/* Reset and Base Styles */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* Colors - Sim Racing Theme */
    --color-primary: #FF1E1E;
    --color-primary-dark: #E01A1A;
    --color-primary-light: #FF4444;
    
    --color-secondary: #1A1A1A;
    --color-secondary-dark: #000000;
    --color-secondary-light: #333333;
    
    --color-accent: #FFD700;
    --color-accent-dark: #FFC107;
    
    --color-background: #0F0F0F;
    --color-surface: #1E1E1E;
    --color-surface-light: #2A2A2A;
    
    --color-text-primary: #FFFFFF;
    --color-text-secondary: #B0B0B0;
    --color-text-muted: #808080;
    
    --color-success: #00D084;
    --color-warning: #FF8C00;
    --color-error: #FF4444;
    --color-info: #00B4FF;
    
    /* Tire Health Colors */
    --color-tire-perfect: #00D084;
    --color-tire-good: #FF8C00;
    --color-tire-worn: #FF4444;
    --color-tire-dead: #666666;
    
    /* Typography */
    --font-primary: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', 'Consolas', monospace;
    
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    
    /* Border radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.25);
    
    /* Transitions */
    --transition-fast: 0.15s ease-out;
    --transition-base: 0.25s ease-out;
    --transition-slow: 0.35s ease-out;
}

body {
    font-family: var(--font-primary);
    background: var(--color-background);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-4);
}

/* Header */
.header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-surface-light);
    position: sticky;
    top: 0;
    z-index: 50;
    backdrop-filter: blur(10px);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 4rem;
}

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

.logo-link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-xl);
    color: var(--color-text-primary);
    text-decoration: none;
    transition: all var(--transition-base);
}

.logo-link:hover {
    color: var(--color-primary);
    transform: translateY(-1px);
}

.logo-icon {
    font-size: var(--font-size-2xl);
}

.nav {
    display: flex;
    gap: var(--space-2);
}

.nav-button {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--color-surface-light);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-base);
}

.nav-button:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
    transform: translateY(-1px);
}

/* Main Layout */
.main {
    padding: var(--space-6) 0;
}

.main-grid {
    display: grid;
    grid-template-columns: 400px 1fr;
    gap: var(--space-6);
    min-height: 70vh;
}

/* Panel Styles */
.panel {
    background: var(--color-surface);
    border: 1px solid var(--color-surface-light);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    box-shadow: var(--shadow-lg);
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-6);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--color-surface-light);
}

.panel-title {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
}

.panel-icon {
    font-size: var(--font-size-2xl);
}

/* Tire Inventory */
.tire-inventory-panel {
    position: sticky;
    top: calc(4rem + var(--space-6));
    max-height: calc(100vh - 8rem);
    overflow-y: auto;
}


.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-3);
    margin-bottom: var(--space-6);
}

.stat-card {
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    text-align: center;
    border: 1px solid;
    transition: transform var(--transition-base);
}

.stat-card:hover {
    transform: translateY(-2px);
}

.stat-perfect {
    background: rgba(0, 208, 132, 0.1);
    border-color: var(--color-tire-perfect);
}

.stat-good {
    background: rgba(255, 140, 0, 0.1);
    border-color: var(--color-tire-good);
}

.stat-worn {
    background: rgba(255, 68, 68, 0.1);
    border-color: var(--color-tire-worn);
}

.stat-dead {
    background: rgba(102, 102, 102, 0.1);
    border-color: var(--color-tire-dead);
}

.stat-value {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    font-family: var(--font-mono);
}

.stat-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: var(--space-1);
}

.tire-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-3);
}

/* Tire Card */
.tire-card {
    background: var(--color-surface-light);
    border: 2px solid transparent;
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.tire-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--color-tire-perfect);
    transition: all var(--transition-base);
}

