:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --bg-card: #1e293b;
  --border-color: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-color: #38bdf8;
  --accent-hover: #0284c7;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --badge-bg: #0369a1;
  --table-hover: #1e293b80;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.top-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.5rem;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  gap: 1.5rem;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 220px;
}

.logo-icon {
  font-size: 1.75rem;
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-title {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--accent-color);
}

.logo-subtitle {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.nav-search-container {
  display: flex;
  flex: 1;
  max-width: 700px;
  gap: 0.5rem;
}

.search-input-wrapper {
  position: relative;
  flex: 1;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 0.75rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.search-input-wrapper input {
  width: 100%;
  padding: 0.6rem 2.2rem 0.6rem 2.2rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: var(--font-mono);
  outline: none;
  transition: border-color 0.2s;
}

.search-input-wrapper input:focus {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.2);
}

.clear-btn {
  position: absolute;
  right: 0.75rem;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1.1rem;
}

/* Buttons */
.btn {
  padding: 0.6rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
  border: none;
  transition: background 0.2s, transform 0.1s;
}

.btn-primary {
  background-color: var(--accent-color);
  color: #03213a;
}

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

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

.btn-secondary:hover {
  background-color: #475569;
}

/* Quick Samples */
.quick-samples {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1.5rem;
  background-color: #131c2e;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.8rem;
  overflow-x: auto;
}

.quick-label {
  color: var(--text-muted);
  font-weight: 500;
}

.sample-tag {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--accent-color);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.75rem;
  transition: all 0.2s;
}

.sample-tag:hover {
  background: var(--bg-tertiary);
  border-color: var(--accent-color);
}

/* Main Container */
.main-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 1rem 1.5rem;
  gap: 1rem;
}

/* Vehicle Banner */
.vehicle-banner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.2);
}

.vehicle-title-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.vehicle-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.6rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 4px;
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.badge-accent {
  background: #0284c7;
  color: #fff;
}

.badge-outline {
  background: transparent;
  border: 1px solid var(--accent-color);
  color: var(--accent-color);
}

.badge-primary {
  background: #0369a1;
  color: #fff;
}

.vehicle-meta-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  font-size: 0.85rem;
}

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

.meta-label {
  color: var(--text-muted);
}

.meta-value {
  color: var(--text-secondary);
  font-weight: 500;
}

.font-mono {
  font-family: var(--font-mono);
}

.icon-btn-small {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 0.85rem;
  opacity: 0.7;
}

.icon-btn-small:hover {
  opacity: 1;
}

.vehicle-stats {
  display: flex;
  gap: 1rem;
}

.stat-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 0.5rem 1rem;
  text-align: center;
  min-width: 90px;
}

.stat-num {
  display: block;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent-color);
}

.stat-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

/* Catalog Explorer 3-column layout */
.catalog-explorer {
  display: grid;
  grid-template-columns: 260px 1fr 420px;
  gap: 1rem;
  flex: 1;
  min-height: 650px;
}

/* Sidebar Categories */
.sidebar-categories {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
}

.sidebar-header h3 {
  font-size: 0.95rem;
  font-weight: 600;
}

.category-search {
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.category-search input {
  width: 100%;
  padding: 0.4rem 0.6rem;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-primary);
  font-size: 0.8rem;
  outline: none;
}

.category-list {
  flex: 1;
  overflow-y: auto;
  list-style: none;
  padding: 0.25rem 0;
}

.category-item {
  padding: 0.6rem 1rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-left: 3px solid transparent;
  transition: all 0.15s;
}

.category-item:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.category-item.active {
  background: #0369a133;
  color: var(--accent-color);
  border-left-color: var(--accent-color);
  font-weight: 600;
}

/* Viewer Section */
.viewer-section {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.viewer-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
}

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

.diagram-heading {
  font-size: 1rem;
  font-weight: 600;
}

.viewer-controls {
  display: flex;
  gap: 0.35rem;
}

.btn-tool {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 0.35rem 0.6rem;
  color: var(--text-primary);
  font-size: 0.85rem;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-tool:hover {
  background: #475569;
}

.diagram-canvas-container {
  flex: 1;
  background: #090d16;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 400px;
  cursor: grab;
}

.diagram-canvas-container:active {
  cursor: grabbing;
}

.diagram-placeholder {
  text-align: center;
  color: var(--text-muted);
  max-width: 320px;
}

