:root {
    --surface: #131313;
    --surface-container-lowest: #0e0e0e;
    --surface-container-low: #1c1b1b;
    --surface-container: #201f1f;
    --surface-container-high: #2a2a2a;
    --primary: #adc6ff;
    --primary-container: #006de6;
    --on-surface: #e5e2e1;
    --on-surface-variant: #c2c6d8;
    --outline-variant: rgba(66, 70, 86, 0.15); 
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--surface);
    color: var(--on-surface);
    overflow: hidden;
    display: flex;
    height: 100vh;
}

header { 
    position: absolute; 
    top: 0; 
    width: 100%; 
    height: 64px; 
    display: flex; 
    align-items: center; 
    padding: 0 32px; 
    z-index: 50; 
    background: transparent; 
}

.logo { 
    font-size: 1.25rem; 
    font-weight: 900; 
    font-style: italic; 
    letter-spacing: -0.05em; 
    color: var(--primary); 
    margin-right: 40px; 
}

nav { 
    display: flex; 
    gap: 24px; 
}

nav a { 
    color: var(--on-surface-variant); 
    text-decoration: none; 
    font-size: 0.75rem; 
    font-weight: 700; 
    text-transform: uppercase; 
    letter-spacing: 0.1em; 
}

nav a.active { 
    color: var(--primary); 
    border-bottom: 2px solid var(--primary); 
    padding-bottom: 4px; 
}

.header-icons { 
    margin-left: auto; 
    display: flex; 
    gap: 16px; 
    color: var(--on-surface-variant); 
}

#paint-lab { 
    width: 320px; 
    background-color: var(--surface-container-low); 
    height: 100vh; 
    padding: 80px 24px 24px 24px; 
    display: flex; 
    flex-direction: column; 
    z-index: 40; 
    border-right: 1px solid var(--outline-variant); 
}

.lab-header { 
    display: flex; 
    align-items: center; 
    gap: 12px; 
    margin-bottom: 32px; 
}

.icon-primary { 
    color: var(--primary); 
    background: var(--surface-container-high); 
    padding: 8px; 
    border-radius: 2px; 
}

.lab-header h2 { 
    font-size: 0.875rem; 
    font-weight: 900; 
    letter-spacing: 0.1em; 
}

.lab-header p { 
    font-size: 0.65rem; 
    color: var(--on-surface-variant); 
    text-transform: uppercase; 
    letter-spacing: 0.05em; 
}

.material-list { 
    display: flex; 
    flex-direction: column; 
    gap: 8px; 
    margin-bottom: 32px; 
}

.mat-item { 
    display: flex; 
    align-items: center; 
    gap: 12px; 
    padding: 12px; 
    font-size: 0.75rem; 
    color: var(--on-surface-variant); 
    border: 1px solid transparent; 
    cursor: pointer; 
}

.mat-item.active { 
    background: var(--surface-container-high); 
    color: var(--on-surface); 
    border: 1px solid var(--outline-variant); 
}

.component-selection { 
    margin-bottom: 32px; 
}

.component-selection label { 
    display: block; 
    font-size: 0.65rem; 
    text-transform: uppercase; 
    letter-spacing: 0.1em; 
    color: var(--on-surface-variant); 
    margin-bottom: 12px; 
}

.comp-item { 
    padding: 12px; 
    margin-bottom: 8px; 
    border: 1px solid var(--outline-variant); 
    background: var(--surface-container-lowest); 
    font-size: 0.75rem; 
}

.comp-item.active { 
    border-left: 2px solid var(--primary); 
    background: var(--surface-container-high); 
}

.comp-item p { 
    margin-bottom: 4px; 
    font-weight: 700; 
}

.comp-item span { 
    font-size: 0.65rem; 
    color: var(--on-surface-variant); 
}

.palette-section label { 
    display: block; 
    font-size: 0.65rem; 
    text-transform: uppercase; 
    letter-spacing: 0.1em; 
    color: var(--on-surface-variant); 
    margin-bottom: 16px; 
}