.tire-card.tire-good::before {
    background: var(--color-tire-good);
}

.tire-card.tire-worn::before {
    background: var(--color-tire-worn);
}

.tire-card.tire-dead::before {
    background: var(--color-tire-dead);
}

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

.tire-card.selected {
    border-color: var(--color-primary);
    background: rgba(255, 30, 30, 0.1);
    box-shadow: 0 0 0 4px rgba(255, 30, 30, 0.2);
}

.tire-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-3);
}

.tire-name {
    font-family: var(--font-mono);
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-lg);
    color: var(--color-text-primary);
}

.tire-health {
    font-family: var(--font-mono);
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-sm);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.1);
}

.tire-visual {
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    overflow: hidden;
    margin-bottom: var(--space-3);
}

.tire-visual-fill {
    height: 100%;
    border-radius: var(--radius-sm);
    transition: all var(--transition-slow);
}

.tire-stints {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-1);
    min-height: 1.5rem;
}

.stint-badge {
    font-family: var(--font-mono);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    padding: var(--space-1) var(--space-2);
    background: var(--color-primary);
    color: white;
    border-radius: var(--radius-sm);
}

.stint-badge-empty {
    color: var(--color-text-muted);
    font-style: italic;
    font-size: var(--font-size-xs);
}

/* Stints Panel */
.stints-panel {
    overflow-y: auto;
}

.stints-container {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.stint {
    background: var(--color-surface-light);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    transition: all var(--transition-base);
}

.stint:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.stint-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-4);
    padding-bottom: var(--space-3);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.stint-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
}

.stint-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}

.stint-driver {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.stint-driver input {
    background: var(--color-surface);
    border: 1px solid var(--color-surface-light);
    border-radius: var(--radius-sm);
    padding: var(--space-2) var(--space-3);
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    width: 200px;
}

.stint-driver input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(255, 30, 30, 0.2);
}

.stint-tires {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: var(--space-3);
    min-height: 100px;
    padding: var(--space-4);
    background: var(--color-surface);
    border: 2px dashed var(--color-surface-light);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    cursor: pointer;
}

.stint-tires:hover,
.stint-tires.drop-active {
    border-color: var(--color-primary);
    background: rgba(255, 30, 30, 0.05);
}

.tire-in-stint {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: white;
    padding: var(--space-3);
    border-radius: var(--radius-md);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
}

.tire-in-stint:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-md);
}

.tire-in-stint-number {
    font-family: var(--font-mono);
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-1);
}

.tire-in-stint-health {
    font-family: var(--font-mono);
    font-size: var(--font-size-xs);
    opacity: 0.9;
}

.stint-empty {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    font-style: italic;
    text-align: center;
    padding: var(--space-8);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    background: none;
    color: inherit;
    font-family: inherit;
}

.btn-sm {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-xs);
}

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

.btn-primary:hover {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--color-surface-light);
    border-color: var(--color-surface-light);
    color: var(--color-text-primary);
}

.btn-secondary:hover {
    background: var(--color-surface);
    border-color: var(--color-surface);
    transform: translateY(-1px);
}

.btn-danger {
    background: var(--color-error);
    border-color: var(--color-error);
    color: white;
}

.btn-danger:hover {
    background: #E03A3A;
    border-color: #E03A3A;
}

.btn-icon {
    font-size: var(--font-size-base);
}

/* Controls */
.controls {
    background: var(--color-surface);
    border-top: 1px solid var(--color-surface-light);
    padding: var(--space-5) 0;
}

.controls-content {
    display: flex;
    justify-content: center;
    gap: var(--space-4);
    flex-wrap: wrap;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 100;
    display: none;
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--color-surface);
    border: 1px solid var(--color-surface-light);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    width: 90vw;
    max-width: 500px;
    max-height: 90vh;
    overflow: hidden;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-6);
    border-bottom: 1px solid var(--color-surface-light);
}

.modal-header h2 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
}

.modal-close {
    width: 2rem;
    height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    font-size: var(--font-size-xl);
    cursor: pointer;
    transition: all var(--transition-base);
}

