/* CCAS Research Portal - Styles */

/* CSS Variables for theming */
:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-secondary: #64748b;
  --color-success: #22c55e;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-text: #1e293b;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --color-focus: #3b82f6;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: ui-monospace, 'SF Mono', Monaco, 'Courier New', monospace;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0f172a;
    --color-surface: #1e293b;
    --color-text: #f1f5f9;
    --color-text-muted: #94a3b8;
    --color-border: #334155;
  }
}

/* Reset */
*, *::before, *::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100vh;
}

/* Accessibility */
.skip-link {
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  padding: 0.5rem 1rem;
  background: var(--color-primary);
  color: white;
  text-decoration: none;
  border-radius: var(--radius-md);
  z-index: 1000;
}

.skip-link:focus {
  top: 1rem;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Focus styles */
:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* Header */
header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 1rem 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

header h1 {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
}

.stats {
  display: flex;
  gap: 1.5rem;
}

.stat-item {
  text-align: center;
}

.stat-value {
  display: block;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
}

.stat-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Main content */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

/* Search section */
.search-section {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-md);
  margin-bottom: 2rem;
}

.search-input-wrapper {
  display: flex;
  gap: 0.5rem;
}

#search-input {
  flex: 1;
  padding: 0.875rem 1rem;
  font-size: 1rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color 0.2s, box-shadow 0.2s;
}

#search-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
  outline: none;
}

#search-input::placeholder {
  color: var(--color-text-muted);
}

#search-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  color: white;
  background: var(--color-primary);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color 0.2s;
}

#search-btn:hover {
  background: var(--color-primary-dark);
}

#search-btn:active {
  transform: translateY(1px);
}

.search-help {
  margin: 0.5rem 0 0;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* Filters */
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.filter-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.filter-item label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
}

.filter-item input[type="range"] {
  width: 120px;
  accent-color: var(--color-primary);
}

.filter-item select {
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-text);
}

.filter-item button {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  color: var(--color-primary);
  background: transparent;
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color 0.2s, color 0.2s;
}

.filter-item button:hover {
  background: var(--color-primary);
  color: white;
}

/* Saved searches panel */
.saved-searches-panel {
  margin-top: 1rem;
  padding: 1rem;
  background: var(--color-bg);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.saved-searches-panel h3 {
  margin: 0 0 0.75rem;
  font-size: 0.875rem;
  font-weight: 600;
}

.saved-searches-panel ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.saved-searches-panel li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--color-border);
}

.saved-searches-panel li:last-child {
  border-bottom: none;
}

.saved-search-query {
  cursor: pointer;
  color: var(--color-primary);
}

.saved-search-query:hover {
  text-decoration: underline;
}

.saved-search-delete {
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
  color: var(--color-danger);
  background: transparent;
  border: 1px solid var(--color-danger);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

#save-current-btn {
  margin-top: 0.75rem;
  width: 100%;
  padding: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-primary);
  background: transparent;
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

#save-current-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Results section */
.results-section {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-md);
}

.results-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
}

.results-header h2 {
  margin: 0;
  font-size: 1.25rem;
}

#results-count {
  font-weight: 400;
  color: var(--color-text-muted);
}

.results-actions {
  display: flex;
  gap: 0.5rem;
}

.results-actions button {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  color: var(--color-secondary);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}

.results-actions button:hover:not(:disabled) {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.results-actions button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Results container */
.results-container {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.empty-state {
  text-align: center;
  padding: 3rem;
  color: var(--color-text-muted);
}

/* Paper card */
.paper-card {
  display: flex;
  gap: 1rem;
  padding: 1.25rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.paper-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.paper-card.selected {
  border-color: var(--color-primary);
  background: rgba(37, 99, 235, 0.05);
}

.paper-checkbox {
  flex-shrink: 0;
  padding-top: 0.25rem;
}

.paper-checkbox input {
  width: 18px;
  height: 18px;
  accent-color: var(--color-primary);
  cursor: pointer;
}

.paper-content {
  flex: 1;
  min-width: 0;
}

.paper-title {
  margin: 0 0 0.75rem;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-text);
}

.paper-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
  font-size: 0.8125rem;
}

.score-badge,
.relevance-badge,
.domain-badge,
.pmid-badge,
.doi-badge {
  padding: 0.25rem 0.5rem;
  background: var(--color-surface);
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
}

