/* ============================================
   CSS CUSTOM PROPERTIES (THEMING)
   ============================================ */

:root {
    /* Light Mode Colors */
    --bg-primary: #f9fafb;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f3f4f6;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-tertiary: #9ca3af;
    --border-color: #e5e7eb;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;
    --primary-dark: #1e40af;
    --hover-bg: #f3f4f6;
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1);
    --shadow-lg: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    
    /* Module pill colors */
    --pill-bg: #eff6ff;
    --pill-text: #1e40af;
    --pill-border: #dbeafe;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 0.75rem;
    --spacing-lg: 1rem;
    --spacing-xl: 1.5rem;
    --spacing-2xl: 2rem;
    
    /* Border radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-pill: 9999px;
    
    /* Transitions */
    --transition: all 0.2s ease;
}

/* Dark Mode */
.dark {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #e5e7eb;
    --text-secondary: #9ca3af;
    --text-tertiary: #6b7280;
    --border-color: #475569;
    --primary: #60a5fa;
    --primary-hover: #93c5fd;
    --primary-light: #1e3a5f;
    --primary-dark: #93c5fd;
    --hover-bg: #475569;
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.3);
    --shadow-lg: 0 4px 6px -1px rgb(0 0 0 / 0.3);
    
    --pill-bg: #1e3a5f;
    --pill-text: #93c5fd;
    --pill-border: #2563eb;
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */

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

html {
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* ============================================
   VIEW MANAGEMENT
   ============================================ */

.view {
    display: none;
}

.view.active {
    display: block;
}

/* ============================================
   HEADER
   ============================================ */

header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: var(--transition);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    max-width: 100%;
}

header h1 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

header nav {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
}

header button {
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

header button:hover {
    color: var(--primary);
    background-color: var(--hover-bg);
}

header button:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

header button svg {
    display: block;
}

/* Theme toggle icons */
.sun-icon {
    display: none;
}

.moon-icon {
    display: block;
}

.dark .sun-icon {
    display: block;
}

.dark .moon-icon {
    display: none;
}

/* Back button */
.back-button {
    font-size: 1rem;
    font-weight: 600;
}

/* ============================================
   CONTAINER
   ============================================ */

.container {
    width: 100%;
    margin: 0 auto;
    padding: 0 1.5rem;
}

main.container {
    padding: var(--spacing-2xl) 1.5rem;
}

/* ============================================
   SEARCH SECTION
   ============================================ */

.search-section {
    margin-bottom: var(--spacing-xl);
}

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

.search-input {
    width: 100%;
    padding: 0.875rem 3rem 0.875rem 1rem;
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    transition: var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.search-input::placeholder {
    color: var(--text-tertiary);
}

.clear-search-btn {
    position: absolute;
    right: 0.5rem;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--radius-sm);
    color: var(--text-tertiary);
    transition: var(--transition);
    display: none;
}

.clear-search-btn.visible {
    display: block;
}

.clear-search-btn:hover {
    color: var(--text-primary);
    background-color: var(--hover-bg);
}

.clear-search-btn:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* ============================================
   OR DIVIDER
   ============================================ */

.divider {
    display: flex;
    align-items: center;
    text-align: center;
    margin: var(--spacing-xl) 0;
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid var(--border-color);
}

.divider span {
    padding: 0 var(--spacing-lg);
}

/* ============================================
   FILTER SECTION
   ============================================ */

.filter-section {
    margin-bottom: var(--spacing-xl);
}

.filter-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.filter-group label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.filter-group select {
    width: 100%;
    padding: 0.75rem;
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
}

.filter-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

/* Reset Button */
.reset-button-container {
    margin-top: var(--spacing-lg);
    display: flex;
    justify-content: flex-end;
}

.reset-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.5rem 0.875rem;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--pill-text);
    background-color: var(--pill-bg);
    border: 1px solid var(--pill-border);
    border-radius: var(--radius-pill);
    cursor: pointer;
    transition: var(--transition);
}

.reset-btn svg {
    width: 14px;
    height: 14px;
}

.reset-btn:hover {
    background-color: #dbeafe;
    border-color: #93c5fd;
    transform: translateY(-1px);
}

.reset-btn:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.reset-btn:active {
    transform: scale(0.97);
}

/* ============================================
   MARKET SELECTOR
   ============================================ */

.market-section {
    margin-bottom: var(--spacing-2xl);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.market-toggle {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg) var(--spacing-xl);
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    transition: var(--transition);
}

