frontend/src/App.css

:root {
  --bg-color: #0b0c10;
  --bg-card: rgba(22, 24, 33, 0.7);
  --bg-card-hover: rgba(30, 33, 45, 0.8);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(99, 102, 241, 0.15);
  
  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  
  --primary: #6366f1;
  --primary-glow: rgba(99, 102, 241, 0.35);
  --primary-dark: #4f46e5;
  --secondary: #a855f7;
  
  /* Sentiment Colors */
  --color-happy: #10b981;
  --color-happy-bg: rgba(16, 185, 129, 0.1);
  --color-sad: #0ea5e9;
  --color-sad-bg: rgba(14, 165, 233, 0.1);
  --color-frustrated: #f43f5e;
  --color-frustrated-bg: rgba(244, 63, 94, 0.1);
  --color-neutral: #f59e0b;
  --color-neutral-bg: rgba(245, 158, 11, 0.1);
  
  --font-family: 'Inter', system-ui, -apple-system, sans-serif;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  background-color: var(--bg-color);
  color: var(--text-primary);
  font-family: var(--font-family);
  min-height: 100vh;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 10% 20%, rgba(99, 102, 241, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 90% 80%, rgba(168, 85, 247, 0.08) 0%, transparent 40%);
  background-attachment: fixed;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.2);
}
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* App Container */
.app-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  min-height: 100vh;
}

/* Header */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1.5rem;
}

.header-title-section h1 {
  font-size: 2.2rem;
  font-weight: 800;
  background: linear-gradient(135deg, #fff 30%, #a855f7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.5px;
}

.header-title-section p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-top: 0.4rem;
}

.header-status {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.status-badge {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  padding: 0.4rem 0.8rem;
  border-radius: 9999px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
}

.status-dot.loading {
  background-color: var(--color-neutral);
  box-shadow: 0 0 8px var(--color-neutral);
  animation: pulse 1.5s infinite;
}

.status-dot.ready {
  background-color: var(--color-happy);
  box-shadow: 0 0 8px var(--color-happy);
}

.status-dot.failed {
  background-color: var(--color-frustrated);
  box-shadow: 0 0 8px var(--color-frustrated);
}

/* Settings Bar */
.settings-toggle-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  transition: var(--transition);
}

.settings-toggle-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--primary);
}

.settings-drawer {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  animation: slideDown 0.3s ease-out;
}

.settings-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.settings-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.settings-group input, .settings-group textarea {
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  padding: 0.75rem 1rem;
  font-family: inherit;
  font-size: 0.95rem;
  transition: var(--transition);
}

.settings-group input:focus, .settings-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 10px var(--primary-glow);
}

/* Main Layout Grid */
.main-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

/* Query Input Section */
.query-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  position: relative;
  overflow: hidden;
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.2);
}

.query-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
}

.query-input-wrapper {
  display: flex;
  gap: 1rem;
}

.query-textarea {
  flex: 1;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  color: var(--text-primary);
  padding: 1rem;
  font-family: inherit;
  font-size: 1.05rem;
  resize: vertical;
  min-height: 80px;
  transition: var(--transition);
}

.query-textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 12px var(--primary-glow);
}

.send-button {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  border: none;
  color: white;
  border-radius: 12px;
  padding: 0 1.8rem;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  transition: var(--transition);
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.3);
}

.send-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
}

.send-button:disabled {
  background: var(--text-muted);
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

/* Quick Prompts */
.quick-prompts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
}

.quick-prompt-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
}

.quick-prompt-btn {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.4rem 0.8rem;
  border-radius: 20px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: var(--transition);
}

.quick-prompt-btn:hover {
  background: rgba(99, 102, 241, 0.1);
  border-color: var(--primary);
  color: var(--text-primary);
}

/* Chat Comparison Columns */
.comparison-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 900px) {
  .comparison-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1300px) {
  .comparison-grid {
    grid-template-columns: 1fr 1fr 1fr 1fr;
  }
}

.column-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  display: flex;
  flex-direction: column;
  min-height: 500px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
  overflow: hidden;
  transition: var(--transition);
}

.column-card:hover {
  border-color: rgba(255, 255, 255, 0.12);
  box-shadow: 0 15px 50px rgba(0, 0, 0, 0.4);
}

.column-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.8rem;
  background: rgba(0, 0, 0, 0.15);
}

.column-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.column-title-wrapper h2 {
  font-size: 1.15rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.column-title-wrapper p {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

