frontend/css/style.css

/**
 * VidyaBot Frontend Styles
 * Color Palette: Saffron (#FF9933) + Deep Blue (#003F87) + White
 * Mobile-first, responsive, dark mode aware
 */

:root {
  --color-primary: #FF9933;
  --color-dark: #003F87;
  --color-white: #FFFFFF;
  --color-light-gray: #F5F5F5;
  --color-medium-gray: #E0E0E0;
  --color-dark-gray: #666666;
  --color-error: #D32F2F;
  --color-success: #388E3C;
  --color-info: #1976D2;
  
  --font-family-sans: 'Noto Sans', 'Baloo 2', system-ui, sans-serif;
  --font-family-display: 'Baloo 2', 'Noto Sans', system-ui, sans-serif;
  
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-xxl: 3rem;
  
  --border-radius: 8px;
  --transition: all 200ms ease;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-white: #1A1A1A;
    --color-light-gray: #2D2D2D;
    --color-medium-gray: #404040;
    --color-dark-gray: #B0B0B0;
  }
}

/* Global Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  width: 100%;
  height: 100%;
  font-family: var(--font-family-sans);
  background-color: var(--color-white);
  color: #333;
}

@media (prefers-color-scheme: dark) {
  html, body {
    background-color: var(--color-white);
    color: var(--color-dark-gray);
  }
}

/* Accessibility */
body {
  font-size: 16px;
  line-height: 1.6;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: 16px;
}

/* Offline Banner */
.offline-banner {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: var(--color-error);
  color: var(--color-white);
  padding: var(--spacing-md);
  text-align: center;
  font-weight: 600;
  z-index: 1000;
  animation: slideDown 300ms ease;
}

.offline-banner.hidden {
  display: none;
}

@keyframes slideDown {
  from {
    transform: translateY(-100%);
  }
  to {
    transform: translateY(0);
  }
}

/* App Container */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding-top: 0;
}

/* Header */
.header {
  background: linear-gradient(135deg, var(--color-dark) 0%, #002851 100%);
  color: var(--color-white);
  padding: var(--spacing-lg);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.header-content {
  max-width: 900px;
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.logo-icon {
  font-size: 2rem;
}

.logo h1 {
  font-family: var(--font-family-display);
  font-size: 1.8rem;
  font-weight: 700;
}

/* Navigation Tabs */
.nav-tabs {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.nav-tab {
  background: rgba(255, 255, 255, 0.15);
  color: var(--color-white);
  border: none;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--border-radius);
  cursor: pointer;
  font-weight: 500;
  transition: var(--transition);
  font-size: 0.95rem;
}

.nav-tab:hover {
  background: rgba(255, 255, 255, 0.25);
}

.nav-tab.active {
  background: var(--color-primary);
  color: var(--color-dark);
  font-weight: 600;
}

/* Main Content */
.main-content {
  flex: 1;
  max-width: 900px;
  width: 100%;
  margin: 0 auto;
  padding: var(--spacing-lg);
}

.screen {
  display: none;
}

.screen.active {
  display: block;
  animation: fadeIn 300ms ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.screen-content {
  background: var(--color-white);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
}

.screen-content h2 {
  font-family: var(--font-family-display);
  font-size: 1.6rem;
  color: var(--color-dark);
  margin-bottom: var(--spacing-lg);
}

/* Form Elements */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-dark);
  font-size: 0.95rem;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-md);
  border: 2px solid var(--color-medium-gray);
  border-radius: var(--border-radius);
  background: var(--color-white);
  color: #333;
  transition: var(--transition);
  font-size: 1rem;
  line-height: 1.5;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(255, 153, 51, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
  font-family: inherit;
}

.char-count {
  font-size: 0.85rem;
  color: var(--color-dark-gray);
  margin-top: var(--spacing-sm);
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
}

/* Buttons */
.btn {
  padding: var(--spacing-md) var(--spacing-lg);
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  transition: var(--transition);
  font-size: 0.95rem;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-dark);
  font-weight: 700;
}

