@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap");

/* Modern CSS Reset & Variables */
:root {
  /* Training portal inspired palette */
  --primary-color: #0077c2;
  --primary-hover: #005a93;
  --primary-soft: rgba(0, 119, 194, 0.08);
  --primary-strong-soft: rgba(0, 119, 194, 0.16);
  --secondary-color: #64748b;
  --success-color: #2e7d6d;
  --warning-color: #ff8c00;
  --error-color: #c55b66;
  --background-top: #ffffff;
  --background-bottom: #f8f9fb;
  --background-color: #f6f9fc;
  --surface-color: rgba(255, 255, 255, 0.92);
  --surface-strong: #ffffff;
  --border-color: rgba(100, 116, 139, 0.14);
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --nav-background: rgba(255, 255, 255, 0.86);
  
  /* Shadows */
  --shadow-sm: 0 6px 20px rgb(15 23 42 / 0.06);
  --shadow-md: 0 14px 32px rgb(15 23 42 / 0.1);
  --shadow-lg: 0 24px 48px rgb(15 23 42 / 0.16);
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-xl: 1.25rem;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  
  /* Typography */
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 200ms ease-in-out;
  --transition-slow: 300ms ease-in-out;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Inter", "Helvetica Neue", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(0, 119, 194, 0.08), transparent 28%),
    linear-gradient(180deg, var(--background-top), var(--background-bottom));
  color: var(--text-primary);
  line-height: 1.6;
  letter-spacing: -0.01em;
  overflow-x: hidden;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1,
h2,
h3,
h4 {
  font-family: "SF Pro Display", "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  letter-spacing: -0.02em;
}

button,
input,
select {
  font-family: "SF Pro Text", "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
}

::selection {
  background: var(--primary-color);
  color: #fff;
}

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(14px);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 1;
  transition: opacity var(--transition-slow);
}

.loading-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.loading-spinner {
  width: 48px;
  height: 48px;
  border: 4px solid rgba(100, 116, 139, 0.18);
  border-top: 4px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: var(--space-lg);
}

.loading-text {
  font-size: var(--font-size-lg);
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
}

.loading-progress {
  width: 300px;
  max-width: 90vw;
}

.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: var(--space-sm);
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary-color), #63a9dd);
  border-radius: var(--radius-md);
  transition: width var(--transition-base);
  width: 0%;
}

.progress-text {
  text-align: center;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Error Messages */
.error-container {
  position: fixed;
  top: var(--space-lg);
  right: var(--space-lg);
  z-index: 1000;
  transition: all var(--transition-base);
}

.error-container.hidden {
  opacity: 0;
  transform: translateX(100%);
  pointer-events: none;
}

.error-message {
  background: var(--surface-strong);
  border: 1px solid var(--error-color);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  max-width: 400px;
  animation: slideIn 0.3s ease-out;
}

.error-icon {
  font-size: var(--font-size-lg);
}

.error-close {
  background: none;
  border: none;
  font-size: var(--font-size-xl);
  cursor: pointer;
  color: var(--text-secondary);
  padding: var(--space-xs);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast);
}

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

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Navigation */
.navbar {
  background: var(--nav-background);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: var(--space-md) var(--space-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-brand h1 {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.8);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.brand-mark {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 0.9rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #fff;
  background: linear-gradient(135deg, var(--primary-color), #268fd2);
  box-shadow: 0 10px 24px rgba(0, 119, 194, 0.22);
}

.brand-text {
  display: inline-block;
}

.nav-links {
  display: flex;
  gap: var(--space-xs);
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  padding: var(--space-sm) var(--space-md);
  border-radius: 999px;
  font-weight: 500;
  font-size: var(--font-size-sm);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  transition: all var(--transition-fast);
  border: 1px solid transparent;
  position: relative;
}

.nav-link:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.72);
  border-color: var(--border-color);
}

.nav-link.active {
  color: var(--primary-color);
  background: var(--primary-soft);
  border-color: var(--primary-strong-soft);
  box-shadow: inset 0 0 0 1px rgba(0, 119, 194, 0.04);
}

.nav-icon {
  width: 1.7rem;
  height: 1.7rem;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  line-height: 1;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--primary-color);
  background: rgba(0, 119, 194, 0.09);
  border: 1px solid rgba(0, 119, 194, 0.12);
}