.score-badge {
  background: rgba(34, 197, 94, 0.1);
  color: #16a34a;
}

.score-value {
  font-weight: 600;
}

.relevance-badge {
  background: rgba(245, 158, 11, 0.1);
  color: #d97706;
}

.relevance-badge.relevance-high {
  background: rgba(34, 197, 94, 0.15);
  color: #16a34a;
}

.relevance-badge.relevance-medium {
  background: rgba(245, 158, 11, 0.15);
  color: #d97706;
}

.relevance-badge.relevance-low {
  background: rgba(148, 163, 184, 0.15);
  color: #64748b;
}

.relevance-value {
  font-weight: 600;
}

/* High relevance paper highlight */
.paper-card.high-relevance {
  border-left: 4px solid var(--color-success);
}

.paper-card.high-relevance .paper-title {
  color: var(--color-success);
}

/* Domain badge colors */
.domain-badge {
  background: rgba(99, 102, 241, 0.1);
  color: #6366f1;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.domain-badge.domain-pfac_psychiatric {
  background: rgba(239, 68, 68, 0.1);
  color: #dc2626;
}

.domain-badge.domain-vermis_affect {
  background: rgba(168, 85, 247, 0.1);
  color: #9333ea;
}

.domain-badge.domain-ccas_core {
  background: rgba(14, 165, 233, 0.1);
  color: #0284c7;
}

.domain-badge.domain-case_report {
  background: rgba(34, 197, 94, 0.1);
  color: #16a34a;
}

.domain-badge.domain-neuroimaging {
  background: rgba(236, 72, 153, 0.1);
  color: #db2777;
}

.domain-badge.domain-surgical_outcomes {
  background: rgba(249, 115, 22, 0.1);
  color: #ea580c;
}

.domain-value {
  font-weight: 600;
}

.pmid-link,
.doi-link {
  color: var(--color-primary);
  text-decoration: none;
}

.pmid-link:hover,
.doi-link:hover {
  text-decoration: underline;
}

.paper-actions {
  margin-bottom: 0.75rem;
}

.abstract-toggle {
  padding: 0.375rem 0.75rem;
  font-size: 0.8125rem;
  color: var(--color-primary);
  background: transparent;
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color 0.2s, color 0.2s;
}

.abstract-toggle:hover {
  background: var(--color-primary);
  color: white;
}

.abstract-toggle[aria-expanded="true"] {
  background: var(--color-primary);
  color: white;
}

.paper-abstract {
  margin-top: 0.75rem;
  padding: 1rem;
  background: var(--color-surface);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--color-primary);
}

.abstract-text {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--color-text);
}

.abstract-loading {
  margin: 0;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  font-style: italic;
}

/* Loading state */
.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem;
  color: var(--color-text-muted);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-bottom: 1rem;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Footer */
footer {
  text-align: center;
  padding: 2rem;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

footer a {
  color: var(--color-primary);
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

/* Responsive */
@media (max-width: 768px) {
  main {
    padding: 1rem;
  }

  .search-section,
  .results-section {
    padding: 1.25rem;
  }

  .search-input-wrapper {
    flex-direction: column;
  }

  #search-btn {
    width: 100%;
    justify-content: center;
  }

  .filters {
    flex-direction: column;
    gap: 1rem;
  }

  .results-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .results-actions {
    width: 100%;
    flex-wrap: wrap;
  }

  .results-actions button {
    flex: 1;
    min-width: 120px;
  }

  .paper-meta {
    flex-direction: column;
    gap: 0.5rem;
  }
}

/* Print styles */
@media print {
  header, footer, .filters, .results-actions, .paper-checkbox, .paper-actions {
    display: none;
  }

  .paper-card {
    break-inside: avoid;
    border: 1px solid #ccc;
    margin-bottom: 1rem;
  }

  .paper-abstract {
    display: block !important;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --color-border: currentColor;
  }

  .paper-card {
    border-width: 2px;
  }

  #search-input {
    border-width: 2px;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .spinner {
    animation: none;
  }

  * {
    transition: none !important;
  }
}

/* Toast Notifications */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  max-width: 400px;
  padding: 1rem 1.25rem;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  border-left: 4px solid var(--color-primary);
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  z-index: 1000;
  opacity: 0;
  transform: translateY(1rem);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.toast-visible {
  opacity: 1;
  transform: translateY(0);
}

