:root {
  --bg-primary: #090d16;
  --bg-secondary: #111726;
  --bg-tertiary: #1b2336;
  --bg-card: #151d30;
  --bg-card-hover: #1c2742;
  --border-color: #243049;
  --border-light: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --accent-blue: #38bdf8;
  --accent-blue-glow: rgba(56, 189, 248, 0.25);
  --accent-green: #10b981;
  --accent-green-glow: rgba(16, 185, 129, 0.25);
  --accent-purple: #a855f7;
  --accent-purple-glow: rgba(168, 85, 247, 0.25);
  --accent-yellow: #f59e0b;
  --accent-yellow-glow: rgba(245, 158, 11, 0.25);
  --accent-red: #ef4444;
  --accent-red-glow: rgba(239, 68, 68, 0.25);

  --diff-del-bg: rgba(239, 68, 68, 0.18);
  --diff-del-border: rgba(239, 68, 68, 0.35);
  --diff-del-text: #fca5a5;
  --diff-add-bg: rgba(16, 185, 129, 0.20);
  --diff-add-border: rgba(16, 185, 129, 0.4);
  --diff-add-text: #6ee7b7;
  --diff-invariant-bg: rgba(56, 189, 248, 0.15);
  --diff-invariant-border: rgba(56, 189, 248, 0.4);
  --diff-invariant-text: #7dd3fc;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 18px;
  
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
  overflow-x: hidden;
}

.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ==========================================================================
   Navbar
   ========================================================================== */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.85rem 2rem;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.logo-badge {
  font-size: 1.5rem;
  background: linear-gradient(135deg, #0284c7, #8b5cf6);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  box-shadow: 0 0 16px var(--accent-blue-glow);
  flex-shrink: 0;
}

.logo-title-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.navbar h1 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  background: linear-gradient(90deg, #f8fafc, #94a3b8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subtitle {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.navbar-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.backend-status-pill {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.backend-status-pill:hover {
  border-color: var(--accent-blue);
  background-color: var(--bg-card-hover);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-yellow);
  display: inline-block;
  box-shadow: 0 0 8px var(--accent-yellow-glow);
  transition: background-color 0.3s;
}

.status-dot.connected {
  background-color: var(--accent-green);
  box-shadow: 0 0 8px var(--accent-green-glow);
}

.status-dot.error {
  background-color: var(--accent-red);
  box-shadow: 0 0 8px var(--accent-red-glow);
}

.status-text {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 500;
  color: var(--text-primary);
}

.settings-gear {
  font-size: 0.85rem;
  opacity: 0.7;
}

.version-tag {
  background-color: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.3);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-family: 'JetBrains Mono', monospace;
  color: var(--accent-blue);
}

/* ==========================================================================
   Main Layout & Panels
   ========================================================================== */
.main-layout {
  display: grid;
  grid-template-columns: 1fr 1.35fr;
  gap: 1.5rem;
  padding: 1.5rem 2rem;
  flex: 1;
  max-width: 1800px;
  margin: 0 auto;
  width: 100%;
}

.panel {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.2s;
}

.panel:hover {
  border-color: rgba(56, 189, 248, 0.3);
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.panel-title-group {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.panel-step-badge {
  background: var(--bg-tertiary);
  color: var(--accent-blue);
  border: 1px solid var(--border-color);
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  font-family: 'JetBrains Mono', monospace;
}

.panel-header h2 {
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.3px;
}

.badge {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  background-color: var(--bg-tertiary);
  color: var(--accent-blue);
  border: 1px solid var(--border-color);
}

.badge-accent {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.15), rgba(168, 85, 247, 0.15));
  border-color: rgba(168, 85, 247, 0.4);
  color: #c084fc;
  font-size: 0.7rem;
}

.badge-tokens {
  background-color: rgba(56, 189, 248, 0.12);
  color: var(--accent-blue);
  border-color: rgba(56, 189, 248, 0.3);
}

.badge-words {
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
}

.badge-success {
  background-color: rgba(16, 185, 129, 0.15);
  color: var(--accent-green);
  border-color: rgba(16, 185, 129, 0.4);
}

.badge-winner {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.2), rgba(16, 185, 129, 0.2));
  color: #fbbf24;
  border-color: rgba(245, 158, 11, 0.4);
  font-weight: 600;
}

.token-badge-group {
  display: flex;
  gap: 0.4rem;
}

/* ==========================================================================
   Presets Bar
   ========================================================================== */
.presets-bar {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.85rem;
  flex-wrap: wrap;
}

