/* style.css - Premium Stylesheet for Excel Report Compare Tool */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

:root {
  /* Light Theme Color Tokens */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.7);
  --border-color: #e2e8f0;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  
  --color-primary: #4f46e5;
  --color-primary-hover: #4338ca;
  --color-primary-light: #e0e7ff;
  
  --color-success: #10b981;
  --color-success-bg: #ecfdf5;
  --color-success-border: #a7f3d0;
  
  --color-danger: #ef4444;
  --color-danger-bg: #fef2f2;
  --color-danger-border: #fecaca;
  
  --color-warning: #f59e0b;
  --color-warning-bg: #fffbeb;
  --color-warning-border: #fde68a;
  
  --color-ignored: #6b7280;
  --color-ignored-bg: #f3f4f6;
  --color-ignored-border: #e5e7eb;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --radius: 12px;
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  /* Dark Theme Color Tokens */
  --bg-primary: #0b0f19;
  --bg-secondary: #161e2e;
  --bg-glass: rgba(22, 30, 46, 0.7);
  --border-color: #243048;
  
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --color-primary: #6366f1;
  --color-primary-hover: #4f46e5;
  --color-primary-light: #1e1b4b;
  
  --color-success: #34d399;
  --color-success-bg: #064e3b;
  --color-success-border: #065f46;
  
  --color-danger: #f87171;
  --color-danger-bg: #7f1d1d;
  --color-danger-border: #991b1b;
  
  --color-warning: #fbbf24;
  --color-warning-bg: #78350f;
  --color-warning-border: #92400e;
  
  --color-ignored: #9ca3af;
  --color-ignored-bg: #374151;
  --color-ignored-border: #4b5563;
}

/* Global Reset & Base */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  transition: background-color 0.3s ease, color 0.3s ease;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1, h2, h3, h4 {
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
}

button, input, select {
  font-family: inherit;
  color: inherit;
}

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

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* App Header styling */
header {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 0.85rem 2.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

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

.brand-logo {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  object-fit: contain;
}

.brand h1 {
  font-family: 'Outfit', sans-serif;
  font-weight: 800;
  font-size: 1.4rem;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.theme-toggle-btn {
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

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

.github-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border-radius: 20px;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: var(--transition);
}

.github-link:hover {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  border-color: var(--color-primary);
}

/* App Main Container */
main {
  flex: 1;
  max-width: 1600px;
  width: 96%;
  margin: 0 auto;
  padding: 1.5rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

/* Screen 1: Compare Files & Upload Form */
.compare-container {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

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

@media (max-width: 768px) {
  .upload-grid {
    grid-template-columns: 1fr;
  }
}

.upload-card {
  background: var(--bg-secondary);
  border: 2px dashed var(--border-color);
  border-radius: var(--radius);
  padding: 2.5rem 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
  position: relative;
  min-height: 220px;
}

.upload-card:hover, .upload-card.dragover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
  opacity: 0.95;
}

.upload-card input[type="file"] {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

.upload-icon {
  background-color: var(--bg-primary);
  color: var(--color-primary);
  padding: 1rem;
  border-radius: 50%;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.upload-card:hover .upload-icon {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.upload-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.upload-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.file-info {
  display: none;
  width: 100%;
  padding: 0.75rem;
  background-color: var(--bg-primary);
  border-radius: 8px;
  border: 1px solid var(--border-color);
  font-size: 0.875rem;
  font-weight: 500;
  align-items: center;
  justify-content: space-between;
  margin-top: 1rem;
  z-index: 5;
}

.file-info.active {
  display: flex;
}

.file-info span {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 80%;
  color: var(--text-primary);
}

.file-remove-btn {
  background: none;
  border: none;
  color: var(--color-danger);
  cursor: pointer;
  padding: 0.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
}

.file-remove-btn:hover {
  background-color: var(--color-danger-bg);
}

/* Config Grid */
.config-card {
  background: var(--bg-secondary);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
}

.config-title {
  font-size: 1.1rem;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.config-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

@media (max-width: 768px) {
  .config-grid {
    grid-template-columns: 1fr;
  }
}

.config-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.config-group label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.select-control, .input-control {
  width: 100%;
  padding: 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-size: 0.9rem;
  outline: none;
  transition: var(--transition);
}

.select-control:focus, .input-control:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.ignore-rules-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1rem;
  background-color: var(--bg-primary);
  padding: 1rem;
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  user-select: none;
}

