:root {
  --bg: #0f1114;
  --surface: #1a1d22;
  --surface-2: #22262d;
  --border: #2e333b;
  --text: #e8eaed;
  --text-dim: #8b919a;
  --accent: #4fc3f7;
  --accent2: #81d4fa;
  --success: #66bb6a;
  --error: #ef5350;
  --warning: #ffca28;
  --thread-swatch: 20px;
}

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

body {
  font-family: 'Inter', 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* Header */
.header {
  display: flex;
  align-items: center;
  padding: 12px 24px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  gap: 16px;
}

.header-logo {
  height: 36px;
  filter: brightness(0) invert(1);
}

.header-divider {
  width: 1px;
  height: 28px;
  background: var(--border);
}

.header h1 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
}

.header-subtitle {
  font-size: 12px;
  color: var(--text-dim);
  margin-left: auto;
}

/* Breadcrumb Nav */
.breadcrumb-nav {
  padding: 8px 24px;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb-nav a {
  color: var(--accent);
  text-decoration: none;
}

.breadcrumb-nav a:hover {
  text-decoration: underline;
}

.breadcrumb-sep {
  color: var(--text-dim);
}

.breadcrumb-current {
  color: var(--text-dim);
}

/* Upload Section */
.upload-section {
  padding: 24px;
  max-width: 1400px;
  margin: 0 auto;
}

.upload-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
  margin-bottom: 20px;
}

.upload-zone {
  border: 2px dashed var(--border);
  border-radius: 12px;
  padding: 32px 20px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  background: var(--surface);
}

.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--accent);
  background: rgba(79, 195, 247, 0.05);
}

.upload-zone.has-file {
  border-color: var(--success);
  border-style: solid;
  background: rgba(102, 187, 106, 0.05);
}

.upload-zone .icon {
  font-size: 32px;
  color: var(--text-dim);
  margin-bottom: 8px;
}

.upload-zone.has-file .icon {
  color: var(--success);
}

.upload-zone h3 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 4px;
}

.upload-zone p {
  font-size: 12px;
  color: var(--text-dim);
}

.upload-zone .file-name {
  font-size: 12px;
  color: var(--success);
  margin-top: 8px;
  word-break: break-all;
}

.upload-zone .ext-badge {
  display: inline-block;
  background: var(--surface-2);
  padding: 2px 10px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 700;
  color: var(--accent);
  margin-top: 8px;
  font-family: monospace;
}

/* Action bar */
.action-bar {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-bottom: 20px;
}

.btn {
  padding: 10px 24px;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-primary {
  background: var(--accent);
  color: #000;
}

.btn-primary:hover {
  background: var(--accent2);
}

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

.btn-secondary {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
}

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

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

.color-source-toggle {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-dim);
}

.color-source-toggle select {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 13px;
}

/* Results Section */
.results-section {
  display: none;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px 24px;
}

.results-section.visible {
  display: block;
}

.results-grid {
  display: grid;
  grid-template-columns: 1fr 500px;
  gap: 20px;
}

/* Mockup Preview */
.mockup-panel {
  background: var(--surface);
  border-radius: 12px;
  border: 1px solid var(--border);
  overflow: hidden;
}

.mockup-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}

.mockup-header h2 {
  font-size: 14px;
  font-weight: 600;
}

.mockup-actions {
  display: flex;
  gap: 8px;
}

.mockup-actions .btn {
  padding: 6px 14px;
  font-size: 12px;
}

.mockup-image-container {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  min-height: 400px;
  background: #000;
}

.mockup-image-container img {
  max-width: 100%;
  max-height: 70vh;
  object-fit: contain;
}

.mockup-stats {
  display: flex;
  gap: 24px;
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-dim);
}

.mockup-stats .stat-value {
  color: var(--text);
  font-weight: 600;
}

/* Thread Panel */
.thread-panel {
  background: var(--surface);
  border-radius: 12px;
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - 180px);
}

.thread-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.thread-header h2 {
  font-size: 14px;
  font-weight: 600;
}

.thread-count {
  font-size: 12px;
  color: var(--text-dim);
  background: var(--surface-2);
  padding: 2px 10px;
  border-radius: 10px;
}

