body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f5f5f5;
}

.navbar {
    background-color: #2c3e50;
    padding: 1rem 0;
}

.nav-container {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    max-width: 1200px;
    margin: 0 auto;
}

.nav-item {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    margin: 0 0.5rem;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.nav-item:hover {
    background-color: #34495e;
}

.nav-item.active {
    background-color: #3498db;
}

.chart-container {
    width: 60%;
    margin: 1rem auto;
    background-color: white;
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.data-table {
    width: 80%;
    margin: 2rem auto;
    background-color: white;
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.data-table table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th, .data-table td {
    border: 1px solid #ddd;
    padding: 8px;
    text-align: left;
}

.data-table th {
    background-color: #f2f2f2;
}

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

.data-table input {
    width: 100%;
    padding: 5px;
    box-sizing: border-box;
}

.save-btn {
    margin-top: 1rem;
    padding: 0.5rem 1rem;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
}

.save-btn:hover {
    background-color: #45a049;
}