frontend/src/App.css

:root {
  --bg-app: #0f172a;
  --bg-sidebar: #1e293b;
  --bg-panel: #1e293b;
  --bg-input: #334155;
  --border-color: #334155;
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --accent-gradient: linear-gradient(135deg, #3b82f6, #8b5cf6);
  
  --radius-lg: 12px;
  --radius-md: 8px;
  --radius-sm: 4px;
  
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

@keyframes glow-rotate {
  0% {
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.4),
                0 0 25px rgba(59, 130, 246, 0.6),
                0 0 50px rgba(59, 130, 246, 0.3),
                -10px 0 30px rgba(139, 92, 246, 0.4),
                var(--shadow-lg);
  }
  25% {
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.4),
                0 0 25px rgba(59, 130, 246, 0.6),
                0 0 50px rgba(59, 130, 246, 0.3),
                0 -10px 30px rgba(139, 92, 246, 0.4),
                var(--shadow-lg);
  }
  50% {
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.4),
                0 0 25px rgba(59, 130, 246, 0.6),
                0 0 50px rgba(59, 130, 246, 0.3),
                10px 0 30px rgba(139, 92, 246, 0.4),
                var(--shadow-lg);
  }
  75% {
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.4),
                0 0 25px rgba(59, 130, 246, 0.6),
                0 0 50px rgba(59, 130, 246, 0.3),
                0 10px 30px rgba(139, 92, 246, 0.4),
                var(--shadow-lg);
  }
  100% {
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.4),
                0 0 25px rgba(59, 130, 246, 0.6),
                0 0 50px rgba(59, 130, 246, 0.3),
                -10px 0 30px rgba(139, 92, 246, 0.4),
                var(--shadow-lg);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-app);
  color: var(--text-main);
  -webkit-font-smoothing: antialiased;
}

#root {
  height: 100vh;
  display: flex;
  overflow: hidden;
}

/* Layout */
.app-shell {
  display: grid;
  grid-template-columns: 280px 1fr;
  width: 100%;
  height: 100vh;
}

/* Sidebar */
.sidebar {
  background-color: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  overflow-y: auto;
  height: 100%;
  min-height: 0;
}

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

.brand h1 {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.sidebar-section h3 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

/* Dataset Controls */
.dataset-control {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

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

.input-group label {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.input-group input {
  background: var(--bg-app);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.5rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
}

.btn-secondary {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.5rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 0.875rem;
  transition: all 0.2s;
}

.btn-secondary:hover:not(:disabled) {
  background: var(--bg-input);
}

.btn-primary {
  background: var(--primary);
  border: none;
  color: white;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-weight: 500;
  transition: background 0.2s;
}

.btn-primary:hover:not(:disabled) {
  background: var(--primary-hover);
}

.upload-label {
  display: block;
  text-align: center;
  background: var(--bg-input);
  border: 1px dashed var(--text-muted);
  padding: 1rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 0.875rem;
  transition: all 0.2s;
}

.upload-label:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.upload-label input {
  display: none;
}

.dataset-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.dataset-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem;
  background: var(--bg-app);
  border-radius: var(--radius-md);
  font-size: 0.8rem;
}

.dataset-item strong {
  color: var(--primary);
}

/* Main Content */
.main-content {
  display: grid;
  grid-template-columns: 1fr 400px;
  overflow: hidden;
  height: 100%;
  min-height: 0;
}

/* Chat Area */
.chat-section {
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 0;
  position: relative;
  overflow: hidden;
}

.chat-header {
  padding: 1rem 2rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(8px);
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #22c55e;
}

.dot.busy {
  background-color: #eab308;
  animation: pulse 1.5s infinite;
}

@keyframes pulse {
  0% { opacity: 1; }
  50% { opacity: 0.5; }
  100% { opacity: 1; }
}

.messages-container {
  flex: 1;
  overflow-y: auto;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  min-height: 0;
  scroll-behavior: smooth;
}

.welcome-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  text-align: center;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}

.welcome-screen h2 {
  color: var(--text-main);
  font-size: 2rem;
  margin-bottom: 1rem;
}