.toast-success {
  border-left-color: var(--color-success);
}

.toast-warning {
  border-left-color: var(--color-warning);
}

.toast-error {
  border-left-color: var(--color-danger);
}

.toast-info {
  border-left-color: var(--color-primary);
}

.toast-message {
  flex: 1;
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--color-text);
  white-space: pre-line;
}

.toast-close {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  padding: 0;
  background: transparent;
  border: none;
  cursor: pointer;
  font-size: 1.25rem;
  color: var(--color-text-muted);
  line-height: 1;
  transition: color 0.2s;
}

.toast-close:hover {
  color: var(--color-text);
}

/* Mobile toast */
@media (max-width: 768px) {
  .toast {
    left: 1rem;
    right: 1rem;
    bottom: 1rem;
    max-width: none;
  }
}

/* Keyboard shortcut hint styling */
.shortcut-hint {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--color-bg);
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

/* ==================== Stats Dashboard ==================== */

.stats-dashboard {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 2rem 0;
}

.stats-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
}

.stat-card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  text-align: center;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.stat-card-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
}

.stat-card-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ==================== Search Suggestions ==================== */

.search-input-wrapper {
  position: relative;
  display: flex;
  gap: 0.5rem;
}

.suggestions-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  right: 60px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  max-height: 300px;
  overflow-y: auto;
  z-index: 50;
  margin-top: 4px;
}

.suggestion-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  cursor: pointer;
  transition: background-color 0.15s;
}

.suggestion-item:hover,
.suggestion-item.active {
  background: var(--color-bg);
}

.suggestion-icon {
  flex-shrink: 0;
  font-size: 1rem;
}

.suggestion-text {
  flex: 1;
  font-size: 0.9rem;
}

.suggestion-text mark {
  background: rgba(37, 99, 235, 0.2);
  color: var(--color-primary);
  padding: 0 2px;
  border-radius: 2px;
}

.suggestion-type {
  font-size: 0.7rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  padding: 0.125rem 0.375rem;
  background: var(--color-bg);
  border-radius: var(--radius-sm);
}

.suggestion-empty {
  padding: 1rem;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.keyboard-hint {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  background: var(--color-surface);
  padding: 0.125rem 0.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  margin-left: 0.5rem;
}

/* ==================== Data Lake Panel ==================== */

.data-lake-panel {
  margin-top: 1rem;
  padding: 1rem;
  background: var(--color-bg);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.data-lake-panel h3 {
  margin: 0 0 0.75rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

.data-files-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.data-file-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 0.75rem;
  background: var(--color-surface);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color 0.15s, transform 0.15s;
}

.data-file-item:hover {
  background: var(--color-primary);
  color: white;
  transform: translateX(4px);
}

.data-file-icon {
  font-size: 1.25rem;
}

.data-file-name {
  flex: 1;
  font-size: 0.875rem;
  font-family: var(--font-mono);
}

.data-file-size {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.data-file-item:hover .data-file-size {
  color: rgba(255, 255, 255, 0.8);
}

/* ==================== Comparison Panel ==================== */

.comparison-panel {
  max-width: 1200px;
  margin: 1rem auto;
  padding: 1.5rem;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 2px solid var(--color-primary);
}

.comparison-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

.comparison-header h3 {
  margin: 0;
  font-size: 1rem;
  color: var(--color-primary);
}

.comparison-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.comparison-paper {
  padding: 1rem;
  background: var(--color-bg);
  border-radius: var(--radius-md);
}

.comparison-paper h4 {
  margin: 0 0 0.75rem;
  font-size: 0.9rem;
  line-height: 1.4;
}

.comparison-meta {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.comparison-meta div {
  margin-bottom: 0.25rem;
}

.paper-card.comparing {
  border-color: var(--color-warning);
  box-shadow: 0 0 0 2px rgba(245, 158, 11, 0.2);
}

/* ==================== Modal ==================== */

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 2rem;
}

.modal-content {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 600px;
  max-height: 80vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.modal-header h3 {
  margin: 0;
  font-size: 1.125rem;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-text-muted);
  padding: 0;
  line-height: 1;
}

.modal-close:hover {
  color: var(--color-text);
}

.modal-subtitle {
  margin: 0;
  padding: 0.75rem 1.5rem;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  background: var(--color-bg);
}

