body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #f9f9f9;
    color: #333;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 20px auto;
    padding: 20px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

header {
    text-align: center;
    margin-bottom: 20px;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

header p {
    font-size: 1.2rem;
    color: #555;
}

.step-guide .step {
    margin-bottom: 20px;
}

.step h2 {
    font-size: 1.5rem;
    color: #333;
    margin-bottom: 10px;
}

.step ol {
    padding-left: 20px;
}

.chart-container {
    overflow-x: auto;
    margin: 20px 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
}

table th, table td {
    padding: 10px;
    text-align: center;
    border: 1px solid #ddd;
}

table th {
    background-color: #f4f4f4;
    color: #333;
}

table tr:nth-child(even) {
    background-color: #f9f9f9;
}

table tr:hover {
    background-color: #f1f1f1;
}

.interactive-tool {
    margin-top: 40px;
}

.hidden {
    display: none;
}

footer {
    text-align: center;
    margin-top: 40px;
    font-size: 0.9rem;
    color: #666;
}

#foot-length {
    width: 100%;
    margin: 15px 0;
}

#result p {
    font-size: 1.2rem;
    color: #28a745;
}