:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #1c2333;
  --bg-hover: #242d3d;
  --border: #30363d;
  --border-light: #3d4450;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --accent: #e63946;
  --accent-glow: rgba(230, 57, 70, 0.15);
  --accent-warm: #ff9f1c;
  --accent-cool: #4ecdc4;
  --success: #3fb950;
  --warning: #d29922;
  --danger: #f85149;
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --sidebar-width: 240px;
  --chat-width: 380px;
  --radius: 8px;
  --radius-lg: 12px;
}

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

html { font-size: 15px; }

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  display: flex;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 100;
  transition: transform 0.25s ease;
}

.sidebar-header {
  padding: 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sidebar-close {
  display: none;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.5rem;
  cursor: pointer;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-icon {
  font-size: 1.5rem;
  color: var(--accent);
}

.logo-text {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: 2px;
  color: var(--text-primary);
}

.nav-links {
  list-style: none;
  padding: 12px 0;
  flex: 1;
  overflow-y: auto;
}

.nav-links li {
  padding: 10px 20px;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: all 0.15s ease;
  border-left: 3px solid transparent;
}

.nav-links li:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.nav-links li.active {
  color: var(--accent);
  background: var(--accent-glow);
  border-left-color: var(--accent);
}

.nav-icon { font-size: 1.1rem; width: 24px; text-align: center; }

.sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--border);
}

.safety-reminder {
  font-size: 0.75rem;
  color: var(--accent-warm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Main Content */
.content {
  flex: 1;
  margin-left: var(--sidebar-width);
  min-height: 100vh;
  transition: margin-right 0.25s ease;
}

.top-bar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 14px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.4rem;
  cursor: pointer;
}

.page-title {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.chat-toggle {
  background: var(--accent);
  color: white;
  border: none;
  padding: 8px 16px;
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: background 0.15s;
}

.chat-toggle:hover { background: #c1303e; }

.chat-icon { font-size: 1rem; }

/* Pages */
.page {
  display: none;
  padding: 28px;
  max-width: 960px;
  animation: fadeIn 0.2s ease;
}

.page.active { display: block; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Hero */
.hero {
  padding: 40px 0 32px;
}

.hero h2 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 12px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 640px;
}

/* Section Intro */
.section-intro {
  padding: 24px 0 20px;
}

.section-intro h2 {
  font-size: 1.6rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.section-intro p {
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 640px;
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin-bottom: 28px;
}

.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.card:hover {
  border-color: var(--border-light);
  background: var(--bg-tertiary);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

.card-accent {
  border-color: var(--accent);
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--accent-glow) 100%);
}

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

.card-icon {
  font-size: 1.8rem;
  margin-bottom: 12px;
}

.card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Info Box */
.info-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 24px;
}

.info-box h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--accent-warm);
}

.info-box p {
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 12px;
}

.info-box p:last-child { margin-bottom: 0; }

/* Budget Breakdown */
.budget-breakdown {
  margin-top: 16px;
}

.budget-breakdown h4 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.budget-row {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}

.budget-row span:first-child { color: var(--text-secondary); }

.budget-amount {
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--text-primary);
}

.budget-row.total {
  border-bottom: none;
  border-top: 2px solid var(--accent);
  margin-top: 4px;
  padding-top: 12px;
  font-weight: 700;
}

.budget-row.total span:first-child { color: var(--text-primary); }
.budget-row.total .budget-amount { color: var(--accent-warm); font-size: 1rem; }

/* Safety Box */
.safety-box {
  background: linear-gradient(135deg, var(--bg-secondary) 0%, rgba(248, 81, 73, 0.05) 100%);
  border: 1px solid var(--danger);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 24px;
}

.safety-box h3 {
  color: var(--danger);
  font-size: 1.05rem;
  margin-bottom: 12px;
}

.safety-box ul {
  list-style: none;
}

.safety-box li {
  padding: 6px 0;
  padding-left: 20px;
  position: relative;
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.5;
}