.market-toggle:hover {
    background-color: var(--hover-bg);
}

.market-toggle .chevron {
    transition: transform 0.3s ease;
    color: var(--text-secondary);
}

.market-toggle[aria-expanded="true"] .chevron {
    transform: rotate(180deg);
}

.market-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.market-content.open {
    max-height: 500px;
}

.market-actions {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-lg) var(--spacing-xl);
    padding-top: 0;
    border-top: 1px solid var(--border-color);
}

.action-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 0.875rem;
    font-weight: 500;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
}

.action-btn:hover {
    background-color: var(--hover-bg);
    border-color: var(--primary);
}

.market-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    padding: var(--spacing-lg) var(--spacing-xl);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.checkbox-label:hover {
    background-color: var(--hover-bg);
}

.checkbox-label input[type="checkbox"] {
    width: 1.125rem;
    height: 1.125rem;
    cursor: pointer;
    accent-color: var(--primary);
}

.checkbox-label span {
    font-size: 0.9375rem;
}

/* ============================================
   RESULTS SECTION
   ============================================ */

.results-section {
    margin-top: var(--spacing-2xl);
}

.results-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
}

/* ============================================
   VEHICLE CARD
   ============================================ */

.vehicle-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.vehicle-card:hover {
    box-shadow: var(--shadow-lg);
}

.vehicle-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: var(--spacing-xl);
}

.vehicle-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.info-group h3 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.modules-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.module-pill {
    display: inline-block;
    padding: 0.375rem 0.875rem;
    font-size: 0.8125rem;
    font-weight: 600;
    background-color: var(--pill-bg);
    color: var(--pill-text);
    border: 1px solid var(--pill-border);
    border-radius: var(--radius-pill);
    cursor: pointer;
    transition: var(--transition);
}

.module-pill:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.markets-text {
    font-size: 0.9375rem;
    color: var(--text-primary);
}

/* ============================================
   TOOLTIP
   ============================================ */

.tooltip {
    position: absolute;
    background-color: var(--text-primary);
    color: var(--bg-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s ease;
    z-index: 1000;
    box-shadow: var(--shadow-lg);
}

.tooltip.visible {
    opacity: 1;
}

/* ============================================
   REFERENCE PAGE
   ============================================ */

.reference-content {
    max-width: 800px;
}

.reference-content h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-2xl);
    color: var(--text-primary);
}

.reference-section {
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-2xl);
    border-bottom: 1px solid var(--border-color);
}

.reference-section:last-child {
    border-bottom: none;
}

.reference-section h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xl);
    color: var(--text-primary);
}

.reference-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.reference-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-md);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
}

.reference-item .module-pill {
    flex-shrink: 0;
    cursor: default;
}

.reference-item strong {
    flex-shrink: 0;
    min-width: 100px;
    font-weight: 600;
    color: var(--text-primary);
}

.reference-definition {
    color: var(--text-secondary);
}

.reference-section p {
    margin-bottom: var(--spacing-lg);
    color: var(--text-secondary);
    line-height: 1.6;
}

.disclaimer {
    font-size: 0.875rem;
    font-style: italic;
    color: var(--text-tertiary);
}

/* ============================================
   FOOTER
   ============================================ */

footer {
    margin-top: var(--spacing-2xl);
    padding: var(--spacing-2xl) 0;
    border-top: 1px solid var(--border-color);
}

footer p {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    text-align: center;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

/* Tablet (600px+) */
@media (min-width: 600px) {
    header .container {
        max-width: 740px;
    }
    
    .container {
        max-width: 740px;
    }
    
    .filter-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .market-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .results-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Desktop (900px+) */
@media (min-width: 900px) {
    header .container {
        max-width: 1140px;
    }
    
    .container {
        max-width: 1140px;
    }
    
    .results-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Large Desktop (1600px+) */
@media (min-width: 1600px) {
    header .container {
        max-width: 1520px;
    }
    
    .container {
        max-width: 1520px;
    }
    
    .results-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* ============================================
   ACCESSIBILITY
   ============================================ */

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Focus styles */
button:focus-visible,
input:focus-visible,
select:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
    header nav {
        display: none;
    }
    
    .search-section,
    .filter-section,
    .market-section {
        display: none;
    }
    
    .vehicle-card {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ccc;
    }
}

/* ============================================
   MARKET FILTER MODAL
   ============================================ */

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    animation: fadeIn 0.2s ease;
}

.modal.active {
    display: block;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(2px);
}

.modal-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    max-width: 500px;
    width: 90%;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    animation: slideUp 0.3s ease;
}