.btn-primary:hover {
  background: #FF7B00;
}

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

.btn-secondary:hover {
  background: #001F4D;
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover {
  background: rgba(255, 153, 51, 0.1);
}

.btn-large {
  width: 100%;
  padding: var(--spacing-lg);
  font-size: 1.1rem;
}

.btn-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-dark-gray);
}

.btn-spinner.hidden {
  display: none;
}

/* Loading Spinner */
.loading {
  text-align: center;
  padding: var(--spacing-xxl);
}

.loading.hidden {
  display: none;
}

.spinner {
  border: 4px solid var(--color-light-gray);
  border-top: 4px solid var(--color-primary);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
  margin: 0 auto var(--spacing-md);
}

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

/* Answer Container */
.answer-container {
  margin-top: var(--spacing-xl);
}

.answer-container.hidden {
  display: none;
}

.answer-card {
  background: linear-gradient(135deg, rgba(0, 63, 135, 0.05) 0%, rgba(255, 153, 51, 0.05) 100%);
  border: 2px solid var(--color-medium-gray);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  animation: slideUp 300ms ease;
}

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

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(255, 153, 51, 0.4);
  }
  50% {
    box-shadow: 0 0 0 10px rgba(255, 153, 51, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(255, 153, 51, 0);
  }
}

.answer-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  border-bottom: 2px solid var(--color-medium-gray);
  padding-bottom: var(--spacing-md);
}

.answer-header h3 {
  font-family: var(--font-family-display);
  font-size: 1.3rem;
  color: var(--color-dark);
}

.answer-text {
  font-size: 1rem;
  line-height: 1.8;
  color: #333;
  margin: var(--spacing-lg) 0;
  white-space: pre-wrap;
  word-wrap: break-word;
}

@media (prefers-color-scheme: dark) {
  .answer-text {
    color: var(--color-dark-gray);
  }
}

.source-info {
  font-size: 0.9rem;
  color: var(--color-dark-gray);
  margin: var(--spacing-md) 0;
  padding: var(--spacing-md);
  background: rgba(0, 63, 135, 0.05);
  border-left: 3px solid var(--color-primary);
  border-radius: 4px;
}

.cost-badge {
  background: linear-gradient(135deg, var(--color-primary), #FFB84D);
  color: var(--color-dark);
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  text-align: center;
  font-weight: 700;
  margin: var(--spacing-md) 0;
}

.answer-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

@media (max-width: 600px) {
  .answer-actions {
    grid-template-columns: 1fr;
  }
}

/* Upload Zone */
.upload-zone {
  border: 3px dashed var(--color-primary);
  border-radius: var(--border-radius);
  padding: var(--spacing-xxl);
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  background: rgba(255, 153, 51, 0.05);
}

.upload-zone:hover {
  background: rgba(255, 153, 51, 0.1);
  border-color: #FF7B00;
}

.upload-zone.dragover {
  background: rgba(255, 153, 51, 0.2);
  border-color: #FF7B00;
}

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

.upload-zone h3 {
  font-family: var(--font-family-display);
  color: var(--color-dark);
  margin-bottom: var(--spacing-sm);
}

/* Progress Bar */
.progress-bar {
  height: 8px;
  background: var(--color-medium-gray);
  border-radius: 4px;
  overflow: hidden;
  margin: var(--spacing-md) 0;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), #FF7B00);
  width: 0%;
  transition: width 300ms ease;
}

.upload-progress {
  margin: var(--spacing-xl) 0;
}

.upload-progress.hidden {
  display: none;
}

/* Messages */
.error-message,
.success-message {
  padding: var(--spacing-lg);
  border-radius: var(--border-radius);
  margin: var(--spacing-lg) 0;
}

.error-message {
  background: rgba(211, 47, 47, 0.1);
  color: var(--color-error);
  border: 2px solid var(--color-error);
}

.error-message.hidden {
  display: none;
}

.success-card {
  background: rgba(56, 142, 60, 0.1);
  border: 2px solid var(--color-success);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius);
  text-align: center;
}

.success-card h3 {
  color: var(--color-success);
  margin-bottom: var(--spacing-md);
}