.presets-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.preset-pills {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.preset-pill {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.preset-pill:hover {
  background-color: var(--bg-card-hover);
  border-color: var(--accent-blue);
  color: var(--text-primary);
  transform: translateY(-1px);
}

/* ==========================================================================
   Input Textarea & Controls
   ========================================================================== */
.textarea-wrapper {
  position: relative;
  margin-bottom: 1.25rem;
}

textarea {
  width: 100%;
  height: 290px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.88rem;
  padding: 1rem;
  padding-bottom: 2.8rem;
  resize: vertical;
  line-height: 1.6;
  transition: border-color 0.2s, box-shadow 0.2s;
}

textarea:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px var(--accent-blue-glow);
}

.textarea-actions {
  position: absolute;
  bottom: 0.8rem;
  right: 0.8rem;
  display: flex;
  gap: 0.5rem;
}

.icon-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.25rem 0.55rem;
  border-radius: var(--radius-sm);
  font-size: 0.72rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

.icon-btn:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  border-color: var(--border-light);
}

.controls-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.control-group label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.tooltip-icon {
  font-size: 0.75rem;
  cursor: help;
  opacity: 0.7;
}

select, input[type="text"] {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  outline: none;
  transition: border-color 0.2s;
}

select:focus, input[type="text"]:focus {
  border-color: var(--accent-blue);
}

.advanced-settings-details {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  margin-bottom: 1.25rem;
  overflow: hidden;
}

.advanced-settings-details summary {
  padding: 0.6rem 0.9rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
}

.advanced-settings-details summary:hover {
  color: var(--text-primary);
}

.advanced-settings-body {
  padding: 0.8rem 0.9rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.input-with-action {
  display: flex;
  gap: 0.5rem;
}

.input-with-action input {
  flex: 1;
}

.help-text {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.help-text code {
  background: var(--bg-tertiary);
  padding: 0.1rem 0.3rem;
  border-radius: 3px;
  color: var(--accent-blue);
}

/* Action Bar & Buttons */
.action-bar {
  display: flex;
  gap: 0.85rem;
  margin-top: auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.2s ease;
  user-select: none;
}

.btn-primary {
  background: linear-gradient(135deg, #0284c7, #10b981);
  color: white;
  flex: 2;
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.3);
}

.btn-primary:hover:not(:disabled) {
  opacity: 0.95;
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(2, 132, 199, 0.4);
}

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

.btn-secondary {
  background-color: var(--bg-tertiary);
  border-color: var(--border-color);
  color: var(--text-primary);
  flex: 1.2;
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--bg-card-hover);
  border-color: var(--border-light);
}

.btn-sm {
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
  background-color: var(--bg-tertiary);
  border-color: var(--border-color);
  color: var(--text-primary);
  border-radius: var(--radius-sm);
}

.btn-sm:hover {
  background-color: var(--bg-card-hover);
  border-color: var(--accent-blue);
}

.btn-kbd {
  font-size: 0.68rem;
  background: rgba(0, 0, 0, 0.25);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-family: 'JetBrains Mono', monospace;
  margin-left: 0.4rem;
  opacity: 0.8;
}

/* ==========================================================================
   Pipeline Stepper Tracker
   ========================================================================== */
.pipeline-stepper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  background-color: var(--bg-primary);
  padding: 0.6rem 0.8rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  overflow-x: auto;
}

.step {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.78rem;
  color: var(--text-muted);
  cursor: default;
  transition: all 0.25s ease;
  white-space: nowrap;
}

.step-num {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 700;
  font-family: 'JetBrains Mono', monospace;
  transition: all 0.25s ease;
}

.step-connector {
  flex: 1;
  height: 1px;
  background-color: var(--border-color);
  margin: 0 0.5rem;
  min-width: 10px;
}

.step.active {
  color: var(--accent-blue);
  font-weight: 600;
}

.step.active .step-num {
  background-color: var(--accent-blue);
  border-color: var(--accent-blue);
  color: #000;
  box-shadow: 0 0 10px var(--accent-blue-glow);
  animation: pulseStep 1.2s infinite ease-in-out;
}

@keyframes pulseStep {
  0% { transform: scale(1); }
  50% { transform: scale(1.15); }
  100% { transform: scale(1); }
}