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

.modal-body {
    padding: var(--space-6);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-3);
    padding: var(--space-6);
    border-top: 1px solid var(--color-surface-light);
}

/* Config Styles */
.config-section {
    margin-bottom: var(--space-6);
}

.config-label {
    display: block;
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
    margin-bottom: var(--space-3);
}

.config-slider {
    width: 100%;
    height: 6px;
    background: var(--color-surface-light);
    border-radius: var(--radius-sm);
    outline: none;
    margin: var(--space-3) 0;
}

.config-slider::-webkit-slider-thumb {
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--color-primary);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
}

.config-slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--color-primary);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-sm);
}

.config-value {
    display: inline-block;
    font-family: var(--font-mono);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    margin-left: var(--space-2);
}

.config-section-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin: var(--space-6) 0 var(--space-4) 0;
    padding-bottom: var(--space-2);
    border-bottom: 1px solid var(--color-surface-light);
}

/* Tire Selector Modal */
.tire-selector-modal .modal-content {
    max-width: 90vw;
    max-height: 90vh;
    width: 600px;
}

.tire-filter-tabs {
    display: flex;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
    border-bottom: 1px solid var(--color-surface-light);
    padding-bottom: var(--space-3);
}

.filter-tab {
    background: transparent;
    border: 1px solid var(--color-surface-light);
    color: var(--color-text-secondary);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-base);
    flex: 1;
    text-align: center;
    min-height: 44px; /* Touch-friendly */
}

.filter-tab:hover {
    background: var(--color-surface-light);
    border-color: var(--color-primary);
}

.filter-tab.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}

.tire-selector-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: var(--space-3);
    max-height: 400px;
    overflow-y: auto;
    padding-right: var(--space-2);
}

.tire-selector-item {
    background: var(--color-surface-light);
    border: 2px solid transparent;
    border-radius: var(--radius-lg);
    padding: var(--space-3);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
    min-height: 80px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
}

.tire-selector-item:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

.tire-selector-item.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.tire-selector-item.disabled:hover {
    border-color: transparent;
    transform: none;
}

.tire-selector-item .tire-code {
    font-family: var(--font-mono);
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
    margin-bottom: var(--space-1);
}

.tire-selector-item .tire-health {
    font-size: var(--font-size-xs);
    opacity: 0.8;
}

.tire-selector-item .tire-status-badge {
    position: absolute;
    top: -6px;
    right: -6px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    border: 2px solid var(--color-surface);
}

.tire-selector-item.perfect .tire-status-badge {
    background: var(--color-tire-perfect);
}

.tire-selector-item.good .tire-status-badge {
    background: var(--color-tire-good);
}

.tire-selector-item.worn .tire-status-badge {
    background: var(--color-tire-worn);
}

.tire-selector-item.dead .tire-status-badge {
    background: var(--color-tire-dead);
}

.tire-selector-empty {
    text-align: center;
    padding: var(--space-8);
    color: var(--color-text-muted);
}

.tire-selector-empty .empty-icon {
    width: 48px;
    height: 48px;
    margin-bottom: var(--space-4);
    opacity: 0.5;
}

/* Mobile optimizations for tire selector */
@media (max-width: 768px) {
    .tire-selector-modal .modal-content {
        width: 95vw;
        max-width: 95vw;
        margin: var(--space-4);
        max-height: 85vh;
    }
    
    .tire-filter-tabs {
        flex-wrap: wrap;
        gap: var(--space-2);
    }
    
    .filter-tab {
        min-height: 48px; /* Bigger touch targets on mobile */
        font-size: var(--font-size-base);
    }
    
    .tire-selector-grid {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
        gap: var(--space-4);
        max-height: 50vh;
    }
    
    .tire-selector-item {
        min-height: 100px;
        padding: var(--space-4);
    }
    
    .tire-selector-item .tire-code {
        font-size: var(--font-size-base);
    }
    
    .tire-selector-item .tire-health {
        font-size: var(--font-size-sm);
    }
}

