:root {
  --bg-main: #0b0f19;
  --bg-card: #131b2e;
  --bg-card-hover: #19233c;
  --bg-input: #0e1526;
  --border-color: #23314e;
  --border-focus: #3b82f6;
  
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --accent-cyan: #06b6d4;
  --accent-cyan-bg: rgba(6, 182, 212, 0.12);
  --accent-cyan-border: rgba(6, 182, 212, 0.35);
  
  --accent-violet: #8b5cf6;
  --accent-violet-bg: rgba(139, 92, 246, 0.12);
  --accent-violet-border: rgba(139, 92, 246, 0.35);

  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #ef4444;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 15px rgba(6, 182, 212, 0.25);
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 20px;
  width: 100%;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* Header */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.logo-badge {
  background: linear-gradient(135deg, #06b6d4, #3b82f6);
  color: #fff;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  font-size: 1.3rem;
  padding: 8px 12px;
  border-radius: var(--radius-md);
  box-shadow: 0 4px 12px rgba(6, 182, 212, 0.3);
}

.brand h1 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand .tag {
  font-size: 0.75rem;
  padding: 2px 6px;
  background-color: #1e293b;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
}

.subtitle {
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* System Telemetry Badge */
.system-status-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 8px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  font-weight: 600;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--text-dim);
}

.status-dot.online {
  background-color: var(--accent-emerald);
  box-shadow: 0 0 8px var(--accent-emerald);
  animation: pulse 2s infinite;
}

.status-dot.offline {
  background-color: var(--accent-rose);
}

@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.15); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

.status-metadata {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
}

.badge-offline {
  background-color: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
  padding: 1px 6px;
  border-radius: 4px;
}

/* Tabs Navigation */
.tabs-nav {
  display: flex;
  gap: 6px;
  margin-bottom: -1px;
  overflow-x: auto;
  padding-bottom: 2px;
}

.tab-btn {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-bottom: none;
  color: var(--text-muted);
  padding: 10px 18px;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.tab-btn:hover {
  background-color: var(--bg-card-hover);
  color: var(--text-main);
}

.tab-btn.active {
  background-color: var(--bg-card);
  border-color: var(--border-color);
  border-top: 2px solid var(--accent-cyan);
  color: #fff;
  box-shadow: 0 -2px 10px rgba(6, 182, 212, 0.15);
}

.tab-pane {
  display: none;
}

.tab-pane.active {
  display: block;
}

.pane-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 8px;
}

.pane-header h2 {
  font-size: 1.15rem;
  font-weight: 600;
}

.pane-header .hint {
  font-size: 0.82rem;
  color: var(--text-dim);
}

/* Dropzone Area */
.dropzone-area {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  background-color: var(--bg-input);
  transition: all 0.2s ease;
  margin-bottom: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.dropzone-area.dragover {
  border-color: var(--accent-cyan);
  background-color: var(--accent-cyan-bg);
}

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

.dropzone-text p {
  font-size: 0.95rem;
  color: var(--text-main);
}

.dropzone-sub {
  font-size: 0.8rem;
  color: var(--text-dim);
}

.dropzone-actions {
  display: flex;
  gap: 10px;
  margin-top: 6px;
  flex-wrap: wrap;
  justify-content: center;
}

/* Metrics Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.metric-card {
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px;
  border-left: 3px solid var(--accent-cyan);
}

.metric-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  margin-bottom: 4px;
}

.metric-value {
  font-size: 1.25rem;
  font-weight: 700;
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-main);
}

.metric-sub {
  font-size: 0.75rem;
  color: var(--accent-cyan);
  font-family: 'JetBrains Mono', monospace;
  margin-top: 2px;
}

/* Workload Builder */
.workload-builder-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 16px;
}

.workload-builder-grid .full-width {
  grid-column: span 2;
}

@media (max-width: 700px) {
  .workload-builder-grid {
    grid-template-columns: 1fr;
  }
  .workload-builder-grid .full-width {
    grid-column: span 1;
  }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
}

.form-control {
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-size: 0.88rem;
  color: var(--text-main);
  outline: none;
  font-family: 'Inter', sans-serif;
}

.form-control:focus {
  border-color: var(--border-focus);
}

.textarea-label {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 6px;
  display: block;
}

/* Workspace Cards */
.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-md);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 10px;
}

.card-header h2 {
  font-size: 1.15rem;
  font-weight: 600;
}

.card-header .hint {
  font-size: 0.82rem;
  color: var(--text-dim);
}

/* Preset Chips */
.presets-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.preset-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
}