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

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translate(-50%, -45%);
    }
    to {
        opacity: 1;
        transform: translate(-50%, -50%);
    }
}

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

.modal-header h2 {
    margin: 0;
    font-size: 1.25rem;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.75rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

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

.modal-body {
    padding: var(--spacing-xl);
    overflow-y: auto;
    flex: 1;
}

.quick-filters {
    margin-bottom: var(--spacing-xl);
}

.quick-filters h3 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.toggle-label {
    display: flex;
    align-items: center;
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
}

.toggle-label:hover {
    background-color: var(--hover-bg);
}

.toggle-label input[type="checkbox"] {
    margin-right: var(--spacing-md);
    cursor: pointer;
}

.toggle-label span {
    font-size: 0.9375rem;
    color: var(--text-primary);
}

.divider {
    height: 1px;
    background-color: var(--border-color);
    margin: var(--spacing-xl) 0;
}

.advanced-settings summary {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--primary);
    cursor: pointer;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    transition: var(--transition);
    user-select: none;
}

.advanced-settings summary:hover {
    background-color: var(--hover-bg);
}

.advanced-settings[open] summary {
    margin-bottom: var(--spacing-lg);
}

.market-group {
    margin-bottom: var(--spacing-xl);
}

.market-group h4 {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.market-group label {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) 0;
    font-size: 0.875rem;
    color: var(--text-primary);
    cursor: pointer;
}

.market-group label:hover {
    color: var(--primary);
}

.market-checkbox {
    margin-right: var(--spacing-md);
    cursor: pointer;
}

.modal-footer {
    display: flex;
    justify-content: space-between;
    gap: var(--spacing-md);
    padding: var(--spacing-xl);
    border-top: 1px solid var(--border-color);
}

.btn-primary,
.btn-secondary {
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

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

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

.btn-primary:active {
    transform: scale(0.98);
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

.btn-secondary:active {
    transform: scale(0.98);
}

/* Mobile adjustments */
@media (max-width: 640px) {
    .modal-content {
        max-width: 95%;
        max-height: 90vh;
    }
    
    .modal-header,
    .modal-body,
    .modal-footer {
        padding: var(--spacing-lg);
    }
}

/* ============================================
   VIEW SWITCHING
   ============================================ */

.view {
    display: none;
}

.view.active {
    display: block;
}

/* ============================================
   HOMEPAGE - HERO SECTION
   ============================================ */

.hero-section {
    text-align: center;
    padding: 3rem 0 2rem;
}

.hero-section h2 {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.hero-section .subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 0;
}

@media (max-width: 768px) {
    .hero-section {
        padding: 2rem 0 1.5rem;
    }
    
    .hero-section h2 {
        font-size: 1.5rem;
    }
    
    .hero-section .subtitle {
        font-size: 1rem;
    }
}

/* ============================================
   TOOL GRID & CARDS
   ============================================ */

.tool-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin-top: 2rem;
    margin-bottom: 3rem;
}

@media (min-width: 768px) {
    .tool-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 2rem;
    }
}

.tool-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    min-height: 280px;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
}

@media (max-width: 768px) {
    .tool-card {
        padding: 1.5rem;
        min-height: 200px;
    }
}

/* Active Tool Card (Bosch) */
.tool-card-active {
    cursor: pointer;
}

.tool-card-active:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

/* Disabled Tool Cards (Coming Soon) */
.tool-card-disabled {
    opacity: 0.8;
    cursor: not-allowed;
}

/* Tool Card Header */
.tool-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.5rem;
}

.tool-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 0.75rem 0;
}

.tool-subtitle {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin: 0 0 0.5rem 0;
}

.tool-count {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary);
    margin: 0 0 auto 0;
}

.tool-description {
    font-size: 0.9375rem;
    color: var(--text-tertiary);
    margin: 0 0 auto 0;
    line-height: 1.5;
}

/* Coming Soon Badge */
.coming-soon-badge {
    display: inline-block;
    background: #fef3c7;
    color: #92400e;
    border: 1px solid #fde68a;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-pill);
    font-size: 0.75rem;
    font-weight: 600;
    white-space: nowrap;
}

.dark .coming-soon-badge {
    background: #854d0e;
    color: #fef08a;
    border-color: #a16207;
}

/* Tool Card Buttons */
.tool-button {
    width: 100%;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 1.5rem;
}

.tool-card-active .tool-button {
    background: var(--primary);
    color: white;
}

.tool-card-active .tool-button:hover {
    background: var(--primary-hover);
}

.tool-button-disabled {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    cursor: not-allowed;
}