/* Enhanced stint styles for mobile interaction */
.stint-tires {
    position: relative;
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
    align-items: flex-start;
    justify-content: space-between;
}

.stint-add-tire {
    background: var(--color-surface-light);
    border: 2px dashed var(--color-surface-lighter);
    border-radius: var(--radius-md);
    padding: var(--space-3);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-base);
    min-height: 60px;
    color: var(--color-text-muted);
    flex: 1 1 0;
    min-width: 0;
}

.tire-in-stint {
    flex: 1 1 0;
    min-width: 0;
}

.stint-add-tire:hover {
    border-color: var(--color-primary);
    background: rgba(255, 30, 30, 0.1);
    color: var(--color-primary);
    transform: translateY(-2px);
}

.stint-add-icon {
    font-size: var(--font-size-xl);
    font-weight: bold;
    margin-bottom: var(--space-1);
    line-height: 1;
}

.stint-add-text {
    font-size: var(--font-size-xs);
    text-align: center;
    font-weight: var(--font-weight-medium);
}

@media (max-width: 768px) {
    .stint-tires {
        gap: var(--space-3);
    }
    
    .stint-add-tire {
        min-height: 70px;
        padding: var(--space-4);
    }
    
    .stint-add-icon {
        font-size: var(--font-size-2xl);
    }
    
    .stint-add-text {
        font-size: var(--font-size-sm);
    }
}

.stint-tires.mobile-interactive {
    cursor: pointer;
    padding: var(--space-2);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.stint-tires.mobile-interactive:hover {
    background: rgba(255, 30, 30, 0.1);
    border-color: var(--color-primary);
}

.stint-tires.mobile-interactive::after {
    content: '';
    position: absolute;
    top: 50%;
    right: var(--space-2);
    transform: translateY(-50%);
    width: 0;
    height: 0;
    border-left: 6px solid var(--color-text-muted);
    border-top: 4px solid transparent;
    border-bottom: 4px solid transparent;
    opacity: 0.7;
}

@media (max-width: 768px) {
    .stint-tires.mobile-interactive::after {
        opacity: 1;
        border-left-color: var(--color-primary);
    }
}

/* Long press feedback */
.tire-item.long-press-active,
.tire-in-stint.long-press-active {
    background: rgba(255, 68, 68, 0.2);
    transform: scale(0.95);
    transition: all 0.1s ease;
}

/* Mobile remove indicator for tires in stints */
.remove-indicator {
    position: absolute;
    top: -8px;
    right: -8px;
    width: 20px;
    height: 20px;
    background: var(--color-error);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: bold;
    line-height: 1;
    opacity: 0.8;
}

/* Enhanced tire in stint styles for mobile */
.tire-in-stint {
    position: relative;
    user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
}

@media (max-width: 768px) {
    .tire-in-stint {
        padding: var(--space-3);
        min-height: 50px;
        cursor: pointer;
    }
    
    .remove-indicator {
        opacity: 0.9;
    }
}

/* Responsive Design */
@media (max-width: 1024px) {
    .main-grid {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }
    
    .tire-inventory-panel {
        position: static;
        max-height: none;
    }
    
    .tire-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-3);
    }
    
    .header-content {
        flex-direction: column;
        height: auto;
        padding: var(--space-3) 0;
        gap: var(--space-3);
    }
    
    .nav {
        width: 100%;
        justify-content: center;
    }
    
    .nav-button {
        flex: 1;
        justify-content: center;
    }
    
    .tire-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stint-tires {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    }
    
    .controls-content {
        flex-direction: column;
        align-items: center;
    }
    
    .controls-content .btn {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .tire-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .stint-tires {
        grid-template-columns: 1fr;
    }
}

/* Notifications System */
.notifications {
    position: fixed;
    top: 100px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 12px;
    pointer-events: none;
    max-width: 400px;
}

