:root {
  --primary-color: #0066cc;
  --secondary-color: #f0f0f0;
  --success-color: #28a745;
  --error-color: #dc3545;
  --border-radius: 8px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
}

body {
  font-family: 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', 'Yu Gothic', sans-serif;
  line-height: 1.6;
  color: #333;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-md);
}

header {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

main {
  display: grid;
  gap: var(--spacing-lg);
}

section {
  padding: var(--spacing-lg);
  border: 1px solid #ddd;
  border-radius: var(--border-radius);
}

#upload-zone {
  border: 2px dashed var(--secondary-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  text-align: center;
  cursor: pointer;
  transition: border-color 0.3s ease;
}

#upload-zone:hover {
  border-color: var(--primary-color);
}

#upload-zone.drag-over {
  border-color: var(--primary-color);
  background-color: rgba(0, 102, 204, 0.1);
}

.btn {
  padding: 12px 24px;
  border: none;
  border-radius: var(--border-radius);
  font-size: 16px;
  cursor: pointer;
  transition: background-color 0.3s ease;
  min-height: 44px;
}

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

.btn-primary:hover {
  background-color: #0052a3;
}

.btn-primary:disabled {
  background-color: #ccc;
  cursor: not-allowed;
}

.results-section {
  margin-top: var(--spacing-lg);
  padding: var(--spacing-md);
  background-color: var(--secondary-color);
  border-radius: var(--border-radius);
}

.stat-item {
  display: flex;
  justify-content: space-between;
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid #ddd;
}

.hidden {
    display: none;
}

.download-buttons {
    display: flex;
    gap: var(--spacing-md);
  }

  .download-buttons .btn {
    flex: 1;
  }

.error-display {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  cursor: pointer;
}

.error-content {
  background-color: white;
  padding: var(--spacing-lg);
  border-radius: var(--border-radius);
  max-width: 500px;
  min-width: 300px;
  text-align: center;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  cursor: default;
}

.error-content p {
  color: var(--error-color);
  font-weight: bold;
  margin-bottom: var(--spacing-md);
  word-wrap: break-word;
}

.error-content button {
  margin-top: var(--spacing-sm);
}

@media (max-width: 768px) {
  .download-buttons {
    flex-direction: column;
  }

  .download-buttons .btn {
    width: 100%;
    margin-bottom: var(--spacing-sm);
  }
}

/* ============================================
   FILTER INFO MODAL STYLES
   Isolated, prefixed styles for modal feature
   Safe to remove without affecting existing UI
   ============================================ */

/* Info icon buttons next to labels */
.filter-info-icon {
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  margin-left: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background-color 0.2s ease;
  vertical-align: middle;
}

.filter-info-icon:hover {
  background-color: var(--md-sys-color-surface-container-highest, rgba(0, 0, 0, 0.08));
}

.filter-info-icon .material-symbols-outlined {
  font-size: 20px;
  color: var(--md-sys-color-primary, #6750A4);
}

/* Modal backdrop */
.filter-info-modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  padding: 16px;
  animation: filter-modal-fade-in 0.2s ease-out;
}

@keyframes filter-modal-fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* Modal content container */
.filter-info-modal-content {
  background-color: var(--md-sys-color-surface, #FFFFFF);
  border-radius: 12px;
  max-width: 700px;
  max-height: 90vh;
  width: 100%;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  display: flex;
  flex-direction: column;
  animation: filter-modal-slide-up 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes filter-modal-slide-up {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Modal header */
.filter-info-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--md-sys-color-outline-variant, #CAC4D0);
}

.filter-info-modal-header h3 {
  margin: 0;
  font-size: 1.375rem;
  font-weight: 500;
  color: var(--md-sys-color-on-surface, #1D1B20);
}

.filter-info-modal-close {
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background-color 0.2s ease;
}

.filter-info-modal-close:hover {
  background-color: var(--md-sys-color-surface-container-highest, rgba(0, 0, 0, 0.08));
}

.filter-info-modal-close .material-symbols-outlined {
  font-size: 24px;
  color: var(--md-sys-color-on-surface-variant, #49454F);
}

