:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --border-color: #475569;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-cyan: #06b6d4;
  --accent-blue: #3b82f6;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  --accent-purple: #a855f7;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
  --font-sans:
    -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.5;
  padding: 1rem;
}

.app-layout {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.app-header {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.75rem;
}

.app-header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.app-subtitle {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-top: 0.25rem;
}

.main-container {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 1rem;
  align-items: start;
}

.sidebar-col {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  position: sticky;
  top: 1rem;
}

.workspace-col {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.panel {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  padding: 1rem;
}

.panel h2,
.panel h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin-bottom: 0.75rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

label {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

input[type='text'],
input[type='number'],
textarea,
select {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 0.375rem;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 0.35rem 0.5rem;
  width: 100%;
}

input:focus,
textarea:focus,
select:focus {
  outline: 2px solid var(--accent-cyan);
  border-color: transparent;
}

.button-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.btn {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 0.375rem;
  color: var(--text-primary);
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.35rem 0.65rem;
  transition: all 0.15s ease;
}

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

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-primary {
  background-color: var(--accent-blue);
  border-color: var(--accent-blue);
}

.btn-primary:hover:not(:disabled) {
  background-color: #2563eb;
}

.btn-secondary {
  background-color: var(--accent-purple);
  border-color: var(--accent-purple);
}

.btn-accent {
  background-color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  color: #0f172a;
  font-weight: 600;
}

.btn-outline {
  background-color: transparent;
}

.custom-editor-box {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.alert-error {
  background-color: rgba(244, 63, 94, 0.15);
  border: 1px solid var(--accent-rose);
  border-radius: 0.375rem;
  padding: 0.5rem;
  color: #fecdd3;
  font-size: 0.8rem;
  margin-bottom: 0.75rem;
}

.status-banner {
  background-color: rgba(6, 182, 212, 0.1);
  border-left: 4px solid var(--accent-cyan);
  padding: 0.5rem 0.75rem;
  border-radius: 0 0.375rem 0.375rem 0;
  font-size: 0.875rem;
  color: var(--text-primary);
}

.playback-container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  padding: 0.5rem 0.75rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
}

.playback-controls {
  display: flex;
  gap: 0.5rem;
}

.btn-icon {
  font-size: 0.9rem;
  padding: 0.3rem 0.6rem;
}

.btn-play {
  min-width: 80px;
}

.scrubber-container {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 220px;
}

input[type='range'] {
  flex: 1;
  cursor: pointer;
  accent-color: var(--accent-cyan);
}

.step-indicator {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  white-space: nowrap;
}

.speed-container {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.speed-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Pool Workspace */
.pool-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  min-height: 50px;
  margin-top: 0.5rem;
}

.fragment-card {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 0.375rem;
  padding: 0.35rem 0.6rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.25s ease;
}

.card-prefix {
  border-color: var(--accent-cyan);
  background-color: rgba(6, 182, 212, 0.15);
  box-shadow: 0 0 10px rgba(6, 182, 212, 0.3);
}

.card-suffix {
  border-color: var(--accent-purple);
  background-color: rgba(168, 85, 247, 0.15);
  box-shadow: 0 0 10px rgba(168, 85, 247, 0.3);
}

.card-merged {
  border-color: var(--accent-emerald);
  background-color: rgba(16, 185, 129, 0.15);
  box-shadow: 0 0 10px rgba(16, 185, 129, 0.4);
}

.card-removed {
  opacity: 0.5;
  text-decoration: line-through;
  border-color: var(--accent-rose);
  background-color: rgba(244, 63, 94, 0.1);
}

.badge {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 0.1rem 0.35rem;
  border-radius: 0.25rem;
}

.badge-prefix {
  background-color: var(--accent-cyan);
  color: #0f172a;
}

.badge-suffix {
  background-color: var(--accent-purple);
  color: #fff;
}

.badge-merged {
  background-color: var(--accent-emerald);
  color: #0f172a;
}

.badge-contained {
  background-color: var(--accent-rose);
  color: #fff;
}

.badge-duplicate {
  background-color: var(--accent-amber);
  color: #0f172a;
}

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

.fragment-length {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.removed-section {
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--border-color);
}

/* Merge Theatre */
.theatre-content {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 0.5rem;
  background-color: var(--bg-primary);
  border: 1px dashed var(--border-color);
  border-radius: 0.375rem;
}