.checkbox-label input[type="checkbox"] {
  width: 16px;
  height: 16px;
  border-radius: 4px;
  border: 1px solid var(--border-color);
  accent-color: var(--color-primary);
  cursor: pointer;
}

/* Action button */
.btn-primary {
  background-color: var(--color-primary);
  color: #ffffff;
  padding: 0.9rem 2rem;
  border-radius: 8px;
  border: none;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  width: 100%;
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Loading overlay & logs */
.loading-container {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.loading-container.active {
  display: flex;
}

.spinner {
  width: 50px;
  height: 50px;
  border: 4px solid var(--border-color);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 1s infinite linear;
  margin-bottom: 1.5rem;
}

.progress-text {
  font-weight: 600;
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.progress-log {
  font-size: 0.85rem;
  color: var(--text-secondary);
  max-width: 400px;
  word-break: break-all;
}

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

/* Screen 2: Dashboard & Results view */
.results-container {
  display: none;
  flex-direction: column;
  gap: 2rem;
}

.results-container.active {
  display: flex;
}

.dashboard-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
}

.summary-card {
  background-color: var(--bg-secondary);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.summary-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
}

.summary-card.primary::before, .summary-card.info::before { background-color: var(--color-primary); }
.summary-card.success::before { background-color: var(--color-success); }
.summary-card.danger::before { background-color: var(--color-danger); }
.summary-card.warning::before { background-color: var(--color-warning); }

.summary-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.summary-card-header svg {
  width: 20px;
  height: 20px;
}

.summary-card.primary svg, .summary-card.info svg { color: var(--color-primary); }
.summary-card.success svg { color: var(--color-success); }
.summary-card.danger svg { color: var(--color-danger); }
.summary-card.warning svg { color: var(--color-warning); }

.summary-card-value {
  font-size: 2rem;
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
  margin-bottom: 0.25rem;
}

.summary-card-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Exports Panel */
.export-panel {
  background: var(--bg-secondary);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  padding: 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.export-title {
  font-size: 1rem;
  font-weight: 600;
}

.export-buttons {
  display: flex;
  gap: 0.75rem;
}

.btn-secondary {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.6rem 1.25rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-secondary:hover {
  background-color: var(--border-color);
  transform: translateY(-1px);
}

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

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

/* Sheet Navigator Layout (Full Width) */
.comparison-layout {
  display: block;
  width: 100%;
}

.details-panel {
  background-color: var(--bg-secondary);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  padding: 1.5rem 1.75rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  width: 100%;
  max-width: 100%;
  min-width: 0;
}

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

.sheet-title-area {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.sheet-select-wrapper {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  padding: 0.5rem 0.9rem;
  border-radius: 8px;
  transition: var(--transition);
}

.sheet-select-wrapper:hover {
  border-color: var(--color-primary);
}

.sheet-select-icon {
  width: 18px;
  height: 18px;
  color: var(--color-primary);
}

.sheet-select-label {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-secondary);
}

.header-sheet-dropdown {
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 700;
  font-family: 'Outfit', sans-serif;
  cursor: pointer;
  outline: none;
  padding-right: 0.5rem;
}

.sheet-title-area h2 {
  font-size: 1.5rem;
}

/* Accordions for Sheet Level Diffs */
.diff-section {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
  background-color: var(--bg-primary);
}

.diff-section-header {
  padding: 1rem 1.25rem;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  user-select: none;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

.diff-section-header:hover {
  background-color: var(--bg-primary);
}

.diff-section-content {
  padding: 1.25rem;
  display: none;
}

.diff-section.open .diff-section-content {
  display: block;
}

.diff-section-header svg {
  transition: transform 0.2s ease;
}

.diff-section.open .diff-section-header svg {
  transform: rotate(180deg);
}

/* Column Differences List */
.column-diff-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.column-diff-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  border: 1px solid transparent;
}

.column-diff-item.added {
  background-color: var(--color-success-bg);
  color: var(--color-success);
  border-color: var(--color-success-border);
}

.column-diff-item.removed {
  background-color: var(--color-danger-bg);
  color: var(--color-danger);
  border-color: var(--color-danger-border);
}

.column-diff-item.warning {
  background-color: var(--color-warning-bg);
  color: var(--color-warning);
  border-color: var(--color-warning-border);
}