.thread-list {
  overflow-y: auto;
  flex: 1;
}

.thread-col-headers {
  display: grid;
  grid-template-columns: 32px var(--thread-swatch) 1fr 1fr 60px;
  gap: 10px;
  padding: 6px 16px;
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-dim);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.thread-row {
  display: grid;
  grid-template-columns: 32px var(--thread-swatch) 1fr 1fr 60px;
  gap: 10px;
  align-items: center;
  padding: 8px 16px;
  border-bottom: 1px solid rgba(46, 51, 59, 0.5);
  font-size: 13px;
}

.thread-row:hover {
  background: var(--surface-2);
}

.thread-run {
  color: var(--text-dim);
  font-size: 11px;
  text-align: center;
}

.thread-swatch {
  width: var(--thread-swatch);
  height: var(--thread-swatch);
  border-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.thread-name {
  font-weight: 500;
}

.thread-element {
  font-size: 11px;
  color: var(--accent);
  font-weight: 400;
  font-style: italic;
  animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.thread-catalog {
  color: var(--text-dim);
  font-size: 11px;
  font-family: monospace;
  text-align: right;
}

/* Comparison Panel */
.comparison-panel {
  display: none;
  background: var(--surface);
  border-radius: 12px;
  border: 1px solid var(--border);
  margin-top: 20px;
  max-width: 1400px;
  margin-left: auto;
  margin-right: auto;
  padding: 0 0 0 0;
}

.comparison-panel.visible {
  display: block;
  margin: 20px auto;
  padding: 0;
  max-width: 1400px;
}

.comparison-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}

.comparison-header h2 {
  font-size: 14px;
  font-weight: 600;
}

.match-badge {
  font-size: 12px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 10px;
}

.match-badge.match {
  background: rgba(102, 187, 106, 0.15);
  color: var(--success);
}

.match-badge.mismatch {
  background: rgba(239, 83, 80, 0.15);
  color: var(--error);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
}

.comparison-table th {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-dim);
  padding: 10px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.comparison-table td {
  padding: 8px 16px;
  font-size: 13px;
  border-bottom: 1px solid rgba(46, 51, 59, 0.3);
}

.comparison-table tr.mismatch-row td {
  background: rgba(239, 83, 80, 0.05);
}

.match-icon {
  font-size: 14px;
}

.match-icon.yes {
  color: var(--success);
}

.match-icon.no {
  color: var(--error);
}

/* Design Info */
.design-info {
  display: flex;
  gap: 24px;
  padding: 12px 16px;
  background: var(--surface);
  border-radius: 12px;
  border: 1px solid var(--border);
  margin-bottom: 20px;
  font-size: 13px;
}

.design-info .info-item {
  display: flex;
  gap: 6px;
}

.design-info .info-label {
  color: var(--text-dim);
}

.design-info .info-value {
  font-weight: 600;
}

/* Loading Spinner */
.spinner-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 16px;
}

.spinner-overlay.visible {
  display: flex;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.spinner-text {
  font-size: 14px;
  color: var(--text-dim);
}

/* Error Banner */
.error-banner {
  display: none;
  padding: 12px 16px;
  background: rgba(239, 83, 80, 0.1);
  border: 1px solid var(--error);
  border-radius: 8px;
  color: var(--error);
  font-size: 13px;
  margin: 0 24px 16px;
  max-width: 1400px;
}

.error-banner.visible {
  display: block;
}

.error-banner.success {
  background: rgba(76, 175, 80, 0.1);
  border-color: #4caf50;
  color: #4caf50;
}

/* Interactive thread color-swap */
.thread-row.clickable {
  cursor: pointer;
}

.thread-row.clickable:hover {
  background: rgba(79, 195, 247, 0.08);
}

.thread-row.modified {
  border-left: 3px solid var(--warning);
}

.thread-edit {
  color: var(--text-dim);
  font-size: 11px;
  opacity: 0;
  transition: opacity 0.15s;
  margin-left: auto;
}

.thread-row.clickable:hover .thread-edit {
  opacity: 1;
}

.mockup-image-container.pending {
  opacity: 0.5;
  transition: opacity 0.2s;
}

.btn-sm {
  padding: 4px 10px;
  font-size: 11px;
}

/* Responsive */
@media (max-width: 1024px) {
  .results-grid {
    grid-template-columns: 1fr;
  }
  .upload-grid {
    grid-template-columns: 1fr;
  }
}