body {
    background-color: #1e1e1e;
    color: #e0e0e0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
}
.header {
    background-color: #2d2d2d;
    padding: 30px;
    text-align: center;
    border-bottom: 5px solid #4CAF50;
}
h1 { color: #4CAF50; margin-bottom: 20px; }
select {
    padding: 10px;
    background: #3d3d3d;
    color: white;
    border: 2px solid #4CAF50;
    border-radius: 5px;
    font-size: 16px;
}
.container { padding: 20px; }
table {
    width: 90%;
    max-width: 800px;
    margin: 0 auto;
    border-collapse: collapse;
    background: #252525;
}
th, td { padding: 15px; border: 1px solid #333; text-align: left; }
th { background: #333; color: #4CAF50; }
tr:hover { background: #2d2d2d; }
.gold { color: #FFD700; font-weight: bold; }
.silver { color: #C0C0C0; }
.bronze { color: #CD7F32; }

/* Navigation Bar Styling */
.navbar {
    background-color: #252525;
    padding: 10px;
    text-align: center;
    border-bottom: 2px solid #444;
    margin-bottom: 20px;
}

.nav-btn {
    display: inline-block;
    padding: 10px 20px;
    margin: 0 10px;
    background-color: #3d3d3d;
    color: #e0e0e0;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    transition: background 0.3s;
    border: 1px solid #4CAF50;
}

.nav-btn:hover {
    background-color: #4CAF50;
    color: white;
}

.nav-btn.active {
    background-color: #4CAF50;
    color: white;
}