.notification {
    pointer-events: auto;
    background: var(--color-surface);
    border: 1px solid var(--color-surface-light);
    border-radius: 8px;
    padding: 16px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    gap: 12px;
    transform: translateX(100%);
    opacity: 0;
    transition: all 0.3s ease;
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
}

.notification.show {
    transform: translateX(0);
    opacity: 1;
}

.notification.hide {
    transform: translateX(100%);
    opacity: 0;
}

.notification-success {
    border-left: 4px solid var(--color-success);
}

.notification-error {
    border-left: 4px solid var(--color-error);
}

.notification-warning {
    border-left: 4px solid var(--color-warning);
}

.notification-info {
    border-left: 4px solid var(--color-info);
}

.notification-icon {
    flex-shrink: 0;
}

.notification-message {
    flex: 1;
    font-weight: 500;
}

/* Modern CSS Custom Scrollbars - Sim Racing Theme */

/* Default scrollbar styles for all scrollable elements */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--color-primary) transparent;
}

/* Webkit scrollbar styles (Chrome, Safari, Edge) */
*::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

*::-webkit-scrollbar-track {
    background: transparent;
}

*::-webkit-scrollbar-thumb {
    background: var(--color-primary);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

*::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary-light);
    transform: scaleX(1.2);
}

*::-webkit-scrollbar-thumb:active {
    background: var(--color-primary-dark);
}

/* Custom scrollbar for tire inventory */
.tire-inventory-panel {
    scrollbar-width: thin;
    scrollbar-color: var(--color-primary) rgba(30, 30, 30, 0.2);
    overflow-y: auto;
    scroll-behavior: smooth;
}

.tire-inventory-panel::-webkit-scrollbar {
    width: 10px;
}

.tire-inventory-panel::-webkit-scrollbar-track {
    background: rgba(30, 30, 30, 0.2);
    border-radius: var(--radius-lg);
    margin: var(--space-2);
}

.tire-inventory-panel::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    border-radius: var(--radius-lg);
    border: 2px solid rgba(30, 30, 30, 0.2);
    box-shadow: 0 2px 8px rgba(255, 30, 30, 0.3);
    transition: all var(--transition-base);
}

.tire-inventory-panel::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
    border: 2px solid rgba(30, 30, 30, 0.1);
    box-shadow: 0 4px 12px rgba(255, 30, 30, 0.4);
    transform: scaleX(1.1);
}

.tire-inventory-panel::-webkit-scrollbar-thumb:active {
    background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
    transform: scaleX(1.2);
}

/* Stints container - no scrollbar, natural height extension */
.stints-container {
    /* No height limitation - stints extend naturally */
    overflow-y: visible;
}

/* Mobile responsive scrollbars */
@media (max-width: 768px) {
    .tire-inventory-panel::-webkit-scrollbar {
        width: 6px;
    }
    
    .tire-inventory-panel::-webkit-scrollbar-thumb {
        border: 1px solid transparent;
    }
}

/* Smooth scrolling for better UX */
html {
    scroll-behavior: smooth;
}

.tire-inventory-panel {
    scroll-behavior: smooth;
}
/* ==============================================
   POSITION SYSTEM STYLES
   Tire position management with visual grid
   ============================================== */

/* Position badges on tire cards */
.tire-position {
    margin: var(--space-2) 0;
}

.position-badge {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: var(--font-weight-semibold);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Front positions (red/orange) */
.position-FL, .position-FR {
    background: linear-gradient(135deg, #FF4444, #FF6B6B);
    color: white;
    box-shadow: 0 2px 4px rgba(255, 68, 68, 0.3);
}

/* Rear positions (blue) */
.position-RL, .position-RR {
    background: linear-gradient(135deg, #00B4FF, #0099DD);
    color: white;
    box-shadow: 0 2px 4px rgba(0, 180, 255, 0.3);
}

/* ==============================================
   TIRE POSITIONS GRID
   4-slot grid for tire assignment by position
   ============================================== */