/* Cell Differences Table styling */
.cell-diff-table-container {
  overflow-x: auto;
  border: 1px solid var(--border-color);
  border-radius: 6px;
}

.cell-diff-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  text-align: left;
}

.cell-diff-table th {
  background-color: var(--bg-secondary);
  color: var(--text-secondary);
  font-weight: 600;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
}

.cell-diff-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
}

.cell-diff-table tbody tr:hover {
  background-color: var(--bg-secondary);
}

/* Search and filter tools inside Sheet Detail */
.sheet-tools {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.search-box {
  display: flex;
  align-items: center;
  position: relative;
  flex: 1;
  min-width: 200px;
  max-width: 400px;
}

.search-box input {
  width: 100%;
  padding: 0.6rem 0.75rem 0.6rem 2.25rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-size: 0.875rem;
}

.search-box svg {
  position: absolute;
  left: 0.75rem;
  color: var(--text-muted);
  width: 16px;
  height: 16px;
}

.filter-pills {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.25rem;
}

.filter-pill {
  background: none;
  border: 1px solid var(--border-color);
  padding: 0.4rem 1rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--text-secondary);
  transition: var(--transition);
  white-space: nowrap;
}

.filter-pill:hover {
  background-color: var(--border-color);
}

.filter-pill.active {
  background-color: var(--color-primary);
  color: #ffffff;
  border-color: var(--color-primary);
}

/* Comparison Grid View */
.grid-view-wrapper {
  position: relative;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: auto;
  max-height: 650px;
  background-color: var(--bg-secondary);
  width: 100%;
  max-width: 100%;
}

.grid-comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.grid-comparison-table th {
  position: sticky;
  top: 0;
  background-color: var(--bg-primary);
  color: var(--text-secondary);
  font-weight: 600;
  padding: 0.75rem 1rem;
  border-bottom: 2px solid var(--border-color);
  border-right: 1px solid var(--border-color);
  z-index: 10;
  white-space: nowrap;
}

/* Frozen Column 1: Row Mapping (@:@) */
.grid-comparison-table th:nth-child(1),
.grid-comparison-table td:nth-child(1) {
  position: sticky;
  left: 0;
  min-width: 70px;
  width: 70px;
  text-align: center;
  font-family: monospace;
  font-size: 0.8rem;
  background-color: var(--bg-secondary);
  z-index: 15;
  border-right: 1px solid var(--border-color);
}

/* Frozen Column 2: Status Tag (!) */
.grid-comparison-table th:nth-child(2),
.grid-comparison-table td:nth-child(2) {
  position: sticky;
  left: 70px;
  min-width: 55px;
  width: 55px;
  text-align: center;
  font-family: monospace;
  font-weight: 700;
  font-size: 0.85rem;
  background-color: var(--bg-secondary);
  z-index: 15;
  border-right: 2px solid var(--border-color);
  box-shadow: 2px 0 5px rgba(0, 0, 0, 0.04);
}

.grid-comparison-table td {
  padding: 0.6rem 0.85rem;
  border-bottom: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
  white-space: nowrap;
}

.grid-comparison-table tr:hover td:nth-child(1),
.grid-comparison-table tr:hover td:nth-child(2) {
  background-color: var(--bg-primary);
}

/* Row states in unified grid */
.grid-row-missing td {
  background-color: var(--color-danger-bg) !important;
  color: var(--color-danger);
}
.grid-row-added td {
  background-color: var(--color-success-bg) !important;
  color: var(--color-success);
}

/* Diff Status Tags */
.tag-added {
  color: #10b981;
  background: #ecfdf5;
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 700;
}
.tag-deleted {
  color: #ef4444;
  background: #fef2f2;
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 700;
}
.tag-modified {
  color: #4f46e5;
  background: #e0e7ff;
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 700;
}

/* Column Mapping Headers */
.col-added-header {
  background-color: #ecfdf5 !important;
  color: #10b981 !important;
}

[data-theme="dark"] .col-added-header {
  background-color: #064e3b !important;
  color: #34d399 !important;
}

.col-deleted-header {
  background-color: #fef2f2 !important;
  color: #ef4444 !important;
}

[data-theme="dark"] .col-deleted-header {
  background-color: #7f1d1d !important;
  color: #f87171 !important;
}

