/* Hybrid Source-Level Access Indicators */
.source-access-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 1rem;
}

/* Primary PDF Action - Prominent Download Button */
.primary-pdf-action {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-pdf-download {
    background: var(--accent-color);
    color: var(--bg-color);
    padding: 0.75rem 1.5rem;
    min-height: 44px;
    border-radius: 0;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 900;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: var(--shadow);
    border: 3px solid var(--bg-color);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.btn-pdf-download:hover {
    background: var(--accent-hover);
    transform: translate(2px, 2px);
    box-shadow: var(--shadow);
}

.btn-pdf-download .pdf-icon {
    font-size: 1rem;
}

/* Progressive Disclosure - Alternate PDFs Dropdown */
.alternate-pdfs-dropdown {
    display: inline-block;
    position: relative;
}

.alternate-pdfs-dropdown summary {
    cursor: pointer;
    color: var(--accent-color);
    font-size: 0.875rem;
    list-style: none;
    user-select: none;
    padding: 0.375rem 0.625rem;
    border-radius: 3px;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
}

.alternate-pdfs-dropdown summary::-webkit-details-marker {
    display: none;
}

.alternate-pdfs-dropdown summary:hover {
    background-color: rgba(166, 124, 82, 0.15);
    border-color: var(--accent-color);
}

.alternate-pdfs-dropdown .alternate-pdf-list {
    list-style: none;
    padding: 0.5rem;
    margin: 0.25rem 0;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    position: absolute;
    z-index: 10;
    min-width: 180px;
    box-shadow: var(--shadow);
    top: 100%;
    left: 0;
}

.alternate-pdfs-dropdown .alternate-pdf-list li {
    padding: 0.25rem 0;
}

.alternate-pdfs-dropdown .alternate-pdf-list a {
    color: var(--accent-color);
    text-decoration: none;
    font-size: 0.875rem;
    display: block;
    padding: 0.375rem 0.5rem;
    border-radius: 3px;
}

.alternate-pdfs-dropdown .alternate-pdf-list a:hover {
    background-color: rgba(166, 124, 82, 0.15);
    text-decoration: underline;
}

/* All Sources - Chip Display */
.all-sources-chips {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
}

.sources-label {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 500;
}

.source-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.4rem 0.8rem;
    min-height: 36px;
    border-radius: 0;
    font-size: 0.75rem;
    text-decoration: none;
    transition: none;
    border: 2px solid;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Brutalist styling for all source chips */
.source-chip-pdf,
.source-chip-page,
.source-chip-doi {
    background-color: var(--card-bg);
    border-color: var(--border-color);
    color: var(--text-secondary);
}

.source-chip-pdf:hover,
.source-chip-page:hover,
.source-chip-doi:hover {
    background-color: var(--surface-color);
    border-color: var(--accent-color);
    color: var(--accent-color);
}

/* Citation styling - moved below */
/* Citation Count Tiers - Size-based scaling (research shows size/weight > color for metrics) */
.source-citations {
    font-style: normal;
    transition: all 0.15s ease;
}

/* Minimal impact (1-9 citations) - barely visible */
.citation-tier-minimal {
    color: var(--text-tertiary);
    font-size: 0.7rem;
    font-weight: 400;
    opacity: 0.6;
}

/* Low impact (10-49 citations) - subtle */
.citation-tier-low {
    color: var(--text-tertiary);
    font-size: 0.75rem;
    font-weight: 500;
    opacity: 0.7;
}

/* Medium impact (50-99 citations) - noticeable */
.citation-tier-medium {
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 600;
    opacity: 0.8;
}

/* High impact (100+ citations) - prominent */
.citation-tier-high {
    color: var(--accent-color);
    font-size: 0.85rem;
    font-weight: 700;
    opacity: 1.0;
}

/* Mobile Responsive - Vertical Stacking */
@media (max-width: 768px) {
    .source-access-container {
        gap: 1rem;
    }

    .primary-pdf-action {
        flex-direction: column;
        align-items: stretch;
    }

    .btn-pdf-download {
        width: 100%;
        justify-content: center;
        padding: 0.875rem 1.5rem;
    }

    .alternate-pdfs-dropdown {
        width: 100%;
    }

    .alternate-pdfs-dropdown summary {
        width: 100%;
        text-align: center;
    }

    .all-sources-chips {
        flex-direction: column;
        align-items: stretch;
    }

    .source-chip {
        width: 100%;
        justify-content: space-between;
        min-height: 44px; /* WCAG touch target minimum for mobile */
        padding: 0.75rem 1rem;
    }
}

/* Streaming specific styles - Simplified */
.results-summary-complete {
    border-left-color: var(--success-color);
}

.loading-message {
    text-align: center;
    color: var(--text-secondary);
    padding: 2rem;
    font-size: 1.1rem;
    font-style: italic;
}