.latency-badge {
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.75rem;
  padding: 0.3rem 0.6rem;
  border-radius: 6px;
  font-family: monospace;
  white-space: nowrap;
}

/* Sentiment Details Badge */
.sentiment-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.8rem;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.sentiment-badge.happy {
  background-color: var(--color-happy-bg);
  border: 1px solid var(--color-happy);
  color: var(--color-happy);
}

.sentiment-badge.sad {
  background-color: var(--color-sad-bg);
  border: 1px solid var(--color-sad);
  color: var(--color-sad);
}

.sentiment-badge.frustrated {
  background-color: var(--color-frustrated-bg);
  border: 1px solid var(--color-frustrated);
  color: var(--color-frustrated);
}

.sentiment-badge.neutral {
  background-color: var(--color-neutral-bg);
  border: 1px solid var(--color-neutral);
  color: var(--color-neutral);
}

/* Chat Body Response */
.column-body {
  padding: 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  overflow-y: auto;
}

.sentiment-analysis-box {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1rem;
}

.sentiment-analysis-box h3 {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.5rem;
}

.sentiment-analysis-box p {
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--text-secondary);
}

.chat-response-content {
  flex: 1;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-primary);
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  padding-top: 1.5rem;
}

.chat-response-content p {
  margin-bottom: 1rem;
}

.chat-response-content ul, .chat-response-content ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

.chat-response-content li {
  margin-bottom: 0.4rem;
}

.chat-response-content code {
  background: rgba(0, 0, 0, 0.3);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  font-family: monospace;
  font-size: 0.9rem;
}

.chat-response-content pre {
  background: rgba(0, 0, 0, 0.4);
  padding: 1rem;
  border-radius: 8px;
  overflow-x: auto;
  margin: 1rem 0;
  border: 1px solid var(--border-color);
}

.chat-response-content pre code {
  background: transparent;
  padding: 0;
}

/* Prompt Context Inspector */
.inspector-section {
  border-top: 1px solid var(--border-color);
  background: rgba(0, 0, 0, 0.2);
}

.inspector-header {
  padding: 0.75rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  user-select: none;
  transition: var(--transition);
}

.inspector-header:hover {
  background: rgba(255, 255, 255, 0.02);
}

.inspector-header span {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.inspector-body {
  padding: 1.2rem 1.5rem;
  border-top: 1px solid var(--border-color);
  background: rgba(0, 0, 0, 0.3);
  font-family: monospace;
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--text-secondary);
  white-space: pre-wrap;
  max-height: 250px;
  overflow-y: auto;
  animation: slideDown 0.2s ease-out;
}

/* RoBERTa Custom Emotion List & Chart */
.emotion-chart-container {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 0.8rem;
}

.emotion-bar-row {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.emotion-bar-label {
  width: 110px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-align: right;
  text-transform: capitalize;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.emotion-bar-track {
  flex: 1;
  height: 8px;
  background: rgba(255, 255, 255, 0.04);
  border-radius: 4px;
  overflow: hidden;
  position: relative;
}

.emotion-bar-fill {
  height: 100%;
  border-radius: 4px;
  transition: width 0.8s cubic-bezier(0.1, 0.8, 0.2, 1);
}

.emotion-bar-value {
  width: 45px;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: monospace;
}

/* Loading Skeletons */
.skeleton-wrapper {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  width: 100%;
}

.skeleton-line {
  height: 16px;
  background: linear-gradient(90deg, rgba(255,255,255,0.03) 25%, rgba(255,255,255,0.08) 50%, rgba(255,255,255,0.03) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 4px;
}

.skeleton-line.short { width: 40%; }
.skeleton-line.medium { width: 70%; }
.skeleton-line.long { width: 100%; }

.skeleton-box {
  height: 80px;
  background: linear-gradient(90deg, rgba(255,255,255,0.03) 25%, rgba(255,255,255,0.08) 50%, rgba(255,255,255,0.03) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 8px;
}

/* Animations */
@keyframes pulse {
  0% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.15); opacity: 0.6; }
  100% { transform: scale(1); opacity: 1; }
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Empty State / Welcome Screen */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4rem 2rem;
  text-align: center;
  color: var(--text-secondary);
  gap: 1rem;
  flex: 1;
}

.empty-state-icon {
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.empty-state h3 {
  font-size: 1.3rem;
  color: var(--text-primary);
  font-weight: 600;
}

.empty-state p {
  max-width: 500px;
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--text-muted);
}