grid {
        grid-template-columns: 1fr;
    }
    
    .papers-grid.list-view .paper-card {
        grid-template-columns: 1fr;
    }
    
    .pagination-numbers {
        flex-wrap: wrap;
    }
}