.paper-card-streaming {
    animation: slideInFade 0.3s ease-out;
}

/* Smooth slide and fade animation for new cards */
@keyframes slideInFade {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.4s ease-out;
}

/* ============================================================================
   READING STATUS DROPDOWN
   ============================================================================ */

/* Reading status wrapper - container for button and dropdown */
.reading-status-wrapper {
    position: relative;
    display: inline-block;
}

/* Reading status button - specific styles (base styles are in shared section below) */

.reading-status-btn .status-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    font-size: 1.125rem;
    line-height: 1;
    opacity: 0.9;
    flex-shrink: 0;
}

.reading-status-btn .status-label {
    font-size: 0.8125rem;
    font-weight: 500;
}

.reading-status-btn .status-dropdown-arrow {
    font-size: 0.625rem;
    margin-left: 0.125rem;
    opacity: 0.7;
}

/* Collection button - specific styles matching status button */

.collection-add-dropdown-btn .collection-icon {
    font-size: 1.125rem;
    line-height: 1;
    opacity: 0.9;
}

.collection-add-dropdown-btn .collection-label {
    font-size: 0.8125rem;
    font-weight: 500;
}

.collection-add-dropdown-btn .collection-dropdown-arrow {
    font-size: 0.625rem;
    margin-left: 0.125rem;
    opacity: 0.7;
}

/* Reading status dropdown menu - 2025 minimalistic */
.reading-status-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    margin-top: 0.25rem;
    min-width: 180px;
    width: max-content;
    background: #2d2420;
    border: 1px solid var(--border-color);
    border-radius: 0;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
    z-index: 9999;
    transform: translate3d(0, 0, 0);
    backface-visibility: hidden;
}

/* Status option buttons in dropdown - 2025 minimalistic */
.status-option {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    width: 100%;
    padding: 0.875rem 1rem;
    min-height: 48px; /* Mobile touch target */
    background: #2d2420;
    border: none;
    border-bottom: 1px solid rgba(192, 163, 146, 0.1);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    text-align: left;
    cursor: pointer;
    transition: all 200ms cubic-bezier(0.4, 0, 0.2, 1);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

.status-option:last-child {
    border-bottom: none;
}

.status-option:hover {
    background: rgba(192, 163, 146, 0.15);
    color: var(--accent-color);
    transform: translateX(2px);
}

.status-option .status-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    font-size: 1.125rem;
    line-height: 1;
    flex-shrink: 0;
}

/* Star icon visual weight compensation */
.status-option[data-status="important"] .status-icon {
    font-size: 0.95rem;
}

/* Mobile responsive styles */
@media (max-width: 768px) {
    .reading-status-wrapper {
        width: 100%;
    }

    .reading-status-btn {
        width: 100%;
        justify-content: space-between;
        padding: 0.875rem 1rem;
    }

    .reading-status-dropdown {
        width: 100%;
        left: 0;
        right: 0;
    }

    .status-option {
        padding: 1rem 1.25rem;
        min-height: 52px; /* Slightly larger on mobile */
    }
}

/* Desktop enhancements for dropdown options */
@media (min-width: 769px) {
    .status-option {
        min-height: 44px;
        padding: 0.75rem 1rem;
    }
}

/* ============================================================================
   PAPER ACTIONS CONTAINER
   ============================================================================ */

/* Unified container for status and collection action buttons */
.paper-actions {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
    flex-wrap: wrap;
    align-items: center;
}

/* Mobile responsive - stack vertically */
@media (max-width: 768px) {
    .paper-actions {
        flex-direction: column;
        gap: 0.5rem;
    }
}

/* ============================================================================
   SHARED PAPER ACTION BUTTON STYLES
   ============================================================================ */

/* Shared base styles for both status and collection action buttons - 2025 minimalistic */
.reading-status-btn,
.collection-add-dropdown-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.5rem 0.875rem;
    min-height: 40px;
    min-width: 40px;
    background: rgba(192, 163, 146, 0.03);
    border: 1px solid var(--border-color);
    border-radius: 0;
    color: var(--text-secondary);
    font-size: 0.8125rem;
    font-weight: 500;
    line-height: 1.2;
    letter-spacing: -0.01em;
    cursor: pointer;
    transition: all 200ms cubic-bezier(0.4, 0, 0.2, 1);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    box-sizing: border-box;
    vertical-align: middle;
}

.reading-status-btn:hover,
.collection-add-dropdown-btn:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
    background: rgba(192, 163, 146, 0.08);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
    transform: translateY(-1px);
}

.reading-status-btn:active,
.collection-add-dropdown-btn:active {
    transform: translateY(0);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

/* Desktop - smaller touch targets */
@media (min-width: 769px) {
    .reading-status-btn,
    .collection-add-dropdown-btn {
        min-height: 36px;
        padding: 0.375rem 0.75rem;
    }
}

/* ============================================================================