.step.completed {
  color: var(--accent-green);
}

.step.completed .step-num {
  background-color: var(--accent-green);
  border-color: var(--accent-green);
  color: white;
}

/* ==========================================================================
   Metrics Dashboard
   ========================================================================== */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.85rem;
  margin-bottom: 1.25rem;
}

.metric-card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.9rem;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  transition: transform 0.2s, border-color 0.2s;
}

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

.metric-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.2rem;
}

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

.metric-icon {
  font-size: 0.85rem;
  opacity: 0.8;
}

.metric-value {
  font-size: 1.45rem;
  font-weight: 700;
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: -0.5px;
  line-height: 1.2;
}

.metric-value.highlight {
  color: var(--accent-green);
}

.metric-value.success {
  color: var(--accent-blue);
}

.metric-value.warning {
  color: var(--accent-yellow);
}

.metric-sub {
  font-size: 0.7rem;
  color: var(--text-secondary);
  margin-top: 0.2rem;
}

.metric-tag {
  display: inline-block;
  margin-top: 0.4rem;
  font-size: 0.65rem;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.mini-progress-bar {
  width: 100%;
  height: 4px;
  background-color: var(--bg-tertiary);
  border-radius: 999px;
  margin-top: 0.6rem;
  overflow: hidden;
}

.mini-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #0284c7, #10b981);
  border-radius: 999px;
  transition: width 0.8s ease-out;
}

.mini-progress-fill.quality-fill {
  background: linear-gradient(90deg, #a855f7, #38bdf8);
}

/* ==========================================================================
   ROI Cost Calculator
   ========================================================================== */
.roi-calculator-card {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.06), rgba(56, 189, 248, 0.06));
  border: 1px solid rgba(16, 185, 129, 0.25);
  border-radius: var(--radius-md);
  padding: 0.9rem 1.1rem;
  margin-bottom: 1.25rem;
}

.roi-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.roi-title {
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.roi-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.roi-controls label {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.roi-controls select {
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
}

.roi-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
}

.roi-item {
  display: flex;
  flex-direction: column;
  background: var(--bg-primary);
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.roi-model {
  font-size: 0.68rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.roi-savings {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--accent-green);
  margin-top: 0.15rem;
}

.roi-tokens {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-blue);
  margin-top: 0.25rem;
}

/* ==========================================================================
   Output Container & Rich Visual Diffs
   ========================================================================== */
.output-container {
  margin-bottom: 1.25rem;
}

.output-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.6rem;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.view-mode-tabs {
  display: flex;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  padding: 0.25rem;
  border-radius: var(--radius-sm);
  gap: 0.25rem;
}

.view-tab-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.35rem 0.75rem;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s ease;
}

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

.view-tab-btn.active {
  background-color: var(--bg-tertiary);
  color: var(--accent-blue);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.output-actions {
  display: flex;
  gap: 0.5rem;
}

.diff-view-pane {
  display: none;
}

.diff-view-pane.active {
  display: block;
}

/* Side-by-Side Diff Grid */
.diff-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
}

.diff-column {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.diff-column-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0.85rem;
  background-color: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-color);
}

.diff-badge {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
}

.del-badge {
  background-color: rgba(239, 68, 68, 0.2);
  color: #fca5a5;
  border: 1px solid rgba(239, 68, 68, 0.4);
}

.add-badge {
  background-color: rgba(16, 185, 129, 0.2);
  color: #6ee7b7;
  border: 1px solid rgba(16, 185, 129, 0.4);
}

.diff-count {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  color: var(--text-muted);
}

.diff-content {
  padding: 1rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  line-height: 1.7;
  color: #e2e8f0;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 340px;
  overflow-y: auto;
}

/* Highlighted Tokens in Diff */
.diff-del {
  background-color: var(--diff-del-bg);
  border-bottom: 2px solid var(--diff-del-border);
  color: var(--diff-del-text);
  text-decoration: line-through;
  padding: 0.05rem 0.25rem;
  border-radius: 3px;
  margin: 0 1px;
}

.diff-add {
  background-color: var(--diff-add-bg);
  border-bottom: 2px solid var(--diff-add-border);
  color: var(--diff-add-text);
  font-weight: 500;
  padding: 0.05rem 0.25rem;
  border-radius: 3px;
  margin: 0 1px;
}

.diff-invariant-tag {
  background-color: var(--diff-invariant-bg);
  border: 1px solid var(--diff-invariant-border);
  color: var(--diff-invariant-text);
  font-weight: 600;
  padding: 0.05rem 0.35rem;
  border-radius: 4px;
}