.palette-grid { 
    display: grid; 
    grid-template-columns: repeat(4, 1fr); 
    gap: 12px; 
}

.color-swatch { 
    aspect-ratio: 1; 
    border-radius: 50%; 
    cursor: pointer; 
    border: 1px solid var(--outline-variant); 
    transition: all 0.2s ease; 
}

.color-swatch:hover { 
    transform: scale(1.1); 
}

.color-swatch.active { 
    border: 2px solid var(--primary); 
    transform: scale(1.1); 
}

#car-viewport { 
    flex: 1; 
    position: relative; 
    background: radial-gradient(circle at center, #2a2a2a 0%, #131313 100%); 
}

#car-viewport canvas { 
    display: block; 
    width: 100%; 
    height: 100%; 
    outline: none; 
}

.hud-container { 
    position: absolute; 
    inset: 0; 
    pointer-events: none; 
    padding: 80px 40px; 
    display: flex; 
    justify-content: space-between; 
    z-index: 20; 
}

.stats-card { 
    background: rgba(32, 31, 31, 0.6); 
    backdrop-filter: blur(20px); 
    border: 1px solid var(--outline-variant); 
    padding: 24px; 
    min-width: 300px; 
    pointer-events: auto; 
}

.card-header { 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    margin-bottom: 24px; 
    border-bottom: 1px solid var(--outline-variant); 
    padding-bottom: 12px; 
}

.card-header h3 { 
    font-size: 0.75rem; 
    font-weight: 700; 
    letter-spacing: 0.1em; 
    color: var(--on-surface-variant); 
}

.stat-row { 
    display: flex; 
    justify-content: space-between; 
    align-items: baseline; 
    margin-bottom: 16px; 
}

.stat-label { 
    font-size: 0.65rem; 
    color: var(--on-surface-variant); 
    letter-spacing: 0.05em; 
}

.stat-value { 
    font-size: 1.5rem; 
    font-weight: 900; 
}

.stat-value small { 
    font-size: 0.75rem; 
    font-weight: 400; 
    color: var(--primary); 
}

.toggle-group { 
    display: flex; 
    border: 1px solid var(--outline-variant); 
}

.toggle-group span { 
    padding: 4px 12px; 
    font-size: 0.65rem; 
    font-weight: 700; 
}

.toggle-group span.active { 
    background: var(--primary); 
    color: var(--surface); 
}

.hud-desc { 
    font-size: 0.75rem; 
    color: var(--on-surface-variant); 
    line-height: 1.5; 
}

#rendering-overlay { 
    position: absolute; 
    inset: 0; 
    background: var(--surface); 
    display: flex; 
    flex-direction: column; 
    justify-content: center; 
    align-items: center; 
    z-index: 30; 
    transition: opacity 0.5s; 
}

#rendering-overlay.hidden { 
    opacity: 0; 
    pointer-events: none; 
}

.loader { 
    width: 40px; 
    height: 40px; 
    border: 2px solid var(--outline-variant); 
    border-top-color: var(--primary); 
    border-radius: 50%; 
    animation: spin 1s linear infinite; 
    margin-bottom: 16px; 
}

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

.bottom-bar { 
    position: absolute; 
    bottom: 0; 
    left: 320px; 
    right: 0; 
    height: 40px; 
    background: var(--surface-container-lowest); 
    border-top: 1px solid var(--outline-variant); 
    display: flex; 
    align-items: center; 
    padding: 0 24px; 
    gap: 32px; 
    z-index: 40; 
    font-family: monospace; 
    font-size: 0.65rem; 
    color: var(--on-surface-variant); 
}

#quiz-overlay {
    position: fixed; 
    inset: 0; 
    background: rgba(0,0,0,0.9);
    z-index: 1000; 
    display: flex; 
    justify-content: center; 
    align-items: center;
}

#quiz-overlay.hidden { 
    display: none; 
}

.quiz-card {
    background: var(--surface-container-low);
    padding: 40px; 
    border: 1px solid var(--outline-variant);
    text-align: center; 
    max-width: 400px;
}