.safety-box li::before {
  content: '!';
  position: absolute;
  left: 0;
  color: var(--danger);
  font-weight: 700;
}

/* Two Column Layout */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 28px;
}

/* Flag Lists */
.flag-list {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: 24px;
  border: 1px solid var(--border);
}

.flag-list h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.green-flags h3 { color: var(--success); }
.red-flags h3 { color: var(--danger); }

.flag-list ul { list-style: none; }

.flag-list li {
  padding: 6px 0;
  padding-left: 20px;
  position: relative;
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.5;
}

.green-flags li::before {
  content: '+';
  position: absolute;
  left: 0;
  color: var(--success);
  font-weight: 700;
}

.red-flags li::before {
  content: '–';
  position: absolute;
  left: 0;
  color: var(--danger);
  font-weight: 700;
  font-size: 1.1rem;
}

/* Inspection Checklist */
.checklist-container {
  margin-bottom: 28px;
}

.checklist-category {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-bottom: 12px;
  overflow: hidden;
}

.checklist-header {
  padding: 16px 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
  transition: background 0.15s;
}

.checklist-header:hover { background: var(--bg-tertiary); }

.checklist-arrow {
  color: var(--text-muted);
  transition: transform 0.2s;
  font-size: 0.8rem;
}

.checklist-category.open .checklist-arrow { transform: rotate(90deg); }

.checklist-items {
  display: none;
  padding: 0 20px 16px;
}

.checklist-category.open .checklist-items { display: block; }

.checklist-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 6px 0;
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.5;
}

.checklist-item input[type="checkbox"] {
  margin-top: 3px;
  accent-color: var(--accent-cool);
  flex-shrink: 0;
}

/* Source Cards */
.source-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 12px;
  margin-bottom: 28px;
}

.source-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
}

.source-card h4 {
  font-size: 0.95rem;
  margin-bottom: 4px;
}

.source-card .source-type {
  font-size: 0.75rem;
  color: var(--accent-cool);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}

.source-card p {
  font-size: 0.83rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.source-card .good-for {
  margin-top: 8px;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.source-tag {
  font-size: 0.7rem;
  background: var(--bg-tertiary);
  color: var(--text-muted);
  padding: 2px 8px;
  border-radius: 20px;
  border: 1px solid var(--border);
}

/* Generation Tabs */
.gen-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0;
}

.gen-tab {
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-secondary);
  padding: 10px 20px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}

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

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

/* Generation Detail */
.gen-detail {
  animation: fadeIn 0.2s ease;
}

.gen-header {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 16px;
}

.gen-header h3 {
  font-size: 1.3rem;
  font-weight: 800;
}

.gen-header .gen-years {
  font-family: var(--font-mono);
  color: var(--text-muted);
  font-size: 0.9rem;
}

.gen-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.gen-badge.recommended {
  background: var(--accent-glow);
  color: var(--accent);
  border: 1px solid var(--accent);
}

.gen-badge.possible {
  background: rgba(255, 159, 28, 0.1);
  color: var(--accent-warm);
  border: 1px solid rgba(255, 159, 28, 0.3);
}

.gen-badge.unlikely {
  background: rgba(139, 148, 158, 0.1);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

/* Engine Spec Table */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 20px;
  font-size: 0.85rem;
}

.spec-table th {
  text-align: left;
  padding: 10px 12px;
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.spec-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  color: var(--text-primary);
}

.spec-table tr:last-child td { border-bottom: none; }

.spec-table .mono {
  font-family: var(--font-mono);
  font-size: 0.83rem;
}

/* Issue Cards */
.issue-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 8px;
}

.issue-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}

.issue-header h4 { font-size: 0.9rem; }

.severity-badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.severity-critical { background: rgba(248, 81, 73, 0.15); color: var(--danger); }
.severity-high { background: rgba(210, 153, 34, 0.15); color: var(--warning); }
.severity-moderate { background: rgba(78, 205, 196, 0.15); color: var(--accent-cool); }