.nav-actions {
  display: flex;
  gap: 0.75rem;
}

/* Buttons */
.btn-primary, .btn-secondary {
  padding: var(--space-sm) var(--space-md);
  border-radius: 999px;
  font-weight: 500;
  font-size: var(--font-size-sm);
  letter-spacing: 0.01em;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  cursor: pointer;
  border: 1px solid;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), #268fd2);
  color: white;
  border-color: transparent;
  box-shadow: 0 10px 24px rgba(0, 119, 194, 0.2);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-hover), var(--primary-color));
  border-color: transparent;
  transform: translateY(-1px);
  box-shadow: 0 14px 28px rgba(0, 90, 147, 0.24);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.76);
  color: var(--text-secondary);
  border-color: var(--border-color);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  color: var(--primary-color);
  border-color: rgba(0, 119, 194, 0.22);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-icon {
  width: 1.55rem;
  height: 1.55rem;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.6rem;
  line-height: 1;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: currentColor;
  background: rgba(255, 255, 255, 0.65);
  border: 1px solid rgba(100, 116, 139, 0.14);
}

/* Main Content */
.main-content {
  padding: 2.25rem var(--space-xl) 3rem;
  max-width: 1400px;
  margin: 0 auto;
}

/* Filters Panel */
.filters-panel {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
  margin-bottom: var(--space-xl);
  display: flex;
  align-items: flex-end;
  gap: var(--space-lg);
  flex-wrap: wrap;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(12px);
  position: relative;
  overflow: hidden;
}

.filters-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(145deg, rgba(0, 119, 194, 0.05), transparent 68%);
  pointer-events: none;
}

.filter-group {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.45rem;
  min-width: 11rem;
}

.filter-group label {
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.date-input,
.select-input {
  padding: var(--space-sm);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.82);
}

.date-input:focus,
.select-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(0, 119, 194, 0.14);
}

/* Pages */
.page {
  display: block;          /* keep layout so canvases have size */
  visibility: hidden;      /* hide content without collapsing */
  height: 0;
  overflow: hidden;
}

.page.active {
  visibility: visible;
  height: auto;
}


.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.75rem;
  padding-bottom: 1.1rem;
  border-bottom: 1px solid var(--border-color);
}

.page-header h2 {
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
  line-height: 1.15;
}

.page-actions {
  display: flex;
  gap: var(--space-sm);
}

.page-content {
  display: grid;
  gap: 1.75rem;
}

.overall-section {
  display: grid;
  gap: var(--space-lg);
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--border-color);
}

.overall-section:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.overall-section-header h3 {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid rgba(100, 116, 139, 0.2);
  line-height: 1.2;
}

/* KPI Cards */
.kpis-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.kpi-card {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(12px);
}

.kpi-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(145deg, rgba(0, 119, 194, 0.045), transparent 70%);
  pointer-events: none;
}

.kpi-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(0, 119, 194, 0.18);
}

.kpi-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  line-height: 1;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  flex-shrink: 0;
}

.kpi-content {
  flex: 1;
}

.kpi-value {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.2;
}

.kpi-label {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-top: var(--space-xs);
  letter-spacing: 0.02em;
}

.kpi-change {
  font-size: var(--font-size-xs);
  margin-top: var(--space-xs);
  font-weight: 500;
}

.kpi-change.positive {
  color: var(--success-color);
}

.kpi-change.negative {
  color: var(--error-color);
}

/* Charts */
.charts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--space-xl);
}

.chart-card {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
  backdrop-filter: blur(12px);
  position: relative;
}

.chart-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(145deg, rgba(0, 119, 194, 0.05), transparent 72%);
  pointer-events: none;
}

.chart-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(0, 119, 194, 0.18);
}

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

.chart-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
  line-height: 1.25;
}

.chart-actions {
  display: flex;
  gap: var(--space-xs);
}

.chart-action {
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--border-color);
  border-radius: 999px;
  padding: var(--space-xs);
  cursor: pointer;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.action-icon {
  font-size: 0.58rem;
  line-height: 1;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.chart-action:hover {
  color: var(--primary-color);
  border-color: rgba(0, 119, 194, 0.22);
  background: rgba(255, 255, 255, 0.96);
}

