* {
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body {
    -webkit-text-size-adjust: 100%;
    touch-action: manipulation;
}

.motorex-calculator {
    max-width: 900px;
    margin: 0 auto;
    padding: 15px;
    font-family: Arial, sans-serif;
}

/* Horizontal Layout Specific Styles */
.motorex-calculator-horizontal {
    max-width: 1000px;
    container-type: inline-size;
}

.performance-guide-horizontal h2 {
    margin: 0 0 12px 0;
    font-size: 22px;
    text-align: center;
}

.horizontal-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    align-items: center;
}

/* Container query for narrow columns - triggers when container is less than 600px wide */
@container (max-width: 600px) {
    .horizontal-content {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .slider-section {
        padding-right: 0 !important;
    }
    
    .results-section {
        padding-left: 0 !important;
        border-left: none !important;
        border-top: 2px solid #e0e0e0;
        padding-top: 20px;
    }
}

/* Fallback media query for browsers without container query support */
@media (max-width: 1200px) {
    .motorex-calculator-horizontal .horizontal-content {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .motorex-calculator-horizontal .slider-section {
        padding-right: 0;
    }
    
    .motorex-calculator-horizontal .results-section {
        padding-left: 0;
        border-left: none;
        border-top: 2px solid #e0e0e0;
        padding-top: 20px;
    }
}

.slider-section {
    padding-right: 15px;
}

.horizontal-content .slider-value {
    margin-top: -5px;
    font-size: 32px;
    margin-bottom: 10px;
}

.horizontal-content .slider-ticks {
    font-size: 11px;
}

.results-section {
    padding-left: 15px;
    border-left: 2px solid #e0e0e0;
}

.results-section .results-header {
    margin-bottom: 10px;
    padding: 0;
}

.results-section .results-header span {
    font-size: 12px;
}

.results-section .results-items {
    padding: 0;
    gap: 8px;
}

.results-section .result-item {
    padding: 12px 15px;
    gap: 10px;
}

.results-section .fuel-value,
.results-section .oil-value {
    font-size: 18px;
}

/* Product Cards */
.oil-products {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
    margin-top: 20px;
}

.product-card {
    background: white;
    border: 3px solid #e0e0e0;
    border-radius: 10px;
    padding: 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    text-decoration: none;
    display: block;
    color: inherit;
}

.product-card:hover {
    border-color: #009989;
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 153, 137, 0.2);
    text-decoration: none;
}

.product-card.selected {
    border-color: #009989;
    background: linear-gradient(135deg, #e6f7f6 0%, #fff 100%);
    box-shadow: 0 5px 15px rgba(0, 153, 137, 0.3);
}

.product-card.selected::after {
    content: "✓";
    position: absolute;
    top: 10px;
    right: 10px;
    background: #009989;
    color: white;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: bold;
}

.product-image {
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 15px;
}

.product-image img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.product-info h3 {
    color: #333;
    font-size: 18px;
    margin-bottom: 8px;
    font-weight: bold;
}

.product-type {
    color: #009989;
    font-size: 14px;
    font-weight: bold;
    margin-bottom: 5px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.product-description {
    color: #666;
    font-size: 13px;
    margin: 0;
}

/* Performance Guide (Vertical Layout) */
.performance-guide {
    background: linear-gradient(135deg, #f8f8f8 0%, #fff 100%);
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 15px;
}

.performance-guide h2 {
    color: #000;
    margin-bottom: 15px;
    margin-top: 15px;
    text-align: center;
    font-size: 26px;
    font-weight: bold;
}

.note-top {
    text-align: center;
    color: #666;
    font-size: 14px;
    font-style: normal;
    margin-bottom: 15px;
    line-height: 1.5;
}

.oil-scale {
    margin: 15px 0;
}

.slider-container {
    padding: 0 12px;
    position: relative;
}

.slider-labels-overlay {
    position: absolute;
    top: 0;
    left: 12px;
    right: 12px;
    height: 27px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    pointer-events: none;
    z-index: 1;
    padding: 0 15px;
}