.issue-applies {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.issue-card p {
  font-size: 0.83rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 6px;
}

.issue-cost {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-warm);
}

/* Strengths list */
.strengths-list {
  list-style: none;
  margin-bottom: 20px;
}

.strengths-list li {
  padding: 4px 0 4px 20px;
  position: relative;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.strengths-list li::before {
  content: '+';
  position: absolute;
  left: 0;
  color: var(--success);
  font-weight: 700;
}

/* Systems Grid */
.systems-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}

.system-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: border-color 0.15s;
}

.system-card:hover { border-color: var(--border-light); }

.system-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--accent-cool);
}

.system-card p {
  font-size: 0.83rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 12px;
}

.subsystem-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 16px;
}

.subsystem-tag {
  font-size: 0.7rem;
  background: var(--bg-tertiary);
  color: var(--text-muted);
  padding: 3px 8px;
  border-radius: 4px;
}

.maintenance-list {
  list-style: none;
  border-top: 1px solid var(--border);
  padding-top: 12px;
}

.maintenance-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 0;
  font-size: 0.8rem;
  border-bottom: 1px solid rgba(48, 54, 61, 0.5);
}

.maintenance-item:last-child { border-bottom: none; }

.maintenance-item .item-name { color: var(--text-secondary); flex: 1; }
.maintenance-item .item-interval {
  font-family: var(--font-mono);
  color: var(--text-muted);
  font-size: 0.73rem;
  text-align: right;
  max-width: 180px;
}

.difficulty-dots {
  display: flex;
  gap: 3px;
  margin-left: 8px;
}

.difficulty-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--border);
}

.difficulty-dot.filled { background: var(--accent-warm); }

/* Repair Guides */
.repair-filters {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
}

.repair-filters select {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px 12px;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  cursor: pointer;
}

.repairs-list { margin-bottom: 28px; }

.repair-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-bottom: 12px;
  overflow: hidden;
}

.repair-header {
  padding: 18px 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: background 0.15s;
}

.repair-header:hover { background: var(--bg-tertiary); }

.repair-title-area { flex: 1; }

.repair-title-area h4 { font-size: 0.95rem; margin-bottom: 4px; }

.repair-meta {
  display: flex;
  gap: 16px;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.repair-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

.repair-body {
  display: none;
  padding: 0 20px 20px;
  border-top: 1px solid var(--border);
}

.repair-card.open .repair-body { display: block; }
.repair-card.open .repair-header { background: var(--bg-tertiary); }

.repair-section {
  margin-top: 16px;
}

.repair-section h5 {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--accent-cool);
  margin-bottom: 8px;
}

.repair-section ul {
  list-style: none;
}

.repair-section li {
  padding: 4px 0 4px 16px;
  position: relative;
  color: var(--text-secondary);
  font-size: 0.83rem;
  line-height: 1.5;
}

.repair-section li::before {
  content: '·';
  position: absolute;
  left: 0;
  color: var(--text-muted);
  font-weight: 700;
}

.repair-steps { counter-reset: step; }

.repair-step {
  padding: 8px 0 8px 32px;
  position: relative;
  color: var(--text-secondary);
  font-size: 0.83rem;
  line-height: 1.6;
  counter-increment: step;
}

.repair-step::before {
  content: counter(step);
  position: absolute;
  left: 0;
  width: 22px;
  height: 22px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 50%;
  text-align: center;
  line-height: 20px;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
}

.repair-warnings {
  background: rgba(248, 81, 73, 0.05);
  border: 1px solid rgba(248, 81, 73, 0.2);
  border-radius: var(--radius);
  padding: 12px 16px;
  margin-top: 12px;
}

.repair-warnings h5 { color: var(--danger); }

.repair-warnings li::before { color: var(--danger); content: '!'; font-weight: 800; }

