/* ============================================
   VB Daily Sentiment Dashboard V2 - Styles
   Modern Design System
   ============================================ */

/* CSS Variables - Design Tokens */
:root {
  /* Colors - Brand */
  --brand-primary: #667eea;
  --brand-secondary: #764ba2;
  --brand-gradient: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-secondary) 100%);

  /* Colors - Semantic */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  --color-info: #3b82f6;

  /* Colors - Emotions */
  --emotion-wow: #f59e0b;
  --emotion-curious: #3b82f6;
  --emotion-boring: #6b7280;

  /* Backgrounds */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-elevated: #ffffff;

  /* Text */
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-tertiary: #94a3b8;

  /* Borders */
  --border-color: #e2e8f0;
  --border-color-hover: #cbd5e1;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

  /* Spacing (8px base) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Utility: visually hidden but focusable/clickable */
.visually-hidden {
  position: absolute !important;
  left: -9999px !important;
  width: 1px !important;
  height: 1px !important;
  opacity: 0 !important;
  pointer-events: none;
}

/* Navbar */
.navbar {
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.nav-content {
  max-width: 1600px;
  margin: 0 auto;
  padding: var(--space-4) var(--space-6);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-6);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.nav-brand h1 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.version-badge {
  background: var(--brand-gradient);
  color: white;
  font-size: 0.75rem;
  font-weight: 600;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
}

.nav-actions {
  display: flex;
  gap: var(--space-3);
}

.nav-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.nav-btn:hover {
  background: var(--bg-secondary);
  border-color: var(--border-color-hover);
  color: var(--text-primary);
}

.nav-btn.secondary {
  background: transparent;
}

.nav-btn .icon {
  font-size: 1rem;
}

/* Welcome State */
.welcome-state {
  min-height: calc(100vh - 80px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-8);
}

.welcome-content {
  max-width: 600px;
  text-align: center;
}

.welcome-icon {
  font-size: 5rem;
  margin-bottom: var(--space-6);
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.welcome-content h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--space-4);
  color: var(--text-primary);
}

.welcome-content > p {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-8);
  line-height: 1.7;
}

.upload-zone {
  background: var(--bg-elevated);
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-10);
  margin-bottom: var(--space-8);
  transition: all var(--transition-base);
  cursor: pointer;
}

.upload-zone:hover, .upload-zone.drag-over {
  border-color: var(--brand-primary);
  background: #f0f4ff;
}

.upload-icon {
  font-size: 3rem;
  margin-bottom: var(--space-4);
}

.upload-text {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-6);
}

.btn-primary {
  background: var(--brand-gradient);
  color: white;
  padding: var(--space-3) var(--space-8);
  border: none;
  border-radius: var(--radius-lg);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.welcome-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--space-4);
}

.feature {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4);
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.feature-icon {
  font-size: 1.5rem;
}

/* Dashboard */
.dashboard {
  max-width: 1600px;
  margin: 0 auto;
  padding: var(--space-6);
}

/* Smart Insights Banner */
.insights-banner {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.insight-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-4);
  transition: all var(--transition-base);
}

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

.insight-card.highlight {
  background: var(--brand-gradient);
  border: none;
  color: white;
}

.insight-card.highlight .insight-label,
.insight-card.highlight .insight-text {
  color: rgba(255, 255, 255, 0.9);
}

.insight-icon {
  font-size: 2rem;
  flex-shrink: 0;
}

.insight-content {
  flex: 1;
  min-width: 0;
}

.insight-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-tertiary);
  margin-bottom: var(--space-1);
}

.insight-text {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.4;
}

/* Metrics Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.metric-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  transition: all var(--transition-base);
}

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

.metric-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-3);
}

.metric-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.metric-icon {
  font-size: 1.5rem;
}

.metric-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
  line-height: 1;
}

.metric-change {
  font-size: 0.875rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

.metric-change.positive { color: var(--color-success); }
.metric-change.negative { color: var(--color-danger); }
.metric-change.neutral { color: var(--text-tertiary); }

/* Controls Bar */
.controls-bar {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  margin-bottom: var(--space-6);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
  align-items: flex-end;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.control-group label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.segmented-control {
  display: inline-flex;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  padding: var(--space-1);
}

.segmented-control input[type="radio"] {
  display: none;
}

.segmented-control label {
  padding: var(--space-2) var(--space-4);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.segmented-control input[type="radio"]:checked + label {
  background: var(--bg-elevated);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