.success-message {
  display: none;
}

.success-message:not(.hidden) {
  display: block;
}

/* Dashboard Styles */
.savings-banner {
  background: linear-gradient(135deg, var(--color-primary), #FFB84D);
  color: var(--color-dark);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius);
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.savings-banner h3 {
  font-family: var(--font-family-display);
  font-size: 1.8rem;
  margin-bottom: var(--spacing-sm);
}

.savings-banner p {
  margin: 0;
  opacity: 0.9;
}

/* LIVE SAVINGS METER - Judge Impact Feature */
.savings-meter {
  background: linear-gradient(135deg, rgba(0, 63, 135, 0.05), rgba(255, 153, 51, 0.05));
  border: 2px solid var(--color-primary);
  border-radius: var(--border-radius);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

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

.meter-header h3 {
  font-family: var(--font-family-display);
  font-size: 1.6rem;
  color: var(--color-dark);
  margin-bottom: var(--spacing-sm);
}

.meter-subtitle {
  color: var(--color-dark-gray);
  font-size: 0.9rem;
  margin: 0;
}

.meter-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.meter-section {
  background: var(--color-white);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  border-left: 4px solid var(--color-primary);
}

.meter-label {
  font-family: var(--font-family-display);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-dark);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-md);
}

.progress-bar-large {
  background: var(--color-light-gray);
  border-radius: 4px;
  height: 40px;
  overflow: hidden;
  margin-bottom: var(--spacing-lg);
  display: flex;
  align-items: center;
}

.progress-fill {
  background: linear-gradient(90deg, var(--color-primary), #FFB84D);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: var(--spacing-md);
  color: var(--color-dark);
  font-weight: 700;
  font-size: 0.9rem;
  transition: width 0.5s ease;
}

.progress-text {
  color: var(--color-dark);
  font-weight: 700;
}

.meter-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--spacing-md);
}

.meter-stats.two-column {
  grid-template-columns: 1fr 1fr;
}

.meter-stats > div {
  text-align: center;
}

.meter-value {
  font-family: var(--font-family-display);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-primary);
}

.meter-unit {
  font-size: 0.8rem;
  color: var(--color-dark-gray);
  margin-top: var(--spacing-sm);
}

.meter-section.extrapolation {
  background: linear-gradient(135deg, rgba(255, 153, 51, 0.1), rgba(0, 63, 135, 0.05));
  border-left-color: var(--color-success);
}

.scale-breakdown {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.breakdown-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md);
  background: var(--color-light-gray);
  border-radius: 4px;
  flex-wrap: wrap;
}

.breakdown-item.highlight {
  background: linear-gradient(135deg, rgba(56, 142, 60, 0.1), rgba(255, 153, 51, 0.1));
  border-left: 4px solid var(--color-success);
  font-weight: 700;
}

.item-label {
  font-size: 0.9rem;
  color: var(--color-dark);
  flex: 1;
}

.item-value {
  font-family: var(--font-family-display);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-primary);
  margin: 0 var(--spacing-md);
}

.item-calc {
  font-size: 0.75rem;
  color: var(--color-dark-gray);
  width: 100%;
  text-align: right;
  margin-top: var(--spacing-xs);
}

.meter-section.impact-narrative {
  border-left-color: var(--color-info);
  text-align: center;
  background: linear-gradient(135deg, rgba(25, 118, 210, 0.05), rgba(255, 153, 51, 0.05));
}

.narrative-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
  display: block;
}

.narrative-text {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-dark);
}

.narrative-text strong {
  color: var(--color-primary);
  font-weight: 700;
}

@media (max-width: 600px) {
  .savings-meter {
    padding: var(--spacing-lg);
  }

  .breakdown-item {
    flex-direction: column;
    align-items: flex-start;
  }

  .item-value {
    margin: var(--spacing-md) 0;
  }

  .item-calc {
    width: 100%;
    margin-top: var(--spacing-xs);
  }
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.stat-card {
  background: var(--color-light-gray);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  text-align: center;
  border-left: 4px solid var(--color-primary);
}