.tire-positions-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr;
    gap: var(--space-4);
    padding: var(--space-4);
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-4);
}

.position-slot {
    min-height: 120px;
    padding: var(--space-4);
    border: 2px dashed var(--color-surface-light);
    border-radius: var(--radius-md);
    background: var(--color-surface-light);
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    position: relative;
}

.position-slot:hover {
    border-color: var(--color-primary);
    background: rgba(255, 30, 30, 0.05);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.position-slot.occupied {
    border-style: solid;
    border-color: var(--color-primary);
    background: rgba(255, 30, 30, 0.1);
}

.position-label {
    font-family: var(--font-mono);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.position-empty-state {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    font-style: italic;
    font-size: var(--font-size-sm);
}

/* Tire in position slot */
.tire-in-position {
    flex: 1;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    border-radius: var(--radius-md);
    padding: var(--space-3);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    color: white;
    position: relative;
}

.tire-number {
    font-family: var(--font-mono);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
}

.tire-health-display {
    font-family: var(--font-mono);
    font-size: var(--font-size-xs);
    opacity: 0.9;
}

.remove-tire-btn {
    position: absolute;
    top: -8px;
    right: -8px;
    width: 24px;
    height: 24px;
    background: var(--color-error);
    color: white;
    border: 2px solid var(--color-surface);
    border-radius: 50%;
    font-size: 16px;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
}

.remove-tire-btn:hover {
    background: #E03A3A;
    transform: scale(1.1);
}

/* ==============================================
   CAR SCHEMATIC VISUALIZATION
   Visual representation of tire positions
   ============================================== */

.car-schematic {
    margin-top: var(--space-4);
    padding: var(--space-4);
    background: var(--color-surface-light);
    border-radius: var(--radius-lg);
}

.car-body {
    max-width: 300px;
    margin: 0 auto;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.02));
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    border: 2px solid rgba(255, 255, 255, 0.1);
}

.car-front, .car-rear {
    text-align: center;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: var(--space-2);
}

.car-row {
    display: flex;
    justify-content: space-between;
    gap: var(--space-3);
    margin: var(--space-3) 0;
}

.car-tire {
    flex: 1;
    padding: var(--space-3);
    border-radius: var(--radius-md);
    text-align: center;
    font-family: var(--font-mono);
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-sm);
    background: var(--color-surface);
    border: 2px solid var(--color-surface-light);
    transition: all var(--transition-base);
}

.car-tire.empty {
    color: var(--color-text-muted);
    border-style: dashed;
}

/* Health-based colors for car schematic */
.car-tire.tire-perfect {
    background: rgba(0, 208, 132, 0.2);
    border-color: var(--color-tire-perfect);
    color: var(--color-tire-perfect);
}

.car-tire.tire-good {
    background: rgba(255, 140, 0, 0.2);
    border-color: var(--color-tire-good);
    color: var(--color-tire-good);
}

.car-tire.tire-worn {
    background: rgba(255, 68, 68, 0.2);
    border-color: var(--color-tire-worn);
    color: var(--color-tire-worn);
}

.car-tire.tire-dead {
    background: rgba(102, 102, 102, 0.2);
    border-color: var(--color-tire-dead);
    color: var(--color-tire-dead);
}

/* ==============================================
   RESPONSIVE ADJUSTMENTS FOR POSITIONS
   ============================================== */

@media (max-width: 768px) {
    .tire-positions-grid {
        gap: var(--space-3);
    }
    
    .position-slot {
        min-height: 100px;
    }
    
    .car-body {
        max-width: 100%;
    }
    
    .car-tire {
        font-size: var(--font-size-xs);
        padding: var(--space-2);
    }
}

@media (max-width: 480px) {
    .tire-positions-grid {
        gap: var(--space-2);
    }
    
    .position-slot {
        min-height: 80px;
        padding: var(--space-3);
    }
}