/* ==========================================================================
   Tax PDF Generator - Stylesheet
   Modern, Accessible, High-Contrast Design System
   ========================================================================== */

:root {
  /* Color Palette - HSL Tailored */
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-elevated: #ffffff;
  --color-border: #e2e8f0;
  --color-border-subtle: #f1f5f9;
  --color-border-focus: #3b82f6;

  /* Text & Contrast */
  --color-text-main: #0f172a;
  --color-text-muted: #475569;
  --color-text-light: #64748b;
  --color-text-inverse: #ffffff;

  /* Primary Brand (Deep Slate & Vibrant Blue) */
  --color-primary: #1e40af;
  --color-primary-hover: #1d4ed8;
  --color-primary-subtle: #eff6ff;

  /* Accent & Semantic Statuses */
  --color-success: #059669;
  --color-success-bg: #ecfdf5;
  --color-success-border: #a7f3d0;

  --color-warning: #d97706;
  --color-warning-bg: #fffbeb;
  --color-warning-border: #fde68a;

  --color-danger: #dc2626;
  --color-danger-bg: #fef2f2;
  --color-danger-border: #fecaca;

  --color-info: #0284c7;
  --color-info-bg: #f0f9ff;
  --color-info-border: #bae6fd;

  /* Layout & Spacing */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.07);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.08);

  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

/* Base Reset & Box Sizing */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Accessibility: Focus Rings */
:focus-visible {
  outline: 3px solid var(--color-border-focus);
  outline-offset: 2px;
}

/* Skip link for screen-reader & keyboard navigation */
.skip-link {
  position: absolute;
  top: -40px;
  left: 10px;
  background: var(--color-primary);
  color: #fff;
  padding: 8px 16px;
  z-index: 1000;
  text-decoration: none;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 10px;
}

/* Container */
.container {
  width: 100%;
  max-width: 1280px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* ==========================================================================
   Header & App Bar
   ========================================================================== */
.app-header {
  background: #0f172a;
  color: #ffffff;
  padding: 16px 0;
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 50;
}

.app-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.brand-section {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 700;
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.4);
}

.brand-title h1 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: #ffffff;
  margin: 0;
}

.brand-title p {
  font-size: 0.8rem;
  color: #94a3b8;
  margin: 0;
}

.header-status-group {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

/* Badges */
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  letter-spacing: 0.02em;
}

.status-pill.disconnected {
  background-color: #334155;
  color: #cbd5e1;
}

.status-pill.connected {
  background-color: #064e3b;
  color: #6ee7b7;
  border: 1px solid #059669;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: currentColor;
}

.sync-status {
  font-size: 0.8rem;
  color: #94a3b8;
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  line-height: 1.25;
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
}

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

.btn-primary:hover:not(:disabled) {
  background-color: var(--color-primary-hover);
  box-shadow: 0 2px 4px rgba(30, 64, 175, 0.25);
}

.btn-secondary {
  background-color: var(--color-surface);
  color: var(--color-text-main);
  border-color: var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-border-subtle);
  border-color: #cbd5e1;
}

.btn-secondary-dark {
  background-color: #1e293b;
  color: #f1f5f9;
  border-color: #334155;
}

.btn-secondary-dark:hover:not(:disabled) {
  background-color: #334155;
  border-color: #475569;
}

.btn-danger-outline {
  background-color: transparent;
  color: #f87171;
  border-color: #7f1d1d;
}

.btn-danger-outline:hover:not(:disabled) {
  background-color: #7f1d1d;
  color: #ffffff;
}

.btn-success {
  background-color: var(--color-success);
  color: #ffffff;
}

.btn-success:hover:not(:disabled) {
  background-color: #047857;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.8125rem;
}

/* ==========================================================================
   Main Content Layout
   ========================================================================== */
.main-content {
  flex: 1;
  padding: 24px 0 48px;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 1024px) {
  .dashboard-grid {
    grid-template-columns: 340px 1fr;
  }
}

/* Card Container */
.card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.card-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--color-border);
  background-color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.card-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-subtitle {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-top: 2px;
}

.card-body {
  padding: 20px;
  flex: 1;
}

.card-footer {
  padding: 14px 20px;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
}

/* ==========================================================================
   Spreadsheet Settings Form
   ========================================================================== */
.form-group {
  margin-bottom: 16px;
}

.form-group:last-child {
  margin-bottom: 0;
}

.form-label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-main);
  margin-bottom: 6px;
}

.form-input {
  width: 100%;
  font-family: inherit;
  font-size: 0.875rem;
  padding: 9px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background-color: #ffffff;
  color: var(--color-text-main);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus {
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.form-hint {
  font-size: 0.75rem;
  color: var(--color-text-light);
  margin-top: 4px;
}