.select-control {
  padding: var(--space-2) var(--space-4);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.select-control:hover {
  border-color: var(--border-color-hover);
}

/* Charts Grid */
.charts-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-6);
}

.chart-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  grid-column: span 6;
  transition: all var(--transition-base);
}

.chart-card:hover {
  box-shadow: var(--shadow-md);
}

.chart-card.spotlight {
  grid-column: span 4;
}

.chart-card.wide {
  grid-column: span 8;
}

.chart-card.full-width {
  grid-column: span 12;
}

.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-5);
  gap: var(--space-4);
}

.chart-header h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-1);
}

.chart-subtitle {
  font-size: 0.875rem;
  color: var(--text-tertiary);
  font-weight: 400;
}

.chart-toolbar {
  display: flex;
  gap: var(--space-3);
  align-items: center;
}

.toggle-group {
  display: inline-flex;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  padding: var(--space-1);
}

.toggle-btn {
  padding: var(--space-2) var(--space-3);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.toggle-btn:hover {
  color: var(--text-primary);
}

.toggle-btn.active {
  background: var(--bg-elevated);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

.chart-action {
  padding: var(--space-2);
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-tertiary);
  cursor: pointer;
  font-size: 1.25rem;
  line-height: 1;
  transition: all var(--transition-fast);
}

.chart-action:hover {
  border-color: var(--border-color-hover);
  color: var(--text-primary);
}

.chart-body {
  position: relative;
}

canvas {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-lg);
}

/* Emotion Stats */
.emotion-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-5);
}

.emotion-stat {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  background: var(--bg-tertiary);
  border-radius: var(--radius-lg);
}

.emotion-stat .emoji {
  font-size: 2rem;
}

.stat-details {
  display: flex;
  flex-direction: column;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  font-weight: 500;
}

.stat-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

/* List View */
.list-view {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.list-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-3);
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}

.list-item:hover {
  background: var(--bg-secondary);
}

.list-item-label {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-primary);
}

.list-item-value {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-secondary);
}

/* Table View */
.table-view {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

thead {
  background: var(--bg-tertiary);
  position: sticky;
  top: 0;
  z-index: 1;
}

thead th {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  font-weight: 600;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-color);
}

tbody td {
  padding: var(--space-3) var(--space-4);
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
}

tbody tr:last-child td {
  border-bottom: none;
}

tbody tr:hover {
  background: var(--bg-tertiary);
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: var(--space-6);
}

.modal-content {
  background: var(--bg-elevated);
  border-radius: var(--radius-2xl);
  max-width: 600px;
  width: 100%;
  box-shadow: var(--shadow-xl);
  animation: modalSlideUp 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes modalSlideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-6);
  border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.modal-close {
  background: transparent;
  border: none;
  font-size: 2rem;
  color: var(--text-tertiary);
  cursor: pointer;
  line-height: 1;
  transition: color var(--transition-fast);
}

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

.modal-body {
  padding: var(--space-6);
}

.export-options {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

.export-option {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-6);
  background: var(--bg-tertiary);
  border: 2px solid transparent;
  border-radius: var(--radius-xl);
  cursor: pointer;
  transition: all var(--transition-base);
}

.export-option:hover {
  background: var(--bg-elevated);
  border-color: var(--brand-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.export-icon {
  font-size: 2.5rem;
}

.export-label {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  z-index: 2000;
}

.loader {
  width: 48px;
  height: 48px;
  border: 4px solid var(--border-color);
  border-top-color: var(--brand-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

.loading-overlay p {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-secondary);
}

/* Responsive Design */
@media (max-width: 1024px) {
  .chart-card {
    grid-column: span 12 !important;
  }

  .insights-banner {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-content {
    flex-direction: column;
    gap: var(--space-4);
  }

  .nav-actions {
    width: 100%;
    justify-content: space-between;
  }

  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .controls-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .export-options {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .metrics-grid {
    grid-template-columns: 1fr;
  }

  .emotion-stats {
    grid-template-columns: 1fr;
  }
}

/* Print Styles */
@media print {
  .navbar,
  .controls-bar,
  .chart-action,
  .chart-toolbar {
    display: none !important;
  }

  .chart-card {
    break-inside: avoid;
    page-break-inside: avoid;
  }
}