/* CRITICAL FIX: Chart containers need proper height */
.chart-container {
  padding: var(--space-lg);
  position: relative;
  min-height: 300px;
  width: 100%;
  display: block;
}

.chart-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* Data Tables */
.table-container {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  margin-top: var(--space-xl);
  backdrop-filter: blur(12px);
}

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

.table-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
  line-height: 1.25;
}

.table-wrapper {
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
}

.data-table th,
.data-table td {
  padding: var(--space-md);
  text-align: left;
  border-bottom: 1px solid var(--border-color);
  font-size: var(--font-size-sm);
}

.data-table th {
  background: rgba(0, 119, 194, 0.04);
  font-weight: 600;
  color: var(--text-primary);
  position: sticky;
  top: 0;
}

.data-table tr:hover {
  background: rgba(0, 119, 194, 0.035);
}

/* No Data State */
.no-data-state {
  text-align: center;
  padding: var(--space-2xl);
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(12px);
}

.no-data-icon {
  width: 4.5rem;
  height: 4.5rem;
  margin: 0 auto var(--space-lg);
  border-radius: 1.4rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--primary-color);
  background: rgba(0, 119, 194, 0.08);
  border: 1px solid rgba(0, 119, 194, 0.14);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.55);
  margin-bottom: var(--space-lg);
  opacity: 0.9;
}

.no-data-state h3 {
  font-size: var(--font-size-xl);
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.no-data-state p {
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
}

/* Tooltips */
.tooltip {
  position: relative;
}

.tooltip::before {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(30, 41, 59, 0.96);
  color: white;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  font-size: var(--font-size-xs);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
  z-index: 1000;
  margin-bottom: var(--space-sm);
}

.tooltip:hover::before {
  opacity: 1;
}

.error-icon {
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  line-height: 1;
  font-weight: 700;
  color: var(--error-color);
  background: rgba(197, 91, 102, 0.1);
  border: 1px solid rgba(197, 91, 102, 0.2);
  flex-shrink: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
  .navbar {
    padding: var(--space-md);
    flex-direction: column;
    gap: var(--space-md);
  }
  
  .nav-brand h1 {
    font-size: var(--font-size-xl);
  }
  
  .nav-links {
    width: 100%;
    justify-content: center;
  }
  
  .main-content {
    padding: var(--space-md);
  }
  
  .filters-panel {
    flex-direction: column;
    align-items: stretch;
  }
  
  .filter-group {
    justify-content: space-between;
  }
  
  .page-header {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-md);
  }
  
  .kpis-grid {
    grid-template-columns: 1fr;
  }
  
  .charts-grid {
    grid-template-columns: 1fr;
  }
  
  .chart-container {
    height: 250px;
    min-height: 250px;
  }
}

@media (max-width: 480px) {
  .nav-links {
    flex-direction: column;
    width: 100%;
  }
  
  .nav-link {
    justify-content: center;
    padding: var(--space-md);
  }
  
  .loading-progress {
    width: 280px;
  }
  
  .error-container {
    left: var(--space-md);
    right: var(--space-md);
  }
  
  .error-message {
    max-width: none;
  }
}

/* Utility Classes */
.hidden {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* Fullscreen Chart Styles */
.chart-card.fullscreen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 9999;
  background: rgba(255, 255, 255, 0.96);
  border-radius: 0;
  box-shadow: none;
  display: flex;
  flex-direction: column;
}

.chart-card.fullscreen .chart-container {
  flex: 1;
  padding: var(--space-xl);
  min-height: auto;
  height: auto;
  display: flex;
  align-items: center;
  justify-content: center;
}

.chart-card.fullscreen .chart-canvas {
  max-width: 90vw;
  max-height: 80vh;
  width: auto;
  height: auto;
}

.chart-card.fullscreen .chart-header {
  flex-shrink: 0;
  border-bottom: 2px solid var(--border-color);
  background: rgba(248, 249, 251, 0.94);
}

/* Animation for fullscreen transition */
.chart-card {
  transition: all 0.3s ease-in-out;
}

/* Ensure fullscreen overlay */
.chart-card.fullscreen::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(15, 23, 42, 0.22);
  z-index: -1;
}