/* Column Level Tinting */
.grid-col-added {
  background-color: #ecfdf5 !important;
  color: #065f46;
}
[data-theme="dark"] .grid-col-added {
  background-color: #064e3b !important;
  color: #a7f3d0;
}

.grid-col-deleted {
  background-color: #fef2f2 !important;
  color: #991b1b;
}
[data-theme="dark"] .grid-col-deleted {
  background-color: #7f1d1d !important;
  color: #fecaca;
}

/* Cell Diff Highlights (Soft Blue Indigo Theme) */
.grid-cell-diff {
  background-color: #e0e7ff !important;
  border: 1px solid #818cf8 !important;
  font-weight: 500;
  position: relative;
  border-radius: 4px;
}

[data-theme="dark"] .grid-cell-diff {
  background-color: #1e1b4b !important;
  border: 1px solid #6366f1 !important;
}

.cell-diff-val-wrapper {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
}

.cell-diff-old {
  color: #ef4444;
  text-decoration: line-through;
  opacity: 0.85;
}

.cell-diff-arrow {
  color: #4f46e5;
  font-weight: bold;
  font-size: 0.75rem;
}

[data-theme="dark"] .cell-diff-arrow {
  color: #818cf8;
}

.cell-diff-new {
  color: #10b981;
  font-weight: 700;
}

/* Pagination container styling */
.pagination-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.pagination-buttons {
  display: flex;
  gap: 0.5rem;
}

.pagination-btn {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 600;
  transition: var(--transition);
}

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

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

/* Help Panel Styling */
.help-card {
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-primary));
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  padding: 1.5rem;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.help-card svg {
  color: var(--color-primary);
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  margin-top: 0.15rem;
}

.help-content h3 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.help-content ul {
  list-style: none;
}

.help-content li {
  font-size: 0.85rem;
  color: var(--text-secondary);
  position: relative;
  padding-left: 1rem;
  margin-bottom: 0.25rem;
}

.help-content li::before {
  content: '•';
  color: var(--color-primary);
  position: absolute;
  left: 0;
  font-weight: bold;
}

/* Footer style */
footer {
  text-align: center;
  padding: 1.5rem;
  color: var(--text-muted);
  font-size: 0.8rem;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
}

/* Responsive / Mobile styles override */
@media (max-width: 576px) {
  main {
    padding: 1rem;
    gap: 1.25rem;
  }
  
  header {
    padding: 1rem;
  }
  
  header h1 {
    font-size: 1.1rem;
  }
  
  .github-link span {
    display: none;
  }
  
  .summary-card {
    padding: 1rem;
  }
  
  .summary-card-value {
    font-size: 1.75rem;
  }
  
  .export-panel {
    flex-direction: column;
    align-items: stretch;
  }
  
  .export-buttons {
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .sheet-tools {
    flex-direction: column;
    align-items: stretch;
  }
  
  .search-box {
    max-width: 100%;
  }
  
  .details-panel {
    padding: 1rem;
  }
  
  .grid-view-wrapper {
    max-height: 400px;
  }
}

/* ==========================================================================
   VIEW SWITCHER AND EXCEL WORKBOOK VIEW STYLES
   ========================================================================== */

/* View switcher tabs styling */
.view-mode-tabs {
  display: flex;
  gap: 0.75rem;
  background-color: var(--bg-secondary);
  padding: 0.5rem;
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.view-mode-tab {
  background: none;
  border: none;
  padding: 0.6rem 1.25rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition);
}

.view-mode-tab:hover {
  background-color: var(--bg-primary);
  color: var(--text-primary);
}

.view-mode-tab.active {
  background-color: var(--color-primary);
  color: #ffffff;
}

/* Results panel toggle visibility */
.results-view {
  display: none;
}

.results-view.active {
  display: block;
}

/* Excel side-by-side viewer */
.excel-viewer-card {
  background-color: var(--bg-secondary);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  padding: 1.5rem 1.75rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

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

.excel-viewer-title-group h2 {
  font-size: 1.35rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.excel-viewer-title-group p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.excel-viewer-tools {
  display: flex;
  gap: 1.5rem;
}

.excel-split-grids {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  align-items: start;
}

@media (max-width: 992px) {
  .excel-split-grids {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

.excel-grid-pane {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background-color: var(--bg-secondary);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  min-width: 0; /* Ensures the split pane respects 50/50 column constraints */
}

