body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background: #f4f4f4;
    color: #333;
}

header {
    background: #333;
    color: #fff;
    padding: 1rem 0;
    text-align: center;
}

header h1 {
    margin: 0;
}

.language-selector {
    position: absolute;
    top: 1rem;
    right: 1rem;
}

.language-selector button {
    background-color: #007bff;
    color: white;
    border: none;
    padding: 8px 12px;
    margin-left: 5px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.9em;
    transition: background-color 0.3s ease;
}

.language-selector button:hover {
    background-color: #0056b3;
}

.language-selector button.active {
    background-color: #0056b3;
    font-weight: bold;
}

main {
    padding: 20px;
    max-width: 900px;
    margin: auto;
    background: #fff;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

section {
    margin-bottom: 20px;
    padding: 15px;
    border-bottom: 1px solid #eee;
}

section:last-of-type {
    border-bottom: none;
}

h2, h3, h4 {
    color: #333;
    border-bottom: 2px solid #007bff;
    padding-bottom: 5px;
    margin-top: 20px;
}

ul {
    list-style: none;
    padding: 0;
}

ul li {
    background: #e9ecef;
    margin-bottom: 10px;
    padding: 10px 15px;
    border-radius: 5px;
}

ul li strong {
    color: #0056b3;
}

.chart-placeholder {
    display: block;
    max-width: 100%;
    height: auto;
    margin: 10px 0;
    background-color: #f0f0f0;
    border: 1px dashed #ccc;
    padding: 20px;
    text-align: center;
    font-style: italic;
    color: #666;
}

footer {
    text-align: center;
    padding: 20px;
    background: #333;
    color: #fff;
    margin-top: 20px;
}