body {
    margin: 0;
    font-family: 'Inter', sans-serif;
    background: #f7f7f7;
    color: #333;
}

header {
    background: #2d4a72;
    padding: 20px;
    text-align: center;
    color: white;
}

nav a {
    margin: 0 15px;
    color: #e0e6ed;
    text-decoration: none;
    font-weight: bold;
}

nav a:hover {
    color: #ffffff;
}

.subtitle {
    font-size: 1.2rem;
    margin-top: -10px;
}

.content {
    max-width: 900px;
    margin: 40px auto;
    padding: 10px;
}

.chart {
    width: 100%;
    margin: 20px 0;
    border-radius: 6px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.btn {
    display: inline-block;
    padding: 12px 20px;
    background: #2d4a72;
    color: white;
    text-decoration: none;
    border-radius: 6px;
    margin-top: 20px;
}

footer {
    text-align: center;
    padding: 20px 0;
    background: #2d4a72;
    color: white;
    margin-top: 40px;
}