.preset-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.preset-chip {
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 4px 10px;
  font-size: 0.78rem;
  border-radius: 20px;
  cursor: pointer;
  transition: all 0.15s ease;
  font-family: 'Inter', sans-serif;
}

.preset-chip:hover {
  background-color: var(--bg-card-hover);
  border-color: var(--accent-cyan);
  color: var(--text-main);
  transform: translateY(-1px);
}

.upload-action {
  margin-left: auto;
}

.btn-hwinfo {
  background-color: rgba(6, 182, 212, 0.08);
  border-color: rgba(6, 182, 212, 0.3);
  color: var(--accent-cyan);
  font-weight: 500;
}

.btn-hwinfo:hover {
  background-color: rgba(6, 182, 212, 0.18);
  border-color: var(--accent-cyan);
  color: #fff;
}

.file-status-badge {
  background-color: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.3);
  border-radius: var(--radius-sm);
  padding: 6px 12px;
  font-size: 0.8rem;
  color: var(--accent-cyan);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: 'JetBrains Mono', monospace;
}

/* Input Area */
.input-wrapper textarea {
  width: 100%;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px;
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  color: var(--text-main);
  resize: vertical;
  transition: border-color 0.15s ease;
  outline: none;
}

.input-wrapper textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

.input-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 14px;
  flex-wrap: wrap;
  gap: 12px;
}

.mode-selector {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.mode-selector select {
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  outline: none;
  font-size: 0.85rem;
  cursor: pointer;
}

.button-group {
  display: flex;
  gap: 10px;
}

.btn {
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.15s ease;
}

.btn-primary {
  background: linear-gradient(135deg, #06b6d4, #2563eb);
  color: #fff;
  box-shadow: 0 2px 8px rgba(6, 182, 212, 0.3);
}

.btn-primary:hover:not(:disabled) {
  opacity: 0.95;
  box-shadow: 0 4px 12px rgba(6, 182, 212, 0.45);
  transform: translateY(-1px);
}

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

.btn-secondary {
  background-color: var(--bg-input);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background-color: var(--bg-card-hover);
  color: var(--text-main);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
}

.btn-outline:hover {
  border-color: var(--text-muted);
  color: var(--text-main);
}

.btn-sm {
  padding: 4px 10px;
  font-size: 0.78rem;
}

.btn-spinner {
  width: 14px;
  height: 14px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  display: none;
}

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

.results-title-group {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.telemetry-pill {
  font-size: 0.72rem;
  color: var(--accent-cyan);
  background-color: var(--accent-cyan-bg);
  border: 1px solid var(--accent-cyan-border);
  padding: 3px 10px;
  border-radius: 6px;
  font-family: 'JetBrains Mono', monospace;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.results-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.status-pill {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 3px 10px;
  border-radius: 12px;
  font-family: 'JetBrains Mono', monospace;
}

.status-pill.status-ok {
  background-color: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.status-pill.status-needs_more_info {
  background-color: rgba(245, 158, 11, 0.15);
  color: var(--accent-amber);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.status-pill.status-safety_alert {
  background-color: rgba(239, 68, 68, 0.15);
  color: var(--accent-rose);
  border: 1px solid rgba(239, 68, 68, 0.4);
}

/* Banners */
.safety-banner {
  background-color: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.35);
  border-radius: var(--radius-md);
  padding: 14px;
  margin-bottom: 20px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

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

.safety-body h3 {
  color: var(--accent-rose);
  font-size: 0.95rem;
  margin-bottom: 4px;
}

.safety-body p {
  font-size: 0.88rem;
  color: var(--text-main);
}

.needs-info-banner {
  background-color: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.35);
  border-radius: var(--radius-md);
  padding: 14px;
  margin-bottom: 20px;
  display: flex;
  gap: 12px;
}

.needs-info-icon {
  font-size: 1.5rem;
}

.needs-info-body h3 {
  color: var(--accent-amber);
  font-size: 0.95rem;
  margin-bottom: 4px;
}

.needs-info-body p {
  font-size: 0.88rem;
  color: var(--text-main);
  margin-bottom: 8px;
}

.follow-up-list {
  padding-left: 20px;
  font-size: 0.88rem;
  color: var(--text-main);
}

.follow-up-list li {
  margin-bottom: 4px;
}

.follow-up-list li.interactive-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 6px 0;
  border-bottom: 1px dashed rgba(245, 158, 11, 0.2);
}