.theatre-idle {
  color: var(--text-muted);
  font-style: italic;
  padding: 1rem;
  text-align: center;
}

.theatre-row {
  display: flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.row-label {
  width: 70px;
  font-size: 0.65rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.cell-row {
  display: inline-flex;
}

.char-cell {
  width: 20px;
  height: 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  border-radius: 0.2rem;
  margin-right: 2px;
}

.char-overlap {
  background-color: rgba(16, 185, 129, 0.3);
  border-color: var(--accent-emerald);
  color: #6ee7b7;
  font-weight: 700;
}

.char-prefix {
  color: var(--accent-cyan);
}

.char-suffix {
  color: var(--accent-purple);
}

.char-gap,
.char-placeholder {
  border-style: dashed;
  color: var(--text-muted);
  background-color: rgba(100, 116, 139, 0.1);
}

/* Reference Diff & Diagnostics */
.diff-placeholder {
  color: var(--text-muted);
  font-style: italic;
  padding: 1rem;
  text-align: center;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.metric-card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 0.375rem;
  padding: 0.6rem 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.metric-label {
  font-size: 0.65rem;
  text-transform: uppercase;
  color: var(--text-secondary);
  font-weight: 600;
  letter-spacing: 0.05em;
}

.metric-value {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
}

.metric-desc {
  font-size: 0.75rem;
  color: var(--text-secondary);
  line-height: 1.3;
  margin-top: 0.15rem;
}

.metric-card.status-perfect {
  border-color: var(--accent-emerald);
  background-color: rgba(16, 185, 129, 0.08);
}

.metric-card.status-perfect .metric-value {
  color: #6ee7b7;
}

.metric-card.status-partial {
  border-color: var(--accent-amber);
  background-color: rgba(245, 158, 11, 0.08);
}

.metric-card.status-partial .metric-value {
  color: #fde68a;
}

.metric-card.status-fragmented {
  border-color: var(--accent-blue);
  background-color: rgba(59, 130, 246, 0.08);
}

.metric-card.status-fragmented .metric-value {
  color: #93c5fd;
}

.metric-card.status-misassembly {
  border-color: var(--accent-rose);
  background-color: rgba(244, 63, 94, 0.08);
}

.metric-card.status-misassembly .metric-value {
  color: #fda4af;
}

.metric-card.status-in-progress {
  border-color: var(--accent-cyan);
  background-color: rgba(6, 182, 212, 0.08);
}

.metric-card.status-in-progress .metric-value {
  color: #67e8f9;
}

.alignment-theatre {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
}

.diff-row {
  display: flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.diff-row-label {
  width: 90px;
  font-size: 0.65rem;
  color: var(--text-secondary);
  text-transform: uppercase;
}

.diff-cells {
  display: inline-flex;
}

.diff-cell {
  width: 20px;
  height: 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  border-radius: 0.2rem;
  margin-right: 2px;
}

.diff-char-covered,
.diff-char-match {
  background-color: rgba(16, 185, 129, 0.25);
  border-color: var(--accent-emerald);
  color: #6ee7b7;
}

.diff-char-uncovered {
  background-color: rgba(100, 116, 139, 0.15);
  border-style: dashed;
  color: var(--text-muted);
}

.diff-char-mismatch {
  background-color: rgba(244, 63, 94, 0.25);
  border-color: var(--accent-rose);
  color: #fda4af;
}

.diff-cell-gap {
  border-style: dashed;
  color: var(--text-muted);
  background-color: rgba(100, 116, 139, 0.05);
}

.diff-row-empty {
  font-style: italic;
  color: var(--text-muted);
}

.diff-empty-note {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.diff-legend {
  display: flex;
  gap: 1rem;
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-color);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.legend-swatch {
  width: 14px;
  height: 14px;
  border-radius: 2px;
}

.swatch-match {
  background-color: rgba(16, 185, 129, 0.5);
  border: 1px solid var(--accent-emerald);
}

.swatch-mismatch {
  background-color: rgba(244, 63, 94, 0.5);
  border: 1px solid var(--accent-rose);
}

.swatch-uncovered {
  background-color: rgba(100, 116, 139, 0.2);
  border: 1px dashed var(--border-color);
}

@media (max-width: 900px) {
  .main-container {
    grid-template-columns: 1fr;
  }
  .sidebar-col {
    position: static;
  }
}