/* ==========================================================================
   MONTHLY RETURNS WEB APPLICATION - LIGHT THEME DESIGN SYSTEM
   Papua New Guinea Department of Education - Provincial Secondary Schools
   ========================================================================== */

:root {
  /* Clean, Premium Light Theme Palette */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-card-hover: #fcfcfd;
  --bg-input: #ffffff;
  --bg-input-focus: #f8fafc;
  
  --border-color: #e2e8f0;
  --border-focus: #2563eb;
  --border-card: #e2e8f0;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-inverse: #ffffff;
  
  --accent-primary: #2563eb;
  --accent-primary-hover: #1d4ed8;
  --accent-primary-glow: rgba(37, 99, 235, 0.12);
  
  --accent-success: #059669;
  --accent-success-glow: rgba(5, 150, 105, 0.12);
  --accent-warning: #d97706;
  --accent-danger: #dc2626;
  --accent-info: #0284c7;
  --accent-purple: #7c3aed;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px -2px rgba(15, 23, 42, 0.06), 0 2px 4px -2px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 12px 28px -4px rgba(15, 23, 42, 0.08), 0 4px 10px -2px rgba(15, 23, 42, 0.04);
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-full: 9999px;
  
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, monospace;
  
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  background-image: 
    radial-gradient(at 0% 0%, rgba(37, 99, 235, 0.04) 0px, transparent 50%),
    radial-gradient(at 100% 100%, rgba(5, 150, 105, 0.04) 0px, transparent 50%);
  background-attachment: fixed;
}

/* App Layout */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Header & Navbar */
.app-header {
  background: #ffffff;
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
  padding: 0.75rem 1.5rem;
}

.header-inner {
  max-width: 1440px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-section {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.brand-logo {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, #2563eb, #059669);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  box-shadow: 0 4px 10px rgba(37, 99, 235, 0.25);
  font-size: 1.25rem;
}

.brand-text h1 {
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.brand-badge {
  font-size: 0.6875rem;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  background: #eff6ff;
  color: var(--accent-primary);
  border: 1px solid #bfdbfe;
  font-weight: 700;
  text-transform: uppercase;
}

.brand-subtitle {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

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

/* Nav Tabs */
.nav-tabs-wrapper {
  background: #ffffff;
  border-bottom: 1px solid var(--border-color);
  padding: 0.25rem 1.5rem 0;
}

.nav-tabs {
  max-width: 1440px;
  margin: 0 auto;
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  scrollbar-width: none;
}
.nav-tabs::-webkit-scrollbar { display: none; }

.tab-btn {
  padding: 0.75rem 1.25rem;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.tab-btn:hover {
  color: var(--text-primary);
  background: #f8fafc;
}

.tab-btn.active {
  color: var(--accent-primary);
  border-bottom-color: var(--accent-primary);
}

.tab-count-badge {
  font-size: 0.75rem;
  background: #f1f5f9;
  color: var(--text-secondary);
  padding: 0.1rem 0.45rem;
  border-radius: var(--radius-full);
  font-weight: 700;
}
.tab-btn.active .tab-count-badge {
  background: #eff6ff;
  color: var(--accent-primary);
}

/* Main Content Area */
.main-content {
  flex: 1;
  max-width: 1440px;
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem;
}

/* Top Stats / KPI Banner */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.kpi-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 1.125rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.kpi-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.kpi-info h4 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
  font-weight: 700;
}

.kpi-value {
  font-size: 1.625rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.kpi-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
  font-weight: 500;
}

.kpi-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}

.kpi-blue .kpi-icon { background: #eff6ff; color: #2563eb; }
.kpi-green .kpi-icon { background: #ecfdf5; color: #059669; }
.kpi-purple .kpi-icon { background: #f5f3ff; color: #7c3aed; }
.kpi-amber .kpi-icon { background: #fffbeb; color: #d97706; }

/* Action Toolbar */
.toolbar {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* Form Cards & Sections */
.form-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.section-title {
  display: flex;
  align-items: center;
  gap: 0.625rem;
}

.section-title h3 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
}

.section-tag {
  font-size: 0.6875rem;
  font-weight: 800;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  background: #eff6ff;
  color: var(--accent-primary);
  border: 1px solid #bfdbfe;
}

.section-description {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

/* Grid Forms */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-group label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.form-control {
  background: #ffffff;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  padding: 0.625rem 0.875rem;
  border-radius: var(--radius-sm);
  outline: none;
  transition: all var(--transition-fast);
  width: 100%;
}

.form-control:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.form-control[readonly], .form-control:disabled {
  background: #f8fafc;
  color: #64748b;
  cursor: not-allowed;
}

/* Data Tables */
.table-responsive {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  margin-top: 0.75rem;
  box-shadow: var(--shadow-sm);
}

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

.data-table th, .data-table td {
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--border-color);
}

.data-table thead th {
  background: #f8fafc;
  color: #334155;
  font-weight: 700;
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  white-space: nowrap;
}

.data-table tbody tr {
  background: #ffffff;
  transition: background var(--transition-fast);
}

.data-table tbody tr:hover {
  background: #f8fafc;
}

.data-table tfoot td {
  background: #f1f5f9;
  font-weight: 700;
  color: var(--text-primary);
}

.table-input {
  background: #ffffff;
  border: 1px solid #cbd5e1;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  padding: 0.35rem 0.5rem;
  border-radius: var(--radius-sm);
  width: 100%;
  text-align: center;
  transition: border-color var(--transition-fast);
}

.table-input:focus {
  border-color: var(--border-focus);
  outline: none;
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.15);
}