.follow-up-list li.interactive-question:last-child {
  border-bottom: none;
}

.btn-answer {
  color: var(--accent-amber);
  border-color: rgba(245, 158, 11, 0.4);
  font-size: 0.72rem;
  padding: 2px 8px;
  flex-shrink: 0;
}

.btn-answer:hover {
  background-color: rgba(245, 158, 11, 0.2);
  border-color: var(--accent-amber);
  color: #fff;
}

/* Section Blocks */
.section-block {
  margin-bottom: 24px;
}

.section-title {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.tooltip-trigger {
  cursor: help;
  color: var(--text-dim);
  font-size: 0.78rem;
}

.symptom-summary-text {
  font-size: 1rem;
  color: var(--text-main);
  background-color: var(--bg-input);
  padding: 12px 16px;
  border-radius: var(--radius-md);
  border-left: 4px solid var(--accent-cyan);
}

/* Split Diagnostic Grid */
.diagnostic-grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 20px;
  margin-bottom: 24px;
}

@media (max-width: 820px) {
  .diagnostic-grid {
    grid-template-columns: 1fr;
  }
}

.evidence-list, .causes-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* Evidence Cards */
.evidence-card {
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px;
  transition: all 0.2s ease;
  cursor: default;
}

.evidence-card.evidence-highlighted {
  border-color: var(--accent-cyan);
  background-color: var(--accent-cyan-bg);
  box-shadow: var(--shadow-glow);
  transform: translateX(4px);
}

.evidence-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
}

.evidence-badge {
  background-color: var(--accent-cyan-bg);
  color: var(--accent-cyan);
  border: 1px solid var(--accent-cyan-border);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 4px;
}

.evidence-text {
  font-size: 0.88rem;
  color: var(--text-main);
  font-style: italic;
}

/* Cause Cards */
.cause-card {
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.cause-card.cause-highlighted {
  border-color: var(--accent-violet);
  background-color: var(--accent-violet-bg);
  box-shadow: 0 0 15px rgba(139, 92, 246, 0.25);
  transform: translateX(4px);
}

.cause-top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.cause-id-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.cause-badge {
  background-color: var(--accent-violet-bg);
  color: var(--accent-violet);
  border: 1px solid var(--accent-violet-border);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 4px;
}

.cause-evidence-tags {
  display: flex;
  gap: 4px;
}

.cause-evidence-tag {
  background-color: var(--accent-cyan-bg);
  color: var(--accent-cyan);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  padding: 0 4px;
  border-radius: 3px;
  border: 1px solid var(--accent-cyan-border);
}

.confidence-badge {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 1px 8px;
  border-radius: 10px;
  text-transform: capitalize;
}

.confidence-high {
  background-color: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
}

.confidence-medium {
  background-color: rgba(245, 158, 11, 0.15);
  color: var(--accent-amber);
}

.confidence-low {
  background-color: rgba(100, 116, 139, 0.2);
  color: var(--text-muted);
}

.cause-desc {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-main);
}

.cause-verification {
  font-size: 0.8rem;
  color: var(--text-muted);
  background-color: rgba(0, 0, 0, 0.25);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  border-left: 2px solid var(--accent-violet);
}

.cause-verification strong {
  color: var(--accent-violet);
}

/* Steps List */
.steps-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.step-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px 16px;
}

.step-num-badge {
  background-color: #23314e;
  color: var(--text-main);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  font-weight: 700;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.step-content {
  flex: 1;
}

.step-action {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-main);
  margin-bottom: 2px;
}

.step-rationale {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.step-risk-badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 1px 6px;
  border-radius: 4px;
  text-transform: uppercase;
  font-family: 'JetBrains Mono', monospace;
  flex-shrink: 0;
}

.risk-none {
  background-color: rgba(16, 185, 129, 0.1);
  color: var(--accent-emerald);
}

.risk-low {
  background-color: rgba(6, 182, 212, 0.1);
  color: var(--accent-cyan);
}

.risk-medium {
  background-color: rgba(245, 158, 11, 0.1);
  color: var(--accent-amber);
}

.risk-high {
  background-color: rgba(239, 68, 68, 0.1);
  color: var(--accent-rose);
}

/* Footer */
.footer {
  margin-top: auto;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
  font-size: 0.8rem;
  color: var(--text-dim);
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.footer strong {
  color: var(--text-muted);
}