.repair-tips {
  background: rgba(78, 205, 196, 0.05);
  border: 1px solid rgba(78, 205, 196, 0.2);
  border-radius: var(--radius);
  padding: 12px 16px;
  margin-top: 12px;
}

.repair-tips h5 { color: var(--accent-cool); }

/* Tools */
.tools-container { margin-bottom: 28px; }

.tool-category {
  margin-bottom: 24px;
}

.tool-category h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.tool-category h3.essential { color: var(--accent); }
.tool-category h3.recommended { color: var(--accent-warm); }
.tool-category h3.specialty { color: var(--accent-cool); }
.tool-category h3.consumables { color: var(--text-muted); }

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 8px;
}

.tool-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
}

.tool-item h4 {
  font-size: 0.85rem;
  margin-bottom: 2px;
}

.tool-item .tool-sizes {
  font-family: var(--font-mono);
  font-size: 0.73rem;
  color: var(--accent-cool);
  margin-bottom: 4px;
}

.tool-item .tool-notes {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.4;
  margin-bottom: 4px;
}

.tool-item .tool-cost {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-warm);
}

/* Parts Sources */
.parts-sources {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
  margin-bottom: 28px;
}

.parts-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.parts-card h3 {
  font-size: 1rem;
  margin-bottom: 4px;
}

.parts-card .parts-type {
  font-size: 0.73rem;
  color: var(--accent-cool);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 10px;
}

.parts-card p {
  font-size: 0.83rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 10px;
}

.parts-card .good-for {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.parts-tag {
  font-size: 0.7rem;
  background: var(--bg-tertiary);
  color: var(--text-muted);
  padding: 3px 8px;
  border-radius: 20px;
  border: 1px solid var(--border);
}

/* Chat Panel */
.chat-panel {
  position: fixed;
  top: 0;
  right: -400px;
  width: var(--chat-width);
  height: 100vh;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  z-index: 200;
  transition: right 0.25s ease;
}

.chat-panel.open { right: 0; }

.chat-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.chat-header h3 {
  font-size: 0.95rem;
  font-weight: 700;
}

.chat-close {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0 4px;
}

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

.chat-user {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  margin-right: 12px;
}

.chat-user-email {
  font-size: 0.7rem;
  color: var(--text-muted);
  max-width: 140px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.chat-logout-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.65rem;
  padding: 2px 8px;
  cursor: pointer;
  transition: all 0.15s;
}

.chat-logout-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-light);
}

.chat-login {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 32px 24px;
  text-align: center;
}

.chat-login-icon {
  font-size: 2rem;
  margin-bottom: 12px;
  opacity: 0.6;
}

.chat-login h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.chat-login p {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 16px;
  line-height: 1.5;
}

.chat-login-form {
  display: flex;
  gap: 8px;
  width: 100%;
  max-width: 300px;
}

.chat-login-form input {
  flex: 1;
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 12px;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  outline: none;
}

.chat-login-form input:focus { border-color: var(--accent); }

.login-status {
  font-size: 0.78rem;
  margin-top: 12px;
  min-height: 1.5em;
}

.login-status.success { color: var(--success); }
.login-status.error { color: var(--danger); }

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.chat-message {
  display: flex;
  max-width: 90%;
}

.chat-message.user { align-self: flex-end; }
.chat-message.assistant { align-self: flex-start; }

.message-content {
  padding: 10px 14px;
  border-radius: var(--radius);
  font-size: 0.85rem;
  line-height: 1.6;
}

.chat-message.user .message-content {
  background: var(--accent);
  color: white;
  border-bottom-right-radius: 2px;
}

.chat-message.assistant .message-content {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-bottom-left-radius: 2px;
}

.chat-input-area {
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 8px;
}

#chat-input {
  flex: 1;
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 12px;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  resize: none;
  outline: none;
}

