body {
    font-family: 'Georgia', serif;
    margin: 0;
    padding: 20px;
    background-color: #f5f1e8;
    color: #5d4e37;
}

.title {
    text-align: center;
    font-size: 28px;
    font-weight: bold;
    letter-spacing: 2px;
    margin-bottom: 30px;
    color: #5d4e37;
}

.input-container {
    display: flex;
    justify-content: center;
    margin-bottom: 40px;
}

.input-box {
    background-color: #ede4d3;
    border: 2px solid #d4c4a8;
    border-radius: 15px;
    padding: 15px 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.function-label {
    font-size: 18px;
    font-style: italic;
    color: #5d4e37;
    margin-right: 5px;
}

.equation-input {
    background-color: #f8f5f0;
    border: 1px solid #d4c4a8;
    border-radius: 8px;
    padding: 8px 12px;
    font-size: 16px;
    font-family: 'Courier New', monospace;
    color: #5d4e37;
    min-width: 400px;
    text-align: center;
}

.equation-input:focus {
    outline: none;
    border-color: #b8a082;
    box-shadow: 0 0 5px rgba(184, 160, 130, 0.3);
}

.plot-button {
    background-color: #d4c4a8;
    border: 1px solid #b8a082;
    border-radius: 8px;
    padding: 8px 16px;
    font-size: 16px;
    color: #5d4e37;
    cursor: pointer;
    transition: background-color 0.2s;
}

.plot-button:hover {
    background-color: #c4b49a;
}

/* Main chart area layout */
.chart-area {
    display: flex;
    flex-direction: column;
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
}

.chart-container {
    background-color: #ffffff;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    border: 1px solid #e0d5c7;
}

/* Side-by-side layout (default) */
.chart-container.side-by-side-layout {
    display: flex;
    align-items: flex-start;
    gap: 20px;
}

.side-by-side-layout .equation-left {
    flex: 1;
    min-width: 0;
    max-width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.side-by-side-layout .chart-center {
    flex-shrink: 0;
}

/* Stacked layout (equation above chart) */
.chart-container.stacked-layout {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.stacked-layout .equation-left {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.stacked-layout .chart-center {
    align-self: center;
}

/* Default layout (fallback to side-by-side) */
.chart-container:not(.side-by-side-layout):not(.stacked-layout) {
    display: flex;
    align-items: flex-start;
    gap: 20px;
}

.chart-container:not(.side-by-side-layout):not(.stacked-layout) .equation-left {
    flex: 1;
    min-width: 0;
    max-width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.chart-container:not(.side-by-side-layout):not(.stacked-layout) .chart-center {
    flex-shrink: 0;
}

.chart-center svg {
    display: block;
}

/* Chart styling */
.axis path,
.axis line {
    fill: none;
    stroke: #5d4e37;
    stroke-width: 1.5px;
    shape-rendering: crispEdges;
}

.axis text {
    fill: #5d4e37;
    font-size: 12px;
    font-family: 'Georgia', serif;
}

.line {
    fill: none;
    stroke: #2c5aa0;
    stroke-width: 3px;
    filter: drop-shadow(0 1px 2px rgba(0,0,0,0.1));
}

.hover-circle,
.deriv-circle {
    pointer-events: none;
    stroke-width: 2px;
    filter: drop-shadow(0 1px 3px rgba(0,0,0,0.2));
}

.tangent-line {
    stroke-width: 2px;
    pointer-events: none;
    stroke-dasharray: 5,5;
    opacity: 0.8;
}

.slope-text,
.deriv-text {
    font-size: 13px;
    font-weight: bold;
    pointer-events: none;
    font-family: 'Georgia', serif;
    text-shadow: 1px 1px 2px rgba(255,255,255,0.8);
}

/* Responsive design */
@media (max-width: 768px) {
    .chart-container.side-by-side-layout {
        flex-direction: column;
        align-items: stretch;
    }
    
    .side-by-side-layout .equation-left {
        margin-bottom: 15px;
    }
    
    .chart-center svg {
        width: 100%;
        height: auto;
    }
    
    body {
        padding: 10px;
    }
}

/* MathJax container styling */
.equation-left mjx-container {
    width: 100% !important;
    max-width: 100% !important;
    text-align: center !important;
}

.equation-left mjx-math {
    color: #5d4e37 !important;
    max-width: 100% !important;
}