.quick-prompts {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-top: 2rem;
  width: 100%;
}

.prompt-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  padding: 1rem;
  border-radius: var(--radius-lg);
  text-align: left;
  cursor: pointer;
  transition: all 0.2s;
}

.prompt-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
}

/* Messages */
.message {
  display: flex;
  gap: 1rem;
  max-width: 800px;
}

.message.user {
  flex-direction: row-reverse;
  align-self: flex-end;
}

.avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.message.agent .avatar {
  background: var(--primary);
  color: white;
}

.message.user .avatar {
  background: var(--text-muted);
  color: var(--bg-app);
}

.message-content {
  background: var(--bg-panel);
  padding: 1rem 1.5rem;
  border-radius: var(--radius-lg);
  border-top-left-radius: 2px;
  line-height: 1.6;
  font-size: 0.95rem;
}

.message.user .message-content {
  background: var(--primary);
  color: white;
  border-top-left-radius: var(--radius-lg);
  border-top-right-radius: 2px;
}

.input-area {
  padding: 2rem;
  background: linear-gradient(to top, var(--bg-app) 80%, transparent);
}

.input-wrapper {
  max-width: 1500px;
  margin: 0 auto;
  position: relative;
}
.input-shell {
  display: flex;
  align-items: flex-end;
  gap: 1rem;
  background: var(--bg-panel);
  border: 2px solid var(--border-color);
  padding: 1.5rem 1.5rem 1.5rem 2rem;
  border-radius: 999px;
  box-shadow: var(--shadow-lg);
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}

.input-shell:focus-within {
  border-color: var(--primary);
  animation: glow-rotate 3s ease-in-out infinite;
}

.input-wrapper textarea {
  flex: 1;
  width: 100%;
  background: transparent;
  border: none;
  padding: 0;
  border-radius: 0;
  color: var(--text-main);
  font-size: 1.05rem;
  resize: none;
  min-height: 50px;
  line-height: 1.6;
  overflow: hidden;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.input-wrapper textarea:focus {
  outline: none;
}

.send-btn {
  flex-shrink: 0;
  border: none;
  background: linear-gradient(135deg, #60a5fa, #8b5cf6);
  width: 80px;
  height: 56px;
  border-radius: 999px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 10px 25px rgba(99, 102, 241, 0.35);
  transition: transform 0.2s, box-shadow 0.2s, opacity 0.2s;
}

.send-btn svg {
  width: 26px;
  height: 26px;
  stroke: currentColor;
  fill: none;
}

.send-btn:hover:not(:disabled) {
  transform: translateX(2px) scale(1.02);
  box-shadow: 0 12px 28px rgba(99, 102, 241, 0.5);
}

.send-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Results Panel */
.results-section {
  background: var(--bg-sidebar);
  border-left: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 0;
  overflow: hidden;
}

.results-header {
  padding: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.results-header h2 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
}

.results-content {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-height: 0;
}

.result-card {
  background: var(--bg-app);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.badge {
  background: rgba(59, 130, 246, 0.1);
  color: var(--primary);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-size: 0.7rem;
}

.trend-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
  text-align: center;
}

.trend-grid div {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.trend-grid span {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.trend-grid strong {
  font-size: 1rem;
}

.anomaly-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.anomaly-list li {
  display: flex;
  justify-content: space-between;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.875rem;
}

.anomaly-list li:last-child {
  border-bottom: none;
}

code {
  display: block;
  background: #000;
  padding: 0.75rem;
  border-radius: var(--radius-sm);
  font-family: 'Fira Code', monospace;
  font-size: 0.8rem;
  overflow-x: auto;
  color: #a5b4fc;
}

.viz-container img {
  width: 100%;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

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

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
}

th, td {
  padding: 0.5rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

th {
  color: var(--text-muted);
  font-weight: 500;
}

.download-btn {
  display: block;
  width: 100%;
  text-align: center;
  background: var(--bg-input);
  color: var(--text-main);
  text-decoration: none;
  padding: 0.75rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  transition: background 0.2s;
}