.modal-body {
  flex: 1;
  overflow-y: auto;
  padding: 1rem 1.5rem;
}

.modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: flex-end;
}

/* ==================== Related Papers ==================== */

.related-paper-item {
  padding: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

.related-paper-item:last-child {
  border-bottom: none;
}

.related-paper-title {
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.related-paper-meta {
  display: flex;
  gap: 0.75rem;
  font-size: 0.8rem;
}

/* ==================== Paper Action Buttons ==================== */

.related-btn,
.compare-btn {
  padding: 0.375rem 0.75rem;
  font-size: 0.8125rem;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s;
  margin-left: 0.5rem;
}

.related-btn:hover {
  border-color: var(--color-success);
  color: var(--color-success);
}

.compare-btn:hover {
  border-color: var(--color-warning);
  color: var(--color-warning);
}

.btn-secondary {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.btn-secondary:hover {
  background: var(--color-border);
}

.btn-close {
  background: none;
  border: none;
  font-size: 1.25rem;
  cursor: pointer;
  color: var(--color-text-muted);
  padding: 0.25rem;
}

.btn-close:hover {
  color: var(--color-danger);
}

/* ==================== Footer Shortcuts ==================== */

/* ==================== Quick Filters ==================== */

.quick-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
}

.quick-filter-btn {
  padding: 0.375rem 0.75rem;
  font-size: 0.8rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  cursor: pointer;
  transition: all 0.2s;
  color: var(--color-text-muted);
}

.quick-filter-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(37, 99, 235, 0.05);
}

.quick-filter-btn.active {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.quick-filter-btn.filter-high-relevance {
  border-color: var(--color-success);
  color: var(--color-success);
}

.quick-filter-btn.filter-high-relevance:hover,
.quick-filter-btn.filter-high-relevance.active {
  background: var(--color-success);
  color: white;
}

.clear-filters-btn {
  padding: 0.375rem 0.75rem;
  font-size: 0.8rem;
  background: transparent;
  border: 1px dashed var(--color-border);
  border-radius: 20px;
  cursor: pointer;
  color: var(--color-text-muted);
  transition: all 0.2s;
}

.clear-filters-btn:hover {
  border-color: var(--color-danger);
  color: var(--color-danger);
  border-style: solid;
}

/* ==================== API Version ==================== */

.api-version {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  background: var(--color-surface);
  padding: 0.125rem 0.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
}

.footer-shortcuts {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 0.5rem;
}

.footer-shortcuts kbd {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  background: var(--color-surface);
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  box-shadow: 0 1px 0 var(--color-border);
}

/* ==================== Compact View ==================== */

.compact-view .paper-card {
  padding: 0.75rem;
}

.compact-view .paper-title {
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.compact-view .paper-meta {
  font-size: 0.75rem;
}

/* ==================== Mobile Responsive ==================== */

@media (max-width: 768px) {
  .stats-cards {
    grid-template-columns: repeat(2, 1fr);
  }

  .comparison-grid {
    grid-template-columns: 1fr;
  }

  .suggestions-dropdown {
    right: 0;
  }

  .modal-content {
    margin: 1rem;
    max-height: 90vh;
  }

  .paper-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  .related-btn,
  .compare-btn {
    margin-left: 0;
  }
}

/* ==================== Insights Panel ==================== */

.insights-panel {
  max-width: 1200px;
  margin: 1rem auto;
  padding: 1.25rem;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.insights-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.insights-header h3 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
}

.insights-close {
  background: none;
  border: none;
  font-size: 1.25rem;
  cursor: pointer;
  color: var(--color-text-muted);
  padding: 0.25rem;
}

.insights-close:hover {
  color: var(--color-danger);
}

.insights-content {
  display: grid;
  gap: 1.25rem;
}

.insights-summary {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.insight-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0.75rem 1.25rem;
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

.insight-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
}

.insight-label {
  font-size: 0.7rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.insights-themes h4,
.insights-charts h4,
.query-expansion-info h4 {
  margin: 0 0 0.5rem 0;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

.theme-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.theme-tag {
  padding: 0.375rem 0.75rem;
  background: var(--color-primary);
  color: white;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  cursor: pointer;
  transition: background-color 0.2s, transform 0.1s;
}