/* ==========================================================================
   Security & Notice Banner
   ========================================================================== */
.notice-box {
  display: flex;
  gap: 12px;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  line-height: 1.45;
  margin-bottom: 20px;
}

.notice-info {
  background-color: var(--color-info-bg);
  border: 1px solid var(--color-info-border);
  color: #0c4a6e;
}

.notice-warning {
  background-color: var(--color-warning-bg);
  border: 1px solid var(--color-warning-border);
  color: #78350f;
}

.notice-icon {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  margin-top: 2px;
}

/* ==========================================================================
   Client Table & Actions
   ========================================================================== */
.table-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: 16px 20px;
  background-color: #ffffff;
  border-bottom: 1px solid var(--color-border);
}

.bulk-actions-container {
  display: flex;
  align-items: center;
  gap: 12px;
}

.bulk-count-badge {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-primary);
  background-color: var(--color-primary-subtle);
  padding: 4px 10px;
  border-radius: var(--radius-full);
  border: 1px solid #bfdbfe;
}


.search-box {
  position: relative;
  flex: 1;
  min-width: 240px;
  max-width: 400px;
}

.search-input {
  width: 100%;
  padding: 8px 12px 8px 36px;
  font-size: 0.875rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: inherit;
}

.search-icon {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  color: var(--color-text-light);
  pointer-events: none;
}

.table-stats {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* Table Responsive wrapper */
.table-container {
  width: 100%;
  overflow-x: auto;
  min-height: 220px;
}

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

.client-table th {
  background-color: #f8fafc;
  color: var(--color-text-muted);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

.client-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--color-border-subtle);
  color: var(--color-text-main);
  vertical-align: middle;
}

.client-table tbody tr {
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.client-table tbody tr:hover {
  background-color: #f1f5f9;
}

.client-table tbody tr.selected {
  background-color: #eff6ff;
  border-left: 4px solid var(--color-primary);
}

.client-table .col-select {
  width: 44px;
  text-align: center;
}

.client-table .masked-pan {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  background-color: #f1f5f9;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  color: #334155;
  letter-spacing: 0.05em;
}

.regime-badge {
  display: inline-block;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
}

.regime-new {
  background-color: #e0f2fe;
  color: #0369a1;
}

.regime-old {
  background-color: #fef3c7;
  color: #92400e;
}

/* Empty & Loading states */
.state-container {
  padding: 48px 20px;
  text-align: center;
  color: var(--color-text-muted);
}

.state-container svg {
  width: 48px;
  height: 48px;
  margin-bottom: 12px;
  color: #94a3b8;
}

.state-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-main);
  margin-bottom: 4px;
}

/* ==========================================================================
   Selected Row / PDF Generation Action Panel
   ========================================================================== */
.preview-panel {
  margin-top: 24px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin: 16px 0;
  padding: 16px;
  background-color: #f8fafc;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-subtle);
}

.preview-field-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--color-text-light);
  font-weight: 600;
}

.preview-field-val {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text-main);
  margin-top: 2px;
}

.action-buttons {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.app-footer {
  background-color: #ffffff;
  border-top: 1px solid var(--color-border);
  padding: 20px 0;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

/* Spinner */
.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: currentColor;
  animation: spin 0.8s linear infinite;
}

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

/* Screen reader only utility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Polling Pulse Indicator */
.polling-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.75rem;
  color: #94a3b8;
}

.polling-pulse {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: #3b82f6;
  box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.7);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% {
    transform: scale(0.95);
    box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.7);
  }
  70% {
    transform: scale(1);
    box-shadow: 0 0 0 6px rgba(59, 130, 246, 0);
  }
  100% {
    transform: scale(0.95);
    box-shadow: 0 0 0 0 rgba(59, 130, 246, 0);
  }
}

/* ==========================================================================
   PDF Preview Modal
   ========================================================================== */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 100;
  transition: opacity var(--transition-fast);
}

.modal-container {
  background-color: #ffffff;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 900px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.modal-header {
  padding: 16px 20px;
  background-color: #f8fafc;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.modal-close-btn {
  background: transparent;
  border: none;
  font-size: 1.5rem;
  color: var(--color-text-light);
  cursor: pointer;
  padding: 4px;
  line-height: 1;
  border-radius: var(--radius-sm);
}

.modal-close-btn:hover {
  color: var(--color-text-main);
  background-color: var(--color-border);
}

.modal-body {
  flex: 1;
  min-height: 540px;
  padding: 0;
  background-color: #334155;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-body iframe {
  width: 100%;
  height: 560px;
  border: none;
}

.modal-footer {
  padding: 14px 20px;
  background-color: #ffffff;
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}