.download-btn:hover {
  background: var(--border-color);
}

.empty-state-results {
  text-align: center;
  color: var(--text-muted);
  padding: 2rem;
  font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 1024px) {
  .main-content {
    grid-template-columns: 1fr;
  }
  .results-section {
    display: none; /* Or make it a modal/drawer */
  }
  .results-section.active {
    display: flex;
    position: fixed;
    inset: 0;
    z-index: 50;
  }
}

.viz-preview img {
  width: 100%;
  display: block;
}

.chart-summary {
  margin-top: 0.75rem;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.78);
}

.report-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: 0.75rem;
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
  text-decoration: none;
  color: #1b1d34;
  background: #9ef4c5;
  font-weight: 600;
}

.diagnostic-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.6rem;
}

.diagnostic-chip {
  font-size: 0.75rem;
  border-radius: 999px;
  padding: 0.25rem 0.7rem;
  border: 1px solid rgba(255, 255, 255, 0.3);
  background: rgba(255, 255, 255, 0.08);
}

.input-area {
  margin-top: 1.5rem;
  display: flex;
  gap: 0.75rem;
}

.input-area input {
  flex: 1;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.04);
  color: inherit;
  padding: 0.95rem 1.4rem;
  font-size: 1.05rem;
}

.input-area input:focus {
  outline: none;
  border-color: rgba(122, 131, 255, 0.6);
}

.input-area button {
  border: none;
  border-radius: 999px;
  padding: 0.95rem 1.8rem;
  background: linear-gradient(135deg, #7a83ff, #5cd4f4);
  color: #05070f;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease;
}

.input-area button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.input-area button:not(:disabled):hover {
  transform: translateY(-1px);
}

.error-text {
  margin-top: 0.75rem;
  color: #ffb4b4;
  font-size: 0.9rem;
}

.result-stack {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.insight-card {
  background: rgba(158, 244, 197, 0.08);
  border: 1px solid rgba(158, 244, 197, 0.4);
  border-radius: 16px;
  padding: 1rem 1.2rem;
  color: #d4ffe7;
}

.meta-card {
  border-radius: 16px;
  padding: 1rem 1.2rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.03);
}

.trend-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  gap: 0.75rem;
  margin-top: 0.75rem;
}

.trend-grid span {
  display: block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.5);
}

.trend-grid strong {
  display: block;
  font-size: 1.1rem;
}

.anomaly-list {
  list-style: none;
  margin: 0.75rem 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.anomaly-list li {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.85);
}

.anomaly-list li strong {
  color: #ffffff;
}

.meta-head {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.65);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.badge {
  padding: 0.1rem 0.6rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.meta-card code {
  display: block;
  margin-top: 0.5rem;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  color: #9bd0ff;
  white-space: pre-wrap;
}

.data-preview {
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.09);
  background: rgba(1, 2, 15, 0.4);
  padding: 1rem;
}

.table-wrapper {
  overflow-x: auto;
  margin-top: 0.75rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

th,
td {
  padding: 0.55rem 0.75rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  text-align: left;
}

th {
  font-weight: 600;
  color: rgba(255, 255, 255, 0.7);
}

.viz-card {
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.09);
  background: rgba(255, 255, 255, 0.03);
  padding: 1rem;
}

.viz-card img {
  width: 100%;
  border-radius: 12px;
}

.report-button {
  display: inline-flex;
  justify-content: center;
  padding: 0.9rem 1.5rem;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 600;
  background: linear-gradient(135deg, #4ade80, #22d3ee);
  color: #041019;
}

.empty-state {
  padding: 2rem;
  text-align: center;
  color: rgba(255, 255, 255, 0.6);
}

@media (max-width: 1100px) {
  .dashboard {
    grid-template-columns: 1fr;
  }

  .messages-area {
    max-height: 45vh;
  }
}

@media (max-width: 600px) {
  .app-shell {
    padding: 2rem 1rem 3rem;
  }

  .panel {
    padding: 1.25rem;
  }

  .bubble {
    max-width: 100%;
  }
}