#start-configurator {
    width: 100%; 
    padding: 16px; 
    background: var(--primary); 
    color: var(--surface);
    border: none; 
    font-weight: 900; 
    cursor: pointer; 
    letter-spacing: 0.05em;
}

#start-configurator:disabled { 
    opacity: 0.3; 
    cursor: not-allowed; 
}

.quiz-opt { 
    aspect-ratio: 1; 
    border-radius: 50%; 
    cursor: pointer; 
    border: 2px solid transparent; 
    transition: 0.2s;
}

.quiz-opt.selected { 
    border-color: var(--primary); 
    transform: scale(1.1); 
}

.data-disclaimer {
    font-size: 0.65rem;
    color: var(--on-surface-variant); 
    opacity: 0.7;
    margin-top: -10px;
    margin-bottom: 15px;
    font-style: italic;
    letter-spacing: 0.5px;
}

@media (max-width: 850px) {
    body {
        flex-direction: column !important;
        height: auto !important;
        min-height: 100vh !important;
        overflow-x: hidden !important;
        overflow-y: auto !important;
    }

    header {
        position: relative !important;
        padding: 0 16px !important;
        height: 60px !important;
        background: var(--surface-container-lowest) !important;
        order: 0 !important;
    }
    
    .logo { 
        margin-right: 15px !important; 
        font-size: 1rem !important; 
    }
    
    nav, .header-icons { 
        display: none !important; 
    }

    #car-viewport {
        width: 100% !important;
        height: 55vh !important;
        order: 1 !important;
        position: relative !important;
        flex: none !important; 
    }

    #car-viewport canvas {
        width: 100% !important;
        height: 100% !important;
        outline: none !important;
    }

    #paint-lab {
        width: 100% !important;
        height: auto !important;
        padding: 24px !important;
        order: 2 !important;
        border-right: none !important;
        border-top: 1px solid var(--outline-variant) !important;
        flex: none !important; 
    }

    .bottom-bar {
        position: relative !important;
        bottom: auto !important;
        left: auto !important;
        width: 100% !important;
        height: auto !important;
        padding: 16px !important;
        order: 3 !important;
        flex-direction: column !important;
        gap: 8px !important;
        text-align: center !important;
    }
    
    .bottom-bar span { 
        margin-left: 0 !important; 
    }

    .hud-container {
        padding: 12px !important;
        flex-direction: column !important;
        pointer-events: none !important;
        position: absolute !important;
        top: 0 !important;
        left: 0 !important;
        width: 100% !important;
        bottom: auto !important;
    }

    .stats-card {
        min-width: unset !important;
        width: max-content !important; 
        max-width: 55% !important;
        padding: 10px 14px !important;
        background: rgba(19, 19, 19, 0.4) !important;
        border: none !important;
        backdrop-filter: none !important;
    }
    
    .stats-card.top-right {
        display: none !important;
    }

    .card-header {
        margin-bottom: 8px !important;
        padding-bottom: 6px !important;
    }

    .card-header h3 {
        font-size: 0.65rem !important;
    }

    .stat-row { 
        margin-bottom: 6px !important; 
        gap: 16px !important;
    }

    .stat-label { 
        font-size: 0.55rem !important; 
    }
    
    .stat-value { 
        font-size: 0.95rem !important; 
    }

    .quiz-card {
        width: 90% !important;
        padding: 24px !important;
    }
    
    #color-palette {
        display: flex !important;
        gap: 16px !important;
        flex-wrap: wrap !important;
    }

    #color-palette .color-swatch {
        width: 40px !important;
        height: 40px !important;
        flex-shrink: 0 !important;
    }
}

@media (max-width: 480px) {
    .stats-card {
        max-width: 65% !important;
    }

    .stat-label { 
        font-size: 0.5rem !important; 
    }
    
    .stat-value { 
        font-size: 0.85rem !important; 
    }

    #color-palette .color-swatch {
        width: 36px !important;
        height: 36px !important;
    }
}