.theme-tag:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
}

.bar-chart {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.bar-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.bar-label {
  width: 80px;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  flex-shrink: 0;
}

.bar-track {
  flex: 1;
  height: 20px;
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.bar-fill {
  height: 100%;
  border-radius: var(--radius-sm);
  transition: width 0.5s ease;
}

.bar-fill.high {
  background: var(--color-success);
}

.bar-fill.medium {
  background: var(--color-warning);
}

.bar-fill.low {
  background: var(--color-text-muted);
}

.bar-count {
  width: 30px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text);
  text-align: right;
}

.query-expansion-info {
  padding: 0.75rem;
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--color-primary);
}

.expanded-query {
  margin: 0;
  font-size: 0.8rem;
  color: var(--color-text);
  font-family: var(--font-mono);
}

/* ==================== Word Cloud ==================== */

.word-cloud-container {
  max-width: 1200px;
  margin: 0 auto 1rem;
  padding: 1rem 1.25rem;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.word-cloud-header {
  margin-bottom: 0.75rem;
}

.word-cloud-header h4 {
  margin: 0;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

.word-cloud-terms {
  line-height: 2;
  text-align: center;
}

.cloud-term {
  display: inline-block;
  padding: 0.125rem 0.5rem;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background-color 0.2s;
}

.cloud-term:hover {
  background: var(--color-bg);
}

/* ==================== Collections Panel ==================== */

.collections-panel {
  max-width: 1200px;
  margin: 0.75rem auto 0;
  padding: 1rem;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.collections-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.collections-header h3 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
}

.btn-new-collection {
  padding: 0.375rem 0.75rem;
  font-size: 0.8rem;
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.btn-new-collection:hover {
  background: var(--color-primary-dark);
}

.collections-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.collection-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem;
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

.collection-info {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
}

.collection-name {
  font-weight: 500;
  color: var(--color-text);
}

.collection-count {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.collection-actions {
  display: flex;
  gap: 0.375rem;
}

.collection-actions button {
  padding: 0.25rem 0.5rem;
  font-size: 0.7rem;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--color-text-muted);
}

.collection-actions button:hover {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

/* Collection Menu */

.collection-menu {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  min-width: 180px;
  max-width: 250px;
  overflow: hidden;
}

.collection-menu-header {
  padding: 0.5rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.collection-menu-empty {
  padding: 0.75rem;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  text-align: center;
}

.collection-menu-item {
  display: block;
  width: 100%;
  padding: 0.625rem 0.75rem;
  font-size: 0.8rem;
  text-align: left;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text);
}

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

.collection-menu-divider {
  height: 1px;
  background: var(--color-border);
  margin: 0.25rem 0;
}

.collection-menu-new {
  font-weight: 500;
  color: var(--color-primary);
}

/* Collection Button in Paper Card */

.collect-btn {
  margin-left: 0.5rem;
  padding: 0.375rem 0.625rem;
  font-size: 0.75rem;
  background: transparent;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
}

.collect-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* Collection Modal */

.collection-modal {
  max-width: 600px;
}

.collection-meta {
  margin: 0 0 1rem 0;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.collection-papers {
  list-style: none;
  padding: 0;
  margin: 0;
  max-height: 400px;
  overflow-y: auto;
}

.collection-paper-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

.collection-paper-item:last-child {
  border-bottom: none;
}

.collection-paper-item .paper-title {
  flex: 1;
  font-size: 0.875rem;
  color: var(--color-text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.collection-paper-item button {
  padding: 0.25rem 0.5rem;
  font-size: 0.7rem;
  background: transparent;
  border: 1px solid var(--color-danger);
  color: var(--color-danger);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.collection-paper-item button:hover {
  background: var(--color-danger);
  color: white;
}

/* ==================== Mobile Responsive (Phase 2) ==================== */

@media (max-width: 768px) {
  .insights-summary {
    flex-direction: row;
    justify-content: center;
  }

  .insight-stat {
    flex: 1;
    min-width: 80px;
    padding: 0.5rem;
  }

  .insight-value {
    font-size: 1rem;
  }

  .bar-label {
    width: 60px;
    font-size: 0.7rem;
  }

  .theme-tag {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
  }

  .collection-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .collection-actions {
    width: 100%;
    justify-content: flex-end;
  }
}