/* Syntax Highlighted Output */
.highlighted-output-box, .unified-diff-box, .code-box {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.1rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  color: #e2e8f0;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 360px;
  overflow-y: auto;
  line-height: 1.7;
}

/* Syntax Highlighting Tokens */
.syntax-heading {
  display: block;
  font-weight: 700;
  color: #c084fc;
  margin-top: 0.8rem;
  margin-bottom: 0.3rem;
  font-size: 0.95rem;
  border-bottom: 1px solid rgba(192, 132, 252, 0.25);
  padding-bottom: 0.15rem;
}

.syntax-heading:first-child {
  margin-top: 0;
}

.syntax-bullet {
  color: var(--accent-blue);
  font-weight: 600;
}

.syntax-directive {
  color: #fbbf24;
  font-weight: 700;
  background: rgba(245, 158, 11, 0.12);
  padding: 0.1rem 0.3rem;
  border-radius: 3px;
}

.syntax-variable {
  color: #38bdf8;
  font-weight: 600;
}

.syntax-codeblock {
  background-color: #040711;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 0.6rem 0.8rem;
  margin: 0.5rem 0;
  color: #34d399;
}

/* Unified Diff Line Colors */
.unified-line {
  display: block;
  padding: 0.1rem 0.4rem;
  border-radius: 2px;
}

.unified-line.add {
  background-color: var(--diff-add-bg);
  color: var(--diff-add-text);
}

.unified-line.del {
  background-color: var(--diff-del-bg);
  color: var(--diff-del-text);
  text-decoration: line-through;
}

.unified-line.header {
  color: var(--text-muted);
  font-style: italic;
}

/* Rationale Box */
.rationale-box {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.08), rgba(168, 85, 247, 0.08));
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1.1rem;
  margin-top: 0.85rem;
}

.rationale-header {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 0.3rem;
  font-size: 0.82rem;
}

.rationale-strategy-tag {
  background-color: rgba(168, 85, 247, 0.2);
  color: #d8b4fe;
  border: 1px solid rgba(168, 85, 247, 0.4);
  padding: 0.1rem 0.45rem;
  border-radius: 4px;
  font-size: 0.7rem;
  font-family: 'JetBrains Mono', monospace;
  text-transform: uppercase;
}

.rationale-text {
  font-size: 0.82rem;
  color: #cbd5e1;
  line-height: 1.5;
}

/* ==========================================================================
   Tabs Container
   ========================================================================== */
.tabs-container {
  margin-top: 1.25rem;
}

.tabs-header {
  display: flex;
  border-bottom: 1px solid var(--border-color);
  gap: 0.5rem;
  margin-bottom: 1rem;
  overflow-x: auto;
}

.tab-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.55rem 0.9rem;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  white-space: nowrap;
  transition: all 0.2s ease;
}

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

.tab-btn.active {
  color: var(--accent-blue);
  border-bottom-color: var(--accent-blue);
}

.tab-pane {
  display: none;
}

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

.tab-description {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 0.85rem;
}

/* Candidates Table */
.candidates-table-wrapper {
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}

.data-table th, .data-table td {
  padding: 0.65rem 0.85rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.data-table th {
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.data-table tbody tr {
  transition: background-color 0.15s;
}

.data-table tbody tr:hover {
  background-color: var(--bg-tertiary);
}

/* Candidate Deep Dive Drawer */
.candidate-detail-card {
  margin-top: 1rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.1rem;
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

.candidate-detail-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
}

.candidate-detail-header h4 {
  font-size: 0.95rem;
  color: var(--accent-blue);
}

.btn-close-detail {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.2rem;
  cursor: pointer;
  line-height: 1;
}

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

.scores-radar-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.85rem;
  margin-bottom: 1rem;
}

.score-bar-group {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.score-bar-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.score-bar-label strong {
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-primary);
}

.score-progress-bar {
  width: 100%;
  height: 6px;
  background-color: var(--bg-tertiary);
  border-radius: 999px;
  overflow: hidden;
}

.score-fill {
  height: 100%;
  background: linear-gradient(90deg, #0284c7, #10b981);
  border-radius: 999px;
  transition: width 0.6s ease;
}

.detail-feedback-box {
  background-color: var(--bg-tertiary);
  border-left: 3px solid var(--accent-blue);
  padding: 0.65rem 0.85rem;
  font-size: 0.78rem;
  color: #cbd5e1;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 1rem;
}