.tool-button-disabled:hover {
    background: var(--bg-tertiary);
}

/* ============================================
   BACK BUTTON
   ============================================ */

.back-button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 0.9375rem;
    font-weight: 500;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    margin-bottom: 1rem;
}

.back-button:hover {
    background: var(--hover-bg);
    color: var(--text-primary);
}

.back-button svg {
    flex-shrink: 0;
}

/* ============================================
   NAVIGATION LABEL (Desktop only)
   ============================================ */

.nav-label {
    display: none;
    margin-left: 0.5rem;
    font-size: 0.9375rem;
    font-weight: 500;
}

@media (min-width: 640px) {
    .nav-label {
        display: inline;
    }
}

/* ============================================
   MAIN HEADER (Bosch view)
   ============================================ */

.main-header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
}

.main-header h1 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.main-header nav {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

/* ============================================
   RESPONSIVE ADJUSTMENTS
   ============================================ */

@media (max-width: 768px) {
    /* Stack tool cards on mobile - Bosch first */
    .tool-grid {
        grid-template-columns: 1fr;
    }
}

@media (min-width: 768px) and (max-width: 1024px) {
    /* 2 column layout for tablets */
    .tool-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* Bosch takes full width on first row */
    .tool-card:first-child {
        grid-column: span 2;
    }
}


/* ============================================
   HEADER WITH BACK BUTTON
   ============================================ */

header .back-button {
    margin-bottom: 0;
    padding: 0.5rem;
}

header h1 {
    margin: 0;
}

/* ============================================
   TESLA EDR VIEW
   ============================================ */

/* Tesla Info Banner */
.tesla-info {
    background: var(--bg-secondary);
    border-left: 4px solid var(--primary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.dark .tesla-info {
    background: var(--bg-secondary);
    border-left-color: var(--primary);
}

.tesla-info h2 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 0.75rem 0;
}

.dark .tesla-info h2 {
    color: var(--text-primary);
}

.tesla-info p {
    color: var(--text-secondary);
    margin: 0 0 0.75rem 0;
    line-height: 1.5;
}

.tesla-info ul {
    margin: 0;
    padding-left: 1.5rem;
    list-style: disc;
}

.tesla-info li {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    line-height: 1.5;
}

.dark .tesla-info li {
    color: var(--text-secondary);
}

.tesla-info a {
    color: var(--primary);
    text-decoration: underline;
}

.dark .tesla-info a {
    color: var(--primary-light);
}

/* Tesla Model Section */
.tesla-model-section {
    margin-bottom: 2rem;
}

.tesla-model-section h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.tesla-model-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}

@media (min-width: 768px) {
    .tesla-model-grid {
        grid-template-columns: repeat(5, 1fr);
    }
}

.tesla-model-btn {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.tesla-model-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-light);
}

.tesla-model-btn.active {
    border-color: var(--primary);
    background: var(--primary);
    color: white;
}

/* Tesla Variants Section */
.tesla-variants-section {
    margin-bottom: 2rem;
}

.tesla-variants-section h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

#teslaVariantsContainer {
    display: grid;
    gap: 1.5rem;
}

.tesla-variant-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    transition: var(--transition);
}

.tesla-variant-card:hover {
    box-shadow: var(--shadow-lg);
}

.tesla-variant-card h4 {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 1rem 0;
}

.tesla-variant-info {
    display: grid;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.tesla-variant-info-item {
    display: flex;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.tesla-variant-info-item strong {
    color: var(--text-primary);
    min-width: 100px;
}

.tesla-variant-links {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.tesla-variant-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    background: var(--primary);
    color: white;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9375rem;
    transition: var(--transition);
}

.tesla-variant-link:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.tesla-variant-link svg {
    flex-shrink: 0;
}

.tesla-variant-link.disabled {
    background: var(--bg-tertiary);
    color: var(--text-tertiary);
    cursor: not-allowed;
}

.tesla-variant-link.disabled:hover {
    transform: none;
}

/* Tesla Resources Section */
.tesla-resources-section {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.tesla-resources-section h3 {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

.tesla-resource-links {
    display: grid;
    gap: 1rem;
}

@media (min-width: 768px) {
    .tesla-resource-links {
        grid-template-columns: 1fr;
        max-width: 400px;
    }
}

.resource-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.resource-link:hover {
    border-color: var(--primary);
    color: var(--primary);
    box-shadow: var(--shadow);
}

.resource-link svg {
    flex-shrink: 0;
    color: var(--primary);
}