.excel-pane-title {
  padding: 0.75rem 1rem;
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  font-size: 0.875rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-badge {
  font-size: 0.75rem;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-weight: 700;
  text-transform: uppercase;
}

.file-badge.baseline {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

.file-badge.comparison {
  background-color: var(--color-warning-bg);
  color: var(--color-warning);
}

.excel-grid-viewport {
  overflow: auto;
  max-height: 650px;
  width: 100%;
  max-width: 100%;
  position: relative;
  background-color: var(--bg-primary);
}

/* Excel Style Table Headers */
.excel-table {
  border-collapse: collapse;
  font-size: 0.8rem;
  width: max-content;
  min-width: 100%;
  background-color: var(--bg-secondary);
}

.excel-table th.excel-col-letter {
  position: sticky;
  top: 0;
  background-color: var(--bg-primary);
  color: var(--text-secondary);
  font-weight: 500;
  padding: 0.25rem 0.75rem;
  border-bottom: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
  z-index: 10;
  text-align: center;
  font-family: monospace;
}

.excel-table td.excel-row-num {
  position: sticky;
  left: 0;
  background-color: var(--bg-primary);
  color: var(--text-secondary);
  font-weight: 500;
  padding: 0.25rem 0.5rem;
  border-right: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  z-index: 5;
  text-align: center;
  font-family: monospace;
  width: 40px;
}

.excel-table td.excel-cell {
  padding: 0.35rem 0.75rem;
  border-right: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
  color: var(--text-primary);
}

/* Excel Highlights */
.excel-cell-added {
  background-color: #ecfdf5 !important;
  color: #065f46 !important;
  font-weight: 600;
}

[data-theme="dark"] .excel-cell-added {
  background-color: #064e3b !important;
  color: #a7f3d0 !important;
}

.excel-cell-removed {
  background-color: #fef2f2 !important;
  color: #991b1b !important;
  text-decoration: line-through;
}

[data-theme="dark"] .excel-cell-removed {
  background-color: #7f1d1d !important;
  color: #fecaca !important;
}

.excel-cell-modified {
  background-color: #e0e7ff !important;
  color: #3730a3 !important;
  border: 1px solid #818cf8 !important;
  font-weight: 600;
}

[data-theme="dark"] .excel-cell-modified {
  background-color: #1e1b4b !important;
  color: #c7d2fe !important;
  border: 1px solid #6366f1 !important;
}

/* Excel Bottom Tabs */
.excel-bottom-tabs {
  display: flex;
  gap: 2px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.25rem 0.5rem 0 0.5rem;
  overflow-x: auto;
}

.excel-tab {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-bottom: none;
  padding: 0.5rem 1.25rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: 6px 6px 0 0;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
  box-shadow: 0 -1px 2px rgba(0,0,0,0.02);
}

.excel-tab:hover {
  background-color: var(--border-color);
  color: var(--text-primary);
}

.excel-tab.active {
  background-color: var(--bg-secondary);
  color: var(--color-primary);
  border-color: var(--border-color) var(--border-color) transparent var(--border-color);
  font-weight: 700;
  position: relative;
  z-index: 5;
}

.excel-tab.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: var(--color-primary);
}

.excel-tab.match .excel-tab-status { background-color: var(--color-success); }
.excel-tab.diff .excel-tab-status { background-color: var(--color-warning); }
.excel-tab.missing .excel-tab-status { background-color: var(--color-danger); }
.excel-tab.additional .excel-tab-status { background-color: var(--color-primary); }

.excel-tab-status {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
}

/* Strikethrough tab rename styles */
.old-tab-name {
  text-decoration: line-through;
  opacity: 0.6;
  margin-right: 0.25rem;
}
.new-tab-name {
  font-weight: 600;
}
.deleted-tag {
  color: var(--color-danger);
  font-size: 0.75rem;
  font-weight: bold;
  opacity: 0.95;
}
.added-tag {
  color: var(--color-success);
  font-size: 0.75rem;
  font-weight: bold;
  opacity: 0.95;
}

/* Toast Notification System */
.toast-container {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1.25rem;
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.15), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  font-size: 0.9rem;
  font-weight: 600;
  transform: translateY(-20px);
  opacity: 0;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
}

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

.toast svg {
  width: 20px;
  height: 20px;
}

.toast-info svg { color: var(--color-primary); }
.toast-success svg { color: var(--color-success); }
.toast-danger svg { color: var(--color-danger); }