.detail-test-executions h5 {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.test-run-item {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.65rem 0.85rem;
  margin-bottom: 0.5rem;
  font-size: 0.78rem;
}

.test-run-meta {
  display: flex;
  justify-content: space-between;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

.test-run-output {
  background-color: var(--bg-primary);
  padding: 0.5rem 0.7rem;
  border-radius: 4px;
  font-family: 'JetBrains Mono', monospace;
  color: #cbd5e1;
  white-space: pre-wrap;
  word-break: break-word;
}

/* Bullet Lists (Invariants & Redundancies) */
.bullet-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.bullet-list li {
  font-size: 0.82rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  padding: 0.7rem 1rem;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  line-height: 1.5;
}

.bullet-list li strong {
  color: var(--text-primary);
}

/* JSON Viewer */
.audit-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.audit-title {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
}

.json-box {
  max-height: 420px;
}

.json-key { color: #38bdf8; }
.json-string { color: #34d399; }
.json-number { color: #f59e0b; }
.json-boolean { color: #a855f7; }
.json-null { color: #94a3b8; }

/* ==========================================================================
   Placeholder State
   ========================================================================== */
.placeholder-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 380px;
  text-align: center;
  color: var(--text-secondary);
  padding: 2rem;
}

.placeholder-graphic {
  position: relative;
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}

.graphic-circle {
  position: absolute;
  border-radius: 50%;
  border: 1px dashed var(--border-color);
}

.outer-circle {
  width: 80px;
  height: 80px;
  animation: rotateClockwise 20s linear infinite;
  border-color: rgba(56, 189, 248, 0.25);
}

.inner-circle {
  width: 56px;
  height: 56px;
  animation: rotateCounter 14s linear infinite;
  border-color: rgba(168, 85, 247, 0.25);
}

@keyframes rotateClockwise {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes rotateCounter {
  from { transform: rotate(0deg); }
  to { transform: rotate(-360deg); }
}

.graphic-icon {
  font-size: 2.2rem;
  z-index: 1;
}

.placeholder-state h3 {
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  font-size: 1.15rem;
}

.placeholder-state p {
  max-width: 440px;
  font-size: 0.85rem;
  line-height: 1.6;
}

.placeholder-tags {
  display: flex;
  gap: 0.5rem;
  margin-top: 1.25rem;
}

/* ==========================================================================
   Modal
   ========================================================================== */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
  animation: fadeIn 0.2s ease;
}

.modal-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  max-width: 580px;
  width: 90%;
  box-shadow: var(--shadow-lg);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.modal-title-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.modal-icon {
  font-size: 1.2rem;
}

.btn-close-modal {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.4rem;
  cursor: pointer;
  line-height: 1;
}

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

.modal-subtitle {
  color: var(--text-secondary);
  font-size: 0.82rem;
  margin-bottom: 1.2rem;
}

.clarification-list {
  max-height: 320px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.clarification-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.85rem;
}

.clarification-card label {
  font-size: 0.85rem;
  font-weight: 600;
  display: block;
  margin-bottom: 0.3rem;
  color: var(--text-primary);
}

.clarification-meta {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.85rem;
  margin-top: 1.5rem;
}

/* ==========================================================================
   Toast Notification System
   ========================================================================== */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  z-index: 1000;
}

.toast {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--accent-blue);
  color: var(--text-primary);
  padding: 0.75rem 1.1rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  animation: slideToastIn 0.3s ease forwards;
  max-width: 360px;
}

.toast.toast-success {
  border-left-color: var(--accent-green);
}

.toast.toast-error {
  border-left-color: var(--accent-red);
}

@keyframes slideToastIn {
  from { transform: translateX(50px); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

@keyframes slideToastOut {
  from { transform: translateX(0); opacity: 1; }
  to { transform: translateX(50px); opacity: 0; }
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 1200px) {
  .main-layout {
    grid-template-columns: 1fr;
  }
  
  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 768px) {
  .navbar {
    padding: 0.85rem 1rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.85rem;
  }

  .navbar-right {
    width: 100%;
    justify-content: space-between;
  }

  .main-layout {
    padding: 1rem;
    gap: 1rem;
  }

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

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

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

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

  .roi-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .action-bar {
    flex-direction: column;
  }

  .toast-container {
    bottom: 1rem;
    right: 1rem;
    left: 1rem;
  }

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