body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: linear-gradient(135deg, #e0eafc, #cfdef3);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: #333;
    position: relative;
}

header {
    background-color: #2c3e50;
    color: white;
    padding: 1rem;
    text-align: center;
    position: relative;
}

header h1 {
    margin: 0;
    font-size: 2rem;
}

nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: #34495e;
}

.nav-links {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
}

.nav-links li {
    margin: 0 1rem;
}

.nav-links li a {
    color: white;
    text-decoration: none;
    font-size: 1.1rem;
}

.burger {
    font-size: 1.5rem;
    cursor: pointer;
    display: block;
    text-align: right;
    padding: 0.5rem;
}

.burger.active + .nav-links {
    display: flex;
    flex-direction: column;
}

.container {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem 1rem;
    position: relative;
}

.leaderboard {
    background-color: rgba(255, 255, 255, 0.8);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 600px;
    text-align: center;
    position: relative;
    z-index: 1;
}

.leaderboard h2 {
    color: #2c3e50;
    margin-bottom: 1.5rem;
    position: relative;
    z-index: 1;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

th, td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

th {
    background-color: #34495e;
    color: white;
}

td {
    background-color: #fff;
}

#message {
    margin-top: 1rem;
    color: #e74c3c;
    position: relative;
    z-index: 1;
}

footer {
    background-color: #2c3e50;
    color: white;
    text-align: center;
    padding: 1rem;
    margin-top: auto;
}

@media (min-width: 768px) {
    .burger {
        display: none;
    }
    nav {
        display: block;
        position: static;
        background: none;
    }
    .nav-links {
        flex-direction: row;
    }
    .leaderboard {
        padding: 2.5rem;
    }
}

@media (max-width: 767px) {
    .leaderboard {
        padding: 1.5rem;
    }
    th, td {
        padding: 0.5rem;
    }
}