/* Modal body (scrollable) */
.filter-info-modal-body {
  padding: 24px;
  overflow-y: auto;
  flex: 1;
  color: var(--md-sys-color-on-surface, #1D1B20);
}

/* Filter explanation content */
.filter-explanation {
  font-size: 0.9375rem;
  line-height: 1.6;
}

.filter-intro {
  margin-bottom: 24px;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--md-sys-color-on-surface-variant, #49454F);
}

.filter-explanation h4 {
  margin: 24px 0 16px 0;
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--md-sys-color-on-surface, #1D1B20);
  border-bottom: 2px solid var(--md-sys-color-primary, #6750A4);
  padding-bottom: 8px;
}

/* Individual filter criterion */
.filter-criterion {
  display: flex;
  gap: 16px;
  margin-bottom: 20px;
  padding: 16px;
  background-color: var(--md-sys-color-surface-container-lowest, #F7F2FA);
  border-radius: 8px;
  border-left: 4px solid var(--md-sys-color-primary, #6750A4);
}

.criterion-number {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--md-sys-color-primary, #6750A4);
  color: var(--md-sys-color-on-primary, #FFFFFF);
  border-radius: 50%;
  font-weight: 600;
  font-size: 0.875rem;
}

.criterion-content {
  flex: 1;
}

.criterion-content h5 {
  margin: 0 0 8px 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--md-sys-color-on-surface, #1D1B20);
}

.criterion-content p {
  margin: 4px 0;
  color: var(--md-sys-color-on-surface-variant, #49454F);
  line-height: 1.6;
}

.criterion-content code {
  background-color: var(--md-sys-color-surface-container-high, #EBE6ED);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
  font-size: 0.875rem;
  color: var(--md-sys-color-primary, #6750A4);
}

.criterion-reason {
  font-weight: 500;
  margin-top: 8px;
  color: var(--md-sys-color-on-surface, #1D1B20);
}

.criterion-detail {
  font-size: 0.875rem;
  font-style: italic;
  color: var(--md-sys-color-on-surface-variant, #49454F);
}

.criterion-list {
  margin: 8px 0;
  padding-left: 20px;
}

.criterion-list li {
  margin: 4px 0;
  color: var(--md-sys-color-on-surface-variant, #49454F);
}

/* Filter note box */
.filter-note {
  background-color: var(--md-sys-color-secondary-container, #E8DEF8);
  padding: 16px;
  border-radius: 8px;
  margin-top: 20px;
}

.filter-note p {
  margin: 0 0 12px 0;
  color: var(--md-sys-color-on-secondary-container, #1D192B);
}

.filter-note ol {
  margin: 8px 0;
  padding-left: 24px;
}

.filter-note ol li {
  margin: 4px 0;
  color: var(--md-sys-color-on-secondary-container, #1D192B);
}

/* Dark mode adjustments */
@media (prefers-color-scheme: dark) {
  .filter-criterion {
    background-color: var(--md-sys-color-surface-container-low, #1D1B20);
    border-left-color: var(--md-sys-color-primary, #D0BCFF);
  }

  .criterion-number {
    background-color: var(--md-sys-color-primary, #D0BCFF);
    color: var(--md-sys-color-on-primary, #381E72);
  }

  .criterion-content code {
    background-color: var(--md-sys-color-surface-container-high, #36343B);
    color: var(--md-sys-color-primary, #D0BCFF);
  }

  .filter-note {
    background-color: var(--md-sys-color-secondary-container, #4A4458);
  }
}

/* Responsive adjustments for modal */
@media (max-width: 640px) {
  .filter-info-modal-content {
    max-height: 95vh;
  }

  .filter-info-modal-header {
    padding: 16px;
  }

  .filter-info-modal-header h3 {
    font-size: 1.125rem;
  }

  .filter-info-modal-body {
    padding: 16px;
  }

  .filter-criterion {
    flex-direction: column;
    gap: 12px;
  }

  .criterion-number {
    align-self: flex-start;
  }
}

.sql-download {
  margin-left: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.sql-download:hover:not(.disabled) {
  transform: scale(1.05);
  opacity: 0.9;
}

.sql-download.disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}