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

body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

h1 {
    text-align: center;
    color: white;
    margin-bottom: 30px;
    font-size: 2.5em;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.calculator-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 30px;
}

.card {
    background: white;
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
}

.card h2 {
    color: #4a5568;
    margin-bottom: 20px;
    font-size: 1.5em;
    border-bottom: 2px solid #e67e22;
    padding-bottom: 10px;
}

.input-group {
    margin-bottom: 15px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
    color: #4a5568;
}

input {
    width: 100%;
    padding: 10px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s ease;
}

input:focus {
    outline: none;
    border-color: #e67e22;
}

.slider {
    width: 100%;
    height: 8px;
    border-radius: 5px;
    background: #d3d3d3;
    outline: none;
    opacity: 0.7;
    transition: opacity 0.2s;
}

.slider:hover {
    opacity: 1;
}

.slider::-webkit-slider-thumb {
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #e67e22;
    cursor: pointer;
}

.slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #e67e22;
    cursor: pointer;
    border: none;
}

.results {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-top: 20px;
}

.result-item {
    background: #f7fafc;
    padding: 15px;
    border-radius: 8px;
    border-left: 4px solid #e67e22;
}

.result-label {
    font-weight: bold;
    color: #4a5568;
    margin-bottom: 5px;
}

.result-value {
    font-size: 1.2em;
    color: #2d3748;
    font-weight: bold;
}

.visualization-section {
    margin-top: 30px;
}

.greeks-container {
    background: white;
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    margin-bottom: 30px;
}

.chart-container {
    height: 400px;
    margin-top: 20px;
}

.heatmap-section {
    background: white;
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    overflow: visible;
}

.heatmap-controls {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr;
    gap: 15px;
    margin-bottom: 20px;
}

.heatmap-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-top: 20px;
    justify-items: center;
}

.heatmap-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    max-width: 600px;
    overflow: visible;
}

.heatmap-with-legend {
    display: flex;
    align-items: center;
    gap: 20px;
}

.heatmap-canvas-container {
    position: relative;
    margin-bottom: 80px;
    margin-left: 110px;
}

.axis-label {
    position: absolute;
    font-size: 12px;
    font-weight: bold;
    color: #4a5568;
}

.axis-label.x-axis {
    bottom: -65px;
    left: 50%;
    transform: translateX(-50%);
}

.axis-label.y-axis {
    left: -95px;
    top: 50%;
    transform: translateY(-50%) rotate(-90deg);
}

.axis-ticks {
    position: absolute;
    font-size: 12px;
    color: #666;
    font-weight: bold;
}

.axis-ticks.x-axis {
    bottom: -15px;
    width: 99%;
    display: flex;
    justify-content: space-between;
    left: 0;
}

.axis-ticks.y-axis {
    left: -30px;
    height: 98%;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: flex-end;
    top: 0;
}

.legend-vertical {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.legend-bar-vertical {
    width: 20px;
    height: 350px;
    background: linear-gradient(to top, #ff4444, #ff8844, #ffaa44, #88ff44, #44ff44);
    border-radius: 5px;
}

.heatmap-canvas {
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    cursor: crosshair;
}

.heatmap-legend {
    display: flex;
    justify-content: center;
    margin-top: 10px;
    align-items: center;
}

.legend-bar {
    width: 300px;
    height: 20px;
    background: linear-gradient(to right, #ff4444, #ff8844, #ffaa44, #88ff44, #44ff44);
    border-radius: 5px;
    margin: 0 10px;
}

.tooltip {
    position: absolute;
    background: rgba(0,0,0,0.8);
    color: white;
    padding: 8px;
    border-radius: 5px;
    font-size: 12px;
    pointer-events: none;
    z-index: 1000;
}

@media (max-width: 768px) {
    .calculator-grid {
        grid-template-columns: 1fr;
    }
    
    .heatmap-controls {
        grid-template-columns: 1fr 1fr;
    }
    
    .heatmap-container {
        grid-template-columns: 1fr;
    }
    
    .heatmap-item {
        max-width: 100%;
    }
    
    .heatmap-canvas-container {
        margin-left: 80px;
        margin-bottom: 70px;
    }
    
    .heatmap-item h3 {
        margin-left: 40px !important;
        width: 500px !important;
    }
    
    .heatmap-with-legend {
        flex-direction: column;
        gap: 10px;
    }
    
    .legend-vertical {
        flex-direction: row;
        gap: 10px;
        margin-top: 0;
    }
    
    .legend-bar-vertical {
        width: 200px;
        height: 20px;
        background: linear-gradient(to right, #ff4444, #ff8844, #ffaa44, #88ff44, #44ff44);
    }
    
    .axis-label.y-axis {
        left: -75px;
    }
    
    .axis-ticks.y-axis {
        left: -60px;
    }
}