.stat-icon {
  font-size: 2rem;
  margin-bottom: var(--spacing-md);
}

.stat-value {
  font-family: var(--font-family-display);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: var(--spacing-sm);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--color-dark-gray);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Chart */
.chart-section {
  background: var(--color-light-gray);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius);
  margin:var(--spacing-xl) 0;
}

.chart-section h3 {
  margin-bottom: var(--spacing-lg);
}

.chart-bars {
  display: flex;
  gap: var(--spacing-lg);
  align-items: flex-end;
  justify-content: center;
  height: 200px;
  margin-bottom: var(--spacing-lg);
}

.chart-bar-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex: 1;
  max-width: 100px;
}

.chart-bar {
  width: 60px;
  background: linear-gradient(180deg, var(--color-primary), #FFB84D);
  border-radius: 8px 8px 0 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--spacing-md);
  color: var(--color-dark);
  font-weight: 700;
  font-size: 0.8rem;
  text-align: center;
}

.chart-bar.baseline {
  background: linear-gradient(180deg, var(--color-dark), #001F4D);
  color: var(--color-white);
}

.bar-label {
  display: block;
  font-size: 0.7rem;
  font-weight: 500;
  margin-bottom: var(--spacing-xs);
}

.bar-value {
  display: block;
  font-size: 1rem;
  font-weight: 700;
}

.chart-note {
  font-size: 0.9rem;
  color: var(--color-dark-gray);
  line-height: 1.6;
}

/* Table */
.table-section {
  margin-top: var(--spacing-xl);
}

.table-section h3 {
  margin-bottom: var(--spacing-lg);
}

.recent-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-white);
  border-radius: var(--border-radius);
  overflow: hidden;
}

.recent-table thead {
  background: var(--color-dark);
  color: var(--color-white);
}

.recent-table th {
  padding: var(--spacing-md);
  text-align: left;
  font-weight: 600;
  font-size: 0.9rem;
}

.recent-table td {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--color-medium-gray);
  font-size: 0.9rem;
}

.recent-table tbody tr:hover {
  background: var(--color-light-gray);
}

.empty-state {
  text-align: center;
  color: var(--color-dark-gray);
  font-style: italic;
}

/* Footer */
.footer {
  background: var(--color-dark);
  color: var(--color-white);
  text-align: center;
  padding: var(--spacing-lg);
  margin-top: auto;
  font-size: 0.9rem;
}

.footer-note {
  margin-top: var(--spacing-sm);
  opacity: 0.8;
}

/* Responsive */
@media (max-width: 768px) {
  .header {
    padding: var(--spacing-md);
  }

  .logo h1 {
    font-size: 1.4rem;
  }

  .nav-tabs {
    gap: var(--spacing-sm);
  }

  .nav-tab {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.85rem;
  }

  .main-content {
    padding: var(--spacing-md);
  }

  .screen-content {
    padding: var(--spacing-md);
  }

  .screen-content h2 {
    font-size: 1.3rem;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 480px) {
  :root {
    --spacing-lg: 1rem;
    --spacing-xl: 1.5rem;
  }

  .header {
    padding: var(--spacing-md) var(--spacing-sm);
  }

  .logo {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
  }

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

  .logo h1 {
    font-size: 1.2rem;
  }

  .nav-tabs {
    gap: var(--spacing-xs);
  }

  .nav-tab {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.75rem;
    flex: 1;
    text-align: center;
  }

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

  .answer-actions {
    grid-template-columns: 1fr;
  }

  .recent-table th,
  .recent-table td {
    padding: var(--spacing-sm);
    font-size: 0.8rem;
  }
}

/* Print Styles */
@media print {
  .nav-tabs,
  .btn,
  .upload-zone,
  footer {
    display: none;
  }

  .answer-card {
    box-shadow: none;
    page-break-inside: avoid;
  }
}

/* High Contrast Mode */
@media (prefers-contrast: more) {
  :root {
    --color-primary: #FF6600;
    --color-dark: #000000;
  }

  button, input, select, textarea {
    border-width: 2px;
  }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}