.placeholder-icon {
  font-size: 3rem;
  margin-bottom: 0.5rem;
}

.diagram-image {
  max-width: 90%;
  max-height: 90%;
  object-fit: contain;
  transition: transform 0.1s ease-out;
  user-select: none;
}

/* Carousel */
.diagrams-carousel-container {
  padding: 0.6rem 1rem;
  background: var(--bg-primary);
  border-top: 1px solid var(--border-color);
}

.carousel-header h4 {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 0.4rem;
}

.diagrams-thumbnails {
  display: flex;
  gap: 0.6rem;
  overflow-x: auto;
  padding-bottom: 0.2rem;
}

.diagram-thumb-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 0.4rem 0.6rem;
  min-width: 140px;
  cursor: pointer;
  font-size: 0.75rem;
  transition: all 0.15s;
}

.diagram-thumb-card:hover {
  border-color: var(--accent-color);
}

.diagram-thumb-card.active {
  border-color: var(--accent-color);
  background: #0369a133;
}

.thumb-code {
  font-weight: 600;
  color: var(--accent-color);
  font-family: var(--font-mono);
}

.thumb-title {
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Parts Table Sidebar */
.sidebar-parts {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

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

.parts-title-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.parts-title-row h3 {
  font-size: 0.95rem;
  font-weight: 600;
}

.parts-search-bar input {
  width: 100%;
  padding: 0.4rem 0.6rem;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-primary);
  font-size: 0.8rem;
  outline: none;
}

.parts-table-wrapper {
  flex: 1;
  overflow-y: auto;
}

.parts-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
  text-align: left;
}

.parts-table th {
  background: var(--bg-tertiary);
  padding: 0.5rem 0.75rem;
  color: var(--text-secondary);
  font-weight: 600;
  position: sticky;
  top: 0;
  z-index: 10;
}

.parts-table td {
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--border-color);
  vertical-align: middle;
}

.parts-table tr:hover {
  background-color: var(--table-hover);
}

.callout-badge {
  display: inline-block;
  background: #334155;
  color: #38bdf8;
  font-family: var(--font-mono);
  font-weight: 700;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.75rem;
}

.part-num-cell {
  font-family: var(--font-mono);
  font-weight: 600;
  color: #fff;
  cursor: pointer;
}

.part-num-cell:hover {
  color: var(--accent-color);
}

.parts-empty {
  padding: 2rem;
  text-align: center;
  color: var(--text-muted);
}

/* Welcome Hero */
.welcome-hero {
  display: flex;
  justify-content: center;
  align-items: center;
  flex: 1;
  padding: 2rem;
}

.hero-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 3rem;
  max-width: 680px;
  text-align: center;
}

.hero-icon {
  font-size: 3.5rem;
  margin-bottom: 1rem;
}

.hero-card h2 {
  font-size: 1.8rem;
  margin-bottom: 0.75rem;
}

.hero-card p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.hero-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  text-align: left;
}

.feature-item {
  display: flex;
  gap: 0.75rem;
}

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

.feature-item strong {
  display: block;
  font-size: 0.9rem;
  margin-bottom: 0.2rem;
}

.feature-item p {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0;
}

/* Modals & Drawers */
.modal-overlay, .drawer-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 2.5rem;
  width: 90%;
  max-width: 480px;
  text-align: center;
}

.modal-spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--border-color);
  border-top-color: var(--accent-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 1.5rem;
}

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

.progress-bar-bg {
  height: 8px;
  background: var(--bg-primary);
  border-radius: 4px;
  overflow: hidden;
  margin: 1.25rem 0;
}

.progress-bar-fill {
  height: 100%;
  background: var(--accent-color);
  transition: width 0.3s ease;
}

.modal-subtext {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.drawer-content {
  position: fixed;
  right: 0;
  top: 0;
  bottom: 0;
  width: 400px;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
}

.drawer-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
}

.close-drawer-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
}

.recent-vins-list {
  flex: 1;
  overflow-y: auto;
  padding: 0.5rem;
}

.recent-vin-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 0.75rem;
  margin-bottom: 0.5rem;
  cursor: pointer;
  transition: border-color 0.15s;
}

.recent-vin-card:hover {
  border-color: var(--accent-color);
}