.table-input.num-input {
  font-family: var(--font-mono);
  font-weight: 600;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 700;
}
.badge-blue { background: #eff6ff; color: #2563eb; border: 1px solid #bfdbfe; }
.badge-green { background: #ecfdf5; color: #059669; border: 1px solid #a7f3d0; }
.badge-amber { background: #fffbeb; color: #d97706; border: 1px solid #fde68a; }
.badge-purple { background: #f5f3ff; color: #7c3aed; border: 1px solid #ddd6fe; }
.badge-red { background: #fef2f2; color: #dc2626; border: 1px solid #fecaca; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1.125rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent-primary);
  color: white;
  box-shadow: 0 2px 6px rgba(37, 99, 235, 0.25);
}
.btn-primary:hover {
  background: var(--accent-primary-hover);
  transform: translateY(-1px);
}

.btn-success {
  background: var(--accent-success);
  color: white;
  box-shadow: 0 2px 6px rgba(5, 150, 105, 0.25);
}
.btn-success:hover {
  background: #047857;
  transform: translateY(-1px);
}

.btn-secondary {
  background: #f1f5f9;
  color: #334155;
  border-color: #cbd5e1;
}
.btn-secondary:hover {
  background: #e2e8f0;
  color: var(--text-primary);
}

.btn-outline {
  background: #ffffff;
  border-color: #cbd5e1;
  color: #475569;
}
.btn-outline:hover {
  border-color: #94a3b8;
  color: var(--text-primary);
  background: #f8fafc;
}

.btn-danger-outline {
  background: #ffffff;
  border-color: #fecaca;
  color: #dc2626;
}
.btn-danger-outline:hover {
  background: #fef2f2;
  border-color: #dc2626;
}

.btn-sm {
  padding: 0.4rem 0.75rem;
  font-size: 0.8125rem;
}

.btn-icon-only {
  padding: 0.5rem;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
}

/* Category Legend Box */
.category-legend {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.5rem;
  background: #f8fafc;
  padding: 0.85rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  margin-top: 1rem;
}

.category-item {
  font-size: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: #334155;
}
.category-code {
  font-family: var(--font-mono);
  font-weight: 700;
  color: #0369a1;
  background: #e0f2fe;
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  border: 1px solid #bae6fd;
}

/* Report Preview Container */
.report-paper {
  background: #ffffff;
  color: #0f172a;
  border-radius: var(--radius-md);
  padding: 2.5rem 3rem;
  margin: 0 auto;
  max-width: 1050px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  font-family: 'Times New Roman', Times, serif;
}

.report-header-official {
  text-align: center;
  border-bottom: 2px solid #000;
  padding-bottom: 1rem;
  margin-bottom: 1.25rem;
}

.report-header-official h2 {
  font-size: 1.25rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.2rem;
}

.report-header-official h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.2rem;
}

.report-header-official p {
  font-size: 0.9rem;
  font-weight: 600;
}

.report-meta-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  font-family: var(--font-sans);
  font-size: 0.875rem;
}

.report-meta-item {
  border-bottom: 1px dotted #94a3b8;
  padding-bottom: 0.25rem;
}

.report-meta-label {
  font-weight: 700;
  color: #475569;
  font-size: 0.75rem;
  text-transform: uppercase;
}

.report-meta-val {
  font-weight: 700;
  color: #0f172a;
}

.official-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  margin-bottom: 1.25rem;
}

.official-table th, .official-table td {
  border: 1px solid #1e293b;
  padding: 0.45rem 0.5rem;
  text-align: center;
}

.official-table th {
  background: #f1f5f9;
  font-weight: 700;
}

.official-table td.text-left {
  text-align: left;
}

.official-table tr.total-row {
  background: #f8fafc;
  font-weight: 800;
}

.report-signatures {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  margin-top: 2.5rem;
  font-family: var(--font-sans);
}

.sig-block {
  border-top: 1px solid #000;
  padding-top: 0.5rem;
  text-align: center;
}

.sig-title {
  font-weight: 700;
  font-size: 0.875rem;
}

.sig-sub {
  font-size: 0.75rem;
  color: #64748b;
}

/* Modals */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background: #ffffff;
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  max-width: 600px;
  width: 100%;
  padding: 1.75rem;
  box-shadow: var(--shadow-lg);
  transform: scale(0.95);
  transition: transform var(--transition-normal);
}

.modal-overlay.active .modal-card {
  transform: scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.modal-header h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toast {
  background: #ffffff;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.875rem;
  font-weight: 600;
  transform: translateY(20px);
  opacity: 0;
  transition: all var(--transition-fast);
}

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

.toast-success { border-left: 4px solid var(--accent-success); }
.toast-info { border-left: 4px solid var(--accent-primary); }
.toast-error { border-left: 4px solid var(--accent-danger); }

/* Print Media Query */
@media print {
  body {
    background: #fff !important;
    color: #000 !important;
  }
  .app-header, .nav-tabs-wrapper, .toolbar, .kpi-grid, .no-print, .toast-container, .modal-overlay, .tab-actions {
    display: none !important;
  }
  .main-content {
    padding: 0 !important;
    max-width: 100% !important;
  }
  .report-paper {
    box-shadow: none !important;
    padding: 0 !important;
    max-width: 100% !important;
    border: none !important;
  }
  .tab-pane {
    display: none !important;
  }
  .tab-pane.report-active-print {
    display: block !important;
  }
  @page {
    margin: 1.5cm 1cm;
    size: A4 portrait;
  }
}

/* Responsiveness */
@media (max-width: 768px) {
  .header-inner { flex-direction: column; align-items: stretch; }
  .header-actions { justify-content: space-between; }
  .report-paper { padding: 1.25rem; }
  .report-meta-grid { grid-template-columns: 1fr 1fr; }
  .report-signatures { grid-template-columns: 1fr; gap: 1.5rem; }
}