.slider-label-left,
.slider-label-right {
    font-size: 10px;
    font-weight: bold;
    color: white;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.ratio-slider {
    -webkit-appearance: none;
    width: 100%;
    height: 24px;
    border-radius: 9px;
    background: #009989;
    outline: none;
    box-shadow: 0 2px 6px rgba(0,0,0,0.15);
}

.ratio-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: #009989;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
    transition: transform 0.2s;
    border: 3px solid white;
}

.ratio-slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.ratio-slider::-moz-range-thumb {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: #009989;
    cursor: pointer;
    border: 3px solid white;
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
    transition: transform 0.2s;
}

.ratio-slider::-moz-range-thumb:hover {
    transform: scale(1.1);
}

.slider-value {
    text-align: center;
    margin-top: -10px;
    font-size: 28px;
    font-weight: bold;
    color: #009989;
}

.slider-ticks {
    display: flex;
    justify-content: space-between;
    margin-top: 3px;
    padding: 0 20px;
    font-size: 12px;
    color: #999;
}

/* Results Grid (Vertical Layout) */
.results-grid {
    margin: 20px 0;
}

.results-header {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-bottom: 12px;
    padding: 0 5px;
}

.results-header span {
    font-weight: bold;
    font-size: 14px;
    color: #000;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    text-align: center;
}

.results-items {
    display: grid;
    gap: 10px;
    padding: 0px 30px 30px;
}

.result-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    background: white;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    padding: 18px 20px;
    transition: all 0.2s ease;
    text-align: center;
}

.result-item:hover {
    border-color: #009989;
    box-shadow: 0 2px 8px rgba(0, 153, 137, 0.15);
    transform: translateY(-1px);
}

.fuel-value,
.oil-value {
    font-size: 20px;
    font-weight: bold;
    color: #333;
}

.oil-value {
    color: #009989;
}

.performance-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-top: 12px;
}

.performance-card {
    background: white;
    border: 2px solid #e0e0e0;
    border-radius: 6px;
    padding: 15px;
    text-align: center;
}

.performance-card h4 {
    margin-bottom: 6px;
    font-size: 14px;
    color: #009989;
}

.performance-card ul {
    list-style: none;
    padding: 0;
    margin: 0;
    text-align: left;
}

.performance-card li {
    padding: 0px;
    font-size: 14px;
    color: #666;
    line-height: 1.2;
}

.performance-card li:before {
    content: "• ";
    color: #009989;
    font-weight: bold;
}

/* Tablet Responsive */
@media (max-width: 768px) {
    .motorex-calculator {
        padding: 10px;
    }
    
    /* Horizontal layout becomes vertical on tablet */
    .horizontal-content {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .slider-section {
        padding-right: 0;
    }
    
    .results-section {
        padding-left: 0;
        border-left: none;
        border-top: 2px solid #e0e0e0;
        padding-top: 20px;
    }
    
    .product-card {
        padding: 15px;
    }
    
    .product-image {
        height: 180px;
    }
    
    .product-info h3 {
        font-size: 16px;
    }
    
    .performance-guide {
        padding: 12px;
    }
    
    .slider-container {
        padding: 0 10px;
    }
    
    .results-header span {
        font-size: 12px;
    }
    
    .result-item {
        padding: 15px 18px;
    }
    
    .fuel-value,
    .oil-value {
        font-size: 18px;
    }
    
    .performance-grid {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .performance-card {
        padding: 10px;
    }
    
    .performance-card h4 {
        font-size: 13px;
        margin-bottom: 6px;
    }
    
    .performance-card li {
        font-size: 14px;
        padding: 0px 0;
    }
}

/* Mobile Responsive */
@media (max-width: 480px) {
    .motorex-calculator {
        padding: 8px;
    }
    
    .performance-guide {
        padding: 10px;
    }
    
    .oil-scale {
        margin: 10px 0;
    }
    
    .results-grid {
        margin: 15px 0;
    }
    
    .results-header span {
        font-size: 11px;
    }
    
    .result-item {
        padding: 12px 15px;
        gap: 10px;
    }
    
    .fuel-value,
    .oil-value {
        font-size: 16px;
    }
    
    .performance-card {
        padding: 8px;
    }
    
    .performance-card h4 {
        font-size: 12px;
    }
    
    .performance-card li {
        font-size: 10px;
    }
}