#chat-input:focus { border-color: var(--accent); }

.chat-send-btn {
  background: var(--accent);
  color: white;
  border: none;
  border-radius: var(--radius);
  padding: 10px 16px;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
  align-self: flex-end;
}

.chat-send-btn:hover { background: #c1303e; }
.chat-send-btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* Loading indicator */
.typing-indicator {
  display: flex;
  gap: 4px;
  padding: 10px 14px;
}

.typing-dot {
  width: 6px;
  height: 6px;
  background: var(--text-muted);
  border-radius: 50%;
  animation: typing 1.2s infinite;
}

.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes typing {
  0%, 100% { opacity: 0.3; transform: translateY(0); }
  50% { opacity: 1; transform: translateY(-3px); }
}

/* Overlay */
.overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 150;
}

.overlay.active { display: block; }

/* Buying guide notes */
.buying-notes {
  background: var(--bg-tertiary);
  border-left: 3px solid var(--accent-warm);
  padding: 12px 16px;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin-top: 16px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Responsive */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.open { transform: translateX(0); }

  .sidebar-close { display: block; }

  .content { margin-left: 0; }

  .menu-toggle { display: block; }

  .page { padding: 20px 16px; }

  .two-col { grid-template-columns: 1fr; }

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

  .source-cards { grid-template-columns: 1fr; }

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

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

  .parts-sources { grid-template-columns: 1fr; }

  .gen-tabs { overflow-x: auto; }

  .chat-panel { width: 100%; right: -100%; }

  .repair-filters { flex-direction: column; }
}

@media (max-width: 480px) {
  .hero h2 { font-size: 1.5rem; }
  .top-bar { padding: 12px 16px; }
  .page-title { font-size: 0.95rem; }
}

/* Transmission Comparison */
.transmission-comparison {
  margin-bottom: 28px;
}

.transmission-comparison h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.trans-intro {
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.6;
  margin-bottom: 16px;
  max-width: 640px;
}

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

.trans-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.trans-card--recommended {
  border-color: var(--success);
  background: linear-gradient(135deg, var(--bg-secondary) 0%, rgba(63, 185, 80, 0.05) 100%);
}

.trans-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  gap: 8px;
}

.trans-card-header h4 {
  font-size: 1rem;
  font-weight: 700;
}

.trans-verdict {
  font-size: 0.65rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.trans-verdict--yes {
  background: rgba(63, 185, 80, 0.15);
  color: var(--success);
}

.trans-verdict--no {
  background: rgba(210, 153, 34, 0.15);
  color: var(--warning);
}

.trans-pros h5, .trans-cons h5, .trans-repairs h5 {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 6px;
  margin-top: 14px;
}

.trans-pros h5 { color: var(--success); }
.trans-cons h5 { color: var(--warning); }
.trans-repairs h5 { color: var(--accent-cool); }

.trans-pros ul, .trans-cons ul {
  list-style: none;
}

.trans-pros li, .trans-cons li {
  padding: 3px 0 3px 16px;
  position: relative;
  color: var(--text-secondary);
  font-size: 0.8rem;
  line-height: 1.5;
}

.trans-pros li::before {
  content: '+';
  position: absolute;
  left: 0;
  color: var(--success);
  font-weight: 700;
}

.trans-cons li::before {
  content: '-';
  position: absolute;
  left: 0;
  color: var(--warning);
  font-weight: 700;
}

.trans-repair {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 12px;
  margin-bottom: 6px;
}

.trans-repair-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 3px;
}

.trans-repair-name {
  font-size: 0.82rem;
  font-weight: 600;
}

.trans-repair-cost {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-warm);
}

.trans-repair-meta {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.trans-repair-notes {
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.trans-bottom-line {
  background: var(--bg-secondary);
  border-left: 3px solid var(--accent-warm);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 14px 18px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.trans-bottom-line strong { color: var(--text-primary); }

@media (max-width: 768px) {
  .trans-grid { grid-template-columns: 1fr; }
}

/* Scrollbar styling */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-light); }